Release 4.9 block/blk-lib.c
/*
* 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 struct bio *next_bio(struct bio *bio, unsigned int nr_pages,
gfp_t gfp)
{
struct bio *new = bio_alloc(gfp, nr_pages);
if (bio) {
bio_chain(bio, new);
submit_bio(bio);
}
return new;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| christoph hellwig | christoph hellwig | 30 | 56.60% | 2 | 50.00% |
| dmitriy monakhov | dmitriy monakhov | 19 | 35.85% | 1 | 25.00% |
| lukas czerner | lukas czerner | 4 | 7.55% | 1 | 25.00% |
| Total | 53 | 100.00% | 4 | 100.00% |
int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, int flags,
struct bio **biop)
{
struct request_queue *q = bdev_get_queue(bdev);
struct bio *bio = *biop;
unsigned int granularity;
enum req_op op;
int alignment;
sector_t bs_mask;
if (!q)
return -ENXIO;
if (flags & BLKDEV_DISCARD_SECURE) {
if (flags & BLKDEV_DISCARD_ZERO)
return -EOPNOTSUPP;
if (!blk_queue_secure_erase(q))
return -EOPNOTSUPP;
op = REQ_OP_SECURE_ERASE;
} else {
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
if ((flags & BLKDEV_DISCARD_ZERO) &&
!q->limits.discard_zeroes_data)
return -EOPNOTSUPP;
op = REQ_OP_DISCARD;
}
bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
if ((sector | nr_sects) & bs_mask)
return -EINVAL;
/* Zero-sector (unknown) and one-sector granularities are the same. */
granularity = max(q->limits.discard_granularity >> 9, 1U);
alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
while (nr_sects) {
unsigned int req_sects;
sector_t end_sect, tmp;
/* Make sure bi_size doesn't overflow */
req_sects = min_t(sector_t, nr_sects, UINT_MAX >> 9);
/**
* If splitting a request, and the next starting sector would be
* misaligned, stop the discard at the previous aligned sector.
*/
end_sect = sector + req_sects;
tmp = end_sect;
if (req_sects < nr_sects &&
sector_div(tmp, granularity) != alignment) {
end_sect = end_sect - alignment;
sector_div(end_sect, granularity);
end_sect = end_sect * granularity + alignment;
req_sects = end_sect - sector;
}
bio = next_bio(bio, 1, gfp_mask);
bio->bi_iter.bi_sector = sector;
bio->bi_bdev = bdev;
bio_set_op_attrs(bio, op, 0);
bio->bi_iter.bi_size = req_sects << 9;
nr_sects -= req_sects;
sector = end_sect;
/*
* We can loop for a long time in here, if someone does
* full device discards (like mkfs). Be nice and allow
* us to schedule out to avoid softlocking if preempt
* is disabled.
*/
cond_resched();
}
*biop = bio;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| christoph hellwig | christoph hellwig | 94 | 27.25% | 4 | 26.67% |
| dmitriy monakhov | dmitriy monakhov | 91 | 26.38% | 1 | 6.67% |
| ming lin | ming lin | 83 | 24.06% | 1 | 6.67% |
| darrick j. wong | darrick j. wong | 30 | 8.70% | 1 | 6.67% |
| paolo bonzini | paolo bonzini | 26 | 7.54% | 1 | 6.67% |
| jens axboe | jens axboe | 9 | 2.61% | 2 | 13.33% |
| michael christie | michael christie | 6 | 1.74% | 2 | 13.33% |
| kent overstreet | kent overstreet | 4 | 1.16% | 1 | 6.67% |
| shaohua li | shaohua li | 1 | 0.29% | 1 | 6.67% |
| lukas czerner | lukas czerner | 1 | 0.29% | 1 | 6.67% |
| Total | 345 | 100.00% | 15 | 100.00% |
EXPORT_SYMBOL(__blkdev_issue_discard);
/**
* 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)
{
struct bio *bio = NULL;
struct blk_plug plug;
int ret;
blk_start_plug(&plug);
ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, flags,
&bio);
if (!ret && bio) {
ret = submit_bio_wait(bio);
if (ret == -EOPNOTSUPP && !(flags & BLKDEV_DISCARD_ZERO))
ret = 0;
bio_put(bio);
}
blk_finish_plug(&plug);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| christoph hellwig | christoph hellwig | 79 | 72.48% | 4 | 50.00% |
| mike snitzer | mike snitzer | 13 | 11.93% | 1 | 12.50% |
| dmitriy monakhov | dmitriy monakhov | 8 | 7.34% | 1 | 12.50% |
| shaun tancheff | shaun tancheff | 5 | 4.59% | 1 | 12.50% |
| lukas czerner | lukas czerner | 4 | 3.67% | 1 | 12.50% |
| Total | 109 | 100.00% | 8 | 100.00% |
EXPORT_SYMBOL(blkdev_issue_discard);
/**
* blkdev_issue_write_same - queue a write same operation
* @bdev: target blockdev
* @sector: start sector
* @nr_sects: number of sectors to write
* @gfp_mask: memory allocation flags (for bio_alloc)
* @page: page containing data to write
*
* Description:
* Issue a write same request for the sectors in question.
