Re: Local loopback mounts (RFD)
Jan Kasprzak (kas@informatics.muni.cz)
Mon, 31 May 1999 16:02:56 +0200
Alexander Viro wrote:
:
: > 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.
:
Well, if I do it using mount(2) and a new FS type, only root can do
it. And root is able to break the system anyway.
-Yenya
--
\ Jan "Yenya" Kasprzak <kas at fi.muni.cz> http://www.fi.muni.cz/~kas/
\\ PGP: finger kas at aisa.fi.muni.cz 0D99A7FB206605D7 8B35FCDE05B18A5E //
\\\ Czech Linux Homepage: http://www.linux.cz/ ///
|||| > Where do the -- MARK --s come from ? ||||
|||| It is the sound of Tux the penguin chewing on your system logs. ||||
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/