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-rw-r--r--fs/fscache/cache.c2
-rw-r--r--fs/fscache/cookie.c388
-rw-r--r--fs/fscache/fsdef.c55
-rw-r--r--fs/fscache/histogram.c17
-rw-r--r--fs/fscache/internal.h49
-rw-r--r--fs/fscache/main.c1
-rw-r--r--fs/fscache/netfs.c71
-rw-r--r--fs/fscache/object-list.c28
-rw-r--r--fs/fscache/object.c68
-rw-r--r--fs/fscache/operation.c26
-rw-r--r--fs/fscache/page.c84
-rw-r--r--fs/fscache/proc.c8
-rw-r--r--fs/fscache/stats.c18
13 files changed, 547 insertions, 268 deletions
diff --git a/fs/fscache/cache.c b/fs/fscache/cache.c
index 56cce7fdd39e..c184c5a356ff 100644
--- a/fs/fscache/cache.c
+++ b/fs/fscache/cache.c
@@ -125,7 +125,7 @@ struct fscache_cache *fscache_select_cache_for_object(
}
/* the parent is unbacked */
- if (cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX) {
+ if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) {
/* cookie not an index and is unbacked */
spin_unlock(&cookie->lock);
_leave(" = NULL [cookie ub,ni]");
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index d705125665f0..97137d7ec5ee 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -21,12 +21,54 @@ struct kmem_cache *fscache_cookie_jar;
static atomic_t fscache_object_debug_id = ATOMIC_INIT(0);
-static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie);
+#define fscache_cookie_hash_shift 15
+static struct hlist_bl_head fscache_cookie_hash[1 << fscache_cookie_hash_shift];
+
+static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie,
+ loff_t object_size);
static int fscache_alloc_object(struct fscache_cache *cache,
struct fscache_cookie *cookie);
static int fscache_attach_object(struct fscache_cookie *cookie,
struct fscache_object *object);
+static void fscache_print_cookie(struct fscache_cookie *cookie, char prefix)
+{
+ struct hlist_node *object;
+ const u8 *k;
+ unsigned loop;
+
+ pr_err("%c-cookie c=%p [p=%p fl=%lx nc=%u na=%u]\n",
+ prefix, cookie, cookie->parent, cookie->flags,
+ atomic_read(&cookie->n_children),
+ atomic_read(&cookie->n_active));
+ pr_err("%c-cookie d=%p n=%p\n",
+ prefix, cookie->def, cookie->netfs_data);
+
+ object = READ_ONCE(cookie->backing_objects.first);
+ if (object)
+ pr_err("%c-cookie o=%p\n",
+ prefix, hlist_entry(object, struct fscache_object, cookie_link));
+
+ pr_err("%c-key=[%u] '", prefix, cookie->key_len);
+ k = (cookie->key_len <= sizeof(cookie->inline_key)) ?
+ cookie->inline_key : cookie->key;
+ for (loop = 0; loop < cookie->key_len; loop++)
+ pr_cont("%02x", k[loop]);
+ pr_cont("'\n");
+}
+
+void fscache_free_cookie(struct fscache_cookie *cookie)
+{
+ if (cookie) {
+ BUG_ON(!hlist_empty(&cookie->backing_objects));
+ if (cookie->aux_len > sizeof(cookie->inline_aux))
+ kfree(cookie->aux);
+ if (cookie->key_len > sizeof(cookie->inline_key))
+ kfree(cookie->key);
+ kmem_cache_free(fscache_cookie_jar, cookie);
+ }
+}
+
/*
* initialise an cookie jar slab element prior to any use
*/
@@ -41,6 +83,170 @@ void fscache_cookie_init_once(void *_cookie)
}
/*
+ * Set the index key in a cookie. The cookie struct has space for a 12-byte
+ * key plus length and hash, but if that's not big enough, it's instead a
+ * pointer to a buffer containing 3 bytes of hash, 1 byte of length and then
+ * the key data.
+ */
+static int fscache_set_key(struct fscache_cookie *cookie,
+ const void *index_key, size_t index_key_len)
+{
+ unsigned long long h;
+ u32 *buf;
+ int i;
+
+ cookie->key_len = index_key_len;
+
+ if (index_key_len > sizeof(cookie->inline_key)) {
+ buf = kzalloc(index_key_len, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ cookie->key = buf;
+ } else {
+ buf = (u32 *)cookie->inline_key;
+ buf[0] = 0;
+ buf[1] = 0;
+ buf[2] = 0;
+ }
+
+ memcpy(buf, index_key, index_key_len);
+
+ /* Calculate a hash and combine this with the length in the first word
+ * or first half word
+ */
+ h = (unsigned long)cookie->parent;
+ h += index_key_len + cookie->type;
+ for (i = 0; i < (index_key_len + sizeof(u32) - 1) / sizeof(u32); i++)
+ h += buf[i];
+
+ cookie->key_hash = h ^ (h >> 32);
+ return 0;
+}
+
+static long fscache_compare_cookie(const struct fscache_cookie *a,
+ const struct fscache_cookie *b)
+{
+ const void *ka, *kb;
+
+ if (a->key_hash != b->key_hash)
+ return (long)a->key_hash - (long)b->key_hash;
+ if (a->parent != b->parent)
+ return (long)a->parent - (long)b->parent;
+ if (a->key_len != b->key_len)
+ return (long)a->key_len - (long)b->key_len;
+ if (a->type != b->type)
+ return (long)a->type - (long)b->type;
+
+ if (a->key_len <= sizeof(a->inline_key)) {
+ ka = &a->inline_key;
+ kb = &b->inline_key;
+ } else {
+ ka = a->key;
+ kb = b->key;
+ }
+ return memcmp(ka, kb, a->key_len);
+}
+
+/*
+ * Allocate a cookie.
+ */
+struct fscache_cookie *fscache_alloc_cookie(
+ struct fscache_cookie *parent,
+ const struct fscache_cookie_def *def,
+ const void *index_key, size_t index_key_len,
+ const void *aux_data, size_t aux_data_len,
+ void *netfs_data,
+ loff_t object_size)
+{
+ struct fscache_cookie *cookie;
+
+ /* allocate and initialise a cookie */
+ cookie = kmem_cache_alloc(fscache_cookie_jar, GFP_KERNEL);
+ if (!cookie)
+ return NULL;
+
+ cookie->key_len = index_key_len;
+ cookie->aux_len = aux_data_len;
+
+ if (fscache_set_key(cookie, index_key, index_key_len) < 0)
+ goto nomem;
+
+ if (cookie->aux_len <= sizeof(cookie->inline_aux)) {
+ memcpy(cookie->inline_aux, aux_data, cookie->aux_len);
+ } else {
+ cookie->aux = kmemdup(aux_data, cookie->aux_len, GFP_KERNEL);
+ if (!cookie->aux)
+ goto nomem;
+ }
+
+ atomic_set(&cookie->usage, 1);
+ atomic_set(&cookie->n_children, 0);
+
+ /* We keep the active count elevated until relinquishment to prevent an
+ * attempt to wake up every time the object operations queue quiesces.
+ */
+ atomic_set(&cookie->n_active, 1);
+
+ cookie->def = def;
+ cookie->parent = parent;
+ cookie->netfs_data = netfs_data;
+ cookie->flags = (1 << FSCACHE_COOKIE_NO_DATA_YET);
+ cookie->type = def->type;
+
+ /* radix tree insertion won't use the preallocation pool unless it's
+ * told it may not wait */
+ INIT_RADIX_TREE(&cookie->stores, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
+ return cookie;
+
+nomem:
+ fscache_free_cookie(cookie);
+ return NULL;
+}
+
+/*
+ * Attempt to insert the new cookie into the hash. If there's a collision, we
+ * return the old cookie if it's not in use and an error otherwise.
