blob: fbdb022b75a27be11b5699203f8c04e32c499cf6 [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>
Eric W. Biedermanf74f70f2013-01-31 04:23:54 -080027#include <linux/nsproxy.h>
28#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include "internal.h"
30
31#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
32
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070033static void afs_i_init_once(void *foo);
Al Virof7442b32010-07-26 14:16:21 +040034static struct dentry *afs_mount(struct file_system_type *fs_type,
35 int flags, const char *dev_name, void *data);
Al Virodde194a2011-06-12 16:01:21 -040036static void afs_kill_super(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037static struct inode *afs_alloc_inode(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038static void afs_destroy_inode(struct inode *inode);
David Howells45222b92007-05-10 22:22:20 -070039static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -040041struct file_system_type afs_fs_type = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 .owner = THIS_MODULE,
43 .name = "afs",
Al Virof7442b32010-07-26 14:16:21 +040044 .mount = afs_mount,
Al Virodde194a2011-06-12 16:01:21 -040045 .kill_sb = afs_kill_super,
David Howells80c72fe2007-05-03 03:11:29 -070046 .fs_flags = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -070047};
Eric W. Biederman7f78e032013-03-02 19:39:14 -080048MODULE_ALIAS_FS("afs");
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080050static const struct super_operations afs_super_ops = {
David Howells45222b92007-05-10 22:22:20 -070051 .statfs = afs_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 .alloc_inode = afs_alloc_inode,
wangleibec5eb62010-08-11 09:38:04 +010053 .drop_inode = afs_drop_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 .destroy_inode = afs_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -040055 .evict_inode = afs_evict_inode,
Miklos Szeredi969729d2008-02-08 04:21:37 -080056 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -070057};
58
Christoph Lametere18b8902006-12-06 20:33:20 -080059static struct kmem_cache *afs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060static atomic_t afs_count_active_inodes;
61
David Howells80c72fe2007-05-03 03:11:29 -070062enum {
63 afs_no_opt,
64 afs_opt_cell,
65 afs_opt_rwpath,
66 afs_opt_vol,
wangleibec5eb62010-08-11 09:38:04 +010067 afs_opt_autocell,
David Howells80c72fe2007-05-03 03:11:29 -070068};
69
Steven Whitehousea447c092008-10-13 10:46:57 +010070static const match_table_t afs_options_list = {
David Howells80c72fe2007-05-03 03:11:29 -070071 { afs_opt_cell, "cell=%s" },
72 { afs_opt_rwpath, "rwpath" },
73 { afs_opt_vol, "vol=%s" },
wangleibec5eb62010-08-11 09:38:04 +010074 { afs_opt_autocell, "autocell" },
David Howells80c72fe2007-05-03 03:11:29 -070075 { afs_no_opt, NULL },
76};
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078/*
79 * initialise the filesystem
80 */
81int __init afs_fs_init(void)
82{
83 int ret;
84
85 _enter("");
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 /* create ourselves an inode cache */
88 atomic_set(&afs_count_active_inodes, 0);
89
90 ret = -ENOMEM;
91 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
92 sizeof(struct afs_vnode),
93 0,
Vladimir Davydov5d097052016-01-14 15:18:21 -080094 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
Paul Mundt20c2df82007-07-20 10:11:58 +090095 afs_i_init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 if (!afs_inode_cachep) {
97 printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
98 return ret;
99 }
100
101 /* now export our filesystem to lesser mortals */
102 ret = register_filesystem(&afs_fs_type);
103 if (ret < 0) {
104 kmem_cache_destroy(afs_inode_cachep);
David Howells08e0e7c2007-04-26 15:55:03 -0700105 _leave(" = %d", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 return ret;
107 }
108
David Howells08e0e7c2007-04-26 15:55:03 -0700109 _leave(" = 0");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 return 0;
David Howellsec268152007-04-26 15:49:28 -0700111}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113/*
114 * clean up the filesystem
115 */
116void __exit afs_fs_exit(void)
117{
David Howells08e0e7c2007-04-26 15:55:03 -0700118 _enter("");
119
120 afs_mntpt_kill_timer();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 unregister_filesystem(&afs_fs_type);
122
123 if (atomic_read(&afs_count_active_inodes) != 0) {
124 printk("kAFS: %d active inode objects still present\n",
125 atomic_read(&afs_count_active_inodes));
126 BUG();
127 }
128
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000129 /*
130 * Make sure all delayed rcu free inodes are flushed before we
131 * destroy cache.
