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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>
This commit is contained in:
Christoph Hellwig
2020-11-03 11:00:11 +01:00
committed by Sasha Levin
parent dc51c01a3d
commit f28658bc8a
2 changed files with 6 additions and 0 deletions
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5
block/ioctl.c
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@@ -451,6 +451,11 @@ static int blkdev_roset(struct block_device *bdev, fmode_t mode,
return ret;
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;
}