Messages in this thread | | | Date | Thu, 03 Jan 2002 15:10:23 -0800 | From | Andrew Morton <> | Subject | Re: losetuping files in tmpfs fails? |
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Andy Gaynor wrote: > > Whilst trying to figure out why my dang stripes won't persist (a separate > but worrisome issue), I wrote a dittie which creates a couple junk files in > /tmp (tmpfs), associates loop devices with them, whoops, losetup craps out. > > ... > /tmp# mount | grep tmp # Filesystem is ... > tmpfs on /tmp type tmpfs (rw) # tmpfs > /tmp# echo foo > foo # Create file foo > /tmp# losetup /dev/loop/5 foo # Give foo to /dev/loop/5 > ioctl: LOOP_SET_FD: Invalid argument # DISCO!!! <o > <o >
Yup, tmpfs doesn't provide some of the facilities which the loop driver requires. Specifically, prepare_write() and commit_write().
Probably it's not too hard to change loop to use generic_file_write(), and it will then permit tmpfs file-backed loop mounts.
It's not obvious that there's a burning need to support loop-on-tmpfs though, is there?
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