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path: root/drivers/md/dm-kcopyd.c
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Diffstat (limited to 'drivers/md/dm-kcopyd.c')
-rw-r--r--drivers/md/dm-kcopyd.c61
1 files changed, 35 insertions, 26 deletions
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index 4d3bbbea2e9a..a158c6e5fbd7 100644
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2002 Sistina Software (UK) Limited.
* Copyright (C) 2006 Red Hat GmbH
@@ -34,14 +35,14 @@
#define DEFAULT_SUB_JOB_SIZE_KB 512
#define MAX_SUB_JOB_SIZE_KB 1024
-static unsigned kcopyd_subjob_size_kb = DEFAULT_SUB_JOB_SIZE_KB;
+static unsigned int kcopyd_subjob_size_kb = DEFAULT_SUB_JOB_SIZE_KB;
-module_param(kcopyd_subjob_size_kb, uint, S_IRUGO | S_IWUSR);
+module_param(kcopyd_subjob_size_kb, uint, 0644);
MODULE_PARM_DESC(kcopyd_subjob_size_kb, "Sub-job size for dm-kcopyd clients");
-static unsigned dm_get_kcopyd_subjob_size(void)
+static unsigned int dm_get_kcopyd_subjob_size(void)
{
- unsigned sub_job_size_kb;
+ unsigned int sub_job_size_kb;
sub_job_size_kb = __dm_get_module_param(&kcopyd_subjob_size_kb,
DEFAULT_SUB_JOB_SIZE_KB,
@@ -50,15 +51,17 @@ static unsigned dm_get_kcopyd_subjob_size(void)
return sub_job_size_kb << 1;
}
-/*-----------------------------------------------------------------
+/*
+ *----------------------------------------------------------------
* Each kcopyd client has its own little pool of preallocated
* pages for kcopyd io.
- *---------------------------------------------------------------*/
+ *---------------------------------------------------------------
+ */
struct dm_kcopyd_client {
struct page_list *pages;
- unsigned nr_reserved_pages;
- unsigned nr_free_pages;
- unsigned sub_job_size;
+ unsigned int nr_reserved_pages;
+ unsigned int nr_free_pages;
+ unsigned int sub_job_size;
struct dm_io_client *io_client;
@@ -109,7 +112,7 @@ static DEFINE_SPINLOCK(throttle_spinlock);
* The reason for this is unknown but possibly due to jiffies rounding errors
* or read/write cache inside the disk.
*/
-#define SLEEP_MSEC 100
+#define SLEEP_USEC 100000
/*
* Maximum number of sleep events. There is a theoretical livelock if more
@@ -119,7 +122,7 @@ static DEFINE_SPINLOCK(throttle_spinlock);
static void io_job_start(struct dm_kcopyd_throttle *t)
{
- unsigned throttle, now, difference;
+ unsigned int throttle, now, difference;
int slept = 0, skew;
if (unlikely(!t))
@@ -148,6 +151,7 @@ try_again:
if (unlikely(t->total_period >= (1 << ACCOUNT_INTERVAL_SHIFT))) {
int shift = fls(t->total_period >> ACCOUNT_INTERVAL_SHIFT);
+
t->total_period >>= shift;
t->io_period >>= shift;
}
@@ -157,7 +161,7 @@ try_again:
if (unlikely(skew > 0) && slept < MAX_SLEEPS) {
slept++;
spin_unlock_irq(&throttle_spinlock);
- msleep(SLEEP_MSEC);
+ fsleep(SLEEP_USEC);
goto try_again;
}
@@ -182,7 +186,7 @@ static void io_job_finish(struct dm_kcopyd_throttle *t)
goto skip_limit;
if (!t->num_io_jobs) {
- unsigned now, difference;
+ unsigned int now, difference;
now = jiffies;
difference = now - t->last_jiffies;
@@ -303,9 +307,9 @@ static void drop_pages(struct page_list *pl)
/*
* Allocate and reserve nr_pages for the use of a specific client.
