Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.15 25/41] btrfs: do not BUG_ON() on failure to migrate space when replacing extents | Date | Mon, 27 Jun 2022 22:20:44 -0400 |
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From: Filipe Manana <fdmanana@suse.com>
[ Upstream commit 650c9caba32a0167a018cca0fab32a2965d23513 ]
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 <boris@bur.io> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/btrfs/file.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 07ec05a810b4..a4849a7001e6 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -2745,7 +2745,8 @@ 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; @@ -2864,7 +2865,8 @@ 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; -- 2.35.1
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