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13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/statfs.h>
16#include <linux/parser.h>
17#include <linux/magic.h>
18#include <linux/sched.h>
19#include <linux/slab.h>
20#include <linux/writeback.h>
21#include "affs.h"
22
23static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
24static int affs_remount (struct super_block *sb, int *flags, char *data);
25
26static void
27affs_commit_super(struct super_block *sb, int wait)
28{
29 struct affs_sb_info *sbi = AFFS_SB(sb);
30 struct buffer_head *bh = sbi->s_root_bh;
31 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
32
33 lock_buffer(bh);
34 secs_to_datestamp(get_seconds(), &tail->disk_change);
35 affs_fix_checksum(sb, bh);
36 unlock_buffer(bh);
37
38 mark_buffer_dirty(bh);
39 if (wait)
40 sync_dirty_buffer(bh);
41}
42
43static void
44affs_put_super(struct super_block *sb)
45{
46 struct affs_sb_info *sbi = AFFS_SB(sb);
47 pr_debug("%s()\n", __func__);
48
49 cancel_delayed_work_sync(&sbi->sb_work);
50}
51
52static int
53affs_sync_fs(struct super_block *sb, int wait)
54{
55 affs_commit_super(sb, wait);
56 return 0;
57}
58
59static void flush_superblock(struct work_struct *work)
60{
61 struct affs_sb_info *sbi;
62 struct super_block *sb;
63
64 sbi = container_of(work, struct affs_sb_info, sb_work.work);
65 sb = sbi->sb;
66
67 spin_lock(&sbi->work_lock);
68 sbi->work_queued = 0;
69 spin_unlock(&sbi->work_lock);
70
71 affs_commit_super(sb, 1);
72}
73
74void affs_mark_sb_dirty(struct super_block *sb)
75{
76 struct affs_sb_info *sbi = AFFS_SB(sb);
77 unsigned long delay;
78
79 if (sb->s_flags & MS_RDONLY)
80 return;
81
82 spin_lock(&sbi->work_lock);
83 if (!sbi->work_queued) {
84 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
85 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
86 sbi->work_queued = 1;
87 }
88 spin_unlock(&sbi->work_lock);
89}
90
91static struct kmem_cache * affs_inode_cachep;
92
93static struct inode *affs_alloc_inode(struct super_block *sb)
94{
95 struct affs_inode_info *i;
96
97 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
98 if (!i)
99 return NULL;
100
101 i->vfs_inode.i_version = 1;
102 i->i_lc = NULL;
103 i->i_ext_bh = NULL;
104 i->i_pa_cnt = 0;
105
106 return &i->vfs_inode;
107}
108
109static void affs_i_callback(struct rcu_head *head)
110{
111 struct inode *inode = container_of(head, struct inode, i_rcu);
112 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
113}
114
115static void affs_destroy_inode(struct inode *inode)
116{
117 call_rcu(&inode->i_rcu, affs_i_callback);
118}
119
120static void init_once(void *foo)
121{
122 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
123
124 sema_init(&ei->i_link_lock, 1);
125 sema_init(&ei->i_ext_lock, 1);
126 inode_init_once(&ei->vfs_inode);
127}
128
129static int __init init_inodecache(void)
130{
131 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
132 sizeof(struct affs_inode_info),
133 0, (SLAB_RECLAIM_ACCOUNT|
134 SLAB_MEM_SPREAD),
135 init_once);
136 if (affs_inode_cachep == NULL)
137 return -ENOMEM;
138 return 0;
139}
140
141static void destroy_inodecache(void)
142{
143
144
145
146
147 rcu_barrier();
148 kmem_cache_destroy(affs_inode_cachep);
149}
150
151static const struct super_operations affs_sops = {
152 .alloc_inode = affs_alloc_inode,
153 .destroy_inode = affs_destroy_inode,
154 .write_inode = affs_write_inode,
155 .evict_inode = affs_evict_inode,
156 .put_super = affs_put_super,
157 .sync_fs = affs_sync_fs,
158 .statfs = affs_statfs,
159 .remount_fs = affs_remount,
160 .show_options = generic_show_options,
161};
162
163enum {
164 Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
