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NFS refactor nfs_find_client and reference client across callback processing

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Fixes a bug where the nfs_client could be freed during callback processing.
Refactor nfs_find_client to use minorversion specific means to locate the
correct nfs_client structure.

In the NFS layer, V4.0 clients are found using the callback_ident field in the
CB_COMPOUND header.  V4.1 clients are found using the sessionID in the
CB_SEQUENCE operation which is also compared against the sessionID associated
with the back channel thread after a successful CREATE_SESSION.

Each of these methods finds the one an only nfs_client associated
with the incoming callback request - so nfs_find_client_next is not needed.

In the RPC layer, the pg_authenticate call needs to find the nfs_client. For
the v4.0 callback service, the callback identifier has not been decoded so a
search by address, version, and minorversion is used.  The sessionid for the
sessions based callback service has (usually) not been set for the
pg_authenticate on a CB_NULL call which can be sent prior to the return
of a CREATE_SESSION call, so the sessionid associated with the back channel
thread is not used to find the client in pg_authenticate for CB_NULL calls.

Pass the referenced nfs_client to each CB_COMPOUND operation being proceesed
via the new cb_process_state structure. The reference is held across
cb_compound processing.

Use the new cb_process_state struct to move the NFS4ERR_RETRY_UNCACHED_REP
processing from process_op into nfs4_callback_sequence where it belongs.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson 2011-01-06 02:04:32 +00:00 committed by Trond Myklebust
parent 2c2618c6f2
commit c36fca52f5
7 changed files with 259 additions and 189 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
fs/nfs/callback.c
View File

@ -16,9 +16,7 @@
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/sunrpc/svcauth_gss.h>
#if defined(CONFIG_NFS_V4_1)
#include <linux/sunrpc/bc_xprt.h>
#endif
#include <net/inet_sock.h>
@ -384,6 +382,23 @@ static int check_gss_callback_principal(struct nfs_client *clp,
return SVC_OK;
}
/* pg_authenticate method helper */
static struct nfs_client *nfs_cb_find_client(struct svc_rqst *rqstp)
{
struct nfs4_sessionid *sessionid = bc_xprt_sid(rqstp);
int is_cb_compound = rqstp->rq_proc == CB_COMPOUND ? 1 : 0;
dprintk("--> %s rq_proc %d\n", __func__, rqstp->rq_proc);
if (svc_is_backchannel(rqstp))
/* Sessionid (usually) set after CB_NULL ping */
return nfs4_find_client_sessionid(svc_addr(rqstp), sessionid,
is_cb_compound);
else
/* No callback identifier in pg_authenticate */
return nfs4_find_client_no_ident(svc_addr(rqstp));
}
/* pg_authenticate method for nfsv4 callback threads. */
static int nfs_callback_authenticate(struct svc_rqst *rqstp)
{
struct nfs_client *clp;
@ -391,7 +406,7 @@ static int nfs_callback_authenticate(struct svc_rqst *rqstp)
int ret = SVC_OK;
/* Don't talk to strangers */
clp = nfs_find_client(svc_addr(rqstp), 4);
clp = nfs_cb_find_client(rqstp);
if (clp == NULL)
return SVC_DROP;

28
fs/nfs/callback.h
View File

@ -34,10 +34,17 @@ enum nfs4_callback_opnum {
OP_CB_ILLEGAL = 10044,
};
struct cb_process_state {
__be32 drc_status;
struct nfs_client *clp;
struct nfs4_sessionid *svc_sid; /* v4.1 callback service sessionid */
};
struct cb_compound_hdr_arg {
unsigned int taglen;
const char *tag;
unsigned int minorversion;
unsigned int cb_ident; /* v4.0 callback identifier */
unsigned nops;
};
@ -103,8 +110,9 @@ struct cb_sequenceres {
uint32_t csr_target_highestslotid;
};
extern unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,
struct cb_sequenceres *res);
extern __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
struct cb_sequenceres *res,
struct cb_process_state *cps);
extern int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation,
const nfs4_stateid *stateid);
@ -118,19 +126,25 @@ struct cb_recallanyargs {
uint32_t craa_type_mask;
};
extern unsigned nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy);
extern __be32 nfs4_callback_recallany(struct cb_recallanyargs *args,
void *dummy,
struct cb_process_state *cps);
struct cb_recallslotargs {
struct sockaddr *crsa_addr;
uint32_t crsa_target_max_slots;
};
extern unsigned nfs4_callback_recallslot(struct cb_recallslotargs *args,
void *dummy);
extern __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args,
void *dummy,
struct cb_process_state *cps);
#endif /* CONFIG_NFS_V4_1 */
extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res);
extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy);
extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
struct cb_getattrres *res,
struct cb_process_state *cps);
extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
struct cb_process_state *cps);
#ifdef CONFIG_NFS_V4
extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);

