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linux/fs/ceph/mds_client.c
Jeff Layton d4f6b31d72 ceph: don't allow access to MDS-private inodes 
The MDS reserves a set of inodes for its own usage, and these should
never be accessible to clients. Add a new helper to vet a proposed
inode number against that range, and complain loudly and refuse to
create or look it up if it's in it.

Also, ensure that the MDS doesn't try to delegate inodes that are in
that range or lower. Print a warning if it does, and don't save the
range in the xarray.

URL: https://tracker.ceph.com/issues/49922
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2021-04-27 23:52:23 +02:00

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// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/ceph_debug.h>
#include <linux/fs.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/ratelimit.h>
#include <linux/bits.h>
#include <linux/ktime.h>
#include "super.h"
#include "mds_client.h"
#include <linux/ceph/ceph_features.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/pagelist.h>
#include <linux/ceph/auth.h>
#include <linux/ceph/debugfs.h>
#define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
/*
* A cluster of MDS (metadata server) daemons is responsible for
* managing the file system namespace (the directory hierarchy and
* inodes) and for coordinating shared access to storage. Metadata is
* partitioning hierarchically across a number of servers, and that
* partition varies over time as the cluster adjusts the distribution
* in order to balance load.
*
* The MDS client is primarily responsible to managing synchronous
* metadata requests for operations like open, unlink, and so forth.
* If there is a MDS failure, we find out about it when we (possibly
* request and) receive a new MDS map, and can resubmit affected
* requests.
*
* For the most part, though, we take advantage of a lossless
* communications channel to the MDS, and do not need to worry about
* timing out or resubmitting requests.
*
* We maintain a stateful "session" with each MDS we interact with.
* Within each session, we sent periodic heartbeat messages to ensure
* any capabilities or leases we have been issues remain valid. If
* the session times out and goes stale, our leases and capabilities
* are no longer valid.
*/
struct ceph_reconnect_state {
struct ceph_mds_session *session;
int nr_caps, nr_realms;
struct ceph_pagelist *pagelist;
unsigned msg_version;
bool allow_multi;
};
static void __wake_requests(struct ceph_mds_client *mdsc,
struct list_head *head);
static void ceph_cap_release_work(struct work_struct *work);
static void ceph_cap_reclaim_work(struct work_struct *work);
static const struct ceph_connection_operations mds_con_ops;
/*
* mds reply parsing
*/
static int parse_reply_info_quota(void **p, void *end,
struct ceph_mds_reply_info_in *info)
{
u8 struct_v, struct_compat;
u32 struct_len;
ceph_decode_8_safe(p, end, struct_v, bad);
ceph_decode_8_safe(p, end, struct_compat, bad);
/* struct_v is expected to be >= 1. we only
* understand encoding with struct_compat == 1. */
if (!struct_v || struct_compat != 1)
goto bad;
ceph_decode_32_safe(p, end, struct_len, bad);
ceph_decode_need(p, end, struct_len, bad);
end = *p + struct_len;
ceph_decode_64_safe(p, end, info->max_bytes, bad);
ceph_decode_64_safe(p, end, info->max_files, bad);
*p = end;
return 0;
bad:
return -EIO;
}
/*
* parse individual inode info
*/
static int parse_reply_info_in(void **p, void *end,
struct ceph_mds_reply_info_in *info,
u64 features)
{
int err = 0;
u8 struct_v = 0;
if (features == (u64)-1) {
u32 struct_len;
u8 struct_compat;
ceph_decode_8_safe(p, end, struct_v, bad);
ceph_decode_8_safe(p, end, struct_compat, bad);
/* struct_v is expected to be >= 1. we only understand
* encoding with struct_compat == 1. */
if (!struct_v || struct_compat != 1)
goto bad;
ceph_decode_32_safe(p, end, struct_len, bad);
ceph_decode_need(p, end, struct_len, bad);
end = *p + struct_len;
}
ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
info->in = *p;
*p += sizeof(struct ceph_mds_reply_inode) +
sizeof(*info->in->fragtree.splits) *
le32_to_cpu(info->in->fragtree.nsplits);
ceph_decode_32_safe(p, end, info->symlink_len, bad);
ceph_decode_need(p, end, info->symlink_len, bad);
info->symlink = *p;
*p += info->symlink_len;
ceph_decode_copy_safe(p, end, &info->dir_layout,
sizeof(info->dir_layout), bad);
ceph_decode_32_safe(p, end, info->xattr_len, bad);
ceph_decode_need(p, end, info->xattr_len, bad);
info->xattr_data = *p;
*p += info->xattr_len;
if (features == (u64)-1) {
/* inline data */
ceph_decode_64_safe(p, end, info->inline_version, bad);
ceph_decode_32_safe(p, end, info->inline_len, bad);
ceph_decode_need(p, end, info->inline_len, bad);
info->inline_data = *p;
*p += info->inline_len;
/* quota */
err = parse_reply_info_quota(p, end, info);
if (err < 0)
goto out_bad;
/* pool namespace */
ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
if (info->pool_ns_len > 0) {
ceph_decode_need(p, end, info->pool_ns_len, bad);
info->pool_ns_data = *p;
*p += info->pool_ns_len;
}
/* btime */
ceph_decode_need(p, end, sizeof(info->btime), bad);
ceph_decode_copy(p, &info->btime, sizeof(info->btime));
/* change attribute */
ceph_decode_64_safe(p, end, info->change_attr, bad);
/* dir pin */
if (struct_v >= 2) {
ceph_decode_32_safe(p, end, info->dir_pin, bad);
} else {
info->dir_pin = -ENODATA;
}
/* snapshot birth time, remains zero for v<=2 */
if (struct_v >= 3) {
ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
ceph_decode_copy(p, &info->snap_btime,
sizeof(info->snap_btime));
} else {
memset(&info->snap_btime, 0, sizeof(info->snap_btime));
}
/* snapshot count, remains zero for v<=3 */
if (struct_v >= 4) {
ceph_decode_64_safe(p, end, info->rsnaps, bad);
} else {
info->rsnaps = 0;
}
*p = end;
} else {
if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
ceph_decode_64_safe(p, end, info->inline_version, bad);
ceph_decode_32_safe(p, end, info->inline_len, bad);
ceph_decode_need(p, end, info->inline_len, bad);
info->inline_data = *p;
*p += info->inline_len;
} else
info->inline_version = CEPH_INLINE_NONE;
if (features & CEPH_FEATURE_MDS_QUOTA) {
err = parse_reply_info_quota(p, end, info);
if (err < 0)
goto out_bad;
} else {
info->max_bytes = 0;
info->max_files = 0;
}
info->pool_ns_len = 0;
info->pool_ns_data = NULL;
if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
if (info->pool_ns_len > 0) {
ceph_decode_need(p, end, info->pool_ns_len, bad);
info->pool_ns_data = *p;
*p += info->pool_ns_len;
}
}
if (features & CEPH_FEATURE_FS_BTIME) {
ceph_decode_need(p, end, sizeof(info->btime), bad);
ceph_decode_copy(p, &info->btime, sizeof(info->btime));
ceph_decode_64_safe(p, end, info->change_attr, bad);
}
info->dir_pin = -ENODATA;
/* info->snap_btime and info->rsnaps remain zero */
}
return 0;
bad:
err = -EIO;
out_bad:
return err;
}
static int parse_reply_info_dir(void **p, void *end,
struct ceph_mds_reply_dirfrag **dirfrag,
u64 features)
{
if (features == (u64)-1) {
u8 struct_v, struct_compat;
u32 struct_len;
ceph_decode_8_safe(p, end, struct_v, bad);
ceph_decode_8_safe(p, end, struct_compat, bad);
/* struct_v is expected to be >= 1. we only understand
* encoding whose struct_compat == 1. */
if (!struct_v || struct_compat != 1)
goto bad;
ceph_decode_32_safe(p, end, struct_len, bad);
ceph_decode_need(p, end, struct_len, bad);
end = *p + struct_len;
}
ceph_decode_need(p, end, sizeof(**dirfrag), bad);
*dirfrag = *p;
*p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
if (unlikely(*p > end))
goto bad;
if (features == (u64)-1)
*p = end;
return 0;
bad:
return -EIO;
}
static int parse_reply_info_lease(void **p, void *end,
struct ceph_mds_reply_lease **lease,
u64 features)
{
if (features == (u64)-1) {
u8 struct_v, struct_compat;
u32 struct_len;
ceph_decode_8_safe(p, end, struct_v, bad);
ceph_decode_8_safe(p, end, struct_compat, bad);
/* struct_v is expected to be >= 1. we only understand
* encoding whose struct_compat == 1. */
if (!struct_v || struct_compat != 1)
goto bad;
ceph_decode_32_safe(p, end, struct_len, bad);
ceph_decode_need(p, end, struct_len, bad);
end = *p + struct_len;
}
ceph_decode_need(p, end, sizeof(**lease), bad);
*lease = *p;
*p += sizeof(**lease);
if (features == (u64)-1)
*p = end;
return 0;
bad:
return -EIO;
}
/*
* parse a normal reply, which may contain a (dir+)dentry and/or a
* target inode.
*/
static int parse_reply_info_trace(void **p, void *end,
struct ceph_mds_reply_info_parsed *info,
u64 features)
{
int err;
if (info->head->is_dentry) {
err = parse_reply_info_in(p, end, &info->diri, features);
if (err < 0)
goto out_bad;
err = parse_reply_info_dir(p, end, &info->dirfrag, features);
if (err < 0)
goto out_bad;
ceph_decode_32_safe(p, end, info->dname_len, bad);
ceph_decode_need(p, end, info->dname_len, bad);
info->dname = *p;
*p += info->dname_len;
err = parse_reply_info_lease(p, end, &info->dlease, features);
if (err < 0)
goto out_bad;
}
if (info->head->is_target) {
err = parse_reply_info_in(p, end, &info->targeti, features);
if (err < 0)
goto out_bad;
}
if (unlikely(*p != end))
goto bad;
return 0;
bad:
err = -EIO;
out_bad:
pr_err("problem parsing mds trace %d\n", err);
return err;
}
/*
* parse readdir results
*/
static int parse_reply_info_readdir(void **p, void *end,
struct ceph_mds_reply_info_parsed *info,
u64 features)
{
u32 num, i = 0;
int err;
err = parse_reply_info_dir(p, end, &info->dir_dir, features);
if (err < 0)
goto out_bad;
ceph_decode_need(p, end, sizeof(num) + 2, bad);
num = ceph_decode_32(p);
{
u16 flags = ceph_decode_16(p);
info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
}
if (num == 0)
goto done;
BUG_ON(!info->dir_entries);
if ((unsigned long)(info->dir_entries + num) >
(unsigned long)info->dir_entries + info->dir_buf_size) {
pr_err("dir contents are larger than expected\n");
WARN_ON(1);
goto bad;
}
info->dir_nr = num;
while (num) {
struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
/* dentry */
ceph_decode_32_safe(p, end, rde->name_len, bad);
ceph_decode_need(p, end, rde->name_len, bad);
rde->name = *p;
*p += rde->name_len;
dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
/* dentry lease */
err = parse_reply_info_lease(p, end, &rde->lease, features);
if (err)
goto out_bad;
/* inode */
err = parse_reply_info_in(p, end, &rde->inode, features);
if (err < 0)
goto out_bad;
/* ceph_readdir_prepopulate() will update it */
rde->offset = 0;
i++;
num--;
}
done:
/* Skip over any unrecognized fields */
*p = end;
return 0;
bad:
err = -EIO;
out_bad:
pr_err("problem parsing dir contents %d\n", err);
return err;
}
/*
* parse fcntl F_GETLK results
*/
static int parse_reply_info_filelock(void **p, void *end,
struct ceph_mds_reply_info_parsed *info,
u64 features)
{
if (*p + sizeof(*info->filelock_reply) > end)
goto bad;
info->filelock_reply = *p;
/* Skip over any unrecognized fields */
*p = end;
return 0;
bad:
return -EIO;
}
#if BITS_PER_LONG == 64
#define DELEGATED_INO_AVAILABLE xa_mk_value(1)
static int ceph_parse_deleg_inos(void **p, void *end,
struct ceph_mds_session *s)
{
u32 sets;
ceph_decode_32_safe(p, end, sets, bad);
dout("got %u sets of delegated inodes\n", sets);
while (sets--) {
u64 start, len, ino;
ceph_decode_64_safe(p, end, start, bad);
ceph_decode_64_safe(p, end, len, bad);
/* Don't accept a delegation of system inodes */
if (start < CEPH_INO_SYSTEM_BASE) {
pr_warn_ratelimited("ceph: ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n",
start, len);
continue;
}
while (len--) {
int err = xa_insert(&s->s_delegated_inos, ino = start++,
DELEGATED_INO_AVAILABLE,
GFP_KERNEL);
if (!err) {
dout("added delegated inode 0x%llx\n",
start - 1);
} else if (err == -EBUSY) {
pr_warn("ceph: MDS delegated inode 0x%llx more than once.\n",
start - 1);
} else {
return err;
}
}
}
return 0;
bad:
return -EIO;
}
u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
{
unsigned long ino;
void *val;
xa_for_each(&s->s_delegated_inos, ino, val) {
val = xa_erase(&s->s_delegated_inos, ino);
if (val == DELEGATED_INO_AVAILABLE)
return ino;
}
return 0;
}
int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
{
return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE,
GFP_KERNEL);
}
#else /* BITS_PER_LONG == 64 */
/*
* FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just
* ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top
* and bottom words?
*/
static int ceph_parse_deleg_inos(void **p, void *end,
struct ceph_mds_session *s)
{
u32 sets;
ceph_decode_32_safe(p, end, sets, bad);
if (sets)
ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad);
return 0;
bad:
return -EIO;
}
u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
{
return 0;
}
int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
{
return 0;
}
#endif /* BITS_PER_LONG == 64 */
/*
* parse create results
*/
static int parse_reply_info_create(void **p, void *end,
struct ceph_mds_reply_info_parsed *info,
u64 features, struct ceph_mds_session *s)
{
int ret;
if (features == (u64)-1 ||
(features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
if (*p == end) {
/* Malformed reply? */
info->has_create_ino = false;
} else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
info->has_create_ino = true;
/* struct_v, struct_compat, and len */
ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad);
ceph_decode_64_safe(p, end, info->ino, bad);
ret = ceph_parse_deleg_inos(p, end, s);
if (ret)
return ret;
} else {
/* legacy */
ceph_decode_64_safe(p, end, info->ino, bad);
info->has_create_ino = true;
}
} else {
if (*p != end)
goto bad;
}
/* Skip over any unrecognized fields */
*p = end;
return 0;
bad:
return -EIO;
}
/*
* parse extra results
*/
static int parse_reply_info_extra(void **p, void *end,
struct ceph_mds_reply_info_parsed *info,
u64 features, struct ceph_mds_session *s)
{
u32 op = le32_to_cpu(info->head->op);
if (op == CEPH_MDS_OP_GETFILELOCK)
return parse_reply_info_filelock(p, end, info, features);
else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
return parse_reply_info_readdir(p, end, info, features);
else if (op == CEPH_MDS_OP_CREATE)
return parse_reply_info_create(p, end, info, features, s);
else
return -EIO;
}
/*
* parse entire mds reply
*/
static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
struct ceph_mds_reply_info_parsed *info,
u64 features)
{
void *p, *end;
u32 len;
int err;
info->head = msg->front.iov_base;
p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
/* trace */
ceph_decode_32_safe(&p, end, len, bad);
if (len > 0) {
ceph_decode_need(&p, end, len, bad);
err = parse_reply_info_trace(&p, p+len, info, features);
if (err < 0)
goto out_bad;
}
/* extra */
ceph_decode_32_safe(&p, end, len, bad);
if (len > 0) {
ceph_decode_need(&p, end, len, bad);
err = parse_reply_info_extra(&p, p+len, info, features, s);
if (err < 0)
goto out_bad;
}
/* snap blob */
ceph_decode_32_safe(&p, end, len, bad);
info->snapblob_len = len;
info->snapblob = p;
p += len;
if (p != end)
goto bad;
return 0;
bad:
err = -EIO;
out_bad:
pr_err("mds parse_reply err %d\n", err);
return err;
}
static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
{
if (!info->dir_entries)
return;
free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
}
/*
* sessions
*/
const char *ceph_session_state_name(int s)
{
switch (s) {
case CEPH_MDS_SESSION_NEW: return "new";
case CEPH_MDS_SESSION_OPENING: return "opening";
case CEPH_MDS_SESSION_OPEN: return "open";
case CEPH_MDS_SESSION_HUNG: return "hung";
case CEPH_MDS_SESSION_CLOSING: return "closing";
case CEPH_MDS_SESSION_CLOSED: return "closed";
case CEPH_MDS_SESSION_RESTARTING: return "restarting";
case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
case CEPH_MDS_SESSION_REJECTED: return "rejected";
default: return "???";
}
}
struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
{
if (refcount_inc_not_zero(&s->s_ref)) {
dout("mdsc get_session %p %d -> %d\n", s,
refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
return s;
} else {
dout("mdsc get_session %p 0 -- FAIL\n", s);
return NULL;
}
}
void ceph_put_mds_session(struct ceph_mds_session *s)
{
dout("mdsc put_session %p %d -> %d\n", s,
refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
if (refcount_dec_and_test(&s->s_ref)) {
if (s->s_auth.authorizer)
ceph_auth_destroy_authorizer(s->s_auth.authorizer);
WARN_ON(mutex_is_locked(&s->s_mutex));
xa_destroy(&s->s_delegated_inos);
kfree(s);
}
}
/*
* called under mdsc->mutex
*/
struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
int mds)
{
if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
return NULL;
return ceph_get_mds_session(mdsc->sessions[mds]);
}
static bool __have_session(struct ceph_mds_client *mdsc, int mds)
{
if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
return false;
else
return true;
}
static int __verify_registered_session(struct ceph_mds_client *mdsc,
struct ceph_mds_session *s)
{
if (s->s_mds >= mdsc->max_sessions ||
mdsc->sessions[s->s_mds] != s)
return -ENOENT;
return 0;
}
/*
* create+register a new session for given mds.