165 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
166 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
167};
168
169static const match_table_t tokens = {
170 {Opt_bs, "bs=%u"},
171 {Opt_mode, "mode=%o"},
172 {Opt_mufs, "mufs"},
173 {Opt_notruncate, "nofilenametruncate"},
174 {Opt_prefix, "prefix=%s"},
175 {Opt_protect, "protect"},
176 {Opt_reserved, "reserved=%u"},
177 {Opt_root, "root=%u"},
178 {Opt_setgid, "setgid=%u"},
179 {Opt_setuid, "setuid=%u"},
180 {Opt_verbose, "verbose"},
181 {Opt_volume, "volume=%s"},
182 {Opt_ignore, "grpquota"},
183 {Opt_ignore, "noquota"},
184 {Opt_ignore, "quota"},
185 {Opt_ignore, "usrquota"},
186 {Opt_err, NULL},
187};
188
189static int
190parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
191 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
192{
193 char *p;
194 substring_t args[MAX_OPT_ARGS];
195
196
197
198 *uid = current_uid();
199 *gid = current_gid();
200 *reserved = 2;
201 *root = -1;
202 *blocksize = -1;
203 volume[0] = ':';
204 volume[1] = 0;
205 *mount_opts = 0;
206 if (!options)
207 return 1;
208
209 while ((p = strsep(&options, ",")) != NULL) {
210 int token, n, option;
211 if (!*p)
212 continue;
213
214 token = match_token(p, tokens, args);
215 switch (token) {
216 case Opt_bs:
217 if (match_int(&args[0], &n))
218 return 0;
219 if (n != 512 && n != 1024 && n != 2048
220 && n != 4096) {
221 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
222 return 0;
223 }
224 *blocksize = n;
225 break;
226 case Opt_mode:
227 if (match_octal(&args[0], &option))
228 return 0;
229 *mode = option & 0777;
230 *mount_opts |= SF_SETMODE;
231 break;
232 case Opt_mufs:
233 *mount_opts |= SF_MUFS;
234 break;
235 case Opt_notruncate:
236 *mount_opts |= SF_NO_TRUNCATE;
237 break;
238 case Opt_prefix:
239 *prefix = match_strdup(&args[0]);
240 if (!*prefix)
241 return 0;
242 *mount_opts |= SF_PREFIX;
243 break;
244 case Opt_protect:
245 *mount_opts |= SF_IMMUTABLE;
246 break;
247 case Opt_reserved:
248 if (match_int(&args[0], reserved))
249 return 0;
250 break;
251 case Opt_root:
252 if (match_int(&args[0], root))
253 return 0;
254 break;
255 case Opt_setgid:
256 if (match_int(&args[0], &option))
257 return 0;
258 *gid = make_kgid(current_user_ns(), option);
259 if (!gid_valid(*gid))
260 return 0;
261 *mount_opts |= SF_SETGID;
262 break;
263 case Opt_setuid:
264 if (match_int(&args[0], &option))
265 return 0;
266 *uid = make_kuid(current_user_ns(), option);
267 if (!uid_valid(*uid))
268 return 0;
269 *mount_opts |= SF_SETUID;
270 break;
271 case Opt_verbose:
272 *mount_opts |= SF_VERBOSE;
273 break;
274 case Opt_volume: {
275 char *vol = match_strdup(&args[0]);
276 if (!vol)
277 return 0;
278 strlcpy(volume, vol, 32);
279 kfree(vol);
280 break;
281 }
282 case Opt_ignore:
283
284 break;
285 default:
286 pr_warn("Unrecognized mount option \"%s\" or missing value\n",
287 p);
288 return 0;
289 }
290 }
291 return 1;
292}
293
294
295
296
297
298static int affs_fill_super(struct super_block *sb, void *data, int silent)
299{
300 struct affs_sb_info *sbi;
301 struct buffer_head *root_bh = NULL;
302 struct buffer_head *boot_bh;
303 struct inode *root_inode = NULL;
304 s32 root_block;
305 int size, blocksize;
306 u32 chksum;
307 int num_bm;
308 int i, j;
309 kuid_t uid;
310 kgid_t gid;
311 int reserved;
312 unsigned long mount_flags;
313 int tmp_flags;
314 u8 sig[4];
315 int ret;
316
317 save_mount_options(sb, data);
318
319 pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
320
321 sb->s_magic = AFFS_SUPER_MAGIC;
322 sb->s_op = &affs_sops;
323 sb->s_flags |= MS_NODIRATIME;
324
325 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
326 if (!sbi)
327 return -ENOMEM;
328
329 sb->s_fs_info = sbi;
330 sbi->sb = sb;
331 mutex_init(&sbi->s_bmlock);
332 spin_lock_init(&sbi->symlink_lock);
333 spin_lock_init(&sbi->work_lock);
334 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
335
336 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
337 &blocksize,&sbi->s_prefix,
338 sbi->s_volume, &mount_flags)) {
339 pr_err("Error parsing options\n");
340 return -EINVAL;
341 }
342
343
344 sbi->s_flags = mount_flags;
345 sbi->s_mode = i;
346 sbi->s_uid = uid;
347 sbi->s_gid = gid;
348 sbi->s_reserved= reserved;
349
350
351
352
353
354
355 size = sb->s_bdev->bd_inode->i_size >> 9;
356 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
357
358 affs_set_blocksize(sb, PAGE_SIZE);
359
360
361 i = 512;
362 j = 4096;
363 if (blocksize > 0) {
364 i = j = blocksize;
365 size = size / (blocksize / 512);
366 }
367 for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
368 sbi->s_root_block = root_block;
369 if (root_block < 0)
370 sbi->s_root_block = (reserved + size - 1) / 2;
371 pr_debug("setting blocksize to %d\n", blocksize);
372 affs_set_blocksize(sb, blocksize);
373 sbi->s_partition_size = size;
374
375
376
377
378
379
380
381
382
383
384
385 for (num_bm = 0; num_bm < 2; num_bm++) {
386 pr_debug("Dev %s, trying root=%u, bs=%d, "
387 "size=%d, reserved=%d\n",
388 sb->s_id,
389 sbi->s_root_block + num_bm,
390 blocksize, size, reserved);
391 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
392 if (!root_bh)
393 continue;
394 if (!affs_checksum_block(sb, root_bh) &&
395 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
396 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
397 sbi->s_hashsize = blocksize / 4 - 56;
398 sbi->s_root_block += num_bm;
399 goto got_root;
400 }
401 affs_brelse(root_bh);
402 root_bh = NULL;
403 }
404 }
405 if (!silent)
406 pr_err("No valid root block on device %s\n", sb->s_id);
407 return -EINVAL;
408
409
410got_root:
411
412 sbi->s_root_bh = root_bh;
413 root_block = sbi->s_root_block;
414
415
416 boot_bh = sb_bread(sb, 0);
417 if (!boot_bh) {
418 pr_err("Cannot read boot block\n");
419 return -EINVAL;
420 }
421 memcpy(sig, boot_bh->b_data, 4);
422 brelse(boot_bh);
423 chksum = be32_to_cpu(*(__be32 *)sig);
424
425
426
427
428
429 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
430 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
431 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
432 sb->s_flags |= MS_RDONLY;
433 }
434 switch (chksum) {
435 case MUFS_FS:
436 case MUFS_INTLFFS:
437 case MUFS_DCFFS:
438 sbi->s_flags |= SF_MUFS;
439
440 case FS_INTLFFS:
441 case FS_DCFFS:
442 sbi->s_flags |= SF_INTL;
443 break;
444 case MUFS_FFS:
445 sbi->s_flags |= SF_MUFS;
446 break;
447 case FS_FFS:
448 break;
449 case MUFS_OFS:
450 sbi->s_flags |= SF_MUFS;
451
452 case FS_OFS:
453 sbi->s_flags |= SF_OFS;
454 sb->s_flags |= MS_NOEXEC;
455 break;
456 case MUFS_DCOFS:
457 case MUFS_INTLOFS:
458 sbi->s_flags |= SF_MUFS;
459 case FS_DCOFS:
460 case FS_INTLOFS:
461 sbi->s_flags |= SF_INTL | SF_OFS;
462 sb->s_flags |= MS_NOEXEC;
463 break;
464 default:
465 pr_err("Unknown filesystem on device %s: %08X\n",
466 sb->s_id, chksum);
467 return -EINVAL;
468 }
469
470 if (mount_flags & SF_VERBOSE) {
471 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
472 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
473 len > 31 ? 31 : len,
474 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
475 sig, sig[3] + '0', blocksize);
476 }
477
478 sb->s_flags |= MS_NODEV | MS_NOSUID;
479
480 sbi->s_data_blksize = sb->s_blocksize;
481 if (sbi->s_flags & SF_OFS)
482 sbi->s_data_blksize -= 24;
483
484 tmp_flags = sb->s_flags;
485 ret = affs_init_bitmap(sb, &tmp_flags);
486 if (ret)
487 return ret;
488 sb->s_flags = tmp_flags;
