blob: a92d3f5c6c12fa3ae0b7308c9fcd379ac821cc67 [file] [log] [blame]
#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/utsname.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>
/*
* 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* are no longer valid.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 {
int nr_caps;
struct ceph_pagelist *pagelist;
bool flock;
};
static void __wake_requests(struct ceph_mds_client *mdsc,
struct list_head *head);
static const struct ceph_connection_operations mds_con_ops;
/*
* mds reply parsing
*/
/*
* 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 = -EIO;
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;
if (features & CEPH_FEATURE_DIRLAYOUTHASH)
ceph_decode_copy_safe(p, end, &info->dir_layout,
sizeof(info->dir_layout), bad);
else
memset(&info->dir_layout, 0, sizeof(info->dir_layout));
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;
return 0;
bad:
return err;
}
/*
* 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;
if (unlikely(*p + sizeof(*info->dirfrag) > end))
goto bad;
info->dirfrag = *p;
*p += sizeof(*info->dirfrag) +
sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
if (unlikely(*p > end))
goto 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;
info->dlease = *p;
*p += sizeof(*info->dlease);
}
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_dir(void **p, void *end,
struct ceph_mds_reply_info_parsed *info,
u64 features)
{
u32 num, i = 0;
int err;
info->dir_dir = *p;
if (*p + sizeof(*info->dir_dir) > end)
goto bad;
*p += sizeof(*info->dir_dir) +
sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
if (*p > end)
goto bad;
ceph_decode_need(p, end, sizeof(num) + 2, bad);
num = ceph_decode_32(p);
info->dir_end = ceph_decode_8(p);
info->dir_complete = ceph_decode_8(p);
if (num == 0)
goto done;
BUG_ON(!info->dir_in);
info->dir_dname = (void *)(info->dir_in + num);
info->dir_dname_len = (void *)(info->dir_dname + num);
info->dir_dlease = (void *)(info->dir_dname_len + num);
if ((unsigned long)(info->dir_dlease + num) >
(unsigned long)info->dir_in + info->dir_buf_size) {
pr_err("dir contents are larger than expected\n");
WARN_ON(1);
goto bad;
}
info->dir_nr = num;
while (num) {
/* dentry */
ceph_decode_need(p, end, sizeof(u32)*2, bad);
info->dir_dname_len[i] = ceph_decode_32(p);
ceph_decode_need(p, end, info->dir_dname_len[i], bad);
info->dir_dname[i] = *p;
*p += info->dir_dname_len[i];
dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
info->dir_dname[i]);
info->dir_dlease[i] = *p;
*p += sizeof(struct ceph_mds_reply_lease);
/* inode */
err = parse_reply_info_in(p, end, &info->dir_in[i], features);
if (err < 0)
goto out_bad;
i++;
num--;
}
done:
if (*p != end)
goto bad;
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;
*p += sizeof(*info->filelock_reply);
if (unlikely(*p != end))
goto bad;
return 0;
bad:
return -EIO;
}
/*
* parse create results
*/
static int parse_reply_info_create(void **p, void *end,
struct ceph_mds_reply_info_parsed *info,
u64 features)
{
if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
if (*p == end) {
info->has_create_ino = false;
} else {
info->has_create_ino = true;
info->ino = ceph_decode_64(p);
}
}
if (unlikely(*p != end))
goto bad;
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)
{
if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
return parse_reply_info_filelock(p, end, info, features);
else if (info->head->op == CEPH_MDS_OP_READDIR ||
info->head->op == CEPH_MDS_OP_LSSNAP)
return parse_reply_info_dir(p, end, info, features);
else if (info->head->op == CEPH_MDS_OP_CREATE)
return parse_reply_info_create(p, end, info, features);
else
return -EIO;
}
/*
* parse entire mds reply
*/
static int parse_reply_info(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);
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_in)
return;
free_pages((unsigned long)info->dir_in, 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_RESTARTING: return "restarting";
case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
default: return "???";
}
}
static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
{
if (atomic_inc_not_zero(&s->s_ref)) {
dout("mdsc get_session %p %d -> %d\n", s,
atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
return s;
} else {
dout("mdsc get_session %p 0 -- FAIL", s);
return NULL;
}
}
void ceph_put_mds_session(struct ceph_mds_session *s)
{
