Messages in this thread | | | Subject | Re: [PATCH] nanosecond filesystem support??? | From | Arjan van de Ven <> | Date | Tue, 13 Feb 2007 09:42:59 +0100 |
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On Tue, 2007-02-13 at 16:38 +0800, Jeff Chua wrote: > On 2/12/07, Andi Kleen <ak@suse.de> wrote: > > > The bigger problem is getting a file system that support it. > > > Andi, > > It seems that the part that's not returning nanosecond is in the code > below. I've modified it, and now stat() is returning st_mtim.tv_nsec > correctly. > > I've tested it on ext2 and reiserfs, and both seems to be working. > > > I don't know why "t.tv_nsec = 0;" was set in the code. Any idea?
it was there to avoid the following situation:
on disk it's still in seconds kernel has the inode in memory, with a recently updated times user asks for it, gets nanoseconds data kernel evicts inode to disk user asks again, kernel reads from disk (in whole seconds only on disk) kernel reports a DIFFERENT time than it did before user program gets confused
this actually happens, make is one of those cases that get confused for example..
-- if you want to mail me at work (you don't), use arjan (at) linux.intel.com Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org
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