1 /*
2 * linux/fs/affs/inode.c
3 *
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
5 *
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
7 *
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
9 *
10 * (C) 1991 Linus Torvalds - minix filesystem
11 */
12
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 "affs.h"
20
21 extern struct timezone sys_tz;
22
23 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
24 static int affs_remount (struct super_block *sb, int *flags, char *data);
25
26 static void
27 affs_put_super(struct super_block *sb)
28 {
29 struct affs_sb_info *sbi = AFFS_SB(sb);
30 pr_debug("AFFS: put_super()\n");
31
32 if (!(sb->s_flags & MS_RDONLY)) {
33 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
34 secs_to_datestamp(get_seconds(),
35 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
36 affs_fix_checksum(sb, sbi->s_root_bh);
37 mark_buffer_dirty(sbi->s_root_bh);
38 }
39
40 kfree(sbi->s_prefix);
41 affs_free_bitmap(sb);
42 affs_brelse(sbi->s_root_bh);
43 kfree(sbi);
44 sb->s_fs_info = NULL;
45 return;
46 }
47
48 static void
49 affs_write_super(struct super_block *sb)
50 {
51 int clean = 2;
52 struct affs_sb_info *sbi = AFFS_SB(sb);
53
54 if (!(sb->s_flags & MS_RDONLY)) {
55 // if (sbi->s_bitmap[i].bm_bh) {
56 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
57 // clean = 0;
58 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
59 secs_to_datestamp(get_seconds(),
60 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
61 affs_fix_checksum(sb, sbi->s_root_bh);
62 mark_buffer_dirty(sbi->s_root_bh);
63 sb->s_dirt = !clean; /* redo until bitmap synced */
64 } else
65 sb->s_dirt = 0;
66
67 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
68 }
69
70 static struct kmem_cache * affs_inode_cachep;
71
72 static struct inode *affs_alloc_inode(struct super_block *sb)
73 {
74 struct affs_inode_info *ei;
75 ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
76 if (!ei)
77 return NULL;
78 ei->vfs_inode.i_version = 1;
79 return &ei->vfs_inode;
80 }
81
82 static void affs_destroy_inode(struct inode *inode)
83 {
84 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
85 }
86
87 static void init_once(struct kmem_cache *cachep, void *foo)
88 {
89 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
90
91 init_MUTEX(&ei->i_link_lock);
92 init_MUTEX(&ei->i_ext_lock);
93 inode_init_once(&ei->vfs_inode);
94 }
95
96 static int init_inodecache(void)
97 {
98 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
99 sizeof(struct affs_inode_info),
100 0, (SLAB_RECLAIM_ACCOUNT|
101 SLAB_MEM_SPREAD),
102 init_once);
103 if (affs_inode_cachep == NULL)
104 return -ENOMEM;
105 return 0;
106 }
107
108 static void destroy_inodecache(void)
109 {
110 kmem_cache_destroy(affs_inode_cachep);
111 }
112
113 static const struct super_operations affs_sops = {
114 .alloc_inode = affs_alloc_inode,
115 .destroy_inode = affs_destroy_inode,
116 .write_inode = affs_write_inode,
117 .put_inode = affs_put_inode,
118 .drop_inode = affs_drop_inode,
119 .delete_inode = affs_delete_inode,
120 .clear_inode = affs_clear_inode,
121 .put_super = affs_put_super,
122 .write_super = affs_write_super,
123 .statfs = affs_statfs,
124 .remount_fs = affs_remount,
125 .show_options = generic_show_options,
126 };
127
128 enum {
129 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
130 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
131 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
132 };
133
134 static match_table_t tokens = {
135 {Opt_bs, "bs=%u"},
136 {Opt_mode, "mode=%o"},
137 {Opt_mufs, "mufs"},
138 {Opt_prefix, "prefix=%s"},
139 {Opt_protect, "protect"},
140 {Opt_reserved, "reserved=%u"},
141 {Opt_root, "root=%u"},
142 {Opt_setgid, "setgid=%u"},
143 {Opt_setuid, "setuid=%u"},
144 {Opt_verbose, "verbose"},
