btrfs: don't access the bio directly in the direct I/O code

Just use bio_for_each_segment_all to iterate over all segments.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 0b836737d3827a8fe25e0e7bff720a32f07391b3..c96d94ef846df393bbc108f811bc5e5f31e1b0f1 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8334,7 +8334,7 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
        struct btrfs_root *root = BTRFS_I(inode)->root;
        struct bio *bio;
        struct bio *orig_bio = dip->orig_bio;
-       struct bio_vec *bvec = orig_bio->bi_io_vec;
+       struct bio_vec *bvec;
        u64 start_sector = orig_bio->bi_iter.bi_sector;
        u64 file_offset = dip->logical_offset;
        u64 submit_len = 0;
@@ -8343,7 +8343,7 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
        int async_submit = 0;
        int nr_sectors;
        int ret;
-       int i;
+       int i, j;
 
        map_length = orig_bio->bi_iter.bi_size;
        ret = btrfs_map_block(root->fs_info, btrfs_op(orig_bio),
@@ -8373,7 +8373,7 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
        btrfs_io_bio(bio)->logical = file_offset;
        atomic_inc(&dip->pending_bios);
 
-       while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) {
+       bio_for_each_segment_all(bvec, orig_bio, j) {
                nr_sectors = BTRFS_BYTES_TO_BLKS(root->fs_info, bvec->bv_len);
                i = 0;
 next_block:
@@ -8427,7 +8427,6 @@ next_block:
                                i++;
                                goto next_block;
                        }
-                       bvec++;
                }
        }