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fscache: Pass object size in rather than calling back for it

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Pass the object size in to fscache_acquire_cookie() and
fscache_write_page() rather than the netfs providing a callback by which it
can be received.  This makes it easier to update the size of the object
when a new page is written that extends the object.

The current object size is also passed by fscache to the check_aux
function, obviating the need to store it in the aux data.

Signed-off-by: David Howells <[email protected]>
Acked-by: Anna Schumaker <[email protected]>
Tested-by: Steve Dickson <[email protected]>
This commit is contained in:
David Howells 2018-04-04 13:41:28 +01:00
commit ee1235a9a0
21 changed files with 127 additions and 166 deletions
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18
fs/fscache/cookie.c
View file

@ -21,7 +21,8 @@ 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);
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,
@ -61,6 +62,7 @@ struct fscache_cookie *__fscache_acquire_cookie(
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;
@ -160,7 +162,7 @@ struct fscache_cookie *__fscache_acquire_cookie(
* - we create indices on disk when we need them as an index
* may exist in multiple caches */
if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) {
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 {
atomic_dec(&parent->n_children);
@ -194,6 +196,7 @@ EXPORT_SYMBOL(__fscache_acquire_cookie);
*/
void __fscache_enable_cookie(struct fscache_cookie *cookie,
const void *aux_data,
loff_t object_size,
bool (*can_enable)(void *data),
void *data)
{
@ -215,7 +218,7 @@ void __fscache_enable_cookie(struct fscache_cookie *cookie,
/* 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);
@ -232,11 +235,11 @@ 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("");
@ -275,9 +278,6 @@ 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);
@ -287,7 +287,7 @@ 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()) */

6
fs/fscache/fsdef.c
View file

@ -16,7 +16,8 @@
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.
@ -76,7 +77,8 @@ struct fscache_cookie_def fscache_fsdef_netfs_def = {
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;

5
fs/fscache/object.c
View file

@ -922,7 +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;
@ -932,7 +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:

5
fs/fscache/page.c
View file

@ -963,6 +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;
@ -1014,6 +1015,10 @@ 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);
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);