x86/mm/pat: Don't report PAT on CPUs that don't support it
[linux/fpc-iii.git] / fs / afs / proc.c
blob35efb9a31dd7b1033a93b44162276f7cac36f921
1 /* /proc interface for AFS
3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
12 #include <linux/slab.h>
13 #include <linux/module.h>
14 #include <linux/proc_fs.h>
15 #include <linux/seq_file.h>
16 #include <linux/sched.h>
17 #include <linux/uaccess.h>
18 #include "internal.h"
20 static struct proc_dir_entry *proc_afs;
23 static int afs_proc_cells_open(struct inode *inode, struct file *file);
24 static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos);
25 static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos);
26 static void afs_proc_cells_stop(struct seq_file *p, void *v);
27 static int afs_proc_cells_show(struct seq_file *m, void *v);
28 static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
29 size_t size, loff_t *_pos);
31 static const struct seq_operations afs_proc_cells_ops = {
32 .start = afs_proc_cells_start,
33 .next = afs_proc_cells_next,
34 .stop = afs_proc_cells_stop,
35 .show = afs_proc_cells_show,
38 static const struct file_operations afs_proc_cells_fops = {
39 .open = afs_proc_cells_open,
40 .read = seq_read,
41 .write = afs_proc_cells_write,
42 .llseek = seq_lseek,
43 .release = seq_release,
46 static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
47 size_t size, loff_t *_pos);
48 static ssize_t afs_proc_rootcell_write(struct file *file,
49 const char __user *buf,
50 size_t size, loff_t *_pos);
52 static const struct file_operations afs_proc_rootcell_fops = {
53 .read = afs_proc_rootcell_read,
54 .write = afs_proc_rootcell_write,
55 .llseek = no_llseek,
58 static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file);
59 static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos);
60 static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
61 loff_t *pos);
62 static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
63 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);
65 static const struct seq_operations afs_proc_cell_volumes_ops = {
66 .start = afs_proc_cell_volumes_start,
67 .next = afs_proc_cell_volumes_next,
68 .stop = afs_proc_cell_volumes_stop,
69 .show = afs_proc_cell_volumes_show,
72 static const struct file_operations afs_proc_cell_volumes_fops = {
73 .open = afs_proc_cell_volumes_open,
74 .read = seq_read,
75 .llseek = seq_lseek,
76 .release = seq_release,
79 static int afs_proc_cell_vlservers_open(struct inode *inode,
80 struct file *file);
81 static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos);
82 static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
83 loff_t *pos);
84 static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
85 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);
87 static const struct seq_operations afs_proc_cell_vlservers_ops = {
88 .start = afs_proc_cell_vlservers_start,
89 .next = afs_proc_cell_vlservers_next,
90 .stop = afs_proc_cell_vlservers_stop,
91 .show = afs_proc_cell_vlservers_show,
94 static const struct file_operations afs_proc_cell_vlservers_fops = {
95 .open = afs_proc_cell_vlservers_open,
96 .read = seq_read,
97 .llseek = seq_lseek,
98 .release = seq_release,
101 static int afs_proc_cell_servers_open(struct inode *inode, struct file *file);
102 static void *afs_proc_cell_servers_start(struct seq_file *p, loff_t *pos);
103 static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
104 loff_t *pos);
105 static void afs_proc_cell_servers_stop(struct seq_file *p, void *v);
106 static int afs_proc_cell_servers_show(struct seq_file *m, void *v);
108 static const struct seq_operations afs_proc_cell_servers_ops = {
109 .start = afs_proc_cell_servers_start,
110 .next = afs_proc_cell_servers_next,
111 .stop = afs_proc_cell_servers_stop,
