9f9ee1f2b2
blkdev_issue_zeroout() printed a warning if a device failed a discard or write same request despite advertising support for these. That's fine for SCSI since we'll disable these commands if we get an error back from the disk saying that they are not supported. And consequently the warning only gets printed once. There are other types of block devices that support discard, however, and these may return -EOPNOTSUPP for each command but leave discard enabled in the queue limits. This will cause a warning message for every blkdev_issue_zeroout() invocation. Remove the offending warning messages. Reported-by: Sedat Dilek <sedat.dilek@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
318 lines
8 KiB
C
318 lines
8 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 && (err != -EOPNOTSUPP))
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clear_bit(BIO_UPTODATE, &bb->flags);
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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, granularity;
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int alignment;
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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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struct blk_plug plug;
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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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/* Zero-sector (unknown) and one-sector granularities are the same. */
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granularity = max(q->limits.discard_granularity >> 9, 1U);
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alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
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/*
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* Ensure that max_discard_sectors is of the proper
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* granularity, so that requests stay aligned after a split.
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*/
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max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9);
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max_discard_sectors -= max_discard_sectors % granularity;
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if (unlikely(!max_discard_sectors)) {
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/* Avoid infinite loop below. Being cautious never hurts. */
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return -EOPNOTSUPP;
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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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blk_start_plug(&plug);
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while (nr_sects) {
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unsigned int req_sects;
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sector_t end_sect, tmp;
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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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req_sects = min_t(sector_t, nr_sects, max_discard_sectors);
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/*
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* If splitting a request, and the next starting sector would be
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* misaligned, stop the discard at the previous aligned sector.
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*/
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end_sect = sector + req_sects;
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tmp = end_sect;
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if (req_sects < nr_sects &&
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sector_div(tmp, granularity) != alignment) {
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end_sect = end_sect - alignment;
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sector_div(end_sect, granularity);
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end_sect = end_sect * granularity + alignment;
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req_sects = end_sect - sector;
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}
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bio->bi_iter.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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bio->bi_iter.bi_size = req_sects << 9;
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nr_sects -= req_sects;
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sector = end_sect;
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atomic_inc(&bb.done);
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submit_bio(type, bio);
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/*
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* We can loop for a long time in here, if someone does
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* full device discards (like mkfs). Be nice and allow
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* us to schedule out to avoid softlocking if preempt
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* is disabled.
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*/
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cond_resched();
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}
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blk_finish_plug(&plug);
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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_io(&wait);
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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_write_same - queue a write same operation
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* @bdev: target blockdev
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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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* @page: page containing data to write
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*
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* Description:
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* Issue a write same request for the sectors in question.
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*/
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int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask,
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struct page *page)
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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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unsigned int max_write_same_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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max_write_same_sectors = q->limits.max_write_same_sectors;
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if (max_write_same_sectors == 0)
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return -EOPNOTSUPP;
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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_iter.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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bio->bi_vcnt = 1;
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bio->bi_io_vec->bv_page = page;
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bio->bi_io_vec->bv_offset = 0;
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bio->bi_io_vec->bv_len = bdev_logical_block_size(bdev);
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if (nr_sects > max_write_same_sectors) {
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bio->bi_iter.bi_size = max_write_same_sectors << 9;
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nr_sects -= max_write_same_sectors;
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sector += max_write_same_sectors;
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} else {
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bio->bi_iter.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(REQ_WRITE | REQ_WRITE_SAME, 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_io(&wait);
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if (!test_bit(BIO_UPTODATE, &bb.flags))
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ret = -ENOTSUPP;
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return ret;
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}
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EXPORT_SYMBOL(blkdev_issue_write_same);
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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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static 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_iter.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_io(&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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/**
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* blkdev_issue_zeroout - zero-fill a block range
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* @bdev: blockdev to write
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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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* @discard: whether to discard the block range
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*
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* Description:
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* Zero-fill a block range. If the discard flag is set and the block
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* device guarantees that subsequent READ operations to the block range
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* in question will return zeroes, the blocks will be discarded. Should
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* the discard request fail, if the discard flag is not set, or if
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* discard_zeroes_data is not supported, this function will resort to
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* zeroing the blocks manually, thus provisioning (allocating,
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* anchoring) them. If the block device supports the WRITE SAME command
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* blkdev_issue_zeroout() will use it to optimize the process of
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* clearing the block range. Otherwise the zeroing will be performed
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* using regular WRITE calls.
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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, bool discard)
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{
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struct request_queue *q = bdev_get_queue(bdev);
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if (discard && blk_queue_discard(q) && q->limits.discard_zeroes_data &&
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blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, 0) == 0)
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return 0;
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if (bdev_write_same(bdev) &&
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blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask,
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ZERO_PAGE(0)) == 0)
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return 0;
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return __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask);
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}
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EXPORT_SYMBOL(blkdev_issue_zeroout);
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