The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
Possible dependencies:
36369f46e917 ("block: Do not reread partition table on exclusively open device")
704b914f15fb ("blk-mq: move srcu from blk_mq_hw_ctx to request_queue")
2a904d00855f ("blk-mq: remove hctx_lock and hctx_unlock")
1e9c23034d7b ("blk-mq: move more plug handling from blk_mq_submit_bio into blk_add_rq_to_plug")
0c5bcc92d94a ("blk-mq: simplify the plug handling in blk_mq_submit_bio")
e16e506ccd67 ("block: merge disk_scan_partitions and blkdev_reread_part")
95febeb61bf8 ("block: fix missing queue put in error path")
b637108a4022 ("blk-mq: fix filesystem I/O request allocation")
b131f2011115 ("blk-mq: rename blk_attempt_bio_merge")
9ef4d0209cba ("blk-mq: add one API for waiting until quiesce is done")
900e08075202 ("block: move queue enter logic into blk_mq_submit_bio()")
c98cb5bbdab1 ("block: make bio_queue_enter() fast-path available inline")
71539717c105 ("block: split request allocation components into helpers")
a1cb65377e70 ("blk-mq: only try to run plug merge if request has same queue with incoming bio")
781dd830ec4f ("block: move RQF_ELV setting into allocators")
a2247f19ee1c ("block: Add independent access ranges support")
e94f68527a35 ("block: kill extra rcu lock/unlock in queue enter")
179ae84f7ef5 ("block: clean up blk_mq_submit_bio() merging")
a214b949d8e3 ("blk-mq: only flush requests from the plug in blk_mq_submit_bio")
1497a51a3287 ("block: don't bloat enter_queue with percpu_ref")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 36369f46e91785688a5f39d7a5590e3f07981316 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@xxxxxxx>
Date: Wed, 30 Nov 2022 18:56:53 +0100
Subject: [PATCH] block: Do not reread partition table on exclusively open
device
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@xxxxxxxxxxxxxxx
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@xxxxxxx>
Link: https://lore.kernel.org/r/20221130175653.24299-1-jack@xxxxxxx
[axboe: fold in followup fix]
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
diff --git a/block/blk.h b/block/blk.h
index a8ac9803fcb3..8900001946c7 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -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);
diff --git a/block/genhd.c b/block/genhd.c
index 075d8da284f5..52d71a94a809 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);
@@ -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
diff --git a/block/ioctl.c b/block/ioctl.c
index 60121e89052b..96617512982e 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -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);
