6.15-stable review patch. If anyone has any objections, please let me know.
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From: Filipe Manana fdmanana@suse.com
commit fc5799986fbca957e2e3c0480027f249951b7bcf upstream.
Currently we only log an error message if we can't find the block group for a log tree extent buffer when unaccounting it (while freeing a log tree). A missing block group means something is seriously wrong and we end up leaking space from the metadata space info. So return -ENOENT in case we don't find the block group.
CC: stable@vger.kernel.org # 6.12+ Reviewed-by: Boris Burkov boris@bur.io Reviewed-by: Qu Wenruo wqu@suse.com Signed-off-by: Filipe Manana fdmanana@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 --- fs/btrfs/tree-log.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-)
--- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -2571,14 +2571,14 @@ static int replay_one_buffer(struct btrf /* * Correctly adjust the reserved bytes occupied by a log tree extent buffer */ -static void unaccount_log_buffer(struct btrfs_fs_info *fs_info, u64 start) +static int unaccount_log_buffer(struct btrfs_fs_info *fs_info, u64 start) { struct btrfs_block_group *cache;
cache = btrfs_lookup_block_group(fs_info, start); if (!cache) { btrfs_err(fs_info, "unable to find block group for %llu", start); - return; + return -ENOENT; }
spin_lock(&cache->space_info->lock); @@ -2589,27 +2589,22 @@ static void unaccount_log_buffer(struct spin_unlock(&cache->space_info->lock);
btrfs_put_block_group(cache); + + return 0; }
static int clean_log_buffer(struct btrfs_trans_handle *trans, struct extent_buffer *eb) { - int ret; - btrfs_tree_lock(eb); btrfs_clear_buffer_dirty(trans, eb); wait_on_extent_buffer_writeback(eb); btrfs_tree_unlock(eb);
- if (trans) { - ret = btrfs_pin_reserved_extent(trans, eb); - if (ret) - return ret; - } else { - unaccount_log_buffer(eb->fs_info, eb->start); - } + if (trans) + return btrfs_pin_reserved_extent(trans, eb);
- return 0; + return unaccount_log_buffer(eb->fs_info, eb->start); }
static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans,