blob: 36a8dc699448c66eead329bea2b1b43ca0966d8e [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/ceph_debug.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/wait.h>
#include <linux/writeback.h>
#include "super.h"
#include "mds_client.h"
#include "cache.h"
#include <linux/ceph/decode.h>
#include <linux/ceph/messenger.h>
/*
* Capability management
*
* The Ceph metadata servers control client access to inode metadata
* and file data by issuing capabilities, granting clients permission
* to read and/or write both inode field and file data to OSDs
* (storage nodes). Each capability consists of a set of bits
* indicating which operations are allowed.
*
* If the client holds a *_SHARED cap, the client has a coherent value
* that can be safely read from the cached inode.
*
* In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
* client is allowed to change inode attributes (e.g., file size,
* mtime), note its dirty state in the ceph_cap, and asynchronously
* flush that metadata change to the MDS.
*
* In the event of a conflicting operation (perhaps by another
* client), the MDS will revoke the conflicting client capabilities.
*
* In order for a client to cache an inode, it must hold a capability
* with at least one MDS server. When inodes are released, release
* notifications are batched and periodically sent en masse to the MDS
* cluster to release server state.
*/
static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc);
static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
struct ceph_inode_info *ci,
u64 oldest_flush_tid);
/*
* Generate readable cap strings for debugging output.
*/
#define MAX_CAP_STR 20
static char cap_str[MAX_CAP_STR][40];
static DEFINE_SPINLOCK(cap_str_lock);
static int last_cap_str;
static char *gcap_string(char *s, int c)
{
if (c & CEPH_CAP_GSHARED)
*s++ = 's';
if (c & CEPH_CAP_GEXCL)
*s++ = 'x';
if (c & CEPH_CAP_GCACHE)
*s++ = 'c';
if (c & CEPH_CAP_GRD)
*s++ = 'r';
if (c & CEPH_CAP_GWR)
*s++ = 'w';
if (c & CEPH_CAP_GBUFFER)
*s++ = 'b';
if (c & CEPH_CAP_GWREXTEND)
*s++ = 'a';
if (c & CEPH_CAP_GLAZYIO)
*s++ = 'l';
return s;
}
const char *ceph_cap_string(int caps)
{
int i;
char *s;
int c;
spin_lock(&cap_str_lock);
i = last_cap_str++;
if (last_cap_str == MAX_CAP_STR)
last_cap_str = 0;
spin_unlock(&cap_str_lock);
s = cap_str[i];
if (caps & CEPH_CAP_PIN)
*s++ = 'p';
c = (caps >> CEPH_CAP_SAUTH) & 3;
if (c) {
*s++ = 'A';
s = gcap_string(s, c);
}
c = (caps >> CEPH_CAP_SLINK) & 3;
if (c) {
*s++ = 'L';
s = gcap_string(s, c);
}
c = (caps >> CEPH_CAP_SXATTR) & 3;
if (c) {
*s++ = 'X';
s = gcap_string(s, c);
}
c = caps >> CEPH_CAP_SFILE;
if (c) {
*s++ = 'F';
s = gcap_string(s, c);
}
if (s == cap_str[i])
*s++ = '-';
*s = 0;
return cap_str[i];
}
void ceph_caps_init(struct ceph_mds_client *mdsc)
{
INIT_LIST_HEAD(&mdsc->caps_list);
spin_lock_init(&mdsc->caps_list_lock);
}
void ceph_caps_finalize(struct ceph_mds_client *mdsc)
{
struct ceph_cap *cap;
spin_lock(&mdsc->caps_list_lock);
while (!list_empty(&mdsc->caps_list)) {
cap = list_first_entry(&mdsc->caps_list,
struct ceph_cap, caps_item);
list_del(&cap->caps_item);
kmem_cache_free(ceph_cap_cachep, cap);
}
mdsc->caps_total_count = 0;
mdsc->caps_avail_count = 0;
mdsc->caps_use_count = 0;
mdsc->caps_reserve_count = 0;
mdsc->caps_min_count = 0;
spin_unlock(&mdsc->caps_list_lock);
}
void ceph_adjust_caps_max_min(struct ceph_mds_client *mdsc,
struct ceph_mount_options *fsopt)
{
spin_lock(&mdsc->caps_list_lock);
mdsc->caps_min_count = fsopt->max_readdir;
if (mdsc->caps_min_count < 1024)
mdsc->caps_min_count = 1024;
mdsc->caps_use_max = fsopt->caps_max;
if (mdsc->caps_use_max > 0 &&
mdsc->caps_use_max < mdsc->caps_min_count)
mdsc->caps_use_max = mdsc->caps_min_count;
spin_unlock(&mdsc->caps_list_lock);
}
static void __ceph_unreserve_caps(struct ceph_mds_client *mdsc, int nr_caps)
{
struct ceph_cap *cap;
int i;
if (nr_caps) {
BUG_ON(mdsc->caps_reserve_count < nr_caps);
mdsc->caps_reserve_count -= nr_caps;
if (mdsc->caps_avail_count >=
mdsc->caps_reserve_count + mdsc->caps_min_count) {
mdsc->caps_total_count -= nr_caps;
for (i = 0; i < nr_caps; i++) {
cap = list_first_entry(&mdsc->caps_list,
struct ceph_cap, caps_item);
list_del(&cap->caps_item);
kmem_cache_free(ceph_cap_cachep, cap);
}
} else {
mdsc->caps_avail_count += nr_caps;
}
dout("%s: caps %d = %d used + %d resv + %d avail\n",
__func__,
mdsc->caps_total_count, mdsc->caps_use_count,
mdsc->caps_reserve_count, mdsc->caps_avail_count);
BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
mdsc->caps_reserve_count +
mdsc->caps_avail_count);
}
}
/*
* Called under mdsc->mutex.
*/
int ceph_reserve_caps(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx, int need)
{
int i, j;
struct ceph_cap *cap;
int have;
int alloc = 0;
int max_caps;
int err = 0;
bool trimmed = false;
struct ceph_mds_session *s;
LIST_HEAD(newcaps);
dout("reserve caps ctx=%p need=%d\n", ctx, need);
/* first reserve any caps that are already allocated */
spin_lock(&mdsc->caps_list_lock);
if (mdsc->caps_avail_count >= need)
have = need;
else
have = mdsc->caps_avail_count;
mdsc->caps_avail_count -= have;
mdsc->caps_reserve_count += have;
BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
mdsc->caps_reserve_count +
mdsc->caps_avail_count);
spin_unlock(&mdsc->caps_list_lock);
for (i = have; i < need; ) {
cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
if (cap) {
list_add(&cap->caps_item, &newcaps);
alloc++;
i++;
continue;
}
if (!trimmed) {
for (j = 0; j < mdsc->max_sessions; j++) {
s = __ceph_lookup_mds_session(mdsc, j);
if (!s)
continue;
mutex_unlock(&mdsc->mutex);
mutex_lock(&s->s_mutex);
max_caps = s->s_nr_caps - (need - i);
ceph_trim_caps(mdsc, s, max_caps);
mutex_unlock(&s->s_mutex);
ceph_put_mds_session(s);
mutex_lock(&mdsc->mutex);
}
trimmed = true;
spin_lock(&mdsc->caps_list_lock);
if (mdsc->caps_avail_count) {
int more_have;
if (mdsc->caps_avail_count >= need - i)
more_have = need - i;
else
more_have = mdsc->caps_avail_count;
i += more_have;
have += more_have;
mdsc->caps_avail_count -= more_have;
mdsc->caps_reserve_count += more_have;
}
spin_unlock(&mdsc->caps_list_lock);
continue;
}
pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
ctx, need, have + alloc);
err = -ENOMEM;
break;
}
if (!err) {
BUG_ON(have + alloc != need);
ctx->count = need;
ctx->used = 0;
}
spin_lock(&mdsc->caps_list_lock);
mdsc->caps_total_count += alloc;
mdsc->caps_reserve_count += alloc;
list_splice(&newcaps, &mdsc->caps_list);
BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
mdsc->caps_reserve_count +
mdsc->caps_avail_count);
if (err)
__ceph_unreserve_caps(mdsc, have + alloc);
spin_unlock(&mdsc->caps_list_lock);
dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
ctx, mdsc->caps_total_count, mdsc->caps_use_count,
mdsc->caps_reserve_count, mdsc->caps_avail_count);
return err;
}
void ceph_unreserve_caps(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx)
{
bool reclaim = false;
if (!ctx->count)
return;
dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
spin_lock(&mdsc->caps_list_lock);
__ceph_unreserve_caps(mdsc, ctx->count);
ctx->count = 0;
if (mdsc->caps_use_max > 0 &&
mdsc->caps_use_count > mdsc->caps_use_max)
reclaim = true;
spin_unlock(&mdsc->caps_list_lock);
if (reclaim)
ceph_reclaim_caps_nr(mdsc, ctx->used);
}
struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx)
{
struct ceph_cap *cap = NULL;
/* temporary, until we do something about cap import/export */
if (!ctx) {
cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
if (cap) {
spin_lock(&mdsc->caps_list_lock);
mdsc->caps_use_count++;
mdsc->caps_total_count++;
spin_unlock(&mdsc->caps_list_lock);
} else {
spin_lock(&mdsc->caps_list_lock);
if (mdsc->caps_avail_count) {
BUG_ON(list_empty(&mdsc->caps_list));
mdsc->caps_avail_count--;
mdsc->caps_use_count++;
cap = list_first_entry(&mdsc->caps_list,
struct ceph_cap, caps_item);
list_del(&cap->caps_item);
BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
mdsc->caps_reserve_count + mdsc->caps_avail_count);
}
spin_unlock(&mdsc->caps_list_lock);
}
return cap;
}
spin_lock(&mdsc->caps_list_lock);
dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
mdsc->caps_reserve_count, mdsc->caps_avail_count);
BUG_ON(!ctx->count);
BUG_ON(ctx->count > mdsc->caps_reserve_count);
BUG_ON(list_empty(&mdsc->caps_list));
ctx->count--;
ctx->used++;
mdsc->caps_reserve_count--;
mdsc->caps_use_count++;
cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
list_del(&cap->caps_item);
BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
mdsc->caps_reserve_count + mdsc->caps_avail_count);
spin_unlock(&mdsc->caps_list_lock);
return cap;
}
void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
{
spin_lock(&mdsc->caps_list_lock);
dout("put_cap %p %d = %d used + %d resv + %d avail\n",
cap, mdsc->caps_total_count, mdsc->caps_use_count,
mdsc->caps_reserve_count, mdsc->caps_avail_count);
mdsc->caps_use_count--;
/*
* Keep some preallocated caps around (ceph_min_count), to
* avoid lots of free/alloc churn.
