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, 3 insertions, 2 deletions

diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index 34501b64bc47..65978d7885c8 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -82,7 +82,7 @@ static int gfs2_set_mode(struct inode *inode, umode_t mode)
                 iattr.ia_valid = ATTR_MODE;
                 iattr.ia_mode = mode;
 
-                error = gfs2_setattr_simple(GFS2_I(inode), &iattr);
+                error = gfs2_setattr_simple(inode, &iattr);
         }
 
         return error;
@@ -160,6 +160,7 @@ out:
 
 int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
 {
+        struct inode *inode = &ip->i_inode;
         struct posix_acl *acl;
         char *data;
         unsigned int len;
@@ -169,7 +170,7 @@ int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
         if (IS_ERR(acl))
                 return PTR_ERR(acl);
         if (!acl)
-                return gfs2_setattr_simple(ip, attr);
+                return gfs2_setattr_simple(inode, attr);
 
         error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
         if (error)