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linux/fs/nfsd/nfs4state.c
Dai Ngo 1d3dd1d56c NFSD: Enable write delegation support 
This patch grants write delegations for OPEN with NFS4_SHARE_ACCESS_WRITE
if there is no conflict with other OPENs.

Write delegation conflicts with another OPEN, REMOVE, RENAME and SETATTR
are handled the same as read delegation using notify_change,
try_break_deleg.

The NFSv4.0 protocol does not enable a server to determine that a
conflicting GETATTR originated from the client holding the
delegation versus coming from some other client. With NFSv4.1 and
later, the SEQUENCE operation that begins each COMPOUND contains a
client ID, so delegation recall can be safely squelched in this case.

With NFSv4.0, however, the server must recall or send a CB_GETATTR
(per RFC 7530 Section 16.7.5) even when the GETATTR originates from
the client holding that delegation.

An NFSv4.0 client can trigger a pathological situation if it always
sends a DELEGRETURN preceded by a conflicting GETATTR in the same
COMPOUND. COMPOUND execution will always stop at the GETATTR and the
DELEGRETURN will never get executed. The server eventually revokes
the delegation, which can result in loss of open or lock state.

Tracepoint added to track whether read or write delegation is granted.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2023-08-29 17:45:22 -04:00

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/*
* Copyright (c) 2001 The Regents of the University of Michigan.
* All rights reserved.
*
* Kendrick Smith <kmsmith@umich.edu>
* Andy Adamson <kandros@umich.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/ratelimit.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/addr.h>
#include <linux/jhash.h>
#include <linux/string_helpers.h>
#include <linux/fsnotify.h>
#include <linux/rhashtable.h>
#include <linux/nfs_ssc.h>
#include "xdr4.h"
#include "xdr4cb.h"
#include "vfs.h"
#include "current_stateid.h"
#include "netns.h"
#include "pnfs.h"
#include "filecache.h"
#include "trace.h"
#define NFSDDBG_FACILITY NFSDDBG_PROC
#define all_ones {{~0,~0},~0}
static const stateid_t one_stateid = {
.si_generation = ~0,
.si_opaque = all_ones,
};
static const stateid_t zero_stateid = {
/* all fields zero */
};
static const stateid_t currentstateid = {
.si_generation = 1,
};
static const stateid_t close_stateid = {
.si_generation = 0xffffffffU,
};
static u64 current_sessionid = 1;
#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
#define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
#define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
#define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
/* forward declarations */
static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
void nfsd4_end_grace(struct nfsd_net *nn);
static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
static void nfsd4_file_hash_remove(struct nfs4_file *fi);
/* Locking: */
/*
* Currently used for the del_recall_lru and file hash table. In an
* effort to decrease the scope of the client_mutex, this spinlock may
* eventually cover more:
*/
static DEFINE_SPINLOCK(state_lock);
enum nfsd4_st_mutex_lock_subclass {
OPEN_STATEID_MUTEX = 0,
LOCK_STATEID_MUTEX = 1,
};
/*
* A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
* the refcount on the open stateid to drop.
*/
static DECLARE_WAIT_QUEUE_HEAD(close_wq);
/*
* A waitqueue where a writer to clients/#/ctl destroying a client can
* wait for cl_rpc_users to drop to 0 and then for the client to be
* unhashed.
*/
static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
static struct kmem_cache *client_slab;
static struct kmem_cache *openowner_slab;
static struct kmem_cache *lockowner_slab;
static struct kmem_cache *file_slab;
static struct kmem_cache *stateid_slab;
static struct kmem_cache *deleg_slab;
static struct kmem_cache *odstate_slab;
static void free_session(struct nfsd4_session *);
static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
static struct workqueue_struct *laundry_wq;
int nfsd4_create_laundry_wq(void)
{
int rc = 0;
laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
if (laundry_wq == NULL)
rc = -ENOMEM;
return rc;
}
void nfsd4_destroy_laundry_wq(void)
{
destroy_workqueue(laundry_wq);
}
static bool is_session_dead(struct nfsd4_session *ses)
{
return ses->se_flags & NFS4_SESSION_DEAD;
}
static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
{
if (atomic_read(&ses->se_ref) > ref_held_by_me)
return nfserr_jukebox;
ses->se_flags |= NFS4_SESSION_DEAD;
return nfs_ok;
}
static bool is_client_expired(struct nfs4_client *clp)
{
return clp->cl_time == 0;
}
static void nfsd4_dec_courtesy_client_count(struct nfsd_net *nn,
struct nfs4_client *clp)
{
if (clp->cl_state != NFSD4_ACTIVE)
atomic_add_unless(&nn->nfsd_courtesy_clients, -1, 0);
}
static __be32 get_client_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
if (is_client_expired(clp))
return nfserr_expired;
atomic_inc(&clp->cl_rpc_users);
nfsd4_dec_courtesy_client_count(nn, clp);
clp->cl_state = NFSD4_ACTIVE;
return nfs_ok;
}
/* must be called under the client_lock */
static inline void
renew_client_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
if (is_client_expired(clp)) {
WARN_ON(1);
printk("%s: client (clientid %08x/%08x) already expired\n",
__func__,
clp->cl_clientid.cl_boot,
clp->cl_clientid.cl_id);
return;
}
list_move_tail(&clp->cl_lru, &nn->client_lru);
clp->cl_time = ktime_get_boottime_seconds();
nfsd4_dec_courtesy_client_count(nn, clp);
clp->cl_state = NFSD4_ACTIVE;
}
static void put_client_renew_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
if (!atomic_dec_and_test(&clp->cl_rpc_users))
return;
if (!is_client_expired(clp))
renew_client_locked(clp);
else
wake_up_all(&expiry_wq);
}
static void put_client_renew(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
return;
if (!is_client_expired(clp))
renew_client_locked(clp);
else
wake_up_all(&expiry_wq);
spin_unlock(&nn->client_lock);
}
static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
{
__be32 status;
if (is_session_dead(ses))
return nfserr_badsession;
status = get_client_locked(ses->se_client);
if (status)
return status;
atomic_inc(&ses->se_ref);
return nfs_ok;
}
static void nfsd4_put_session_locked(struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
free_session(ses);
put_client_renew_locked(clp);
}
static void nfsd4_put_session(struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
spin_lock(&nn->client_lock);
nfsd4_put_session_locked(ses);
spin_unlock(&nn->client_lock);
}
static struct nfsd4_blocked_lock *
find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
struct nfsd_net *nn)
{
struct nfsd4_blocked_lock *cur, *found = NULL;
spin_lock(&nn->blocked_locks_lock);
list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
if (fh_match(fh, &cur->nbl_fh)) {
list_del_init(&cur->nbl_list);
WARN_ON(list_empty(&cur->nbl_lru));
list_del_init(&cur->nbl_lru);
found = cur;
break;
}
}
spin_unlock(&nn->blocked_locks_lock);
if (found)
locks_delete_block(&found->nbl_lock);
return found;
}
static struct nfsd4_blocked_lock *
find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
struct nfsd_net *nn)
{
struct nfsd4_blocked_lock *nbl;
nbl = find_blocked_lock(lo, fh, nn);
if (!nbl) {
nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
if (nbl) {
INIT_LIST_HEAD(&nbl->nbl_list);
INIT_LIST_HEAD(&nbl->nbl_lru);
fh_copy_shallow(&nbl->nbl_fh, fh);
locks_init_lock(&nbl->nbl_lock);
kref_init(&nbl->nbl_kref);
nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
&nfsd4_cb_notify_lock_ops,
NFSPROC4_CLNT_CB_NOTIFY_LOCK);
}
}
return nbl;
}
static void
free_nbl(struct kref *kref)
{
struct nfsd4_blocked_lock *nbl;
nbl = container_of(kref, struct nfsd4_blocked_lock, nbl_kref);
kfree(nbl);
}
static void
free_blocked_lock(struct nfsd4_blocked_lock *nbl)
{
locks_delete_block(&nbl->nbl_lock);
locks_release_private(&nbl->nbl_lock);
kref_put(&nbl->nbl_kref, free_nbl);
}
static void
remove_blocked_locks(struct nfs4_lockowner *lo)
{
struct nfs4_client *clp = lo->lo_owner.so_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
struct nfsd4_blocked_lock *nbl;
LIST_HEAD(reaplist);
/* Dequeue all blocked locks */
spin_lock(&nn->blocked_locks_lock);
while (!list_empty(&lo->lo_blocked)) {
nbl = list_first_entry(&lo->lo_blocked,
struct nfsd4_blocked_lock,
nbl_list);
list_del_init(&nbl->nbl_list);
WARN_ON(list_empty(&nbl->nbl_lru));
list_move(&nbl->nbl_lru, &reaplist);
}
spin_unlock(&nn->blocked_locks_lock);
/* Now free them */
while (!list_empty(&reaplist)) {
nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
nbl_lru);
list_del_init(&nbl->nbl_lru);
free_blocked_lock(nbl);
}
}
static void
nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
{
struct nfsd4_blocked_lock *nbl = container_of(cb,
struct nfsd4_blocked_lock, nbl_cb);
locks_delete_block(&nbl->nbl_lock);
}
static int
nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
{
trace_nfsd_cb_notify_lock_done(&zero_stateid, task);
/*
* Since this is just an optimization, we don't try very hard if it
* turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
* just quit trying on anything else.
*/
switch (task->tk_status) {
case -NFS4ERR_DELAY:
rpc_delay(task, 1 * HZ);
return 0;
default:
return 1;
}
}
static void
nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
{
struct nfsd4_blocked_lock *nbl = container_of(cb,
struct nfsd4_blocked_lock, nbl_cb);
free_blocked_lock(nbl);
}
static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
.prepare = nfsd4_cb_notify_lock_prepare,
.done = nfsd4_cb_notify_lock_done,
.release = nfsd4_cb_notify_lock_release,
};
/*
* We store the NONE, READ, WRITE, and BOTH bits separately in the
* st_{access,deny}_bmap field of the stateid, in order to track not
* only what share bits are currently in force, but also what
* combinations of share bits previous opens have used. This allows us
* to enforce the recommendation in
* https://datatracker.ietf.org/doc/html/rfc7530#section-16.19.4 that
* the server return an error if the client attempt to downgrade to a
* combination of share bits not explicable by closing some of its
* previous opens.
*
* This enforcement is arguably incomplete, since we don't keep
* track of access/deny bit combinations; so, e.g., we allow:
*
* OPEN allow read, deny write
* OPEN allow both, deny none
* DOWNGRADE allow read, deny none
*
* which we should reject.
*
* But you could also argue that our current code is already overkill,
* since it only exists to return NFS4ERR_INVAL on incorrect client
* behavior.
*/
static unsigned int
bmap_to_share_mode(unsigned long bmap)
{
int i;
unsigned int access = 0;
for (i = 1; i < 4; i++) {
if (test_bit(i, &bmap))
access |= i;
}
return access;
}
/* set share access for a given stateid */
static inline void
set_access(u32 access, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << access;
WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
stp->st_access_bmap |= mask;
}
/* clear share access for a given stateid */
static inline void
clear_access(u32 access, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << access;
WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
stp->st_access_bmap &= ~mask;
}
/* test whether a given stateid has access */
static inline bool
test_access(u32 access, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << access;
return (bool)(stp->st_access_bmap & mask);
}
/* set share deny for a given stateid */
static inline void
set_deny(u32 deny, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << deny;
WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
stp->st_deny_bmap |= mask;
}
/* clear share deny for a given stateid */
static inline void
clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << deny;
WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
stp->st_deny_bmap &= ~mask;
}
/* test whether a given stateid is denying specific access */
static inline bool
test_deny(u32 deny, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << deny;
return (bool)(stp->st_deny_bmap & mask);
}
static int nfs4_access_to_omode(u32 access)
{
switch (access & NFS4_SHARE_ACCESS_BOTH) {
case NFS4_SHARE_ACCESS_READ:
return O_RDONLY;
case NFS4_SHARE_ACCESS_WRITE:
return O_WRONLY;
case NFS4_SHARE_ACCESS_BOTH:
return O_RDWR;
}
WARN_ON_ONCE(1);
return O_RDONLY;
}
static inline int
access_permit_read(struct nfs4_ol_stateid *stp)
{
return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
test_access(NFS4_SHARE_ACCESS_WRITE, stp);
}
static inline int
access_permit_write(struct nfs4_ol_stateid *stp)
{
return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
test_access(NFS4_SHARE_ACCESS_BOTH, stp);
}
static inline struct nfs4_stateowner *
nfs4_get_stateowner(struct nfs4_stateowner *sop)
{
atomic_inc(&sop->so_count);
return sop;
}
static int
same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
{
return (sop->so_owner.len == owner->len) &&
0 == memcmp(sop->so_owner.data, owner->data, owner->len);
}
static struct nfs4_openowner *
find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
struct nfs4_client *clp)
{
struct nfs4_stateowner *so;
lockdep_assert_held(&clp->cl_lock);
list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
so_strhash) {
if (!so->so_is_open_owner)
continue;
if (same_owner_str(so, &open->op_owner))
return openowner(nfs4_get_stateowner(so));
}
return NULL;
}
static struct nfs4_openowner *
find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
struct nfs4_client *clp)
{
struct nfs4_openowner *oo;
spin_lock(&clp->cl_lock);
oo = find_openstateowner_str_locked(hashval, open, clp);
spin_unlock(&clp->cl_lock);
return oo;
}
static inline u32
opaque_hashval(const void *ptr, int nbytes)
{
unsigned char *cptr = (unsigned char *) ptr;
u32 x = 0;
while (nbytes--) {
x *= 37;
x += *cptr++;
}
return x;
}
static void nfsd4_free_file_rcu(struct rcu_head *rcu)
{
struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
kmem_cache_free(file_slab, fp);
}
void
put_nfs4_file(struct nfs4_file *fi)
{
if (refcount_dec_and_test(&fi->fi_ref)) {
nfsd4_file_hash_remove(fi);
WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
}
}
static struct nfsd_file *
find_writeable_file_locked(struct nfs4_file *f)
{
struct nfsd_file *ret;
lockdep_assert_held(&f->fi_lock);
ret = nfsd_file_get(f->fi_fds[O_WRONLY]);
if (!ret)
ret = nfsd_file_get(f->fi_fds[O_RDWR]);
return ret;
}
static struct nfsd_file *
find_writeable_file(struct nfs4_file *f)
{
struct nfsd_file *ret;
spin_lock(&f->fi_lock);
ret = find_writeable_file_locked(f);
spin_unlock(&f->fi_lock);
return ret;
}
static struct nfsd_file *
find_readable_file_locked(struct nfs4_file *f)
{
struct nfsd_file *ret;
lockdep_assert_held(&f->fi_lock);
ret = nfsd_file_get(f->fi_fds[O_RDONLY]);
if (!ret)
ret = nfsd_file_get(f->fi_fds[O_RDWR]);
return ret;
}
static struct nfsd_file *
find_readable_file(struct nfs4_file *f)
{
struct nfsd_file *ret;
spin_lock(&f->fi_lock);
ret = find_readable_file_locked(f);
spin_unlock(&f->fi_lock);
return ret;
}
static struct nfsd_file *
find_rw_file(struct nfs4_file *f)
{
struct nfsd_file *ret;
spin_lock(&f->fi_lock);
ret = nfsd_file_get(f->fi_fds[O_RDWR]);
spin_unlock(&f->fi_lock);
return ret;
}
struct nfsd_file *
find_any_file(struct nfs4_file *f)
{
struct nfsd_file *ret;
if (!f)
return NULL;
spin_lock(&f->fi_lock);
ret = nfsd_file_get(f->fi_fds[O_RDWR]);
if (!ret) {
ret = nfsd_file_get(f->fi_fds[O_WRONLY]);
if (!ret)
ret = nfsd_file_get(f->fi_fds[O_RDONLY]);
}
spin_unlock(&f->fi_lock);
return ret;
}
static struct nfsd_file *find_any_file_locked(struct nfs4_file *f)
{
lockdep_assert_held(&f->fi_lock);
if (f->fi_fds[O_RDWR])
return f->fi_fds[O_RDWR];
if (f->fi_fds[O_WRONLY])
return f->fi_fds[O_WRONLY];
if (f->fi_fds[O_RDONLY])
return f->fi_fds[O_RDONLY];
return NULL;
}
static atomic_long_t num_delegations;
unsigned long max_delegations;
/*
* Open owner state (share locks)
*/
/* hash tables for lock and open owners */
#define OWNER_HASH_BITS 8
#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
{
unsigned int ret;
ret = opaque_hashval(ownername->data, ownername->len);
return ret & OWNER_HASH_MASK;
}
static struct rhltable nfs4_file_rhltable ____cacheline_aligned_in_smp;
static const struct rhashtable_params nfs4_file_rhash_params = {
.key_len = sizeof_field(struct nfs4_file, fi_inode),
.key_offset = offsetof(struct nfs4_file, fi_inode),
.head_offset = offsetof(struct nfs4_file, fi_rlist),
/*
* Start with a single page hash table to reduce resizing churn
* on light workloads.
*/
.min_size = 256,
.automatic_shrinking = true,
};
/*
* Check if courtesy clients have conflicting access and resolve it if possible
*
* access: is op_share_access if share_access is true.
* Check if access mode, op_share_access, would conflict with
* the current deny mode of the file 'fp'.
* access: is op_share_deny if share_access is false.
* Check if the deny mode, op_share_deny, would conflict with
* current access of the file 'fp'.
* stp: skip checking this entry.
* new_stp: normal open, not open upgrade.
*
* Function returns:
* false - access/deny mode conflict with normal client.
* true - no conflict or conflict with courtesy client(s) is resolved.
*/
static bool
nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp,
struct nfs4_ol_stateid *stp, u32 access, bool share_access)
{
struct nfs4_ol_stateid *st;
bool resolvable = true;
unsigned char bmap;
struct nfsd_net *nn;
struct nfs4_client *clp;
lockdep_assert_held(&fp->fi_lock);
list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
/* ignore lock stateid */
if (st->st_openstp)
continue;
if (st == stp && new_stp)
continue;
/* check file access against deny mode or vice versa */
bmap = share_access ? st->st_deny_bmap : st->st_access_bmap;
if (!(access & bmap_to_share_mode(bmap)))
continue;
clp = st->st_stid.sc_client;
if (try_to_expire_client(clp))
continue;
resolvable = false;
break;
}
if (resolvable) {
clp = stp->st_stid.sc_client;
nn = net_generic(clp->net, nfsd_net_id);
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
}
return resolvable;
}
static void
__nfs4_file_get_access(struct nfs4_file *fp, u32 access)
{
lockdep_assert_held(&fp->fi_lock);
if (access & NFS4_SHARE_ACCESS_WRITE)
atomic_inc(&fp->fi_access[O_WRONLY]);
if (access & NFS4_SHARE_ACCESS_READ)
atomic_inc(&fp->fi_access[O_RDONLY]);
}
static __be32
nfs4_file_get_access(struct nfs4_file *fp, u32 access)
{
lockdep_assert_held(&fp->fi_lock);
/* Does this access mode make sense? */
if (access & ~NFS4_SHARE_ACCESS_BOTH)
return nfserr_inval;
/* Does it conflict with a deny mode already set? */
if ((access & fp->fi_share_deny) != 0)
return nfserr_share_denied;
__nfs4_file_get_access(fp, access);
return nfs_ok;
}
static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
{
/* Common case is that there is no deny mode. */
if (deny) {
/* Does this deny mode make sense? */
if (deny & ~NFS4_SHARE_DENY_BOTH)
return nfserr_inval;
if ((deny & NFS4_SHARE_DENY_READ) &&
atomic_read(&fp->fi_access[O_RDONLY]))
return nfserr_share_denied;
if ((deny & NFS4_SHARE_DENY_WRITE) &&
atomic_read(&fp->fi_access[O_WRONLY]))
return nfserr_share_denied;
}
return nfs_ok;
}
static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
{
might_lock(&fp->fi_lock);
if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
struct nfsd_file *f1 = NULL;
struct nfsd_file *f2 = NULL;
swap(f1, fp->fi_fds[oflag]);
if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
swap(f2, fp->fi_fds[O_RDWR]);
spin_unlock(&fp->fi_lock);
if (f1)
nfsd_file_put(f1);
if (f2)
nfsd_file_put(f2);
}
}
static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
{
WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
if (access & NFS4_SHARE_ACCESS_WRITE)
__nfs4_file_put_access(fp, O_WRONLY);
if (access & NFS4_SHARE_ACCESS_READ)
__nfs4_file_put_access(fp, O_RDONLY);
}
/*
* Allocate a new open/delegation state counter. This is needed for
* pNFS for proper return on close semantics.
*
* Note that we only allocate it for pNFS-enabled exports, otherwise
* all pointers to struct nfs4_clnt_odstate are always NULL.
*/
static struct nfs4_clnt_odstate *
alloc_clnt_odstate(struct nfs4_client *clp)
{
struct nfs4_clnt_odstate *co;
co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
if (co) {
co->co_client = clp;
refcount_set(&co->co_odcount, 1);
}
return co;
}
static void
hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
{
struct nfs4_file *fp = co->co_file;
lockdep_assert_held(&fp->fi_lock);
list_add(&co->co_perfile, &fp->fi_clnt_odstate);
}
static inline void
get_clnt_odstate(struct nfs4_clnt_odstate *co)
{
if (co)
refcount_inc(&co->co_odcount);
}
static void
put_clnt_odstate(struct nfs4_clnt_odstate *co)
{
struct nfs4_file *fp;
if (!co)
return;
fp = co->co_file;
if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
list_del(&co->co_perfile);
spin_unlock(&fp->fi_lock);
nfsd4_return_all_file_layouts(co->co_client, fp);
kmem_cache_free(odstate_slab, co);
}
}
static struct nfs4_clnt_odstate *
find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
{
struct nfs4_clnt_odstate *co;
struct nfs4_client *cl;
if (!new)
return NULL;
cl = new->co_client;
spin_lock(&fp->fi_lock);
list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
if (co->co_client == cl) {
get_clnt_odstate(co);
goto out;
}
}
co = new;
co->co_file = fp;
hash_clnt_odstate_locked(new);
out:
spin_unlock(&fp->fi_lock);
return co;
}
struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
void (*sc_free)(struct nfs4_stid *))
{
struct nfs4_stid *stid;
int new_id;
stid = kmem_cache_zalloc(slab, GFP_KERNEL);
if (!stid)
return NULL;
idr_preload(GFP_KERNEL);
spin_lock(&cl->cl_lock);
/* Reserving 0 for start of file in nfsdfs "states" file: */
new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT);
spin_unlock(&cl->cl_lock);
idr_preload_end();
if (new_id < 0)
goto out_free;
stid->sc_free = sc_free;
stid->sc_client = cl;
stid->sc_stateid.si_opaque.so_id = new_id;
stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
/* Will be incremented before return to client: */
refcount_set(&stid->sc_count, 1);
spin_lock_init(&stid->sc_lock);
INIT_LIST_HEAD(&stid->sc_cp_list);
/*
* It shouldn't be a problem to reuse an opaque stateid value.
* I don't think it is for 4.1. But with 4.0 I worry that, for
* example, a stray write retransmission could be accepted by
* the server when it should have been rejected. Therefore,
* adopt a trick from the sctp code to attempt to maximize the
* amount of time until an id is reused, by ensuring they always
* "increase" (mod INT_MAX):
*/
return stid;
out_free:
kmem_cache_free(slab, stid);
return NULL;
}
/*
* Create a unique stateid_t to represent each COPY.
*/
static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
unsigned char cs_type)
{
int new_id;
stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
idr_preload(GFP_KERNEL);
spin_lock(&nn->s2s_cp_lock);
new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, stid, 0, 0, GFP_NOWAIT);
stid->cs_stid.si_opaque.so_id = new_id;
stid->cs_stid.si_generation = 1;
spin_unlock(&nn->s2s_cp_lock);
idr_preload_end();
if (new_id < 0)
return 0;
stid->cs_type = cs_type;
return 1;
}
int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
{
return nfs4_init_cp_state(nn, &copy->cp_stateid, NFS4_COPY_STID);
}
struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
struct nfs4_stid *p_stid)
{
struct nfs4_cpntf_state *cps;
cps = kzalloc(sizeof(struct nfs4_cpntf_state), GFP_KERNEL);
if (!cps)
return NULL;
cps->cpntf_time = ktime_get_boottime_seconds();
refcount_set(&cps->cp_stateid.cs_count, 1);
if (!nfs4_init_cp_state(nn, &cps->cp_stateid, NFS4_COPYNOTIFY_STID))
goto out_free;
spin_lock(&nn->s2s_cp_lock);
list_add(&cps->cp_list, &p_stid->sc_cp_list);
spin_unlock(&nn->s2s_cp_lock);
return cps;
out_free:
kfree(cps);
return NULL;
}
void nfs4_free_copy_state(struct nfsd4_copy *copy)
{
struct nfsd_net *nn;
if (copy->cp_stateid.cs_type != NFS4_COPY_STID)
return;
nn = net_generic(copy->cp_clp->net, nfsd_net_id);
spin_lock(&nn->s2s_cp_lock);
idr_remove(&nn->s2s_cp_stateids,
copy->cp_stateid.cs_stid.si_opaque.so_id);
spin_unlock(&nn->s2s_cp_lock);
}
static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid)
{
struct nfs4_cpntf_state *cps;
struct nfsd_net *nn;
nn = net_generic(net, nfsd_net_id);
spin_lock(&nn->s2s_cp_lock);
while (!list_empty(&stid->sc_cp_list)) {
cps = list_first_entry(&stid->sc_cp_list,
struct nfs4_cpntf_state, cp_list);
_free_cpntf_state_locked(nn, cps);
}
spin_unlock(&nn->s2s_cp_lock);
}
static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
{
struct nfs4_stid *stid;
stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
if (!stid)
return NULL;
return openlockstateid(stid);
}
static void nfs4_free_deleg(struct nfs4_stid *stid)
{
struct nfs4_delegation *dp = delegstateid(stid);
WARN_ON_ONCE(!list_empty(&stid->sc_cp_list));
WARN_ON_ONCE(!list_empty(&dp->dl_perfile));
WARN_ON_ONCE(!list_empty(&dp->dl_perclnt));
WARN_ON_ONCE(!list_empty(&dp->dl_recall_lru));
kmem_cache_free(deleg_slab, stid);
atomic_long_dec(&num_delegations);
}
/*
* When we recall a delegation, we should be careful not to hand it
* out again straight away.
