@@ -417,8 +417,10 @@ static void punt_bios_to_rescuer(struct bio_set *bs)
/**
* bio_alloc_bioset - allocate a bio for I/O
+ * @bdev: block device to allocate the bio for (can be %NULL)
+ * @nr_vecs: number of bvecs to pre-allocate
+ * @opf: operation and flags for bio
* @gfp_mask: the GFP_* mask given to the slab allocator
- * @nr_iovecs: number of iovecs to pre-allocate
* @bs: the bio_set to allocate from.
*
* Allocate a bio from the mempools in @bs.
@@ -447,15 +449,16 @@ static void punt_bios_to_rescuer(struct bio_set *bs)
*
* Returns: Pointer to new bio on success, NULL on failure.
*/
-struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned short nr_iovecs,
+struct bio *bio_alloc_bioset(struct block_device *bdev, unsigned short nr_vecs,
+ unsigned int opf, gfp_t gfp_mask,
struct bio_set *bs)
{
gfp_t saved_gfp = gfp_mask;
struct bio *bio;
void *p;
- /* should not use nobvec bioset for nr_iovecs > 0 */
- if (WARN_ON_ONCE(!mempool_initialized(&bs->bvec_pool) && nr_iovecs > 0))
+ /* should not use nobvec bioset for nr_vecs > 0 */
+ if (WARN_ON_ONCE(!mempool_initialized(&bs->bvec_pool) && nr_vecs > 0))
return NULL;
/*
@@ -492,26 +495,29 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned short nr_iovecs,
return NULL;
bio = p + bs->front_pad;
- if (nr_iovecs > BIO_INLINE_VECS) {
+ if (nr_vecs > BIO_INLINE_VECS) {
struct bio_vec *bvl = NULL;
- bvl = bvec_alloc(&bs->bvec_pool, &nr_iovecs, gfp_mask);
+ bvl = bvec_alloc(&bs->bvec_pool, &nr_vecs, gfp_mask);
if (!bvl && gfp_mask != saved_gfp) {
punt_bios_to_rescuer(bs);
gfp_mask = saved_gfp;
- bvl = bvec_alloc(&bs->bvec_pool, &nr_iovecs, gfp_mask);
+ bvl = bvec_alloc(&bs->bvec_pool, &nr_vecs, gfp_mask);
}
if (unlikely(!bvl))
goto err_free;
- bio_init(bio, bvl, nr_iovecs);
- } else if (nr_iovecs) {
+ bio_init(bio, bvl, nr_vecs);
+ } else if (nr_vecs) {
bio_init(bio, bio->bi_inline_vecs, BIO_INLINE_VECS);
} else {
bio_init(bio, NULL, 0);
}
bio->bi_pool = bs;
+ if (bdev)
+ bio_set_dev(bio, bdev);
+ bio->bi_opf = opf;
return bio;
err_free:
@@ -767,7 +773,7 @@ struct bio *bio_clone_fast(struct bio *bio, gfp_t gfp_mask, struct bio_set *bs)
{
struct bio *b;
- b = bio_alloc_bioset(gfp_mask, 0, bs);
+ b = bio_alloc_bioset(NULL, 0, 0, gfp_mask, bs);
if (!b)
return NULL;
@@ -1743,7 +1749,7 @@ struct bio *bio_alloc_kiocb(struct kiocb *kiocb, unsigned short nr_vecs,
struct bio *bio;
if (!(kiocb->ki_flags & IOCB_ALLOC_CACHE) || nr_vecs > BIO_INLINE_VECS)
- return bio_alloc_bioset(GFP_KERNEL, nr_vecs, bs);
+ return bio_alloc_bioset(NULL, nr_vecs, 0, GFP_KERNEL, bs);
cache = per_cpu_ptr(bs->cache, get_cpu());
if (cache->free_list) {
@@ -1757,7 +1763,7 @@ struct bio *bio_alloc_kiocb(struct kiocb *kiocb, unsigned short nr_vecs,
return bio;
}
put_cpu();
- bio = bio_alloc_bioset(GFP_KERNEL, nr_vecs, bs);
+ bio = bio_alloc_bioset(NULL, nr_vecs, 0, GFP_KERNEL, bs);
bio_set_flag(bio, BIO_PERCPU_CACHE);
return bio;
}
@@ -165,12 +165,10 @@ static struct bio *bounce_clone_bio(struct bio *bio_src)
* asking for trouble and would force extra work on
* __bio_clone_fast() anyways.
