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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/cred.h>
20#include <linux/slab.h>
21#include <linux/writeback.h>
22#include <linux/blkdev.h>
23#include <linux/seq_file.h>
24#include <linux/iversion.h>
25#include "affs.h"
26
27static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
28static int affs_show_options(struct seq_file *m, struct dentry *root);
29static int affs_remount (struct super_block *sb, int *flags, char *data);
30
31static void
32affs_commit_super(struct super_block *sb, int wait)
33{
34 struct affs_sb_info *sbi = AFFS_SB(sb);
35 struct buffer_head *bh = sbi->s_root_bh;
36 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
37
38 lock_buffer(bh);
39 affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
40 affs_fix_checksum(sb, bh);
41 unlock_buffer(bh);
42
43 mark_buffer_dirty(bh);
44 if (wait)
45 sync_dirty_buffer(bh);
46}
47
48static void
49affs_put_super(struct super_block *sb)
50{
51 struct affs_sb_info *sbi = AFFS_SB(sb);
52 pr_debug("%s()\n", __func__);
53
54 cancel_delayed_work_sync(&sbi->sb_work);
55}
56
57static int
58affs_sync_fs(struct super_block *sb, int wait)
59{
60 affs_commit_super(sb, wait);
61 return 0;
62}
63
64static void flush_superblock(struct work_struct *work)
65{
66 struct affs_sb_info *sbi;
67 struct super_block *sb;
68
69 sbi = container_of(work, struct affs_sb_info, sb_work.work);
70 sb = sbi->sb;
71
72 spin_lock(&sbi->work_lock);
73 sbi->work_queued = 0;
74 spin_unlock(&sbi->work_lock);
75
76 affs_commit_super(sb, 1);
77}
78
79void affs_mark_sb_dirty(struct super_block *sb)
80{
81 struct affs_sb_info *sbi = AFFS_SB(sb);
82 unsigned long delay;
83
84 if (sb_rdonly(sb))
85 return;
86
87 spin_lock(&sbi->work_lock);
88 if (!sbi->work_queued) {
89 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
90 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
91 sbi->work_queued = 1;
92 }
93 spin_unlock(&sbi->work_lock);
94}
95
96static struct kmem_cache * affs_inode_cachep;
97
98static struct inode *affs_alloc_inode(struct super_block *sb)
99{
100 struct affs_inode_info *i;
101
102 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
103 if (!i)
104 return NULL;
105
106 inode_set_iversion(&i->vfs_inode, 1);
107 i->i_lc = NULL;
108 i->i_ext_bh = NULL;
109 i->i_pa_cnt = 0;
110
111 return &i->vfs_inode;
112}
113
114static void affs_i_callback(struct rcu_head *head)
115{
116 struct inode *inode = container_of(head, struct inode, i_rcu);
117 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
118}
119
120static void affs_destroy_inode(struct inode *inode)
121{
122 call_rcu(&inode->i_rcu, affs_i_callback);
123}
124
125static void init_once(void *foo)
126{
127 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
128
129 sema_init(&ei->i_link_lock, 1);
130 sema_init(&ei->i_ext_lock, 1);
131 inode_init_once(&ei->vfs_inode);
132}
133
134static int __init init_inodecache(void)
135{
136 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
137 sizeof(struct affs_inode_info),
138 0, (SLAB_RECLAIM_ACCOUNT|
139 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
140 init_once);
141 if (affs_inode_cachep == NULL)
142 return -ENOMEM;
143 return 0;
144}
145
146static void destroy_inodecache(void)
147{
148
149
150
151
152 rcu_barrier();
153 kmem_cache_destroy(affs_inode_cachep);