* To ensure this we keep a pair of bloom filters ('new' and 'old')
* in which the filehandles of recalled delegations are "stored".
* If a filehandle appear in either filter, a delegation is blocked.
* When a delegation is recalled, the filehandle is stored in the "new"
* filter.
* Every 30 seconds we swap the filters and clear the "new" one,
* unless both are empty of course.
*
* Each filter is 256 bits. We hash the filehandle to 32bit and use the
* low 3 bytes as hash-table indices.
*
* 'blocked_delegations_lock', which is always taken in block_delegations(),
* is used to manage concurrent access. Testing does not need the lock
* except when swapping the two filters.
*/
static DEFINE_SPINLOCK(blocked_delegations_lock);
static struct bloom_pair {
int entries, old_entries;
time64_t swap_time;
int new; /* index into 'set' */
DECLARE_BITMAP(set[2], 256);
} blocked_delegations;
static int delegation_blocked(struct knfsd_fh *fh)
{
u32 hash;
struct bloom_pair *bd = &blocked_delegations;
if (bd->entries == 0)
return 0;
if (ktime_get_seconds() - bd->swap_time > 30) {
spin_lock(&blocked_delegations_lock);
if (ktime_get_seconds() - bd->swap_time > 30) {
bd->entries -= bd->old_entries;
bd->old_entries = bd->entries;
memset(bd->set[bd->new], 0,
sizeof(bd->set[0]));
bd->new = 1-bd->new;
bd->swap_time = ktime_get_seconds();
}
spin_unlock(&blocked_delegations_lock);
}
hash = jhash(&fh->fh_raw, fh->fh_size, 0);
if (test_bit(hash&255, bd->set[0]) &&
test_bit((hash>>8)&255, bd->set[0]) &&
test_bit((hash>>16)&255, bd->set[0]))
return 1;
if (test_bit(hash&255, bd->set[1]) &&
test_bit((hash>>8)&255, bd->set[1]) &&
test_bit((hash>>16)&255, bd->set[1]))
return 1;
return 0;
}
static void block_delegations(struct knfsd_fh *fh)
{
u32 hash;
struct bloom_pair *bd = &blocked_delegations;
hash = jhash(&fh->fh_raw, fh->fh_size, 0);
spin_lock(&blocked_delegations_lock);
__set_bit(hash&255, bd->set[bd->new]);
__set_bit((hash>>8)&255, bd->set[bd->new]);
__set_bit((hash>>16)&255, bd->set[bd->new]);
if (bd->entries == 0)
bd->swap_time = ktime_get_seconds();
bd->entries += 1;
spin_unlock(&blocked_delegations_lock);
}
static struct nfs4_delegation *
alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
struct nfs4_clnt_odstate *odstate, u32 dl_type)
{
struct nfs4_delegation *dp;
long n;
dprintk("NFSD alloc_init_deleg\n");
n = atomic_long_inc_return(&num_delegations);
if (n < 0 || n > max_delegations)
goto out_dec;
if (delegation_blocked(&fp->fi_fhandle))
goto out_dec;
dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
if (dp == NULL)
goto out_dec;
/*
* delegation seqid's are never incremented. The 4.1 special
* meaning of seqid 0 isn't meaningful, really, but let's avoid
* 0 anyway just for consistency and use 1:
*/
dp->dl_stid.sc_stateid.si_generation = 1;
INIT_LIST_HEAD(&dp->dl_perfile);
INIT_LIST_HEAD(&dp->dl_perclnt);
INIT_LIST_HEAD(&dp->dl_recall_lru);
dp->dl_clnt_odstate = odstate;
get_clnt_odstate(odstate);
dp->dl_type = dl_type;
dp->dl_retries = 1;
dp->dl_recalled = false;
nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
&nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
get_nfs4_file(fp);
dp->dl_stid.sc_file = fp;
return dp;
out_dec:
atomic_long_dec(&num_delegations);
return NULL;
}
void
nfs4_put_stid(struct nfs4_stid *s)
{
struct nfs4_file *fp = s->sc_file;
struct nfs4_client *clp = s->sc_client;
might_lock(&clp->cl_lock);
if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
wake_up_all(&close_wq);
return;
}
idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
nfs4_free_cpntf_statelist(clp->net, s);
spin_unlock(&clp->cl_lock);
s->sc_free(s);
if (fp)
put_nfs4_file(fp);
}
void
nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
{
stateid_t *src = &stid->sc_stateid;
spin_lock(&stid->sc_lock);
if (unlikely(++src->si_generation == 0))
src->si_generation = 1;
memcpy(dst, src, sizeof(*dst));
spin_unlock(&stid->sc_lock);
}
static void put_deleg_file(struct nfs4_file *fp)
{
struct nfsd_file *nf = NULL;
spin_lock(&fp->fi_lock);
if (--fp->fi_delegees == 0)
swap(nf, fp->fi_deleg_file);
spin_unlock(&fp->fi_lock);
if (nf)
nfsd_file_put(nf);
}
static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
{
struct nfs4_file *fp = dp->dl_stid.sc_file;
struct nfsd_file *nf = fp->fi_deleg_file;
WARN_ON_ONCE(!fp->fi_delegees);
vfs_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
put_deleg_file(fp);
}
static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
{
put_clnt_odstate(dp->dl_clnt_odstate);
nfs4_unlock_deleg_lease(dp);
nfs4_put_stid(&dp->dl_stid);
}
void nfs4_unhash_stid(struct nfs4_stid *s)
{
s->sc_type = 0;
}
/**
* nfs4_delegation_exists - Discover if this delegation already exists
* @clp: a pointer to the nfs4_client we're granting a delegation to
* @fp: a pointer to the nfs4_file we're granting a delegation on
*
* Return:
* On success: true iff an existing delegation is found
*/
static bool
nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
{
struct nfs4_delegation *searchdp = NULL;
struct nfs4_client *searchclp = NULL;
lockdep_assert_held(&state_lock);
lockdep_assert_held(&fp->fi_lock);
list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
searchclp = searchdp->dl_stid.sc_client;
if (clp == searchclp) {
return true;
}
}
return false;
}
/**
* hash_delegation_locked - Add a delegation to the appropriate lists
* @dp: a pointer to the nfs4_delegation we are adding.
* @fp: a pointer to the nfs4_file we're granting a delegation on
*
* Return:
* On success: NULL if the delegation was successfully hashed.
*
* On error: -EAGAIN if one was previously granted to this
* nfs4_client for this nfs4_file. Delegation is not hashed.
*
*/
static int
hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
{
struct nfs4_client *clp = dp->dl_stid.sc_client;
lockdep_assert_held(&state_lock);
lockdep_assert_held(&fp->fi_lock);
if (nfs4_delegation_exists(clp, fp))
return -EAGAIN;
refcount_inc(&dp->dl_stid.sc_count);
dp->dl_stid.sc_type = NFS4_DELEG_STID;
list_add(&dp->dl_perfile, &fp->fi_delegations);
list_add(&dp->dl_perclnt, &clp->cl_delegations);
return 0;
}
static bool delegation_hashed(struct nfs4_delegation *dp)
{
return !(list_empty(&dp->dl_perfile));
}
static bool
unhash_delegation_locked(struct nfs4_delegation *dp)
{
struct nfs4_file *fp = dp->dl_stid.sc_file;
lockdep_assert_held(&state_lock);
if (!delegation_hashed(dp))
return false;
dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
/* Ensure that deleg break won't try to requeue it */
++dp->dl_time;
spin_lock(&fp->fi_lock);
list_del_init(&dp->dl_perclnt);
list_del_init(&dp->dl_recall_lru);
list_del_init(&dp->dl_perfile);
spin_unlock(&fp->fi_lock);
return true;
}
static void destroy_delegation(struct nfs4_delegation *dp)
{
bool unhashed;
spin_lock(&state_lock);
unhashed = unhash_delegation_locked(dp);
spin_unlock(&state_lock);
if (unhashed)
destroy_unhashed_deleg(dp);
}
static void revoke_delegation(struct nfs4_delegation *dp)
{
struct nfs4_client *clp = dp->dl_stid.sc_client;
WARN_ON(!list_empty(&dp->dl_recall_lru));
trace_nfsd_stid_revoke(&dp->dl_stid);
if (clp->cl_minorversion) {
spin_lock(&clp->cl_lock);
dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
refcount_inc(&dp->dl_stid.sc_count);
list_add(&dp->dl_recall_lru, &clp->cl_revoked);
spin_unlock(&clp->cl_lock);
}
destroy_unhashed_deleg(dp);
}
/*
* SETCLIENTID state
*/
static unsigned int clientid_hashval(u32 id)
{
return id & CLIENT_HASH_MASK;
}
static unsigned int clientstr_hashval(struct xdr_netobj name)
{
return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
}
/*
* A stateid that had a deny mode associated with it is being released
* or downgraded. Recalculate the deny mode on the file.
*/
static void
recalculate_deny_mode(struct nfs4_file *fp)
{
struct nfs4_ol_stateid *stp;
spin_lock(&fp->fi_lock);
fp->fi_share_deny = 0;
list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
spin_unlock(&fp->fi_lock);
}
static void
reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
{
int i;
bool change = false;
for (i = 1; i < 4; i++) {
if ((i & deny) != i) {
change = true;
clear_deny(i, stp);
}
}
/* Recalculate per-file deny mode if there was a change */
if (change)
recalculate_deny_mode(stp->st_stid.sc_file);
}
/* release all access and file references for a given stateid */
static void
release_all_access(struct nfs4_ol_stateid *stp)
{
int i;
struct nfs4_file *fp = stp->st_stid.sc_file;
if (fp && stp->st_deny_bmap != 0)
recalculate_deny_mode(fp);
for (i = 1; i < 4; i++) {
if (test_access(i, stp))
nfs4_file_put_access(stp->st_stid.sc_file, i);
clear_access(i, stp);
}
}
static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
{
kfree(sop->so_owner.data);
sop->so_ops->so_free(sop);
}
static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
{
struct nfs4_client *clp = sop->so_client;
might_lock(&clp->cl_lock);
if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
return;
sop->so_ops->so_unhash(sop);
spin_unlock(&clp->cl_lock);
nfs4_free_stateowner(sop);
}
static bool
nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
{
return list_empty(&stp->st_perfile);
}
static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
{
struct nfs4_file *fp = stp->st_stid.sc_file;
lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
if (list_empty(&stp->st_perfile))
return false;
spin_lock(&fp->fi_lock);
list_del_init(&stp->st_perfile);
spin_unlock(&fp->fi_lock);
list_del(&stp->st_perstateowner);
return true;
}
static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
{
struct nfs4_ol_stateid *stp = openlockstateid(stid);
put_clnt_odstate(stp->st_clnt_odstate);
release_all_access(stp);
if (stp->st_stateowner)
nfs4_put_stateowner(stp->st_stateowner);
WARN_ON(!list_empty(&stid->sc_cp_list));
kmem_cache_free(stateid_slab, stid);
}
static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
{
struct nfs4_ol_stateid *stp = openlockstateid(stid);
struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
struct nfsd_file *nf;
nf = find_any_file(stp->st_stid.sc_file);
if (nf) {
get_file(nf->nf_file);
filp_close(nf->nf_file, (fl_owner_t)lo);
nfsd_file_put(nf);
}
nfs4_free_ol_stateid(stid);
}
/*
* Put the persistent reference to an already unhashed generic stateid, while
* holding the cl_lock. If it's the last reference, then put it onto the
* reaplist for later destruction.
*/
static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
struct list_head *reaplist)
{
struct nfs4_stid *s = &stp->st_stid;
struct nfs4_client *clp = s->sc_client;
lockdep_assert_held(&clp->cl_lock);
WARN_ON_ONCE(!list_empty(&stp->st_locks));
if (!refcount_dec_and_test(&s->sc_count)) {
wake_up_all(&close_wq);
return;
}
idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
list_add(&stp->st_locks, reaplist);
}
static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
{
lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
if (!unhash_ol_stateid(stp))
return false;
list_del_init(&stp->st_locks);
nfs4_unhash_stid(&stp->st_stid);
return true;
}
static void release_lock_stateid(struct nfs4_ol_stateid *stp)
{
struct nfs4_client *clp = stp->st_stid.sc_client;
bool unhashed;
spin_lock(&clp->cl_lock);
unhashed = unhash_lock_stateid(stp);
spin_unlock(&clp->cl_lock);
if (unhashed)
nfs4_put_stid(&stp->st_stid);
}
static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
{
struct nfs4_client *clp = lo->lo_owner.so_client;
lockdep_assert_held(&clp->cl_lock);
list_del_init(&lo->lo_owner.so_strhash);
}
/*
* Free a list of generic stateids that were collected earlier after being
* fully unhashed.
*/
static void
free_ol_stateid_reaplist(struct list_head *reaplist)
{
struct nfs4_ol_stateid *stp;
struct nfs4_file *fp;
might_sleep();
while (!list_empty(reaplist)) {
stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
st_locks);
list_del(&stp->st_locks);
fp = stp->st_stid.sc_file;
stp->st_stid.sc_free(&stp->st_stid);
if (fp)
put_nfs4_file(fp);
}
}
static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
struct list_head *reaplist)
{
struct nfs4_ol_stateid *stp;
lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
while (!list_empty(&open_stp->st_locks)) {
stp = list_entry(open_stp->st_locks.next,
struct nfs4_ol_stateid, st_locks);
WARN_ON(!unhash_lock_stateid(stp));
put_ol_stateid_locked(stp, reaplist);
}
}
static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
struct list_head *reaplist)
{
lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
if (!unhash_ol_stateid(stp))
return false;
release_open_stateid_locks(stp, reaplist);
return true;
}
static void release_open_stateid(struct nfs4_ol_stateid *stp)
{
LIST_HEAD(reaplist);
spin_lock(&stp->st_stid.sc_client->cl_lock);
if (unhash_open_stateid(stp, &reaplist))
put_ol_stateid_locked(stp, &reaplist);
spin_unlock(&stp->st_stid.sc_client->cl_lock);
free_ol_stateid_reaplist(&reaplist);
}
static void unhash_openowner_locked(struct nfs4_openowner *oo)
{
struct nfs4_client *clp = oo->oo_owner.so_client;
lockdep_assert_held(&clp->cl_lock);
list_del_init(&oo->oo_owner.so_strhash);
list_del_init(&oo->oo_perclient);
}
static void release_last_closed_stateid(struct nfs4_openowner *oo)
{
struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
nfsd_net_id);
struct nfs4_ol_stateid *s;
spin_lock(&nn->client_lock);
s = oo->oo_last_closed_stid;
if (s) {
list_del_init(&oo->oo_close_lru);
oo->oo_last_closed_stid = NULL;
}
spin_unlock(&nn->client_lock);
if (s)
nfs4_put_stid(&s->st_stid);
}
static void release_openowner(struct nfs4_openowner *oo)
{
struct nfs4_ol_stateid *stp;
struct nfs4_client *clp = oo->oo_owner.so_client;
struct list_head reaplist;
INIT_LIST_HEAD(&reaplist);
spin_lock(&clp->cl_lock);
unhash_openowner_locked(oo);
while (!list_empty(&oo->oo_owner.so_stateids)) {
stp = list_first_entry(&oo->oo_owner.so_stateids,
struct nfs4_ol_stateid, st_perstateowner);
if (unhash_open_stateid(stp, &reaplist))
put_ol_stateid_locked(stp, &reaplist);
}
spin_unlock(&clp->cl_lock);
free_ol_stateid_reaplist(&reaplist);
release_last_closed_stateid(oo);
nfs4_put_stateowner(&oo->oo_owner);
}
static inline int
hash_sessionid(struct nfs4_sessionid *sessionid)
{
struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
return sid->sequence % SESSION_HASH_SIZE;
}
#ifdef CONFIG_SUNRPC_DEBUG
static inline void
dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
{
u32 *ptr = (u32 *)(&sessionid->data[0]);
dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
}
#else
static inline void
dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
{
}
#endif
/*
* Bump the seqid on cstate->replay_owner, and clear replay_owner if it
* won't be used for replay.
*/
void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
{
struct nfs4_stateowner *so = cstate->replay_owner;
if (nfserr == nfserr_replay_me)
return;
if (!seqid_mutating_err(ntohl(nfserr))) {
nfsd4_cstate_clear_replay(cstate);
return;
}
if (!so)
return;
if (so->so_is_open_owner)
release_last_closed_stateid(openowner(so));
so->so_seqid++;
return;
}
static void
gen_sessionid(struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd4_sessionid *sid;
sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
sid->clientid = clp->cl_clientid;
sid->sequence = current_sessionid++;
sid->reserved = 0;
}
/*
* The protocol defines ca_maxresponssize_cached to include the size of
* the rpc header, but all we need to cache is the data starting after
* the end of the initial SEQUENCE operation--the rest we regenerate
* each time. Therefore we can advertise a ca_maxresponssize_cached
* value that is the number of bytes in our cache plus a few additional
* bytes. In order to stay on the safe side, and not promise more than
* we can cache, those additional bytes must be the minimum possible: 24
* bytes of rpc header (xid through accept state, with AUTH_NULL
* verifier), 12 for the compound header (with zero-length tag), and 44
* for the SEQUENCE op response:
*/
#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
static void
free_session_slots(struct nfsd4_session *ses)
{
int i;
for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
free_svc_cred(&ses->se_slots[i]->sl_cred);
kfree(ses->se_slots[i]);
}
}
/*
* We don't actually need to cache the rpc and session headers, so we
* can allocate a little less for each slot:
*/
static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
{
u32 size;
if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
size = 0;
else
size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
return size + sizeof(struct nfsd4_slot);
}
/*
* XXX: If we run out of reserved DRC memory we could (up to a point)
* re-negotiate active sessions and reduce their slot usage to make
* room for new connections. For now we just fail the create session.
*/
static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
{
u32 slotsize = slot_bytes(ca);
u32 num = ca->maxreqs;
unsigned long avail, total_avail;
unsigned int scale_factor;
spin_lock(&nfsd_drc_lock);
if (nfsd_drc_max_mem > nfsd_drc_mem_used)
total_avail = nfsd_drc_max_mem - nfsd_drc_mem_used;
else
/* We have handed out more space than we chose in
* set_max_drc() to allow. That isn't really a
* problem as long as that doesn't make us think we
* have lots more due to integer overflow.
*/
total_avail = 0;
avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, total_avail);
/*
* Never use more than a fraction of the remaining memory,
* unless it's the only way to give this client a slot.
* The chosen fraction is either 1/8 or 1/number of threads,
* whichever is smaller. This ensures there are adequate
* slots to support multiple clients per thread.
* Give the client one slot even if that would require
* over-allocation--it is better than failure.
*/
scale_factor = max_t(unsigned int, 8, nn->nfsd_serv->sv_nrthreads);
avail = clamp_t(unsigned long, avail, slotsize,
total_avail/scale_factor);
num = min_t(int, num, avail / slotsize);
num = max_t(int, num, 1);
nfsd_drc_mem_used += num * slotsize;
spin_unlock(&nfsd_drc_lock);
return num;
}
static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
{
int slotsize = slot_bytes(ca);
spin_lock(&nfsd_drc_lock);
nfsd_drc_mem_used -= slotsize * ca->maxreqs;
spin_unlock(&nfsd_drc_lock);
}
static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
struct nfsd4_channel_attrs *battrs)
{
int numslots = fattrs->maxreqs;
int slotsize = slot_bytes(fattrs);
struct nfsd4_session *new;
int i;
BUILD_BUG_ON(struct_size(new, se_slots, NFSD_MAX_SLOTS_PER_SESSION)
> PAGE_SIZE);
new = kzalloc(struct_size(new, se_slots, numslots), GFP_KERNEL);
if (!new)
return NULL;
/* allocate each struct nfsd4_slot and data cache in one piece */
for (i = 0; i < numslots; i++) {
new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
if (!new->se_slots[i])
goto out_free;
}
memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
return new;
out_free:
while (i--)
kfree(new->se_slots[i]);
kfree(new);
return NULL;
}
static void free_conn(struct nfsd4_conn *c)
{
svc_xprt_put(c->cn_xprt);
kfree(c);
}
static void nfsd4_conn_lost(struct svc_xpt_user *u)
{
struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
struct nfs4_client *clp = c->cn_session->se_client;
trace_nfsd_cb_lost(clp);
spin_lock(&clp->cl_lock);
if (!list_empty(&c->cn_persession)) {
list_del(&c->cn_persession);
free_conn(c);
}
nfsd4_probe_callback(clp);
spin_unlock(&clp->cl_lock);
}
static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
{
struct nfsd4_conn *conn;
conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
if (!conn)
return NULL;
svc_xprt_get(rqstp->rq_xprt);
conn->cn_xprt = rqstp->rq_xprt;
conn->cn_flags = flags;
INIT_LIST_HEAD(&conn->cn_xpt_user.list);
return conn;
}
static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
{
conn->cn_session = ses;
list_add(&conn->cn_persession, &ses->se_conns);
}
static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
spin_lock(&clp->cl_lock);
__nfsd4_hash_conn(conn, ses);
spin_unlock(&clp->cl_lock);
}
static int nfsd4_register_conn(struct nfsd4_conn *conn)
{
conn->cn_xpt_user.callback = nfsd4_conn_lost;
return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
}
static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
{
int ret;
nfsd4_hash_conn(conn, ses);
ret = nfsd4_register_conn(conn);
if (ret)
/* oops; xprt is already down: */
nfsd4_conn_lost(&conn->cn_xpt_user);
/* We may have gained or lost a callback channel: */
nfsd4_probe_callback_sync(ses->se_client);
}
static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
{
u32 dir = NFS4_CDFC4_FORE;
if (cses->flags & SESSION4_BACK_CHAN)
dir |= NFS4_CDFC4_BACK;
return alloc_conn(rqstp, dir);
}
/* must be called under client_lock */
static void nfsd4_del_conns(struct nfsd4_session *s)
{
struct nfs4_client *clp = s->se_client;
struct nfsd4_conn *c;
spin_lock(&clp->cl_lock);
while (!list_empty(&s->se_conns)) {
c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
list_del_init(&c->cn_persession);
spin_unlock(&clp->cl_lock);
unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
free_conn(c);
spin_lock(&clp->cl_lock);
}
spin_unlock(&clp->cl_lock);
}
static void __free_session(struct nfsd4_session *ses)
{
free_session_slots(ses);
kfree(ses);
}
static void free_session(struct nfsd4_session *ses)
{
nfsd4_del_conns(ses);
nfsd4_put_drc_mem(&ses->se_fchannel);
__free_session(ses);
}
static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
{
int idx;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
new->se_client = clp;
gen_sessionid(new);
INIT_LIST_HEAD(&new->se_conns);
new->se_cb_seq_nr = 1;
new->se_flags = cses->flags;
new->se_cb_prog = cses->callback_prog;
new->se_cb_sec = cses->cb_sec;
atomic_set(&new->se_ref, 0);
idx = hash_sessionid(&new->se_sessionid);
list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
spin_lock(&clp->cl_lock);
list_add(&new->se_perclnt, &clp->cl_sessions);
spin_unlock(&clp->cl_lock);
{
struct sockaddr *sa = svc_addr(rqstp);
/*
* This is a little silly; with sessions there's no real
* use for the callback address. Use the peer address
* as a reasonable default for now, but consider fixing
* the rpc client not to require an address in the
* future:
*/
rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
}
}
/* caller must hold client_lock */
static struct nfsd4_session *
__find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
{
struct nfsd4_session *elem;
int idx;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
dump_sessionid(__func__, sessionid);
idx = hash_sessionid(sessionid);
/* Search in the appropriate list */
list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
if (!memcmp(elem->se_sessionid.data, sessionid->data,
NFS4_MAX_SESSIONID_LEN)) {
return elem;
}
}
dprintk("%s: session not found\n", __func__);
return NULL;
}
static struct nfsd4_session *
find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
__be32 *ret)
{
struct nfsd4_session *session;
__be32 status = nfserr_badsession;
session = __find_in_sessionid_hashtbl(sessionid, net);
if (!session)
goto out;
status = nfsd4_get_session_locked(session);
if (status)
session = NULL;
out:
*ret = status;
return session;
}
/* caller must hold client_lock */
static void
unhash_session(struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
list_del(&ses->se_hash);
spin_lock(&ses->se_client->cl_lock);
list_del(&ses->se_perclnt);
spin_unlock(&ses->se_client->cl_lock);
}
/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
static int
STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
{
/*
* We're assuming the clid was not given out from a boot
* precisely 2^32 (about 136 years) before this one. That seems
* a safe assumption:
*/
if (clid->cl_boot == (u32)nn->boot_time)
return 0;
trace_nfsd_clid_stale(clid);
return 1;
}
/*
* XXX Should we use a slab cache ?
* This type of memory management is somewhat inefficient, but we use it
* anyway since SETCLIENTID is not a common operation.
