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Commit | Line | Data |
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ec26815a | 1 | /* /proc interface for AFS |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/slab.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/proc_fs.h> | |
15 | #include <linux/seq_file.h> | |
e8edc6e0 | 16 | #include <linux/sched.h> |
7c0f6ba6 | 17 | #include <linux/uaccess.h> |
1da177e4 LT |
18 | #include "internal.h" |
19 | ||
f044c884 DH |
20 | static inline struct afs_net *afs_proc2net(struct file *f) |
21 | { | |
22 | return &__afs_net; | |
23 | } | |
1da177e4 | 24 | |
f044c884 DH |
25 | static inline struct afs_net *afs_seq2net(struct seq_file *m) |
26 | { | |
27 | return &__afs_net; // TODO: use seq_file_net(m) | |
28 | } | |
1da177e4 LT |
29 | |
30 | static int afs_proc_cells_open(struct inode *inode, struct file *file); | |
31 | static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos); | |
32 | static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos); | |
33 | static void afs_proc_cells_stop(struct seq_file *p, void *v); | |
34 | static int afs_proc_cells_show(struct seq_file *m, void *v); | |
35 | static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf, | |
36 | size_t size, loff_t *_pos); | |
37 | ||
88e9d34c | 38 | static const struct seq_operations afs_proc_cells_ops = { |
1da177e4 LT |
39 | .start = afs_proc_cells_start, |
40 | .next = afs_proc_cells_next, | |
41 | .stop = afs_proc_cells_stop, | |
42 | .show = afs_proc_cells_show, | |
43 | }; | |
44 | ||
4b6f5d20 | 45 | static const struct file_operations afs_proc_cells_fops = { |
1da177e4 LT |
46 | .open = afs_proc_cells_open, |
47 | .read = seq_read, | |
48 | .write = afs_proc_cells_write, | |
49 | .llseek = seq_lseek, | |
50 | .release = seq_release, | |
51 | }; | |
52 | ||
1da177e4 LT |
53 | static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf, |
54 | size_t size, loff_t *_pos); | |
55 | static ssize_t afs_proc_rootcell_write(struct file *file, | |
56 | const char __user *buf, | |
57 | size_t size, loff_t *_pos); | |
58 | ||
4b6f5d20 | 59 | static const struct file_operations afs_proc_rootcell_fops = { |
1da177e4 LT |
60 | .read = afs_proc_rootcell_read, |
61 | .write = afs_proc_rootcell_write, | |
62 | .llseek = no_llseek, | |
1da177e4 LT |
63 | }; |
64 | ||
65 | static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file); | |
1da177e4 LT |
66 | static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos); |
67 | static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v, | |
68 | loff_t *pos); | |
69 | static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v); | |
70 | static int afs_proc_cell_volumes_show(struct seq_file *m, void *v); | |
71 | ||
88e9d34c | 72 | static const struct seq_operations afs_proc_cell_volumes_ops = { |
1da177e4 LT |
73 | .start = afs_proc_cell_volumes_start, |
74 | .next = afs_proc_cell_volumes_next, | |
75 | .stop = afs_proc_cell_volumes_stop, | |
76 | .show = afs_proc_cell_volumes_show, | |
77 | }; | |
78 | ||
4b6f5d20 | 79 | static const struct file_operations afs_proc_cell_volumes_fops = { |
1da177e4 LT |
80 | .open = afs_proc_cell_volumes_open, |
