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-rw-r--r--drivers/md/dm-crypt.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 8c0e36b1d0ed..4519a7c0098c 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -110,7 +110,8 @@ struct iv_tcw_private {
* Crypt: maps a linear range of a block device
* and encrypts / decrypts at the same time.
*/
-enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, DM_CRYPT_SAME_CPU };
+enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID,
+ DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD };
/*
* The fields in here must be read only after initialization.
@@ -1239,6 +1240,11 @@ static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
clone->bi_iter.bi_sector = cc->start + io->sector;
+ if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) {
+ generic_make_request(clone);
+ return;
+ }
+
spin_lock_irqsave(&cc->write_thread_wait.lock, flags);
list_add_tail(&io->list, &cc->write_thread_list);
wake_up_locked(&cc->write_thread_wait);
@@ -1693,7 +1699,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
char dummy;
static struct dm_arg _args[] = {
- {0, 2, "Invalid number of feature args"},
+ {0, 3, "Invalid number of feature args"},
};
if (argc < 5) {
@@ -1802,6 +1808,9 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
else if (!strcasecmp(opt_string, "same_cpu_crypt"))
set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
+ else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
+ set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
+
else {
ti->error = "Invalid feature arguments";
goto bad;
@@ -1905,12 +1914,15 @@ static void crypt_status(struct dm_target *ti, status_type_t type,
num_feature_args += !!ti->num_discard_bios;
num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
+ num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
if (num_feature_args) {
DMEMIT(" %d", num_feature_args);
if (ti->num_discard_bios)
DMEMIT(" allow_discards");
if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
DMEMIT(" same_cpu_crypt");
+ if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
+ DMEMIT(" submit_from_crypt_cpus");
}
break;