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14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/statfs.h>
17#include <linux/parser.h>
18#include <linux/magic.h>
19#include <linux/sched.h>
20#include <linux/cred.h>
21#include <linux/slab.h>
22#include <linux/writeback.h>
23#include <linux/blkdev.h>
24#include <linux/seq_file.h>
25#include <linux/iversion.h>
26#include "affs.h"
27
28static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
29static int affs_show_options(struct seq_file *m, struct dentry *root);
30static int affs_remount (struct super_block *sb, int *flags, char *data);
31
32static void
33affs_commit_super(struct super_block *sb, int wait)
34{
35 struct affs_sb_info *sbi = AFFS_SB(sb);
36 struct buffer_head *bh = sbi->s_root_bh;
37 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
38
39 lock_buffer(bh);
40 affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
41 affs_fix_checksum(sb, bh);
42 unlock_buffer(bh);
43
44 mark_buffer_dirty(bh);
45 if (wait)
46 sync_dirty_buffer(bh);
47}
48
49static void
50affs_put_super(struct super_block *sb)
51{
52 struct affs_sb_info *sbi = AFFS_SB(sb);
53 pr_debug("%s()\n", __func__);
54
55 cancel_delayed_work_sync(&sbi->sb_work);
56}
57
58static int
59affs_sync_fs(struct super_block *sb, int wait)
60{
61 affs_commit_super(sb, wait);
62 return 0;
63}
64
65static void flush_superblock(struct work_struct *work)
66{
67 struct affs_sb_info *sbi;
68 struct super_block *sb;
69
70 sbi = container_of(work, struct affs_sb_info, sb_work.work);
71 sb = sbi->sb;
72
73 spin_lock(&sbi->work_lock);
74 sbi->work_queued = 0;
75 spin_unlock(&sbi->work_lock);
76
77 affs_commit_super(sb, 1);
78}
79
80void affs_mark_sb_dirty(struct super_block *sb)
81{
82 struct affs_sb_info *sbi = AFFS_SB(sb);
83 unsigned long delay;
84
85 if (sb_rdonly(sb))
86 return;
87
88 spin_lock(&sbi->work_lock);
89 if (!sbi->work_queued) {
90 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
91 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
92 sbi->work_queued = 1;
93 }
94 spin_unlock(&sbi->work_lock);
95}
96
97static struct kmem_cache * affs_inode_cachep;
98
99static struct inode *affs_alloc_inode(struct super_block *sb)
100{
101 struct affs_inode_info *i;
102
103 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
104 if (!i)
105 return NULL;
106
107 inode_set_iversion(&i->vfs_inode, 1);
108 i->i_lc = NULL;
109 i->i_ext_bh = NULL;
110 i->i_pa_cnt = 0;
111
112 return &i->vfs_inode;
113}
114
115static void affs_free_inode(struct inode *inode)
116{
117 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
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|SLAB_ACCOUNT),
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 .free_inode = affs_free_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 = affs_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 affs_set_opt(*mount_opts, SF_SETMODE);
231 break;
232 case Opt_mufs:
233 affs_set_opt(*mount_opts, SF_MUFS);
234 break;
235 case Opt_notruncate:
236 affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
237 break;
238 case Opt_prefix:
239 kfree(*prefix);
240 *prefix = match_strdup(&args[0]);
241 if (!*prefix)
242 return 0;
243 affs_set_opt(*mount_opts, SF_PREFIX);
244 break;
245 case Opt_protect:
246 affs_set_opt(*mount_opts, SF_IMMUTABLE);
247 break;
248 case Opt_reserved:
249 if (match_int(&args[0], reserved))
250 return 0;
251 break;
252 case Opt_root:
253 if (match_int(&args[0], root))
254 return 0;
255 break;
256 case Opt_setgid:
257 if (match_int(&args[0], &option))