81 | .read = seq_read, | |
82 | .llseek = seq_lseek, | |
b42d570c | 83 | .release = seq_release, |
1da177e4 LT |
84 | }; |
85 | ||
86 | static int afs_proc_cell_vlservers_open(struct inode *inode, | |
87 | struct file *file); | |
1da177e4 LT |
88 | static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos); |
89 | static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v, | |
90 | loff_t *pos); | |
91 | static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v); | |
92 | static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v); | |
93 | ||
88e9d34c | 94 | static const struct seq_operations afs_proc_cell_vlservers_ops = { |
1da177e4 LT |
95 | .start = afs_proc_cell_vlservers_start, |
96 | .next = afs_proc_cell_vlservers_next, | |
97 | .stop = afs_proc_cell_vlservers_stop, | |
98 | .show = afs_proc_cell_vlservers_show, | |
99 | }; | |
100 | ||
4b6f5d20 | 101 | static const struct file_operations afs_proc_cell_vlservers_fops = { |
1da177e4 LT |
102 | .open = afs_proc_cell_vlservers_open, |
103 | .read = seq_read, | |
104 | .llseek = seq_lseek, | |
b42d570c | 105 | .release = seq_release, |
1da177e4 LT |
106 | }; |
107 | ||
d2ddc776 DH |
108 | static int afs_proc_servers_open(struct inode *inode, struct file *file); |
109 | static void *afs_proc_servers_start(struct seq_file *p, loff_t *pos); | |
110 | static void *afs_proc_servers_next(struct seq_file *p, void *v, | |
1da177e4 | 111 | loff_t *pos); |
d2ddc776 DH |
112 | static void afs_proc_servers_stop(struct seq_file *p, void *v); |
113 | static int afs_proc_servers_show(struct seq_file *m, void *v); | |
114 | ||
115 | static const struct seq_operations afs_proc_servers_ops = { | |
116 | .start = afs_proc_servers_start, | |
117 | .next = afs_proc_servers_next, | |
118 | .stop = afs_proc_servers_stop, | |
119 | .show = afs_proc_servers_show, | |
1da177e4 LT |
120 | }; |
121 | ||
d2ddc776 DH |
122 | static const struct file_operations afs_proc_servers_fops = { |
123 | .open = afs_proc_servers_open, | |
1da177e4 LT |
124 | .read = seq_read, |
125 | .llseek = seq_lseek, | |
b42d570c | 126 | .release = seq_release, |
1da177e4 LT |
127 | }; |
128 | ||
1da177e4 LT |
129 | /* |
130 | * initialise the /proc/fs/afs/ directory | |
131 | */ | |
f044c884 | 132 | int afs_proc_init(struct afs_net *net) |
1da177e4 | 133 | { |
1da177e4 LT |
134 | _enter(""); |
135 | ||
f044c884 DH |
136 | net->proc_afs = proc_mkdir("fs/afs", NULL); |
137 | if (!net->proc_afs) | |
ec26815a | 138 | goto error_dir; |
1da177e4 | 139 | |
f044c884 | 140 | if (!proc_create("cells", 0644, net->proc_afs, &afs_proc_cells_fops) || |
d2ddc776 DH |
141 | !proc_create("rootcell", 0644, net->proc_afs, &afs_proc_rootcell_fops) || |
142 | !proc_create("servers", 0644, net->proc_afs, &afs_proc_servers_fops)) | |
b42d570c | 143 | goto error_tree; |
1da177e4 LT |
144 | |
145 | _leave(" = 0"); | |
146 | return 0; | |
147 | ||
b42d570c | 148 | error_tree: |
f044c884 | 149 | proc_remove(net->proc_afs); |
ec26815a | 150 | error_dir: |
1da177e4 LT |
151 | _leave(" = -ENOMEM"); |
152 | return -ENOMEM; | |
ec26815a | 153 | } |
1da177e4 | 154 | |
1da177e4 LT |
155 | /* |
156 | * clean up the /proc/fs/afs/ directory | |