* called under mdsc->mutex.
*/
static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
int mds)
{
struct ceph_mds_session *s;
if (mds >= mdsc->mdsmap->possible_max_rank)
return ERR_PTR(-EINVAL);
s = kzalloc(sizeof(*s), GFP_NOFS);
if (!s)
return ERR_PTR(-ENOMEM);
if (mds >= mdsc->max_sessions) {
int newmax = 1 << get_count_order(mds + 1);
struct ceph_mds_session **sa;
dout("%s: realloc to %d\n", __func__, newmax);
sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
if (!sa)
goto fail_realloc;
if (mdsc->sessions) {
memcpy(sa, mdsc->sessions,
mdsc->max_sessions * sizeof(void *));
kfree(mdsc->sessions);
}
mdsc->sessions = sa;
mdsc->max_sessions = newmax;
}
dout("%s: mds%d\n", __func__, mds);
s->s_mdsc = mdsc;
s->s_mds = mds;
s->s_state = CEPH_MDS_SESSION_NEW;
s->s_ttl = 0;
s->s_seq = 0;
mutex_init(&s->s_mutex);
ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
spin_lock_init(&s->s_gen_ttl_lock);
s->s_cap_gen = 1;
s->s_cap_ttl = jiffies - 1;
spin_lock_init(&s->s_cap_lock);
s->s_renew_requested = 0;
s->s_renew_seq = 0;
INIT_LIST_HEAD(&s->s_caps);
s->s_nr_caps = 0;
refcount_set(&s->s_ref, 1);
INIT_LIST_HEAD(&s->s_waiting);
INIT_LIST_HEAD(&s->s_unsafe);
xa_init(&s->s_delegated_inos);
s->s_num_cap_releases = 0;
s->s_cap_reconnect = 0;
s->s_cap_iterator = NULL;
INIT_LIST_HEAD(&s->s_cap_releases);
INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
INIT_LIST_HEAD(&s->s_cap_dirty);
INIT_LIST_HEAD(&s->s_cap_flushing);
mdsc->sessions[mds] = s;
atomic_inc(&mdsc->num_sessions);
refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
return s;
fail_realloc:
kfree(s);
return ERR_PTR(-ENOMEM);
}
/*
* called under mdsc->mutex
*/
static void __unregister_session(struct ceph_mds_client *mdsc,
struct ceph_mds_session *s)
{
dout("__unregister_session mds%d %p\n", s->s_mds, s);
BUG_ON(mdsc->sessions[s->s_mds] != s);
mdsc->sessions[s->s_mds] = NULL;
ceph_con_close(&s->s_con);
ceph_put_mds_session(s);
atomic_dec(&mdsc->num_sessions);
}
/*
* drop session refs in request.
*
* should be last request ref, or hold mdsc->mutex
*/
static void put_request_session(struct ceph_mds_request *req)
{
if (req->r_session) {
ceph_put_mds_session(req->r_session);
req->r_session = NULL;
}
}
void ceph_mdsc_release_request(struct kref *kref)
{
struct ceph_mds_request *req = container_of(kref,
struct ceph_mds_request,
r_kref);
ceph_mdsc_release_dir_caps_no_check(req);
destroy_reply_info(&req->r_reply_info);
if (req->r_request)
ceph_msg_put(req->r_request);
if (req->r_reply)
ceph_msg_put(req->r_reply);
if (req->r_inode) {
ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
/* avoid calling iput_final() in mds dispatch threads */
ceph_async_iput(req->r_inode);
}
if (req->r_parent) {
ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
ceph_async_iput(req->r_parent);
}
ceph_async_iput(req->r_target_inode);
if (req->r_dentry)
dput(req->r_dentry);
if (req->r_old_dentry)
dput(req->r_old_dentry);
if (req->r_old_dentry_dir) {
/*
* track (and drop pins for) r_old_dentry_dir
* separately, since r_old_dentry's d_parent may have
* changed between the dir mutex being dropped and
* this request being freed.
*/
ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
CEPH_CAP_PIN);
ceph_async_iput(req->r_old_dentry_dir);
}
kfree(req->r_path1);
kfree(req->r_path2);
put_cred(req->r_cred);
if (req->r_pagelist)
ceph_pagelist_release(req->r_pagelist);
put_request_session(req);
ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
WARN_ON_ONCE(!list_empty(&req->r_wait));
kmem_cache_free(ceph_mds_request_cachep, req);
}
DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
/*
* lookup session, bump ref if found.
*
* called under mdsc->mutex.
*/
static struct ceph_mds_request *
lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
{
struct ceph_mds_request *req;
req = lookup_request(&mdsc->request_tree, tid);
if (req)
ceph_mdsc_get_request(req);
return req;
}
/*
* Register an in-flight request, and assign a tid. Link to directory
* are modifying (if any).
*
* Called under mdsc->mutex.
*/
static void __register_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req,
struct inode *dir)
{
int ret = 0;
req->r_tid = ++mdsc->last_tid;
if (req->r_num_caps) {
ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
req->r_num_caps);
if (ret < 0) {
pr_err("__register_request %p "
"failed to reserve caps: %d\n", req, ret);
/* set req->r_err to fail early from __do_request */
req->r_err = ret;
return;
}
}
dout("__register_request %p tid %lld\n", req, req->r_tid);
ceph_mdsc_get_request(req);
insert_request(&mdsc->request_tree, req);
req->r_cred = get_current_cred();
if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
mdsc->oldest_tid = req->r_tid;
if (dir) {
struct ceph_inode_info *ci = ceph_inode(dir);
ihold(dir);
req->r_unsafe_dir = dir;
spin_lock(&ci->i_unsafe_lock);
list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
spin_unlock(&ci->i_unsafe_lock);
}
}
static void __unregister_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
dout("__unregister_request %p tid %lld\n", req, req->r_tid);
/* Never leave an unregistered request on an unsafe list! */
list_del_init(&req->r_unsafe_item);
if (req->r_tid == mdsc->oldest_tid) {
struct rb_node *p = rb_next(&req->r_node);
mdsc->oldest_tid = 0;
while (p) {
struct ceph_mds_request *next_req =
rb_entry(p, struct ceph_mds_request, r_node);
if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
mdsc->oldest_tid = next_req->r_tid;
break;
}
p = rb_next(p);
}
}
erase_request(&mdsc->request_tree, req);
if (req->r_unsafe_dir) {
struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
spin_lock(&ci->i_unsafe_lock);
list_del_init(&req->r_unsafe_dir_item);
spin_unlock(&ci->i_unsafe_lock);
}
if (req->r_target_inode &&
test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
spin_lock(&ci->i_unsafe_lock);
list_del_init(&req->r_unsafe_target_item);
spin_unlock(&ci->i_unsafe_lock);
}
if (req->r_unsafe_dir) {
/* avoid calling iput_final() in mds dispatch threads */
ceph_async_iput(req->r_unsafe_dir);
req->r_unsafe_dir = NULL;
}
complete_all(&req->r_safe_completion);
ceph_mdsc_put_request(req);
}
/*
* Walk back up the dentry tree until we hit a dentry representing a
* non-snapshot inode. We do this using the rcu_read_lock (which must be held
* when calling this) to ensure that the objects won't disappear while we're
* working with them. Once we hit a candidate dentry, we attempt to take a
* reference to it, and return that as the result.
*/
static struct inode *get_nonsnap_parent(struct dentry *dentry)
{
struct inode *inode = NULL;
while (dentry && !IS_ROOT(dentry)) {
inode = d_inode_rcu(dentry);
if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
break;
dentry = dentry->d_parent;
}
if (inode)
inode = igrab(inode);
return inode;
}
/*
* Choose mds to send request to next. If there is a hint set in the
* request (e.g., due to a prior forward hint from the mds), use that.
* Otherwise, consult frag tree and/or caps to identify the
* appropriate mds. If all else fails, choose randomly.
*
* Called under mdsc->mutex.
*/
static int __choose_mds(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req,
bool *random)
{
struct inode *inode;
struct ceph_inode_info *ci;
struct ceph_cap *cap;
int mode = req->r_direct_mode;
int mds = -1;
u32 hash = req->r_direct_hash;
bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
if (random)
*random = false;
/*
* is there a specific mds we should try? ignore hint if we have
* no session and the mds is not up (active or recovering).
*/
if (req->r_resend_mds >= 0 &&
(__have_session(mdsc, req->r_resend_mds) ||
ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
dout("%s using resend_mds mds%d\n", __func__,
req->r_resend_mds);
return req->r_resend_mds;
}
if (mode == USE_RANDOM_MDS)
goto random;
inode = NULL;
if (req->r_inode) {
if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
inode = req->r_inode;
ihold(inode);
} else {
/* req->r_dentry is non-null for LSSNAP request */
rcu_read_lock();
inode = get_nonsnap_parent(req->r_dentry);
rcu_read_unlock();
dout("%s using snapdir's parent %p\n", __func__, inode);
}
} else if (req->r_dentry) {
/* ignore race with rename; old or new d_parent is okay */
struct dentry *parent;
struct inode *dir;
rcu_read_lock();
parent = READ_ONCE(req->r_dentry->d_parent);
dir = req->r_parent ? : d_inode_rcu(parent);
if (!dir || dir->i_sb != mdsc->fsc->sb) {
/* not this fs or parent went negative */
inode = d_inode(req->r_dentry);
if (inode)
ihold(inode);
} else if (ceph_snap(dir) != CEPH_NOSNAP) {
/* direct snapped/virtual snapdir requests
* based on parent dir inode */
inode = get_nonsnap_parent(parent);
dout("%s using nonsnap parent %p\n", __func__, inode);
} else {
/* dentry target */
inode = d_inode(req->r_dentry);
if (!inode || mode == USE_AUTH_MDS) {
/* dir + name */
inode = igrab(dir);
hash = ceph_dentry_hash(dir, req->r_dentry);
is_hash = true;
} else {
ihold(inode);
}
}
rcu_read_unlock();
}
dout("%s %p is_hash=%d (0x%x) mode %d\n", __func__, inode, (int)is_hash,
hash, mode);
if (!inode)
goto random;
ci = ceph_inode(inode);
if (is_hash && S_ISDIR(inode->i_mode)) {
struct ceph_inode_frag frag;
int found;
ceph_choose_frag(ci, hash, &frag, &found);
if (found) {
if (mode == USE_ANY_MDS && frag.ndist > 0) {
u8 r;
/* choose a random replica */
get_random_bytes(&r, 1);
r %= frag.ndist;
mds = frag.dist[r];
dout("%s %p %llx.%llx frag %u mds%d (%d/%d)\n",
__func__, inode, ceph_vinop(inode),
frag.frag, mds, (int)r, frag.ndist);
if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
CEPH_MDS_STATE_ACTIVE &&
!ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
goto out;
}
/* since this file/dir wasn't known to be
* replicated, then we want to look for the
* authoritative mds. */
if (frag.mds >= 0) {
/* choose auth mds */
mds = frag.mds;
dout("%s %p %llx.%llx frag %u mds%d (auth)\n",
__func__, inode, ceph_vinop(inode),
frag.frag, mds);
if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
CEPH_MDS_STATE_ACTIVE) {
if (!ceph_mdsmap_is_laggy(mdsc->mdsmap,
mds))
goto out;
}
}
mode = USE_AUTH_MDS;
}
}
spin_lock(&ci->i_ceph_lock);
cap = NULL;
if (mode == USE_AUTH_MDS)
cap = ci->i_auth_cap;
if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
if (!cap) {
spin_unlock(&ci->i_ceph_lock);
ceph_async_iput(inode);
goto random;
}
mds = cap->session->s_mds;
dout("%s %p %llx.%llx mds%d (%scap %p)\n", __func__,
inode, ceph_vinop(inode), mds,
cap == ci->i_auth_cap ? "auth " : "", cap);
spin_unlock(&ci->i_ceph_lock);
out:
/* avoid calling iput_final() while holding mdsc->mutex or
* in mds dispatch threads */
ceph_async_iput(inode);
return mds;
random:
if (random)
*random = true;
mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
dout("%s chose random mds%d\n", __func__, mds);
return mds;
}
/*
* session messages
*/
static struct ceph_msg *create_session_msg(u32 op, u64 seq)
{
struct ceph_msg *msg;
struct ceph_mds_session_head *h;
msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
false);
if (!msg) {
pr_err("create_session_msg ENOMEM creating msg\n");
return NULL;
}
h = msg->front.iov_base;
h->op = cpu_to_le32(op);
h->seq = cpu_to_le64(seq);
return msg;
}
static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
#define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
static int encode_supported_features(void **p, void *end)
{
static const size_t count = ARRAY_SIZE(feature_bits);
if (count > 0) {
size_t i;
size_t size = FEATURE_BYTES(count);
if (WARN_ON_ONCE(*p + 4 + size > end))
return -ERANGE;
ceph_encode_32(p, size);
memset(*p, 0, size);
for (i = 0; i < count; i++)
((unsigned char*)(*p))[i / 8] |= BIT(feature_bits[i] % 8);
*p += size;
} else {
if (WARN_ON_ONCE(*p + 4 > end))
return -ERANGE;
ceph_encode_32(p, 0);
}
return 0;
}
static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED;
#define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8)
static int encode_metric_spec(void **p, void *end)
{
static const size_t count = ARRAY_SIZE(metric_bits);
/* header */
if (WARN_ON_ONCE(*p + 2 > end))
return -ERANGE;
ceph_encode_8(p, 1); /* version */
ceph_encode_8(p, 1); /* compat */
if (count > 0) {
size_t i;
size_t size = METRIC_BYTES(count);
if (WARN_ON_ONCE(*p + 4 + 4 + size > end))
return -ERANGE;
/* metric spec info length */
ceph_encode_32(p, 4 + size);
/* metric spec */
ceph_encode_32(p, size);
memset(*p, 0, size);
for (i = 0; i < count; i++)
((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8);
*p += size;
} else {
if (WARN_ON_ONCE(*p + 4 + 4 > end))
return -ERANGE;
/* metric spec info length */
ceph_encode_32(p, 4);
/* metric spec */
ceph_encode_32(p, 0);
}
return 0;
}
/*
* session message, specialization for CEPH_SESSION_REQUEST_OPEN
* to include additional client metadata fields.
*/
static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
{
struct ceph_msg *msg;
struct ceph_mds_session_head *h;
int i;
int extra_bytes = 0;
int metadata_key_count = 0;
struct ceph_options *opt = mdsc->fsc->client->options;
struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
size_t size, count;
void *p, *end;
int ret;
const char* metadata[][2] = {
{"hostname", mdsc->nodename},
{"kernel_version", init_utsname()->release},
{"entity_id", opt->name ? : ""},
{"root", fsopt->server_path ? : "/"},
{NULL, NULL}
};
/* Calculate serialized length of metadata */
extra_bytes = 4; /* map length */
for (i = 0; metadata[i][0]; ++i) {
extra_bytes += 8 + strlen(metadata[i][0]) +
strlen(metadata[i][1]);
metadata_key_count++;
}
/* supported feature */
size = 0;
count = ARRAY_SIZE(feature_bits);
if (count > 0)
size = FEATURE_BYTES(count);
extra_bytes += 4 + size;
/* metric spec */
size = 0;
count = ARRAY_SIZE(metric_bits);
if (count > 0)
size = METRIC_BYTES(count);
extra_bytes += 2 + 4 + 4 + size;
/* Allocate the message */
msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
GFP_NOFS, false);
if (!msg) {
pr_err("create_session_msg ENOMEM creating msg\n");
return ERR_PTR(-ENOMEM);
}
p = msg->front.iov_base;
end = p + msg->front.iov_len;
h = p;
h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
h->seq = cpu_to_le64(seq);
/*
* Serialize client metadata into waiting buffer space, using
* the format that userspace expects for map<string, string>
*
* ClientSession messages with metadata are v4
*/
msg->hdr.version = cpu_to_le16(4);
msg->hdr.compat_version = cpu_to_le16(1);
/* The write pointer, following the session_head structure */
p += sizeof(*h);
/* Number of entries in the map */
ceph_encode_32(&p, metadata_key_count);
/* Two length-prefixed strings for each entry in the map */
for (i = 0; metadata[i][0]; ++i) {
size_t const key_len = strlen(metadata[i][0]);
size_t const val_len = strlen(metadata[i][1]);
ceph_encode_32(&p, key_len);
memcpy(p, metadata[i][0], key_len);
p += key_len;
ceph_encode_32(&p, val_len);
memcpy(p, metadata[i][1], val_len);
p += val_len;
}
ret = encode_supported_features(&p, end);
if (ret) {
pr_err("encode_supported_features failed!\n");
ceph_msg_put(msg);
return ERR_PTR(ret);
}
ret = encode_metric_spec(&p, end);
if (ret) {
pr_err("encode_metric_spec failed!\n");
ceph_msg_put(msg);
return ERR_PTR(ret);
}
msg->front.iov_len = p - msg->front.iov_base;
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
return msg;
}
/*
* send session open request.