dout("mdsc put_session %p %d -> %d\n", s,
atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
if (atomic_dec_and_test(&s->s_ref)) {
if (s->s_auth.authorizer)
ceph_auth_destroy_authorizer(
s->s_mdsc->fsc->client->monc.auth,
s->s_auth.authorizer);
kfree(s);
}
}
/*
* called under mdsc->mutex
*/
struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
int mds)
{
struct ceph_mds_session *session;
if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
return NULL;
session = mdsc->sessions[mds];
dout("lookup_mds_session %p %d\n", session,
atomic_read(&session->s_ref));
get_session(session);
return session;
}
static bool __have_session(struct ceph_mds_client *mdsc, int mds)
{
if (mds >= mdsc->max_sessions)
return false;
return mdsc->sessions[mds];
}
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->m_max_mds)
return ERR_PTR(-EINVAL);
s = kzalloc(sizeof(*s), GFP_NOFS);
if (!s)
return ERR_PTR(-ENOMEM);
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 = 0;
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;
s->s_trim_caps = 0;
atomic_set(&s->s_ref, 1);
INIT_LIST_HEAD(&s->s_waiting);
INIT_LIST_HEAD(&s->s_unsafe);
s->s_num_cap_releases = 0;
s->s_cap_reconnect = 0;
s->s_cap_iterator = NULL;
INIT_LIST_HEAD(&s->s_cap_releases);
INIT_LIST_HEAD(&s->s_cap_releases_done);
INIT_LIST_HEAD(&s->s_cap_flushing);
INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
dout("register_session mds%d\n", mds);
if (mds >= mdsc->max_sessions) {
int newmax = 1 << get_count_order(mds+1);
struct ceph_mds_session **sa;
dout("register_session realloc to %d\n", newmax);
sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
if (sa == NULL)
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;
}
mdsc->sessions[mds] = s;
atomic_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);
}
/*
* 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);
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);
iput(req->r_inode);
}
if (req->r_locked_dir)
ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
if (req->r_target_inode)
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);
iput(req->r_old_dentry_dir);
}
kfree(req->r_path1);
kfree(req->r_path2);
if (req->r_pagelist)
ceph_pagelist_release(req->r_pagelist);
put_request_session(req);
ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
kfree(req);
}
/*
* lookup session, bump ref if found.
*
* called under mdsc->mutex.
*/
static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
u64 tid)
{
struct ceph_mds_request *req;
struct rb_node *n = mdsc->request_tree.rb_node;
while (n) {
req = rb_entry(n, struct ceph_mds_request, r_node);
if (tid < req->r_tid)
n = n->rb_left;
else if (tid > req->r_tid)
n = n->rb_right;
else {
ceph_mdsc_get_request(req);
return req;
}
}
return NULL;
}
static void __insert_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *new)
{
struct rb_node **p = &mdsc->request_tree.rb_node;
struct rb_node *parent = NULL;
struct ceph_mds_request *req = NULL;
while (*p) {
parent = *p;
req = rb_entry(parent, struct ceph_mds_request, r_node);
if (new->r_tid < req->r_tid)
p = &(*p)->rb_left;
else if (new->r_tid > req->r_tid)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(&new->r_node, parent, p);
rb_insert_color(&new->r_node, &mdsc->request_tree);
}
/*
* 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)
{
req->r_tid = ++mdsc->last_tid;
if (req->r_num_caps)
ceph_reserve_caps(mdsc, &req->r_caps_reservation,
req->r_num_caps);
dout("__register_request %p tid %lld\n", req, req->r_tid);
ceph_mdsc_get_request(req);
__insert_request(mdsc, req);
req->r_uid = current_fsuid();
req->r_gid = current_fsgid();
if (dir) {
struct ceph_inode_info *ci = ceph_inode(dir);
ihold(dir);
spin_lock(&ci->i_unsafe_lock);
req->r_unsafe_dir = dir;
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);
rb_erase(&req->r_node, &mdsc->request_tree);
RB_CLEAR_NODE(&req->r_node);
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);
iput(req->r_unsafe_dir);
req->r_unsafe_dir = NULL;
}
complete_all(&req->r_safe_completion);
ceph_mdsc_put_request(req);
}
/*
* 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 struct dentry *get_nonsnap_parent(struct dentry *dentry)
{
/*
* we don't need to worry about protecting the d_parent access
* here because we never renaming inside the snapped namespace
* except to resplice to another snapdir, and either the old or new
* result is a valid result.
