GNU bug report logs - #18499
Possible mv race for hardlinks (rhbz #1141368 )

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From: Pádraig Brady <P <at> draigBrady.com>
To: Boris Ranto <branto <at> redhat.com>
Cc: Paul Eggert <eggert <at> cs.ucla.edu>, 18499 <at> debbugs.gnu.org, ovasik <at> redhat.com, Miklos Szeredi <miklos <at> szeredi.hu>
Subject: bug#18499: Possible mv race for hardlinks (rhbz #1141368 )
Date: Sat, 22 Nov 2014 03:49:33 +0000

[Message part 1 (text/plain, inline)]

I just realised that this change avoids a more problematic issue.
The loss of files on case insensitive file systems supporting hardlinks.
Consider hfs...

  $ truncate -s1G hfs.img
  $ mkfs.hfsplus hfs.img
  $ mkdir hfs
  $ sudo mount hfs.img hfs
  $ sudo su
  # cd hfs
  # touch foo
  # ln foo blah
  # mv foo Foo  # foo is removed!
  # ls -l
  -rw-r--r--. 1 root root 0 Nov 22 02:42 blah

In the attached patch I've added a test case,
removed an old test case that pondered the issue in 5.0.91?,
updated NEWS and mentioned the issue in copy.c

cheers,
Pádraig.

[mv-hardlink-hfs.patch (text/x-patch, attachment)]

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