blob: 993cdf1cce3a494b40a7df32166813a17756bd4d [file] [log] [blame]
David Howellsec268152007-04-26 15:49:28 -07001/* AFS superblock handling
2 *
David Howells08e0e7c2007-04-26 15:55:03 -07003 * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * This software may be freely redistributed under the terms of the
6 * GNU General Public License.
7 *
8 * You should have received a copy of the GNU General Public License
9 * along with this program; if not, write to the Free Software
10 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
11 *
12 * Authors: David Howells <dhowells@redhat.com>
David Howellsec268152007-04-26 15:49:28 -070013 * David Woodhouse <dwmw2@redhat.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 *
15 */
16
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/fs.h>
22#include <linux/pagemap.h>
David Howells80c72fe2007-05-03 03:11:29 -070023#include <linux/parser.h>
David Howells45222b92007-05-10 22:22:20 -070024#include <linux/statfs.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040025#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "internal.h"
27
28#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
29
Christoph Lametere18b8902006-12-06 20:33:20 -080030static void afs_i_init_once(void *foo, struct kmem_cache *cachep,
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 unsigned long flags);
David Howells454e2392006-06-23 02:02:57 -070032static int afs_get_sb(struct file_system_type *fs_type,
33 int flags, const char *dev_name,
34 void *data, struct vfsmount *mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035static struct inode *afs_alloc_inode(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036static void afs_put_super(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037static void afs_destroy_inode(struct inode *inode);
David Howells45222b92007-05-10 22:22:20 -070038static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -040040struct file_system_type afs_fs_type = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 .owner = THIS_MODULE,
42 .name = "afs",
43 .get_sb = afs_get_sb,
44 .kill_sb = kill_anon_super,
David Howells80c72fe2007-05-03 03:11:29 -070045 .fs_flags = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -070046};
47
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080048static const struct super_operations afs_super_ops = {
David Howells45222b92007-05-10 22:22:20 -070049 .statfs = afs_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 .alloc_inode = afs_alloc_inode,
David Howells31143d52007-05-09 02:33:46 -070051 .write_inode = afs_write_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 .destroy_inode = afs_destroy_inode,
53 .clear_inode = afs_clear_inode,
David Howells08e0e7c2007-04-26 15:55:03 -070054 .umount_begin = afs_umount_begin,
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 .put_super = afs_put_super,
56};
57
Christoph Lametere18b8902006-12-06 20:33:20 -080058static struct kmem_cache *afs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059static atomic_t afs_count_active_inodes;
60
David Howells80c72fe2007-05-03 03:11:29 -070061enum {
62 afs_no_opt,
63 afs_opt_cell,
64 afs_opt_rwpath,
65 afs_opt_vol,
66};
67
David Howells31143d52007-05-09 02:33:46 -070068static match_table_t afs_options_list = {
David Howells80c72fe2007-05-03 03:11:29 -070069 { afs_opt_cell, "cell=%s" },
70 { afs_opt_rwpath, "rwpath" },
71 { afs_opt_vol, "vol=%s" },
72 { afs_no_opt, NULL },
73};
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075/*
76 * initialise the filesystem
77 */
78int __init afs_fs_init(void)
79{
80 int ret;
81
82 _enter("");
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 /* create ourselves an inode cache */
85 atomic_set(&afs_count_active_inodes, 0);
86
87 ret = -ENOMEM;
88 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
89 sizeof(struct afs_vnode),
90 0,
91 SLAB_HWCACHE_ALIGN,
92 afs_i_init_once,
93 NULL);
94 if (!afs_inode_cachep) {
95 printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
96 return ret;
97 }
98
99 /* now export our filesystem to lesser mortals */
100 ret = register_filesystem(&afs_fs_type);
101 if (ret < 0) {
102 kmem_cache_destroy(afs_inode_cachep);
David Howells08e0e7c2007-04-26 15:55:03 -0700103 _leave(" = %d", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 return ret;
105 }
106
David Howells08e0e7c2007-04-26 15:55:03 -0700107 _leave(" = 0");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return 0;
