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btrfs: pass bio_offset to check_data_csum() directly

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Parameter icsum for check_data_csum() is a little hard to understand.
So is the phy_offset for btrfs_verify_data_csum().

Both parameters are calculated values for csum lookup.

Instead of some calculated value, just pass bio_offset and let the
final and only user, check_data_csum(), calculate whatever it needs.

Since we are here, also make the bio_offset parameter and some related
variables to be u32 (unsigned int).
As bio size is limited by its bi_size, which is unsigned int, and has
extra size limit check during various bio operations.
Thus we are ensured that bio_offset won't overflow u32.

Thus for all involved functions, not only rename the parameter from
@phy_offset to @bio_offset, but also reduce its width to u32, so we
won't have suspicious "u32 = u64 >> sector_bits;" lines anymore.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2020-12-02 14:47:58 +08:00 committed by David Sterba
parent 1941b64b08
commit 7ffd27e378
4 changed files with 42 additions and 26 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
fs/btrfs/ctree.h
View file

@ -3052,7 +3052,7 @@ u64 btrfs_file_extent_end(const struct btrfs_path *path);
/* inode.c */
blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
int mirror_num, unsigned long bio_flags);
int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u64 phy_offset,
int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u32 bio_offset,
struct page *page, u64 start, u64 end, int mirror);
struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
u64 start, u64 len);

32
fs/btrfs/extent_io.c
View file

@ -2634,7 +2634,7 @@ static bool btrfs_io_needs_validation(struct inode *inode, struct bio *bio)
}
blk_status_t btrfs_submit_read_repair(struct inode *inode,
struct bio *failed_bio, u64 phy_offset,
struct bio *failed_bio, u32 bio_offset,
struct page *page, unsigned int pgoff,
u64 start, u64 end, int failed_mirror,
submit_bio_hook_t *submit_bio_hook)
@ -2644,7 +2644,7 @@ blk_status_t btrfs_submit_read_repair(struct inode *inode,
struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
struct btrfs_io_bio *failed_io_bio = btrfs_io_bio(failed_bio);
const int icsum = phy_offset >> fs_info->sectorsize_bits;
const int icsum = bio_offset >> fs_info->sectorsize_bits;
bool need_validation;
struct bio *repair_bio;
struct btrfs_io_bio *repair_io_bio;
@ -2869,10 +2869,11 @@ static void end_bio_extent_readpage(struct bio *bio)
struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
struct extent_io_tree *tree, *failure_tree;
struct processed_extent processed = { 0 };
u64 offset = 0;
u64 start;
u64 end;
u64 len;
/*
* The offset to the beginning of a bio, since one bio can never be
* larger than UINT_MAX, u32 here is enough.
*/
u32 bio_offset = 0;
int mirror;
int ret;
struct bvec_iter_all iter_all;
@ -2882,7 +2883,10 @@ static void end_bio_extent_readpage(struct bio *bio)
struct page *page = bvec->bv_page;
struct inode *inode = page->mapping->host;
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
u32 sectorsize = fs_info->sectorsize;
const u32 sectorsize = fs_info->sectorsize;
u64 start;
u64 end;
u32 len;
btrfs_debug(fs_info,
"end_bio_extent_readpage: bi_sector=%llu, err=%d, mirror=%u",
@ -2915,8 +2919,9 @@ static void end_bio_extent_readpage(struct bio *bio)
mirror = io_bio->mirror_num;
if (likely(uptodate)) {
if (is_data_inode(inode))
ret = btrfs_verify_data_csum(io_bio, offset, page,
start, end, mirror);
ret = btrfs_verify_data_csum(io_bio,
bio_offset, page, start, end,
mirror);
else
ret = btrfs_validate_metadata_buffer(io_bio,
page, start, end, mirror);
@ -2944,12 +2949,14 @@ static void end_bio_extent_readpage(struct bio *bio)
* If it can't handle the error it will return -EIO and
* we remain responsible for that page.
*/
if (!btrfs_submit_read_repair(inode, bio, offset, page,
if (!btrfs_submit_read_repair(inode, bio, bio_offset,
page,
start - page_offset(page),
start, end, mirror,
btrfs_submit_data_bio)) {
uptodate = !bio->bi_status;
offset += len;
ASSERT(bio_offset + len > bio_offset);
bio_offset += len;
continue;
}
} else {
@ -2974,7 +2981,8 @@ static void end_bio_extent_readpage(struct bio *bio)
if (page->index == end_index && off)
zero_user_segment(page, off, PAGE_SIZE);
}
offset += len;
ASSERT(bio_offset + len > bio_offset);
bio_offset += len;
/* Update page status and unlock */
endio_readpage_update_page_status(page, uptodate);

