block: add a bi_error field to struct bio

Currently we have two different ways to signal an I/O error on a BIO:

 (1) by clearing the BIO_UPTODATE flag
 (2) by returning a Linux errno value to the bi_end_io callback

The first one has the drawback of only communicating a single possible
error (-EIO), and the second one has the drawback of not beeing persistent
when bios are queued up, and are not passed along from child to parent
bio in the ever more popular chaining scenario.  Having both mechanisms
available has the additional drawback of utterly confusing driver authors
and introducing bugs where various I/O submitters only deal with one of
them, and the others have to add boilerplate code to deal with both kinds
of error returns.

So add a new bi_error field to store an errno value directly in struct
bio and remove the existing mechanisms to clean all this up.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index e573e470bd8a..f9ab74505e69 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -331,14 +331,12 @@ static void brd_make_request(struct request_queue *q, struct bio *bio)
         struct bio_vec bvec;
         sector_t sector;
         struct bvec_iter iter;
-        int err = -EIO;
 
         sector = bio->bi_iter.bi_sector;
         if (bio_end_sector(bio) > get_capacity(bdev->bd_disk))
-                goto out;
+                goto io_error;
 
         if (unlikely(bio->bi_rw & REQ_DISCARD)) {
-                err = 0;
                 discard_from_brd(brd, sector, bio->bi_iter.bi_size);
                 goto out;
         }
@@ -349,15 +347,20 @@ static void brd_make_request(struct request_queue *q, struct bio *bio)
 
         bio_for_each_segment(bvec, bio, iter) {
                 unsigned int len = bvec.bv_len;
+                int err;
+
                 err = brd_do_bvec(brd, bvec.bv_page, len,
                                         bvec.bv_offset, rw, sector);
                 if (err)
-                        break;
+                        goto io_error;
                 sector += len >> SECTOR_SHIFT;
         }
 
 out:
-        bio_endio(bio, err);
+        bio_endio(bio);
+        return;
+io_error:
+        bio_io_error(bio);
 }
 
 static int brd_rw_page(struct block_device *bdev, sector_t sector,