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authorDamien Le Moal <damien.lemoal@wdc.com>2018-10-12 19:08:47 +0900
committerJens Axboe <axboe@kernel.dk>2018-10-25 11:17:40 -0600
commita2d6b3a2d39005ab4d4a83481a7db092ebf0e9d6 (patch)
treed099578f43e9d1136c792485f4231a7fe1dc71b3 /block
parent65e4e3eee83d7a4ad7e8c5175b2a0ddfd3b5685f (diff)
downloadblackbird-op-linux-a2d6b3a2d39005ab4d4a83481a7db092ebf0e9d6.tar.gz
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block: Improve zone reset execution
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. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-lib.c13
-rw-r--r--block/blk-zoned.c29
-rw-r--r--block/blk.h2
3 files changed, 24 insertions, 20 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c
index bbd44666f2b5..76f867ea9a9b 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);
@@ -63,7 +62,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
end_sect = sector + req_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_set_op_attrs(bio, op, 0);
@@ -165,7 +164,7 @@ 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;
@@ -241,7 +240,7 @@ 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;
@@ -292,8 +291,8 @@ 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 3d2aecba96a4..93574baaa6b8 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -488,4 +488,6 @@ 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 */
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