diff options
| -rw-r--r-- | block/Makefile | 2 | ||||
| -rw-r--r-- | block/blk-barrier.c | 104 | ||||
| -rw-r--r-- | block/blk-lib.c | 114 |
3 files changed, 115 insertions, 105 deletions
diff --git a/block/Makefile b/block/Makefile index cb2d515..0bb499a 100644 --- a/block/Makefile +++ b/block/Makefile @@ -5,7 +5,7 @@ obj-$(CONFIG_BLOCK) := elevator.o blk-core.o blk-tag.o blk-sysfs.o \ blk-barrier.o blk-settings.o blk-ioc.o blk-map.o \ blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \ - blk-iopoll.o ioctl.o genhd.o scsi_ioctl.o + blk-iopoll.o blk-lib.o ioctl.o genhd.o scsi_ioctl.o obj-$(CONFIG_BLK_DEV_BSG) += bsg.o obj-$(CONFIG_BLK_CGROUP) += blk-cgroup.o diff --git a/block/blk-barrier.c b/block/blk-barrier.c index f11eec9..0d710c9 100644 --- a/block/blk-barrier.c +++ b/block/blk-barrier.c @@ -347,107 +347,3 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, return ret; } EXPORT_SYMBOL(blkdev_issue_flush); - -static void blkdev_discard_end_io(struct bio *bio, int err) -{ - if (err) { - if (err == -EOPNOTSUPP) - set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); - clear_bit(BIO_UPTODATE, &bio->bi_flags); - } - - if (bio->bi_private) - complete(bio->bi_private); - __free_page(bio_page(bio)); - - bio_put(bio); -} - -/** - * blkdev_issue_discard - queue a discard - * @bdev: blockdev to issue discard for - * @sector: start sector - * @nr_sects: number of sectors to discard - * @gfp_mask: memory allocation flags (for bio_alloc) - * @flags: BLKDEV_IFL_* flags to control behaviour - * - * Description: - * Issue a discard request for the sectors in question. - */ -int blkdev_issue_discard(struct block_device *bdev, sector_t sector, - sector_t nr_sects, gfp_t gfp_mask, unsigned long flags) -{ - DECLARE_COMPLETION_ONSTACK(wait); - struct request_queue *q = bdev_get_queue(bdev); - int type = flags & BLKDEV_IFL_BARRIER ? - DISCARD_BARRIER : DISCARD_NOBARRIER; - struct bio *bio; - struct page *page; - int ret = 0; - - if (!q) - return -ENXIO; - - if (!blk_queue_discard(q)) - return -EOPNOTSUPP; - - while (nr_sects && !ret) { - unsigned int sector_size = q->limits.logical_block_size; - unsigned int max_discard_sectors = - min(q->limits.max_discard_sectors, UINT_MAX >> 9); - - bio = bio_alloc(gfp_mask, 1); - if (!bio) - goto out; - bio->bi_sector = sector; - bio->bi_end_io = blkdev_discard_end_io; - bio->bi_bdev = bdev; - if (flags & BLKDEV_IFL_WAIT) - bio->bi_private = &wait; - - /* - * Add a zeroed one-sector payload as that's what - * our current implementations need. If we'll ever need - * more the interface will need revisiting. - */ - page = alloc_page(gfp_mask | __GFP_ZERO); - if (!page) - goto out_free_bio; - if (bio_add_pc_page(q, bio, page, sector_size, 0) < sector_size) - goto out_free_page; - - /* - * And override the bio size - the way discard works we - * touch many more blocks on disk than the actual payload - * length. - */ - if (nr_sects > max_discard_sectors) { - bio->bi_size = max_discard_sectors << 9; - nr_sects -= max_discard_sectors; - sector += max_discard_sectors; - } else { - bio->bi_size = nr_sects << 9; - nr_sects = 0; - } - - bio_get(bio); - submit_bio(type, bio); - - if (flags & BLKDEV_IFL_WAIT) - wait_for_completion(&wait); - - if (bio_flagged(bio, BIO_EOPNOTSUPP)) - ret = -EOPNOTSUPP; - else if (!bio_flagged(bio, BIO_UPTODATE)) - ret = -EIO; - bio_put(bio); - } - return ret; -out_free_page: - __free_page(page); -out_free_bio: - bio_put(bio); -out: - return -ENOMEM; -} -EXPORT_SYMBOL(blkdev_issue_discard); diff --git a/block/blk-lib.c b/block/blk-lib.c new file mode 100644 index 0000000..0dc4388 --- /dev/null +++ b/block/blk-lib.c @@ -0,0 +1,114 @@ +/* + * Functions related to generic helpers functions + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/bio.h> +#include <linux/blkdev.h> +#include <linux/scatterlist.h> + +#include "blk.h" + +static void blkdev_discard_end_io(struct bio *bio, int err) +{ + if (err) { + if (err == -EOPNOTSUPP) + set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); + clear_bit(BIO_UPTODATE, &bio->bi_flags); + } + + if (bio->bi_private) + complete(bio->bi_private); + __free_page(bio_page(bio)); + + bio_put(bio); +} + +/** + * blkdev_issue_discard - queue a discard + * @bdev: blockdev to issue discard for + * @sector: start sector + * @nr_sects: number of sectors to discard + * @gfp_mask: memory allocation flags (for bio_alloc) + * @flags: BLKDEV_IFL_* flags to control behaviour + * + * Description: + * Issue a discard request for the sectors in question. + */ +int blkdev_issue_discard(struct block_device *bdev, sector_t sector, + sector_t nr_sects, gfp_t gfp_mask, unsigned long flags) +{ + DECLARE_COMPLETION_ONSTACK(wait); + struct request_queue *q = bdev_get_queue(bdev); + int type = flags & BLKDEV_IFL_BARRIER ? + DISCARD_BARRIER : DISCARD_NOBARRIER; + struct bio *bio; + struct page *page; + int ret = 0; + + if (!q) + return -ENXIO; + + if (!blk_queue_discard(q)) + return -EOPNOTSUPP; + + while (nr_sects && !ret) { + unsigned int sector_size = q->limits.logical_block_size; + unsigned int max_discard_sectors = + min(q->limits.max_discard_sectors, UINT_MAX >> 9); + + bio = bio_alloc(gfp_mask, 1); + if (!bio) + goto out; + bio->bi_sector = sector; + bio->bi_end_io = blkdev_discard_end_io; + bio->bi_bdev = bdev; + if (flags & BLKDEV_IFL_WAIT) + bio->bi_private = &wait; + + /* + * Add a zeroed one-sector payload as that's what + * our current implementations need. If we'll ever need + * more the interface will need revisiting. + */ + page = alloc_page(gfp_mask | __GFP_ZERO); + if (!page) + goto out_free_bio; + if (bio_add_pc_page(q, bio, page, sector_size, 0) < sector_size) + goto out_free_page; + + /* + * And override the bio size - the way discard works we + * touch many more blocks on disk than the actual payload + * length. + */ + if (nr_sects > max_discard_sectors) { + bio->bi_size = max_discard_sectors << 9; + nr_sects -= max_discard_sectors; + sector += max_discard_sectors; + } else { + bio->bi_size = nr_sects << 9; + nr_sects = 0; + } + + bio_get(bio); + submit_bio(type, bio); + + if (flags & BLKDEV_IFL_WAIT) + wait_for_completion(&wait); + + if (bio_flagged(bio, BIO_EOPNOTSUPP)) + ret = -EOPNOTSUPP; + else if (!bio_flagged(bio, BIO_UPTODATE)) + ret = -EIO; + bio_put(bio); + } + return ret; +out_free_page: + __free_page(page); +out_free_bio: + bio_put(bio); +out: + return -ENOMEM; +} +EXPORT_SYMBOL(blkdev_issue_discard); |
