UBIFS: do not write orphans back

Orphan inodes are deleted inodes which will disappear after FS
re-mount. There is not need to write orphan inodes back, because
they are not needed on the flash media.

So optimize orphans a little by not writing them back. Just mark
them as clean, free the budget, and report success to VFS.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 884beed1dcb8..13e90b0dd95d 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -278,7 +278,7 @@ static void ubifs_destroy_inode(struct inode *inode)
  */
 static int ubifs_write_inode(struct inode *inode, int wait)
 {
-        int err;
+        int err = 0;
         struct ubifs_info *c = inode->i_sb->s_fs_info;
         struct ubifs_inode *ui = ubifs_inode(inode);
 
@@ -299,10 +299,18 @@ static int ubifs_write_inode(struct inode *inode, int wait)
                 return 0;
         }
 
-        dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
-        err = ubifs_jnl_write_inode(c, inode, 0);
-        if (err)
-                ubifs_err("can't write inode %lu, error %d", inode->i_ino, err);
+        /*
+         * As an optimization, do not write orphan inodes to the media just
+         * because this is not needed.
+         */
+        dbg_gen("inode %lu, mode %#x, nlink %u",
+                inode->i_ino, (int)inode->i_mode, inode->i_nlink);
+        if (inode->i_nlink) {
+                err = ubifs_jnl_write_inode(c, inode, 0);
+                if (err)
+                        ubifs_err("can't write inode %lu, error %d",
+                                  inode->i_ino, err);
+        }
 
         ui->dirty = 0;
         mutex_unlock(&ui->ui_mutex);