dm kcopyd: remove nr_pages field from job structure

The nr_pages field in struct kcopyd_job is only used temporarily in
run_pages_job() to count the number of required pages.
We can use a local variable instead.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index e7926fa1eef2dd646e11480893b49a9a39f259ce..98725e11932453fff0859b0cc7777a1fb61c67ca 100644 (file)
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -224,7 +224,6 @@ struct kcopyd_job {
        unsigned int num_dests;
        struct dm_io_region dests[DM_KCOPYD_MAX_REGIONS];
 
-       unsigned int nr_pages;
        struct page_list *pages;
 
        /*
@@ -396,9 +395,9 @@ 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);
 
-       job->nr_pages = dm_div_up(job->dests[0].count, PAGE_SIZE >> 9);
-       r = kcopyd_get_pages(job->kc, job->nr_pages, &job->pages);
+       r = kcopyd_get_pages(job->kc, nr_pages, &job->pages);
        if (!r) {
                /* this job is ready for io */
                push(&job->kc->io_jobs, job);
@@ -600,7 +599,6 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
        job->num_dests = num_dests;
        memcpy(&job->dests, dests, sizeof(*dests) * num_dests);
 
-       job->nr_pages = 0;
        job->pages = NULL;
 
        job->fn = fn;