1 #ifndef _LINUX_MMAP_LOCK_H 1 #ifndef _LINUX_MMAP_LOCK_H
2 #define _LINUX_MMAP_LOCK_H 2 #define _LINUX_MMAP_LOCK_H
3 3
4 #include <linux/lockdep.h> 4 #include <linux/lockdep.h>
5 #include <linux/mm_types.h> 5 #include <linux/mm_types.h>
6 #include <linux/mmdebug.h> 6 #include <linux/mmdebug.h>
7 #include <linux/rwsem.h> 7 #include <linux/rwsem.h>
8 #include <linux/tracepoint-defs.h> 8 #include <linux/tracepoint-defs.h>
9 #include <linux/types.h> 9 #include <linux/types.h>
10 10
11 #define MMAP_LOCK_INITIALIZER(name) \ 11 #define MMAP_LOCK_INITIALIZER(name) \
12 .mmap_lock = __RWSEM_INITIALIZER((name 12 .mmap_lock = __RWSEM_INITIALIZER((name).mmap_lock),
13 13
14 DECLARE_TRACEPOINT(mmap_lock_start_locking); 14 DECLARE_TRACEPOINT(mmap_lock_start_locking);
15 DECLARE_TRACEPOINT(mmap_lock_acquire_returned) 15 DECLARE_TRACEPOINT(mmap_lock_acquire_returned);
16 DECLARE_TRACEPOINT(mmap_lock_released); 16 DECLARE_TRACEPOINT(mmap_lock_released);
17 17
18 #ifdef CONFIG_TRACING 18 #ifdef CONFIG_TRACING
19 19
20 void __mmap_lock_do_trace_start_locking(struct 20 void __mmap_lock_do_trace_start_locking(struct mm_struct *mm, bool write);
21 void __mmap_lock_do_trace_acquire_returned(str 21 void __mmap_lock_do_trace_acquire_returned(struct mm_struct *mm, bool write,
22 boo 22 bool success);
23 void __mmap_lock_do_trace_released(struct mm_s 23 void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write);
24 24
25 static inline void __mmap_lock_trace_start_loc 25 static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm,
26 26 bool write)
27 { 27 {
28 if (tracepoint_enabled(mmap_lock_start 28 if (tracepoint_enabled(mmap_lock_start_locking))
29 __mmap_lock_do_trace_start_loc 29 __mmap_lock_do_trace_start_locking(mm, write);
30 } 30 }
31 31
32 static inline void __mmap_lock_trace_acquire_r 32 static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm,
33 33 bool write, bool success)
34 { 34 {
35 if (tracepoint_enabled(mmap_lock_acqui 35 if (tracepoint_enabled(mmap_lock_acquire_returned))
36 __mmap_lock_do_trace_acquire_r 36 __mmap_lock_do_trace_acquire_returned(mm, write, success);
37 } 37 }
38 38
39 static inline void __mmap_lock_trace_released( 39 static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
40 { 40 {
41 if (tracepoint_enabled(mmap_lock_relea 41 if (tracepoint_enabled(mmap_lock_released))
42 __mmap_lock_do_trace_released( 42 __mmap_lock_do_trace_released(mm, write);
43 } 43 }
44 44
45 #else /* !CONFIG_TRACING */ 45 #else /* !CONFIG_TRACING */
46 46
47 static inline void __mmap_lock_trace_start_loc 47 static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm,
48 48 bool write)
49 { 49 {
50 } 50 }
51 51
52 static inline void __mmap_lock_trace_acquire_r 52 static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm,
53 53 bool write, bool success)
54 { 54 {
55 } 55 }
56 56
57 static inline void __mmap_lock_trace_released( 57 static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
58 { 58 {
59 } 59 }
60 60
61 #endif /* CONFIG_TRACING */ 61 #endif /* CONFIG_TRACING */
62 62
63 static inline void mmap_assert_locked(const st <<
64 { <<
