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xfs: move more delwri setup into xfs_buf_delwri_queue

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Do not transfer a reference held by the caller to the buffer on the list,
or decrement it in xfs_buf_delwri_queue, but instead grab a new reference
if needed, and let the caller drop its own reference.  Also move setting
of the XBF_DELWRI and XBF_ASYNC flags into xfs_buf_delwri_queue, and
only do it if needed.  Note that for now xfs_buf_unlock already has
XBF_DELWRI, but that will change in the following patches.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-08-23 08:28:05 +00:00 committed by Alex Elder
parent 527cfdf19d
commit 5a8ee6bafd
1 changed files with 12 additions and 19 deletions
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31
fs/xfs/xfs_buf.c
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@ -937,11 +937,8 @@ void
xfs_buf_unlock(
struct xfs_buf *bp)
{
if ((bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)) == XBF_DELWRI) {
atomic_inc(&bp->b_hold);
bp->b_flags |= XBF_ASYNC;
if ((bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)) == XBF_DELWRI)
xfs_buf_delwri_queue(bp);
}
XB_CLEAR_OWNER(bp);
up(&bp->b_sema);
@ -1046,11 +1043,8 @@ xfs_bdwrite(
{
trace_xfs_buf_bdwrite(bp, _RET_IP_);
bp->b_flags &= ~XBF_READ;
bp->b_flags |= (XBF_DELWRI | XBF_ASYNC);
xfs_buf_delwri_queue(bp);
xfs_buf_unlock(bp);
xfs_buf_relse(bp);
}
/*
@ -1570,23 +1564,22 @@ xfs_buf_delwri_queue(
trace_xfs_buf_delwri_queue(bp, _RET_IP_);
ASSERT((bp->b_flags&(XBF_DELWRI|XBF_ASYNC)) == (XBF_DELWRI|XBF_ASYNC));
ASSERT(!(bp->b_flags & XBF_READ));
spin_lock(dwlk);
/* If already in the queue, dequeue and place at tail */
if (!list_empty(&bp->b_list)) {
/* if already in the queue, move it to the tail */
ASSERT(bp->b_flags & _XBF_DELWRI_Q);
atomic_dec(&bp->b_hold);
list_del(&bp->b_list);
}
if (list_empty(dwq)) {
list_move_tail(&bp->b_list, dwq);
} else {
/* start xfsbufd as it is about to have something to do */
wake_up_process(bp->b_target->bt_task);
}
if (list_empty(dwq))
wake_up_process(bp->b_target->bt_task);
bp->b_flags |= _XBF_DELWRI_Q;
list_add_tail(&bp->b_list, dwq);
atomic_inc(&bp->b_hold);
bp->b_flags |= XBF_DELWRI | _XBF_DELWRI_Q | XBF_ASYNC;
list_add_tail(&bp->b_list, dwq);
}
bp->b_queuetime = jiffies;
spin_unlock(dwlk);
}