[PATCH v3 03/15] btrfs: inode: make btrfs_verify_data_csum() follow sector size

[Qu Wenruo <wqu@suse.com>]

Currently btrfs_verify_data_csum() just pass the whole page to
check_data_csum(), which is fine since we only support sectorsize ==
PAGE_SIZE.

To support subpage, we need to properly honor per-sector
checksum verification, just like what we did in dio read path.

This patch will do the csum verification in a for loop, starts with
pg_off == start - page_offset(page), with sectorsize increasement for
each loop.

For sectorsize == PAGE_SIZE case, the pg_off will always be 0, and we
will only finish with just one loop.

For subpage case, we do the loop to iterate each sector and if we found
any error, we return error.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/inode.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5c051b0e58a5..255ea28982ff 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2951,7 +2951,7 @@ void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start,
  * The length of such check is always one sector size.
  */
 static int check_data_csum(struct inode *inode, struct btrfs_io_bio *io_bio,
-			   u32 bio_offset, struct page *page, int pgoff)
+			   u32 bio_offset, struct page *page, u32 pgoff)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 	SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
@@ -3002,10 +3002,11 @@ static int check_data_csum(struct inode *inode, struct btrfs_io_bio *io_bio,
 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);
 	struct inode *inode = page->mapping->host;
 	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 	struct btrfs_root *root = BTRFS_I(inode)->root;
+	const u32 sectorsize = root->fs_info->sectorsize;
+	u32 pg_off;
 
 	if (PageChecked(page)) {
 		ClearPageChecked(page);
@@ -3024,7 +3025,18 @@ int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u32 bio_offset,
 		return 0;
 	}
 
-	return check_data_csum(inode, io_bio, bio_offset, page, offset);
+	ASSERT(page_offset(page) <= start &&
+	       end <= page_offset(page) + PAGE_SIZE - 1);
+	for (pg_off = offset_in_page(start);
+	     pg_off < offset_in_page(end);
+	     pg_off += sectorsize, bio_offset += sectorsize) {
+		int ret;
+
+		ret = check_data_csum(inode, io_bio, bio_offset, page, pg_off);
+		if (ret < 0)
+			return -EIO;
+	}
+	return 0;
 }
 
 /*
-- 
2.29.2