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bdev: move ->bd_has_subit_bio to ->__bd_flags

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In bdev_alloc() we have all flags initialized to false, so
assignment to ->bh_has_submit_bio n there is a no-op unless
we have partno != 0 and flag already set on entire device.

In device_add_disk() we have just allocated the block_device
in question and it had been a full-device one, so the flag
is guaranteed to be still clear when we get to assignment.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2024-04-12 01:21:45 -04:00
parent 4c80105e39
commit ac2b6f9dee
4 changed files with 7 additions and 8 deletions
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6
block/bdev.c
View file

@ -414,10 +414,8 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno)
atomic_set(&bdev->__bd_flags, partno);
bdev->bd_inode = inode;
bdev->bd_queue = disk->queue;
if (partno)
bdev->bd_has_submit_bio = disk->part0->bd_has_submit_bio;
else
bdev->bd_has_submit_bio = false;
if (partno && bdev_test_flag(disk->part0, BD_HAS_SUBMIT_BIO))
bdev_set_flag(bdev, BD_HAS_SUBMIT_BIO);
bdev->bd_stats = alloc_percpu(struct disk_stats);
if (!bdev->bd_stats) {
iput(inode);

4
block/blk-core.c
View file

@ -615,7 +615,7 @@ static void __submit_bio(struct bio *bio)
if (unlikely(!blk_crypto_bio_prep(&bio)))
return;
if (!bio->bi_bdev->bd_has_submit_bio) {
if (!bdev_test_flag(bio->bi_bdev, BD_HAS_SUBMIT_BIO)) {
blk_mq_submit_bio(bio);
} else if (likely(bio_queue_enter(bio) == 0)) {
struct gendisk *disk = bio->bi_bdev->bd_disk;
@ -723,7 +723,7 @@ void submit_bio_noacct_nocheck(struct bio *bio)
*/
if (current->bio_list)
bio_list_add(&current->bio_list[0], bio);
else if (!bio->bi_bdev->bd_has_submit_bio)
else if (!bdev_test_flag(bio->bi_bdev, BD_HAS_SUBMIT_BIO))
__submit_bio_noacct_mq(bio);
else
__submit_bio_noacct(bio);

3
block/genhd.c
View file

@ -413,7 +413,8 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
elevator_init_mq(disk->queue);
/* Mark bdev as having a submit_bio, if needed */
disk->part0->bd_has_submit_bio = disk->fops->submit_bio != NULL;
if (disk->fops->submit_bio)
bdev_set_flag(disk->part0, BD_HAS_SUBMIT_BIO);
/*
* If the driver provides an explicit major number it also must provide

2
include/linux/blk_types.h
View file

@ -49,7 +49,7 @@ struct block_device {
#define BD_PARTNO 255 // lower 8 bits; assign-once
#define BD_READ_ONLY (1u<<8) // read-only policy
#define BD_WRITE_HOLDER (1u<<9)
bool bd_has_submit_bio;
#define BD_HAS_SUBMIT_BIO (1u<<10)
dev_t bd_dev;
struct inode *bd_inode; /* will die */