157 | */ | |
f044c884 | 158 | void afs_proc_cleanup(struct afs_net *net) |
1da177e4 | 159 | { |
f044c884 DH |
160 | proc_remove(net->proc_afs); |
161 | net->proc_afs = NULL; | |
ec26815a | 162 | } |
1da177e4 | 163 | |
1da177e4 LT |
164 | /* |
165 | * open "/proc/fs/afs/cells" which provides a summary of extant cells | |
166 | */ | |
167 | static int afs_proc_cells_open(struct inode *inode, struct file *file) | |
168 | { | |
169 | struct seq_file *m; | |
170 | int ret; | |
171 | ||
172 | ret = seq_open(file, &afs_proc_cells_ops); | |
173 | if (ret < 0) | |
174 | return ret; | |
175 | ||
176 | m = file->private_data; | |
d9dda78b | 177 | m->private = PDE_DATA(inode); |
1da177e4 | 178 | return 0; |
ec26815a | 179 | } |
1da177e4 | 180 | |
1da177e4 LT |
181 | /* |
182 | * set up the iterator to start reading from the cells list and return the | |
183 | * first item | |
184 | */ | |
185 | static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos) | |
186 | { | |
f044c884 DH |
187 | struct afs_net *net = afs_seq2net(m); |
188 | ||
989782dc | 189 | rcu_read_lock(); |
f044c884 | 190 | return seq_list_start_head(&net->proc_cells, *_pos); |
ec26815a | 191 | } |
1da177e4 | 192 | |
1da177e4 LT |
193 | /* |
194 | * move to next cell in cells list | |
195 | */ | |
f044c884 | 196 | static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos) |
1da177e4 | 197 | { |
f044c884 DH |
198 | struct afs_net *net = afs_seq2net(m); |
199 | ||
200 | return seq_list_next(v, &net->proc_cells, pos); | |
ec26815a | 201 | } |
1da177e4 | 202 | |
1da177e4 LT |
203 | /* |
204 | * clean up after reading from the cells list | |
205 | */ | |
f044c884 | 206 | static void afs_proc_cells_stop(struct seq_file *m, void *v) |
1da177e4 | 207 | { |
989782dc | 208 | rcu_read_unlock(); |
ec26815a | 209 | } |
1da177e4 | 210 | |
1da177e4 LT |
211 | /* |
212 | * display a header line followed by a load of cell lines | |
213 | */ | |
214 | static int afs_proc_cells_show(struct seq_file *m, void *v) | |
215 | { | |
216 | struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link); | |
f044c884 | 217 | struct afs_net *net = afs_seq2net(m); |
1da177e4 | 218 | |
f044c884 | 219 | if (v == &net->proc_cells) { |
ec26815a | 220 | /* display header on line 1 */ |
1da177e4 LT |
221 | seq_puts(m, "USE NAME\n"); |
222 | return 0; | |
223 | } | |
224 | ||
225 | /* display one cell per line on subsequent lines */ | |
989782dc | 226 | seq_printf(m, "%3u %s\n", atomic_read(&cell->usage), cell->name); |
1da177e4 | 227 | return 0; |
ec26815a | 228 | } |
1da177e4 | 229 | |
1da177e4 LT |
230 | /* |
231 | * handle writes to /proc/fs/afs/cells | |
232 | * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]" | |
233 | */ | |
234 | static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf, | |
235 | size_t size, loff_t *_pos) | |
236 | { | |
f044c884 | 237 | struct afs_net *net = afs_proc2net(file); |
1da177e4 LT |
238 | char *kbuf, *name, *args; |
239 | int ret; | |
240 | ||
241 | /* start by dragging the command into memory */ | |
242 | if (size <= 1 || size >= PAGE_SIZE) | |
243 | return -EINVAL; | |
244 | ||
16e5c1fc AV |
245 | kbuf = memdup_user_nul(buf, size); |
