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@xxxxxx>
---
include/linux/swap.h | 1 -
mm/page_io.c | 45 +++++++++++++-------------------------------
mm/swapfile.c | 10 ----------
3 files changed, 13 insertions(+), 43 deletions(-)
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 596bc2f4d9b03e..3f1f7ae0fbe9e1 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -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);
diff --git a/mm/page_io.c b/mm/page_io.c
index a75f35464a4e73..92f7941c6d018b 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -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);
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 9fffc5af29d1b9..bfa9e8b0c2ef61 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -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
*/
--
2.29.2
