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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/smp_lock.h>
18#include <linux/statfs.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 lock_kernel();
124
125 for (i = 0; i < asb->s_map_size; i++)
126 brelse(asb->s_map[i].dm_bh);
127 kfree(asb->s_map);
128 kfree(asb);
129 sb->s_fs_info = NULL;
130
131 unlock_kernel();
132}
133
134static int adfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
135{
136 struct adfs_sb_info *asb = ADFS_SB(mnt->mnt_sb);
137
138 if (asb->s_uid != 0)
139 seq_printf(seq, ",uid=%u", asb->s_uid);
140 if (asb->s_gid != 0)
141 seq_printf(seq, ",gid=%u", asb->s_gid);
142 if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
143 seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
144 if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
145 seq_printf(seq, ",othmask=%o", asb->s_other_mask);
146
147 return 0;
148}
149
150enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err};
151
152static const match_table_t tokens = {
153 {Opt_uid, "uid=%u"},
154 {Opt_gid, "gid=%u"},
155 {Opt_ownmask, "ownmask=%o"},
156 {Opt_othmask, "othmask=%o"},
157 {Opt_err, NULL}
158};
159
160static int parse_options(struct super_block *sb, char *options)
161{
162 char *p;
163 struct adfs_sb_info *asb = ADFS_SB(sb);
164 int option;
165
166 if (!options)
167 return 0;
168
169 while ((p = strsep(&options, ",")) != NULL) {
170 substring_t args[MAX_OPT_ARGS];
171 int token;
172 if (!*p)
173 continue;
174
175 token = match_token(p, tokens, args);
176 switch (token) {
177 case Opt_uid:
178 if (match_int(args, &option))
179 return -EINVAL;
180 asb->s_uid = option;
181 break;
182 case Opt_gid:
183 if (match_int(args, &option))
184 return -EINVAL;
185 asb->s_gid = option;
186 break;
187 case Opt_ownmask:
188 if (match_octal(args, &option))
189 return -EINVAL;
190 asb->s_owner_mask = option;
191 break;
192 case Opt_othmask:
193 if (match_octal(args, &option))
194 return -EINVAL;
195 asb->s_other_mask = option;
196 break;
197 default:
198 printk("ADFS-fs: unrecognised mount option \"%s\" "
199 "or missing value\n", p);
200 return -EINVAL;
201 }
202 }
203 return 0;
204}
205
206static int adfs_remount(struct super_block *sb, int *flags, char *data)
207{
208 *flags |= MS_NODIRATIME;
209 return parse_options(sb, data);
210}
211
212static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
213{
214 struct super_block *sb = dentry->d_sb;
215 struct adfs_sb_info *sbi = ADFS_SB(sb);
216 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
217
218 buf->f_type = ADFS_SUPER_MAGIC;
219 buf->f_namelen = sbi->s_namelen;
220 buf->f_bsize = sb->s_blocksize;
221 buf->f_blocks = sbi->s_size;
222 buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
223 buf->f_bavail =
224 buf->f_bfree = adfs_map_free(sb);
225 buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
226 buf->f_fsid.val[0] = (u32)id;
227 buf->f_fsid.val[1] = (u32)(id >> 32);
228
229 return 0;
230}
231
232static struct kmem_cache *adfs_inode_cachep;
233
234static struct inode *adfs_alloc_inode(struct super_block *sb)
235{
236 struct adfs_inode_info *ei;
237 ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
238 if (!ei)
239 return NULL;
240 return &ei->vfs_inode;
241}
242
243static void adfs_i_callback(struct rcu_head *head)
244{
245 struct inode *inode = container_of(head, struct inode, i_rcu);
246 INIT_LIST_HEAD(&inode->i_dentry);
247 kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
248}
249
250static void adfs_destroy_inode(struct inode *inode)
251{
252 call_rcu(&inode->i_rcu, adfs_i_callback);
253}
254
255static void init_once(void *foo)
256{
257 struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
258
259 inode_init_once(&ei->vfs_inode);
260}
261
262static int init_inodecache(void)
263{
264 adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
265 sizeof(struct adfs_inode_info),
266 0, (SLAB_RECLAIM_ACCOUNT|
267 SLAB_MEM_SPREAD),
268 init_once);
269 if (adfs_inode_cachep == NULL)
270 return -ENOMEM;
271 return 0;
272}
273
274static void destroy_inodecache(void)
275{
276 kmem_cache_destroy(adfs_inode_cachep);
277}
278
279static const struct super_operations adfs_sops = {
280 .alloc_inode = adfs_alloc_inode,
281 .destroy_inode = adfs_destroy_inode,
282 .write_inode = adfs_write_inode,
283 .put_super = adfs_put_super,
284 .statfs = adfs_statfs,
285 .remount_fs = adfs_remount,
286 .show_options = adfs_show_options,
287};
288
289static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
290{
291 struct adfs_discmap *dm;
292 unsigned int map_addr, zone_size, nzones;
293 int i, zone;
294 struct adfs_sb_info *asb = ADFS_SB(sb);
295
296 nzones = asb->s_map_size;
297 zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
298 map_addr = (nzones >> 1) * zone_size -
299 ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
300 map_addr = signed_asl(map_addr, asb->s_map2blk);
301
302 asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
303
304 dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
305 if (dm == NULL) {
306 adfs_error(sb, "not enough memory");
307 return NULL;
308 }
309
310 for (zone = 0; zone < nzones; zone++, map_addr++) {
311 dm[zone].dm_startbit = 0;
312 dm[zone].dm_endbit = zone_size;
313 dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
314 dm[zone].dm_bh = sb_bread(sb, map_addr);
