diff options
author | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-17 16:15:55 -0500 |
---|---|---|
committer | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-17 16:15:55 -0500 |
commit | 8dea78da5cee153b8af9c07a2745f6c55057fe12 (patch) | |
tree | a8f4d49d63b1ecc92f2fddceba0655b2472c5bd9 /fs/proc_namespace.c | |
parent | 406089d01562f1e2bf9f089fd7637009ebaad589 (diff) |
Patched in Tegra support.
Diffstat (limited to 'fs/proc_namespace.c')
-rw-r--r-- | fs/proc_namespace.c | 332 |
1 files changed, 0 insertions, 332 deletions
diff --git a/fs/proc_namespace.c b/fs/proc_namespace.c deleted file mode 100644 index 5fe34c355e8..00000000000 --- a/fs/proc_namespace.c +++ /dev/null | |||
@@ -1,332 +0,0 @@ | |||
1 | /* | ||
2 | * fs/proc_namespace.c - handling of /proc/<pid>/{mounts,mountinfo,mountstats} | ||
3 | * | ||
4 | * In fact, that's a piece of procfs; it's *almost* isolated from | ||
5 | * the rest of fs/proc, but has rather close relationships with | ||
6 | * fs/namespace.c, thus here instead of fs/proc | ||
7 | * | ||
8 | */ | ||
9 | #include <linux/mnt_namespace.h> | ||
10 | #include <linux/nsproxy.h> | ||
11 | #include <linux/security.h> | ||
12 | #include <linux/fs_struct.h> | ||
13 | #include "proc/internal.h" /* only for get_proc_task() in ->open() */ | ||
14 | |||
15 | #include "pnode.h" | ||
16 | #include "internal.h" | ||
17 | |||
18 | static unsigned mounts_poll(struct file *file, poll_table *wait) | ||
19 | { | ||
20 | struct proc_mounts *p = proc_mounts(file->private_data); | ||
21 | struct mnt_namespace *ns = p->ns; | ||
22 | unsigned res = POLLIN | POLLRDNORM; | ||
23 | |||
24 | poll_wait(file, &p->ns->poll, wait); | ||
25 | |||
26 | br_read_lock(&vfsmount_lock); | ||
27 | if (p->m.poll_event != ns->event) { | ||
28 | p->m.poll_event = ns->event; | ||
29 | res |= POLLERR | POLLPRI; | ||
30 | } | ||
31 | br_read_unlock(&vfsmount_lock); | ||
32 | |||
33 | return res; | ||
34 | } | ||
35 | |||
36 | struct proc_fs_info { | ||
37 | int flag; | ||
38 | const char *str; | ||
39 | }; | ||
40 | |||
41 | static int show_sb_opts(struct seq_file *m, struct super_block *sb) | ||
42 | { | ||
43 | static const struct proc_fs_info fs_info[] = { | ||
44 | { MS_SYNCHRONOUS, ",sync" }, | ||
45 | { MS_DIRSYNC, ",dirsync" }, | ||
46 | { MS_MANDLOCK, ",mand" }, | ||
47 | { 0, NULL } | ||
48 | }; | ||
49 | const struct proc_fs_info *fs_infop; | ||
50 | |||
51 | for (fs_infop = fs_info; fs_infop->flag; fs_infop++) { | ||
52 | if (sb->s_flags & fs_infop->flag) | ||
53 | seq_puts(m, fs_infop->str); | ||
54 | } | ||
55 | |||
56 | return security_sb_show_options(m, sb); | ||
57 | } | ||
58 | |||
59 | static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt) | ||
60 | { | ||
61 | static const struct proc_fs_info mnt_info[] = { | ||
62 | { MNT_NOSUID, ",nosuid" }, | ||
63 | { MNT_NODEV, ",nodev" }, | ||
64 | { MNT_NOEXEC, ",noexec" }, | ||
