[vbox-dev] Keeping up with Linus?

[Larry Finger]

Larry Finger wrote:
> w41ter at gmail.com wrote:
>> The code in question is:
>> static struct vm_operations_struct sf_vma_ops = {
>>         .nopage = sf_reg_nopage
>> };
>>
>> I can find the problem but I don't know enough to fix it :-/
>> Does this look hard to fix, or not so much?
> 
> That one is harder as it changes how one calculates the offset. If I get 
> bored, I'll try to figure it out.

I guess I got bored, but the following patch compiles, the module loads, 
_AND_ survived minimal testing.

Larry
---

Index: vbox/src/VBox/Additions/linux/sharedfolders/regops.c
===================================================================
--- vbox.orig/src/VBox/Additions/linux/sharedfolders/regops.c
+++ vbox/src/VBox/Additions/linux/sharedfolders/regops.c
@@ -314,14 +314,19 @@ sf_reg_release (struct inode *inode, str
          return 0;
  }

-static struct page *
+#if LINUX_VERSION_CODE > KERNEL_VERSION (2, 6, 25)
+static int sf_reg_fault( struct vm_area_struct *vma, struct vm_fault *vmf)
+#else
  #if LINUX_VERSION_CODE < KERNEL_VERSION (2, 6, 0)
+static struct page *
  sf_reg_nopage (struct vm_area_struct *vma, unsigned long vaddr, int unused)
  #define SET_TYPE(t)
  #else
+static struct page *
  sf_reg_nopage (struct vm_area_struct *vma, unsigned long vaddr, int *type)
  #define SET_TYPE(t) *type = (t)
-#endif
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION (2, 6, 0) */
+#endif /*  LINUX_VERSION_CODE > KERNEL_VERSION (2, 6, 25) */
  {
          struct page *page;
          char *buf;
@@ -334,35 +339,56 @@ sf_reg_nopage (struct vm_area_struct *vm
          struct sf_reg_info *sf_r = file->private_data;

          TRACE ();
+#if LINUX_VERSION_CODE > KERNEL_VERSION (2, 6, 25)
+	if (vmf->pgoff > vma->vm_end)
+		return VM_FAULT_SIGBUS;
+#else
          if (vaddr > vma->vm_end) {
                  SET_TYPE (VM_FAULT_SIGBUS);
                  return NOPAGE_SIGBUS;
          }
+#endif

          page = alloc_page (GFP_HIGHUSER);
          if (!page) {
                  LogRelFunc(("failed to allocate page\n"));
+#if LINUX_VERSION_CODE > KERNEL_VERSION (2, 6, 25)
+		return VM_FAULT_OOM;
+#else
                  SET_TYPE (VM_FAULT_OOM);
                  return NOPAGE_OOM;
+#endif
          }

          buf = kmap (page);
+#if LINUX_VERSION_CODE > KERNEL_VERSION (2, 6, 25)
+	off = (vmf->pgoff << PAGE_SHIFT);
+#else
          off = (vaddr - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
+#endif
          err = sf_reg_read_aux (__func__, sf_g, sf_r, buf, &nread, off);
          if (err) {
                  kunmap (page);
                  put_page (page);
+#if LINUX_VERSION_CODE > KERNEL_VERSION (2, 6, 25)
+		return VM_FAULT_SIGBUS;
+#else
                  SET_TYPE (VM_FAULT_SIGBUS);
                  return NOPAGE_SIGBUS;
+#endif
          }

          BUG_ON (nread > PAGE_SIZE);
          if (!nread) {
+#if LINUX_VERSION_CODE > KERNEL_VERSION (2, 6, 25)
+		clear_user_page (page_address (page), vmf->pgoff, page);
+#else
  #if LINUX_VERSION_CODE < KERNEL_VERSION (2, 6, 0)
                  clear_user_page (page_address (page), vaddr);
  #else
                  clear_user_page (page_address (page), vaddr, page);
  #endif
+#endif
          }
          else {
                  memset (buf + nread, 0, PAGE_SIZE - nread);
@@ -370,14 +396,24 @@ sf_reg_nopage (struct vm_area_struct *vm

          flush_dcache_page (page);
          kunmap (page);
+#if LINUX_VERSION_CODE < KERNEL_VERSION (2, 6, 25)
          SET_TYPE (VM_FAULT_MAJOR);
          return page;
+#else
+	vmf->page = page;
+	return 0;
+#endif
  }

  static struct vm_operations_struct sf_vma_ops = {
+#if LINUX_VERSION_CODE > KERNEL_VERSION (2, 6, 25)
+	.fault = sf_reg_fault
+#else
          .nopage = sf_reg_nopage
+#endif
  };

+
  static int
  sf_reg_mmap (struct file *file, struct vm_area_struct *vma)
  {

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