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path: root/drivers/md/dm-delay.c
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Diffstat (limited to 'drivers/md/dm-delay.c')
-rw-r--r--drivers/md/dm-delay.c83
1 files changed, 30 insertions, 53 deletions
diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index baa11912cc9..42c3a27a14c 100644
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -20,10 +20,10 @@
struct delay_c {
struct timer_list delay_timer;
struct mutex timer_lock;
+ struct workqueue_struct *kdelayd_wq;
struct work_struct flush_expired_bios;
struct list_head delayed_bios;
atomic_t may_delay;
- mempool_t *delayed_pool;
struct dm_dev *dev_read;
sector_t start_read;
@@ -39,20 +39,16 @@ struct delay_c {
struct dm_delay_info {
struct delay_c *context;
struct list_head list;
- struct bio *bio;
unsigned long expires;
};
static DEFINE_MUTEX(delayed_bios_lock);
-static struct workqueue_struct *kdelayd_wq;
-static struct kmem_cache *delayed_cache;
-
static void handle_delayed_timer(unsigned long data)
{
struct delay_c *dc = (struct delay_c *)data;
- queue_work(kdelayd_wq, &dc->flush_expired_bios);
+ queue_work(dc->kdelayd_wq, &dc->flush_expired_bios);
}
static void queue_timeout(struct delay_c *dc, unsigned long expires)
@@ -87,13 +83,14 @@ static struct bio *flush_delayed_bios(struct delay_c *dc, int flush_all)
mutex_lock(&delayed_bios_lock);
list_for_each_entry_safe(delayed, next, &dc->delayed_bios, list) {
if (flush_all || time_after_eq(jiffies, delayed->expires)) {
+ struct bio *bio = dm_bio_from_per_bio_data(delayed,
+ sizeof(struct dm_delay_info));
list_del(&delayed->list);
- bio_list_add(&flush_bios, delayed->bio);
- if ((bio_data_dir(delayed->bio) == WRITE))
+ bio_list_add(&flush_bios, bio);
+ if ((bio_data_dir(bio) == WRITE))
delayed->context->writes--;
else
delayed->context->reads--;
- mempool_free(delayed, dc->delayed_pool);
continue;
}
@@ -131,6 +128,7 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct delay_c *dc;
unsigned long long tmpll;
+ char dummy;
if (argc != 3 && argc != 6) {
ti->error = "requires exactly 3 or 6 arguments";
@@ -145,13 +143,13 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
dc->reads = dc->writes = 0;
- if (sscanf(argv[1], "%llu", &tmpll) != 1) {
+ if (sscanf(argv[1], "%llu%c", &tmpll, &dummy) != 1) {
ti->error = "Invalid device sector";
goto bad;
}
dc->start_read = tmpll;
- if (sscanf(argv[2], "%u", &dc->read_delay) != 1) {
+ if (sscanf(argv[2], "%u%c", &dc->read_delay, &dummy) != 1) {
ti->error = "Invalid delay";
goto bad;
}
@@ -166,13 +164,13 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
if (argc == 3)
goto out;
- if (sscanf(argv[4], "%llu", &tmpll) != 1) {
+ if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
ti->error = "Invalid write device sector";
goto bad_dev_read;
}
dc->start_write = tmpll;
- if (sscanf(argv[5], "%u", &dc->write_delay) != 1) {
+ if (sscanf(argv[5], "%u%c", &dc->write_delay, &dummy) != 1) {
ti->error = "Invalid write delay";
goto bad_dev_read;
}
@@ -184,10 +182,10 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
out:
- dc->delayed_pool = mempool_create_slab_pool(128, delayed_cache);
- if (!dc->delayed_pool) {
- DMERR("Couldn't create delayed bio pool.");
- goto bad_dev_write;
+ dc->kdelayd_wq = alloc_workqueue("kdelayd", WQ_MEM_RECLAIM, 0);
+ if (!dc->kdelayd_wq) {
+ DMERR("Couldn't start kdelayd");
+ goto bad_queue;
}
setup_timer(&dc->delay_timer, handle_delayed_timer, (unsigned long)dc);
