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cachefiles: Implement volume support

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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 <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
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
This commit is contained in:
David Howells
2021-10-21 09:55:21 +01:00
parent d1065b0a6f
commit fe2140e2f5
6 changed files with 171 additions and 2 deletions
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fs/cachefiles/cache.c
+27 -1
View File
@@ -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);