blob: fb240e8766d63f7178374c40594881609201cae4 [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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034static struct inode *afs_alloc_inode(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035static void afs_put_super(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,
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 .kill_sb = kill_anon_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,
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 .put_super = afs_put_super,
Miklos Szeredi969729d2008-02-08 04:21:37 -080054 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -070055};
56
Christoph Lametere18b8902006-12-06 20:33:20 -080057static struct kmem_cache *afs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058static atomic_t afs_count_active_inodes;
59
David Howells80c72fe2007-05-03 03:11:29 -070060enum {
61 afs_no_opt,
62 afs_opt_cell,
63 afs_opt_rwpath,
64 afs_opt_vol,
wangleibec5eb62010-08-11 09:38:04 +010065 afs_opt_autocell,
David Howells80c72fe2007-05-03 03:11:29 -070066};
67
Steven Whitehousea447c092008-10-13 10:46:57 +010068static const 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" },
wangleibec5eb62010-08-11 09:38:04 +010072 { afs_opt_autocell, "autocell" },
David Howells80c72fe2007-05-03 03:11:29 -070073 { afs_no_opt, NULL },
74};
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076/*
77 * initialise the filesystem
78 */
79int __init afs_fs_init(void)
80{
81 int ret;
82
83 _enter("");
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 /* create ourselves an inode cache */
86 atomic_set(&afs_count_active_inodes, 0);
87
88 ret = -ENOMEM;
89 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
90 sizeof(struct afs_vnode),
91 0,
92 SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +090093 afs_i_init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 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,
wangleibec5eb62010-08-11 09:38:04 +0100156 args[0].to - args[0].from,
157 false);
David Howells08e0e7c2007-04-26 15:55:03 -0700158 if (IS_ERR(cell))
159 return PTR_ERR(cell);
David Howells00d3b7a2007-04-26 15:57:07 -0700160 afs_put_cell(params->cell);
161 params->cell = cell;
David Howells80c72fe2007-05-03 03:11:29 -0700162 break;
163
164 case afs_opt_rwpath:
165 params->rwpath = 1;
166 break;
167
168 case afs_opt_vol:
169 *devname = args[0].from;
170 break;
171
wangleibec5eb62010-08-11 09:38:04 +0100172 case afs_opt_autocell:
173 params->autocell = 1;
174 break;
175
David Howells80c72fe2007-05-03 03:11:29 -0700176 default:
177 printk(KERN_ERR "kAFS:"
178 " Unknown or invalid mount option: '%s'\n", p);
179 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 }
182
David Howells80c72fe2007-05-03 03:11:29 -0700183 _leave(" = 0");
184 return 0;
David Howellsec268152007-04-26 15:49:28 -0700185}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187/*
David Howells00d3b7a2007-04-26 15:57:07 -0700188 * parse a device name to get cell name, volume name, volume type and R/W
189 * selector
190 * - this can be one of the following:
191 * "%[cell:]volume[.]" R/W volume
192 * "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),
193 * or R/W (rwpath=1) volume
194 * "%[cell:]volume.readonly" R/O volume
195 * "#[cell:]volume.readonly" R/O volume
196 * "%[cell:]volume.backup" Backup volume
197 * "#[cell:]volume.backup" Backup volume
198 */
199static int afs_parse_device_name(struct afs_mount_params *params,
200 const char *name)
201{
202 struct afs_cell *cell;
203 const char *cellname, *suffix;
204 int cellnamesz;
205
206 _enter(",%s", name);
207
208 if (!name) {
209 printk(KERN_ERR "kAFS: no volume name specified\n");
210 return -EINVAL;
211 }
212
213 if ((name[0] != '%' && name[0] != '#') || !name[1]) {
214 printk(KERN_ERR "kAFS: unparsable volume name\n");
215 return -EINVAL;
216 }
217
218 /* determine the type of volume we're looking for */
219 params->type = AFSVL_ROVOL;
220 params->force = false;
221 if (params->rwpath || name[0] == '%') {
222 params->type = AFSVL_RWVOL;
223 params->force = true;
224 }
225 name++;
226
227 /* split the cell name out if there is one */
228 params->volname = strchr(name, ':');
229 if (params->volname) {
230 cellname = name;
231 cellnamesz = params->volname - name;
232 params->volname++;
233 } else {
234 params->volname = name;
235 cellname = NULL;
236 cellnamesz = 0;
237 }
238
239 /* the volume type is further affected by a possible suffix */
240 suffix = strrchr(params->volname, '.');
241 if (suffix) {
242 if (strcmp(suffix, ".readonly") == 0) {
243 params->type = AFSVL_ROVOL;
244 params->force = true;
245 } else if (strcmp(suffix, ".backup") == 0) {
246 params->type = AFSVL_BACKVOL;
247 params->force = true;
248 } else if (suffix[1] == 0) {
249 } else {
250 suffix = NULL;
251 }
252 }
253
254 params->volnamesz = suffix ?
