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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(asb);
127 sb->s_fs_info = NULL;
128}
129
130static int adfs_show_options(struct seq_file *seq, struct dentry *root)
131{
132 struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
133
134 if (!uid_eq(asb->s_uid, GLOBAL_ROOT_UID))
135 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, asb->s_uid));
136 if (!gid_eq(asb->s_gid, GLOBAL_ROOT_GID))
137 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, asb->s_gid));
138 if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
139 seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
140 if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
141 seq_printf(seq, ",othmask=%o", asb->s_other_mask);
142 if (asb->s_ftsuffix != 0)
143 seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
144
145 return 0;
146}
147
148enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
149
150static const match_table_t tokens = {
151 {Opt_uid, "uid=%u"},
152 {Opt_gid, "gid=%u"},
153 {Opt_ownmask, "ownmask=%o"},
154 {Opt_othmask, "othmask=%o"},
155 {Opt_ftsuffix, "ftsuffix=%u"},
156 {Opt_err, NULL}
157};
158
159static int parse_options(struct super_block *sb, char *options)
160{
161 char *p;
162 struct adfs_sb_info *asb = ADFS_SB(sb);
163 int option;
164
165 if (!options)
166 return 0;
167
168 while ((p = strsep(&options, ",")) != NULL) {
169 substring_t args[MAX_OPT_ARGS];
170 int token;
171 if (!*p)
172 continue;
173
174 token = match_token(p, tokens, args);
175 switch (token) {
176 case Opt_uid:
177 if (match_int(args, &option))
178 return -EINVAL;
179 asb->s_uid = make_kuid(current_user_ns(), option);
180 if (!uid_valid(asb->s_uid))
181 return -EINVAL;
182 break;
183 case Opt_gid:
184 if (match_int(args, &option))
185 return -EINVAL;
186 asb->s_gid = make_kgid(current_user_ns(), option);
187 if (!gid_valid(asb->s_gid))
188 return -EINVAL;
189 break;
190 case Opt_ownmask:
191 if (match_octal(args, &option))
192 return -EINVAL;
193 asb->s_owner_mask = option;
194 break;
195 case Opt_othmask:
196 if (match_octal(args, &option))
197 return -EINVAL;
198 asb->s_other_mask = option;
199 break;
200 case Opt_ftsuffix:
201 if (match_int(args, &option))
202 return -EINVAL;
203 asb->s_ftsuffix = option;
204 break;
205 default:
206 printk("ADFS-fs: unrecognised mount option \"%s\" "
207 "or missing value\n", p);
208 return -EINVAL;
209 }
210 }
211 return 0;
212}
213
214static int adfs_remount(struct super_block *sb, int *flags, char *data)
215{
216 *flags |= MS_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 = (struct adfs_inode_info *)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_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),
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 .write_inode = adfs_write_inode,
295 .put_super = adfs_put_super,
296 .statfs = adfs_statfs,
297 .remount_fs = adfs_remount,
298 .show_options = adfs_show_options,
299};
300
301static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
302{
303 struct adfs_discmap *dm;
304 unsigned int map_addr, zone_size, nzones;
305 int i, zone;
306 struct adfs_sb_info *asb = ADFS_SB(sb);
307
308 nzones = asb->s_map_size;
309 zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
310 map_addr = (nzones >> 1) * zone_size -
311 ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
312 map_addr = signed_asl(map_addr, asb->s_map2blk);
313
314 asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
315
316 dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
317 if (dm == NULL) {
318 adfs_error(sb, "not enough memory");
319 return NULL;
320 }
321
322 for (zone = 0; zone < nzones; zone++, map_addr++) {
323 dm[zone].dm_startbit = 0;
324 dm[zone].dm_endbit = zone_size;
325 dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
326 dm[zone].dm_bh = sb_bread(sb, map_addr);
327
328 if (!dm[zone].dm_bh) {
329 adfs_error(sb, "unable to read map");
330 goto error_free;
331 }
332 }
333
334
335 i = zone - 1;
336 dm[0].dm_startblk = 0;
337 dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
338 dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
339 (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
340 (ADFS_DR_SIZE_BITS - i * zone_size);
341
342 if (adfs_checkmap(sb, dm))
343 return dm;
344
345 adfs_error(sb, "map corrupted");
346
347error_free:
348 while (--zone >= 0)
349 brelse(dm[zone].dm_bh);
350
351 kfree(dm);
352 return NULL;
353}
354
355static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
356{
357 unsigned long discsize;
358
359 discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