*
* called under mdsc->mutex
*/
static int __open_session(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_msg *msg;
int mstate;
int mds = session->s_mds;
/* wait for mds to go active? */
mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
dout("open_session to mds%d (%s)\n", mds,
ceph_mds_state_name(mstate));
session->s_state = CEPH_MDS_SESSION_OPENING;
session->s_renew_requested = jiffies;
/* send connect message */
msg = create_session_open_msg(mdsc, session->s_seq);
if (IS_ERR(msg))
return PTR_ERR(msg);
ceph_con_send(&session->s_con, msg);
return 0;
}
/*
* open sessions for any export targets for the given mds
*
* called under mdsc->mutex
*/
static struct ceph_mds_session *
__open_export_target_session(struct ceph_mds_client *mdsc, int target)
{
struct ceph_mds_session *session;
int ret;
session = __ceph_lookup_mds_session(mdsc, target);
if (!session) {
session = register_session(mdsc, target);
if (IS_ERR(session))
return session;
}
if (session->s_state == CEPH_MDS_SESSION_NEW ||
session->s_state == CEPH_MDS_SESSION_CLOSING) {
ret = __open_session(mdsc, session);
if (ret)
return ERR_PTR(ret);
}
return session;
}
struct ceph_mds_session *
ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
{
struct ceph_mds_session *session;
dout("open_export_target_session to mds%d\n", target);
mutex_lock(&mdsc->mutex);
session = __open_export_target_session(mdsc, target);
mutex_unlock(&mdsc->mutex);
return session;
}
static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_mds_info *mi;
struct ceph_mds_session *ts;
int i, mds = session->s_mds;
if (mds >= mdsc->mdsmap->possible_max_rank)
return;
mi = &mdsc->mdsmap->m_info[mds];
dout("open_export_target_sessions for mds%d (%d targets)\n",
session->s_mds, mi->num_export_targets);
for (i = 0; i < mi->num_export_targets; i++) {
ts = __open_export_target_session(mdsc, mi->export_targets[i]);
if (!IS_ERR(ts))
ceph_put_mds_session(ts);
}
}
void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
mutex_lock(&mdsc->mutex);
__open_export_target_sessions(mdsc, session);
mutex_unlock(&mdsc->mutex);
}
/*
* session caps
*/
static void detach_cap_releases(struct ceph_mds_session *session,
struct list_head *target)
{
lockdep_assert_held(&session->s_cap_lock);
list_splice_init(&session->s_cap_releases, target);
session->s_num_cap_releases = 0;
dout("dispose_cap_releases mds%d\n", session->s_mds);
}
static void dispose_cap_releases(struct ceph_mds_client *mdsc,
struct list_head *dispose)
{
while (!list_empty(dispose)) {
struct ceph_cap *cap;
/* zero out the in-progress message */
cap = list_first_entry(dispose, struct ceph_cap, session_caps);
list_del(&cap->session_caps);
ceph_put_cap(mdsc, cap);
}
}
static void cleanup_session_requests(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_mds_request *req;
struct rb_node *p;
struct ceph_inode_info *ci;
dout("cleanup_session_requests mds%d\n", session->s_mds);
mutex_lock(&mdsc->mutex);
while (!list_empty(&session->s_unsafe)) {
req = list_first_entry(&session->s_unsafe,
struct ceph_mds_request, r_unsafe_item);
pr_warn_ratelimited(" dropping unsafe request %llu\n",
req->r_tid);
if (req->r_target_inode) {
/* dropping unsafe change of inode's attributes */
ci = ceph_inode(req->r_target_inode);
errseq_set(&ci->i_meta_err, -EIO);
}
if (req->r_unsafe_dir) {
/* dropping unsafe directory operation */
ci = ceph_inode(req->r_unsafe_dir);
errseq_set(&ci->i_meta_err, -EIO);
}
__unregister_request(mdsc, req);
}
/* zero r_attempts, so kick_requests() will re-send requests */
p = rb_first(&mdsc->request_tree);
while (p) {
req = rb_entry(p, struct ceph_mds_request, r_node);
p = rb_next(p);
if (req->r_session &&
req->r_session->s_mds == session->s_mds)
req->r_attempts = 0;
}
mutex_unlock(&mdsc->mutex);
}
/*
* Helper to safely iterate over all caps associated with a session, with
* special care taken to handle a racing __ceph_remove_cap().
*
* Caller must hold session s_mutex.
*/
int ceph_iterate_session_caps(struct ceph_mds_session *session,
int (*cb)(struct inode *, struct ceph_cap *,
void *), void *arg)
{
struct list_head *p;
struct ceph_cap *cap;
struct inode *inode, *last_inode = NULL;
struct ceph_cap *old_cap = NULL;
int ret;
dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
spin_lock(&session->s_cap_lock);
p = session->s_caps.next;
while (p != &session->s_caps) {
cap = list_entry(p, struct ceph_cap, session_caps);
inode = igrab(&cap->ci->vfs_inode);
if (!inode) {
p = p->next;
continue;
}
session->s_cap_iterator = cap;
spin_unlock(&session->s_cap_lock);
if (last_inode) {
/* avoid calling iput_final() while holding
* s_mutex or in mds dispatch threads */
ceph_async_iput(last_inode);
last_inode = NULL;
}
if (old_cap) {
ceph_put_cap(session->s_mdsc, old_cap);
old_cap = NULL;
}
ret = cb(inode, cap, arg);
last_inode = inode;
spin_lock(&session->s_cap_lock);
p = p->next;
if (!cap->ci) {
dout("iterate_session_caps finishing cap %p removal\n",
cap);
BUG_ON(cap->session != session);
cap->session = NULL;
list_del_init(&cap->session_caps);
session->s_nr_caps--;
atomic64_dec(&session->s_mdsc->metric.total_caps);
if (cap->queue_release)
__ceph_queue_cap_release(session, cap);
else
old_cap = cap; /* put_cap it w/o locks held */
}
if (ret < 0)
goto out;
}
ret = 0;
out:
session->s_cap_iterator = NULL;
spin_unlock(&session->s_cap_lock);
ceph_async_iput(last_inode);
if (old_cap)
ceph_put_cap(session->s_mdsc, old_cap);
return ret;
}
static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
void *arg)
{
struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
struct ceph_inode_info *ci = ceph_inode(inode);
LIST_HEAD(to_remove);
bool dirty_dropped = false;
bool invalidate = false;
dout("removing cap %p, ci is %p, inode is %p\n",
cap, ci, &ci->vfs_inode);
spin_lock(&ci->i_ceph_lock);
__ceph_remove_cap(cap, false);
if (!ci->i_auth_cap) {
struct ceph_cap_flush *cf;
struct ceph_mds_client *mdsc = fsc->mdsc;
if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
if (inode->i_data.nrpages > 0)
invalidate = true;
if (ci->i_wrbuffer_ref > 0)
mapping_set_error(&inode->i_data, -EIO);
}
while (!list_empty(&ci->i_cap_flush_list)) {
cf = list_first_entry(&ci->i_cap_flush_list,
struct ceph_cap_flush, i_list);
list_move(&cf->i_list, &to_remove);
}
spin_lock(&mdsc->cap_dirty_lock);
list_for_each_entry(cf, &to_remove, i_list)
list_del(&cf->g_list);
if (!list_empty(&ci->i_dirty_item)) {
pr_warn_ratelimited(
" dropping dirty %s state for %p %lld\n",
ceph_cap_string(ci->i_dirty_caps),
inode, ceph_ino(inode));
ci->i_dirty_caps = 0;
list_del_init(&ci->i_dirty_item);
dirty_dropped = true;
}
if (!list_empty(&ci->i_flushing_item)) {
pr_warn_ratelimited(
" dropping dirty+flushing %s state for %p %lld\n",
ceph_cap_string(ci->i_flushing_caps),
inode, ceph_ino(inode));
ci->i_flushing_caps = 0;
list_del_init(&ci->i_flushing_item);
mdsc->num_cap_flushing--;
dirty_dropped = true;
}
spin_unlock(&mdsc->cap_dirty_lock);
if (dirty_dropped) {
errseq_set(&ci->i_meta_err, -EIO);
if (ci->i_wrbuffer_ref_head == 0 &&
ci->i_wr_ref == 0 &&
ci->i_dirty_caps == 0 &&
ci->i_flushing_caps == 0) {
ceph_put_snap_context(ci->i_head_snapc);
ci->i_head_snapc = NULL;
}
}
if (atomic_read(&ci->i_filelock_ref) > 0) {
/* make further file lock syscall return -EIO */
ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
pr_warn_ratelimited(" dropping file locks for %p %lld\n",
inode, ceph_ino(inode));
}
if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
ci->i_prealloc_cap_flush = NULL;
}
}
spin_unlock(&ci->i_ceph_lock);
while (!list_empty(&to_remove)) {
struct ceph_cap_flush *cf;
cf = list_first_entry(&to_remove,
struct ceph_cap_flush, i_list);
list_del(&cf->i_list);
ceph_free_cap_flush(cf);
}
wake_up_all(&ci->i_cap_wq);
if (invalidate)
ceph_queue_invalidate(inode);
if (dirty_dropped)
iput(inode);
return 0;
}
/*
* caller must hold session s_mutex
*/
static void remove_session_caps(struct ceph_mds_session *session)
{
struct ceph_fs_client *fsc = session->s_mdsc->fsc;
struct super_block *sb = fsc->sb;
LIST_HEAD(dispose);
dout("remove_session_caps on %p\n", session);
ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
wake_up_all(&fsc->mdsc->cap_flushing_wq);
spin_lock(&session->s_cap_lock);
if (session->s_nr_caps > 0) {
struct inode *inode;
struct ceph_cap *cap, *prev = NULL;
struct ceph_vino vino;
/*
* iterate_session_caps() skips inodes that are being
* deleted, we need to wait until deletions are complete.
* __wait_on_freeing_inode() is designed for the job,
* but it is not exported, so use lookup inode function
* to access it.
*/
while (!list_empty(&session->s_caps)) {
cap = list_entry(session->s_caps.next,
struct ceph_cap, session_caps);
if (cap == prev)
break;
prev = cap;
vino = cap->ci->i_vino;
spin_unlock(&session->s_cap_lock);
inode = ceph_find_inode(sb, vino);
/* avoid calling iput_final() while holding s_mutex */
ceph_async_iput(inode);
spin_lock(&session->s_cap_lock);
}
}
// drop cap expires and unlock s_cap_lock
detach_cap_releases(session, &dispose);
BUG_ON(session->s_nr_caps > 0);
BUG_ON(!list_empty(&session->s_cap_flushing));
spin_unlock(&session->s_cap_lock);
dispose_cap_releases(session->s_mdsc, &dispose);
}
enum {
RECONNECT,
RENEWCAPS,
FORCE_RO,
};
/*
* wake up any threads waiting on this session's caps. if the cap is
* old (didn't get renewed on the client reconnect), remove it now.
*
* caller must hold s_mutex.
*/
static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
void *arg)
{
struct ceph_inode_info *ci = ceph_inode(inode);
unsigned long ev = (unsigned long)arg;
if (ev == RECONNECT) {
spin_lock(&ci->i_ceph_lock);
ci->i_wanted_max_size = 0;
ci->i_requested_max_size = 0;
spin_unlock(&ci->i_ceph_lock);
} else if (ev == RENEWCAPS) {
if (cap->cap_gen < cap->session->s_cap_gen) {
/* mds did not re-issue stale cap */
spin_lock(&ci->i_ceph_lock);
cap->issued = cap->implemented = CEPH_CAP_PIN;
spin_unlock(&ci->i_ceph_lock);
}
} else if (ev == FORCE_RO) {
}
wake_up_all(&ci->i_cap_wq);
return 0;
}
static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
{
dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
ceph_iterate_session_caps(session, wake_up_session_cb,
(void *)(unsigned long)ev);
}
/*
* Send periodic message to MDS renewing all currently held caps. The
* ack will reset the expiration for all caps from this session.
*
* caller holds s_mutex
*/
static int send_renew_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_msg *msg;
int state;
if (time_after_eq(jiffies, session->s_cap_ttl) &&
time_after_eq(session->s_cap_ttl, session->s_renew_requested))
pr_info("mds%d caps stale\n", session->s_mds);
session->s_renew_requested = jiffies;
/* do not try to renew caps until a recovering mds has reconnected
* with its clients. */
state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
if (state < CEPH_MDS_STATE_RECONNECT) {
dout("send_renew_caps ignoring mds%d (%s)\n",
session->s_mds, ceph_mds_state_name(state));
return 0;
}
dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
ceph_mds_state_name(state));
msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
++session->s_renew_seq);
if (!msg)
return -ENOMEM;
ceph_con_send(&session->s_con, msg);
return 0;
}
static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session, u64 seq)
{
struct ceph_msg *msg;
dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
session->s_mds, ceph_session_state_name(session->s_state), seq);
msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
if (!msg)
return -ENOMEM;
ceph_con_send(&session->s_con, msg);
return 0;
}
/*
* Note new cap ttl, and any transition from stale -> not stale (fresh?).
*
* Called under session->s_mutex
*/
static void renewed_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session, int is_renew)
{
int was_stale;
int wake = 0;
spin_lock(&session->s_cap_lock);
was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
session->s_cap_ttl = session->s_renew_requested +
mdsc->mdsmap->m_session_timeout*HZ;
if (was_stale) {
if (time_before(jiffies, session->s_cap_ttl)) {
pr_info("mds%d caps renewed\n", session->s_mds);
wake = 1;
} else {
pr_info("mds%d caps still stale\n", session->s_mds);
}
}
dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
spin_unlock(&session->s_cap_lock);
if (wake)
wake_up_session_caps(session, RENEWCAPS);
}
/*
* send a session close request
*/
static int request_close_session(struct ceph_mds_session *session)
{
struct ceph_msg *msg;
dout("request_close_session mds%d state %s seq %lld\n",
session->s_mds, ceph_session_state_name(session->s_state),
session->s_seq);
msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
if (!msg)
return -ENOMEM;
ceph_con_send(&session->s_con, msg);
return 1;
}
/*
* Called with s_mutex held.
*/
static int __close_session(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
return 0;
session->s_state = CEPH_MDS_SESSION_CLOSING;
return request_close_session(session);
}
static bool drop_negative_children(struct dentry *dentry)
{
struct dentry *child;
bool all_negative = true;
if (!d_is_dir(dentry))
goto out;
spin_lock(&dentry->d_lock);
list_for_each_entry(child, &dentry->d_subdirs, d_child) {
if (d_really_is_positive(child)) {
all_negative = false;
break;
}
}
spin_unlock(&dentry->d_lock);
if (all_negative)
shrink_dcache_parent(dentry);
out:
return all_negative;
}
/*
* Trim old(er) caps.
*
* Because we can't cache an inode without one or more caps, we do
* this indirectly: if a cap is unused, we prune its aliases, at which
* point the inode will hopefully get dropped to.
*
* Yes, this is a bit sloppy. Our only real goal here is to respond to
* memory pressure from the MDS, though, so it needn't be perfect.
*/
static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
{
int *remaining = arg;
struct ceph_inode_info *ci = ceph_inode(inode);
int used, wanted, oissued, mine;
if (*remaining <= 0)
return -1;
spin_lock(&ci->i_ceph_lock);
mine = cap->issued | cap->implemented;
used = __ceph_caps_used(ci);
wanted = __ceph_caps_file_wanted(ci);
oissued = __ceph_caps_issued_other(ci, cap);
dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
ceph_cap_string(used), ceph_cap_string(wanted));
if (cap == ci->i_auth_cap) {
if (ci->i_dirty_caps || ci->i_flushing_caps ||
!list_empty(&ci->i_cap_snaps))
goto out;
if ((used | wanted) & CEPH_CAP_ANY_WR)
goto out;
/* Note: it's possible that i_filelock_ref becomes non-zero
* after dropping auth caps. It doesn't hurt because reply
* of lock mds request will re-add auth caps. */
if (atomic_read(&ci->i_filelock_ref) > 0)
goto out;
}
/* The inode has cached pages, but it's no longer used.
* we can safely drop it */
if (S_ISREG(inode->i_mode) &&
wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
!(oissued & CEPH_CAP_FILE_CACHE)) {
used = 0;
oissued = 0;
}
if ((used | wanted) & ~oissued & mine)
goto out; /* we need these caps */
if (oissued) {
/* we aren't the only cap.. just remove us */
__ceph_remove_cap(cap, true);
(*remaining)--;
} else {
struct dentry *dentry;
/* try dropping referring dentries */
spin_unlock(&ci->i_ceph_lock);
dentry = d_find_any_alias(inode);
if (dentry && drop_negative_children(dentry)) {
int count;
dput(dentry);
d_prune_aliases(inode);
count = atomic_read(&inode->i_count);
if (count == 1)
(*remaining)--;
dout("trim_caps_cb %p cap %p pruned, count now %d\n",
inode, cap, count);
} else {
dput(dentry);
}
return 0;
}
out:
spin_unlock(&ci->i_ceph_lock);
return 0;
}
/*
* Trim session cap count down to some max number.