*/
if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
mdsc->caps_min_count) {
mdsc->caps_total_count--;
kmem_cache_free(ceph_cap_cachep, cap);
} else {
mdsc->caps_avail_count++;
list_add(&cap->caps_item, &mdsc->caps_list);
}
BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
mdsc->caps_reserve_count + mdsc->caps_avail_count);
spin_unlock(&mdsc->caps_list_lock);
}
void ceph_reservation_status(struct ceph_fs_client *fsc,
int *total, int *avail, int *used, int *reserved,
int *min)
{
struct ceph_mds_client *mdsc = fsc->mdsc;
spin_lock(&mdsc->caps_list_lock);
if (total)
*total = mdsc->caps_total_count;
if (avail)
*avail = mdsc->caps_avail_count;
if (used)
*used = mdsc->caps_use_count;
if (reserved)
*reserved = mdsc->caps_reserve_count;
if (min)
*min = mdsc->caps_min_count;
spin_unlock(&mdsc->caps_list_lock);
}
/*
* Find ceph_cap for given mds, if any.
*
* Called with i_ceph_lock held.
*/
static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
{
struct ceph_cap *cap;
struct rb_node *n = ci->i_caps.rb_node;
while (n) {
cap = rb_entry(n, struct ceph_cap, ci_node);
if (mds < cap->mds)
n = n->rb_left;
else if (mds > cap->mds)
n = n->rb_right;
else
return cap;
}
return NULL;
}
struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
{
struct ceph_cap *cap;
spin_lock(&ci->i_ceph_lock);
cap = __get_cap_for_mds(ci, mds);
spin_unlock(&ci->i_ceph_lock);
return cap;
}
/*
* Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
*/
static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
{
struct ceph_cap *cap;
int mds = -1;
struct rb_node *p;
/* prefer mds with WR|BUFFER|EXCL caps */
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
cap = rb_entry(p, struct ceph_cap, ci_node);
mds = cap->mds;
if (cap->issued & (CEPH_CAP_FILE_WR |
CEPH_CAP_FILE_BUFFER |
CEPH_CAP_FILE_EXCL))
break;
}
return mds;
}
int ceph_get_cap_mds(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int mds;
spin_lock(&ci->i_ceph_lock);
mds = __ceph_get_cap_mds(ceph_inode(inode));
spin_unlock(&ci->i_ceph_lock);
return mds;
}
/*
* Called under i_ceph_lock.
*/
static void __insert_cap_node(struct ceph_inode_info *ci,
struct ceph_cap *new)
{
struct rb_node **p = &ci->i_caps.rb_node;
struct rb_node *parent = NULL;
struct ceph_cap *cap = NULL;
while (*p) {
parent = *p;
cap = rb_entry(parent, struct ceph_cap, ci_node);
if (new->mds < cap->mds)
p = &(*p)->rb_left;
else if (new->mds > cap->mds)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(&new->ci_node, parent, p);
rb_insert_color(&new->ci_node, &ci->i_caps);
}
/*
* (re)set cap hold timeouts, which control the delayed release
* of unused caps back to the MDS. Should be called on cap use.
*/
static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
struct ceph_inode_info *ci)
{
struct ceph_mount_options *opt = mdsc->fsc->mount_options;
ci->i_hold_caps_min = round_jiffies(jiffies +
opt->caps_wanted_delay_min * HZ);
ci->i_hold_caps_max = round_jiffies(jiffies +
opt->caps_wanted_delay_max * HZ);
dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
}
/*
* (Re)queue cap at the end of the delayed cap release list.
*
* If I_FLUSH is set, leave the inode at the front of the list.
*
* Caller holds i_ceph_lock
* -> we take mdsc->cap_delay_lock
*/
static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
struct ceph_inode_info *ci,
bool set_timeout)
{
dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
ci->i_ceph_flags, ci->i_hold_caps_max);
if (!mdsc->stopping) {
spin_lock(&mdsc->cap_delay_lock);
if (!list_empty(&ci->i_cap_delay_list)) {
if (ci->i_ceph_flags & CEPH_I_FLUSH)
goto no_change;
list_del_init(&ci->i_cap_delay_list);
}
if (set_timeout)
__cap_set_timeouts(mdsc, ci);
list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
no_change:
spin_unlock(&mdsc->cap_delay_lock);
}
}
/*
* Queue an inode for immediate writeback. Mark inode with I_FLUSH,
* indicating we should send a cap message to flush dirty metadata
* asap, and move to the front of the delayed cap list.
*/
static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
struct ceph_inode_info *ci)
{
dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
spin_lock(&mdsc->cap_delay_lock);
ci->i_ceph_flags |= CEPH_I_FLUSH;
if (!list_empty(&ci->i_cap_delay_list))
list_del_init(&ci->i_cap_delay_list);
list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
spin_unlock(&mdsc->cap_delay_lock);
}
/*
* Cancel delayed work on cap.
*
* Caller must hold i_ceph_lock.
*/
static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
struct ceph_inode_info *ci)
{
dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
if (list_empty(&ci->i_cap_delay_list))
return;
spin_lock(&mdsc->cap_delay_lock);
list_del_init(&ci->i_cap_delay_list);
spin_unlock(&mdsc->cap_delay_lock);
}
/*
* Common issue checks for add_cap, handle_cap_grant.
*/
static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
unsigned issued)
{
unsigned had = __ceph_caps_issued(ci, NULL);
/*
* Each time we receive FILE_CACHE anew, we increment
* i_rdcache_gen.
*/
if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
(had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) {
ci->i_rdcache_gen++;
}
/*
* If FILE_SHARED is newly issued, mark dir not complete. We don't
* know what happened to this directory while we didn't have the cap.
* If FILE_SHARED is being revoked, also mark dir not complete. It
* stops on-going cached readdir.
*/
if ((issued & CEPH_CAP_FILE_SHARED) != (had & CEPH_CAP_FILE_SHARED)) {
if (issued & CEPH_CAP_FILE_SHARED)
atomic_inc(&ci->i_shared_gen);
if (S_ISDIR(ci->vfs_inode.i_mode)) {
dout(" marking %p NOT complete\n", &ci->vfs_inode);
__ceph_dir_clear_complete(ci);
}
}
}
/*
* Add a capability under the given MDS session.
*
* Caller should hold session snap_rwsem (read) and s_mutex.
*
* @fmode is the open file mode, if we are opening a file, otherwise
* it is < 0. (This is so we can atomically add the cap and add an
* open file reference to it.)
*/
void ceph_add_cap(struct inode *inode,
struct ceph_mds_session *session, u64 cap_id,
int fmode, unsigned issued, unsigned wanted,
unsigned seq, unsigned mseq, u64 realmino, int flags,
struct ceph_cap **new_cap)
{
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_cap *cap;
int mds = session->s_mds;
int actual_wanted;
dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
session->s_mds, cap_id, ceph_cap_string(issued), seq);
/*
* If we are opening the file, include file mode wanted bits
* in wanted.
*/
if (fmode >= 0)
wanted |= ceph_caps_for_mode(fmode);
cap = __get_cap_for_mds(ci, mds);
if (!cap) {
cap = *new_cap;
*new_cap = NULL;
cap->issued = 0;
cap->implemented = 0;
cap->mds = mds;
cap->mds_wanted = 0;
cap->mseq = 0;
cap->ci = ci;
__insert_cap_node(ci, cap);
/* add to session cap list */
cap->session = session;
spin_lock(&session->s_cap_lock);
list_add_tail(&cap->session_caps, &session->s_caps);
session->s_nr_caps++;
spin_unlock(&session->s_cap_lock);
} else {
spin_lock(&session->s_cap_lock);
list_move_tail(&cap->session_caps, &session->s_caps);
spin_unlock(&session->s_cap_lock);
if (cap->cap_gen < session->s_cap_gen)
cap->issued = cap->implemented = CEPH_CAP_PIN;
/*
* auth mds of the inode changed. we received the cap export
* message, but still haven't received the cap import message.
* handle_cap_export() updated the new auth MDS' cap.
*
* "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
* a message that was send before the cap import message. So
* don't remove caps.