258 return 0;
259 *gid = make_kgid(current_user_ns(), option);
260 if (!gid_valid(*gid))
261 return 0;
262 affs_set_opt(*mount_opts, SF_SETGID);
263 break;
264 case Opt_setuid:
265 if (match_int(&args[0], &option))
266 return 0;
267 *uid = make_kuid(current_user_ns(), option);
268 if (!uid_valid(*uid))
269 return 0;
270 affs_set_opt(*mount_opts, SF_SETUID);
271 break;
272 case Opt_verbose:
273 affs_set_opt(*mount_opts, SF_VERBOSE);
274 break;
275 case Opt_volume: {
276 char *vol = match_strdup(&args[0]);
277 if (!vol)
278 return 0;
279 strlcpy(volume, vol, 32);
280 kfree(vol);
281 break;
282 }
283 case Opt_ignore:
284
285 break;
286 default:
287 pr_warn("Unrecognized mount option \"%s\" or missing value\n",
288 p);
289 return 0;
290 }
291 }
292 return 1;
293}
294
295static int affs_show_options(struct seq_file *m, struct dentry *root)
296{
297 struct super_block *sb = root->d_sb;
298 struct affs_sb_info *sbi = AFFS_SB(sb);
299
300 if (sb->s_blocksize)
301 seq_printf(m, ",bs=%lu", sb->s_blocksize);
302 if (affs_test_opt(sbi->s_flags, SF_SETMODE))
303 seq_printf(m, ",mode=%o", sbi->s_mode);
304 if (affs_test_opt(sbi->s_flags, SF_MUFS))
305 seq_puts(m, ",mufs");
306 if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
307 seq_puts(m, ",nofilenametruncate");
308 if (affs_test_opt(sbi->s_flags, SF_PREFIX))
309 seq_printf(m, ",prefix=%s", sbi->s_prefix);
310 if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
311 seq_puts(m, ",protect");
312 if (sbi->s_reserved != 2)
313 seq_printf(m, ",reserved=%u", sbi->s_reserved);
314 if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
315 seq_printf(m, ",root=%u", sbi->s_root_block);
316 if (affs_test_opt(sbi->s_flags, SF_SETGID))
317 seq_printf(m, ",setgid=%u",
318 from_kgid_munged(&init_user_ns, sbi->s_gid));
319 if (affs_test_opt(sbi->s_flags, SF_SETUID))
320 seq_printf(m, ",setuid=%u",
321 from_kuid_munged(&init_user_ns, sbi->s_uid));
322 if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
323 seq_puts(m, ",verbose");
324 if (sbi->s_volume[0])
325 seq_printf(m, ",volume=%s", sbi->s_volume);
326 return 0;
327}
328
329
330
331
332
333static int affs_fill_super(struct super_block *sb, void *data, int silent)
334{
335 struct affs_sb_info *sbi;
336 struct buffer_head *root_bh = NULL;
337 struct buffer_head *boot_bh;
338 struct inode *root_inode = NULL;
339 s32 root_block;
340 int size, blocksize;
341 u32 chksum;
342 int num_bm;
343 int i, j;
344 kuid_t uid;
345 kgid_t gid;
346 int reserved;
347 unsigned long mount_flags;
348 int tmp_flags;
349 u8 sig[4];
350 int ret;
351
352 pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
353
354 sb->s_magic = AFFS_SUPER_MAGIC;
355 sb->s_op = &affs_sops;
356 sb->s_flags |= SB_NODIRATIME;
357
358 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
359 if (!sbi)
360 return -ENOMEM;
361
362 sb->s_fs_info = sbi;
363 sbi->sb = sb;
364 mutex_init(&sbi->s_bmlock);
365 spin_lock_init(&sbi->symlink_lock);
366 spin_lock_init(&sbi->work_lock);
367 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
368
369 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
370 &blocksize,&sbi->s_prefix,
371 sbi->s_volume, &mount_flags)) {
372 pr_err("Error parsing options\n");
373 return -EINVAL;
374 }
375
376
377 sbi->s_flags = mount_flags;
378 sbi->s_mode = i;
379 sbi->s_uid = uid;
380 sbi->s_gid = gid;
381 sbi->s_reserved= reserved;
382
383
384
385
386
387
388 size = i_size_read(sb->s_bdev->bd_inode) >> 9;
389 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
