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10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/buffer_head.h>
13#include <linux/parser.h>
14#include <linux/mount.h>
15#include <linux/seq_file.h>
16#include <linux/slab.h>
17#include <linux/statfs.h>
18#include <linux/user_namespace.h>
19#include "adfs.h"
20#include "dir_f.h"
21#include "dir_fplus.h"
22
23#define ADFS_DEFAULT_OWNER_MASK S_IRWXU
24#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)
25
26void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...)
27{
28 char error_buf[128];
29 va_list args;
30
31 va_start(args, fmt);
32 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
33 va_end(args);
34
35 printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n",
36 sb->s_id, function ? ": " : "",
37 function ? function : "", error_buf);
38}
39
40static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
41{
42 int i;
43
44
45 if (dr->log2secsize != 8 &&
46 dr->log2secsize != 9 &&
47 dr->log2secsize != 10)
48 return 1;
49
50
51 if (dr->idlen < dr->log2secsize + 3)
52 return 1;
53
54
55
56
57
58 if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
59 return 1;
60
61
62 if (dr->idlen > 19)
63 return 1;
64
65
66 for (i = 0; i < sizeof(dr->unused52); i++)
67 if (dr->unused52[i] != 0)
68 return 1;
69
70 return 0;
71}
72
73static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map)
74{
75 unsigned int v0, v1, v2, v3;
76 int i;
77
78 v0 = v1 = v2 = v3 = 0;
79 for (i = sb->s_blocksize - 4; i; i -= 4) {
80 v0 += map[i] + (v3 >> 8);
81 v3 &= 0xff;
82 v1 += map[i + 1] + (v0 >> 8);
83 v0 &= 0xff;
84 v2 += map[i + 2] + (v1 >> 8);
85 v1 &= 0xff;
86 v3 += map[i + 3] + (v2 >> 8);
87 v2 &= 0xff;
88 }
89 v0 += v3 >> 8;
90 v1 += map[1] + (v0 >> 8);
91 v2 += map[2] + (v1 >> 8);
92 v3 += map[3] + (v2 >> 8);
93
94 return v0 ^ v1 ^ v2 ^ v3;
95}
96
97static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm)
98{
99 unsigned char crosscheck = 0, zonecheck = 1;
100 int i;
101
102 for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
103 unsigned char *map;
104
105 map = dm[i].dm_bh->b_data;
106
107 if (adfs_calczonecheck(sb, map) != map[0]) {
108 adfs_error(sb, "zone %d fails zonecheck", i);
109 zonecheck = 0;
110 }
111 crosscheck ^= map[3];
112 }
113 if (crosscheck != 0xff)
114 adfs_error(sb, "crosscheck != 0xff");
115 return crosscheck == 0xff && zonecheck;
116}
117
118static void adfs_put_super(struct super_block *sb)
119{
120 int i;
121 struct adfs_sb_info *asb = ADFS_SB(sb);
122
123 for (i = 0; i < asb->s_map_size; i++)
124 brelse(asb->s_map[i].dm_bh);
125 kfree(asb->s_map);
126 kfree_rcu(asb, rcu);
127}
128
129static int adfs_show_options(struct seq_file *seq, struct dentry *root)
130{
131 struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
132
133 if (!uid_eq(asb->s_uid, GLOBAL_ROOT_UID))
134 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, asb->s_uid));
135 if (!gid_eq(asb->s_gid, GLOBAL_ROOT_GID))
136 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, asb->s_gid));
137 if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
138 seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
139 if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
140 seq_printf(seq, ",othmask=%o", asb->s_other_mask);
141 if (asb->s_ftsuffix != 0)
142 seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
143
144 return 0;
145}
146
147enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
148
149static const match_table_t tokens = {
150 {Opt_uid, "uid=%u"},
151 {Opt_gid, "gid=%u"},
152 {Opt_ownmask, "ownmask=%o"},
153 {Opt_othmask, "othmask=%o"},
154 {Opt_ftsuffix, "ftsuffix=%u"},
155 {Opt_err, NULL}
156};
157
158static int parse_options(struct super_block *sb, char *options)
159{
160 char *p;
161 struct adfs_sb_info *asb = ADFS_SB(sb);
162 int option;
163
164 if (!options)
165 return 0;
166
167 while ((p = strsep(&options, ",")) != NULL) {
168 substring_t args[MAX_OPT_ARGS];
169 int token;
170 if (!*p)
171 continue;
172
173 token = match_token(p, tokens, args);
174 switch (token) {
175 case Opt_uid:
176 if (match_int(args, &option))
177 return -EINVAL;
178 asb->s_uid = make_kuid(current_user_ns(), option);
179 if (!uid_valid(asb->s_uid))
180 return -EINVAL;
181 break;
182 case Opt_gid:
183 if (match_int(args, &option))
184 return -EINVAL;
185 asb->s_gid = make_kgid(current_user_ns(), option);
186 if (!gid_valid(asb->s_gid))
187 return -EINVAL;
188 break;
189 case Opt_ownmask:
190 if (match_octal(args, &option))
191 return -EINVAL;
192 asb->s_owner_mask = option;
193 break;
194 case Opt_othmask:
195 if (match_octal(args, &option))
196 return -EINVAL;
197 asb->s_other_mask = option;
198 break;
199 case Opt_ftsuffix:
200 if (match_int(args, &option))
201 return -EINVAL;
202 asb->s_ftsuffix = option;
203 break;
204 default:
205 printk("ADFS-fs: unrecognised mount option \"%s\" "
206 "or missing value\n", p);
207 return -EINVAL;
208 }
209 }
210 return 0;
211}
212
213static int adfs_remount(struct super_block *sb, int *flags, char *data)
214{
215 *flags |= MS_NODIRATIME;
216 return parse_options(sb, data);
217}
218
219static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
220{
221 struct super_block *sb = dentry->d_sb;
222 struct adfs_sb_info *sbi = ADFS_SB(sb);
223 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
224
225 buf->f_type = ADFS_SUPER_MAGIC;
226 buf->f_namelen = sbi->s_namelen;
227 buf->f_bsize = sb->s_blocksize;
228 buf->f_blocks = sbi->s_size;
229 buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
230 buf->f_bavail =
231 buf->f_bfree = adfs_map_free(sb);
232 buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
233 buf->f_fsid.val[0] = (u32)id;
234 buf->f_fsid.val[1] = (u32)(id >> 32);
235
236 return 0;
237}
238
239static struct kmem_cache *adfs_inode_cachep;
240
241static struct inode *adfs_alloc_inode(struct super_block *sb)
242{
243 struct adfs_inode_info *ei;
244 ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
245 if (!ei)
246 return NULL;
247 return &ei->vfs_inode;
248}
249
250static void adfs_i_callback(struct rcu_head *head)
251{
252 struct inode *inode = container_of(head, struct inode, i_rcu);
253 kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
254}
255
256static void adfs_destroy_inode(struct inode *inode)
257{
258 call_rcu(&inode->i_rcu, adfs_i_callback);
259}
260
261static void init_once(void *foo)
262{
263 struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
264
265 inode_init_once(&ei->vfs_inode);
266}
267
268static int init_inodecache(void)
269{
270 adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
271 sizeof(struct adfs_inode_info),
272 0, (SLAB_RECLAIM_ACCOUNT|
273 SLAB_MEM_SPREAD),
274 init_once);
275 if (adfs_inode_cachep == NULL)
276 return -ENOMEM;
277 return 0;
278}
279
280static void destroy_inodecache(void)
281{
282
283
284
285
286 rcu_barrier();
287 kmem_cache_destroy(adfs_inode_cachep);
288}
289
290static const struct super_operations adfs_sops = {
291 .alloc_inode = adfs_alloc_inode,
292 .destroy_inode = adfs_destroy_inode,
293 .write_inode = adfs_write_inode,
294 .put_super = adfs_put_super,
295 .statfs = adfs_statfs,
296 .remount_fs = adfs_remount,
297 .show_options = adfs_show_options,
298};
299
300static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
301{
302 struct adfs_discmap *dm;
303 unsigned int map_addr, zone_size, nzones;
304 int i, zone;
305 struct adfs_sb_info *asb = ADFS_SB(sb);
306
307 nzones = asb->s_map_size;
308 zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
309 map_addr = (nzones >> 1) * zone_size -
310 ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
311 map_addr = signed_asl(map_addr, asb->s_map2blk);
312
313 asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
314
315 dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
316 if (dm == NULL) {
317 adfs_error(sb, "not enough memory");
318 return NULL;
319 }
320
321 for (zone = 0; zone < nzones; zone++, map_addr++) {
322 dm[zone].dm_startbit = 0;
323 dm[zone].dm_endbit = zone_size;
324 dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
325 dm[zone].dm_bh = sb_bread(sb, map_addr);
326
327 if (!dm[zone].dm_bh) {
328 adfs_error(sb, "unable to read map");
329 goto error_free;
330 }
331 }
332
333
334 i = zone - 1;
335 dm[0].dm_startblk = 0;
336 dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
337 dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
338 (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
339 (ADFS_DR_SIZE_BITS - i * zone_size);
340
341 if (adfs_checkmap(sb, dm))
342 return dm;
343
344 adfs_error(sb, "map corrupted");
345
346error_free:
347 while (--zone >= 0)
348 brelse(dm[zone].dm_bh);
349
350 kfree(dm);
351 return NULL;
352}
353
354static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
355{
356 unsigned long discsize;
357
358 discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
359 discsize |= le32_to_cpu(dr->disc_size) >> block_bits;
360
361 return discsize;
362}
363
364static int adfs_fill_super(struct super_block *sb, void *data, int silent)
365{
366 struct adfs_discrecord *dr;
367 struct buffer_head *bh;
368 struct object_info root_obj;
369 unsigned char *b_data;
370 struct adfs_sb_info *asb;
371 struct inode *root;
372
373 sb->s_flags |= MS_NODIRATIME;
374
375 asb = kzalloc(sizeof(*asb), GFP_KERNEL);
376 if (!asb)
377 return -ENOMEM;
378 sb->s_fs_info = asb;
379
380
381 asb->s_uid = GLOBAL_ROOT_UID;
382 asb->s_gid = GLOBAL_ROOT_GID;
383 asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
384 asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
385 asb->s_ftsuffix = 0;
386
387 if (parse_options(sb, data))
388 goto error;
389
390 sb_set_blocksize(sb, BLOCK_SIZE);
391 if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
392 adfs_error(sb, "unable to read superblock");
393 goto error;
394 }
395
396 b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
397
398 if (adfs_checkbblk(b_data)) {
399 if (!silent)
400 printk("VFS: Can't find an adfs filesystem on dev "
401 "%s.\n", sb->s_id);
402 goto error_free_bh;
403 }
404
405 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
406
407
408
409
410 if (adfs_checkdiscrecord(dr)) {
411 if (!silent)
412 printk("VPS: Can't find an adfs filesystem on dev "
413 "%s.\n", sb->s_id);
414 goto error_free_bh;
415 }
416
417 brelse(bh);
418 if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
419 bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
420 if (!bh) {
421 adfs_error(sb, "couldn't read superblock on "
422 "2nd try.");
423 goto error;
424 }
425 b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
426 if (adfs_checkbblk(b_data)) {
427 adfs_error(sb, "disc record mismatch, very weird!");
428 goto error_free_bh;
429 }
430 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
431 } else {
432 if (!silent)
433 printk(KERN_ERR "VFS: Unsupported blocksize on dev "
434 "%s.\n", sb->s_id);
435 goto error;
436 }
437
438
439
440
441
442 sb->s_magic = ADFS_SUPER_MAGIC;
443 asb->s_idlen = dr->idlen;
444 asb->s_map_size = dr->nzones | (dr->nzones_high << 8);
445 asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
446 asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
447 asb->s_version = dr->format_version;
448 asb->s_log2sharesize = dr->log2sharesize;
449
450 asb->s_map = adfs_read_map(sb, dr);
451 if (!asb->s_map)
452 goto error_free_bh;
453
454 brelse(bh);
455
456
457
458
459 sb->s_op = &adfs_sops;
460
461 dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
462
463 root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
464 root_obj.name_len = 0;
465
466 root_obj.loadaddr = 0xfff0003f;
467 root_obj.execaddr = 0xec22c000;
468 root_obj.size = ADFS_NEWDIR_SIZE;
469 root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
470 ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
471 root_obj.filetype = -1;
472
473
474
475
476
477 if (asb->s_version) {
478 root_obj.size = le32_to_cpu(dr->root_size);
479 asb->s_dir = &adfs_fplus_dir_ops;
480 asb->s_namelen = ADFS_FPLUS_NAME_LEN;
481 } else {
482 asb->s_dir = &adfs_f_dir_ops;
483 asb->s_namelen = ADFS_F_NAME_LEN;
484 }
485
486
487
488
489 if (asb->s_ftsuffix)
490 asb->s_namelen += 4;
491
492 sb->s_d_op = &adfs_dentry_operations;
493 root = adfs_iget(sb, &root_obj);
494 sb->s_root = d_make_root(root);
495 if (!sb->s_root) {
496 int i;
497 for (i = 0; i < asb->s_map_size; i++)
498 brelse(asb->s_map[i].dm_bh);
499 kfree(asb->s_map);
500 adfs_error(sb, "get root inode failed\n");
501 goto error;
502 }
503 return 0;
504
505error_free_bh:
506 brelse(bh);
507error:
508 sb->s_fs_info = NULL;
509 kfree(asb);
510 return -EINVAL;
511}
512
513static struct dentry *adfs_mount(struct file_system_type *fs_type,
514 int flags, const char *dev_name, void *data)
515{
516 return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
517}
518
519static struct file_system_type adfs_fs_type = {
520 .owner = THIS_MODULE,
521 .name = "adfs",
522 .mount = adfs_mount,
523 .kill_sb = kill_block_super,
524 .fs_flags = FS_REQUIRES_DEV,
525};
526MODULE_ALIAS_FS("adfs");
527
528static int __init init_adfs_fs(void)
529{
530 int err = init_inodecache();
531 if (err)
532 goto out1;
533 err = register_filesystem(&adfs_fs_type);
534 if (err)
535 goto out;
536 return 0;
537out:
538 destroy_inodecache();
539out1:
540 return err;
541}
542
543static void __exit exit_adfs_fs(void)
544{
545 unregister_filesystem(&adfs_fs_type);
546 destroy_inodecache();
547}
548
549module_init(init_adfs_fs)
550module_exit(exit_adfs_fs)
551MODULE_LICENSE("GPL");
552
