btrfs: calculate end of bio offset properly
Use the bvec offset and len members to prepare for multipage bvecs.
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: David Sterba <[email protected]>
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 1a618cb..ae4c000 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -445,6 +445,13 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
return 0;
}
+static u64 bio_end_offset(struct bio *bio)
+{
+ struct bio_vec *last = &bio->bi_io_vec[bio->bi_vcnt - 1];
+
+ return page_offset(last->bv_page) + last->bv_len + last->bv_offset;
+}
+
static noinline int add_ra_bio_pages(struct inode *inode,
u64 compressed_end,
struct compressed_bio *cb)
@@ -463,8 +470,7 @@ static noinline int add_ra_bio_pages(struct inode *inode,
u64 end;
int misses = 0;
- page = cb->orig_bio->bi_io_vec[cb->orig_bio->bi_vcnt - 1].bv_page;
- last_offset = (page_offset(page) + PAGE_SIZE);
+ last_offset = bio_end_offset(cb->orig_bio);
em_tree = &BTRFS_I(inode)->extent_tree;
tree = &BTRFS_I(inode)->io_tree;
