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#uml IRC Logs for 2009-06-03

---Logopened Wed Jun 03 00:00:38 2009
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17:09<hacktolive:#uml>hi all, anyone knows how to create a COW (copy-on-write) for UML? I can't find any info on the internet.... thanks
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17:25<bldewolf:#uml>hacktolive: have you installed the usermode utilities
17:25<bldewolf:#uml>on the host
17:26<hacktolive:#uml>just installed now... but I don't know how to create a COW...
17:26<hacktolive:#uml>is it a raw filesystem? (created with dd?)
17:26<hacktolive:#uml>I'm not familiar with "COW"?
17:27<hacktolive:#uml>what command is used to create one COW-file?
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18:47<bldewolf:#uml>hacktolive: http://user-mode-linux.sourceforge.net/old/shared_fs.html
18:47<bldewolf:#uml>that's kind of out of date though
18:51<bldewolf:#uml>actually no it looks fine, sorry
18:54<hacktolive:#uml>bldewolf, I have read that, thanks, but I'm still a bit confused... the problem is that I'm working with non standard files
18:54<hacktolive:#uml>i am working with mountlo, trying to modify the source, so that I can mount many files at the same time: http://pastebin.com/f3af90d85
19:01<bldewolf:#uml>I'm not sure what you're trying to do
19:01<bldewolf:#uml>you can mount multiple files as block devices with uml already?
19:03<hacktolive:#uml>I am not working with uml itself, I don't even have a root-filesystem
19:03<hacktolive:#uml>my "ultimate goal" is to be able to mount the same file several times (as non-root user)
19:06<hacktolive:#uml>the problem is that I always get the same errors:
19:06<hacktolive:#uml> --- kernel messages:
19:06<hacktolive:#uml>F_SETLK failed, file already locked by pid 23117
19:06<hacktolive:#uml>Failed to lock './a.runz', err = 11
19:06<hacktolive:#uml>Failed to open './a.runz', errno = 11
19:06<hacktolive:#uml>ubda: Can't open "./a.runz": errno = 11
19:07<hacktolive:#uml>and I think its UML "fault"... but I'm not sure
19:07<bldewolf:#uml>what does it have to do with UML, then?
19:08<hacktolive:#uml>it uses UML to be able to mount in user-mode (non-root)
19:08<hacktolive:#uml>and I think this error is related to UML...
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19:10<bldewolf:#uml>have you look into something like unionfs-fuse?
19:11<bldewolf:#uml>for doing cow
19:12<hacktolive:#uml>not really... never had considered... but it might be a good idea...
19:14<bldewolf:#uml>I've personally only used the kernel implementions of unionfs, but they seem like a better idea than dragging UML in and hacking something yourself :)
19:15<hacktolive:#uml>hmm.... very good idea indeed... attacking the problem from other angle... clever... thanks... it **might** work after doing some modifications to the code...
19:15<bldewolf:#uml>no problem, good luck
19:19<hacktolive:#uml>thanks... the problem with that is that it is harder to keep track of mounted files... it was just easier to be able to mount the same file many times... but... at least its an idea worth trying!
19:21<bldewolf:#uml>well, I think with unionfs you could mount the base file once, then use that as a read-only part of only unionfs mounts to it
19:26<hacktolive:#uml>yeah, just had an idea how to keep track of it...
19:31<hacktolive:#uml>holy c*ap, the union-fs really works! Know I just have to code it, and add a way to keep track of files...
19:31<hacktolive:#uml>thanks a lot, I really appreciate it!
19:32<hacktolive:#uml>time to go, bye! thanks
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---Logclosed Thu Jun 04 00:00:42 2009