hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization

[linux-2.6-microblaze.git] / include / linux / hugetlb.h

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 1e897e4..4ba379e 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -109,6 +109,8 @@ u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
 
 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
 
+struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
+
 extern int sysctl_hugetlb_shm_group;
 extern struct list_head huge_boot_pages;
 
@@ -151,6 +153,12 @@ static inline unsigned long hugetlb_total_pages(void)
        return 0;
 }
 
+static inline struct address_space *hugetlb_page_mapping_lock_write(
+                                                       struct page *hpage)
+{
+       return NULL;
+}
+
 static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr,
                                        pte_t *ptep)
 {