@@ -197,12 +195,13 @@ out:
mutex_init(&dc->timer_lock);
atomic_set(&dc->may_delay, 1);
- ti->num_flush_requests = 1;
- ti->num_discard_requests = 1;
+ ti->num_flush_bios = 1;
+ ti->num_discard_bios = 1;
+ ti->per_bio_data_size = sizeof(struct dm_delay_info);
ti->private = dc;
return 0;
-bad_dev_write:
+bad_queue:
if (dc->dev_write)
dm_put_device(ti, dc->dev_write);
bad_dev_read:
@@ -216,14 +215,13 @@ static void delay_dtr(struct dm_target *ti)
{
struct delay_c *dc = ti->private;
- flush_workqueue(kdelayd_wq);
+ destroy_workqueue(dc->kdelayd_wq);
dm_put_device(ti, dc->dev_read);
if (dc->dev_write)
dm_put_device(ti, dc->dev_write);
- mempool_destroy(dc->delayed_pool);
kfree(dc);
}
@@ -235,10 +233,9 @@ static int delay_bio(struct delay_c *dc, int delay, struct bio *bio)
if (!delay || !atomic_read(&dc->may_delay))
return 1;
- delayed = mempool_alloc(dc->delayed_pool, GFP_NOIO);
+ delayed = dm_per_bio_data(bio, sizeof(struct dm_delay_info));
delayed->context = dc;
- delayed->bio = bio;
delayed->expires = expires = jiffies + (delay * HZ / 1000);
mutex_lock(&delayed_bios_lock);
@@ -273,28 +270,28 @@ static void delay_resume(struct dm_target *ti)
atomic_set(&dc->may_delay, 1);
}
-static int delay_map(struct dm_target *ti, struct bio *bio,
- union map_info *map_context)
+static int delay_map(struct dm_target *ti, struct bio *bio)
{
struct delay_c *dc = ti->private;
if ((bio_data_dir(bio) == WRITE) && (dc->dev_write)) {
bio->bi_bdev = dc->dev_write->bdev;
if (bio_sectors(bio))
- bio->bi_sector = dc->start_write +
- dm_target_offset(ti, bio->bi_sector);
+ bio->bi_iter.bi_sector = dc->start_write +
+ dm_target_offset(ti, bio->bi_iter.bi_sector);
return delay_bio(dc, dc->write_delay, bio);
}
bio->bi_bdev = dc->dev_read->bdev;
- bio->bi_sector = dc->start_read + dm_target_offset(ti, bio->bi_sector);
+ bio->bi_iter.bi_sector = dc->start_read +
+ dm_target_offset(ti, bio->bi_iter.bi_sector);
return delay_bio(dc, dc->read_delay, bio);
}
-static int delay_status(struct dm_target *ti, status_type_t type,
- char *result, unsigned maxlen)
+static void delay_status(struct dm_target *ti, status_type_t type,
+ unsigned status_flags, char *result, unsigned maxlen)
{
struct delay_c *dc = ti->private;
int sz = 0;
@@ -314,8 +311,6 @@ static int delay_status(struct dm_target *ti, status_type_t type,
dc->write_delay);
break;
}
-
- return 0;
}
static int delay_iterate_devices(struct dm_target *ti,
@@ -337,7 +332,7 @@ out:
static struct target_type delay_target = {
.name = "delay",
- .version = {1, 1, 0},
+ .version = {1, 2, 1},
.module = THIS_MODULE,
.ctr = delay_ctr,
.dtr = delay_dtr,
@@ -350,19 +345,7 @@ static struct target_type delay_target = {
static int __init dm_delay_init(void)
{
- int r = -ENOMEM;
-
- kdelayd_wq = create_workqueue("kdelayd");
- if (!kdelayd_wq) {
- DMERR("Couldn't start kdelayd");
- goto bad_queue;
- }
-
- delayed_cache = KMEM_CACHE(dm_delay_info, 0);
- if (!delayed_cache) {
- DMERR("Couldn't create delayed bio cache.");
- goto bad_memcache;
- }
+ int r;
r = dm_register_target(&delay_target);
if (r < 0) {
@@ -373,18 +356,12 @@ static int __init dm_delay_init(void)
return 0;
bad_register:
- kmem_cache_destroy(delayed_cache);
-bad_memcache:
- destroy_workqueue(kdelayd_wq);
-bad_queue:
return r;
}
static void __exit dm_delay_exit(void)
{
dm_unregister_target(&delay_target);
- kmem_cache_destroy(delayed_cache);
- destroy_workqueue(kdelayd_wq);
}
/* Module hooks */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-05 10:33:43 +0000