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>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 4a9077c..04090ba 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8248,7 +8248,7 @@ static struct btrfs_dio_private *btrfs_create_dio_private(struct bio *dio_bio,
return dip;
}
-static blk_qc_t btrfs_submit_direct(const struct iomap_iter *iter,
+static void btrfs_submit_direct(const struct iomap_iter *iter,
struct bio *dio_bio, loff_t file_offset)
{
struct inode *inode = iter->inode;
@@ -8278,7 +8278,7 @@ static blk_qc_t btrfs_submit_direct(const struct iomap_iter *iter,
}
dio_bio->bi_status = BLK_STS_RESOURCE;
bio_endio(dio_bio);
- return BLK_QC_T_NONE;
+ return;
}
if (!write) {
@@ -8372,15 +8372,13 @@ static blk_qc_t btrfs_submit_direct(const struct iomap_iter *iter,
free_extent_map(em);
} while (submit_len > 0);
- return BLK_QC_T_NONE;
+ return;
out_err_em:
free_extent_map(em);
out_err:
dip->dio_bio->bi_status = status;
btrfs_dio_private_put(dip);
-
- return BLK_QC_T_NONE;
}
const struct iomap_ops btrfs_dio_iomap_ops = {