*/
- bio = bio_alloc_bioset(GFP_NOIO, bio_segments(bio_src),
- &bounce_bio_set);
- bio->bi_bdev = bio_src->bi_bdev;
+ bio = bio_alloc_bioset(bio_src->bi_bdev, bio_segments(bio_src),
+ bio_src->bi_opf, GFP_NOIO, &bounce_bio_set);
if (bio_flagged(bio_src, BIO_REMAPPED))
bio_set_flag(bio, BIO_REMAPPED);
- bio->bi_opf = bio_src->bi_opf;
bio->bi_ioprio = bio_src->bi_ioprio;
bio->bi_write_hint = bio_src->bi_write_hint;
bio->bi_iter.bi_sector = bio_src->bi_iter.bi_sector;
@@ -138,15 +138,14 @@ static int _drbd_md_sync_page_io(struct drbd_device *device,
op_flags |= REQ_FUA | REQ_PREFLUSH;
op_flags |= REQ_SYNC;
- bio = bio_alloc_bioset(GFP_NOIO, 1, &drbd_md_io_bio_set);
- bio_set_dev(bio, bdev->md_bdev);
+ bio = bio_alloc_bioset(bdev->md_bdev, 1, op | op_flags, GFP_NOIO,
+ &drbd_md_io_bio_set);
bio->bi_iter.bi_sector = sector;
err = -EIO;
if (bio_add_page(bio, device->md_io.page, size, 0) != size)
goto out;
bio->bi_private = device;
bio->bi_end_io = drbd_md_endio;
- bio_set_op_attrs(bio, op, op_flags);
if (op != REQ_OP_WRITE && device->state.disk == D_DISKLESS && device->ldev == NULL)
/* special case, drbd_md_read() during drbd_adm_attach(): no get_ldev */
@@ -976,12 +976,13 @@ static void drbd_bm_endio(struct bio *bio)
static void bm_page_io_async(struct drbd_bm_aio_ctx *ctx, int page_nr) __must_hold(local)
{
- struct bio *bio = bio_alloc_bioset(GFP_NOIO, 1, &drbd_md_io_bio_set);
struct drbd_device *device = ctx->device;
+ unsigned int op = (ctx->flags & BM_AIO_READ) ? REQ_OP_READ : REQ_OP_WRITE;
+ struct bio *bio = bio_alloc_bioset(device->ldev->md_bdev, 1, op,
+ GFP_NOIO, &drbd_md_io_bio_set);
struct drbd_bitmap *b = device->bitmap;
struct page *page;
unsigned int len;
- unsigned int op = (ctx->flags & BM_AIO_READ) ? REQ_OP_READ : REQ_OP_WRITE;
sector_t on_disk_sector =
device->ldev->md.md_offset + device->ldev->md.bm_offset;
@@ -1006,14 +1007,12 @@ static void bm_page_io_async(struct drbd_bm_aio_ctx *ctx, int page_nr) __must_ho
bm_store_page_idx(page, page_nr);
} else
page = b->bm_pages[page_nr];
- bio_set_dev(bio, device->ldev->md_bdev);
bio->bi_iter.bi_sector = on_disk_sector;
/* bio_add_page of a single page to an empty bio will always succeed,
* according to api. Do we want to assert that? */
bio_add_page(bio, page, len, 0);
bio->bi_private = ctx;
bio->bi_end_io = drbd_bm_endio;
- bio_set_op_attrs(bio, op, 0);
if (drbd_insert_fault(device, (op == REQ_OP_WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD)) {
bio_io_error(bio);
@@ -913,14 +913,13 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
/* btree_search_recurse()'s btree iterator is no good anymore */
ret = miss == bio ? MAP_DONE : -EINTR;
