btrfs: use on-stack bio in scrub_recheck_block

The I/O in repair_io_failue is synchronous and doesn't need a btrfs_bio,
so just use an on-stack bio.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index d78dbe5..5560231 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1458,8 +1458,9 @@ static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
                return scrub_recheck_block_on_raid56(fs_info, sblock);
 
        for (i = 0; i < sblock->sector_count; i++) {
-               struct bio *bio;
                struct scrub_sector *sector = sblock->sectors[i];
+               struct bio bio;
+               struct bio_vec bvec;
 
                if (sector->dev->bdev == NULL) {
                        sector->io_error = 1;
@@ -1468,20 +1469,17 @@ static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
                }
 
                WARN_ON(!sector->page);
-               bio = btrfs_bio_alloc(1);
-               bio_set_dev(bio, sector->dev->bdev);
-
-               bio_add_page(bio, sector->page, fs_info->sectorsize, 0);
-               bio->bi_iter.bi_sector = sector->physical >> 9;
-               bio->bi_opf = REQ_OP_READ;
+               bio_init(&bio, sector->dev->bdev, &bvec, 1, REQ_OP_READ);
+               bio_add_page(&bio, sector->page, fs_info->sectorsize, 0);
+               bio.bi_iter.bi_sector = sector->physical >> 9;
 
-               btrfsic_check_bio(bio);
-               if (submit_bio_wait(bio)) {
+               btrfsic_check_bio(&bio);
+               if (submit_bio_wait(&bio)) {
                        sector->io_error = 1;
                        sblock->no_io_error_seen = 0;
                }
 
-               bio_put(bio);
+               bio_uninit(&bio);
        }
 
        if (sblock->no_io_error_seen)