*/
int ceph_trim_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
int max_caps)
{
int trim_caps = session->s_nr_caps - max_caps;
dout("trim_caps mds%d start: %d / %d, trim %d\n",
session->s_mds, session->s_nr_caps, max_caps, trim_caps);
if (trim_caps > 0) {
int remaining = trim_caps;
ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
session->s_mds, session->s_nr_caps, max_caps,
trim_caps - remaining);
}
ceph_flush_cap_releases(mdsc, session);
return 0;
}
static int check_caps_flush(struct ceph_mds_client *mdsc,
u64 want_flush_tid)
{
int ret = 1;
spin_lock(&mdsc->cap_dirty_lock);
if (!list_empty(&mdsc->cap_flush_list)) {
struct ceph_cap_flush *cf =
list_first_entry(&mdsc->cap_flush_list,
struct ceph_cap_flush, g_list);
if (cf->tid <= want_flush_tid) {
dout("check_caps_flush still flushing tid "
"%llu <= %llu\n", cf->tid, want_flush_tid);
ret = 0;
}
}
spin_unlock(&mdsc->cap_dirty_lock);
return ret;
}
/*
* flush all dirty inode data to disk.
*
* returns true if we've flushed through want_flush_tid
*/
static void wait_caps_flush(struct ceph_mds_client *mdsc,
u64 want_flush_tid)
{
dout("check_caps_flush want %llu\n", want_flush_tid);
wait_event(mdsc->cap_flushing_wq,
check_caps_flush(mdsc, want_flush_tid));
dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
}
/*
* called under s_mutex
*/
static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_msg *msg = NULL;
struct ceph_mds_cap_release *head;
struct ceph_mds_cap_item *item;
struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
struct ceph_cap *cap;
LIST_HEAD(tmp_list);
int num_cap_releases;
__le32 barrier, *cap_barrier;
down_read(&osdc->lock);
barrier = cpu_to_le32(osdc->epoch_barrier);
up_read(&osdc->lock);
spin_lock(&session->s_cap_lock);
again:
list_splice_init(&session->s_cap_releases, &tmp_list);
num_cap_releases = session->s_num_cap_releases;
session->s_num_cap_releases = 0;
spin_unlock(&session->s_cap_lock);
while (!list_empty(&tmp_list)) {
if (!msg) {
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
PAGE_SIZE, GFP_NOFS, false);
if (!msg)
goto out_err;
head = msg->front.iov_base;
head->num = cpu_to_le32(0);
msg->front.iov_len = sizeof(*head);
msg->hdr.version = cpu_to_le16(2);
msg->hdr.compat_version = cpu_to_le16(1);
}
cap = list_first_entry(&tmp_list, struct ceph_cap,
session_caps);
list_del(&cap->session_caps);
num_cap_releases--;
head = msg->front.iov_base;
put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
&head->num);
item = msg->front.iov_base + msg->front.iov_len;
item->ino = cpu_to_le64(cap->cap_ino);
item->cap_id = cpu_to_le64(cap->cap_id);
item->migrate_seq = cpu_to_le32(cap->mseq);
item->seq = cpu_to_le32(cap->issue_seq);
msg->front.iov_len += sizeof(*item);
ceph_put_cap(mdsc, cap);
if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
// Append cap_barrier field
cap_barrier = msg->front.iov_base + msg->front.iov_len;
*cap_barrier = barrier;
msg->front.iov_len += sizeof(*cap_barrier);
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
ceph_con_send(&session->s_con, msg);
msg = NULL;
}
}
BUG_ON(num_cap_releases != 0);
spin_lock(&session->s_cap_lock);
if (!list_empty(&session->s_cap_releases))
goto again;
spin_unlock(&session->s_cap_lock);
if (msg) {
// Append cap_barrier field
cap_barrier = msg->front.iov_base + msg->front.iov_len;
*cap_barrier = barrier;
msg->front.iov_len += sizeof(*cap_barrier);
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
ceph_con_send(&session->s_con, msg);
}
return;
out_err:
pr_err("send_cap_releases mds%d, failed to allocate message\n",
session->s_mds);
spin_lock(&session->s_cap_lock);
list_splice(&tmp_list, &session->s_cap_releases);
session->s_num_cap_releases += num_cap_releases;
spin_unlock(&session->s_cap_lock);
}
static void ceph_cap_release_work(struct work_struct *work)
{
struct ceph_mds_session *session =
container_of(work, struct ceph_mds_session, s_cap_release_work);
mutex_lock(&session->s_mutex);
if (session->s_state == CEPH_MDS_SESSION_OPEN ||
session->s_state == CEPH_MDS_SESSION_HUNG)
ceph_send_cap_releases(session->s_mdsc, session);
mutex_unlock(&session->s_mutex);
ceph_put_mds_session(session);
}
void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
if (mdsc->stopping)
return;
ceph_get_mds_session(session);
if (queue_work(mdsc->fsc->cap_wq,
&session->s_cap_release_work)) {
dout("cap release work queued\n");
} else {
ceph_put_mds_session(session);
dout("failed to queue cap release work\n");
}
}
/*
* caller holds session->s_cap_lock
*/
void __ceph_queue_cap_release(struct ceph_mds_session *session,
struct ceph_cap *cap)
{
list_add_tail(&cap->session_caps, &session->s_cap_releases);
session->s_num_cap_releases++;
if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
ceph_flush_cap_releases(session->s_mdsc, session);
}
static void ceph_cap_reclaim_work(struct work_struct *work)
{
struct ceph_mds_client *mdsc =
container_of(work, struct ceph_mds_client, cap_reclaim_work);
int ret = ceph_trim_dentries(mdsc);
if (ret == -EAGAIN)
ceph_queue_cap_reclaim_work(mdsc);
}
void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
{
if (mdsc->stopping)
return;
if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
dout("caps reclaim work queued\n");
} else {
dout("failed to queue caps release work\n");
}
}
void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
{
int val;
if (!nr)
return;
val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
atomic_set(&mdsc->cap_reclaim_pending, 0);
ceph_queue_cap_reclaim_work(mdsc);
}
}
/*
* requests
*/
int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
struct inode *dir)
{
struct ceph_inode_info *ci = ceph_inode(dir);
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
size_t size = sizeof(struct ceph_mds_reply_dir_entry);
unsigned int num_entries;
int order;
spin_lock(&ci->i_ceph_lock);
num_entries = ci->i_files + ci->i_subdirs;
spin_unlock(&ci->i_ceph_lock);
num_entries = max(num_entries, 1U);
num_entries = min(num_entries, opt->max_readdir);
order = get_order(size * num_entries);
while (order >= 0) {
rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
__GFP_NOWARN,
order);
if (rinfo->dir_entries)
break;
order--;
}
if (!rinfo->dir_entries)
return -ENOMEM;
num_entries = (PAGE_SIZE << order) / size;
num_entries = min(num_entries, opt->max_readdir);
rinfo->dir_buf_size = PAGE_SIZE << order;
req->r_num_caps = num_entries + 1;
req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
return 0;
}
/*
* Create an mds request.
*/
struct ceph_mds_request *
ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
{
struct ceph_mds_request *req;
req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
if (!req)
return ERR_PTR(-ENOMEM);
mutex_init(&req->r_fill_mutex);
req->r_mdsc = mdsc;
req->r_started = jiffies;
req->r_start_latency = ktime_get();
req->r_resend_mds = -1;
INIT_LIST_HEAD(&req->r_unsafe_dir_item);
INIT_LIST_HEAD(&req->r_unsafe_target_item);
req->r_fmode = -1;
kref_init(&req->r_kref);
RB_CLEAR_NODE(&req->r_node);
INIT_LIST_HEAD(&req->r_wait);
init_completion(&req->r_completion);
init_completion(&req->r_safe_completion);
INIT_LIST_HEAD(&req->r_unsafe_item);
ktime_get_coarse_real_ts64(&req->r_stamp);
req->r_op = op;
req->r_direct_mode = mode;
return req;
}
/*
* return oldest (lowest) request, tid in request tree, 0 if none.
*
* called under mdsc->mutex.
*/
static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
{
if (RB_EMPTY_ROOT(&mdsc->request_tree))
return NULL;
return rb_entry(rb_first(&mdsc->request_tree),
struct ceph_mds_request, r_node);
}
static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
{
return mdsc->oldest_tid;
}
/*
* Build a dentry's path. Allocate on heap; caller must kfree. Based
* on build_path_from_dentry in fs/cifs/dir.c.
*
* If @stop_on_nosnap, generate path relative to the first non-snapped
* inode.
*
* Encode hidden .snap dirs as a double /, i.e.
* foo/.snap/bar -> foo//bar
*/
char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
int stop_on_nosnap)
{
struct dentry *temp;
char *path;
int pos;
unsigned seq;
u64 base;
if (!dentry)
return ERR_PTR(-EINVAL);
path = __getname();
if (!path)
return ERR_PTR(-ENOMEM);
retry:
pos = PATH_MAX - 1;
path[pos] = '\0';
seq = read_seqbegin(&rename_lock);
rcu_read_lock();
temp = dentry;
for (;;) {
struct inode *inode;
spin_lock(&temp->d_lock);
inode = d_inode(temp);
if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
dout("build_path path+%d: %p SNAPDIR\n",
pos, temp);
} else if (stop_on_nosnap && inode && dentry != temp &&
ceph_snap(inode) == CEPH_NOSNAP) {
spin_unlock(&temp->d_lock);
pos++; /* get rid of any prepended '/' */
break;
} else {
pos -= temp->d_name.len;
if (pos < 0) {
spin_unlock(&temp->d_lock);
break;
}
memcpy(path + pos, temp->d_name.name, temp->d_name.len);
}
spin_unlock(&temp->d_lock);
temp = READ_ONCE(temp->d_parent);
/* Are we at the root? */
if (IS_ROOT(temp))
break;
/* Are we out of buffer? */
if (--pos < 0)
break;
path[pos] = '/';
}
base = ceph_ino(d_inode(temp));
rcu_read_unlock();
if (read_seqretry(&rename_lock, seq))
goto retry;
if (pos < 0) {
/*
* A rename didn't occur, but somehow we didn't end up where
* we thought we would. Throw a warning and try again.
*/
pr_warn("build_path did not end path lookup where "
"expected, pos is %d\n", pos);
goto retry;
}
*pbase = base;
*plen = PATH_MAX - 1 - pos;
dout("build_path on %p %d built %llx '%.*s'\n",
dentry, d_count(dentry), base, *plen, path + pos);
return path + pos;
}
static int build_dentry_path(struct dentry *dentry, struct inode *dir,
const char **ppath, int *ppathlen, u64 *pino,
bool *pfreepath, bool parent_locked)
{
char *path;
rcu_read_lock();
if (!dir)
dir = d_inode_rcu(dentry->d_parent);
if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
*pino = ceph_ino(dir);
rcu_read_unlock();
*ppath = dentry->d_name.name;
*ppathlen = dentry->d_name.len;
return 0;
}
rcu_read_unlock();
path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
if (IS_ERR(path))
return PTR_ERR(path);
*ppath = path;
*pfreepath = true;
return 0;
}
static int build_inode_path(struct inode *inode,
const char **ppath, int *ppathlen, u64 *pino,
bool *pfreepath)
{
struct dentry *dentry;
char *path;
if (ceph_snap(inode) == CEPH_NOSNAP) {
*pino = ceph_ino(inode);
*ppathlen = 0;
return 0;
}
dentry = d_find_alias(inode);
path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
dput(dentry);
if (IS_ERR(path))
return PTR_ERR(path);
*ppath = path;
*pfreepath = true;
return 0;
}
/*
* request arguments may be specified via an inode *, a dentry *, or
* an explicit ino+path.
*/
static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
struct inode *rdiri, const char *rpath,
u64 rino, const char **ppath, int *pathlen,
u64 *ino, bool *freepath, bool parent_locked)
{
int r = 0;
if (rinode) {
r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
ceph_snap(rinode));
} else if (rdentry) {
r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
freepath, parent_locked);
dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
*ppath);
} else if (rpath || rino) {
*ino = rino;
*ppath = rpath;
*pathlen = rpath ? strlen(rpath) : 0;
dout(" path %.*s\n", *pathlen, rpath);
}
return r;
}
static void encode_timestamp_and_gids(void **p,
const struct ceph_mds_request *req)
{
struct ceph_timespec ts;
int i;
ceph_encode_timespec64(&ts, &req->r_stamp);
ceph_encode_copy(p, &ts, sizeof(ts));
/* gid_list */
ceph_encode_32(p, req->r_cred->group_info->ngroups);
for (i = 0; i < req->r_cred->group_info->ngroups; i++)
ceph_encode_64(p, from_kgid(&init_user_ns,
req->r_cred->group_info->gid[i]));
}
/*
* called under mdsc->mutex
*/
static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
struct ceph_mds_request *req,
bool drop_cap_releases)
{
int mds = session->s_mds;
struct ceph_mds_client *mdsc = session->s_mdsc;
struct ceph_msg *msg;
struct ceph_mds_request_head_old *head;
const char *path1 = NULL;
const char *path2 = NULL;
u64 ino1 = 0, ino2 = 0;
int pathlen1 = 0, pathlen2 = 0;
bool freepath1 = false, freepath2 = false;
int len;
u16 releases;
void *p, *end;
int ret;
bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
ret = set_request_path_attr(req->r_inode, req->r_dentry,
req->r_parent, req->r_path1, req->r_ino1.ino,
&path1, &pathlen1, &ino1, &freepath1,
test_bit(CEPH_MDS_R_PARENT_LOCKED,
&req->r_req_flags));
if (ret < 0) {
msg = ERR_PTR(ret);
goto out;
}
/* If r_old_dentry is set, then assume that its parent is locked */
ret = set_request_path_attr(NULL, req->r_old_dentry,
req->r_old_dentry_dir,
req->r_path2, req->r_ino2.ino,
&path2, &pathlen2, &ino2, &freepath2, true);
if (ret < 0) {
msg = ERR_PTR(ret);
goto out_free1;
}
len = legacy ? sizeof(*head) : sizeof(struct ceph_mds_request_head);
len += pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
sizeof(struct ceph_timespec);
len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
/* calculate (max) length for cap releases */
len += sizeof(struct ceph_mds_request_release) *
(!!req->r_inode_drop + !!req->r_dentry_drop +
!!req->r_old_inode_drop + !!req->r_old_dentry_drop);
if (req->r_dentry_drop)
len += pathlen1;
if (req->r_old_dentry_drop)
len += pathlen2;
msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
if (!msg) {
msg = ERR_PTR(-ENOMEM);
goto out_free2;
}
msg->hdr.tid = cpu_to_le64(req->r_tid);
/*
* The old ceph_mds_request_head didn't contain a version field, and
* one was added when we moved the message version from 3->4.
*/
if (legacy) {
msg->hdr.version = cpu_to_le16(3);
head = msg->front.iov_base;
p = msg->front.iov_base + sizeof(*head);
} else {
struct ceph_mds_request_head *new_head = msg->front.iov_base;
msg->hdr.version = cpu_to_le16(4);
new_head->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
head = (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
p = msg->front.iov_base + sizeof(*new_head);
}
end = msg->front.iov_base + msg->front.iov_len;
head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
head->op = cpu_to_le32(req->r_op);
head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
req->r_cred->fsuid));
head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
req->r_cred->fsgid));
head->ino = cpu_to_le64(req->r_deleg_ino);
head->args = req->r_args;
ceph_encode_filepath(&p, end, ino1, path1);
ceph_encode_filepath(&p, end, ino2, path2);
/* make note of release offset, in case we need to replay */
req->r_request_release_offset = p - msg->front.iov_base;
/* cap releases */
releases = 0;
if (req->r_inode_drop)
releases += ceph_encode_inode_release(&p,
req->r_inode ? req->r_inode : d_inode(req->r_dentry),
mds, req->r_inode_drop, req->r_inode_unless,
req->r_op == CEPH_MDS_OP_READDIR);
if (req->r_dentry_drop)
releases += ceph_encode_dentry_release(&p, req->r_dentry,
req->r_parent, mds, req->r_dentry_drop,
req->r_dentry_unless);
if (req->r_old_dentry_drop)
releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
req->r_old_dentry_dir, mds,
req->r_old_dentry_drop,
req->r_old_dentry_unless);
if (req->r_old_inode_drop)
releases += ceph_encode_inode_release(&p,
d_inode(req->r_old_dentry),
mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
if (drop_cap_releases) {
releases = 0;
p = msg->front.iov_base + req->r_request_release_offset;
}
head->num_releases = cpu_to_le16(releases);
encode_timestamp_and_gids(&p, req);
if (WARN_ON_ONCE(p > end)) {
ceph_msg_put(msg);
msg = ERR_PTR(-ERANGE);
goto out_free2;
}
msg->front.iov_len = p - msg->front.iov_base;
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
if (req->r_pagelist) {
struct ceph_pagelist *pagelist = req->r_pagelist;
ceph_msg_data_add_pagelist(msg, pagelist);
msg->hdr.data_len = cpu_to_le32(pagelist->length);
} else {
msg->hdr.data_len = 0;
}
msg->hdr.data_off = cpu_to_le16(0);
out_free2:
if (freepath2)
ceph_mdsc_free_path((char *)path2, pathlen2);
out_free1:
if (freepath1)
ceph_mdsc_free_path((char *)path1, pathlen1);
out:
return msg;
}
/*
* called under mdsc->mutex if error, under no mutex if
* success.