+ */
+struct fscache_cookie *fscache_hash_cookie(struct fscache_cookie *candidate)
+{
+ struct fscache_cookie *cursor;
+ struct hlist_bl_head *h;
+ struct hlist_bl_node *p;
+ unsigned int bucket;
+
+ bucket = candidate->key_hash & (ARRAY_SIZE(fscache_cookie_hash) - 1);
+ h = &fscache_cookie_hash[bucket];
+
+ hlist_bl_lock(h);
+ hlist_bl_for_each_entry(cursor, p, h, hash_link) {
+ if (fscache_compare_cookie(candidate, cursor) == 0)
+ goto collision;
+ }
+
+ __set_bit(FSCACHE_COOKIE_ACQUIRED, &candidate->flags);
+ fscache_cookie_get(candidate->parent, fscache_cookie_get_acquire_parent);
+ atomic_inc(&candidate->parent->n_children);
+ hlist_bl_add_head(&candidate->hash_link, h);
+ hlist_bl_unlock(h);
+ return candidate;
+
+collision:
+ if (test_and_set_bit(FSCACHE_COOKIE_ACQUIRED, &cursor->flags)) {
+ trace_fscache_cookie(cursor, fscache_cookie_collision,
+ atomic_read(&cursor->usage));
+ pr_err("Duplicate cookie detected\n");
+ fscache_print_cookie(cursor, 'O');
+ fscache_print_cookie(candidate, 'N');
+ hlist_bl_unlock(h);
+ return NULL;
+ }
+
+ fscache_cookie_get(cursor, fscache_cookie_get_reacquire);
+ hlist_bl_unlock(h);
+ return cursor;
+}
+
+/*
* request a cookie to represent an object (index, datafile, xattr, etc)
* - parent specifies the parent object
* - the top level index cookie for each netfs is stored in the fscache_netfs
@@ -58,10 +264,13 @@ void fscache_cookie_init_once(void *_cookie)
struct fscache_cookie *__fscache_acquire_cookie(
struct fscache_cookie *parent,
const struct fscache_cookie_def *def,
+ const void *index_key, size_t index_key_len,
+ const void *aux_data, size_t aux_data_len,
void *netfs_data,
+ loff_t object_size,
bool enable)
{
- struct fscache_cookie *cookie;
+ struct fscache_cookie *candidate, *cookie;
BUG_ON(!def);
@@ -69,6 +278,13 @@ struct fscache_cookie *__fscache_acquire_cookie(
parent ? (char *) parent->def->name : "<no-parent>",
def->name, netfs_data, enable);
+ if (!index_key || !index_key_len || index_key_len > 255 || aux_data_len > 255)
+ return NULL;
+ if (!aux_data || !aux_data_len) {
+ aux_data = NULL;
+ aux_data_len = 0;
+ }
+
fscache_stat(&fscache_n_acquires);
/* if there's no parent cookie, then we don't create one here either */
@@ -79,41 +295,31 @@ struct fscache_cookie *__fscache_acquire_cookie(
}
/* validate the definition */
- BUG_ON(!def->get_key);
BUG_ON(!def->name[0]);
BUG_ON(def->type == FSCACHE_COOKIE_TYPE_INDEX &&
- parent->def->type != FSCACHE_COOKIE_TYPE_INDEX);
+ parent->type != FSCACHE_COOKIE_TYPE_INDEX);
- /* allocate and initialise a cookie */
- cookie = kmem_cache_alloc(fscache_cookie_jar, GFP_KERNEL);
- if (!cookie) {
+ candidate = fscache_alloc_cookie(parent, def,
+ index_key, index_key_len,
+ aux_data, aux_data_len,
+ netfs_data, object_size);
+ if (!candidate) {
fscache_stat(&fscache_n_acquires_oom);
_leave(" [ENOMEM]");
return NULL;
}
- atomic_set(&cookie->usage, 1);
- atomic_set(&cookie->n_children, 0);
-
- /* We keep the active count elevated until relinquishment to prevent an
- * attempt to wake up every time the object operations queue quiesces.
- */
- atomic_set(&cookie->n_active, 1);
-
- atomic_inc(&parent->usage);
- atomic_inc(&parent->n_children);
+ cookie = fscache_hash_cookie(candidate);
+ if (!cookie) {
+ trace_fscache_cookie(candidate, fscache_cookie_discard, 1);
+ goto out;
+ }
- cookie->def = def;
- cookie->parent = parent;
- cookie->netfs_data = netfs_data;
- cookie->flags = (1 << FSCACHE_COOKIE_NO_DATA_YET);
+ if (cookie == candidate)
+ candidate = NULL;
- /* radix tree insertion won't use the preallocation pool unless it's
- * told it may not wait */
- INIT_RADIX_TREE(&cookie->stores, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
-
- switch (cookie->def->type) {
+ switch (cookie->type) {
case FSCACHE_COOKIE_TYPE_INDEX:
fscache_stat(&fscache_n_cookie_index);
break;
@@ -125,16 +331,19 @@ struct fscache_cookie *__fscache_acquire_cookie(
break;
}
+ trace_fscache_acquire(cookie);
+
if (enable) {
/* if the object is an index then we need do nothing more here
* - we create indices on disk when we need them as an index
* may exist in multiple caches */
- if (cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX) {
- if (fscache_acquire_non_index_cookie(cookie) == 0) {
+ if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) {
+ if (fscache_acquire_non_index_cookie(cookie, object_size) == 0) {
set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
} else {
atomic_dec(&parent->n_children);
- __fscache_cookie_put(cookie);
+ fscache_cookie_put(cookie,
+ fscache_cookie_put_acquire_nobufs);
fscache_stat(&fscache_n_acquires_nobufs);
_leave(" = NULL");
return NULL;
@@ -145,7 +354,9 @@ struct fscache_cookie *__fscache_acquire_cookie(
}
fscache_stat(&fscache_n_acquires_ok);
- _leave(" = %p", cookie);
+
+out:
+ fscache_free_cookie(candidate);
return cookie;
}
EXPORT_SYMBOL(__fscache_acquire_cookie);
@@ -154,24 +365,30 @@ EXPORT_SYMBOL(__fscache_acquire_cookie);
* Enable a cookie to permit it to accept new operations.
*/
void __fscache_enable_cookie(struct fscache_cookie *cookie,
+ const void *aux_data,
+ loff_t object_size,
bool (*can_enable)(void *data),
void *data)
{
_enter("%p", cookie);
+ trace_fscache_enable(cookie);
+
wait_on_bit_lock(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK,
TASK_UNINTERRUPTIBLE);
+ fscache_update_aux(cookie, aux_data);
+
if (test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags))
goto out_unlock;
if (can_enable && !can_enable(data)) {
/* The netfs decided it didn't want to enable after all */
- } else if (cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX) {
+ } else if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) {
/* Wait for outstanding disablement to complete */
__fscache_wait_on_invalidate(cookie);
- if (fscache_acquire_non_index_cookie(cookie) == 0)
+ if (fscache_acquire_non_index_cookie(cookie, object_size) == 0)
set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
} else {
set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
@@ -188,11 +405,11 @@ EXPORT_SYMBOL(__fscache_enable_cookie);
* - this must make sure the index chain is instantiated and instantiate the
* object representation too
*/
-static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie)
+static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie,
+ loff_t object_size)
{
struct fscache_object *object;
struct fscache_cache *cache;
- uint64_t i_size;
int ret;
_enter("");
@@ -231,9 +448,6 @@ static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie)
return ret;
}
- /* pass on how big the object we're caching is supposed to be */
- cookie->def->get_attr(cookie->netfs_data, &i_size);
-
spin_lock(&cookie->lock);
if (hlist_empty(&cookie->backing_objects)) {
spin_unlock(&cookie->lock);
@@ -243,7 +457,7 @@ static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie)
object = hlist_entry(cookie->backing_objects.first,
struct fscache_object, cookie_link);
- fscache_set_store_limit(object, i_size);
+ fscache_set_store_limit(object, object_size);
/* initiate the process of looking up all the objects in the chain
* (done by fscache_initialise_object()) */
@@ -318,7 +532,7 @@ static int fscache_alloc_object(struct fscache_cache *cache,
* attached to the cookie */
if (fscache_attach_object(cookie, object) < 0) {
fscache_stat(&fscache_n_cop_put_object);
- cache->ops->put_object(object);
+ cache->ops->put_object(object, fscache_obj_put_attach_fail);
fscache_stat_d(&fscache_n_cop_put_object);
}
@@ -338,7 +552,7 @@ object_already_extant:
error_put:
fscache_stat(&fscache_n_cop_put_object);
- cache->ops->put_object(object);
+ cache->ops->put_object(object, fscache_obj_put_alloc_fail);
fscache_stat_d(&fscache_n_cop_put_object);
error:
_leave(" = %d", ret);
@@ -398,7 +612,7 @@ static int fscache_attach_object(struct fscache_cookie *cookie,
/* attach to the cookie */
object->cookie = cookie;
- atomic_inc(&cookie->usage);
+ fscache_cookie_get(cookie, fscache_cookie_get_attach_object);
hlist_add_head(&object->cookie_link, &cookie->backing_objects);
fscache_objlist_add(object);
@@ -426,10 +640,7 @@ void __fscache_invalidate(struct fscache_cookie *cookie)
* there, and if it's doing that, it may as well just retire the
* cookie.
*/
- ASSERTCMP(cookie->def->type, ==, FSCACHE_COOKIE_TYPE_DATAFILE);
-
- /* We will be updating the cookie too. */
- BUG_ON(!cookie->def->get_aux);
+ ASSERTCMP(cookie->type, ==, FSCACHE_COOKIE_TYPE_DATAFILE);
/* If there's an object, we tell the object state machine to handle the
* invalidation on our behalf, otherwise there's nothing to do.
