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Commit | Line | Data |
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1da177e4 LT |
1 | |
2 | #include <linux/mm.h> | |
3 | #include <linux/file.h> | |
4 | #include <linux/mount.h> | |
5096add8 | 5 | #include <linux/ptrace.h> |
1da177e4 LT |
6 | #include <linux/seq_file.h> |
7 | #include "internal.h" | |
8 | ||
9 | /* | |
10 | * Logic: we've got two memory sums for each process, "shared", and | |
11 | * "non-shared". Shared memory may get counted more then once, for | |
12 | * each process that owns it. Non-shared memory is counted | |
13 | * accurately. | |
14 | */ | |
df5f8314 | 15 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 LT |
16 | { |
17 | struct vm_list_struct *vml; | |
18 | unsigned long bytes = 0, sbytes = 0, slack = 0; | |
19 | ||
20 | down_read(&mm->mmap_sem); | |
21 | for (vml = mm->context.vmlist; vml; vml = vml->next) { | |
22 | if (!vml->vma) | |
23 | continue; | |
24 | ||
25 | bytes += kobjsize(vml); | |
26 | if (atomic_read(&mm->mm_count) > 1 || | |
27 | atomic_read(&vml->vma->vm_usage) > 1 | |
28 | ) { | |
29 | sbytes += kobjsize((void *) vml->vma->vm_start); | |
30 | sbytes += kobjsize(vml->vma); | |
31 | } else { | |
32 | bytes += kobjsize((void *) vml->vma->vm_start); | |
33 | bytes += kobjsize(vml->vma); | |
34 | slack += kobjsize((void *) vml->vma->vm_start) - | |
35 | (vml->vma->vm_end - vml->vma->vm_start); | |
36 | } | |
37 | } | |
38 | ||
39 | if (atomic_read(&mm->mm_count) > 1) | |
40 | sbytes += kobjsize(mm); | |
41 | else | |
42 | bytes += kobjsize(mm); | |
43 | ||
44 | if (current->fs && atomic_read(¤t->fs->count) > 1) | |
45 | sbytes += kobjsize(current->fs); | |
46 | else | |
47 | bytes += kobjsize(current->fs); | |
48 | ||
49 | if (current->files && atomic_read(¤t->files->count) > 1) | |
50 | sbytes += kobjsize(current->files); | |
51 | else | |
52 | bytes += kobjsize(current->files); | |
53 | ||
54 | if (current->sighand && atomic_read(¤t->sighand->count) > 1) | |
55 | sbytes += kobjsize(current->sighand); | |
56 | else | |
57 | bytes += kobjsize(current->sighand); | |
58 | ||
59 | bytes += kobjsize(current); /* includes kernel stack */ | |
60 | ||
df5f8314 | 61 | seq_printf(m, |
1da177e4 LT |
62 | "Mem:\t%8lu bytes\n" |
63 | "Slack:\t%8lu bytes\n" | |
64 | "Shared:\t%8lu bytes\n", | |
65 | bytes, slack, sbytes); | |
66 | ||
67 | up_read(&mm->mmap_sem); | |
1da177e4 LT |
68 | } |
69 | ||
70 | unsigned long task_vsize(struct mm_struct *mm) | |
71 | { | |
72 | struct vm_list_struct *tbp; | |
73 | unsigned long vsize = 0; | |
74 | ||
75 | down_read(&mm->mmap_sem); | |
76 | for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) { | |
77 | if (tbp->vma) | |
78 | vsize += kobjsize((void *) tbp->vma->vm_start); | |
79 | } | |
80 | up_read(&mm->mmap_sem); | |
81 | return vsize; | |
82 | } | |
83 | ||
84 | int task_statm(struct mm_struct *mm, int *shared, int *text, | |
85 | int *data, int *resident) | |
86 | { | |
87 | struct vm_list_struct *tbp; | |
88 | int size = kobjsize(mm); | |
89 | ||
90 | down_read(&mm->mmap_sem); | |
91 | for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) { | |
92 | size += kobjsize(tbp); | |
93 | if (tbp->vma) { | |
94 | size += kobjsize(tbp->vma); | |
95 | size += kobjsize((void *) tbp->vma->vm_start); | |
96 | } | |
97 | } | |
98 | ||
99 | size += (*text = mm->end_code - mm->start_code); | |
100 | size += (*data = mm->start_stack - mm->start_data); | |
101 | up_read(&mm->mmap_sem); | |
102 | *resident = size; | |
103 | return size; | |
104 | } | |
105 | ||
3dcd25f3 | 106 | int proc_exe_link(struct inode *inode, struct path *path) |
1da177e4 LT |
107 | { |
108 | struct vm_list_struct *vml; | |
109 | struct vm_area_struct *vma; | |
31304c90 | 110 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
111 | struct mm_struct *mm = get_task_mm(task); |
