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block: add a disk_has_partscan helper 

Add a helper to check if partition scanning is enabled instead of
open coding the check in a few places.  This now always checks for
the hidden flag even if all but one of the callers are never reachable
for hidden gendisks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240502130033.1958492-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-05-02 15:00:32 +02:00 committed by Jens Axboe
parent d0487577e6
commit 140ce28dd3
3 changed files with 16 additions and 9 deletions
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7
block/genhd.c
View File

@ -345,9 +345,7 @@ int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode)
struct file *file;
int ret = 0;
if (disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN))
return -EINVAL;
if (test_bit(GD_SUPPRESS_PART_SCAN, &disk->state))
if (!disk_has_partscan(disk))
return -EINVAL;
if (disk->open_partitions)
return -EBUSY;
@ -503,8 +501,7 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
goto out_unregister_bdi;
/* Make sure the first partition scan will be proceed */
if (get_capacity(disk) && !(disk->flags & GENHD_FL_NO_PART) &&
!test_bit(GD_SUPPRESS_PART_SCAN, &disk->state))
if (get_capacity(disk) && disk_has_partscan(disk))
set_bit(GD_NEED_PART_SCAN, &disk->state);
bdev_add(disk->part0, ddev->devt);

5
block/partitions/core.c
View File

@ -573,10 +573,7 @@ static int blk_add_partitions(struct gendisk *disk)
struct parsed_partitions *state;
int ret = -EAGAIN, p;
if (disk->flags & GENHD_FL_NO_PART)
return 0;
if (test_bit(GD_SUPPRESS_PART_SCAN, &disk->state))
if (!disk_has_partscan(disk))
return 0;
state = check_partition(disk);

13
include/linux/blkdev.h
View File

@ -230,6 +230,19 @@ static inline unsigned int disk_openers(struct gendisk *disk)
return atomic_read(&disk->part0->bd_openers);
}
/**
* disk_has_partscan - return %true if partition scanning is enabled on a disk
* @disk: disk to check
*
* Returns %true if partitions scanning is enabled for @disk, or %false if
* partition scanning is disabled either permanently or temporarily.
*/
static inline bool disk_has_partscan(struct gendisk *disk)
{
return !(disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) &&
!test_bit(GD_SUPPRESS_PART_SCAN, &disk->state);
}
/*
* The gendisk is refcounted by the part0 block_device, and the bd_device
* therein is also used for device model presentation in sysfs.