- cache_bio = bio_alloc_bioset(GFP_NOWAIT,
+ cache_bio = bio_alloc_bioset(miss->bi_bdev,
DIV_ROUND_UP(s->insert_bio_sectors, PAGE_SECTORS),
- &dc->disk.bio_split);
+ 0, GFP_NOWAIT, &dc->disk.bio_split);
if (!cache_bio)
goto out_submit;
cache_bio->bi_iter.bi_sector = miss->bi_iter.bi_sector;
- bio_copy_dev(cache_bio, miss);
cache_bio->bi_iter.bi_size = s->insert_bio_sectors << 9;
cache_bio->bi_end_io = backing_request_endio;
@@ -1025,16 +1024,15 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
*/
struct bio *flush;
- flush = bio_alloc_bioset(GFP_NOIO, 0,
- &dc->disk.bio_split);
+ flush = bio_alloc_bioset(bio->bi_bdev, 0,
+ REQ_OP_WRITE | REQ_PREFLUSH,
+ GFP_NOIO, &dc->disk.bio_split);
if (!flush) {
s->iop.status = BLK_STS_RESOURCE;
goto insert_data;
}
- bio_copy_dev(flush, bio);
flush->bi_end_io = backing_request_endio;
flush->bi_private = cl;
- flush->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
/* I/O request sent to backing device */
closure_bio_submit(s->iop.c, flush, cl);
}
@@ -1672,11 +1672,10 @@ static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
mutex_lock(&cc->bio_alloc_lock);
- clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, &cc->bs);
+ clone = bio_alloc_bioset(cc->dev->bdev, nr_iovecs, io->base_bio->bi_opf,
+ GFP_NOIO, &cc->bs);
clone->bi_private = io;
clone->bi_end_io = crypt_endio;
- bio_set_dev(clone, cc->dev->bdev);
- clone->bi_opf = io->base_bio->bi_opf;
remaining_size = size;
@@ -345,11 +345,10 @@ static void do_region(int op, int op_flags, unsigned region,
(PAGE_SIZE >> SECTOR_SHIFT)));
}
- bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, &io->client->bios);
+ bio = bio_alloc_bioset(where->bdev, num_bvecs, op | op_flags,
+ GFP_NOIO, &io->client->bios);
bio->bi_iter.bi_sector = where->sector + (where->count - remaining);
- bio_set_dev(bio, where->bdev);
bio->bi_end_io = endio;
- bio_set_op_attrs(bio, op, op_flags);
store_io_and_region_in_bio(bio, io, region);
if (op == REQ_OP_DISCARD || op == REQ_OP_WRITE_ZEROES) {
@@ -1821,11 +1821,11 @@ static void __writecache_writeback_pmem(struct dm_writecache *wc, struct writeba
max_pages = e->wc_list_contiguous;
- bio = bio_alloc_bioset(GFP_NOIO, max_pages, &wc->bio_set);
+ bio = bio_alloc_bioset(wc->dev->bdev, max_pages, REQ_OP_WRITE,
+ GFP_NOIO, &wc->bio_set);
wb = container_of(bio, struct writeback_struct, bio);
wb->wc = wc;
bio->bi_end_io = writecache_writeback_endio;
- bio_set_dev(bio, wc->dev->bdev);
bio->bi_iter.bi_sector = read_original_sector(wc, e);
if (max_pages <= WB_LIST_INLINE ||
unlikely(!(wb->wc_list = kmalloc_array(max_pages, sizeof(struct wc_entry *),
@@ -1852,7 +1852,8 @@ static void __writecache_writeback_pmem(struct dm_writecache *wc, struct writeba