145 {Opt_volume, "volume=%s"},
146 {Opt_ignore, "grpquota"},
147 {Opt_ignore, "noquota"},
148 {Opt_ignore, "quota"},
149 {Opt_ignore, "usrquota"},
150 {Opt_err, NULL},
151 };
152
153 static int
154 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
155 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
156 {
157 char *p;
158 substring_t args[MAX_OPT_ARGS];
159
160 /* Fill in defaults */
161
162 *uid = current->uid;
163 *gid = current->gid;
164 *reserved = 2;
165 *root = -1;
166 *blocksize = -1;
167 volume[0] = ':';
168 volume[1] = 0;
169 *mount_opts = 0;
170 if (!options)
171 return 1;
172
173 while ((p = strsep(&options, ",")) != NULL) {
174 int token, n, option;
175 if (!*p)
176 continue;
177
178 token = match_token(p, tokens, args);
179 switch (token) {
180 case Opt_bs:
181 if (match_int(&args[0], &n))
182 return -EINVAL;
183 if (n != 512 && n != 1024 && n != 2048
184 && n != 4096) {
185 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
186 return 0;
187 }
188 *blocksize = n;
189 break;
190 case Opt_mode:
191 if (match_octal(&args[0], &option))
192 return 1;
193 *mode = option & 0777;
194 *mount_opts |= SF_SETMODE;
195 break;
196 case Opt_mufs:
197 *mount_opts |= SF_MUFS;
198 break;
199 case Opt_prefix:
200 /* Free any previous prefix */
201 kfree(*prefix);
202 *prefix = NULL;
203 *prefix = match_strdup(&args[0]);
204 if (!*prefix)
205 return 0;
206 *mount_opts |= SF_PREFIX;
207 break;
208 case Opt_protect:
209 *mount_opts |= SF_IMMUTABLE;
210 break;
211 case Opt_reserved:
212 if (match_int(&args[0], reserved))
213 return 1;
214 break;
215 case Opt_root:
216 if (match_int(&args[0], root))
217 return 1;
218 break;
219 case Opt_setgid:
220 if (match_int(&args[0], &option))
221 return 1;
222 *gid = option;
223 *mount_opts |= SF_SETGID;
224 break;
225 case Opt_setuid:
226 if (match_int(&args[0], &option))
227 return -EINVAL;
228 *uid = option;
229 *mount_opts |= SF_SETUID;
230 break;
231 case Opt_verbose:
232 *mount_opts |= SF_VERBOSE;
233 break;
234 case Opt_volume: {
235 char *vol = match_strdup(&args[0]);
236 strlcpy(volume, vol, 32);
237 kfree(vol);
238 break;
239 }
240 case Opt_ignore:
241 /* Silently ignore the quota options */
242 break;
243 default:
244 printk("AFFS: Unrecognized mount option \"%s\" "
245 "or missing value\n", p);
246 return 0;
247 }
248 }
249 return 1;
250 }
251
252 /* This function definitely needs to be split up. Some fine day I'll
253 * hopefully have the guts to do so. Until then: sorry for the mess.
254 */
255
256 static int affs_fill_super(struct super_block *sb, void *data, int silent)
257 {
258 struct affs_sb_info *sbi;
259 struct buffer_head *root_bh = NULL;
260 struct buffer_head *boot_bh;
261 struct inode *root_inode = NULL;
262 s32 root_block;
263 int size, blocksize;
264 u32 chksum;
265 int num_bm;
266 int i, j;
267 s32 key;
268 uid_t uid;
269 gid_t gid;
270 int reserved;
271 unsigned long mount_flags;
272 int tmp_flags; /* fix remount prototype... */
273 u8 sig[4];
274 int ret = -EINVAL;
275
276 save_mount_options(sb, data);
277
278 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
279
280 sb->s_magic = AFFS_SUPER_MAGIC;
281 sb->s_op = &affs_sops;
282 sb->s_flags |= MS_NODIRATIME;
283
284 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
285 if (!sbi)
286 return -ENOMEM;
287 sb->s_fs_info = sbi;
288 init_MUTEX(&sbi->s_bmlock);
289
290 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
291 &blocksize,&sbi->s_prefix,
292 sbi->s_volume, &mount_flags)) {
293 printk(KERN_ERR "AFFS: Error parsing options\n");
294 return -EINVAL;
295 }
296 /* N.B. after this point s_prefix must be released */
297
298 sbi->s_flags = mount_flags;
299 sbi->s_mode = i;
300 sbi->s_uid = uid;
301 sbi->s_gid = gid;
302 sbi->s_reserved= reserved;
303
304 /* Get the size of the device in 512-byte blocks.
