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| author |   David Howells <dhowells@redhat.com> | 2013-08-21 17:29:38 -0400 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2013-09-06 09:17:30 +0100 |
| commit | da9803bc8812f5bd3b26baaa90e515b843c65ff7 (patch) | |
| tree | 889b39ec88863fb46606cf345eeb4fdf8a90a67e /fs/fscache/internal.h | |
| parent | Linux 3.11 (diff) | |
| download | wireguard-linux-da9803bc8812f5bd3b26baaa90e515b843c65ff7.tar.xz wireguard-linux-da9803bc8812f5bd3b26baaa90e515b843c65ff7.zip | |
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 'fs/fscache/internal.h')
| -rw-r--r-- | fs/fscache/internal.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h index 12d505bedb5c..4226f6680b06 100644 --- a/fs/fscache/internal.h +++ b/fs/fscache/internal.h @@ -130,6 +130,12 @@ extern void fscache_operation_gc(struct work_struct *); /* * page.c */ +extern int fscache_wait_for_deferred_lookup(struct fscache_cookie *); +extern int fscache_wait_for_operation_activation(struct fscache_object *, + struct fscache_operation *, + atomic_t *, + atomic_t *, + void (*)(struct fscache_operation *)); extern void fscache_invalidate_writes(struct fscache_cookie *); /* |