*/
static void complete_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
req->r_end_latency = ktime_get();
if (req->r_callback)
req->r_callback(mdsc, req);
complete_all(&req->r_completion);
}
static struct ceph_mds_request_head_old *
find_old_request_head(void *p, u64 features)
{
bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
struct ceph_mds_request_head *new_head;
if (legacy)
return (struct ceph_mds_request_head_old *)p;
new_head = (struct ceph_mds_request_head *)p;
return (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
}
/*
* called under mdsc->mutex
*/
static int __prepare_send_request(struct ceph_mds_session *session,
struct ceph_mds_request *req,
bool drop_cap_releases)
{
int mds = session->s_mds;
struct ceph_mds_client *mdsc = session->s_mdsc;
struct ceph_mds_request_head_old *rhead;
struct ceph_msg *msg;
int flags = 0;
req->r_attempts++;
if (req->r_inode) {
struct ceph_cap *cap =
ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
if (cap)
req->r_sent_on_mseq = cap->mseq;
else
req->r_sent_on_mseq = -1;
}
dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
void *p;
/*
* Replay. Do not regenerate message (and rebuild
* paths, etc.); just use the original message.
* Rebuilding paths will break for renames because
* d_move mangles the src name.
*/
msg = req->r_request;
rhead = find_old_request_head(msg->front.iov_base,
session->s_con.peer_features);
flags = le32_to_cpu(rhead->flags);
flags |= CEPH_MDS_FLAG_REPLAY;
rhead->flags = cpu_to_le32(flags);
if (req->r_target_inode)
rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
rhead->num_retry = req->r_attempts - 1;
/* remove cap/dentry releases from message */
rhead->num_releases = 0;
p = msg->front.iov_base + req->r_request_release_offset;
encode_timestamp_and_gids(&p, req);
msg->front.iov_len = p - msg->front.iov_base;
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
return 0;
}
if (req->r_request) {
ceph_msg_put(req->r_request);
req->r_request = NULL;
}
msg = create_request_message(session, req, drop_cap_releases);
if (IS_ERR(msg)) {
req->r_err = PTR_ERR(msg);
return PTR_ERR(msg);
}
req->r_request = msg;
rhead = find_old_request_head(msg->front.iov_base,
session->s_con.peer_features);
rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
flags |= CEPH_MDS_FLAG_REPLAY;
if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
flags |= CEPH_MDS_FLAG_ASYNC;
if (req->r_parent)
flags |= CEPH_MDS_FLAG_WANT_DENTRY;
rhead->flags = cpu_to_le32(flags);
rhead->num_fwd = req->r_num_fwd;
rhead->num_retry = req->r_attempts - 1;
dout(" r_parent = %p\n", req->r_parent);
return 0;
}
/*
* called under mdsc->mutex
*/
static int __send_request(struct ceph_mds_session *session,
struct ceph_mds_request *req,
bool drop_cap_releases)
{
int err;
err = __prepare_send_request(session, req, drop_cap_releases);
if (!err) {
ceph_msg_get(req->r_request);
ceph_con_send(&session->s_con, req->r_request);
}
return err;
}
/*
* send request, or put it on the appropriate wait list.
*/
static void __do_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
struct ceph_mds_session *session = NULL;
int mds = -1;
int err = 0;
bool random;
if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
__unregister_request(mdsc, req);
return;
}
if (req->r_timeout &&
time_after_eq(jiffies, req->r_started + req->r_timeout)) {
dout("do_request timed out\n");
err = -ETIMEDOUT;
goto finish;
}
if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
dout("do_request forced umount\n");
err = -EIO;
goto finish;
}
if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
if (mdsc->mdsmap_err) {
err = mdsc->mdsmap_err;
dout("do_request mdsmap err %d\n", err);
goto finish;
}
if (mdsc->mdsmap->m_epoch == 0) {
dout("do_request no mdsmap, waiting for map\n");
list_add(&req->r_wait, &mdsc->waiting_for_map);
return;
}
if (!(mdsc->fsc->mount_options->flags &
CEPH_MOUNT_OPT_MOUNTWAIT) &&
!ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
err = -EHOSTUNREACH;
goto finish;
}
}
put_request_session(req);
mds = __choose_mds(mdsc, req, &random);
if (mds < 0 ||
ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
err = -EJUKEBOX;
goto finish;
}
dout("do_request no mds or not active, waiting for map\n");
list_add(&req->r_wait, &mdsc->waiting_for_map);
return;
}
/* get, open session */
session = __ceph_lookup_mds_session(mdsc, mds);
if (!session) {
session = register_session(mdsc, mds);
if (IS_ERR(session)) {
err = PTR_ERR(session);
goto finish;
}
}
req->r_session = ceph_get_mds_session(session);
dout("do_request mds%d session %p state %s\n", mds, session,
ceph_session_state_name(session->s_state));
if (session->s_state != CEPH_MDS_SESSION_OPEN &&
session->s_state != CEPH_MDS_SESSION_HUNG) {
/*
* We cannot queue async requests since the caps and delegated
* inodes are bound to the session. Just return -EJUKEBOX and
* let the caller retry a sync request in that case.
*/
if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
err = -EJUKEBOX;
goto out_session;
}
/*
* If the session has been REJECTED, then return a hard error,
* unless it's a CLEANRECOVER mount, in which case we'll queue
* it to the mdsc queue.
*/
if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
list_add(&req->r_wait, &mdsc->waiting_for_map);
else
err = -EACCES;
goto out_session;
}
if (session->s_state == CEPH_MDS_SESSION_NEW ||
session->s_state == CEPH_MDS_SESSION_CLOSING) {
err = __open_session(mdsc, session);
if (err)
goto out_session;
/* retry the same mds later */
if (random)
req->r_resend_mds = mds;
}
list_add(&req->r_wait, &session->s_waiting);
goto out_session;
}
/* send request */
req->r_resend_mds = -1; /* forget any previous mds hint */
if (req->r_request_started == 0) /* note request start time */
req->r_request_started = jiffies;
err = __send_request(session, req, false);
out_session:
ceph_put_mds_session(session);
finish:
if (err) {
dout("__do_request early error %d\n", err);
req->r_err = err;
complete_request(mdsc, req);
__unregister_request(mdsc, req);
}
return;
}
/*
* called under mdsc->mutex
*/
static void __wake_requests(struct ceph_mds_client *mdsc,
struct list_head *head)
{
struct ceph_mds_request *req;
LIST_HEAD(tmp_list);
list_splice_init(head, &tmp_list);
while (!list_empty(&tmp_list)) {
req = list_entry(tmp_list.next,
struct ceph_mds_request, r_wait);
list_del_init(&req->r_wait);
dout(" wake request %p tid %llu\n", req, req->r_tid);
__do_request(mdsc, req);
}
}
/*
* Wake up threads with requests pending for @mds, so that they can
* resubmit their requests to a possibly different mds.
*/
static void kick_requests(struct ceph_mds_client *mdsc, int mds)
{
struct ceph_mds_request *req;
struct rb_node *p = rb_first(&mdsc->request_tree);
dout("kick_requests mds%d\n", mds);
while (p) {
req = rb_entry(p, struct ceph_mds_request, r_node);
p = rb_next(p);
if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
continue;
if (req->r_attempts > 0)
continue; /* only new requests */
if (req->r_session &&
req->r_session->s_mds == mds) {
dout(" kicking tid %llu\n", req->r_tid);
list_del_init(&req->r_wait);
__do_request(mdsc, req);
}
}
}
int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
struct ceph_mds_request *req)
{
int err = 0;
/* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
if (req->r_inode)
ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
if (req->r_parent) {
struct ceph_inode_info *ci = ceph_inode(req->r_parent);
int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
spin_lock(&ci->i_ceph_lock);
ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
__ceph_touch_fmode(ci, mdsc, fmode);
spin_unlock(&ci->i_ceph_lock);
ihold(req->r_parent);
}
if (req->r_old_dentry_dir)
ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
CEPH_CAP_PIN);
if (req->r_inode) {
err = ceph_wait_on_async_create(req->r_inode);
if (err) {
dout("%s: wait for async create returned: %d\n",
__func__, err);
return err;
}
}
if (!err && req->r_old_inode) {
err = ceph_wait_on_async_create(req->r_old_inode);
if (err) {
dout("%s: wait for async create returned: %d\n",
__func__, err);
return err;
}
}
dout("submit_request on %p for inode %p\n", req, dir);
mutex_lock(&mdsc->mutex);
__register_request(mdsc, req, dir);
__do_request(mdsc, req);
err = req->r_err;
mutex_unlock(&mdsc->mutex);
return err;
}
static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
int err;
/* wait */
dout("do_request waiting\n");
if (!req->r_timeout && req->r_wait_for_completion) {
err = req->r_wait_for_completion(mdsc, req);
} else {
long timeleft = wait_for_completion_killable_timeout(
&req->r_completion,
ceph_timeout_jiffies(req->r_timeout));
if (timeleft > 0)
err = 0;
else if (!timeleft)
err = -ETIMEDOUT; /* timed out */
else
err = timeleft; /* killed */
}
dout("do_request waited, got %d\n", err);
mutex_lock(&mdsc->mutex);
/* only abort if we didn't race with a real reply */
if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
err = le32_to_cpu(req->r_reply_info.head->result);
} else if (err < 0) {
dout("aborted request %lld with %d\n", req->r_tid, err);
/*
* ensure we aren't running concurrently with
* ceph_fill_trace or ceph_readdir_prepopulate, which
* rely on locks (dir mutex) held by our caller.
*/
mutex_lock(&req->r_fill_mutex);
req->r_err = err;
set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
mutex_unlock(&req->r_fill_mutex);
if (req->r_parent &&
(req->r_op & CEPH_MDS_OP_WRITE))
ceph_invalidate_dir_request(req);
} else {
err = req->r_err;
}
mutex_unlock(&mdsc->mutex);
return err;
}
/*
* Synchrously perform an mds request. Take care of all of the
* session setup, forwarding, retry details.
*/
int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
struct inode *dir,
struct ceph_mds_request *req)
{
int err;
dout("do_request on %p\n", req);
/* issue */
err = ceph_mdsc_submit_request(mdsc, dir, req);
if (!err)
err = ceph_mdsc_wait_request(mdsc, req);
dout("do_request %p done, result %d\n", req, err);
return err;
}
/*
* Invalidate dir's completeness, dentry lease state on an aborted MDS
* namespace request.
*/
void ceph_invalidate_dir_request(struct ceph_mds_request *req)
{
struct inode *dir = req->r_parent;
struct inode *old_dir = req->r_old_dentry_dir;
dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
ceph_dir_clear_complete(dir);
if (old_dir)
ceph_dir_clear_complete(old_dir);
if (req->r_dentry)
ceph_invalidate_dentry_lease(req->r_dentry);
if (req->r_old_dentry)
ceph_invalidate_dentry_lease(req->r_old_dentry);
}
/*
* Handle mds reply.
*
* We take the session mutex and parse and process the reply immediately.
* This preserves the logical ordering of replies, capabilities, etc., sent
* by the MDS as they are applied to our local cache.
*/
static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
{
struct ceph_mds_client *mdsc = session->s_mdsc;
struct ceph_mds_request *req;
struct ceph_mds_reply_head *head = msg->front.iov_base;
struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
struct ceph_snap_realm *realm;
u64 tid;
int err, result;
int mds = session->s_mds;
if (msg->front.iov_len < sizeof(*head)) {
pr_err("mdsc_handle_reply got corrupt (short) reply\n");
ceph_msg_dump(msg);
return;
}
/* get request, session */
tid = le64_to_cpu(msg->hdr.tid);
mutex_lock(&mdsc->mutex);
req = lookup_get_request(mdsc, tid);
if (!req) {
dout("handle_reply on unknown tid %llu\n", tid);
mutex_unlock(&mdsc->mutex);
return;
}
dout("handle_reply %p\n", req);
/* correct session? */
if (req->r_session != session) {
pr_err("mdsc_handle_reply got %llu on session mds%d"
" not mds%d\n", tid, session->s_mds,
req->r_session ? req->r_session->s_mds : -1);
mutex_unlock(&mdsc->mutex);
goto out;
}
/* dup? */
if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
(test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
pr_warn("got a dup %s reply on %llu from mds%d\n",
head->safe ? "safe" : "unsafe", tid, mds);
mutex_unlock(&mdsc->mutex);
goto out;
}
if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
pr_warn("got unsafe after safe on %llu from mds%d\n",
tid, mds);
mutex_unlock(&mdsc->mutex);
goto out;
}
result = le32_to_cpu(head->result);
/*
* Handle an ESTALE
* if we're not talking to the authority, send to them
* if the authority has changed while we weren't looking,
* send to new authority
* Otherwise we just have to return an ESTALE
*/
if (result == -ESTALE) {
dout("got ESTALE on request %llu\n", req->r_tid);
req->r_resend_mds = -1;
if (req->r_direct_mode != USE_AUTH_MDS) {
dout("not using auth, setting for that now\n");
req->r_direct_mode = USE_AUTH_MDS;
__do_request(mdsc, req);
mutex_unlock(&mdsc->mutex);
goto out;
} else {
int mds = __choose_mds(mdsc, req, NULL);
if (mds >= 0 && mds != req->r_session->s_mds) {
dout("but auth changed, so resending\n");
__do_request(mdsc, req);
mutex_unlock(&mdsc->mutex);
goto out;
}
}
dout("have to return ESTALE on request %llu\n", req->r_tid);
}
if (head->safe) {
set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
__unregister_request(mdsc, req);
/* last request during umount? */
if (mdsc->stopping && !__get_oldest_req(mdsc))
complete_all(&mdsc->safe_umount_waiters);
if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
/*
* We already handled the unsafe response, now do the
* cleanup. No need to examine the response; the MDS
* doesn't include any result info in the safe
* response. And even if it did, there is nothing
* useful we could do with a revised return value.
*/
dout("got safe reply %llu, mds%d\n", tid, mds);
mutex_unlock(&mdsc->mutex);
goto out;
}
} else {
set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
}
dout("handle_reply tid %lld result %d\n", tid, result);
rinfo = &req->r_reply_info;
if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
err = parse_reply_info(session, msg, rinfo, (u64)-1);
else
err = parse_reply_info(session, msg, rinfo, session->s_con.peer_features);
mutex_unlock(&mdsc->mutex);
/* Must find target inode outside of mutexes to avoid deadlocks */
if ((err >= 0) && rinfo->head->is_target) {
struct inode *in;
struct ceph_vino tvino = {
.ino = le64_to_cpu(rinfo->targeti.in->ino),
.snap = le64_to_cpu(rinfo->targeti.in->snapid)
};
in = ceph_get_inode(mdsc->fsc->sb, tvino);
if (IS_ERR(in)) {
err = PTR_ERR(in);
mutex_lock(&session->s_mutex);
goto out_err;
}
req->r_target_inode = in;
}
mutex_lock(&session->s_mutex);
if (err < 0) {
pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
ceph_msg_dump(msg);
goto out_err;
}
/* snap trace */
realm = NULL;
if (rinfo->snapblob_len) {
down_write(&mdsc->snap_rwsem);
ceph_update_snap_trace(mdsc, rinfo->snapblob,
rinfo->snapblob + rinfo->snapblob_len,
le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
&realm);
downgrade_write(&mdsc->snap_rwsem);
} else {
down_read(&mdsc->snap_rwsem);
}
/* insert trace into our cache */
mutex_lock(&req->r_fill_mutex);
current->journal_info = req;
err = ceph_fill_trace(mdsc->fsc->sb, req);
if (err == 0) {
if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
req->r_op == CEPH_MDS_OP_LSSNAP))
ceph_readdir_prepopulate(req, req->r_session);
}
current->journal_info = NULL;
mutex_unlock(&req->r_fill_mutex);
up_read(&mdsc->snap_rwsem);
if (realm)
ceph_put_snap_realm(mdsc, realm);
if (err == 0) {
if (req->r_target_inode &&
test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
struct ceph_inode_info *ci =
ceph_inode(req->r_target_inode);
spin_lock(&ci->i_unsafe_lock);
list_add_tail(&req->r_unsafe_target_item,
&ci->i_unsafe_iops);
spin_unlock(&ci->i_unsafe_lock);
}
ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
}
out_err:
mutex_lock(&mdsc->mutex);
if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
if (err) {
req->r_err = err;
} else {
req->r_reply = ceph_msg_get(msg);
set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
}
} else {
dout("reply arrived after request %lld was aborted\n", tid);
}
mutex_unlock(&mdsc->mutex);
mutex_unlock(&session->s_mutex);
/* kick calling process */
complete_request(mdsc, req);
ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
req->r_end_latency, err);
out:
ceph_mdsc_put_request(req);
return;
}
/*
* handle mds notification that our request has been forwarded.
