diff options
| author | David Howells <dhowells@redhat.com> | 2021-10-20 15:26:17 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2022-01-07 09:22:19 +0000 |
| commit | bfa22da3ed652aa15acd4246fa13a0de6dbe4a59 (patch) | |
| tree | 8ff907c2502d7f1576b1db58156085b68d094b9b /include | |
| parent | 2e0c76aee25f33c482abda6224bd87732359354d (diff) | |
fscache: Provide and use cache methods to lookup/create/free a volume
Add cache methods to lookup, create and remove a volume.
Looking up or creating the volume requires the cache pinning for access;
freeing the volume requires the volume pinning for access. The
->acquire_volume() method is used to ask the cache backend to lookup and,
if necessary, create a volume; the ->free_volume() method is used to free
the resources for a volume.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819597821.215744.5225318658134989949.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906898645.143852.8537799955945956818.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967099771.1823006.1455197910571061835.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021507345.640689.4073511598838843040.stgit@warthog.procyon.org.uk/ # v4
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fscache-cache.h | 7 | ||||
| -rw-r--r-- | include/trace/events/fscache.h | 11 |
2 files changed, 17 insertions, 1 deletions
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h index f78add6e7823..a10b66ca3544 100644 --- a/include/linux/fscache-cache.h +++ b/include/linux/fscache-cache.h @@ -51,6 +51,12 @@ struct fscache_cache { struct fscache_cache_ops { /* name of cache provider */ const char *name; + + /* Acquire a volume */ + void (*acquire_volume)(struct fscache_volume *volume); + + /* Free the cache's data attached to a volume */ + void (*free_volume)(struct fscache_volume *volume); }; extern struct workqueue_struct *fscache_wq; @@ -65,6 +71,7 @@ extern int fscache_add_cache(struct fscache_cache *cache, const struct fscache_cache_ops *ops, void *cache_priv); extern void fscache_withdraw_cache(struct fscache_cache *cache); +extern void fscache_withdraw_volume(struct fscache_volume *volume); extern void fscache_end_volume_access(struct fscache_volume *volume, struct fscache_cookie *cookie, diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h index b1a962adfd16..1d576bd8112e 100644 --- a/include/trace/events/fscache.h +++ b/include/trace/events/fscache.h @@ -64,8 +64,12 @@ enum fscache_cookie_trace { }; enum fscache_access_trace { + fscache_access_acquire_volume, + fscache_access_acquire_volume_end, fscache_access_cache_pin, fscache_access_cache_unpin, + fscache_access_relinquish_volume, + fscache_access_relinquish_volume_end, fscache_access_unlive, }; @@ -96,7 +100,8 @@ enum fscache_access_trace { EM(fscache_volume_put_hash_collision, "PUT hcoll") \ EM(fscache_volume_put_relinquish, "PUT relnq") \ EM(fscache_volume_see_create_work, "SEE creat") \ - E_(fscache_volume_see_hash_wake, "SEE hwake") + EM(fscache_volume_see_hash_wake, "SEE hwake") \ + E_(fscache_volume_wait_create_work, "WAIT crea") #define fscache_cookie_traces \ EM(fscache_cookie_collision, "*COLLIDE*") \ @@ -115,8 +120,12 @@ enum fscache_access_trace { E_(fscache_cookie_see_work, "- work ") #define fscache_access_traces \ + EM(fscache_access_acquire_volume, "BEGIN acq_vol") \ + EM(fscache_access_acquire_volume_end, "END acq_vol") \ EM(fscache_access_cache_pin, "PIN cache ") \ EM(fscache_access_cache_unpin, "UNPIN cache ") \ + EM(fscache_access_relinquish_volume, "BEGIN rlq_vol") \ + EM(fscache_access_relinquish_volume_end,"END rlq_vol") \ E_(fscache_access_unlive, "END unlive ") /* |