blob: 6fe0ad26a7dfc0430da9e9e0fca8c312a4b2bdc0 [file] [log] [blame]
#include <linux/ceph/ceph_debug.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/sched.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.
*/
/*
* 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_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_min_caps(struct ceph_mds_client *mdsc, int delta)
{
spin_lock(&mdsc->caps_list_lock);
mdsc->caps_min_count += delta;
BUG_ON(mdsc->caps_min_count < 0);
spin_unlock(&mdsc->caps_list_lock);
}
void ceph_reserve_caps(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx, int need)
{
int i;
struct ceph_cap *cap;
int have;
int alloc = 0;
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; i++) {
cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
if (!cap)
break;
list_add(&cap->caps_item, &newcaps);
alloc++;
}
/* we didn't manage to reserve as much as we needed */
if (have + alloc != need)
pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
ctx, need, have + alloc);
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);
spin_unlock(&mdsc->caps_list_lock);
ctx->count = need;
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);
}
int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx)
{
dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
if (ctx->count) {
spin_lock(&mdsc->caps_list_lock);
BUG_ON(mdsc->caps_reserve_count < ctx->count);
mdsc->caps_reserve_count -= ctx->count;
mdsc->caps_avail_count += ctx->count;
ctx->count = 0;
dout("unreserve caps %d = %d used + %d resv + %d avail\n",
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);
spin_unlock(&mdsc->caps_list_lock);
}
return 0;
}
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);
}
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--;
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;
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;
}
/*
* 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 *ma = mdsc->fsc->mount_options;
ci->i_hold_caps_min = round_jiffies(jiffies +
ma->caps_wanted_delay_min * HZ);
ci->i_hold_caps_max = round_jiffies(jiffies +
ma->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)
{
__cap_set_timeouts(mdsc, ci);
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);
}
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 we are newly issued FILE_SHARED, mark dir not complete; we
* don't know what happened to this directory while we didn't
* have the cap.
*/
if ((issued & CEPH_CAP_FILE_SHARED) &&
(had & CEPH_CAP_FILE_SHARED) == 0) {
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 {
/*
* 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) {
/*
* add this inode to the appropriate snap realm
*/
struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
realmino);
if (realm) {
spin_lock(&realm->inodes_with_caps_lock);
ci->i_snap_realm = realm;
list_add(&ci->i_snap_realm_item,
&realm->inodes_with_caps);
spin_unlock(&realm->inodes_with_caps_lock);
} 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);
}
if (flags & CEPH_CAP_FLAG_AUTH) {
if (ci->i_auth_cap == NULL ||
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 == NULL) {
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 want = 0;
int mode;
for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
if (ci->i_nr_by_mode[mode])
want |= ceph_caps_for_mode(mode);
return want;
}
/*
* Return caps we have registered with the MDS(s) as 'wanted'.
*/
int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
{
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 (!__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_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;
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) {
list_add_tail(&cap->session_caps,
&session->s_cap_releases);
session->s_num_cap_releases++;
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);
}
/*
* Build and send a cap message to the given MDS.
*
* Caller should be holding s_mutex.
*/
static int send_cap_msg(struct ceph_mds_session *session,
u64 ino, u64 cid, int op,
int caps, int wanted, int dirty,
u32 seq, u64 flush_tid, u64 oldest_flush_tid,
u32 issue_seq, u32 mseq, u64 size, u64 max_size,
struct timespec *mtime, struct timespec *atime,
u64 time_warp_seq,
kuid_t uid, kgid_t gid, umode_t mode,
u64 xattr_version,
struct ceph_buffer *xattrs_buf,
u64 follows, bool inline_data)
{
struct ceph_mds_caps *fc;
struct ceph_msg *msg;
void *p;
size_t extra_len;
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(op),
cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
ceph_cap_string(dirty),
seq, issue_seq, flush_tid, oldest_flush_tid,
mseq, follows, size, max_size,
xattr_version, xattrs_buf ? (int)xattrs_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;
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(6);
msg->hdr.tid = cpu_to_le64(flush_tid);
fc = msg->front.iov_base;
memset(fc, 0, sizeof(*fc));
fc->cap_id = cpu_to_le64(cid);
fc->op = cpu_to_le32(op);
fc->seq = cpu_to_le32(seq);
fc->issue_seq = cpu_to_le32(issue_seq);
fc->migrate_seq = cpu_to_le32(mseq);
fc->caps = cpu_to_le32(caps);
fc->wanted = cpu_to_le32(wanted);
fc->dirty = cpu_to_le32(dirty);
fc->ino = cpu_to_le64(ino);
fc->snap_follows = cpu_to_le64(follows);
fc->size = cpu_to_le64(size);
fc->max_size = cpu_to_le64(max_size);
if (mtime)
ceph_encode_timespec(&fc->mtime, mtime);
if (atime)
ceph_encode_timespec(&fc->atime, atime);
fc->time_warp_seq = cpu_to_le32(time_warp_seq);
fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid));
fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
fc->mode = cpu_to_le32(mode);
p = fc + 1;
/* flock buffer size */
ceph_encode_32(&p, 0);
/* inline version */
ceph_encode_64(&p, inline_data ? 0 : CEPH_INLINE_NONE);
/* inline data size */
ceph_encode_32(&p, 0);
/* osd_epoch_barrier */
ceph_encode_32(&p, 0);
/* oldest_flush_tid */
ceph_encode_64(&p, oldest_flush_tid);
fc->xattr_version = cpu_to_le64(xattr_version);
if (xattrs_buf) {
msg->middle = ceph_buffer_get(xattrs_buf);
fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
}
ceph_con_send(&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_queue_caps_release(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, 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;
u64 cap_id = cap->cap_id;
int held, revoking, dropping, keep;
u64 seq, issue_seq, mseq, time_warp_seq, follows;
u64 size, max_size;
struct timespec mtime, atime;
int wake = 0;
umode_t mode;
kuid_t uid;
kgid_t gid;
struct ceph_mds_session *session;
u64 xattr_version = 0;
struct ceph_buffer *xattr_blob = NULL;
int delayed = 0;
int ret;
bool inline_data;
held = cap->issued | cap->implemented;
revoking = cap->implemented & ~cap->issued;
retain &= ~revoking;
dropping = cap->issued & ~retain;
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);
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);
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;
follows = flushing ? ci->i_head_snapc->seq : 0;
keep = cap->implemented;
seq = cap->seq;
issue_seq = cap->issue_seq;
mseq = cap->mseq;
size = inode->i_size;
ci->i_reported_size = size;
max_size = ci->i_wanted_max_size;
ci->i_requested_max_size = max_size;
mtime = inode->i_mtime;
atime = inode->i_atime;
time_warp_seq = ci->i_time_warp_seq;
uid = inode->i_uid;
gid = inode->i_gid;
mode = inode->i_mode;
if (flushing & CEPH_CAP_XATTR_EXCL) {
__ceph_build_xattrs_blob(ci);
xattr_blob = ci->i_xattrs.blob;
xattr_version = ci->i_xattrs.version;
}
inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
spin_unlock(&ci->i_ceph_lock);
ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
op, keep, want, flushing, seq,
flush_tid, oldest_flush_tid, issue_seq, mseq,
size, max_size, &mtime, &atime, time_warp_seq,
uid, gid, mode, xattr_version, xattr_blob,
follows, inline_data);
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;
}
/*
* 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.
*
* Unless @kick is true, skip cap_snaps that were already sent to
* the MDS (i.e., during this session).
*
* Called under i_ceph_lock. Takes s_mutex as needed.
