blob: 43165009428da56c51b47ae9d8bb4b97310c485f [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 Woodhouse44d1b982008-06-05 22:46:18 -070013 * David Woodhouse <dwmw2@infradead.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 *
15 */
16
17#include <linux/kernel.h>
18#include <linux/module.h>
wangleibec5eb62010-08-11 09:38:04 +010019#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/init.h>
21#include <linux/slab.h>
22#include <linux/fs.h>
23#include <linux/pagemap.h>
David Howells80c72fe2007-05-03 03:11:29 -070024#include <linux/parser.h>
David Howells45222b92007-05-10 22:22:20 -070025#include <linux/statfs.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040026#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "internal.h"
28
29#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
30
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070031static void afs_i_init_once(void *foo);
Al Virof7442b32010-07-26 14:16:21 +040032static struct dentry *afs_mount(struct file_system_type *fs_type,
33 int flags, const char *dev_name, void *data);
Al Virodde194a2011-06-12 16:01:21 -040034static void afs_kill_super(struct super_block *sb);
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_destroy_inode(struct inode *inode);
David Howells45222b92007-05-10 22:22:20 -070037static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -040039struct file_system_type afs_fs_type = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 .owner = THIS_MODULE,
41 .name = "afs",
Al Virof7442b32010-07-26 14:16:21 +040042 .mount = afs_mount,
Al Virodde194a2011-06-12 16:01:21 -040043 .kill_sb = afs_kill_super,
David Howells80c72fe2007-05-03 03:11:29 -070044 .fs_flags = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -070045};
46
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080047static const struct super_operations afs_super_ops = {
David Howells45222b92007-05-10 22:22:20 -070048 .statfs = afs_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 .alloc_inode = afs_alloc_inode,
wangleibec5eb62010-08-11 09:38:04 +010050 .drop_inode = afs_drop_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 .destroy_inode = afs_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -040052 .evict_inode = afs_evict_inode,
Miklos Szeredi969729d2008-02-08 04:21:37 -080053 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -070054};
55
Christoph Lametere18b8902006-12-06 20:33:20 -080056static struct kmem_cache *afs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057static atomic_t afs_count_active_inodes;
58
David Howells80c72fe2007-05-03 03:11:29 -070059enum {
60 afs_no_opt,
61 afs_opt_cell,
62 afs_opt_rwpath,
63 afs_opt_vol,
wangleibec5eb62010-08-11 09:38:04 +010064 afs_opt_autocell,
David Howells80c72fe2007-05-03 03:11:29 -070065};
66
Steven Whitehousea447c092008-10-13 10:46:57 +010067static const match_table_t afs_options_list = {
David Howells80c72fe2007-05-03 03:11:29 -070068 { afs_opt_cell, "cell=%s" },
69 { afs_opt_rwpath, "rwpath" },
70 { afs_opt_vol, "vol=%s" },
wangleibec5eb62010-08-11 09:38:04 +010071 { afs_opt_autocell, "autocell" },
David Howells80c72fe2007-05-03 03:11:29 -070072 { 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,
Paul Mundt20c2df82007-07-20 10:11:58 +090092 afs_i_init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 if (!afs_inode_cachep) {
94 printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
95 return ret;
96 }
97
98 /* now export our filesystem to lesser mortals */
99 ret = register_filesystem(&afs_fs_type);
100 if (ret < 0) {
101 kmem_cache_destroy(afs_inode_cachep);
David Howells08e0e7c2007-04-26 15:55:03 -0700102 _leave(" = %d", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return ret;
104 }
105
David Howells08e0e7c2007-04-26 15:55:03 -0700106 _leave(" = 0");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 return 0;
David Howellsec268152007-04-26 15:49:28 -0700108}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110/*
111 * clean up the filesystem
112 */
113void __exit afs_fs_exit(void)
114{
David Howells08e0e7c2007-04-26 15:55:03 -0700115 _enter("");
116
117 afs_mntpt_kill_timer();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 unregister_filesystem(&afs_fs_type);
119
120 if (atomic_read(&afs_count_active_inodes) != 0) {
121 printk("kAFS: %d active inode objects still present\n",
122 atomic_read(&afs_count_active_inodes));
123 BUG();
124 }
125
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000126 /*
127 * Make sure all delayed rcu free inodes are flushed before we
128 * destroy cache.
