On Wednesday 03 August 2005 23:01, Jason Clark wrote: > Here is the output trying to use /dev/md1 as my cow file and > /mnt/cow/rootfs.cow as my backing file > > [EMAIL PROTECTED]:/mnt# linux ubd0=/dev/md1,/mnt/cow/rootfs.cow > ... > [42949373.530000] Console initialized on /dev/tty0 > [42949373.530000] Initializing software serial port version 1 > [42949373.570000] Failed to read COW header from COW file "/dev/md1", > errno = 22 > [42949373.570000] Failed to open '/dev/md1', errno = 22 > [42949373.570000] VFS: Cannot open root device "98:0" or > unknown-block(98,0) > [42949373.570000] Please append a correct "root=" boot option > [42949373.570000] Kernel panic - not syncing: VFS: Unable to mount root fs > on unknown-block(98,0) > [42949373.570000] > [42949373.570000] EIP: 0073:[<b7e85551>] CPU: 0 Not tainted ESP: > 007b:b7e5afb0 EFLAGS: 00000246 > ... > > I get the same results trying to use a block device. Attemping a uml_mkcow > with md1 as my cow and md2 as my backing file generates the following > > [EMAIL PROTECTED]:/mnt# uml_mkcow /dev/md1 /dev/md2 > open COW file: File exists
> [EMAIL PROTECTED]:/mnt# uml_mkcow -f /dev/md1 /dev/md2 > cow bitmap lseek failed : errno = 22 > write_cow_header: Invalid argument Let me guess - your md1 file is *big* (more than 2G), right? Or it isn't set up well (but I leave that as an exercise to the reader). I think I found that for uml_utilities: tools/moo/cow_sys.h -> cow_seek_file, replace lseek with lseek64 and recompile - I guess the offset got truncated. For the UML kernel, unless it's unreasonably old, that should not be the problem, although something on those lines may have happened... Inside cow.c:init_cow_file, where the first error is printed, can you add a debug "printf" statement for the offset to check it's reasonable, and do a strace on the thing to see if the problem. Another hypotesis (which is strange for me, but just off the top of my head): has UML problems because HD can't be sparse files? lseek should work as well, but who knows... -- 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 the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
