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