exofs: add ->sync_fs

Add a ->sync_fs method for data integrity syncs, and reimplement
->write_super ontop of it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 49e16af4e6194e11942d78037e957e2e179ff2e0..8216c5b77b5325db78970efc711ab3729a1ea46e 100644 (file)
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -200,18 +200,18 @@ static const struct export_operations exofs_export_ops;
 /*
  * Write the superblock to the OSD
  */
-static void exofs_write_super(struct super_block *sb)
+static int exofs_sync_fs(struct super_block *sb, int wait)
 {
        struct exofs_sb_info *sbi;
        struct exofs_fscb *fscb;
        struct osd_request *or;
        struct osd_obj_id obj;
-       int ret;
+       int ret = -ENOMEM;
 
        fscb = kzalloc(sizeof(struct exofs_fscb), GFP_KERNEL);
        if (!fscb) {
                EXOFS_ERR("exofs_write_super: memory allocation failed.\n");
-               return;
+               return -ENOMEM;
        }
 
        lock_super(sb);
@@ -249,6 +249,15 @@ out:
        unlock_kernel();
        unlock_super(sb);
        kfree(fscb);
+       return ret;
+}
+
+static void exofs_write_super(struct super_block *sb)
+{
+       if (!(sb->s_flags & MS_RDONLY))
+               exofs_sync_fs(sb, 1);
+       else
+               sb->s_dirt = 0;
 }
 
 /*
@@ -493,6 +502,7 @@ static const struct super_operations exofs_sops = {
        .delete_inode   = exofs_delete_inode,
        .put_super      = exofs_put_super,
        .write_super    = exofs_write_super,
+       .sync_fs        = exofs_sync_fs,
        .statfs         = exofs_statfs,
 };