129 */
130 rcu_barrier();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 kmem_cache_destroy(afs_inode_cachep);
David Howells08e0e7c2007-04-26 15:55:03 -0700132 _leave("");
David Howellsec268152007-04-26 15:49:28 -0700133}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 * parse the mount options
137 * - this function has been shamelessly adapted from the ext3 fs which
138 * shamelessly adapted it from the msdos fs
139 */
David Howells00d3b7a2007-04-26 15:57:07 -0700140static int afs_parse_options(struct afs_mount_params *params,
141 char *options, const char **devname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
David Howells08e0e7c2007-04-26 15:55:03 -0700143 struct afs_cell *cell;
David Howells80c72fe2007-05-03 03:11:29 -0700144 substring_t args[MAX_OPT_ARGS];
145 char *p;
146 int token;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 _enter("%s", options);
149
150 options[PAGE_SIZE - 1] = 0;
151
David Howells80c72fe2007-05-03 03:11:29 -0700152 while ((p = strsep(&options, ","))) {
153 if (!*p)
154 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
David Howells80c72fe2007-05-03 03:11:29 -0700156 token = match_token(p, afs_options_list, args);
157 switch (token) {
158 case afs_opt_cell:
159 cell = afs_cell_lookup(args[0].from,
wangleibec5eb62010-08-11 09:38:04 +0100160 args[0].to - args[0].from,
161 false);
David Howells08e0e7c2007-04-26 15:55:03 -0700162 if (IS_ERR(cell))
163 return PTR_ERR(cell);
David Howells00d3b7a2007-04-26 15:57:07 -0700164 afs_put_cell(params->cell);
165 params->cell = cell;
David Howells80c72fe2007-05-03 03:11:29 -0700166 break;
167
168 case afs_opt_rwpath:
169 params->rwpath = 1;
170 break;
171
172 case afs_opt_vol:
173 *devname = args[0].from;
174 break;
175
wangleibec5eb62010-08-11 09:38:04 +0100176 case afs_opt_autocell:
177 params->autocell = 1;
178 break;
179
David Howells80c72fe2007-05-03 03:11:29 -0700180 default:
181 printk(KERN_ERR "kAFS:"
182 " Unknown or invalid mount option: '%s'\n", p);
183 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186
David Howells80c72fe2007-05-03 03:11:29 -0700187 _leave(" = 0");
188 return 0;
David Howellsec268152007-04-26 15:49:28 -0700189}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191/*
David Howells00d3b7a2007-04-26 15:57:07 -0700192 * parse a device name to get cell name, volume name, volume type and R/W
193 * selector
194 * - this can be one of the following:
195 * "%[cell:]volume[.]" R/W volume
196 * "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),
197 * or R/W (rwpath=1) volume
198 * "%[cell:]volume.readonly" R/O volume
199 * "#[cell:]volume.readonly" R/O volume
200 * "%[cell:]volume.backup" Backup volume
201 * "#[cell:]volume.backup" Backup volume
202 */
203static int afs_parse_device_name(struct afs_mount_params *params,
204 const char *name)
205{
206 struct afs_cell *cell;
207 const char *cellname, *suffix;
208 int cellnamesz;
209
210 _enter(",%s", name);
211
212 if (!name) {
213 printk(KERN_ERR "kAFS: no volume name specified\n");
214 return -EINVAL;
215 }
216
217 if ((name[0] != '%' && name[0] != '#') || !name[1]) {
218 printk(KERN_ERR "kAFS: unparsable volume name\n");
219 return -EINVAL;
220 }
221
222 /* determine the type of volume we're looking for */
223 params->type = AFSVL_ROVOL;
224 params->force = false;
225 if (params->rwpath || name[0] == '%') {
226 params->type = AFSVL_RWVOL;
227 params->force = true;
228 }
229 name++;
230
231 /* split the cell name out if there is one */
232 params->volname = strchr(name, ':');
233 if (params->volname) {
234 cellname = name;
235 cellnamesz = params->volname - name;
236 params->volname++;
237 } else {
238 params->volname = name;
239 cellname = NULL;
240 cellnamesz = 0;
241 }
242
243 /* the volume type is further affected by a possible suffix */
244 suffix = strrchr(params->volname, '.');
245 if (suffix) {
246 if (strcmp(suffix, ".readonly") == 0) {
247 params->type = AFSVL_ROVOL;
248 params->force = true;
249 } else if (strcmp(suffix, ".backup") == 0) {
250 params->type = AFSVL_BACKVOL;
251 params->force = true;
252 } else if (suffix[1] == 0) {
253 } else {
254 suffix = NULL;
255 }
256 }
257
258 params->volnamesz = suffix ?
