Messages in this thread |  | | | Date | Fri, 13 May 2005 14:24:51 +0200 | | From | Jörn Engel <> | | Subject | Re: [ANNOUNCE] mini_fo-0.6.0 overlay file system |
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On Fri, 13 May 2005 07:26:14 -0400, Kyle Moffett wrote: > > >It solves the biggest concern I had left for union mount. Actually > >implementing it, though, depends on quite a bit of infrastructure > >that just > >doesn't exist yet. Still, a very interesting idea. > > For ext2/ext3, the sparse-file-support _does_ exist, so the only > major parts > that need to be added are: > o An extra ext2/ext3 flag that indicates nonresidence (For both > sparse > files, normal files, and directories). > o VFS-level support for the union operation with hooks to let each > filesystem do something special.
That and replacing the page cache by something different. Page cache is referencing pages by inode,offset pairs. Having a potentially infinite amount of inodes to look at, in order, may require a tiny bit of patching. ;)
Jörn
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