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Btrfs: fix inode cache waiters hanging on path allocation failure

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If the caching thread fails to allocate a path, it returns without waking
up any cache waiters, leaving them hang forever. Fix this by following the
same approach as when we fail to start the caching thread: print an error
message, disable inode caching and make the wakers fallback to non-caching
mode behaviour (calling btrfs_find_free_objectid()).

Fixes: 581bb05094 ("Btrfs: Cache free inode numbers in memory")
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2019-07-04 16:24:44 +01:00 committed by David Sterba
parent a68ebe0790
commit 9d123a35d7
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/inode-map.c
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@ -42,8 +42,10 @@ static int caching_kthread(void *data)
return 0;
path = btrfs_alloc_path();
if (!path)
if (!path) {
fail_caching_thread(root);
return -ENOMEM;
}
/* Since the commit root is read-only, we can safely skip locking. */
path->skip_locking = 1;