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xfs: remove xfs_trans_unlocked_item 

There is no reason to wake up log space waiters when unlocking inodes or
dquots, and the commit log has no explanation for this function either.

Given that we now have exact log space wakeups everywhere we can assume
the reason for this function was to paper over log space races in earlier
XFS versions.

Reviewed-by: Mark Tinguely <tinguely@sgi.com>
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 2012-02-20 02:31:22 +00:00 committed by Ben Myers
parent 3af1de753b
commit 5b03ff1b24
8 changed files with 5 additions and 104 deletions
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11
fs/xfs/xfs_dquot.c
View File

@ -1076,17 +1076,6 @@ xfs_qm_dqflush(
}
void
xfs_dqunlock(
xfs_dquot_t *dqp)
{
xfs_dqunlock_nonotify(dqp);
if (dqp->q_logitem.qli_dquot == dqp) {
xfs_trans_unlocked_item(dqp->q_logitem.qli_item.li_ailp,
&dqp->q_logitem.qli_item);
}
}
/*
* Lock two xfs_dquot structures.
*

3
fs/xfs/xfs_dquot.h
View File

@ -110,7 +110,7 @@ static inline void xfs_dqlock(struct xfs_dquot *dqp)
mutex_lock(&dqp->q_qlock);
}
static inline void xfs_dqunlock_nonotify(struct xfs_dquot *dqp)
static inline void xfs_dqunlock(struct xfs_dquot *dqp)
{
mutex_unlock(&dqp->q_qlock);
}
@ -166,7 +166,6 @@ extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,
extern void xfs_qm_dqput(xfs_dquot_t *);
extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
extern void xfs_dqunlock(struct xfs_dquot *);
extern void xfs_dqflock_pushbuf_wait(struct xfs_dquot *dqp);
static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)

13
fs/xfs/xfs_iget.c
View File

@ -642,8 +642,7 @@ xfs_iunlock(
(XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
(XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY |
XFS_LOCK_DEP_MASK)) == 0);
ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
ASSERT(lock_flags != 0);
if (lock_flags & XFS_IOLOCK_EXCL)
@ -656,16 +655,6 @@ xfs_iunlock(
else if (lock_flags & XFS_ILOCK_SHARED)
mrunlock_shared(&ip->i_lock);
if ((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) &&
!(lock_flags & XFS_IUNLOCK_NONOTIFY) && ip->i_itemp) {
/*
* Let the AIL know that this item has been unlocked in case
* it is in the AIL and anyone is waiting on it. Don't do
* this if the caller has asked us not to.
*/
xfs_trans_unlocked_item(ip->i_itemp->ili_item.li_ailp,
(xfs_log_item_t*)(ip->i_itemp));
}
trace_xfs_iunlock(ip, lock_flags, _RET_IP_);
}

4
fs/xfs/xfs_inode.h
View File

@ -422,7 +422,6 @@ static inline int xfs_isiflocked(struct xfs_inode *ip)
#define XFS_IOLOCK_SHARED (1<<1)
#define XFS_ILOCK_EXCL (1<<2)
#define XFS_ILOCK_SHARED (1<<3)
#define XFS_IUNLOCK_NONOTIFY (1<<4)
#define XFS_LOCK_MASK (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)
@ -431,8 +430,7 @@ static inline int xfs_isiflocked(struct xfs_inode *ip)
{ XFS_IOLOCK_EXCL, "IOLOCK_EXCL" }, \
{ XFS_IOLOCK_SHARED, "IOLOCK_SHARED" }, \
{ XFS_ILOCK_EXCL, "ILOCK_EXCL" }, \
{ XFS_ILOCK_SHARED, "ILOCK_SHARED" }, \
{ XFS_IUNLOCK_NONOTIFY, "IUNLOCK_NONOTIFY" }
{ XFS_ILOCK_SHARED, "ILOCK_SHARED" }
/*

