This is a note to let you know that I've just added the patch titled
ext4: protect group inode free counting with group lock
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-protect-group-inode-free-counting-with-group-lock.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6f2e9f0e7d795214b9cf5a47724a273b705fd113 Mon Sep 17 00:00:00 2001
From: Tao Ma <boyu.mt@xxxxxxxxxx>
Date: Mon, 28 May 2012 18:20:59 -0400
Subject: ext4: protect group inode free counting with group lock
From: Tao Ma <boyu.mt@xxxxxxxxxx>
commit 6f2e9f0e7d795214b9cf5a47724a273b705fd113 upstream.
Now when we set the group inode free count, we don't have a proper
group lock so that multiple threads may decrease the inode free
count at the same time. And e2fsck will complain something like:
Free inodes count wrong for group #1 (1, counted=0).
Fix? no
Free inodes count wrong for group #2 (3, counted=0).
Fix? no
Directories count wrong for group #2 (780, counted=779).
Fix? no
Free inodes count wrong for group #3 (2272, counted=2273).
Fix? no
So this patch try to protect it with the ext4_lock_group.
btw, it is found by xfstests test case 269 and the volume is
mkfsed with the parameter
"-O ^resize_inode,^uninit_bg,extent,meta_bg,flex_bg,ext_attr"
and I have run it 100 times and the error in e2fsck doesn't
show up again.
Signed-off-by: Tao Ma <boyu.mt@xxxxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Signed-off-by: Benjamin LaHaise <bcrl@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/ialloc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -778,6 +778,8 @@ got:
ext4_itable_unused_set(sb, gdp,
(EXT4_INODES_PER_GROUP(sb) - ino));
up_read(&grp->alloc_sem);
+ } else {
+ ext4_lock_group(sb, group);
}
ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1);
if (S_ISDIR(mode)) {
@@ -790,8 +792,8 @@ got:
}
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp);
- ext4_unlock_group(sb, group);
}
+ ext4_unlock_group(sb, group);
BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata");
err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh);
Patches currently in stable-queue which might be from boyu.mt@xxxxxxxxxx are
queue-3.4/ext4-protect-group-inode-free-counting-with-group-lock.patch
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