btrfs: Kill some bi_idx references

For immutable bio vecs, I've been auditing and removing bi_idx
references. These were harmless, but removing them will make auditing
easier.

scrub_bio_end_io_worker() was open coding a bio_reset() - but this
doesn't appear to have been needed for anything as right after it does a
bio_put(), and perusing the code it doesn't appear anything else was
holding a reference to the bio.

The other use end_bio_extent_readpage() was just for a pr_debug() -
changed it to something that might be a bit more useful.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Chris Mason <chris.mason@oracle.com>
CC: Stefan Behrens <sbehrens@giantdisaster.de>

2 files changed, 2 insertions, 17 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 3ad84f500687..90bd9f768c0a 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2306,8 +2306,8 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
                 struct extent_state *cached = NULL;
                 struct extent_state *state;
 
-                pr_debug("end_bio_extent_readpage: bi_vcnt=%d, idx=%d, err=%d, "
-                         "mirror=%ld\n", bio->bi_vcnt, bio->bi_idx, err,
+                pr_debug("end_bio_extent_readpage: bi_sector=%llu, err=%d, "
+                         "mirror=%ld\n", (u64)bio->bi_sector, err,
                          (long int)bio->bi_bdev);
                 tree = &BTRFS_I(page->mapping->host)->io_tree;
 
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index d3bb901ade42..27892f67e69b 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1669,21 +1669,6 @@ static void scrub_bio_end_io_worker(struct btrfs_work *work)
                 scrub_block_put(sblock);
         }
 
-        if (sbio->err) {
-                /* what is this good for??? */
-                sbio->bio->bi_flags &= ~(BIO_POOL_MASK - 1);
-                sbio->bio->bi_flags |= 1 << BIO_UPTODATE;
-                sbio->bio->bi_phys_segments = 0;
-                sbio->bio->bi_idx = 0;
-
-                for (i = 0; i < sbio->page_count; i++) {
-                        struct bio_vec *bi;
-                        bi = &sbio->bio->bi_io_vec[i];
-                        bi->bv_offset = 0;
-                        bi->bv_len = PAGE_SIZE;
-                }
-        }
-
         bio_put(sbio->bio);
         sbio->bio = NULL;
         spin_lock(&sdev->list_lock);