diff options
Diffstat (limited to 'drivers/md/dm-zero.c')
| -rw-r--r-- | drivers/md/dm-zero.c | 31 |
1 files changed, 12 insertions, 19 deletions
diff --git a/drivers/md/dm-zero.c b/drivers/md/dm-zero.c index 2601cd520384..3b13e6eb1aa4 100644 --- a/drivers/md/dm-zero.c +++ b/drivers/md/dm-zero.c @@ -27,6 +27,7 @@ static int zero_ctr(struct dm_target *ti, unsigned int argc, char **argv) * Silently drop discards, avoiding -EOPNOTSUPP. */ ti->num_discard_bios = 1; + ti->discards_supported = true; return 0; } @@ -45,6 +46,7 @@ static int zero_map(struct dm_target *ti, struct bio *bio) zero_fill_bio(bio); break; case REQ_OP_WRITE: + case REQ_OP_DISCARD: /* writes get silently dropped */ break; default: @@ -57,32 +59,23 @@ static int zero_map(struct dm_target *ti, struct bio *bio) return DM_MAPIO_SUBMITTED; } +static void zero_io_hints(struct dm_target *ti, struct queue_limits *limits) +{ + limits->max_discard_sectors = UINT_MAX; + limits->max_hw_discard_sectors = UINT_MAX; + limits->discard_granularity = 512; +} + static struct target_type zero_target = { .name = "zero", - .version = {1, 1, 0}, + .version = {1, 2, 0}, .features = DM_TARGET_NOWAIT, .module = THIS_MODULE, .ctr = zero_ctr, .map = zero_map, + .io_hints = zero_io_hints, }; - -static int __init dm_zero_init(void) -{ - int r = dm_register_target(&zero_target); - - if (r < 0) - DMERR("register failed %d", r); - - return r; -} - -static void __exit dm_zero_exit(void) -{ - dm_unregister_target(&zero_target); -} - -module_init(dm_zero_init) -module_exit(dm_zero_exit) +module_dm(zero); MODULE_AUTHOR("Jana Saout <jana@saout.de>"); MODULE_DESCRIPTION(DM_NAME " dummy target returning zeros"); |