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authorChristoph Hellwig <hch@lst.de>2021-10-12 13:12:24 +0200
committerJens Axboe <axboe@kernel.dk>2021-10-18 06:17:36 -0600
commit3e08773c3841e9db7a520908cc2b136a77d275ff (patch)
tree5dce4a3944899f0eb1370a92130e89134da2a714 /mm/page_io.c
parent19416123ab3e1348b3532347af221d8f60838431 (diff)
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/page_io.c')
-rw-r--r--mm/page_io.c8
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);