Messages in this thread | | | Date | Sat, 21 Feb 2004 18:46:31 +0100 | From | Ingo Molnar <> | Subject | Re: explicit dcache <-> user-space cache coherency, sys_mark_dir_clean(), O_CLEAN |
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* viro@parcelfarce.linux.theplanet.co.uk <viro@parcelfarce.linux.theplanet.co.uk> wrote:
> On Sat, Feb 21, 2004 at 08:58:53AM +0100, Ingo Molnar wrote: > > filesystems that dont have 64-bit, monotonic timestamps will return > > -ENOSYS. This should include even XFS at the moment, because the > > timestamp is not guaranteed to be monotonic. > > > any other problems with this concept? > > If we are demanding specific filesystems, we could simply say "use JFS > in case-insensitive mode" and be done with that. Which deals with all > problems, since fs code will guarantee uniqueness, etc.
what i propose is a pretty generic feature that we need anyway (current 32-bit, 1-sec granular mtime in most filesystems is already problematic for things like make dependencies), while "use JFS in case-insensitive mode" is to degrade a filesystem to a non-POSIX mode. I dont think the two approaches are equivalent. Having good, monotonic, finegrained timestamps is a thing of the future - case-insensitive lowlevel filesystems are a thing of the past.
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