On Saturday 24 September 2005 20:12, [EMAIL PROTECTED] wrote: > Hi, > I cannot successfully move the backing file of a COW file. I am > following the instructions for moving the backing file given at:
> http://user-mode-linux.sourceforge.net/shared_fs.html > > e.g. I had > /somewhere/root_fs > /somewhere/root_fs_cow > > starting um with: > ./linux ubd0=/somewhere/root_fs_cow,/somewhere/root_fs > all works fine > > Now move the root_fs > mv /somewhere/root_fs /new/root_fs > > now start um: > ./linux ubd0=/somewhere/root_fs_cow,/new/root_fs > .... > Couldn't stat '/somewhere/root_fs', err = 2 > Couldn't stat "/somewhere/root_fs" : err = 2 This is what you complain about, but > Failed to get modification time of backing file "/somewhere/root_fs", err = > 2 > Failed to open '/somewhere/root_fs_cow', errno = 2 What's this? It doesn't even find the COW file. Would you please double check your configuration (say a startup script broken by the move or anyway some other change)? > VFS: Cannot open root device "98:0" or unknown-block(98,0) > Please append a correct "root=" boot option > Kernel panic - not syncing: VFS: Unable to mount root fs on > unknown-block(98,0) > I checked that the root_fs system was not corrupted by reverting to > the original location > cp -a /new/root_fs /somewhere/root_fs > Now it works again using the first um invocation showing that the move > itself was not a problem. > The documentation implies that starting um with the new backing file > location updates the original COW file: > > "UML will notice the mismatch between the command line and COW header, > check the size and mtime of the new backing file path, and update the > COW header to reflect it if it checks out." > > Can anyone report if this actually works: > > I am using a gentoo 2005.1 system with: > 2.6.12-gentoo-r6-skas3-v8.2 host kernel > UM kernel is the same source tree (gentoo patched 2.6.12) Btw: > usermode-utilities-20040406 Hope that's the -r1 Gentoo release (which contains a local DoS security fix - an unprivileged user could easily bring down an interface). -- Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894) http://www.user-mode-linux.org/~blaisorblade ___________________________________ Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB http://mail.yahoo.it ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ User-mode-linux-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
