| To: | David Chinner <dgc@xxxxxxx> |
|---|---|
| Subject: | Re: [RFC] add FIEMAP ioctl to efficiently map file allocation |
| From: | Andreas Dilger <adilger@xxxxxxxxxxxxx> |
| Date: | Tue, 1 May 2007 15:32:36 -0700 |
| Cc: | Nicholas Miell <nmiell@xxxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, hch@xxxxxxxxxxxxx |
| In-reply-to: | <20070501142049.GG77450368@melbourne.sgi.com> |
| Mail-followup-to: | David Chinner <dgc@xxxxxxx>, Nicholas Miell <nmiell@xxxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, hch@xxxxxxxxxxxxx |
| References: | <20070412110550.GM5967@schatzie.adilger.int> <20070416112252.GJ48531920@melbourne.sgi.com> <20070419002139.GK5967@schatzie.adilger.int> <20070419015426.GM48531920@melbourne.sgi.com> <20070430224401.GX5967@schatzie.adilger.int> <20070501042254.GD77450368@melbourne.sgi.com> <1177994346.3362.5.camel@entropy> <20070501142049.GG77450368@melbourne.sgi.com> |
| Sender: | xfs-bounce@xxxxxxxxxxx |
| User-agent: | Mutt/1.4.1i |
On May 02, 2007 00:20 +1000, David Chinner wrote: > My point was that there is a difference between specification and > implementation - if the specification says something is compulsory, > then they must be implemented in the filesystem. This is easy > enough to ensure by code review - we don't need additional interface > complexity for this.... What you seem to be missing about my proposal is that the FLAG_INCOMPAT is for future use by that part of the specification we haven't thought of yet... Having COMPAT/INCOMPAT flags has been very useful for ext2/3/4, and is much better than having version numbers for the interface. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. |
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