255 suffix - params->volname : strlen(params->volname);
256
257 _debug("cell %*.*s [%p]",
258 cellnamesz, cellnamesz, cellname ?: "", params->cell);
259
260 /* lookup the cell record */
261 if (cellname || !params->cell) {
wangleibec5eb62010-08-11 09:38:04 +0100262 cell = afs_cell_lookup(cellname, cellnamesz, true);
David Howells00d3b7a2007-04-26 15:57:07 -0700263 if (IS_ERR(cell)) {
wangleibec5eb62010-08-11 09:38:04 +0100264 printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n",
265 cellnamesz, cellnamesz, cellname ?: "");
David Howells00d3b7a2007-04-26 15:57:07 -0700266 return PTR_ERR(cell);
267 }
268 afs_put_cell(params->cell);
269 params->cell = cell;
270 }
271
272 _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
273 params->cell->name, params->cell,
274 params->volnamesz, params->volnamesz, params->volname,
275 suffix ?: "-", params->type, params->force ? " FORCE" : "");
276
277 return 0;
278}
279
280/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 * check a superblock to see if it's the one we're looking for
282 */
283static int afs_test_super(struct super_block *sb, void *data)
284{
285 struct afs_mount_params *params = data;
286 struct afs_super_info *as = sb->s_fs_info;
287
288 return as->volume == params->volume;
David Howellsec268152007-04-26 15:49:28 -0700289}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291/*
292 * fill in the superblock
293 */
David Howells436058a2007-04-26 15:56:24 -0700294static int afs_fill_super(struct super_block *sb, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
296 struct afs_mount_params *params = data;
297 struct afs_super_info *as = NULL;
298 struct afs_fid fid;
299 struct dentry *root = NULL;
300 struct inode *inode = NULL;
301 int ret;
302
David Howells08e0e7c2007-04-26 15:55:03 -0700303 _enter("");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
305 /* allocate a superblock info record */
Yan Burmanb593e482006-12-06 20:40:32 -0800306 as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 if (!as) {
308 _leave(" = -ENOMEM");
309 return -ENOMEM;
310 }
311
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 afs_get_volume(params->volume);
313 as->volume = params->volume;
314
315 /* fill in the superblock */
316 sb->s_blocksize = PAGE_CACHE_SIZE;
317 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
318 sb->s_magic = AFS_FS_MAGIC;
319 sb->s_op = &afs_super_ops;
320 sb->s_fs_info = as;
Jens Axboee1da0222010-04-22 11:58:18 +0200321 sb->s_bdi = &as->volume->bdi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323 /* allocate the root inode and dentry */
324 fid.vid = as->volume->vid;
325 fid.vnode = 1;
326 fid.unique = 1;
David Howells260a9802007-04-26 15:59:35 -0700327 inode = afs_iget(sb, params->key, &fid, NULL, NULL);
David Howells08e0e7c2007-04-26 15:55:03 -0700328 if (IS_ERR(inode))
329 goto error_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
wangleibec5eb62010-08-11 09:38:04 +0100331 if (params->autocell)
332 set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 ret = -ENOMEM;
335 root = d_alloc_root(inode);
336 if (!root)
337 goto error;
338
Al Virod61dcce2011-01-12 20:04:20 -0500339 sb->s_d_op = &afs_fs_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 sb->s_root = root;
341
David Howells08e0e7c2007-04-26 15:55:03 -0700342 _leave(" = 0");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 return 0;
344
David Howells08e0e7c2007-04-26 15:55:03 -0700345error_inode:
346 ret = PTR_ERR(inode);
347 inode = NULL;
David Howellsec268152007-04-26 15:49:28 -0700348error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 iput(inode);
350 afs_put_volume(as->volume);
351 kfree(as);
352
353 sb->s_fs_info = NULL;
354
David Howells08e0e7c2007-04-26 15:55:03 -0700355 _leave(" = %d", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 return ret;