*/
static struct nfs4_client *alloc_client(struct xdr_netobj name,
struct nfsd_net *nn)
{
struct nfs4_client *clp;
int i;
if (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) {
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
return NULL;
}
clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
if (clp == NULL)
return NULL;
xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL);
if (clp->cl_name.data == NULL)
goto err_no_name;
clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
sizeof(struct list_head),
GFP_KERNEL);
if (!clp->cl_ownerstr_hashtbl)
goto err_no_hashtbl;
for (i = 0; i < OWNER_HASH_SIZE; i++)
INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
INIT_LIST_HEAD(&clp->cl_sessions);
idr_init(&clp->cl_stateids);
atomic_set(&clp->cl_rpc_users, 0);
clp->cl_cb_state = NFSD4_CB_UNKNOWN;
clp->cl_state = NFSD4_ACTIVE;
atomic_inc(&nn->nfs4_client_count);
atomic_set(&clp->cl_delegs_in_recall, 0);
INIT_LIST_HEAD(&clp->cl_idhash);
INIT_LIST_HEAD(&clp->cl_openowners);
INIT_LIST_HEAD(&clp->cl_delegations);
INIT_LIST_HEAD(&clp->cl_lru);
INIT_LIST_HEAD(&clp->cl_revoked);
#ifdef CONFIG_NFSD_PNFS
INIT_LIST_HEAD(&clp->cl_lo_states);
#endif
INIT_LIST_HEAD(&clp->async_copies);
spin_lock_init(&clp->async_lock);
spin_lock_init(&clp->cl_lock);
rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
return clp;
err_no_hashtbl:
kfree(clp->cl_name.data);
err_no_name:
kmem_cache_free(client_slab, clp);
return NULL;
}
static void __free_client(struct kref *k)
{
struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
free_svc_cred(&clp->cl_cred);
kfree(clp->cl_ownerstr_hashtbl);
kfree(clp->cl_name.data);
kfree(clp->cl_nii_domain.data);
kfree(clp->cl_nii_name.data);
idr_destroy(&clp->cl_stateids);
kfree(clp->cl_ra);
kmem_cache_free(client_slab, clp);
}
static void drop_client(struct nfs4_client *clp)
{
kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
}
static void
free_client(struct nfs4_client *clp)
{
while (!list_empty(&clp->cl_sessions)) {
struct nfsd4_session *ses;
ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
se_perclnt);
list_del(&ses->se_perclnt);
WARN_ON_ONCE(atomic_read(&ses->se_ref));
free_session(ses);
}
rpc_destroy_wait_queue(&clp->cl_cb_waitq);
if (clp->cl_nfsd_dentry) {
nfsd_client_rmdir(clp->cl_nfsd_dentry);
clp->cl_nfsd_dentry = NULL;
wake_up_all(&expiry_wq);
}
drop_client(clp);
}
/* must be called under the client_lock */
static void
unhash_client_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
struct nfsd4_session *ses;
lockdep_assert_held(&nn->client_lock);
/* Mark the client as expired! */
clp->cl_time = 0;
/* Make it invisible */
if (!list_empty(&clp->cl_idhash)) {
list_del_init(&clp->cl_idhash);
if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
else
rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
}
list_del_init(&clp->cl_lru);
spin_lock(&clp->cl_lock);
list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
list_del_init(&ses->se_hash);
spin_unlock(&clp->cl_lock);
}
static void
unhash_client(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
spin_lock(&nn->client_lock);
unhash_client_locked(clp);
spin_unlock(&nn->client_lock);
}
static __be32 mark_client_expired_locked(struct nfs4_client *clp)
{
if (atomic_read(&clp->cl_rpc_users))
return nfserr_jukebox;
unhash_client_locked(clp);
return nfs_ok;
}
static void
__destroy_client(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
int i;
struct nfs4_openowner *oo;
struct nfs4_delegation *dp;
struct list_head reaplist;
INIT_LIST_HEAD(&reaplist);
spin_lock(&state_lock);
while (!list_empty(&clp->cl_delegations)) {
dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
WARN_ON(!unhash_delegation_locked(dp));
list_add(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&state_lock);
while (!list_empty(&reaplist)) {
dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
destroy_unhashed_deleg(dp);
}
while (!list_empty(&clp->cl_revoked)) {
dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
nfs4_put_stid(&dp->dl_stid);
}
while (!list_empty(&clp->cl_openowners)) {
oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
nfs4_get_stateowner(&oo->oo_owner);
release_openowner(oo);
}
for (i = 0; i < OWNER_HASH_SIZE; i++) {
struct nfs4_stateowner *so, *tmp;
list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
so_strhash) {
/* Should be no openowners at this point */
WARN_ON_ONCE(so->so_is_open_owner);
remove_blocked_locks(lockowner(so));
}
}
nfsd4_return_all_client_layouts(clp);
nfsd4_shutdown_copy(clp);
nfsd4_shutdown_callback(clp);
if (clp->cl_cb_conn.cb_xprt)
svc_xprt_put(clp->cl_cb_conn.cb_xprt);
atomic_add_unless(&nn->nfs4_client_count, -1, 0);
nfsd4_dec_courtesy_client_count(nn, clp);
free_client(clp);
wake_up_all(&expiry_wq);
}
static void
destroy_client(struct nfs4_client *clp)
{
unhash_client(clp);
__destroy_client(clp);
}
static void inc_reclaim_complete(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
if (!nn->track_reclaim_completes)
return;
if (!nfsd4_find_reclaim_client(clp->cl_name, nn))
return;
if (atomic_inc_return(&nn->nr_reclaim_complete) ==
nn->reclaim_str_hashtbl_size) {
printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
clp->net->ns.inum);
nfsd4_end_grace(nn);
}
}
static void expire_client(struct nfs4_client *clp)
{
unhash_client(clp);
nfsd4_client_record_remove(clp);
__destroy_client(clp);
}
static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
{
memcpy(target->cl_verifier.data, source->data,
sizeof(target->cl_verifier.data));
}
static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
{
target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
target->cl_clientid.cl_id = source->cl_clientid.cl_id;
}
static int copy_cred(struct svc_cred *target, struct svc_cred *source)
{
target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
target->cr_raw_principal = kstrdup(source->cr_raw_principal,
GFP_KERNEL);
target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL);
if ((source->cr_principal && !target->cr_principal) ||
(source->cr_raw_principal && !target->cr_raw_principal) ||
(source->cr_targ_princ && !target->cr_targ_princ))
return -ENOMEM;
target->cr_flavor = source->cr_flavor;
target->cr_uid = source->cr_uid;
target->cr_gid = source->cr_gid;
target->cr_group_info = source->cr_group_info;
get_group_info(target->cr_group_info);
target->cr_gss_mech = source->cr_gss_mech;
if (source->cr_gss_mech)
gss_mech_get(source->cr_gss_mech);
return 0;
}
static int
compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
{
if (o1->len < o2->len)
return -1;
if (o1->len > o2->len)
return 1;
return memcmp(o1->data, o2->data, o1->len);
}
static int
same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
{
return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
}
static int
same_clid(clientid_t *cl1, clientid_t *cl2)
{
return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
}
static bool groups_equal(struct group_info *g1, struct group_info *g2)
{
int i;
if (g1->ngroups != g2->ngroups)
return false;
for (i=0; i<g1->ngroups; i++)
if (!gid_eq(g1->gid[i], g2->gid[i]))
return false;
return true;
}
/*
* RFC 3530 language requires clid_inuse be returned when the
* "principal" associated with a requests differs from that previously
* used. We use uid, gid's, and gss principal string as our best
* approximation. We also don't want to allow non-gss use of a client
* established using gss: in theory cr_principal should catch that
* change, but in practice cr_principal can be null even in the gss case
* since gssd doesn't always pass down a principal string.
*/
static bool is_gss_cred(struct svc_cred *cr)
{
/* Is cr_flavor one of the gss "pseudoflavors"?: */
return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
}
static bool
same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
{
if ((is_gss_cred(cr1) != is_gss_cred(cr2))
|| (!uid_eq(cr1->cr_uid, cr2->cr_uid))
|| (!gid_eq(cr1->cr_gid, cr2->cr_gid))
|| !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
return false;
/* XXX: check that cr_targ_princ fields match ? */
if (cr1->cr_principal == cr2->cr_principal)
return true;
if (!cr1->cr_principal || !cr2->cr_principal)
return false;
return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
}
static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
{
struct svc_cred *cr = &rqstp->rq_cred;
u32 service;
if (!cr->cr_gss_mech)
return false;
service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
return service == RPC_GSS_SVC_INTEGRITY ||
service == RPC_GSS_SVC_PRIVACY;
}
bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
{
struct svc_cred *cr = &rqstp->rq_cred;
if (!cl->cl_mach_cred)
return true;
if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
return false;
if (!svc_rqst_integrity_protected(rqstp))
return false;
if (cl->cl_cred.cr_raw_principal)
return 0 == strcmp(cl->cl_cred.cr_raw_principal,
cr->cr_raw_principal);
if (!cr->cr_principal)
return false;
return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
}
static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
{
__be32 verf[2];
/*
* This is opaque to client, so no need to byte-swap. Use
* __force to keep sparse happy
*/
verf[0] = (__force __be32)(u32)ktime_get_real_seconds();
verf[1] = (__force __be32)nn->clverifier_counter++;
memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
}
static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
{
clp->cl_clientid.cl_boot = (u32)nn->boot_time;
clp->cl_clientid.cl_id = nn->clientid_counter++;
gen_confirm(clp, nn);
}
static struct nfs4_stid *
find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
{
struct nfs4_stid *ret;
ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
if (!ret || !ret->sc_type)
return NULL;
return ret;
}
static struct nfs4_stid *
find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
{
struct nfs4_stid *s;
spin_lock(&cl->cl_lock);
s = find_stateid_locked(cl, t);
if (s != NULL) {
if (typemask & s->sc_type)
refcount_inc(&s->sc_count);
else
s = NULL;
}
spin_unlock(&cl->cl_lock);
return s;
}
static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
{
struct nfsdfs_client *nc;
nc = get_nfsdfs_client(inode);
if (!nc)
return NULL;
return container_of(nc, struct nfs4_client, cl_nfsdfs);
}
static void seq_quote_mem(struct seq_file *m, char *data, int len)
{
seq_printf(m, "\"");
seq_escape_mem(m, data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, "\"\\");
seq_printf(m, "\"");
}
static const char *cb_state2str(int state)
{
switch (state) {
case NFSD4_CB_UP:
return "UP";
case NFSD4_CB_UNKNOWN:
return "UNKNOWN";
case NFSD4_CB_DOWN:
return "DOWN";
case NFSD4_CB_FAULT:
return "FAULT";
}
return "UNDEFINED";
}
static int client_info_show(struct seq_file *m, void *v)
{
struct inode *inode = file_inode(m->file);
struct nfs4_client *clp;
u64 clid;
clp = get_nfsdfs_clp(inode);
if (!clp)
return -ENXIO;
memcpy(&clid, &clp->cl_clientid, sizeof(clid));
seq_printf(m, "clientid: 0x%llx\n", clid);
seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
if (clp->cl_state == NFSD4_COURTESY)
seq_puts(m, "status: courtesy\n");
else if (clp->cl_state == NFSD4_EXPIRABLE)
seq_puts(m, "status: expirable\n");
else if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
seq_puts(m, "status: confirmed\n");
else
seq_puts(m, "status: unconfirmed\n");
seq_printf(m, "seconds from last renew: %lld\n",
ktime_get_boottime_seconds() - clp->cl_time);
seq_printf(m, "name: ");
seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
if (clp->cl_nii_domain.data) {
seq_printf(m, "Implementation domain: ");
seq_quote_mem(m, clp->cl_nii_domain.data,
clp->cl_nii_domain.len);
seq_printf(m, "\nImplementation name: ");
seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
}
seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
seq_printf(m, "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
drop_client(clp);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(client_info);
static void *states_start(struct seq_file *s, loff_t *pos)
__acquires(&clp->cl_lock)
{
struct nfs4_client *clp = s->private;
unsigned long id = *pos;
void *ret;
spin_lock(&clp->cl_lock);
ret = idr_get_next_ul(&clp->cl_stateids, &id);
*pos = id;
return ret;
}
static void *states_next(struct seq_file *s, void *v, loff_t *pos)
{
struct nfs4_client *clp = s->private;
unsigned long id = *pos;
void *ret;
id = *pos;
id++;
ret = idr_get_next_ul(&clp->cl_stateids, &id);
*pos = id;
return ret;
}
static void states_stop(struct seq_file *s, void *v)
__releases(&clp->cl_lock)
{
struct nfs4_client *clp = s->private;
spin_unlock(&clp->cl_lock);
}
static void nfs4_show_fname(struct seq_file *s, struct nfsd_file *f)
{
seq_printf(s, "filename: \"%pD2\"", f->nf_file);
}
static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
{
struct inode *inode = file_inode(f->nf_file);
seq_printf(s, "superblock: \"%02x:%02x:%ld\"",
MAJOR(inode->i_sb->s_dev),
MINOR(inode->i_sb->s_dev),
inode->i_ino);
}
static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
{
seq_printf(s, "owner: ");
seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len);
}
static void nfs4_show_stateid(struct seq_file *s, stateid_t *stid)
{
seq_printf(s, "0x%.8x", stid->si_generation);
seq_printf(s, "%12phN", &stid->si_opaque);
}
static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
{
struct nfs4_ol_stateid *ols;
struct nfs4_file *nf;
struct nfsd_file *file;
struct nfs4_stateowner *oo;
unsigned int access, deny;
if (st->sc_type != NFS4_OPEN_STID && st->sc_type != NFS4_LOCK_STID)
return 0; /* XXX: or SEQ_SKIP? */
ols = openlockstateid(st);
oo = ols->st_stateowner;
nf = st->sc_file;
spin_lock(&nf->fi_lock);
file = find_any_file_locked(nf);
if (!file)
goto out;
seq_printf(s, "- ");
nfs4_show_stateid(s, &st->sc_stateid);
seq_printf(s, ": { type: open, ");
access = bmap_to_share_mode(ols->st_access_bmap);
deny = bmap_to_share_mode(ols->st_deny_bmap);
seq_printf(s, "access: %s%s, ",
access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
seq_printf(s, "deny: %s%s, ",
deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
nfs4_show_superblock(s, file);
seq_printf(s, ", ");
nfs4_show_fname(s, file);
seq_printf(s, ", ");
nfs4_show_owner(s, oo);
seq_printf(s, " }\n");
out:
spin_unlock(&nf->fi_lock);
return 0;
}
static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
{
struct nfs4_ol_stateid *ols;
struct nfs4_file *nf;
struct nfsd_file *file;
struct nfs4_stateowner *oo;
ols = openlockstateid(st);
oo = ols->st_stateowner;
nf = st->sc_file;
spin_lock(&nf->fi_lock);
file = find_any_file_locked(nf);
if (!file)
goto out;
seq_printf(s, "- ");
nfs4_show_stateid(s, &st->sc_stateid);
seq_printf(s, ": { type: lock, ");
/*
* Note: a lock stateid isn't really the same thing as a lock,
* it's the locking state held by one owner on a file, and there
* may be multiple (or no) lock ranges associated with it.
* (Same for the matter is true of open stateids.)
*/
nfs4_show_superblock(s, file);
/* XXX: open stateid? */
seq_printf(s, ", ");
nfs4_show_fname(s, file);
seq_printf(s, ", ");
nfs4_show_owner(s, oo);
seq_printf(s, " }\n");
out:
spin_unlock(&nf->fi_lock);
return 0;
}
static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
{
struct nfs4_delegation *ds;
struct nfs4_file *nf;
struct nfsd_file *file;
ds = delegstateid(st);
nf = st->sc_file;
spin_lock(&nf->fi_lock);
file = nf->fi_deleg_file;
if (!file)
goto out;
seq_printf(s, "- ");
nfs4_show_stateid(s, &st->sc_stateid);
seq_printf(s, ": { type: deleg, ");
/* Kinda dead code as long as we only support read delegs: */
seq_printf(s, "access: %s, ",
ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
/* XXX: lease time, whether it's being recalled. */
nfs4_show_superblock(s, file);
seq_printf(s, ", ");
nfs4_show_fname(s, file);
seq_printf(s, " }\n");
out:
spin_unlock(&nf->fi_lock);
return 0;
}
static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
{
struct nfs4_layout_stateid *ls;
struct nfsd_file *file;
ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
file = ls->ls_file;
seq_printf(s, "- ");
nfs4_show_stateid(s, &st->sc_stateid);
seq_printf(s, ": { type: layout, ");
/* XXX: What else would be useful? */
nfs4_show_superblock(s, file);
seq_printf(s, ", ");
nfs4_show_fname(s, file);
seq_printf(s, " }\n");
return 0;
}
static int states_show(struct seq_file *s, void *v)
{
struct nfs4_stid *st = v;
switch (st->sc_type) {
case NFS4_OPEN_STID:
return nfs4_show_open(s, st);
case NFS4_LOCK_STID:
return nfs4_show_lock(s, st);
case NFS4_DELEG_STID:
return nfs4_show_deleg(s, st);
case NFS4_LAYOUT_STID:
return nfs4_show_layout(s, st);
default:
return 0; /* XXX: or SEQ_SKIP? */
}
/* XXX: copy stateids? */
}
static struct seq_operations states_seq_ops = {
.start = states_start,
.next = states_next,
.stop = states_stop,
.show = states_show
};
static int client_states_open(struct inode *inode, struct file *file)
{
struct seq_file *s;
struct nfs4_client *clp;
int ret;
clp = get_nfsdfs_clp(inode);
if (!clp)
return -ENXIO;
ret = seq_open(file, &states_seq_ops);
if (ret)
return ret;
s = file->private_data;
s->private = clp;
return 0;
}
static int client_opens_release(struct inode *inode, struct file *file)
{
struct seq_file *m = file->private_data;
struct nfs4_client *clp = m->private;
/* XXX: alternatively, we could get/drop in seq start/stop */
drop_client(clp);
return 0;
}
static const struct file_operations client_states_fops = {
.open = client_states_open,
.read = seq_read,
.llseek = seq_lseek,
.release = client_opens_release,
};
/*
* Normally we refuse to destroy clients that are in use, but here the
* administrator is telling us to just do it. We also want to wait
* so the caller has a guarantee that the client's locks are gone by
* the time the write returns:
*/
static void force_expire_client(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
bool already_expired;
trace_nfsd_clid_admin_expired(&clp->cl_clientid);
spin_lock(&nn->client_lock);
clp->cl_time = 0;
spin_unlock(&nn->client_lock);
wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
spin_lock(&nn->client_lock);
already_expired = list_empty(&clp->cl_lru);
if (!already_expired)
unhash_client_locked(clp);
spin_unlock(&nn->client_lock);
if (!already_expired)
expire_client(clp);
else
wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
}
static ssize_t client_ctl_write(struct file *file, const char __user *buf,
size_t size, loff_t *pos)
{
char *data;
struct nfs4_client *clp;
data = simple_transaction_get(file, buf, size);
if (IS_ERR(data))
return PTR_ERR(data);
if (size != 7 || 0 != memcmp(data, "expire\n", 7))
return -EINVAL;
clp = get_nfsdfs_clp(file_inode(file));
if (!clp)
return -ENXIO;
force_expire_client(clp);
drop_client(clp);
return 7;
}
static const struct file_operations client_ctl_fops = {
.write = client_ctl_write,
.release = simple_transaction_release,
};
static const struct tree_descr client_files[] = {
[0] = {"info", &client_info_fops, S_IRUSR},
[1] = {"states", &client_states_fops, S_IRUSR},
[2] = {"ctl", &client_ctl_fops, S_IWUSR},
[3] = {""},
};
static int
nfsd4_cb_recall_any_done(struct nfsd4_callback *cb,
struct rpc_task *task)
{
trace_nfsd_cb_recall_any_done(cb, task);
switch (task->tk_status) {
case -NFS4ERR_DELAY:
rpc_delay(task, 2 * HZ);
return 0;
default:
return 1;
}
}
static void
nfsd4_cb_recall_any_release(struct nfsd4_callback *cb)
{
struct nfs4_client *clp = cb->cb_clp;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
spin_lock(&nn->client_lock);
clear_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
put_client_renew_locked(clp);
spin_unlock(&nn->client_lock);
}
static const struct nfsd4_callback_ops nfsd4_cb_recall_any_ops = {
.done = nfsd4_cb_recall_any_done,
.release = nfsd4_cb_recall_any_release,
};
static struct nfs4_client *create_client(struct xdr_netobj name,
struct svc_rqst *rqstp, nfs4_verifier *verf)
{
struct nfs4_client *clp;
struct sockaddr *sa = svc_addr(rqstp);
int ret;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct dentry *dentries[ARRAY_SIZE(client_files)];
clp = alloc_client(name, nn);
if (clp == NULL)
return NULL;
ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
if (ret) {
free_client(clp);
return NULL;
}
gen_clid(clp, nn);
kref_init(&clp->cl_nfsdfs.cl_ref);
nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
clp->cl_time = ktime_get_boottime_seconds();
clear_bit(0, &clp->cl_cb_slot_busy);
copy_verf(clp, verf);
memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
clp->cl_cb_session = NULL;
clp->net = net;
clp->cl_nfsd_dentry = nfsd_client_mkdir(
nn, &clp->cl_nfsdfs,
clp->cl_clientid.cl_id - nn->clientid_base,
client_files, dentries);
clp->cl_nfsd_info_dentry = dentries[0];
if (!clp->cl_nfsd_dentry) {
free_client(clp);
return NULL;
}
clp->cl_ra = kzalloc(sizeof(*clp->cl_ra), GFP_KERNEL);
if (!clp->cl_ra) {
free_client(clp);
return NULL;
}
clp->cl_ra_time = 0;
nfsd4_init_cb(&clp->cl_ra->ra_cb, clp, &nfsd4_cb_recall_any_ops,
NFSPROC4_CLNT_CB_RECALL_ANY);
return clp;
}
static void
add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
{
struct rb_node **new = &(root->rb_node), *parent = NULL;
struct nfs4_client *clp;
while (*new) {
clp = rb_entry(*new, struct nfs4_client, cl_namenode);
parent = *new;
if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
new = &((*new)->rb_left);
else
new = &((*new)->rb_right);
}
rb_link_node(&new_clp->cl_namenode, parent, new);
rb_insert_color(&new_clp->cl_namenode, root);
}
static struct nfs4_client *
find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
{
int cmp;
struct rb_node *node = root->rb_node;
struct nfs4_client *clp;
while (node) {
clp = rb_entry(node, struct nfs4_client, cl_namenode);
cmp = compare_blob(&clp->cl_name, name);
if (cmp > 0)
node = node->rb_left;
else if (cmp < 0)
node = node->rb_right;
else
return clp;
}
return NULL;
}
static void
add_to_unconfirmed(struct nfs4_client *clp)
{
unsigned int idhashval;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
add_clp_to_name_tree(clp, &nn->unconf_name_tree);
idhashval = clientid_hashval(clp->cl_clientid.cl_id);
list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
renew_client_locked(clp);
}
static void
move_to_confirmed(struct nfs4_client *clp)
{
unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
add_clp_to_name_tree(clp, &nn->conf_name_tree);
set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
trace_nfsd_clid_confirmed(&clp->cl_clientid);
renew_client_locked(clp);
}
static struct nfs4_client *
find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
{
struct nfs4_client *clp;
unsigned int idhashval = clientid_hashval(clid->cl_id);
list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
if (same_clid(&clp->cl_clientid, clid)) {
if ((bool)clp->cl_minorversion != sessions)
return NULL;
renew_client_locked(clp);
return clp;
}
}
return NULL;
}
static struct nfs4_client *
find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
{
struct list_head *tbl = nn->conf_id_hashtbl;
lockdep_assert_held(&nn->client_lock);
return find_client_in_id_table(tbl, clid, sessions);
}
static struct nfs4_client *
find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
{
struct list_head *tbl = nn->unconf_id_hashtbl;
lockdep_assert_held(&nn->client_lock);
return find_client_in_id_table(tbl, clid, sessions);
}
static bool clp_used_exchangeid(struct nfs4_client *clp)
{
return clp->cl_exchange_flags != 0;
}
static struct nfs4_client *
find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
{
lockdep_assert_held(&nn->client_lock);
return find_clp_in_name_tree(name, &nn->conf_name_tree);
}
static struct nfs4_client *
find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
{
lockdep_assert_held(&nn->client_lock);
return find_clp_in_name_tree(name, &nn->unconf_name_tree);
}
static void
gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
{
struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
struct sockaddr *sa = svc_addr(rqstp);
u32 scopeid = rpc_get_scope_id(sa);
unsigned short expected_family;
/* Currently, we only support tcp and tcp6 for the callback channel */
if (se->se_callback_netid_len == 3 &&
!memcmp(se->se_callback_netid_val, "tcp", 3))
expected_family = AF_INET;
else if (se->se_callback_netid_len == 4 &&
!memcmp(se->se_callback_netid_val, "tcp6", 4))
expected_family = AF_INET6;
else
goto out_err;
conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
se->se_callback_addr_len,
(struct sockaddr *)&conn->cb_addr,
sizeof(conn->cb_addr));
if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
goto out_err;
if (conn->cb_addr.ss_family == AF_INET6)
((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
conn->cb_prog = se->se_callback_prog;
conn->cb_ident = se->se_callback_ident;
memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
trace_nfsd_cb_args(clp, conn);
return;
out_err:
conn->cb_addr.ss_family = AF_UNSPEC;
conn->cb_addrlen = 0;
trace_nfsd_cb_nodelegs(clp);
return;
}
/*
* Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
*/
static void
nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
{
struct xdr_buf *buf = resp->xdr->buf;
struct nfsd4_slot *slot = resp->cstate.slot;
unsigned int base;
dprintk("--> %s slot %p\n", __func__, slot);
slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
slot->sl_opcnt = resp->opcnt;
slot->sl_status = resp->cstate.status;
free_svc_cred(&slot->sl_cred);
copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
if (!nfsd4_cache_this(resp)) {
slot->sl_flags &= ~NFSD4_SLOT_CACHED;
return;
}
slot->sl_flags |= NFSD4_SLOT_CACHED;
base = resp->cstate.data_offset;
slot->sl_datalen = buf->len - base;
if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
WARN(1, "%s: sessions DRC could not cache compound\n",
__func__);
return;
}
/*
* Encode the replay sequence operation from the slot values.
* If cachethis is FALSE encode the uncached rep error on the next
* operation which sets resp->p and increments resp->opcnt for
* nfs4svc_encode_compoundres.
*
*/
static __be32
nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
struct nfsd4_compoundres *resp)
{
struct nfsd4_op *op;
struct nfsd4_slot *slot = resp->cstate.slot;
/* Encode the replayed sequence operation */
op = &args->ops[resp->opcnt - 1];
nfsd4_encode_operation(resp, op);
if (slot->sl_flags & NFSD4_SLOT_CACHED)
return op->status;
if (args->opcnt == 1) {
/*
* The original operation wasn't a solo sequence--we
* always cache those--so this retry must not match the
* original:
*/
op->status = nfserr_seq_false_retry;
} else {
op = &args->ops[resp->opcnt++];
op->status = nfserr_retry_uncached_rep;
nfsd4_encode_operation(resp, op);
}
return op->status;
}
/*
* The sequence operation is not cached because we can use the slot and
* session values.
*/
static __be32
nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
struct nfsd4_sequence *seq)
{
struct nfsd4_slot *slot = resp->cstate.slot;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
__be32 status;
dprintk("--> %s slot %p\n", __func__, slot);
status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
if (status)
return status;
p = xdr_reserve_space(xdr, slot->sl_datalen);
if (!p) {
WARN_ON_ONCE(1);
return nfserr_serverfault;
}
xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
xdr_commit_encode(xdr);
resp->opcnt = slot->sl_opcnt;
return slot->sl_status;
}
/*
* Set the exchange_id flags returned by the server.
