On 06/01/2010 02:00 PM, Eric Sandeen wrote:
tytso@xxxxxxx wrote:
On Tue, Jun 01, 2010 at 12:32:29PM -0700, Sunil Mushran wrote:
We (ocfs2) are looking to add a new attribute to denote files that
have a fixed allocation on disk. But at the same time, allow writes
that do not change the allocation on disk. No truncating, extending,
filling holes, etc. We were thinking of calling it "Static" files.
That's an interesting set of semantics, and it might make sense to
conflate that with a local disk "don't move or defrag" the file
option. I'm not crazy with the name "static", since it could mean a
number of other things in other contexts, but I admit I can't think of
a better name.
- Ted
fixed-mapping files maybe?
We had thought of the term static because we wanted the inode to
be frozen. Entire metadata including the mapping. Our aim is to
do away with cluster locks for such inodes. For ios, we were planning
to limit it to only odirect and not change the mtime. That also means
no links, touch. Yes, "static" does not fit it like a glove but that's the
best we could come up with.
Sunil
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