[PATCH] exofs: exofs_file_fsync correctness

[Boaz Harrosh <bharrosh@panasas.com>]

As per Christoph advise: no need to call filemap_write_and_wait().
In exofs all metadata is at the inode so just writing the pages
and inode is all is needed. fsync implies this must be done
synchronously.

FIXME: remove the sb_sync and fix that sb_update better.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 fs/exofs/file.c |   21 ++++++++++++---------
 1 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/fs/exofs/file.c b/fs/exofs/file.c
index f9bfe2b..54bb17d 100644
--- a/fs/exofs/file.c
+++ b/fs/exofs/file.c
@@ -30,9 +30,6 @@
  * along with exofs; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
-
-#include <linux/buffer_head.h>
-
 #include "exofs.h"
 
 static int exofs_release_file(struct inode *inode, struct file *filp)
@@ -40,19 +37,25 @@ static int exofs_release_file(struct inode *inode, struct file *filp)
 	return 0;
 }
 
+/* exofs_file_fsync - flush the inode to disk
+ *
+ *   @datasync is not used. All metadata is written in one place regardless.
+ *   the writeout is synchronous
+ */
 static int exofs_file_fsync(struct file *filp, int datasync)
 {
 	int ret;
 	struct address_space *mapping = filp->f_mapping;
 	struct inode *inode = mapping->host;
 	struct super_block *sb;
+	struct writeback_control wbc = {
+		.sync_mode = WB_SYNC_ALL,
+		.nr_to_write = LONG_MAX,
+		.range_start = 0,
+		.range_end = LLONG_MAX,
+	};
 
-	ret = filemap_write_and_wait(mapping);
-	if (ret)
-		return ret;
-
-	/* sync the inode attributes */
-	ret = write_inode_now(inode, 1);
+	ret = sync_inode(inode, &wbc);
 
 	/* This is a good place to write the sb */
 	/* TODO: Sechedule an sb-sync on create */
-- 
1.6.6.1