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btrfs: fix leaked plug after failure syncing log on zoned filesystems

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On a zoned filesystem, if we fail to allocate the root node for the log
root tree while syncing the log, we end up returning without finishing
the IO plug we started before, resulting in leaking resources as we
have started writeback for extent buffers of a log tree before. That
allocation failure, which typically is either -ENOMEM or -ENOSPC, is not
fatal and the fsync can safely fallback to a full transaction commit.

So release the IO plug if we fail to allocate the extent buffer for the
root of the log root tree when syncing the log on a zoned filesystem.

Fixes: 3ddebf27fc ("btrfs: zoned: reorder log node allocation on zoned filesystem")
CC: stable@vger.kernel.org # 5.15+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2022-04-06 17:07:54 +01:00 committed by David Sterba
parent acee08aaf6
commit 50ff57888d
1 changed files with 1 additions and 0 deletions
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fs/btrfs/tree-log.c
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@ -3188,6 +3188,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
ret = btrfs_alloc_log_tree_node(trans, log_root_tree);
if (ret) {
mutex_unlock(&fs_info->tree_root->log_mutex);
blk_finish_plug(&plug);
goto out;
}
}