246 | if (IS_ERR(kbuf)) | |
247 | return PTR_ERR(kbuf); | |
1da177e4 LT |
248 | |
249 | /* trim to first NL */ | |
250 | name = memchr(kbuf, '\n', size); | |
251 | if (name) | |
252 | *name = 0; | |
253 | ||
254 | /* split into command, name and argslist */ | |
255 | name = strchr(kbuf, ' '); | |
256 | if (!name) | |
257 | goto inval; | |
258 | do { | |
259 | *name++ = 0; | |
260 | } while(*name == ' '); | |
261 | if (!*name) | |
262 | goto inval; | |
263 | ||
264 | args = strchr(name, ' '); | |
265 | if (!args) | |
266 | goto inval; | |
267 | do { | |
268 | *args++ = 0; | |
269 | } while(*args == ' '); | |
270 | if (!*args) | |
271 | goto inval; | |
272 | ||
273 | /* determine command to perform */ | |
274 | _debug("cmd=%s name=%s args=%s", kbuf, name, args); | |
275 | ||
276 | if (strcmp(kbuf, "add") == 0) { | |
277 | struct afs_cell *cell; | |
08e0e7c8 | 278 | |
989782dc | 279 | cell = afs_lookup_cell(net, name, strlen(name), args, true); |
08e0e7c8 DH |
280 | if (IS_ERR(cell)) { |
281 | ret = PTR_ERR(cell); | |
1da177e4 | 282 | goto done; |
08e0e7c8 | 283 | } |
1da177e4 | 284 | |
989782dc | 285 | set_bit(AFS_CELL_FL_NO_GC, &cell->flags); |
1da177e4 | 286 | printk("kAFS: Added new cell '%s'\n", name); |
ec26815a | 287 | } else { |
1da177e4 LT |
288 | goto inval; |
289 | } | |
290 | ||
291 | ret = size; | |
292 | ||
ec26815a | 293 | done: |
1da177e4 LT |
294 | kfree(kbuf); |
295 | _leave(" = %d", ret); | |
296 | return ret; | |
297 | ||
ec26815a | 298 | inval: |
1da177e4 LT |
299 | ret = -EINVAL; |
300 | printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n"); | |
301 | goto done; | |
ec26815a | 302 | } |
1da177e4 | 303 | |
1da177e4 LT |
304 | static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf, |
305 | size_t size, loff_t *_pos) | |
306 | { | |
307 | return 0; | |
308 | } | |
309 | ||
1da177e4 LT |
310 | /* |
311 | * handle writes to /proc/fs/afs/rootcell | |
312 | * - to initialize rootcell: echo "cell.name:192.168.231.14" | |
313 | */ | |
314 | static ssize_t afs_proc_rootcell_write(struct file *file, | |
315 | const char __user *buf, | |
316 | size_t size, loff_t *_pos) | |
317 | { | |
f044c884 | 318 | struct afs_net *net = afs_proc2net(file); |
1da177e4 LT |
319 | char *kbuf, *s; |
320 | int ret; | |
321 | ||
322 | /* start by dragging the command into memory */ | |
323 | if (size <= 1 || size >= PAGE_SIZE) | |
324 | return -EINVAL; | |
325 | ||
16e5c1fc AV |
326 | kbuf = memdup_user_nul(buf, size); |
327 | if (IS_ERR(kbuf)) | |
328 | return PTR_ERR(kbuf); | |
1da177e4 LT |
329 | |
330 | /* trim to first NL */ | |
331 | s = memchr(kbuf, '\n', size); | |
332 | if (s) | |
333 | *s = 0; | |
334 | ||
335 | /* determine command to perform */ | |
336 | _debug("rootcell=%s", kbuf); | |
337 | ||
f044c884 | 338 | ret = afs_cell_init(net, kbuf); |
1da177e4 LT |
339 | if (ret >= 0) |
340 | ret = size; /* consume everything, always */ | |
341 | ||
1da177e4 | 342 | kfree(kbuf); |
1da177e4 LT |
343 | _leave(" = %d", ret); |
344 | return ret; | |
ec26815a | 345 | } |
1da177e4 | 346 | |
1da177e4 LT |
347 | /* |
348 | * initialise /proc/fs/afs/<cell>/ | |
349 | */ | |
