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block: fix scan partition for exclusively open device again 

As explained in commit 36369f46e9 ("block: Do not reread partition table
on exclusively open device"), reread partition on the device that is
exclusively opened by someone else is problematic.

This patch will make sure partition scan will only be proceed if current
thread open the device exclusively, or the device is not opened
exclusively, and in the later case, other scanners and exclusive openers
will be blocked temporarily until partition scan is done.

Fixes: 10c70d95c0 ("block: remove the bd_openers checks in blk_drop_partitions")
Cc: <stable@vger.kernel.org>
Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230217022200.3092987-3-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2023-02-17 10:22:00 +08:00 committed by Jens Axboe
parent 0f77b29ad1
commit e5cfefa97b
2 changed files with 27 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
block/genhd.c
View File

@ -359,6 +359,7 @@ EXPORT_SYMBOL_GPL(disk_uevent);
int disk_scan_partitions(struct gendisk *disk, fmode_t mode)
{
struct block_device *bdev;
int ret = 0;
if (disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN))
return -EINVAL;
@ -368,11 +369,27 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode)
return -EBUSY;
set_bit(GD_NEED_PART_SCAN, &disk->state);
bdev = blkdev_get_by_dev(disk_devt(disk), mode, NULL);
/*
* If the device is opened exclusively by current thread already, it's
* safe to scan partitons, otherwise, use bd_prepare_to_claim() to
* synchronize with other exclusive openers and other partition
* scanners.
*/
if (!(mode & FMODE_EXCL)) {
ret = bd_prepare_to_claim(disk->part0, disk_scan_partitions);
if (ret)
return ret;
}
bdev = blkdev_get_by_dev(disk_devt(disk), mode & ~FMODE_EXCL, NULL);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
blkdev_put(bdev, mode);
return 0;
ret = PTR_ERR(bdev);
else
blkdev_put(bdev, mode);
if (!(mode & FMODE_EXCL))
bd_abort_claiming(disk->part0, disk_scan_partitions);
return ret;
}
/**
@ -494,6 +511,11 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
if (ret)
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))
set_bit(GD_NEED_PART_SCAN, &disk->state);
bdev_add(disk->part0, ddev->devt);
if (get_capacity(disk))
disk_scan_partitions(disk, FMODE_READ);

2
block/ioctl.c
View File

@ -528,7 +528,7 @@ static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
return -EACCES;
if (bdev_is_partition(bdev))
return -EINVAL;
return disk_scan_partitions(bdev->bd_disk, mode & ~FMODE_EXCL);
return disk_scan_partitions(bdev->bd_disk, mode);
case BLKTRACESTART:
case BLKTRACESTOP:
case BLKTRACETEARDOWN: