From: Filipe Manana Date: Mon, 6 Jun 2022 09:41:19 +0000 (+0100) Subject: btrfs: do not BUG_ON() on failure to migrate space when replacing extents X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=650c9caba32a0167a018cca0fab32a2965d23513;p=linux.git btrfs: do not BUG_ON() on failure to migrate space when replacing extents At btrfs_replace_file_extents(), if we fail to migrate reserved metadata space from the transaction block reserve into the local block reserve, we trigger a BUG_ON(). This is because it should not be possible to have a failure here, as we reserved more space when we started the transaction than the space we want to migrate. However having a BUG_ON() is way too drastic, we can perfectly handle the failure and return the error to the caller. So just do that instead, and add a WARN_ON() to make it easier to notice the failure if it ever happens (which is particularly useful for fstests, and the warning will trigger a failure of a test case). Reviewed-by: Boris Burkov Signed-off-by: Filipe Manana Signed-off-by: David Sterba --- diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 8e7fb3e6f79c2..dd30639ecac23 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -2718,7 +2718,8 @@ int btrfs_replace_file_extents(struct btrfs_inode *inode, ret = btrfs_block_rsv_migrate(&fs_info->trans_block_rsv, rsv, min_size, false); - BUG_ON(ret); + if (WARN_ON(ret)) + goto out_trans; trans->block_rsv = rsv; cur_offset = start; @@ -2837,7 +2838,8 @@ int btrfs_replace_file_extents(struct btrfs_inode *inode, ret = btrfs_block_rsv_migrate(&fs_info->trans_block_rsv, rsv, min_size, false); - BUG_ON(ret); /* shouldn't happen */ + if (WARN_ON(ret)) + break; trans->block_rsv = rsv; cur_offset = drop_args.drop_end;