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authorDavid Howells <dhowells@redhat.com>2009-11-19 21:11:45 +0300
committerDavid Howells <dhowells@redhat.com>2009-11-19 21:11:45 +0300
commit60d543ca724be155c2b6166e36a00c80b21bd810 (patch)
tree90ec6edd77ddb7666dbf7069aa2e001f155cea49
parentd461d26dde901b0523c46b0317e7fccf574a3933 (diff)
downloadlinux-60d543ca724be155c2b6166e36a00c80b21bd810.tar.xz
FS-Cache: Start processing an object's operations on that object's death
Start processing an object's operations when that object moves into the DYING state as the object cannot be destroyed until all its outstanding operations have completed. Furthermore, make sure that read and allocation operations handle being woken up on a dead object. Such events are recorded in the Allocs.abt and Retrvls.abt statistics as viewable through /proc/fs/fscache/stats. The code for waiting for object activation for the read and allocation operations is also extracted into its own function as it is much the same in all cases, differing only in the stats incremented. Signed-off-by: David Howells <dhowells@redhat.com>
-rw-r--r--Documentation/filesystems/caching/fscache.txt2
-rw-r--r--fs/fscache/internal.h5
-rw-r--r--fs/fscache/object.c1
-rw-r--r--fs/fscache/page.c112
-rw-r--r--fs/fscache/stats.c12
-rw-r--r--include/linux/fscache-cache.h4
6 files changed, 75 insertions, 61 deletions
diff --git a/Documentation/filesystems/caching/fscache.txt b/Documentation/filesystems/caching/fscache.txt
index 7097fd29fb3d..3c23411956bb 100644
--- a/Documentation/filesystems/caching/fscache.txt
+++ b/Documentation/filesystems/caching/fscache.txt
@@ -253,6 +253,7 @@ proc files.
int=N Number of alloc reqs aborted -ERESTARTSYS
ops=N Number of alloc reqs submitted
owt=N Number of alloc reqs waited for CPU time
+ abt=N Number of alloc reqs aborted due to object death
Retrvls n=N Number of retrieval (read) requests seen
ok=N Number of successful retr reqs
wt=N Number of retr reqs that waited on lookup completion
@@ -262,6 +263,7 @@ proc files.
oom=N Number of retr reqs failed -ENOMEM
ops=N Number of retr reqs submitted
owt=N Number of retr reqs waited for CPU time
+ abt=N Number of retr reqs aborted due to object death
Stores n=N Number of storage (write) requests seen
ok=N Number of successful store reqs
agn=N Number of store reqs on a page already pending storage
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 2bf463d26080..5b49a373689b 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -156,6 +156,7 @@ extern atomic_t fscache_n_allocs_ok;
extern atomic_t fscache_n_allocs_wait;
extern atomic_t fscache_n_allocs_nobufs;
extern atomic_t fscache_n_allocs_intr;
+extern atomic_t fscache_n_allocs_object_dead;
extern atomic_t fscache_n_alloc_ops;
extern atomic_t fscache_n_alloc_op_waits;
@@ -166,6 +167,7 @@ extern atomic_t fscache_n_retrievals_nodata;
extern atomic_t fscache_n_retrievals_nobufs;
extern atomic_t fscache_n_retrievals_intr;
extern atomic_t fscache_n_retrievals_nomem;
+extern atomic_t fscache_n_retrievals_object_dead;
extern atomic_t fscache_n_retrieval_ops;
extern atomic_t fscache_n_retrieval_op_waits;
@@ -249,9 +251,12 @@ static inline void fscache_stat_d(atomic_t *stat)
atomic_dec(stat);
}
+#define __fscache_stat(stat) (stat)
+
extern const struct file_operations fscache_stats_fops;
#else
+#define __fscache_stat(stat) (NULL)
#define fscache_stat(stat) do {} while (0)
#endif
