Pass the block_device and operation that we plan to use this bio for to
bio_alloc_kiocb to optimize the assigment.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx>
---
block/bio.c | 12 ++++++++----
block/fops.c | 17 ++++++++---------
include/linux/bio.h | 4 ++--
3 files changed, 18 insertions(+), 15 deletions(-)
diff --git a/block/bio.c b/block/bio.c
index 9afc0c2aca6e4..6c3efb0fd12b1 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1731,7 +1731,9 @@ EXPORT_SYMBOL(bioset_init_from_src);
/**
* bio_alloc_kiocb - Allocate a bio from bio_set based on kiocb
* @kiocb: kiocb describing the IO
+ * @bdev: block device to allocate the bio for (can be %NULL)
* @nr_vecs: number of iovecs to pre-allocate
+ * @opf: operation and flags for bio
* @bs: bio_set to allocate from
*
* Description:
@@ -1742,14 +1744,14 @@ EXPORT_SYMBOL(bioset_init_from_src);
* MUST be done from process context, not hard/soft IRQ.
*
*/
-struct bio *bio_alloc_kiocb(struct kiocb *kiocb, unsigned short nr_vecs,
- struct bio_set *bs)
+struct bio *bio_alloc_kiocb(struct kiocb *kiocb, struct block_device *bdev,
+ unsigned short nr_vecs, unsigned int opf, struct bio_set *bs)
{
struct bio_alloc_cache *cache;
struct bio *bio;
if (!(kiocb->ki_flags & IOCB_ALLOC_CACHE) || nr_vecs > BIO_INLINE_VECS)
- return bio_alloc_bioset(NULL, nr_vecs, 0, GFP_KERNEL, bs);
+ return bio_alloc_bioset(bdev, nr_vecs, opf, GFP_KERNEL, bs);
cache = per_cpu_ptr(bs->cache, get_cpu());
if (cache->free_list) {
@@ -1758,12 +1760,14 @@ struct bio *bio_alloc_kiocb(struct kiocb *kiocb, unsigned short nr_vecs,
cache->nr--;
put_cpu();
bio_init(bio, nr_vecs ? bio->bi_inline_vecs : NULL, nr_vecs);
+ bio_set_dev(bio, bdev);
+ bio->bi_opf = opf;
bio->bi_pool = bs;
bio_set_flag(bio, BIO_PERCPU_CACHE);
return bio;
}
put_cpu();
- bio = bio_alloc_bioset(NULL, nr_vecs, 0, GFP_KERNEL, bs);
+ bio = bio_alloc_bioset(bdev, nr_vecs, opf, GFP_KERNEL, bs);
bio_set_flag(bio, BIO_PERCPU_CACHE);
return bio;
}
diff --git a/block/fops.c b/block/fops.c
index 26bf15c770d21..3a62b8b912750 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -190,6 +190,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
struct blkdev_dio *dio;
struct bio *bio;
bool is_read = (iov_iter_rw(iter) == READ), is_sync;
+ unsigned int opf = is_read ? REQ_OP_READ : dio_bio_write_op(iocb);
loff_t pos = iocb->ki_pos;
int ret = 0;
@@ -197,7 +198,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
(bdev_logical_block_size(bdev) - 1))
return -EINVAL;
- bio = bio_alloc_kiocb(iocb, nr_pages, &blkdev_dio_pool);
+ bio = bio_alloc_kiocb(iocb, bdev, nr_pages, opf, &blkdev_dio_pool);
dio = container_of(bio, struct blkdev_dio, bio);
atomic_set(&dio->ref, 1);
@@ -223,7 +224,6 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
blk_start_plug(&plug);
for (;;) {
- bio_set_dev(bio, bdev);
bio->bi_iter.bi_sector = pos >> SECTOR_SHIFT;
bio->bi_write_hint = iocb->ki_hint;
bio->bi_private = dio;
@@ -238,11 +238,9 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
}
if (is_read) {
- bio->bi_opf = REQ_OP_READ;
if (dio->flags & DIO_SHOULD_DIRTY)
bio_set_pages_dirty(bio);
} else {
- bio->bi_opf = dio_bio_write_op(iocb);
task_io_account_write(bio->bi_iter.bi_size);
}
if (iocb->ki_flags & IOCB_NOWAIT)
@@ -259,6 +257,8 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
atomic_inc(&dio->ref);
submit_bio(bio);
bio = bio_alloc(GFP_KERNEL, nr_pages);
+ bio_set_dev(bio, bdev);
+ bio->bi_opf = opf;
}
blk_finish_plug(&plug);
@@ -311,6 +311,8 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb,
unsigned int nr_pages)
{
struct block_device *bdev = iocb->ki_filp->private_data;
+ bool is_read = iov_iter_rw(iter) == READ;
+ unsigned int opf = is_read ? REQ_OP_READ : dio_bio_write_op(iocb);
struct blkdev_dio *dio;
struct bio *bio;
loff_t pos = iocb->ki_pos;
@@ -320,11 +322,10 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb,
(bdev_logical_block_size(bdev) - 1))
return -EINVAL;
- bio = bio_alloc_kiocb(iocb, nr_pages, &blkdev_dio_pool);
+ bio = bio_alloc_kiocb(iocb, bdev, nr_pages, opf, &blkdev_dio_pool);
dio = container_of(bio, struct blkdev_dio, bio);
dio->flags = 0;
dio->iocb = iocb;
- bio_set_dev(bio, bdev);
bio->bi_iter.bi_sector = pos >> SECTOR_SHIFT;
bio->bi_write_hint = iocb->ki_hint;
bio->bi_end_io = blkdev_bio_end_io_async;
@@ -347,14 +348,12 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb,
}
dio->size = bio->bi_iter.bi_size;
- if (iov_iter_rw(iter) == READ) {
- bio->bi_opf = REQ_OP_READ;
+ if (is_read) {
if (iter_is_iovec(iter)) {
dio->flags |= DIO_SHOULD_DIRTY;
bio_set_pages_dirty(bio);
}
} else {
- bio->bi_opf = dio_bio_write_op(iocb);
task_io_account_write(bio->bi_iter.bi_size);
}
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 2f63ae9a71e1a..5c5ada2ebb270 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -408,8 +408,8 @@ extern int bioset_init_from_src(struct bio_set *bs, struct bio_set *src);
struct bio *bio_alloc_bioset(struct block_device *bdev, unsigned short nr_vecs,
unsigned int opf, gfp_t gfp_mask,
struct bio_set *bs);
-struct bio *bio_alloc_kiocb(struct kiocb *kiocb, unsigned short nr_vecs,
- struct bio_set *bs);
+struct bio *bio_alloc_kiocb(struct kiocb *kiocb, struct block_device *bdev,
+ unsigned short nr_vecs, unsigned int opf, struct bio_set *bs);
struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned short nr_iovecs);
extern void bio_put(struct bio *);
--
2.30.2
