[PATCH] mmap zero-length hugetlb file with PROT_NONE to protect a hugetlb virtual area

["Zhang, Yanmin" <yanmin_zhang@linux.intel.com>]

From: Zhang, Yanmin <yanmin.zhang@intel.com>

Sometimes, applications need below call to be successful although
"/mnt/hugepages/file1" doesn't exist.

fd = open("/mnt/hugepages/file1", O_CREAT|O_RDWR, 0755);
*addr = mmap(NULL, 0x1024*1024*256, PROT_NONE, 0, fd, 0);

As for regular pages (or files), above call does work, but as for huge pages,
above call would fail because hugetlbfs_file_mmap would fail if 
(!(vma->vm_flags & VM_WRITE) && len > inode->i_size). 
 
This capability on huge page is useful on ia64 when the process wants to 
protect one area on region 4, so other threads couldn't read/write this
area. A famous JVM (Java Virtual Machine) implementation on IA64 needs the
capability.

The patch against 2.6.17-mm6 provides the capability.

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>

---

diff -Nraup linux-2.6.17_mm6/fs/hugetlbfs/inode.c linux-2.6.17_mm6_hugetlb/fs/hugetlbfs/inode.c
--- linux-2.6.17_mm6/fs/hugetlbfs/inode.c	2006-07-04 10:18:38.000000000 +0800
+++ linux-2.6.17_mm6_hugetlb/fs/hugetlbfs/inode.c	2006-07-04 10:20:10.000000000 +0800
@@ -83,8 +83,6 @@ static int hugetlbfs_file_mmap(struct fi
 
 	ret = -ENOMEM;
 	len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
-	if (!(vma->vm_flags & VM_WRITE) && len > inode->i_size)
-		goto out;
 
 	if (vma->vm_flags & VM_MAYSHARE &&
 	    hugetlb_reserve_pages(inode, vma->vm_pgoff >> (HPAGE_SHIFT-PAGE_SHIFT),
@@ -93,7 +91,7 @@ static int hugetlbfs_file_mmap(struct fi
 
 	ret = 0;
 	hugetlb_prefault_arch_hook(vma->vm_mm);
-	if (inode->i_size < len)
+	if (vma->vm_flags & VM_WRITE && inode->i_size < len)
 		inode->i_size = len;
 out:
 	mutex_unlock(&inode->i_mutex);
-
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