390
391 affs_set_blocksize(sb, PAGE_SIZE);
392
393
394 i = bdev_logical_block_size(sb->s_bdev);
395 j = PAGE_SIZE;
396 if (blocksize > 0) {
397 i = j = blocksize;
398 size = size / (blocksize / 512);
399 }
400
401 for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
402 sbi->s_root_block = root_block;
403 if (root_block < 0)
404 sbi->s_root_block = (reserved + size - 1) / 2;
405 pr_debug("setting blocksize to %d\n", blocksize);
406 affs_set_blocksize(sb, blocksize);
407 sbi->s_partition_size = size;
408
409
410
411
412
413
414
415
416
417
418
419 for (num_bm = 0; num_bm < 2; num_bm++) {
420 pr_debug("Dev %s, trying root=%u, bs=%d, "
421 "size=%d, reserved=%d\n",
422 sb->s_id,
423 sbi->s_root_block + num_bm,
424 blocksize, size, reserved);
425 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
426 if (!root_bh)
427 continue;
428 if (!affs_checksum_block(sb, root_bh) &&
429 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
430 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
431 sbi->s_hashsize = blocksize / 4 - 56;
432 sbi->s_root_block += num_bm;
433 goto got_root;
434 }
435 affs_brelse(root_bh);
436 root_bh = NULL;
437 }
438 }
439 if (!silent)
440 pr_err("No valid root block on device %s\n", sb->s_id);
441 return -EINVAL;
442
443
444got_root:
445
446 sbi->s_root_bh = root_bh;
447 root_block = sbi->s_root_block;
448
449
450 boot_bh = sb_bread(sb, 0);
451 if (!boot_bh) {
452 pr_err("Cannot read boot block\n");
453 return -EINVAL;
454 }
455 memcpy(sig, boot_bh->b_data, 4);
456 brelse(boot_bh);
457 chksum = be32_to_cpu(*(__be32 *)sig);
458
459
460
461
462
463 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
464 || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
465 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
466 sb->s_flags |= SB_RDONLY;
467 }
468 switch (chksum) {
469 case MUFS_FS:
470 case MUFS_INTLFFS:
471 case MUFS_DCFFS:
472 affs_set_opt(sbi->s_flags, SF_MUFS);
473
474 case FS_INTLFFS:
475 case FS_DCFFS:
476 affs_set_opt(sbi->s_flags, SF_INTL);
477 break;
478 case MUFS_FFS:
479 affs_set_opt(sbi->s_flags, SF_MUFS);
480 break;
481 case FS_FFS:
482 break;
483 case MUFS_OFS:
484 affs_set_opt(sbi->s_flags, SF_MUFS);
485
486 case FS_OFS:
487 affs_set_opt(sbi->s_flags, SF_OFS);
488 sb->s_flags |= SB_NOEXEC;
489 break;
490 case MUFS_DCOFS:
491 case MUFS_INTLOFS:
492 affs_set_opt(sbi->s_flags, SF_MUFS);
493
494 case FS_DCOFS:
495 case FS_INTLOFS:
496 affs_set_opt(sbi->s_flags, SF_INTL);
497 affs_set_opt(sbi->s_flags, SF_OFS);
498 sb->s_flags |= SB_NOEXEC;
499 break;
500 default:
501 pr_err("Unknown filesystem on device %s: %08X\n",
502 sb->s_id, chksum);
503 return -EINVAL;
504 }
505
506 if (affs_test_opt(mount_flags, SF_VERBOSE)) {
507 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
508 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
509 len > 31 ? 31 : len,
510 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
511 sig, sig[3] + '0', blocksize);
512 }
513
514 sb->s_flags |= SB_NODEV | SB_NOSUID;
515
516 sbi->s_data_blksize = sb->s_blocksize;
517 if (affs_test_opt(sbi->s_flags, SF_OFS))
518 sbi->s_data_blksize -= 24;
519
520 tmp_flags = sb->s_flags;
521 ret = affs_init_bitmap(sb, &tmp_flags);
522 if (ret)
523 return ret;
524 sb->s_flags = tmp_flags;
525
526
527
528 root_inode = affs_iget(sb, root_block);
529 if (IS_ERR(root_inode))
530 return PTR_ERR(root_inode);
531
532 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
533 sb->s_d_op = &affs_intl_dentry_operations;
534 else
535 sb->s_d_op = &affs_dentry_operations;