*/
static void
nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
{
#ifdef CONFIG_NFSD_PNFS
new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
#else
new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
#endif
/* Referrals are supported, Migration is not. */
new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
/* set the wire flags to return to client. */
clid->flags = new->cl_exchange_flags;
}
static bool client_has_openowners(struct nfs4_client *clp)
{
struct nfs4_openowner *oo;
list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
if (!list_empty(&oo->oo_owner.so_stateids))
return true;
}
return false;
}
static bool client_has_state(struct nfs4_client *clp)
{
return client_has_openowners(clp)
#ifdef CONFIG_NFSD_PNFS
|| !list_empty(&clp->cl_lo_states)
#endif
|| !list_empty(&clp->cl_delegations)
|| !list_empty(&clp->cl_sessions)
|| !list_empty(&clp->async_copies);
}
static __be32 copy_impl_id(struct nfs4_client *clp,
struct nfsd4_exchange_id *exid)
{
if (!exid->nii_domain.data)
return 0;
xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
if (!clp->cl_nii_domain.data)
return nfserr_jukebox;
xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
if (!clp->cl_nii_name.data)
return nfserr_jukebox;
clp->cl_nii_time = exid->nii_time;
return 0;
}
__be32
nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_exchange_id *exid = &u->exchange_id;
struct nfs4_client *conf, *new;
struct nfs4_client *unconf = NULL;
__be32 status;
char addr_str[INET6_ADDRSTRLEN];
nfs4_verifier verf = exid->verifier;
struct sockaddr *sa = svc_addr(rqstp);
bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
rpc_ntop(sa, addr_str, sizeof(addr_str));
dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
"ip_addr=%s flags %x, spa_how %u\n",
__func__, rqstp, exid, exid->clname.len, exid->clname.data,
addr_str, exid->flags, exid->spa_how);
if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
return nfserr_inval;
new = create_client(exid->clname, rqstp, &verf);
if (new == NULL)
return nfserr_jukebox;
status = copy_impl_id(new, exid);
if (status)
goto out_nolock;
switch (exid->spa_how) {
case SP4_MACH_CRED:
exid->spo_must_enforce[0] = 0;
exid->spo_must_enforce[1] = (
1 << (OP_BIND_CONN_TO_SESSION - 32) |
1 << (OP_EXCHANGE_ID - 32) |
1 << (OP_CREATE_SESSION - 32) |
1 << (OP_DESTROY_SESSION - 32) |
1 << (OP_DESTROY_CLIENTID - 32));
exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
1 << (OP_OPEN_DOWNGRADE) |
1 << (OP_LOCKU) |
1 << (OP_DELEGRETURN));
exid->spo_must_allow[1] &= (
1 << (OP_TEST_STATEID - 32) |
1 << (OP_FREE_STATEID - 32));
if (!svc_rqst_integrity_protected(rqstp)) {
status = nfserr_inval;
goto out_nolock;
}
/*
* Sometimes userspace doesn't give us a principal.
* Which is a bug, really. Anyway, we can't enforce
* MACH_CRED in that case, better to give up now:
*/
if (!new->cl_cred.cr_principal &&
!new->cl_cred.cr_raw_principal) {
status = nfserr_serverfault;
goto out_nolock;
}
new->cl_mach_cred = true;
break;
case SP4_NONE:
break;
default: /* checked by xdr code */
WARN_ON_ONCE(1);
fallthrough;
case SP4_SSV:
status = nfserr_encr_alg_unsupp;
goto out_nolock;
}
/* Cases below refer to rfc 5661 section 18.35.4: */
spin_lock(&nn->client_lock);
conf = find_confirmed_client_by_name(&exid->clname, nn);
if (conf) {
bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
bool verfs_match = same_verf(&verf, &conf->cl_verifier);
if (update) {
if (!clp_used_exchangeid(conf)) { /* buggy client */
status = nfserr_inval;
goto out;
}
if (!nfsd4_mach_creds_match(conf, rqstp)) {
status = nfserr_wrong_cred;
goto out;
}
if (!creds_match) { /* case 9 */
status = nfserr_perm;
goto out;
}
if (!verfs_match) { /* case 8 */
status = nfserr_not_same;
goto out;
}
/* case 6 */
exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
trace_nfsd_clid_confirmed_r(conf);
goto out_copy;
}
if (!creds_match) { /* case 3 */
if (client_has_state(conf)) {
status = nfserr_clid_inuse;
trace_nfsd_clid_cred_mismatch(conf, rqstp);
goto out;
}
goto out_new;
}
if (verfs_match) { /* case 2 */
conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
trace_nfsd_clid_confirmed_r(conf);
goto out_copy;
}
/* case 5, client reboot */
trace_nfsd_clid_verf_mismatch(conf, rqstp, &verf);
conf = NULL;
goto out_new;
}
if (update) { /* case 7 */
status = nfserr_noent;
goto out;
}
unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
if (unconf) /* case 4, possible retry or client restart */
unhash_client_locked(unconf);
/* case 1, new owner ID */
trace_nfsd_clid_fresh(new);
out_new:
if (conf) {
status = mark_client_expired_locked(conf);
if (status)
goto out;
trace_nfsd_clid_replaced(&conf->cl_clientid);
}
new->cl_minorversion = cstate->minorversion;
new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
add_to_unconfirmed(new);
swap(new, conf);
out_copy:
exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
exid->clientid.cl_id = conf->cl_clientid.cl_id;
exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
nfsd4_set_ex_flags(conf, exid);
dprintk("nfsd4_exchange_id seqid %d flags %x\n",
conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
status = nfs_ok;
out:
spin_unlock(&nn->client_lock);
out_nolock:
if (new)
expire_client(new);
if (unconf) {
trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
expire_client(unconf);
}
return status;
}
static __be32
check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
{
dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
slot_seqid);
/* The slot is in use, and no response has been sent. */
if (slot_inuse) {
if (seqid == slot_seqid)
return nfserr_jukebox;
else
return nfserr_seq_misordered;
}
/* Note unsigned 32-bit arithmetic handles wraparound: */
if (likely(seqid == slot_seqid + 1))
return nfs_ok;
if (seqid == slot_seqid)
return nfserr_replay_cache;
return nfserr_seq_misordered;
}
/*
* Cache the create session result into the create session single DRC
* slot cache by saving the xdr structure. sl_seqid has been set.
* Do this for solo or embedded create session operations.
*/
static void
nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
struct nfsd4_clid_slot *slot, __be32 nfserr)
{
slot->sl_status = nfserr;
memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
}
static __be32
nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
struct nfsd4_clid_slot *slot)
{
memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
return slot->sl_status;
}
#define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1 + /* MIN tag is length with zero, only length */ \
3 + /* version, opcount, opcode */ \
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
/* seqid, slotID, slotID, cache */ \
4 ) * sizeof(__be32))
#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2 + /* verifier: AUTH_NULL, length 0 */\
1 + /* status */ \
1 + /* MIN tag is length with zero, only length */ \
3 + /* opcount, opcode, opstatus*/ \
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
/* seqid, slotID, slotID, slotID, status */ \
5 ) * sizeof(__be32))
static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
{
u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
return nfserr_toosmall;
if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
return nfserr_toosmall;
ca->headerpadsz = 0;
ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
/*
* Note decreasing slot size below client's request may make it
* difficult for client to function correctly, whereas
* decreasing the number of slots will (just?) affect
* performance. When short on memory we therefore prefer to
* decrease number of slots instead of their size. Clients that
* request larger slots than they need will get poor results:
* Note that we always allow at least one slot, because our
* accounting is soft and provides no guarantees either way.
*/
ca->maxreqs = nfsd4_get_drc_mem(ca, nn);
return nfs_ok;
}
/*
* Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
* These are based on similar macros in linux/sunrpc/msg_prot.h .
*/
#define RPC_MAX_HEADER_WITH_AUTH_SYS \
(RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
#define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
(RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
#define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
#define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
sizeof(__be32))
static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
{
ca->headerpadsz = 0;
if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
return nfserr_toosmall;
if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
return nfserr_toosmall;
ca->maxresp_cached = 0;
if (ca->maxops < 2)
return nfserr_toosmall;
return nfs_ok;
}
static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
{
switch (cbs->flavor) {
case RPC_AUTH_NULL:
case RPC_AUTH_UNIX:
return nfs_ok;
default:
/*
* GSS case: the spec doesn't allow us to return this
* error. But it also doesn't allow us not to support
* GSS.
* I'd rather this fail hard than return some error the
* client might think it can already handle:
*/
return nfserr_encr_alg_unsupp;
}
}
__be32
nfsd4_create_session(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
{
struct nfsd4_create_session *cr_ses = &u->create_session;
struct sockaddr *sa = svc_addr(rqstp);
struct nfs4_client *conf, *unconf;
struct nfs4_client *old = NULL;
struct nfsd4_session *new;
struct nfsd4_conn *conn;
struct nfsd4_clid_slot *cs_slot = NULL;
__be32 status = 0;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
return nfserr_inval;
status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
if (status)
return status;
status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
if (status)
return status;
status = check_backchannel_attrs(&cr_ses->back_channel);
if (status)
goto out_release_drc_mem;
status = nfserr_jukebox;
new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
if (!new)
goto out_release_drc_mem;
conn = alloc_conn_from_crses(rqstp, cr_ses);
if (!conn)
goto out_free_session;
spin_lock(&nn->client_lock);
unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
conf = find_confirmed_client(&cr_ses->clientid, true, nn);
WARN_ON_ONCE(conf && unconf);
if (conf) {
status = nfserr_wrong_cred;
if (!nfsd4_mach_creds_match(conf, rqstp))
goto out_free_conn;
cs_slot = &conf->cl_cs_slot;
status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
if (status) {
if (status == nfserr_replay_cache)
status = nfsd4_replay_create_session(cr_ses, cs_slot);
goto out_free_conn;
}
} else if (unconf) {
status = nfserr_clid_inuse;
if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
!rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
trace_nfsd_clid_cred_mismatch(unconf, rqstp);
goto out_free_conn;
}
status = nfserr_wrong_cred;
if (!nfsd4_mach_creds_match(unconf, rqstp))
goto out_free_conn;
cs_slot = &unconf->cl_cs_slot;
status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
if (status) {
/* an unconfirmed replay returns misordered */
status = nfserr_seq_misordered;
goto out_free_conn;
}
old = find_confirmed_client_by_name(&unconf->cl_name, nn);
if (old) {
status = mark_client_expired_locked(old);
if (status) {
old = NULL;
goto out_free_conn;
}
trace_nfsd_clid_replaced(&old->cl_clientid);
}
move_to_confirmed(unconf);
conf = unconf;
} else {
status = nfserr_stale_clientid;
goto out_free_conn;
}
status = nfs_ok;
/* Persistent sessions are not supported */
cr_ses->flags &= ~SESSION4_PERSIST;
/* Upshifting from TCP to RDMA is not supported */
cr_ses->flags &= ~SESSION4_RDMA;
init_session(rqstp, new, conf, cr_ses);
nfsd4_get_session_locked(new);
memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
NFS4_MAX_SESSIONID_LEN);
cs_slot->sl_seqid++;
cr_ses->seqid = cs_slot->sl_seqid;
/* cache solo and embedded create sessions under the client_lock */
nfsd4_cache_create_session(cr_ses, cs_slot, status);
spin_unlock(&nn->client_lock);
if (conf == unconf)
fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
/* init connection and backchannel */
nfsd4_init_conn(rqstp, conn, new);
nfsd4_put_session(new);
if (old)
expire_client(old);
return status;
out_free_conn:
spin_unlock(&nn->client_lock);
free_conn(conn);
if (old)
expire_client(old);
out_free_session:
__free_session(new);
out_release_drc_mem:
nfsd4_put_drc_mem(&cr_ses->fore_channel);
return status;
}
static __be32 nfsd4_map_bcts_dir(u32 *dir)
{
switch (*dir) {
case NFS4_CDFC4_FORE:
case NFS4_CDFC4_BACK:
return nfs_ok;
case NFS4_CDFC4_FORE_OR_BOTH:
case NFS4_CDFC4_BACK_OR_BOTH:
*dir = NFS4_CDFC4_BOTH;
return nfs_ok;
}
return nfserr_inval;
}
__be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
struct nfsd4_session *session = cstate->session;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
__be32 status;
status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
if (status)
return status;
spin_lock(&nn->client_lock);
session->se_cb_prog = bc->bc_cb_program;
session->se_cb_sec = bc->bc_cb_sec;
spin_unlock(&nn->client_lock);
nfsd4_probe_callback(session->se_client);
return nfs_ok;
}
static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
{
struct nfsd4_conn *c;
list_for_each_entry(c, &s->se_conns, cn_persession) {
if (c->cn_xprt == xpt) {
return c;
}
}
return NULL;
}
static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst,
struct nfsd4_session *session, u32 req, struct nfsd4_conn **conn)
{
struct nfs4_client *clp = session->se_client;
struct svc_xprt *xpt = rqst->rq_xprt;
struct nfsd4_conn *c;
__be32 status;
/* Following the last paragraph of RFC 5661 Section 18.34.3: */
spin_lock(&clp->cl_lock);
c = __nfsd4_find_conn(xpt, session);
if (!c)
status = nfserr_noent;
else if (req == c->cn_flags)
status = nfs_ok;
else if (req == NFS4_CDFC4_FORE_OR_BOTH &&
c->cn_flags != NFS4_CDFC4_BACK)
status = nfs_ok;
else if (req == NFS4_CDFC4_BACK_OR_BOTH &&
c->cn_flags != NFS4_CDFC4_FORE)
status = nfs_ok;
else
status = nfserr_inval;
spin_unlock(&clp->cl_lock);
if (status == nfs_ok && conn)
*conn = c;
return status;
}
__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
__be32 status;
struct nfsd4_conn *conn;
struct nfsd4_session *session;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
if (!nfsd4_last_compound_op(rqstp))
return nfserr_not_only_op;
spin_lock(&nn->client_lock);
session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
spin_unlock(&nn->client_lock);
if (!session)
goto out_no_session;
status = nfserr_wrong_cred;
if (!nfsd4_mach_creds_match(session->se_client, rqstp))
goto out;
status = nfsd4_match_existing_connection(rqstp, session,
bcts->dir, &conn);
if (status == nfs_ok) {
if (bcts->dir == NFS4_CDFC4_FORE_OR_BOTH ||
bcts->dir == NFS4_CDFC4_BACK)
conn->cn_flags |= NFS4_CDFC4_BACK;
nfsd4_probe_callback(session->se_client);
goto out;
}
if (status == nfserr_inval)
goto out;
status = nfsd4_map_bcts_dir(&bcts->dir);
if (status)
goto out;
conn = alloc_conn(rqstp, bcts->dir);
status = nfserr_jukebox;
if (!conn)
goto out;
nfsd4_init_conn(rqstp, conn, session);
status = nfs_ok;
out:
nfsd4_put_session(session);
out_no_session:
return status;
}
static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
{
if (!cstate->session)
return false;
return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid));
}
__be32
nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
struct nfsd4_session *ses;
__be32 status;
int ref_held_by_me = 0;
struct net *net = SVC_NET(r);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
status = nfserr_not_only_op;
if (nfsd4_compound_in_session(cstate, sessionid)) {
if (!nfsd4_last_compound_op(r))
goto out;
ref_held_by_me++;
}
dump_sessionid(__func__, sessionid);
spin_lock(&nn->client_lock);
ses = find_in_sessionid_hashtbl(sessionid, net, &status);
if (!ses)
goto out_client_lock;
status = nfserr_wrong_cred;
if (!nfsd4_mach_creds_match(ses->se_client, r))
goto out_put_session;
status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
if (status)
goto out_put_session;
unhash_session(ses);
spin_unlock(&nn->client_lock);
nfsd4_probe_callback_sync(ses->se_client);
spin_lock(&nn->client_lock);
status = nfs_ok;
out_put_session:
nfsd4_put_session_locked(ses);
out_client_lock:
spin_unlock(&nn->client_lock);
out:
return status;
}
static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd4_conn *c;
__be32 status = nfs_ok;
int ret;
spin_lock(&clp->cl_lock);
c = __nfsd4_find_conn(new->cn_xprt, ses);
if (c)
goto out_free;
status = nfserr_conn_not_bound_to_session;
if (clp->cl_mach_cred)
goto out_free;
__nfsd4_hash_conn(new, ses);
spin_unlock(&clp->cl_lock);
ret = nfsd4_register_conn(new);
if (ret)
/* oops; xprt is already down: */
nfsd4_conn_lost(&new->cn_xpt_user);
return nfs_ok;
out_free:
spin_unlock(&clp->cl_lock);
free_conn(new);
return status;
}
static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
{
struct nfsd4_compoundargs *args = rqstp->rq_argp;
return args->opcnt > session->se_fchannel.maxops;
}
static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
struct nfsd4_session *session)
{
struct xdr_buf *xb = &rqstp->rq_arg;
return xb->len > session->se_fchannel.maxreq_sz;
}
static bool replay_matches_cache(struct svc_rqst *rqstp,
struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
{
struct nfsd4_compoundargs *argp = rqstp->rq_argp;
if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
(bool)seq->cachethis)
return false;
/*
* If there's an error then the reply can have fewer ops than
* the call.
*/
if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
return false;
/*
* But if we cached a reply with *more* ops than the call you're
* sending us now, then this new call is clearly not really a
* replay of the old one:
*/
if (slot->sl_opcnt > argp->opcnt)
return false;
/* This is the only check explicitly called by spec: */
if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
return false;
/*
* There may be more comparisons we could actually do, but the
* spec doesn't require us to catch every case where the calls
* don't match (that would require caching the call as well as
* the reply), so we don't bother.
*/
return true;
}
__be32
nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_sequence *seq = &u->sequence;
struct nfsd4_compoundres *resp = rqstp->rq_resp;
struct xdr_stream *xdr = resp->xdr;
struct nfsd4_session *session;
struct nfs4_client *clp;
struct nfsd4_slot *slot;
struct nfsd4_conn *conn;
__be32 status;
int buflen;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
if (resp->opcnt != 1)
return nfserr_sequence_pos;
/*
* Will be either used or freed by nfsd4_sequence_check_conn
* below.
*/
conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
if (!conn)
return nfserr_jukebox;
spin_lock(&nn->client_lock);
session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
if (!session)
goto out_no_session;
clp = session->se_client;
status = nfserr_too_many_ops;
if (nfsd4_session_too_many_ops(rqstp, session))
goto out_put_session;
status = nfserr_req_too_big;
if (nfsd4_request_too_big(rqstp, session))
goto out_put_session;
status = nfserr_badslot;
if (seq->slotid >= session->se_fchannel.maxreqs)
goto out_put_session;
slot = session->se_slots[seq->slotid];
dprintk("%s: slotid %d\n", __func__, seq->slotid);
/* We do not negotiate the number of slots yet, so set the
* maxslots to the session maxreqs which is used to encode
* sr_highest_slotid and the sr_target_slot id to maxslots */
seq->maxslots = session->se_fchannel.maxreqs;
status = check_slot_seqid(seq->seqid, slot->sl_seqid,
slot->sl_flags & NFSD4_SLOT_INUSE);
if (status == nfserr_replay_cache) {
status = nfserr_seq_misordered;
if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
goto out_put_session;
status = nfserr_seq_false_retry;
if (!replay_matches_cache(rqstp, seq, slot))
goto out_put_session;
cstate->slot = slot;
cstate->session = session;
cstate->clp = clp;
/* Return the cached reply status and set cstate->status
* for nfsd4_proc_compound processing */
status = nfsd4_replay_cache_entry(resp, seq);
cstate->status = nfserr_replay_cache;
goto out;
}
if (status)
goto out_put_session;
status = nfsd4_sequence_check_conn(conn, session);
conn = NULL;
if (status)
goto out_put_session;
buflen = (seq->cachethis) ?
session->se_fchannel.maxresp_cached :
session->se_fchannel.maxresp_sz;
status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
nfserr_rep_too_big;
if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
goto out_put_session;
svc_reserve(rqstp, buflen);
status = nfs_ok;
/* Success! bump slot seqid */
slot->sl_seqid = seq->seqid;
slot->sl_flags |= NFSD4_SLOT_INUSE;
if (seq->cachethis)
slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
else
slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
cstate->slot = slot;
cstate->session = session;
cstate->clp = clp;
out:
switch (clp->cl_cb_state) {
case NFSD4_CB_DOWN:
seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
break;
case NFSD4_CB_FAULT:
seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
break;
default:
seq->status_flags = 0;
}
if (!list_empty(&clp->cl_revoked))
seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
out_no_session:
if (conn)
free_conn(conn);
spin_unlock(&nn->client_lock);
return status;
out_put_session:
nfsd4_put_session_locked(session);
goto out_no_session;
}
void
nfsd4_sequence_done(struct nfsd4_compoundres *resp)
{
struct nfsd4_compound_state *cs = &resp->cstate;
if (nfsd4_has_session(cs)) {
if (cs->status != nfserr_replay_cache) {
nfsd4_store_cache_entry(resp);
cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
}
/* Drop session reference that was taken in nfsd4_sequence() */
nfsd4_put_session(cs->session);
} else if (cs->clp)
put_client_renew(cs->clp);
}
__be32
nfsd4_destroy_clientid(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
struct nfs4_client *conf, *unconf;
struct nfs4_client *clp = NULL;
__be32 status = 0;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
spin_lock(&nn->client_lock);
unconf = find_unconfirmed_client(&dc->clientid, true, nn);
conf = find_confirmed_client(&dc->clientid, true, nn);
WARN_ON_ONCE(conf && unconf);
if (conf) {
if (client_has_state(conf)) {
status = nfserr_clientid_busy;
goto out;
}
status = mark_client_expired_locked(conf);
if (status)
goto out;
clp = conf;
} else if (unconf)
clp = unconf;
else {
status = nfserr_stale_clientid;
goto out;
}
if (!nfsd4_mach_creds_match(clp, rqstp)) {
clp = NULL;
status = nfserr_wrong_cred;
goto out;
}
trace_nfsd_clid_destroyed(&clp->cl_clientid);
unhash_client_locked(clp);
out:
spin_unlock(&nn->client_lock);
if (clp)
expire_client(clp);
return status;
}
__be32
nfsd4_reclaim_complete(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
{
struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
struct nfs4_client *clp = cstate->clp;
__be32 status = 0;
if (rc->rca_one_fs) {
if (!cstate->current_fh.fh_dentry)
return nfserr_nofilehandle;
/*
* We don't take advantage of the rca_one_fs case.
* That's OK, it's optional, we can safely ignore it.
*/
return nfs_ok;
}
status = nfserr_complete_already;
if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
goto out;
status = nfserr_stale_clientid;
if (is_client_expired(clp))
/*
* The following error isn't really legal.
* But we only get here if the client just explicitly
* destroyed the client. Surely it no longer cares what
* error it gets back on an operation for the dead
* client.
*/
goto out;
status = nfs_ok;
trace_nfsd_clid_reclaim_complete(&clp->cl_clientid);
nfsd4_client_record_create(clp);
inc_reclaim_complete(clp);
out:
return status;
}
__be32
nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_setclientid *setclid = &u->setclientid;
struct xdr_netobj clname = setclid->se_name;
nfs4_verifier clverifier = setclid->se_verf;
struct nfs4_client *conf, *new;
struct nfs4_client *unconf = NULL;
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
new = create_client(clname, rqstp, &clverifier);
if (new == NULL)
return nfserr_jukebox;
spin_lock(&nn->client_lock);
conf = find_confirmed_client_by_name(&clname, nn);
if (conf && client_has_state(conf)) {
status = nfserr_clid_inuse;
if (clp_used_exchangeid(conf))
goto out;
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
trace_nfsd_clid_cred_mismatch(conf, rqstp);
goto out;
}
}
unconf = find_unconfirmed_client_by_name(&clname, nn);
if (unconf)
unhash_client_locked(unconf);
if (conf) {
if (same_verf(&conf->cl_verifier, &clverifier)) {
copy_clid(new, conf);
gen_confirm(new, nn);
} else
trace_nfsd_clid_verf_mismatch(conf, rqstp,
&clverifier);
} else
trace_nfsd_clid_fresh(new);
new->cl_minorversion = 0;
gen_callback(new, setclid, rqstp);
add_to_unconfirmed(new);
setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
new = NULL;
status = nfs_ok;
out:
spin_unlock(&nn->client_lock);
if (new)
free_client(new);
if (unconf) {
trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
expire_client(unconf);
}
return status;
}
__be32
nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_setclientid_confirm *setclientid_confirm =
&u->setclientid_confirm;
struct nfs4_client *conf, *unconf;
struct nfs4_client *old = NULL;
nfs4_verifier confirm = setclientid_confirm->sc_confirm;
clientid_t * clid = &setclientid_confirm->sc_clientid;
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
if (STALE_CLIENTID(clid, nn))
return nfserr_stale_clientid;
spin_lock(&nn->client_lock);
conf = find_confirmed_client(clid, false, nn);
unconf = find_unconfirmed_client(clid, false, nn);
/*
* We try hard to give out unique clientid's, so if we get an
* attempt to confirm the same clientid with a different cred,
* the client may be buggy; this should never happen.
