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block: don't set GD_NEED_PART_SCAN if scan partition failed 

[ Upstream commit 3723091ea1 ]

Currently if disk_scan_partitions() failed, GD_NEED_PART_SCAN will still
set, and partition scan will be proceed again when blkdev_get_by_dev()
is called. However, this will cause a problem that re-assemble partitioned
raid device will creat partition for underlying disk.

Test procedure:

mdadm -CR /dev/md0 -l 1 -n 2 /dev/sda /dev/sdb -e 1.0
sgdisk -n 0:0:+100MiB /dev/md0
blockdev --rereadpt /dev/sda
blockdev --rereadpt /dev/sdb
mdadm -S /dev/md0
mdadm -A /dev/md0 /dev/sda /dev/sdb

Test result: underlying disk partition and raid partition can be
observed at the same time

Note that this can still happen in come corner cases that
GD_NEED_PART_SCAN can be set for underlying disk while re-assemble raid
device.

Fixes: e5cfefa97b ("block: fix scan partition for exclusively open device again")
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yu Kuai 2023-03-22 11:59:26 +08:00 committed by Greg Kroah-Hartman
parent 9dbe85ac61
commit 12b3d75ca3
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
block/genhd.c
View File

@ -368,7 +368,6 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode)
if (disk->open_partitions)
return -EBUSY;
set_bit(GD_NEED_PART_SCAN, &disk->state);
/*
* If the device is opened exclusively by current thread already, it's
* safe to scan partitons, otherwise, use bd_prepare_to_claim() to
@ -381,12 +380,19 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode)
return ret;
}
set_bit(GD_NEED_PART_SCAN, &disk->state);
bdev = blkdev_get_by_dev(disk_devt(disk), mode & ~FMODE_EXCL, NULL);
if (IS_ERR(bdev))
ret = PTR_ERR(bdev);
else
blkdev_put(bdev, mode & ~FMODE_EXCL);
/*
* If blkdev_get_by_dev() failed early, GD_NEED_PART_SCAN is still set,
* and this will cause that re-assemble partitioned raid device will
* creat partition for underlying disk.
*/
clear_bit(GD_NEED_PART_SCAN, &disk->state);
if (!(mode & FMODE_EXCL))
bd_abort_claiming(disk->part0, disk_scan_partitions);
return ret;