@@ -473,7 +684,7 @@ EXPORT_SYMBOL(__fscache_wait_on_invalidate);
/*
* update the index entries backing a cookie
*/
-void __fscache_update_cookie(struct fscache_cookie *cookie)
+void __fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data)
{
struct fscache_object *object;
@@ -487,10 +698,10 @@ void __fscache_update_cookie(struct fscache_cookie *cookie)
_enter("{%s}", cookie->def->name);
- BUG_ON(!cookie->def->get_aux);
-
spin_lock(&cookie->lock);
+ fscache_update_aux(cookie, aux_data);
+
if (fscache_cookie_enabled(cookie)) {
/* update the index entry on disk in each cache backing this
* cookie.
@@ -509,13 +720,17 @@ EXPORT_SYMBOL(__fscache_update_cookie);
/*
* Disable a cookie to stop it from accepting new requests from the netfs.
*/
-void __fscache_disable_cookie(struct fscache_cookie *cookie, bool invalidate)
+void __fscache_disable_cookie(struct fscache_cookie *cookie,
+ const void *aux_data,
+ bool invalidate)
{
struct fscache_object *object;
bool awaken = false;
_enter("%p,%u", cookie, invalidate);
+ trace_fscache_disable(cookie);
+
ASSERTCMP(atomic_read(&cookie->n_active), >, 0);
if (atomic_read(&cookie->n_children) != 0) {
@@ -526,6 +741,9 @@ void __fscache_disable_cookie(struct fscache_cookie *cookie, bool invalidate)
wait_on_bit_lock(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK,
TASK_UNINTERRUPTIBLE);
+
+ fscache_update_aux(cookie, aux_data);
+
if (!test_and_clear_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags))
goto out_unlock_enable;
@@ -563,7 +781,7 @@ void __fscache_disable_cookie(struct fscache_cookie *cookie, bool invalidate)
}
/* Make sure any pending writes are cancelled. */
- if (cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX)
+ if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX)
fscache_invalidate_writes(cookie);
/* Reset the cookie state if it wasn't relinquished */
@@ -585,7 +803,9 @@ EXPORT_SYMBOL(__fscache_disable_cookie);
* - all dependents of this cookie must have already been unregistered
* (indices/files/pages)
*/
-void __fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
+void __fscache_relinquish_cookie(struct fscache_cookie *cookie,
+ const void *aux_data,
+ bool retire)
{
fscache_stat(&fscache_n_relinquishes);
if (retire)
@@ -601,15 +821,18 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
cookie, cookie->def->name, cookie->netfs_data,
atomic_read(&cookie->n_active), retire);
+ trace_fscache_relinquish(cookie, retire);
+
/* No further netfs-accessing operations on this cookie permitted */
- set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags);
+ if (test_and_set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags))
+ BUG();
- __fscache_disable_cookie(cookie, retire);
+ __fscache_disable_cookie(cookie, aux_data, retire);
/* Clear pointers back to the netfs */
cookie->netfs_data = NULL;
cookie->def = NULL;
- BUG_ON(cookie->stores.rnode);
+ BUG_ON(!radix_tree_empty(&cookie->stores));
if (cookie->parent) {
ASSERTCMP(atomic_read(&cookie->parent->usage), >, 0);
@@ -619,35 +842,54 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
/* Dispose of the netfs's link to the cookie */
ASSERTCMP(atomic_read(&cookie->usage), >, 0);
- fscache_cookie_put(cookie);
+ fscache_cookie_put(cookie, fscache_cookie_put_relinquish);
_leave("");
}
EXPORT_SYMBOL(__fscache_relinquish_cookie);
/*
- * destroy a cookie
+ * Remove a cookie from the hash table.
*/
-void __fscache_cookie_put(struct fscache_cookie *cookie)
+static void fscache_unhash_cookie(struct fscache_cookie *cookie)
+{
+ struct hlist_bl_head *h;
+ unsigned int bucket;
+
+ bucket = cookie->key_hash & (ARRAY_SIZE(fscache_cookie_hash) - 1);
+ h = &fscache_cookie_hash[bucket];
+
+ hlist_bl_lock(h);
+ hlist_bl_del(&cookie->hash_link);
+ hlist_bl_unlock(h);
+}
+
+/*
+ * Drop a reference to a cookie.
+ */
+void fscache_cookie_put(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where)
{
struct fscache_cookie *parent;
+ int usage;
_enter("%p", cookie);
- for (;;) {
- _debug("FREE COOKIE %p", cookie);
- parent = cookie->parent;
- BUG_ON(!hlist_empty(&cookie->backing_objects));
- kmem_cache_free(fscache_cookie_jar, cookie);
+ do {
+ usage = atomic_dec_return(&cookie->usage);
+ trace_fscache_cookie(cookie, where, usage);
- if (!parent)
- break;
+ if (usage > 0)
+ return;
+ BUG_ON(usage < 0);
+
+ parent = cookie->parent;
+ fscache_unhash_cookie(cookie);
+ fscache_free_cookie(cookie);
cookie = parent;
- BUG_ON(atomic_read(&cookie->usage) <= 0);
- if (!atomic_dec_and_test(&cookie->usage))
- break;
- }
+ where = fscache_cookie_put_parent;
+ } while (cookie);
_leave("");
}
@@ -657,7 +899,8 @@ void __fscache_cookie_put(struct fscache_cookie *cookie)
*
* NOTE: it only serves no-index type
*/
-int __fscache_check_consistency(struct fscache_cookie *cookie)
+int __fscache_check_consistency(struct fscache_cookie *cookie,
+ const void *aux_data)
{
struct fscache_operation *op;
struct fscache_object *object;
@@ -666,7 +909,7 @@ int __fscache_check_consistency(struct fscache_cookie *cookie)
_enter("%p,", cookie);
- ASSERTCMP(cookie->def->type, ==, FSCACHE_COOKIE_TYPE_DATAFILE);
+ ASSERTCMP(cookie->type, ==, FSCACHE_COOKIE_TYPE_DATAFILE);
if (fscache_wait_for_deferred_lookup(cookie) < 0)
return -ERESTARTSYS;
@@ -678,13 +921,16 @@ int __fscache_check_consistency(struct fscache_cookie *cookie)
if (!op)
return -ENOMEM;
- fscache_operation_init(op, NULL, NULL, NULL);
+ fscache_operation_init(cookie, op, NULL, NULL, NULL);
op->flags = FSCACHE_OP_MYTHREAD |
(1 << FSCACHE_OP_WAITING) |
(1 << FSCACHE_OP_UNUSE_COOKIE);
+ trace_fscache_page_op(cookie, NULL, op, fscache_page_op_check_consistency);
spin_lock(&cookie->lock);
+ fscache_update_aux(cookie, aux_data);
+
if (!fscache_cookie_enabled(cookie) ||
hlist_empty(&cookie->backing_objects))
goto inconsistent;
diff --git a/fs/fscache/fsdef.c b/fs/fscache/fsdef.c
index 5a117df2a9ef..aa46e48d8c75 100644
--- a/fs/fscache/fsdef.c
+++ b/fs/fscache/fsdef.c
@@ -13,16 +13,11 @@
#include <linux/module.h>
#include "internal.h"
-static uint16_t fscache_fsdef_netfs_get_key(const void *cookie_netfs_data,
- void *buffer, uint16_t bufmax);
-
-static uint16_t fscache_fsdef_netfs_get_aux(const void *cookie_netfs_data,
- void *buffer, uint16_t bufmax);
-
static
enum fscache_checkaux fscache_fsdef_netfs_check_aux(void *cookie_netfs_data,
const void *data,
- uint16_t datalen);
+ uint16_t datalen,
+ loff_t object_size);
/*
* The root index is owned by FS-Cache itself.