169
fs/nfs/callback_proc.c
View File

@ -16,26 +16,28 @@
#ifdef NFS_DEBUG
#define NFSDBG_FACILITY NFSDBG_CALLBACK
#endif
__be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
struct cb_getattrres *res,
struct cb_process_state *cps)
{
struct nfs_client *clp;
struct nfs_delegation *delegation;
struct nfs_inode *nfsi;
struct inode *inode;
res->bitmap[0] = res->bitmap[1] = 0;
res->status = htonl(NFS4ERR_BADHANDLE);
clp = nfs_find_client(args->addr, 4);
if (clp == NULL)
res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
goto out;
dprintk("NFS: GETATTR callback request from %s\n",
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
res->bitmap[0] = res->bitmap[1] = 0;
res->status = htonl(NFS4ERR_BADHANDLE);
inode = nfs_delegation_find_inode(clp, &args->fh);
dprintk("NFS: GETATTR callback request from %s\n",
rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
inode = nfs_delegation_find_inode(cps->clp, &args->fh);
if (inode == NULL)
goto out_putclient;
goto out;
nfsi = NFS_I(inode);
rcu_read_lock();
delegation = rcu_dereference(nfsi->delegation);
@ -55,49 +57,41 @@ __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *
out_iput:
rcu_read_unlock();
iput(inode);
out_putclient:
nfs_put_client(clp);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
return res->status;
}
__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
struct cb_process_state *cps)
{
struct nfs_client *clp;
struct inode *inode;
__be32 res;
res = htonl(NFS4ERR_BADHANDLE);
clp = nfs_find_client(args->addr, 4);
if (clp == NULL)
res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
goto out;
dprintk("NFS: RECALL callback request from %s\n",
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
do {
struct nfs_client *prev = clp;
inode = nfs_delegation_find_inode(clp, &args->fh);
if (inode != NULL) {
/* Set up a helper thread to actually return the delegation */
switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
case 0:
res = 0;
break;
case -ENOENT:
if (res != 0)
res = htonl(NFS4ERR_BAD_STATEID);
break;
default:
res = htonl(NFS4ERR_RESOURCE);
}
iput(inode);
}
clp = nfs_find_client_next(prev);
nfs_put_client(prev);
} while (clp != NULL);
res = htonl(NFS4ERR_BADHANDLE);
inode = nfs_delegation_find_inode(cps->clp, &args->fh);
if (inode == NULL)
goto out;
/* Set up a helper thread to actually return the delegation */
switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
case 0:
res = 0;
break;
case -ENOENT:
if (res != 0)
res = htonl(NFS4ERR_BAD_STATEID);
break;
default:
res = htonl(NFS4ERR_RESOURCE);
}
iput(inode);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
return res;
@ -184,42 +178,6 @@ validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
return htonl(NFS4ERR_SEQ_MISORDERED);
}
/*
* Returns a pointer to a held 'struct nfs_client' that matches the server's
* address, major version number, and session ID. It is the caller's
* responsibility to release the returned reference.
*
* Returns NULL if there are no connections with sessions, or if no session
* matches the one of interest.
*/
static struct nfs_client *find_client_with_session(
const struct sockaddr *addr, u32 nfsversion,
struct nfs4_sessionid *sessionid)
{
struct nfs_client *clp;
clp = nfs_find_client(addr, 4);
if (clp == NULL)
return NULL;
do {
struct nfs_client *prev = clp;
if (clp->cl_session != NULL) {
if (memcmp(clp->cl_session->sess_id.data,
sessionid->data,
NFS4_MAX_SESSIONID_LEN) == 0) {
/* Returns a held reference to clp */
return clp;
}
}
clp = nfs_find_client_next(prev);
nfs_put_client(prev);
} while (clp != NULL);
return NULL;
}
/*
* For each referring call triple, check the session's slot table for