David Howellsec268152007-04-26 15:49:28 -0700109}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111/*
112 * clean up the filesystem
113 */
114void __exit afs_fs_exit(void)
115{
David Howells08e0e7c2007-04-26 15:55:03 -0700116 _enter("");
117
118 afs_mntpt_kill_timer();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 unregister_filesystem(&afs_fs_type);
120
121 if (atomic_read(&afs_count_active_inodes) != 0) {
122 printk("kAFS: %d active inode objects still present\n",
123 atomic_read(&afs_count_active_inodes));
124 BUG();
125 }
126
127 kmem_cache_destroy(afs_inode_cachep);
David Howells08e0e7c2007-04-26 15:55:03 -0700128 _leave("");
David Howellsec268152007-04-26 15:49:28 -0700129}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 * parse the mount options
133 * - this function has been shamelessly adapted from the ext3 fs which
134 * shamelessly adapted it from the msdos fs
135 */
David Howells00d3b7a2007-04-26 15:57:07 -0700136static int afs_parse_options(struct afs_mount_params *params,
137 char *options, const char **devname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138{
David Howells08e0e7c2007-04-26 15:55:03 -0700139 struct afs_cell *cell;
David Howells80c72fe2007-05-03 03:11:29 -0700140 substring_t args[MAX_OPT_ARGS];
141 char *p;
142 int token;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 _enter("%s", options);
145
146 options[PAGE_SIZE - 1] = 0;
147
David Howells80c72fe2007-05-03 03:11:29 -0700148 while ((p = strsep(&options, ","))) {
149 if (!*p)
150 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
David Howells80c72fe2007-05-03 03:11:29 -0700152 token = match_token(p, afs_options_list, args);
153 switch (token) {
154 case afs_opt_cell:
155 cell = afs_cell_lookup(args[0].from,
156 args[0].to - args[0].from);
David Howells08e0e7c2007-04-26 15:55:03 -0700157 if (IS_ERR(cell))
158 return PTR_ERR(cell);
David Howells00d3b7a2007-04-26 15:57:07 -0700159 afs_put_cell(params->cell);
160 params->cell = cell;
David Howells80c72fe2007-05-03 03:11:29 -0700161 break;
162
163 case afs_opt_rwpath:
164 params->rwpath = 1;
165 break;
166
167 case afs_opt_vol:
168 *devname = args[0].from;
169 break;
170
171 default:
172 printk(KERN_ERR "kAFS:"
173 " Unknown or invalid mount option: '%s'\n", p);
174 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 }
177
David Howells80c72fe2007-05-03 03:11:29 -0700178 _leave(" = 0");
179 return 0;
David Howellsec268152007-04-26 15:49:28 -0700180}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182/*
David Howells00d3b7a2007-04-26 15:57:07 -0700183 * parse a device name to get cell name, volume name, volume type and R/W
184 * selector
185 * - this can be one of the following:
186 * "%[cell:]volume[.]" R/W volume
187 * "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),
188 * or R/W (rwpath=1) volume
189 * "%[cell:]volume.readonly" R/O volume
190 * "#[cell:]volume.readonly" R/O volume
191 * "%[cell:]volume.backup" Backup volume
192 * "#[cell:]volume.backup" Backup volume
193 */
194static int afs_parse_device_name(struct afs_mount_params *params,
195 const char *name)
196{
197 struct afs_cell *cell;
198 const char *cellname, *suffix;
199 int cellnamesz;
200
201 _enter(",%s", name);
202
203 if (!name) {
204 printk(KERN_ERR "kAFS: no volume name specified\n");
205 return -EINVAL;
206 }
207
208 if ((name[0] != '%' && name[0] != '#') || !name[1]) {
209 printk(KERN_ERR "kAFS: unparsable volume name\n");
210 return -EINVAL;
211 }
212
213 /* determine the type of volume we're looking for */
214 params->type = AFSVL_ROVOL;
215 params->force = false;
216 if (params->rwpath || name[0] == '%') {
217 params->type = AFSVL_RWVOL;
218 params->force = true;
219 }
220 name++;
221
222 /* split the cell name out if there is one */
223 params->volname = strchr(name, ':');
224 if (params->volname) {
225 cellname = name;
226 cellnamesz = params->volname - name;
227 params->volname++;
228 } else {
229 params->volname = name;
230 cellname = NULL;
231 cellnamesz = 0;
232 }
233
234 /* the volume type is further affected by a possible suffix */
235 suffix = strrchr(params->volname, '.');
236 if (suffix) {
237 if (strcmp(suffix, ".readonly") == 0) {
238 params->type = AFSVL_ROVOL;
239 params->force = true;
240 } else if (strcmp(suffix, ".backup") == 0) {
241 params->type = AFSVL_BACKVOL;
242 params->force = true;
243 } else if (suffix[1] == 0) {
244 } else {
245 suffix = NULL;
246 }
247 }
248
249 params->volnamesz = suffix ?