*/
if (ceph_seq_cmp(seq, cap->seq) <= 0) {
WARN_ON(cap != ci->i_auth_cap);
WARN_ON(cap->cap_id != cap_id);
seq = cap->seq;
mseq = cap->mseq;
issued |= cap->issued;
flags |= CEPH_CAP_FLAG_AUTH;
}
}
if (!ci->i_snap_realm ||
((flags & CEPH_CAP_FLAG_AUTH) &&
realmino != (u64)-1 && ci->i_snap_realm->ino != realmino)) {
/*
* add this inode to the appropriate snap realm
*/
struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
realmino);
if (realm) {
struct ceph_snap_realm *oldrealm = ci->i_snap_realm;
if (oldrealm) {
spin_lock(&oldrealm->inodes_with_caps_lock);
list_del_init(&ci->i_snap_realm_item);
spin_unlock(&oldrealm->inodes_with_caps_lock);
}
spin_lock(&realm->inodes_with_caps_lock);
list_add(&ci->i_snap_realm_item,
&realm->inodes_with_caps);
ci->i_snap_realm = realm;
if (realm->ino == ci->i_vino.ino)
realm->inode = inode;
spin_unlock(&realm->inodes_with_caps_lock);
if (oldrealm)
ceph_put_snap_realm(mdsc, oldrealm);
} else {
pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
realmino);
WARN_ON(!realm);
}
}
__check_cap_issue(ci, cap, issued);
/*
* If we are issued caps we don't want, or the mds' wanted
* value appears to be off, queue a check so we'll release
* later and/or update the mds wanted value.
*/
actual_wanted = __ceph_caps_wanted(ci);
if ((wanted & ~actual_wanted) ||
(issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
dout(" issued %s, mds wanted %s, actual %s, queueing\n",
ceph_cap_string(issued), ceph_cap_string(wanted),
ceph_cap_string(actual_wanted));
__cap_delay_requeue(mdsc, ci, true);
}
if (flags & CEPH_CAP_FLAG_AUTH) {
if (!ci->i_auth_cap ||
ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
ci->i_auth_cap = cap;
cap->mds_wanted = wanted;
}
} else {
WARN_ON(ci->i_auth_cap == cap);
}
dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
ceph_cap_string(issued|cap->issued), seq, mds);
cap->cap_id = cap_id;
cap->issued = issued;
cap->implemented |= issued;
if (ceph_seq_cmp(mseq, cap->mseq) > 0)
cap->mds_wanted = wanted;
else
cap->mds_wanted |= wanted;
cap->seq = seq;
cap->issue_seq = seq;
cap->mseq = mseq;
cap->cap_gen = session->s_cap_gen;
if (fmode >= 0)
__ceph_get_fmode(ci, fmode);
}
/*
* Return true if cap has not timed out and belongs to the current
* generation of the MDS session (i.e. has not gone 'stale' due to
* us losing touch with the mds).
*/
static int __cap_is_valid(struct ceph_cap *cap)
{
unsigned long ttl;
u32 gen;
spin_lock(&cap->session->s_gen_ttl_lock);
gen = cap->session->s_cap_gen;
ttl = cap->session->s_cap_ttl;
spin_unlock(&cap->session->s_gen_ttl_lock);
if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
dout("__cap_is_valid %p cap %p issued %s "
"but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
return 0;
}
return 1;
}
/*
* Return set of valid cap bits issued to us. Note that caps time
* out, and may be invalidated in bulk if the client session times out
* and session->s_cap_gen is bumped.
*/
int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
{
int have = ci->i_snap_caps;
struct ceph_cap *cap;
struct rb_node *p;
if (implemented)
*implemented = 0;
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
cap = rb_entry(p, struct ceph_cap, ci_node);
if (!__cap_is_valid(cap))
continue;
dout("__ceph_caps_issued %p cap %p issued %s\n",
&ci->vfs_inode, cap, ceph_cap_string(cap->issued));
have |= cap->issued;
if (implemented)
*implemented |= cap->implemented;
}
/*
* exclude caps issued by non-auth MDS, but are been revoking
* by the auth MDS. The non-auth MDS should be revoking/exporting
* these caps, but the message is delayed.
*/
if (ci->i_auth_cap) {
cap = ci->i_auth_cap;
have &= ~cap->implemented | cap->issued;
}
return have;
}
/*
* Get cap bits issued by caps other than @ocap
*/
int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
{
int have = ci->i_snap_caps;
struct ceph_cap *cap;
struct rb_node *p;
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
cap = rb_entry(p, struct ceph_cap, ci_node);
if (cap == ocap)
continue;
if (!__cap_is_valid(cap))
continue;
have |= cap->issued;
}
return have;
}
/*
* Move a cap to the end of the LRU (oldest caps at list head, newest
* at list tail).
*/
static void __touch_cap(struct ceph_cap *cap)
{
struct ceph_mds_session *s = cap->session;
spin_lock(&s->s_cap_lock);
if (!s->s_cap_iterator) {
dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
s->s_mds);
list_move_tail(&cap->session_caps, &s->s_caps);
} else {
dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
&cap->ci->vfs_inode, cap, s->s_mds);
}
spin_unlock(&s->s_cap_lock);
}
/*
* Check if we hold the given mask. If so, move the cap(s) to the
* front of their respective LRUs. (This is the preferred way for
* callers to check for caps they want.)
*/
int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
{
struct ceph_cap *cap;
struct rb_node *p;
int have = ci->i_snap_caps;
if ((have & mask) == mask) {
dout("__ceph_caps_issued_mask %p snap issued %s"
" (mask %s)\n", &ci->vfs_inode,
ceph_cap_string(have),
ceph_cap_string(mask));
return 1;
}
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
cap = rb_entry(p, struct ceph_cap, ci_node);
if (!__cap_is_valid(cap))
continue;
if ((cap->issued & mask) == mask) {
dout("__ceph_caps_issued_mask %p cap %p issued %s"
" (mask %s)\n", &ci->vfs_inode, cap,
ceph_cap_string(cap->issued),
ceph_cap_string(mask));
if (touch)
__touch_cap(cap);
return 1;
}
/* does a combination of caps satisfy mask? */
have |= cap->issued;
if ((have & mask) == mask) {
dout("__ceph_caps_issued_mask %p combo issued %s"
" (mask %s)\n", &ci->vfs_inode,
ceph_cap_string(cap->issued),
ceph_cap_string(mask));
if (touch) {
struct rb_node *q;
/* touch this + preceding caps */
__touch_cap(cap);
for (q = rb_first(&ci->i_caps); q != p;
q = rb_next(q)) {
cap = rb_entry(q, struct ceph_cap,
ci_node);
if (!__cap_is_valid(cap))
continue;
__touch_cap(cap);
}
}
return 1;
}
}
return 0;
}
/*
* Return true if mask caps are currently being revoked by an MDS.
*/
int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
struct ceph_cap *ocap, int mask)
{
struct ceph_cap *cap;
struct rb_node *p;
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
cap = rb_entry(p, struct ceph_cap, ci_node);
if (cap != ocap &&
(cap->implemented & ~cap->issued & mask))
return 1;
}
return 0;
}
int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
{
struct inode *inode = &ci->vfs_inode;
int ret;
spin_lock(&ci->i_ceph_lock);
ret = __ceph_caps_revoking_other(ci, NULL, mask);
spin_unlock(&ci->i_ceph_lock);
dout("ceph_caps_revoking %p %s = %d\n", inode,
ceph_cap_string(mask), ret);
return ret;
}
int __ceph_caps_used(struct ceph_inode_info *ci)
{
int used = 0;
if (ci->i_pin_ref)
used |= CEPH_CAP_PIN;
if (ci->i_rd_ref)
used |= CEPH_CAP_FILE_RD;
if (ci->i_rdcache_ref ||
(!S_ISDIR(ci->vfs_inode.i_mode) && /* ignore readdir cache */
ci->vfs_inode.i_data.nrpages))
used |= CEPH_CAP_FILE_CACHE;
if (ci->i_wr_ref)
used |= CEPH_CAP_FILE_WR;
if (ci->i_wb_ref || ci->i_wrbuffer_ref)
used |= CEPH_CAP_FILE_BUFFER;
return used;
}
/*
* wanted, by virtue of open file modes
*/
int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
{
int i, bits = 0;
for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
if (ci->i_nr_by_mode[i])
bits |= 1 << i;
}
if (bits == 0)
return 0;
return ceph_caps_for_mode(bits >> 1);
}
/*
* Return caps we have registered with the MDS(s) as 'wanted'.
*/
int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check)
{
struct ceph_cap *cap;
struct rb_node *p;
int mds_wanted = 0;
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
cap = rb_entry(p, struct ceph_cap, ci_node);
if (check && !__cap_is_valid(cap))
continue;
if (cap == ci->i_auth_cap)
mds_wanted |= cap->mds_wanted;
else
mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
}
return mds_wanted;
}
/*
* called under i_ceph_lock
*/
static int __ceph_is_single_caps(struct ceph_inode_info *ci)
{
return rb_first(&ci->i_caps) == rb_last(&ci->i_caps);
}
static int __ceph_is_any_caps(struct ceph_inode_info *ci)
{
return !RB_EMPTY_ROOT(&ci->i_caps);
}
int ceph_is_any_caps(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int ret;
spin_lock(&ci->i_ceph_lock);
ret = __ceph_is_any_caps(ci);
spin_unlock(&ci->i_ceph_lock);
return ret;
}
static void drop_inode_snap_realm(struct ceph_inode_info *ci)
{
struct ceph_snap_realm *realm = ci->i_snap_realm;
spin_lock(&realm->inodes_with_caps_lock);
list_del_init(&ci->i_snap_realm_item);
ci->i_snap_realm_counter++;
ci->i_snap_realm = NULL;
if (realm->ino == ci->i_vino.ino)
realm->inode = NULL;
spin_unlock(&realm->inodes_with_caps_lock);
ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc,
realm);
}
/*
* Remove a cap. Take steps to deal with a racing iterate_session_caps.
