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mm: factor out a swap_writepage_bdev helper 

Split the block device case from swap_readpage into a separate helper,
following the abstraction for file based swap.

Link: https://lkml.kernel.org/r/20230125133436.447864-7-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Keith Busch <kbusch@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2023-01-25 14:34:35 +01:00 committed by Andrew Morton
parent e3e2762bd3
commit 05cda97ecb
1 changed files with 19 additions and 14 deletions
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33
mm/page_io.c
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@ -326,23 +326,12 @@ static void swap_writepage_fs(struct page *page, struct writeback_control *wbc)
*wbc->swap_plug = sio;
}
void __swap_writepage(struct page *page, struct writeback_control *wbc)
static void swap_writepage_bdev(struct page *page,
struct writeback_control *wbc, struct swap_info_struct *sis)
{
struct bio *bio;
int ret;
struct swap_info_struct *sis = page_swap_info(page);
VM_BUG_ON_PAGE(!PageSwapCache(page), page);
/*
* ->flags can be updated non-atomicially (scan_swap_map_slots),
* but that will never affect SWP_FS_OPS, so the data_race
* is safe.
*/
if (data_race(sis->flags & SWP_FS_OPS))
return swap_writepage_fs(page, wbc);
ret = bdev_write_page(sis->bdev, swap_page_sector(page), page, wbc);
if (!ret) {
if (!bdev_write_page(sis->bdev, swap_page_sector(page), page, wbc)) {
count_swpout_vm_event(page);
return;
}
@ -361,6 +350,22 @@ void __swap_writepage(struct page *page, struct writeback_control *wbc)
submit_bio(bio);
}
void __swap_writepage(struct page *page, struct writeback_control *wbc)
{
struct swap_info_struct *sis = page_swap_info(page);
VM_BUG_ON_PAGE(!PageSwapCache(page), page);
/*
* ->flags can be updated non-atomicially (scan_swap_map_slots),
* but that will never affect SWP_FS_OPS, so the data_race
* is safe.
*/
if (data_race(sis->flags & SWP_FS_OPS))
swap_writepage_fs(page, wbc);
else
swap_writepage_bdev(page, wbc, sis);
}
void swap_write_unplug(struct swap_iocb *sio)
{
struct iov_iter from;