112 .show = afs_proc_cell_servers_show,
115 static const struct file_operations afs_proc_cell_servers_fops = {
116 .open = afs_proc_cell_servers_open,
117 .read = seq_read,
118 .llseek = seq_lseek,
119 .release = seq_release,
123 * initialise the /proc/fs/afs/ directory
125 int afs_proc_init(void)
127 _enter("");
129 proc_afs = proc_mkdir("fs/afs", NULL);
130 if (!proc_afs)
131 goto error_dir;
133 if (!proc_create("cells", 0644, proc_afs, &afs_proc_cells_fops) ||
134 !proc_create("rootcell", 0644, proc_afs, &afs_proc_rootcell_fops))
135 goto error_tree;
137 _leave(" = 0");
138 return 0;
140 error_tree:
141 remove_proc_subtree("fs/afs", NULL);
142 error_dir:
143 _leave(" = -ENOMEM");
144 return -ENOMEM;
148 * clean up the /proc/fs/afs/ directory
150 void afs_proc_cleanup(void)
152 remove_proc_subtree("fs/afs", NULL);
156 * open "/proc/fs/afs/cells" which provides a summary of extant cells
158 static int afs_proc_cells_open(struct inode *inode, struct file *file)
160 struct seq_file *m;
161 int ret;
163 ret = seq_open(file, &afs_proc_cells_ops);
164 if (ret < 0)
165 return ret;
167 m = file->private_data;
168 m->private = PDE_DATA(inode);
170 return 0;
174 * set up the iterator to start reading from the cells list and return the
175 * first item
177 static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
179 /* lock the list against modification */
180 down_read(&afs_proc_cells_sem);
181 return seq_list_start_head(&afs_proc_cells, *_pos);
185 * move to next cell in cells list
187 static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos)
189 return seq_list_next(v, &afs_proc_cells, pos);
193 * clean up after reading from the cells list
195 static void afs_proc_cells_stop(struct seq_file *p, void *v)
197 up_read(&afs_proc_cells_sem);
201 * display a header line followed by a load of cell lines
203 static int afs_proc_cells_show(struct seq_file *m, void *v)
205 struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
207 if (v == &afs_proc_cells) {
208 /* display header on line 1 */
209 seq_puts(m, "USE NAME\n");
210 return 0;
213 /* display one cell per line on subsequent lines */
214 seq_printf(m, "%3d %s\n",
215 atomic_read(&cell->usage), cell->name);
216 return 0;
220 * handle writes to /proc/fs/afs/cells
221 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
223 static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
224 size_t size, loff_t *_pos)
226 char *kbuf, *name, *args;
227 int ret;
229 /* start by dragging the command into memory */
230 if (size <= 1 || size >= PAGE_SIZE)
231 return -EINVAL;
233 kbuf = memdup_user_nul(buf, size);
234 if (IS_ERR(kbuf))
235 return PTR_ERR(kbuf);
237 /* trim to first NL */
238 name = memchr(kbuf, '\n', size);
239 if (name)
240 *name = 0;
242 /* split into command, name and argslist */
243 name = strchr(kbuf, ' ');
244 if (!name)
245 goto inval;
246 do {
247 *name++ = 0;
248 } while(*name == ' ');
249 if (!*name)
250 goto inval;
252 args = strchr(name, ' ');
253 if (!args)
254 goto inval;
255 do {
256 *args++ = 0;
257 } while(*args == ' ');
258 if (!*args)
259 goto inval;
261 /* determine command to perform */
262 _debug("cmd=%s name=%s args=%s", kbuf, name, args);
264 if (strcmp(kbuf, "add") == 0) {
265 struct afs_cell *cell;
267 cell = afs_cell_create(name, strlen(name), args, false);
268 if (IS_ERR(cell)) {
269 ret = PTR_ERR(cell);
270 goto done;
273 afs_put_cell(cell);
274 printk("kAFS: Added new cell '%s'\n", name);
275 } else {
276 goto inval;
279 ret = size;
281 done:
282 kfree(kbuf);
283 _leave(" = %d", ret);
284 return ret;
286 inval:
287 ret = -EINVAL;
288 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
289 goto done;
292 static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
293 size_t size, loff_t *_pos)
295 return 0;
299 * handle writes to /proc/fs/afs/rootcell