259 suffix - params->volname : strlen(params->volname);
260
261 _debug("cell %*.*s [%p]",
262 cellnamesz, cellnamesz, cellname ?: "", params->cell);
263
264 /* lookup the cell record */
265 if (cellname || !params->cell) {
wangleibec5eb62010-08-11 09:38:04 +0100266 cell = afs_cell_lookup(cellname, cellnamesz, true);
David Howells00d3b7a2007-04-26 15:57:07 -0700267 if (IS_ERR(cell)) {
wangleibec5eb62010-08-11 09:38:04 +0100268 printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n",
269 cellnamesz, cellnamesz, cellname ?: "");
David Howells00d3b7a2007-04-26 15:57:07 -0700270 return PTR_ERR(cell);
271 }
272 afs_put_cell(params->cell);
273 params->cell = cell;
274 }
275
276 _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
277 params->cell->name, params->cell,
278 params->volnamesz, params->volnamesz, params->volname,
279 suffix ?: "-", params->type, params->force ? " FORCE" : "");
280
281 return 0;
282}
283
284/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 * check a superblock to see if it's the one we're looking for
286 */
287static int afs_test_super(struct super_block *sb, void *data)
288{
Al Virodde194a2011-06-12 16:01:21 -0400289 struct afs_super_info *as1 = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 struct afs_super_info *as = sb->s_fs_info;
291
Al Virodde194a2011-06-12 16:01:21 -0400292 return as->volume == as1->volume;
293}
294
295static int afs_set_super(struct super_block *sb, void *data)
296{
297 sb->s_fs_info = data;
298 return set_anon_super(sb, NULL);
David Howellsec268152007-04-26 15:49:28 -0700299}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301/*
302 * fill in the superblock
303 */
Al Virodde194a2011-06-12 16:01:21 -0400304static int afs_fill_super(struct super_block *sb,
305 struct afs_mount_params *params)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
Al Virodde194a2011-06-12 16:01:21 -0400307 struct afs_super_info *as = sb->s_fs_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 struct afs_fid fid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 struct inode *inode = NULL;
310 int ret;
311
David Howells08e0e7c2007-04-26 15:55:03 -0700312 _enter("");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 /* fill in the superblock */
315 sb->s_blocksize = PAGE_CACHE_SIZE;
316 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
317 sb->s_magic = AFS_FS_MAGIC;
318 sb->s_op = &afs_super_ops;
Jens Axboee1da0222010-04-22 11:58:18 +0200319 sb->s_bdi = &as->volume->bdi;
David Howells2e41ae22011-06-14 00:38:44 +0100320 strlcpy(sb->s_id, as->volume->vlocation->vldb.name, sizeof(sb->s_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322 /* allocate the root inode and dentry */
323 fid.vid = as->volume->vid;
324 fid.vnode = 1;
325 fid.unique = 1;
David Howells260a9802007-04-26 15:59:35 -0700326 inode = afs_iget(sb, params->key, &fid, NULL, NULL);
David Howells08e0e7c2007-04-26 15:55:03 -0700327 if (IS_ERR(inode))
Al Virodde194a2011-06-12 16:01:21 -0400328 return PTR_ERR(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
wangleibec5eb62010-08-11 09:38:04 +0100330 if (params->autocell)
331 set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 ret = -ENOMEM;
Al Viro48fde702012-01-08 22:15:13 -0500334 sb->s_root = d_make_root(inode);
335 if (!sb->s_root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 goto error;
337
Al Virod61dcce2011-01-12 20:04:20 -0500338 sb->s_d_op = &afs_fs_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
David Howells08e0e7c2007-04-26 15:55:03 -0700340 _leave(" = 0");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 return 0;
342
David Howellsec268152007-04-26 15:49:28 -0700343error:
David Howells08e0e7c2007-04-26 15:55:03 -0700344 _leave(" = %d", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 return ret;
David Howellsec268152007-04-26 15:49:28 -0700346}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348/*
349 * get an AFS superblock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 */
Al Virof7442b32010-07-26 14:16:21 +0400351static struct dentry *afs_mount(struct file_system_type *fs_type,
352 int flags, const char *dev_name, void *options)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
