super.c (bc95f3669f5e6f63cf0b84fe4922c3c6dd4aa775) super.c (80c72fe415698049a477314ac82790c1af0fa7e3)
1/* AFS superblock handling
2 *
3 * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
4 *
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

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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>
1/* AFS superblock handling
2 *
3 * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
4 *
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

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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>
23#include <linux/parser.h>
23#include "internal.h"
24
25#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
26
27static void afs_i_init_once(void *foo, struct kmem_cache *cachep,
28 unsigned long flags);
29
30static int afs_get_sb(struct file_system_type *fs_type,

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37
38static void afs_destroy_inode(struct inode *inode);
39
40struct file_system_type afs_fs_type = {
41 .owner = THIS_MODULE,
42 .name = "afs",
43 .get_sb = afs_get_sb,
44 .kill_sb = kill_anon_super,
24#include "internal.h"
25
26#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
27
28static void afs_i_init_once(void *foo, struct kmem_cache *cachep,
29 unsigned long flags);
30
31static int afs_get_sb(struct file_system_type *fs_type,

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38
39static void afs_destroy_inode(struct inode *inode);
40
41struct file_system_type afs_fs_type = {
42 .owner = THIS_MODULE,
43 .name = "afs",
44 .get_sb = afs_get_sb,
45 .kill_sb = kill_anon_super,
45 .fs_flags = FS_BINARY_MOUNTDATA,
46 .fs_flags = 0,
46};
47
48static const struct super_operations afs_super_ops = {
49 .statfs = simple_statfs,
50 .alloc_inode = afs_alloc_inode,
51 .drop_inode = generic_delete_inode,
52 .destroy_inode = afs_destroy_inode,
53 .clear_inode = afs_clear_inode,
54 .umount_begin = afs_umount_begin,
55 .put_super = afs_put_super,
56};
57
58static struct kmem_cache *afs_inode_cachep;
59static atomic_t afs_count_active_inodes;
60
47};
48
49static const struct super_operations afs_super_ops = {
50 .statfs = simple_statfs,
51 .alloc_inode = afs_alloc_inode,
52 .drop_inode = generic_delete_inode,
53 .destroy_inode = afs_destroy_inode,
54 .clear_inode = afs_clear_inode,
55 .umount_begin = afs_umount_begin,
56 .put_super = afs_put_super,
57};
58
59static struct kmem_cache *afs_inode_cachep;
60static atomic_t afs_count_active_inodes;
61
62enum {
63 afs_no_opt,
64 afs_opt_cell,
65 afs_opt_rwpath,
66 afs_opt_vol,
67};
68
69static const match_table_t afs_options_list = {
70 { afs_opt_cell, "cell=%s" },
71 { afs_opt_rwpath, "rwpath" },
72 { afs_opt_vol, "vol=%s" },
73 { afs_no_opt, NULL },
74};
75
61/*
62 * initialise the filesystem
63 */
64int __init afs_fs_init(void)
65{
66 int ret;
67
68 _enter("");

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110 BUG();
111 }
112
113 kmem_cache_destroy(afs_inode_cachep);
114 _leave("");
115}
116
117/*
76/*
77 * initialise the filesystem
78 */
79int __init afs_fs_init(void)
80{
81 int ret;
82
83 _enter("");

