diff options
| author |   Christoph Hellwig <hch@lst.de> | 2021-10-12 13:12:24 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-10-18 06:17:36 -0600 |
| commit | 3e08773c3841e9db7a520908cc2b136a77d275ff (patch) | |
| tree | 5dce4a3944899f0eb1370a92130e89134da2a714 /mm | |
| parent | block: define 'struct bvec_iter' as packed (diff) | |
| download | linux-dev-3e08773c3841e9db7a520908cc2b136a77d275ff.tar.xz linux-dev-3e08773c3841e9db7a520908cc2b136a77d275ff.zip | |
block: switch polling to be bio based
Replace the blk_poll interface that requires the caller to keep a queue
and cookie from the submissions with polling based on the bio.
Polling for the bio itself leads to a few advantages:
- the cookie construction can made entirely private in blk-mq.c
- the caller does not need to remember the request_queue and cookie
separately and thus sidesteps their lifetime issues
- keeping the device and the cookie inside the bio allows to trivially
support polling BIOs remapping by stacking drivers
- a lot of code to propagate the cookie back up the submission path can
be removed entirely.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Mark Wunderlich <mark.wunderlich@intel.com>
Link: https://lore.kernel.org/r/20211012111226.760968-15-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_io.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/mm/page_io.c b/mm/page_io.c index ed2eded74f3a..a68faab5b310 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -358,8 +358,6 @@ int swap_readpage(struct page *page, bool synchronous) struct bio *bio; int ret = 0; struct swap_info_struct *sis = page_swap_info(page); - blk_qc_t qc; - struct gendisk *disk; unsigned long pflags; VM_BUG_ON_PAGE(!PageSwapCache(page) && !synchronous, page); @@ -409,8 +407,6 @@ int swap_readpage(struct page *page, bool synchronous) 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. @@ -422,13 +418,13 @@ int swap_readpage(struct page *page, bool synchronous) } count_vm_event(PSWPIN); bio_get(bio); - qc = submit_bio(bio); + submit_bio(bio); while (synchronous) { set_current_state(TASK_UNINTERRUPTIBLE); if (!READ_ONCE(bio->bi_private)) break; - if (!blk_poll(disk->queue, qc, 0)) + if (!bio_poll(bio, 0)) blk_io_schedule(); } __set_current_state(TASK_RUNNING); |