*/
void __ceph_flush_snaps(struct ceph_inode_info *ci,
struct ceph_mds_session **psession,
int kick)
__releases(ci->i_ceph_lock)
__acquires(ci->i_ceph_lock)
{
struct inode *inode = &ci->vfs_inode;
int mds;
struct ceph_cap_snap *capsnap;
u32 mseq;
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
session->s_mutex */
u64 next_follows = 0; /* keep track of how far we've gotten through the
i_cap_snaps list, and skip these entries next time
around to avoid an infinite loop */
if (psession)
session = *psession;
dout("__flush_snaps %p\n", inode);
retry:
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
/* avoid an infiniute loop after retry */
if (capsnap->follows < next_follows)
continue;
/*
* 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);
/* pick mds, take s_mutex */
if (ci->i_auth_cap == NULL) {
dout("no auth cap (migrating?), doing nothing\n");
goto out;
}
/* only flush each capsnap once */
if (!kick && !list_empty(&capsnap->flushing_item)) {
dout("already flushed %p, skipping\n", capsnap);
continue;
}
mds = ci->i_auth_cap->session->s_mds;
mseq = ci->i_auth_cap->mseq;
if (session && session->s_mds != mds) {
dout("oops, wrong session %p mutex\n", session);
if (kick)
goto out;
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);
}
/*
* if session == NULL, we raced against a cap
* deletion or migration. retry, and we'll
* get a better @mds value next time.
*/
spin_lock(&ci->i_ceph_lock);
goto retry;
}
spin_lock(&mdsc->cap_dirty_lock);
capsnap->flush_tid = ++mdsc->last_cap_flush_tid;
spin_unlock(&mdsc->cap_dirty_lock);
atomic_inc(&capsnap->nref);
if (list_empty(&capsnap->flushing_item))
list_add_tail(&capsnap->flushing_item,
&session->s_cap_snaps_flushing);
spin_unlock(&ci->i_ceph_lock);
dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
inode, capsnap, capsnap->follows, capsnap->flush_tid);
send_cap_msg(session, ceph_vino(inode).ino, 0,
CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
capsnap->dirty, 0, capsnap->flush_tid, 0,
0, mseq, capsnap->size, 0,
&capsnap->mtime, &capsnap->atime,
capsnap->time_warp_seq,
capsnap->uid, capsnap->gid, capsnap->mode,
capsnap->xattr_version, capsnap->xattr_blob,
capsnap->follows, capsnap->inline_data);
next_follows = capsnap->follows + 1;
ceph_put_cap_snap(capsnap);
spin_lock(&ci->i_ceph_lock);
goto retry;
}
/* 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);
out:
if (psession)
*psession = session;
else if (session) {
mutex_unlock(&session->s_mutex);
ceph_put_mds_session(session);
}
}
static void ceph_flush_snaps(struct ceph_inode_info *ci)
{
spin_lock(&ci->i_ceph_lock);
__ceph_flush_snaps(ci, NULL, 0);
spin_unlock(&ci->i_ceph_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);
return dirty;
}
static void __add_cap_flushing_to_inode(struct ceph_inode_info *ci,
struct ceph_cap_flush *cf)
{
struct rb_node **p = &ci->i_cap_flush_tree.rb_node;
struct rb_node *parent = NULL;
struct ceph_cap_flush *other = NULL;
while (*p) {
parent = *p;
other = rb_entry(parent, struct ceph_cap_flush, i_node);
if (cf->tid < other->tid)
p = &(*p)->rb_left;
else if (cf->tid > other->tid)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(&cf->i_node, parent, p);
rb_insert_color(&cf->i_node, &ci->i_cap_flush_tree);
}
static void __add_cap_flushing_to_mdsc(struct ceph_mds_client *mdsc,
struct ceph_cap_flush *cf)
{
struct rb_node **p = &mdsc->cap_flush_tree.rb_node;
struct rb_node *parent = NULL;
struct ceph_cap_flush *other = NULL;
while (*p) {
parent = *p;
other = rb_entry(parent, struct ceph_cap_flush, g_node);
if (cf->tid < other->tid)
p = &(*p)->rb_left;
else if (cf->tid > other->tid)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(&cf->g_node, parent, p);
rb_insert_color(&cf->g_node, &mdsc->cap_flush_tree);
}
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)
{
struct rb_node *n = rb_first(&mdsc->cap_flush_tree);
if (n) {
struct ceph_cap_flush *cf =
rb_entry(n, struct ceph_cap_flush, g_node);
return cf->tid;
}
return 0;
}
/*
* 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,
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;
spin_lock(&mdsc->cap_dirty_lock);
list_del_init(&ci->i_dirty_item);
cf->tid = ++mdsc->last_cap_flush_tid;
__add_cap_flushing_to_mdsc(mdsc, cf);
*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++;
dout(" inode %p now flushing tid %llu\n", inode, cf->tid);
} else {
list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
dout(" inode %p now flushing (more) tid %llu\n",
inode, cf->tid);
}
spin_unlock(&mdsc->cap_dirty_lock);
__add_cap_flushing_to_inode(ci, cf);
*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;
}
/*
* 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 tried_invalidate = 0;
int delayed = 0, sent = 0, force_requeue = 0, num;
int queue_invalidate = 0;
int is_delayed = flags & CHECK_CAPS_NODELAY;
/* if we are unmounting, flush any unused caps immediately. */
if (mdsc->stopping)
is_delayed = 1;
spin_lock(&ci->i_ceph_lock);
if (ci->i_ceph_flags & CEPH_I_FLUSH)
flags |= CHECK_CAPS_FLUSH;
/* flush snaps first time around only */
if (!list_empty(&ci->i_cap_snaps))
__ceph_flush_snaps(ci, &session, 0);
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.