354 struct afs_mount_params params;
355 struct super_block *sb;
David Howells08e0e7c2007-04-26 15:55:03 -0700356 struct afs_volume *vol;
David Howells00d3b7a2007-04-26 15:57:07 -0700357 struct key *key;
Miklos Szeredi969729d2008-02-08 04:21:37 -0800358 char *new_opts = kstrdup(options, GFP_KERNEL);
Al Virodde194a2011-06-12 16:01:21 -0400359 struct afs_super_info *as;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 int ret;
361
362 _enter(",,%s,%p", dev_name, options);
363
364 memset(&params, 0, sizeof(params));
365
David Howells00d3b7a2007-04-26 15:57:07 -0700366 /* parse the options and device name */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 if (options) {
David Howells00d3b7a2007-04-26 15:57:07 -0700368 ret = afs_parse_options(&params, options, &dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 if (ret < 0)
370 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 }
372
David Howells00d3b7a2007-04-26 15:57:07 -0700373 ret = afs_parse_device_name(&params, dev_name);
374 if (ret < 0)
375 goto error;
376
377 /* try and do the mount securely */
378 key = afs_request_key(params.cell);
379 if (IS_ERR(key)) {
380 _leave(" = %ld [key]", PTR_ERR(key));
381 ret = PTR_ERR(key);
382 goto error;
383 }
384 params.key = key;
385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 /* parse the device name */
David Howells00d3b7a2007-04-26 15:57:07 -0700387 vol = afs_volume_lookup(&params);
David Howells08e0e7c2007-04-26 15:55:03 -0700388 if (IS_ERR(vol)) {
389 ret = PTR_ERR(vol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 goto error;
David Howells08e0e7c2007-04-26 15:55:03 -0700391 }
Al Virodde194a2011-06-12 16:01:21 -0400392
393 /* allocate a superblock info record */
394 as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
395 if (!as) {
396 ret = -ENOMEM;
397 afs_put_volume(vol);
398 goto error;
399 }
400 as->volume = vol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 /* allocate a deviceless superblock */
David Howells9249e172012-06-25 12:55:37 +0100403 sb = sget(fs_type, afs_test_super, afs_set_super, flags, as);
David Howells08e0e7c2007-04-26 15:55:03 -0700404 if (IS_ERR(sb)) {
405 ret = PTR_ERR(sb);
Al Virodde194a2011-06-12 16:01:21 -0400406 afs_put_volume(vol);
407 kfree(as);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 goto error;
David Howells08e0e7c2007-04-26 15:55:03 -0700409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
David Howells436058a2007-04-26 15:56:24 -0700411 if (!sb->s_root) {
412 /* initial superblock/root creation */
413 _debug("create");
David Howells436058a2007-04-26 15:56:24 -0700414 ret = afs_fill_super(sb, &params);
415 if (ret < 0) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400416 deactivate_locked_super(sb);
David Howells436058a2007-04-26 15:56:24 -0700417 goto error;
418 }
Al Viro2a32ceb2009-05-08 16:05:57 -0400419 save_mount_options(sb, new_opts);
David Howells436058a2007-04-26 15:56:24 -0700420 sb->s_flags |= MS_ACTIVE;
421 } else {
422 _debug("reuse");
423 ASSERTCMP(sb->s_flags, &, MS_ACTIVE);
Al Virodde194a2011-06-12 16:01:21 -0400424 afs_put_volume(vol);
425 kfree(as);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
David Howells00d3b7a2007-04-26 15:57:07 -0700428 afs_put_cell(params.cell);
Al Viro2a32ceb2009-05-08 16:05:57 -0400429 kfree(new_opts);
David Howells08e0e7c2007-04-26 15:55:03 -0700430 _leave(" = 0 [%p]", sb);
Al Virof7442b32010-07-26 14:16:21 +0400431 return dget(sb->s_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
David Howellsec268152007-04-26 15:49:28 -0700433error:
David Howells00d3b7a2007-04-26 15:57:07 -0700434 afs_put_cell(params.cell);
435 key_put(params.key);
Miklos Szeredi969729d2008-02-08 04:21:37 -0800436 kfree(new_opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 _leave(" = %d", ret);
Al Virof7442b32010-07-26 14:16:21 +0400438 return ERR_PTR(ret);
David Howellsec268152007-04-26 15:49:28 -0700439}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Al Virodde194a2011-06-12 16:01:21 -0400441static void afs_kill_super(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
443 struct afs_super_info *as = sb->s_fs_info;
Al Virodde194a2011-06-12 16:01:21 -0400444 kill_anon_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 afs_put_volume(as->volume);
