linux-kernel - [ 131/184] ext4: make orphan functions be no-op in no-journal

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Date:	Tue, 04 Jun 2013 19:23:41 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Anatol Pomozov <anatol.pomozov@...il.com>,
	"Theodore Tso" <tytso@....edu>, Willy Tarreau <w@....eu>
Subject: [ 131/184] ext4: make orphan functions be no-op in no-journal

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------
 mode

From: Anatol Pomozov <anatol.pomozov@...il.com>

Instead of checking whether the handle is valid, we check if journal
is enabled. This avoids taking the s_orphan_lock mutex in all cases
when there is no journal in use, including the error paths where
ext4_orphan_del() is called with a handle set to NULL.

Signed-off-by: Anatol Pomozov <anatol.pomozov@...il.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Signed-off-by: Willy Tarreau <w@....eu>
---
 fs/ext4/namei.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 828c9c9..230bef5 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2001,7 +2001,7 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
 	struct ext4_iloc iloc;
 	int err = 0, rc;
 
-	if (!ext4_handle_valid(handle))
+	if (!EXT4_SB(sb)->s_journal)
 		return 0;
 
 	mutex_lock(&EXT4_SB(sb)->s_orphan_lock);
@@ -2082,8 +2082,7 @@ int ext4_orphan_del(handle_t *handle, struct inode *inode)
 	struct ext4_iloc iloc;
 	int err = 0;
 
-	/* ext4_handle_valid() assumes a valid handle_t pointer */
-	if (handle && !ext4_handle_valid(handle))
+	if (!EXT4_SB(inode->i_sb)->s_journal)
 		return 0;
 
 	mutex_lock(&EXT4_SB(inode->i_sb)->s_orphan_lock);
@@ -2102,7 +2101,7 @@ int ext4_orphan_del(handle_t *handle, struct inode *inode)
 	 * transaction handle with which to update the orphan list on
 	 * disk, but we still need to remove the inode from the linked
 	 * list in memory. */
-	if (sbi->s_journal && !handle)
+	if (!handle)
 		goto out;
 
 	err = ext4_reserve_inode_write(handle, inode, &iloc);
-- 
1.7.12.2.21.g234cd45.dirty



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