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authorDavid Howells <dhowells@redhat.com>2013-08-21 17:29:38 -0400
committerDavid Howells <dhowells@redhat.com>2013-09-06 09:17:30 +0100
commitda9803bc8812f5bd3b26baaa90e515b843c65ff7 (patch)
tree889b39ec88863fb46606cf345eeb4fdf8a90a67e /include/linux/fscache-cache.h
parent6e4664525b1db28f8c4e1130957f70a94c19213e (diff)
FS-Cache: Add interface to check consistency of a cached object
Extend the fscache netfs API so that the netfs can ask as to whether a cache object is up to date with respect to its corresponding netfs object: int fscache_check_consistency(struct fscache_cookie *cookie) This will call back to the netfs to check whether the auxiliary data associated with a cookie is correct. It returns 0 if it is and -ESTALE if it isn't; it may also return -ENOMEM and -ERESTARTSYS. The backends now have to implement a mandatory operation pointer: int (*check_consistency)(struct fscache_object *object) that corresponds to the above API call. FS-Cache takes care of pinning the object and the cookie in memory and managing this call with respect to the object state. Original-author: Hongyi Jia <jiayisuse@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> cc: Hongyi Jia <jiayisuse@gmail.com> cc: Milosz Tanski <milosz@adfin.com>
Diffstat (limited to 'include/linux/fscache-cache.h')
-rw-r--r--include/linux/fscache-cache.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index a9ff9a36b86d..7823e9ef995e 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -251,6 +251,10 @@ struct fscache_cache_ops {
/* unpin an object in the cache */
void (*unpin_object)(struct fscache_object *object);
+ /* check the consistency between the backing cache and the FS-Cache
+ * cookie */
+ bool (*check_consistency)(struct fscache_operation *op);
+
/* store the updated auxiliary data on an object */
void (*update_object)(struct fscache_object *object);