Messages in this thread | | | Date | Mon, 31 May 1999 09:54:50 -0400 (EDT) | From | Alexander Viro <> | Subject | Re: Local loopback mounts (RFD) |
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On Mon, 31 May 1999, Jan Kasprzak wrote:
> Hello all, > > I think the Linux dentry mechanism can allow us to have > loopback mounts faster and more effective than NFS mount from 127.0.0.1. Note
Yes, but the way you have proposed is broken.
> The loopfs_read_super() just creates the root dentry and points > its dentry->d_inode to the inode of the target directory. This has the > advantage that both /some/directory and /another/directory works with > same inodes, so file locks works properly, open(O_EXCL) works properly, etc.
... and one can trivially create loops in on-disk structure that way (think of nasty games with rename()). We do need a way to compute the foo-is-ancestor-of-bar relation.
> I want to ask you whether the new pseudo-filesystem is the right > interface to have. Or should we do someting completely different (e.g. extend > ext2fs to support non-tree topology, or do the same thing at the VFS layer, > but not using mountpoints. What do you think about it?
stackable filesystems. In VFS. And there still are some things to change in VFS/fs interface before it will become possible.
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