Hi Andrew,
On Fri, 1 Feb 2002, Andrew Tipton wrote:
> If I have an image (initrd.img for example) located on a tmpfs
> filesystem, when I attempt to mount it:
>
> % mount -o loop /initrd.img /mnt
> ioctl: LOOP_SET_FD: Invalid argument
In the latest 2.4 sources you will find a file
Documentation/filesystems/tmpfs.txt which describes this problem.
> What is the best way to fix this short-term? I could bypass the
> readpage check in loop_set_fd, or I could add a dummy readpage entry
> to the address_space_operations struct for tmpfs. Would either of
> these have serious repercussions?
I do not see an easy and clean way so far. The check for readpage is
definitely needed. loop.c does rely on generic_file_{read,write} and
not on the files read and write operations. So IMHO the cleanest way
is to provide readpage et.al. in shmem.c and use generic_file_{read,write}
instead of specialized shmem_{read,write} functions. Unfortunately
this would mean a nontrivial change to the readpage semantics.
Greetings
Christoph
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This archive was generated by hypermail 2b29 : Thu Feb 07 2002 - 21:00:27 EST