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xfs: remove SYNC_BDFLUSH 

SYNC_BDFLUSH is a leftover from IRIX and rather misnamed for todays
code.  Make xfs_sync_fsdata and xfs_dq_sync use the SYNC_TRYLOCK flag
for not blocking on logs just as the inode sync code already does.

For xfs_sync_fsdata it's a trivial 1:1 replacement, but for xfs_qm_sync
I use the opportunity to decouple the non-blocking lock case from the
different flushing modes, similar to the inode sync code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>
This commit is contained in:
Christoph Hellwig 2009-06-08 15:37:16 +02:00 committed by Christoph Hellwig
parent b0710ccc6d
commit 8b5403a6d7
3 changed files with 11 additions and 30 deletions
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8
fs/xfs/linux-2.6/xfs_sync.c
View File

@ -353,7 +353,7 @@ xfs_sync_fsdata(
* If this is xfssyncd() then only sync the superblock if we can
* lock it without sleeping and it is not pinned.
*/
if (flags & SYNC_BDFLUSH) {
if (flags & SYNC_TRYLOCK) {
ASSERT(!(flags & SYNC_WAIT));
bp = xfs_getsb(mp, XFS_BUF_TRYLOCK);
@ -418,7 +418,7 @@ xfs_quiesce_data(
/* push non-blocking */
xfs_sync_data(mp, 0);
xfs_qm_sync(mp, SYNC_BDFLUSH);
xfs_qm_sync(mp, SYNC_TRYLOCK);
xfs_filestream_flush(mp);
/* push and block */
@ -568,8 +568,8 @@ xfs_sync_worker(
xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
xfs_reclaim_inodes(mp, XFS_IFLUSH_DELWRI_ELSE_ASYNC);
/* dgc: errors ignored here */
error = xfs_qm_sync(mp, SYNC_BDFLUSH);
error = xfs_sync_fsdata(mp, SYNC_BDFLUSH);
error = xfs_qm_sync(mp, SYNC_TRYLOCK);
error = xfs_sync_fsdata(mp, SYNC_TRYLOCK);
if (xfs_log_need_covered(mp))
error = xfs_commit_dummy_trans(mp, XFS_LOG_FORCE);
}

5
fs/xfs/linux-2.6/xfs_sync.h
View File

@ -29,9 +29,8 @@ typedef struct xfs_sync_work {
struct completion *w_completion;
} xfs_sync_work_t;
#define SYNC_WAIT 0x0004 /* wait for i/o to complete */
#define SYNC_BDFLUSH 0x0008 /* BDFLUSH is calling -- don't block */
#define SYNC_TRYLOCK 0x0020 /* only try to lock inodes */
#define SYNC_WAIT 0x0001 /* wait for i/o to complete */
#define SYNC_TRYLOCK 0x0002 /* only try to lock inodes */
int xfs_syncd_init(struct xfs_mount *mp);
void xfs_syncd_stop(struct xfs_mount *mp);

28
fs/xfs/quota/xfs_qm.c
View File

@ -905,11 +905,6 @@ xfs_qm_dqdetach(
}
}
/*
* This is called to sync quotas. We can be told to use non-blocking
* semantics by either the SYNC_BDFLUSH flag or the absence of the
* SYNC_WAIT flag.
*/
int
xfs_qm_sync(
xfs_mount_t *mp,
@ -918,17 +913,13 @@ xfs_qm_sync(
int recl, restarts;
xfs_dquot_t *dqp;
uint flush_flags;
boolean_t nowait;
int error;
if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
return 0;
flush_flags = (flags & SYNC_WAIT) ? XFS_QMOPT_SYNC : XFS_QMOPT_DELWRI;
restarts = 0;
/*
* We won't block unless we are asked to.
*/
nowait = (boolean_t)(flags & SYNC_BDFLUSH || (flags & SYNC_WAIT) == 0);
again:
xfs_qm_mplist_lock(mp);
@ -948,18 +939,10 @@ xfs_qm_sync(
* 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_BDFLUSH) {
if (! XFS_DQ_IS_DIRTY(dqp))
if (flags & SYNC_TRYLOCK) {
if (!XFS_DQ_IS_DIRTY(dqp))
continue;
}
if (nowait) {
/*
* Try to acquire the dquot lock. We are NOT out of
* lock order, but we just don't want to wait for this
* lock, unless somebody wanted us to.
*/
if (! xfs_qm_dqlock_nowait(dqp))
if (!xfs_qm_dqlock_nowait(dqp))
continue;
} else {
xfs_dqlock(dqp);
@ -976,7 +959,7 @@ xfs_qm_sync(
/* XXX a sentinel would be better */
recl = XFS_QI_MPLRECLAIMS(mp);
if (!xfs_dqflock_nowait(dqp)) {
if (nowait) {
if (flags & SYNC_TRYLOCK) {
xfs_dqunlock(dqp);
continue;
}
@ -994,7 +977,6 @@ xfs_qm_sync(
* Let go of the mplist lock. We don't want to hold it
* across a disk write
*/
flush_flags = (nowait) ? XFS_QMOPT_DELWRI : XFS_QMOPT_SYNC;
xfs_qm_mplist_unlock(mp);
xfs_dqtrace_entry(dqp, "XQM_SYNC: DQFLUSH");
error = xfs_qm_dqflush(dqp, flush_flags);