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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 /drivers/block/brd.c
parent19416123ab3e1348b3532347af221d8f60838431 (diff)
downloadlinux-3e08773c3841e9db7a520908cc2b136a77d275ff.tar.bz2
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 'drivers/block/brd.c')
-rw-r--r--drivers/block/brd.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 530b31240203..aa0472718dce 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -282,7 +282,7 @@ out:
return err;
}
-static blk_qc_t brd_submit_bio(struct bio *bio)
+static void brd_submit_bio(struct bio *bio)
{
struct brd_device *brd = bio->bi_bdev->bd_disk->private_data;
sector_t sector = bio->bi_iter.bi_sector;
@@ -299,16 +299,14 @@ static blk_qc_t brd_submit_bio(struct bio *bio)
err = brd_do_bvec(brd, bvec.bv_page, len, bvec.bv_offset,
bio_op(bio), sector);
- if (err)
- goto io_error;
+ if (err) {
+ bio_io_error(bio);
+ return;
+ }
sector += len >> SECTOR_SHIFT;
}
bio_endio(bio);
- return BLK_QC_T_NONE;
-io_error:
- bio_io_error(bio);
- return BLK_QC_T_NONE;
}
static int brd_rw_page(struct block_device *bdev, sector_t sector,