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rbd: notrim map option 

Add an option to turn off discard and write zeroes offload support to
avoid deprovisioning a fully provisioned image.  When enabled, discard
requests will fail with -EOPNOTSUPP, write zeroes requests will fall
back to manually zeroing.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Tested-by: Hitoshi Kamei <hitoshi.kamei.xm@hitachi.com>
This commit is contained in:
Ilya Dryomov 2018-03-23 06:14:47 +01:00
parent 420efbdf4d
commit d93605407a
1 changed files with 14 additions and 5 deletions
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19
drivers/block/rbd.c
View File

@ -741,6 +741,7 @@ enum {
Opt_read_write,
Opt_lock_on_read,
Opt_exclusive,
Opt_notrim,
Opt_err
};
@ -755,6 +756,7 @@ static match_table_t rbd_opts_tokens = {
{Opt_read_write, "rw"}, /* Alternate spelling */
{Opt_lock_on_read, "lock_on_read"},
{Opt_exclusive, "exclusive"},
{Opt_notrim, "notrim"},
{Opt_err, NULL}
};
@ -764,6 +766,7 @@ struct rbd_options {
bool read_only;
bool lock_on_read;
bool exclusive;
bool trim;
};
#define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ
@ -771,6 +774,7 @@ struct rbd_options {
#define RBD_READ_ONLY_DEFAULT false
#define RBD_LOCK_ON_READ_DEFAULT false
#define RBD_EXCLUSIVE_DEFAULT false
#define RBD_TRIM_DEFAULT true
static int parse_rbd_opts_token(char *c, void *private)
{
@ -820,6 +824,9 @@ static int parse_rbd_opts_token(char *c, void *private)
case Opt_exclusive:
rbd_opts->exclusive = true;
break;
case Opt_notrim:
rbd_opts->trim = false;
break;
default:
/* libceph prints "bad option" msg */
return -EINVAL;
@ -3976,11 +3983,12 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
blk_queue_io_min(q, objset_bytes);
blk_queue_io_opt(q, objset_bytes);
/* enable the discard support */
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
q->limits.discard_granularity = objset_bytes;
blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT);
blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT);
if (rbd_dev->opts->trim) {
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
q->limits.discard_granularity = objset_bytes;
blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT);
blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT);
}
if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC))
q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES;
@ -5207,6 +5215,7 @@ static int rbd_add_parse_args(const char *buf,
rbd_opts->lock_timeout = RBD_LOCK_TIMEOUT_DEFAULT;
rbd_opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT;
rbd_opts->exclusive = RBD_EXCLUSIVE_DEFAULT;
rbd_opts->trim = RBD_TRIM_DEFAULT;
copts = ceph_parse_options(options, mon_addrs,
mon_addrs + mon_addrs_size - 1,