*
* caller should hold i_ceph_lock.
* caller will not hold session s_mutex if called from destroy_inode.
*/
void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
{
struct ceph_mds_session *session = cap->session;
struct ceph_inode_info *ci = cap->ci;
struct ceph_mds_client *mdsc =
ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
int removed = 0;
dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
/* remove from session list */
spin_lock(&session->s_cap_lock);
if (session->s_cap_iterator == cap) {
/* not yet, we are iterating over this very cap */
dout("__ceph_remove_cap delaying %p removal from session %p\n",
cap, cap->session);
} else {
list_del_init(&cap->session_caps);
session->s_nr_caps--;
cap->session = NULL;
removed = 1;
}
/* protect backpointer with s_cap_lock: see iterate_session_caps */
cap->ci = NULL;
/*
* s_cap_reconnect is protected by s_cap_lock. no one changes
* s_cap_gen while session is in the reconnect state.
*/
if (queue_release &&
(!session->s_cap_reconnect || cap->cap_gen == session->s_cap_gen)) {
cap->queue_release = 1;
if (removed) {
__ceph_queue_cap_release(session, cap);
removed = 0;
}
} else {
cap->queue_release = 0;
}
cap->cap_ino = ci->i_vino.ino;
spin_unlock(&session->s_cap_lock);
/* remove from inode list */
rb_erase(&cap->ci_node, &ci->i_caps);
if (ci->i_auth_cap == cap)
ci->i_auth_cap = NULL;
if (removed)
ceph_put_cap(mdsc, cap);
/* when reconnect denied, we remove session caps forcibly,
* i_wr_ref can be non-zero. If there are ongoing write,
* keep i_snap_realm.
*/
if (!__ceph_is_any_caps(ci) && ci->i_wr_ref == 0 && ci->i_snap_realm)
drop_inode_snap_realm(ci);
if (!__ceph_is_any_real_caps(ci))
__cap_delay_cancel(mdsc, ci);
}
struct cap_msg_args {
struct ceph_mds_session *session;
u64 ino, cid, follows;
u64 flush_tid, oldest_flush_tid, size, max_size;
u64 xattr_version;
struct ceph_buffer *xattr_buf;
struct timespec64 atime, mtime, ctime;
int op, caps, wanted, dirty;
u32 seq, issue_seq, mseq, time_warp_seq;
u32 flags;
kuid_t uid;
kgid_t gid;
umode_t mode;
bool inline_data;
};
/*
* Build and send a cap message to the given MDS.
*
* Caller should be holding s_mutex.
*/
static int send_cap_msg(struct cap_msg_args *arg)
{
struct ceph_mds_caps *fc;
struct ceph_msg *msg;
void *p;
size_t extra_len;
struct timespec64 zerotime = {0};
struct ceph_osd_client *osdc = &arg->session->s_mdsc->fsc->client->osdc;
dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
" seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu"
" xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(arg->op),
arg->cid, arg->ino, ceph_cap_string(arg->caps),
ceph_cap_string(arg->wanted), ceph_cap_string(arg->dirty),
arg->seq, arg->issue_seq, arg->flush_tid, arg->oldest_flush_tid,
arg->mseq, arg->follows, arg->size, arg->max_size,
arg->xattr_version,
arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0);
/* flock buffer size + inline version + inline data size +
* osd_epoch_barrier + oldest_flush_tid */
extra_len = 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4;
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc) + extra_len,
GFP_NOFS, false);
if (!msg)
return -ENOMEM;
msg->hdr.version = cpu_to_le16(10);
msg->hdr.tid = cpu_to_le64(arg->flush_tid);
fc = msg->front.iov_base;
memset(fc, 0, sizeof(*fc));
fc->cap_id = cpu_to_le64(arg->cid);
fc->op = cpu_to_le32(arg->op);
fc->seq = cpu_to_le32(arg->seq);
fc->issue_seq = cpu_to_le32(arg->issue_seq);
fc->migrate_seq = cpu_to_le32(arg->mseq);
fc->caps = cpu_to_le32(arg->caps);
fc->wanted = cpu_to_le32(arg->wanted);
fc->dirty = cpu_to_le32(arg->dirty);
fc->ino = cpu_to_le64(arg->ino);
fc->snap_follows = cpu_to_le64(arg->follows);
fc->size = cpu_to_le64(arg->size);
fc->max_size = cpu_to_le64(arg->max_size);
ceph_encode_timespec64(&fc->mtime, &arg->mtime);
ceph_encode_timespec64(&fc->atime, &arg->atime);
ceph_encode_timespec64(&fc->ctime, &arg->ctime);
fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq);
fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid));
fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid));
fc->mode = cpu_to_le32(arg->mode);
fc->xattr_version = cpu_to_le64(arg->xattr_version);
if (arg->xattr_buf) {
msg->middle = ceph_buffer_get(arg->xattr_buf);
fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
}
p = fc + 1;
/* flock buffer size (version 2) */
ceph_encode_32(&p, 0);
/* inline version (version 4) */
ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE);
/* inline data size */
ceph_encode_32(&p, 0);
/*
* osd_epoch_barrier (version 5)
* The epoch_barrier is protected osdc->lock, so READ_ONCE here in
* case it was recently changed
*/
ceph_encode_32(&p, READ_ONCE(osdc->epoch_barrier));
/* oldest_flush_tid (version 6) */
ceph_encode_64(&p, arg->oldest_flush_tid);
/*
* caller_uid/caller_gid (version 7)
*
* Currently, we don't properly track which caller dirtied the caps
* last, and force a flush of them when there is a conflict. For now,
* just set this to 0:0, to emulate how the MDS has worked up to now.
*/
ceph_encode_32(&p, 0);
ceph_encode_32(&p, 0);
/* pool namespace (version 8) (mds always ignores this) */
ceph_encode_32(&p, 0);
/*
* btime and change_attr (version 9)
*
* We just zero these out for now, as the MDS ignores them unless
* the requisite feature flags are set (which we don't do yet).
*/
ceph_encode_timespec64(p, &zerotime);
p += sizeof(struct ceph_timespec);
ceph_encode_64(&p, 0);
/* Advisory flags (version 10) */
ceph_encode_32(&p, arg->flags);
ceph_con_send(&arg->session->s_con, msg);
return 0;
}
/*
* Queue cap releases when an inode is dropped from our cache. Since
* inode is about to be destroyed, there is no need for i_ceph_lock.
*/
void __ceph_remove_caps(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct rb_node *p;
p = rb_first(&ci->i_caps);
while (p) {
struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
p = rb_next(p);
__ceph_remove_cap(cap, true);
}
}
/*
* Send a cap msg on the given inode. Update our caps state, then
* drop i_ceph_lock and send the message.
*
* Make note of max_size reported/requested from mds, revoked caps
* that have now been implemented.
*
* Make half-hearted attempt ot to invalidate page cache if we are
* dropping RDCACHE. Note that this will leave behind locked pages
* that we'll then need to deal with elsewhere.
*
* Return non-zero if delayed release, or we experienced an error
* such that the caller should requeue + retry later.
*
* called with i_ceph_lock, then drops it.
* caller should hold snap_rwsem (read), s_mutex.
*/
static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
int op, bool sync, int used, int want, int retain,
int flushing, u64 flush_tid, u64 oldest_flush_tid)
__releases(cap->ci->i_ceph_lock)
{
struct ceph_inode_info *ci = cap->ci;
struct inode *inode = &ci->vfs_inode;
struct cap_msg_args arg;
int held, revoking;
int wake = 0;
int delayed = 0;
int ret;
held = cap->issued | cap->implemented;
revoking = cap->implemented & ~cap->issued;
retain &= ~revoking;
dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
inode, cap, cap->session,
ceph_cap_string(held), ceph_cap_string(held & retain),
ceph_cap_string(revoking));
BUG_ON((retain & CEPH_CAP_PIN) == 0);
arg.session = cap->session;
/* don't release wanted unless we've waited a bit. */
if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
time_before(jiffies, ci->i_hold_caps_min)) {
dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
ceph_cap_string(cap->issued),
ceph_cap_string(cap->issued & retain),
ceph_cap_string(cap->mds_wanted),
ceph_cap_string(want));
want |= cap->mds_wanted;
retain |= cap->issued;
delayed = 1;
}
ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
if (want & ~cap->mds_wanted) {
/* user space may open/close single file frequently.
* This avoids droping mds_wanted immediately after
* requesting new mds_wanted.
*/
__cap_set_timeouts(mdsc, ci);
}
cap->issued &= retain; /* drop bits we don't want */
if (cap->implemented & ~cap->issued) {
/*
* Wake up any waiters on wanted -> needed transition.
* This is due to the weird transition from buffered
* to sync IO... we need to flush dirty pages _before_
* allowing sync writes to avoid reordering.
