Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
932b18e0 AA |
2 | /* |
3 | * include/linux/userfaultfd_k.h | |
4 | * | |
5 | * Copyright (C) 2015 Red Hat, Inc. | |
6 | * | |
7 | */ | |
8 | ||
9 | #ifndef _LINUX_USERFAULTFD_K_H | |
10 | #define _LINUX_USERFAULTFD_K_H | |
11 | ||
12 | #ifdef CONFIG_USERFAULTFD | |
13 | ||
14 | #include <linux/userfaultfd.h> /* linux/include/uapi/linux/userfaultfd.h */ | |
15 | ||
16 | #include <linux/fcntl.h> | |
17 | ||
18 | /* | |
19 | * CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining | |
20 | * new flags, since they might collide with O_* ones. We want | |
21 | * to re-use O_* flags that couldn't possibly have a meaning | |
22 | * from userfaultfd, in order to leave a free define-space for | |
23 | * shared O_* flags. | |
24 | */ | |
25 | #define UFFD_CLOEXEC O_CLOEXEC | |
26 | #define UFFD_NONBLOCK O_NONBLOCK | |
27 | ||
28 | #define UFFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK) | |
29 | #define UFFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS) | |
30 | ||
82b0f8c3 | 31 | extern int handle_userfault(struct vm_fault *vmf, unsigned long reason); |
932b18e0 | 32 | |
c1a4de99 AA |
33 | extern ssize_t mcopy_atomic(struct mm_struct *dst_mm, unsigned long dst_start, |
34 | unsigned long src_start, unsigned long len); | |
35 | extern ssize_t mfill_zeropage(struct mm_struct *dst_mm, | |
36 | unsigned long dst_start, | |
37 | unsigned long len); | |
38 | ||
932b18e0 AA |
39 | /* mm helpers */ |
40 | static inline bool is_mergeable_vm_userfaultfd_ctx(struct vm_area_struct *vma, | |
41 | struct vm_userfaultfd_ctx vm_ctx) | |
42 | { | |
43 | return vma->vm_userfaultfd_ctx.ctx == vm_ctx.ctx; | |
44 | } | |
45 | ||
46 | static inline bool userfaultfd_missing(struct vm_area_struct *vma) | |
47 | { | |
48 | return vma->vm_flags & VM_UFFD_MISSING; | |
49 | } | |
50 | ||
51 | static inline bool userfaultfd_armed(struct vm_area_struct *vma) | |
52 | { | |
53 | return vma->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP); | |
54 | } | |
55 | ||
893e26e6 PE |
56 | extern int dup_userfaultfd(struct vm_area_struct *, struct list_head *); |
57 | extern void dup_userfaultfd_complete(struct list_head *); | |
58 | ||
72f87654 PE |
59 | extern void mremap_userfaultfd_prep(struct vm_area_struct *, |
60 | struct vm_userfaultfd_ctx *); | |
90794bf1 | 61 | extern void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *, |
72f87654 PE |
62 | unsigned long from, unsigned long to, |
63 | unsigned long len); | |
64 | ||
70ccb92f | 65 | extern bool userfaultfd_remove(struct vm_area_struct *vma, |
d811914d MR |
66 | unsigned long start, |
67 | unsigned long end); | |
05ce7724 | 68 | |
897ab3e0 MR |
69 | extern int userfaultfd_unmap_prep(struct vm_area_struct *vma, |
70 | unsigned long start, unsigned long end, | |
71 | struct list_head *uf); | |
72 | extern void userfaultfd_unmap_complete(struct mm_struct *mm, | |
73 | struct list_head *uf); | |
74 | ||
932b18e0 AA |
75 | #else /* CONFIG_USERFAULTFD */ |
76 | ||
77 | /* mm helpers */ | |
82b0f8c3 | 78 | static inline int handle_userfault(struct vm_fault *vmf, unsigned long reason) |
932b18e0 AA |
79 | { |
80 | return VM_FAULT_SIGBUS; | |
81 | } | |
82 | ||
83 | static inline bool is_mergeable_vm_userfaultfd_ctx(struct vm_area_struct *vma, | |
84 | struct vm_userfaultfd_ctx vm_ctx) | |
85 | { | |
86 | return true; | |
87 | } | |
88 | ||
89 | static inline bool userfaultfd_missing(struct vm_area_struct *vma) | |
90 | { | |
91 | return false; | |
92 | } | |
93 | ||
94 | static inline bool userfaultfd_armed(struct vm_area_struct *vma) | |
95 | { | |
96 | return false; | |
97 | } | |
98 | ||
893e26e6 PE |
99 | static inline int dup_userfaultfd(struct vm_area_struct *vma, |
100 | struct list_head *l) | |
101 | { | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static inline void dup_userfaultfd_complete(struct list_head *l) | |
106 | { | |
107 | } | |
108 | ||
72f87654 PE |
109 | static inline void mremap_userfaultfd_prep(struct vm_area_struct *vma, |
110 | struct vm_userfaultfd_ctx *ctx) | |
111 | { | |
112 | } | |
113 | ||
90794bf1 | 114 | static inline void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *ctx, |
72f87654 PE |
115 | unsigned long from, |
116 | unsigned long to, | |
117 | unsigned long len) | |
118 | { | |
119 | } | |
05ce7724 | 120 | |
70ccb92f | 121 | static inline bool userfaultfd_remove(struct vm_area_struct *vma, |
d811914d MR |
122 | unsigned long start, |
123 | unsigned long end) | |
05ce7724 | 124 | { |
70ccb92f | 125 | return true; |
05ce7724 | 126 | } |
897ab3e0 MR |
127 | |
128 | static inline int userfaultfd_unmap_prep(struct vm_area_struct *vma, | |
129 | unsigned long start, unsigned long end, | |
130 | struct list_head *uf) | |
131 | { | |
132 | return 0; | |
133 | } | |
134 | ||
135 | static inline void userfaultfd_unmap_complete(struct mm_struct *mm, | |
136 | struct list_head *uf) | |
137 | { | |
138 | } | |
ca49ca71 | 139 | |
932b18e0 AA |
140 | #endif /* CONFIG_USERFAULTFD */ |
141 | ||
142 | #endif /* _LINUX_USERFAULTFD_K_H */ |