* a match. If the slot is in use and the sequence numbers match, the
@ -276,20 +234,28 @@ out:
}
__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
struct cb_sequenceres *res)
struct cb_sequenceres *res,
struct cb_process_state *cps)
{
struct nfs_client *clp;
int i;
__be32 status;
cps->clp = NULL;
status = htonl(NFS4ERR_BADSESSION);
clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid);
/* Incoming session must match the callback session */
if (memcmp(&args->csa_sessionid, cps->svc_sid, NFS4_MAX_SESSIONID_LEN))
goto out;
clp = nfs4_find_client_sessionid(args->csa_addr,
&args->csa_sessionid, 1);
if (clp == NULL)
goto out;
status = validate_seqid(&clp->cl_session->bc_slot_table, args);
if (status)
goto out_putclient;
goto out;
/*
* Check for pending referring calls. If a match is found, a
@ -298,7 +264,7 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
*/
if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
status = htonl(NFS4ERR_DELAY);
goto out_putclient;
goto out;
}
memcpy(&res->csr_sessionid, &args->csa_sessionid,
@ -307,36 +273,36 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
res->csr_slotid = args->csa_slotid;
res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
cps->clp = clp; /* put in nfs4_callback_compound */
out_putclient:
nfs_put_client(clp);
out:
for (i = 0; i < args->csa_nrclists; i++)
kfree(args->csa_rclists[i].rcl_refcalls);
kfree(args->csa_rclists);
if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP))
res->csr_status = 0;
else
if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
cps->drc_status = status;
status = 0;
} else
res->csr_status = status;
dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
ntohl(status), ntohl(res->csr_status));
return status;
}
__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy)
__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
struct cb_process_state *cps)
{
struct nfs_client *clp;
__be32 status;
fmode_t flags = 0;
status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
clp = nfs_find_client(args->craa_addr, 4);
if (clp == NULL)
if (!cps->clp) /* set in cb_sequence */
goto out;
dprintk("NFS: RECALL_ANY callback request from %s\n",
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
&args->craa_type_mask))
@ -346,7 +312,7 @@ __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy)
flags |= FMODE_WRITE;
if (flags)
nfs_expire_all_delegation_types(clp, flags);
nfs_expire_all_delegation_types(cps->clp, flags);
status = htonl(NFS4_OK);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
@ -354,36 +320,33 @@ out:
}
/* Reduce the fore channel's max_slots to the target value */
__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy)
__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
struct cb_process_state *cps)
{
struct nfs_client *clp;
struct nfs4_slot_table *fc_tbl;
__be32 status;
status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
clp = nfs_find_client(args->crsa_addr, 4);
if (clp == NULL)
if (!cps->clp) /* set in cb_sequence */
goto out;
dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
args->crsa_target_max_slots);
fc_tbl = &clp->cl_session->fc_slot_table;
fc_tbl = &cps->clp->cl_session->fc_slot_table;
status = htonl(NFS4ERR_BAD_HIGH_SLOT);
if (args->crsa_target_max_slots > fc_tbl->max_slots ||
args->crsa_target_max_slots < 1)
goto out_putclient;
goto out;
status = htonl(NFS4_OK);
if (args->crsa_target_max_slots == fc_tbl->max_slots)
goto out_putclient;
goto out;
fc_tbl->target_max_slots = args->crsa_target_max_slots;
nfs41_handle_recall_slot(clp);
out_putclient:
nfs_put_client(clp); /* balance nfs_find_client */
nfs41_handle_recall_slot(cps->clp);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
return status;

