lkml.org 
[lkml]   [2002]   [Jan]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: losetuping files in tmpfs fails?
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?

-
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:15    [W:0.169 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site