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btrfs: add a btrfs_data_csum_ok helper

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Add a new checksumming helper that wraps btrfs_check_data_csum and
does all the checks to if we're dealing with some form of nodatacsum
I/O.  This helper will be used by the new storage layer checksum
validation and repair code.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Christoph Hellwig 2023-01-21 07:50:06 +01:00 committed by David Sterba
parent 1c2b3ee3b0
commit e52190441b
2 changed files with 40 additions and 0 deletions
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2
fs/btrfs/btrfs_inode.h
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@ -423,6 +423,8 @@ int btrfs_check_sector_csum(struct btrfs_fs_info *fs_info, struct page *page,
u32 pgoff, u8 *csum, const u8 * const csum_expected);
int btrfs_check_data_csum(struct btrfs_inode *inode, struct btrfs_bio *bbio,
u32 bio_offset, struct page *page, u32 pgoff);
bool btrfs_data_csum_ok(struct btrfs_bio *bbio, struct btrfs_device *dev,
u32 bio_offset, struct bio_vec *bv);
unsigned int btrfs_verify_data_csum(struct btrfs_bio *bbio,
u32 bio_offset, struct page *page,
u64 start, u64 end);

38
fs/btrfs/inode.c
View file

@ -3495,6 +3495,44 @@ int btrfs_check_data_csum(struct btrfs_inode *inode, struct btrfs_bio *bbio,
return -EIO;
}
/*
* Verify the checksum of a single data sector.
*
* @bbio: btrfs_io_bio which contains the csum
* @dev: device the sector is on
* @bio_offset: offset to the beginning of the bio (in bytes)
* @bv: bio_vec to check
*
* Check if the checksum on a data block is valid. When a checksum mismatch is
* detected, report the error and fill the corrupted range with zero.
*
* Return %true if the sector is ok or had no checksum to start with, else %false.
*/
bool btrfs_data_csum_ok(struct btrfs_bio *bbio, struct btrfs_device *dev,
u32 bio_offset, struct bio_vec *bv)
{
struct btrfs_inode *inode = bbio->inode;
u64 file_offset = bbio->file_offset + bio_offset;
u64 end = file_offset + bv->bv_len - 1;
if (!bbio->csum)
return true;
if (btrfs_is_data_reloc_root(inode->root) &&
test_range_bit(&inode->io_tree, file_offset, end, EXTENT_NODATASUM,
1, NULL)) {
/* Skip the range without csum for data reloc inode */
clear_extent_bits(&inode->io_tree, file_offset, end,
EXTENT_NODATASUM);
return true;
}
if (btrfs_check_data_csum(inode, bbio, bio_offset, bv->bv_page,
bv->bv_offset) < 0)
return false;
return true;
}
/*
* When reads are done, we need to check csums to verify the data is correct.
* if there's a match, we allow the bio to finish. If not, the code in