This is a note to let you know that we have just queued up the patch titled
Subject: ext4: add checksum calculation when clearing UNINIT flag in ext4_new_inode
to the 2.6.27-stable tree. Its filename is
ext4-add-checksum-calculation-when-clearing-uninit-flag-in-ext4_new_inode.patch
A git repo of this tree can be found at
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>From tytso@xxxxxxx Wed Dec 3 10:45:18 2008
From: Frederic Bohe <frederic.bohe@xxxxxxxx>
Date: Sun, 16 Nov 2008 11:05:40 -0500
Subject: ext4: add checksum calculation when clearing UNINIT flag in ext4_new_inode
To: stable@xxxxxxxxxx
Cc: Frederic Bohe <frederic.bohe@xxxxxxxx>, Ext4 Developers List <linux-ext4@xxxxxxxxxxxxxxx>, "Theodore Ts'o" <tytso@xxxxxxx>
Message-ID: <1226851540-8032-21-git-send-email-tytso@xxxxxxx>
From: Frederic Bohe <frederic.bohe@xxxxxxxx>
(cherry picked from commit 23712a9c28b9f80a8cf70c8490358d5f562d2465)
When initializing an uninitialized block group in ext4_new_inode(),
its block group checksum must be re-calculated. This fixes a race
when several threads try to allocate a new inode in an UNINIT'd group.
There is some question whether we need to be initializing the block
bitmap in ext4_new_inode() at all, but for now, if we are going to
init the block group, let's eliminate the race.
Signed-off-by: Frederic Bohe <frederic.bohe@xxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
fs/ext4/ialloc.c | 2 ++
1 file changed, 2 insertions(+)
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -717,6 +717,8 @@ got:
gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
free = ext4_free_blocks_after_init(sb, group, gdp);
gdp->bg_free_blocks_count = cpu_to_le16(free);
+ gdp->bg_checksum = ext4_group_desc_csum(sbi, group,
+ gdp);
}
spin_unlock(sb_bgl_lock(sbi, group));
Patches currently in stable-queue which might be from frederic.bohe@xxxxxxxx are
queue-2.6.27/ext4-update-flex_bg-free-blocks-and-free-inodes-counters-when-resizing.patch
queue-2.6.27/ext4-fix-initialization-of-uninit-bitmap-blocks.patch
queue-2.6.27/ext4-add-checksum-calculation-when-clearing-uninit-flag-in-ext4_new_inode.patch
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