David Howellsec268152007-04-26 15:49:28 -0700357}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359/*
360 * get an AFS superblock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 */
Al Virof7442b32010-07-26 14:16:21 +0400362static struct dentry *afs_mount(struct file_system_type *fs_type,
363 int flags, const char *dev_name, void *options)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
365 struct afs_mount_params params;
366 struct super_block *sb;
David Howells08e0e7c2007-04-26 15:55:03 -0700367 struct afs_volume *vol;
David Howells00d3b7a2007-04-26 15:57:07 -0700368 struct key *key;
Miklos Szeredi969729d2008-02-08 04:21:37 -0800369 char *new_opts = kstrdup(options, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 int ret;
371
372 _enter(",,%s,%p", dev_name, options);
373
374 memset(&params, 0, sizeof(params));
375
David Howells00d3b7a2007-04-26 15:57:07 -0700376 /* parse the options and device name */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 if (options) {
David Howells00d3b7a2007-04-26 15:57:07 -0700378 ret = afs_parse_options(&params, options, &dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 if (ret < 0)
380 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 }
382
David Howells00d3b7a2007-04-26 15:57:07 -0700383 ret = afs_parse_device_name(&params, dev_name);
384 if (ret < 0)
385 goto error;
386
387 /* try and do the mount securely */
388 key = afs_request_key(params.cell);
389 if (IS_ERR(key)) {
390 _leave(" = %ld [key]", PTR_ERR(key));
391 ret = PTR_ERR(key);
392 goto error;
393 }
394 params.key = key;
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 /* parse the device name */
David Howells00d3b7a2007-04-26 15:57:07 -0700397 vol = afs_volume_lookup(&params);
David Howells08e0e7c2007-04-26 15:55:03 -0700398 if (IS_ERR(vol)) {
399 ret = PTR_ERR(vol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 goto error;
David Howells08e0e7c2007-04-26 15:55:03 -0700401 }
David Howells08e0e7c2007-04-26 15:55:03 -0700402 params.volume = vol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404 /* allocate a deviceless superblock */
405 sb = sget(fs_type, afs_test_super, set_anon_super, &params);
David Howells08e0e7c2007-04-26 15:55:03 -0700406 if (IS_ERR(sb)) {
407 ret = PTR_ERR(sb);
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");
414 sb->s_flags = flags;
415 ret = afs_fill_super(sb, &params);
416 if (ret < 0) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400417 deactivate_locked_super(sb);
David Howells436058a2007-04-26 15:56:24 -0700418 goto error;
419 }
Al Viro2a32ceb2009-05-08 16:05:57 -0400420 save_mount_options(sb, new_opts);
David Howells436058a2007-04-26 15:56:24 -0700421 sb->s_flags |= MS_ACTIVE;
422 } else {
423 _debug("reuse");
424 ASSERTCMP(sb->s_flags, &, MS_ACTIVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
427 afs_put_volume(params.volume);
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:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 afs_put_volume(params.volume);
David Howells00d3b7a2007-04-26 15:57:07 -0700435 afs_put_cell(params.cell);
436 key_put(params.key);
Miklos Szeredi969729d2008-02-08 04:21:37 -0800437 kfree(new_opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 _leave(" = %d", ret);
Al Virof7442b32010-07-26 14:16:21 +0400439 return ERR_PTR(ret);
David Howellsec268152007-04-26 15:49:28 -0700440}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442/*
443 * finish the unmounting process on the superblock
444 */
445static void afs_put_super(struct super_block *sb)
446{
447 struct afs_super_info *as = sb->s_fs_info;
448
449 _enter("");
450
451 afs_put_volume(as->volume);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
453 _leave("");
David Howellsec268152007-04-26 15:49:28 -0700454}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456/*
457 * initialise an inode cache slab element prior to any use
458 */
