fs/netfs/fscache_volume.c

2 /* Volume-level cache cookie handling.
39  * Pin the cache behind a volume so that we can access it.
55  * fscache_begin_volume_access - Pin a cache so a volume can be accessed
60  * Attempt to pin the cache to prevent it from going away whilst we're
63  *  (1) If the cache tests as not live (state is not FSCACHE_CACHE_IS_ACTIVE),
66  *  (2) If the cache tests as live, then we increment the volume's n_accesses
67  *      count and then recheck the cache liveness, ending the access if it
73  *  (4) Whilst the cache is caching, the volume's n_accesses is kept
76  *  (5) When the cache is taken offline, the state is changed to prevent new
87 	if (!fscache_cache_is_live(volume->cache))
90 	if (!fscache_cache_is_live(volume->cache)) {
98  * fscache_end_volume_access - Unpin a cache at the end of an access.
103  * Unpin a cache volume after we've accessed it.  The datafile @cookie and the
128 	    a->cache	!= b->cache ||
205 	struct fscache_cache *cache;
216 	cache = fscache_lookup_cache(cache_name, false);
217 	if (IS_ERR(cache))
225 	volume->cache = cache;
249 	atomic_inc(&cache->n_volumes);
260 	fscache_put_cache(cache, fscache_cache_put_alloc_volume);
266  * Create a volume's representation on disk.  Have a volume ref and a cache
277 	ops = volume->cache->ops;
280 	fscache_end_cache_access(volume->cache,
296 	if (!fscache_begin_cache_access(volume->cache,
317  * Acquire a volume representation cookie and link it to a (proposed) cache.
376  * Drop a cache's volume attachments.
380 	struct fscache_cache *cache = volume->cache;
386 			cache->ops->free_volume(volume);
393 	atomic_dec(&volume->cache->n_volumes);
403 	fscache_put_cache(cache, fscache_cache_put_volume);
448  * Withdraw a cache volume from service, waiting for all accesses to complete
491 		   volume->cache->name ?: "-",