mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 22:21:40 +00:00
blkdev: move blkdev_issue helper functions to separate file
Move blkdev_issue_discard from blk-barrier.c because it is not barrier related. Later the file will be populated by other helpers. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Dmitry Monakhov
Jens Axboe
parent
f17e232e92
commit
f31e7e4022
@ -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
|
||||
|
||||
@ -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);
|
||||
|
||||
114
block/blk-lib.c
Normal file
114
block/blk-lib.c
Normal file
@ -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);
|
||||
Loading…
Reference in New Issue
Block a user