*/
while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
dentry = dentry->d_parent;
return dentry;
}
static int __choose_mds(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
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 = req->r_direct_is_hash;
/*
* 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("choose_mds using resend_mds mds%d\n",
req->r_resend_mds);
return req->r_resend_mds;
}
if (mode == USE_RANDOM_MDS)
goto random;
inode = NULL;
if (req->r_inode) {
inode = req->r_inode;
} else if (req->r_dentry) {
/* ignore race with rename; old or new d_parent is okay */
struct dentry *parent = req->r_dentry->d_parent;
struct inode *dir = parent->d_inode;
if (dir->i_sb != mdsc->fsc->sb) {
/* not this fs! */
inode = req->r_dentry->d_inode;
} else if (ceph_snap(dir) != CEPH_NOSNAP) {
/* direct snapped/virtual snapdir requests
* based on parent dir inode */
struct dentry *dn = get_nonsnap_parent(parent);
inode = dn->d_inode;
dout("__choose_mds using nonsnap parent %p\n", inode);
} else {
/* dentry target */
inode = req->r_dentry->d_inode;
if (!inode || mode == USE_AUTH_MDS) {
/* dir + name */
inode = dir;
hash = ceph_dentry_hash(dir, req->r_dentry);
is_hash = true;
}
}
}
dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
(int)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("choose_mds %p %llx.%llx "
"frag %u mds%d (%d/%d)\n",
inode, ceph_vinop(inode),
frag.frag, mds,
(int)r, frag.ndist);
if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
CEPH_MDS_STATE_ACTIVE)
return mds;
}
/* since this file/dir wasn't known to be
* replicated, then we want to look for the
* authoritative mds. */
mode = USE_AUTH_MDS;
if (frag.mds >= 0) {
/* choose auth mds */
mds = frag.mds;
dout("choose_mds %p %llx.%llx "
"frag %u mds%d (auth)\n",
inode, ceph_vinop(inode), frag.frag, mds);
if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
CEPH_MDS_STATE_ACTIVE)
return 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);
goto random;
}
mds = cap->session->s_mds;
dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
inode, ceph_vinop(inode), mds,
cap == ci->i_auth_cap ? "auth " : "", cap);
spin_unlock(&ci->i_ceph_lock);
return mds;
random:
mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
dout("choose_mds chose random mds%d\n", 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;
}
/*
* 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 = -1;
int metadata_bytes = 0;
int metadata_key_count = 0;
struct ceph_options *opt = mdsc->fsc->client->options;
void *p;
const char* metadata[3][2] = {
{"hostname", utsname()->nodename},
{"entity_id", opt->name ? opt->name : ""},
{NULL, NULL}
};
/* Calculate serialized length of metadata */
metadata_bytes = 4; /* map length */
for (i = 0; metadata[i][0] != NULL; ++i) {
metadata_bytes += 8 + strlen(metadata[i][0]) +
strlen(metadata[i][1]);
metadata_key_count++;
}
/* Allocate the message */
msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
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(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>
*/
msg->hdr.version = 2; /* ClientSession messages with metadata are v2 */
/* The write pointer, following the session_head structure */
p = msg->front.iov_base + 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] != NULL; ++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;
}
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 (!msg)
return -ENOMEM;
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;
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)
__open_session(mdsc, session);
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->m_max_mds)
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
*/
/*
* Free preallocated cap messages assigned to this session
*/
static void cleanup_cap_releases(struct ceph_mds_session *session)
{
struct ceph_msg *msg;
spin_lock(&session->s_cap_lock);
while (!list_empty(&session->s_cap_releases)) {
msg = list_first_entry(&session->s_cap_releases,
struct ceph_msg, list_head);
list_del_init(&msg->list_head);
ceph_msg_put(msg);
}
while (!list_empty(&session->s_cap_releases_done)) {
msg = list_first_entry(&session->s_cap_releases_done,
struct ceph_msg, list_head);
list_del_init(&msg->list_head);
ceph_msg_put(msg);
}
spin_unlock(&session->s_cap_lock);
}
/*
* 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.