65 | { MNT_NOATIME, ",noatime" }, | ||
66 | { MNT_NODIRATIME, ",nodiratime" }, | ||
67 | { MNT_RELATIME, ",relatime" }, | ||
68 | { 0, NULL } | ||
69 | }; | ||
70 | const struct proc_fs_info *fs_infop; | ||
71 | |||
72 | for (fs_infop = mnt_info; fs_infop->flag; fs_infop++) { | ||
73 | if (mnt->mnt_flags & fs_infop->flag) | ||
74 | seq_puts(m, fs_infop->str); | ||
75 | } | ||
76 | } | ||
77 | |||
78 | static inline void mangle(struct seq_file *m, const char *s) | ||
79 | { | ||
80 | seq_escape(m, s, " \t\n\\"); | ||
81 | } | ||
82 | |||
83 | static void show_type(struct seq_file *m, struct super_block *sb) | ||
84 | { | ||
85 | mangle(m, sb->s_type->name); | ||
86 | if (sb->s_subtype && sb->s_subtype[0]) { | ||
87 | seq_putc(m, '.'); | ||
88 | mangle(m, sb->s_subtype); | ||
89 | } | ||
90 | } | ||
91 | |||
92 | static int show_vfsmnt(struct seq_file *m, struct vfsmount *mnt) | ||
93 | { | ||
94 | struct mount *r = real_mount(mnt); | ||
95 | int err = 0; | ||
96 | struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt }; | ||
97 | struct super_block *sb = mnt_path.dentry->d_sb; | ||
98 | |||
99 | if (sb->s_op->show_devname) { | ||
100 | err = sb->s_op->show_devname(m, mnt_path.dentry); | ||
101 | if (err) | ||
102 | goto out; | ||
103 | } else { | ||
104 | mangle(m, r->mnt_devname ? r->mnt_devname : "none"); | ||
105 | } | ||
106 | seq_putc(m, ' '); | ||
107 | seq_path(m, &mnt_path, " \t\n\\"); | ||
108 | seq_putc(m, ' '); | ||
109 | show_type(m, sb); | ||
110 | seq_puts(m, __mnt_is_readonly(mnt) ? " ro" : " rw"); | ||
111 | err = show_sb_opts(m, sb); | ||
112 | if (err) | ||
113 | goto out; | ||
114 | show_mnt_opts(m, mnt); | ||
115 | if (sb->s_op->show_options) | ||
116 | err = sb->s_op->show_options(m, mnt_path.dentry); | ||
117 | seq_puts(m, " 0 0\n"); | ||
118 | out: | ||
119 | return err; | ||
120 | } | ||
121 | |||
122 | static int show_mountinfo(struct seq_file *m, struct vfsmount *mnt) | ||
123 | { | ||
124 | struct proc_mounts *p = proc_mounts(m); | ||
125 | struct mount *r = real_mount(mnt); | ||
126 | struct super_block *sb = mnt->mnt_sb; | ||
127 | struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt }; | ||
128 | struct path root = p->root; | ||
129 | int err = 0; | ||
130 | |||
131 | seq_printf(m, "%i %i %u:%u ", r->mnt_id, r->mnt_parent->mnt_id, | ||
132 | MAJOR(sb->s_dev), MINOR(sb->s_dev)); | ||
133 | if (sb->s_op->show_path) | ||
134 | err = sb->s_op->show_path(m, mnt->mnt_root); | ||
135 | else | ||
136 | seq_dentry(m, mnt->mnt_root, " \t\n\\"); | ||
137 | if (err) | ||
138 | goto out; | ||
139 | seq_putc(m, ' '); | ||
140 | |||
141 | /* mountpoints outside of chroot jail will give SEQ_SKIP on this */ | ||
142 | err = seq_path_root(m, &mnt_path, &root, " \t\n\\"); | ||
143 | if (err) | ||
144 | goto out; | ||
145 | |||
146 | seq_puts(m, mnt->mnt_flags & MNT_READONLY ? " ro" : " rw"); | ||
147 | show_mnt_opts(m, mnt); | ||
