hugetlb: allow bulk updating in hugetlb_*_quota()
[linux-2.6.git] / include / linux / hugetlb.h
index 42cb7d7..8104e5a 100644 (file)
@@ -1,9 +1,12 @@
 #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>
 
 struct ctl_table;
@@ -14,19 +17,23 @@ static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
 }
 
 int hugetlb_sysctl_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);
-void zap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
+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 *);
 int hugetlb_report_meminfo(char *);
 int hugetlb_report_node_meminfo(int, char *);
-int is_hugepage_mem_enough(size_t);
 unsigned long hugetlb_total_pages(void);
-struct page *alloc_huge_page(void);
-void free_huge_page(struct page *);
+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);
+void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
 
 extern unsigned long max_huge_pages;
+extern unsigned long hugepages_treat_as_movable;
+extern int hugetlb_dynamic_pool;
 extern const unsigned long hugetlb_zero, hugetlb_infinity;
 extern int sysctl_hugetlb_shm_group;
 
@@ -34,22 +41,40 @@ extern int sysctl_hugetlb_shm_group;
 
 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
+int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
                              int write);
 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
                                pmd_t *pmd, int write);
-int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
 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
-#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
-                                               do { } while (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
 
 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
-#define prepare_hugepage_range(addr, len)      \
-       is_aligned_hugepage_range(addr, len)
+/*
+ * 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)
+{
+       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);
 #endif
@@ -81,28 +106,25 @@ 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; })
-#define zap_hugepage_range(vma, start, len)    BUG()
 #define unmap_hugepage_range(vma, start, end)  BUG()
-#define is_hugepage_mem_enough(size)           0
 #define hugetlb_report_meminfo(buf)            0
 #define hugetlb_report_node_meminfo(n, buf)    0
 #define follow_huge_pmd(mm, addr, pmd, write)  NULL
-#define is_aligned_hugepage_range(addr, len)   0
-#define prepare_hugepage_range(addr, len)      (-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) \
-                                               do { } while (0)
-#define alloc_huge_page()                      ({ NULL; })
-#define free_huge_page(p)                      ({ (void)(p); BUG(); })
+#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
+#define hugetlb_fault(mm, vma, addr, write)    ({ BUG(); 0; })
+
+#define hugetlb_change_protection(vma, address, end, newprot)
 
 #ifndef HPAGE_MASK
-#define HPAGE_MASK     0               /* Keep the compiler happy */
-#define HPAGE_SIZE     0
+#define HPAGE_MASK     PAGE_MASK               /* Keep the compiler happy */
+#define HPAGE_SIZE     PAGE_SIZE
 #endif
 
 #endif /* !CONFIG_HUGETLB_PAGE */
@@ -140,40 +162,38 @@ static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
        return sb->s_fs_info;
 }
 
-extern struct file_operations hugetlbfs_file_operations;
+extern const struct file_operations hugetlbfs_file_operations;
 extern struct vm_operations_struct hugetlb_vm_ops;
-struct file *hugetlb_zero_setup(size_t);
-int hugetlb_get_quota(struct address_space *mapping);
-void hugetlb_put_quota(struct address_space *mapping);
+struct file *hugetlb_file_setup(const char *name, size_t);
+int hugetlb_get_quota(struct address_space *mapping, long delta);
+void hugetlb_put_quota(struct address_space *mapping, long delta);
 
 static inline int is_file_hugepages(struct file *file)
 {
-       return file->f_op == &hugetlbfs_file_operations;
+       if (file->f_op == &hugetlbfs_file_operations)
+               return 1;
+       if (is_file_shm_hugepages(file))
+               return 1;
+
+       return 0;
 }
 
 static inline void set_file_hugepages(struct file *file)
 {
        file->f_op = &hugetlbfs_file_operations;
 }
-
-static inline int valid_hugetlb_file_off(struct vm_area_struct *vma, 
-                                         unsigned long address) 
-{
-       struct inode *inode = vma->vm_file->f_dentry->d_inode;
-       loff_t file_off = address - vma->vm_start;
-       
-       file_off += (vma->vm_pgoff << PAGE_SHIFT);
-       
-       return (file_off < inode->i_size);
-}
-
 #else /* !CONFIG_HUGETLBFS */
 
 #define is_file_hugepages(file)                0
 #define set_file_hugepages(file)       BUG()
-#define hugetlb_zero_setup(size)       ERR_PTR(-ENOSYS)
-#define valid_hugetlb_file_off(vma, address)   0
+#define hugetlb_file_setup(name,size)  ERR_PTR(-ENOSYS)
 
 #endif /* !CONFIG_HUGETLBFS */
 
+#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);
+#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
+
 #endif /* _LINUX_HUGETLB_H */