65 rwsem_assert_held(&mm->mmap_lock); <<
66 } <<
67 <<
68 static inline void mmap_assert_write_locked(co <<
69 { <<
70 rwsem_assert_held_write(&mm->mmap_lock <<
71 } <<
72 <<
73 #ifdef CONFIG_PER_VMA_LOCK <<
74 /* <<
75 * Drop all currently-held per-VMA locks. <<
76 * This is called from the mmap_lock implement <<
77 * a write-locked mmap_lock (or downgrading it <<
78 * This should normally NOT be called manually <<
79 * If you want to call this manually anyway, k <<
80 * *all* VMA write locks, including ones from <<
81 */ <<
82 static inline void vma_end_write_all(struct mm <<
83 { <<
84 mmap_assert_write_locked(mm); <<
85 /* <<
86 * Nobody can concurrently modify mm-> <<
87 * mmap_lock being held. <<
88 * We need RELEASE semantics here to e <<
89 * the VMA take effect before we unloc <<
90 * Pairs with ACQUIRE semantics in vma <<
91 */ <<
92 smp_store_release(&mm->mm_lock_seq, mm <<
93 } <<
94 #else <<
95 static inline void vma_end_write_all(struct mm <<
96 #endif <<
97 <<
98 static inline void mmap_init_lock(struct mm_st 63 static inline void mmap_init_lock(struct mm_struct *mm)
99 { 64 {
100 init_rwsem(&mm->mmap_lock); 65 init_rwsem(&mm->mmap_lock);
101 } 66 }
102 67
103 static inline void mmap_write_lock(struct mm_s 68 static inline void mmap_write_lock(struct mm_struct *mm)
104 { 69 {
105 __mmap_lock_trace_start_locking(mm, tr 70 __mmap_lock_trace_start_locking(mm, true);
106 down_write(&mm->mmap_lock); 71 down_write(&mm->mmap_lock);
107 __mmap_lock_trace_acquire_returned(mm, 72 __mmap_lock_trace_acquire_returned(mm, true, true);
108 } 73 }
109 74
110 static inline void mmap_write_lock_nested(stru 75 static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
111 { 76 {
112 __mmap_lock_trace_start_locking(mm, tr 77 __mmap_lock_trace_start_locking(mm, true);
113 down_write_nested(&mm->mmap_lock, subc 78 down_write_nested(&mm->mmap_lock, subclass);
114 __mmap_lock_trace_acquire_returned(mm, 79 __mmap_lock_trace_acquire_returned(mm, true, true);
115 } 80 }
116 81
117 static inline int mmap_write_lock_killable(str 82 static inline int mmap_write_lock_killable(struct mm_struct *mm)
118 { 83 {
119 int ret; 84 int ret;
120 85
121 __mmap_lock_trace_start_locking(mm, tr 86 __mmap_lock_trace_start_locking(mm, true);
122 ret = down_write_killable(&mm->mmap_lo 87 ret = down_write_killable(&mm->mmap_lock);
123 __mmap_lock_trace_acquire_returned(mm, 88 __mmap_lock_trace_acquire_returned(mm, true, ret == 0);
124 return ret; 89 return ret;
125 } 90 }
126 91
>> 92 static inline bool mmap_write_trylock(struct mm_struct *mm)
>> 93 {
>> 94 bool ret;
>> 95
>> 96 __mmap_lock_trace_start_locking(mm, true);
>> 97 ret = down_write_trylock(&mm->mmap_lock) != 0;
>> 98 __mmap_lock_trace_acquire_returned(mm, true, ret);
>> 99 return ret;
>> 100 }
>> 101
127 static inline void mmap_write_unlock(struct mm 102 static inline void mmap_write_unlock(struct mm_struct *mm)
128 { 103 {
129 __mmap_lock_trace_released(mm, true); 104 __mmap_lock_trace_released(mm, true);
130 vma_end_write_all(mm); <<
131 up_write(&mm->mmap_lock); 105 up_write(&mm->mmap_lock);
132 } 106 }
133 107
