svn commit: r46547 - head/en_US.ISO8859-1/htdocs/news/status
Benjamin Kaduk <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.cvs.doc |
|---|---|
| Message-ID | <[email protected]> |
Author: bjk
Date: Tue Apr 14 23:31:28 2015
New Revision: 46547
URL: https://svnweb.freebsd.org/changeset/doc/46547
Log:
Add report on nanosecond file timestamps
Approved by: hrs (mentor, implicit)
Modified:
head/en_US.ISO8859-1/htdocs/news/status/report-2015-01-2015-03.xml
Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2015-01-2015-03.xml
==============================================================================
--- head/en_US.ISO8859-1/htdocs/news/status/report-2015-01-2015-03.xml Tue Apr 14 23:26:24 2015 (r46546)
+++ head/en_US.ISO8859-1/htdocs/news/status/report-2015-01-2015-03.xml Tue Apr 14 23:31:28 2015 (r46547)
@@ -1475,4 +1475,56 @@ WITHOUT_FORTH=y</pre>
</task>
</help>
</project>
+
+ <project cat='kern'>
+ <title>Nanosecond file timestamps</title>
+
+ <contact>
+ <person>
+ <name>
+ <given>Jilles</given>
+ <common>Tjoelker</common>
+ </name>
+ <email>[email protected]</email>
+ </person>
+
+ <person>
+ <name>
+ <given>Sergey</given>
+ <common>Kandaurov</common>
+ </name>
+ <email>[email protected]</email>
+ </person>
+ </contact>
+
+ <body>
+ <p>Two new system calls, futimens() and utimensat(), were
+ added, making it possible to set file timestamps with nanosecond
+ accuracy. Various utilities like cp, mv and touch were changed
+ to use the new calls to preserve and set timestamps with
+ full precision.</p>
+
+ <p>The stat() and related system calls have returned file
+ timestamps with nanosecond accuracy for a long time, but there
+ was no way to set a timestamp more accurately than
+ microseconds.</p>
+
+ <p>With these changes, it will be possible to use more
+ accurate timestamps (sysctl vfs.timestamp_precision=3) without
+ anomalies such as a copy of a file (from cp -p) appearing older
+ than the original. This is particularly useful for NFS servers,
+ which use file timestamps for cache invalidation.</p>
+ </body>
+
+ <help>
+ <task>
+ <p>Where possible, fix code that still sets inaccurate
+ timestamps on files, typically by calling futimes(),
+ futimesat(), lutimes(), utime() or utimes() with a non-null
+ times pointer. There may be a reason for this such as a limited
+ network protocol or file format, but there is some code left
+ that can be fixed.</p>
+ </task>
+ </help>
+ </project>
</report>
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