*
* Nevertheless, RFC 7530 recommends INUSE for this case:
*/
status = nfserr_clid_inuse;
if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
trace_nfsd_clid_cred_mismatch(unconf, rqstp);
goto out;
}
if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
trace_nfsd_clid_cred_mismatch(conf, rqstp);
goto out;
}
if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
if (conf && same_verf(&confirm, &conf->cl_confirm)) {
status = nfs_ok;
} else
status = nfserr_stale_clientid;
goto out;
}
status = nfs_ok;
if (conf) {
old = unconf;
unhash_client_locked(old);
nfsd4_change_callback(conf, &unconf->cl_cb_conn);
} else {
old = find_confirmed_client_by_name(&unconf->cl_name, nn);
if (old) {
status = nfserr_clid_inuse;
if (client_has_state(old)
&& !same_creds(&unconf->cl_cred,
&old->cl_cred)) {
old = NULL;
goto out;
}
status = mark_client_expired_locked(old);
if (status) {
old = NULL;
goto out;
}
trace_nfsd_clid_replaced(&old->cl_clientid);
}
move_to_confirmed(unconf);
conf = unconf;
}
get_client_locked(conf);
spin_unlock(&nn->client_lock);
if (conf == unconf)
fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
nfsd4_probe_callback(conf);
spin_lock(&nn->client_lock);
put_client_renew_locked(conf);
out:
spin_unlock(&nn->client_lock);
if (old)
expire_client(old);
return status;
}
static struct nfs4_file *nfsd4_alloc_file(void)
{
return kmem_cache_alloc(file_slab, GFP_KERNEL);
}
/* OPEN Share state helper functions */
static void nfsd4_file_init(const struct svc_fh *fh, struct nfs4_file *fp)
{
refcount_set(&fp->fi_ref, 1);
spin_lock_init(&fp->fi_lock);
INIT_LIST_HEAD(&fp->fi_stateids);
INIT_LIST_HEAD(&fp->fi_delegations);
INIT_LIST_HEAD(&fp->fi_clnt_odstate);
fh_copy_shallow(&fp->fi_fhandle, &fh->fh_handle);
fp->fi_deleg_file = NULL;
fp->fi_had_conflict = false;
fp->fi_share_deny = 0;
memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
memset(fp->fi_access, 0, sizeof(fp->fi_access));
fp->fi_aliased = false;
fp->fi_inode = d_inode(fh->fh_dentry);
#ifdef CONFIG_NFSD_PNFS
INIT_LIST_HEAD(&fp->fi_lo_states);
atomic_set(&fp->fi_lo_recalls, 0);
#endif
}
void
nfsd4_free_slabs(void)
{
kmem_cache_destroy(client_slab);
kmem_cache_destroy(openowner_slab);
kmem_cache_destroy(lockowner_slab);
kmem_cache_destroy(file_slab);
kmem_cache_destroy(stateid_slab);
kmem_cache_destroy(deleg_slab);
kmem_cache_destroy(odstate_slab);
}
int
nfsd4_init_slabs(void)
{
client_slab = kmem_cache_create("nfsd4_clients",
sizeof(struct nfs4_client), 0, 0, NULL);
if (client_slab == NULL)
goto out;
openowner_slab = kmem_cache_create("nfsd4_openowners",
sizeof(struct nfs4_openowner), 0, 0, NULL);
if (openowner_slab == NULL)
goto out_free_client_slab;
lockowner_slab = kmem_cache_create("nfsd4_lockowners",
sizeof(struct nfs4_lockowner), 0, 0, NULL);
if (lockowner_slab == NULL)
goto out_free_openowner_slab;
file_slab = kmem_cache_create("nfsd4_files",
sizeof(struct nfs4_file), 0, 0, NULL);
if (file_slab == NULL)
goto out_free_lockowner_slab;
stateid_slab = kmem_cache_create("nfsd4_stateids",
sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
if (stateid_slab == NULL)
goto out_free_file_slab;
deleg_slab = kmem_cache_create("nfsd4_delegations",
sizeof(struct nfs4_delegation), 0, 0, NULL);
if (deleg_slab == NULL)
goto out_free_stateid_slab;
odstate_slab = kmem_cache_create("nfsd4_odstate",
sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
if (odstate_slab == NULL)
goto out_free_deleg_slab;
return 0;
out_free_deleg_slab:
kmem_cache_destroy(deleg_slab);
out_free_stateid_slab:
kmem_cache_destroy(stateid_slab);
out_free_file_slab:
kmem_cache_destroy(file_slab);
out_free_lockowner_slab:
kmem_cache_destroy(lockowner_slab);
out_free_openowner_slab:
kmem_cache_destroy(openowner_slab);
out_free_client_slab:
kmem_cache_destroy(client_slab);
out:
return -ENOMEM;
}
static unsigned long
nfsd4_state_shrinker_count(struct shrinker *shrink, struct shrink_control *sc)
{
int count;
struct nfsd_net *nn = container_of(shrink,
struct nfsd_net, nfsd_client_shrinker);
count = atomic_read(&nn->nfsd_courtesy_clients);
if (!count)
count = atomic_long_read(&num_delegations);
if (count)
queue_work(laundry_wq, &nn->nfsd_shrinker_work);
return (unsigned long)count;
}
static unsigned long
nfsd4_state_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc)
{
return SHRINK_STOP;
}
void
nfsd4_init_leases_net(struct nfsd_net *nn)
{
struct sysinfo si;
u64 max_clients;
nn->nfsd4_lease = 90; /* default lease time */
nn->nfsd4_grace = 90;
nn->somebody_reclaimed = false;
nn->track_reclaim_completes = false;
nn->clverifier_counter = get_random_u32();
nn->clientid_base = get_random_u32();
nn->clientid_counter = nn->clientid_base + 1;
nn->s2s_cp_cl_id = nn->clientid_counter++;
atomic_set(&nn->nfs4_client_count, 0);
si_meminfo(&si);
max_clients = (u64)si.totalram * si.mem_unit / (1024 * 1024 * 1024);
max_clients *= NFS4_CLIENTS_PER_GB;
nn->nfs4_max_clients = max_t(int, max_clients, NFS4_CLIENTS_PER_GB);
atomic_set(&nn->nfsd_courtesy_clients, 0);
}
static void init_nfs4_replay(struct nfs4_replay *rp)
{
rp->rp_status = nfserr_serverfault;
rp->rp_buflen = 0;
rp->rp_buf = rp->rp_ibuf;
mutex_init(&rp->rp_mutex);
}
static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
struct nfs4_stateowner *so)
{
if (!nfsd4_has_session(cstate)) {
mutex_lock(&so->so_replay.rp_mutex);
cstate->replay_owner = nfs4_get_stateowner(so);
}
}
void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
{
struct nfs4_stateowner *so = cstate->replay_owner;
if (so != NULL) {
cstate->replay_owner = NULL;
mutex_unlock(&so->so_replay.rp_mutex);
nfs4_put_stateowner(so);
}
}
static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
{
struct nfs4_stateowner *sop;
sop = kmem_cache_alloc(slab, GFP_KERNEL);
if (!sop)
return NULL;
xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL);
if (!sop->so_owner.data) {
kmem_cache_free(slab, sop);
return NULL;
}
INIT_LIST_HEAD(&sop->so_stateids);
sop->so_client = clp;
init_nfs4_replay(&sop->so_replay);
atomic_set(&sop->so_count, 1);
return sop;
}
static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
{
lockdep_assert_held(&clp->cl_lock);
list_add(&oo->oo_owner.so_strhash,
&clp->cl_ownerstr_hashtbl[strhashval]);
list_add(&oo->oo_perclient, &clp->cl_openowners);
}
static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
{
unhash_openowner_locked(openowner(so));
}
static void nfs4_free_openowner(struct nfs4_stateowner *so)
{
struct nfs4_openowner *oo = openowner(so);
kmem_cache_free(openowner_slab, oo);
}
static const struct nfs4_stateowner_operations openowner_ops = {
.so_unhash = nfs4_unhash_openowner,
.so_free = nfs4_free_openowner,
};
static struct nfs4_ol_stateid *
nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
{
struct nfs4_ol_stateid *local, *ret = NULL;
struct nfs4_openowner *oo = open->op_openowner;
lockdep_assert_held(&fp->fi_lock);
list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
/* ignore lock owners */
if (local->st_stateowner->so_is_open_owner == 0)
continue;
if (local->st_stateowner != &oo->oo_owner)
continue;
if (local->st_stid.sc_type == NFS4_OPEN_STID) {
ret = local;
refcount_inc(&ret->st_stid.sc_count);
break;
}
}
return ret;
}
static __be32
nfsd4_verify_open_stid(struct nfs4_stid *s)
{
__be32 ret = nfs_ok;
switch (s->sc_type) {
default:
break;
case 0:
case NFS4_CLOSED_STID:
case NFS4_CLOSED_DELEG_STID:
ret = nfserr_bad_stateid;
break;
case NFS4_REVOKED_DELEG_STID:
ret = nfserr_deleg_revoked;
}
return ret;
}
/* Lock the stateid st_mutex, and deal with races with CLOSE */
static __be32
nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
{
__be32 ret;
mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
ret = nfsd4_verify_open_stid(&stp->st_stid);
if (ret != nfs_ok)
mutex_unlock(&stp->st_mutex);
return ret;
}
static struct nfs4_ol_stateid *
nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
{
struct nfs4_ol_stateid *stp;
for (;;) {
spin_lock(&fp->fi_lock);
stp = nfsd4_find_existing_open(fp, open);
spin_unlock(&fp->fi_lock);
if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
break;
nfs4_put_stid(&stp->st_stid);
}
return stp;
}
static struct nfs4_openowner *
alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
struct nfsd4_compound_state *cstate)
{
struct nfs4_client *clp = cstate->clp;
struct nfs4_openowner *oo, *ret;
oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
if (!oo)
return NULL;
oo->oo_owner.so_ops = &openowner_ops;
oo->oo_owner.so_is_open_owner = 1;
oo->oo_owner.so_seqid = open->op_seqid;
oo->oo_flags = 0;
if (nfsd4_has_session(cstate))
oo->oo_flags |= NFS4_OO_CONFIRMED;
oo->oo_time = 0;
oo->oo_last_closed_stid = NULL;
INIT_LIST_HEAD(&oo->oo_close_lru);
spin_lock(&clp->cl_lock);
ret = find_openstateowner_str_locked(strhashval, open, clp);
if (ret == NULL) {
hash_openowner(oo, clp, strhashval);
ret = oo;
} else
nfs4_free_stateowner(&oo->oo_owner);
spin_unlock(&clp->cl_lock);
return ret;
}
static struct nfs4_ol_stateid *
init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
{
struct nfs4_openowner *oo = open->op_openowner;
struct nfs4_ol_stateid *retstp = NULL;
struct nfs4_ol_stateid *stp;
stp = open->op_stp;
/* We are moving these outside of the spinlocks to avoid the warnings */
mutex_init(&stp->st_mutex);
mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
retry:
spin_lock(&oo->oo_owner.so_client->cl_lock);
spin_lock(&fp->fi_lock);
retstp = nfsd4_find_existing_open(fp, open);
if (retstp)
goto out_unlock;
open->op_stp = NULL;
refcount_inc(&stp->st_stid.sc_count);
stp->st_stid.sc_type = NFS4_OPEN_STID;
INIT_LIST_HEAD(&stp->st_locks);
stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
get_nfs4_file(fp);
stp->st_stid.sc_file = fp;
stp->st_access_bmap = 0;
stp->st_deny_bmap = 0;
stp->st_openstp = NULL;
list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
list_add(&stp->st_perfile, &fp->fi_stateids);
out_unlock:
spin_unlock(&fp->fi_lock);
spin_unlock(&oo->oo_owner.so_client->cl_lock);
if (retstp) {
/* Handle races with CLOSE */
if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
nfs4_put_stid(&retstp->st_stid);
goto retry;
}
/* To keep mutex tracking happy */
mutex_unlock(&stp->st_mutex);
stp = retstp;
}
return stp;
}
/*
* In the 4.0 case we need to keep the owners around a little while to handle
* CLOSE replay. We still do need to release any file access that is held by
* them before returning however.
*/
static void
move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
{
struct nfs4_ol_stateid *last;
struct nfs4_openowner *oo = openowner(s->st_stateowner);
struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
nfsd_net_id);
dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
/*
* We know that we hold one reference via nfsd4_close, and another
* "persistent" reference for the client. If the refcount is higher
* than 2, then there are still calls in progress that are using this
* stateid. We can't put the sc_file reference until they are finished.
* Wait for the refcount to drop to 2. Since it has been unhashed,
* there should be no danger of the refcount going back up again at
* this point.
*/
wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
release_all_access(s);
if (s->st_stid.sc_file) {
put_nfs4_file(s->st_stid.sc_file);
s->st_stid.sc_file = NULL;
}
spin_lock(&nn->client_lock);
last = oo->oo_last_closed_stid;
oo->oo_last_closed_stid = s;
list_move_tail(&oo->oo_close_lru, &nn->close_lru);
oo->oo_time = ktime_get_boottime_seconds();
spin_unlock(&nn->client_lock);
if (last)
nfs4_put_stid(&last->st_stid);
}
static noinline_for_stack struct nfs4_file *
nfsd4_file_hash_lookup(const struct svc_fh *fhp)
{
struct inode *inode = d_inode(fhp->fh_dentry);
struct rhlist_head *tmp, *list;
struct nfs4_file *fi;
rcu_read_lock();
list = rhltable_lookup(&nfs4_file_rhltable, &inode,
nfs4_file_rhash_params);
rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) {
if (refcount_inc_not_zero(&fi->fi_ref)) {
rcu_read_unlock();
return fi;
}
}
}
rcu_read_unlock();
return NULL;
}
/*
* On hash insertion, identify entries with the same inode but
* distinct filehandles. They will all be on the list returned
* by rhltable_lookup().
*
* inode->i_lock prevents racing insertions from adding an entry
* for the same inode/fhp pair twice.
*/
static noinline_for_stack struct nfs4_file *
nfsd4_file_hash_insert(struct nfs4_file *new, const struct svc_fh *fhp)
{
struct inode *inode = d_inode(fhp->fh_dentry);
struct rhlist_head *tmp, *list;
struct nfs4_file *ret = NULL;
bool alias_found = false;
struct nfs4_file *fi;
int err;
rcu_read_lock();
spin_lock(&inode->i_lock);
list = rhltable_lookup(&nfs4_file_rhltable, &inode,
nfs4_file_rhash_params);
rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) {
if (refcount_inc_not_zero(&fi->fi_ref))
ret = fi;
} else
fi->fi_aliased = alias_found = true;
}
if (ret)
goto out_unlock;
nfsd4_file_init(fhp, new);
err = rhltable_insert(&nfs4_file_rhltable, &new->fi_rlist,
nfs4_file_rhash_params);
if (err)
goto out_unlock;
new->fi_aliased = alias_found;
ret = new;
out_unlock:
spin_unlock(&inode->i_lock);
rcu_read_unlock();
return ret;
}
static noinline_for_stack void nfsd4_file_hash_remove(struct nfs4_file *fi)
{
rhltable_remove(&nfs4_file_rhltable, &fi->fi_rlist,
nfs4_file_rhash_params);
}
/*
* Called to check deny when READ with all zero stateid or
* WRITE with all zero or all one stateid
*/
static __be32
nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
{
struct nfs4_file *fp;
__be32 ret = nfs_ok;
fp = nfsd4_file_hash_lookup(current_fh);
if (!fp)
return ret;
/* Check for conflicting share reservations */
spin_lock(&fp->fi_lock);
if (fp->fi_share_deny & deny_type)
ret = nfserr_locked;
spin_unlock(&fp->fi_lock);
put_nfs4_file(fp);
return ret;
}
static bool nfsd4_deleg_present(const struct inode *inode)
{
struct file_lock_context *ctx = locks_inode_context(inode);
return ctx && !list_empty_careful(&ctx->flc_lease);
}
/**
* nfsd_wait_for_delegreturn - wait for delegations to be returned
* @rqstp: the RPC transaction being executed
* @inode: in-core inode of the file being waited for
*
* The timeout prevents deadlock if all nfsd threads happen to be
* tied up waiting for returning delegations.
*
* Return values:
* %true: delegation was returned
* %false: timed out waiting for delegreturn
*/
bool nfsd_wait_for_delegreturn(struct svc_rqst *rqstp, struct inode *inode)
{
long __maybe_unused timeo;
timeo = wait_var_event_timeout(inode, !nfsd4_deleg_present(inode),
NFSD_DELEGRETURN_TIMEOUT);
trace_nfsd_delegret_wakeup(rqstp, inode, timeo);
return timeo > 0;
}
static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
{
struct nfs4_delegation *dp = cb_to_delegation(cb);
struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
nfsd_net_id);
block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
/*
* We can't do this in nfsd_break_deleg_cb because it is
* already holding inode->i_lock.
*
* If the dl_time != 0, then we know that it has already been
* queued for a lease break. Don't queue it again.
*/
spin_lock(&state_lock);
if (delegation_hashed(dp) && dp->dl_time == 0) {
dp->dl_time = ktime_get_boottime_seconds();
list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
}
spin_unlock(&state_lock);
}
static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
struct rpc_task *task)
{
struct nfs4_delegation *dp = cb_to_delegation(cb);
trace_nfsd_cb_recall_done(&dp->dl_stid.sc_stateid, task);
if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID ||
dp->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID)
return 1;
switch (task->tk_status) {
case 0:
return 1;
case -NFS4ERR_DELAY:
rpc_delay(task, 2 * HZ);
return 0;
case -EBADHANDLE:
case -NFS4ERR_BAD_STATEID:
/*
* Race: client probably got cb_recall before open reply
* granting delegation.
*/
if (dp->dl_retries--) {
rpc_delay(task, 2 * HZ);
return 0;
}
fallthrough;
default:
return 1;
}
}
static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
{
struct nfs4_delegation *dp = cb_to_delegation(cb);
nfs4_put_stid(&dp->dl_stid);
}
static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
.prepare = nfsd4_cb_recall_prepare,
.done = nfsd4_cb_recall_done,
.release = nfsd4_cb_recall_release,
};
static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
{
/*
* We're assuming the state code never drops its reference
* without first removing the lease. Since we're in this lease
* callback (and since the lease code is serialized by the
* flc_lock) we know the server hasn't removed the lease yet, and
* we know it's safe to take a reference.
*/
refcount_inc(&dp->dl_stid.sc_count);
WARN_ON_ONCE(!nfsd4_run_cb(&dp->dl_recall));
}
/* Called from break_lease() with flc_lock held. */
static bool
nfsd_break_deleg_cb(struct file_lock *fl)
{
struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
struct nfs4_file *fp = dp->dl_stid.sc_file;
struct nfs4_client *clp = dp->dl_stid.sc_client;
struct nfsd_net *nn;
trace_nfsd_cb_recall(&dp->dl_stid);
dp->dl_recalled = true;
atomic_inc(&clp->cl_delegs_in_recall);
if (try_to_expire_client(clp)) {
nn = net_generic(clp->net, nfsd_net_id);
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
}
/*
* We don't want the locks code to timeout the lease for us;
* we'll remove it ourself if a delegation isn't returned
* in time:
*/
fl->fl_break_time = 0;
spin_lock(&fp->fi_lock);
fp->fi_had_conflict = true;
nfsd_break_one_deleg(dp);
spin_unlock(&fp->fi_lock);
return false;
}
/**
* nfsd_breaker_owns_lease - Check if lease conflict was resolved
* @fl: Lock state to check
*
* Return values:
* %true: Lease conflict was resolved
* %false: Lease conflict was not resolved.
*/
static bool nfsd_breaker_owns_lease(struct file_lock *fl)
{
struct nfs4_delegation *dl = fl->fl_owner;
struct svc_rqst *rqst;
struct nfs4_client *clp;
if (!i_am_nfsd())
return false;
rqst = kthread_data(current);
/* Note rq_prog == NFS_ACL_PROGRAM is also possible: */
if (rqst->rq_prog != NFS_PROGRAM || rqst->rq_vers < 4)
return false;
clp = *(rqst->rq_lease_breaker);
return dl->dl_stid.sc_client == clp;
}
static int
nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
struct list_head *dispose)
{
struct nfs4_delegation *dp = (struct nfs4_delegation *)onlist->fl_owner;
struct nfs4_client *clp = dp->dl_stid.sc_client;
if (arg & F_UNLCK) {
if (dp->dl_recalled)
atomic_dec(&clp->cl_delegs_in_recall);
return lease_modify(onlist, arg, dispose);
} else
return -EAGAIN;
}
static const struct lock_manager_operations nfsd_lease_mng_ops = {
.lm_breaker_owns_lease = nfsd_breaker_owns_lease,
.lm_break = nfsd_break_deleg_cb,
.lm_change = nfsd_change_deleg_cb,
};
static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
{
if (nfsd4_has_session(cstate))
return nfs_ok;
if (seqid == so->so_seqid - 1)
return nfserr_replay_me;
if (seqid == so->so_seqid)
return nfs_ok;
return nfserr_bad_seqid;
}
static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions,
struct nfsd_net *nn)
{
struct nfs4_client *found;
spin_lock(&nn->client_lock);
found = find_confirmed_client(clid, sessions, nn);
if (found)
atomic_inc(&found->cl_rpc_users);
spin_unlock(&nn->client_lock);
return found;
}
static __be32 set_client(clientid_t *clid,
struct nfsd4_compound_state *cstate,
struct nfsd_net *nn)
{
if (cstate->clp) {
if (!same_clid(&cstate->clp->cl_clientid, clid))
return nfserr_stale_clientid;
return nfs_ok;
}
if (STALE_CLIENTID(clid, nn))
return nfserr_stale_clientid;
/*
* We're in the 4.0 case (otherwise the SEQUENCE op would have
* set cstate->clp), so session = false:
*/
cstate->clp = lookup_clientid(clid, false, nn);
if (!cstate->clp)
return nfserr_expired;
return nfs_ok;
}
__be32
nfsd4_process_open1(struct nfsd4_compound_state *cstate,
struct nfsd4_open *open, struct nfsd_net *nn)
{
clientid_t *clientid = &open->op_clientid;
struct nfs4_client *clp = NULL;
unsigned int strhashval;
struct nfs4_openowner *oo = NULL;
__be32 status;
/*
* In case we need it later, after we've already created the
* file and don't want to risk a further failure:
*/
open->op_file = nfsd4_alloc_file();
if (open->op_file == NULL)
return nfserr_jukebox;
status = set_client(clientid, cstate, nn);
if (status)
return status;
clp = cstate->clp;
strhashval = ownerstr_hashval(&open->op_owner);
oo = find_openstateowner_str(strhashval, open, clp);
open->op_openowner = oo;
if (!oo) {
goto new_owner;
}
if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
/* Replace unconfirmed owners without checking for replay. */
release_openowner(oo);
open->op_openowner = NULL;
goto new_owner;
}
status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
if (status)
return status;
goto alloc_stateid;
new_owner:
oo = alloc_init_open_stateowner(strhashval, open, cstate);
if (oo == NULL)
return nfserr_jukebox;
open->op_openowner = oo;
alloc_stateid:
open->op_stp = nfs4_alloc_open_stateid(clp);
if (!open->op_stp)
return nfserr_jukebox;
if (nfsd4_has_session(cstate) &&
(cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
open->op_odstate = alloc_clnt_odstate(clp);
if (!open->op_odstate)
return nfserr_jukebox;
}
return nfs_ok;
}
static inline __be32
nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
{
if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
return nfserr_openmode;
else
return nfs_ok;
}
static int share_access_to_flags(u32 share_access)
{
return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
}
static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
{
struct nfs4_stid *ret;
ret = find_stateid_by_type(cl, s,
NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
if (!ret)
return NULL;
return delegstateid(ret);
}
static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
{
return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
}
static __be32
nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
struct nfs4_delegation **dp)
{
int flags;
__be32 status = nfserr_bad_stateid;
struct nfs4_delegation *deleg;
deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
if (deleg == NULL)
goto out;
if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
nfs4_put_stid(&deleg->dl_stid);
if (cl->cl_minorversion)
status = nfserr_deleg_revoked;
goto out;
}
flags = share_access_to_flags(open->op_share_access);
status = nfs4_check_delegmode(deleg, flags);
if (status) {
nfs4_put_stid(&deleg->dl_stid);
goto out;
}
*dp = deleg;
out:
if (!nfsd4_is_deleg_cur(open))
return nfs_ok;
if (status)
return status;
open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
return nfs_ok;
}
static inline int nfs4_access_to_access(u32 nfs4_access)
{
int flags = 0;
if (nfs4_access & NFS4_SHARE_ACCESS_READ)
flags |= NFSD_MAY_READ;
if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
flags |= NFSD_MAY_WRITE;
return flags;
}
static inline __be32
nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
struct nfsd4_open *open)
{
struct iattr iattr = {
.ia_valid = ATTR_SIZE,
.ia_size = 0,
};
struct nfsd_attrs attrs = {
.na_iattr = &iattr,
};
if (!open->op_truncate)
return 0;
if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
return nfserr_inval;
return nfsd_setattr(rqstp, fh, &attrs, 0, (time64_t)0);
}
static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
struct nfsd4_open *open, bool new_stp)
{
struct nfsd_file *nf = NULL;
__be32 status;
int oflag = nfs4_access_to_omode(open->op_share_access);
int access = nfs4_access_to_access(open->op_share_access);
unsigned char old_access_bmap, old_deny_bmap;
spin_lock(&fp->fi_lock);
/*
* Are we trying to set a deny mode that would conflict with
* current access?
