i know that :) i guess my questions were
1) why the same piece of code duplicated in all ``mount_xxx'' utilities?
2) if we are loading fs kernel module from ``mount_xxx'' why
we have to do it again in kernel?
if i'm not missing anything, by the time we reach ``mount''
function, fs module will be in the memory and this code will
never be executed.
thanks,
emax
> I believe that it is used to dynamic load filesystem modules.
> Please read
> the following pages to understand what is a kernel module:
>
> http://thc.inferno.tusculum.edu/files/thc/bsdkern.html
>
> > i've been looking at ``mount_xxx'' code and have noticed
> "strange" thing.
> > all ``mount_xxx'' utilities have common part of code, like
> >
> > error = getvfsbyname("xxx", &vfc);
> > if (error && vfsisloadable("xxx")) {
> > if (vfsload("xxx"))
> > err(EX_OSERR, "vfsload(xxx)");
> > endvfsent(); /* flush cache */
> > error = getvfsbyname("xxx", &vfc);
> > }
> > if (error)
> > errx(1, "xxx filesystem is not available");
> >
> > if (mount(vfc.vfc_name, dir, mntflags, &args) < 0)
> > err(1, NULL);
> >
> > 1) what is the reason for this? why can't move this code to
> ``mount''?
> > 2) what is the purpose of the following code in
> > ``/sys/kern/vfs_syscalls.c''?
> >
> > ...
> > for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
> > if (!strcmp(vfsp->vfc_name, fstypename))
> > break;
> > if (vfsp == NULL) {
> > linker_file_t lf;
> >
> > /* Refuse to load modules if securelevel raised */
> > if (securelevel > 0) {
> > vput(vp);
> > return EPERM;
> > }
> > /* Only load modules for root (very important!) */
> > if ((error = suser(p)) != 0) {
> > vput(vp);
> > return error;
> > }
> > error = linker_load_file(fstypename, &lf);
> > if (error || lf == NULL) {
> > vput(vp);
> > if (lf == NULL)
> > error = ENODEV;
> > return error;
> > }
> > ...
> >
> > from my understanding this is done to load FS module.
> > or did i miss someting?
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