6
fs/xfs/xfs_inode_item.c
View File

@ -596,11 +596,7 @@ xfs_inode_item_trylock(
/* Stale items should force out the iclog */
if (ip->i_flags & XFS_ISTALE) {
xfs_ifunlock(ip);
/*
* we hold the AIL lock - notify the unlock routine of this
* so it doesn't try to get the lock again.
*/
xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
return XFS_ITEM_PINNED;
}

44
fs/xfs/xfs_trans_ail.c
View File

@ -610,50 +610,6 @@ xfs_ail_push_all(
xfs_ail_push(ailp, threshold_lsn);
}
/*
* This is to be called when an item is unlocked that may have
* been in the AIL. It will wake up the first member of the AIL
* wait list if this item's unlocking might allow it to progress.
* If the item is in the AIL, then we need to get the AIL lock
* while doing our checking so we don't race with someone going
* to sleep waiting for this event in xfs_trans_push_ail().
*/
void
xfs_trans_unlocked_item(
struct xfs_ail *ailp,
xfs_log_item_t *lip)
{
xfs_log_item_t *min_lip;
/*
* If we're forcibly shutting down, we may have
* unlocked log items arbitrarily. The last thing
* we want to do is to move the tail of the log
* over some potentially valid data.
*/
if (!(lip->li_flags & XFS_LI_IN_AIL) ||
XFS_FORCED_SHUTDOWN(ailp->xa_mount)) {
return;
}
/*
* This is the one case where we can call into xfs_ail_min()
* without holding the AIL lock because we only care about the
* case where we are at the tail of the AIL. If the object isn't
* at the tail, it doesn't matter what result we get back. This
* is slightly racy because since we were just unlocked, we could
* go to sleep between the call to xfs_ail_min and the call to
* xfs_log_space_wake, have someone else lock us, commit to us disk,
* move us out of the tail of the AIL, and then we wake up. However,
* the call to xfs_log_space_wake() doesn't do anything if there's
* not enough free space to wake people up so we're safe calling it.
*/
min_lip = xfs_ail_min(ailp);
if (min_lip == lip)
xfs_log_space_wake(ailp->xa_mount, true);
} /* xfs_trans_unlocked_item */
/*
* xfs_trans_ail_update - bulk AIL insertion operation.
*

25
fs/xfs/xfs_trans_buf.c
View File

@ -463,19 +463,7 @@ xfs_trans_brelse(xfs_trans_t *tp,
* Default to a normal brelse() call if the tp is NULL.
*/
if (tp == NULL) {
struct xfs_log_item *lip = bp->b_fspriv;
ASSERT(bp->b_transp == NULL);
/*
* If there's a buf log item attached to the buffer,
* then let the AIL know that the buffer is being
* unlocked.
*/
if (lip != NULL && lip->li_type == XFS_LI_BUF) {
bip = bp->b_fspriv;
xfs_trans_unlocked_item(bip->bli_item.li_ailp, lip);
}
xfs_buf_relse(bp);
return;
}
@ -550,21 +538,10 @@ xfs_trans_brelse(xfs_trans_t *tp,
ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL));
ASSERT(!(bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF));
xfs_buf_item_relse(bp);
bip = NULL;
}
bp->b_transp = NULL;
/*
* If we've still got a buf log item on the buffer, then
* tell the AIL that the buffer is being unlocked.
*/
if (bip != NULL) {
xfs_trans_unlocked_item(bip->bli_item.li_ailp,
(xfs_log_item_t*)bip);
}
xfs_buf_relse(bp);
return;
}
/*

3
fs/xfs/xfs_trans_priv.h
View File

@ -104,9 +104,6 @@ void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
void xfs_ail_push_all(struct xfs_ail *);
xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
void xfs_trans_unlocked_item(struct xfs_ail *,
xfs_log_item_t *);
struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
struct xfs_ail_cursor *cur,
xfs_lsn_t lsn);