Re: [fuse-devel] Re: fusermount: mount failed: Invalid argument

[Miklos S. <mi...@sz...>]

> > > DEBUG fusermount: optbuf = fd=4,rootmode=40000,user_id=0,group_id=0
> > > unique: 1, opcode: ??? (0), nodeid: 0, insize: 56
> > >    unique: 1, error: -5 (Input/output error), outsize: 16
> > > fuse: writing device: Invalid argument
> > > 
> > > I assume this is the infamous ARM problem?
> > 
> > Yes.
> > 
> > Can you try this workaround?
> 
> I tried it on 2.6.0-pre2, but I get an undefined reference to "page" in the
> flush_cache_page call. Should I use another version of fuse?

No, the patch was wrong, in more ways than one.

Here's a better one, hopefully.

Miklos

Index: linux/fs/fuse/dev.c
===================================================================
--- linux.orig/fs/fuse/dev.c	2006-04-12 19:24:43.000000000 +0200
+++ linux/fs/fuse/dev.c	2006-04-13 09:10:32.000000000 +0200
@@ -410,6 +410,7 @@ static void fuse_copy_finish(struct fuse
 static int fuse_copy_fill(struct fuse_copy_state *cs)
 {
 	unsigned long offset;
+	struct vm_area_struct *vma;
 	int err;
 
 	unlock_request(cs->fc, cs->req);
@@ -423,13 +424,14 @@ static int fuse_copy_fill(struct fuse_co
 	}
 	down_read(&current->mm->mmap_sem);
 	err = get_user_pages(current, current->mm, cs->addr, 1, cs->write, 0,
-			     &cs->pg, NULL);
+			     &cs->pg, &vma);
 	up_read(&current->mm->mmap_sem);
 	if (err < 0)
 		return err;
 	BUG_ON(err != 1);
 	offset = cs->addr % PAGE_SIZE;
 	cs->mapaddr = kmap_atomic(cs->pg, KM_USER0);
+	flush_cache_page(vma, cs->addr, page_to_pfn(cs->pg));
 	cs->buf = cs->mapaddr + offset;
 	cs->len = min(PAGE_SIZE - offset, cs->seglen);
 	cs->seglen -= cs->len;