dax: Use radix tree entry lock to protect cow faults

[sfrench/cifs-2.6.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ffcff53e3b2b05d77db7a6e3a47a33842a3fc5e5..0ef9dc720ec3b023f51cdc37060a48eb3e9ab1b1 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -299,6 +299,12 @@ struct vm_fault {
                                         * is set (which is also implied by
                                         * VM_FAULT_ERROR).
                                         */
+       void *entry;                    /* ->fault handler can alternatively
+                                        * return locked DAX entry. In that
+                                        * case handler should return
+                                        * VM_FAULT_DAX_LOCKED and fill in
+                                        * entry here.
+                                        */
        /* for ->map_pages() only */
        pgoff_t max_pgoff;              /* map pages for offset from pgoff till
                                         * max_pgoff inclusive */
@@ -1084,6 +1090,7 @@ static inline void clear_page_pfmemalloc(struct page *page)
 #define VM_FAULT_LOCKED        0x0200  /* ->fault locked the returned page */
 #define VM_FAULT_RETRY 0x0400  /* ->fault blocked, must retry */
 #define VM_FAULT_FALLBACK 0x0800       /* huge page fault failed, fall back to small */
+#define VM_FAULT_DAX_LOCKED 0x1000     /* ->fault has locked DAX entry */
 
 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
 
@@ -1250,78 +1257,20 @@ long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
                            unsigned long start, unsigned long nr_pages,
                            int write, int force, struct page **pages,
                            struct vm_area_struct **vmas);
-long get_user_pages6(unsigned long start, unsigned long nr_pages,
+long get_user_pages(unsigned long start, unsigned long nr_pages,
                            int write, int force, struct page **pages,
                            struct vm_area_struct **vmas);
-long get_user_pages_locked6(unsigned long start, unsigned long nr_pages,
+long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
                    int write, int force, struct page **pages, int *locked);
 long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
                               unsigned long start, unsigned long nr_pages,
                               int write, int force, struct page **pages,
                               unsigned int gup_flags);
-long get_user_pages_unlocked5(unsigned long start, unsigned long nr_pages,
+long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
                    int write, int force, struct page **pages);
 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
                        struct page **pages);
 
-/* suppress warnings from use in EXPORT_SYMBOL() */
-#ifndef __DISABLE_GUP_DEPRECATED
-#define __gup_deprecated __deprecated
-#else
-#define __gup_deprecated
-#endif
-/*
- * These macros provide backward-compatibility with the old
- * get_user_pages() variants which took tsk/mm.  These
- * functions/macros provide both compile-time __deprecated so we
- * can catch old-style use and not break the build.  The actual
- * functions also have WARN_ON()s to let us know at runtime if
- * the get_user_pages() should have been the "remote" variant.
- *
- * These are hideous, but temporary.
- *
- * If you run into one of these __deprecated warnings, look
- * at how you are calling get_user_pages().  If you are calling
- * it with current/current->mm as the first two arguments,
- * simply remove those arguments.  The behavior will be the same
- * as it is now.  If you are calling it on another task, use
- * get_user_pages_remote() instead.
- *
- * Any questions?  Ask Dave Hansen <dave@sr71.net>
- */
-long
-__gup_deprecated
-get_user_pages8(struct task_struct *tsk, struct mm_struct *mm,
-               unsigned long start, unsigned long nr_pages,
-               int write, int force, struct page **pages,
-               struct vm_area_struct **vmas);
-#define GUP_MACRO(_1, _2, _3, _4, _5, _6, _7, _8, get_user_pages, ...) \
-       get_user_pages
-#define get_user_pages(...) GUP_MACRO(__VA_ARGS__,     \
-               get_user_pages8, x,                     \
-               get_user_pages6, x, x, x, x, x)(__VA_ARGS__)
-
-__gup_deprecated
-long get_user_pages_locked8(struct task_struct *tsk, struct mm_struct *mm,
-               unsigned long start, unsigned long nr_pages,
-               int write, int force, struct page **pages,
-               int *locked);
-#define GUPL_MACRO(_1, _2, _3, _4, _5, _6, _7, _8, get_user_pages_locked, ...) \
-       get_user_pages_locked
-#define get_user_pages_locked(...) GUPL_MACRO(__VA_ARGS__,     \
-               get_user_pages_locked8, x,                      \
-               get_user_pages_locked6, x, x, x, x)(__VA_ARGS__)
-
-__gup_deprecated
-long get_user_pages_unlocked7(struct task_struct *tsk, struct mm_struct *mm,
-               unsigned long start, unsigned long nr_pages,
-               int write, int force, struct page **pages);
-#define GUPU_MACRO(_1, _2, _3, _4, _5, _6, _7, get_user_pages_unlocked, ...)   \
-       get_user_pages_unlocked
-#define get_user_pages_unlocked(...) GUPU_MACRO(__VA_ARGS__,   \
-               get_user_pages_unlocked7, x,                    \
-               get_user_pages_unlocked5, x, x, x, x)(__VA_ARGS__)
-
 /* Container for pinned pfns / pages */
 struct frame_vector {
        unsigned int nr_allocated;      /* Number of frames we have space for */