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block: fix bdev_disk_changed for non-partitioned devices 

We still have to set the capacity to 0 if invalidating or call
revalidate_disk if not even if the disk has no partitions.  Fix
that by merging rescan_partitions into bdev_disk_changed and just
stubbing out blk_add_partitions and blk_drop_partitions for
non-partitioned devices.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
alistair/sunxi64-5.5-dsi
Christoph Hellwig 2019-11-14 15:34:35 +01:00 committed by Jens Axboe
parent a1548b6744
commit 142fe8f4bb
4 changed files with 15 additions and 22 deletions
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6
block/ioctl.c
View File

@ -162,16 +162,14 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
*/
int __blkdev_reread_part(struct block_device *bdev)
{
struct gendisk *disk = bdev->bd_disk;
if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
lockdep_assert_held(&bdev->bd_mutex);
return rescan_partitions(disk, bdev, false);
return bdev_disk_changed(bdev, false);
}
EXPORT_SYMBOL(__blkdev_reread_part);

5
block/partition-generic.c
View File

@ -445,6 +445,8 @@ int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev)
struct hd_struct *part;
int res;
if (!disk_part_scan_enabled(disk))
return 0;
if (bdev->bd_part_count || bdev->bd_super)
return -EBUSY;
res = invalidate_partition(disk, 0);
@ -514,6 +516,9 @@ int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
struct parsed_partitions *state;
int ret = -EAGAIN, p, highest;
if (!disk_part_scan_enabled(disk))
return 0;
state = check_partition(disk, bdev);
if (!state)
return 0;

25
fs/block_dev.c
View File

@ -1508,9 +1508,9 @@ EXPORT_SYMBOL(bd_set_size);
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
static int rescan_partitions(struct gendisk *disk, struct block_device *bdev,
bool invalidate)
int bdev_disk_changed(struct block_device *bdev, bool invalidate)
{
struct gendisk *disk = bdev->bd_disk;
int ret;
rescan:
@ -1526,32 +1526,21 @@ rescan:
check_disk_size_change(disk, bdev, !invalidate);
bdev->bd_invalidated = 0;
if (!get_capacity(disk)) {
if (get_capacity(disk)) {
ret = blk_add_partitions(disk, bdev);
if (ret == -EAGAIN)
goto rescan;
} else {
/*
* Tell userspace that the media / partition table may have
* changed.
*/
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
return 0;
}
ret = blk_add_partitions(disk, bdev);
if (ret == -EAGAIN)
goto rescan;
return ret;
}
static void bdev_disk_changed(struct block_device *bdev, bool invalidate)
{
if (disk_part_scan_enabled(bdev->bd_disk)) {
rescan_partitions(bdev->bd_disk, bdev, invalidate);
} else {
check_disk_size_change(bdev->bd_disk, bdev, !invalidate);
bdev->bd_invalidated = 0;
}
}
/*
* bd_mutex locking:
*

1
include/linux/genhd.h
View File

@ -621,6 +621,7 @@ extern void blk_invalidate_devt(dev_t devt);
extern dev_t blk_lookup_devt(const char *name, int partno);
extern char *disk_name (struct gendisk *hd, int partno, char *buf);
int bdev_disk_changed(struct block_device *bdev, bool invalidate);
int blk_add_partitions(struct gendisk *disk, struct block_device *bdev);
int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev);
extern int disk_expand_part_tbl(struct gendisk *disk, int target);