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| author | Zheng Liu <wenqing.lz@taobao.com> | 2011-10-28 20:34:02 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-07 12:32:53 -0800 |
| commit | 177353670085c14e1d358db8bf812bd72a9268c7 (patch) | |
| tree | 5f56929e14343815fea7ee7361fdc342cc5b0401 | |
| parent | bfd62064efe736c254679f66ee37cf087ad60a72 (diff) | |
| download | linux-stable-177353670085c14e1d358db8bf812bd72a9268c7.tar.gz linux-stable-177353670085c14e1d358db8bf812bd72a9268c7.tar.bz2 linux-stable-177353670085c14e1d358db8bf812bd72a9268c7.zip | |
ext4: fix BUG_ON() in ext4_ext_insert_extent()
Does not corrispond with a direct commit in Linus's tree as it was fixed
differently in the 3.0 release.
We will meet with a BUG_ON() if following script is run.
mkfs.ext4 -b 4096 /dev/sdb1 1000000
mount -t ext4 /dev/sdb1 /mnt/sdb1
fallocate -l 100M /mnt/sdb1/test
sync
for((i=0;i<170;i++))
do
dd if=/dev/zero of=/mnt/sdb1/test conv=notrunc bs=256k count=1
seek=`expr $i \* 2`
done
umount /mnt/sdb1
mount -t ext4 /dev/sdb1 /mnt/sdb1
dd if=/dev/zero of=/mnt/sdb1/test conv=notrunc bs=256k count=1 seek=341
umount /mnt/sdb1
mount /dev/sdb1 /mnt/sdb1
dd if=/dev/zero of=/mnt/sdb1/test conv=notrunc bs=256k count=1 seek=340
sync
The reason is that it forgot to mark dirty when splitting two extents in
ext4_ext_convert_to_initialized(). Althrough ex has been updated in
memory, it is not dirtied both in ext4_ext_convert_to_initialized() and
ext4_ext_insert_extent(). The disk layout is corrupted. Then it will
meet with a BUG_ON() when writting at the start of that extent again.
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Xiaoyun Mao <xiaoyun.maoxy@aliyun-inc.com>
Cc: Yingbin Wang <yingbin.wangyb@aliyun-inc.com>
Cc: Jia Wan <jia.wanj@aliyun-inc.com>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/ext4/extents.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index f37555909872..93f7999a0920 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -2592,6 +2592,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle, ex1 = ex; ex1->ee_len = cpu_to_le16(iblock - ee_block); ext4_ext_mark_uninitialized(ex1); + ext4_ext_dirty(handle, inode, path + depth); ex2 = &newex; } /* |