39
fs/nfs/callback_xdr.c
View File

@ -10,8 +10,10 @@
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/slab.h>
#include <linux/sunrpc/bc_xprt.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "internal.h"
#define CB_OP_TAGLEN_MAXSZ (512)
#define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
@ -33,7 +35,8 @@
/* Internal error code */
#define NFS4ERR_RESOURCE_HDR 11050
typedef __be32 (*callback_process_op_t)(void *, void *);
typedef __be32 (*callback_process_op_t)(void *, void *,
struct cb_process_state *);
typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
@ -160,7 +163,7 @@ static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound
hdr->minorversion = ntohl(*p++);
/* Check minor version is zero or one. */
if (hdr->minorversion <= 1) {
p++; /* skip callback_ident */
hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */
} else {
printk(KERN_WARNING "%s: NFSv4 server callback with "
"illegal minor version %u!\n",
@ -621,7 +624,8 @@ preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
static __be32 process_op(uint32_t minorversion, int nop,
struct svc_rqst *rqstp,
struct xdr_stream *xdr_in, void *argp,
struct xdr_stream *xdr_out, void *resp, int* drc_status)
struct xdr_stream *xdr_out, void *resp,
struct cb_process_state *cps)
{
struct callback_op *op = &callback_ops[0];
unsigned int op_nr;
@ -644,8 +648,8 @@ static __be32 process_op(uint32_t minorversion, int nop,
if (status)
goto encode_hdr;
if (*drc_status) {
status = *drc_status;
if (cps->drc_status) {
status = cps->drc_status;
goto encode_hdr;
}
@ -653,16 +657,10 @@ static __be32 process_op(uint32_t minorversion, int nop,
if (maxlen > 0 && maxlen < PAGE_SIZE) {
status = op->decode_args(rqstp, xdr_in, argp);
if (likely(status == 0))
status = op->process_op(argp, resp);
status = op->process_op(argp, resp, cps);
} else
status = htonl(NFS4ERR_RESOURCE);
/* Only set by OP_CB_SEQUENCE processing */
if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
*drc_status = status;
status = 0;
}
encode_hdr:
res = encode_op_hdr(xdr_out, op_nr, status);
if (unlikely(res))
@ -681,8 +679,11 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r
struct cb_compound_hdr_arg hdr_arg = { 0 };
struct cb_compound_hdr_res hdr_res = { NULL };
struct xdr_stream xdr_in, xdr_out;
__be32 *p;
__be32 status, drc_status = 0;
__be32 *p, status;
struct cb_process_state cps = {
.drc_status = 0,
.clp = NULL,
};
unsigned int nops = 0;
dprintk("%s: start\n", __func__);
@ -696,6 +697,13 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r
if (status == __constant_htonl(NFS4ERR_RESOURCE))
return rpc_garbage_args;
if (hdr_arg.minorversion == 0) {
cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident);
if (!cps.clp)
return rpc_drop_reply;
} else
cps.svc_sid = bc_xprt_sid(rqstp);
hdr_res.taglen = hdr_arg.taglen;
hdr_res.tag = hdr_arg.tag;
if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
@ -703,7 +711,7 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r
while (status == 0 && nops != hdr_arg.nops) {
status = process_op(hdr_arg.minorversion, nops, rqstp,
&xdr_in, argp, &xdr_out, resp, &drc_status);
&xdr_in, argp, &xdr_out, resp, &cps);
nops++;
}
@ -716,6 +724,7 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r
*hdr_res.status = status;
*hdr_res.nops = htonl(nops);
nfs_put_client(cps.clp);
dprintk("%s: done, status = %u\n", __func__, ntohl(status));
return rpc_success;
}