*/
int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask,
struct page *page)
{
struct request_queue *q = bdev_get_queue(bdev);
unsigned int max_write_same_sectors;
struct bio *bio = NULL;
int ret = 0;
sector_t bs_mask;
if (!q)
return -ENXIO;
bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
if ((sector | nr_sects) & bs_mask)
return -EINVAL;
/* Ensure that max_write_same_sectors doesn't overflow bi_size */
max_write_same_sectors = UINT_MAX >> 9;
while (nr_sects) {
bio = next_bio(bio, 1, gfp_mask);
bio->bi_iter.bi_sector = sector;
bio->bi_bdev = bdev;
bio->bi_vcnt = 1;
bio->bi_io_vec->bv_page = page;
bio->bi_io_vec->bv_offset = 0;
bio->bi_io_vec->bv_len = bdev_logical_block_size(bdev);
bio_set_op_attrs(bio, REQ_OP_WRITE_SAME, 0);
if (nr_sects > max_write_same_sectors) {
bio->bi_iter.bi_size = max_write_same_sectors << 9;
nr_sects -= max_write_same_sectors;
sector += max_write_same_sectors;
} else {
bio->bi_iter.bi_size = nr_sects << 9;
nr_sects = 0;
}
}
if (bio) {
ret = submit_bio_wait(bio);
bio_put(bio);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| martin k. petersen | martin k. petersen | 162 | 69.53% | 1 | 12.50% |
| darrick j. wong | darrick j. wong | 30 | 12.88% | 1 | 12.50% |
| christoph hellwig | christoph hellwig | 15 | 6.44% | 1 | 12.50% |
| michael christie | michael christie | 9 | 3.86% | 2 | 25.00% |
| shaun tancheff | shaun tancheff | 7 | 3.00% | 1 | 12.50% |
| kent overstreet | kent overstreet | 6 | 2.58% | 1 | 12.50% |
| ming lin | ming lin | 4 | 1.72% | 1 | 12.50% |
| Total | 233 | 100.00% | 8 | 100.00% |
EXPORT_SYMBOL(blkdev_issue_write_same);
/**
* blkdev_issue_zeroout - generate number of zero filed write bios
* @bdev: blockdev to issue
* @sector: start sector
* @nr_sects: number of sectors to write
* @gfp_mask: memory allocation flags (for bio_alloc)
*
* Description:
* Generate and issue number of bios with zerofiled pages.
*/
static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask)
{
int ret;
struct bio *bio = NULL;
unsigned int sz;
sector_t bs_mask;
bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
if ((sector | nr_sects) & bs_mask)
return -EINVAL;
while (nr_sects != 0) {
bio = next_bio(bio, min(nr_sects, (sector_t)BIO_MAX_PAGES),
gfp_mask);
bio->bi_iter.bi_sector = sector;
bio->bi_bdev = bdev;
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
while (nr_sects != 0) {
sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects);
ret = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0);
nr_sects -= ret >> 9;
sector += ret >> 9;
if (ret < (sz << 9))
break;
}
}
if (bio) {
ret = submit_bio_wait(bio);
bio_put(bio);
return ret;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| dmitriy monakhov | dmitriy monakhov | 130 | 64.68% | 1 | 8.33% |
| darrick j. wong | darrick j. wong | 30 | 14.93% | 1 | 8.33% |
| shaun tancheff | shaun tancheff | 12 | 5.97% | 1 | 8.33% |
| christoph hellwig | christoph hellwig | 12 | 5.97% | 2 | 16.67% |
| michael christie | michael christie | 9 | 4.48% | 2 | 16.67% |
| jens axboe | jens axboe | 3 | 1.49% | 1 | 8.33% |
| kent overstreet | kent overstreet | 2 | 1.00% | 1 | 8.33% |
| fabian frederick | fabian frederick | 1 | 0.50% | 1 | 8.33% |
| lukas czerner | lukas czerner | 1 | 0.50% | 1 | 8.33% |
| martin k. petersen | martin k. petersen | 1 | 0.50% | 1 | 8.33% |
| Total | 201 | 100.00% | 12 | 100.00% |
/**
* blkdev_issue_zeroout - zero-fill a block range
* @bdev: blockdev to write
* @sector: start sector
* @nr_sects: number of sectors to write
* @gfp_mask: memory allocation flags (for bio_alloc)
* @discard: whether to discard the block range
*
* Description:
* Zero-fill a block range. If the discard flag is set and the block
* device guarantees that subsequent READ operations to the block range
* in question will return zeroes, the blocks will be discarded. Should
* the discard request fail, if the discard flag is not set, or if
* discard_zeroes_data is not supported, this function will resort to
* zeroing the blocks manually, thus provisioning (allocating,
* anchoring) them. If the block device supports the WRITE SAME command
* blkdev_issue_zeroout() will use it to optimize the process of
* clearing the block range. Otherwise the zeroing will be performed
* using regular WRITE calls.
*/
int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, bool discard)
{
if (discard) {
if (!blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask,
BLKDEV_DISCARD_ZERO))
return 0;
}
if (bdev_write_same(bdev) &&
blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask,
ZERO_PAGE(0)) == 0)
return 0;
return __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| martin k. petersen | martin k. petersen | 80 | 91.95% | 3 | 75.00% |
| christoph hellwig | christoph hellwig | 7 | 8.05% | 1 | 25.00% |
| Total | 87 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL(blkdev_issue_zeroout);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| dmitriy monakhov | dmitriy monakhov | 277 | 25.86% | 2 | 6.90% |
| martin k. petersen | martin k. petersen | 250 | 23.34% | 4 | 13.79% |
| christoph hellwig | christoph hellwig | 243 | 22.69% | 5 | 17.24% |
| darrick j. wong | darrick j. wong | 90 | 8.40% | 1 | 3.45% |
| ming lin | ming lin | 87 | 8.12% | 2 | 6.90% |
| paolo bonzini | paolo bonzini | 26 | 2.43% | 1 | 3.45% |
| shaun tancheff | shaun tancheff | 24 | 2.24% | 1 | 3.45% |
| michael christie | michael christie | 24 | 2.24% | 3 | 10.34% |
| mike snitzer | mike snitzer | 13 | 1.21% | 1 | 3.45% |
| kent overstreet | kent overstreet | 12 | 1.12% | 1 | 3.45% |
| jens axboe | jens axboe | 12 | 1.12% | 3 | 10.34% |
| lukas czerner | lukas czerner | 10 | 0.93% | 2 | 6.90% |
| fabian frederick | fabian frederick | 1 | 0.09% | 1 | 3.45% |
| tao ma | tao ma | 1 | 0.09% | 1 | 3.45% |
| shaohua li | shaohua li | 1 | 0.09% | 1 | 3.45% |
| Total | 1071 | 100.00% | 29 | 100.00% |