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block: add a new set_read_only method

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[ Upstream commit e00adcadf3af7a8335026d71ab9f0e0a922191ac ]

Add a new method to allow for driver-specific processing when setting or
clearing the block device read-only state.  This allows to replace the
cumbersome and error-prone override of the whole ioctl implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Stable-dep-of: 9674f54e41ff ("md: Don't clear MD_CLOSING when the raid is about to stop")
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit f28658bc8a7faa03578dc2588b5b3b56b09575a6)
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
This commit is contained in:
Christoph Hellwig 2020-11-03 11:00:11 +01:00 committed by Harshit Mogalapalli
parent 644ef6ff14
commit 5621bcf7c7
2 changed files with 6 additions and 0 deletions
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5
block/ioctl.c
View File

@ -444,6 +444,11 @@ static int blkdev_roset(struct block_device *bdev, fmode_t mode,
return -EACCES;
if (get_user(n, (int __user *)arg))
return -EFAULT;
if (bdev->bd_disk->fops->set_read_only) {
ret = bdev->bd_disk->fops->set_read_only(bdev, n);
if (ret)
return ret;
}
set_device_ro(bdev, n);
return 0;
}

1
include/linux/blkdev.h
View File

@ -1988,6 +1988,7 @@ struct block_device_operations {
void (*unlock_native_capacity) (struct gendisk *);
int (*revalidate_disk) (struct gendisk *);
int (*getgeo)(struct block_device *, struct hd_geometry *);
int (*set_read_only)(struct block_device *bdev, bool ro);
/* this callback is with swap_lock and sometimes page table lock held */
void (*swap_slot_free_notify) (struct block_device *, unsigned long);
struct module *owner;