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cachefiles: Implement culling daemon commands

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Implement the ability for the userspace daemon to try and cull a file or
directory in the cache.  Two daemon commands are implemented:

 (1) The "inuse" command.  This queries if a file is in use or whether it
     can be deleted.  It checks the S_KERNEL_FILE flag on the inode
     referred to by the specified filename.

 (2) The "cull" command.  This asks for a file or directory to be removed,
     where removal means either unlinking it or moving it to the graveyard
     directory for userspace to dismantle.

Changes
=======
ver #2:
 - Fix logging of wrong error[1].
 - Need to unmark an inode we've moved to the graveyard before unlocking.

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/20211203094950.GA2480@kili/ [1]
Link: https://lore.kernel.org/r/163819643179.215744.13641580295708315695.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906945705.143852.8177595531814485350.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967155792.1823006.1088936326902550910.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021555037.640689.9472627499842585255.stgit@warthog.procyon.org.uk/ # v4
This commit is contained in:
David Howells
2021-10-21 08:50:10 +01:00
parent 169379eaef
commit 07a90e9740
3 changed files with 320 additions and 2 deletions
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4
fs/cachefiles/daemon.c
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@ -574,7 +574,7 @@ static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
goto notdir;
cachefiles_begin_secure(cache, &saved_cred);
ret = -ENOANO; // PLACEHOLDER: Do culling
ret = cachefiles_cull(cache, path.dentry, args);
cachefiles_end_secure(cache, saved_cred);
path_put(&path);
@ -645,7 +645,7 @@ static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
goto notdir;
cachefiles_begin_secure(cache, &saved_cred);
ret = -ENOANO; // PLACEHOLDER: Check if in use
ret = cachefiles_check_in_use(cache, path.dentry, args);
cachefiles_end_secure(cache, saved_cred);
path_put(&path);