wb->wc_list[wb->wc_list_n++] = f;
e = f;
}
- bio_set_op_attrs(bio, REQ_OP_WRITE, WC_MODE_FUA(wc) * REQ_FUA);
+ if (WC_MODE_FUA(wc))
+ bio->bi_opf |= REQ_FUA;
if (writecache_has_error(wc)) {
bio->bi_status = BLK_STS_IOERR;
bio_endio(bio);
@@ -519,7 +519,7 @@ static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
struct dm_target_io *tio;
struct bio *clone;
- clone = bio_alloc_bioset(GFP_NOIO, 0, &md->io_bs);
+ clone = bio_alloc_bioset(NULL, 0, 0, GFP_NOIO, &md->io_bs);
tio = container_of(clone, struct dm_target_io, clone);
tio->inside_dm_io = true;
@@ -552,7 +552,8 @@ static struct dm_target_io *alloc_tio(struct clone_info *ci, struct dm_target *t
/* the dm_target_io embedded in ci->io is available */
tio = &ci->io->tio;
} else {
- struct bio *clone = bio_alloc_bioset(gfp_mask, 0, &ci->io->md->bs);
+ struct bio *clone = bio_alloc_bioset(NULL, 0, 0, gfp_mask,
+ &ci->io->md->bs);
if (!clone)
return NULL;
@@ -562,11 +562,11 @@ static void submit_flushes(struct work_struct *ws)
atomic_inc(&rdev->nr_pending);
atomic_inc(&rdev->nr_pending);
rcu_read_unlock();
- bi = bio_alloc_bioset(GFP_NOIO, 0, &mddev->bio_set);
+ bi = bio_alloc_bioset(rdev->bdev, 0,
+ REQ_OP_WRITE | REQ_PREFLUSH,
+ GFP_NOIO, &mddev->bio_set);
bi->bi_end_io = md_end_flush;
bi->bi_private = rdev;
- bio_set_dev(bi, rdev->bdev);
- bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
atomic_inc(&mddev->flush_pending);
submit_bio(bi);
rcu_read_lock();
@@ -955,7 +955,6 @@ void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
* If an error occurred, call md_error
*/
struct bio *bio;
- int ff = 0;
if (!page)
return;
@@ -963,11 +962,13 @@ void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
if (test_bit(Faulty, &rdev->flags))
return;
- bio = bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
+ bio = bio_alloc_bioset(rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev,
+ 1,
+ REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA,
+ GFP_NOIO, &mddev->sync_set);
atomic_inc(&rdev->nr_pending);
- bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
bio->bi_iter.bi_sector = sector;
bio_add_page(bio, page, size, 0);
bio->bi_private = rdev;
@@ -976,8 +977,7 @@ void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
test_bit(FailFast, &rdev->flags) &&
!test_bit(LastDev, &rdev->flags))
- ff = MD_FAILFAST;
- bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
+ bio->bi_opf |= MD_FAILFAST;
atomic_inc(&mddev->pending_writes);
submit_bio(bio);
@@ -1126,7 +1126,8 @@ static void alloc_behind_master_bio(struct r1bio *r1_bio,
int i = 0;
struct bio *behind_bio = NULL;
- behind_bio = bio_alloc_bioset(GFP_NOIO, vcnt, &r1_bio->mddev->bio_set);
