Re: [PATCH] vfs: allow copy_file_range from a swapfile

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On Mon, Jun 10, 2019 at 08:29:26PM -0700, Darrick J. Wong wrote:
> ...and administrators often mkfs over mounted filesystems because we let
> them read and write block devices.  Granted I tried to fix that once and
> LVM totally stopped working...

That must have been a long time ago.  We now overload O_EXCL on
blockdevice to only allow a single exclusive openers, and mounted
filesystems as well as raid drivers have been setting set for at leat
10 years.



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