*/
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 ((!is_delayed || mdsc->stopping) &&
!S_ISDIR(inode->i_mode) && /* ignore readdir cache */
ci->i_wrbuffer_ref == 0 && /* 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) {
if (revoking & (CEPH_CAP_FILE_CACHE|
CEPH_CAP_FILE_LAZYIO)) {
dout("check_caps queuing invalidate\n");
queue_invalidate = 1;
ci->i_rdcache_revoking = ci->i_rdcache_gen;
} else {
dout("check_caps failed to invalidate pages\n");
/* we failed to invalidate pages. check these
caps again later. */
force_requeue = 1;
__cap_set_timeouts(mdsc, ci);
}
}
tried_invalidate = 1;
goto retry_locked;
}
num = 0;
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
cap = rb_entry(p, struct ceph_cap, ci_node);
num++;
/* 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->issued),
ceph_cap_string(cap_used),
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 ((inode->i_size << 1) >= ci->i_max_size &&
(ci->i_reported_size << 1) < ci->i_max_size) {
dout("i_size approaching max_size\n");
goto ack;
}
}
/* flush anything dirty? */
if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
ci->i_dirty_caps) {
dout("flushing dirty 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 &&
cap->mds_wanted == want)
continue; /* nope, all good */
if (is_delayed)
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;
}
}
/* 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,
&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, 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,
* otherwise cancel.
*/
if (delayed && is_delayed)
force_requeue = 1; /* __send_cap delayed release; requeue */
if (!delayed && !is_delayed)
__cap_delay_cancel(mdsc, ci);
else if (!is_delayed || force_requeue)
__cap_delay_requeue(mdsc, ci);
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) {
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)
goto out;
flushing = __mark_caps_flushing(inode, session, &flush_tid,
&oldest_flush_tid);
/* __send_cap drops i_ceph_lock */
delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, 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);
spin_unlock(&ci->i_ceph_lock);
}
} else {
struct rb_node *n = rb_last(&ci->i_cap_flush_tree);
if (n) {
struct ceph_cap_flush *cf =
rb_entry(n, struct ceph_cap_flush, i_node);
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);
struct ceph_cap_flush *cf;
struct rb_node *n;
int ret = 1;
spin_lock(&ci->i_ceph_lock);
n = rb_first(&ci->i_cap_flush_tree);
if (n) {
cf = rb_entry(n, struct ceph_cap_flush, i_node);
if (cf->tid <= flush_tid)
ret = 0;
}
spin_unlock(&ci->i_ceph_lock);
return ret;
}
/*
* Wait on any unsafe replies for the given inode. First wait on the
* newest request, and make that the upper bound. Then, if there are
* more requests, keep waiting on the oldest as long as it is still older
* than the original request.
