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dm: allow targets to require splitting WRITE_ZEROES and SECURE_ERASE

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Introduce max_write_zeroes_granularity and
max_secure_erase_granularity flags in the dm_target struct.

If a target sets these then DM core will split IO of these operation
types accordingly (in terms of max_write_zeroes_sectors and
max_secure_erase_sectors respectively).

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mike Snitzer 2023-04-14 12:07:27 -04:00
parent 3664ff82da
commit 13f6facf3f
2 changed files with 20 additions and 6 deletions
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10
drivers/md/dm.c
View file

@ -1614,21 +1614,23 @@ static blk_status_t __process_abnormal_io(struct clone_info *ci,
{
unsigned int num_bios = 0;
unsigned int max_granularity = 0;
struct queue_limits *limits = dm_get_queue_limits(ti->table->md);
switch (bio_op(ci->bio)) {
case REQ_OP_DISCARD:
num_bios = ti->num_discard_bios;
if (ti->max_discard_granularity) {
struct queue_limits *limits =
dm_get_queue_limits(ti->table->md);
if (ti->max_discard_granularity)
max_granularity = limits->max_discard_sectors;
}
break;
case REQ_OP_SECURE_ERASE:
num_bios = ti->num_secure_erase_bios;
if (ti->max_secure_erase_granularity)
max_granularity = limits->max_secure_erase_sectors;
break;
case REQ_OP_WRITE_ZEROES:
num_bios = ti->num_write_zeroes_bios;
if (ti->max_write_zeroes_granularity)
max_granularity = limits->max_write_zeroes_sectors;
break;
default:
break;

16
include/linux/device-mapper.h
View file

@ -359,11 +359,23 @@ struct dm_target {
bool discards_supported:1;
/*
* Set if this target requires that discards be split on both
* 'discard_granularity' and 'max_discard_sectors' boundaries.
* Set if this target requires that discards be split on
* 'max_discard_sectors' boundaries.
*/
bool max_discard_granularity:1;
/*
* Set if this target requires that secure_erases be split on
* 'max_secure_erase_sectors' boundaries.
*/
bool max_secure_erase_granularity:1;
/*
* Set if this target requires that write_zeroes be split on
* 'max_write_zeroes_sectors' boundaries.
*/
bool max_write_zeroes_granularity:1;
/*
* Set if we need to limit the number of in-flight bios when swapping.
*/