*/
wake = 1;
}
cap->implemented &= cap->issued | used;
cap->mds_wanted = want;
arg.ino = ceph_vino(inode).ino;
arg.cid = cap->cap_id;
arg.follows = flushing ? ci->i_head_snapc->seq : 0;
arg.flush_tid = flush_tid;
arg.oldest_flush_tid = oldest_flush_tid;
arg.size = inode->i_size;
ci->i_reported_size = arg.size;
arg.max_size = ci->i_wanted_max_size;
ci->i_requested_max_size = arg.max_size;
if (flushing & CEPH_CAP_XATTR_EXCL) {
__ceph_build_xattrs_blob(ci);
arg.xattr_version = ci->i_xattrs.version;
arg.xattr_buf = ci->i_xattrs.blob;
} else {
arg.xattr_buf = NULL;
}
arg.mtime = inode->i_mtime;
arg.atime = inode->i_atime;
arg.ctime = inode->i_ctime;
arg.op = op;
arg.caps = cap->implemented;
arg.wanted = want;
arg.dirty = flushing;
arg.seq = cap->seq;
arg.issue_seq = cap->issue_seq;
arg.mseq = cap->mseq;
arg.time_warp_seq = ci->i_time_warp_seq;
arg.uid = inode->i_uid;
arg.gid = inode->i_gid;
arg.mode = inode->i_mode;
arg.inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
if (list_empty(&ci->i_cap_snaps))
arg.flags = CEPH_CLIENT_CAPS_NO_CAPSNAP;
else
arg.flags = CEPH_CLIENT_CAPS_PENDING_CAPSNAP;
if (sync)
arg.flags |= CEPH_CLIENT_CAPS_SYNC;
spin_unlock(&ci->i_ceph_lock);
ret = send_cap_msg(&arg);
if (ret < 0) {
dout("error sending cap msg, must requeue %p\n", inode);
delayed = 1;
}
if (wake)
wake_up_all(&ci->i_cap_wq);
return delayed;
}
static inline int __send_flush_snap(struct inode *inode,
struct ceph_mds_session *session,
struct ceph_cap_snap *capsnap,
u32 mseq, u64 oldest_flush_tid)
{
struct cap_msg_args arg;
arg.session = session;
arg.ino = ceph_vino(inode).ino;
arg.cid = 0;
arg.follows = capsnap->follows;
arg.flush_tid = capsnap->cap_flush.tid;
arg.oldest_flush_tid = oldest_flush_tid;
arg.size = capsnap->size;
arg.max_size = 0;
arg.xattr_version = capsnap->xattr_version;
arg.xattr_buf = capsnap->xattr_blob;
arg.atime = capsnap->atime;
arg.mtime = capsnap->mtime;
arg.ctime = capsnap->ctime;
arg.op = CEPH_CAP_OP_FLUSHSNAP;
arg.caps = capsnap->issued;
arg.wanted = 0;
arg.dirty = capsnap->dirty;
arg.seq = 0;
arg.issue_seq = 0;
arg.mseq = mseq;
arg.time_warp_seq = capsnap->time_warp_seq;
arg.uid = capsnap->uid;
arg.gid = capsnap->gid;
arg.mode = capsnap->mode;
arg.inline_data = capsnap->inline_data;
arg.flags = 0;
return send_cap_msg(&arg);
}
/*
* When a snapshot is taken, clients accumulate dirty metadata on
* inodes with capabilities in ceph_cap_snaps to describe the file
* state at the time the snapshot was taken. This must be flushed
* asynchronously back to the MDS once sync writes complete and dirty
* data is written out.
*
* Called under i_ceph_lock. Takes s_mutex as needed.
*/
static void __ceph_flush_snaps(struct ceph_inode_info *ci,
struct ceph_mds_session *session)
__releases(ci->i_ceph_lock)
__acquires(ci->i_ceph_lock)
{
struct inode *inode = &ci->vfs_inode;
struct ceph_mds_client *mdsc = session->s_mdsc;
struct ceph_cap_snap *capsnap;
u64 oldest_flush_tid = 0;
u64 first_tid = 1, last_tid = 0;
dout("__flush_snaps %p session %p\n", inode, session);
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
/*
* we need to wait for sync writes to complete and for dirty
* pages to be written out.
*/
if (capsnap->dirty_pages || capsnap->writing)
break;
/* should be removed by ceph_try_drop_cap_snap() */
BUG_ON(!capsnap->need_flush);
/* only flush each capsnap once */
if (capsnap->cap_flush.tid > 0) {
dout(" already flushed %p, skipping\n", capsnap);
continue;
}
spin_lock(&mdsc->cap_dirty_lock);
capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid;
list_add_tail(&capsnap->cap_flush.g_list,
&mdsc->cap_flush_list);
if (oldest_flush_tid == 0)
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
if (list_empty(&ci->i_flushing_item)) {
list_add_tail(&ci->i_flushing_item,
&session->s_cap_flushing);
}
spin_unlock(&mdsc->cap_dirty_lock);
list_add_tail(&capsnap->cap_flush.i_list,
&ci->i_cap_flush_list);
if (first_tid == 1)
first_tid = capsnap->cap_flush.tid;
last_tid = capsnap->cap_flush.tid;
}
ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
while (first_tid <= last_tid) {
struct ceph_cap *cap = ci->i_auth_cap;
struct ceph_cap_flush *cf;
int ret;
if (!(cap && cap->session == session)) {
dout("__flush_snaps %p auth cap %p not mds%d, "
"stop\n", inode, cap, session->s_mds);
break;
}
ret = -ENOENT;
list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
if (cf->tid >= first_tid) {
ret = 0;
break;
}
}
if (ret < 0)
break;
first_tid = cf->tid + 1;
capsnap = container_of(cf, struct ceph_cap_snap, cap_flush);
refcount_inc(&capsnap->nref);
spin_unlock(&ci->i_ceph_lock);
dout("__flush_snaps %p capsnap %p tid %llu %s\n",
inode, capsnap, cf->tid, ceph_cap_string(capsnap->dirty));
ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
oldest_flush_tid);
if (ret < 0) {
pr_err("__flush_snaps: error sending cap flushsnap, "
"ino (%llx.%llx) tid %llu follows %llu\n",
ceph_vinop(inode), cf->tid, capsnap->follows);
}
ceph_put_cap_snap(capsnap);
spin_lock(&ci->i_ceph_lock);
}
}
void ceph_flush_snaps(struct ceph_inode_info *ci,
struct ceph_mds_session **psession)
{
struct inode *inode = &ci->vfs_inode;
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
struct ceph_mds_session *session = NULL;
int mds;
dout("ceph_flush_snaps %p\n", inode);
if (psession)
session = *psession;
retry:
spin_lock(&ci->i_ceph_lock);
if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) {
dout(" no capsnap needs flush, doing nothing\n");
goto out;
}
if (!ci->i_auth_cap) {
dout(" no auth cap (migrating?), doing nothing\n");
goto out;
}
mds = ci->i_auth_cap->session->s_mds;
if (session && session->s_mds != mds) {
dout(" oops, wrong session %p mutex\n", session);
mutex_unlock(&session->s_mutex);
ceph_put_mds_session(session);
session = NULL;
}
if (!session) {
spin_unlock(&ci->i_ceph_lock);
mutex_lock(&mdsc->mutex);
session = __ceph_lookup_mds_session(mdsc, mds);
mutex_unlock(&mdsc->mutex);
if (session) {
dout(" inverting session/ino locks on %p\n", session);
mutex_lock(&session->s_mutex);
}
goto retry;
}
// make sure flushsnap messages are sent in proper order.
if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
__kick_flushing_caps(mdsc, session, ci, 0);
ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
}
__ceph_flush_snaps(ci, session);
out:
spin_unlock(&ci->i_ceph_lock);
if (psession) {
*psession = session;
} else if (session) {
mutex_unlock(&session->s_mutex);
ceph_put_mds_session(session);
}
/* we flushed them all; remove this inode from the queue */
spin_lock(&mdsc->snap_flush_lock);
list_del_init(&ci->i_snap_flush_item);
spin_unlock(&mdsc->snap_flush_lock);
}
/*
* Mark caps dirty. If inode is newly dirty, return the dirty flags.
* Caller is then responsible for calling __mark_inode_dirty with the
* returned flags value.
*/
int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
struct ceph_cap_flush **pcf)
{
struct ceph_mds_client *mdsc =
ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
struct inode *inode = &ci->vfs_inode;
int was = ci->i_dirty_caps;
int dirty = 0;
if (!ci->i_auth_cap) {
pr_warn("__mark_dirty_caps %p %llx mask %s, "
"but no auth cap (session was closed?)\n",
inode, ceph_ino(inode), ceph_cap_string(mask));
return 0;
}
dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
ceph_cap_string(mask), ceph_cap_string(was),
ceph_cap_string(was | mask));
ci->i_dirty_caps |= mask;
if (was == 0) {
WARN_ON_ONCE(ci->i_prealloc_cap_flush);
swap(ci->i_prealloc_cap_flush, *pcf);
if (!ci->i_head_snapc) {
WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
ci->i_head_snapc = ceph_get_snap_context(
ci->i_snap_realm->cached_context);
}
dout(" inode %p now dirty snapc %p auth cap %p\n",
&ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
BUG_ON(!list_empty(&ci->i_dirty_item));
spin_lock(&mdsc->cap_dirty_lock);
list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
spin_unlock(&mdsc->cap_dirty_lock);
if (ci->i_flushing_caps == 0) {
ihold(inode);
dirty |= I_DIRTY_SYNC;
}
} else {
WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
}
BUG_ON(list_empty(&ci->i_dirty_item));
if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
(mask & CEPH_CAP_FILE_BUFFER))
dirty |= I_DIRTY_DATASYNC;
__cap_delay_requeue(mdsc, ci, true);
return dirty;
}
struct ceph_cap_flush *ceph_alloc_cap_flush(void)
{
return kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
}
void ceph_free_cap_flush(struct ceph_cap_flush *cf)
{
if (cf)
kmem_cache_free(ceph_cap_flush_cachep, cf);
}
static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
{
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);
return cf->tid;
}
return 0;
}
/*
* Remove cap_flush from the mdsc's or inode's flushing cap list.
* Return true if caller needs to wake up flush waiters.