171
fs/nfs/client.c
View File

@ -410,70 +410,28 @@ static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
return 0;
}
/*
* Find a client by IP address and protocol version
* - returns NULL if no such client
*/
struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
/* Common match routine for v4.0 and v4.1 callback services */
bool
nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp,
u32 minorversion)
{
struct nfs_client *clp;
struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
spin_lock(&nfs_client_lock);
list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
/* Don't match clients that failed to initialise */
if (!(clp->cl_cons_state == NFS_CS_READY ||
clp->cl_cons_state == NFS_CS_SESSION_INITING))
return false;
/* Don't match clients that failed to initialise properly */
if (!(clp->cl_cons_state == NFS_CS_READY ||
clp->cl_cons_state == NFS_CS_SESSION_INITING))
continue;
/* Match the version and minorversion */
if (clp->rpc_ops->version != 4 ||
clp->cl_minorversion != minorversion)
return false;
/* Different NFS versions cannot share the same nfs_client */
if (clp->rpc_ops->version != nfsversion)
continue;
/* Match only the IP address, not the port number */
if (!nfs_sockaddr_match_ipaddr(addr, clap))
return false;
/* Match only the IP address, not the port number */
if (!nfs_sockaddr_match_ipaddr(addr, clap))
continue;
atomic_inc(&clp->cl_count);
spin_unlock(&nfs_client_lock);
return clp;
}
spin_unlock(&nfs_client_lock);
return NULL;
}
/*
* Find a client by IP address and protocol version
* - returns NULL if no such client
*/
struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
{
struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
u32 nfsvers = clp->rpc_ops->version;
spin_lock(&nfs_client_lock);
list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
/* Don't match clients that failed to initialise properly */
if (clp->cl_cons_state != NFS_CS_READY)
continue;
/* Different NFS versions cannot share the same nfs_client */
if (clp->rpc_ops->version != nfsvers)
continue;
/* Match only the IP address, not the port number */
if (!nfs_sockaddr_match_ipaddr(sap, clap))
continue;
atomic_inc(&clp->cl_count);
spin_unlock(&nfs_client_lock);
return clp;
}
spin_unlock(&nfs_client_lock);
return NULL;
return true;
}
/*
@ -1171,6 +1129,101 @@ error:
}
#ifdef CONFIG_NFS_V4
/*
* NFSv4.0 callback thread helper
*
* Find a client by IP address, protocol version, and minorversion
*
* Called from the pg_authenticate method. The callback identifier
* is not used as it has not been decoded.
*
* Returns NULL if no such client
*/
struct nfs_client *
nfs4_find_client_no_ident(const struct sockaddr *addr)
{
struct nfs_client *clp;
spin_lock(&nfs_client_lock);
list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
if (nfs4_cb_match_client(addr, clp, 0) == false)
continue;
atomic_inc(&clp->cl_count);
spin_unlock(&nfs_client_lock);
return clp;
}
spin_unlock(&nfs_client_lock);
return NULL;
}
/*
* NFSv4.0 callback thread helper
*
* Find a client by callback identifier
*/
struct nfs_client *
nfs4_find_client_ident(int cb_ident)
{
struct nfs_client *clp;
spin_lock(&nfs_client_lock);
clp = idr_find(&cb_ident_idr, cb_ident);
if (clp)
atomic_inc(&clp->cl_count);
spin_unlock(&nfs_client_lock);
return clp;
}
#if defined(CONFIG_NFS_V4_1)
/*
* NFSv4.1 callback thread helper
* For CB_COMPOUND calls, find a client by IP address, protocol version,
* minorversion, and sessionID
*
* CREATE_SESSION triggers a CB_NULL ping from servers. The callback service
* sessionid can only be set after the CREATE_SESSION return, so a CB_NULL
* can arrive before the callback sessionid is set. For CB_NULL calls,
* find a client by IP address protocol version, and minorversion.
*
* Returns NULL if no such client
*/
struct nfs_client *
nfs4_find_client_sessionid(const struct sockaddr *addr,
struct nfs4_sessionid *sid, int is_cb_compound)
{
struct nfs_client *clp;
spin_lock(&nfs_client_lock);
list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
if (nfs4_cb_match_client(addr, clp, 1) == false)
continue;
if (!nfs4_has_session(clp))
continue;
/* Match sessionid unless cb_null call*/
if (is_cb_compound && (memcmp(clp->cl_session->sess_id.data,
sid->data, NFS4_MAX_SESSIONID_LEN) != 0))
continue;
atomic_inc(&clp->cl_count);
spin_unlock(&nfs_client_lock);
return clp;
}
spin_unlock(&nfs_client_lock);
return NULL;
}
#else /* CONFIG_NFS_V4_1 */
struct nfs_client *
nfs4_find_client_sessionid(const struct sockaddr *addr,
struct nfs4_sessionid *sid, int is_cb_compound)
{
return NULL;
}
#endif /* CONFIG_NFS_V4_1 */
/*
* Initialize the NFS4 callback service
*/

7
fs/nfs/internal.h
View File

@ -130,8 +130,11 @@ extern struct rpc_program nfs_program;
extern void nfs_cleanup_cb_ident_idr(void);
extern void nfs_put_client(struct nfs_client *);
extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *);
extern struct nfs_client *nfs4_find_client_ident(int);
extern struct nfs_client *
nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *,
int);
extern struct nfs_server *nfs_create_server(
const struct nfs_parsed_mount_data *,
struct nfs_fh *);

13
include/linux/sunrpc/bc_xprt.h
View File

@ -47,6 +47,14 @@ static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
return 1;
return 0;
}
static inline struct nfs4_sessionid *bc_xprt_sid(struct svc_rqst *rqstp)
{
if (svc_is_backchannel(rqstp))
return (struct nfs4_sessionid *)
rqstp->rq_server->bc_xprt->xpt_bc_sid;
return NULL;
}
#else /* CONFIG_NFS_V4_1 */
static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
unsigned int min_reqs)
@ -59,6 +67,11 @@ static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
return 0;
}
static inline struct nfs4_sessionid *bc_xprt_sid(struct svc_rqst *rqstp)
{
return NULL;
}
static inline void xprt_free_bc_request(struct rpc_rqst *req)
{
}