300 * - to initialize rootcell: echo "cell.name:192.168.231.14"
302 static ssize_t afs_proc_rootcell_write(struct file *file,
303 const char __user *buf,
304 size_t size, loff_t *_pos)
306 char *kbuf, *s;
307 int ret;
309 /* start by dragging the command into memory */
310 if (size <= 1 || size >= PAGE_SIZE)
311 return -EINVAL;
313 kbuf = memdup_user_nul(buf, size);
314 if (IS_ERR(kbuf))
315 return PTR_ERR(kbuf);
317 /* trim to first NL */
318 s = memchr(kbuf, '\n', size);
319 if (s)
320 *s = 0;
322 /* determine command to perform */
323 _debug("rootcell=%s", kbuf);
325 ret = afs_cell_init(kbuf);
326 if (ret >= 0)
327 ret = size; /* consume everything, always */
329 kfree(kbuf);
330 _leave(" = %d", ret);
331 return ret;
335 * initialise /proc/fs/afs/<cell>/
337 int afs_proc_cell_setup(struct afs_cell *cell)
339 struct proc_dir_entry *dir;
341 _enter("%p{%s}", cell, cell->name);
343 dir = proc_mkdir(cell->name, proc_afs);
344 if (!dir)
345 goto error_dir;
347 if (!proc_create_data("servers", 0, dir,
348 &afs_proc_cell_servers_fops, cell) ||
349 !proc_create_data("vlservers", 0, dir,
350 &afs_proc_cell_vlservers_fops, cell) ||
351 !proc_create_data("volumes", 0, dir,
352 &afs_proc_cell_volumes_fops, cell))
353 goto error_tree;
355 _leave(" = 0");
356 return 0;
358 error_tree:
359 remove_proc_subtree(cell->name, proc_afs);
360 error_dir:
361 _leave(" = -ENOMEM");
362 return -ENOMEM;
366 * remove /proc/fs/afs/<cell>/
368 void afs_proc_cell_remove(struct afs_cell *cell)
370 _enter("");
372 remove_proc_subtree(cell->name, proc_afs);
374 _leave("");
378 * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
380 static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
382 struct afs_cell *cell;
383 struct seq_file *m;
384 int ret;
386 cell = PDE_DATA(inode);
387 if (!cell)
388 return -ENOENT;
390 ret = seq_open(file, &afs_proc_cell_volumes_ops);
391 if (ret < 0)
392 return ret;
394 m = file->private_data;
395 m->private = cell;
397 return 0;
401 * set up the iterator to start reading from the cells list and return the
402 * first item
404 static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
406 struct afs_cell *cell = m->private;
408 _enter("cell=%p pos=%Ld", cell, *_pos);
410 /* lock the list against modification */
411 down_read(&cell->vl_sem);
412 return seq_list_start_head(&cell->vl_list, *_pos);
416 * move to next cell in cells list
418 static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
419 loff_t *_pos)
421 struct afs_cell *cell = p->private;
423 _enter("cell=%p pos=%Ld", cell, *_pos);
424 return seq_list_next(v, &cell->vl_list, _pos);
428 * clean up after reading from the cells list
430 static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
432 struct afs_cell *cell = p->private;
434 up_read(&cell->vl_sem);
437 static const char afs_vlocation_states[][4] = {
438 [AFS_VL_NEW] = "New",
439 [AFS_VL_CREATING] = "Crt",
440 [AFS_VL_VALID] = "Val",
441 [AFS_VL_NO_VOLUME] = "NoV",
442 [AFS_VL_UPDATING] = "Upd",
443 [AFS_VL_VOLUME_DELETED] = "Del",
444 [AFS_VL_UNCERTAIN] = "Unc",
448 * display a header line followed by a load of volume lines
450 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
452 struct afs_cell *cell = m->private;
453 struct afs_vlocation *vlocation =
454 list_entry(v, struct afs_vlocation, link);
456 /* display header on line 1 */
457 if (v == &cell->vl_list) {
458 seq_puts(m, "USE STT VLID[0] VLID[1] VLID[2] NAME\n");
459 return 0;
462 /* display one cell per line on subsequent lines */
463 seq_printf(m, "%3d %s %08x %08x %08x %s\n",
464 atomic_read(&vlocation->usage),
465 afs_vlocation_states[vlocation->state],
466 vlocation->vldb.vid[0],
467 vlocation->vldb.vid[1],
468 vlocation->vldb.vid[2],
469 vlocation->vldb.name);
471 return 0;
475 * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
