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cachefiles: Implement cache registration and withdrawal

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Do the following:

 (1) Fill out cachefiles_daemon_add_cache() so that it sets up the cache
     directories and registers the cache with cachefiles.

 (2) Add a function to do the top-level part of cache withdrawal and
     unregistration.

 (3) Add a function to sync a cache.

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/163819633175.215744.10857127598041268340.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906935445.143852.15545194974036410029.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967142904.1823006.244055483596047072.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021543872.640689.14370017789605073222.stgit@warthog.procyon.org.uk/ # v4
This commit is contained in:
David Howells
2021-11-26 14:29:06 +00:00
parent 32759f7d7a
commit d1065b0a6f
5 changed files with 240 additions and 3 deletions
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8
fs/cachefiles/daemon.c
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@@ -702,6 +702,7 @@ static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)
pr_warn("Cache is disabled for development\n");
return -ENOANO; // Don't allow the cache to operate yet
//return cachefiles_add_cache(cache);
}
/*
@@ -711,10 +712,11 @@ static void cachefiles_daemon_unbind(struct cachefiles_cache *cache)
{
_enter("");
if (test_bit(CACHEFILES_READY, &cache->flags)) {
// PLACEHOLDER: Withdraw cache
}
if (test_bit(CACHEFILES_READY, &cache->flags))
cachefiles_withdraw_cache(cache);
cachefiles_put_directory(cache->graveyard);
cachefiles_put_directory(cache->store);
mntput(cache->mnt);
kfree(cache->rootdirname);