Commit 7ffd27e3 authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
Browse files

btrfs: pass bio_offset to check_data_csum() directly 



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: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarQu Wenruo <wqu@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 1941b64b

fs/btrfs/ctree.h

+1 −1
Original line number Diff line number Diff line
@@ -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);

fs/btrfs/extent_io.c

+20 −12
Original line number Diff line number Diff line
@@ -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 @@ readpage_ok: 
			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);

fs/btrfs/extent_io.h

+1 −1
Original line number Diff line number Diff line
@@ -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);

fs/btrfs/inode.c

+20 −12
Original line number Diff line number Diff line
@@ -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 @@ zeroit: 
}



/*

 * 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;

		}

	}

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