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SubjectRe: [PATCH 15/35] Unionfs: Common file operations


On Dec 4 2006 07:30, Josef 'Jeff' Sipek wrote:

>+long unionfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>+{
>+ long err;
>+
>+ if ((err = unionfs_file_revalidate(file, 1)))
>+ goto out;
>+
>+ /* check if asked for local commands */
>+ switch (cmd) {
>+ case UNIONFS_IOCTL_INCGEN:
>+ /* Increment the superblock generation count */
>+ err = -EACCES;
>+ if (!capable(CAP_SYS_ADMIN))
>+ goto out;
>+ err = unionfs_ioctl_incgen(file, cmd, arg);
>+ break;
>+
>+ case UNIONFS_IOCTL_QUERYFILE:
>+ /* Return list of branches containing the given file */
>+ err = unionfs_ioctl_queryfile(file, cmd, arg);
>+ break;
>+
>+ default:
>+ /* pass the ioctl down */
>+ err = do_ioctl(file, cmd, arg);
>+ break;
>+ }
>+
>+out:
>+ return err;
>+}


I think there was an ioctl for files to find out where a particular
file lives on disk. Do you think unionfs should handle it and return
something more or less meaningful?


-`J'
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