get_unmapped_area handles MAP_FIXED in hugetlbfs

[safe/jmp/linux-2.6] / fs / hugetlbfs / inode.c

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 26ba81f..fe625cd 100644 (file)
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -22,6 +22,7 @@
 #include <linux/backing-dev.h>
 #include <linux/hugetlb.h>
 #include <linux/pagevec.h>
+#include <linux/mman.h>
 #include <linux/quotaops.h>
 #include <linux/slab.h>
 #include <linux/dnotify.h>
@@ -33,7 +34,7 @@
 /* some random number */
 #define HUGETLBFS_MAGIC        0x958458f6
 
-static struct super_operations hugetlbfs_ops;
+static const struct super_operations hugetlbfs_ops;
 static const struct address_space_operations hugetlbfs_aops;
 const struct file_operations hugetlbfs_file_operations;
 static const struct inode_operations hugetlbfs_dir_inode_operations;
@@ -98,10 +99,7 @@ out:
  * Called under down_write(mmap_sem).
  */
 
-#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
-unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
-               unsigned long len, unsigned long pgoff, unsigned long flags);
-#else
+#ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 static unsigned long
 hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
                unsigned long len, unsigned long pgoff, unsigned long flags)
@@ -115,6 +113,12 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
        if (len > TASK_SIZE)
                return -ENOMEM;
 
+       if (flags & MAP_FIXED) {
+               if (prepare_hugepage_range(addr, len, pgoff))
+                       return -EINVAL;
+               return addr;
+       }
+
        if (addr) {
                addr = ALIGN(addr, HPAGE_SIZE);
                vma = find_vma(mm, addr);
@@ -453,7 +457,7 @@ static int hugetlbfs_symlink(struct inode *dir,
  */
 static int hugetlbfs_set_page_dirty(struct page *page)
 {
-       struct page *head = (struct page *)page_private(page);
+       struct page *head = compound_head(page);
 
        SetPageDirty(head);
        return 0;
@@ -580,7 +584,7 @@ static const struct inode_operations hugetlbfs_inode_operations = {
        .setattr        = hugetlbfs_setattr,
 };
 
-static struct super_operations hugetlbfs_ops = {
+static const struct super_operations hugetlbfs_ops = {
        .alloc_inode    = hugetlbfs_alloc_inode,
        .destroy_inode  = hugetlbfs_destroy_inode,
        .statfs         = hugetlbfs_statfs,