*/
static void handle_forward(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
struct ceph_msg *msg)
{
struct ceph_mds_request *req;
u64 tid = le64_to_cpu(msg->hdr.tid);
u32 next_mds;
u32 fwd_seq;
int err = -EINVAL;
void *p = msg->front.iov_base;
void *end = p + msg->front.iov_len;
ceph_decode_need(&p, end, 2*sizeof(u32), bad);
next_mds = ceph_decode_32(&p);
fwd_seq = ceph_decode_32(&p);
mutex_lock(&mdsc->mutex);
req = lookup_get_request(mdsc, tid);
if (!req) {
dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
goto out; /* dup reply? */
}
if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
dout("forward tid %llu aborted, unregistering\n", tid);
__unregister_request(mdsc, req);
} else if (fwd_seq <= req->r_num_fwd) {
dout("forward tid %llu to mds%d - old seq %d <= %d\n",
tid, next_mds, req->r_num_fwd, fwd_seq);
} else {
/* resend. forward race not possible; mds would drop */
dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
BUG_ON(req->r_err);
BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
req->r_attempts = 0;
req->r_num_fwd = fwd_seq;
req->r_resend_mds = next_mds;
put_request_session(req);
__do_request(mdsc, req);
}
ceph_mdsc_put_request(req);
out:
mutex_unlock(&mdsc->mutex);
return;
bad:
pr_err("mdsc_handle_forward decode error err=%d\n", err);
}
static int __decode_session_metadata(void **p, void *end,
bool *blocklisted)
{
/* map<string,string> */
u32 n;
bool err_str;
ceph_decode_32_safe(p, end, n, bad);
while (n-- > 0) {
u32 len;
ceph_decode_32_safe(p, end, len, bad);
ceph_decode_need(p, end, len, bad);
err_str = !strncmp(*p, "error_string", len);
*p += len;
ceph_decode_32_safe(p, end, len, bad);
ceph_decode_need(p, end, len, bad);
/*
* Match "blocklisted (blacklisted)" from newer MDSes,
* or "blacklisted" from older MDSes.
*/
if (err_str && strnstr(*p, "blacklisted", len))
*blocklisted = true;
*p += len;
}
return 0;
bad:
return -1;
}
/*
* handle a mds session control message
*/
static void handle_session(struct ceph_mds_session *session,
struct ceph_msg *msg)
{
struct ceph_mds_client *mdsc = session->s_mdsc;
int mds = session->s_mds;
int msg_version = le16_to_cpu(msg->hdr.version);
void *p = msg->front.iov_base;
void *end = p + msg->front.iov_len;
struct ceph_mds_session_head *h;
u32 op;
u64 seq, features = 0;
int wake = 0;
bool blocklisted = false;
/* decode */
ceph_decode_need(&p, end, sizeof(*h), bad);
h = p;
p += sizeof(*h);
op = le32_to_cpu(h->op);
seq = le64_to_cpu(h->seq);
if (msg_version >= 3) {
u32 len;
/* version >= 2, metadata */
if (__decode_session_metadata(&p, end, &blocklisted) < 0)
goto bad;
/* version >= 3, feature bits */
ceph_decode_32_safe(&p, end, len, bad);
if (len) {
ceph_decode_64_safe(&p, end, features, bad);
p += len - sizeof(features);
}
}
mutex_lock(&mdsc->mutex);
if (op == CEPH_SESSION_CLOSE) {
ceph_get_mds_session(session);
__unregister_session(mdsc, session);
}
/* FIXME: this ttl calculation is generous */
session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
mutex_unlock(&mdsc->mutex);
mutex_lock(&session->s_mutex);
dout("handle_session mds%d %s %p state %s seq %llu\n",
mds, ceph_session_op_name(op), session,
ceph_session_state_name(session->s_state), seq);
if (session->s_state == CEPH_MDS_SESSION_HUNG) {
session->s_state = CEPH_MDS_SESSION_OPEN;
pr_info("mds%d came back\n", session->s_mds);
}
switch (op) {
case CEPH_SESSION_OPEN:
if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
pr_info("mds%d reconnect success\n", session->s_mds);
session->s_state = CEPH_MDS_SESSION_OPEN;
session->s_features = features;
renewed_caps(mdsc, session, 0);
if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT, &session->s_features))
metric_schedule_delayed(&mdsc->metric);
wake = 1;
if (mdsc->stopping)
__close_session(mdsc, session);
break;
case CEPH_SESSION_RENEWCAPS:
if (session->s_renew_seq == seq)
renewed_caps(mdsc, session, 1);
break;
case CEPH_SESSION_CLOSE:
if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
pr_info("mds%d reconnect denied\n", session->s_mds);
session->s_state = CEPH_MDS_SESSION_CLOSED;
cleanup_session_requests(mdsc, session);
remove_session_caps(session);
wake = 2; /* for good measure */
wake_up_all(&mdsc->session_close_wq);
break;
case CEPH_SESSION_STALE:
pr_info("mds%d caps went stale, renewing\n",
session->s_mds);
spin_lock(&session->s_gen_ttl_lock);
session->s_cap_gen++;
session->s_cap_ttl = jiffies - 1;
spin_unlock(&session->s_gen_ttl_lock);
send_renew_caps(mdsc, session);
break;
case CEPH_SESSION_RECALL_STATE:
ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
break;
case CEPH_SESSION_FLUSHMSG:
send_flushmsg_ack(mdsc, session, seq);
break;
case CEPH_SESSION_FORCE_RO:
dout("force_session_readonly %p\n", session);
spin_lock(&session->s_cap_lock);
session->s_readonly = true;
spin_unlock(&session->s_cap_lock);
wake_up_session_caps(session, FORCE_RO);
break;
case CEPH_SESSION_REJECT:
WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
pr_info("mds%d rejected session\n", session->s_mds);
session->s_state = CEPH_MDS_SESSION_REJECTED;
cleanup_session_requests(mdsc, session);
remove_session_caps(session);
if (blocklisted)
mdsc->fsc->blocklisted = true;
wake = 2; /* for good measure */
break;
default:
pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
WARN_ON(1);
}
mutex_unlock(&session->s_mutex);
if (wake) {
mutex_lock(&mdsc->mutex);
__wake_requests(mdsc, &session->s_waiting);
if (wake == 2)
kick_requests(mdsc, mds);
mutex_unlock(&mdsc->mutex);
}
if (op == CEPH_SESSION_CLOSE)
ceph_put_mds_session(session);
return;
bad:
pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
(int)msg->front.iov_len);
ceph_msg_dump(msg);
return;
}
void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
{
int dcaps;
dcaps = xchg(&req->r_dir_caps, 0);
if (dcaps) {
dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
}
}
void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req)
{
int dcaps;
dcaps = xchg(&req->r_dir_caps, 0);
if (dcaps) {
dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
ceph_put_cap_refs_no_check_caps(ceph_inode(req->r_parent),
dcaps);
}
}
/*
* called under session->mutex.
*/
static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_mds_request *req, *nreq;
struct rb_node *p;
dout("replay_unsafe_requests mds%d\n", session->s_mds);
mutex_lock(&mdsc->mutex);
list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
__send_request(session, req, true);
/*
* also re-send old requests when MDS enters reconnect stage. So that MDS
* can process completed request in clientreplay stage.
*/
p = rb_first(&mdsc->request_tree);
while (p) {
req = rb_entry(p, struct ceph_mds_request, r_node);
p = rb_next(p);
if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
continue;
if (req->r_attempts == 0)
continue; /* only old requests */
if (!req->r_session)
continue;
if (req->r_session->s_mds != session->s_mds)
continue;
ceph_mdsc_release_dir_caps_no_check(req);
__send_request(session, req, true);
}
mutex_unlock(&mdsc->mutex);
}
static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
{
struct ceph_msg *reply;
struct ceph_pagelist *_pagelist;
struct page *page;
__le32 *addr;
int err = -ENOMEM;
if (!recon_state->allow_multi)
return -ENOSPC;
/* can't handle message that contains both caps and realm */
BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
/* pre-allocate new pagelist */
_pagelist = ceph_pagelist_alloc(GFP_NOFS);
if (!_pagelist)
return -ENOMEM;
reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
if (!reply)
goto fail_msg;
/* placeholder for nr_caps */
err = ceph_pagelist_encode_32(_pagelist, 0);
if (err < 0)
goto fail;
if (recon_state->nr_caps) {
/* currently encoding caps */
err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
if (err)
goto fail;
} else {
/* placeholder for nr_realms (currently encoding relams) */
err = ceph_pagelist_encode_32(_pagelist, 0);
if (err < 0)
goto fail;
}
err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
if (err)
goto fail;
page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
addr = kmap_atomic(page);
if (recon_state->nr_caps) {
/* currently encoding caps */
*addr = cpu_to_le32(recon_state->nr_caps);
} else {
/* currently encoding relams */
*(addr + 1) = cpu_to_le32(recon_state->nr_realms);
}
kunmap_atomic(addr);
reply->hdr.version = cpu_to_le16(5);
reply->hdr.compat_version = cpu_to_le16(4);
reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
ceph_con_send(&recon_state->session->s_con, reply);
ceph_pagelist_release(recon_state->pagelist);
recon_state->pagelist = _pagelist;
recon_state->nr_caps = 0;
recon_state->nr_realms = 0;
recon_state->msg_version = 5;
return 0;
fail:
ceph_msg_put(reply);
fail_msg:
ceph_pagelist_release(_pagelist);
return err;
}
static struct dentry* d_find_primary(struct inode *inode)
{
struct dentry *alias, *dn = NULL;
if (hlist_empty(&inode->i_dentry))
return NULL;
spin_lock(&inode->i_lock);
if (hlist_empty(&inode->i_dentry))
goto out_unlock;
if (S_ISDIR(inode->i_mode)) {
alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
if (!IS_ROOT(alias))
dn = dget(alias);
goto out_unlock;
}
hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
spin_lock(&alias->d_lock);
if (!d_unhashed(alias) &&
(ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
dn = dget_dlock(alias);
}
spin_unlock(&alias->d_lock);
if (dn)
break;
}
out_unlock:
spin_unlock(&inode->i_lock);
return dn;
}
/*
* Encode information about a cap for a reconnect with the MDS.
*/
static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap,
void *arg)
{
union {
struct ceph_mds_cap_reconnect v2;
struct ceph_mds_cap_reconnect_v1 v1;
} rec;
struct ceph_inode_info *ci = cap->ci;
struct ceph_reconnect_state *recon_state = arg;
struct ceph_pagelist *pagelist = recon_state->pagelist;
struct dentry *dentry;
char *path;
int pathlen, err;
u64 pathbase;
u64 snap_follows;
dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
inode, ceph_vinop(inode), cap, cap->cap_id,
ceph_cap_string(cap->issued));
dentry = d_find_primary(inode);
if (dentry) {
/* set pathbase to parent dir when msg_version >= 2 */
path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase,
recon_state->msg_version >= 2);
dput(dentry);
if (IS_ERR(path)) {
err = PTR_ERR(path);
goto out_err;
}
} else {
path = NULL;
pathlen = 0;
pathbase = 0;
}
spin_lock(&ci->i_ceph_lock);
cap->seq = 0; /* reset cap seq */
cap->issue_seq = 0; /* and issue_seq */
cap->mseq = 0; /* and migrate_seq */
cap->cap_gen = cap->session->s_cap_gen;
/* These are lost when the session goes away */
if (S_ISDIR(inode->i_mode)) {
if (cap->issued & CEPH_CAP_DIR_CREATE) {
ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
}
cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
}
if (recon_state->msg_version >= 2) {
rec.v2.cap_id = cpu_to_le64(cap->cap_id);
rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
rec.v2.issued = cpu_to_le32(cap->issued);
rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
rec.v2.pathbase = cpu_to_le64(pathbase);
rec.v2.flock_len = (__force __le32)
((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
} else {
rec.v1.cap_id = cpu_to_le64(cap->cap_id);
rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
rec.v1.issued = cpu_to_le32(cap->issued);
rec.v1.size = cpu_to_le64(i_size_read(inode));
ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
rec.v1.pathbase = cpu_to_le64(pathbase);
}
if (list_empty(&ci->i_cap_snaps)) {
snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
} else {
struct ceph_cap_snap *capsnap =
list_first_entry(&ci->i_cap_snaps,
struct ceph_cap_snap, ci_item);
snap_follows = capsnap->follows;
}
spin_unlock(&ci->i_ceph_lock);
if (recon_state->msg_version >= 2) {
int num_fcntl_locks, num_flock_locks;
struct ceph_filelock *flocks = NULL;
size_t struct_len, total_len = sizeof(u64);
u8 struct_v = 0;
encode_again:
if (rec.v2.flock_len) {
ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
} else {
num_fcntl_locks = 0;
num_flock_locks = 0;
}
if (num_fcntl_locks + num_flock_locks > 0) {
flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
sizeof(struct ceph_filelock),
GFP_NOFS);
if (!flocks) {
err = -ENOMEM;
goto out_err;
}
err = ceph_encode_locks_to_buffer(inode, flocks,
num_fcntl_locks,
num_flock_locks);
if (err) {
kfree(flocks);
flocks = NULL;
if (err == -ENOSPC)
goto encode_again;
goto out_err;
}
} else {
kfree(flocks);
flocks = NULL;
}
if (recon_state->msg_version >= 3) {
/* version, compat_version and struct_len */
total_len += 2 * sizeof(u8) + sizeof(u32);
struct_v = 2;
}
/*
* number of encoded locks is stable, so copy to pagelist
*/
struct_len = 2 * sizeof(u32) +
(num_fcntl_locks + num_flock_locks) *
sizeof(struct ceph_filelock);
rec.v2.flock_len = cpu_to_le32(struct_len);
struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
if (struct_v >= 2)
struct_len += sizeof(u64); /* snap_follows */
total_len += struct_len;
if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
err = send_reconnect_partial(recon_state);
if (err)
goto out_freeflocks;
pagelist = recon_state->pagelist;
}
err = ceph_pagelist_reserve(pagelist, total_len);
if (err)
goto out_freeflocks;
ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
if (recon_state->msg_version >= 3) {
ceph_pagelist_encode_8(pagelist, struct_v);
ceph_pagelist_encode_8(pagelist, 1);
ceph_pagelist_encode_32(pagelist, struct_len);
}
ceph_pagelist_encode_string(pagelist, path, pathlen);
ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
ceph_locks_to_pagelist(flocks, pagelist,
num_fcntl_locks, num_flock_locks);
if (struct_v >= 2)
ceph_pagelist_encode_64(pagelist, snap_follows);
out_freeflocks:
kfree(flocks);
} else {
err = ceph_pagelist_reserve(pagelist,
sizeof(u64) + sizeof(u32) +
pathlen + sizeof(rec.v1));
if (err)
goto out_err;
ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
ceph_pagelist_encode_string(pagelist, path, pathlen);
ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
}
out_err:
ceph_mdsc_free_path(path, pathlen);
if (!err)
recon_state->nr_caps++;
return err;
}
static int encode_snap_realms(struct ceph_mds_client *mdsc,
struct ceph_reconnect_state *recon_state)
{
struct rb_node *p;
struct ceph_pagelist *pagelist = recon_state->pagelist;
int err = 0;
if (recon_state->msg_version >= 4) {
err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
if (err < 0)
goto fail;
}
/*
* snaprealms. we provide mds with the ino, seq (version), and
* parent for all of our realms. If the mds has any newer info,
* it will tell us.
*/
for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
struct ceph_snap_realm *realm =
rb_entry(p, struct ceph_snap_realm, node);
struct ceph_mds_snaprealm_reconnect sr_rec;
if (recon_state->msg_version >= 4) {
size_t need = sizeof(u8) * 2 + sizeof(u32) +
sizeof(sr_rec);
if (pagelist->length + need > RECONNECT_MAX_SIZE) {
err = send_reconnect_partial(recon_state);
if (err)
goto fail;
pagelist = recon_state->pagelist;
}
err = ceph_pagelist_reserve(pagelist, need);
if (err)
goto fail;
ceph_pagelist_encode_8(pagelist, 1);
ceph_pagelist_encode_8(pagelist, 1);
ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
}
dout(" adding snap realm %llx seq %lld parent %llx\n",
realm->ino, realm->seq, realm->parent_ino);
sr_rec.ino = cpu_to_le64(realm->ino);
sr_rec.seq = cpu_to_le64(realm->seq);
sr_rec.parent = cpu_to_le64(realm->parent_ino);
err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
if (err)
goto fail;
recon_state->nr_realms++;
}
fail:
return err;
}
/*
* If an MDS fails and recovers, clients need to reconnect in order to
* reestablish shared state. This includes all caps issued through
* this session _and_ the snap_realm hierarchy. Because it's not
* clear which snap realms the mds cares about, we send everything we
* know about.. that ensures we'll then get any new info the
* recovering MDS might have.
*
* This is a relatively heavyweight operation, but it's rare.
*/
static void send_mds_reconnect(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_msg *reply;
int mds = session->s_mds;
int err = -ENOMEM;
struct ceph_reconnect_state recon_state = {
.session = session,
};
LIST_HEAD(dispose);
pr_info("mds%d reconnect start\n", mds);
recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
if (!recon_state.pagelist)
goto fail_nopagelist;
reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
if (!reply)
goto fail_nomsg;
xa_destroy(&session->s_delegated_inos);
mutex_lock(&session->s_mutex);
session->s_state = CEPH_MDS_SESSION_RECONNECTING;
session->s_seq = 0;
dout("session %p state %s\n", session,
ceph_session_state_name(session->s_state));
spin_lock(&session->s_gen_ttl_lock);
session->s_cap_gen++;
spin_unlock(&session->s_gen_ttl_lock);
spin_lock(&session->s_cap_lock);
/* don't know if session is readonly */
session->s_readonly = 0;
/*
* notify __ceph_remove_cap() that we are composing cap reconnect.
* If a cap get released before being added to the cap reconnect,
* __ceph_remove_cap() should skip queuing cap release.
