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 /drivers/md/md.c | |
| parent | 19416123ab3e1348b3532347af221d8f60838431 (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 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index ec09083ff0ef..22310d5d8d41 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -443,19 +443,19 @@ check_suspended: } EXPORT_SYMBOL(md_handle_request); -static blk_qc_t md_submit_bio(struct bio *bio) +static void md_submit_bio(struct bio *bio) { const int rw = bio_data_dir(bio); struct mddev *mddev = bio->bi_bdev->bd_disk->private_data; if (mddev == NULL || mddev->pers == NULL) { bio_io_error(bio); - return BLK_QC_T_NONE; + return; } if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) { bio_io_error(bio); - return BLK_QC_T_NONE; + return; } blk_queue_split(&bio); @@ -464,15 +464,13 @@ static blk_qc_t md_submit_bio(struct bio *bio) if (bio_sectors(bio) != 0) bio->bi_status = BLK_STS_IOERR; bio_endio(bio); - return BLK_QC_T_NONE; + return; } /* bio could be mergeable after passing to underlayer */ bio->bi_opf &= ~REQ_NOMERGE; md_handle_request(mddev, bio); - - return BLK_QC_T_NONE; } /* mddev_suspend makes sure no new requests are submitted |