Re: [PATCH 02/18] xstat: Add a pair of system calls to make
extended file stats available [ver #6]
[Posted July 26, 2010 by corbet]
| From: |
| tridge-eUNUBHrolfbYtjvyW6yDsg-AT-public.gmane.org |
| To: |
| Ted Ts'o <tytso-3s7WtUTddSA-AT-public.gmane.org> |
| Subject: |
| Re: [PATCH 02/18] xstat: Add a pair of system calls to make
extended file stats available [ver #6] |
| Date: |
| Fri, 23 Jul 2010 12:12:47 +1000 |
| Message-ID: |
| <19528.64159.999224.437890@samba.org> |
| Cc: |
| Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b-AT-public.gmane.org>,
Jeremy Allison <jra-eUNUBHrolfbYtjvyW6yDsg-AT-public.gmane.org>, linux-cifs-u79uwXL29TY76Z2rM5mHXA-AT-public.gmane.org,
linux-nfs-u79uwXL29TY76Z2rM5mHXA-AT-public.gmane.org, Volker.Lendecke-3ekOc4rQMZmzQB+pC5nmwQ-AT-public.gmane.org,
samba-technical-w/Ol4Ecudpl8XjKLYN78aQ-AT-public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA-AT-public.gmane.org,
Jan Engelhardt <jengelh-nopoi9nDyk+ELgA04lAiVw-AT-public.gmane.org>,
David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA-AT-public.gmane.org>, viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn-AT-public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA-AT-public.gmane.org, linux-ext4-u79uwXL29TY76Z2rM5mHXA-AT-public.gmane.org |
| Archive‑link: | |
Article |
Hi Ted,
> Does it literally mean "file creation time" in terms of when the OS
> created the file, or does it mean "file" in the sense of
> application contents. For example, if an application edits the
> file and saves it out using "write file to foo.new; sync; rename
> foo to foo.bak; rename foo.new to foo", should the creation time
> for the newly written file "foo" be the time when the editor saved
> out the file (i.e., when "foo.new" was created), or copied from the
> original file "foo"'s creation time.
In Windows this is can be controlled by applications, but it also is
done at the filesystem level in NTFS using a technique that Microsoft
call "File System Tunneling". If you create a file with the same name
within a short time (default 15s and settable in the registry) of when
the file previously existed then it will get the same CreationTime as
the previous file.
For details see http://support.microsoft.com/kb/172190
Some applications also do this regardless of the registry setting for
MaximumTunnelEntryAgeInSeconds. They use the ability to set the
CreationTime to get the same behaviour.
Cheers, Tridge
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