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authorDavid Howells <dhowells@redhat.com>2012-12-20 21:52:36 +0000
committerDavid Howells <dhowells@redhat.com>2012-12-20 22:04:07 +0000
commitef778e7ae67cd426c30cad43378b908f5eb0bad5 (patch)
tree4893f19487cb99e8ec0eb835ec4391d952641a9c /fs/fscache/internal.h
parent9f10523f891928330b7529da54c1a3cc65180b1a (diff)
downloadlinux-linaro-stable-ef778e7ae67cd426c30cad43378b908f5eb0bad5.tar.gz
FS-Cache: Provide proper invalidation
Provide a proper invalidation method rather than relying on the netfs retiring the cookie it has and getting a new one. The problem with this is that isn't easy for the netfs to make sure that it has completed/cancelled all its outstanding storage and retrieval operations on the cookie it is retiring. Instead, have the cache provide an invalidation method that will cancel or wait for all currently outstanding operations before invalidating the cache, and will cause new operations to queue up behind that. Whilst invalidation is in progress, some requests will be rejected until the cache can stack a barrier on the operation queue to cause new operations to be deferred behind it. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/fscache/internal.h')
-rw-r--r--fs/fscache/internal.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index f6aad48d38a8..c81179303930 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -122,11 +122,17 @@ extern int fscache_submit_exclusive_op(struct fscache_object *,
extern int fscache_submit_op(struct fscache_object *,
struct fscache_operation *);
extern int fscache_cancel_op(struct fscache_operation *);
+extern void fscache_cancel_all_ops(struct fscache_object *);
extern void fscache_abort_object(struct fscache_object *);
extern void fscache_start_operations(struct fscache_object *);
extern void fscache_operation_gc(struct work_struct *);
/*
+ * page.c
+ */
+extern void fscache_invalidate_writes(struct fscache_cookie *);
+
+/*
* proc.c
*/
#ifdef CONFIG_PROC_FS
@@ -205,6 +211,9 @@ extern atomic_t fscache_n_acquires_ok;
extern atomic_t fscache_n_acquires_nobufs;
extern atomic_t fscache_n_acquires_oom;
+extern atomic_t fscache_n_invalidates;
+extern atomic_t fscache_n_invalidates_run;
+
extern atomic_t fscache_n_updates;
extern atomic_t fscache_n_updates_null;
extern atomic_t fscache_n_updates_run;
@@ -237,6 +246,7 @@ extern atomic_t fscache_n_cop_alloc_object;
extern atomic_t fscache_n_cop_lookup_object;
extern atomic_t fscache_n_cop_lookup_complete;
extern atomic_t fscache_n_cop_grab_object;
+extern atomic_t fscache_n_cop_invalidate_object;
extern atomic_t fscache_n_cop_update_object;
extern atomic_t fscache_n_cop_drop_object;
extern atomic_t fscache_n_cop_put_object;