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block: switch polling to be bio based

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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>
This commit is contained in:
Christoph Hellwig
2021-10-12 13:12:24 +02:00
committed by Jens Axboe
parent 19416123ab
commit 3e08773c38
39 changed files with 232 additions and 264 deletions
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2
fs/zonefs/super.c
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@ -1128,7 +1128,7 @@ static const struct file_operations zonefs_file_operations = {
.write_iter = zonefs_file_write_iter,
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.iopoll = iomap_dio_iopoll,
.iopoll = iocb_bio_iopoll,
};
static struct kmem_cache *zonefs_inode_cachep;