+ behind_bio = bio_alloc_bioset(NULL, vcnt, 0, GFP_NOIO,
+ &r1_bio->mddev->bio_set);
if (!behind_bio)
return;
@@ -4892,14 +4892,12 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
return sectors_done;
}
- read_bio = bio_alloc_bioset(GFP_KERNEL, RESYNC_PAGES, &mddev->bio_set);
-
- bio_set_dev(read_bio, rdev->bdev);
+ read_bio = bio_alloc_bioset(rdev->bdev, RESYNC_PAGES, REQ_OP_READ,
+ GFP_KERNEL, &mddev->bio_set);
read_bio->bi_iter.bi_sector = (r10_bio->devs[r10_bio->read_slot].addr
+ rdev->data_offset);
read_bio->bi_private = r10_bio;
read_bio->bi_end_io = end_reshape_read;
- bio_set_op_attrs(read_bio, REQ_OP_READ, 0);
r10_bio->master_bio = read_bio;
r10_bio->read_slot = r10_bio->devs[r10_bio->read_slot].devnum;
@@ -735,10 +735,9 @@ static void r5l_submit_current_io(struct r5l_log *log)
static struct bio *r5l_bio_alloc(struct r5l_log *log)
{
- struct bio *bio = bio_alloc_bioset(GFP_NOIO, BIO_MAX_VECS, &log->bs);
+ struct bio *bio = bio_alloc_bioset(log->rdev->bdev, BIO_MAX_VECS,
+ REQ_OP_WRITE, GFP_NOIO, &log->bs);
- bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
- bio_set_dev(bio, log->rdev->bdev);
bio->bi_iter.bi_sector = log->rdev->data_offset + log->log_start;
return bio;
@@ -1634,7 +1633,8 @@ static int r5l_recovery_allocate_ra_pool(struct r5l_log *log,
{
struct page *page;
- ctx->ra_bio = bio_alloc_bioset(GFP_KERNEL, BIO_MAX_VECS, &log->bs);
+ ctx->ra_bio = bio_alloc_bioset(NULL, BIO_MAX_VECS, 0, GFP_KERNEL,
+ &log->bs);
if (!ctx->ra_bio)
return -ENOMEM;
@@ -496,11 +496,10 @@ static void ppl_submit_iounit(struct ppl_io_unit *io)
if (!bio_add_page(bio, sh->ppl_page, PAGE_SIZE, 0)) {
struct bio *prev = bio;
- bio = bio_alloc_bioset(GFP_NOIO, BIO_MAX_VECS,
+ bio = bio_alloc_bioset(prev->bi_bdev, BIO_MAX_VECS,
+ prev->bi_opf, GFP_NOIO,
&ppl_conf->bs);
- bio->bi_opf = prev->bi_opf;
bio->bi_write_hint = prev->bi_write_hint;
- bio_copy_dev(bio, prev);
bio->bi_iter.bi_sector = bio_end_sector(prev);
bio_add_page(bio, sh->ppl_page, PAGE_SIZE, 0);
@@ -637,10 +636,10 @@ static void ppl_do_flush(struct ppl_io_unit *io)
struct bio *bio;
char b[BDEVNAME_SIZE];
- bio = bio_alloc_bioset(GFP_NOIO, 0, &ppl_conf->flush_bs);
- bio_set_dev(bio, bdev);
+ bio = bio_alloc_bioset(bdev, 0, GFP_NOIO,
+ REQ_OP_WRITE | REQ_PREFLUSH,
+ &ppl_conf->flush_bs);
bio->bi_private = io;
- bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
bio->bi_end_io = ppl_flush_endio;
pr_debug("%s: dev: %s\n", __func__,
@@ -353,18 +353,16 @@ static struct bio *iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num,
* Only allocate as many vector entries as the bio code allows us to,
* we'll loop later on until we have handled the whole request.
