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 | ||
cefdca0a PX |
31 | extern int sysctl_unprivileged_userfaultfd; |
32 | ||
2b740303 | 33 | extern vm_fault_t handle_userfault(struct vm_fault *vmf, unsigned long reason); |
932b18e0 | 34 | |
c1a4de99 | 35 | extern ssize_t mcopy_atomic(struct mm_struct *dst_mm, unsigned long dst_start, |
df2cc96e MR |
36 | unsigned long src_start, unsigned long len, |
37 | bool *mmap_changing); | |
c1a4de99 AA |
38 | extern ssize_t mfill_zeropage(struct mm_struct *dst_mm, |
39 | unsigned long dst_start, | |
df2cc96e MR |
40 | unsigned long len, |
41 | bool *mmap_changing); | |
c1a4de99 | 42 | |
932b18e0 AA |
43 | /* mm helpers */ |
44 | static inline bool is_mergeable_vm_userfaultfd_ctx(struct vm_area_struct *vma, | |
45 | struct vm_userfaultfd_ctx vm_ctx) | |
46 | { | |
47 | return vma->vm_userfaultfd_ctx.ctx == vm_ctx.ctx; | |
48 | } | |
49 | ||
50 | static inline bool userfaultfd_missing(struct vm_area_struct *vma) | |
51 | { | |
52 | return vma->vm_flags & VM_UFFD_MISSING; | |
53 | } | |
54 | ||
55 | static inline bool userfaultfd_armed(struct vm_area_struct *vma) | |
56 | { | |
57 | return vma->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP); | |
58 | } | |
59 | ||
893e26e6 PE |
60 | extern int dup_userfaultfd(struct vm_area_struct *, struct list_head *); |
61 | extern void dup_userfaultfd_complete(struct list_head *); | |
62 | ||
72f87654 PE |
63 | extern void mremap_userfaultfd_prep(struct vm_area_struct *, |
64 | struct vm_userfaultfd_ctx *); | |
90794bf1 | 65 | extern void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *, |
72f87654 PE |
66 | unsigned long from, unsigned long to, |
67 | unsigned long len); | |
68 | ||
70ccb92f | 69 | extern bool userfaultfd_remove(struct vm_area_struct *vma, |
d811914d MR |
70 | unsigned long start, |
71 | unsigned long end); | |
05ce7724 | 72 | |
897ab3e0 MR |
73 | extern int userfaultfd_unmap_prep(struct vm_area_struct *vma, |
74 | unsigned long start, unsigned long end, | |
75 | struct list_head *uf); | |
76 | extern void userfaultfd_unmap_complete(struct mm_struct *mm, | |
77 | struct list_head *uf); | |
78 | ||
932b18e0 AA |
79 | #else /* CONFIG_USERFAULTFD */ |
80 | ||
81 | /* mm helpers */ | |
2b740303 SJ |
82 | static inline vm_fault_t handle_userfault(struct vm_fault *vmf, |
83 | unsigned long reason) | |
932b18e0 AA |
84 | { |
85 | return VM_FAULT_SIGBUS; | |
86 | } | |
87 | ||
88 | static inline bool is_mergeable_vm_userfaultfd_ctx(struct vm_area_struct *vma, | |
89 | struct vm_userfaultfd_ctx vm_ctx) | |
90 | { | |
91 | return true; | |
92 | } | |
93 | ||
94 | static inline bool userfaultfd_missing(struct vm_area_struct *vma) | |
95 | { | |
96 | return false; | |
97 | } | |
98 | ||
99 | static inline bool userfaultfd_armed(struct vm_area_struct *vma) | |
100 | { | |
101 | return false; | |
102 | } | |
103 | ||
893e26e6 PE |
104 | static inline int dup_userfaultfd(struct vm_area_struct *vma, |
105 | struct list_head *l) | |
106 | { | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static inline void dup_userfaultfd_complete(struct list_head *l) | |
111 | { | |
112 | } | |
113 | ||
72f87654 PE |
114 | static inline void mremap_userfaultfd_prep(struct vm_area_struct *vma, |
115 | struct vm_userfaultfd_ctx *ctx) | |
116 | { | |
117 | } | |
118 | ||
90794bf1 | 119 | static inline void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *ctx, |
72f87654 PE |
120 | unsigned long from, |
121 | unsigned long to, | |
122 | unsigned long len) | |
123 | { | |
124 | } | |
05ce7724 | 125 | |
70ccb92f | 126 | static inline bool userfaultfd_remove(struct vm_area_struct *vma, |
d811914d MR |
127 | unsigned long start, |
128 | unsigned long end) | |
05ce7724 | 129 | { |
70ccb92f | 130 | return true; |
05ce7724 | 131 | } |
897ab3e0 MR |
132 | |
133 | static inline int userfaultfd_unmap_prep(struct vm_area_struct *vma, | |
134 | unsigned long start, unsigned long end, | |
135 | struct list_head *uf) | |
136 | { | |
137 | return 0; | |
138 | } | |
139 | ||
140 | static inline void userfaultfd_unmap_complete(struct mm_struct *mm, | |
141 | struct list_head *uf) | |
142 | { | |
143 | } | |
ca49ca71 | 144 | |
932b18e0 AA |
145 | #endif /* CONFIG_USERFAULTFD */ |
146 | ||
147 | #endif /* _LINUX_USERFAULTFD_K_H */ |