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-rw-r--r--drivers/md/dm-io.c23
-rw-r--r--drivers/md/dm-kcopyd.c18
-rw-r--r--drivers/md/dm-thin.c2
3 files changed, 33 insertions, 10 deletions
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 1c46f97..ea49834 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -287,7 +287,8 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
unsigned num_bvecs;
sector_t remaining = where->count;
struct request_queue *q = bdev_get_queue(where->bdev);
- sector_t discard_sectors;
+ unsigned short logical_block_size = queue_logical_block_size(q);
+ sector_t num_sectors;
/*
* where->count may be zero if rw holds a flush and we need to
@@ -297,7 +298,7 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
/*
* Allocate a suitably sized-bio.
*/
- if (rw & REQ_DISCARD)
+ if ((rw & REQ_DISCARD) || (rw & REQ_WRITE_SAME))
num_bvecs = 1;
else
num_bvecs = min_t(int, bio_get_nr_vecs(where->bdev),
@@ -310,9 +311,21 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
store_io_and_region_in_bio(bio, io, region);
if (rw & REQ_DISCARD) {
- discard_sectors = min_t(sector_t, q->limits.max_discard_sectors, remaining);
- bio->bi_size = discard_sectors << SECTOR_SHIFT;
- remaining -= discard_sectors;
+ num_sectors = min_t(sector_t, q->limits.max_discard_sectors, remaining);
+ bio->bi_size = num_sectors << SECTOR_SHIFT;
+ remaining -= num_sectors;
+ } else if (rw & REQ_WRITE_SAME) {
+ /*
+ * WRITE SAME only uses a single page.
+ */
+ dp->get_page(dp, &page, &len, &offset);
+ bio_add_page(bio, page, logical_block_size, offset);
+ num_sectors = min_t(sector_t, q->limits.max_write_same_sectors, remaining);
+ bio->bi_size = num_sectors << SECTOR_SHIFT;
+
+ offset = 0;
+ remaining -= num_sectors;
+ dp->next_page(dp);
} else while (remaining) {
/*
* Try and add as many pages as possible.
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index bed444c..68c0267 100644
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -349,7 +349,7 @@ static void complete_io(unsigned long error, void *context)
struct dm_kcopyd_client *kc = job->kc;
if (error) {
- if (job->rw == WRITE)
+ if (job->rw & WRITE)
job->write_err |= error;
else
job->read_err = 1;
@@ -361,7 +361,7 @@ static void complete_io(unsigned long error, void *context)
}
}
- if (job->rw == WRITE)
+ if (job->rw & WRITE)
push(&kc->complete_jobs, job);
else {
@@ -432,7 +432,7 @@ static int process_jobs(struct list_head *jobs, struct dm_kcopyd_client *kc,
if (r < 0) {
/* error this rogue job */
- if (job->rw == WRITE)
+ if (job->rw & WRITE)
job->write_err = (unsigned long) -1L;
else
job->read_err = 1;
@@ -585,6 +585,7 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
unsigned int flags, dm_kcopyd_notify_fn fn, void *context)
{
struct kcopyd_job *job;
+ int i;
/*
* Allocate an array of jobs consisting of one master job
@@ -611,7 +612,16 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
memset(&job->source, 0, sizeof job->source);
job->source.count = job->dests[0].count;
job->pages = &zero_page_list;
- job->rw = WRITE;
+
+ /*
+ * Use WRITE SAME to optimize zeroing if all dests support it.
+ */
+ job->rw = WRITE | REQ_WRITE_SAME;
+ for (i = 0; i < job->num_dests; i++)
+ if (!bdev_write_same(job->dests[i].bdev)) {
+ job->rw = WRITE;
+ break;
+ }
}
job->fn = fn;
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index fba378f..4b94074 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2779,7 +2779,7 @@ static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits)
static struct target_type thin_target = {
.name = "thin",
- .version = {1, 5, 0},
+ .version = {1, 6, 0},
.module = THIS_MODULE,
.ctr = thin_ctr,
.dtr = thin_dtr,
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