Messages in this thread | | | From | Al Boldi <> | Subject | Re: [RFC 00/26] VFS based Union Mount (V2) | Date | Mon, 30 Jul 2007 21:23:24 +0300 |
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Jan Blunck wrote: > Here is another post of the VFS based union mount implementation. Unlike > the traditional mount which hides the contents of the mount point, union > mounts present the merged view of the mount point and the mounted > filesytem.
Great!
> Recent changes: > - brand new union structure no longer tied to the dentryn, now works with > bind mounts > - generic part of the whiteout patches extracted > - introduces MS_WHITEOUT to make the white-out patches independant of the > union-mount stuff > - uses a singleton whiteout inode for the tmpfs filesystem (I need to fix > this for ext2/3, too) > - renaming files on unions uses copyup now
I wonder if this copyup functionality could be generalized to induce CoW when modifying hard-linked files. Does that sound feasible?
> - rewrote the union mount debugging code: it is now debugfs/relay based. > - random cleanups > > I'm able to compile the kernel with this patches applied on a 3 layer > union mount with the seperate layers bind mounted to different locations. > I haven't done any performance tests since I think there is a more > important topic ahead: better readdir() support.
What about the umount oops? Did that get fixed?
> This series is against 2.6.22-rc6-mm1.
Things as big and important like this should probably also be diff'd against mainline, to increase testing input.
Thanks!
-- Al
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