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125 BUG();
126 }
127
128 kmem_cache_destroy(afs_inode_cachep);
129 _leave("");
130}
131
132/*
118 * check that an argument has a value
119 */
120static int want_arg(char **_value, const char *option)
121{
122 if (!_value || !*_value || !**_value) {
123 printk(KERN_NOTICE "kAFS: %s: argument missing\n", option);
124 return 0;
125 }
126 return 1;
127}
128
129/*
130 * check that there's no subsequent value
131 */
132static int want_no_value(char *const *_value, const char *option)
133{
134 if (*_value && **_value) {
135 printk(KERN_NOTICE "kAFS: %s: Invalid argument: %s\n",
136 option, *_value);
137 return 0;
138 }
139 return 1;
140}
141
142/*
143 * parse the mount options
144 * - this function has been shamelessly adapted from the ext3 fs which
145 * shamelessly adapted it from the msdos fs
146 */
147static int afs_parse_options(struct afs_mount_params *params,
148 char *options, const char **devname)
149{
150 struct afs_cell *cell;
133 * parse the mount options
134 * - this function has been shamelessly adapted from the ext3 fs which
135 * shamelessly adapted it from the msdos fs
136 */
137static int afs_parse_options(struct afs_mount_params *params,
138 char *options, const char **devname)
139{
140 struct afs_cell *cell;
151 char *key, *value;
152 int ret;
141 substring_t args[MAX_OPT_ARGS];
142 char *p;
143 int token;
153
154 _enter("%s", options);
155
156 options[PAGE_SIZE - 1] = 0;
157
144
145 _enter("%s", options);
146
147 options[PAGE_SIZE - 1] = 0;
148
158 ret = 0;
159 while ((key = strsep(&options, ","))) {
160 value = strchr(key, '=');
161 if (value)
162 *value++ = 0;
149 while ((p = strsep(&options, ","))) {
150 if (!*p)
151 continue;
163
152
164 _debug("kAFS: KEY: %s, VAL:%s", key, value ?: "-");
165
166 if (strcmp(key, "rwpath") == 0) {
167 if (!want_no_value(&value, "rwpath"))
168 return -EINVAL;
169 params->rwpath = 1;
170 } else if (strcmp(key, "vol") == 0) {
171 if (!want_arg(&value, "vol"))
172 return -EINVAL;
173 *devname = value;
174 } else if (strcmp(key, "cell") == 0) {
175 if (!want_arg(&value, "cell"))
176 return -EINVAL;
177 cell = afs_cell_lookup(value, strlen(value));
153 token = match_token(p, afs_options_list, args);
154 switch (token) {
155 case afs_opt_cell:
156 cell = afs_cell_lookup(args[0].from,
157 args[0].to - args[0].from);
178 if (IS_ERR(cell))
179 return PTR_ERR(cell);
180 afs_put_cell(params->cell);
181 params->cell = cell;
158 if (IS_ERR(cell))
159 return PTR_ERR(cell);
160 afs_put_cell(params->cell);
161 params->cell = cell;
182 } else {
183 printk("kAFS: Unknown mount option: '%s'\n", key);
184 ret = -EINVAL;
185 goto error;
162 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
172 default:
173 printk(KERN_ERR "kAFS:"
174 " Unknown or invalid mount option: '%s'\n", p);
175 return -EINVAL;
186 }
187 }
188
176 }
177 }
178
189 ret = 0;
190error:
191 _leave(" = %d", ret);
192 return ret;
179 _leave(" = 0");
180 return 0;
193}
194
195/*
196 * parse a device name to get cell name, volume name, volume type and R/W
197 * selector
198 * - this can be one of the following:
199 * "%[cell:]volume[.]" R/W volume
200 * "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),

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356 sb->s_fs_info = NULL;
357
358 _leave(" = %d", ret);
359 return ret;
360}
361
362/*
363 * get an AFS superblock
181}
182
183/*
184 * parse a device name to get cell name, volume name, volume type and R/W
185 * selector
186 * - this can be one of the following:
187 * "%[cell:]volume[.]" R/W volume
188 * "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),

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344 sb->s_fs_info = NULL;
345
346 _leave(" = %d", ret);
347 return ret;
348}
349
350/*
351 * get an AFS superblock
364 * - TODO: don't use get_sb_nodev(), but rather call sget() directly
365 */
366static int afs_get_sb(struct file_system_type *fs_type,
367 int flags,
368 const char *dev_name,
369 void *options,
370 struct vfsmount *mnt)
371{
372 struct afs_mount_params params;

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381
382 /* parse the options and device name */
383 if (options) {
384 ret = afs_parse_options(&params, options, &dev_name);
385 if (ret < 0)
386 goto error;
387 }
388
352 */
353static int afs_get_sb(struct file_system_type *fs_type,
354 int flags,
355 const char *dev_name,
356 void *options,
357 struct vfsmount *mnt)
358{
359 struct afs_mount_params params;

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368
369 /* parse the options and device name */
370 if (options) {
371 ret = afs_parse_options(&params, options, &dev_name);
372 if (ret < 0)
373 goto error;
374 }
375
389
390 ret = afs_parse_device_name(&params, dev_name);
391 if (ret < 0)
392 goto error;
393
394 /* try and do the mount securely */
395 key = afs_request_key(params.cell);
396 if (IS_ERR(key)) {
397 _leave(" = %ld [key]", PTR_ERR(key));

--- 124 unchanged lines hidden --- 		376 ret = afs_parse_device_name(&params, dev_name);
377 if (ret < 0)
378 goto error;
379
380 /* try and do the mount securely */
381 key = afs_request_key(params.cell);
382 if (IS_ERR(key)) {
383 _leave(" = %ld [key]", PTR_ERR(key));

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