489
490
491
492 root_inode = affs_iget(sb, root_block);
493 if (IS_ERR(root_inode))
494 return PTR_ERR(root_inode);
495
496 if (AFFS_SB(sb)->s_flags & SF_INTL)
497 sb->s_d_op = &affs_intl_dentry_operations;
498 else
499 sb->s_d_op = &affs_dentry_operations;
500
501 sb->s_root = d_make_root(root_inode);
502 if (!sb->s_root) {
503 pr_err("AFFS: Get root inode failed\n");
504 return -ENOMEM;
505 }
506
507 pr_debug("s_flags=%lX\n", sb->s_flags);
508 return 0;
509}
510
511static int
512affs_remount(struct super_block *sb, int *flags, char *data)
513{
514 struct affs_sb_info *sbi = AFFS_SB(sb);
515 int blocksize;
516 kuid_t uid;
517 kgid_t gid;
518 int mode;
519 int reserved;
520 int root_block;
521 unsigned long mount_flags;
522 int res = 0;
523 char *new_opts = kstrdup(data, GFP_KERNEL);
524 char volume[32];
525 char *prefix = NULL;
526
527 pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
528
529 sync_filesystem(sb);
530 *flags |= MS_NODIRATIME;
531
532 memcpy(volume, sbi->s_volume, 32);
533 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
534 &blocksize, &prefix, volume,
535 &mount_flags)) {
536 kfree(prefix);
537 kfree(new_opts);
538 return -EINVAL;
539 }
540
541 flush_delayed_work(&sbi->sb_work);
542 replace_mount_options(sb, new_opts);
543
544 sbi->s_flags = mount_flags;
545 sbi->s_mode = mode;
546 sbi->s_uid = uid;
547 sbi->s_gid = gid;
548
549 spin_lock(&sbi->symlink_lock);
550 if (prefix) {
551 kfree(sbi->s_prefix);
552 sbi->s_prefix = prefix;
553 }
554 memcpy(sbi->s_volume, volume, 32);
555 spin_unlock(&sbi->symlink_lock);
556
557 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
558 return 0;
559
560 if (*flags & MS_RDONLY)
561 affs_free_bitmap(sb);
562 else
563 res = affs_init_bitmap(sb, flags);
564
565 return res;
566}
567
568static int
569affs_statfs(struct dentry *dentry, struct kstatfs *buf)
570{
571 struct super_block *sb = dentry->d_sb;
572 int free;
573 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
574
575 pr_debug("%s() partsize=%d, reserved=%d\n",
576 __func__, AFFS_SB(sb)->s_partition_size,
577 AFFS_SB(sb)->s_reserved);
578
579 free = affs_count_free_blocks(sb);
580 buf->f_type = AFFS_SUPER_MAGIC;
581 buf->f_bsize = sb->s_blocksize;
582 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
583 buf->f_bfree = free;
584 buf->f_bavail = free;
585 buf->f_fsid.val[0] = (u32)id;
586 buf->f_fsid.val[1] = (u32)(id >> 32);
587 buf->f_namelen = AFFSNAMEMAX;
588 return 0;
589}
590
591static struct dentry *affs_mount(struct file_system_type *fs_type,
592 int flags, const char *dev_name, void *data)
593{
594 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
595}
596
597static void affs_kill_sb(struct super_block *sb)
598{
599 struct affs_sb_info *sbi = AFFS_SB(sb);
600 kill_block_super(sb);
601 if (sbi) {
602 affs_free_bitmap(sb);
603 affs_brelse(sbi->s_root_bh);
604 kfree(sbi->s_prefix);
605 mutex_destroy(&sbi->s_bmlock);
606 kfree(sbi);
607 }
608}
609
610static struct file_system_type affs_fs_type = {
611 .owner = THIS_MODULE,
612 .name = "affs",
613 .mount = affs_mount,
614 .kill_sb = affs_kill_sb,
615 .fs_flags = FS_REQUIRES_DEV,
616};
617MODULE_ALIAS_FS("affs");
618
619static int __init init_affs_fs(void)
620{
621 int err = init_inodecache();
622 if (err)
623 goto out1;
624 err = register_filesystem(&affs_fs_type);
625 if (err)
626 goto out;
627 return 0;
628out:
629 destroy_inodecache();
630out1:
631 return err;
632}
633
634static void __exit exit_affs_fs(void)
635{
636 unregister_filesystem(&affs_fs_type);
637 destroy_inodecache();
638}
639
640MODULE_DESCRIPTION("Amiga filesystem support for Linux");
641MODULE_LICENSE("GPL");
642
643module_init(init_affs_fs)
644module_exit(exit_affs_fs)
645
