hugetlb: reserve huge pages for reliable MAP_PRIVATE hugetlbfs mappings until fork()

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

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 2c13715e9ddea9f643c6a66c613ffcabee091f1c..185b14c9f021fb9d3fb76ae6a1296f8e71206a73 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -1,11 +1,14 @@
 #ifndef _LINUX_HUGETLB_H
 #define _LINUX_HUGETLB_H
 
+#include <linux/fs.h>
+
 #ifdef CONFIG_HUGETLB_PAGE
 
 #include <linux/mempolicy.h>
 #include <linux/shm.h>
 #include <asm/tlbflush.h>
+#include <asm/hugetlb.h>
 
 struct ctl_table;
 
@@ -14,9 +17,12 @@ static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
        return vma->vm_flags & VM_HUGETLB;
 }
 
+void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
+int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
+int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
-int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
+int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
@@ -25,10 +31,13 @@ int hugetlb_report_node_meminfo(int, char *);
 unsigned long hugetlb_total_pages(void);
 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
                        unsigned long address, int write_access);
-int hugetlb_reserve_pages(struct inode *inode, long from, long to);
+int hugetlb_reserve_pages(struct inode *inode, long from, long to,
+                                               struct vm_area_struct *vma);
 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
 
 extern unsigned long max_huge_pages;
+extern unsigned long sysctl_overcommit_huge_pages;
+extern unsigned long hugepages_treat_as_movable;
 extern const unsigned long hugetlb_zero, hugetlb_infinity;
 extern int sysctl_hugetlb_shm_group;
 
@@ -45,67 +54,23 @@ int pmd_huge(pmd_t pmd);
 void hugetlb_change_protection(struct vm_area_struct *vma,
                unsigned long address, unsigned long end, pgprot_t newprot);
 
-#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
-#define is_hugepage_only_range(mm, addr, len)  0
-#endif
-
-#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
-#define hugetlb_free_pgd_range free_pgd_range
-#else
-void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
-                           unsigned long end, unsigned long floor,
-                           unsigned long ceiling);
-#endif
+#else /* !CONFIG_HUGETLB_PAGE */
 
-#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
-/*
- * If the arch doesn't supply something else, assume that hugepage
- * size aligned regions are ok without further preparation.
- */
-static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
-                                               pgoff_t pgoff)
+static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
 {
-       if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
-               return -EINVAL;
-       if (len & ~HPAGE_MASK)
-               return -EINVAL;
-       if (addr & ~HPAGE_MASK)
-               return -EINVAL;
        return 0;
 }
-#else
-int prepare_hugepage_range(unsigned long addr, unsigned long len,
-                                               pgoff_t pgoff);
-#endif
-
-#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
-#define set_huge_pte_at(mm, addr, ptep, pte)   set_pte_at(mm, addr, ptep, pte)
-#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
-#else
-void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
-                    pte_t *ptep, pte_t pte);
-pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
-                             pte_t *ptep);
-#endif
-
-#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
-#define hugetlb_prefault_arch_hook(mm)         do { } while (0)
-#else
-void hugetlb_prefault_arch_hook(struct mm_struct *mm);
-#endif
-
-#else /* !CONFIG_HUGETLB_PAGE */
 
-static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
+static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 {
-       return 0;
 }
+
 static inline unsigned long hugetlb_total_pages(void)
 {
        return 0;
 }
 
-#define follow_hugetlb_page(m,v,p,vs,a,b,i)    ({ BUG(); 0; })
+#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)  ({ BUG(); 0; })
 #define follow_huge_addr(mm, addr, write)      ERR_PTR(-EINVAL)
 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
 #define hugetlb_prefault(mapping, vma)         ({ BUG(); 0; })
@@ -113,7 +78,7 @@ static inline unsigned long hugetlb_total_pages(void)
 #define hugetlb_report_meminfo(buf)            0
 #define hugetlb_report_node_meminfo(n, buf)    0
 #define follow_huge_pmd(mm, addr, pmd, write)  NULL
-#define prepare_hugepage_range(addr,len,pgoff) (-EINVAL)
+#define prepare_hugepage_range(addr,len)       (-EINVAL)
 #define pmd_huge(x)    0
 #define is_hugepage_only_range(mm, addr, len)  0
 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
@@ -164,8 +129,10 @@ static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 extern const struct file_operations hugetlbfs_file_operations;
 extern struct vm_operations_struct hugetlb_vm_ops;
 struct file *hugetlb_file_setup(const char *name, size_t);
-int hugetlb_get_quota(struct address_space *mapping);
-void hugetlb_put_quota(struct address_space *mapping);
+int hugetlb_get_quota(struct address_space *mapping, long delta);
+void hugetlb_put_quota(struct address_space *mapping, long delta);
+
+#define BLOCKS_PER_HUGEPAGE    (HPAGE_SIZE / 512)
 
 static inline int is_file_hugepages(struct file *file)
 {