112 | int result = -ENOENT; | |
113 | ||
114 | if (!mm) | |
115 | goto out; | |
116 | down_read(&mm->mmap_sem); | |
117 | ||
118 | vml = mm->context.vmlist; | |
119 | vma = NULL; | |
120 | while (vml) { | |
121 | if ((vml->vma->vm_flags & VM_EXECUTABLE) && vml->vma->vm_file) { | |
122 | vma = vml->vma; | |
123 | break; | |
124 | } | |
125 | vml = vml->next; | |
126 | } | |
127 | ||
128 | if (vma) { | |
3dcd25f3 JB |
129 | *path = vma->vm_file->f_path; |
130 | path_get(&vma->vm_file->f_path); | |
1da177e4 LT |
131 | result = 0; |
132 | } | |
133 | ||
134 | up_read(&mm->mmap_sem); | |
135 | mmput(mm); | |
136 | out: | |
137 | return result; | |
138 | } | |
139 | ||
140 | /* | |
dbf8685c | 141 | * display mapping lines for a particular process's /proc/pid/maps |
1da177e4 | 142 | */ |
dbf8685c | 143 | static int show_map(struct seq_file *m, void *_vml) |
1da177e4 | 144 | { |
dbf8685c | 145 | struct vm_list_struct *vml = _vml; |
5096add8 KC |
146 | struct proc_maps_private *priv = m->private; |
147 | struct task_struct *task = priv->task; | |
148 | ||
149 | if (maps_protect && !ptrace_may_attach(task)) | |
150 | return -EACCES; | |
151 | ||
dbf8685c | 152 | return nommu_vma_show(m, vml->vma); |
1da177e4 | 153 | } |
dbf8685c | 154 | |
1da177e4 LT |
155 | static void *m_start(struct seq_file *m, loff_t *pos) |
156 | { | |
dbf8685c DH |
157 | struct proc_maps_private *priv = m->private; |
158 | struct vm_list_struct *vml; | |
159 | struct mm_struct *mm; | |
160 | loff_t n = *pos; | |
161 | ||
162 | /* pin the task and mm whilst we play with them */ | |
163 | priv->task = get_pid_task(priv->pid, PIDTYPE_PID); | |
164 | if (!priv->task) | |
165 | return NULL; | |
166 | ||
831830b5 | 167 | mm = mm_for_maps(priv->task); |
dbf8685c DH |
168 | if (!mm) { |
169 | put_task_struct(priv->task); | |
170 | priv->task = NULL; | |
171 | return NULL; | |
172 | } | |
173 | ||
dbf8685c DH |
174 | /* start from the Nth VMA */ |
175 | for (vml = mm->context.vmlist; vml; vml = vml->next) | |
176 | if (n-- == 0) | |
177 | return vml; | |
1da177e4 LT |
178 | return NULL; |
179 | } | |
dbf8685c DH |
180 | |
181 | static void m_stop(struct seq_file *m, void *_vml) | |
1da177e4 | 182 | { |
dbf8685c DH |
183 | struct proc_maps_private *priv = m->private; |
184 | ||
185 | if (priv->task) { | |
186 | struct mm_struct *mm = priv->task->mm; | |
187 | up_read(&mm->mmap_sem); | |
188 | mmput(mm); | |
189 | put_task_struct(priv->task); | |
190 | } | |
1da177e4 | 191 | } |
dbf8685c DH |
192 | |
193 | static void *m_next(struct seq_file *m, void *_vml, loff_t *pos) | |
1da177e4 | 194 | { |
dbf8685c DH |
195 | struct vm_list_struct *vml = _vml; |
196 | ||
197 | (*pos)++; | |
198 | return vml ? vml->next : NULL; | |
1da177e4 | 199 | } |
dbf8685c | 200 | |
03a44825 | 201 | static const struct seq_operations proc_pid_maps_ops = { |
1da177e4 LT |
202 | .start = m_start, |
203 | .next = m_next, | |
204 | .stop = m_stop, | |
205 | .show = show_map | |
206 | }; | |
662795de EB |
207 | |
208 | static int maps_open(struct inode *inode, struct file *file) | |
209 | { | |
dbf8685c DH |
210 | struct proc_maps_private *priv; |
211 | int ret = -ENOMEM; | |
212 | ||
213 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
214 | if (priv) { | |
215 | priv->pid = proc_pid(inode); | |
216 | ret = seq_open(file, &proc_pid_maps_ops); | |
217 | if (!ret) { | |
218 | struct seq_file *m = file->private_data; | |
219 | m->private = priv; | |
220 | } else { | |
221 | kfree(priv); | |
222 | } | |
662795de EB |
223 | } |
224 | return ret; | |
225 | } | |
226 | ||
00977a59 | 227 | const struct file_operations proc_maps_operations = { |
662795de EB |
228 | .open = maps_open, |
229 | .read = seq_read, | |
230 | .llseek = seq_lseek, | |
dbf8685c | 231 | .release = seq_release_private, |
662795de EB |
232 | }; |
233 |