*/
static void sync_write_wait(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct list_head *head = &ci->i_unsafe_writes;
struct ceph_osd_request *req;
u64 last_tid;
if (!S_ISREG(inode->i_mode))
return;
spin_lock(&ci->i_unsafe_lock);
if (list_empty(head))
goto out;
/* set upper bound as _last_ entry in chain */
req = list_last_entry(head, struct ceph_osd_request,
r_unsafe_item);
last_tid = req->r_tid;
do {
ceph_osdc_get_request(req);
spin_unlock(&ci->i_unsafe_lock);
dout("sync_write_wait on tid %llu (until %llu)\n",
req->r_tid, last_tid);
wait_for_completion(&req->r_safe_completion);
spin_lock(&ci->i_unsafe_lock);
ceph_osdc_put_request(req);
/*
* from here on look at first entry in chain, since we
* only want to wait for anything older than last_tid
*/
if (list_empty(head))
break;
req = list_first_entry(head, struct ceph_osd_request,
r_unsafe_item);
} while (req->r_tid < last_tid);
out:
spin_unlock(&ci->i_unsafe_lock);
}
/*
* 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_requeset_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" : "");
sync_write_wait(inode);
ret = filemap_write_and_wait_range(inode->i_mapping, 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;
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;
}
/*
* After a recovering MDS goes active, we need to resend any caps
* we were flushing.
*
* Caller holds session->s_mutex.
*/
static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_cap_snap *capsnap;
dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
flushing_item) {
struct ceph_inode_info *ci = capsnap->ci;
struct inode *inode = &ci->vfs_inode;
struct ceph_cap *cap;
spin_lock(&ci->i_ceph_lock);
cap = ci->i_auth_cap;
if (cap && cap->session == session) {
dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
cap, capsnap);
__ceph_flush_snaps(ci, &session, 1);
} else {
pr_err("%p auth cap %p not mds%d ???\n", inode,
cap, session->s_mds);
}
spin_unlock(&ci->i_ceph_lock);
}
}
static int __kick_flushing_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
struct ceph_inode_info *ci)
{
struct inode *inode = &ci->vfs_inode;
struct ceph_cap *cap;
struct ceph_cap_flush *cf;
struct rb_node *n;
int delayed = 0;
u64 first_tid = 0;
u64 oldest_flush_tid;
spin_lock(&mdsc->cap_dirty_lock);
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
spin_unlock(&mdsc->cap_dirty_lock);
while (true) {
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", inode,
cap, session->s_mds);
spin_unlock(&ci->i_ceph_lock);
break;
}
for (n = rb_first(&ci->i_cap_flush_tree); n; n = rb_next(n)) {
cf = rb_entry(n, struct ceph_cap_flush, i_node);
if (cf->tid >= first_tid)
break;
}
if (!n) {
spin_unlock(&ci->i_ceph_lock);
break;
}
cf = rb_entry(n, struct ceph_cap_flush, i_node);
first_tid = cf->tid + 1;
dout("kick_flushing_caps %p cap %p tid %llu %s\n", inode,
cap, cf->tid, ceph_cap_string(cf->caps));
delayed |= __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
__ceph_caps_used(ci),
__ceph_caps_wanted(ci),
cap->issued | cap->implemented,
cf->caps, cf->tid, oldest_flush_tid);
}
return delayed;
}
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;
dout("early_kick_flushing_caps mds%d\n", session->s_mds);
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) {
spin_unlock(&ci->i_ceph_lock);
if (!__kick_flushing_caps(mdsc, session, ci))
continue;
spin_lock(&ci->i_ceph_lock);
}
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;
kick_flushing_capsnaps(mdsc, session);
dout("kick_flushing_caps mds%d\n", session->s_mds);
list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
int delayed = __kick_flushing_caps(mdsc, session, ci);
if (delayed) {
spin_lock(&ci->i_ceph_lock);
__cap_delay_requeue(mdsc, ci);
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)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_cap *cap;
spin_lock(&ci->i_ceph_lock);
cap = ci->i_auth_cap;
dout("kick_flushing_inode_caps %p flushing %s\n", inode,
ceph_cap_string(ci->i_flushing_caps));
__ceph_flush_snaps(ci, &session, 1);
if (ci->i_flushing_caps) {
int delayed;
spin_lock(&mdsc->cap_dirty_lock);
list_move_tail(&ci->i_flushing_item,
&cap->session->s_cap_flushing);
spin_unlock(&mdsc->cap_dirty_lock);
spin_unlock(&ci->i_ceph_lock);
delayed = __kick_flushing_caps(mdsc, session, ci);
if (delayed) {
spin_lock(&ci->i_ceph_lock);
__cap_delay_requeue(mdsc, ci);
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) == 0) {
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);
__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 (!__ceph_is_any_caps(ci) &&
ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
dout("get_cap_refs %p forced umount\n", inode);
*err = -EIO;
ret = 1;
goto out_unlock;
}
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);
}
/*
* Wait for caps, and take cap references. If we can't get a WR cap
* due to a small max_size, make sure we check_max_size (and possibly
* ask the mds) so we don't get hung up indefinitely.