476 * location server
478 static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
480 struct afs_cell *cell;
481 struct seq_file *m;
482 int ret;
484 cell = PDE_DATA(inode);
485 if (!cell)
486 return -ENOENT;
488 ret = seq_open(file, &afs_proc_cell_vlservers_ops);
489 if (ret<0)
490 return ret;
492 m = file->private_data;
493 m->private = cell;
495 return 0;
499 * set up the iterator to start reading from the cells list and return the
500 * first item
502 static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
504 struct afs_cell *cell = m->private;
505 loff_t pos = *_pos;
507 _enter("cell=%p pos=%Ld", cell, *_pos);
509 /* lock the list against modification */
510 down_read(&cell->vl_sem);
512 /* allow for the header line */
513 if (!pos)
514 return (void *) 1;
515 pos--;
517 if (pos >= cell->vl_naddrs)
518 return NULL;
520 return &cell->vl_addrs[pos];
524 * move to next cell in cells list
526 static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
527 loff_t *_pos)
529 struct afs_cell *cell = p->private;
530 loff_t pos;
532 _enter("cell=%p{nad=%u} pos=%Ld", cell, cell->vl_naddrs, *_pos);
534 pos = *_pos;
535 (*_pos)++;
536 if (pos >= cell->vl_naddrs)
537 return NULL;
539 return &cell->vl_addrs[pos];
543 * clean up after reading from the cells list
545 static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
547 struct afs_cell *cell = p->private;
549 up_read(&cell->vl_sem);
553 * display a header line followed by a load of volume lines
555 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
557 struct in_addr *addr = v;
559 /* display header on line 1 */
560 if (v == (struct in_addr *) 1) {
561 seq_puts(m, "ADDRESS\n");
562 return 0;
565 /* display one cell per line on subsequent lines */
566 seq_printf(m, "%pI4\n", &addr->s_addr);
567 return 0;
571 * open "/proc/fs/afs/<cell>/servers" which provides a summary of active
572 * servers
574 static int afs_proc_cell_servers_open(struct inode *inode, struct file *file)
576 struct afs_cell *cell;
577 struct seq_file *m;
578 int ret;
580 cell = PDE_DATA(inode);
581 if (!cell)
582 return -ENOENT;
584 ret = seq_open(file, &afs_proc_cell_servers_ops);
585 if (ret < 0)
586 return ret;
588 m = file->private_data;
589 m->private = cell;
590 return 0;
594 * set up the iterator to start reading from the cells list and return the
595 * first item
597 static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos)
598 __acquires(m->private->servers_lock)
600 struct afs_cell *cell = m->private;
602 _enter("cell=%p pos=%Ld", cell, *_pos);
604 /* lock the list against modification */
605 read_lock(&cell->servers_lock);
606 return seq_list_start_head(&cell->servers, *_pos);
610 * move to next cell in cells list
612 static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
613 loff_t *_pos)
615 struct afs_cell *cell = p->private;
617 _enter("cell=%p pos=%Ld", cell, *_pos);
618 return seq_list_next(v, &cell->servers, _pos);
622 * clean up after reading from the cells list
624 static void afs_proc_cell_servers_stop(struct seq_file *p, void *v)
625 __releases(p->private->servers_lock)
627 struct afs_cell *cell = p->private;
629 read_unlock(&cell->servers_lock);
633 * display a header line followed by a load of volume lines
635 static int afs_proc_cell_servers_show(struct seq_file *m, void *v)
637 struct afs_cell *cell = m->private;
638 struct afs_server *server = list_entry(v, struct afs_server, link);
639 char ipaddr[20];
641 /* display header on line 1 */
642 if (v == &cell->servers) {
643 seq_puts(m, "USE ADDR STATE\n");
644 return 0;
647 /* display one cell per line on subsequent lines */
648 sprintf(ipaddr, "%pI4", &server->addr);
649 seq_printf(m, "%3d %-15.15s %5d\n",
650 atomic_read(&server->usage), ipaddr, server->fs_state);
652 return 0;