305 * If we later see that the partition uses bigger
306 * blocks, we will have to change it.
307 */
308
309 size = sb->s_bdev->bd_inode->i_size >> 9;
310 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
311
312 affs_set_blocksize(sb, PAGE_SIZE);
313 /* Try to find root block. Its location depends on the block size. */
314
315 i = 512;
316 j = 4096;
317 if (blocksize > 0) {
318 i = j = blocksize;
319 size = size / (blocksize / 512);
320 }
321 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
322 sbi->s_root_block = root_block;
323 if (root_block < 0)
324 sbi->s_root_block = (reserved + size - 1) / 2;
325 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
326 affs_set_blocksize(sb, blocksize);
327 sbi->s_partition_size = size;
328
329 /* The root block location that was calculated above is not
330 * correct if the partition size is an odd number of 512-
331 * byte blocks, which will be rounded down to a number of
332 * 1024-byte blocks, and if there were an even number of
333 * reserved blocks. Ideally, all partition checkers should
334 * report the real number of blocks of the real blocksize,
335 * but since this just cannot be done, we have to try to
336 * find the root block anyways. In the above case, it is one
337 * block behind the calculated one. So we check this one, too.
338 */
339 for (num_bm = 0; num_bm < 2; num_bm++) {
340 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
341 "size=%d, reserved=%d\n",
342 sb->s_id,
343 sbi->s_root_block + num_bm,
344 blocksize, size, reserved);
345 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
346 if (!root_bh)
347 continue;
348 if (!affs_checksum_block(sb, root_bh) &&
349 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
350 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
351 sbi->s_hashsize = blocksize / 4 - 56;
352 sbi->s_root_block += num_bm;
353 key = 1;
354 goto got_root;
355 }
356 affs_brelse(root_bh);
357 root_bh = NULL;
358 }
359 }
360 if (!silent)
361 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
362 sb->s_id);
363 goto out_error;
364
365 /* N.B. after this point bh must be released */
366 got_root:
367 root_block = sbi->s_root_block;
368
369 /* Find out which kind of FS we have */
370 boot_bh = sb_bread(sb, 0);
371 if (!boot_bh) {
372 printk(KERN_ERR "AFFS: Cannot read boot block\n");
373 goto out_error;
374 }
375 memcpy(sig, boot_bh->b_data, 4);
376 brelse(boot_bh);
377 chksum = be32_to_cpu(*(__be32 *)sig);
378
379 /* Dircache filesystems are compatible with non-dircache ones
380 * when reading. As long as they aren't supported, writing is
381 * not recommended.
382 */
383 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
384 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
385 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
386 sb->s_id);
387 sb->s_flags |= MS_RDONLY;
388 }
389 switch (chksum) {
390 case MUFS_FS:
391 case MUFS_INTLFFS:
392 case MUFS_DCFFS:
393 sbi->s_flags |= SF_MUFS;
394 /* fall thru */
395 case FS_INTLFFS:
396 case FS_DCFFS:
397 sbi->s_flags |= SF_INTL;
398 break;
399 case MUFS_FFS:
400 sbi->s_flags |= SF_MUFS;
401 break;
402 case FS_FFS:
403 break;
404 case MUFS_OFS:
405 sbi->s_flags |= SF_MUFS;
406 /* fall thru */
407 case FS_OFS:
408 sbi->s_flags |= SF_OFS;
409 sb->s_flags |= MS_NOEXEC;
410 break;
411 case MUFS_DCOFS:
412 case MUFS_INTLOFS:
413 sbi->s_flags |= SF_MUFS;
414 case FS_DCOFS:
415 case FS_INTLOFS:
416 sbi->s_flags |= SF_INTL | SF_OFS;
417 sb->s_flags |= MS_NOEXEC;
418 break;
419 default:
420 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
421 sb->s_id, chksum);
422 goto out_error;
423 }
424
425 if (mount_flags & SF_VERBOSE) {
426 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
427 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
428 len > 31 ? 31 : len,
429 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
430 sig, sig[3] + '', blocksize);
431 }
432
433 sb->s_flags |= MS_NODEV | MS_NOSUID;
434
435 sbi->s_data_blksize = sb->s_blocksize;
436 if (sbi->s_flags & SF_OFS)
437 sbi->s_data_blksize -= 24;
438
439 /* Keep super block in cache */
440 sbi->s_root_bh = root_bh;
441 /* N.B. after this point s_root_bh must be released */
442
443 tmp_flags = sb->s_flags;
444 if (affs_init_bitmap(sb, &tmp_flags))
445 goto out_error;
446 sb->s_flags = tmp_flags;
447
448 /* set up enough so that it can read an inode */
449
450 root_inode = affs_iget(sb, root_block);
451 if (IS_ERR(root_inode)) {
452 ret = PTR_ERR(root_inode);
453 goto out_error_noinode;
454 }
455
456 sb->s_root = d_alloc_root(root_inode);
457 if (!sb->s_root) {
458 printk(KERN_ERR "AFFS: Get root inode failed\n");
459 goto out_error;
460 }
461 sb->s_root->d_op = &affs_dentry_operations;
462
463 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
464 return 0;
465
466 /*
467 * Begin the cascaded cleanup ...
468 */
469 out_error:
470 if (root_inode)
471 iput(root_inode);
472 out_error_noinode:
473 kfree(sbi->s_bitmap);
474 affs_brelse(root_bh);
475 kfree(sbi->s_prefix);
476 kfree(sbi);
477 sb->s_fs_info = NULL;
478 return ret;
479 }
480
481 static int
482 affs_remount(struct super_block *sb, int *flags, char *data)
483 {
484 struct affs_sb_info *sbi = AFFS_SB(sb);
485 int blocksize;
486 uid_t uid;
487 gid_t gid;
488 int mode;
489 int reserved;
490 int root_block;
491 unsigned long mount_flags;
492 int res = 0;
493 char *new_opts = kstrdup(data, GFP_KERNEL);
494
495 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
496
497 *flags |= MS_NODIRATIME;
498
499 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
500 &blocksize, &sbi->s_prefix, sbi->s_volume,
501 &mount_flags)) {
502 kfree(new_opts);
503 return -EINVAL;
504 }
505 kfree(sb->s_options);
506 sb->s_options = new_opts;
507
508 sbi->s_flags = mount_flags;
509 sbi->s_mode = mode;
510 sbi->s_uid = uid;
511 sbi->s_gid = gid;
512
513 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
514 return 0;
515 if (*flags & MS_RDONLY) {
516 sb->s_dirt = 1;
517 while (sb->s_dirt)
518 affs_write_super(sb);
519 affs_free_bitmap(sb);
520 } else
521 res = affs_init_bitmap(sb, flags);
522
523 return res;
524 }
525
526 static int
527 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
528 {
529 struct super_block *sb = dentry->d_sb;
530 int free;
531
532 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
533 AFFS_SB(sb)->s_reserved);
534
535 free = affs_count_free_blocks(sb);
536 buf->f_type = AFFS_SUPER_MAGIC;
537 buf->f_bsize = sb->s_blocksize;
538 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
539 buf->f_bfree = free;
540 buf->f_bavail = free;
541 return 0;
542 }
543
544 static int affs_get_sb(struct file_system_type *fs_type,
545 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
546 {
547 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
548 mnt);
549 }
550
551 static struct file_system_type affs_fs_type = {
552 .owner = THIS_MODULE,
553 .name = "affs",
554 .get_sb = affs_get_sb,
555 .kill_sb = kill_block_super,
556 .fs_flags = FS_REQUIRES_DEV,
557 };
558
559 static int __init init_affs_fs(void)
560 {
561 int err = init_inodecache();
562 if (err)
563 goto out1;
564 err = register_filesystem(&affs_fs_type);
565 if (err)
566 goto out;
567 return 0;
568 out:
569 destroy_inodecache();
570 out1:
571 return err;
572 }
573
574 static void __exit exit_affs_fs(void)
575 {
576 unregister_filesystem(&affs_fs_type);
577 destroy_inodecache();
578 }
579
580 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
581 MODULE_LICENSE("GPL");
582
583 module_init(init_affs_fs)
584 module_exit(exit_affs_fs)
585
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