154}
155
156static const struct super_operations affs_sops = {
157 .alloc_inode = affs_alloc_inode,
158 .destroy_inode = affs_destroy_inode,
159 .write_inode = affs_write_inode,
160 .evict_inode = affs_evict_inode,
161 .put_super = affs_put_super,
162 .sync_fs = affs_sync_fs,
163 .statfs = affs_statfs,
164 .remount_fs = affs_remount,
165 .show_options = affs_show_options,
166};
167
168enum {
169 Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
170 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
171 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
172};
173
174static const match_table_t tokens = {
175 {Opt_bs, "bs=%u"},
176 {Opt_mode, "mode=%o"},
177 {Opt_mufs, "mufs"},
178 {Opt_notruncate, "nofilenametruncate"},
179 {Opt_prefix, "prefix=%s"},
180 {Opt_protect, "protect"},
181 {Opt_reserved, "reserved=%u"},
182 {Opt_root, "root=%u"},
183 {Opt_setgid, "setgid=%u"},
184 {Opt_setuid, "setuid=%u"},
185 {Opt_verbose, "verbose"},
186 {Opt_volume, "volume=%s"},
187 {Opt_ignore, "grpquota"},
188 {Opt_ignore, "noquota"},
189 {Opt_ignore, "quota"},
190 {Opt_ignore, "usrquota"},
191 {Opt_err, NULL},
192};
193
194static int
195parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
196 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
197{
198 char *p;
199 substring_t args[MAX_OPT_ARGS];
200
201
202
203 *uid = current_uid();
204 *gid = current_gid();
205 *reserved = 2;
206 *root = -1;
207 *blocksize = -1;
208 volume[0] = ':';
209 volume[1] = 0;
210 *mount_opts = 0;
211 if (!options)
212 return 1;
213
214 while ((p = strsep(&options, ",")) != NULL) {
215 int token, n, option;
216 if (!*p)
217 continue;
218
219 token = match_token(p, tokens, args);
220 switch (token) {
221 case Opt_bs:
222 if (match_int(&args[0], &n))
223 return 0;
224 if (n != 512 && n != 1024 && n != 2048
225 && n != 4096) {
226 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
227 return 0;
228 }
229 *blocksize = n;
230 break;
231 case Opt_mode:
232 if (match_octal(&args[0], &option))
233 return 0;
234 *mode = option & 0777;
235 affs_set_opt(*mount_opts, SF_SETMODE);
236 break;
237 case Opt_mufs:
238 affs_set_opt(*mount_opts, SF_MUFS);
239 break;
240 case Opt_notruncate:
241 affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
242 break;
243 case Opt_prefix:
244 *prefix = match_strdup(&args[0]);
245 if (!*prefix)
246 return 0;
247 affs_set_opt(*mount_opts, SF_PREFIX);
248 break;
249 case Opt_protect:
250 affs_set_opt(*mount_opts, SF_IMMUTABLE);
251 break;
252 case Opt_reserved:
253 if (match_int(&args[0], reserved))
254 return 0;
255 break;
256 case Opt_root:
257 if (match_int(&args[0], root))
258 return 0;
259 break;
260 case Opt_setgid:
261 if (match_int(&args[0], &option))
262 return 0;
263 *gid = make_kgid(current_user_ns(), option);
264 if (!gid_valid(*gid))
265 return 0;
266 affs_set_opt(*mount_opts, SF_SETGID);
267 break;
268 case Opt_setuid:
269 if (match_int(&args[0], &option))
270 return 0;
271 *uid = make_kuid(current_user_ns(), option);
272 if (!uid_valid(*uid))
273 return 0;
274 affs_set_opt(*mount_opts, SF_SETUID);
275 break;
276 case Opt_verbose:
277 affs_set_opt(*mount_opts, SF_VERBOSE);
278 break;
279 case Opt_volume: {
280 char *vol = match_strdup(&args[0]);
281 if (!vol)
282 return 0;
283 strlcpy(volume, vol, 32);
284 kfree(vol);
285 break;
286 }
287 case Opt_ignore:
288
289 break;
290 default:
291 pr_warn("Unrecognized mount option \"%s\" or missing value\n",
292 p);
293 return 0;
294 }
295 }
296 return 1;
297}
298
299static int affs_show_options(struct seq_file *m, struct dentry *root)
300{
301 struct super_block *sb = root->d_sb;
302 struct affs_sb_info *sbi = AFFS_SB(sb);
303
304 if (sb->s_blocksize)
305 seq_printf(m, ",bs=%lu", sb->s_blocksize);
306 if (affs_test_opt(sbi->s_flags, SF_SETMODE))
307 seq_printf(m, ",mode=%o", sbi->s_mode);
308 if (affs_test_opt(sbi->s_flags, SF_MUFS))
309 seq_puts(m, ",mufs");
310 if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
311 seq_puts(m, ",nofilenametruncate");
312 if (affs_test_opt(sbi->s_flags, SF_PREFIX))
313 seq_printf(m, ",prefix=%s", sbi->s_prefix);
314 if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
315 seq_puts(m, ",protect");
316 if (sbi->s_reserved != 2)
317 seq_printf(m, ",reserved=%u", sbi->s_reserved);
318 if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
319 seq_printf(m, ",root=%u", sbi->s_root_block);
320 if (affs_test_opt(sbi->s_flags, SF_SETGID))
321 seq_printf(m, ",setgid=%u",
322 from_kgid_munged(&init_user_ns, sbi->s_gid));
323 if (affs_test_opt(sbi->s_flags, SF_SETUID))
324 seq_printf(m, ",setuid=%u",
325 from_kuid_munged(&init_user_ns, sbi->s_uid));
326 if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
327 seq_puts(m, ",verbose");
328 if (sbi->s_volume[0])
329 seq_printf(m, ",volume=%s", sbi->s_volume);
330 return 0;
331}
332
333
334
335
336
337static int affs_fill_super(struct super_block *sb, void *data, int silent)
338{
339 struct affs_sb_info *sbi;
340 struct buffer_head *root_bh = NULL;
341 struct buffer_head *boot_bh;
342 struct inode *root_inode = NULL;
343 s32 root_block;
344 int size, blocksize;
345 u32 chksum;
346 int num_bm;
347 int i, j;
348 kuid_t uid;
349 kgid_t gid;
350 int reserved;
351 unsigned long mount_flags;
352 int tmp_flags;
353 u8 sig[4];
354 int ret;
355
356 pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
357
358 sb->s_magic = AFFS_SUPER_MAGIC;
359 sb->s_op = &affs_sops;
360 sb->s_flags |= SB_NODIRATIME;
361
362 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
363 if (!sbi)
364 return -ENOMEM;
365
366 sb->s_fs_info = sbi;
367 sbi->sb = sb;
368 mutex_init(&sbi->s_bmlock);
369 spin_lock_init(&sbi->symlink_lock);
370 spin_lock_init(&sbi->work_lock);
371 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
372
373 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
374 &blocksize,&sbi->s_prefix,
375 sbi->s_volume, &mount_flags)) {
376 pr_err("Error parsing options\n");
377 return -EINVAL;
378 }
379
380
381 sbi->s_flags = mount_flags;
382 sbi->s_mode = i;
383 sbi->s_uid = uid;
384 sbi->s_gid = gid;
385 sbi->s_reserved= reserved;
386
387
388
389
390
391
392 size = i_size_read(sb->s_bdev->bd_inode) >> 9;
393 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
394
395 affs_set_blocksize(sb, PAGE_SIZE);
396
397
398 i = bdev_logical_block_size(sb->s_bdev);
399 j = PAGE_SIZE;
400 if (blocksize > 0) {
401 i = j = blocksize;
402 size = size / (blocksize / 512);
403 }
404
405 for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
406 sbi->s_root_block = root_block;
407 if (root_block < 0)
408 sbi->s_root_block = (reserved + size - 1) / 2;
409 pr_debug("setting blocksize to %d\n", blocksize);
410 affs_set_blocksize(sb, blocksize);
411 sbi->s_partition_size = size;
412
413
414
415
416
417
418
419
420
421
422
423 for (num_bm = 0; num_bm < 2; num_bm++) {
424 pr_debug("Dev %s, trying root=%u, bs=%d, "
425 "size=%d, reserved=%d\n",
426 sb->s_id,
427 sbi->s_root_block + num_bm,
428 blocksize, size, reserved);
429 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
430 if (!root_bh)
431 continue;
432 if (!affs_checksum_block(sb, root_bh) &&
433 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
434 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
435 sbi->s_hashsize = blocksize / 4 - 56;
436 sbi->s_root_block += num_bm;
437 goto got_root;
438 }
439 affs_brelse(root_bh);
440 root_bh = NULL;
441 }
442 }
443 if (!silent)
444 pr_err("No valid root block on device %s\n", sb->s_id);
445 return -EINVAL;
446
447
448got_root:
449
450 sbi->s_root_bh = root_bh;
451 root_block = sbi->s_root_block;
452
453
454 boot_bh = sb_bread(sb, 0);
455 if (!boot_bh) {
456 pr_err("Cannot read boot block\n");
457 return -EINVAL;
458 }
459 memcpy(sig, boot_bh->b_data, 4);
460 brelse(boot_bh);
461 chksum = be32_to_cpu(*(__be32 *)sig);
462
463
464
465
466
467 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
468 || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
469 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
470 sb->s_flags |= SB_RDONLY;
471 }
472 switch (chksum) {
473 case MUFS_FS:
474 case MUFS_INTLFFS:
475 case MUFS_DCFFS:
476 affs_set_opt(sbi->s_flags, SF_MUFS);
477
478 case FS_INTLFFS:
479 case FS_DCFFS:
480 affs_set_opt(sbi->s_flags, SF_INTL);
481 break;
482 case MUFS_FFS:
483 affs_set_opt(sbi->s_flags, SF_MUFS);
484 break;
485 case FS_FFS:
486 break;
487 case MUFS_OFS:
488 affs_set_opt(sbi->s_flags, SF_MUFS);
489
490 case FS_OFS:
491 affs_set_opt(sbi->s_flags, SF_OFS);
492 sb->s_flags |= SB_NOEXEC;
493 break;
494 case MUFS_DCOFS:
495 case MUFS_INTLOFS:
496 affs_set_opt(sbi->s_flags, SF_MUFS);
497 case FS_DCOFS:
498 case FS_INTLOFS:
499 affs_set_opt(sbi->s_flags, SF_INTL);
500 affs_set_opt(sbi->s_flags, SF_OFS);
501 sb->s_flags |= SB_NOEXEC;
502 break;
503 default:
504 pr_err("Unknown filesystem on device %s: %08X\n",
505 sb->s_id, chksum);
506 return -EINVAL;
507 }
508
509 if (affs_test_opt(mount_flags, SF_VERBOSE)) {
510 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
511 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
512 len > 31 ? 31 : len,
513 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
514 sig, sig[3] + '0', blocksize);
515 }
516
517 sb->s_flags |= SB_NODEV | SB_NOSUID;
518
519 sbi->s_data_blksize = sb->s_blocksize;
520 if (affs_test_opt(sbi->s_flags, SF_OFS))
521 sbi->s_data_blksize -= 24;
522
523 tmp_flags = sb->s_flags;
524 ret = affs_init_bitmap(sb, &tmp_flags);
525 if (ret)
526 return ret;
527 sb->s_flags = tmp_flags;
528
529
530
531 root_inode = affs_iget(sb, root_block);
532 if (IS_ERR(root_inode))
533 return PTR_ERR(root_inode);
534
535 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
536 sb->s_d_op = &affs_intl_dentry_operations;
537 else
538 sb->s_d_op = &affs_dentry_operations;
539
540 sb->s_root = d_make_root(root_inode);
541 if (!sb->s_root) {
542 pr_err("AFFS: Get root inode failed\n");
543 return -ENOMEM;
544 }
545
546 sb->s_export_op = &affs_export_ops;
