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xfs: remove xfs_qm_sync

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Now that we can't have any dirty dquots around that aren't in the AIL we
can get rid of the explicit dquot syncing from xfssyncd and xfs_fs_sync_fs
and instead rely on AIL pushing to write out any quota updates.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-12-06 21:58:12 +00:00 committed by Ben Myers
parent f2fba558d3
commit 34625c661b
5 changed files with 3 additions and 119 deletions
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94
fs/xfs/xfs_qm.c
View file

@ -879,100 +879,6 @@ xfs_qm_dqdetach(
}
}
int
xfs_qm_sync(
struct xfs_mount *mp,
int flags)
{
struct xfs_quotainfo *q = mp->m_quotainfo;
int recl, restarts;
struct xfs_dquot *dqp;
int error;
if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
return 0;
restarts = 0;
again:
mutex_lock(&q->qi_dqlist_lock);
/*
* dqpurge_all() also takes the mplist lock and iterate thru all dquots
* in quotaoff. However, if the QUOTA_ACTIVE bits are not cleared
* when we have the mplist lock, we know that dquots will be consistent
* as long as we have it locked.
*/
if (!XFS_IS_QUOTA_ON(mp)) {
mutex_unlock(&q->qi_dqlist_lock);
return 0;
}
ASSERT(mutex_is_locked(&q->qi_dqlist_lock));
list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
/*
* If this is vfs_sync calling, then skip the dquots that
* don't 'seem' to be dirty. ie. don't acquire dqlock.
* This is very similar to what xfs_sync does with inodes.
*/
if (flags & SYNC_TRYLOCK) {
if (!XFS_DQ_IS_DIRTY(dqp))
continue;
if (!xfs_qm_dqlock_nowait(dqp))
continue;
} else {
xfs_dqlock(dqp);
}
/*
* Now, find out for sure if this dquot is dirty or not.
*/
if (! XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqunlock(dqp);
continue;
}
/* XXX a sentinel would be better */
recl = q->qi_dqreclaims;
if (!xfs_dqflock_nowait(dqp)) {
if (flags & SYNC_TRYLOCK) {
xfs_dqunlock(dqp);
continue;
}
/*
* If we can't grab the flush lock then if the caller
* really wanted us to give this our best shot, so
* see if we can give a push to the buffer before we wait
* on the flush lock. At this point, we know that
* even though the dquot is being flushed,
* it has (new) dirty data.
*/
xfs_qm_dqflock_pushbuf_wait(dqp);
}
/*
* Let go of the mplist lock. We don't want to hold it
* across a disk write
*/
mutex_unlock(&q->qi_dqlist_lock);
error = xfs_qm_dqflush(dqp, flags);
xfs_dqunlock(dqp);
if (error && XFS_FORCED_SHUTDOWN(mp))
return 0; /* Need to prevent umount failure */
else if (error)
return error;
mutex_lock(&q->qi_dqlist_lock);
if (recl != q->qi_dqreclaims) {
if (++restarts >= XFS_QM_SYNC_MAX_RESTARTS)
break;
mutex_unlock(&q->qi_dqlist_lock);
goto again;
}
}
mutex_unlock(&q->qi_dqlist_lock);
return 0;
}
/*
* The hash chains and the mplist use the same xfs_dqhash structure as
* their list head, but we can take the mplist qh_lock and one of the

6
fs/xfs/xfs_qm.h
View file

@ -32,12 +32,6 @@ extern struct xfs_qm *xfs_Gqm;
extern kmem_zone_t *qm_dqzone;
extern kmem_zone_t *qm_dqtrxzone;
/*
* Used in xfs_qm_sync called by xfs_sync to count the max times that it can
* iterate over the mountpt's dquot list in one call.
*/
#define XFS_QM_SYNC_MAX_RESTARTS 7
/*
* Ditto, for xfs_qm_dqreclaim_one.
*/

5
fs/xfs/xfs_quota.h
View file

@ -326,7 +326,6 @@ extern int xfs_qm_dqattach_locked(struct xfs_inode *, uint);
extern void xfs_qm_dqdetach(struct xfs_inode *);
extern void xfs_qm_dqrele(struct xfs_dquot *);
extern void xfs_qm_statvfs(struct xfs_inode *, struct kstatfs *);
extern int xfs_qm_sync(struct xfs_mount *, int);
extern int xfs_qm_newmount(struct xfs_mount *, uint *, uint *);
extern void xfs_qm_mount_quotas(struct xfs_mount *);
extern void xfs_qm_unmount(struct xfs_mount *);
@ -366,10 +365,6 @@ static inline int xfs_trans_reserve_quota_bydquots(struct xfs_trans *tp,
#define xfs_qm_dqdetach(ip)
#define xfs_qm_dqrele(d)
#define xfs_qm_statvfs(ip, s)
static inline int xfs_qm_sync(struct xfs_mount *mp, int flags)
{
return 0;
}
#define xfs_qm_newmount(mp, a, b) (0)
#define xfs_qm_mount_quotas(mp)
#define xfs_qm_unmount(mp)

11
fs/xfs/xfs_super.c
View file

@ -1025,17 +1025,10 @@ xfs_fs_sync_fs(
int error;
/*
* Not much we can do for the first async pass. Writing out the
* superblock would be counter-productive as we are going to redirty
* when writing out other data and metadata (and writing out a single
* block is quite fast anyway).
*
* Try to asynchronously kick off quota syncing at least.
* Doing anything during the async pass would be counterproductive.
*/
if (!wait) {
xfs_qm_sync(mp, SYNC_TRYLOCK);
if (!wait)
return 0;
}
error = xfs_quiesce_data(mp);
if (error)

6
fs/xfs/xfs_sync.c
View file

@ -359,10 +359,7 @@ xfs_quiesce_data(
{
int error, error2 = 0;
xfs_qm_sync(mp, SYNC_TRYLOCK);
xfs_qm_sync(mp, SYNC_WAIT);
/* force out the newly dirtied log buffers */
/* force out the log */
xfs_log_force(mp, XFS_LOG_SYNC);
/* write superblock and hoover up shutdown errors */
@ -470,7 +467,6 @@ xfs_sync_worker(
error = xfs_fs_log_dummy(mp);
else
xfs_log_force(mp, 0);
error = xfs_qm_sync(mp, SYNC_TRYLOCK);
/* start pushing all the metadata that is currently dirty */
xfs_ail_push_all(mp->m_ail);