GFS2: Make writeback more responsive to system conditions

This patch adds writeback_control to writing back the AIL
list. This means that we can then take advantage of the
information we get in ->write_inode() in order to set off
some pre-emptive writeback.

In addition, the AIL code is cleaned up a bit to make it
a bit simpler to understand.

There is still more which can usefully be done in this area,
but this is a good start at least.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 215c37bfc2a4..58fe3a4ac829 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -23,6 +23,7 @@
 #include <linux/time.h>
 #include <linux/wait.h>
 #include <linux/writeback.h>
+#include <linux/backing-dev.h>
 
 #include "gfs2.h"
 #include "incore.h"
@@ -714,6 +715,7 @@ static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
         struct gfs2_inode *ip = GFS2_I(inode);
         struct gfs2_sbd *sdp = GFS2_SB(inode);
         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
+        struct backing_dev_info *bdi = metamapping->backing_dev_info;
         struct gfs2_holder gh;
         struct buffer_head *bh;
         struct timespec atime;
@@ -747,6 +749,8 @@ do_flush:
         if (wbc->sync_mode == WB_SYNC_ALL)
                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
         filemap_fdatawrite(metamapping);
+        if (bdi->dirty_exceeded)
+                gfs2_ail1_flush(sdp, wbc);
         if (!ret && (wbc->sync_mode == WB_SYNC_ALL))
                 ret = filemap_fdatawait(metamapping);
         if (ret)
@@ -1366,7 +1370,8 @@ static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
         if (error)
                 goto out_rindex_relse;
 
-        error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
+        error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
+                                 sdp->sd_jdesc->jd_blocks);
         if (error)
                 goto out_rg_gunlock;