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Btrfs: fix mount failure when qgroup rescan is in progress 

If a power failure happens while the qgroup rescan kthread is running,
the next mount operation will always fail. This is because of a recent
regression that makes qgroup_rescan_init() incorrectly return -EINVAL
when we are mounting the filesystem (through btrfs_read_qgroup_config()).
This causes the -EINVAL error to be returned regardless of any qgroup
flags being set instead of returning the error only when neither of
the flags BTRFS_QGROUP_STATUS_FLAG_RESCAN nor BTRFS_QGROUP_STATUS_FLAG_ON
are set.

A test case for fstests follows up soon.

Fixes: 9593bf4967 ("btrfs: qgroup: show more meaningful qgroup_rescan_init error message")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
hifive-unleashed-5.1
Filipe Manana 2018-06-27 00:43:15 +01:00 committed by David Sterba
parent 717beb96d9
commit e4e7ede739
1 changed files with 10 additions and 3 deletions
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13
fs/btrfs/qgroup.c
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@ -2786,13 +2786,20 @@ qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
if (!init_flags) {
/* we're resuming qgroup rescan at mount time */
if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN))
if (!(fs_info->qgroup_flags &
BTRFS_QGROUP_STATUS_FLAG_RESCAN)) {
btrfs_warn(fs_info,
"qgroup rescan init failed, qgroup is not enabled");
else if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))
ret = -EINVAL;
} else if (!(fs_info->qgroup_flags &
BTRFS_QGROUP_STATUS_FLAG_ON)) {
btrfs_warn(fs_info,
"qgroup rescan init failed, qgroup rescan is not queued");
return -EINVAL;
ret = -EINVAL;
}
if (ret)
return ret;
}
mutex_lock(&fs_info->qgroup_rescan_lock);