*/
session->s_cap_reconnect = 1;
/* drop old cap expires; we're about to reestablish that state */
detach_cap_releases(session, &dispose);
spin_unlock(&session->s_cap_lock);
dispose_cap_releases(mdsc, &dispose);
/* trim unused caps to reduce MDS's cache rejoin time */
if (mdsc->fsc->sb->s_root)
shrink_dcache_parent(mdsc->fsc->sb->s_root);
ceph_con_close(&session->s_con);
ceph_con_open(&session->s_con,
CEPH_ENTITY_TYPE_MDS, mds,
ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
/* replay unsafe requests */
replay_unsafe_requests(mdsc, session);
ceph_early_kick_flushing_caps(mdsc, session);
down_read(&mdsc->snap_rwsem);
/* placeholder for nr_caps */
err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
if (err)
goto fail;
if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
recon_state.msg_version = 3;
recon_state.allow_multi = true;
} else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
recon_state.msg_version = 3;
} else {
recon_state.msg_version = 2;
}
/* trsaverse this session's caps */
err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
spin_lock(&session->s_cap_lock);
session->s_cap_reconnect = 0;
spin_unlock(&session->s_cap_lock);
if (err < 0)
goto fail;
/* check if all realms can be encoded into current message */
if (mdsc->num_snap_realms) {
size_t total_len =
recon_state.pagelist->length +
mdsc->num_snap_realms *
sizeof(struct ceph_mds_snaprealm_reconnect);
if (recon_state.msg_version >= 4) {
/* number of realms */
total_len += sizeof(u32);
/* version, compat_version and struct_len */
total_len += mdsc->num_snap_realms *
(2 * sizeof(u8) + sizeof(u32));
}
if (total_len > RECONNECT_MAX_SIZE) {
if (!recon_state.allow_multi) {
err = -ENOSPC;
goto fail;
}
if (recon_state.nr_caps) {
err = send_reconnect_partial(&recon_state);
if (err)
goto fail;
}
recon_state.msg_version = 5;
}
}
err = encode_snap_realms(mdsc, &recon_state);
if (err < 0)
goto fail;
if (recon_state.msg_version >= 5) {
err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
if (err < 0)
goto fail;
}
if (recon_state.nr_caps || recon_state.nr_realms) {
struct page *page =
list_first_entry(&recon_state.pagelist->head,
struct page, lru);
__le32 *addr = kmap_atomic(page);
if (recon_state.nr_caps) {
WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
*addr = cpu_to_le32(recon_state.nr_caps);
} else if (recon_state.msg_version >= 4) {
*(addr + 1) = cpu_to_le32(recon_state.nr_realms);
}
kunmap_atomic(addr);
}
reply->hdr.version = cpu_to_le16(recon_state.msg_version);
if (recon_state.msg_version >= 4)
reply->hdr.compat_version = cpu_to_le16(4);
reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
ceph_con_send(&session->s_con, reply);
mutex_unlock(&session->s_mutex);
mutex_lock(&mdsc->mutex);
__wake_requests(mdsc, &session->s_waiting);
mutex_unlock(&mdsc->mutex);
up_read(&mdsc->snap_rwsem);
ceph_pagelist_release(recon_state.pagelist);
return;
fail:
ceph_msg_put(reply);
up_read(&mdsc->snap_rwsem);
mutex_unlock(&session->s_mutex);
fail_nomsg:
ceph_pagelist_release(recon_state.pagelist);
fail_nopagelist:
pr_err("error %d preparing reconnect for mds%d\n", err, mds);
return;
}
/*
* compare old and new mdsmaps, kicking requests
* and closing out old connections as necessary
*
* called under mdsc->mutex.
*/
static void check_new_map(struct ceph_mds_client *mdsc,
struct ceph_mdsmap *newmap,
struct ceph_mdsmap *oldmap)
{
int i;
int oldstate, newstate;
struct ceph_mds_session *s;
dout("check_new_map new %u old %u\n",
newmap->m_epoch, oldmap->m_epoch);
for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
if (!mdsc->sessions[i])
continue;
s = mdsc->sessions[i];
oldstate = ceph_mdsmap_get_state(oldmap, i);
newstate = ceph_mdsmap_get_state(newmap, i);
dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
i, ceph_mds_state_name(oldstate),
ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
ceph_mds_state_name(newstate),
ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
ceph_session_state_name(s->s_state));
if (i >= newmap->possible_max_rank) {
/* force close session for stopped mds */
ceph_get_mds_session(s);
__unregister_session(mdsc, s);
__wake_requests(mdsc, &s->s_waiting);
mutex_unlock(&mdsc->mutex);
mutex_lock(&s->s_mutex);
cleanup_session_requests(mdsc, s);
remove_session_caps(s);
mutex_unlock(&s->s_mutex);
ceph_put_mds_session(s);
mutex_lock(&mdsc->mutex);
kick_requests(mdsc, i);
continue;
}
if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
ceph_mdsmap_get_addr(newmap, i),
sizeof(struct ceph_entity_addr))) {
/* just close it */
mutex_unlock(&mdsc->mutex);
mutex_lock(&s->s_mutex);
mutex_lock(&mdsc->mutex);
ceph_con_close(&s->s_con);
mutex_unlock(&s->s_mutex);
s->s_state = CEPH_MDS_SESSION_RESTARTING;
} else if (oldstate == newstate) {
continue; /* nothing new with this mds */
}
/*
* send reconnect?
*/
if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
newstate >= CEPH_MDS_STATE_RECONNECT) {
mutex_unlock(&mdsc->mutex);
send_mds_reconnect(mdsc, s);
mutex_lock(&mdsc->mutex);
}
/*
* kick request on any mds that has gone active.
*/
if (oldstate < CEPH_MDS_STATE_ACTIVE &&
newstate >= CEPH_MDS_STATE_ACTIVE) {
if (oldstate != CEPH_MDS_STATE_CREATING &&
oldstate != CEPH_MDS_STATE_STARTING)
pr_info("mds%d recovery completed\n", s->s_mds);
kick_requests(mdsc, i);
mutex_unlock(&mdsc->mutex);
mutex_lock(&s->s_mutex);
mutex_lock(&mdsc->mutex);
ceph_kick_flushing_caps(mdsc, s);
mutex_unlock(&s->s_mutex);
wake_up_session_caps(s, RECONNECT);
}
}
for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
s = mdsc->sessions[i];
if (!s)
continue;
if (!ceph_mdsmap_is_laggy(newmap, i))
continue;
if (s->s_state == CEPH_MDS_SESSION_OPEN ||
s->s_state == CEPH_MDS_SESSION_HUNG ||
s->s_state == CEPH_MDS_SESSION_CLOSING) {
dout(" connecting to export targets of laggy mds%d\n",
i);
__open_export_target_sessions(mdsc, s);
}
}
}
/*
* leases
*/
/*
* caller must hold session s_mutex, dentry->d_lock
*/
void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
{
struct ceph_dentry_info *di = ceph_dentry(dentry);
ceph_put_mds_session(di->lease_session);
di->lease_session = NULL;
}
static void handle_lease(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
struct ceph_msg *msg)
{
struct super_block *sb = mdsc->fsc->sb;
struct inode *inode;
struct dentry *parent, *dentry;
struct ceph_dentry_info *di;
int mds = session->s_mds;
struct ceph_mds_lease *h = msg->front.iov_base;
u32 seq;
struct ceph_vino vino;
struct qstr dname;
int release = 0;
dout("handle_lease from mds%d\n", mds);
/* decode */
if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
goto bad;
vino.ino = le64_to_cpu(h->ino);
vino.snap = CEPH_NOSNAP;
seq = le32_to_cpu(h->seq);
dname.len = get_unaligned_le32(h + 1);
if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
goto bad;
dname.name = (void *)(h + 1) + sizeof(u32);
/* lookup inode */
inode = ceph_find_inode(sb, vino);
dout("handle_lease %s, ino %llx %p %.*s\n",
ceph_lease_op_name(h->action), vino.ino, inode,
dname.len, dname.name);
mutex_lock(&session->s_mutex);
inc_session_sequence(session);
if (!inode) {
dout("handle_lease no inode %llx\n", vino.ino);
goto release;
}
/* dentry */
parent = d_find_alias(inode);
if (!parent) {
dout("no parent dentry on inode %p\n", inode);
WARN_ON(1);
goto release; /* hrm... */
}
dname.hash = full_name_hash(parent, dname.name, dname.len);
dentry = d_lookup(parent, &dname);
dput(parent);
if (!dentry)
goto release;
spin_lock(&dentry->d_lock);
di = ceph_dentry(dentry);
switch (h->action) {
case CEPH_MDS_LEASE_REVOKE:
if (di->lease_session == session) {
if (ceph_seq_cmp(di->lease_seq, seq) > 0)
h->seq = cpu_to_le32(di->lease_seq);
__ceph_mdsc_drop_dentry_lease(dentry);
}
release = 1;
break;
case CEPH_MDS_LEASE_RENEW:
if (di->lease_session == session &&
di->lease_gen == session->s_cap_gen &&
di->lease_renew_from &&
di->lease_renew_after == 0) {
unsigned long duration =
msecs_to_jiffies(le32_to_cpu(h->duration_ms));
di->lease_seq = seq;
di->time = di->lease_renew_from + duration;
di->lease_renew_after = di->lease_renew_from +
(duration >> 1);
di->lease_renew_from = 0;
}
break;
}
spin_unlock(&dentry->d_lock);
dput(dentry);
if (!release)
goto out;
release:
/* let's just reuse the same message */
h->action = CEPH_MDS_LEASE_REVOKE_ACK;
ceph_msg_get(msg);
ceph_con_send(&session->s_con, msg);
out:
mutex_unlock(&session->s_mutex);
/* avoid calling iput_final() in mds dispatch threads */
ceph_async_iput(inode);
return;
bad:
pr_err("corrupt lease message\n");
ceph_msg_dump(msg);
}
void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
struct dentry *dentry, char action,
u32 seq)
{
struct ceph_msg *msg;
struct ceph_mds_lease *lease;
struct inode *dir;
int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
dout("lease_send_msg identry %p %s to mds%d\n",
dentry, ceph_lease_op_name(action), session->s_mds);
msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
if (!msg)
return;
lease = msg->front.iov_base;
lease->action = action;
lease->seq = cpu_to_le32(seq);
spin_lock(&dentry->d_lock);
dir = d_inode(dentry->d_parent);
lease->ino = cpu_to_le64(ceph_ino(dir));
lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
put_unaligned_le32(dentry->d_name.len, lease + 1);
memcpy((void *)(lease + 1) + 4,
dentry->d_name.name, dentry->d_name.len);
spin_unlock(&dentry->d_lock);
/*
* if this is a preemptive lease RELEASE, no need to
* flush request stream, since the actual request will
* soon follow.
*/
msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
ceph_con_send(&session->s_con, msg);
}
/*
* lock unlock sessions, to wait ongoing session activities
*/
static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
{
int i;
mutex_lock(&mdsc->mutex);
for (i = 0; i < mdsc->max_sessions; i++) {
struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
if (!s)
continue;
mutex_unlock(&mdsc->mutex);
mutex_lock(&s->s_mutex);
mutex_unlock(&s->s_mutex);
ceph_put_mds_session(s);
mutex_lock(&mdsc->mutex);
}
mutex_unlock(&mdsc->mutex);
}
static void maybe_recover_session(struct ceph_mds_client *mdsc)
{
struct ceph_fs_client *fsc = mdsc->fsc;
if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
return;
if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
return;
if (!READ_ONCE(fsc->blocklisted))
return;
pr_info("auto reconnect after blocklisted\n");
ceph_force_reconnect(fsc->sb);
}
bool check_session_state(struct ceph_mds_session *s)
{
switch (s->s_state) {
case CEPH_MDS_SESSION_OPEN:
if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
s->s_state = CEPH_MDS_SESSION_HUNG;
pr_info("mds%d hung\n", s->s_mds);
}
break;
case CEPH_MDS_SESSION_CLOSING:
/* Should never reach this when we're unmounting */
WARN_ON_ONCE(true);
fallthrough;
case CEPH_MDS_SESSION_NEW:
case CEPH_MDS_SESSION_RESTARTING:
case CEPH_MDS_SESSION_CLOSED:
case CEPH_MDS_SESSION_REJECTED:
return false;
}
return true;
}
/*
* If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
* then we need to retransmit that request.
*/
void inc_session_sequence(struct ceph_mds_session *s)
{
lockdep_assert_held(&s->s_mutex);
s->s_seq++;
if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
int ret;
dout("resending session close request for mds%d\n", s->s_mds);
ret = request_close_session(s);
if (ret < 0)
pr_err("unable to close session to mds%d: %d\n",
s->s_mds, ret);
}
}
/*
* delayed work -- periodically trim expired leases, renew caps with mds
*/
static void schedule_delayed(struct ceph_mds_client *mdsc)
{
int delay = 5;
unsigned hz = round_jiffies_relative(HZ * delay);
schedule_delayed_work(&mdsc->delayed_work, hz);
}
static void delayed_work(struct work_struct *work)
{
int i;
struct ceph_mds_client *mdsc =
container_of(work, struct ceph_mds_client, delayed_work.work);
int renew_interval;
int renew_caps;
dout("mdsc delayed_work\n");
if (mdsc->stopping)
return;
mutex_lock(&mdsc->mutex);
renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
renew_caps = time_after_eq(jiffies, HZ*renew_interval +
mdsc->last_renew_caps);
if (renew_caps)
mdsc->last_renew_caps = jiffies;
for (i = 0; i < mdsc->max_sessions; i++) {
struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
if (!s)
continue;
if (!check_session_state(s)) {
ceph_put_mds_session(s);
continue;
}
mutex_unlock(&mdsc->mutex);
mutex_lock(&s->s_mutex);
if (renew_caps)
send_renew_caps(mdsc, s);
else
ceph_con_keepalive(&s->s_con);
if (s->s_state == CEPH_MDS_SESSION_OPEN ||
s->s_state == CEPH_MDS_SESSION_HUNG)
ceph_send_cap_releases(mdsc, s);
mutex_unlock(&s->s_mutex);
ceph_put_mds_session(s);
mutex_lock(&mdsc->mutex);
}
mutex_unlock(&mdsc->mutex);
ceph_check_delayed_caps(mdsc);
ceph_queue_cap_reclaim_work(mdsc);
ceph_trim_snapid_map(mdsc);
maybe_recover_session(mdsc);
schedule_delayed(mdsc);
}
int ceph_mdsc_init(struct ceph_fs_client *fsc)
{
struct ceph_mds_client *mdsc;
int err;
mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
if (!mdsc)
return -ENOMEM;
mdsc->fsc = fsc;
mutex_init(&mdsc->mutex);
mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
if (!mdsc->mdsmap) {
err = -ENOMEM;
goto err_mdsc;
}
init_completion(&mdsc->safe_umount_waiters);
init_waitqueue_head(&mdsc->session_close_wq);
INIT_LIST_HEAD(&mdsc->waiting_for_map);
mdsc->sessions = NULL;
atomic_set(&mdsc->num_sessions, 0);
mdsc->max_sessions = 0;
mdsc->stopping = 0;
atomic64_set(&mdsc->quotarealms_count, 0);
mdsc->quotarealms_inodes = RB_ROOT;
mutex_init(&mdsc->quotarealms_inodes_mutex);
mdsc->last_snap_seq = 0;
init_rwsem(&mdsc->snap_rwsem);
mdsc->snap_realms = RB_ROOT;
INIT_LIST_HEAD(&mdsc->snap_empty);
mdsc->num_snap_realms = 0;
spin_lock_init(&mdsc->snap_empty_lock);
mdsc->last_tid = 0;
mdsc->oldest_tid = 0;
mdsc->request_tree = RB_ROOT;
INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
mdsc->last_renew_caps = jiffies;
INIT_LIST_HEAD(&mdsc->cap_delay_list);
INIT_LIST_HEAD(&mdsc->cap_wait_list);
spin_lock_init(&mdsc->cap_delay_lock);
INIT_LIST_HEAD(&mdsc->snap_flush_list);
spin_lock_init(&mdsc->snap_flush_lock);
mdsc->last_cap_flush_tid = 1;
INIT_LIST_HEAD(&mdsc->cap_flush_list);
INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
mdsc->num_cap_flushing = 0;
spin_lock_init(&mdsc->cap_dirty_lock);
init_waitqueue_head(&mdsc->cap_flushing_wq);
INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
atomic_set(&mdsc->cap_reclaim_pending, 0);
err = ceph_metric_init(&mdsc->metric);
if (err)
goto err_mdsmap;
spin_lock_init(&mdsc->dentry_list_lock);
INIT_LIST_HEAD(&mdsc->dentry_leases);
INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
ceph_caps_init(mdsc);
ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
spin_lock_init(&mdsc->snapid_map_lock);
mdsc->snapid_map_tree = RB_ROOT;
INIT_LIST_HEAD(&mdsc->snapid_map_lru);
init_rwsem(&mdsc->pool_perm_rwsem);
mdsc->pool_perm_tree = RB_ROOT;
strscpy(mdsc->nodename, utsname()->nodename,
sizeof(mdsc->nodename));
fsc->mdsc = mdsc;
return 0;
err_mdsmap:
kfree(mdsc->mdsmap);
err_mdsc:
kfree(mdsc);
return err;
}
/*
* Wait for safe replies on open mds requests. If we time out, drop
* all requests from the tree to avoid dangling dentry refs.
