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btrfs: Better csum error message for data csum mismatch

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The original csum error message only outputs inode number, offset, check
sum and expected check sum.

However no root objectid is outputted, which sometimes makes debugging
quite painful under multi-subvolume case (including relocation).

Also the checksum output is decimal, which seldom makes sense for
users/developers and is hard to read in most time.

This patch will add root objectid, which will be %lld for rootid larger
than LAST_FREE_OBJECTID, and hex csum output for better readability.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2017-02-09 10:45:06 +08:00 committed by David Sterba
parent fe01aa6538
commit 6f6b643e44
3 changed files with 22 additions and 7 deletions
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18
fs/btrfs/btrfs_inode.h
View file

@ -324,6 +324,24 @@ static inline void btrfs_inode_resume_unlocked_dio(struct inode *inode)
&BTRFS_I(inode)->runtime_flags);
}
static inline void btrfs_print_data_csum_error(struct inode *inode,
u64 logical_start, u32 csum, u32 csum_expected, int mirror_num)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
/* Output minus objectid, which is more meaningful */
if (root->objectid >= BTRFS_LAST_FREE_OBJECTID)
btrfs_warn_rl(root->fs_info,
"csum failed root %lld ino %lld off %llu csum 0x%08x expected csum 0x%08x mirror %d",
root->objectid, btrfs_ino(BTRFS_I(inode)),
logical_start, csum, csum_expected, mirror_num);
else
btrfs_warn_rl(root->fs_info,
"csum failed root %llu ino %llu off %llu csum 0x%08x expected csum 0x%08x mirror %d",
root->objectid, btrfs_ino(BTRFS_I(inode)),
logical_start, csum, csum_expected, mirror_num);
}
bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end);
#endif

6
fs/btrfs/compression.c
View file

@ -124,10 +124,8 @@ static int check_compressed_csum(struct inode *inode,
kunmap_atomic(kaddr);
if (csum != *cb_sum) {
btrfs_info(BTRFS_I(inode)->root->fs_info,
"csum failed ino %llu extent %llu csum %u wanted %u mirror %d",
btrfs_ino(BTRFS_I(inode)), disk_start, csum, *cb_sum,
cb->mirror_num);
btrfs_print_data_csum_error(inode, disk_start, csum,
*cb_sum, cb->mirror_num);
ret = -EIO;
goto fail;
}

5
fs/btrfs/inode.c
View file

@ -3086,9 +3086,8 @@ static int __readpage_endio_check(struct inode *inode,
kunmap_atomic(kaddr);
return 0;
zeroit:
btrfs_warn_rl(BTRFS_I(inode)->root->fs_info,
"csum failed ino %llu off %llu csum %u expected csum %u",
btrfs_ino(BTRFS_I(inode)), start, csum, csum_expected);
btrfs_print_data_csum_error(inode, start, csum, csum_expected,
io_bio->mirror_num);
memset(kaddr + pgoff, 1, len);
flush_dcache_page(page);
kunmap_atomic(kaddr);