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Subject[PATCH] UBIFS: do not write orphans back
Date
From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

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>
---
fs/ubifs/super.c | 18 +++++++++++++-----
1 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 884beed..13e90b0 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);
--
1.5.4.1


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