*/
static int 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) {
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 == NULL) {
dout("iterate_session_caps finishing cap %p removal\n",
cap);
BUG_ON(cap->session != session);
list_del_init(&cap->session_caps);
session->s_nr_caps--;
cap->session = NULL;
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);
if (last_inode)
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_inode_info *ci = ceph_inode(inode);
int drop = 0;
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 (!__ceph_is_any_real_caps(ci)) {
struct ceph_mds_client *mdsc =
ceph_sb_to_client(inode->i_sb)->mdsc;
spin_lock(&mdsc->cap_dirty_lock);
if (!list_empty(&ci->i_dirty_item)) {
pr_info(" 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);
drop = 1;
}
if (!list_empty(&ci->i_flushing_item)) {
pr_info(" 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--;
drop = 1;
}
if (drop && ci->i_wrbuffer_ref) {
pr_info(" dropping dirty data for %p %lld\n",
inode, ceph_ino(inode));
ci->i_wrbuffer_ref = 0;
ci->i_wrbuffer_ref_head = 0;
drop++;
}
spin_unlock(&mdsc->cap_dirty_lock);
}
spin_unlock(&ci->i_ceph_lock);
while (drop--)
iput(inode);
return 0;
}
/*
* caller must hold session s_mutex
*/
static void remove_session_caps(struct ceph_mds_session *session)
{
dout("remove_session_caps on %p\n", session);
iterate_session_caps(session, remove_session_caps_cb, NULL);
spin_lock(&session->s_cap_lock);
if (session->s_nr_caps > 0) {
struct super_block *sb = session->s_mdsc->fsc->sb;
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);
iput(inode);
spin_lock(&session->s_cap_lock);
}
}
spin_unlock(&session->s_cap_lock);
BUG_ON(session->s_nr_caps > 0);
BUG_ON(!list_empty(&session->s_cap_flushing));
cleanup_cap_releases(session);
}
/*
* 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);
wake_up_all(&ci->i_cap_wq);
if (arg) {
spin_lock(&ci->i_ceph_lock);
ci->i_wanted_max_size = 0;
ci->i_requested_max_size = 0;
spin_unlock(&ci->i_ceph_lock);
}
return 0;
}
static void wake_up_session_caps(struct ceph_mds_session *session,
int reconnect)
{
dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
iterate_session_caps(session, wake_up_session_cb,
(void *)(unsigned long)reconnect);
}
/*
* 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, 0);
}
/*
* send a session close request
*/
static int request_close_session(struct ceph_mds_client *mdsc,
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 0;
}
/*
* 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(mdsc, session);
}
/*
* 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)
{
struct ceph_mds_session *session = arg;
struct ceph_inode_info *ci = ceph_inode(inode);
int used, wanted, oissued, mine;
if (session->s_trim_caps <= 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)
goto out;
if ((used | wanted) & CEPH_CAP_ANY_WR)
goto out;
}
if ((used | wanted) & ~oissued & mine)
goto out; /* we need these caps */
session->s_trim_caps--;
if (oissued) {
/* we aren't the only cap.. just remove us */
__ceph_remove_cap(cap, true);
} else {
/* try to drop referring dentries */
spin_unlock(&ci->i_ceph_lock);
d_prune_aliases(inode);
dout("trim_caps_cb %p cap %p pruned, count now %d\n",
inode, cap, atomic_read(&inode->i_count));
return 0;
}
out:
spin_unlock(&ci->i_ceph_lock);
return 0;
}
/*
* Trim session cap count down to some max number.
*/
static int 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) {
session->s_trim_caps = trim_caps;
iterate_session_caps(session, trim_caps_cb, session);
dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
session->s_mds, session->s_nr_caps, max_caps,
trim_caps - session->s_trim_caps);
session->s_trim_caps = 0;
}
ceph_add_cap_releases(mdsc, session);
ceph_send_cap_releases(mdsc, session);
return 0;
}
/*
* Allocate cap_release messages. If there is a partially full message
* in the queue, try to allocate enough to cover it's remainder, so that
* we can send it immediately.
*
* Called under s_mutex.
*/
int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_msg *msg, *partial = NULL;
struct ceph_mds_cap_release *head;
int err = -ENOMEM;
int extra = mdsc->fsc->mount_options->cap_release_safety;
int num;
dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
extra);
spin_lock(&session->s_cap_lock);
if (!list_empty(&session->s_cap_releases)) {
msg = list_first_entry(&session->s_cap_releases,
struct ceph_msg,
list_head);
head = msg->front.iov_base;
num = le32_to_cpu(head->num);
if (num) {
dout(" partial %p with (%d/%d)\n", msg, num,
(int)CEPH_CAPS_PER_RELEASE);
extra += CEPH_CAPS_PER_RELEASE - num;
partial = msg;
}
}
while (session->s_num_cap_releases < session->s_nr_caps + extra) {
spin_unlock(&session->s_cap_lock);
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
GFP_NOFS, false);
if (!msg)
goto out_unlocked;
dout("add_cap_releases %p msg %p now %d\n", session, msg,
(int)msg->front.iov_len);
head = msg->front.iov_base;
head->num = cpu_to_le32(0);
msg->front.iov_len = sizeof(*head);
spin_lock(&session->s_cap_lock);
list_add(&msg->list_head, &session->s_cap_releases);
session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
}
if (partial) {
head = partial->front.iov_base;
num = le32_to_cpu(head->num);
dout(" queueing partial %p with %d/%d\n", partial, num,
(int)CEPH_CAPS_PER_RELEASE);
list_move_tail(&partial->list_head,
&session->s_cap_releases_done);
session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
}
err = 0;
spin_unlock(&session->s_cap_lock);
out_unlocked:
return err;
}
/*
* flush all dirty inode data to disk.
