Date: Thu, 22 Jan 2015 14:27:42 +0100 From: "Ronald Klop" <ronald-lists@klop.ws> To: freebsd-stable@freebsd.org Subject: mmap on tmpfs not updating mtime Message-ID: <op.xsu80gb9kndu52@ronaldradial.radialsg.local>
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Hello, Tested on 10.1-STABLE/amd64 and 11-CURRENT/arm. I spotted this because rrdtool didn't update mtime of the database files so they were not backuped by my rsync scripts. I remembered and found these mails from November 2014 about mtime+mmap on ZFS. https://lists.freebsd.org/pipermail/freebsd-stable/2014-November/081138.html which resulted in https://lists.freebsd.org/pipermail/freebsd-stable/2014-December/081184.html My tests with the test program in the November mails result in: On 10.1-STABLE/ZFS its OK: $ 14:18:08 ronald@sjakie [~/test] ls -lT mdata; /tmp/a.out mdata; ls -lT mdata -rw------- 1 ronald staff 1024 Jan 22 14:18:08 2015 mdata -rw------- 1 ronald staff 1024 Jan 22 14:18:10 2015 mdata On 11/UFS its OK: $ 14:16:16 ronald@sheeva [~/test] ls -lT mdata; /tmp/a.out mdata; ls -lT mdata -rw------- 1 ronald staff 1024 Jan 22 14:16:16 2015 mdata -rw------- 1 ronald staff 1024 Jan 22 14:16:21 2015 mdata On 11/tmpfs it fails: (same on 10.1-STABLE/tmpfs) $ 14:15:44 ronald@sheeva [/tmp] ls -lT mdata; /tmp/a.out mdata; ls -lT mdata -rw------- 1 ronald wheel 1024 Jan 22 14:15:37 2015 mdata -rw------- 1 ronald wheel 1024 Jan 22 14:15:37 2015 mdata Should a similar patch as ZFS got be applied to tmpfs? Regards, Ronald.
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