547 pr_debug("s_flags=%lX\n", sb->s_flags);
548 return 0;
549}
550
551static int
552affs_remount(struct super_block *sb, int *flags, char *data)
553{
554 struct affs_sb_info *sbi = AFFS_SB(sb);
555 int blocksize;
556 kuid_t uid;
557 kgid_t gid;
558 int mode;
559 int reserved;
560 int root_block;
561 unsigned long mount_flags;
562 int res = 0;
563 char *new_opts;
564 char volume[32];
565 char *prefix = NULL;
566
567 new_opts = kstrdup(data, GFP_KERNEL);
568 if (data && !new_opts)
569 return -ENOMEM;
570
571 pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
572
573 sync_filesystem(sb);
574 *flags |= SB_NODIRATIME;
575
576 memcpy(volume, sbi->s_volume, 32);
577 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
578 &blocksize, &prefix, volume,
579 &mount_flags)) {
580 kfree(prefix);
581 kfree(new_opts);
582 return -EINVAL;
583 }
584
585 flush_delayed_work(&sbi->sb_work);
586
587 sbi->s_flags = mount_flags;
588 sbi->s_mode = mode;
589 sbi->s_uid = uid;
590 sbi->s_gid = gid;
591
592 spin_lock(&sbi->symlink_lock);
593 if (prefix) {
594 kfree(sbi->s_prefix);
595 sbi->s_prefix = prefix;
596 }
597 memcpy(sbi->s_volume, volume, 32);
598 spin_unlock(&sbi->symlink_lock);
599
600 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
601 return 0;
602
603 if (*flags & SB_RDONLY)
604 affs_free_bitmap(sb);
605 else
606 res = affs_init_bitmap(sb, flags);
607
608 return res;
609}
610
611static int
612affs_statfs(struct dentry *dentry, struct kstatfs *buf)
613{
614 struct super_block *sb = dentry->d_sb;
615 int free;
616 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
617
618 pr_debug("%s() partsize=%d, reserved=%d\n",
619 __func__, AFFS_SB(sb)->s_partition_size,
620 AFFS_SB(sb)->s_reserved);
621
622 free = affs_count_free_blocks(sb);
623 buf->f_type = AFFS_SUPER_MAGIC;
624 buf->f_bsize = sb->s_blocksize;
625 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
626 buf->f_bfree = free;
627 buf->f_bavail = free;
628 buf->f_fsid.val[0] = (u32)id;
629 buf->f_fsid.val[1] = (u32)(id >> 32);
630 buf->f_namelen = AFFSNAMEMAX;
631 return 0;
632}
633
634static struct dentry *affs_mount(struct file_system_type *fs_type,
635 int flags, const char *dev_name, void *data)
636{
637 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
638}
639
640static void affs_kill_sb(struct super_block *sb)
641{
642 struct affs_sb_info *sbi = AFFS_SB(sb);
643 kill_block_super(sb);
644 if (sbi) {
645 affs_free_bitmap(sb);
646 affs_brelse(sbi->s_root_bh);
647 kfree(sbi->s_prefix);
648 mutex_destroy(&sbi->s_bmlock);
649 kfree(sbi);
650 }
651}
652
653static struct file_system_type affs_fs_type = {
654 .owner = THIS_MODULE,
655 .name = "affs",
656 .mount = affs_mount,
657 .kill_sb = affs_kill_sb,
658 .fs_flags = FS_REQUIRES_DEV,
659};
660MODULE_ALIAS_FS("affs");
661
662static int __init init_affs_fs(void)
663{
664 int err = init_inodecache();
665 if (err)
666 goto out1;
667 err = register_filesystem(&affs_fs_type);
668 if (err)
669 goto out;
670 return 0;
671out:
672 destroy_inodecache();
673out1:
674 return err;
675}
676
677static void __exit exit_affs_fs(void)
678{
679 unregister_filesystem(&affs_fs_type);
680 destroy_inodecache();
681}
682
683MODULE_DESCRIPTION("Amiga filesystem support for Linux");
684MODULE_LICENSE("GPL");
685
686module_init(init_affs_fs)
687module_exit(exit_affs_fs)
688
