Messages in this thread | | | Date | Tue, 04 Jul 2006 23:45:52 -0600 | From | "Jeffrey V. Merkey" <> | Subject | Re: ext4 features |
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H. Peter Anvin wrote:
> Bill Davidsen wrote: > >>> >>> DC> Easily doable in userspace, why bother with kernel programming >>> >>> In userspace you can't automatically delete the files when the space >>> becomes needed. The LD_PRELOAD/glibc methods also have the >>> disadvantage of having to figure out where a file goes when it's >>> deleted, depending on which device it happens to reside on. Demanding >>> read access to /proc/mounts just to do rm could cause problems. >>> >>> Userspace has had 10 years to invent a good solution. If it was so >>> easy, it would probably have been done. >>> >> Actually, if it were so important it WOULD have been done. I suspect >> that the issue is not lack of a good solution, but lack of a good >> problem. The behavior you propose requires a lot of kernel >> cleverness, including make the inodes seem to go away, so the count >> is "right" for what the user sees. >> > > The real solution for it is snapshots.
Peter,
Explain what you are thinking here. What I proposed, I have already implemented in NetWare, it's very easy to do. Snapshotting is not complex for FS's but does require a lot of space for meta-data to manage it. EXT is not architecteced for something this complex. A simple hidden mv is much easier to do.
Jeff
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