250 suffix - params->volname : strlen(params->volname);
251
252 _debug("cell %*.*s [%p]",
253 cellnamesz, cellnamesz, cellname ?: "", params->cell);
254
255 /* lookup the cell record */
256 if (cellname || !params->cell) {
257 cell = afs_cell_lookup(cellname, cellnamesz);
258 if (IS_ERR(cell)) {
259 printk(KERN_ERR "kAFS: unable to lookup cell '%s'\n",
260 cellname ?: "");
261 return PTR_ERR(cell);
262 }
263 afs_put_cell(params->cell);
264 params->cell = cell;
265 }
266
267 _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
268 params->cell->name, params->cell,
269 params->volnamesz, params->volnamesz, params->volname,
270 suffix ?: "-", params->type, params->force ? " FORCE" : "");
271
272 return 0;
273}
274
275/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 * check a superblock to see if it's the one we're looking for
277 */
278static int afs_test_super(struct super_block *sb, void *data)
279{
280 struct afs_mount_params *params = data;
281 struct afs_super_info *as = sb->s_fs_info;
282
283 return as->volume == params->volume;
David Howellsec268152007-04-26 15:49:28 -0700284}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286/*
287 * fill in the superblock
288 */
David Howells436058a2007-04-26 15:56:24 -0700289static int afs_fill_super(struct super_block *sb, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
291 struct afs_mount_params *params = data;
292 struct afs_super_info *as = NULL;
293 struct afs_fid fid;
294 struct dentry *root = NULL;
295 struct inode *inode = NULL;
296 int ret;
297
David Howells08e0e7c2007-04-26 15:55:03 -0700298 _enter("");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 /* allocate a superblock info record */
Yan Burmanb593e482006-12-06 20:40:32 -0800301 as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 if (!as) {
303 _leave(" = -ENOMEM");
304 return -ENOMEM;
305 }
306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 afs_get_volume(params->volume);
308 as->volume = params->volume;
309
310 /* fill in the superblock */
311 sb->s_blocksize = PAGE_CACHE_SIZE;
312 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
313 sb->s_magic = AFS_FS_MAGIC;
314 sb->s_op = &afs_super_ops;
315 sb->s_fs_info = as;
316
317 /* allocate the root inode and dentry */
318 fid.vid = as->volume->vid;
319 fid.vnode = 1;
320 fid.unique = 1;
David Howells260a9802007-04-26 15:59:35 -0700321 inode = afs_iget(sb, params->key, &fid, NULL, NULL);
David Howells08e0e7c2007-04-26 15:55:03 -0700322 if (IS_ERR(inode))
323 goto error_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325 ret = -ENOMEM;
326 root = d_alloc_root(inode);
327 if (!root)
328 goto error;
329
330 sb->s_root = root;
331
David Howells08e0e7c2007-04-26 15:55:03 -0700332 _leave(" = 0");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 return 0;
334
David Howells08e0e7c2007-04-26 15:55:03 -0700335error_inode:
336 ret = PTR_ERR(inode);
337 inode = NULL;
David Howellsec268152007-04-26 15:49:28 -0700338error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 iput(inode);
340 afs_put_volume(as->volume);
341 kfree(as);
342
343 sb->s_fs_info = NULL;
344
David Howells08e0e7c2007-04-26 15:55:03 -0700345 _leave(" = %d", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 return ret;
David Howellsec268152007-04-26 15:49:28 -0700347}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349/*
350 * get an AFS superblock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 */
David Howells454e2392006-06-23 02:02:57 -0700352static int afs_get_sb(struct file_system_type *fs_type,
353 int flags,
354 const char *dev_name,
355 void *options,
356 struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
