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Message-ID:	<55383264.5020205@gmail.com>
Date:	Thu, 23 Apr 2015 01:44:36 +0200
From:	David Macek <david DOT macek DOT 0 AT gmail DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Deleting files with open handles on subst'd drives
X-IsSubscribed:	yes

--------------ms050207000708000506010901
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

Hello everyone.

Some time ago, I encountered a problem in a script when run on Cygwin/MSYS2=
. To add some drama, I'll mention that the problem caused some data loss (n=
othing important though). The problem is that some operations on open files=
 seem to fail on subst'd drives (but not on regular ones).

To reproduce the problem, choose some writable directory and run:
$ subst X: C:/somesubdir
$ cd /cygdrive/x/
$ touch foo
$ { rm foo; touch foo; } <foo
touch: cannot touch 'foo': Permission denied

(Do not subst to just C:/, because that somehow doesn't lead to the error.)

There's also a C program that does essentially the same thing: <https://gis=
t.github.com/elieux/6463521192baed613099>

I compared this with the same operations running on a regular drive, but I =
couldn't find any difference in how `rm` deletes the file nor in how `touch=
` creates the file. Just the result of the last NtCreateFile is different (=
STATUS_SUCCESS vs. STATUS_DELETE_PENDING).

Thoughts?

--=20
David Macek


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