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dm: add support for secure erase forwarding

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Set QUEUE_FLAG_SECERASE in DM device's queue_flags if a DM table's
data devices support secure erase.

Also, add support for secure erase to both the linear and striped
targets.

Signed-off-by: Denis Semakin <d.semakin@omprussia.ru>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Denis Semakin 2018-03-13 13:23:45 +04:00 committed by Mike Snitzer
parent 0519c71e8d
commit 00716545c8
5 changed files with 52 additions and 0 deletions
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1
drivers/md/dm-linear.c
View File

@ -59,6 +59,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
ti->num_flush_bios = 1;
ti->num_discard_bios = 1;
ti->num_secure_erase_bios = 1;
ti->num_write_same_bios = 1;
ti->num_write_zeroes_bios = 1;
ti->private = lc;

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

@ -169,6 +169,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
ti->num_flush_bios = stripes;
ti->num_discard_bios = stripes;
ti->num_secure_erase_bios = stripes;
ti->num_write_same_bios = stripes;
ti->num_write_zeroes_bios = stripes;
@ -295,6 +296,7 @@ static int stripe_map(struct dm_target *ti, struct bio *bio)
return DM_MAPIO_REMAPPED;
}
if (unlikely(bio_op(bio) == REQ_OP_DISCARD) ||
unlikely(bio_op(bio) == REQ_OP_SECURE_ERASE) ||
unlikely(bio_op(bio) == REQ_OP_WRITE_ZEROES) ||
unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) {
target_bio_nr = dm_bio_get_target_bio_nr(bio);

31
drivers/md/dm-table.c
View File

@ -1846,6 +1846,34 @@ static bool dm_table_supports_discards(struct dm_table *t)
return true;
}
static int device_not_secure_erase_capable(struct dm_target *ti,
struct dm_dev *dev, sector_t start,
sector_t len, void *data)
{
struct request_queue *q = bdev_get_queue(dev->bdev);
return q && !blk_queue_secure_erase(q);
}
static bool dm_table_supports_secure_erase(struct dm_table *t)
{
struct dm_target *ti;
unsigned int i;
for (i = 0; i < dm_table_get_num_targets(t); i++) {
ti = dm_table_get_target(t, i);
if (!ti->num_secure_erase_bios)
return false;
if (!ti->type->iterate_devices ||
ti->type->iterate_devices(ti, device_not_secure_erase_capable, NULL))
return false;
}
return true;
}
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
struct queue_limits *limits)
{
@ -1867,6 +1895,9 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
} else
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
if (dm_table_supports_secure_erase(t))
queue_flag_set_unlocked(QUEUE_FLAG_SECERASE, q);
if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_WC))) {
wc = true;
if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_FUA)))

12
drivers/md/dm.c
View File

@ -1414,6 +1414,11 @@ static unsigned get_num_discard_bios(struct dm_target *ti)
return ti->num_discard_bios;
}
static unsigned get_num_secure_erase_bios(struct dm_target *ti)
{
return ti->num_secure_erase_bios;
}
static unsigned get_num_write_same_bios(struct dm_target *ti)
{
return ti->num_write_same_bios;
@ -1467,6 +1472,11 @@ static int __send_discard(struct clone_info *ci, struct dm_target *ti)
is_split_required_for_discard);
}
static int __send_secure_erase(struct clone_info *ci, struct dm_target *ti)
{
return __send_changing_extent_only(ci, ti, get_num_secure_erase_bios, NULL);
}
static int __send_write_same(struct clone_info *ci, struct dm_target *ti)
{
return __send_changing_extent_only(ci, ti, get_num_write_same_bios, NULL);
@ -1484,6 +1494,8 @@ static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti,
if (bio_op(bio) == REQ_OP_DISCARD)
*result = __send_discard(ci, ti);
else if (bio_op(bio) == REQ_OP_SECURE_ERASE)
*result = __send_secure_erase(ci, ti);
else if (bio_op(bio) == REQ_OP_WRITE_SAME)
*result = __send_write_same(ci, ti);
else if (bio_op(bio) == REQ_OP_WRITE_ZEROES)

6
include/linux/device-mapper.h
View File

@ -267,6 +267,12 @@ struct dm_target {
*/
unsigned num_discard_bios;
/*
* The number of secure erase bios that will be submitted to the target.
* The bio number can be accessed with dm_bio_get_target_bio_nr.
*/
unsigned num_secure_erase_bios;
/*
* The number of WRITE SAME bios that will be submitted to the target.
* The bio number can be accessed with dm_bio_get_target_bio_nr.