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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 sync_filesystem(sb);
216 *flags |= SB_NODIRATIME;
217 return parse_options(sb, data);
218}
219
220static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
221{
222 struct super_block *sb = dentry->d_sb;
223 struct adfs_sb_info *sbi = ADFS_SB(sb);
224 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
225
226 buf->f_type = ADFS_SUPER_MAGIC;
227 buf->f_namelen = sbi->s_namelen;
228 buf->f_bsize = sb->s_blocksize;
229 buf->f_blocks = sbi->s_size;
230 buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
231 buf->f_bavail =
232 buf->f_bfree = adfs_map_free(sb);
233 buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
234 buf->f_fsid.val[0] = (u32)id;
235 buf->f_fsid.val[1] = (u32)(id >> 32);
236
237 return 0;
238}
239
240static struct kmem_cache *adfs_inode_cachep;
241
242static struct inode *adfs_alloc_inode(struct super_block *sb)
243{
244 struct adfs_inode_info *ei;
245 ei = kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
246 if (!ei)
247 return NULL;
248 return &ei->vfs_inode;
249}
250
251static void adfs_i_callback(struct rcu_head *head)
252{
253 struct inode *inode = container_of(head, struct inode, i_rcu);
254 kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
255}
256
257static void adfs_destroy_inode(struct inode *inode)
258{
259 call_rcu(&inode->i_rcu, adfs_i_callback);
260}
261
262static void init_once(void *foo)
263{
264 struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
265
266 inode_init_once(&ei->vfs_inode);
267}
268
269static int __init init_inodecache(void)
270{
271 adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
272 sizeof(struct adfs_inode_info),
273 0, (SLAB_RECLAIM_ACCOUNT|
274 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
275 init_once);
276 if (adfs_inode_cachep == NULL)
277 return -ENOMEM;
278 return 0;
279}
280
281static void destroy_inodecache(void)
282{
283
284
285
286
287 rcu_barrier();
288 kmem_cache_destroy(adfs_inode_cachep);
289}
290
291static const struct super_operations adfs_sops = {
292 .alloc_inode = adfs_alloc_inode,
293 .destroy_inode = adfs_destroy_inode,
294 .drop_inode = generic_delete_inode,
295 .write_inode = adfs_write_inode,
296 .put_super = adfs_put_super,
297 .statfs = adfs_statfs,
298 .remount_fs = adfs_remount,
299 .show_options = adfs_show_options,
300};
301
302static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
303{
304 struct adfs_discmap *dm;
305 unsigned int map_addr, zone_size, nzones;
306 int i, zone;
307 struct adfs_sb_info *asb = ADFS_SB(sb);
308
309 nzones = asb->s_map_size;
310 zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
311 map_addr = (nzones >> 1) * zone_size -
312 ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
313 map_addr = signed_asl(map_addr, asb->s_map2blk);
314
315 asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
316
317 dm = kmalloc_array(nzones, sizeof(*dm), GFP_KERNEL);
318 if (dm == NULL) {
319 adfs_error(sb, "not enough memory");
320 return ERR_PTR(-ENOMEM);
321 }
322
323 for (zone = 0; zone < nzones; zone++, map_addr++) {
324 dm[zone].dm_startbit = 0;
325 dm[zone].dm_endbit = zone_size;
326 dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
327 dm[zone].dm_bh = sb_bread(sb, map_addr);
328
329 if (!dm[zone].dm_bh) {
330 adfs_error(sb, "unable to read map");
331 goto error_free;
332 }
333 }
334
335
336 i = zone - 1;
337 dm[0].dm_startblk = 0;
338 dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
339 dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
340 (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
341 (ADFS_DR_SIZE_BITS - i * zone_size);
342
343 if (adfs_checkmap(sb, dm))
344 return dm;
345
346 adfs_error(sb, "map corrupted");
347
348error_free:
349 while (--zone >= 0)
350 brelse(dm[zone].dm_bh);
351
352 kfree(dm);
353 return ERR_PTR(-EIO);
354}
355
356static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
357{
358 unsigned long discsize;
359
360 discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
361 discsize |= le32_to_cpu(dr->disc_size) >> block_bits;
362
363 return discsize;
364}
365
366static int adfs_fill_super(struct super_block *sb, void *data, int silent)
367{
368 struct adfs_discrecord *dr;
369 struct buffer_head *bh;
370 struct object_info root_obj;
371 unsigned char *b_data;
372 struct adfs_sb_info *asb;
373 struct inode *root;
374 int ret = -EINVAL;
375
