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![Lukas Czerner](/assets/img/avatar_default.png)
In blkdev_issue_zeroout() we are submitting regular WRITE bios, so we do not need to check for -EOPNOTSUPP specifically in case of error. Also there is no need to have label submit: because there is no way to jump out from the while cycle without an error and we really want to exit, rather than try again. And also remove the check for (sz == 0) since at that point sz can never be zero. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> CC: Dmitry Monakhov <dmonakhov@openvz.org> CC: Jens Axboe <jaxboe@fusionio.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
180 lines
3.9 KiB
C
180 lines
3.9 KiB
C
/*
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* Functions related to generic helpers functions
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/scatterlist.h>
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#include "blk.h"
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struct bio_batch {
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atomic_t done;
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unsigned long flags;
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struct completion *wait;
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};
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static void bio_batch_end_io(struct bio *bio, int err)
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{
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struct bio_batch *bb = bio->bi_private;
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if (err) {
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if (err == -EOPNOTSUPP)
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set_bit(BIO_EOPNOTSUPP, &bb->flags);
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clear_bit(BIO_UPTODATE, &bb->flags);
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}
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if (atomic_dec_and_test(&bb->done))
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complete(bb->wait);
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bio_put(bio);
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}
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/**
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* blkdev_issue_discard - queue a discard
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* @bdev: blockdev to issue discard for
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* @sector: start sector
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* @nr_sects: number of sectors to discard
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* @gfp_mask: memory allocation flags (for bio_alloc)
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* @flags: BLKDEV_IFL_* flags to control behaviour
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*
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* Description:
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* Issue a discard request for the sectors in question.
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*/
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int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
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{
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DECLARE_COMPLETION_ONSTACK(wait);
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struct request_queue *q = bdev_get_queue(bdev);
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int type = REQ_WRITE | REQ_DISCARD;
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unsigned int max_discard_sectors;
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struct bio_batch bb;
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struct bio *bio;
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int ret = 0;
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if (!q)
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return -ENXIO;
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if (!blk_queue_discard(q))
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return -EOPNOTSUPP;
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/*
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* Ensure that max_discard_sectors is of the proper
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* granularity
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*/
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max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9);
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if (q->limits.discard_granularity) {
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unsigned int disc_sects = q->limits.discard_granularity >> 9;
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max_discard_sectors &= ~(disc_sects - 1);
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}
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if (flags & BLKDEV_DISCARD_SECURE) {
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if (!blk_queue_secdiscard(q))
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return -EOPNOTSUPP;
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type |= REQ_SECURE;
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}
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atomic_set(&bb.done, 1);
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bb.flags = 1 << BIO_UPTODATE;
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bb.wait = &wait;
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while (nr_sects) {
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bio = bio_alloc(gfp_mask, 1);
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if (!bio) {
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ret = -ENOMEM;
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break;
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}
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bio->bi_sector = sector;
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bio->bi_end_io = bio_batch_end_io;
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bio->bi_bdev = bdev;
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bio->bi_private = &bb;
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if (nr_sects > max_discard_sectors) {
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bio->bi_size = max_discard_sectors << 9;
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nr_sects -= max_discard_sectors;
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sector += max_discard_sectors;
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} else {
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bio->bi_size = nr_sects << 9;
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nr_sects = 0;
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}
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atomic_inc(&bb.done);
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submit_bio(type, bio);
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}
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/* Wait for bios in-flight */
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if (!atomic_dec_and_test(&bb.done))
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wait_for_completion(&wait);
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if (test_bit(BIO_EOPNOTSUPP, &bb.flags))
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ret = -EOPNOTSUPP;
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else if (!test_bit(BIO_UPTODATE, &bb.flags))
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ret = -EIO;
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return ret;
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}
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EXPORT_SYMBOL(blkdev_issue_discard);
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/**
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* blkdev_issue_zeroout - generate number of zero filed write bios
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* @bdev: blockdev to issue
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* @sector: start sector
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* @nr_sects: number of sectors to write
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* @gfp_mask: memory allocation flags (for bio_alloc)
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*
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* Description:
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* Generate and issue number of bios with zerofiled pages.
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*/
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int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask)
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{
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int ret;
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struct bio *bio;
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struct bio_batch bb;
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unsigned int sz;
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DECLARE_COMPLETION_ONSTACK(wait);
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atomic_set(&bb.done, 1);
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bb.flags = 1 << BIO_UPTODATE;
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bb.wait = &wait;
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ret = 0;
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while (nr_sects != 0) {
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bio = bio_alloc(gfp_mask,
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min(nr_sects, (sector_t)BIO_MAX_PAGES));
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if (!bio) {
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ret = -ENOMEM;
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break;
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}
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bio->bi_sector = sector;
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bio->bi_bdev = bdev;
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bio->bi_end_io = bio_batch_end_io;
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bio->bi_private = &bb;
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while (nr_sects != 0) {
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sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects);
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ret = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0);
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nr_sects -= ret >> 9;
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sector += ret >> 9;
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if (ret < (sz << 9))
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break;
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}
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ret = 0;
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atomic_inc(&bb.done);
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submit_bio(WRITE, bio);
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}
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/* Wait for bios in-flight */
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if (!atomic_dec_and_test(&bb.done))
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wait_for_completion(&wait);
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if (!test_bit(BIO_UPTODATE, &bb.flags))
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/* One of bios in the batch was completed with error.*/
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ret = -EIO;
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return ret;
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}
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EXPORT_SYMBOL(blkdev_issue_zeroout);
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