Hi, It seems that the parsing of ubd option is broken in kernels 3.4.X when using COW filesystems. Let me show the tests I've done so far.
When starting a virtual machine using a cow fs without pathname: linux-3.4.1 udba=cow_fs,debian.img it works, but the cow file created is named 'cow_fs,debian.img' instead of 'cow_fs'. However, when specifying full pathnames for the cow and root filesystem: linux-3.4.1 udba=/pathto/cow_fs,/pathto/debian.img you get a kernel panic and the following errors: Open of COW file '/root/uml/test/cow_fs,/root/uml/test/debian.img' failed, errno = 2 Failed to open '/root/uml/test/cow_fs,/root/uml/test/debian.img', errno = 2 ubda: Can't open "/root/uml/test/cow_fs,/root/uml/test/debian.img": errno = 2 Open of COW file '/root/uml/test/cow_fs,/root/uml/test/debian.img' failed, errno = 2 Failed to open '/root/uml/test/cow_fs,/root/uml/test/debian.img', errno = 2 ubda: Can't open "/root/uml/test/cow_fs,/root/uml/test/debian.img": errno = 2 VFS: Cannot open root device "98:0" or unknown-block(98,0): error -2 Please append a correct "root=" boot option; here are the available partitions: 6200 2097152 ubda driver: uml-blkdev Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0) The same tests work perfectly with kernel 3.3.8 and older versions. To test I've used a debian 6.0 rootfs. Any idea of the cause of the problem? A simple 'diff' between 3.3 and 3.4 versions shows the option parsing code has changed significantly. Best regards, David Fernández Virtual Networks over linuX (VNX) http://vnx.dit.upm.es ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
