Hi,
在 2023/11/20 18:45, Hannes Reinecke 写道:
On 11/20/23 10:38, Yu Kuai wrote:
From: Yu Kuai <yukuai3@xxxxxxxxxx>
There are multiple switches in struct block_device, use seperate bool
fields for them is not gracefully. Add a new field flags and replace
swithes to a bit, there are no functional changes, and preapre to add
a new switch in the next patch.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
block/bdev.c | 15 ++++++++-------
block/blk-core.c | 7 ++++---
block/genhd.c | 8 +++++---
block/ioctl.c | 2 +-
include/linux/blk_types.h | 12 ++++++------
include/linux/blkdev.h | 5 +++--
6 files changed, 27 insertions(+), 22 deletions(-)
diff --git a/block/bdev.c b/block/bdev.c
index fc8d28d77495..cb849bcf61ae 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -408,10 +408,10 @@ struct block_device *bdev_alloc(struct gendisk
*disk, u8 partno)
bdev->bd_partno = partno;
bdev->bd_inode = inode;
bdev->bd_queue = disk->queue;
- if (partno)
- bdev->bd_has_submit_bio = disk->part0->bd_has_submit_bio;
+ if (partno && test_bit(BD_FLAG_HAS_SUBMIT_BIO, &disk->part0->flags))
+ set_bit(BD_FLAG_HAS_SUBMIT_BIO, &bdev->flags);
else
- bdev->bd_has_submit_bio = false;
+ clear_bit(BD_FLAG_HAS_SUBMIT_BIO, &bdev->flags);
bdev->bd_stats = alloc_percpu(struct disk_stats);
if (!bdev->bd_stats) {
iput(inode);
Couldn't you achieve the very same result by using
'READ_ONCE()/WRITE_ONCE()' and keep the structure as-is?
Yes, remove this patch and add a new bool field in the next patch can
work as well, the idea here is replace multiple fields with a single
flag, and just use the flag in next patch. If people thinks add a new
bool field is better, I'll follow that.
Thanks,
Kuai
Cheers,
Hannes--
Dr. Hannes Reinecke Kernel Storage Architect
hare@xxxxxxx +49 911 74053 688
SUSE Software Solutions Germany GmbH, Frankenstr. 146, 90461 Nürnberg
Managing Directors: I. Totev, A. McDonald, W. Knoblich
(HRB 36809, AG Nürnberg)
.