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index 74bc562a2cbc..c85c9f582166 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -201,6 +201,7 @@ static void fscache_object_state_machine(struct fscache_object *object)
}
spin_unlock(&object->lock);
fscache_enqueue_dependents(object);
+ fscache_start_operations(object);
goto terminal_transit;
/* handle an abort during initialisation */
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index fc76798bd968..c598ea4c4e7d 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -314,6 +314,43 @@ static int fscache_wait_for_deferred_lookup(struct fscache_cookie *cookie)
}
/*
+ * wait for an object to become active (or dead)
+ */
+static int fscache_wait_for_retrieval_activation(struct fscache_object *object,
+ struct fscache_retrieval *op,
+ atomic_t *stat_op_waits,
+ atomic_t *stat_object_dead)
+{
+ int ret;
+
+ if (!test_bit(FSCACHE_OP_WAITING, &op->op.flags))
+ goto check_if_dead;
+
+ _debug(">>> WT");
+ fscache_stat(stat_op_waits);
+ if (wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
+ fscache_wait_bit_interruptible,
+ TASK_INTERRUPTIBLE) < 0) {
+ ret = fscache_cancel_op(&op->op);
+ if (ret == 0)
+ return -ERESTARTSYS;
+
+ /* it's been removed from the pending queue by another party,
+ * so we should get to run shortly */
+ wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
+ fscache_wait_bit, TASK_UNINTERRUPTIBLE);
+ }
+ _debug("<<< GO");
+
+check_if_dead:
+ if (unlikely(fscache_object_is_dead(object))) {
+ fscache_stat(stat_object_dead);
+ return -ENOBUFS;
+ }
+ return 0;
+}
+
+/*
* read a page from the cache or allocate a block in which to store it
* - we return:
* -ENOMEM - out of memory, nothing done
@@ -376,25 +413,12 @@ int __fscache_read_or_alloc_page(struct fscache_cookie *cookie,
/* we wait for the operation to become active, and then process it
* *here*, in this thread, and not in the thread pool */
- if (test_bit(FSCACHE_OP_WAITING, &op->op.flags)) {
- _debug(">>> WT");
- fscache_stat(&fscache_n_retrieval_op_waits);
- if (wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit_interruptible,
- TASK_INTERRUPTIBLE) < 0) {
- ret = fscache_cancel_op(&op->op);
- if (ret == 0) {
- ret = -ERESTARTSYS;
- goto error;
- }
-
- /* it's been removed from the pending queue by another
- * party, so we should get to run shortly */
- wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit, TASK_UNINTERRUPTIBLE);
- }
- _debug("<<< GO");
- }
+ ret = fscache_wait_for_retrieval_activation(
+ object, op,
+ __fscache_stat(&fscache_n_retrieval_op_waits),
+ __fscache_stat(&fscache_n_retrievals_object_dead));
+ if (ret < 0)
+ goto error;
/* ask the cache to honour the operation */
if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->cookie->flags)) {
@@ -506,25 +530,12 @@ int __fscache_read_or_alloc_pages(struct fscache_cookie *cookie,
/* we wait for the operation to become active, and then process it
* *here*, in this thread, and not in the thread pool */
- if (test_bit(FSCACHE_OP_WAITING, &op->op.flags)) {
- _debug(">>> WT");
- fscache_stat(&fscache_n_retrieval_op_waits);
- if (wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit_interruptible,
- TASK_INTERRUPTIBLE) < 0) {
- ret = fscache_cancel_op(&op->op);
- if (ret == 0) {
- ret = -ERESTARTSYS;
- goto error;
- }
-
- /* it's been removed from the pending queue by another
- * party, so we should get to run shortly */
- wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit, TASK_UNINTERRUPTIBLE);
- }
- _debug("<<< GO");
- }
+ ret = fscache_wait_for_retrieval_activation(
