From fe2140e2f57fef8562e0f9b7cd447d2b08dc2f35 Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 21 Oct 2021 09:55:21 +0100 Subject: cachefiles: Implement volume support Implement support for creating the directory layout for a volume on disk and setting up and withdrawing volume caching. Each volume has a directory named for the volume key under the root of the cache (prefixed with an 'I' to indicate to cachefilesd that it's an index) and then creates a bunch of hash bucket subdirectories under that (named as '@' plus a hex number) in which cookie files will be created. Signed-off-by: David Howells Reviewed-by: Jeff Layton cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/163819635314.215744.13081522301564537723.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/163906936397.143852.17788457778396467161.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/163967143860.1823006.7185205806080225038.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/164021545212.640689.5064821392307582927.stgit@warthog.procyon.org.uk/ # v4 --- fs/cachefiles/cache.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) (limited to 'fs/cachefiles/cache.c') diff --git a/fs/cachefiles/cache.c b/fs/cachefiles/cache.c index 0462e7af87fb..c4b9280ca0cd 100644 --- a/fs/cachefiles/cache.c +++ b/fs/cachefiles/cache.c @@ -262,6 +262,32 @@ begin_cull: return ret; } +/* + * Withdraw volumes. + */ +static void cachefiles_withdraw_volumes(struct cachefiles_cache *cache) +{ + _enter(""); + + for (;;) { + struct cachefiles_volume *volume = NULL; + + spin_lock(&cache->object_list_lock); + if (!list_empty(&cache->volumes)) { + volume = list_first_entry(&cache->volumes, + struct cachefiles_volume, cache_link); + list_del_init(&volume->cache_link); + } + spin_unlock(&cache->object_list_lock); + if (!volume) + break; + + cachefiles_withdraw_volume(volume); + } + + _leave(""); +} + /* * Sync a cache to backing disk. */ @@ -303,7 +329,7 @@ void cachefiles_withdraw_cache(struct cachefiles_cache *cache) // PLACEHOLDER: Withdraw objects fscache_wait_for_objects(fscache); - // PLACEHOLDER: Withdraw volume + cachefiles_withdraw_volumes(cache); cachefiles_sync_cache(cache); cache->cache = NULL; fscache_relinquish_cache(fscache); -- cgit v1.2.3