132 */
133 rcu_barrier();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 kmem_cache_destroy(afs_inode_cachep);
David Howells08e0e7c2007-04-26 15:55:03 -0700135 _leave("");
David Howellsec268152007-04-26 15:49:28 -0700136}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 * parse the mount options
140 * - this function has been shamelessly adapted from the ext3 fs which
141 * shamelessly adapted it from the msdos fs
142 */
David Howells00d3b7a2007-04-26 15:57:07 -0700143static int afs_parse_options(struct afs_mount_params *params,
144 char *options, const char **devname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
David Howells08e0e7c2007-04-26 15:55:03 -0700146 struct afs_cell *cell;
David Howells80c72fe2007-05-03 03:11:29 -0700147 substring_t args[MAX_OPT_ARGS];
148 char *p;
149 int token;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 _enter("%s", options);
152
153 options[PAGE_SIZE - 1] = 0;
154
David Howells80c72fe2007-05-03 03:11:29 -0700155 while ((p = strsep(&options, ","))) {
156 if (!*p)
157 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
David Howells80c72fe2007-05-03 03:11:29 -0700159 token = match_token(p, afs_options_list, args);
160 switch (token) {
161 case afs_opt_cell:
162 cell = afs_cell_lookup(args[0].from,
wangleibec5eb62010-08-11 09:38:04 +0100163 args[0].to - args[0].from,
164 false);
David Howells08e0e7c2007-04-26 15:55:03 -0700165 if (IS_ERR(cell))
166 return PTR_ERR(cell);
David Howells00d3b7a2007-04-26 15:57:07 -0700167 afs_put_cell(params->cell);
168 params->cell = cell;
David Howells80c72fe2007-05-03 03:11:29 -0700169 break;
170
171 case afs_opt_rwpath:
172 params->rwpath = 1;
173 break;
174
175 case afs_opt_vol:
176 *devname = args[0].from;
177 break;
178
wangleibec5eb62010-08-11 09:38:04 +0100179 case afs_opt_autocell:
180 params->autocell = 1;
181 break;
182
David Howells80c72fe2007-05-03 03:11:29 -0700183 default:
184 printk(KERN_ERR "kAFS:"
185 " Unknown or invalid mount option: '%s'\n", p);
186 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 }
189
David Howells80c72fe2007-05-03 03:11:29 -0700190 _leave(" = 0");
191 return 0;
David Howellsec268152007-04-26 15:49:28 -0700192}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194/*
David Howells00d3b7a2007-04-26 15:57:07 -0700195 * parse a device name to get cell name, volume name, volume type and R/W
196 * selector
197 * - this can be one of the following:
198 * "%[cell:]volume[.]" R/W volume
199 * "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),
200 * or R/W (rwpath=1) volume
201 * "%[cell:]volume.readonly" R/O volume
202 * "#[cell:]volume.readonly" R/O volume
203 * "%[cell:]volume.backup" Backup volume
204 * "#[cell:]volume.backup" Backup volume
205 */
206static int afs_parse_device_name(struct afs_mount_params *params,
207 const char *name)
208{
209 struct afs_cell *cell;
210 const char *cellname, *suffix;
211 int cellnamesz;
212
213 _enter(",%s", name);
214
215 if (!name) {
216 printk(KERN_ERR "kAFS: no volume name specified\n");
217 return -EINVAL;
218 }
219
220 if ((name[0] != '%' && name[0] != '#') || !name[1]) {
221 printk(KERN_ERR "kAFS: unparsable volume name\n");
222 return -EINVAL;
223 }
224
225 /* determine the type of volume we're looking for */
226 params->type = AFSVL_ROVOL;
227 params->force = false;
228 if (params->rwpath || name[0] == '%') {
229 params->type = AFSVL_RWVOL;
230 params->force = true;
231 }
232 name++;
233
234 /* split the cell name out if there is one */
235 params->volname = strchr(name, ':');
236 if (params->volname) {
237 cellname = name;
238 cellnamesz = params->volname - name;
239 params->volname++;
240 } else {
241 params->volname = name;
242 cellname = NULL;
243 cellnamesz = 0;
244 }
245
246 /* the volume type is further affected by a possible suffix */
247 suffix = strrchr(params->volname, '.');
248 if (suffix) {
249 if (strcmp(suffix, ".readonly") == 0) {
250 params->type = AFSVL_ROVOL;
251 params->force = true;
252 } else if (strcmp(suffix, ".backup") == 0) {
253 params->type = AFSVL_BACKVOL;
254 params->force = true;
255 } else if (suffix[1] == 0) {
256 } else {
257 suffix = NULL;
258 }
259 }
260
261 params->volnamesz = suffix ?
262 suffix - params->volname : strlen(params->volname);
263
264 _debug("cell %*.*s [%p]",
265 cellnamesz, cellnamesz, cellname ?: "", params->cell);
266
267 /* lookup the cell record */
268 if (cellname || !params->cell) {
wangleibec5eb62010-08-11 09:38:04 +0100269 cell = afs_cell_lookup(cellname, cellnamesz, true);
David Howells00d3b7a2007-04-26 15:57:07 -0700270 if (IS_ERR(cell)) {
wangleibec5eb62010-08-11 09:38:04 +0100271 printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n",
272 cellnamesz, cellnamesz, cellname ?: "");
David Howells00d3b7a2007-04-26 15:57:07 -0700273 return PTR_ERR(cell);
274 }
275 afs_put_cell(params->cell);
276 params->cell = cell;
277 }
278
279 _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
280 params->cell->name, params->cell,
281 params->volnamesz, params->volnamesz, params->volname,
282 suffix ?: "-", params->type, params->force ? " FORCE" : "");
283
284 return 0;
285}
286
287/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 * check a superblock to see if it's the one we're looking for
289 */
290static int afs_test_super(struct super_block *sb, void *data)
291{
Al Virodde194a2011-06-12 16:01:21 -0400292 struct afs_super_info *as1 = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 struct afs_super_info *as = sb->s_fs_info;
294
Al Virodde194a2011-06-12 16:01:21 -0400295 return as->volume == as1->volume;
296}
297
298static int afs_set_super(struct super_block *sb, void *data)
299{
300 sb->s_fs_info = data;
301 return set_anon_super(sb, NULL);
David Howellsec268152007-04-26 15:49:28 -0700302}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304/*
305 * fill in the superblock
306 */
Al Virodde194a2011-06-12 16:01:21 -0400307static int afs_fill_super(struct super_block *sb,
308 struct afs_mount_params *params)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
Al Virodde194a2011-06-12 16:01:21 -0400310 struct afs_super_info *as = sb->s_fs_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 struct afs_fid fid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 struct inode *inode = NULL;
313 int ret;
314
David Howells08e0e7c2007-04-26 15:55:03 -0700315 _enter("");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 /* fill in the superblock */
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300318 sb->s_blocksize = PAGE_SIZE;
319 sb->s_blocksize_bits = PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 sb->s_magic = AFS_FS_MAGIC;
321 sb->s_op = &afs_super_ops;
Jens Axboee1da0222010-04-22 11:58:18 +0200322 sb->s_bdi = &as->volume->bdi;
David Howells2e41ae22011-06-14 00:38:44 +0100323 strlcpy(sb->s_id, as->volume->vlocation->vldb.name, sizeof(sb->s_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325 /* allocate the root inode and dentry */
326 fid.vid = as->volume->vid;
327 fid.vnode = 1;
328 fid.unique = 1;
David Howells260a9802007-04-26 15:59:35 -0700329 inode = afs_iget(sb, params->key, &fid, NULL, NULL);
David Howells08e0e7c2007-04-26 15:55:03 -0700330 if (IS_ERR(inode))
Al Virodde194a2011-06-12 16:01:21 -0400331 return PTR_ERR(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
wangleibec5eb62010-08-11 09:38:04 +0100333 if (params->autocell)
334 set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 ret = -ENOMEM;
Al Viro48fde702012-01-08 22:15:13 -0500337 sb->s_root = d_make_root(inode);
338 if (!sb->s_root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 goto error;
340
Al Virod61dcce2011-01-12 20:04:20 -0500341 sb->s_d_op = &afs_fs_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
David Howells08e0e7c2007-04-26 15:55:03 -0700343 _leave(" = 0");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 return 0;
345
David Howellsec268152007-04-26 15:49:28 -0700346error:
David Howells08e0e7c2007-04-26 15:55:03 -0700347 _leave(" = %d", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 return ret;
David Howellsec268152007-04-26 15:49:28 -0700349}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351/*
352 * get an AFS superblock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 */
Al Virof7442b32010-07-26 14:16:21 +0400354static struct dentry *afs_mount(struct file_system_type *fs_type,
355 int flags, const char *dev_name, void *options)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
357 struct afs_mount_params params;
358 struct super_block *sb;
David Howells08e0e7c2007-04-26 15:55:03 -0700359 struct afs_volume *vol;
David Howells00d3b7a2007-04-26 15:57:07 -0700360 struct key *key;
Miklos Szeredi969729d2008-02-08 04:21:37 -0800361 char *new_opts = kstrdup(options, GFP_KERNEL);
Al Virodde194a2011-06-12 16:01:21 -0400362 struct afs_super_info *as;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 int ret;
364
365 _enter(",,%s,%p", dev_name, options);
366
367 memset(&params, 0, sizeof(params));
368
Eric W. Biedermanf74f70f2013-01-31 04:23:54 -0800369 ret = -EINVAL;
370 if (current->nsproxy->net_ns != &init_net)
371 goto error;
372
David Howells00d3b7a2007-04-26 15:57:07 -0700373 /* parse the options and device name */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 if (options) {
David Howells00d3b7a2007-04-26 15:57:07 -0700375 ret = afs_parse_options(&params, options, &dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 if (ret < 0)
377 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 }
379
David Howells00d3b7a2007-04-26 15:57:07 -0700380 ret = afs_parse_device_name(&params, dev_name);
381 if (ret < 0)
382 goto error;
383
384 /* try and do the mount securely */
385 key = afs_request_key(params.cell);
386 if (IS_ERR(key)) {
387 _leave(" = %ld [key]", PTR_ERR(key));
388 ret = PTR_ERR(key);
389 goto error;
390 }
391 params.key = key;
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 /* parse the device name */
David Howells00d3b7a2007-04-26 15:57:07 -0700394 vol = afs_volume_lookup(&params);
David Howells08e0e7c2007-04-26 15:55:03 -0700395 if (IS_ERR(vol)) {
396 ret = PTR_ERR(vol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 goto error;
David Howells08e0e7c2007-04-26 15:55:03 -0700398 }
Al Virodde194a2011-06-12 16:01:21 -0400399
400 /* allocate a superblock info record */
401 as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
402 if (!as) {
403 ret = -ENOMEM;
404 afs_put_volume(vol);
405 goto error;
406 }
407 as->volume = vol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
409 /* allocate a deviceless superblock */
David Howells9249e172012-06-25 12:55:37 +0100410 sb = sget(fs_type, afs_test_super, afs_set_super, flags, as);
David Howells08e0e7c2007-04-26 15:55:03 -0700411 if (IS_ERR(sb)) {
412 ret = PTR_ERR(sb);
Al Virodde194a2011-06-12 16:01:21 -0400413 afs_put_volume(vol);
414 kfree(as);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 goto error;
David Howells08e0e7c2007-04-26 15:55:03 -0700416 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
David Howells436058a2007-04-26 15:56:24 -0700418 if (!sb->s_root) {
419 /* initial superblock/root creation */
420 _debug("create");
David Howells436058a2007-04-26 15:56:24 -0700421 ret = afs_fill_super(sb, &params);
422 if (ret < 0) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400423 deactivate_locked_super(sb);
David Howells436058a2007-04-26 15:56:24 -0700424 goto error;
425 }
Al Viro2a32ceb2009-05-08 16:05:57 -0400426 save_mount_options(sb, new_opts);
David Howells436058a2007-04-26 15:56:24 -0700427 sb->s_flags |= MS_ACTIVE;
428 } else {
429 _debug("reuse");
430 ASSERTCMP(sb->s_flags, &, MS_ACTIVE);
Al Virodde194a2011-06-12 16:01:21 -0400431 afs_put_volume(vol);
432 kfree(as);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
David Howells00d3b7a2007-04-26 15:57:07 -0700435 afs_put_cell(params.cell);
Al Viro2a32ceb2009-05-08 16:05:57 -0400436 kfree(new_opts);
David Howells08e0e7c2007-04-26 15:55:03 -0700437 _leave(" = 0 [%p]", sb);
Al Virof7442b32010-07-26 14:16:21 +0400438 return dget(sb->s_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
David Howellsec268152007-04-26 15:49:28 -0700440error:
David Howells00d3b7a2007-04-26 15:57:07 -0700441 afs_put_cell(params.cell);
442 key_put(params.key);
Miklos Szeredi969729d2008-02-08 04:21:37 -0800443 kfree(new_opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 _leave(" = %d", ret);
Al Virof7442b32010-07-26 14:16:21 +0400445 return ERR_PTR(ret);
David Howellsec268152007-04-26 15:49:28 -0700446}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Al Virodde194a2011-06-12 16:01:21 -0400448static void afs_kill_super(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449{
450 struct afs_super_info *as = sb->s_fs_info;
Al Virodde194a2011-06-12 16:01:21 -0400451 kill_anon_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 afs_put_volume(as->volume);
Al Virodde194a2011-06-12 16:01:21 -0400453 kfree(as);
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);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100506 kmem_cache_free(afs_inode_cachep, vnode);
507}
508
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509/*
510 * destroy an AFS inode struct
511 */
512static void afs_destroy_inode(struct inode *inode)
513{
David Howells08e0e7c2007-04-26 15:55:03 -0700514 struct afs_vnode *vnode = AFS_FS_I(inode);
515
David Howells0f300ca2007-05-10 22:22:20 -0700516 _enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
David Howells08e0e7c2007-04-26 15:55:03 -0700518 _debug("DESTROY INODE %p", inode);
519
520 ASSERTCMP(vnode->server, ==, NULL);
521
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100522 call_rcu(&inode->i_rcu, afs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 atomic_dec(&afs_count_active_inodes);
David Howellsec268152007-04-26 15:49:28 -0700524}
David Howells45222b92007-05-10 22:22:20 -0700525
526/*
527 * return information about an AFS volume
528 */
529static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
530{
531 struct afs_volume_status vs;
David Howells2b0143b2015-03-17 22:25:59 +0000532 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
David Howells45222b92007-05-10 22:22:20 -0700533 struct key *key;
534 int ret;
535
536 key = afs_request_key(vnode->volume->cell);
537 if (IS_ERR(key))
538 return PTR_ERR(key);
539
540 ret = afs_vnode_get_volume_status(vnode, key, &vs);
541 key_put(key);
542 if (ret < 0) {
543 _leave(" = %d", ret);
544 return ret;
545 }
546
547 buf->f_type = dentry->d_sb->s_magic;
548 buf->f_bsize = AFS_BLOCK_SIZE;
549 buf->f_namelen = AFSNAMEMAX - 1;
550
551 if (vs.max_quota == 0)
552 buf->f_blocks = vs.part_max_blocks;
553 else
554 buf->f_blocks = vs.max_quota;
555 buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
556 return 0;
557}