Line data Source code
1 : #ifndef _LINUX_MMAP_LOCK_H
2 : #define _LINUX_MMAP_LOCK_H
3 :
4 : #include <linux/lockdep.h>
5 : #include <linux/mm_types.h>
6 : #include <linux/mmdebug.h>
7 : #include <linux/rwsem.h>
8 : #include <linux/tracepoint-defs.h>
9 : #include <linux/types.h>
10 :
11 : #define MMAP_LOCK_INITIALIZER(name) \
12 : .mmap_lock = __RWSEM_INITIALIZER((name).mmap_lock),
13 :
14 : DECLARE_TRACEPOINT(mmap_lock_start_locking);
15 : DECLARE_TRACEPOINT(mmap_lock_acquire_returned);
16 : DECLARE_TRACEPOINT(mmap_lock_released);
17 :
18 : #ifdef CONFIG_TRACING
19 :
20 : void __mmap_lock_do_trace_start_locking(struct mm_struct *mm, bool write);
21 : void __mmap_lock_do_trace_acquire_returned(struct mm_struct *mm, bool write,
22 : bool success);
23 : void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write);
24 :
25 282070352 : static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm,
26 : bool write)
27 : {
28 282070352 : if (tracepoint_enabled(mmap_lock_start_locking))
29 0 : __mmap_lock_do_trace_start_locking(mm, write);
30 282110389 : }
31 :
32 321371602 : static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm,
33 : bool write, bool success)
34 : {
35 321371602 : if (tracepoint_enabled(mmap_lock_acquire_returned))
36 0 : __mmap_lock_do_trace_acquire_returned(mm, write, success);
37 321371098 : }
38 :
39 289316084 : static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
40 : {
41 289316084 : if (tracepoint_enabled(mmap_lock_released))
42 0 : __mmap_lock_do_trace_released(mm, write);
43 289313822 : }
44 :
45 : #else /* !CONFIG_TRACING */
46 :
47 : static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm,
48 : bool write)
49 : {
50 : }
51 :
52 : static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm,
53 : bool write, bool success)
54 : {
55 : }
56 :
57 : static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
58 : {
59 : }
60 :
61 : #endif /* CONFIG_TRACING */
62 :
63 : static inline void mmap_assert_locked(struct mm_struct *mm)
64 : {
65 : lockdep_assert_held(&mm->mmap_lock);
66 : VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
67 : }
68 :
69 : static inline void mmap_assert_write_locked(struct mm_struct *mm)
70 : {
71 : lockdep_assert_held_write(&mm->mmap_lock);
72 : VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
73 : }
74 :
75 : #ifdef CONFIG_PER_VMA_LOCK
76 : static inline void vma_end_write_all(struct mm_struct *mm)
77 : {
78 140883361 : mmap_assert_write_locked(mm);
79 : /* No races during update due to exclusive mmap_lock being held */
80 140883361 : WRITE_ONCE(mm->mm_lock_seq, mm->mm_lock_seq + 1);
81 : }
82 : #else
83 : static inline void vma_end_write_all(struct mm_struct *mm) {}
84 : #endif
85 :
86 : static inline void mmap_init_lock(struct mm_struct *mm)
87 : {
88 : init_rwsem(&mm->mmap_lock);
89 : }
90 :
91 39262550 : static inline void mmap_write_lock(struct mm_struct *mm)
92 : {
93 39262550 : __mmap_lock_trace_start_locking(mm, true);
94 39265119 : down_write(&mm->mmap_lock);
95 39267563 : __mmap_lock_trace_acquire_returned(mm, true, true);
96 39266236 : }
97 :
98 : static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
99 : {
100 : __mmap_lock_trace_start_locking(mm, true);
101 : down_write_nested(&mm->mmap_lock, subclass);
102 : __mmap_lock_trace_acquire_returned(mm, true, true);
103 : }
104 :
105 101682042 : static inline int mmap_write_lock_killable(struct mm_struct *mm)
106 : {
107 101682042 : int ret;
108 :
109 101682042 : __mmap_lock_trace_start_locking(mm, true);
110 101679253 : ret = down_write_killable(&mm->mmap_lock);
111 101690470 : __mmap_lock_trace_acquire_returned(mm, true, ret == 0);
112 101686919 : return ret;
113 : }
114 :
115 : static inline bool mmap_write_trylock(struct mm_struct *mm)
116 : {
117 : bool ret;
118 :
119 : __mmap_lock_trace_start_locking(mm, true);
120 : ret = down_write_trylock(&mm->mmap_lock) != 0;
121 : __mmap_lock_trace_acquire_returned(mm, true, ret);
122 : return ret;
123 : }
124 :
125 101654428 : static inline void mmap_write_unlock(struct mm_struct *mm)
126 : {
127 101654428 : __mmap_lock_trace_released(mm, true);
128 101630289 : vma_end_write_all(mm);
129 101630289 : up_write(&mm->mmap_lock);
130 101651002 : }
131 :
132 39257515 : static inline void mmap_write_downgrade(struct mm_struct *mm)
133 : {
134 39257515 : __mmap_lock_trace_acquire_returned(mm, false, true);
135 39253072 : vma_end_write_all(mm);
136 39253072 : downgrade_write(&mm->mmap_lock);
137 39253152 : }
138 :
139 109015920 : static inline void mmap_read_lock(struct mm_struct *mm)
140 : {
141 109015920 : __mmap_lock_trace_start_locking(mm, false);
142 109007580 : down_read(&mm->mmap_lock);
143 109018619 : __mmap_lock_trace_acquire_returned(mm, false, true);
144 109012138 : }
145 :
146 32166299 : static inline int mmap_read_lock_killable(struct mm_struct *mm)
147 : {
148 32166299 : int ret;
149 :
150 32166299 : __mmap_lock_trace_start_locking(mm, false);
151 32162603 : ret = down_read_killable(&mm->mmap_lock);
152 32165392 : __mmap_lock_trace_acquire_returned(mm, false, ret == 0);
153 32161588 : return ret;
154 : }
155 :
156 : static inline bool mmap_read_trylock(struct mm_struct *mm)
157 : {
158 : bool ret;
159 :
160 : __mmap_lock_trace_start_locking(mm, false);
161 : ret = down_read_trylock(&mm->mmap_lock) != 0;
162 : __mmap_lock_trace_acquire_returned(mm, false, ret);
163 : return ret;
164 : }
165 :
166 187692005 : static inline void mmap_read_unlock(struct mm_struct *mm)
167 : {
168 187692005 : __mmap_lock_trace_released(mm, false);
169 187674157 : up_read(&mm->mmap_lock);
170 187688067 : }
171 :
172 : static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
173 : {
174 : __mmap_lock_trace_released(mm, false);
175 : up_read_non_owner(&mm->mmap_lock);
176 : }
177 :
178 : static inline int mmap_lock_is_contended(struct mm_struct *mm)
179 : {
180 : return rwsem_is_contended(&mm->mmap_lock);
181 : }
182 :
183 : #endif /* _LINUX_MMAP_LOCK_H */
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