*/
static bool __finish_cap_flush(struct ceph_mds_client *mdsc,
struct ceph_inode_info *ci,
struct ceph_cap_flush *cf)
{
struct ceph_cap_flush *prev;
bool wake = cf->wake;
if (mdsc) {
/* are there older pending cap flushes? */
if (wake && cf->g_list.prev != &mdsc->cap_flush_list) {
prev = list_prev_entry(cf, g_list);
prev->wake = true;
wake = false;
}
list_del(&cf->g_list);
} else if (ci) {
if (wake && cf->i_list.prev != &ci->i_cap_flush_list) {
prev = list_prev_entry(cf, i_list);
prev->wake = true;
wake = false;
}
list_del(&cf->i_list);
} else {
BUG_ON(1);
}
return wake;
}
/*
* Add dirty inode to the flushing list. Assigned a seq number so we
* can wait for caps to flush without starving.
*
* Called under i_ceph_lock.
*/
static int __mark_caps_flushing(struct inode *inode,
struct ceph_mds_session *session, bool wake,
u64 *flush_tid, u64 *oldest_flush_tid)
{
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_cap_flush *cf = NULL;
int flushing;
BUG_ON(ci->i_dirty_caps == 0);
BUG_ON(list_empty(&ci->i_dirty_item));
BUG_ON(!ci->i_prealloc_cap_flush);
flushing = ci->i_dirty_caps;
dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
ceph_cap_string(flushing),
ceph_cap_string(ci->i_flushing_caps),
ceph_cap_string(ci->i_flushing_caps | flushing));
ci->i_flushing_caps |= flushing;
ci->i_dirty_caps = 0;
dout(" inode %p now !dirty\n", inode);
swap(cf, ci->i_prealloc_cap_flush);
cf->caps = flushing;
cf->wake = wake;
spin_lock(&mdsc->cap_dirty_lock);
list_del_init(&ci->i_dirty_item);
cf->tid = ++mdsc->last_cap_flush_tid;
list_add_tail(&cf->g_list, &mdsc->cap_flush_list);
*oldest_flush_tid = __get_oldest_flush_tid(mdsc);
if (list_empty(&ci->i_flushing_item)) {
list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
mdsc->num_cap_flushing++;
}
spin_unlock(&mdsc->cap_dirty_lock);
list_add_tail(&cf->i_list, &ci->i_cap_flush_list);
*flush_tid = cf->tid;
return flushing;
}
/*
* try to invalidate mapping pages without blocking.
*/
static int try_nonblocking_invalidate(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
u32 invalidating_gen = ci->i_rdcache_gen;
spin_unlock(&ci->i_ceph_lock);
invalidate_mapping_pages(&inode->i_data, 0, -1);
spin_lock(&ci->i_ceph_lock);
if (inode->i_data.nrpages == 0 &&
invalidating_gen == ci->i_rdcache_gen) {
/* success. */
dout("try_nonblocking_invalidate %p success\n", inode);
/* save any racing async invalidate some trouble */
ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
return 0;
}
dout("try_nonblocking_invalidate %p failed\n", inode);
return -1;
}
bool __ceph_should_report_size(struct ceph_inode_info *ci)
{
loff_t size = ci->vfs_inode.i_size;
/* mds will adjust max size according to the reported size */
if (ci->i_flushing_caps & CEPH_CAP_FILE_WR)
return false;
if (size >= ci->i_max_size)
return true;
/* half of previous max_size increment has been used */
if (ci->i_max_size > ci->i_reported_size &&
(size << 1) >= ci->i_max_size + ci->i_reported_size)
return true;
return false;
}
/*
* Swiss army knife function to examine currently used and wanted
* versus held caps. Release, flush, ack revoked caps to mds as
* appropriate.
*
* CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
* cap release further.
* CHECK_CAPS_AUTHONLY - we should only check the auth cap
* CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
* further delay.
*/
void ceph_check_caps(struct ceph_inode_info *ci, int flags,
struct ceph_mds_session *session)
{
struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
struct ceph_mds_client *mdsc = fsc->mdsc;
struct inode *inode = &ci->vfs_inode;
struct ceph_cap *cap;
u64 flush_tid, oldest_flush_tid;
int file_wanted, used, cap_used;
int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
int issued, implemented, want, retain, revoking, flushing = 0;
int mds = -1; /* keep track of how far we've gone through i_caps list
to avoid an infinite loop on retry */
struct rb_node *p;
int delayed = 0, sent = 0;
bool no_delay = flags & CHECK_CAPS_NODELAY;
bool queue_invalidate = false;
bool tried_invalidate = false;
/* if we are unmounting, flush any unused caps immediately. */
if (mdsc->stopping)
no_delay = true;
spin_lock(&ci->i_ceph_lock);
if (ci->i_ceph_flags & CEPH_I_FLUSH)
flags |= CHECK_CAPS_FLUSH;
if (!(flags & CHECK_CAPS_AUTHONLY) ||
(ci->i_auth_cap && __ceph_is_single_caps(ci)))
__cap_delay_cancel(mdsc, ci);
goto retry_locked;
retry:
spin_lock(&ci->i_ceph_lock);
retry_locked:
file_wanted = __ceph_caps_file_wanted(ci);
used = __ceph_caps_used(ci);
issued = __ceph_caps_issued(ci, &implemented);
revoking = implemented & ~issued;
want = file_wanted;
retain = file_wanted | used | CEPH_CAP_PIN;
if (!mdsc->stopping && inode->i_nlink > 0) {
if (file_wanted) {
retain |= CEPH_CAP_ANY; /* be greedy */
} else if (S_ISDIR(inode->i_mode) &&
(issued & CEPH_CAP_FILE_SHARED) &&
__ceph_dir_is_complete(ci)) {
/*
* If a directory is complete, we want to keep
* the exclusive cap. So that MDS does not end up
* revoking the shared cap on every create/unlink
* operation.
*/
if (IS_RDONLY(inode))
want = CEPH_CAP_ANY_SHARED;
else
want = CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
retain |= want;
} else {
retain |= CEPH_CAP_ANY_SHARED;
/*
* keep RD only if we didn't have the file open RW,
* because then the mds would revoke it anyway to
* journal max_size=0.
*/
if (ci->i_max_size == 0)
retain |= CEPH_CAP_ANY_RD;
}
}
dout("check_caps %p file_want %s used %s dirty %s flushing %s"
" issued %s revoking %s retain %s %s%s%s\n", inode,
ceph_cap_string(file_wanted),
ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
ceph_cap_string(ci->i_flushing_caps),
ceph_cap_string(issued), ceph_cap_string(revoking),
ceph_cap_string(retain),
(flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
(flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
(flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
/*
* If we no longer need to hold onto old our caps, and we may
* have cached pages, but don't want them, then try to invalidate.
* If we fail, it's because pages are locked.... try again later.
*/
if ((!no_delay || mdsc->stopping) &&
!S_ISDIR(inode->i_mode) && /* ignore readdir cache */
!(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */
inode->i_data.nrpages && /* have cached pages */
(revoking & (CEPH_CAP_FILE_CACHE|
CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
!tried_invalidate) {
dout("check_caps trying to invalidate on %p\n", inode);
if (try_nonblocking_invalidate(inode) < 0) {
dout("check_caps queuing invalidate\n");
queue_invalidate = true;
ci->i_rdcache_revoking = ci->i_rdcache_gen;
}
tried_invalidate = true;
goto retry_locked;
}
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
cap = rb_entry(p, struct ceph_cap, ci_node);
/* avoid looping forever */
if (mds >= cap->mds ||
((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
continue;
/* NOTE: no side-effects allowed, until we take s_mutex */
cap_used = used;
if (ci->i_auth_cap && cap != ci->i_auth_cap)
cap_used &= ~ci->i_auth_cap->issued;
revoking = cap->implemented & ~cap->issued;
dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
cap->mds, cap, ceph_cap_string(cap_used),
ceph_cap_string(cap->issued),
ceph_cap_string(cap->implemented),
ceph_cap_string(revoking));
if (cap == ci->i_auth_cap &&
(cap->issued & CEPH_CAP_FILE_WR)) {
/* request larger max_size from MDS? */
if (ci->i_wanted_max_size > ci->i_max_size &&
ci->i_wanted_max_size > ci->i_requested_max_size) {
dout("requesting new max_size\n");
goto ack;
}
/* approaching file_max? */
if (__ceph_should_report_size(ci)) {
dout("i_size approaching max_size\n");
goto ack;
}
}
/* flush anything dirty? */
if (cap == ci->i_auth_cap) {
if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {
dout("flushing dirty caps\n");
goto ack;
}
if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
dout("flushing snap caps\n");
goto ack;
}
}
/* completed revocation? going down and there are no caps? */
if (revoking && (revoking & cap_used) == 0) {
dout("completed revocation of %s\n",
ceph_cap_string(cap->implemented & ~cap->issued));
goto ack;
}
/* want more caps from mds? */
if (want & ~(cap->mds_wanted | cap->issued))
goto ack;
/* things we might delay */
if ((cap->issued & ~retain) == 0)
continue; /* nope, all good */
if (no_delay)
goto ack;
/* delay? */
if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
time_before(jiffies, ci->i_hold_caps_max)) {
dout(" delaying issued %s -> %s, wanted %s -> %s\n",
ceph_cap_string(cap->issued),
ceph_cap_string(cap->issued & retain),
ceph_cap_string(cap->mds_wanted),
ceph_cap_string(want));
delayed++;
continue;
}
ack:
if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
dout(" skipping %p I_NOFLUSH set\n", inode);
continue;
}
if (session && session != cap->session) {
dout("oops, wrong session %p mutex\n", session);
mutex_unlock(&session->s_mutex);
session = NULL;
}
if (!session) {
session = cap->session;
if (mutex_trylock(&session->s_mutex) == 0) {
dout("inverting session/ino locks on %p\n",
session);
spin_unlock(&ci->i_ceph_lock);
if (took_snap_rwsem) {
up_read(&mdsc->snap_rwsem);
took_snap_rwsem = 0;
}
mutex_lock(&session->s_mutex);
goto retry;
}
}
/* kick flushing and flush snaps before sending normal
* cap message */
if (cap == ci->i_auth_cap &&
(ci->i_ceph_flags &
(CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {
if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
__kick_flushing_caps(mdsc, session, ci, 0);
ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
}
if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
__ceph_flush_snaps(ci, session);
goto retry_locked;
}
/* take snap_rwsem after session mutex */
if (!took_snap_rwsem) {
if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
dout("inverting snap/in locks on %p\n",
inode);
spin_unlock(&ci->i_ceph_lock);
down_read(&mdsc->snap_rwsem);
took_snap_rwsem = 1;
goto retry;
}
took_snap_rwsem = 1;
}
if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
flushing = __mark_caps_flushing(inode, session, false,
&flush_tid,
&oldest_flush_tid);
} else {
flushing = 0;
flush_tid = 0;
spin_lock(&mdsc->cap_dirty_lock);
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
spin_unlock(&mdsc->cap_dirty_lock);
}
mds = cap->mds; /* remember mds, so we don't repeat */
sent++;
/* __send_cap drops i_ceph_lock */
delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, false,
cap_used, want, retain, flushing,
flush_tid, oldest_flush_tid);
goto retry; /* retake i_ceph_lock and restart our cap scan. */
}
/* Reschedule delayed caps release if we delayed anything */
if (delayed)
__cap_delay_requeue(mdsc, ci, false);
spin_unlock(&ci->i_ceph_lock);
if (queue_invalidate)
ceph_queue_invalidate(inode);
if (session)
mutex_unlock(&session->s_mutex);
if (took_snap_rwsem)
up_read(&mdsc->snap_rwsem);
}
/*
* Try to flush dirty caps back to the auth mds.
