AuxXxilium/linux_dsm_epyc7002
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Revert "xfs: grab dquots without taking the ilock"

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This reverts commit 50e0bdbe9f.

The new XFS_QMOPT_NOLOCK isn't used at all, and conditional locking based
on a flag is always the wrong thing to do - we should be having helpers
that can be called without the lock instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2017-07-13 12:14:34 -07:00 committed by Darrick J. Wong
parent 29db2500f6
commit 0891f9971a
2 changed files with 4 additions and 12 deletions
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2
fs/xfs/libxfs/xfs_quota_defs.h
View File

@ -136,8 +136,6 @@ typedef uint16_t xfs_qwarncnt_t;
*/ */
#define XFS_QMOPT_INHERIT 0x1000000 #define XFS_QMOPT_INHERIT 0x1000000
#define XFS_QMOPT_NOLOCK 0x2000000 /* don't ilock during dqget */
/* /*
* flags to xfs_trans_mod_dquot. * flags to xfs_trans_mod_dquot.
*/ */

14
fs/xfs/xfs_dquot.c
View File

@ -472,23 +472,18 @@ xfs_qm_dqtobp(
struct xfs_mount *mp = dqp->q_mount; struct xfs_mount *mp = dqp->q_mount;
xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id); xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
struct xfs_trans *tp = (tpp ? *tpp : NULL); struct xfs_trans *tp = (tpp ? *tpp : NULL);
uint lock_mode = 0; uint lock_mode;
quotip = xfs_quota_inode(dqp->q_mount, dqp->dq_flags); quotip = xfs_quota_inode(dqp->q_mount, dqp->dq_flags);
dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk; dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
ASSERT(!(flags & XFS_QMOPT_NOLOCK) || lock_mode = xfs_ilock_data_map_shared(quotip);
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)) { if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
/* /*
* Return if this type of quotas is turned off while we * Return if this type of quotas is turned off while we
* didn't have the quota inode lock. * didn't have the quota inode lock.
*/ */
if (lock_mode) xfs_iunlock(quotip, lock_mode);
xfs_iunlock(quotip, lock_mode);
return -ESRCH; return -ESRCH;
} }
@ -498,8 +493,7 @@ xfs_qm_dqtobp(
error = xfs_bmapi_read(quotip, dqp->q_fileoffset, error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0); XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
if (lock_mode) xfs_iunlock(quotip, lock_mode);
xfs_iunlock(quotip, lock_mode);
if (error) if (error)
return error; return error;