358 struct afs_mount_params params;
359 struct super_block *sb;
David Howells08e0e7c2007-04-26 15:55:03 -0700360 struct afs_volume *vol;
David Howells00d3b7a2007-04-26 15:57:07 -0700361 struct key *key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 int ret;
363
364 _enter(",,%s,%p", dev_name, options);
365
366 memset(&params, 0, sizeof(params));
367
David Howells00d3b7a2007-04-26 15:57:07 -0700368 /* parse the options and device name */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 if (options) {
David Howells00d3b7a2007-04-26 15:57:07 -0700370 ret = afs_parse_options(&params, options, &dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 if (ret < 0)
372 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
374
David Howells00d3b7a2007-04-26 15:57:07 -0700375 ret = afs_parse_device_name(&params, dev_name);
376 if (ret < 0)
377 goto error;
378
379 /* try and do the mount securely */
380 key = afs_request_key(params.cell);
381 if (IS_ERR(key)) {
382 _leave(" = %ld [key]", PTR_ERR(key));
383 ret = PTR_ERR(key);
384 goto error;
385 }
386 params.key = key;
387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 /* parse the device name */
David Howells00d3b7a2007-04-26 15:57:07 -0700389 vol = afs_volume_lookup(&params);
David Howells08e0e7c2007-04-26 15:55:03 -0700390 if (IS_ERR(vol)) {
391 ret = PTR_ERR(vol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 goto error;
David Howells08e0e7c2007-04-26 15:55:03 -0700393 }
David Howells08e0e7c2007-04-26 15:55:03 -0700394 params.volume = vol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
396 /* allocate a deviceless superblock */
397 sb = sget(fs_type, afs_test_super, set_anon_super, &params);
David Howells08e0e7c2007-04-26 15:55:03 -0700398 if (IS_ERR(sb)) {
399 ret = PTR_ERR(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 goto error;
David Howells08e0e7c2007-04-26 15:55:03 -0700401 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
David Howells436058a2007-04-26 15:56:24 -0700403 if (!sb->s_root) {
404 /* initial superblock/root creation */
405 _debug("create");
406 sb->s_flags = flags;
407 ret = afs_fill_super(sb, &params);
408 if (ret < 0) {
409 up_write(&sb->s_umount);
410 deactivate_super(sb);
411 goto error;
412 }
413 sb->s_flags |= MS_ACTIVE;
414 } else {
415 _debug("reuse");
416 ASSERTCMP(sb->s_flags, &, MS_ACTIVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
David Howells436058a2007-04-26 15:56:24 -0700419 simple_set_mnt(mnt, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 afs_put_volume(params.volume);
David Howells00d3b7a2007-04-26 15:57:07 -0700421 afs_put_cell(params.cell);
David Howells08e0e7c2007-04-26 15:55:03 -0700422 _leave(" = 0 [%p]", sb);
David Howells454e2392006-06-23 02:02:57 -0700423 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
David Howellsec268152007-04-26 15:49:28 -0700425error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 afs_put_volume(params.volume);
David Howells00d3b7a2007-04-26 15:57:07 -0700427 afs_put_cell(params.cell);
428 key_put(params.key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 _leave(" = %d", ret);
David Howells454e2392006-06-23 02:02:57 -0700430 return ret;
David Howellsec268152007-04-26 15:49:28 -0700431}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433/*
434 * finish the unmounting process on the superblock
435 */
436static void afs_put_super(struct super_block *sb)
437{
438 struct afs_super_info *as = sb->s_fs_info;
439
440 _enter("");
441
442 afs_put_volume(as->volume);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444 _leave("");
David Howellsec268152007-04-26 15:49:28 -0700445}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447/*