*/
- bio = bio_alloc_bioset(GFP_NOIO, bio_max_segs(sg_num),
- &ib_dev->ibd_bio_set);
+ bio = bio_alloc_bioset(ib_dev->ibd_bd, bio_max_segs(sg_num), opf,
+ GFP_NOIO, &ib_dev->ibd_bio_set);
if (!bio) {
pr_err("Unable to allocate memory for bio\n");
return NULL;
}
- bio_set_dev(bio, ib_dev->ibd_bd);
bio->bi_private = cmd;
bio->bi_end_io = &iblock_bio_done;
bio->bi_iter.bi_sector = lba;
- bio->bi_opf = opf;
return bio;
}
@@ -3143,7 +3143,7 @@ struct bio *btrfs_bio_alloc(unsigned int nr_iovecs)
struct bio *bio;
ASSERT(0 < nr_iovecs && nr_iovecs <= BIO_MAX_VECS);
- bio = bio_alloc_bioset(GFP_NOFS, nr_iovecs, &btrfs_bioset);
+ bio = bio_alloc_bioset(NULL, nr_iovecs, 0, GFP_NOFS, &btrfs_bioset);
btrfs_bio_init(btrfs_bio(bio));
return bio;
}
@@ -394,7 +394,7 @@ static struct bio *__bio_alloc(struct f2fs_io_info *fio, int npages)
struct f2fs_sb_info *sbi = fio->sbi;
struct bio *bio;
- bio = bio_alloc_bioset(GFP_NOIO, npages, &f2fs_bioset);
+ bio = bio_alloc_bioset(NULL, npages, 0, GFP_NOIO, &f2fs_bioset);
f2fs_target_device(sbi, fio->new_blkaddr, bio);
if (is_read_io(fio->op)) {
@@ -985,8 +985,8 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
struct bio_post_read_ctx *ctx = NULL;
unsigned int post_read_steps = 0;
- bio = bio_alloc_bioset(for_write ? GFP_NOIO : GFP_KERNEL,
- bio_max_segs(nr_pages), &f2fs_bioset);
+ bio = bio_alloc_bioset(NULL, bio_max_segs(nr_pages), REQ_OP_READ,
+ for_write ? GFP_NOIO : GFP_KERNEL, &f2fs_bioset);
if (!bio)
return ERR_PTR(-ENOMEM);
@@ -994,7 +994,6 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
f2fs_target_device(sbi, blkaddr, bio);
bio->bi_end_io = f2fs_read_end_io;
- bio_set_op_attrs(bio, REQ_OP_READ, op_flag);
if (fscrypt_inode_uses_fs_layer_crypto(inode))
post_read_steps |= STEP_DECRYPT;
@@ -1196,10 +1196,10 @@ iomap_alloc_ioend(struct inode *inode, struct iomap_writepage_ctx *wpc,
struct iomap_ioend *ioend;
struct bio *bio;
- bio = bio_alloc_bioset(GFP_NOFS, BIO_MAX_VECS, &iomap_ioend_bioset);
- bio_set_dev(bio, wpc->iomap.bdev);
+ bio = bio_alloc_bioset(wpc->iomap.bdev, BIO_MAX_VECS,
+ REQ_OP_WRITE | wbc_to_write_flags(wbc),
+ GFP_NOFS, &iomap_ioend_bioset);
bio->bi_iter.bi_sector = sector;
- bio->bi_opf = REQ_OP_WRITE | wbc_to_write_flags(wbc);
bio->bi_write_hint = inode->i_write_hint;
wbc_init_bio(wbc, bio);
@@ -405,8 +405,9 @@ extern void bioset_exit(struct bio_set *);
extern int biovec_init_pool(mempool_t *pool, int pool_entries);
extern int bioset_init_from_src(struct bio_set *bs, struct bio_set *src);
-struct bio *bio_alloc_bioset(gfp_t gfp, unsigned short nr_iovecs,
- struct bio_set *bs);
+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_kmalloc(gfp_t gfp_mask, unsigned short nr_iovecs);
@@ -419,7 +420,7 @@ extern struct bio_set fs_bio_set;
static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned short nr_iovecs)
{
- return bio_alloc_bioset(gfp_mask, nr_iovecs, &fs_bio_set);
+ return bio_alloc_bioset(NULL, nr_iovecs, 0, gfp_mask, &fs_bio_set);
}
void submit_bio(struct bio *bio);