linux-kernel - [PATCH] UBIFS: do not write orphans back

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Date:	Wed, 13 Aug 2008 13:17:38 +0300
From:	Artem Bityutskiy <dedekind@...radead.org>
To:	linux-kernel@...r.kernel.org
Cc:	Adrian Hunter <ext-adrian.hunter@...ia.com>,
	Zoltan Sogor <weth@....u-szeged.hu>,
	Christoph Hellwig <hch@....de>
Subject: [PATCH] UBIFS: do not write orphans back

From: Artem Bityutskiy <Artem.Bityutskiy@...ia.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@...ia.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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