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block: Do not reread partition table on exclusively open device 

Since commit 10c70d95c0 ("block: remove the bd_openers checks in
blk_drop_partitions") we allow rereading of partition table although
there are users of the block device. This has an undesirable consequence
that e.g. if sda and sdb are assembled to a RAID1 device md0 with
partitions, BLKRRPART ioctl on sda will rescan partition table and
create sda1 device. This partition device under a raid device confuses
some programs (such as libstorage-ng used for initial partitioning for
distribution installation) leading to failures.

Fix the problem refusing to rescan partitions if there is another user
that has the block device exclusively open.

Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20221130135344.2ul4cyfstfs3znxg@quack3
Fixes: 10c70d95c0 ("block: remove the bd_openers checks in blk_drop_partitions")
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20221130175653.24299-1-jack@suse.cz
[axboe: fold in followup fix]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jan Kara 2022-11-30 18:56:53 +01:00 committed by Jens Axboe
parent 92a34c4617
commit 36369f46e9
3 changed files with 13 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
block/blk.h
View File

@ -426,7 +426,7 @@ int bio_add_hw_page(struct request_queue *q, struct bio *bio,
struct request_queue *blk_alloc_queue(int node_id);
int disk_scan_partitions(struct gendisk *disk, fmode_t mode);
int disk_scan_partitions(struct gendisk *disk, fmode_t mode, void *owner);
int disk_alloc_events(struct gendisk *disk);
void disk_add_events(struct gendisk *disk);

7
block/genhd.c
View File

@ -356,7 +356,7 @@ void disk_uevent(struct gendisk *disk, enum kobject_action action)
}
EXPORT_SYMBOL_GPL(disk_uevent);
int disk_scan_partitions(struct gendisk *disk, fmode_t mode)
int disk_scan_partitions(struct gendisk *disk, fmode_t mode, void *owner)
{
struct block_device *bdev;
@ -366,6 +366,9 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode)
return -EINVAL;
if (disk->open_partitions)
return -EBUSY;
/* Someone else has bdev exclusively open? */
if (disk->part0->bd_holder && disk->part0->bd_holder != owner)
return -EBUSY;
set_bit(GD_NEED_PART_SCAN, &disk->state);
bdev = blkdev_get_by_dev(disk_devt(disk), mode, NULL);
@ -495,7 +498,7 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
bdev_add(disk->part0, ddev->devt);
if (get_capacity(disk))
disk_scan_partitions(disk, FMODE_READ);
disk_scan_partitions(disk, FMODE_READ, NULL);
/*
* Announce the disk and partitions after all partitions are

12
block/ioctl.c
View File

@ -467,9 +467,10 @@ static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
* user space. Note the separate arg/argp parameters that are needed
* to deal with the compat_ptr() conversion.
*/
static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
unsigned cmd, unsigned long arg, void __user *argp)
static int blkdev_common_ioctl(struct file *file, fmode_t mode, unsigned cmd,
unsigned long arg, void __user *argp)
{
struct block_device *bdev = I_BDEV(file->f_mapping->host);
unsigned int max_sectors;
switch (cmd) {
@ -527,7 +528,8 @@ 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 & ~FMODE_EXCL,
file);
case BLKTRACESTART:
case BLKTRACESTOP:
case BLKTRACETEARDOWN:
@ -605,7 +607,7 @@ long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
break;
}
ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
ret = blkdev_common_ioctl(file, mode, cmd, arg, argp);
if (ret != -ENOIOCTLCMD)
return ret;
@ -674,7 +676,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
break;
}
ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
ret = blkdev_common_ioctl(file, mode, cmd, arg, argp);
if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);