[PATCH v2 08/11] block: Improve zone reset execution

Damien Le Moal
2018-10-11T07:09:49Z

There is no need to synchronously execute all REQ_OP_ZONE_RESET BIOs
necessary to reset a range of zones. Similarly to what is done for
discard BIOs in blk-lib.c, all zone reset BIOs can be chained and
executed asynchronously and a synchronous call done only for the last
BIO of the chain.

Modify blkdev_reset_zones() to operate similarly to
blkdev_issue_discard() using the next_bio() helper for chaining BIOs. To
avoid code duplication of that function in blk_zoned.c, rename
next_bio() into blk_next_bio() and declare it as a block internal
function in blk.h.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
block/blk-lib.c | 13 ++++++-------
block/blk-zoned.c | 29 ++++++++++++++++-------------
block/blk.h | 2 ++
3 files changed, 24 insertions(+), 20 deletions(-)

diff --git a/block/blk-lib.c b/block/blk-lib.c
index d1b9dd03da25..d7bedee5f9ba 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -10,8 +10,7 @@

#include "blk.h"

-static struct bio *next_bio(struct bio *bio, unsigned int nr_pages,
- gfp_t gfp)
+struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp)
{
struct bio *new = bio_alloc(gfp, nr_pages);

@@ -87,7 +86,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
req_sects = end_sect - sector;
}

- bio = next_bio(bio, 0, gfp_mask);
+ bio = blk_next_bio(bio, 0, gfp_mask);
bio->bi_iter.bi_sector = sector;
bio_set_dev(bio, bdev);
bio_set_op_attrs(bio, op, 0);
@@ -189,7 +188,7 @@ static int __blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
max_write_same_sectors = UINT_MAX >> 9;

while (nr_sects) {
- bio = next_bio(bio, 1, gfp_mask);
+ bio = blk_next_bio(bio, 1, gfp_mask);
bio->bi_iter.bi_sector = sector;
bio_set_dev(bio, bdev);
bio->bi_vcnt = 1;
@@ -265,7 +264,7 @@ static int __blkdev_issue_write_zeroes(struct block_device *bdev,
return -EOPNOTSUPP;

while (nr_sects) {
- bio = next_bio(bio, 0, gfp_mask);
+ bio = blk_next_bio(bio, 0, gfp_mask);
bio->bi_iter.bi_sector = sector;
bio_set_dev(bio, bdev);
bio->bi_opf = REQ_OP_WRITE_ZEROES;
@@ -316,8 +315,8 @@ static int __blkdev_issue_zero_pages(struct block_device *bdev,
return -EPERM;

while (nr_sects != 0) {
- bio = next_bio(bio, __blkdev_sectors_to_bio_pages(nr_sects),
- gfp_mask);
+ bio = blk_next_bio(bio, __blkdev_sectors_to_bio_pages(nr_sects),
+ gfp_mask);
bio->bi_iter.bi_sector = sector;
bio_set_dev(bio, bdev);
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index bb4ed69f917f..5d967fd39fbd 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -13,6 +13,8 @@
#include <linux/rbtree.h>
#include <linux/blkdev.h>

+#include "blk.h"
+
static inline sector_t blk_zone_start(struct request_queue *q,
sector_t sector)
{
@@ -277,16 +279,17 @@ int blkdev_reset_zones(struct block_device *bdev,
struct request_queue *q = bdev_get_queue(bdev);
sector_t zone_sectors;
sector_t end_sector = sector + nr_sectors;
- struct bio *bio;
+ struct bio *bio = NULL;
+ struct blk_plug plug;
int ret;

- if (!q)
- return -ENXIO;
-
if (!blk_queue_is_zoned(q))
return -EOPNOTSUPP;

- if (end_sector > bdev->bd_part->nr_sects)
+ if (bdev_read_only(bdev))
+ return -EPERM;
+
+ if (!nr_sectors || end_sector > bdev->bd_part->nr_sects)
/* Out of range */
return -EINVAL;

@@ -299,19 +302,14 @@ int blkdev_reset_zones(struct block_device *bdev,
end_sector != bdev->bd_part->nr_sects)
return -EINVAL;

+ blk_start_plug(&plug);
while (sector < end_sector) {

- bio = bio_alloc(gfp_mask, 0);
+ bio = blk_next_bio(bio, 0, gfp_mask);
bio->bi_iter.bi_sector = sector;
bio_set_dev(bio, bdev);
bio_set_op_attrs(bio, REQ_OP_ZONE_RESET, 0);

- ret = submit_bio_wait(bio);
- bio_put(bio);
-
- if (ret)
- return ret;
-
sector += zone_sectors;

/* This may take a while, so be nice to others */
@@ -319,7 +317,12 @@ int blkdev_reset_zones(struct block_device *bdev,

}

- return 0;
+ ret = submit_bio_wait(bio);
+ bio_put(bio);
+
+ blk_finish_plug(&plug);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(blkdev_reset_zones);

diff --git a/block/blk.h b/block/blk.h
index 9db4e389582c..3d67844676fb 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -421,4 +421,6 @@ extern int blk_iolatency_init(struct request_queue *q);
static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
#endif

+struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
+
#endif /* BLK_INTERNAL_H */
--
2.17.1