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gfs2: Don't get stuck with I/O plugged in gfs2_ail1_flush 

In gfs2_ail1_flush, we're using I/O plugging to give the block layer a
better chance of merging I/O requests.  If we're too aggressive here, we
can end up waiting on I/O to complete while still plugged.  Fix that in
a way similar to writeback_sb_inodes, except that we can't use
blk_flush_plug because blk_flush_plug_list is not exported.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Bob Peterson 2021-02-18 09:07:21 -05:00 committed by Andreas Gruenbacher
parent 803074ad77
commit 17d7768408
1 changed files with 7 additions and 2 deletions
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9
fs/gfs2/log.c
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@ -91,7 +91,7 @@ void gfs2_remove_from_ail(struct gfs2_bufdata *bd)
static int gfs2_ail1_start_one(struct gfs2_sbd *sdp,
struct writeback_control *wbc,
struct gfs2_trans *tr)
struct gfs2_trans *tr, struct blk_plug *plug)
__releases(&sdp->sd_ail_lock)
__acquires(&sdp->sd_ail_lock)
{
@ -133,6 +133,11 @@ __acquires(&sdp->sd_ail_lock)
continue;
spin_unlock(&sdp->sd_ail_lock);
ret = generic_writepages(mapping, wbc);
if (need_resched()) {
blk_finish_plug(plug);
cond_resched();
blk_start_plug(plug);
}
spin_lock(&sdp->sd_ail_lock);
if (ret == -ENODATA) /* if a jdata write into a new hole */
ret = 0; /* ignore it */
@ -207,7 +212,7 @@ restart:
list_for_each_entry_reverse(tr, head, tr_list) {
if (wbc->nr_to_write <= 0)
break;
ret = gfs2_ail1_start_one(sdp, wbc, tr);
ret = gfs2_ail1_start_one(sdp, wbc, tr, &plug);
if (ret) {
if (ret == -EBUSY)
goto restart;