*/
int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
loff_t endoff, int *got, struct page **pinned_page)
{
int _got, ret, err = 0;
ret = ceph_pool_perm_check(ci, need);
if (ret < 0)
return ret;
while (true) {
if (endoff > 0)
check_max_size(&ci->vfs_inode, endoff);
err = 0;
_got = 0;
ret = try_get_cap_refs(ci, need, want, endoff,
false, &_got, &err);
if (ret) {
if (err == -EAGAIN)
continue;
if (err < 0)
return err;
} else {
ret = wait_event_interruptible(ci->i_cap_wq,
try_get_cap_refs(ci, need, want, endoff,
true, &_got, &err));
if (err == -EAGAIN)
continue;
if (err < 0)
ret = err;
if (ret < 0)
return ret;
}
if (ci->i_inline_version != CEPH_INLINE_NONE &&
(_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
i_size_read(&ci->vfs_inode) > 0) {
struct page *page =
find_get_page(ci->vfs_inode.i_mapping, 0);
if (page) {
if (PageUptodate(page)) {
*pinned_page = page;
break;
}
page_cache_release(page);
}
/*
* drop cap refs first because getattr while
* holding * caps refs can cause deadlock.
*/
ceph_put_cap_refs(ci, _got);
_got = 0;
/*
* getattr request will bring inline data into
* page cache
*/
ret = __ceph_do_getattr(&ci->vfs_inode, NULL,
CEPH_STAT_CAP_INLINE_DATA,
true);
if (ret < 0)
return ret;
continue;
}
break;
}
*got = _got;
return 0;
}
/*
* Take cap refs. Caller must already know we hold at least one ref
* on the caps in question or we don't know this is safe.
*/
void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
{
spin_lock(&ci->i_ceph_lock);
__take_cap_refs(ci, caps, false);
spin_unlock(&ci->i_ceph_lock);
}
/*
* drop cap_snap that is not associated with any snapshot.
* we don't need to send FLUSHSNAP message for it.
*/
static int ceph_try_drop_cap_snap(struct ceph_cap_snap *capsnap)
{
if (!capsnap->need_flush &&
!capsnap->writing && !capsnap->dirty_pages) {
dout("dropping cap_snap %p follows %llu\n",
capsnap, capsnap->follows);
ceph_put_snap_context(capsnap->context);
list_del(&capsnap->ci_item);
list_del(&capsnap->flushing_item);
ceph_put_cap_snap(capsnap);
return 1;
}
return 0;
}
/*
* Release cap refs.
*
* If we released the last ref on any given cap, call ceph_check_caps
* to release (or schedule a release).
*
* If we are releasing a WR cap (from a sync write), finalize any affected
* cap_snap, and wake up any waiters.
