[uml-devel] garbage problems that I experienced

[Michael R. <mc...@sa...>]

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I had thought that I was putting it into a tmpfs, mounted on /var/tmp.
Oops... I mounted them only on /var/run and /tmp.

Switching to putting my klogd output on /tmp solves the problem.

Hypothesis, not yet confirmed (a trivial test did not confirm it):

the hostfs, if the process is killed, does truncate the file on the host
properly, but does not update the file length in the cached inode.
A subsequent attempt to cat the file will return garbage until the original
length of the file is reached. 

My trivial attempt:

east:/# ls -lta /var/tmp/klog.log
- -rwxr-xr-x    1 root     guest       30092 Aug 26 02:24 /var/tmp/klog.log
east:/# cat >/var/tmp/klog.log
hello there.

^C
east:/# ls -lta /var/tmp/klog.log
- -rwxr-xr-x    1 root     guest          13 Aug 26 02:52 /var/tmp/klog.log
east:/# cat /var/tmp/klog.log
hello there.
east:/#

so, that likely isn't quite it. But does this point anyone in the right
direction?

]       ON HUMILITY: to err is human. To moo, bovine.           |  firewalls  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
] mc...@sa... http://www.sandelman.ottawa.on.ca/ |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [
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