btrfs: use on-stack bio in scrub_repair_page_from_good_copy

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 5560231..967749d 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1538,7 +1538,8 @@ static int scrub_repair_sector_from_good_copy(struct scrub_block *sblock_bad,
        BUG_ON(sector_good->page == NULL);
        if (force_write || sblock_bad->header_error ||
            sblock_bad->checksum_error || sector_bad->io_error) {
-               struct bio *bio;
+               struct bio bio;
+               struct bio_vec bvec;
                int ret;
 
                if (!sector_bad->dev->bdev) {
@@ -1547,26 +1548,20 @@ static int scrub_repair_sector_from_good_copy(struct scrub_block *sblock_bad,
                        return -EIO;
                }
 
-               bio = btrfs_bio_alloc(1);
-               bio_set_dev(bio, sector_bad->dev->bdev);
-               bio->bi_iter.bi_sector = sector_bad->physical >> 9;
-               bio->bi_opf = REQ_OP_WRITE;
+               bio_init(&bio, sector_bad->dev->bdev, &bvec, 1, REQ_OP_WRITE);
+               bio.bi_iter.bi_sector = sector_bad->physical >> 9;
+               __bio_add_page(&bio, sector_good->page, sectorsize, 0);
 
-               ret = bio_add_page(bio, sector_good->page, sectorsize, 0);
-               if (ret != sectorsize) {
-                       bio_put(bio);
-                       return -EIO;
-               }
+               btrfsic_check_bio(&bio);
+               ret = submit_bio_wait(&bio);
+               bio_uninit(&bio);
 
-               btrfsic_check_bio(bio);
-               if (submit_bio_wait(bio)) {
+               if (ret) {
                        btrfs_dev_stat_inc_and_print(sector_bad->dev,
                                BTRFS_DEV_STAT_WRITE_ERRS);
                        atomic64_inc(&fs_info->dev_replace.num_write_errors);
-                       bio_put(bio);
                        return -EIO;
                }
-               bio_put(bio);
        }
 
        return 0;