Signed-off-by: Hongyi Jia <jiayis...@gmail.com>
Tested-by: Milosz Tanski <mil...@adfin.com>
---
fs/fscache/cookie.c | 22 ++++++++++++++++++++++
include/linux/fscache-cache.h | 4 ++++
include/linux/fscache.h | 17 +++++++++++++++++
3 files changed, 43 insertions(+)
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index 0e91a3c..bfa1d3b 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -533,6 +533,28 @@ void __fscache_relinquish_cookie(struct fscache_cookie
*cookie, int retire)
EXPORT_SYMBOL(__fscache_relinquish_cookie);
/*
+ * check the consistency between the netfs inode and the backing cache
+ *
+ * NOTE: it only serves no-index type
+ */
+bool __fscache_check_consistency(struct fscache_cookie *cookie)
+{
+ struct fscache_object *object;
+
+ if (cookie->def->type != FSCACHE_COOKIE_TYPE_DATAFILE)
+ return false;
+
+ if (hlist_empty(&cookie->backing_objects))
+ return false;
+
+ object = hlist_entry(cookie->backing_objects.first,
+ struct fscache_object, cookie_link);
+
+ return object->cache->ops->check_consistency(object);
+}
+EXPORT_SYMBOL(__fscache_check_consistency);
+
+/*
* destroy a cookie
*/
void __fscache_cookie_put(struct fscache_cookie *cookie)
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index a9ff9a3..5513342 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -302,6 +302,10 @@ struct fscache_cache_ops {
/* dissociate a cache from all the pages it was backing */
void (*dissociate_pages)(struct fscache_cache *cache);
+
+ /* check the consistency between the backing cache and the FS-Cache
+ * cookie */
+ bool (*check_consistency)(struct fscache_object *object);
};
/*
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 7a08623..7a49e8f 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -183,6 +183,7 @@ extern struct fscache_cookie *__fscache_acquire_cookie(
const struct fscache_cookie_def *,
void *);
extern void __fscache_relinquish_cookie(struct fscache_cookie *, int);
+extern bool __fscache_check_consistency(struct fscache_cookie *);
extern void __fscache_update_cookie(struct fscache_cookie *);
extern int __fscache_attr_changed(struct fscache_cookie *);
extern void __fscache_invalidate(struct fscache_cookie *);
@@ -326,6 +327,22 @@ void fscache_relinquish_cookie(struct fscache_cookie
*cookie, int retire)
}
/**
+ * fscache_check_consistency - Request that if the cache is updated
+ * @cookie: The cookie representing the cache object
+ *
+ * Request an consistency check from fscache, which resorts to backing
+ * cache.
+ */
+static inline
+bool fscache_check_consistency(struct fscache_cookie *cookie)
+{
+ if (fscache_cookie_valid(cookie))
+ return __fscache_check_consistency(cookie);
+ else
+ return false;
+}
+
+/**
* fscache_update_cookie - Request that a cache object be updated
* @cookie: The cookie representing the cache object
*
--
1.8.1.2
--
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