diff options
| author | Jan Kara <jack@suse.cz> | 2022-11-30 18:56:53 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-04 11:29:01 +0100 |
| commit | a35b4bcb43895c6e57e09bdad1cf3191cb67c63c (patch) | |
| tree | 64dc62d4e1364ccf89802d621bc5a2a21204ce2d /block/genhd.c | |
| parent | 01bb485730691ccb6e938be22cdf67fc2cd05406 (diff) | |
| download | linux-a35b4bcb43895c6e57e09bdad1cf3191cb67c63c.tar.gz | |
block: Do not reread partition table on exclusively open device
commit 36369f46e91785688a5f39d7a5590e3f07981316 upstream.
Since commit 10c70d95c0f2 ("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: 10c70d95c0f2 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block/genhd.c')
| -rw-r--r-- | block/genhd.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/block/genhd.c b/block/genhd.c index 647f7d8d8831..c4765681a8b4 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -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); @@ -500,7 +503,7 @@ 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 |