*/
status = nfs4_file_check_deny(fp, open->op_share_deny);
if (status != nfs_ok) {
if (status != nfserr_share_denied) {
spin_unlock(&fp->fi_lock);
goto out;
}
if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
stp, open->op_share_deny, false))
status = nfserr_jukebox;
spin_unlock(&fp->fi_lock);
goto out;
}
/* set access to the file */
status = nfs4_file_get_access(fp, open->op_share_access);
if (status != nfs_ok) {
if (status != nfserr_share_denied) {
spin_unlock(&fp->fi_lock);
goto out;
}
if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
stp, open->op_share_access, true))
status = nfserr_jukebox;
spin_unlock(&fp->fi_lock);
goto out;
}
/* Set access bits in stateid */
old_access_bmap = stp->st_access_bmap;
set_access(open->op_share_access, stp);
/* Set new deny mask */
old_deny_bmap = stp->st_deny_bmap;
set_deny(open->op_share_deny, stp);
fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
if (!fp->fi_fds[oflag]) {
spin_unlock(&fp->fi_lock);
status = nfsd_file_acquire_opened(rqstp, cur_fh, access,
open->op_filp, &nf);
if (status != nfs_ok)
goto out_put_access;
spin_lock(&fp->fi_lock);
if (!fp->fi_fds[oflag]) {
fp->fi_fds[oflag] = nf;
nf = NULL;
}
}
spin_unlock(&fp->fi_lock);
if (nf)
nfsd_file_put(nf);
status = nfserrno(nfsd_open_break_lease(cur_fh->fh_dentry->d_inode,
access));
if (status)
goto out_put_access;
status = nfsd4_truncate(rqstp, cur_fh, open);
if (status)
goto out_put_access;
out:
return status;
out_put_access:
stp->st_access_bmap = old_access_bmap;
nfs4_file_put_access(fp, open->op_share_access);
reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
goto out;
}
static __be32
nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp,
struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
struct nfsd4_open *open)
{
__be32 status;
unsigned char old_deny_bmap = stp->st_deny_bmap;
if (!test_access(open->op_share_access, stp))
return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, false);
/* test and set deny mode */
spin_lock(&fp->fi_lock);
status = nfs4_file_check_deny(fp, open->op_share_deny);
switch (status) {
case nfs_ok:
set_deny(open->op_share_deny, stp);
fp->fi_share_deny |=
(open->op_share_deny & NFS4_SHARE_DENY_BOTH);
break;
case nfserr_share_denied:
if (nfs4_resolve_deny_conflicts_locked(fp, false,
stp, open->op_share_deny, false))
status = nfserr_jukebox;
break;
}
spin_unlock(&fp->fi_lock);
if (status != nfs_ok)
return status;
status = nfsd4_truncate(rqstp, cur_fh, open);
if (status != nfs_ok)
reset_union_bmap_deny(old_deny_bmap, stp);
return status;
}
/* Should we give out recallable state?: */
static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
{
if (clp->cl_cb_state == NFSD4_CB_UP)
return true;
/*
* In the sessions case, since we don't have to establish a
* separate connection for callbacks, we assume it's OK
* until we hear otherwise:
*/
return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
}
static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
int flag)
{
struct file_lock *fl;
fl = locks_alloc_lock();
if (!fl)
return NULL;
fl->fl_lmops = &nfsd_lease_mng_ops;
fl->fl_flags = FL_DELEG;
fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
fl->fl_end = OFFSET_MAX;
fl->fl_owner = (fl_owner_t)dp;
fl->fl_pid = current->tgid;
fl->fl_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
return fl;
}
static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
struct nfs4_file *fp)
{
struct nfs4_ol_stateid *st;
struct file *f = fp->fi_deleg_file->nf_file;
struct inode *ino = file_inode(f);
int writes;
writes = atomic_read(&ino->i_writecount);
if (!writes)
return 0;
/*
* There could be multiple filehandles (hence multiple
* nfs4_files) referencing this file, but that's not too
* common; let's just give up in that case rather than
* trying to go look up all the clients using that other
* nfs4_file as well:
*/
if (fp->fi_aliased)
return -EAGAIN;
/*
* If there's a close in progress, make sure that we see it
* clear any fi_fds[] entries before we see it decrement
* i_writecount:
*/
smp_mb__after_atomic();
if (fp->fi_fds[O_WRONLY])
writes--;
if (fp->fi_fds[O_RDWR])
writes--;
if (writes > 0)
return -EAGAIN; /* There may be non-NFSv4 writers */
/*
* It's possible there are non-NFSv4 write opens in progress,
* but if they haven't incremented i_writecount yet then they
* also haven't called break lease yet; so, they'll break this
* lease soon enough. So, all that's left to check for is NFSv4
* opens:
*/
spin_lock(&fp->fi_lock);
list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
if (st->st_openstp == NULL /* it's an open */ &&
access_permit_write(st) &&
st->st_stid.sc_client != clp) {
spin_unlock(&fp->fi_lock);
return -EAGAIN;
}
}
spin_unlock(&fp->fi_lock);
/*
* There's a small chance that we could be racing with another
* NFSv4 open. However, any open that hasn't added itself to
* the fi_stateids list also hasn't called break_lease yet; so,
* they'll break this lease soon enough.
*/
return 0;
}
/*
* It's possible that between opening the dentry and setting the delegation,
* that it has been renamed or unlinked. Redo the lookup to verify that this
* hasn't happened.
*/
static int
nfsd4_verify_deleg_dentry(struct nfsd4_open *open, struct nfs4_file *fp,
struct svc_fh *parent)
{
struct svc_export *exp;
struct dentry *child;
__be32 err;
err = nfsd_lookup_dentry(open->op_rqstp, parent,
open->op_fname, open->op_fnamelen,
&exp, &child);
if (err)
return -EAGAIN;
exp_put(exp);
dput(child);
if (child != file_dentry(fp->fi_deleg_file->nf_file))
return -EAGAIN;
return 0;
}
/*
* We avoid breaking delegations held by a client due to its own activity, but
* clearing setuid/setgid bits on a write is an implicit activity and the client
* may not notice and continue using the old mode. Avoid giving out a delegation
* on setuid/setgid files when the client is requesting an open for write.
*/
static int
nfsd4_verify_setuid_write(struct nfsd4_open *open, struct nfsd_file *nf)
{
struct inode *inode = file_inode(nf->nf_file);
if ((open->op_share_access & NFS4_SHARE_ACCESS_WRITE) &&
(inode->i_mode & (S_ISUID|S_ISGID)))
return -EAGAIN;
return 0;
}
static struct nfs4_delegation *
nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
struct svc_fh *parent)
{
int status = 0;
struct nfs4_client *clp = stp->st_stid.sc_client;
struct nfs4_file *fp = stp->st_stid.sc_file;
struct nfs4_clnt_odstate *odstate = stp->st_clnt_odstate;
struct nfs4_delegation *dp;
struct nfsd_file *nf = NULL;
struct file_lock *fl;
u32 dl_type;
/*
* The fi_had_conflict and nfs_get_existing_delegation checks
* here are just optimizations; we'll need to recheck them at
* the end:
*/
if (fp->fi_had_conflict)
return ERR_PTR(-EAGAIN);
/*
* Try for a write delegation first. RFC8881 section 10.4 says:
*
* "An OPEN_DELEGATE_WRITE delegation allows the client to handle,
* on its own, all opens."
*
* Furthermore the client can use a write delegation for most READ
* operations as well, so we require a O_RDWR file here.
*
* Offer a write delegation in the case of a BOTH open, and ensure
* we get the O_RDWR descriptor.
*/
if ((open->op_share_access & NFS4_SHARE_ACCESS_BOTH) == NFS4_SHARE_ACCESS_BOTH) {
nf = find_rw_file(fp);
dl_type = NFS4_OPEN_DELEGATE_WRITE;
}
/*
* If the file is being opened O_RDONLY or we couldn't get a O_RDWR
* file for some reason, then try for a read delegation instead.
*/
if (!nf && (open->op_share_access & NFS4_SHARE_ACCESS_READ)) {
nf = find_readable_file(fp);
dl_type = NFS4_OPEN_DELEGATE_READ;
}
if (!nf)
return ERR_PTR(-EAGAIN);
spin_lock(&state_lock);
spin_lock(&fp->fi_lock);
if (nfs4_delegation_exists(clp, fp))
status = -EAGAIN;
else if (nfsd4_verify_setuid_write(open, nf))
status = -EAGAIN;
else if (!fp->fi_deleg_file) {
fp->fi_deleg_file = nf;
/* increment early to prevent fi_deleg_file from being
* cleared */
fp->fi_delegees = 1;
nf = NULL;
} else
fp->fi_delegees++;
spin_unlock(&fp->fi_lock);
spin_unlock(&state_lock);
if (nf)
nfsd_file_put(nf);
if (status)
return ERR_PTR(status);
status = -ENOMEM;
dp = alloc_init_deleg(clp, fp, odstate, dl_type);
if (!dp)
goto out_delegees;
fl = nfs4_alloc_init_lease(dp, dl_type);
if (!fl)
goto out_clnt_odstate;
status = vfs_setlease(fp->fi_deleg_file->nf_file, fl->fl_type, &fl, NULL);
if (fl)
locks_free_lock(fl);
if (status)
goto out_clnt_odstate;
if (parent) {
status = nfsd4_verify_deleg_dentry(open, fp, parent);
if (status)
goto out_unlock;
}
status = nfsd4_check_conflicting_opens(clp, fp);
if (status)
goto out_unlock;
/*
* Now that the deleg is set, check again to ensure that nothing
* raced in and changed the mode while we weren't lookng.
*/
status = nfsd4_verify_setuid_write(open, fp->fi_deleg_file);
if (status)
goto out_unlock;
spin_lock(&state_lock);
spin_lock(&fp->fi_lock);
if (fp->fi_had_conflict)
status = -EAGAIN;
else
status = hash_delegation_locked(dp, fp);
spin_unlock(&fp->fi_lock);
spin_unlock(&state_lock);
if (status)
goto out_unlock;
return dp;
out_unlock:
vfs_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);
out_clnt_odstate:
put_clnt_odstate(dp->dl_clnt_odstate);
nfs4_put_stid(&dp->dl_stid);
out_delegees:
put_deleg_file(fp);
return ERR_PTR(status);
}
static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
{
open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
if (status == -EAGAIN)
open->op_why_no_deleg = WND4_CONTENTION;
else {
open->op_why_no_deleg = WND4_RESOURCE;
switch (open->op_deleg_want) {
case NFS4_SHARE_WANT_READ_DELEG:
case NFS4_SHARE_WANT_WRITE_DELEG:
case NFS4_SHARE_WANT_ANY_DELEG:
break;
case NFS4_SHARE_WANT_CANCEL:
open->op_why_no_deleg = WND4_CANCELLED;
break;
case NFS4_SHARE_WANT_NO_DELEG:
WARN_ON_ONCE(1);
}
}
}
/*
* The Linux NFS server does not offer write delegations to NFSv4.0
* clients in order to avoid conflicts between write delegations and
* GETATTRs requesting CHANGE or SIZE attributes.
*
* With NFSv4.1 and later minorversions, the SEQUENCE operation that
* begins each COMPOUND contains a client ID. Delegation recall can
* be avoided when the server recognizes the client sending a
* GETATTR also holds write delegation it conflicts with.
*
* However, the NFSv4.0 protocol does not enable a server to
* determine that a GETATTR originated from the client holding the
* conflicting delegation versus coming from some other client. Per
* RFC 7530 Section 16.7.5, the server must recall or send a
* CB_GETATTR even when the GETATTR originates from the client that
* holds the conflicting delegation.
*
* An NFSv4.0 client can trigger a pathological situation if it
* always sends a DELEGRETURN preceded by a conflicting GETATTR in
* the same COMPOUND. COMPOUND execution will always stop at the
* GETATTR and the DELEGRETURN will never get executed. The server
* eventually revokes the delegation, which can result in loss of
* open or lock state.
*/
static void
nfs4_open_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
struct svc_fh *currentfh)
{
struct nfs4_delegation *dp;
struct nfs4_openowner *oo = openowner(stp->st_stateowner);
struct nfs4_client *clp = stp->st_stid.sc_client;
struct svc_fh *parent = NULL;
int cb_up;
int status = 0;
cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
open->op_recall = 0;
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_PREVIOUS:
if (!cb_up)
open->op_recall = 1;
break;
case NFS4_OPEN_CLAIM_NULL:
parent = currentfh;
fallthrough;
case NFS4_OPEN_CLAIM_FH:
/*
* Let's not give out any delegations till everyone's
* had the chance to reclaim theirs, *and* until
* NLM locks have all been reclaimed:
*/
if (locks_in_grace(clp->net))
goto out_no_deleg;
if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
goto out_no_deleg;
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE &&
!clp->cl_minorversion)
goto out_no_deleg;
break;
default:
goto out_no_deleg;
}
dp = nfs4_set_delegation(open, stp, parent);
if (IS_ERR(dp))
goto out_no_deleg;
memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) {
open->op_delegate_type = NFS4_OPEN_DELEGATE_WRITE;
trace_nfsd_deleg_write(&dp->dl_stid.sc_stateid);
} else {
open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
trace_nfsd_deleg_read(&dp->dl_stid.sc_stateid);
}
nfs4_put_stid(&dp->dl_stid);
return;
out_no_deleg:
open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
dprintk("NFSD: WARNING: refusing delegation reclaim\n");
open->op_recall = 1;
}
/* 4.1 client asking for a delegation? */
if (open->op_deleg_want)
nfsd4_open_deleg_none_ext(open, status);
return;
}
static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
struct nfs4_delegation *dp)
{
if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
} else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
}
/* Otherwise the client must be confused wanting a delegation
* it already has, therefore we don't return
* NFS4_OPEN_DELEGATE_NONE_EXT and reason.
*/
}
/**
* nfsd4_process_open2 - finish open processing
* @rqstp: the RPC transaction being executed
* @current_fh: NFSv4 COMPOUND's current filehandle
* @open: OPEN arguments
*
* If successful, (1) truncate the file if open->op_truncate was
* set, (2) set open->op_stateid, (3) set open->op_delegation.
*
* Returns %nfs_ok on success; otherwise an nfs4stat value in
* network byte order is returned.
*/
__be32
nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
{
struct nfsd4_compoundres *resp = rqstp->rq_resp;
struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
struct nfs4_file *fp = NULL;
struct nfs4_ol_stateid *stp = NULL;
struct nfs4_delegation *dp = NULL;
__be32 status;
bool new_stp = false;
/*
* Lookup file; if found, lookup stateid and check open request,
* and check for delegations in the process of being recalled.
* If not found, create the nfs4_file struct
*/
fp = nfsd4_file_hash_insert(open->op_file, current_fh);
if (unlikely(!fp))
return nfserr_jukebox;
if (fp != open->op_file) {
status = nfs4_check_deleg(cl, open, &dp);
if (status)
goto out;
stp = nfsd4_find_and_lock_existing_open(fp, open);
} else {
open->op_file = NULL;
status = nfserr_bad_stateid;
if (nfsd4_is_deleg_cur(open))
goto out;
}
if (!stp) {
stp = init_open_stateid(fp, open);
if (!open->op_stp)
new_stp = true;
}
/*
* OPEN the file, or upgrade an existing OPEN.
* If truncate fails, the OPEN fails.
*
* stp is already locked.
*/
if (!new_stp) {
/* Stateid was found, this is an OPEN upgrade */
status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
if (status) {
mutex_unlock(&stp->st_mutex);
goto out;
}
} else {
status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true);
if (status) {
stp->st_stid.sc_type = NFS4_CLOSED_STID;
release_open_stateid(stp);
mutex_unlock(&stp->st_mutex);
goto out;
}
stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
open->op_odstate);
if (stp->st_clnt_odstate == open->op_odstate)
open->op_odstate = NULL;
}
nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
mutex_unlock(&stp->st_mutex);
if (nfsd4_has_session(&resp->cstate)) {
if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
open->op_why_no_deleg = WND4_NOT_WANTED;
goto nodeleg;
}
}
/*
* Attempt to hand out a delegation. No error return, because the
* OPEN succeeds even if we fail.
*/
nfs4_open_delegation(open, stp, &resp->cstate.current_fh);
nodeleg:
status = nfs_ok;
trace_nfsd_open(&stp->st_stid.sc_stateid);
out:
/* 4.1 client trying to upgrade/downgrade delegation? */
if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
open->op_deleg_want)
nfsd4_deleg_xgrade_none_ext(open, dp);
if (fp)
put_nfs4_file(fp);
if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
/*
* To finish the open response, we just need to set the rflags.
*/
open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
if (nfsd4_has_session(&resp->cstate))
open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
if (dp)
nfs4_put_stid(&dp->dl_stid);
if (stp)
nfs4_put_stid(&stp->st_stid);
return status;
}
void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
struct nfsd4_open *open)
{
if (open->op_openowner) {
struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
nfsd4_cstate_assign_replay(cstate, so);
nfs4_put_stateowner(so);
}
if (open->op_file)
kmem_cache_free(file_slab, open->op_file);
if (open->op_stp)
nfs4_put_stid(&open->op_stp->st_stid);
if (open->op_odstate)
kmem_cache_free(odstate_slab, open->op_odstate);
}
__be32
nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
clientid_t *clid = &u->renew;
struct nfs4_client *clp;
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
trace_nfsd_clid_renew(clid);
status = set_client(clid, cstate, nn);
if (status)
return status;
clp = cstate->clp;
if (!list_empty(&clp->cl_delegations)
&& clp->cl_cb_state != NFSD4_CB_UP)
return nfserr_cb_path_down;
return nfs_ok;
}
void
nfsd4_end_grace(struct nfsd_net *nn)
{
/* do nothing if grace period already ended */
if (nn->grace_ended)
return;
trace_nfsd_grace_complete(nn);
nn->grace_ended = true;
/*
* If the server goes down again right now, an NFSv4
* client will still be allowed to reclaim after it comes back up,
* even if it hasn't yet had a chance to reclaim state this time.
*
*/
nfsd4_record_grace_done(nn);
/*
* At this point, NFSv4 clients can still reclaim. But if the
* server crashes, any that have not yet reclaimed will be out
* of luck on the next boot.
*
* (NFSv4.1+ clients are considered to have reclaimed once they
* call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
* have reclaimed after their first OPEN.)
*/
locks_end_grace(&nn->nfsd4_manager);
/*
* At this point, and once lockd and/or any other containers
* exit their grace period, further reclaims will fail and
* regular locking can resume.
*/
}
/*
* If we've waited a lease period but there are still clients trying to
* reclaim, wait a little longer to give them a chance to finish.
*/
static bool clients_still_reclaiming(struct nfsd_net *nn)
{
time64_t double_grace_period_end = nn->boot_time +
2 * nn->nfsd4_lease;
if (nn->track_reclaim_completes &&
atomic_read(&nn->nr_reclaim_complete) ==
nn->reclaim_str_hashtbl_size)
return false;
if (!nn->somebody_reclaimed)
return false;
nn->somebody_reclaimed = false;
/*
* If we've given them *two* lease times to reclaim, and they're
* still not done, give up:
*/
if (ktime_get_boottime_seconds() > double_grace_period_end)
return false;
return true;
}
struct laundry_time {
time64_t cutoff;
time64_t new_timeo;
};
static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
{
time64_t time_remaining;
if (last_refresh < lt->cutoff)
return true;
time_remaining = last_refresh - lt->cutoff;
lt->new_timeo = min(lt->new_timeo, time_remaining);
return false;
}
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
void nfsd4_ssc_init_umount_work(struct nfsd_net *nn)
{
spin_lock_init(&nn->nfsd_ssc_lock);
INIT_LIST_HEAD(&nn->nfsd_ssc_mount_list);
init_waitqueue_head(&nn->nfsd_ssc_waitq);
}
EXPORT_SYMBOL_GPL(nfsd4_ssc_init_umount_work);
/*
* This is called when nfsd is being shutdown, after all inter_ssc
* cleanup were done, to destroy the ssc delayed unmount list.
*/
static void nfsd4_ssc_shutdown_umount(struct nfsd_net *nn)
{
struct nfsd4_ssc_umount_item *ni = NULL;
struct nfsd4_ssc_umount_item *tmp;
spin_lock(&nn->nfsd_ssc_lock);
list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
list_del(&ni->nsui_list);
spin_unlock(&nn->nfsd_ssc_lock);
mntput(ni->nsui_vfsmount);
kfree(ni);
spin_lock(&nn->nfsd_ssc_lock);
}
spin_unlock(&nn->nfsd_ssc_lock);
}
static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
{
bool do_wakeup = false;
struct nfsd4_ssc_umount_item *ni = NULL;
struct nfsd4_ssc_umount_item *tmp;
spin_lock(&nn->nfsd_ssc_lock);
list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
if (time_after(jiffies, ni->nsui_expire)) {
if (refcount_read(&ni->nsui_refcnt) > 1)
continue;
/* mark being unmount */
ni->nsui_busy = true;
spin_unlock(&nn->nfsd_ssc_lock);
mntput(ni->nsui_vfsmount);
spin_lock(&nn->nfsd_ssc_lock);
/* waiters need to start from begin of list */
list_del(&ni->nsui_list);
kfree(ni);
/* wakeup ssc_connect waiters */
do_wakeup = true;
continue;
}
break;
}
if (do_wakeup)
wake_up_all(&nn->nfsd_ssc_waitq);
spin_unlock(&nn->nfsd_ssc_lock);
}
#endif
/* Check if any lock belonging to this lockowner has any blockers */
static bool
nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo)
{
struct file_lock_context *ctx;
struct nfs4_ol_stateid *stp;
struct nfs4_file *nf;
list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
nf = stp->st_stid.sc_file;
ctx = locks_inode_context(nf->fi_inode);
if (!ctx)
continue;
if (locks_owner_has_blockers(ctx, lo))
return true;
}
return false;
}
static bool
nfs4_anylock_blockers(struct nfs4_client *clp)
{
int i;
struct nfs4_stateowner *so;
struct nfs4_lockowner *lo;
if (atomic_read(&clp->cl_delegs_in_recall))
return true;
spin_lock(&clp->cl_lock);
for (i = 0; i < OWNER_HASH_SIZE; i++) {
list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i],
so_strhash) {
if (so->so_is_open_owner)
continue;
lo = lockowner(so);
if (nfs4_lockowner_has_blockers(lo)) {
spin_unlock(&clp->cl_lock);
return true;
}
}
}
spin_unlock(&clp->cl_lock);
return false;
}
static void
nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist,
struct laundry_time *lt)
{
unsigned int maxreap, reapcnt = 0;
struct list_head *pos, *next;
struct nfs4_client *clp;
maxreap = (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) ?
NFSD_CLIENT_MAX_TRIM_PER_RUN : 0;
INIT_LIST_HEAD(reaplist);
spin_lock(&nn->client_lock);
list_for_each_safe(pos, next, &nn->client_lru) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
if (clp->cl_state == NFSD4_EXPIRABLE)
goto exp_client;
if (!state_expired(lt, clp->cl_time))
break;
if (!atomic_read(&clp->cl_rpc_users)) {
if (clp->cl_state == NFSD4_ACTIVE)
atomic_inc(&nn->nfsd_courtesy_clients);
clp->cl_state = NFSD4_COURTESY;
}
if (!client_has_state(clp))
goto exp_client;
if (!nfs4_anylock_blockers(clp))
if (reapcnt >= maxreap)
continue;
exp_client:
if (!mark_client_expired_locked(clp)) {
list_add(&clp->cl_lru, reaplist);
reapcnt++;
}
}
spin_unlock(&nn->client_lock);
}
static void
nfs4_get_courtesy_client_reaplist(struct nfsd_net *nn,
struct list_head *reaplist)
{
unsigned int maxreap = 0, reapcnt = 0;
struct list_head *pos, *next;
struct nfs4_client *clp;
maxreap = NFSD_CLIENT_MAX_TRIM_PER_RUN;
INIT_LIST_HEAD(reaplist);
spin_lock(&nn->client_lock);
list_for_each_safe(pos, next, &nn->client_lru) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
if (clp->cl_state == NFSD4_ACTIVE)
break;
if (reapcnt >= maxreap)
break;
if (!mark_client_expired_locked(clp)) {
list_add(&clp->cl_lru, reaplist);
reapcnt++;
}
}
spin_unlock(&nn->client_lock);
}
static void
nfs4_process_client_reaplist(struct list_head *reaplist)
{
struct list_head *pos, *next;
struct nfs4_client *clp;
list_for_each_safe(pos, next, reaplist) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
trace_nfsd_clid_purged(&clp->cl_clientid);
list_del_init(&clp->cl_lru);
expire_client(clp);
}
}
static time64_t
nfs4_laundromat(struct nfsd_net *nn)
{
struct nfs4_openowner *oo;
struct nfs4_delegation *dp;
struct nfs4_ol_stateid *stp;
struct nfsd4_blocked_lock *nbl;
struct list_head *pos, *next, reaplist;
struct laundry_time lt = {
.cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease,
.new_timeo = nn->nfsd4_lease
};
struct nfs4_cpntf_state *cps;
copy_stateid_t *cps_t;
int i;
if (clients_still_reclaiming(nn)) {
lt.new_timeo = 0;
goto out;
}
nfsd4_end_grace(nn);
spin_lock(&nn->s2s_cp_lock);
idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
if (cps->cp_stateid.cs_type == NFS4_COPYNOTIFY_STID &&
state_expired(&lt, cps->cpntf_time))
_free_cpntf_state_locked(nn, cps);
}
spin_unlock(&nn->s2s_cp_lock);
nfs4_get_client_reaplist(nn, &reaplist, &lt);
nfs4_process_client_reaplist(&reaplist);
spin_lock(&state_lock);
list_for_each_safe(pos, next, &nn->del_recall_lru) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
if (!state_expired(&lt, dp->dl_time))
break;
WARN_ON(!unhash_delegation_locked(dp));
list_add(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&state_lock);
while (!list_empty(&reaplist)) {
dp = list_first_entry(&reaplist, struct nfs4_delegation,
dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
revoke_delegation(dp);
}
spin_lock(&nn->client_lock);
while (!list_empty(&nn->close_lru)) {
oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
oo_close_lru);
if (!state_expired(&lt, oo->oo_time))
break;
list_del_init(&oo->oo_close_lru);
stp = oo->oo_last_closed_stid;
oo->oo_last_closed_stid = NULL;
spin_unlock(&nn->client_lock);
nfs4_put_stid(&stp->st_stid);
spin_lock(&nn->client_lock);
}
spin_unlock(&nn->client_lock);
/*
* It's possible for a client to try and acquire an already held lock
* that is being held for a long time, and then lose interest in it.
* So, we clean out any un-revisited request after a lease period
* under the assumption that the client is no longer interested.
*
* RFC5661, sec. 9.6 states that the client must not rely on getting
* notifications and must continue to poll for locks, even when the
* server supports them. Thus this shouldn't lead to clients blocking
* indefinitely once the lock does become free.
*/
BUG_ON(!list_empty(&reaplist));
spin_lock(&nn->blocked_locks_lock);
while (!list_empty(&nn->blocked_locks_lru)) {
nbl = list_first_entry(&nn->blocked_locks_lru,
struct nfsd4_blocked_lock, nbl_lru);
if (!state_expired(&lt, nbl->nbl_time))
break;
list_move(&nbl->nbl_lru, &reaplist);
list_del_init(&nbl->nbl_list);
}
spin_unlock(&nn->blocked_locks_lock);
while (!list_empty(&reaplist)) {
nbl = list_first_entry(&reaplist,
struct nfsd4_blocked_lock, nbl_lru);
list_del_init(&nbl->nbl_lru);
free_blocked_lock(nbl);
}
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
/* service the server-to-server copy delayed unmount list */
nfsd4_ssc_expire_umount(nn);
#endif
out:
return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
}
static void laundromat_main(struct work_struct *);
static void
laundromat_main(struct work_struct *laundry)
{
time64_t t;
struct delayed_work *dwork = to_delayed_work(laundry);
struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
laundromat_work);
t = nfs4_laundromat(nn);
queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
}
static void
courtesy_client_reaper(struct nfsd_net *nn)
{
struct list_head reaplist;
nfs4_get_courtesy_client_reaplist(nn, &reaplist);
nfs4_process_client_reaplist(&reaplist);
}
static void
deleg_reaper(struct nfsd_net *nn)
{
struct list_head *pos, *next;
struct nfs4_client *clp;
struct list_head cblist;
INIT_LIST_HEAD(&cblist);
spin_lock(&nn->client_lock);
list_for_each_safe(pos, next, &nn->client_lru) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
if (clp->cl_state != NFSD4_ACTIVE ||
list_empty(&clp->cl_delegations) ||
atomic_read(&clp->cl_delegs_in_recall) ||
test_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags) ||
(ktime_get_boottime_seconds() -
clp->cl_ra_time < 5)) {
continue;
}
list_add(&clp->cl_ra_cblist, &cblist);
/* release in nfsd4_cb_recall_any_release */
atomic_inc(&clp->cl_rpc_users);
set_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
clp->cl_ra_time = ktime_get_boottime_seconds();
}
spin_unlock(&nn->client_lock);
while (!list_empty(&cblist)) {
clp = list_first_entry(&cblist, struct nfs4_client,
cl_ra_cblist);
list_del_init(&clp->cl_ra_cblist);
clp->cl_ra->ra_keep = 0;
clp->cl_ra->ra_bmval[0] = BIT(RCA4_TYPE_MASK_RDATA_DLG);
trace_nfsd_cb_recall_any(clp->cl_ra);
nfsd4_run_cb(&clp->cl_ra->ra_cb);
}
}
static void
nfsd4_state_shrinker_worker(struct work_struct *work)
{
struct nfsd_net *nn = container_of(work, struct nfsd_net,
nfsd_shrinker_work);
courtesy_client_reaper(nn);
deleg_reaper(nn);
}
static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
{
if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
return nfserr_bad_stateid;
return nfs_ok;
}
static
__be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
{
__be32 status = nfserr_openmode;
/* For lock stateid's, we test the parent open, not the lock: */
if (stp->st_openstp)
stp = stp->st_openstp;
if ((flags & WR_STATE) && !access_permit_write(stp))
goto out;
if ((flags & RD_STATE) && !access_permit_read(stp))
goto out;
status = nfs_ok;
out:
return status;
}
static inline __be32
check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
{
if (ONE_STATEID(stateid) && (flags & RD_STATE))
return nfs_ok;
else if (opens_in_grace(net)) {
/* Answer in remaining cases depends on existence of
* conflicting state; so we must wait out the grace period. */
return nfserr_grace;
} else if (flags & WR_STATE)
return nfs4_share_conflict(current_fh,
NFS4_SHARE_DENY_WRITE);
else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
return nfs4_share_conflict(current_fh,
NFS4_SHARE_DENY_READ);
}
static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
{
/*
* When sessions are used the stateid generation number is ignored
* when it is zero.
*/
if (has_session && in->si_generation == 0)
return nfs_ok;
if (in->si_generation == ref->si_generation)
return nfs_ok;
/* If the client sends us a stateid from the future, it's buggy: */
if (nfsd4_stateid_generation_after(in, ref))
return nfserr_bad_stateid;
/*
* However, we could see a stateid from the past, even from a
* non-buggy client. For example, if the client sends a lock
* while some IO is outstanding, the lock may bump si_generation
* while the IO is still in flight. The client could avoid that
* situation by waiting for responses on all the IO requests,
* but better performance may result in retrying IO that
* receives an old_stateid error if requests are rarely
* reordered in flight:
*/
return nfserr_old_stateid;
}
static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
{
__be32 ret;
spin_lock(&s->sc_lock);
ret = nfsd4_verify_open_stid(s);
if (ret == nfs_ok)
ret = check_stateid_generation(in, &s->sc_stateid, has_session);
spin_unlock(&s->sc_lock);
return ret;
}
static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
{
if (ols->st_stateowner->so_is_open_owner &&
!(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
return nfserr_bad_stateid;
return nfs_ok;
}
static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
{
struct nfs4_stid *s;
__be32 status = nfserr_bad_stateid;
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
CLOSE_STATEID(stateid))
return status;
spin_lock(&cl->cl_lock);
s = find_stateid_locked(cl, stateid);
if (!s)
goto out_unlock;
status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
if (status)
goto out_unlock;
switch (s->sc_type) {
case NFS4_DELEG_STID:
status = nfs_ok;
break;
case NFS4_REVOKED_DELEG_STID:
status = nfserr_deleg_revoked;
break;
case NFS4_OPEN_STID:
case NFS4_LOCK_STID:
status = nfsd4_check_openowner_confirmed(openlockstateid(s));
break;
default:
printk("unknown stateid type %x\n", s->sc_type);
fallthrough;
case NFS4_CLOSED_STID:
case NFS4_CLOSED_DELEG_STID:
status = nfserr_bad_stateid;
}
out_unlock:
spin_unlock(&cl->cl_lock);
return status;
}
__be32
nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
stateid_t *stateid, unsigned char typemask,
struct nfs4_stid **s, struct nfsd_net *nn)
{
__be32 status;
struct nfs4_stid *stid;
bool return_revoked = false;
/*
* only return revoked delegations if explicitly asked.
* otherwise we report revoked or bad_stateid status.
*/
if (typemask & NFS4_REVOKED_DELEG_STID)
return_revoked = true;
else if (typemask & NFS4_DELEG_STID)
typemask |= NFS4_REVOKED_DELEG_STID;
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
CLOSE_STATEID(stateid))
return nfserr_bad_stateid;
status = set_client(&stateid->si_opaque.so_clid, cstate, nn);
if (status == nfserr_stale_clientid) {
if (cstate->session)
return nfserr_bad_stateid;
return nfserr_stale_stateid;
}
if (status)
return status;
stid = find_stateid_by_type(cstate->clp, stateid, typemask);
if (!stid)
return nfserr_bad_stateid;
if ((stid->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
nfs4_put_stid(stid);
if (cstate->minorversion)
return nfserr_deleg_revoked;
return nfserr_bad_stateid;
}
*s = stid;
return nfs_ok;
}
static struct nfsd_file *
nfs4_find_file(struct nfs4_stid *s, int flags)
{
struct nfsd_file *ret = NULL;
if (!s)
return NULL;
switch (s->sc_type) {
case NFS4_DELEG_STID:
spin_lock(&s->sc_file->fi_lock);
ret = nfsd_file_get(s->sc_file->fi_deleg_file);
spin_unlock(&s->sc_file->fi_lock);
break;
case NFS4_OPEN_STID:
case NFS4_LOCK_STID:
if (flags & RD_STATE)
ret = find_readable_file(s->sc_file);
else
ret = find_writeable_file(s->sc_file);
}
return ret;
}
static __be32
nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
{
__be32 status;
status = nfsd4_check_openowner_confirmed(ols);
if (status)
return status;
return nfs4_check_openmode(ols, flags);
}
static __be32
nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
struct nfsd_file **nfp, int flags)
{
int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
struct nfsd_file *nf;
__be32 status;
nf = nfs4_find_file(s, flags);
if (nf) {
status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
acc | NFSD_MAY_OWNER_OVERRIDE);
if (status) {
nfsd_file_put(nf);
goto out;
}
} else {
status = nfsd_file_acquire(rqstp, fhp, acc, &nf);
if (status)
return status;
}
*nfp = nf;
out:
return status;
}
static void
_free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
{
WARN_ON_ONCE(cps->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID);
if (!refcount_dec_and_test(&cps->cp_stateid.cs_count))
return;
list_del(&cps->cp_list);
idr_remove(&nn->s2s_cp_stateids,
cps->cp_stateid.cs_stid.si_opaque.so_id);
kfree(cps);
}
/*
* A READ from an inter server to server COPY will have a
* copy stateid. Look up the copy notify stateid from the
* idr structure and take a reference on it.
*/
__be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
struct nfs4_client *clp,
struct nfs4_cpntf_state **cps)
{
copy_stateid_t *cps_t;
struct nfs4_cpntf_state *state = NULL;
if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
return nfserr_bad_stateid;
spin_lock(&nn->s2s_cp_lock);
cps_t = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id);
if (cps_t) {
state = container_of(cps_t, struct nfs4_cpntf_state,
cp_stateid);
if (state->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID) {
state = NULL;
goto unlock;
}
if (!clp)
refcount_inc(&state->cp_stateid.cs_count);
else
_free_cpntf_state_locked(nn, state);
}
unlock:
spin_unlock(&nn->s2s_cp_lock);
if (!state)
return nfserr_bad_stateid;
if (!clp && state)
*cps = state;
return 0;
}
static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
struct nfs4_stid **stid)
{
__be32 status;
struct nfs4_cpntf_state *cps = NULL;
struct nfs4_client *found;
status = manage_cpntf_state(nn, st, NULL, &cps);
if (status)
return status;
cps->cpntf_time = ktime_get_boottime_seconds();
status = nfserr_expired;
found = lookup_clientid(&cps->cp_p_clid, true, nn);
if (!found)
goto out;
*stid = find_stateid_by_type(found, &cps->cp_p_stateid,
NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID);
if (*stid)
status = nfs_ok;
else
status = nfserr_bad_stateid;
put_client_renew(found);
out:
nfs4_put_cpntf_state(nn, cps);
return status;
}
void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
{
spin_lock(&nn->s2s_cp_lock);
_free_cpntf_state_locked(nn, cps);
spin_unlock(&nn->s2s_cp_lock);
}
/**
* nfs4_preprocess_stateid_op - find and prep stateid for an operation
* @rqstp: incoming request from client
* @cstate: current compound state
* @fhp: filehandle associated with requested stateid
* @stateid: stateid (provided by client)
* @flags: flags describing type of operation to be done
* @nfp: optional nfsd_file return pointer (may be NULL)
* @cstid: optional returned nfs4_stid pointer (may be NULL)
*
* Given info from the client, look up a nfs4_stid for the operation. On
* success, it returns a reference to the nfs4_stid and/or the nfsd_file
* associated with it.
*/
__be32
nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
stateid_t *stateid, int flags, struct nfsd_file **nfp,
struct nfs4_stid **cstid)
{
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct nfs4_stid *s = NULL;
__be32 status;
if (nfp)
*nfp = NULL;
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
if (cstid)
status = nfserr_bad_stateid;
else
status = check_special_stateids(net, fhp, stateid,
flags);
goto done;
}
status = nfsd4_lookup_stateid(cstate, stateid,
NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
&s, nn);
if (status == nfserr_bad_stateid)
status = find_cpntf_state(nn, stateid, &s);
if (status)
return status;
status = nfsd4_stid_check_stateid_generation(stateid, s,
nfsd4_has_session(cstate));
if (status)
goto out;
switch (s->sc_type) {
case NFS4_DELEG_STID:
status = nfs4_check_delegmode(delegstateid(s), flags);
break;
case NFS4_OPEN_STID:
case NFS4_LOCK_STID:
status = nfs4_check_olstateid(openlockstateid(s), flags);
break;
default:
status = nfserr_bad_stateid;
break;
}
if (status)
goto out;
status = nfs4_check_fh(fhp, s);
done:
if (status == nfs_ok && nfp)
status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
out:
if (s) {
if (!status && cstid)
*cstid = s;
else
nfs4_put_stid(s);
}
return status;
}
/*
* Test if the stateid is valid
*/
__be32
nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
struct nfsd4_test_stateid_id *stateid;
struct nfs4_client *cl = cstate->clp;
list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
stateid->ts_id_status =
nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
return nfs_ok;
}
static __be32
nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
{
struct nfs4_ol_stateid *stp = openlockstateid(s);
__be32 ret;
ret = nfsd4_lock_ol_stateid(stp);
if (ret)
goto out_put_stid;
ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
if (ret)
goto out;
ret = nfserr_locks_held;
if (check_for_locks(stp->st_stid.sc_file,
lockowner(stp->st_stateowner)))
goto out;
release_lock_stateid(stp);
ret = nfs_ok;
out:
mutex_unlock(&stp->st_mutex);
out_put_stid:
nfs4_put_stid(s);
return ret;
}
__be32
nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
stateid_t *stateid = &free_stateid->fr_stateid;
struct nfs4_stid *s;
struct nfs4_delegation *dp;
struct nfs4_client *cl = cstate->clp;
__be32 ret = nfserr_bad_stateid;
spin_lock(&cl->cl_lock);
s = find_stateid_locked(cl, stateid);
if (!s)
goto out_unlock;
spin_lock(&s->sc_lock);
switch (s->sc_type) {
case NFS4_DELEG_STID:
ret = nfserr_locks_held;
break;
case NFS4_OPEN_STID:
ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
if (ret)
break;
ret = nfserr_locks_held;
break;
case NFS4_LOCK_STID:
spin_unlock(&s->sc_lock);
refcount_inc(&s->sc_count);
spin_unlock(&cl->cl_lock);
ret = nfsd4_free_lock_stateid(stateid, s);
goto out;
case NFS4_REVOKED_DELEG_STID:
spin_unlock(&s->sc_lock);
dp = delegstateid(s);
list_del_init(&dp->dl_recall_lru);
spin_unlock(&cl->cl_lock);
nfs4_put_stid(s);
ret = nfs_ok;
goto out;
/* Default falls through and returns nfserr_bad_stateid */
}
spin_unlock(&s->sc_lock);
out_unlock:
spin_unlock(&cl->cl_lock);
out:
return ret;
}
static inline int
setlkflg (int type)
{
return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
RD_STATE : WR_STATE;
}
static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
{
struct svc_fh *current_fh = &cstate->current_fh;
struct nfs4_stateowner *sop = stp->st_stateowner;
__be32 status;
status = nfsd4_check_seqid(cstate, sop, seqid);
if (status)
return status;
status = nfsd4_lock_ol_stateid(stp);
if (status != nfs_ok)
return status;
status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
if (status == nfs_ok)
status = nfs4_check_fh(current_fh, &stp->st_stid);
if (status != nfs_ok)
mutex_unlock(&stp->st_mutex);
return status;
}
/**
* nfs4_preprocess_seqid_op - find and prep an ol_stateid for a seqid-morphing op
* @cstate: compund state
* @seqid: seqid (provided by client)
* @stateid: stateid (provided by client)
* @typemask: mask of allowable types for this operation
* @stpp: return pointer for the stateid found
* @nn: net namespace for request
*
* Given a stateid+seqid from a client, look up an nfs4_ol_stateid and
* return it in @stpp. On a nfs_ok return, the returned stateid will
* have its st_mutex locked.
*/
static __be32
nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
stateid_t *stateid, char typemask,
struct nfs4_ol_stateid **stpp,
struct nfsd_net *nn)
{
__be32 status;
struct nfs4_stid *s;
struct nfs4_ol_stateid *stp = NULL;
trace_nfsd_preprocess(seqid, stateid);
*stpp = NULL;
status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
if (status)
return status;
stp = openlockstateid(s);
nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
if (!status)
*stpp = stp;
else
nfs4_put_stid(&stp->st_stid);
return status;
}
static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
{
__be32 status;
struct nfs4_openowner *oo;
struct nfs4_ol_stateid *stp;
status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
NFS4_OPEN_STID, &stp, nn);
if (status)
return status;
oo = openowner(stp->st_stateowner);
if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
mutex_unlock(&stp->st_mutex);
nfs4_put_stid(&stp->st_stid);
return nfserr_bad_stateid;
}
*stpp = stp;
return nfs_ok;
}
__be32
nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_open_confirm *oc = &u->open_confirm;
__be32 status;
struct nfs4_openowner *oo;
struct nfs4_ol_stateid *stp;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
cstate->current_fh.fh_dentry);
status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
if (status)
return status;
status = nfs4_preprocess_seqid_op(cstate,
oc->oc_seqid, &oc->oc_req_stateid,
NFS4_OPEN_STID, &stp, nn);
if (status)
goto out;
oo = openowner(stp->st_stateowner);
status = nfserr_bad_stateid;
if (oo->oo_flags & NFS4_OO_CONFIRMED) {
mutex_unlock(&stp->st_mutex);
goto put_stateid;
}
oo->oo_flags |= NFS4_OO_CONFIRMED;
nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
mutex_unlock(&stp->st_mutex);
trace_nfsd_open_confirm(oc->oc_seqid, &stp->st_stid.sc_stateid);
nfsd4_client_record_create(oo->oo_owner.so_client);
status = nfs_ok;
put_stateid:
nfs4_put_stid(&stp->st_stid);
out:
nfsd4_bump_seqid(cstate, status);
return status;
}
static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
{
if (!test_access(access, stp))
return;
nfs4_file_put_access(stp->st_stid.sc_file, access);
clear_access(access, stp);
}
static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
{
switch (to_access) {
case NFS4_SHARE_ACCESS_READ:
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
break;
case NFS4_SHARE_ACCESS_WRITE:
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
break;
case NFS4_SHARE_ACCESS_BOTH:
break;
default:
WARN_ON_ONCE(1);
}
}
__be32
nfsd4_open_downgrade(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
{
struct nfsd4_open_downgrade *od = &u->open_downgrade;
__be32 status;
struct nfs4_ol_stateid *stp;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
cstate->current_fh.fh_dentry);
/* We don't yet support WANT bits: */
if (od->od_deleg_want)
dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
od->od_deleg_want);
status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
&od->od_stateid, &stp, nn);
if (status)
goto out;
status = nfserr_inval;
if (!test_access(od->od_share_access, stp)) {
dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
stp->st_access_bmap, od->od_share_access);
goto put_stateid;
}
if (!test_deny(od->od_share_deny, stp)) {
dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
stp->st_deny_bmap, od->od_share_deny);
goto put_stateid;
}
nfs4_stateid_downgrade(stp, od->od_share_access);
reset_union_bmap_deny(od->od_share_deny, stp);
nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
status = nfs_ok;
put_stateid:
mutex_unlock(&stp->st_mutex);
nfs4_put_stid(&stp->st_stid);
out:
nfsd4_bump_seqid(cstate, status);
return status;
}
static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
{
struct nfs4_client *clp = s->st_stid.sc_client;
bool unhashed;
LIST_HEAD(reaplist);
struct nfs4_ol_stateid *stp;
spin_lock(&clp->cl_lock);
unhashed = unhash_open_stateid(s, &reaplist);
if (clp->cl_minorversion) {
if (unhashed)
put_ol_stateid_locked(s, &reaplist);
spin_unlock(&clp->cl_lock);
list_for_each_entry(stp, &reaplist, st_locks)
nfs4_free_cpntf_statelist(clp->net, &stp->st_stid);
free_ol_stateid_reaplist(&reaplist);
} else {
spin_unlock(&clp->cl_lock);
free_ol_stateid_reaplist(&reaplist);
if (unhashed)
move_to_close_lru(s, clp->net);
}
}
/*
* nfs4_unlock_state() called after encode
*/
__be32
nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_close *close = &u->close;
__be32 status;
struct nfs4_ol_stateid *stp;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
dprintk("NFSD: nfsd4_close on file %pd\n",
cstate->current_fh.fh_dentry);
status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
&close->cl_stateid,
NFS4_OPEN_STID|NFS4_CLOSED_STID,
&stp, nn);
nfsd4_bump_seqid(cstate, status);
if (status)
goto out;
stp->st_stid.sc_type = NFS4_CLOSED_STID;
/*
* Technically we don't _really_ have to increment or copy it, since
* it should just be gone after this operation and we clobber the
* copied value below, but we continue to do so here just to ensure
* that racing ops see that there was a state change.
*/
nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
nfsd4_close_open_stateid(stp);
mutex_unlock(&stp->st_mutex);
/* v4.1+ suggests that we send a special stateid in here, since the
* clients should just ignore this anyway. Since this is not useful
* for v4.0 clients either, we set it to the special close_stateid
* universally.
*
* See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
*/
memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
/* put reference from nfs4_preprocess_seqid_op */
nfs4_put_stid(&stp->st_stid);
out:
return status;
}
__be32
nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_delegreturn *dr = &u->delegreturn;
struct nfs4_delegation *dp;
stateid_t *stateid = &dr->dr_stateid;
struct nfs4_stid *s;
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
return status;
status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
if (status)
goto out;
dp = delegstateid(s);
status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
if (status)
goto put_stateid;
trace_nfsd_deleg_return(stateid);
wake_up_var(d_inode(cstate->current_fh.fh_dentry));
destroy_delegation(dp);
put_stateid:
nfs4_put_stid(&dp->dl_stid);
out:
return status;
}
/* last octet in a range */
static inline u64
last_byte_offset(u64 start, u64 len)
{
u64 end;
WARN_ON_ONCE(!len);
end = start + len;
return end > start ? end - 1: NFS4_MAX_UINT64;
}
/*
* TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
* we can't properly handle lock requests that go beyond the (2^63 - 1)-th
* byte, because of sign extension problems. Since NFSv4 calls for 64-bit
* locking, this prevents us from being completely protocol-compliant. The
* real solution to this problem is to start using unsigned file offsets in
* the VFS, but this is a very deep change!
*/
static inline void
nfs4_transform_lock_offset(struct file_lock *lock)
{
if (lock->fl_start < 0)
lock->fl_start = OFFSET_MAX;
if (lock->fl_end < 0)
lock->fl_end = OFFSET_MAX;
}
static fl_owner_t
nfsd4_lm_get_owner(fl_owner_t owner)
{
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
nfs4_get_stateowner(&lo->lo_owner);
return owner;
}
static void
nfsd4_lm_put_owner(fl_owner_t owner)
{
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
if (lo)
nfs4_put_stateowner(&lo->lo_owner);
}
/* return pointer to struct nfs4_client if client is expirable */
static bool
nfsd4_lm_lock_expirable(struct file_lock *cfl)
{
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)cfl->fl_owner;
struct nfs4_client *clp = lo->lo_owner.so_client;
struct nfsd_net *nn;
if (try_to_expire_client(clp)) {
nn = net_generic(clp->net, nfsd_net_id);
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
return true;
}
return false;
}
/* schedule laundromat to run immediately and wait for it to complete */
static void
nfsd4_lm_expire_lock(void)
{
flush_workqueue(laundry_wq);
}
static void
nfsd4_lm_notify(struct file_lock *fl)
{
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
struct net *net = lo->lo_owner.so_client->net;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct nfsd4_blocked_lock *nbl = container_of(fl,
struct nfsd4_blocked_lock, nbl_lock);
bool queue = false;
/* An empty list means that something else is going to be using it */
spin_lock(&nn->blocked_locks_lock);
if (!list_empty(&nbl->nbl_list)) {
list_del_init(&nbl->nbl_list);
list_del_init(&nbl->nbl_lru);
queue = true;
}
spin_unlock(&nn->blocked_locks_lock);
if (queue) {
trace_nfsd_cb_notify_lock(lo, nbl);
nfsd4_run_cb(&nbl->nbl_cb);
}
}
static const struct lock_manager_operations nfsd_posix_mng_ops = {
.lm_mod_owner = THIS_MODULE,
.lm_notify = nfsd4_lm_notify,
.lm_get_owner = nfsd4_lm_get_owner,
.lm_put_owner = nfsd4_lm_put_owner,
.lm_lock_expirable = nfsd4_lm_lock_expirable,
.lm_expire_lock = nfsd4_lm_expire_lock,
};
static inline void
nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
{
struct nfs4_lockowner *lo;
if (fl->fl_lmops == &nfsd_posix_mng_ops) {
lo = (struct nfs4_lockowner *) fl->fl_owner;
xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner,
GFP_KERNEL);
if (!deny->ld_owner.data)
/* We just don't care that much */
goto nevermind;
deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
} else {
nevermind:
deny->ld_owner.len = 0;
deny->ld_owner.data = NULL;
deny->ld_clientid.cl_boot = 0;
deny->ld_clientid.cl_id = 0;
}
deny->ld_start = fl->fl_start;
deny->ld_length = NFS4_MAX_UINT64;
if (fl->fl_end != NFS4_MAX_UINT64)
deny->ld_length = fl->fl_end - fl->fl_start + 1;
deny->ld_type = NFS4_READ_LT;
if (fl->fl_type != F_RDLCK)
deny->ld_type = NFS4_WRITE_LT;
}
static struct nfs4_lockowner *
find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
{
unsigned int strhashval = ownerstr_hashval(owner);
struct nfs4_stateowner *so;
lockdep_assert_held(&clp->cl_lock);
list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
so_strhash) {
if (so->so_is_open_owner)
continue;
if (same_owner_str(so, owner))
return lockowner(nfs4_get_stateowner(so));
}
return NULL;
}
static struct nfs4_lockowner *
find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
{
struct nfs4_lockowner *lo;
spin_lock(&clp->cl_lock);
lo = find_lockowner_str_locked(clp, owner);
spin_unlock(&clp->cl_lock);
return lo;
}
static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
{
unhash_lockowner_locked(lockowner(sop));
}
static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
{
struct nfs4_lockowner *lo = lockowner(sop);
kmem_cache_free(lockowner_slab, lo);
}
static const struct nfs4_stateowner_operations lockowner_ops = {
.so_unhash = nfs4_unhash_lockowner,
.so_free = nfs4_free_lockowner,
};
/*
* Alloc a lock owner structure.
* Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
* occurred.