*
* returns true if we've flushed through want_flush_seq
*/
static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
{
int mds, ret = 1;
dout("check_cap_flush want %lld\n", want_flush_seq);
mutex_lock(&mdsc->mutex);
for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
struct ceph_mds_session *session = mdsc->sessions[mds];
if (!session)
continue;
get_session(session);
mutex_unlock(&mdsc->mutex);
mutex_lock(&session->s_mutex);
if (!list_empty(&session->s_cap_flushing)) {
struct ceph_inode_info *ci =
list_entry(session->s_cap_flushing.next,
struct ceph_inode_info,
i_flushing_item);
struct inode *inode = &ci->vfs_inode;
spin_lock(&ci->i_ceph_lock);
if (ci->i_cap_flush_seq <= want_flush_seq) {
dout("check_cap_flush still flushing %p "
"seq %lld <= %lld to mds%d\n", inode,
ci->i_cap_flush_seq, want_flush_seq,
session->s_mds);
ret = 0;
}
spin_unlock(&ci->i_ceph_lock);
}
mutex_unlock(&session->s_mutex);
ceph_put_mds_session(session);
if (!ret)
return ret;
mutex_lock(&mdsc->mutex);
}
mutex_unlock(&mdsc->mutex);
dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
return ret;
}
/*
* called under s_mutex
*/
void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_msg *msg;
dout("send_cap_releases mds%d\n", session->s_mds);
spin_lock(&session->s_cap_lock);
while (!list_empty(&session->s_cap_releases_done)) {
msg = list_first_entry(&session->s_cap_releases_done,
struct ceph_msg, list_head);
list_del_init(&msg->list_head);
spin_unlock(&session->s_cap_lock);
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);
spin_lock(&session->s_cap_lock);
}
spin_unlock(&session->s_cap_lock);
}
static void discard_cap_releases(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_msg *msg;
struct ceph_mds_cap_release *head;
unsigned num;
dout("discard_cap_releases mds%d\n", session->s_mds);
if (!list_empty(&session->s_cap_releases)) {
/* zero out the in-progress message */
msg = list_first_entry(&session->s_cap_releases,
struct ceph_msg, list_head);
head = msg->front.iov_base;
num = le32_to_cpu(head->num);
dout("discard_cap_releases mds%d %p %u\n",
session->s_mds, msg, num);
head->num = cpu_to_le32(0);
msg->front.iov_len = sizeof(*head);
session->s_num_cap_releases += num;
}
/* requeue completed messages */
while (!list_empty(&session->s_cap_releases_done)) {
msg = list_first_entry(&session->s_cap_releases_done,
struct ceph_msg, list_head);
list_del_init(&msg->list_head);
head = msg->front.iov_base;
num = le32_to_cpu(head->num);
dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
num);
session->s_num_cap_releases += num;
head->num = cpu_to_le32(0);
msg->front.iov_len = sizeof(*head);
list_add(&msg->list_head, &session->s_cap_releases);
}
}
/*
* 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(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) +
sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease);
int order, num_entries;
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, 1);
num_entries = min(num_entries, opt->max_readdir);
order = get_order(size * num_entries);
while (order >= 0) {
rinfo->dir_in = (void*)__get_free_pages(GFP_NOFS | __GFP_NOWARN,
order);
if (rinfo->dir_in)
break;
order--;
}
if (!rinfo->dir_in)
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 = kzalloc(sizeof(*req), GFP_NOFS);
if (!req)
return ERR_PTR(-ENOMEM);
mutex_init(&req->r_fill_mutex);
req->r_mdsc = mdsc;
req->r_started = jiffies;
req->r_resend_mds = -1;
INIT_LIST_HEAD(&req->r_unsafe_dir_item);
req->r_fmode = -1;
kref_init(&req->r_kref);
INIT_LIST_HEAD(&req->r_wait);
init_completion(&req->r_completion);
init_completion(&req->r_safe_completion);
INIT_LIST_HEAD(&req->r_unsafe_item);
req->r_stamp = CURRENT_TIME;
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 u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
{
struct ceph_mds_request *req = __get_oldest_req(mdsc);
if (req)
return req->r_tid;
return 0;
}
/*
* 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 *base,
int stop_on_nosnap)
{
struct dentry *temp;
char *path;
int len, pos;
unsigned seq;
if (dentry == NULL)
return ERR_PTR(-EINVAL);
retry:
len = 0;
seq = read_seqbegin(&rename_lock);
rcu_read_lock();
for (temp = dentry; !IS_ROOT(temp);) {
struct inode *inode = temp->d_inode;
if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
len++; /* slash only */
else if (stop_on_nosnap && inode &&
ceph_snap(inode) == CEPH_NOSNAP)
break;
else
len += 1 + temp->d_name.len;
temp = temp->d_parent;
}
rcu_read_unlock();
if (len)
len--; /* no leading '/' */
path = kmalloc(len+1, GFP_NOFS);
if (path == NULL)
return ERR_PTR(-ENOMEM);
pos = len;
path[pos] = 0; /* trailing null */
rcu_read_lock();
for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
struct inode *inode;
spin_lock(&temp->d_lock);
inode = temp->d_inode;
if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
dout("build_path path+%d: %p SNAPDIR\n",
pos, temp);
} else if (stop_on_nosnap && inode &&
ceph_snap(inode) == CEPH_NOSNAP) {
spin_unlock(&temp->d_lock);
break;
} else {