f044c884 | 350 | int afs_proc_cell_setup(struct afs_net *net, struct afs_cell *cell) |
1da177e4 | 351 | { |
b42d570c | 352 | struct proc_dir_entry *dir; |
1da177e4 | 353 | |
989782dc | 354 | _enter("%p{%s},%p", cell, cell->name, net->proc_afs); |
1da177e4 | 355 | |
f044c884 | 356 | dir = proc_mkdir(cell->name, net->proc_afs); |
b42d570c | 357 | if (!dir) |
ec26815a | 358 | goto error_dir; |
1da177e4 | 359 | |
d2ddc776 DH |
360 | if (!proc_create_data("vlservers", 0, dir, |
361 | &afs_proc_cell_vlservers_fops, cell) || | |
b42d570c | 362 | !proc_create_data("volumes", 0, dir, |
d2ddc776 | 363 | &afs_proc_cell_volumes_fops, cell)) |
b42d570c | 364 | goto error_tree; |
1da177e4 LT |
365 | |
366 | _leave(" = 0"); | |
367 | return 0; | |
368 | ||
b42d570c | 369 | error_tree: |
f044c884 | 370 | remove_proc_subtree(cell->name, net->proc_afs); |
ec26815a | 371 | error_dir: |
1da177e4 LT |
372 | _leave(" = -ENOMEM"); |
373 | return -ENOMEM; | |
ec26815a | 374 | } |
1da177e4 | 375 | |
1da177e4 LT |
376 | /* |
377 | * remove /proc/fs/afs/<cell>/ | |
378 | */ | |
f044c884 | 379 | void afs_proc_cell_remove(struct afs_net *net, struct afs_cell *cell) |
1da177e4 LT |
380 | { |
381 | _enter(""); | |
382 | ||
f044c884 | 383 | remove_proc_subtree(cell->name, net->proc_afs); |
1da177e4 LT |
384 | |
385 | _leave(""); | |
ec26815a | 386 | } |
1da177e4 | 387 | |
1da177e4 LT |
388 | /* |
389 | * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells | |
390 | */ | |
391 | static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file) | |
392 | { | |
393 | struct afs_cell *cell; | |
394 | struct seq_file *m; | |
395 | int ret; | |
396 | ||
d9dda78b | 397 | cell = PDE_DATA(inode); |
1da177e4 LT |
398 | if (!cell) |
399 | return -ENOENT; | |
400 | ||
401 | ret = seq_open(file, &afs_proc_cell_volumes_ops); | |
402 | if (ret < 0) | |
403 | return ret; | |
404 | ||
405 | m = file->private_data; | |
406 | m->private = cell; | |
407 | ||
408 | return 0; | |
ec26815a | 409 | } |
1da177e4 | 410 | |
1da177e4 LT |
411 | /* |
412 | * set up the iterator to start reading from the cells list and return the | |
413 | * first item | |
414 | */ | |
415 | static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos) | |
416 | { | |
1da177e4 | 417 | struct afs_cell *cell = m->private; |
1da177e4 LT |
418 | |
419 | _enter("cell=%p pos=%Ld", cell, *_pos); | |
420 | ||
d2ddc776 DH |
421 | read_lock(&cell->proc_lock); |
422 | return seq_list_start_head(&cell->proc_volumes, *_pos); | |
ec26815a | 423 | } |
1da177e4 | 424 | |
1da177e4 LT |
425 | /* |
426 | * move to next cell in cells list | |
427 | */ | |
428 | static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v, | |
429 | loff_t *_pos) | |
430 | { | |
1da177e4 LT |
431 | struct afs_cell *cell = p->private; |
432 | ||
433 | _enter("cell=%p pos=%Ld", cell, *_pos); | |
d2ddc776 | 434 | return seq_list_next(v, &cell->proc_volumes, _pos); |
ec26815a | 435 | } |
1da177e4 | 436 | |
1da177e4 LT |
437 | /* |
438 | * clean up after reading from the cells list | |
439 | */ | |
440 | static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v) | |
441 | { | |
442 | struct afs_cell *cell = p->private; | |
443 | ||
d2ddc776 | 444 | read_unlock(&cell->proc_lock); |