*
* strhashval = ownerstr_hashval
*/
static struct nfs4_lockowner *
alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
struct nfs4_ol_stateid *open_stp,
struct nfsd4_lock *lock)
{
struct nfs4_lockowner *lo, *ret;
lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
if (!lo)
return NULL;
INIT_LIST_HEAD(&lo->lo_blocked);
INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
lo->lo_owner.so_is_open_owner = 0;
lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
lo->lo_owner.so_ops = &lockowner_ops;
spin_lock(&clp->cl_lock);
ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
if (ret == NULL) {
list_add(&lo->lo_owner.so_strhash,
&clp->cl_ownerstr_hashtbl[strhashval]);
ret = lo;
} else
nfs4_free_stateowner(&lo->lo_owner);
spin_unlock(&clp->cl_lock);
return ret;
}
static struct nfs4_ol_stateid *
find_lock_stateid(const struct nfs4_lockowner *lo,
const struct nfs4_ol_stateid *ost)
{
struct nfs4_ol_stateid *lst;
lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
/* If ost is not hashed, ost->st_locks will not be valid */
if (!nfs4_ol_stateid_unhashed(ost))
list_for_each_entry(lst, &ost->st_locks, st_locks) {
if (lst->st_stateowner == &lo->lo_owner) {
refcount_inc(&lst->st_stid.sc_count);
return lst;
}
}
return NULL;
}
static struct nfs4_ol_stateid *
init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
struct nfs4_file *fp, struct inode *inode,
struct nfs4_ol_stateid *open_stp)
{
struct nfs4_client *clp = lo->lo_owner.so_client;
struct nfs4_ol_stateid *retstp;
mutex_init(&stp->st_mutex);
mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
retry:
spin_lock(&clp->cl_lock);
if (nfs4_ol_stateid_unhashed(open_stp))
goto out_close;
retstp = find_lock_stateid(lo, open_stp);
if (retstp)
goto out_found;
refcount_inc(&stp->st_stid.sc_count);
stp->st_stid.sc_type = NFS4_LOCK_STID;
stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
get_nfs4_file(fp);
stp->st_stid.sc_file = fp;
stp->st_access_bmap = 0;
stp->st_deny_bmap = open_stp->st_deny_bmap;
stp->st_openstp = open_stp;
spin_lock(&fp->fi_lock);
list_add(&stp->st_locks, &open_stp->st_locks);
list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
list_add(&stp->st_perfile, &fp->fi_stateids);
spin_unlock(&fp->fi_lock);
spin_unlock(&clp->cl_lock);
return stp;
out_found:
spin_unlock(&clp->cl_lock);
if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
nfs4_put_stid(&retstp->st_stid);
goto retry;
}
/* To keep mutex tracking happy */
mutex_unlock(&stp->st_mutex);
return retstp;
out_close:
spin_unlock(&clp->cl_lock);
mutex_unlock(&stp->st_mutex);
return NULL;
}
static struct nfs4_ol_stateid *
find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
struct inode *inode, struct nfs4_ol_stateid *ost,
bool *new)
{
struct nfs4_stid *ns = NULL;
struct nfs4_ol_stateid *lst;
struct nfs4_openowner *oo = openowner(ost->st_stateowner);
struct nfs4_client *clp = oo->oo_owner.so_client;
*new = false;
spin_lock(&clp->cl_lock);
lst = find_lock_stateid(lo, ost);
spin_unlock(&clp->cl_lock);
if (lst != NULL) {
if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
goto out;
nfs4_put_stid(&lst->st_stid);
}
ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
if (ns == NULL)
return NULL;
lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
if (lst == openlockstateid(ns))
*new = true;
else
nfs4_put_stid(ns);
out:
return lst;
}
static int
check_lock_length(u64 offset, u64 length)
{
return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
(length > ~offset)));
}
static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
{
struct nfs4_file *fp = lock_stp->st_stid.sc_file;
lockdep_assert_held(&fp->fi_lock);
if (test_access(access, lock_stp))
return;
__nfs4_file_get_access(fp, access);
set_access(access, lock_stp);
}
static __be32
lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
struct nfs4_ol_stateid *ost,
struct nfsd4_lock *lock,
struct nfs4_ol_stateid **plst, bool *new)
{
__be32 status;
struct nfs4_file *fi = ost->st_stid.sc_file;
struct nfs4_openowner *oo = openowner(ost->st_stateowner);
struct nfs4_client *cl = oo->oo_owner.so_client;
struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
struct nfs4_lockowner *lo;
struct nfs4_ol_stateid *lst;
unsigned int strhashval;
lo = find_lockowner_str(cl, &lock->lk_new_owner);
if (!lo) {
strhashval = ownerstr_hashval(&lock->lk_new_owner);
lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
if (lo == NULL)
return nfserr_jukebox;
} else {
/* with an existing lockowner, seqids must be the same */
status = nfserr_bad_seqid;
if (!cstate->minorversion &&
lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
goto out;
}
lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
if (lst == NULL) {
status = nfserr_jukebox;
goto out;
}
status = nfs_ok;
*plst = lst;
out:
nfs4_put_stateowner(&lo->lo_owner);
return status;
}
/*
* LOCK operation
*/
__be32
nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_lock *lock = &u->lock;
struct nfs4_openowner *open_sop = NULL;
struct nfs4_lockowner *lock_sop = NULL;
struct nfs4_ol_stateid *lock_stp = NULL;
struct nfs4_ol_stateid *open_stp = NULL;
struct nfs4_file *fp;
struct nfsd_file *nf = NULL;
struct nfsd4_blocked_lock *nbl = NULL;
struct file_lock *file_lock = NULL;
struct file_lock *conflock = NULL;
__be32 status = 0;
int lkflg;
int err;
bool new = false;
unsigned char fl_type;
unsigned int fl_flags = FL_POSIX;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
(long long) lock->lk_offset,
(long long) lock->lk_length);
if (check_lock_length(lock->lk_offset, lock->lk_length))
return nfserr_inval;
if ((status = fh_verify(rqstp, &cstate->current_fh,
S_IFREG, NFSD_MAY_LOCK))) {
dprintk("NFSD: nfsd4_lock: permission denied!\n");
return status;
}
if (lock->lk_is_new) {
if (nfsd4_has_session(cstate))
/* See rfc 5661 18.10.3: given clientid is ignored: */
memcpy(&lock->lk_new_clientid,
&cstate->clp->cl_clientid,
sizeof(clientid_t));
/* validate and update open stateid and open seqid */
status = nfs4_preprocess_confirmed_seqid_op(cstate,
lock->lk_new_open_seqid,
&lock->lk_new_open_stateid,
&open_stp, nn);
if (status)
goto out;
mutex_unlock(&open_stp->st_mutex);
open_sop = openowner(open_stp->st_stateowner);
status = nfserr_bad_stateid;
if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
&lock->lk_new_clientid))
goto out;
status = lookup_or_create_lock_state(cstate, open_stp, lock,
&lock_stp, &new);
} else {
status = nfs4_preprocess_seqid_op(cstate,
lock->lk_old_lock_seqid,
&lock->lk_old_lock_stateid,
NFS4_LOCK_STID, &lock_stp, nn);
}
if (status)
goto out;
lock_sop = lockowner(lock_stp->st_stateowner);
lkflg = setlkflg(lock->lk_type);
status = nfs4_check_openmode(lock_stp, lkflg);
if (status)
goto out;
status = nfserr_grace;
if (locks_in_grace(net) && !lock->lk_reclaim)
goto out;
status = nfserr_no_grace;
if (!locks_in_grace(net) && lock->lk_reclaim)
goto out;
if (lock->lk_reclaim)
fl_flags |= FL_RECLAIM;
fp = lock_stp->st_stid.sc_file;
switch (lock->lk_type) {
case NFS4_READW_LT:
if (nfsd4_has_session(cstate))
fl_flags |= FL_SLEEP;
fallthrough;
case NFS4_READ_LT:
spin_lock(&fp->fi_lock);
nf = find_readable_file_locked(fp);
if (nf)
get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
spin_unlock(&fp->fi_lock);
fl_type = F_RDLCK;
break;
case NFS4_WRITEW_LT:
if (nfsd4_has_session(cstate))
fl_flags |= FL_SLEEP;
fallthrough;
case NFS4_WRITE_LT:
spin_lock(&fp->fi_lock);
nf = find_writeable_file_locked(fp);
if (nf)
get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
spin_unlock(&fp->fi_lock);
fl_type = F_WRLCK;
break;
default:
status = nfserr_inval;
goto out;
}
if (!nf) {
status = nfserr_openmode;
goto out;
}
/*
* Most filesystems with their own ->lock operations will block
* the nfsd thread waiting to acquire the lock. That leads to
* deadlocks (we don't want every nfsd thread tied up waiting
* for file locks), so don't attempt blocking lock notifications
* on those filesystems:
*/
if (nf->nf_file->f_op->lock)
fl_flags &= ~FL_SLEEP;
nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
if (!nbl) {
dprintk("NFSD: %s: unable to allocate block!\n", __func__);
status = nfserr_jukebox;
goto out;
}
file_lock = &nbl->nbl_lock;
file_lock->fl_type = fl_type;
file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
file_lock->fl_pid = current->tgid;
file_lock->fl_file = nf->nf_file;
file_lock->fl_flags = fl_flags;
file_lock->fl_lmops = &nfsd_posix_mng_ops;
file_lock->fl_start = lock->lk_offset;
file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
nfs4_transform_lock_offset(file_lock);
conflock = locks_alloc_lock();
if (!conflock) {
dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
status = nfserr_jukebox;
goto out;
}
if (fl_flags & FL_SLEEP) {
nbl->nbl_time = ktime_get_boottime_seconds();
spin_lock(&nn->blocked_locks_lock);
list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
kref_get(&nbl->nbl_kref);
spin_unlock(&nn->blocked_locks_lock);
}
err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
switch (err) {
case 0: /* success! */
nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
status = 0;
if (lock->lk_reclaim)
nn->somebody_reclaimed = true;
break;
case FILE_LOCK_DEFERRED:
kref_put(&nbl->nbl_kref, free_nbl);
nbl = NULL;
fallthrough;
case -EAGAIN: /* conflock holds conflicting lock */
status = nfserr_denied;
dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
nfs4_set_lock_denied(conflock, &lock->lk_denied);
break;
case -EDEADLK:
status = nfserr_deadlock;
break;
default:
dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
status = nfserrno(err);
break;
}
out:
if (nbl) {
/* dequeue it if we queued it before */
if (fl_flags & FL_SLEEP) {
spin_lock(&nn->blocked_locks_lock);
if (!list_empty(&nbl->nbl_list) &&
!list_empty(&nbl->nbl_lru)) {
list_del_init(&nbl->nbl_list);
list_del_init(&nbl->nbl_lru);
kref_put(&nbl->nbl_kref, free_nbl);
}
/* nbl can use one of lists to be linked to reaplist */
spin_unlock(&nn->blocked_locks_lock);
}
free_blocked_lock(nbl);
}
if (nf)
nfsd_file_put(nf);
if (lock_stp) {
/* Bump seqid manually if the 4.0 replay owner is openowner */
if (cstate->replay_owner &&
cstate->replay_owner != &lock_sop->lo_owner &&
seqid_mutating_err(ntohl(status)))
lock_sop->lo_owner.so_seqid++;
/*
* If this is a new, never-before-used stateid, and we are
* returning an error, then just go ahead and release it.
*/
if (status && new)
release_lock_stateid(lock_stp);
mutex_unlock(&lock_stp->st_mutex);
nfs4_put_stid(&lock_stp->st_stid);
}
if (open_stp)
nfs4_put_stid(&open_stp->st_stid);
nfsd4_bump_seqid(cstate, status);
if (conflock)
locks_free_lock(conflock);
return status;
}
/*
* The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
* so we do a temporary open here just to get an open file to pass to
* vfs_test_lock.
*/
static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
{
struct nfsd_file *nf;
struct inode *inode;
__be32 err;
err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
if (err)
return err;
inode = fhp->fh_dentry->d_inode;
inode_lock(inode); /* to block new leases till after test_lock: */
err = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
if (err)
goto out;
lock->fl_file = nf->nf_file;
err = nfserrno(vfs_test_lock(nf->nf_file, lock));
lock->fl_file = NULL;
out:
inode_unlock(inode);
nfsd_file_put(nf);
return err;
}
/*
* LOCKT operation
*/
__be32
nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_lockt *lockt = &u->lockt;
struct file_lock *file_lock = NULL;
struct nfs4_lockowner *lo = NULL;
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
if (locks_in_grace(SVC_NET(rqstp)))
return nfserr_grace;
if (check_lock_length(lockt->lt_offset, lockt->lt_length))
return nfserr_inval;
if (!nfsd4_has_session(cstate)) {
status = set_client(&lockt->lt_clientid, cstate, nn);
if (status)
goto out;
}
if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
goto out;
file_lock = locks_alloc_lock();
if (!file_lock) {
dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
status = nfserr_jukebox;
goto out;
}
switch (lockt->lt_type) {
case NFS4_READ_LT:
case NFS4_READW_LT:
file_lock->fl_type = F_RDLCK;
break;
case NFS4_WRITE_LT:
case NFS4_WRITEW_LT:
file_lock->fl_type = F_WRLCK;
break;
default:
dprintk("NFSD: nfs4_lockt: bad lock type!\n");
status = nfserr_inval;
goto out;
}
lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
if (lo)
file_lock->fl_owner = (fl_owner_t)lo;
file_lock->fl_pid = current->tgid;
file_lock->fl_flags = FL_POSIX;
file_lock->fl_start = lockt->lt_offset;
file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
nfs4_transform_lock_offset(file_lock);
status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
if (status)
goto out;
if (file_lock->fl_type != F_UNLCK) {
status = nfserr_denied;
nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
}
out:
if (lo)
nfs4_put_stateowner(&lo->lo_owner);
if (file_lock)
locks_free_lock(file_lock);
return status;
}
__be32
nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_locku *locku = &u->locku;
struct nfs4_ol_stateid *stp;
struct nfsd_file *nf = NULL;
struct file_lock *file_lock = NULL;
__be32 status;
int err;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
(long long) locku->lu_offset,
(long long) locku->lu_length);
if (check_lock_length(locku->lu_offset, locku->lu_length))
return nfserr_inval;
status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
&locku->lu_stateid, NFS4_LOCK_STID,
&stp, nn);
if (status)
goto out;
nf = find_any_file(stp->st_stid.sc_file);
if (!nf) {
status = nfserr_lock_range;
goto put_stateid;
}
file_lock = locks_alloc_lock();
if (!file_lock) {
dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
status = nfserr_jukebox;
goto put_file;
}
file_lock->fl_type = F_UNLCK;
file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
file_lock->fl_pid = current->tgid;
file_lock->fl_file = nf->nf_file;
file_lock->fl_flags = FL_POSIX;
file_lock->fl_lmops = &nfsd_posix_mng_ops;
file_lock->fl_start = locku->lu_offset;
file_lock->fl_end = last_byte_offset(locku->lu_offset,
locku->lu_length);
nfs4_transform_lock_offset(file_lock);
err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
if (err) {
dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
goto out_nfserr;
}
nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
put_file:
nfsd_file_put(nf);
put_stateid:
mutex_unlock(&stp->st_mutex);
nfs4_put_stid(&stp->st_stid);
out:
nfsd4_bump_seqid(cstate, status);
if (file_lock)
locks_free_lock(file_lock);
return status;
out_nfserr:
status = nfserrno(err);
goto put_file;
}
/*
* returns
* true: locks held by lockowner
* false: no locks held by lockowner
*/
static bool
check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
{
struct file_lock *fl;
int status = false;
struct nfsd_file *nf = find_any_file(fp);
struct inode *inode;
struct file_lock_context *flctx;
if (!nf) {
/* Any valid lock stateid should have some sort of access */
WARN_ON_ONCE(1);
return status;
}
inode = file_inode(nf->nf_file);
flctx = locks_inode_context(inode);
if (flctx && !list_empty_careful(&flctx->flc_posix)) {
spin_lock(&flctx->flc_lock);
list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
if (fl->fl_owner == (fl_owner_t)lowner) {
status = true;
break;
}
}
spin_unlock(&flctx->flc_lock);
}
nfsd_file_put(nf);
return status;
}
/**
* nfsd4_release_lockowner - process NFSv4.0 RELEASE_LOCKOWNER operations
* @rqstp: RPC transaction
* @cstate: NFSv4 COMPOUND state
* @u: RELEASE_LOCKOWNER arguments
*
* The lockowner's so_count is bumped when a lock record is added
* or when copying a conflicting lock. The latter case is brief,
* but can lead to fleeting false positives when looking for
* locks-in-use.
*
* Return values:
* %nfs_ok: lockowner released or not found
* %nfserr_locks_held: lockowner still in use
* %nfserr_stale_clientid: clientid no longer active
* %nfserr_expired: clientid not recognized
*/
__be32
nfsd4_release_lockowner(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
clientid_t *clid = &rlockowner->rl_clientid;
struct nfs4_ol_stateid *stp;
struct nfs4_lockowner *lo;
struct nfs4_client *clp;
LIST_HEAD(reaplist);
__be32 status;
dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
clid->cl_boot, clid->cl_id);
status = set_client(clid, cstate, nn);
if (status)
return status;
clp = cstate->clp;
spin_lock(&clp->cl_lock);
lo = find_lockowner_str_locked(clp, &rlockowner->rl_owner);
if (!lo) {
spin_unlock(&clp->cl_lock);
return nfs_ok;
}
if (atomic_read(&lo->lo_owner.so_count) != 2) {
spin_unlock(&clp->cl_lock);
nfs4_put_stateowner(&lo->lo_owner);
return nfserr_locks_held;
}
unhash_lockowner_locked(lo);
while (!list_empty(&lo->lo_owner.so_stateids)) {
stp = list_first_entry(&lo->lo_owner.so_stateids,
struct nfs4_ol_stateid,
st_perstateowner);
WARN_ON(!unhash_lock_stateid(stp));
put_ol_stateid_locked(stp, &reaplist);
}
spin_unlock(&clp->cl_lock);
free_ol_stateid_reaplist(&reaplist);
remove_blocked_locks(lo);
nfs4_put_stateowner(&lo->lo_owner);
return nfs_ok;
}
static inline struct nfs4_client_reclaim *
alloc_reclaim(void)
{
return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
}
bool
nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
{
struct nfs4_client_reclaim *crp;
crp = nfsd4_find_reclaim_client(name, nn);
return (crp && crp->cr_clp);
}
/*
* failure => all reset bets are off, nfserr_no_grace...
*
* The caller is responsible for freeing name.data if NULL is returned (it
* will be freed in nfs4_remove_reclaim_record in the normal case).
*/
struct nfs4_client_reclaim *
nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
struct nfsd_net *nn)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp;
crp = alloc_reclaim();
if (crp) {
strhashval = clientstr_hashval(name);
INIT_LIST_HEAD(&crp->cr_strhash);
list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
crp->cr_name.data = name.data;
crp->cr_name.len = name.len;
crp->cr_princhash.data = princhash.data;
crp->cr_princhash.len = princhash.len;
crp->cr_clp = NULL;
nn->reclaim_str_hashtbl_size++;
}
return crp;
}
void
nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
{
list_del(&crp->cr_strhash);
kfree(crp->cr_name.data);
kfree(crp->cr_princhash.data);
kfree(crp);
nn->reclaim_str_hashtbl_size--;
}
void
nfs4_release_reclaim(struct nfsd_net *nn)
{
struct nfs4_client_reclaim *crp = NULL;
int i;
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
crp = list_entry(nn->reclaim_str_hashtbl[i].next,
struct nfs4_client_reclaim, cr_strhash);
nfs4_remove_reclaim_record(crp, nn);
}
}
WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
}
/*
* called from OPEN, CLAIM_PREVIOUS with a new clientid. */
struct nfs4_client_reclaim *
nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp = NULL;
strhashval = clientstr_hashval(name);
list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
if (compare_blob(&crp->cr_name, &name) == 0) {
return crp;
}
}
return NULL;
}
__be32
nfs4_check_open_reclaim(struct nfs4_client *clp)
{
if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
return nfserr_no_grace;
if (nfsd4_client_record_check(clp))
return nfserr_reclaim_bad;
return nfs_ok;
}
/*
* Since the lifetime of a delegation isn't limited to that of an open, a
* client may quite reasonably hang on to a delegation as long as it has
* the inode cached. This becomes an obvious problem the first time a
* client's inode cache approaches the size of the server's total memory.
*
* For now we avoid this problem by imposing a hard limit on the number
* of delegations, which varies according to the server's memory size.
*/
static void
set_max_delegations(void)
{
/*
* Allow at most 4 delegations per megabyte of RAM. Quick
* estimates suggest that in the worst case (where every delegation
* is for a different inode), a delegation could take about 1.5K,
* giving a worst case usage of about 6% of memory.
*/
max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
}
static int nfs4_state_create_net(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
int i;
nn->conf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
sizeof(struct list_head),
GFP_KERNEL);
if (!nn->conf_id_hashtbl)
goto err;
nn->unconf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
sizeof(struct list_head),
GFP_KERNEL);
if (!nn->unconf_id_hashtbl)
goto err_unconf_id;
nn->sessionid_hashtbl = kmalloc_array(SESSION_HASH_SIZE,
sizeof(struct list_head),
GFP_KERNEL);
if (!nn->sessionid_hashtbl)
goto err_sessionid;
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
}
for (i = 0; i < SESSION_HASH_SIZE; i++)
INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
nn->conf_name_tree = RB_ROOT;
nn->unconf_name_tree = RB_ROOT;
nn->boot_time = ktime_get_real_seconds();
nn->grace_ended = false;
nn->nfsd4_manager.block_opens = true;
INIT_LIST_HEAD(&nn->nfsd4_manager.list);
INIT_LIST_HEAD(&nn->client_lru);
INIT_LIST_HEAD(&nn->close_lru);
INIT_LIST_HEAD(&nn->del_recall_lru);
spin_lock_init(&nn->client_lock);
spin_lock_init(&nn->s2s_cp_lock);
idr_init(&nn->s2s_cp_stateids);
spin_lock_init(&nn->blocked_locks_lock);
INIT_LIST_HEAD(&nn->blocked_locks_lru);
INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
INIT_WORK(&nn->nfsd_shrinker_work, nfsd4_state_shrinker_worker);
get_net(net);
nn->nfsd_client_shrinker.scan_objects = nfsd4_state_shrinker_scan;
nn->nfsd_client_shrinker.count_objects = nfsd4_state_shrinker_count;
nn->nfsd_client_shrinker.seeks = DEFAULT_SEEKS;
if (register_shrinker(&nn->nfsd_client_shrinker, "nfsd-client"))
goto err_shrinker;
return 0;
err_shrinker:
put_net(net);
kfree(nn->sessionid_hashtbl);
err_sessionid:
kfree(nn->unconf_id_hashtbl);
err_unconf_id:
kfree(nn->conf_id_hashtbl);
err:
return -ENOMEM;
}
static void
nfs4_state_destroy_net(struct net *net)
{
int i;
struct nfs4_client *clp = NULL;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
while (!list_empty(&nn->conf_id_hashtbl[i])) {
clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
destroy_client(clp);
}
}
WARN_ON(!list_empty(&nn->blocked_locks_lru));
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
while (!list_empty(&nn->unconf_id_hashtbl[i])) {
clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
destroy_client(clp);
}
}
kfree(nn->sessionid_hashtbl);
kfree(nn->unconf_id_hashtbl);
kfree(nn->conf_id_hashtbl);
put_net(net);
}
int
nfs4_state_start_net(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
int ret;
ret = nfs4_state_create_net(net);
if (ret)
return ret;
locks_start_grace(net, &nn->nfsd4_manager);
nfsd4_client_tracking_init(net);
if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
goto skip_grace;
printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
nn->nfsd4_grace, net->ns.inum);
trace_nfsd_grace_start(nn);
queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
return 0;
skip_grace:
printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
net->ns.inum);
queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ);
nfsd4_end_grace(nn);
return 0;
}
/* initialization to perform when the nfsd service is started: */
int
nfs4_state_start(void)
{
int ret;
ret = rhltable_init(&nfs4_file_rhltable, &nfs4_file_rhash_params);
if (ret)
return ret;
ret = nfsd4_create_callback_queue();
if (ret) {
rhltable_destroy(&nfs4_file_rhltable);
return ret;
}
set_max_delegations();
return 0;
}
void
nfs4_state_shutdown_net(struct net *net)
{
struct nfs4_delegation *dp = NULL;
struct list_head *pos, *next, reaplist;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
unregister_shrinker(&nn->nfsd_client_shrinker);
cancel_work(&nn->nfsd_shrinker_work);
cancel_delayed_work_sync(&nn->laundromat_work);
locks_end_grace(&nn->nfsd4_manager);
INIT_LIST_HEAD(&reaplist);
spin_lock(&state_lock);
list_for_each_safe(pos, next, &nn->del_recall_lru) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
WARN_ON(!unhash_delegation_locked(dp));
list_add(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&state_lock);
list_for_each_safe(pos, next, &reaplist) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
destroy_unhashed_deleg(dp);
}
nfsd4_client_tracking_exit(net);
nfs4_state_destroy_net(net);
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
nfsd4_ssc_shutdown_umount(nn);
#endif
}
void
nfs4_state_shutdown(void)
{
nfsd4_destroy_callback_queue();
rhltable_destroy(&nfs4_file_rhltable);
}
static void
get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
{
if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) &&
CURRENT_STATEID(stateid))
memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
}
static void
put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
{
if (cstate->minorversion) {
memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
}
}
void
clear_current_stateid(struct nfsd4_compound_state *cstate)
{
CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
}
/*
* functions to set current state id
*/
void
nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
put_stateid(cstate, &u->open_downgrade.od_stateid);
}
void
nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
put_stateid(cstate, &u->open.op_stateid);
}
void
nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
put_stateid(cstate, &u->close.cl_stateid);
}
void
nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
put_stateid(cstate, &u->lock.lk_resp_stateid);
}
/*
* functions to consume current state id
*/
void
nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->open_downgrade.od_stateid);
}
void
nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->delegreturn.dr_stateid);
}
void
nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->free_stateid.fr_stateid);
}
void
nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->setattr.sa_stateid);
}
void
nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->close.cl_stateid);
}
void
nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->locku.lu_stateid);
}
void
nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->read.rd_stateid);
}
void
nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->write.wr_stateid);
}
/**
* nfsd4_deleg_getattr_conflict - Recall if GETATTR causes conflict
* @rqstp: RPC transaction context
* @inode: file to be checked for a conflict
*
* This function is called when there is a conflict between a write
* delegation and a change/size GETATTR from another client. The server
* must either use the CB_GETATTR to get the current values of the
* attributes from the client that holds the delegation or recall the
* delegation before replying to the GETATTR. See RFC 8881 section
* 18.7.4.
*
* The current implementation does not support CB_GETATTR yet. However
* this can avoid recalling the delegation could be added in follow up
* work.
*
* Returns 0 if there is no conflict; otherwise an nfs_stat
* code is returned.
*/
__be32
nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct inode *inode)
{
__be32 status;
struct file_lock_context *ctx;
struct file_lock *fl;
struct nfs4_delegation *dp;
ctx = locks_inode_context(inode);
if (!ctx)
return 0;
spin_lock(&ctx->flc_lock);
list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
if (fl->fl_flags == FL_LAYOUT)
continue;
if (fl->fl_lmops != &nfsd_lease_mng_ops) {
/*
* non-nfs lease, if it's a lease with F_RDLCK then
* we are done; there isn't any write delegation
* on this inode
*/
if (fl->fl_type == F_RDLCK)
break;
goto break_lease;
}
if (fl->fl_type == F_WRLCK) {
dp = fl->fl_owner;
if (dp->dl_recall.cb_clp == *(rqstp->rq_lease_breaker)) {
spin_unlock(&ctx->flc_lock);
return 0;
}
break_lease:
spin_unlock(&ctx->flc_lock);
nfsd_stats_wdeleg_getattr_inc();
status = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
if (status != nfserr_jukebox ||
!nfsd_wait_for_delegreturn(rqstp, inode))
return status;
return 0;
}
break;
}
spin_unlock(&ctx->flc_lock);
return 0;
}
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