536
537 sb->s_root = d_make_root(root_inode);
538 if (!sb->s_root) {
539 pr_err("AFFS: Get root inode failed\n");
540 return -ENOMEM;
541 }
542
543 sb->s_export_op = &affs_export_ops;
544 pr_debug("s_flags=%lX\n", sb->s_flags);
545 return 0;
546}
547
548static int
549affs_remount(struct super_block *sb, int *flags, char *data)
550{
551 struct affs_sb_info *sbi = AFFS_SB(sb);
552 int blocksize;
553 kuid_t uid;
554 kgid_t gid;
555 int mode;
556 int reserved;
557 int root_block;
558 unsigned long mount_flags;
559 int res = 0;
560 char *new_opts;
561 char volume[32];
562 char *prefix = NULL;
563
564 new_opts = kstrdup(data, GFP_KERNEL);
565 if (data && !new_opts)
566 return -ENOMEM;
567
568 pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
569
570 sync_filesystem(sb);
571 *flags |= SB_NODIRATIME;
572
573 memcpy(volume, sbi->s_volume, 32);
574 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
575 &blocksize, &prefix, volume,
576 &mount_flags)) {
577 kfree(prefix);
578 kfree(new_opts);
579 return -EINVAL;
580 }
581
582 flush_delayed_work(&sbi->sb_work);
583
584 sbi->s_flags = mount_flags;
585 sbi->s_mode = mode;
586 sbi->s_uid = uid;
587 sbi->s_gid = gid;
588
589 spin_lock(&sbi->symlink_lock);
590 if (prefix) {
591 kfree(sbi->s_prefix);
592 sbi->s_prefix = prefix;
593 }
594 memcpy(sbi->s_volume, volume, 32);
595 spin_unlock(&sbi->symlink_lock);
596
597 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
598 return 0;
599
600 if (*flags & SB_RDONLY)
601 affs_free_bitmap(sb);
602 else
603 res = affs_init_bitmap(sb, flags);
604
605 return res;
606}
607
608static int
609affs_statfs(struct dentry *dentry, struct kstatfs *buf)
610{
611 struct super_block *sb = dentry->d_sb;
612 int free;
613 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
614
615 pr_debug("%s() partsize=%d, reserved=%d\n",
616 __func__, AFFS_SB(sb)->s_partition_size,
617 AFFS_SB(sb)->s_reserved);
618
619 free = affs_count_free_blocks(sb);
620 buf->f_type = AFFS_SUPER_MAGIC;
621 buf->f_bsize = sb->s_blocksize;
622 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
623 buf->f_bfree = free;
624 buf->f_bavail = free;
625 buf->f_fsid.val[0] = (u32)id;
626 buf->f_fsid.val[1] = (u32)(id >> 32);
627 buf->f_namelen = AFFSNAMEMAX;
628 return 0;
629}
630
631static struct dentry *affs_mount(struct file_system_type *fs_type,
632 int flags, const char *dev_name, void *data)
633{
634 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
635}
636
637static void affs_kill_sb(struct super_block *sb)
638{
639 struct affs_sb_info *sbi = AFFS_SB(sb);
640 kill_block_super(sb);
641 if (sbi) {
642 affs_free_bitmap(sb);
643 affs_brelse(sbi->s_root_bh);
644 kfree(sbi->s_prefix);
645 mutex_destroy(&sbi->s_bmlock);
646 kfree(sbi);
647 }
648}
649
650static struct file_system_type affs_fs_type = {
651 .owner = THIS_MODULE,
652 .name = "affs",
653 .mount = affs_mount,
654 .kill_sb = affs_kill_sb,
655 .fs_flags = FS_REQUIRES_DEV,
656};
657MODULE_ALIAS_FS("affs");
658
659static int __init init_affs_fs(void)
660{
661 int err = init_inodecache();
662 if (err)
663 goto out1;
664 err = register_filesystem(&affs_fs_type);
665 if (err)
666 goto out;
667 return 0;
668out:
669 destroy_inodecache();
670out1:
671 return err;
672}
673
674static void __exit exit_affs_fs(void)
675{
676 unregister_filesystem(&affs_fs_type);
677 destroy_inodecache();
678}
679
680MODULE_DESCRIPTION("Amiga filesystem support for Linux");
681MODULE_LICENSE("GPL");
682
683module_init(init_affs_fs)
684module_exit(exit_affs_fs)
685
