Messages in this thread | | | From | Claudio Martins <> | Subject | Re: unionfs | Date | Mon, 15 Mar 2004 17:09:11 +0000 |
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On Monday 15 March 2004 16:13, Jörn Engel wrote: > On Mon, 15 March 2004 22:35:20 +0800, Ian Kent wrote: > > I don't understand the requirement properly. Sorry. > > Depends on who you ask, but imo it boils down to this: > - Use one filesystem as backing store, usually ro. > - Have another filesystem on top for extra functionality, usually rw > access. > > Famous example is a rw-CDROM, where writes go to hard drive and > unchanged data is read from CDROM. But it makes sense for other > things as well.
If I understand correctly this unionfs feature would also be the cleanest way of changing the root filesystem after using an initrd ramdisk on boot. Currently the pivot_root call is used to change root but that still implies a bit of a hack. You can read about it on this fine paper:
http://www.cis.udel.edu/~zhi/www.docshow.net/linux/ols.zip
It's also a good read if you want to understand the linux bootloaders and the boot process in general.
Regards
Claudio
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