360 discsize |= le32_to_cpu(dr->disc_size) >> block_bits;
361
362 return discsize;
363}
364
365static int adfs_fill_super(struct super_block *sb, void *data, int silent)
366{
367 struct adfs_discrecord *dr;
368 struct buffer_head *bh;
369 struct object_info root_obj;
370 unsigned char *b_data;
371 struct adfs_sb_info *asb;
372 struct inode *root;
373
374 sb->s_flags |= MS_NODIRATIME;
375
376 asb = kzalloc(sizeof(*asb), GFP_KERNEL);
377 if (!asb)
378 return -ENOMEM;
379 sb->s_fs_info = asb;
380
381
382 asb->s_uid = GLOBAL_ROOT_UID;
383 asb->s_gid = GLOBAL_ROOT_GID;
384 asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
385 asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
386 asb->s_ftsuffix = 0;
387
388 if (parse_options(sb, data))
389 goto error;
390
391 sb_set_blocksize(sb, BLOCK_SIZE);
392 if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
393 adfs_error(sb, "unable to read superblock");
394 goto error;
395 }
396
397 b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
398
399 if (adfs_checkbblk(b_data)) {
400 if (!silent)
401 printk("VFS: Can't find an adfs filesystem on dev "
402 "%s.\n", sb->s_id);
403 goto error_free_bh;
404 }
405
406 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
407
408
409
410
411 if (adfs_checkdiscrecord(dr)) {
412 if (!silent)
413 printk("VPS: Can't find an adfs filesystem on dev "
414 "%s.\n", sb->s_id);
415 goto error_free_bh;
416 }
417
418 brelse(bh);
419 if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
420 bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
421 if (!bh) {
422 adfs_error(sb, "couldn't read superblock on "
423 "2nd try.");
424 goto error;
425 }
426 b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
427 if (adfs_checkbblk(b_data)) {
428 adfs_error(sb, "disc record mismatch, very weird!");
429 goto error_free_bh;
430 }
431 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
432 } else {
433 if (!silent)
434 printk(KERN_ERR "VFS: Unsupported blocksize on dev "
435 "%s.\n", sb->s_id);
436 goto error;
437 }
438
439
440
441
442
443 sb->s_magic = ADFS_SUPER_MAGIC;
444 asb->s_idlen = dr->idlen;
445 asb->s_map_size = dr->nzones | (dr->nzones_high << 8);
446 asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
447 asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
448 asb->s_version = dr->format_version;
449 asb->s_log2sharesize = dr->log2sharesize;
450
451 asb->s_map = adfs_read_map(sb, dr);
452 if (!asb->s_map)
453 goto error_free_bh;
454
455 brelse(bh);
456
457
458
459
460 sb->s_op = &adfs_sops;
461
462 dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
463
464 root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
465 root_obj.name_len = 0;
466
467 root_obj.loadaddr = 0xfff0003f;
468 root_obj.execaddr = 0xec22c000;
469 root_obj.size = ADFS_NEWDIR_SIZE;
470 root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
471 ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
472 root_obj.filetype = -1;
473
474
475
476
477
478 if (asb->s_version) {
479 root_obj.size = le32_to_cpu(dr->root_size);
480 asb->s_dir = &adfs_fplus_dir_ops;
481 asb->s_namelen = ADFS_FPLUS_NAME_LEN;
482 } else {
483 asb->s_dir = &adfs_f_dir_ops;
484 asb->s_namelen = ADFS_F_NAME_LEN;
485 }
486
487
488
489
490 if (asb->s_ftsuffix)
491 asb->s_namelen += 4;
492
493 sb->s_d_op = &adfs_dentry_operations;
494 root = adfs_iget(sb, &root_obj);
495 sb->s_root = d_make_root(root);
496 if (!sb->s_root) {
497 int i;
498 for (i = 0; i < asb->s_map_size; i++)
499 brelse(asb->s_map[i].dm_bh);
500 kfree(asb->s_map);
501 adfs_error(sb, "get root inode failed\n");
502 goto error;
503 }
504 return 0;
505
506error_free_bh:
507 brelse(bh);
508error:
509 sb->s_fs_info = NULL;
510 kfree(asb);
511 return -EINVAL;
512}
513
514static struct dentry *adfs_mount(struct file_system_type *fs_type,
515 int flags, const char *dev_name, void *data)
516{
517 return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
518}
519
520static struct file_system_type adfs_fs_type = {
521 .owner = THIS_MODULE,
522 .name = "adfs",
523 .mount = adfs_mount,
524 .kill_sb = kill_block_super,
525 .fs_flags = FS_REQUIRES_DEV,
526};
527MODULE_ALIAS_FS("adfs");
528
529static int __init init_adfs_fs(void)
530{
531 int err = init_inodecache();
532 if (err)
533 goto out1;
534 err = register_filesystem(&adfs_fs_type);
535 if (err)
536 goto out;
537 return 0;
538out:
539 destroy_inodecache();
540out1:
541 return err;
542}
543
544static void __exit exit_adfs_fs(void)
545{
546 unregister_filesystem(&adfs_fs_type);
547 destroy_inodecache();
548}
549
550module_init(init_adfs_fs)
551module_exit(exit_adfs_fs)
552MODULE_LICENSE("GPL");
553