*/
-static int client_reserve_pages(struct dm_kcopyd_client *kc, unsigned nr_pages)
+static int client_reserve_pages(struct dm_kcopyd_client *kc, unsigned int nr_pages)
{
- unsigned i;
+ unsigned int i;
struct page_list *pl = NULL, *next;
for (i = 0; i < nr_pages; i++) {
@@ -333,15 +337,17 @@ static void client_free_pages(struct dm_kcopyd_client *kc)
kc->nr_free_pages = kc->nr_reserved_pages = 0;
}
-/*-----------------------------------------------------------------
+/*
+ *---------------------------------------------------------------
* kcopyd_jobs need to be allocated by the *clients* of kcopyd,
* for this reason we use a mempool to prevent the client from
* ever having to do io (which could cause a deadlock).
- *---------------------------------------------------------------*/
+ *---------------------------------------------------------------
+ */
struct kcopyd_job {
struct dm_kcopyd_client *kc;
struct list_head list;
- unsigned flags;
+ unsigned int flags;
/*
* Error state of the job.
@@ -582,7 +588,7 @@ static int run_io_job(struct kcopyd_job *job)
static int run_pages_job(struct kcopyd_job *job)
{
int r;
- unsigned nr_pages = dm_div_up(job->dests[0].count, PAGE_SIZE >> 9);
+ unsigned int nr_pages = dm_div_up(job->dests[0].count, PAGE_SIZE >> 9);
r = kcopyd_get_pages(job->kc, nr_pages, &job->pages);
if (!r) {
@@ -603,7 +609,7 @@ static int run_pages_job(struct kcopyd_job *job)
* of successful jobs.
*/
static int process_jobs(struct list_head *jobs, struct dm_kcopyd_client *kc,
- int (*fn) (struct kcopyd_job *))
+ int (*fn)(struct kcopyd_job *))
{
struct kcopyd_job *job;
int r, count = 0;
@@ -673,6 +679,7 @@ static void do_work(struct work_struct *work)
static void dispatch_job(struct kcopyd_job *job)
{
struct dm_kcopyd_client *kc = job->kc;
+
atomic_inc(&kc->nr_jobs);
if (unlikely(!job->source.count))
push(&kc->callback_jobs, job);
@@ -819,7 +826,7 @@ void dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
job->pages = NULL;
job->op = REQ_OP_READ;
} else {
- memset(&job->source, 0, sizeof job->source);
+ memset(&job->source, 0, sizeof(job->source));
job->source.count = job->dests[0].count;
job->pages = &zero_page_list;
@@ -849,8 +856,8 @@ void dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
EXPORT_SYMBOL(dm_kcopyd_copy);
void dm_kcopyd_zero(struct dm_kcopyd_client *kc,
- unsigned num_dests, struct dm_io_region *dests,
- unsigned flags, dm_kcopyd_notify_fn fn, void *context)
+ unsigned int num_dests, struct dm_io_region *dests,
+ unsigned int flags, dm_kcopyd_notify_fn fn, void *context)
{
dm_kcopyd_copy(kc, NULL, num_dests, dests, flags, fn, context);
}
@@ -900,13 +907,15 @@ int kcopyd_cancel(struct kcopyd_job *job, int block)
}
#endif /* 0 */
-/*-----------------------------------------------------------------
+/*
+ *---------------------------------------------------------------
* Client setup
- *---------------------------------------------------------------*/
+ *---------------------------------------------------------------
+ */
struct dm_kcopyd_client *dm_kcopyd_client_create(struct dm_kcopyd_throttle *throttle)
{
int r;
- unsigned reserve_pages;
+ unsigned int reserve_pages;
struct dm_kcopyd_client *kc;
kc = kzalloc(sizeof(*kc), GFP_KERNEL);
generated by cgit v1.2.3 (git 2.39.0) at 2024-07-26 08:20:18 +0300