Al Virodde194a2011-06-12 16:01:21 -0400446 kfree(as);
David Howellsec268152007-04-26 15:49:28 -0700447}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449/*
450 * initialise an inode cache slab element prior to any use
451 */
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700452static void afs_i_init_once(void *_vnode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
David Howellsec268152007-04-26 15:49:28 -0700454 struct afs_vnode *vnode = _vnode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
Christoph Lametera35afb82007-05-16 22:10:57 -0700456 memset(vnode, 0, sizeof(*vnode));
457 inode_init_once(&vnode->vfs_inode);
458 init_waitqueue_head(&vnode->update_waitq);
459 mutex_init(&vnode->permits_lock);
460 mutex_init(&vnode->validate_lock);
461 spin_lock_init(&vnode->writeback_lock);
462 spin_lock_init(&vnode->lock);
463 INIT_LIST_HEAD(&vnode->writebacks);
David Howellse8d6c552007-07-15 23:40:12 -0700464 INIT_LIST_HEAD(&vnode->pending_locks);
465 INIT_LIST_HEAD(&vnode->granted_locks);
466 INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
Christoph Lametera35afb82007-05-16 22:10:57 -0700467 INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
David Howellsec268152007-04-26 15:49:28 -0700468}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470/*
471 * allocate an AFS inode struct from our slab cache
472 */
473static struct inode *afs_alloc_inode(struct super_block *sb)
474{
475 struct afs_vnode *vnode;
476
David Howellsec268152007-04-26 15:49:28 -0700477 vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 if (!vnode)
479 return NULL;
480
481 atomic_inc(&afs_count_active_inodes);
482
483 memset(&vnode->fid, 0, sizeof(vnode->fid));
484 memset(&vnode->status, 0, sizeof(vnode->status));
485
486 vnode->volume = NULL;
487 vnode->update_cnt = 0;
David Howells260a9802007-04-26 15:59:35 -0700488 vnode->flags = 1 << AFS_VNODE_UNSET;
David Howells08e0e7c2007-04-26 15:55:03 -0700489 vnode->cb_promised = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
David Howells0f300ca2007-05-10 22:22:20 -0700491 _leave(" = %p", &vnode->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 return &vnode->vfs_inode;
David Howellsec268152007-04-26 15:49:28 -0700493}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100495static void afs_i_callback(struct rcu_head *head)
496{
497 struct inode *inode = container_of(head, struct inode, i_rcu);
498 struct afs_vnode *vnode = AFS_FS_I(inode);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100499 kmem_cache_free(afs_inode_cachep, vnode);
500}
501
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502/*
503 * destroy an AFS inode struct
504 */
505static void afs_destroy_inode(struct inode *inode)
506{
David Howells08e0e7c2007-04-26 15:55:03 -0700507 struct afs_vnode *vnode = AFS_FS_I(inode);
508
David Howells0f300ca2007-05-10 22:22:20 -0700509 _enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
David Howells08e0e7c2007-04-26 15:55:03 -0700511 _debug("DESTROY INODE %p", inode);
512
513 ASSERTCMP(vnode->server, ==, NULL);
514
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100515 call_rcu(&inode->i_rcu, afs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 atomic_dec(&afs_count_active_inodes);
David Howellsec268152007-04-26 15:49:28 -0700517}
David Howells45222b92007-05-10 22:22:20 -0700518
519/*
520 * return information about an AFS volume
521 */
522static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
523{
524 struct afs_volume_status vs;
525 struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
526 struct key *key;
527 int ret;
528
529 key = afs_request_key(vnode->volume->cell);
530 if (IS_ERR(key))
531 return PTR_ERR(key);
532
533 ret = afs_vnode_get_volume_status(vnode, key, &vs);
534 key_put(key);
535 if (ret < 0) {
536 _leave(" = %d", ret);
537 return ret;
538 }
539
540 buf->f_type = dentry->d_sb->s_magic;
541 buf->f_bsize = AFS_BLOCK_SIZE;
542 buf->f_namelen = AFSNAMEMAX - 1;
543
544 if (vs.max_quota == 0)
545 buf->f_blocks = vs.part_max_blocks;
546 else
547 buf->f_blocks = vs.max_quota;
548 buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
549 return 0;
550}