pos -= temp->d_name.len;
if (pos < 0) {
spin_unlock(&temp->d_lock);
break;
}
strncpy(path + pos, temp->d_name.name,
temp->d_name.len);
}
spin_unlock(&temp->d_lock);
if (pos)
path[--pos] = '/';
temp = temp->d_parent;
}
rcu_read_unlock();
if (pos != 0 || read_seqretry(&rename_lock, seq)) {
pr_err("build_path did not end path lookup where "
"expected, namelen is %d, pos is %d\n", len, pos);
/* presumably this is only possible if racing with a
rename of one of the parent directories (we can not
lock the dentries above us to prevent this, but
retrying should be harmless) */
kfree(path);
goto retry;
}
*base = ceph_ino(temp->d_inode);
*plen = len;
dout("build_path on %p %d built %llx '%.*s'\n",
dentry, d_count(dentry), *base, len, path);
return path;
}
static int build_dentry_path(struct dentry *dentry,
const char **ppath, int *ppathlen, u64 *pino,
int *pfreepath)
{
char *path;
if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
*pino = ceph_ino(dentry->d_parent->d_inode);
*ppath = dentry->d_name.name;
*ppathlen = dentry->d_name.len;
return 0;
}
path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
if (IS_ERR(path))
return PTR_ERR(path);
*ppath = path;
*pfreepath = 1;
return 0;
}
static int build_inode_path(struct inode *inode,
const char **ppath, int *ppathlen, u64 *pino,
int *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 = 1;
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,
const char *rpath, u64 rino,
const char **ppath, int *pathlen,
u64 *ino, int *freepath)
{
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, ppath, pathlen, ino, freepath);
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;
}
/*
* called under mdsc->mutex
*/
static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req,
int mds)
{
struct ceph_msg *msg;
struct ceph_mds_request_head *head;
const char *path1 = NULL;
const char *path2 = NULL;
u64 ino1 = 0, ino2 = 0;
int pathlen1 = 0, pathlen2 = 0;
int freepath1 = 0, freepath2 = 0;
int len;
u16 releases;
void *p, *end;
int ret;
ret = set_request_path_attr(req->r_inode, req->r_dentry,
req->r_path1, req->r_ino1.ino,
&path1, &pathlen1, &ino1, &freepath1);
if (ret < 0) {
msg = ERR_PTR(ret);
goto out;
}
ret = set_request_path_attr(NULL, req->r_old_dentry,
req->r_path2, req->r_ino2.ino,
&path2, &pathlen2, &ino2, &freepath2);
if (ret < 0) {
msg = ERR_PTR(ret);
goto out_free1;
}
len = sizeof(*head) +
pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
sizeof(struct timespec);
/* 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 += req->r_dentry->d_name.len;
if (req->r_old_dentry_drop)
len += req->r_old_dentry->d_name.len;
msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
if (!msg) {
msg = ERR_PTR(-ENOMEM);
goto out_free2;
}
msg->hdr.version = 2;
msg->hdr.tid = cpu_to_le64(req->r_tid);
head = msg->front.iov_base;
p = msg->front.iov_base + sizeof(*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_uid));
head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
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 : req->r_dentry->d_inode,
mds, req->r_inode_drop, req->r_inode_unless, 0);
if (req->r_dentry_drop)
releases += ceph_encode_dentry_release(&p, req->r_dentry,
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,
mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
if (req->r_old_inode_drop)
releases += ceph_encode_inode_release(&p,
req->r_old_dentry->d_inode,
mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
head->num_releases = cpu_to_le16(releases);
/* time stamp */
ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp));
BUG_ON(p > end);
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;
atomic_inc(&pagelist->refcnt);
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)
kfree((char *)path2);
out_free1:
if (freepath1)
kfree((char *)path1);
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)
{
if (req->r_callback)
req->r_callback(mdsc, req);
else
complete_all(&req->r_completion);
}
/*
* called under mdsc->mutex
*/
static int __prepare_send_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req,
int mds)
{
struct ceph_mds_request_head *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 (req->r_got_unsafe) {
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 = msg->front.iov_base;
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;
/* time stamp */
p = msg->front.iov_base + req->r_request_release_offset;
ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp));
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(mdsc, req, mds);
if (IS_ERR(msg)) {
req->r_err = PTR_ERR(msg);
complete_request(mdsc, req);
return PTR_ERR(msg);
}
req->r_request = msg;
rhead = msg->front.iov_base;
rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
if (req->r_got_unsafe)
flags |= CEPH_MDS_FLAG_REPLAY;
if (req->r_locked_dir)
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;
rhead->ino = 0;
dout(" r_locked_dir = %p\n", req->r_locked_dir);
return 0;
}
/*
* send request, or put it on the appropriate wait list.
