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SubjectLVM snapshot broke between 4.14 and 4.16
(I originally reported this problem here:

When I updated from 4.14 to 4.16, my LVM snapshotting script broke for
no apparent reason.

My script has the following line, and it fails like this:
+ lvcreate --size 5G --snapshot --name snap0 --permission r
  device-mapper: create ioctl on
failed: Device or resource busy
  Failed to lock logical volume vg0/lvol_rootfs.
  Aborting. Manual intervention required.

At the same time, some errors appear in dmesg as well:
[   26.145279] generic_make_request: Trying to write to read-only
block-device dm-3 (partno 0)
[   26.145288] device-mapper: persistent snapshot: write_header failed
[   26.145847] device-mapper: table: 253:4: snapshot: Failed to read
snapshot metadata
[   26.145851] device-mapper: ioctl: error adding target to table

I bisected the vanilla kernel, and the first bad commit is
[721c7fc701c71f693307d274d2b346a1ecd4a534] block: fail op_is_write()
requests to read-only partitions

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