@@ -60,6 +55,7 @@ struct fscache_cookie fscache_fsdef_index = {
.backing_objects = HLIST_HEAD_INIT,
.def = &fscache_fsdef_index_def,
.flags = 1 << FSCACHE_COOKIE_ENABLED,
+ .type = FSCACHE_COOKIE_TYPE_INDEX,
};
EXPORT_SYMBOL(fscache_fsdef_index);
@@ -71,59 +67,18 @@ EXPORT_SYMBOL(fscache_fsdef_index);
struct fscache_cookie_def fscache_fsdef_netfs_def = {
.name = "FSDEF.netfs",
.type = FSCACHE_COOKIE_TYPE_INDEX,
- .get_key = fscache_fsdef_netfs_get_key,
- .get_aux = fscache_fsdef_netfs_get_aux,
.check_aux = fscache_fsdef_netfs_check_aux,
};
/*
- * get the key data for an FSDEF index record - this is the name of the netfs
- * for which this entry is created
- */
-static uint16_t fscache_fsdef_netfs_get_key(const void *cookie_netfs_data,
- void *buffer, uint16_t bufmax)
-{
- const struct fscache_netfs *netfs = cookie_netfs_data;
- unsigned klen;
-
- _enter("{%s.%u},", netfs->name, netfs->version);
-
- klen = strlen(netfs->name);
- if (klen > bufmax)
- return 0;
-
- memcpy(buffer, netfs->name, klen);
- return klen;
-}
-
-/*
- * get the auxiliary data for an FSDEF index record - this is the index
- * structure version number of the netfs for which this version is created
- */
-static uint16_t fscache_fsdef_netfs_get_aux(const void *cookie_netfs_data,
- void *buffer, uint16_t bufmax)
-{
- const struct fscache_netfs *netfs = cookie_netfs_data;
- unsigned dlen;
-
- _enter("{%s.%u},", netfs->name, netfs->version);
-
- dlen = sizeof(uint32_t);
- if (dlen > bufmax)
- return 0;
-
- memcpy(buffer, &netfs->version, dlen);
- return dlen;
-}
-
-/*
* check that the index structure version number stored in the auxiliary data
* matches the one the netfs gave us
*/
static enum fscache_checkaux fscache_fsdef_netfs_check_aux(
void *cookie_netfs_data,
const void *data,
- uint16_t datalen)
+ uint16_t datalen,
+ loff_t object_size)
{
struct fscache_netfs *netfs = cookie_netfs_data;
uint32_t version;
diff --git a/fs/fscache/histogram.c b/fs/fscache/histogram.c
index 15a3d042247e..9a13e9e15b69 100644
--- a/fs/fscache/histogram.c
+++ b/fs/fscache/histogram.c
@@ -83,24 +83,9 @@ static void fscache_histogram_stop(struct seq_file *m, void *v)
{
}
-static const struct seq_operations fscache_histogram_ops = {
+const struct seq_operations fscache_histogram_ops = {
.start = fscache_histogram_start,
.stop = fscache_histogram_stop,
.next = fscache_histogram_next,
.show = fscache_histogram_show,
};
-
-/*
- * open "/proc/fs/fscache/histogram" to provide latency data
- */
-static int fscache_histogram_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &fscache_histogram_ops);
-}
-
-const struct file_operations fscache_histogram_fops = {
- .open = fscache_histogram_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 0ff4b49a0037..f83328a7f048 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -29,7 +29,9 @@
#define pr_fmt(fmt) "FS-Cache: " fmt
#include <linux/fscache-cache.h>
+#include <trace/events/fscache.h>
#include <linux/sched.h>
+#include <linux/seq_file.h>
#define FSCACHE_MIN_THREADS 4
#define FSCACHE_MAX_THREADS 32
@@ -48,8 +50,16 @@ extern struct fscache_cache *fscache_select_cache_for_object(
*/
extern struct kmem_cache *fscache_cookie_jar;
+extern void fscache_free_cookie(struct fscache_cookie *);
extern void fscache_cookie_init_once(void *);
-extern void __fscache_cookie_put(struct fscache_cookie *);
+extern struct fscache_cookie *fscache_alloc_cookie(struct fscache_cookie *,
+ const struct fscache_cookie_def *,
+ const void *, size_t,
+ const void *, size_t,
+ void *, loff_t);
+extern struct fscache_cookie *fscache_hash_cookie(struct fscache_cookie *);
+extern void fscache_cookie_put(struct fscache_cookie *,
+ enum fscache_cookie_trace);
/*
* fsdef.c
@@ -75,7 +85,7 @@ static inline void fscache_hist(atomic_t histogram[], unsigned long start_jif)
atomic_inc(&histogram[jif]);
}
-extern const struct file_operations fscache_histogram_fops;
+extern const struct seq_operations fscache_histogram_ops;
#else
#define fscache_hist(hist, start_jif) do {} while (0)
@@ -285,7 +295,7 @@ static inline void fscache_stat_d(atomic_t *stat)
#define __fscache_stat(stat) (stat)
-extern const struct file_operations fscache_stats_fops;
+int fscache_stats_show(struct seq_file *m, void *v);
#else
#define __fscache_stat(stat) (NULL)
@@ -311,14 +321,12 @@ static inline void fscache_raise_event(struct fscache_object *object,
fscache_enqueue_object(object);
}
-/*
- * drop a reference to a cookie
- */
-static inline void fscache_cookie_put(struct fscache_cookie *cookie)
+static inline void fscache_cookie_get(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where)
{
- BUG_ON(atomic_read(&cookie->usage) <= 0);
- if (atomic_dec_and_test(&cookie->usage))
- __fscache_cookie_put(cookie);
+ int usage = atomic_inc_return(&cookie->usage);
+
+ trace_fscache_cookie(cookie, where, usage);
}
/*
@@ -342,6 +350,27 @@ void fscache_put_context(struct fscache_cookie *cookie, void *context)
cookie->def->put_context(cookie->netfs_data, context);
}
+/*
+ * Update the auxiliary data on a cookie.
+ */
+static inline
+void fscache_update_aux(struct fscache_cookie *cookie, const void *aux_data)
+{
+ void *p;
+
+ if (!aux_data)
+ return;
+ if (cookie->aux_len <= sizeof(cookie->inline_aux))
+ p = cookie->inline_aux;
+ else
+ p = cookie->aux;
+
+ if (memcmp(p, aux_data, cookie->aux_len) != 0) {
+ memcpy(p, aux_data, cookie->aux_len);
+ set_bit(FSCACHE_COOKIE_AUX_UPDATED, &cookie->flags);
+ }
+}
+
/*****************************************************************************/
/*
* debug tracing
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index 249968dcbf5c..7dce110bf17d 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -16,6 +16,7 @@
#include <linux/completion.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
+#define CREATE_TRACE_POINTS
#include "internal.h"
MODULE_DESCRIPTION("FS Cache Manager");
diff --git a/fs/fscache/netfs.c b/fs/fscache/netfs.c
index a8aa00be4444..c2f605483cc5 100644
--- a/fs/fscache/netfs.c
+++ b/fs/fscache/netfs.c
@@ -14,69 +14,51 @@
#include <linux/slab.h>
#include "internal.h"
-static LIST_HEAD(fscache_netfs_list);
-
/*
* register a network filesystem for caching
*/
int __fscache_register_netfs(struct fscache_netfs *netfs)
{
- struct fscache_netfs *ptr;
- struct fscache_cookie *cookie;
- int ret;
+ struct fscache_cookie *candidate, *cookie;
_enter("{%s}", netfs->name);
- INIT_LIST_HEAD(&netfs->link);
-
/* allocate a cookie for the primary index */
- cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
-
- if (!cookie) {
+ candidate = fscache_alloc_cookie(&fscache_fsdef_index,
+ &fscache_fsdef_netfs_def,
+ netfs->name, strlen(netfs->name),
+ &netfs->version, sizeof(netfs->version),
+ netfs, 0);
+ if (!candidate) {
_leave(" = -ENOMEM");
return -ENOMEM;
}
- /* initialise the primary index cookie */
- atomic_set(&cookie->usage, 1);
- atomic_set(&cookie->n_children, 0);
- atomic_set(&cookie->n_active, 1);
-
- cookie->def = &fscache_fsdef_netfs_def;
- cookie->parent = &fscache_fsdef_index;
- cookie->netfs_data = netfs;
- cookie->flags = 1 << FSCACHE_COOKIE_ENABLED;
-
- spin_lock_init(&cookie->lock);
- spin_lock_init(&cookie->stores_lock);
- INIT_HLIST_HEAD(&cookie->backing_objects);
+ candidate->flags = 1 << FSCACHE_COOKIE_ENABLED;
/* check the netfs type is not already present */
- down_write(&fscache_addremove_sem);
-
- ret = -EEXIST;
- list_for_each_entry(ptr, &fscache_netfs_list, link) {
- if (strcmp(ptr->name, netfs->name) == 0)
- goto already_registered;
+ cookie = fscache_hash_cookie(candidate);
+ if (!cookie)
+ goto already_registered;
+ if (cookie != candidate) {
+ trace_fscache_cookie(candidate, fscache_cookie_discard, 1);
+ fscache_free_cookie(candidate);
}
- atomic_inc(&cookie->parent->usage);
+ fscache_cookie_get(cookie->parent, fscache_cookie_get_register_netfs);
atomic_inc(&cookie->parent->n_children);
netfs->primary_index = cookie;
- list_add(&netfs->link, &fscache_netfs_list);
- ret = 0;
pr_notice("Netfs '%s' registered for caching\n", netfs->name);
+ trace_fscache_netfs(netfs);
+ _leave(" = 0");
+ return 0;
already_registered:
- up_write(&fscache_addremove_sem);
-
- if (ret < 0)
- kmem_cache_free(fscache_cookie_jar, cookie);
-
- _leave(" = %d", ret);
- return ret;
+ fscache_cookie_put(candidate, fscache_cookie_put_dup_netfs);
+ _leave(" = -EEXIST");
+ return -EEXIST;
}
EXPORT_SYMBOL(__fscache_register_netfs);
@@ -88,15 +70,8 @@ void __fscache_unregister_netfs(struct fscache_netfs *netfs)
{
_enter("{%s.%u}", netfs->name, netfs->version);
- down_write(&fscache_addremove_sem);
-
- list_del(&netfs->link);
- fscache_relinquish_cookie(netfs->primary_index, 0);
-
- up_write(&fscache_addremove_sem);
-
- pr_notice("Netfs '%s' unregistered from caching\n",
- netfs->name);
+ fscache_relinquish_cookie(netfs->primary_index, NULL, false);
+ pr_notice("Netfs '%s' unregistered from caching\n", netfs->name);
_leave("");
}
diff --git a/fs/fscache/object-list.c b/fs/fscache/object-list.c
index 0438d4cd91ef..43e6e28c164f 100644
--- a/fs/fscache/object-list.c
+++ b/fs/fscache/object-list.c
@@ -36,8 +36,6 @@ struct fscache_objlist_data {
#define FSCACHE_OBJLIST_CONFIG_NOEVENTS 0x00000800 /* show objects without no events */
#define FSCACHE_OBJLIST_CONFIG_WORK 0x00001000 /* show objects with work */
#define FSCACHE_OBJLIST_CONFIG_NOWORK 0x00002000 /* show objects without work */
-
- u8 buf[512]; /* key and aux data buffer */
};
/*
@@ -170,7 +168,7 @@ static int fscache_objlist_show(struct seq_file *m, void *v)
struct fscache_cookie *cookie;
unsigned long config = data->config;
char _type[3], *type;
- u8 *buf = data->buf, *p;
+ u8 *p;
if ((unsigned long) v == 1) {
seq_puts(m, "OBJECT PARENT STAT CHLDN OPS OOP IPR EX READS"
@@ -254,7 +252,7 @@ static int fscache_objlist_show(struct seq_file *m, void *v)
if (fscache_use_cookie(obj)) {
uint16_t keylen = 0, auxlen = 0;
- switch (cookie->def->type) {
+ switch (cookie->type) {
case 0:
type = "IX";
break;
@@ -263,7 +261,7 @@ static int fscache_objlist_show(struct seq_file *m, void *v)
break;
default:
snprintf(_type, sizeof(_type), "%02u",
- cookie->def->type);
+ cookie->type);
type = _type;
break;
}
@@ -274,30 +272,30 @@ static int fscache_objlist_show(struct seq_file *m, void *v)
cookie->flags,
cookie->netfs_data);
- if (cookie->def->get_key &&
- config & FSCACHE_OBJLIST_CONFIG_KEY)
- keylen = cookie->def->get_key(cookie->netfs_data,
- buf, 400);
+ if (config & FSCACHE_OBJLIST_CONFIG_KEY)
+ keylen = cookie->key_len;
- if (cookie->def->get_aux &&
- config & FSCACHE_OBJLIST_CONFIG_AUX)
- auxlen = cookie->def->get_aux(cookie->netfs_data,
- buf + keylen, 512 - keylen);
- fscache_unuse_cookie(obj);
+ if (config & FSCACHE_OBJLIST_CONFIG_AUX)
+ auxlen = cookie->aux_len;
if (keylen > 0 || auxlen > 0) {
seq_puts(m, " ");
- for (p = buf; keylen > 0; keylen--)
+ p = keylen <= sizeof(cookie->inline_key) ?
+ cookie->inline_key : cookie->key;
+ for (; keylen > 0; keylen--)
seq_printf(m, "%02x", *p++);
if (auxlen > 0) {
if (config & FSCACHE_OBJLIST_CONFIG_KEY)
seq_puts(m, ", ");
+ p = auxlen <= sizeof(cookie->inline_aux) ?
+ cookie->inline_aux : cookie->aux;
for (; auxlen > 0; auxlen--)
seq_printf(m, "%02x", *p++);
}
}
seq_puts(m, "\n");
+ fscache_unuse_cookie(obj);
} else {
seq_puts(m, "<no_netfs>\n");
}
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index 7a182c87f378..20e0d0a4dc8c 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -138,10 +138,13 @@ static const struct fscache_transition fscache_osm_run_oob[] = {
{ 0, NULL }
};
-static int fscache_get_object(struct fscache_object *);
-static void fscache_put_object(struct fscache_object *);
+static int fscache_get_object(struct fscache_object *,
+ enum fscache_obj_ref_trace);
+static void fscache_put_object(struct fscache_object *,
+ enum fscache_obj_ref_trace);
static bool fscache_enqueue_dependents(struct fscache_object *, int);
static void fscache_dequeue_object(struct fscache_object *);
+static void fscache_update_aux_data(struct fscache_object *);
/*
* we need to notify the parent when an op completes that we had outstanding
@@ -170,6 +173,7 @@ static void fscache_object_sm_dispatcher(struct fscache_object *object)
const struct fscache_transition *t;
const struct fscache_state *state, *new_state;
unsigned long events, event_mask;
+ bool oob;
int event = -1;
ASSERT(object != NULL);
@@ -188,6 +192,7 @@ restart_masked:
if (events & object->oob_event_mask) {
_debug("{OBJ%x} oob %lx",
object->debug_id, events & object->oob_event_mask);
+ oob = true;
for (t = object->oob_table; t->events; t++) {
if (events & t->events) {
state = t->transit_to;
@@ -199,6 +204,7 @@ restart_masked:
}
}
}
+ oob = false;
/* Wait states are just transition tables */
if (!state->work) {
@@ -207,6 +213,8 @@ restart_masked:
if (events & t->events) {
new_state = t->transit_to;
event = fls(events & t->events) - 1;
+ trace_fscache_osm(object, state,
+ true, false, event);
clear_bit(event, &object->events);
_debug("{OBJ%x} ev %d: %s -> %s",
object->debug_id, event,
@@ -226,6 +234,7 @@ restart_masked:
execute_work_state:
_debug("{OBJ%x} exec %s", object->debug_id, state->name);
+ trace_fscache_osm(object, state, false, oob, event);
new_state = state->work(object, event);
event = -1;
if (new_state == NO_TRANSIT) {
@@ -279,7 +288,7 @@ static void fscache_object_work_func(struct work_struct *work)
start = jiffies;
fscache_object_sm_dispatcher(object);
fscache_hist(fscache_objs_histogram, start);
- fscache_put_object(object);
+ fscache_put_object(object, fscache_obj_put_work);
}
/**
@@ -397,7 +406,7 @@ static const struct fscache_state *fscache_initialise_object(struct fscache_obje
fscache_stat(&fscache_n_cop_grab_object);
success = false;
if (fscache_object_is_live(parent) &&
- object->cache->ops->grab_object(object)) {
+ object->cache->ops->grab_object(object, fscache_obj_get_add_to_deps)) {
list_add(&object->dep_link, &parent->dependents);
success = true;
}
@@ -703,6 +712,11 @@ static const struct fscache_state *fscache_drop_object(struct fscache_object *ob
ASSERT(cookie != NULL);
ASSERT(!hlist_unhashed(&object->cookie_link));
+ if (test_bit(FSCACHE_COOKIE_AUX_UPDATED, &cookie->flags)) {
+ _debug("final update");
+ fscache_update_aux_data(object);
+ }
+
/* Make sure the cookie no longer points here and that the netfs isn't
* waiting for us.