ec26815a | 445 | } |
1da177e4 | 446 | |
d2ddc776 DH |
447 | static const char afs_vol_types[3][3] = { |
448 | [AFSVL_RWVOL] = "RW", | |
449 | [AFSVL_ROVOL] = "RO", | |
450 | [AFSVL_BACKVOL] = "BK", | |
08e0e7c8 DH |
451 | }; |
452 | ||
1da177e4 LT |
453 | /* |
454 | * display a header line followed by a load of volume lines | |
455 | */ | |
456 | static int afs_proc_cell_volumes_show(struct seq_file *m, void *v) | |
457 | { | |
a6a8bd6d | 458 | struct afs_cell *cell = m->private; |
d2ddc776 | 459 | struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link); |
1da177e4 | 460 | |
d2ddc776 DH |
461 | /* Display header on line 1 */ |
462 | if (v == &cell->proc_volumes) { | |
463 | seq_puts(m, "USE VID TY\n"); | |
1da177e4 LT |
464 | return 0; |
465 | } | |
466 | ||
d2ddc776 DH |
467 | seq_printf(m, "%3d %08x %s\n", |
468 | atomic_read(&vol->usage), vol->vid, | |
469 | afs_vol_types[vol->type]); | |
1da177e4 LT |
470 | |
471 | return 0; | |
ec26815a | 472 | } |
1da177e4 | 473 | |
1da177e4 LT |
474 | /* |
475 | * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume | |
476 | * location server | |
477 | */ | |
478 | static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file) | |
479 | { | |
480 | struct afs_cell *cell; | |
481 | struct seq_file *m; | |
482 | int ret; | |
483 | ||
d9dda78b | 484 | cell = PDE_DATA(inode); |
1da177e4 LT |
485 | if (!cell) |
486 | return -ENOENT; | |
487 | ||
08e0e7c8 | 488 | ret = seq_open(file, &afs_proc_cell_vlservers_ops); |
1da177e4 LT |
489 | if (ret<0) |
490 | return ret; | |
491 | ||
492 | m = file->private_data; | |
493 | m->private = cell; | |
494 | ||
495 | return 0; | |
ec26815a | 496 | } |
1da177e4 | 497 | |
1da177e4 LT |
498 | /* |
499 | * set up the iterator to start reading from the cells list and return the | |
500 | * first item | |
501 | */ | |
502 | static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos) | |
503 | { | |
8b2a464c | 504 | struct afs_addr_list *alist; |
1da177e4 LT |
505 | struct afs_cell *cell = m->private; |
506 | loff_t pos = *_pos; | |
507 | ||
8b2a464c | 508 | rcu_read_lock(); |
1da177e4 | 509 | |
8b2a464c | 510 | alist = rcu_dereference(cell->vl_addrs); |
1da177e4 LT |
511 | |
512 | /* allow for the header line */ | |
513 | if (!pos) | |
514 | return (void *) 1; | |
515 | pos--; | |
516 | ||
8b2a464c | 517 | if (!alist || pos >= alist->nr_addrs) |
1da177e4 LT |
518 | return NULL; |
519 | ||
8b2a464c | 520 | return alist->addrs + pos; |
ec26815a | 521 | } |
1da177e4 | 522 | |
1da177e4 LT |
523 | /* |
524 | * move to next cell in cells list | |
525 | */ | |
526 | static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v, | |
527 | loff_t *_pos) | |
528 | { | |
8b2a464c | 529 | struct afs_addr_list *alist; |
1da177e4 LT |
530 | struct afs_cell *cell = p->private; |
531 | loff_t pos; | |
532 | ||
8b2a464c | 533 | alist = rcu_dereference(cell->vl_addrs); |
1da177e4 LT |
534 | |
535 | pos = *_pos; | |
536 | (*_pos)++; | |
8b2a464c | 537 | if (!alist || pos >= alist->nr_addrs) |
1da177e4 LT |
538 | return NULL; |
539 | ||
8b2a464c | 540 | return alist->addrs + pos; |
ec26815a | 541 | } |
1da177e4 | 542 | |
1da177e4 LT |
