kclient: fix page_mkwrite for 2.6.30

This will change again soon when Nick's other fix gets merged.  Also, we
probably need to stop doing write_begin/end due to some differences in
behavior (e.g., no extending file size? see btrfs as a reference).

diff --git a/src/kernel/addr.c b/src/kernel/addr.c
index 3f6358e4866d63a26b910e00d643f801bdafed63..0b42eec3bd0702a4d167099badb97902af4887b3 100644 (file)
--- a/src/kernel/addr.c
+++ b/src/kernel/addr.c
@@ -1060,8 +1060,15 @@ const struct address_space_operations ceph_aops = {
 /*
  * Reuse write_{begin,end} here for simplicity.
  */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
+static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+#else
 static int ceph_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+#endif
 {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
+       struct page *page = vmf->page;
+#endif
        struct inode *inode = vma->vm_file->f_dentry->d_inode;
        loff_t off = page->index << PAGE_CACHE_SHIFT;
        loff_t size, len;
@@ -1084,6 +1091,15 @@ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct page *page)
                ceph_write_end(vma->vm_file, inode->i_mapping, off, len, len,
                               locked_page, fsdata);
        dout(10, "page_mkwrite %p %llu~%llu = %d\n", inode, off, len, ret);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
+       if (unlikely(ret)) {
+               if (ret == -ENOMEM)
+                       ret = VM_FAULT_OOM;
+               else /* -ENOSPC, -EIO, etc */
+                       ret = VM_FAULT_SIGBUS;
+       }
+#endif
        return ret;
 }