148 | |||
149 | /* Tagged fields ("foo:X" or "bar") */ | ||
150 | if (IS_MNT_SHARED(r)) | ||
151 | seq_printf(m, " shared:%i", r->mnt_group_id); | ||
152 | if (IS_MNT_SLAVE(r)) { | ||
153 | int master = r->mnt_master->mnt_group_id; | ||
154 | int dom = get_dominating_id(r, &p->root); | ||
155 | seq_printf(m, " master:%i", master); | ||
156 | if (dom && dom != master) | ||
157 | seq_printf(m, " propagate_from:%i", dom); | ||
158 | } | ||
159 | if (IS_MNT_UNBINDABLE(r)) | ||
160 | seq_puts(m, " unbindable"); | ||
161 | |||
162 | /* Filesystem specific data */ | ||
163 | seq_puts(m, " - "); | ||
164 | show_type(m, sb); | ||
165 | seq_putc(m, ' '); | ||
166 | if (sb->s_op->show_devname) | ||
167 | err = sb->s_op->show_devname(m, mnt->mnt_root); | ||
168 | else | ||
169 | mangle(m, r->mnt_devname ? r->mnt_devname : "none"); | ||
170 | if (err) | ||
171 | goto out; | ||
172 | seq_puts(m, sb->s_flags & MS_RDONLY ? " ro" : " rw"); | ||
173 | err = show_sb_opts(m, sb); | ||
174 | if (err) | ||
175 | goto out; | ||
176 | if (sb->s_op->show_options) | ||
177 | err = sb->s_op->show_options(m, mnt->mnt_root); | ||
178 | seq_putc(m, '\n'); | ||
179 | out: | ||
180 | return err; | ||
181 | } | ||
182 | |||
183 | static int show_vfsstat(struct seq_file *m, struct vfsmount *mnt) | ||
184 | { | ||
185 | struct mount *r = real_mount(mnt); | ||
186 | struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt }; | ||
187 | struct super_block *sb = mnt_path.dentry->d_sb; | ||
188 | int err = 0; | ||
189 | |||
190 | /* device */ | ||
191 | if (sb->s_op->show_devname) { | ||
192 | seq_puts(m, "device "); | ||
193 | err = sb->s_op->show_devname(m, mnt_path.dentry); | ||
194 | } else { | ||
195 | if (r->mnt_devname) { | ||
196 | seq_puts(m, "device "); | ||
197 | mangle(m, r->mnt_devname); | ||
198 | } else | ||
199 | seq_puts(m, "no device"); | ||
200 | } | ||
201 | |||
202 | /* mount point */ | ||
203 | seq_puts(m, " mounted on "); | ||
204 | seq_path(m, &mnt_path, " \t\n\\"); | ||
205 | seq_putc(m, ' '); | ||
206 | |||
207 | /* file system type */ | ||
208 | seq_puts(m, "with fstype "); | ||
209 | show_type(m, sb); | ||
210 | |||
211 | /* optional statistics */ | ||
212 | if (sb->s_op->show_stats) { | ||
213 | seq_putc(m, ' '); | ||
214 | if (!err) | ||
215 | err = sb->s_op->show_stats(m, mnt_path.dentry); | ||
216 | } | ||
217 | |||
218 | seq_putc(m, '\n'); | ||
219 | return err; | ||
220 | } | ||
221 | |||
222 | static int mounts_open_common(struct inode *inode, struct file *file, | ||
223 | int (*show)(struct seq_file *, struct vfsmount *)) | ||
224 | { | ||
225 | struct task_struct *task = get_proc_task(inode); | ||
226 | struct nsproxy *nsp; | ||
227 | struct mnt_namespace *ns = NULL; | ||
228 | struct path root; | ||
229 | struct proc_mounts *p; | ||
230 | int ret = -EINVAL; | ||
231 | |||
232 | if (!task) | ||
233 | goto err; | ||
234 | |||