*/
static int __do_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
struct ceph_mds_session *session = NULL;
int mds = -1;
int err = -EAGAIN;
if (req->r_err || req->r_got_result) {
if (req->r_aborted)
__unregister_request(mdsc, req);
goto out;
}
if (req->r_timeout &&
time_after_eq(jiffies, req->r_started + req->r_timeout)) {
dout("do_request timed out\n");
err = -EIO;
goto finish;
}
put_request_session(req);
mds = __choose_mds(mdsc, req);
if (mds < 0 ||
ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
dout("do_request no mds or not active, waiting for map\n");
list_add(&req->r_wait, &mdsc->waiting_for_map);
goto out;
}
/* 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 = get_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) {
if (session->s_state == CEPH_MDS_SESSION_NEW ||
session->s_state == CEPH_MDS_SESSION_CLOSING)
__open_session(mdsc, session);
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 = __prepare_send_request(mdsc, req, mds);
if (!err) {
ceph_msg_get(req->r_request);
ceph_con_send(&session->s_con, req->r_request);
}
out_session:
ceph_put_mds_session(session);
out:
return err;
finish:
req->r_err = err;
complete_request(mdsc, req);
goto out;
}
/*
* 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 (req->r_got_unsafe)
continue;
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);
}
}
}
void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
dout("submit_request on %p\n", req);
mutex_lock(&mdsc->mutex);
__register_request(mdsc, req, NULL);
__do_request(mdsc, req);
mutex_unlock(&mdsc->mutex);
}
/*
* 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);
/* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
if (req->r_inode)
ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
if (req->r_locked_dir)
ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
if (req->r_old_dentry_dir)
ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
CEPH_CAP_PIN);
/* issue */
mutex_lock(&mdsc->mutex);
__register_request(mdsc, req, dir);
__do_request(mdsc, req);
if (req->r_err) {
err = req->r_err;
__unregister_request(mdsc, req);
dout("do_request early error %d\n", err);
goto out;
}
/* wait */
mutex_unlock(&mdsc->mutex);
dout("do_request waiting\n");
if (req->r_timeout) {
err = (long)wait_for_completion_killable_timeout(
&req->r_completion, req->r_timeout);
if (err == 0)
err = -EIO;
} else {
err = wait_for_completion_killable(&req->r_completion);
}
dout("do_request waited, got %d\n", err);
mutex_lock(&mdsc->mutex);
/* only abort if we didn't race with a real reply */
if (req->r_got_result) {
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;
req->r_aborted = true;
mutex_unlock(&req->r_fill_mutex);
if (req->r_locked_dir &&
(req->r_op & CEPH_MDS_OP_WRITE))
ceph_invalidate_dir_request(req);
} else {
err = req->r_err;
}
out:
mutex_unlock(&mdsc->mutex);
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 *inode = req->r_locked_dir;
dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
ceph_dir_clear_complete(inode);
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 */
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_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 ((req->r_got_unsafe && !head->safe) ||
(req->r_got_safe && 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 (req->r_got_safe && !head->safe) {
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", req->r_tid);
req->r_resend_mds = -1;
if (req->r_direct_mode != USE_AUTH_MDS) {
dout("not using auth, setting for that now");
req->r_direct_mode = USE_AUTH_MDS;
__do_request(mdsc, req);
mutex_unlock(&mdsc->mutex);
goto out;
} else {
int mds = __choose_mds(mdsc, req);
if (mds >= 0 && mds != req->r_session->s_mds) {
dout("but auth changed, so resending");
__do_request(mdsc, req);
mutex_unlock(&mdsc->mutex);
goto out;
}
}
dout("have to return ESTALE on request %llu", req->r_tid);
}
if (head->safe) {
req->r_got_safe = true;
__unregister_request(mdsc, req);
if (req->r_got_unsafe) {
/*
* 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);
list_del_init(&req->r_unsafe_item);
/* last unsafe request during umount? */
if (mdsc->stopping && !__get_oldest_req(mdsc))
complete_all(&mdsc->safe_umount_waiters);
mutex_unlock(&mdsc->mutex);
goto out;
}
} else {
req->r_got_unsafe = true;