448 * initialise an inode cache slab element prior to any use
449 */
Christoph Lametere18b8902006-12-06 20:33:20 -0800450static void afs_i_init_once(void *_vnode, struct kmem_cache *cachep,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 unsigned long flags)
452{
David Howellsec268152007-04-26 15:49:28 -0700453 struct afs_vnode *vnode = _vnode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Christoph Lametera35afb82007-05-16 22:10:57 -0700455 memset(vnode, 0, sizeof(*vnode));
456 inode_init_once(&vnode->vfs_inode);
457 init_waitqueue_head(&vnode->update_waitq);
458 mutex_init(&vnode->permits_lock);
459 mutex_init(&vnode->validate_lock);
460 spin_lock_init(&vnode->writeback_lock);
461 spin_lock_init(&vnode->lock);
462 INIT_LIST_HEAD(&vnode->writebacks);
David Howellse8d6c552007-07-15 23:40:12 -0700463 INIT_LIST_HEAD(&vnode->pending_locks);
464 INIT_LIST_HEAD(&vnode->granted_locks);
465 INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
Christoph Lametera35afb82007-05-16 22:10:57 -0700466 INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
David Howellsec268152007-04-26 15:49:28 -0700467}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469/*
470 * allocate an AFS inode struct from our slab cache
471 */
472static struct inode *afs_alloc_inode(struct super_block *sb)
473{
474 struct afs_vnode *vnode;
475
David Howellsec268152007-04-26 15:49:28 -0700476 vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 if (!vnode)
478 return NULL;
479
480 atomic_inc(&afs_count_active_inodes);
481
482 memset(&vnode->fid, 0, sizeof(vnode->fid));
483 memset(&vnode->status, 0, sizeof(vnode->status));
484
485 vnode->volume = NULL;
486 vnode->update_cnt = 0;
David Howells260a9802007-04-26 15:59:35 -0700487 vnode->flags = 1 << AFS_VNODE_UNSET;
David Howells08e0e7c2007-04-26 15:55:03 -0700488 vnode->cb_promised = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
David Howells0f300ca2007-05-10 22:22:20 -0700490 _leave(" = %p", &vnode->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 return &vnode->vfs_inode;
David Howellsec268152007-04-26 15:49:28 -0700492}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494/*
495 * destroy an AFS inode struct
496 */
497static void afs_destroy_inode(struct inode *inode)
498{
David Howells08e0e7c2007-04-26 15:55:03 -0700499 struct afs_vnode *vnode = AFS_FS_I(inode);
500
David Howells0f300ca2007-05-10 22:22:20 -0700501 _enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502
David Howells08e0e7c2007-04-26 15:55:03 -0700503 _debug("DESTROY INODE %p", inode);
504
505 ASSERTCMP(vnode->server, ==, NULL);
506
507 kmem_cache_free(afs_inode_cachep, vnode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 atomic_dec(&afs_count_active_inodes);
David Howellsec268152007-04-26 15:49:28 -0700509}
David Howells45222b92007-05-10 22:22:20 -0700510
511/*
512 * return information about an AFS volume
513 */
514static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
515{
516 struct afs_volume_status vs;
517 struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
518 struct key *key;
519 int ret;
520
521 key = afs_request_key(vnode->volume->cell);
522 if (IS_ERR(key))
523 return PTR_ERR(key);
524
525 ret = afs_vnode_get_volume_status(vnode, key, &vs);
526 key_put(key);
527 if (ret < 0) {
528 _leave(" = %d", ret);
529 return ret;
530 }
531
532 buf->f_type = dentry->d_sb->s_magic;
533 buf->f_bsize = AFS_BLOCK_SIZE;
534 buf->f_namelen = AFSNAMEMAX - 1;
535
536 if (vs.max_quota == 0)
537 buf->f_blocks = vs.part_max_blocks;
538 else
539 buf->f_blocks = vs.max_quota;
540 buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
541 return 0;
542}