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| author | Dmitry Monakhov <dmonakhov@openvz.org> | 2014-10-13 11:36:16 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-10-13 11:36:16 +0400 |
| commit | 9aa5d32ba269bec0e7eaba2697a986a7b0bc8528 (patch) | |
| tree | 3702c0a5ff64152ecd33d7469164832a7811f28f /fs/ext4/xattr.c | |
| parent | 65dd8327eb055a393a413a2214f70a9a10ff7ad6 (diff) | |
| download | linux-9aa5d32ba269bec0e7eaba2697a986a7b0bc8528.tar.xz | |
ext4: Replace open coded mdata csum feature to helper function
Besides the fact that this replacement improves code readability
it also protects from errors caused direct EXT4_S(sb)->s_es manipulation
which may result attempt to use uninitialized csum machinery.
#Testcase_BEGIN
IMG=/dev/ram0
MNT=/mnt
mkfs.ext4 $IMG
mount $IMG $MNT
#Enable feature directly on disk, on mounted fs
tune2fs -O metadata_csum $IMG
# Provoke metadata update, likey result in OOPS
touch $MNT/test
umount $MNT
#Testcase_END
# Replacement script
@@
expression E;
@@
- EXT4_HAS_RO_COMPAT_FEATURE(E, EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)
+ ext4_has_metadata_csum(E)
https://bugzilla.kernel.org/show_bug.cgi?id=82201
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/xattr.c')
| -rw-r--r-- | fs/ext4/xattr.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 42823ab3718c..1e09fc77395c 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -142,8 +142,7 @@ static int ext4_xattr_block_csum_verify(struct inode *inode, sector_t block_nr, struct ext4_xattr_header *hdr) { - if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && + if (ext4_has_metadata_csum(inode->i_sb) && (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) return 0; return 1; @@ -153,8 +152,7 @@ static void ext4_xattr_block_csum_set(struct inode *inode, sector_t block_nr, struct ext4_xattr_header *hdr) { - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) + if (!ext4_has_metadata_csum(inode->i_sb)) return; hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); |