*/
static void wait_requests(struct ceph_mds_client *mdsc)
{
struct ceph_options *opts = mdsc->fsc->client->options;
struct ceph_mds_request *req;
mutex_lock(&mdsc->mutex);
if (__get_oldest_req(mdsc)) {
mutex_unlock(&mdsc->mutex);
dout("wait_requests waiting for requests\n");
wait_for_completion_timeout(&mdsc->safe_umount_waiters,
ceph_timeout_jiffies(opts->mount_timeout));
/* tear down remaining requests */
mutex_lock(&mdsc->mutex);
while ((req = __get_oldest_req(mdsc))) {
dout("wait_requests timed out on tid %llu\n",
req->r_tid);
list_del_init(&req->r_wait);
__unregister_request(mdsc, req);
}
}
mutex_unlock(&mdsc->mutex);
dout("wait_requests done\n");
}
/*
* called before mount is ro, and before dentries are torn down.
* (hmm, does this still race with new lookups?)
*/
void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
{
dout("pre_umount\n");
mdsc->stopping = 1;
lock_unlock_sessions(mdsc);
ceph_flush_dirty_caps(mdsc);
wait_requests(mdsc);
/*
* wait for reply handlers to drop their request refs and
* their inode/dcache refs
*/
ceph_msgr_flush();
ceph_cleanup_quotarealms_inodes(mdsc);
}
/*
* wait for all write mds requests to flush.
*/
static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
{
struct ceph_mds_request *req = NULL, *nextreq;
struct rb_node *n;
mutex_lock(&mdsc->mutex);
dout("wait_unsafe_requests want %lld\n", want_tid);
restart:
req = __get_oldest_req(mdsc);
while (req && req->r_tid <= want_tid) {
/* find next request */
n = rb_next(&req->r_node);
if (n)
nextreq = rb_entry(n, struct ceph_mds_request, r_node);
else
nextreq = NULL;
if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
(req->r_op & CEPH_MDS_OP_WRITE)) {
/* write op */
ceph_mdsc_get_request(req);
if (nextreq)
ceph_mdsc_get_request(nextreq);
mutex_unlock(&mdsc->mutex);
dout("wait_unsafe_requests wait on %llu (want %llu)\n",
req->r_tid, want_tid);
wait_for_completion(&req->r_safe_completion);
mutex_lock(&mdsc->mutex);
ceph_mdsc_put_request(req);
if (!nextreq)
break; /* next dne before, so we're done! */
if (RB_EMPTY_NODE(&nextreq->r_node)) {
/* next request was removed from tree */
ceph_mdsc_put_request(nextreq);
goto restart;
}
ceph_mdsc_put_request(nextreq); /* won't go away */
}
req = nextreq;
}
mutex_unlock(&mdsc->mutex);
dout("wait_unsafe_requests done\n");
}
void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
{
u64 want_tid, want_flush;
if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
return;
dout("sync\n");
mutex_lock(&mdsc->mutex);
want_tid = mdsc->last_tid;
mutex_unlock(&mdsc->mutex);
ceph_flush_dirty_caps(mdsc);
spin_lock(&mdsc->cap_dirty_lock);
want_flush = mdsc->last_cap_flush_tid;
if (!list_empty(&mdsc->cap_flush_list)) {
struct ceph_cap_flush *cf =
list_last_entry(&mdsc->cap_flush_list,
struct ceph_cap_flush, g_list);
cf->wake = true;
}
spin_unlock(&mdsc->cap_dirty_lock);
dout("sync want tid %lld flush_seq %lld\n",
want_tid, want_flush);
wait_unsafe_requests(mdsc, want_tid);
wait_caps_flush(mdsc, want_flush);
}
/*
* true if all sessions are closed, or we force unmount
*/
static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
{
if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
return true;
return atomic_read(&mdsc->num_sessions) <= skipped;
}
/*
* called after sb is ro.
*/
void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
{
struct ceph_options *opts = mdsc->fsc->client->options;
struct ceph_mds_session *session;
int i;
int skipped = 0;
dout("close_sessions\n");
/* close sessions */
mutex_lock(&mdsc->mutex);
for (i = 0; i < mdsc->max_sessions; i++) {
session = __ceph_lookup_mds_session(mdsc, i);
if (!session)
continue;
mutex_unlock(&mdsc->mutex);
mutex_lock(&session->s_mutex);
if (__close_session(mdsc, session) <= 0)
skipped++;
mutex_unlock(&session->s_mutex);
ceph_put_mds_session(session);
mutex_lock(&mdsc->mutex);
}
mutex_unlock(&mdsc->mutex);
dout("waiting for sessions to close\n");
wait_event_timeout(mdsc->session_close_wq,
done_closing_sessions(mdsc, skipped),
ceph_timeout_jiffies(opts->mount_timeout));
/* tear down remaining sessions */
mutex_lock(&mdsc->mutex);
for (i = 0; i < mdsc->max_sessions; i++) {
if (mdsc->sessions[i]) {
session = ceph_get_mds_session(mdsc->sessions[i]);
__unregister_session(mdsc, session);
mutex_unlock(&mdsc->mutex);
mutex_lock(&session->s_mutex);
remove_session_caps(session);
mutex_unlock(&session->s_mutex);
ceph_put_mds_session(session);
mutex_lock(&mdsc->mutex);
}
}
WARN_ON(!list_empty(&mdsc->cap_delay_list));
mutex_unlock(&mdsc->mutex);
ceph_cleanup_snapid_map(mdsc);
ceph_cleanup_empty_realms(mdsc);
cancel_work_sync(&mdsc->cap_reclaim_work);
cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
dout("stopped\n");
}
void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
{
struct ceph_mds_session *session;
int mds;
dout("force umount\n");
mutex_lock(&mdsc->mutex);
for (mds = 0; mds < mdsc->max_sessions; mds++) {
session = __ceph_lookup_mds_session(mdsc, mds);
if (!session)
continue;
if (session->s_state == CEPH_MDS_SESSION_REJECTED)
__unregister_session(mdsc, session);
__wake_requests(mdsc, &session->s_waiting);
mutex_unlock(&mdsc->mutex);
mutex_lock(&session->s_mutex);
__close_session(mdsc, session);
if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
cleanup_session_requests(mdsc, session);
remove_session_caps(session);
}
mutex_unlock(&session->s_mutex);
ceph_put_mds_session(session);
mutex_lock(&mdsc->mutex);
kick_requests(mdsc, mds);
}
__wake_requests(mdsc, &mdsc->waiting_for_map);
mutex_unlock(&mdsc->mutex);
}
static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
{
dout("stop\n");
/*
* Make sure the delayed work stopped before releasing
* the resources.
*
* Because the cancel_delayed_work_sync() will only
* guarantee that the work finishes executing. But the
* delayed work will re-arm itself again after that.
*/
flush_delayed_work(&mdsc->delayed_work);
if (mdsc->mdsmap)
ceph_mdsmap_destroy(mdsc->mdsmap);
kfree(mdsc->sessions);
ceph_caps_finalize(mdsc);
ceph_pool_perm_destroy(mdsc);
}
void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
{
struct ceph_mds_client *mdsc = fsc->mdsc;
dout("mdsc_destroy %p\n", mdsc);
if (!mdsc)
return;
/* flush out any connection work with references to us */
ceph_msgr_flush();
ceph_mdsc_stop(mdsc);
ceph_metric_destroy(&mdsc->metric);
flush_delayed_work(&mdsc->metric.delayed_work);
fsc->mdsc = NULL;
kfree(mdsc);
dout("mdsc_destroy %p done\n", mdsc);
}
void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
{
struct ceph_fs_client *fsc = mdsc->fsc;
const char *mds_namespace = fsc->mount_options->mds_namespace;
void *p = msg->front.iov_base;
void *end = p + msg->front.iov_len;
u32 epoch;
u32 num_fs;
u32 mount_fscid = (u32)-1;
int err = -EINVAL;
ceph_decode_need(&p, end, sizeof(u32), bad);
epoch = ceph_decode_32(&p);
dout("handle_fsmap epoch %u\n", epoch);
/* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
ceph_decode_32_safe(&p, end, num_fs, bad);
while (num_fs-- > 0) {
void *info_p, *info_end;
u32 info_len;
u32 fscid, namelen;
ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
p += 2; // info_v, info_cv
info_len = ceph_decode_32(&p);
ceph_decode_need(&p, end, info_len, bad);
info_p = p;
info_end = p + info_len;
p = info_end;
ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
fscid = ceph_decode_32(&info_p);
namelen = ceph_decode_32(&info_p);
ceph_decode_need(&info_p, info_end, namelen, bad);
if (mds_namespace &&
strlen(mds_namespace) == namelen &&
!strncmp(mds_namespace, (char *)info_p, namelen)) {
mount_fscid = fscid;
break;
}
}
ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
if (mount_fscid != (u32)-1) {
fsc->client->monc.fs_cluster_id = mount_fscid;
ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
0, true);
ceph_monc_renew_subs(&fsc->client->monc);
} else {
err = -ENOENT;
goto err_out;
}
return;
bad:
pr_err("error decoding fsmap\n");
err_out:
mutex_lock(&mdsc->mutex);
mdsc->mdsmap_err = err;
__wake_requests(mdsc, &mdsc->waiting_for_map);
mutex_unlock(&mdsc->mutex);
}
/*
* handle mds map update.
*/
void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
{
u32 epoch;
u32 maplen;
void *p = msg->front.iov_base;
void *end = p + msg->front.iov_len;
struct ceph_mdsmap *newmap, *oldmap;
struct ceph_fsid fsid;
int err = -EINVAL;
ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
ceph_decode_copy(&p, &fsid, sizeof(fsid));
if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
return;
epoch = ceph_decode_32(&p);
maplen = ceph_decode_32(&p);
dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
/* do we need it? */
mutex_lock(&mdsc->mutex);
if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
dout("handle_map epoch %u <= our %u\n",
epoch, mdsc->mdsmap->m_epoch);
mutex_unlock(&mdsc->mutex);
return;
}
newmap = ceph_mdsmap_decode(&p, end, ceph_msgr2(mdsc->fsc->client));
if (IS_ERR(newmap)) {
err = PTR_ERR(newmap);
goto bad_unlock;
}
/* swap into place */
if (mdsc->mdsmap) {
oldmap = mdsc->mdsmap;
mdsc->mdsmap = newmap;
check_new_map(mdsc, newmap, oldmap);
ceph_mdsmap_destroy(oldmap);
} else {
mdsc->mdsmap = newmap; /* first mds map */
}
mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
MAX_LFS_FILESIZE);
__wake_requests(mdsc, &mdsc->waiting_for_map);
ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
mdsc->mdsmap->m_epoch);
mutex_unlock(&mdsc->mutex);
schedule_delayed(mdsc);
return;
bad_unlock:
mutex_unlock(&mdsc->mutex);
bad:
pr_err("error decoding mdsmap %d\n", err);
return;
}
static struct ceph_connection *mds_get_con(struct ceph_connection *con)
{
struct ceph_mds_session *s = con->private;
if (ceph_get_mds_session(s))
return con;
return NULL;
}
static void mds_put_con(struct ceph_connection *con)
{
struct ceph_mds_session *s = con->private;
ceph_put_mds_session(s);
}
/*
* if the client is unresponsive for long enough, the mds will kill
* the session entirely.
*/
static void mds_peer_reset(struct ceph_connection *con)
{
struct ceph_mds_session *s = con->private;
struct ceph_mds_client *mdsc = s->s_mdsc;
pr_warn("mds%d closed our session\n", s->s_mds);
send_mds_reconnect(mdsc, s);
}
static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
struct ceph_mds_session *s = con->private;
struct ceph_mds_client *mdsc = s->s_mdsc;
int type = le16_to_cpu(msg->hdr.type);
mutex_lock(&mdsc->mutex);
if (__verify_registered_session(mdsc, s) < 0) {
mutex_unlock(&mdsc->mutex);
goto out;
}
mutex_unlock(&mdsc->mutex);
switch (type) {
case CEPH_MSG_MDS_MAP:
ceph_mdsc_handle_mdsmap(mdsc, msg);
break;
case CEPH_MSG_FS_MAP_USER:
ceph_mdsc_handle_fsmap(mdsc, msg);
break;
case CEPH_MSG_CLIENT_SESSION:
handle_session(s, msg);
break;
case CEPH_MSG_CLIENT_REPLY:
handle_reply(s, msg);
break;
case CEPH_MSG_CLIENT_REQUEST_FORWARD:
handle_forward(mdsc, s, msg);
break;
case CEPH_MSG_CLIENT_CAPS:
ceph_handle_caps(s, msg);
break;
case CEPH_MSG_CLIENT_SNAP:
ceph_handle_snap(mdsc, s, msg);
break;
case CEPH_MSG_CLIENT_LEASE:
handle_lease(mdsc, s, msg);
break;
case CEPH_MSG_CLIENT_QUOTA:
ceph_handle_quota(mdsc, s, msg);
break;
default:
pr_err("received unknown message type %d %s\n", type,
ceph_msg_type_name(type));
}
out:
ceph_msg_put(msg);
}
/*
* authentication
*/
/*
* Note: returned pointer is the address of a structure that's
* managed separately. Caller must *not* attempt to free it.
*/
static struct ceph_auth_handshake *
mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
{
struct ceph_mds_session *s = con->private;
struct ceph_mds_client *mdsc = s->s_mdsc;
struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
struct ceph_auth_handshake *auth = &s->s_auth;
int ret;
ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
force_new, proto, NULL, NULL);
if (ret)
return ERR_PTR(ret);
return auth;
}
static int mds_add_authorizer_challenge(struct ceph_connection *con,
void *challenge_buf, int challenge_buf_len)
{
struct ceph_mds_session *s = con->private;
struct ceph_mds_client *mdsc = s->s_mdsc;
struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
challenge_buf, challenge_buf_len);
}
static int mds_verify_authorizer_reply(struct ceph_connection *con)
{
struct ceph_mds_session *s = con->private;
struct ceph_mds_client *mdsc = s->s_mdsc;
struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
struct ceph_auth_handshake *auth = &s->s_auth;
return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
NULL, NULL, NULL, NULL);
}
static int mds_invalidate_authorizer(struct ceph_connection *con)
{
struct ceph_mds_session *s = con->private;
struct ceph_mds_client *mdsc = s->s_mdsc;
struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
}
static int mds_get_auth_request(struct ceph_connection *con,
void *buf, int *buf_len,
void **authorizer, int *authorizer_len)
{
struct ceph_mds_session *s = con->private;
struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
struct ceph_auth_handshake *auth = &s->s_auth;
int ret;
ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
buf, buf_len);
if (ret)
return ret;
*authorizer = auth->authorizer_buf;
*authorizer_len = auth->authorizer_buf_len;
return 0;
}
static int mds_handle_auth_reply_more(struct ceph_connection *con,
void *reply, int reply_len,
void *buf, int *buf_len,
void **authorizer, int *authorizer_len)
{
struct ceph_mds_session *s = con->private;
struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
struct ceph_auth_handshake *auth = &s->s_auth;
int ret;
ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
buf, buf_len);
if (ret)
return ret;
*authorizer = auth->authorizer_buf;
*authorizer_len = auth->authorizer_buf_len;
return 0;
}
static int mds_handle_auth_done(struct ceph_connection *con,
u64 global_id, void *reply, int reply_len,
u8 *session_key, int *session_key_len,
u8 *con_secret, int *con_secret_len)
{
struct ceph_mds_session *s = con->private;
struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
struct ceph_auth_handshake *auth = &s->s_auth;
return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
session_key, session_key_len,
con_secret, con_secret_len);
}
static int mds_handle_auth_bad_method(struct ceph_connection *con,
int used_proto, int result,
const int *allowed_protos, int proto_cnt,
const int *allowed_modes, int mode_cnt)
{
struct ceph_mds_session *s = con->private;
struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
int ret;
if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
used_proto, result,
allowed_protos, proto_cnt,
allowed_modes, mode_cnt)) {
ret = ceph_monc_validate_auth(monc);
if (ret)
return ret;
}
return -EACCES;
}
static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
struct ceph_msg_header *hdr, int *skip)
{
struct ceph_msg *msg;
int type = (int) le16_to_cpu(hdr->type);
int front_len = (int) le32_to_cpu(hdr->front_len);
if (con->in_msg)
return con->in_msg;
*skip = 0;
msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
if (!msg) {
pr_err("unable to allocate msg type %d len %d\n",
type, front_len);
return NULL;
}
return msg;
}
static int mds_sign_message(struct ceph_msg *msg)
{
struct ceph_mds_session *s = msg->con->private;
struct ceph_auth_handshake *auth = &s->s_auth;
return ceph_auth_sign_message(auth, msg);
}
static int mds_check_message_signature(struct ceph_msg *msg)
{
struct ceph_mds_session *s = msg->con->private;
struct ceph_auth_handshake *auth = &s->s_auth;
return ceph_auth_check_message_signature(auth, msg);
}
static const struct ceph_connection_operations mds_con_ops = {
.get = mds_get_con,
.put = mds_put_con,
.alloc_msg = mds_alloc_msg,
.dispatch = mds_dispatch,
.peer_reset = mds_peer_reset,
.get_authorizer = mds_get_authorizer,
.add_authorizer_challenge = mds_add_authorizer_challenge,
.verify_authorizer_reply = mds_verify_authorizer_reply,
.invalidate_authorizer = mds_invalidate_authorizer,
.sign_message = mds_sign_message,
.check_message_signature = mds_check_message_signature,
.get_auth_request = mds_get_auth_request,
.handle_auth_reply_more = mds_handle_auth_reply_more,
.handle_auth_done = mds_handle_auth_done,
.handle_auth_bad_method = mds_handle_auth_bad_method,
};
/* eof */
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