On 2018年01月29日 15:44, Nikolay Borisov wrote:
> Running generic/019 with qgroups on the scratch device enabled is
> almost guaranteed to trigger the BUG_ON in btrfs_free_tree_block. It's
> supposed to trigger only on -ENOMEM, in reality, however, it's possible
> to get -EIO from btrfs_qgroup_trace_extent_post. This function just
> finds the roots of the extent being tracked and sets the qrecord->old_roots
> list. If this operation fails nothing critical happens except the
> quota accounting can be considered wrong. In such case just set the
> INCONSISTENT flag for the quota and print a warning.
>
> Signed-off-by: Nikolay Borisov <nborisov@xxxxxxxx>
> ---
>
> V2:
> * Always print a warning if btrfs_qgroup_trace_extent_post fails
> * Set quota inconsistent flag if btrfs_qgroup_trace_extent_post fails
>
> fs/btrfs/delayed-ref.c | 7 +++++--
> fs/btrfs/qgroup.c | 6 ++++--
> 2 files changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
> index a1a40cf382e3..5b2789a28a13 100644
> --- a/fs/btrfs/delayed-ref.c
> +++ b/fs/btrfs/delayed-ref.c
> @@ -820,8 +820,11 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
> num_bytes, parent, ref_root, level, action);
> spin_unlock(&delayed_refs->lock);
>
> - if (qrecord_inserted)
> - return btrfs_qgroup_trace_extent_post(fs_info, record);
> + if (qrecord_inserted) {
> + int ret = btrfs_qgroup_trace_extent_post(fs_info, record);
> + if (ret < 0)
> + btrfs_warn(fs_info, "Error accounting new delayed refs extent (err code: %d). Quota inconsistent", ret);
Sorry that I didn't point it out in previous review, there are 2 callers
in delayed-ref.c using btrfs_qgroup_trace_extent_post().
One is the one you're fixing, and the other one is
btrfs_add_delayed_data_ref().
So it would be even better if the warning message can be integrated into
btrfs_qgroup_trace_extent_post().
Also btrfs_qgroup_trace_extent_post() also needs to ignore the return
value from btrfs_qgroup_trace_extent_post().
Thanks,
Qu
> + }
> return 0;
>
> free_head_ref:
> diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
> index b2ab5f795816..33f9dba44e92 100644
> --- a/fs/btrfs/qgroup.c
> +++ b/fs/btrfs/qgroup.c
> @@ -1440,8 +1440,10 @@ int btrfs_qgroup_trace_extent_post(struct btrfs_fs_info *fs_info,
> int ret;
>
> ret = btrfs_find_all_roots(NULL, fs_info, bytenr, 0, &old_root, false);
> - if (ret < 0)
> + if (ret < 0) {
> + fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
> return ret;
> + }
>
> /*
> * Here we don't need to get the lock of
> @@ -2933,7 +2935,7 @@ static int __btrfs_qgroup_release_data(struct inode *inode,
> if (free && reserved)
> return qgroup_free_reserved_data(inode, reserved, start, len);
> extent_changeset_init(&changeset);
> - ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
> + ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
> start + len -1, EXTENT_QGROUP_RESERVED, &changeset);
> if (ret < 0)
> goto out;
>
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