GFS2: Use ->dirty_inode()

The aim of this patch is to use the newly enhanced ->dirty_inode()
super block operation to deal with atime updates, rather than
piggy backing that code into ->write_inode() as is currently
done.

The net result is a simplification of the code in various places
and a reduction of the number of gfs2_dinode_out() calls since
this is now implied by ->dirty_inode().

Some of the mark_inode_dirty() calls have been moved under glocks
in order to take advantage of then being able to avoid locking in
->dirty_inode() when we already have suitable locks.

One consequence is that generic_write_end() now correctly deals
with file size updates, so that we do not need a separate check
for that afterwards. This also, indirectly, means that fdatasync
should work correctly on GFS2 - the current code always syncs the
metadata whether it needs to or not.

Has survived testing with postmark (with and without atime) and
also fsx.

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

1 files changed, 2 insertions, 11 deletions

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 0e8bb13381e4..3a9a9749f496 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -638,7 +638,7 @@ static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 	unsigned long index = loc >> PAGE_CACHE_SHIFT;
 	unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 	unsigned blocksize, iblock, pos;
-	struct buffer_head *bh, *dibh;
+	struct buffer_head *bh;
 	struct page *page;
 	void *kaddr, *ptr;
 	struct gfs2_quota q, *qp;
@@ -736,22 +736,13 @@ get_a_page:
 		goto get_a_page;
 	}
 
-	/* Update the disk inode timestamp and size (if extended) */
-	err = gfs2_meta_inode_buffer(ip, &dibh);
-	if (err)
-		goto out;
-
 	size = loc + sizeof(struct gfs2_quota);
 	if (size > inode->i_size)
 		i_size_write(inode, size);
 	inode->i_mtime = inode->i_atime = CURRENT_TIME;
-	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-	gfs2_dinode_out(ip, dibh->b_data);
-	brelse(dibh);
 	mark_inode_dirty(inode);
-
-out:
 	return err;
+
 unlock_out:
 	unlock_page(page);
 	page_cache_release(page);