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dm verity: conditionally enable branching for "try_verify_in_tasklet"

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Use jump_label to limit the need for branching unless the optional
"try_verify_in_tasklet" feature is used.

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mike Snitzer 2022-07-25 16:52:17 -04:00
parent 3c1c875d05
commit ba2cce82ba
1 changed files with 14 additions and 5 deletions
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19
drivers/md/dm-verity-target.c
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@ -19,6 +19,7 @@
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/scatterlist.h>
#include <linux/jump_label.h>
#define DM_MSG_PREFIX "verity"
@ -43,6 +44,8 @@ static unsigned dm_verity_prefetch_cluster = DM_VERITY_DEFAULT_PREFETCH_SIZE;
module_param_named(prefetch_cluster, dm_verity_prefetch_cluster, uint, S_IRUGO | S_IWUSR);
static DEFINE_STATIC_KEY_FALSE(use_tasklet_enabled);
struct dm_verity_prefetch_work {
struct work_struct work;
struct dm_verity *v;
@ -287,7 +290,7 @@ static int verity_verify_level(struct dm_verity *v, struct dm_verity_io *io,
verity_hash_at_level(v, block, level, &hash_block, &offset);
if (io->in_tasklet) {
if (static_branch_unlikely(&use_tasklet_enabled) && io->in_tasklet) {
data = dm_bufio_get(v->bufio, hash_block, &buf);
if (data == NULL) {
/*
@ -320,7 +323,8 @@ static int verity_verify_level(struct dm_verity *v, struct dm_verity_io *io,
if (likely(memcmp(verity_io_real_digest(v, io), want_digest,
v->digest_size) == 0))
aux->hash_verified = 1;
else if (io->in_tasklet) {
else if (static_branch_unlikely(&use_tasklet_enabled) &&
io->in_tasklet) {
/*
* Error handling code (FEC included) cannot be run in a
* tasklet since it may sleep, so fallback to work-queue.
@ -553,7 +557,8 @@ static int verity_verify_io(struct dm_verity_io *io)
if (v->validated_blocks)
set_bit(cur_block, v->validated_blocks);
continue;
} else if (io->in_tasklet) {
} else if (static_branch_unlikely(&use_tasklet_enabled) &&
io->in_tasklet) {
/*
* Error handling code (FEC included) cannot be run in a
* tasklet since it may sleep, so fallback to work-queue.
@ -598,7 +603,7 @@ static void verity_finish_io(struct dm_verity_io *io, blk_status_t status)
bio->bi_end_io = io->orig_bi_end_io;
bio->bi_status = status;
if (!io->in_tasklet)
if (!static_branch_unlikely(&use_tasklet_enabled) || !io->in_tasklet)
verity_fec_finish_io(io);
bio_endio(bio);
@ -641,7 +646,7 @@ static void verity_end_io(struct bio *bio)
return;
}
if (io->v->use_tasklet) {
if (static_branch_unlikely(&use_tasklet_enabled) && io->v->use_tasklet) {
tasklet_init(&io->tasklet, verity_tasklet, (unsigned long)io);
tasklet_schedule(&io->tasklet);
} else {
@ -949,6 +954,9 @@ static void verity_dtr(struct dm_target *ti)
kfree(v->signature_key_desc);
if (v->use_tasklet)
static_branch_dec(&use_tasklet_enabled);
kfree(v);
}
@ -1080,6 +1088,7 @@ static int verity_parse_opt_args(struct dm_arg_set *as, struct dm_verity *v,
} else if (!strcasecmp(arg_name, DM_VERITY_OPT_TASKLET_VERIFY)) {
v->use_tasklet = true;
static_branch_inc(&use_tasklet_enabled);
continue;
} else if (verity_is_fec_opt_arg(arg_name)) {