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authorTheodore Ts'o <tytso@mit.edu>2012-10-10 01:06:58 -0400
committerTheodore Ts'o <tytso@mit.edu>2012-10-10 01:06:58 -0400
commit06db49e68ae70cf16819b85a14057acb2820776a (patch)
tree4b9ac4222aef2c6605ffea5e0986b91be6e2c797 /fs/ext4/ext4.h
parentdee1f973ca341c266229faa5a1a5bb268bed3531 (diff)
ext4: fix metadata checksum calculation for the superblock
The function ext4_handle_dirty_super() was calculating the superblock on the wrong block data. As a result, when the superblock is modified while it is mounted (most commonly, when inodes are added or removed from the orphan list), the superblock checksum would be wrong. We didn't notice because the superblock *was* being correctly calculated in ext4_commit_super(), and this would get called when the file system was unmounted. So the problem only became obvious if the system crashed while the file system was mounted. Fix this by removing the poorly designed function signature for ext4_superblock_csum_set(); if it only took a single argument, the pointer to a struct superblock, the ambiguity which caused this mistake would have been impossible. Reported-by: George Spelvin <linux@horizon.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/ext4.h')
-rw-r--r--fs/ext4/ext4.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 3ab2539b7b2..78971cfd9c7 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2063,8 +2063,7 @@ extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
extern int ext4_calculate_overhead(struct super_block *sb);
extern int ext4_superblock_csum_verify(struct super_block *sb,
struct ext4_super_block *es);
-extern void ext4_superblock_csum_set(struct super_block *sb,
- struct ext4_super_block *es);
+extern void ext4_superblock_csum_set(struct super_block *sb);
extern void *ext4_kvmalloc(size_t size, gfp_t flags);
extern void *ext4_kvzalloc(size_t size, gfp_t flags);
extern void ext4_kvfree(void *ptr);