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xfs: use proper interfaces for on-stack plugging

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Add proper blk_start_plug/blk_finish_plug pairs for the two places where
we issue buffer I/O, and remove the blk_flush_plug in xfs_buf_lock and
xfs_buf_iowait, given that context switches already flush the per-process
plugging lists.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-03-30 11:05:09 +00:00 committed by Alex Elder
parent 957935dcd8
commit a1b7ea5d58
1 changed files with 9 additions and 11 deletions
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20
fs/xfs/linux-2.6/xfs_buf.c
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@ -915,8 +915,6 @@ xfs_buf_lock(
if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE))
xfs_log_force(bp->b_target->bt_mount, 0);
if (atomic_read(&bp->b_io_remaining))
blk_flush_plug(current);
down(&bp->b_sema);
XB_SET_OWNER(bp);
@ -1305,8 +1303,6 @@ xfs_buf_iowait(
{
trace_xfs_buf_iowait(bp, _RET_IP_);
if (atomic_read(&bp->b_io_remaining))
blk_flush_plug(current);
wait_for_completion(&bp->b_iowait);
trace_xfs_buf_iowait_done(bp, _RET_IP_);
@ -1743,8 +1739,8 @@ xfsbufd(
do {
long age = xfs_buf_age_centisecs * msecs_to_jiffies(10);
long tout = xfs_buf_timer_centisecs * msecs_to_jiffies(10);
int count = 0;
struct list_head tmp;
struct blk_plug plug;
if (unlikely(freezing(current))) {
set_bit(XBT_FORCE_SLEEP, &target->bt_flags);
@ -1760,16 +1756,15 @@ xfsbufd(
xfs_buf_delwri_split(target, &tmp, age);
list_sort(NULL, &tmp, xfs_buf_cmp);
blk_start_plug(&plug);
while (!list_empty(&tmp)) {
struct xfs_buf *bp;
bp = list_first_entry(&tmp, struct xfs_buf, b_list);
list_del_init(&bp->b_list);
xfs_bdstrat_cb(bp);
count++;
}
if (count)
blk_flush_plug(current);
blk_finish_plug(&plug);
} while (!kthread_should_stop());
return 0;
@ -1789,6 +1784,7 @@ xfs_flush_buftarg(
int pincount = 0;
LIST_HEAD(tmp_list);
LIST_HEAD(wait_list);
struct blk_plug plug;
xfs_buf_runall_queues(xfsconvertd_workqueue);
xfs_buf_runall_queues(xfsdatad_workqueue);
@ -1803,6 +1799,8 @@ xfs_flush_buftarg(
* we do that after issuing all the IO.
*/
list_sort(NULL, &tmp_list, xfs_buf_cmp);
blk_start_plug(&plug);
while (!list_empty(&tmp_list)) {
bp = list_first_entry(&tmp_list, struct xfs_buf, b_list);
ASSERT(target == bp->b_target);
@ -1813,10 +1811,10 @@ xfs_flush_buftarg(
}
xfs_bdstrat_cb(bp);
}
blk_finish_plug(&plug);
if (wait) {
/* Expedite and wait for IO to complete. */
blk_flush_plug(current);
/* Wait for IO to complete. */
while (!list_empty(&wait_list)) {
bp = list_first_entry(&wait_list, struct xfs_buf, b_list);