btrfs: Put mirror_num in bi_bdev

Jan Schmidt · Jan Schmidt · commit 2774b2ca3d49 · 2011-09-29T13:38:42.000+02:00
The error correction code wants to make sure that only the bad mirror is
rewritten. Thus, we need to know which mirror is the bad one. I did not
find a more apropriate field than bi_bdev. But I think using this is fine,
because it is modified by the block layer, anyway, and should not be read
after the bio returned.

Signed-off-by: Jan Schmidt &lt;list.btrfs@jan-o-sch.net&gt;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
@@ -3216,6 +3216,8 @@ static void btrfs_end_bio(struct bio *bio, int err)
 		}
 		bio->bi_private = bbio->private;
 		bio->bi_end_io = bbio->end_io;
+		bio->bi_bdev = (struct block_device *)
+					(unsigned long)bbio->mirror_num;
 		/* only send an error to the higher layers if it is
 		 * beyond the tolerance of the multi-bio
 		 */

Original file line number	Diff line number	Diff line change
`@@ -3216,6 +3216,8 @@ static void btrfs_end_bio(struct bio *bio, int err)`
`3216`	`3216`	`}`
`3217`	`3217`	`bio->bi_private = bbio->private;`
`3218`	`3218`	`bio->bi_end_io = bbio->end_io;`
	`3219`	`+ bio->bi_bdev = (struct block_device *)`
	`3220`	`+ (unsigned long)bbio->mirror_num;`
`3219`	`3221`	`/* only send an error to the higher layers if it is`
`3220`	`3222`	`* beyond the tolerance of the multi-bio`
`3221`	`3223`	`*/`