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xfs: grab dquots without taking the ilock

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Add a new dqget flag that grabs the dquot without taking the ilock.
This will be used by the scrubber (which will have already grabbed
the ilock) to perform basic sanity checking of the quota data.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong
2017-06-27 10:19:45 -07:00
rodzic 244e3dea58
commit 50e0bdbe9f
2 zmienionych plików z 12 dodań i 4 usunięć
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14
fs/xfs/xfs_dquot.c
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@@ -472,18 +472,23 @@ xfs_qm_dqtobp(
struct xfs_mount *mp = dqp->q_mount;
xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
struct xfs_trans *tp = (tpp ? *tpp : NULL);
uint lock_mode;
uint lock_mode = 0;
quotip = xfs_quota_inode(dqp->q_mount, dqp->dq_flags);
dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
lock_mode = xfs_ilock_data_map_shared(quotip);
ASSERT(!(flags & XFS_QMOPT_NOLOCK) ||
xfs_isilocked(quotip, XFS_ILOCK_SHARED) ||
xfs_isilocked(quotip, XFS_ILOCK_EXCL));
if (!(flags & XFS_QMOPT_NOLOCK))
lock_mode = xfs_ilock_data_map_shared(quotip);
if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
/*
* Return if this type of quotas is turned off while we
* didn't have the quota inode lock.
*/
xfs_iunlock(quotip, lock_mode);
if (lock_mode)
xfs_iunlock(quotip, lock_mode);
return -ESRCH;
}
@@ -493,7 +498,8 @@ xfs_qm_dqtobp(
error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
xfs_iunlock(quotip, lock_mode);
if (lock_mode)
xfs_iunlock(quotip, lock_mode);
if (error)
return error;