*/
void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
{
struct inode *inode = &ci->vfs_inode;
int last = 0, put = 0, flushsnaps = 0, wake = 0;
spin_lock(&ci->i_ceph_lock);
if (had & CEPH_CAP_PIN)
--ci->i_pin_ref;
if (had & CEPH_CAP_FILE_RD)
if (--ci->i_rd_ref == 0)
last++;
if (had & CEPH_CAP_FILE_CACHE)
if (--ci->i_rdcache_ref == 0)
last++;
if (had & CEPH_CAP_FILE_BUFFER) {
if (--ci->i_wb_ref == 0) {
last++;
put++;
}
dout("put_cap_refs %p wb %d -> %d (?)\n",
inode, ci->i_wb_ref+1, ci->i_wb_ref);
}
if (had & CEPH_CAP_FILE_WR)
if (--ci->i_wr_ref == 0) {
last++;
if (__ceph_have_pending_cap_snap(ci)) {
struct ceph_cap_snap *capsnap =
list_last_entry(&ci->i_cap_snaps,
struct ceph_cap_snap,
ci_item);
capsnap->writing = 0;
if (ceph_try_drop_cap_snap(capsnap))
put++;
else if (__ceph_finish_cap_snap(ci, capsnap))
flushsnaps = 1;
wake = 1;
}
if (ci->i_wrbuffer_ref_head == 0 &&
ci->i_dirty_caps == 0 &&
ci->i_flushing_caps == 0) {
BUG_ON(!ci->i_head_snapc);
ceph_put_snap_context(ci->i_head_snapc);
ci->i_head_snapc = NULL;
}
/* see comment in __ceph_remove_cap() */
if (!__ceph_is_any_caps(ci) && ci->i_snap_realm)
drop_inode_snap_realm(ci);
}
spin_unlock(&ci->i_ceph_lock);
dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
last ? " last" : "", put ? " put" : "");
if (last && !flushsnaps)
ceph_check_caps(ci, 0, NULL);
else if (flushsnaps)
ceph_flush_snaps(ci);
if (wake)
wake_up_all(&ci->i_cap_wq);
while (put-- > 0)
iput(inode);
}
/*
* Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
* context. Adjust per-snap dirty page accounting as appropriate.
* Once all dirty data for a cap_snap is flushed, flush snapped file
* metadata back to the MDS. If we dropped the last ref, call
* ceph_check_caps.
*/
void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
struct ceph_snap_context *snapc)
{
struct inode *inode = &ci->vfs_inode;
int last = 0;
int complete_capsnap = 0;
int drop_capsnap = 0;
int found = 0;
struct ceph_cap_snap *capsnap = NULL;
spin_lock(&ci->i_ceph_lock);
ci->i_wrbuffer_ref -= nr;
last = !ci->i_wrbuffer_ref;
if (ci->i_head_snapc == snapc) {
ci->i_wrbuffer_ref_head -= nr;
if (ci->i_wrbuffer_ref_head == 0 &&
ci->i_wr_ref == 0 &&
ci->i_dirty_caps == 0 &&
ci->i_flushing_caps == 0) {
BUG_ON(!ci->i_head_snapc);
ceph_put_snap_context(ci->i_head_snapc);
ci->i_head_snapc = NULL;
}
dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
inode,
ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
last ? " LAST" : "");
} else {
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
if (capsnap->context == snapc) {
found = 1;
break;
}
}
BUG_ON(!found);
capsnap->dirty_pages -= nr;
if (capsnap->dirty_pages == 0) {
complete_capsnap = 1;
drop_capsnap = ceph_try_drop_cap_snap(capsnap);
}
dout("put_wrbuffer_cap_refs on %p cap_snap %p "
" snap %lld %d/%d -> %d/%d %s%s\n",
inode, capsnap, capsnap->context->seq,
ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
ci->i_wrbuffer_ref, capsnap->dirty_pages,
last ? " (wrbuffer last)" : "",
complete_capsnap ? " (complete capsnap)" : "");
}
spin_unlock(&ci->i_ceph_lock);
if (last) {
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
iput(inode);
} else if (complete_capsnap) {
ceph_flush_snaps(ci);
wake_up_all(&ci->i_cap_wq);
}
if (drop_capsnap)
iput(inode);
}
/*
* Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
*/
static void invalidate_aliases(struct inode *inode)
{
struct dentry *dn, *prev = NULL;
dout("invalidate_aliases inode %p\n", inode);
d_prune_aliases(inode);
/*
* For non-directory inode, d_find_alias() only returns
* hashed dentry. After calling d_invalidate(), the
* dentry becomes unhashed.
*
* For directory inode, d_find_alias() can return
* unhashed dentry. But directory inode should have
* one alias at most.
*/
while ((dn = d_find_alias(inode))) {