+ object, op,
+ __fscache_stat(&fscache_n_retrieval_op_waits),
+ __fscache_stat(&fscache_n_retrievals_object_dead));
+ if (ret < 0)
+ goto error;
/* ask the cache to honour the operation */
if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->cookie->flags)) {
@@ -612,25 +623,12 @@ int __fscache_alloc_page(struct fscache_cookie *cookie,
fscache_stat(&fscache_n_alloc_ops);
- if (test_bit(FSCACHE_OP_WAITING, &op->op.flags)) {
- _debug(">>> WT");
- fscache_stat(&fscache_n_alloc_op_waits);
- if (wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit_interruptible,
- TASK_INTERRUPTIBLE) < 0) {
- ret = fscache_cancel_op(&op->op);
- if (ret == 0) {
- ret = -ERESTARTSYS;
- goto error;
- }
-
- /* it's been removed from the pending queue by another
- * party, so we should get to run shortly */
- wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit, TASK_UNINTERRUPTIBLE);
- }
- _debug("<<< GO");
- }
+ ret = fscache_wait_for_retrieval_activation(
+ object, op,
+ __fscache_stat(&fscache_n_alloc_op_waits),
+ __fscache_stat(&fscache_n_allocs_object_dead));
+ if (ret < 0)
+ goto error;
/* ask the cache to honour the operation */
fscache_stat(&fscache_n_cop_allocate_page);
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index 9e15289eb5c1..05f77caf4a2d 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -39,6 +39,7 @@ atomic_t fscache_n_allocs_ok;
atomic_t fscache_n_allocs_wait;
atomic_t fscache_n_allocs_nobufs;
atomic_t fscache_n_allocs_intr;
+atomic_t fscache_n_allocs_object_dead;
atomic_t fscache_n_alloc_ops;
atomic_t fscache_n_alloc_op_waits;
@@ -49,6 +50,7 @@ atomic_t fscache_n_retrievals_nodata;
atomic_t fscache_n_retrievals_nobufs;
atomic_t fscache_n_retrievals_intr;
atomic_t fscache_n_retrievals_nomem;
+atomic_t fscache_n_retrievals_object_dead;
atomic_t fscache_n_retrieval_ops;
atomic_t fscache_n_retrieval_op_waits;
@@ -188,9 +190,10 @@ static int fscache_stats_show(struct seq_file *m, void *v)
atomic_read(&fscache_n_allocs_wait),
atomic_read(&fscache_n_allocs_nobufs),
atomic_read(&fscache_n_allocs_intr));
- seq_printf(m, "Allocs : ops=%u owt=%u\n",
+ seq_printf(m, "Allocs : ops=%u owt=%u abt=%u\n",
atomic_read(&fscache_n_alloc_ops),
- atomic_read(&fscache_n_alloc_op_waits));
+ atomic_read(&fscache_n_alloc_op_waits),
+ atomic_read(&fscache_n_allocs_object_dead));
seq_printf(m, "Retrvls: n=%u ok=%u wt=%u nod=%u nbf=%u"
" int=%u oom=%u\n",
@@ -201,9 +204,10 @@ static int fscache_stats_show(struct seq_file *m, void *v)
atomic_read(&fscache_n_retrievals_nobufs),
atomic_read(&fscache_n_retrievals_intr),
atomic_read(&fscache_n_retrievals_nomem));
- seq_printf(m, "Retrvls: ops=%u owt=%u\n",
+ seq_printf(m, "Retrvls: ops=%u owt=%u abt=%u\n",
atomic_read(&fscache_n_retrieval_ops),
- atomic_read(&fscache_n_retrieval_op_waits));
+ atomic_read(&fscache_n_retrieval_op_waits),
+ atomic_read(&fscache_n_retrievals_object_dead));
seq_printf(m, "Stores : n=%u ok=%u agn=%u nbf=%u oom=%u\n",
atomic_read(&fscache_n_stores),
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 4750d5fb419f..907bb56c5888 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -404,6 +404,10 @@ extern const char *fscache_object_states[];
(obj)->state >= FSCACHE_OBJECT_AVAILABLE && \
(obj)->state < FSCACHE_OBJECT_DYING)
+#define fscache_object_is_dead(obj) \
+ (test_bit(FSCACHE_IOERROR, &(obj)->cache->flags) && \
+ (obj)->state >= FSCACHE_OBJECT_DYING)
+
extern const struct slow_work_ops fscache_object_slow_work_ops;
/**