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dm: introduce a new DM_MAPIO_KILL return value 

This untangles the DM_MAPIO_* values returned from ->clone_and_map_rq
from the error codes used by the block layer.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Christoph Hellwig 2017-04-26 09:40:39 +02:00 committed by Mike Snitzer
parent 7ed8578a96
commit 412445acb6
3 changed files with 7 additions and 8 deletions
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12
drivers/md/dm-rq.c
View File

@ -504,14 +504,12 @@ static int map_request(struct dm_rq_target_io *tio)
/* The target wants to requeue the I/O after a delay */
dm_requeue_original_request(tio, true);
break;
default:
if (r > 0) {
DMWARN("unimplemented target map return value: %d", r);
BUG();
}
case DM_MAPIO_KILL:
/* The target wants to complete the I/O */
dm_kill_unmapped_request(rq, r);
dm_kill_unmapped_request(rq, -EIO);
default:
DMWARN("unimplemented target map return value: %d", r);
BUG();
}
return r;

2
drivers/md/dm-target.c
View File

@ -135,7 +135,7 @@ static int io_err_clone_and_map_rq(struct dm_target *ti, struct request *rq,
union map_info *map_context,
struct request **clone)
{
return -EIO;
return DM_MAPIO_KILL;
}
static void io_err_release_clone_rq(struct request *clone)

1
include/linux/device-mapper.h
View File

@ -604,6 +604,7 @@ extern struct ratelimit_state dm_ratelimit_state;
#define DM_MAPIO_REMAPPED 1
#define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE
#define DM_MAPIO_DELAY_REQUEUE 3
#define DM_MAPIO_KILL 4
#define dm_sector_div64(x, y)( \
{ \