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mm: remove get_swap_bio 

Just reuse the block_device and sector from the swap_info structure,
just as used by the SWP_SYNCHRONOUS path.  Also remove the checks for
NULL returns from bio_alloc as that can't happen for sleeping
allocations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Acked-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-01-26 15:52:47 +01:00 committed by Jens Axboe
parent 64820ac6c6
commit 48d15436fd
3 changed files with 13 additions and 43 deletions
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1
include/linux/swap.h
View File

@ -468,7 +468,6 @@ extern int free_swap_and_cache(swp_entry_t);
int swap_type_of(dev_t device, sector_t offset);
int find_first_swap(dev_t *device);
extern unsigned int count_swap_pages(int, int);
extern sector_t map_swap_page(struct page *, struct block_device **);
extern sector_t swapdev_block(int, pgoff_t);
extern int page_swapcount(struct page *);
extern int __swap_count(swp_entry_t entry);

45
mm/page_io.c
View File

@ -26,25 +26,6 @@
#include <linux/uio.h>
#include <linux/sched/task.h>
static struct bio *get_swap_bio(gfp_t gfp_flags,
struct page *page, bio_end_io_t end_io)
{
struct bio *bio;
bio = bio_alloc(gfp_flags, 1);
if (bio) {
struct block_device *bdev;
bio->bi_iter.bi_sector = map_swap_page(page, &bdev);
bio_set_dev(bio, bdev);
bio->bi_iter.bi_sector <<= PAGE_SHIFT - 9;
bio->bi_end_io = end_io;
bio_add_page(bio, page, thp_size(page), 0);
}
return bio;
}
void end_swap_bio_write(struct bio *bio)
{
struct page *page = bio_first_page_all(bio);
@ -361,13 +342,13 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
return 0;
}
bio = get_swap_bio(GFP_NOIO, page, end_write_func);
if (bio == NULL) {
set_page_dirty(page);
unlock_page(page);
return -ENOMEM;
}
bio = bio_alloc(GFP_NOIO, 1);
bio_set_dev(bio, sis->bdev);
bio->bi_iter.bi_sector = swap_page_sector(page);
bio->bi_opf = REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc);
bio->bi_end_io = end_write_func;
bio_add_page(bio, page, thp_size(page), 0);
bio_associate_blkg_from_page(bio, page);
count_swpout_vm_event(page);
set_page_writeback(page);
@ -427,18 +408,18 @@ int swap_readpage(struct page *page, bool synchronous)
}
ret = 0;
bio = get_swap_bio(GFP_KERNEL, page, end_swap_bio_read);
if (bio == NULL) {
unlock_page(page);
ret = -ENOMEM;
goto out;
}
bio = bio_alloc(GFP_KERNEL, 1);
bio_set_dev(bio, sis->bdev);
bio->bi_opf = REQ_OP_READ;
bio->bi_iter.bi_sector = swap_page_sector(page);
bio->bi_end_io = end_swap_bio_read;
bio_add_page(bio, page, thp_size(page), 0);
disk = bio->bi_bdev->bd_disk;
/*
* Keep this task valid during swap readpage because the oom killer may
* attempt to access it in the page fault retry time check.
*/
bio_set_op_attrs(bio, REQ_OP_READ, 0);
if (synchronous) {
bio->bi_opf |= REQ_HIPRI;
get_task_struct(current);

10
mm/swapfile.c
View File

@ -2301,16 +2301,6 @@ static sector_t map_swap_entry(swp_entry_t entry, struct block_device **bdev)
return se->start_block + (offset - se->start_page);
}
/*
* Returns the page offset into bdev for the specified page's swap entry.
*/
sector_t map_swap_page(struct page *page, struct block_device **bdev)
{
swp_entry_t entry;
entry.val = page_private(page);
return map_swap_entry(entry, bdev);
}
/*
* Free all of a swapdev's extent information
*/