1 files changed, 11 insertions, 15 deletions

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 90acc82046c3..2f3d6f917fb3 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -998,6 +998,7 @@ static int scrub_setup_recheck_block(struct scrub_dev *sdev,
                         page = sblock->pagev + page_index;
                         page->logical = logical;
                         page->physical = bbio->stripes[mirror_index].physical;
+                        /* for missing devices, bdev is NULL */
                         page->bdev = bbio->stripes[mirror_index].dev->bdev;
                         page->mirror_num = mirror_index + 1;
                         page->page = alloc_page(GFP_NOFS);
@@ -1042,8 +1043,16 @@ static int scrub_recheck_block(struct btrfs_fs_info *fs_info,
                 struct scrub_page *page = sblock->pagev + page_num;
                 DECLARE_COMPLETION_ONSTACK(complete);
 
+                if (page->bdev == NULL) {
+                        page->io_error = 1;
+                        sblock->no_io_error_seen = 0;
+                        continue;
+                }
+
                 BUG_ON(!page->page);
                 bio = bio_alloc(GFP_NOFS, 1);
+                if (!bio)
+                        return -EIO;
                 bio->bi_bdev = page->bdev;
                 bio->bi_sector = page->physical >> 9;
                 bio->bi_end_io = scrub_complete_bio_end_io;
@@ -1171,6 +1180,8 @@ static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
                 DECLARE_COMPLETION_ONSTACK(complete);
 
                 bio = bio_alloc(GFP_NOFS, 1);
+                if (!bio)
+                        return -EIO;
                 bio->bi_bdev = page_bad->bdev;
                 bio->bi_sector = page_bad->physical >> 9;
                 bio->bi_end_io = scrub_complete_bio_end_io;
@@ -1253,12 +1264,6 @@ static int scrub_checksum_data(struct scrub_block *sblock)
         if (memcmp(csum, on_disk_csum, sdev->csum_size))
                 fail = 1;
 
-        if (fail) {
-                spin_lock(&sdev->stat_lock);
-                ++sdev->stat.csum_errors;
-                spin_unlock(&sdev->stat_lock);
-        }
-
         return fail;
 }
 
@@ -1331,15 +1336,6 @@ static int scrub_checksum_tree_block(struct scrub_block *sblock)
         if (memcmp(calculated_csum, on_disk_csum, sdev->csum_size))
                 ++crc_fail;
 
-        if (crc_fail || fail) {
-                spin_lock(&sdev->stat_lock);
-                if (crc_fail)
-                        ++sdev->stat.csum_errors;
-                if (fail)
-                        ++sdev->stat.verify_errors;
-                spin_unlock(&sdev->stat_lock);
-        }
-
         return fail || crc_fail;
 }