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-rw-r--r--drivers/md/dm-zero.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/md/dm-zero.c b/drivers/md/dm-zero.c
index 766bc93..618b875 100644
--- a/drivers/md/dm-zero.c
+++ b/drivers/md/dm-zero.c
@@ -35,16 +35,19 @@ static int zero_ctr(struct dm_target *ti, unsigned int argc, char **argv)
*/
static int zero_map(struct dm_target *ti, struct bio *bio)
{
- switch(bio_rw(bio)) {
- case READ:
+ switch (bio_op(bio)) {
+ case REQ_OP_READ:
+ if (bio->bi_rw & REQ_RAHEAD) {
+ /* readahead of null bytes only wastes buffer cache */
+ return -EIO;
+ }
zero_fill_bio(bio);
break;
- case READA:
- /* readahead of null bytes only wastes buffer cache */
- return -EIO;
- case WRITE:
+ case REQ_OP_WRITE:
/* writes get silently dropped */
break;
+ default:
+ return -EIO;
}
bio_endio(bio);
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