[PATCH version 2] exofs: Avoid using file_fsync()

[Boaz Harrosh <bharrosh@panasas.com>]

I'll test with below patch and also with Christoph version which
does:

diff --git a/fs/exofs/file.c b/fs/exofs/file.c
index 0c13650..2c8abdd 100644
--- a/fs/exofs/file.c
+++ b/fs/exofs/file.c
@@ -46,16 +46,10 @@ static int exofs_file_fsync(struct file *filp, struct dentry *dentry,
 			    int datasync)
 {
 	int ret;
-	struct address_space *mapping = filp->f_mapping;
 	struct inode * inode = dentry->d_inode;
 	struct super_block * sb;
 
-	ret = filemap_write_and_wait(mapping);
-	if (ret)
-		return ret;
-
-	/* sync the inode attributes */
-	ret = write_inode_now(inode, 1);
+	ret = simple_fsync(filp, dentry, 1);
 
 	/* This is a good place to write the sb */
 	/* TODO: Sechedule an sb-sync on create */

On top of the below one. See which one feels better. What should I test for?

Thanks
Boaz

---
The use of file_fsync() in exofs_file_sync() is not necessary since it
does some extra stuff not used by exofs. Open code just the parts that
are currently needed.

TODO: Farther optimization can be done to sync the sb only on inode
update of new files, Usually the sb update is not needed in exofs.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 fs/exofs/exofs.h |    3 +++
 fs/exofs/file.c  |   17 ++++++++++++-----
 fs/exofs/super.c |    2 +-
 3 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index 0fd4c78..5d15512 100644
--- a/fs/exofs/exofs.h
+++ b/fs/exofs/exofs.h
@@ -156,6 +156,9 @@ ino_t exofs_parent_ino(struct dentry *child);
 int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
 		    struct inode *);
 
+/* super.c               */
+int exofs_sync_fs(struct super_block *sb, int wait);
+
 /*********************
  * operation vectors *
  *********************/
diff --git a/fs/exofs/file.c b/fs/exofs/file.c
index 6ed7fe4..0c13650 100644
--- a/fs/exofs/file.c
+++ b/fs/exofs/file.c
@@ -47,16 +47,23 @@ static int exofs_file_fsync(struct file *filp, struct dentry *dentry,
 {
 	int ret;
 	struct address_space *mapping = filp->f_mapping;
+	struct inode * inode = dentry->d_inode;
+	struct super_block * sb;
 
 	ret = filemap_write_and_wait(mapping);
 	if (ret)
 		return ret;
 
-	/*Note: file_fsync below also calles sync_blockdev, which is a no-op
-	 *      for exofs, but other then that it does sync_inode and
-	 *      sync_superblock which is what we need here.
-	 */
-	return file_fsync(filp, dentry, datasync);
+	/* sync the inode attributes */
+	ret = write_inode_now(inode, 1);
+
+	/* This is a good place to write the sb */
+	/* TODO: Sechedule an sb-sync on create */
+	sb = inode->i_sb;
+	if (sb->s_dirt)
+		exofs_sync_fs(sb, 1);
+
+	return ret;
 }
 
 static int exofs_flush(struct file *file, fl_owner_t id)
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 8216c5b..e4fa0ce 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -200,7 +200,7 @@ static const struct export_operations exofs_export_ops;
 /*
  * Write the superblock to the OSD
  */
-static int exofs_sync_fs(struct super_block *sb, int wait)
+int exofs_sync_fs(struct super_block *sb, int wait)
 {
 	struct exofs_sb_info *sbi;
 	struct exofs_fscb *fscb;
-- 
1.6.2.1