2
fs/btrfs/extent_io.h
View file

@ -291,7 +291,7 @@ struct io_failure_record {
blk_status_t btrfs_submit_read_repair(struct inode *inode,
struct bio *failed_bio, u64 phy_offset,
struct bio *failed_bio, u32 bio_offset,
struct page *page, unsigned int pgoff,
u64 start, u64 end, int failed_mirror,
submit_bio_hook_t *submit_bio_hook);

32
fs/btrfs/inode.c
View file

@ -2942,28 +2942,30 @@ void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start,
/*
* check_data_csum - verify checksum of one sector of uncompressed data
* @inode: the inode
* @inode: inode
* @io_bio: btrfs_io_bio which contains the csum
* @icsum: checksum index in the io_bio->csum array, size of csum_size
* @bio_offset: offset to the beginning of the bio (in bytes)
* @page: page where is the data to be verified
* @pgoff: offset inside the page
*
* The length of such check is always one sector size.
*/
static int check_data_csum(struct inode *inode, struct btrfs_io_bio *io_bio,
int icsum, struct page *page, int pgoff)
u32 bio_offset, struct page *page, int pgoff)
{
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
char *kaddr;
u32 len = fs_info->sectorsize;
const u32 csum_size = fs_info->csum_size;
unsigned int offset_sectors;
u8 *csum_expected;
u8 csum[BTRFS_CSUM_SIZE];
ASSERT(pgoff + len <= PAGE_SIZE);
csum_expected = ((u8 *)io_bio->csum) + icsum * csum_size;
offset_sectors = bio_offset >> fs_info->sectorsize_bits;
csum_expected = ((u8 *)io_bio->csum) + offset_sectors * csum_size;
kaddr = kmap_atomic(page);
shash->tfm = fs_info->csum_shash;
@ -2988,11 +2990,16 @@ static int check_data_csum(struct inode *inode, struct btrfs_io_bio *io_bio,
}
/*
* when reads are done, we need to check csums to verify the data is correct
* 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
* extent_io.c will try to find good copies for us.
*
* @bio_offset: offset to the beginning of the bio (in bytes)
* @start: file offset of the range start
* @end: file offset of the range end (inclusive)
* @mirror: mirror number
*/
int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u64 phy_offset,
int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u32 bio_offset,
struct page *page, u64 start, u64 end, int mirror)
{
size_t offset = start - page_offset(page);
@ -3017,8 +3024,7 @@ int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u64 phy_offset,
return 0;
}
phy_offset >>= root->fs_info->sectorsize_bits;
return check_data_csum(inode, io_bio, phy_offset, page, offset);
return check_data_csum(inode, io_bio, bio_offset, page, offset);
}
/*
@ -7712,7 +7718,7 @@ static blk_status_t btrfs_check_read_dio_bio(struct inode *inode,
struct bio_vec bvec;
struct bvec_iter iter;
u64 start = io_bio->logical;
int icsum = 0;
u32 bio_offset = 0;
blk_status_t err = BLK_STS_OK;
__bio_for_each_segment(bvec, &io_bio->bio, iter, io_bio->iter) {
@ -7723,8 +7729,8 @@ static blk_status_t btrfs_check_read_dio_bio(struct inode *inode,
for (i = 0; i < nr_sectors; i++) {
ASSERT(pgoff < PAGE_SIZE);
if (uptodate &&
(!csum || !check_data_csum(inode, io_bio, icsum,
bvec.bv_page, pgoff))) {
(!csum || !check_data_csum(inode, io_bio,
bio_offset, bvec.bv_page, pgoff))) {
clean_io_failure(fs_info, failure_tree, io_tree,
start, bvec.bv_page,
btrfs_ino(BTRFS_I(inode)),
@ -7732,6 +7738,7 @@ static blk_status_t btrfs_check_read_dio_bio(struct inode *inode,
} else {
blk_status_t status;
ASSERT((start - io_bio->logical) < UINT_MAX);
status = btrfs_submit_read_repair(inode,
&io_bio->bio,
start - io_bio->logical,
@ -7744,7 +7751,8 @@ static blk_status_t btrfs_check_read_dio_bio(struct inode *inode,
err = status;
}
start += sectorsize;
icsum++;
ASSERT(bio_offset + sectorsize > bio_offset);
bio_offset += sectorsize;
pgoff += sectorsize;
}
}