Add buffer head related helper functions

[linux-2.6-omap-h63xx.git] / mm / hugetlb.c

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 7224a4f071067c3d60a017d949daa2e97f0e8a5d..db861d8b6c2824f460cc177f0d4008fd8850cc3e 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -418,9 +418,14 @@ static struct page *alloc_huge_page_private(struct vm_area_struct *vma,
        if (free_huge_pages > resv_huge_pages)
                page = dequeue_huge_page(vma, addr);
        spin_unlock(&hugetlb_lock);
-       if (!page)
+       if (!page) {
                page = alloc_buddy_huge_page(vma, addr);
-       return page ? page : ERR_PTR(-VM_FAULT_OOM);
+               if (!page) {
+                       hugetlb_put_quota(vma->vm_file->f_mapping, 1);
+                       return ERR_PTR(-VM_FAULT_OOM);
+               }
+       }
+       return page;
 }
 
 static struct page *alloc_huge_page(struct vm_area_struct *vma,
@@ -694,6 +699,11 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
                dst_pte = huge_pte_alloc(dst, addr);
                if (!dst_pte)
                        goto nomem;
+
+               /* If the pagetables are shared don't copy or take references */
+               if (dst_pte == src_pte)
+                       continue;
+
                spin_lock(&dst->page_table_lock);
                spin_lock(&src->page_table_lock);
                if (!pte_none(*src_pte)) {
@@ -1206,8 +1216,10 @@ int hugetlb_reserve_pages(struct inode *inode, long from, long to)
        if (hugetlb_get_quota(inode->i_mapping, chg))
                return -ENOSPC;
        ret = hugetlb_acct_memory(chg);
-       if (ret < 0)
+       if (ret < 0) {
+               hugetlb_put_quota(inode->i_mapping, chg);
                return ret;
+       }
        region_add(&inode->i_mapping->private_list, from, to);
        return 0;
 }