Messages in this thread |  | | From | Kari Hurtta <> | Subject | Re: Virtual(?) kernel root | Date | Sun, 28 Oct 2001 10:25:27 +0200 (EET) |
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<...> > The key point is in fact that there is the idea of a virtual kernel > root, with some pseudo fs already set: > > / > | > --/dev > | > --/kbin > | > --/proc > > The "kernel" can be used via an interface that could be, for example, a > simple interface for debugging purpose, or a simple interface to change > the boot parameters. > > Supplementary resources can be mounted on the kernel root (what is > called "root fs") with the difference that the kernel root virtual fs > stays always _on top_ : non kernel root fs don't mask the only root (the > kernel one), they just add resources to the root directory. > > The advantages? > > There is no more root problem for kernel threads, since > kernel threads run with the reference of the inchanged kernel root, the > common "root fs" being simply mounted or unmounted. No more "sliding > carpet" problem. > > One can test or question the kernel via a simple interface for debugging > purposes. Not mounting supplementary resources doesn't create a panic, > but leave a bare bones kernel, giving for example the choice to the user > to give boot parameters. > > The /dev (this is already the case with devfs) doesn't prevent from > mounting the "root" ro (for example when syslog tries to access a device > file created at run time). > > Has an equivalent scheme being already discussed?
On linux/fs/namespace.c there is following comment: (from linux 2.4.12)
/* * Absolutely minimal fake fs - only empty root directory and nothing else. * In 2.5 we'll use ramfs or tmpfs, but for now it's all we need - just * something to go with root vfsmount. */ <...> static DECLARE_FSTYPE(root_fs_type, "rootfs", rootfs_read_super, FS_NOMOUNT);
But I do not think that that comment refers to equivalent scheme than what you are proposing.
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