*/
static int try_flush_caps(struct inode *inode, u64 *ptid)
{
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_session *session = NULL;
int flushing = 0;
u64 flush_tid = 0, oldest_flush_tid = 0;
retry:
spin_lock(&ci->i_ceph_lock);
if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
spin_unlock(&ci->i_ceph_lock);
dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
goto out;
}
if (ci->i_dirty_caps && ci->i_auth_cap) {
struct ceph_cap *cap = ci->i_auth_cap;
int used = __ceph_caps_used(ci);
int want = __ceph_caps_wanted(ci);
int delayed;
if (!session || session != cap->session) {
spin_unlock(&ci->i_ceph_lock);
if (session)
mutex_unlock(&session->s_mutex);
session = cap->session;
mutex_lock(&session->s_mutex);
goto retry;
}
if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) {
spin_unlock(&ci->i_ceph_lock);
goto out;
}
flushing = __mark_caps_flushing(inode, session, true,
&flush_tid, &oldest_flush_tid);
/* __send_cap drops i_ceph_lock */
delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, true,
used, want, (cap->issued | cap->implemented),
flushing, flush_tid, oldest_flush_tid);
if (delayed) {
spin_lock(&ci->i_ceph_lock);
__cap_delay_requeue(mdsc, ci, true);
spin_unlock(&ci->i_ceph_lock);
}
} else {
if (!list_empty(&ci->i_cap_flush_list)) {
struct ceph_cap_flush *cf =
list_last_entry(&ci->i_cap_flush_list,
struct ceph_cap_flush, i_list);
cf->wake = true;
flush_tid = cf->tid;
}
flushing = ci->i_flushing_caps;
spin_unlock(&ci->i_ceph_lock);
}
out:
if (session)
mutex_unlock(&session->s_mutex);
*ptid = flush_tid;
return flushing;
}
/*
* Return true if we've flushed caps through the given flush_tid.
*/
static int caps_are_flushed(struct inode *inode, u64 flush_tid)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int ret = 1;
spin_lock(&ci->i_ceph_lock);
if (!list_empty(&ci->i_cap_flush_list)) {
struct ceph_cap_flush * cf =
list_first_entry(&ci->i_cap_flush_list,
struct ceph_cap_flush, i_list);
if (cf->tid <= flush_tid)
ret = 0;
}
spin_unlock(&ci->i_ceph_lock);
return ret;
}
/*
* wait for any unsafe requests to complete.
*/
static int unsafe_request_wait(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_request *req1 = NULL, *req2 = NULL;
int ret, err = 0;
spin_lock(&ci->i_unsafe_lock);
if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
req1 = list_last_entry(&ci->i_unsafe_dirops,
struct ceph_mds_request,
r_unsafe_dir_item);
ceph_mdsc_get_request(req1);
}
if (!list_empty(&ci->i_unsafe_iops)) {
req2 = list_last_entry(&ci->i_unsafe_iops,
struct ceph_mds_request,
r_unsafe_target_item);
ceph_mdsc_get_request(req2);
}
spin_unlock(&ci->i_unsafe_lock);
dout("unsafe_request_wait %p wait on tid %llu %llu\n",
inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
if (req1) {
ret = !wait_for_completion_timeout(&req1->r_safe_completion,
ceph_timeout_jiffies(req1->r_timeout));
if (ret)
err = -EIO;
ceph_mdsc_put_request(req1);
}
if (req2) {
ret = !wait_for_completion_timeout(&req2->r_safe_completion,
ceph_timeout_jiffies(req2->r_timeout));
if (ret)
err = -EIO;
ceph_mdsc_put_request(req2);
}
return err;
}
int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
struct inode *inode = file->f_mapping->host;
struct ceph_inode_info *ci = ceph_inode(inode);
u64 flush_tid;
int ret;
int dirty;
dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
ret = file_write_and_wait_range(file, start, end);
if (ret < 0)
goto out;
if (datasync)
goto out;
inode_lock(inode);
dirty = try_flush_caps(inode, &flush_tid);
dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
ret = unsafe_request_wait(inode);
/*
* only wait on non-file metadata writeback (the mds
* can recover size and mtime, so we don't need to
* wait for that)
*/
if (!ret && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
ret = wait_event_interruptible(ci->i_cap_wq,
caps_are_flushed(inode, flush_tid));
}
inode_unlock(inode);
out:
dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret);
return ret;
}
/*
* Flush any dirty caps back to the mds. If we aren't asked to wait,
* queue inode for flush but don't do so immediately, because we can
* get by with fewer MDS messages if we wait for data writeback to
* complete first.
*/
int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
{
struct ceph_inode_info *ci = ceph_inode(inode);
u64 flush_tid;
int err = 0;
int dirty;
int wait = (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync);
dout("write_inode %p wait=%d\n", inode, wait);
if (wait) {
dirty = try_flush_caps(inode, &flush_tid);
if (dirty)
err = wait_event_interruptible(ci->i_cap_wq,
caps_are_flushed(inode, flush_tid));
} else {
struct ceph_mds_client *mdsc =
ceph_sb_to_client(inode->i_sb)->mdsc;
spin_lock(&ci->i_ceph_lock);
if (__ceph_caps_dirty(ci))
__cap_delay_requeue_front(mdsc, ci);
spin_unlock(&ci->i_ceph_lock);
}
return err;
}
static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
struct ceph_inode_info *ci,
u64 oldest_flush_tid)
__releases(ci->i_ceph_lock)
__acquires(ci->i_ceph_lock)
{
struct inode *inode = &ci->vfs_inode;
struct ceph_cap *cap;
struct ceph_cap_flush *cf;
int ret;
u64 first_tid = 0;
list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
if (cf->tid < first_tid)
continue;
cap = ci->i_auth_cap;
if (!(cap && cap->session == session)) {
pr_err("%p auth cap %p not mds%d ???\n",
inode, cap, session->s_mds);
break;
}
first_tid = cf->tid + 1;
if (cf->caps) {
dout("kick_flushing_caps %p cap %p tid %llu %s\n",
inode, cap, cf->tid, ceph_cap_string(cf->caps));
ci->i_ceph_flags |= CEPH_I_NODELAY;
ret = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
false, __ceph_caps_used(ci),
__ceph_caps_wanted(ci),
cap->issued | cap->implemented,
cf->caps, cf->tid, oldest_flush_tid);
if (ret) {
pr_err("kick_flushing_caps: error sending "
"cap flush, ino (%llx.%llx) "
"tid %llu flushing %s\n",
ceph_vinop(inode), cf->tid,
ceph_cap_string(cf->caps));
}
} else {
struct ceph_cap_snap *capsnap =
container_of(cf, struct ceph_cap_snap,
cap_flush);
dout("kick_flushing_caps %p capsnap %p tid %llu %s\n",
inode, capsnap, cf->tid,
ceph_cap_string(capsnap->dirty));
refcount_inc(&capsnap->nref);
spin_unlock(&ci->i_ceph_lock);
ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
oldest_flush_tid);
if (ret < 0) {
pr_err("kick_flushing_caps: error sending "
"cap flushsnap, ino (%llx.%llx) "
"tid %llu follows %llu\n",
ceph_vinop(inode), cf->tid,
capsnap->follows);
}
ceph_put_cap_snap(capsnap);
}
spin_lock(&ci->i_ceph_lock);
}
}
void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_inode_info *ci;
struct ceph_cap *cap;
u64 oldest_flush_tid;
dout("early_kick_flushing_caps mds%d\n", session->s_mds);
spin_lock(&mdsc->cap_dirty_lock);
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
spin_unlock(&mdsc->cap_dirty_lock);
list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
spin_lock(&ci->i_ceph_lock);
cap = ci->i_auth_cap;
if (!(cap && cap->session == session)) {
pr_err("%p auth cap %p not mds%d ???\n",
&ci->vfs_inode, cap, session->s_mds);
spin_unlock(&ci->i_ceph_lock);
continue;
}
/*
* if flushing caps were revoked, we re-send the cap flush
* in client reconnect stage. This guarantees MDS * processes
* the cap flush message before issuing the flushing caps to
* other client.
