[PATCH 04/11] block: add a new set_read_only method
From: Christoph Hellwig <hch@lst.de>
Date: 2020-10-31 09:09:24
Also in:
ceph-devel, linux-bcache, linux-block, linux-s390
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
Add a new method to allow driver-specific callout when setting or clearing the block device read-only state. This allow to replace the cumbersome and error prone override of the whole ioctl implementation. Signed-off-by: Christoph Hellwig <hch@lst.de> --- block/ioctl.c | 5 +++++ include/linux/blkdev.h | 1 + 2 files changed, 6 insertions(+)
diff --git a/block/ioctl.c b/block/ioctl.c
index c6d8863f040945..a6fa16b9770593 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c@@ -389,6 +389,11 @@ 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; }
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 639cae2c158b59..5c1ba8a8d2bc7e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h@@ -1850,6 +1850,7 @@ 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); int (*report_zones)(struct gendisk *, sector_t sector,
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2.28.0