376 sb->s_flags |= SB_NODIRATIME;
377
378 asb = kzalloc(sizeof(*asb), GFP_KERNEL);
379 if (!asb)
380 return -ENOMEM;
381 sb->s_fs_info = asb;
382
383
384 asb->s_uid = GLOBAL_ROOT_UID;
385 asb->s_gid = GLOBAL_ROOT_GID;
386 asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
387 asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
388 asb->s_ftsuffix = 0;
389
390 if (parse_options(sb, data))
391 goto error;
392
393 sb_set_blocksize(sb, BLOCK_SIZE);
394 if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
395 adfs_error(sb, "unable to read superblock");
396 ret = -EIO;
397 goto error;
398 }
399
400 b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
401
402 if (adfs_checkbblk(b_data)) {
403 if (!silent)
404 printk("VFS: Can't find an adfs filesystem on dev "
405 "%s.\n", sb->s_id);
406 ret = -EINVAL;
407 goto error_free_bh;
408 }
409
410 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
411
412
413
414
415 if (adfs_checkdiscrecord(dr)) {
416 if (!silent)
417 printk("VPS: Can't find an adfs filesystem on dev "
418 "%s.\n", sb->s_id);
419 ret = -EINVAL;
420 goto error_free_bh;
421 }
422
423 brelse(bh);
424 if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
425 bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
426 if (!bh) {
427 adfs_error(sb, "couldn't read superblock on "
428 "2nd try.");
429 ret = -EIO;
430 goto error;
431 }
432 b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
433 if (adfs_checkbblk(b_data)) {
434 adfs_error(sb, "disc record mismatch, very weird!");
435 ret = -EINVAL;
436 goto error_free_bh;
437 }
438 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
439 } else {
440 if (!silent)
441 printk(KERN_ERR "VFS: Unsupported blocksize on dev "
442 "%s.\n", sb->s_id);
443 ret = -EINVAL;
444 goto error;
445 }
446
447
448
449
450
451 sb->s_magic = ADFS_SUPER_MAGIC;
452 asb->s_idlen = dr->idlen;
453 asb->s_map_size = dr->nzones | (dr->nzones_high << 8);
454 asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
455 asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
456 asb->s_version = dr->format_version;
457 asb->s_log2sharesize = dr->log2sharesize;
458
459 asb->s_map = adfs_read_map(sb, dr);
460 if (IS_ERR(asb->s_map)) {
461 ret = PTR_ERR(asb->s_map);
462 goto error_free_bh;
463 }
464
465 brelse(bh);
466
467
468
469
470 sb->s_op = &adfs_sops;
471
472 dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
473
474 root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
475 root_obj.name_len = 0;
476
477 root_obj.loadaddr = 0xfff0003f;
478 root_obj.execaddr = 0xec22c000;
479 root_obj.size = ADFS_NEWDIR_SIZE;
480 root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
481 ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
482 root_obj.filetype = -1;
483
484
485
486
487
488 if (asb->s_version) {
489 root_obj.size = le32_to_cpu(dr->root_size);
490 asb->s_dir = &adfs_fplus_dir_ops;
491 asb->s_namelen = ADFS_FPLUS_NAME_LEN;
492 } else {
493 asb->s_dir = &adfs_f_dir_ops;
494 asb->s_namelen = ADFS_F_NAME_LEN;
495 }
496
497
498
499
500 if (asb->s_ftsuffix)
501 asb->s_namelen += 4;
502
503 sb->s_d_op = &adfs_dentry_operations;
504 root = adfs_iget(sb, &root_obj);
505 sb->s_root = d_make_root(root);
506 if (!sb->s_root) {
507 int i;
508 for (i = 0; i < asb->s_map_size; i++)
509 brelse(asb->s_map[i].dm_bh);
510 kfree(asb->s_map);
511 adfs_error(sb, "get root inode failed\n");
512 ret = -EIO;
513 goto error;
514 }
515 return 0;
516
517error_free_bh:
518 brelse(bh);
519error:
520 sb->s_fs_info = NULL;
521 kfree(asb);
522 return ret;
523}
524
525static struct dentry *adfs_mount(struct file_system_type *fs_type,
526 int flags, const char *dev_name, void *data)
527{
528 return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
529}
530
531static struct file_system_type adfs_fs_type = {
532 .owner = THIS_MODULE,
533 .name = "adfs",
534 .mount = adfs_mount,
535 .kill_sb = kill_block_super,
536 .fs_flags = FS_REQUIRES_DEV,
537};
538MODULE_ALIAS_FS("adfs");
539
540static int __init init_adfs_fs(void)
541{
542 int err = init_inodecache();
543 if (err)
544 goto out1;
545 err = register_filesystem(&adfs_fs_type);
546 if (err)
547 goto out;
548 return 0;
549out:
550 destroy_inodecache();
551out1:
552 return err;
553}
554
555static void __exit exit_adfs_fs(void)
556{
557 unregister_filesystem(&adfs_fs_type);
558 destroy_inodecache();
559}
560
561module_init(init_adfs_fs)
562module_exit(exit_adfs_fs)
563MODULE_LICENSE("GPL");
564
