On Mon, Nov 04 2013 at 9:51pm -0500,
Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
> Hi all,
>
> After merging the device-mapper tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
>
> drivers/md/dm-cache-target.c: In function 'bio_writes_complete_block':
> drivers/md/dm-cache-target.c:1020:7: error: 'struct bio' has no member named 'bi_size'
> (bio->bi_size == (cache->sectors_per_block << SECTOR_SHIFT));
> ^
>
> Caused by commit 1bd270d800ec ("dm cache: promotion optimisation for
> writes") interacting with commit ed2d2f9a8265 ("block: Abstract out bvec
> iterator") from the block tree.
>
> I applied this fix up patch and can carry it as necessary:
Hi Stephen,
Yes that is needed, as is this (which begs the question: how should I be
handling the fact that post-merge changes are needed? Especially since
Linus will need the changes too):
drivers/md/dm-cache-target.c | 12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index a977d5c..52d7d75 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -85,6 +85,12 @@ static void dm_unhook_bio(struct dm_hook_info *h, struct bio *bio)
{
bio->bi_end_io = h->bi_end_io;
bio->bi_private = h->bi_private;
+
+ /*
+ * Must bump bi_remaining to allow bio to complete with
+ * restored bi_end_io.
+ */
+ atomic_inc(&bio->bi_remaining);
}
/*----------------------------------------------------------------*/
@@ -746,12 +752,6 @@ static void writethrough_endio(struct bio *bio, int err)
dm_unhook_bio(&pb->hook_info, bio);
- /*
- * Must bump bi_remaining to allow bio to complete with
- * restored bi_end_io.
- */
- atomic_inc(&bio->bi_remaining);
-
if (err) {
bio_endio(bio, err);
return;
--
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