btrfs: unlock extents in btrfs_zero_range in case of quota reservation errors

commit 4f6a49de64fd1b1dba5229c02047376da7cf24fd upstream.

If btrfs_qgroup_reserve_data returns an error (i.e quota limit reached)
the handling logic directly goes to the 'out' label without first
unlocking the extent range between lockstart, lockend. This results in
deadlocks as other processes try to lock the same extent.

Fixes: a7f8b1c2ac21 ("btrfs: file: reserve qgroup space after the hole punch range is locked")
CC: stable@vger.kernel.org # 5.10+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 4373da7bcc0d58a3d63fe33afdbd6547a17bf7a1..c81a20cc10dc82972ec30927ea8be174e7ce6e13 100644 (file)
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -3236,8 +3236,11 @@ static int btrfs_zero_range(struct inode *inode,
                        goto out;
                ret = btrfs_qgroup_reserve_data(BTRFS_I(inode), &data_reserved,
                                                alloc_start, bytes_to_reserve);
-               if (ret)
+               if (ret) {
+                       unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart,
+                                            lockend, &cached_state);
                        goto out;
+               }
                ret = btrfs_prealloc_file_range(inode, mode, alloc_start,
                                                alloc_end - alloc_start,
                                                i_blocksize(inode),