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700459static void afs_i_init_once(void *_vnode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460{
David Howellsec268152007-04-26 15:49:28 -0700461 struct afs_vnode *vnode = _vnode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
Christoph Lametera35afb82007-05-16 22:10:57 -0700463 memset(vnode, 0, sizeof(*vnode));
464 inode_init_once(&vnode->vfs_inode);
465 init_waitqueue_head(&vnode->update_waitq);
466 mutex_init(&vnode->permits_lock);
467 mutex_init(&vnode->validate_lock);
468 spin_lock_init(&vnode->writeback_lock);
469 spin_lock_init(&vnode->lock);
470 INIT_LIST_HEAD(&vnode->writebacks);
David Howellse8d6c552007-07-15 23:40:12 -0700471 INIT_LIST_HEAD(&vnode->pending_locks);
472 INIT_LIST_HEAD(&vnode->granted_locks);
473 INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
Christoph Lametera35afb82007-05-16 22:10:57 -0700474 INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
David Howellsec268152007-04-26 15:49:28 -0700475}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477/*
478 * allocate an AFS inode struct from our slab cache
479 */
480static struct inode *afs_alloc_inode(struct super_block *sb)
481{
482 struct afs_vnode *vnode;
483
David Howellsec268152007-04-26 15:49:28 -0700484 vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if (!vnode)
486 return NULL;
487
488 atomic_inc(&afs_count_active_inodes);
489
490 memset(&vnode->fid, 0, sizeof(vnode->fid));
491 memset(&vnode->status, 0, sizeof(vnode->status));
492
493 vnode->volume = NULL;
494 vnode->update_cnt = 0;
David Howells260a9802007-04-26 15:59:35 -0700495 vnode->flags = 1 << AFS_VNODE_UNSET;
David Howells08e0e7c2007-04-26 15:55:03 -0700496 vnode->cb_promised = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
David Howells0f300ca2007-05-10 22:22:20 -0700498 _leave(" = %p", &vnode->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 return &vnode->vfs_inode;
David Howellsec268152007-04-26 15:49:28 -0700500}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100502static void afs_i_callback(struct rcu_head *head)
503{
504 struct inode *inode = container_of(head, struct inode, i_rcu);
505 struct afs_vnode *vnode = AFS_FS_I(inode);
506 INIT_LIST_HEAD(&inode->i_dentry);
507 kmem_cache_free(afs_inode_cachep, vnode);
508}
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510/*
511 * destroy an AFS inode struct
512 */
513static void afs_destroy_inode(struct inode *inode)
514{
David Howells08e0e7c2007-04-26 15:55:03 -0700515 struct afs_vnode *vnode = AFS_FS_I(inode);
516
David Howells0f300ca2007-05-10 22:22:20 -0700517 _enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
David Howells08e0e7c2007-04-26 15:55:03 -0700519 _debug("DESTROY INODE %p", inode);
520
521 ASSERTCMP(vnode->server, ==, NULL);
522
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100523 call_rcu(&inode->i_rcu, afs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 atomic_dec(&afs_count_active_inodes);
David Howellsec268152007-04-26 15:49:28 -0700525}
David Howells45222b92007-05-10 22:22:20 -0700526
527/*
528 * return information about an AFS volume
529 */
530static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
531{
532 struct afs_volume_status vs;
533 struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
534 struct key *key;
535 int ret;
536
537 key = afs_request_key(vnode->volume->cell);
538 if (IS_ERR(key))
539 return PTR_ERR(key);
540
541 ret = afs_vnode_get_volume_status(vnode, key, &vs);
542 key_put(key);
543 if (ret < 0) {
544 _leave(" = %d", ret);
545 return ret;
546 }
547
548 buf->f_type = dentry->d_sb->s_magic;
549 buf->f_bsize = AFS_BLOCK_SIZE;
550 buf->f_namelen = AFSNAMEMAX - 1;
551
552 if (vs.max_quota == 0)
553 buf->f_blocks = vs.part_max_blocks;
554 else
555 buf->f_blocks = vs.max_quota;
556 buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
557 return 0;
558}