Commit 092b90d2 authored by Li Lingfeng's avatar Li Lingfeng
Browse files

block: Show info about opening a lower device for write while upper-layers mounted 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8S3GW


CVE: NA

---------------------------

Filesystem on logic devices may be corrupted when writing to a block
device which is used to create logic devices, so show info to indicate
this risk behavior.

Signed-off-by: default avatarLi Lingfeng <lilingfeng3@huawei.com>
parent d96acf38

block/bdev.c

+19 −0
Original line number Diff line number Diff line
@@ -818,6 +818,22 @@ static void bdev_unblock_mount(struct block_device *bdev) 
		bdev->bd_disk->write_open_partitions--;

}



static void bdev_write_exclusive_dump(struct block_device *bdev, void *holder,

				      const struct blk_holder_ops *hops)

{

	bool may_claim;



	if (!bdev_write_mounted_opt(WRITE_MOUNTED_DUMP))

		return;



	mutex_lock(&bdev_lock);

	may_claim = bd_may_claim(bdev, holder, hops);

	mutex_unlock(&bdev_lock);



	if (!may_claim)

		blkdev_dump_conflict_opener(bdev, OPEN_EXCLUSIVE);

}



static bool bdev_may_open(struct block_device *bdev, blk_mode_t mode)

{

	if (bdev_write_mounted_opt(ALLOW_WRITE_MOUNTED) &&
@@ -919,6 +935,9 @@ struct bdev_handle *bdev_open_by_dev(dev_t dev, blk_mode_t mode, void *holder, 


	disk_block_events(disk);



	if (mode & BLK_OPEN_WRITE)

		bdev_write_exclusive_dump(bdev, holder, hops);



	mutex_lock(&disk->open_mutex);

	ret = -ENXIO;

	if (!disk_live(disk))