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GFS2: Use filemap_fdatawrite() to write back the AIL

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In order to ensure that the mapping stats (and thus the bdi) are correctly
updated, this patch changes the AIL writeback to use the filemap_datawrite
function. This helps prevent stalls in balance_dirty_pages() due to
large amounts of dirty metadata when there is little or no dirty data
around.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2011-03-30 16:25:51 +01:00
parent 1027efaa23
commit 5ac048bb7e
1 changed files with 5 additions and 10 deletions
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15
fs/gfs2/log.c
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@ -91,6 +91,7 @@ static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
__releases(&sdp->sd_ail_lock)
__acquires(&sdp->sd_ail_lock)
{
struct gfs2_glock *gl = NULL;
struct gfs2_bufdata *bd, *s;
struct buffer_head *bh;
int retry;
@ -113,19 +114,13 @@ __acquires(&sdp->sd_ail_lock)
if (!buffer_dirty(bh))
continue;
if (gl == bd->bd_gl)
continue;
gl = bd->bd_gl;
list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
get_bh(bh);
spin_unlock(&sdp->sd_ail_lock);
lock_buffer(bh);
if (test_clear_buffer_dirty(bh)) {
bh->b_end_io = end_buffer_write_sync;
submit_bh(WRITE_SYNC, bh);
} else {
unlock_buffer(bh);
brelse(bh);
}
filemap_fdatawrite(gfs2_glock2aspace(gl));
spin_lock(&sdp->sd_ail_lock);
retry = 1;