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;
err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
mutex_unlock(&mdsc->mutex);
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 */
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);
downgrade_write(&mdsc->snap_rwsem);
} else {
down_read(&mdsc->snap_rwsem);
}
/* insert trace into our cache */
mutex_lock(&req->r_fill_mutex);
err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
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);
ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
}
mutex_unlock(&req->r_fill_mutex);
up_read(&mdsc->snap_rwsem);
out_err:
mutex_lock(&mdsc->mutex);
if (!req->r_aborted) {
if (err) {
req->r_err = err;
} else {
req->r_reply = msg;
ceph_msg_get(msg);
req->r_got_result = true;
}
} else {
dout("reply arrived after request %lld was aborted\n", tid);
}
mutex_unlock(&mdsc->mutex);
ceph_add_cap_releases(mdsc, req->r_session);
mutex_unlock(&session->s_mutex);
/* kick calling process */
complete_request(mdsc, req);
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_request(mdsc, tid);
if (!req) {
dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
goto out; /* dup reply? */
}
if (req->r_aborted) {
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(req->r_got_result);
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);
}
/*
* 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;
u32 op;
u64 seq;
int mds = session->s_mds;
struct ceph_mds_session_head *h = msg->front.iov_base;
int wake = 0;
/* decode */
if (msg->front.iov_len != sizeof(*h))
goto bad;
op = le32_to_cpu(h->op);
seq = le64_to_cpu(h->seq);
mutex_lock(&mdsc->mutex);
if (op == CEPH_SESSION_CLOSE)
__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;
renewed_caps(mdsc, session, 0);
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);
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:
trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
break;
case CEPH_SESSION_FLUSHMSG:
send_flushmsg_ack(mdsc, session, seq);
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);
}
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;
}
/*
* 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;
int err;
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) {
err = __prepare_send_request(mdsc, req, session->s_mds);
if (!err) {
ceph_msg_get(req->r_request);
ceph_con_send(&session->s_con, req->r_request);
}
}
mutex_unlock(&mdsc->mutex);
}
/*
* Encode information about a cap for a reconnect with the MDS.
*/
static int encode_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;
size_t reclen;
struct ceph_inode_info *ci;
struct ceph_reconnect_state *recon_state = arg;
struct ceph_pagelist *pagelist = recon_state->pagelist;
char *path;
int pathlen, err;
u64 pathbase;
struct dentry *dentry;
ci = cap->ci;
dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
inode, ceph_vinop(inode), cap, cap->cap_id,
ceph_cap_string(cap->issued));
err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
if (err)
return err;
dentry = d_find_alias(inode);
if (dentry) {
path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
if (IS_ERR(path)) {
err = PTR_ERR(path);
goto out_dput;
}
} else {
path = NULL;
pathlen = 0;
}
err = ceph_pagelist_encode_string(pagelist, path, pathlen);
if (err)
goto out_free;
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;
if (recon_state->flock) {
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 = 0;
reclen = sizeof(rec.v2);
} 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(inode->i_size);
ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
rec.v1.pathbase = cpu_to_le64(pathbase);
reclen = sizeof(rec.v1);
}
spin_unlock(&ci->i_ceph_lock);
if (recon_state->flock) {
int num_fcntl_locks, num_flock_locks;
struct ceph_filelock *flocks;
encode_again:
spin_lock(&inode->i_lock);
ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
spin_unlock(&inode->i_lock);
flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
sizeof(struct ceph_filelock), GFP_NOFS);
if (!flocks) {
err = -ENOMEM;
goto out_free;
}
spin_lock(&inode->i_lock);
err = ceph_encode_locks_to_buffer(inode, flocks,
num_fcntl_locks,
num_flock_locks);
spin_unlock(&inode->i_lock);
if (err) {
kfree(flocks);
if (err == -ENOSPC)
goto encode_again;
goto out_free;
}