This is a note to let you know that I've just added the patch titled
ext4: check s_chksum_driver when looking for bg csum presence
to the 3.14-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-check-s_chksum_driver-when-looking-for-bg-csum-presence.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 813d32f91333e4c33d5a19b67167c4bae42dae75 Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
Date: Tue, 14 Oct 2014 02:35:49 -0400
Subject: ext4: check s_chksum_driver when looking for bg csum presence
From: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
commit 813d32f91333e4c33d5a19b67167c4bae42dae75 upstream.
Convert the ext4_has_group_desc_csum predicate to look for a checksum
driver instead of the metadata_csum flag and change the bg checksum
calculation function to look for GDT_CSUM before taking the crc16
path.
Without this patch, if we mount with ^uninit_bg,^metadata_csum and
later metadata_csum gets turned on by accident, the block group
checksum functions will incorrectly assume that checksumming is
enabled (metadata_csum) but that crc16 should be used
(!s_chksum_driver). This is totally wrong, so fix the predicate
and the checksum formula selection.
(Granted, if the metadata_csum feature bit gets enabled on a live FS
then something underhanded is going on, but we could at least avoid
writing garbage into the on-disk fields.)
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Reviewed-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/ext4.h | 4 ++--
fs/ext4/super.c | 4 ++++
2 files changed, 6 insertions(+), 2 deletions(-)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2341,8 +2341,8 @@ extern int ext4_register_li_request(stru
static inline int ext4_has_group_desc_csum(struct super_block *sb)
{
return EXT4_HAS_RO_COMPAT_FEATURE(sb,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
- EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM) ||
+ (EXT4_SB(sb)->s_chksum_driver != NULL);
}
static inline int ext4_has_metadata_csum(struct super_block *sb)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2019,6 +2019,10 @@ static __le16 ext4_group_desc_csum(struc
}
/* old crc16 code */
+ if (!(sbi->s_es->s_feature_ro_compat &
+ cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
+ return 0;
+
offset = offsetof(struct ext4_group_desc, bg_checksum);
crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
Patches currently in stable-queue which might be from darrick.wong@xxxxxxxxxx are
queue-3.14/ext4-check-s_chksum_driver-when-looking-for-bg-csum-presence.patch
queue-3.14/ext4-check-ea-value-offset-when-loading.patch
queue-3.14/jbd2-free-bh-when-descriptor-block-checksum-fails.patch
queue-3.14/ext4-enable-journal-checksum-when-metadata-checksum-feature-enabled.patch
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