*/
@@ -745,7 +759,7 @@ static const struct fscache_state *fscache_drop_object(struct fscache_object *ob
}
/* this just shifts the object release to the work processor */
- fscache_put_object(object);
+ fscache_put_object(object, fscache_obj_put_drop_obj);
fscache_stat(&fscache_n_object_dead);
_leave("");
@@ -755,12 +769,13 @@ static const struct fscache_state *fscache_drop_object(struct fscache_object *ob
/*
* get a ref on an object
*/
-static int fscache_get_object(struct fscache_object *object)
+static int fscache_get_object(struct fscache_object *object,
+ enum fscache_obj_ref_trace why)
{
int ret;
fscache_stat(&fscache_n_cop_grab_object);
- ret = object->cache->ops->grab_object(object) ? 0 : -EAGAIN;
+ ret = object->cache->ops->grab_object(object, why) ? 0 : -EAGAIN;
fscache_stat_d(&fscache_n_cop_grab_object);
return ret;
}
@@ -768,10 +783,11 @@ static int fscache_get_object(struct fscache_object *object)
/*
* Discard a ref on an object
*/
-static void fscache_put_object(struct fscache_object *object)
+static void fscache_put_object(struct fscache_object *object,
+ enum fscache_obj_ref_trace why)
{
fscache_stat(&fscache_n_cop_put_object);
- object->cache->ops->put_object(object);
+ object->cache->ops->put_object(object, why);
fscache_stat_d(&fscache_n_cop_put_object);
}
@@ -786,7 +802,7 @@ void fscache_object_destroy(struct fscache_object *object)
fscache_objlist_remove(object);
/* We can get rid of the cookie now */
- fscache_cookie_put(object->cookie);
+ fscache_cookie_put(object->cookie, fscache_cookie_put_object);
object->cookie = NULL;
}
EXPORT_SYMBOL(fscache_object_destroy);
@@ -798,7 +814,7 @@ void fscache_enqueue_object(struct fscache_object *object)
{
_enter("{OBJ%x}", object->debug_id);
- if (fscache_get_object(object) >= 0) {
+ if (fscache_get_object(object, fscache_obj_get_queue) >= 0) {
wait_queue_head_t *cong_wq =
&get_cpu_var(fscache_object_cong_wait);
@@ -806,7 +822,7 @@ void fscache_enqueue_object(struct fscache_object *object)
if (fscache_object_congested())
wake_up(cong_wq);
} else
- fscache_put_object(object);
+ fscache_put_object(object, fscache_obj_put_queue);
put_cpu_var(fscache_object_cong_wait);
}
@@ -866,7 +882,7 @@ static bool fscache_enqueue_dependents(struct fscache_object *object, int event)
list_del_init(&dep->dep_link);
fscache_raise_event(dep, event);
- fscache_put_object(dep);
+ fscache_put_object(dep, fscache_obj_put_enq_dep);
if (!list_empty(&object->dependents) && need_resched()) {
ret = false;
@@ -906,7 +922,8 @@ static void fscache_dequeue_object(struct fscache_object *object)
* and creation).
*/
enum fscache_checkaux fscache_check_aux(struct fscache_object *object,
- const void *data, uint16_t datalen)
+ const void *data, uint16_t datalen,
+ loff_t object_size)
{
enum fscache_checkaux result;
@@ -916,7 +933,7 @@ enum fscache_checkaux fscache_check_aux(struct fscache_object *object,
}
result = object->cookie->def->check_aux(object->cookie->netfs_data,
- data, datalen);
+ data, datalen, object_size);
switch (result) {
/* entry okay as is */
case FSCACHE_CHECKAUX_OKAY:
@@ -956,7 +973,7 @@ static const struct fscache_state *_fscache_invalidate_object(struct fscache_obj
* retire the object instead.
*/
if (!fscache_use_cookie(object)) {
- ASSERT(object->cookie->stores.rnode == NULL);
+ ASSERT(radix_tree_empty(&object->cookie->stores));
set_bit(FSCACHE_OBJECT_RETIRED, &object->flags);
_leave(" [no cookie]");
return transit_to(KILL_OBJECT);
@@ -972,11 +989,12 @@ static const struct fscache_state *_fscache_invalidate_object(struct fscache_obj
if (!op)
goto nomem;
- fscache_operation_init(op, object->cache->ops->invalidate_object,
+ fscache_operation_init(cookie, op, object->cache->ops->invalidate_object,
NULL, NULL);
op->flags = FSCACHE_OP_ASYNC |
(1 << FSCACHE_OP_EXCLUSIVE) |
(1 << FSCACHE_OP_UNUSE_COOKIE);
+ trace_fscache_page_op(cookie, NULL, op, fscache_page_op_invalidate);
spin_lock(&cookie->lock);
if (fscache_submit_exclusive_op(object, op) < 0)
@@ -1026,6 +1044,17 @@ static const struct fscache_state *fscache_invalidate_object(struct fscache_obje
}
/*
+ * Update auxiliary data.
+ */
+static void fscache_update_aux_data(struct fscache_object *object)
+{
+ fscache_stat(&fscache_n_updates_run);
+ fscache_stat(&fscache_n_cop_update_object);
+ object->cache->ops->update_object(object);
+ fscache_stat_d(&fscache_n_cop_update_object);
+}
+
+/*
* Asynchronously update an object.
*/
static const struct fscache_state *fscache_update_object(struct fscache_object *object,
@@ -1033,10 +1062,7 @@ static const struct fscache_state *fscache_update_object(struct fscache_object *
{
_enter("{OBJ%x},%d", object->debug_id, event);
- fscache_stat(&fscache_n_updates_run);
- fscache_stat(&fscache_n_cop_update_object);
- object->cache->ops->update_object(object);
- fscache_stat_d(&fscache_n_cop_update_object);
+ fscache_update_aux_data(object);
_leave("");
return transit_to(WAIT_FOR_CMD);
diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
index de67745e1cd7..e30c5975ea58 100644
--- a/fs/fscache/operation.c
+++ b/fs/fscache/operation.c
@@ -32,7 +32,8 @@ static void fscache_operation_dummy_cancel(struct fscache_operation *op)
* Do basic initialisation of an operation. The caller must still set flags,
* object and processor if needed.
*/
-void fscache_operation_init(struct fscache_operation *op,
+void fscache_operation_init(struct fscache_cookie *cookie,
+ struct fscache_operation *op,
fscache_operation_processor_t processor,
fscache_operation_cancel_t cancel,
fscache_operation_release_t release)
@@ -46,6 +47,7 @@ void fscache_operation_init(struct fscache_operation *op,
op->release = release;
INIT_LIST_HEAD(&op->pend_link);
fscache_stat(&fscache_n_op_initialised);
+ trace_fscache_op(cookie, op, fscache_op_init);
}
EXPORT_SYMBOL(fscache_operation_init);
@@ -59,6 +61,8 @@ EXPORT_SYMBOL(fscache_operation_init);
*/
void fscache_enqueue_operation(struct fscache_operation *op)
{
+ struct fscache_cookie *cookie = op->object->cookie;
+
_enter("{OBJ%x OP%x,%u}",
op->object->debug_id, op->debug_id, atomic_read(&op->usage));
@@ -71,12 +75,14 @@ void fscache_enqueue_operation(struct fscache_operation *op)
fscache_stat(&fscache_n_op_enqueue);
switch (op->flags & FSCACHE_OP_TYPE) {
case FSCACHE_OP_ASYNC:
+ trace_fscache_op(cookie, op, fscache_op_enqueue_async);
_debug("queue async");
atomic_inc(&op->usage);
if (!queue_work(fscache_op_wq, &op->work))
fscache_put_operation(op);
break;
case FSCACHE_OP_MYTHREAD:
+ trace_fscache_op(cookie, op, fscache_op_enqueue_mythread);
_debug("queue for caller's attention");
break;
default:
@@ -101,6 +107,8 @@ static void fscache_run_op(struct fscache_object *object,
wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
if (op->processor)
fscache_enqueue_operation(op);
+ else
+ trace_fscache_op(object->cookie, op, fscache_op_run);
fscache_stat(&fscache_n_op_run);
}
@@ -155,6 +163,8 @@ int fscache_submit_exclusive_op(struct fscache_object *object,
_enter("{OBJ%x OP%x},", object->debug_id, op->debug_id);
+ trace_fscache_op(object->cookie, op, fscache_op_submit_ex);
+
ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED);
ASSERTCMP(atomic_read(&op->usage), >, 0);
@@ -240,6 +250,8 @@ int fscache_submit_op(struct fscache_object *object,
_enter("{OBJ%x OP%x},{%u}",
object->debug_id, op->debug_id, atomic_read(&op->usage));
