On 11/21/2017 11:58 AM, jeffm@xxxxxxxx wrote:
> From: Jeff Mahoney <jeffm@xxxxxxxx>
>
> Since commit fb235dc06fa (btrfs: qgroup: Move half of the qgroup
> accounting time out of commit trans) the assumption that
> btrfs_add_delayed_{data,tree}_ref can only return 0 or -ENOMEM has
> been false. The qgroup operations call into btrfs_search_slot
> and friends and can now return the full spectrum of error codes.
>
> Fortunately, the fix here is easy since update_ref_for_cow failing
> is already handled so we just need to bail early with the error
> code.
>
> Fixes: fb235dc06fa (btrfs: qgroup: Move half of the qgroup accounting ...)
> Cc: <stable@xxxxxxxxxxxxxxx> # v4.11+
> Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
Reviewed-by: Edmund Nadolski <enadolski@xxxxxxxx>
> ---
> fs/btrfs/ctree.c | 18 ++++++++++++------
> 1 file changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
> index 531e0a8645b0..1e74cf826532 100644
> --- a/fs/btrfs/ctree.c
> +++ b/fs/btrfs/ctree.c
> @@ -1032,14 +1032,17 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
> root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) &&
> !(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) {
> ret = btrfs_inc_ref(trans, root, buf, 1);
> - BUG_ON(ret); /* -ENOMEM */
> + if (ret)
> + return ret;
>
> if (root->root_key.objectid ==
> BTRFS_TREE_RELOC_OBJECTID) {
> ret = btrfs_dec_ref(trans, root, buf, 0);
> - BUG_ON(ret); /* -ENOMEM */
> + if (ret)
> + return ret;
> ret = btrfs_inc_ref(trans, root, cow, 1);
> - BUG_ON(ret); /* -ENOMEM */
> + if (ret)
> + return ret;
> }
> new_flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
> } else {
> @@ -1049,7 +1052,8 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
> ret = btrfs_inc_ref(trans, root, cow, 1);
> else
> ret = btrfs_inc_ref(trans, root, cow, 0);
> - BUG_ON(ret); /* -ENOMEM */
> + if (ret)
> + return ret;
> }
> if (new_flags != 0) {
> int level = btrfs_header_level(buf);
> @@ -1068,9 +1072,11 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
> ret = btrfs_inc_ref(trans, root, cow, 1);
> else
> ret = btrfs_inc_ref(trans, root, cow, 0);
> - BUG_ON(ret); /* -ENOMEM */
> + if (ret)
> + return ret;
> ret = btrfs_dec_ref(trans, root, buf, 1);
> - BUG_ON(ret); /* -ENOMEM */
> + if (ret)
> + return ret;
> }
> clean_tree_block(fs_info, buf);
> *last_ref = 1;
>
--
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