134 static inline void mmap_write_downgrade(struct 108 static inline void mmap_write_downgrade(struct mm_struct *mm)
135 { 109 {
136 __mmap_lock_trace_acquire_returned(mm, 110 __mmap_lock_trace_acquire_returned(mm, false, true);
137 vma_end_write_all(mm); <<
138 downgrade_write(&mm->mmap_lock); 111 downgrade_write(&mm->mmap_lock);
139 } 112 }
140 113
141 static inline void mmap_read_lock(struct mm_st 114 static inline void mmap_read_lock(struct mm_struct *mm)
142 { 115 {
143 __mmap_lock_trace_start_locking(mm, fa 116 __mmap_lock_trace_start_locking(mm, false);
144 down_read(&mm->mmap_lock); 117 down_read(&mm->mmap_lock);
145 __mmap_lock_trace_acquire_returned(mm, 118 __mmap_lock_trace_acquire_returned(mm, false, true);
146 } 119 }
147 120
148 static inline int mmap_read_lock_killable(stru 121 static inline int mmap_read_lock_killable(struct mm_struct *mm)
149 { 122 {
150 int ret; 123 int ret;
151 124
152 __mmap_lock_trace_start_locking(mm, fa 125 __mmap_lock_trace_start_locking(mm, false);
153 ret = down_read_killable(&mm->mmap_loc 126 ret = down_read_killable(&mm->mmap_lock);
154 __mmap_lock_trace_acquire_returned(mm, 127 __mmap_lock_trace_acquire_returned(mm, false, ret == 0);
155 return ret; 128 return ret;
156 } 129 }
157 130
158 static inline bool mmap_read_trylock(struct mm 131 static inline bool mmap_read_trylock(struct mm_struct *mm)
159 { 132 {
160 bool ret; 133 bool ret;
161 134
162 __mmap_lock_trace_start_locking(mm, fa 135 __mmap_lock_trace_start_locking(mm, false);
163 ret = down_read_trylock(&mm->mmap_lock 136 ret = down_read_trylock(&mm->mmap_lock) != 0;
164 __mmap_lock_trace_acquire_returned(mm, 137 __mmap_lock_trace_acquire_returned(mm, false, ret);
165 return ret; 138 return ret;
166 } 139 }
167 140
168 static inline void mmap_read_unlock(struct mm_ 141 static inline void mmap_read_unlock(struct mm_struct *mm)
169 { 142 {
170 __mmap_lock_trace_released(mm, false); 143 __mmap_lock_trace_released(mm, false);
171 up_read(&mm->mmap_lock); 144 up_read(&mm->mmap_lock);
172 } 145 }
173 146
174 static inline void mmap_read_unlock_non_owner( 147 static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
175 { 148 {
176 __mmap_lock_trace_released(mm, false); 149 __mmap_lock_trace_released(mm, false);
177 up_read_non_owner(&mm->mmap_lock); 150 up_read_non_owner(&mm->mmap_lock);
>> 151 }
>> 152
>> 153 static inline void mmap_assert_locked(struct mm_struct *mm)
>> 154 {
>> 155 lockdep_assert_held(&mm->mmap_lock);
>> 156 VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
>> 157 }
>> 158
>> 159 static inline void mmap_assert_write_locked(struct mm_struct *mm)
>> 160 {
>> 161 lockdep_assert_held_write(&mm->mmap_lock);
>> 162 VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
178 } 163 }
179 164
180 static inline int mmap_lock_is_contended(struc 165 static inline int mmap_lock_is_contended(struct mm_struct *mm)
181 { 166 {
182 return rwsem_is_contended(&mm->mmap_lo 167 return rwsem_is_contended(&mm->mmap_lock);
183 } 168 }
184 169
185 #endif /* _LINUX_MMAP_LOCK_H */ 170 #endif /* _LINUX_MMAP_LOCK_H */
186 171
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