Hi Karel,
Karel Zak <kzak@xxxxxxxxxx> writes:
> Hi Matthias,
>
> On Thu, Nov 06, 2008 at 02:45:38PM +0100, Matthias Koenig wrote:
>> Currently mounting an image fails if it is readonly.
>
> sorry, but I have a stupid question -- what do you mean with "readonly",
> file (image) permissions or filesystem mode?
Access permissions of the filesystem, but this is not really correct...see below.
>
>> set_loop checks only for EROFS to retry open with readonly mode,
>> but in this case we get EACCES.
>
> I have a problem to reproduce this problem. Do you have any example?
Hmm ok, after evaluating this again more carefully, there are no
problems if it is a file on a local filesystem.
It seems only to happen if it is a NFS mounted image, which is
read-write in permission but with root_squash option.
# cat /etc/exports
/test *(async,rw,no_subtree_check,root_squash)
# mount
giuliani:/test on /test type nfs (rw,addr=10.10.4.24,nfsvers=3,proto=tcp,mountproto=udp)
# ls -l /test/
total 10256
-rw-r--r-- 1 root root 10485760 2008-11-13 22:35 voltest
# mount -oloop /test/voltest /mnt
/test/voltest: Permission denied
# strace -e open mount -oloop /test/voltest /mnt
[...]
open("/test/voltest", O_RDWR) = -1 EACCES (Permission denied)
[...]
But on a local file:
# ls -l /tmp/vol.ext3
-r--r--r-- 1 root root 536870912 2008-04-14 12:27 /tmp/vol.ext3
# mount -oloop /tmp/vol.ext3 /mnt
No problem here.
Matthias
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