235 | rcu_read_lock(); | ||
236 | nsp = task_nsproxy(task); | ||
237 | if (!nsp) { | ||
238 | rcu_read_unlock(); | ||
239 | put_task_struct(task); | ||
240 | goto err; | ||
241 | } | ||
242 | ns = nsp->mnt_ns; | ||
243 | if (!ns) { | ||
244 | rcu_read_unlock(); | ||
245 | put_task_struct(task); | ||
246 | goto err; | ||
247 | } | ||
248 | get_mnt_ns(ns); | ||
249 | rcu_read_unlock(); | ||
250 | task_lock(task); | ||
251 | if (!task->fs) { | ||
252 | task_unlock(task); | ||
253 | put_task_struct(task); | ||
254 | ret = -ENOENT; | ||
255 | goto err_put_ns; | ||
256 | } | ||
257 | get_fs_root(task->fs, &root); | ||
258 | task_unlock(task); | ||
259 | put_task_struct(task); | ||
260 | |||
261 | ret = -ENOMEM; | ||
262 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | ||
263 | if (!p) | ||
264 | goto err_put_path; | ||
265 | |||
266 | file->private_data = &p->m; | ||
267 | ret = seq_open(file, &mounts_op); | ||
268 | if (ret) | ||
269 | goto err_free; | ||
270 | |||
271 | p->ns = ns; | ||
272 | p->root = root; | ||
273 | p->m.poll_event = ns->event; | ||
274 | p->show = show; | ||
275 | |||
276 | return 0; | ||
277 | |||
278 | err_free: | ||
279 | kfree(p); | ||
280 | err_put_path: | ||
281 | path_put(&root); | ||
282 | err_put_ns: | ||
283 | put_mnt_ns(ns); | ||
284 | err: | ||
285 | return ret; | ||
286 | } | ||
287 | |||
288 | static int mounts_release(struct inode *inode, struct file *file) | ||
289 | { | ||
290 | struct proc_mounts *p = proc_mounts(file->private_data); | ||
291 | path_put(&p->root); | ||
292 | put_mnt_ns(p->ns); | ||
293 | return seq_release(inode, file); | ||
294 | } | ||
295 | |||
296 | static int mounts_open(struct inode *inode, struct file *file) | ||
297 | { | ||
298 | return mounts_open_common(inode, file, show_vfsmnt); | ||
299 | } | ||
300 | |||
301 | static int mountinfo_open(struct inode *inode, struct file *file) | ||
302 | { | ||
303 | return mounts_open_common(inode, file, show_mountinfo); | ||
304 | } | ||
305 | |||
306 | static int mountstats_open(struct inode *inode, struct file *file) | ||
307 | { | ||
308 | return mounts_open_common(inode, file, show_vfsstat); | ||
309 | } | ||
310 | |||
311 | const struct file_operations proc_mounts_operations = { | ||
312 | .open = mounts_open, | ||
313 | .read = seq_read, | ||
314 | .llseek = seq_lseek, | ||
315 | .release = mounts_release, | ||
316 | .poll = mounts_poll, | ||
317 | }; | ||
318 | |||
319 | const struct file_operations proc_mountinfo_operations = { | ||
320 | .open = mountinfo_open, | ||
321 | .read = seq_read, | ||
322 | .llseek = seq_lseek, | ||
323 | .release = mounts_release, | ||
324 | .poll = mounts_poll, | ||
325 | }; | ||
326 | |||
327 | const struct file_operations proc_mountstats_operations = { | ||
328 | .open = mountstats_open, | ||
329 | .read = seq_read, | ||
330 | .llseek = seq_lseek, | ||
331 | .release = mounts_release, | ||
332 | }; | ||