315
316 if (!dm[zone].dm_bh) {
317 adfs_error(sb, "unable to read map");
318 goto error_free;
319 }
320 }
321
322
323 i = zone - 1;
324 dm[0].dm_startblk = 0;
325 dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
326 dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
327 (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
328 (ADFS_DR_SIZE_BITS - i * zone_size);
329
330 if (adfs_checkmap(sb, dm))
331 return dm;
332
333 adfs_error(sb, "map corrupted");
334
335error_free:
336 while (--zone >= 0)
337 brelse(dm[zone].dm_bh);
338
339 kfree(dm);
340 return NULL;
341}
342
343static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
344{
345 unsigned long discsize;
346
347 discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
348 discsize |= le32_to_cpu(dr->disc_size) >> block_bits;
349
350 return discsize;
351}
352
353static int adfs_fill_super(struct super_block *sb, void *data, int silent)
354{
355 struct adfs_discrecord *dr;
356 struct buffer_head *bh;
357 struct object_info root_obj;
358 unsigned char *b_data;
359 struct adfs_sb_info *asb;
360 struct inode *root;
361
362 lock_kernel();
363
364 sb->s_flags |= MS_NODIRATIME;
365
366 asb = kzalloc(sizeof(*asb), GFP_KERNEL);
367 if (!asb) {
368 unlock_kernel();
369 return -ENOMEM;
370 }
371 sb->s_fs_info = asb;
372
373
374 asb->s_uid = 0;
375 asb->s_gid = 0;
376 asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
377 asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
378
379 if (parse_options(sb, data))
380 goto error;
381
382 sb_set_blocksize(sb, BLOCK_SIZE);
383 if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
384 adfs_error(sb, "unable to read superblock");
385 goto error;
386 }
387
388 b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
389
390 if (adfs_checkbblk(b_data)) {
391 if (!silent)
392 printk("VFS: Can't find an adfs filesystem on dev "
393 "%s.\n", sb->s_id);
394 goto error_free_bh;
395 }
396
397 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
398
399
400
401
402 if (adfs_checkdiscrecord(dr)) {
403 if (!silent)
404 printk("VPS: Can't find an adfs filesystem on dev "
405 "%s.\n", sb->s_id);
406 goto error_free_bh;
407 }
408
409 brelse(bh);
410 if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
411 bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
412 if (!bh) {
413 adfs_error(sb, "couldn't read superblock on "
414 "2nd try.");
415 goto error;
416 }
417 b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
418 if (adfs_checkbblk(b_data)) {
419 adfs_error(sb, "disc record mismatch, very weird!");
420 goto error_free_bh;
421 }
422 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
423 } else {
424 if (!silent)
425 printk(KERN_ERR "VFS: Unsupported blocksize on dev "
426 "%s.\n", sb->s_id);
427 goto error;
428 }
429
430
431
432
433
434 sb->s_magic = ADFS_SUPER_MAGIC;
435 asb->s_idlen = dr->idlen;
436 asb->s_map_size = dr->nzones | (dr->nzones_high << 8);
437 asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
438 asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
439 asb->s_version = dr->format_version;
440 asb->s_log2sharesize = dr->log2sharesize;
441
442 asb->s_map = adfs_read_map(sb, dr);
443 if (!asb->s_map)
444 goto error_free_bh;
445
446 brelse(bh);
447
448
449
450
451 sb->s_op = &adfs_sops;
452
453 dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
454
455 root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
456 root_obj.name_len = 0;
457 root_obj.loadaddr = 0;
458 root_obj.execaddr = 0;
459 root_obj.size = ADFS_NEWDIR_SIZE;
460 root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
461 ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
462
463
464
465
466
467 if (asb->s_version) {
468 root_obj.size = le32_to_cpu(dr->root_size);
469 asb->s_dir = &adfs_fplus_dir_ops;
470 asb->s_namelen = ADFS_FPLUS_NAME_LEN;
471 } else {
472 asb->s_dir = &adfs_f_dir_ops;
473 asb->s_namelen = ADFS_F_NAME_LEN;
474 }
475
476 sb->s_d_op = &adfs_dentry_operations;
477 root = adfs_iget(sb, &root_obj);
478 sb->s_root = d_alloc_root(root);
479 if (!sb->s_root) {
480 int i;
481 iput(root);
482 for (i = 0; i < asb->s_map_size; i++)
483 brelse(asb->s_map[i].dm_bh);
484 kfree(asb->s_map);
485 adfs_error(sb, "get root inode failed\n");
486 goto error;
487 }
488 unlock_kernel();
489 return 0;
490
491error_free_bh:
492 brelse(bh);
493error:
494 sb->s_fs_info = NULL;
495 kfree(asb);
496 unlock_kernel();
497 return -EINVAL;
498}
499
500static struct dentry *adfs_mount(struct file_system_type *fs_type,
501 int flags, const char *dev_name, void *data)
502{
503 return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
504}
505
506static struct file_system_type adfs_fs_type = {
507 .owner = THIS_MODULE,
508 .name = "adfs",
509 .mount = adfs_mount,
510 .kill_sb = kill_block_super,
511 .fs_flags = FS_REQUIRES_DEV,
512};
513
514static int __init init_adfs_fs(void)
515{
516 int err = init_inodecache();
517 if (err)
518 goto out1;
519 err = register_filesystem(&adfs_fs_type);
520 if (err)
521 goto out;
522 return 0;
523out:
524 destroy_inodecache();
525out1:
526 return err;
527}
528
529static void __exit exit_adfs_fs(void)
530{
531 unregister_filesystem(&adfs_fs_type);
532 destroy_inodecache();
533}
534
535module_init(init_adfs_fs)
536module_exit(exit_adfs_fs)
537MODULE_LICENSE("GPL");
538
