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-rw-r--r--fs/fscache/cookie.c1
-rw-r--r--fs/fscache/internal.h4
-rw-r--r--fs/fscache/page.c52
-rw-r--r--fs/fscache/stats.c10
4 files changed, 48 insertions, 19 deletions
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index e6854f5222f5..f979659c1b3f 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -36,6 +36,7 @@ void fscache_cookie_init_once(void *_cookie)
memset(cookie, 0, sizeof(*cookie));
spin_lock_init(&cookie->lock);
+ spin_lock_init(&cookie->stores_lock);
INIT_HLIST_HEAD(&cookie->backing_objects);
}
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 50324ad2b194..ba1853fa1ff9 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -17,6 +17,7 @@
* - cache->object_list_lock
* - object->lock
* - object->parent->lock
+ * - cookie->stores_lock
* - fscache_thread_lock
*
*/
@@ -174,6 +175,9 @@ extern atomic_t fscache_n_stores_nobufs;
extern atomic_t fscache_n_stores_oom;
extern atomic_t fscache_n_store_ops;
extern atomic_t fscache_n_store_calls;
+extern atomic_t fscache_n_store_pages;
+extern atomic_t fscache_n_store_radix_deletes;
+extern atomic_t fscache_n_store_pages_over_limit;
extern atomic_t fscache_n_marks;
extern atomic_t fscache_n_uncaches;
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index e6f2e61133a1..3ea8897bc217 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -45,16 +45,26 @@ EXPORT_SYMBOL(__fscache_wait_on_page_write);
/*
* note that a page has finished being written to the cache
*/
-static void fscache_end_page_write(struct fscache_cookie *cookie, struct page *page)
+static void fscache_end_page_write(struct fscache_object *object,
+ struct page *page)
{
- struct page *xpage;
+ struct fscache_cookie *cookie;
+ struct page *xpage = NULL;
- spin_lock(&cookie->lock);
- xpage = radix_tree_delete(&cookie->stores, page->index);
- spin_unlock(&cookie->lock);
- ASSERT(xpage != NULL);
-
- wake_up_bit(&cookie->flags, 0);
+ spin_lock(&object->lock);
+ cookie = object->cookie;
+ if (cookie) {
+ /* delete the page from the tree if it is now no longer
+ * pending */
+ spin_lock(&cookie->stores_lock);
+ fscache_stat(&fscache_n_store_radix_deletes);
+ xpage = radix_tree_delete(&cookie->stores, page->index);
+ spin_unlock(&cookie->stores_lock);
+ wake_up_bit(&cookie->flags, 0);
+ }
+ spin_unlock(&object->lock);
+ if (xpage)
+ page_cache_release(xpage);
}
/*
@@ -591,7 +601,7 @@ static void fscache_write_op(struct fscache_operation *_op)
struct fscache_storage *op =
container_of(_op, struct fscache_storage, op);
struct fscache_object *object = op->op.object;
- struct fscache_cookie *cookie = object->cookie;
+ struct fscache_cookie *cookie;
struct page *page;
unsigned n;
void *results[1];
@@ -601,16 +611,17 @@ static void fscache_write_op(struct fscache_operation *_op)
fscache_set_op_state(&op->op, "GetPage");
- spin_lock(&cookie->lock);
spin_lock(&object->lock);
+ cookie = object->cookie;
- if (!fscache_object_is_active(object)) {
+ if (!fscache_object_is_active(object) || !cookie) {
spin_unlock(&object->lock);
- spin_unlock(&cookie->lock);
_leave("");
return;
}
+ spin_lock(&cookie->stores_lock);
+
fscache_stat(&fscache_n_store_calls);
/* find a page to store */
@@ -621,23 +632,25 @@ static void fscache_write_op(struct fscache_operation *_op)
goto superseded;
page = results[0];
_debug("gang %d [%lx]", n, page->index);
- if (page->index > op->store_limit)
+ if (page->index > op->store_limit) {
+ fscache_stat(&fscache_n_store_pages_over_limit);
goto superseded;
+ }
radix_tree_tag_clear(&cookie->stores, page->index,
FSCACHE_COOKIE_PENDING_TAG);
+ spin_unlock(&cookie->stores_lock);
spin_unlock(&object->lock);
- spin_unlock(&cookie->lock);
if (page) {
fscache_set_op_state(&op->op, "Store");
+ fscache_stat(&fscache_n_store_pages);
fscache_stat(&fscache_n_cop_write_page);
ret = object->cache->ops->write_page(op, page);
fscache_stat_d(&fscache_n_cop_write_page);
fscache_set_op_state(&op->op, "EndWrite");
- fscache_end_page_write(cookie, page);
- page_cache_release(page);
+ fscache_end_page_write(object, page);
if (ret < 0) {
fscache_set_op_state(&op->op, "Abort");
fscache_abort_object(object);
@@ -653,9 +666,9 @@ superseded:
/* this writer is going away and there aren't any more things to
* write */
_debug("cease");
+ spin_unlock(&cookie->stores_lock);
clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
spin_unlock(&object->lock);
- spin_unlock(&cookie->lock);
_leave("");
}
@@ -731,6 +744,7 @@ int __fscache_write_page(struct fscache_cookie *cookie,
/* add the page to the pending-storage radix tree on the backing
* object */
spin_lock(&object->lock);
+ spin_lock(&cookie->stores_lock);
_debug("store limit %llx", (unsigned long long) object->store_limit);
@@ -751,6 +765,7 @@ int __fscache_write_page(struct fscache_cookie *cookie,
if (test_and_set_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags))
goto already_pending;
+ spin_unlock(&cookie->stores_lock);
spin_unlock(&object->lock);
op->op.debug_id = atomic_inc_return(&fscache_op_debug_id);
@@ -772,6 +787,7 @@ int __fscache_write_page(struct fscache_cookie *cookie,
already_queued:
fscache_stat(&fscache_n_stores_again);
already_pending:
+ spin_unlock(&cookie->stores_lock);
spin_unlock(&object->lock);
spin_unlock(&cookie->lock);
radix_tree_preload_end();
@@ -781,7 +797,9 @@ already_pending:
return 0;
submit_failed:
+ spin_lock(&cookie->stores_lock);
radix_tree_delete(&cookie->stores, page->index);
+ spin_unlock(&cookie->stores_lock);
page_cache_release(page);
ret = -ENOBUFS;
goto nobufs;
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index 4c07439d1307..1d53ea68409e 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -58,6 +58,9 @@ atomic_t fscache_n_stores_nobufs;
atomic_t fscache_n_stores_oom;
atomic_t fscache_n_store_ops;
atomic_t fscache_n_store_calls;
+atomic_t fscache_n_store_pages;
+atomic_t fscache_n_store_radix_deletes;
+atomic_t fscache_n_store_pages_over_limit;
atomic_t fscache_n_marks;
atomic_t fscache_n_uncaches;
@@ -200,9 +203,12 @@ static int fscache_stats_show(struct seq_file *m, void *v)
atomic_read(&fscache_n_stores_again),
atomic_read(&fscache_n_stores_nobufs),
atomic_read(&fscache_n_stores_oom));
- seq_printf(m, "Stores : ops=%u run=%u\n",
+ seq_printf(m, "Stores : ops=%u run=%u pgs=%u rxd=%u olm=%u\n",
atomic_read(&fscache_n_store_ops),
- atomic_read(&fscache_n_store_calls));
+ atomic_read(&fscache_n_store_calls),
+ atomic_read(&fscache_n_store_pages),
+ atomic_read(&fscache_n_store_radix_deletes),
+ atomic_read(&fscache_n_store_pages_over_limit));
seq_printf(m, "Ops : pend=%u run=%u enq=%u can=%u\n",
atomic_read(&fscache_n_op_pend),
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 02:57:45 +0000