*/
if ((cap->issued & ci->i_flushing_caps) !=
ci->i_flushing_caps) {
ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
/* encode_caps_cb() also will reset these sequence
* numbers. make sure sequence numbers in cap flush
* message match later reconnect message */
cap->seq = 0;
cap->issue_seq = 0;
cap->mseq = 0;
__kick_flushing_caps(mdsc, session, ci,
oldest_flush_tid);
} else {
ci->i_ceph_flags |= CEPH_I_KICK_FLUSH;
}
spin_unlock(&ci->i_ceph_lock);
}
}
void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_inode_info *ci;
struct ceph_cap *cap;
u64 oldest_flush_tid;
dout("kick_flushing_caps mds%d\n", session->s_mds);
spin_lock(&mdsc->cap_dirty_lock);
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
spin_unlock(&mdsc->cap_dirty_lock);
list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
spin_lock(&ci->i_ceph_lock);
cap = ci->i_auth_cap;
if (!(cap && cap->session == session)) {
pr_err("%p auth cap %p not mds%d ???\n",
&ci->vfs_inode, cap, session->s_mds);
spin_unlock(&ci->i_ceph_lock);
continue;
}
if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
__kick_flushing_caps(mdsc, session, ci,
oldest_flush_tid);
}
spin_unlock(&ci->i_ceph_lock);
}
}
static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
struct inode *inode)
__releases(ci->i_ceph_lock)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_cap *cap;
cap = ci->i_auth_cap;
dout("kick_flushing_inode_caps %p flushing %s\n", inode,
ceph_cap_string(ci->i_flushing_caps));
if (!list_empty(&ci->i_cap_flush_list)) {
u64 oldest_flush_tid;
spin_lock(&mdsc->cap_dirty_lock);
list_move_tail(&ci->i_flushing_item,
&cap->session->s_cap_flushing);
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
spin_unlock(&mdsc->cap_dirty_lock);
ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
__kick_flushing_caps(mdsc, session, ci, oldest_flush_tid);
spin_unlock(&ci->i_ceph_lock);
} else {
spin_unlock(&ci->i_ceph_lock);
}
}
/*
* Take references to capabilities we hold, so that we don't release
* them to the MDS prematurely.
*
* Protected by i_ceph_lock.
*/
static void __take_cap_refs(struct ceph_inode_info *ci, int got,
bool snap_rwsem_locked)
{
if (got & CEPH_CAP_PIN)
ci->i_pin_ref++;
if (got & CEPH_CAP_FILE_RD)
ci->i_rd_ref++;
if (got & CEPH_CAP_FILE_CACHE)
ci->i_rdcache_ref++;
if (got & CEPH_CAP_FILE_WR) {
if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
BUG_ON(!snap_rwsem_locked);
ci->i_head_snapc = ceph_get_snap_context(
ci->i_snap_realm->cached_context);
}
ci->i_wr_ref++;
}
if (got & CEPH_CAP_FILE_BUFFER) {
if (ci->i_wb_ref == 0)
ihold(&ci->vfs_inode);
ci->i_wb_ref++;
dout("__take_cap_refs %p wb %d -> %d (?)\n",
&ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
}
}
/*
* Try to grab cap references. Specify those refs we @want, and the
* minimal set we @need. Also include the larger offset we are writing
* to (when applicable), and check against max_size here as well.
* Note that caller is responsible for ensuring max_size increases are
* requested from the MDS.
*/
static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
loff_t endoff, bool nonblock, int *got, int *err)
{
struct inode *inode = &ci->vfs_inode;
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
int ret = 0;
int have, implemented;
int file_wanted;
bool snap_rwsem_locked = false;
dout("get_cap_refs %p need %s want %s\n", inode,
ceph_cap_string(need), ceph_cap_string(want));
again:
spin_lock(&ci->i_ceph_lock);
/* make sure file is actually open */
file_wanted = __ceph_caps_file_wanted(ci);
if ((file_wanted & need) != need) {
dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
ceph_cap_string(need), ceph_cap_string(file_wanted));
*err = -EBADF;
ret = 1;
goto out_unlock;
}
/* finish pending truncate */
while (ci->i_truncate_pending) {
spin_unlock(&ci->i_ceph_lock);
if (snap_rwsem_locked) {
up_read(&mdsc->snap_rwsem);
snap_rwsem_locked = false;
}
__ceph_do_pending_vmtruncate(inode);
spin_lock(&ci->i_ceph_lock);
}
have = __ceph_caps_issued(ci, &implemented);
if (have & need & CEPH_CAP_FILE_WR) {
if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
inode, endoff, ci->i_max_size);
if (endoff > ci->i_requested_max_size) {
*err = -EAGAIN;
ret = 1;
}
goto out_unlock;
}
/*
* If a sync write is in progress, we must wait, so that we
* can get a final snapshot value for size+mtime.
*/
if (__ceph_have_pending_cap_snap(ci)) {
dout("get_cap_refs %p cap_snap_pending\n", inode);
goto out_unlock;
}
}
if ((have & need) == need) {
/*
* Look at (implemented & ~have & not) so that we keep waiting
* on transition from wanted -> needed caps. This is needed
* for WRBUFFER|WR -> WR to avoid a new WR sync write from
* going before a prior buffered writeback happens.
*/
int not = want & ~(have & need);
int revoking = implemented & ~have;
dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
inode, ceph_cap_string(have), ceph_cap_string(not),
ceph_cap_string(revoking));
if ((revoking & not) == 0) {
if (!snap_rwsem_locked &&
!ci->i_head_snapc &&
(need & CEPH_CAP_FILE_WR)) {
if (!down_read_trylock(&mdsc->snap_rwsem)) {
/*
* we can not call down_read() when
* task isn't in TASK_RUNNING state
*/
if (nonblock) {
*err = -EAGAIN;
ret = 1;
goto out_unlock;
}
spin_unlock(&ci->i_ceph_lock);
down_read(&mdsc->snap_rwsem);
snap_rwsem_locked = true;
goto again;
}
snap_rwsem_locked = true;
}
*got = need | (have & want);
if ((need & CEPH_CAP_FILE_RD) &&
!(*got & CEPH_CAP_FILE_CACHE))
ceph_disable_fscache_readpage(ci);
__take_cap_refs(ci, *got, true);
ret = 1;
}
} else {
int session_readonly = false;
if ((need & CEPH_CAP_FILE_WR) && ci->i_auth_cap) {
struct ceph_mds_session *s = ci->i_auth_cap->session;
spin_lock(&s->s_cap_lock);
session_readonly = s->s_readonly;
spin_unlock(&s->s_cap_lock);
}
if (session_readonly) {
dout("get_cap_refs %p needed %s but mds%d readonly\n",
inode, ceph_cap_string(need), ci->i_auth_cap->mds);
*err = -EROFS;
ret = 1;
goto out_unlock;
}
if (ci->i_ceph_flags & CEPH_I_CAP_DROPPED) {
int mds_wanted;
if (READ_ONCE(mdsc->fsc->mount_state) ==
CEPH_MOUNT_SHUTDOWN) {
dout("get_cap_refs %p forced umount\n", inode);
*err = -EIO;
ret = 1;
goto out_unlock;
}
mds_wanted = __ceph_caps_mds_wanted(ci, false);
if (need & ~(mds_wanted & need)) {
dout("get_cap_refs %p caps were dropped"
" (session killed?)\n", inode);
*err = -ESTALE;
ret = 1;
goto out_unlock;
}
if (!(file_wanted & ~mds_wanted))
ci->i_ceph_flags &= ~CEPH_I_CAP_DROPPED;
}
dout("get_cap_refs %p have %s needed %s\n", inode,
ceph_cap_string(have), ceph_cap_string(need));
}
out_unlock:
spin_unlock(&ci->i_ceph_lock);
if (snap_rwsem_locked)
up_read(&mdsc->snap_rwsem);
dout("get_cap_refs %p ret %d got %s\n", inode,
ret, ceph_cap_string(*got));
return ret;
}
/*
* Check the offset we are writing up to against our current
* max_size. If necessary, tell the MDS we want to write to
* a larger offset.
*/
static void check_max_size(struct inode *inode, loff_t endoff)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int check = 0;
/* do we need to explicitly request a larger max_size? */
spin_lock(&ci->i_ceph_lock);
if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
dout("write %p at large endoff %llu, req max_size\n",
inode, endoff);
ci->i_wanted_max_size = endoff;
}
/* duplicate ceph_check_caps()'s logic */
if (ci->i_auth_cap &&
(ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
ci->i_wanted_max_size > ci->i_max_size &&
ci->i_wanted_max_size > ci->i_requested_max_size)
check = 1;
spin_unlock(&ci->i_ceph_lock);
if (check)
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
}
int ceph_try_get_caps(struct ceph_inode_info *ci, int need, int want,
bool nonblock, int *got)
{
int ret, err = 0;
BUG_ON(need & ~CEPH_CAP_FILE_RD);
BUG_ON(want & ~(CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO|CEPH_CAP_FILE_SHARED));