+ trace_fscache_op(object->cookie, op, fscache_op_submit);
+
ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED);
ASSERTCMP(atomic_read(&op->usage), >, 0);
@@ -357,6 +369,8 @@ int fscache_cancel_op(struct fscache_operation *op,
_enter("OBJ%x OP%x}", op->object->debug_id, op->debug_id);
+ trace_fscache_op(object->cookie, op, fscache_op_cancel);
+
ASSERTCMP(op->state, >=, FSCACHE_OP_ST_PENDING);
ASSERTCMP(op->state, !=, FSCACHE_OP_ST_CANCELLED);
ASSERTCMP(atomic_read(&op->usage), >, 0);
@@ -419,6 +433,8 @@ void fscache_cancel_all_ops(struct fscache_object *object)
fscache_stat(&fscache_n_op_cancelled);
list_del_init(&op->pend_link);
+ trace_fscache_op(object->cookie, op, fscache_op_cancel_all);
+
ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING);
op->cancel(op);
op->state = FSCACHE_OP_ST_CANCELLED;
@@ -454,9 +470,11 @@ void fscache_op_complete(struct fscache_operation *op, bool cancelled)
spin_lock(&object->lock);
if (!cancelled) {
+ trace_fscache_op(object->cookie, op, fscache_op_completed);
op->state = FSCACHE_OP_ST_COMPLETE;
} else {
op->cancel(op);
+ trace_fscache_op(object->cookie, op, fscache_op_cancelled);
op->state = FSCACHE_OP_ST_CANCELLED;
}
@@ -488,6 +506,8 @@ void fscache_put_operation(struct fscache_operation *op)
if (!atomic_dec_and_test(&op->usage))
return;
+ trace_fscache_op(op->object ? op->object->cookie : NULL, op, fscache_op_put);
+
_debug("PUT OP");
ASSERTIFCMP(op->state != FSCACHE_OP_ST_INITIALISED &&
op->state != FSCACHE_OP_ST_COMPLETE,
@@ -563,6 +583,8 @@ void fscache_operation_gc(struct work_struct *work)
spin_unlock(&cache->op_gc_list_lock);
object = op->object;
+ trace_fscache_op(object->cookie, op, fscache_op_gc);
+
spin_lock(&object->lock);
_debug("GC DEFERRED REL OBJ%x OP%x",
@@ -601,6 +623,8 @@ void fscache_op_work_func(struct work_struct *work)
_enter("{OBJ%x OP%x,%d}",
op->object->debug_id, op->debug_id, atomic_read(&op->usage));
+ trace_fscache_op(op->object->cookie, op, fscache_op_work);
+
ASSERT(op->processor != NULL);
start = jiffies;
op->processor(op);
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index 961029e04027..111349f67d98 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -27,6 +27,7 @@ bool __fscache_check_page_write(struct fscache_cookie *cookie, struct page *page
rcu_read_lock();
val = radix_tree_lookup(&cookie->stores, page->index);
rcu_read_unlock();
+ trace_fscache_check_page(cookie, page, val, 0);
return val != NULL;
}
@@ -39,6 +40,8 @@ void __fscache_wait_on_page_write(struct fscache_cookie *cookie, struct page *pa
{
wait_queue_head_t *wq = bit_waitqueue(&cookie->flags, 0);
+ trace_fscache_page(cookie, page, fscache_page_write_wait);
+
wait_event(*wq, !__fscache_check_page_write(cookie, page));
}
EXPORT_SYMBOL(__fscache_wait_on_page_write);
@@ -69,6 +72,8 @@ bool __fscache_maybe_release_page(struct fscache_cookie *cookie,
_enter("%p,%p,%x", cookie, page, gfp);
+ trace_fscache_page(cookie, page, fscache_page_maybe_release);
+
try_again:
rcu_read_lock();
val = radix_tree_lookup(&cookie->stores, page->index);
@@ -101,6 +106,7 @@ try_again:
}
xpage = radix_tree_delete(&cookie->stores, page->index);
+ trace_fscache_page(cookie, page, fscache_page_radix_delete);
spin_unlock(&cookie->stores_lock);
if (xpage) {
@@ -112,6 +118,7 @@ try_again:
}
wake_up_bit(&cookie->flags, 0);
+ trace_fscache_wake_cookie(cookie);
if (xpage)
put_page(xpage);
__fscache_uncache_page(cookie, page);
@@ -144,7 +151,7 @@ static void fscache_end_page_write(struct fscache_object *object,
struct page *page)
{
struct fscache_cookie *cookie;
- struct page *xpage = NULL;
+ struct page *xpage = NULL, *val;
spin_lock(&object->lock);
cookie = object->cookie;
@@ -154,13 +161,24 @@ static void fscache_end_page_write(struct fscache_object *object,
spin_lock(&cookie->stores_lock);
radix_tree_tag_clear(&cookie->stores, page->index,
FSCACHE_COOKIE_STORING_TAG);
+ trace_fscache_page(cookie, page, fscache_page_radix_clear_store);
if (!radix_tree_tag_get(&cookie->stores, page->index,
FSCACHE_COOKIE_PENDING_TAG)) {
fscache_stat(&fscache_n_store_radix_deletes);
xpage = radix_tree_delete(&cookie->stores, page->index);
+ trace_fscache_page(cookie, page, fscache_page_radix_delete);
+ trace_fscache_page(cookie, page, fscache_page_write_end);
+
+ val = radix_tree_lookup(&cookie->stores, page->index);
+ trace_fscache_check_page(cookie, page, val, 1);
+ } else {
+ trace_fscache_page(cookie, page, fscache_page_write_end_pend);
}
spin_unlock(&cookie->stores_lock);
wake_up_bit(&cookie->flags, 0);
+ trace_fscache_wake_cookie(cookie);
+ } else {
+ trace_fscache_page(cookie, page, fscache_page_write_end_noc);
}
spin_unlock(&object->lock);
if (xpage)
@@ -185,9 +203,11 @@ static void fscache_attr_changed_op(struct fscache_operation *op)
fscache_stat_d(&fscache_n_cop_attr_changed);
if (ret < 0)
fscache_abort_object(object);
+ fscache_op_complete(op, ret < 0);
+ } else {
+ fscache_op_complete(op, true);
}
- fscache_op_complete(op, true);
_leave("");
}
@@ -213,7 +233,8 @@ int __fscache_attr_changed(struct fscache_cookie *cookie)
return -ENOMEM;
}
- fscache_operation_init(op, fscache_attr_changed_op, NULL, NULL);
+ fscache_operation_init(cookie, op, fscache_attr_changed_op, NULL, NULL);
+ trace_fscache_page_op(cookie, NULL, op, fscache_page_op_attr_changed);
op->flags = FSCACHE_OP_ASYNC |
(1 << FSCACHE_OP_EXCLUSIVE) |
(1 << FSCACHE_OP_UNUSE_COOKIE);
@@ -297,7 +318,7 @@ static struct fscache_retrieval *fscache_alloc_retrieval(
return NULL;
}
- fscache_operation_init(&op->op, NULL,
+ fscache_operation_init(cookie, &op->op, NULL,
fscache_do_cancel_retrieval,
fscache_release_retrieval_op);
op->op.flags = FSCACHE_OP_MYTHREAD |
@@ -368,6 +389,7 @@ int fscache_wait_for_operation_activation(struct fscache_object *object,
fscache_stat(stat_op_waits);
if (wait_on_bit(&op->flags, FSCACHE_OP_WAITING,
TASK_INTERRUPTIBLE) != 0) {
+ trace_fscache_op(object->cookie, op, fscache_op_signal);
ret = fscache_cancel_op(op, false);
if (ret == 0)
return -ERESTARTSYS;
@@ -389,6 +411,7 @@ check_if_dead:
if (unlikely(fscache_object_is_dying(object) ||
fscache_cache_is_broken(object))) {
enum fscache_operation_state state = op->state;
+ trace_fscache_op(object->cookie, op, fscache_op_signal);
fscache_cancel_op(op, true);
if (stat_object_dead)
fscache_stat(stat_object_dead);
@@ -443,6 +466,7 @@ int __fscache_read_or_alloc_page(struct fscache_cookie *cookie,
return -ENOMEM;
}
atomic_set(&op->n_pages, 1);
+ trace_fscache_page_op(cookie, page, &op->op, fscache_page_op_retr_one);
spin_lock(&cookie->lock);
@@ -571,6 +595,7 @@ int __fscache_read_or_alloc_pages(struct fscache_cookie *cookie,
if (!op)
return -ENOMEM;
atomic_set(&op->n_pages, *nr_pages);
+ trace_fscache_page_op(cookie, NULL, &op->op, fscache_page_op_retr_multi);
spin_lock(&cookie->lock);
@@ -682,6 +707,7 @@ int __fscache_alloc_page(struct fscache_cookie *cookie,
if (!op)
return -ENOMEM;
atomic_set(&op->n_pages, 1);
+ trace_fscache_page_op(cookie, page, &op->op, fscache_page_op_alloc_one);
spin_lock(&cookie->lock);
@@ -776,15 +802,17 @@ static void fscache_write_op(struct fscache_operation *_op)
_enter("{OP%x,%d}", op->op.debug_id, atomic_read(&op->op.usage));
+again:
spin_lock(&object->lock);
cookie = object->cookie;
if (!fscache_object_is_active(object)) {
- /* If we get here, then the on-disk cache object likely longer
- * exists, so we should just cancel this write operation.
+ /* If we get here, then the on-disk cache object likely no
+ * longer exists, so we should just cancel this write
+ * operation.
*/
spin_unlock(&object->lock);
- fscache_op_complete(&op->op, false);
+ fscache_op_complete(&op->op, true);
_leave(" [inactive]");
return;
}
@@ -797,7 +825,7 @@ static void fscache_write_op(struct fscache_operation *_op)
* cancel this write operation.
*/
spin_unlock(&object->lock);
- fscache_op_complete(&op->op, false);
+ fscache_op_complete(&op->op, true);
_leave(" [cancel] op{f=%lx s=%u} obj{s=%s f=%lx}",
_op->flags, _op->state, object->state->short_name,
object->flags);
@@ -809,30 +837,33 @@ static void fscache_write_op(struct fscache_operation *_op)
fscache_stat(&fscache_n_store_calls);
/* find a page to store */
+ results[0] = NULL;
page = NULL;
n = radix_tree_gang_lookup_tag(&cookie->stores, results, 0, 1,
FSCACHE_COOKIE_PENDING_TAG);
+ trace_fscache_gang_lookup(cookie, &op->op, results, n, op->store_limit);
if (n != 1)
goto superseded;
page = results[0];
_debug("gang %d [%lx]", n, page->index);
- if (page->index >= op->store_limit) {
- fscache_stat(&fscache_n_store_pages_over_limit);
- goto superseded;
- }
radix_tree_tag_set(&cookie->stores, page->index,
FSCACHE_COOKIE_STORING_TAG);
radix_tree_tag_clear(&cookie->stores, page->index,
FSCACHE_COOKIE_PENDING_TAG);
+ trace_fscache_page(cookie, page, fscache_page_radix_pend2store);
spin_unlock(&cookie->stores_lock);
spin_unlock(&object->lock);
+ if (page->index >= op->store_limit)
+ goto discard_page;
+
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);
+ trace_fscache_wrote_page(cookie, page, &op->op, ret);
fscache_end_page_write(object, page);
if (ret < 0) {
fscache_abort_object(object);
@@ -844,6 +875,12 @@ static void fscache_write_op(struct fscache_operation *_op)
_leave("");
return;
+discard_page:
+ fscache_stat(&fscache_n_store_pages_over_limit);
+ trace_fscache_wrote_page(cookie, page, &op->op, -ENOBUFS);
+ fscache_end_page_write(object, page);
+ goto again;
+
superseded:
/* this writer is going away and there aren't any more things to
* write */
@@ -851,7 +888,7 @@ superseded:
spin_unlock(&cookie->stores_lock);
clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
spin_unlock(&object->lock);
- fscache_op_complete(&op->op, true);
+ fscache_op_complete(&op->op, false);
_leave("");
}
@@ -879,6 +916,8 @@ void fscache_invalidate_writes(struct fscache_cookie *cookie)
for (i = n - 1; i >= 0; i--) {
page = results[i];
radix_tree_delete(&cookie->stores, page->index);
+ trace_fscache_page(cookie, page, fscache_page_radix_delete);
+ trace_fscache_page(cookie, page, fscache_page_inval);
}
spin_unlock(&cookie->stores_lock);
@@ -888,6 +927,7 @@ void fscache_invalidate_writes(struct fscache_cookie *cookie)
}
wake_up_bit(&cookie->flags, 0);
+ trace_fscache_wake_cookie(cookie);
_leave("");
}
@@ -923,6 +963,7 @@ void fscache_invalidate_writes(struct fscache_cookie *cookie)
*/
int __fscache_write_page(struct fscache_cookie *cookie,
struct page *page,
+ loff_t object_size,
gfp_t gfp)
{
struct fscache_storage *op;
@@ -946,7 +987,7 @@ int __fscache_write_page(struct fscache_cookie *cookie,
if (!op)
goto nomem;
- fscache_operation_init(&op->op, fscache_write_op, NULL,
+ fscache_operation_init(cookie, &op->op, fscache_write_op, NULL,
fscache_release_write_op);
op->op.flags = FSCACHE_OP_ASYNC |
(1 << FSCACHE_OP_WAITING) |
@@ -956,6 +997,8 @@ int __fscache_write_page(struct fscache_cookie *cookie,
if (ret < 0)
goto nomem_free;
+ trace_fscache_page_op(cookie, page, &op->op, fscache_page_op_write_one);
+
ret = -ENOBUFS;
spin_lock(&cookie->lock);
@@ -967,9 +1010,15 @@ int __fscache_write_page(struct fscache_cookie *cookie,
if (test_bit(FSCACHE_IOERROR, &object->cache->flags))
goto nobufs;
+ trace_fscache_page(cookie, page, fscache_page_write);
+
/* add the page to the pending-storage radix tree on the backing
* object */
spin_lock(&object->lock);
+
+ if (object->store_limit_l != object_size)
+ fscache_set_store_limit(object, object_size);
+
spin_lock(&cookie->stores_lock);
_debug("store limit %llx", (unsigned long long) object->store_limit);
@@ -982,8 +1031,10 @@ int __fscache_write_page(struct fscache_cookie *cookie,
goto nobufs_unlock_obj;
}
+ trace_fscache_page(cookie, page, fscache_page_radix_insert);
radix_tree_tag_set(&cookie->stores, page->index,
FSCACHE_COOKIE_PENDING_TAG);
+ trace_fscache_page(cookie, page, fscache_page_radix_set_pend);
get_page(page);
/* we only want one writer at a time, but we do need to queue new
@@ -1026,6 +1077,7 @@ already_pending:
submit_failed:
spin_lock(&cookie->stores_lock);
radix_tree_delete(&cookie->stores, page->index);
+ trace_fscache_page(cookie, page, fscache_page_radix_delete);
spin_unlock(&cookie->stores_lock);
wake_cookie = __fscache_unuse_cookie(cookie);
put_page(page);
@@ -1072,6 +1124,8 @@ void __fscache_uncache_page(struct fscache_cookie *cookie, struct page *page)
if (!PageFsCache(page))
goto done;
+ trace_fscache_page(cookie, page, fscache_page_uncache);
+
/* get the object */
spin_lock(&cookie->lock);
@@ -1120,6 +1174,8 @@ void fscache_mark_page_cached(struct fscache_retrieval *op, struct page *page)
atomic_inc(&fscache_n_marks);
#endif
+ trace_fscache_page(cookie, page, fscache_page_cached);
+
_debug("- mark %p{%lx}", page, page->index);
if (TestSetPageFsCache(page)) {
static bool once_only;
diff --git a/fs/fscache/proc.c b/fs/fscache/proc.c
index 1d9e4951a597..49a8c90414bc 100644
--- a/fs/fscache/proc.c
+++ b/fs/fscache/proc.c
@@ -26,14 +26,14 @@ int __init fscache_proc_init(void)
goto error_dir;
#ifdef CONFIG_FSCACHE_STATS
- if (!proc_create("fs/fscache/stats", S_IFREG | 0444, NULL,
- &fscache_stats_fops))
+ if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
+ fscache_stats_show))
goto error_stats;
#endif
#ifdef CONFIG_FSCACHE_HISTOGRAM
- if (!proc_create("fs/fscache/histogram", S_IFREG | 0444, NULL,
- &fscache_histogram_fops))
+ if (!proc_create_seq("fs/fscache/histogram", S_IFREG | 0444, NULL,
+ &fscache_histogram_ops))
goto error_histogram;
#endif
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index 7ac6e839b065..00564a1dfd76 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -21,7 +21,6 @@
atomic_t fscache_n_op_pend;
atomic_t fscache_n_op_run;
atomic_t fscache_n_op_enqueue;
-atomic_t fscache_n_op_requeue;
atomic_t fscache_n_op_deferred_release;
atomic_t fscache_n_op_initialised;
atomic_t fscache_n_op_release;
@@ -139,7 +138,7 @@ atomic_t fscache_n_cache_culled_objects;
/*
* display the general statistics
*/
-static int fscache_stats_show(struct seq_file *m, void *v)
+int fscache_stats_show(struct seq_file *m, void *v)
{
seq_puts(m, "FS-Cache statistics\n");
@@ -285,18 +284,3 @@ static int fscache_stats_show(struct seq_file *m, void *v)
atomic_read(&fscache_n_cache_culled_objects));
return 0;
}
-
-/*
- * open "/proc/fs/fscache/stats" allowing provision of a statistical summary
- */
-static int fscache_stats_open(struct inode *inode, struct file *file)
-{
- return single_open(file, fscache_stats_show, NULL);
-}
-
-const struct file_operations fscache_stats_fops = {
- .open = fscache_stats_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-09 06:04:12 +0100