543 | /* |
544 | * clean up after reading from the cells list | |
545 | */ | |
546 | static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v) | |
547 | { | |
8b2a464c | 548 | rcu_read_unlock(); |
ec26815a | 549 | } |
1da177e4 | 550 | |
1da177e4 LT |
551 | /* |
552 | * display a header line followed by a load of volume lines | |
553 | */ | |
554 | static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v) | |
555 | { | |
4d9df986 | 556 | struct sockaddr_rxrpc *addr = v; |
1da177e4 LT |
557 | |
558 | /* display header on line 1 */ | |
4d9df986 | 559 | if (v == (void *)1) { |
1da177e4 LT |
560 | seq_puts(m, "ADDRESS\n"); |
561 | return 0; | |
562 | } | |
563 | ||
564 | /* display one cell per line on subsequent lines */ | |
4d9df986 | 565 | seq_printf(m, "%pISp\n", &addr->transport); |
1da177e4 | 566 | return 0; |
ec26815a | 567 | } |
1da177e4 | 568 | |
1da177e4 | 569 | /* |
d2ddc776 | 570 | * open "/proc/fs/afs/servers" which provides a summary of active |
1da177e4 LT |
571 | * servers |
572 | */ | |
d2ddc776 | 573 | static int afs_proc_servers_open(struct inode *inode, struct file *file) |
1da177e4 | 574 | { |
d2ddc776 | 575 | return seq_open(file, &afs_proc_servers_ops); |
ec26815a | 576 | } |
1da177e4 | 577 | |
1da177e4 | 578 | /* |
d2ddc776 DH |
579 | * Set up the iterator to start reading from the server list and return the |
580 | * first item. | |
1da177e4 | 581 | */ |
d2ddc776 | 582 | static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos) |
1da177e4 | 583 | { |
d2ddc776 | 584 | struct afs_net *net = afs_seq2net(m); |
1da177e4 | 585 | |
d2ddc776 DH |
586 | rcu_read_lock(); |
587 | return seq_hlist_start_head_rcu(&net->fs_proc, *_pos); | |
ec26815a | 588 | } |
1da177e4 | 589 | |
1da177e4 LT |
590 | /* |
591 | * move to next cell in cells list | |
592 | */ | |
d2ddc776 | 593 | static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos) |
1da177e4 | 594 | { |
d2ddc776 | 595 | struct afs_net *net = afs_seq2net(m); |
1da177e4 | 596 | |
d2ddc776 | 597 | return seq_hlist_next_rcu(v, &net->fs_proc, _pos); |
ec26815a | 598 | } |
1da177e4 | 599 | |
1da177e4 LT |
600 | /* |
601 | * clean up after reading from the cells list | |
602 | */ | |
d2ddc776 | 603 | static void afs_proc_servers_stop(struct seq_file *p, void *v) |
1da177e4 | 604 | { |
d2ddc776 | 605 | rcu_read_unlock(); |
ec26815a | 606 | } |
1da177e4 | 607 | |
1da177e4 LT |
608 | /* |
609 | * display a header line followed by a load of volume lines | |
610 | */ | |
d2ddc776 | 611 | static int afs_proc_servers_show(struct seq_file *m, void *v) |
1da177e4 | 612 | { |
d2ddc776 DH |
613 | struct afs_server *server; |
614 | struct afs_addr_list *alist; | |
1da177e4 | 615 | |
d2ddc776 DH |
616 | if (v == SEQ_START_TOKEN) { |
617 | seq_puts(m, "UUID USE ADDR\n"); | |
1da177e4 LT |
618 | return 0; |
619 | } | |
620 | ||
d2ddc776 DH |
621 | server = list_entry(v, struct afs_server, proc_link); |
622 | alist = rcu_dereference(server->addresses); | |
623 | seq_printf(m, "%pU %3d %pISp\n", | |
624 | &server->uuid, | |
625 | atomic_read(&server->usage), | |
626 | &alist->addrs[alist->index].transport); | |
1da177e4 | 627 | return 0; |
ec26815a | 628 | } |