blob: 959dbff2d42dc4a0a0026e3b3aad5f7f0008a7f3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/adfs/super.c
3 *
4 * Copyright (C) 1997-1999 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/init.h>
12#include <linux/buffer_head.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/parser.h>
Miklos Szeredie11400b2008-02-08 04:21:35 -080014#include <linux/mount.h>
15#include <linux/seq_file.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Alexey Dobriyan405f5572009-07-11 22:08:37 +040017#include <linux/smp_lock.h>
Al Viro608ba502009-06-16 14:52:13 -040018#include <linux/statfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include "adfs.h"
20#include "dir_f.h"
21#include "dir_fplus.h"
22
Miklos Szeredie11400b2008-02-08 04:21:35 -080023#define ADFS_DEFAULT_OWNER_MASK S_IRWXU
24#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...)
27{
28 char error_buf[128];
29 va_list args;
30
31 va_start(args, fmt);
Alexey Dobriyan4a6e6172006-12-06 20:37:04 -080032 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 va_end(args);
34
35 printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n",
36 sb->s_id, function ? ": " : "",
37 function ? function : "", error_buf);
38}
39
40static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
41{
42 int i;
43
44 /* sector size must be 256, 512 or 1024 bytes */
45 if (dr->log2secsize != 8 &&
46 dr->log2secsize != 9 &&
47 dr->log2secsize != 10)
48 return 1;
49
50 /* idlen must be at least log2secsize + 3 */
51 if (dr->idlen < dr->log2secsize + 3)
52 return 1;
53
54 /* we cannot have such a large disc that we
55 * are unable to represent sector offsets in
56 * 32 bits. This works out at 2.0 TB.
57 */
58 if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
59 return 1;
60
61 /* idlen must be no greater than 19 v2 [1.0] */
62 if (dr->idlen > 19)
63 return 1;
64
65 /* reserved bytes should be zero */
66 for (i = 0; i < sizeof(dr->unused52); i++)
67 if (dr->unused52[i] != 0)
68 return 1;
69
70 return 0;
71}
72
73static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map)
74{
75 unsigned int v0, v1, v2, v3;
76 int i;
77
78 v0 = v1 = v2 = v3 = 0;
79 for (i = sb->s_blocksize - 4; i; i -= 4) {
80 v0 += map[i] + (v3 >> 8);
81 v3 &= 0xff;
82 v1 += map[i + 1] + (v0 >> 8);
83 v0 &= 0xff;
84 v2 += map[i + 2] + (v1 >> 8);
85 v1 &= 0xff;
86 v3 += map[i + 3] + (v2 >> 8);
87 v2 &= 0xff;
88 }
89 v0 += v3 >> 8;
90 v1 += map[1] + (v0 >> 8);
91 v2 += map[2] + (v1 >> 8);
92 v3 += map[3] + (v2 >> 8);
93
94 return v0 ^ v1 ^ v2 ^ v3;
95}
96
97static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm)
98{
99 unsigned char crosscheck = 0, zonecheck = 1;
100 int i;
101
102 for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
103 unsigned char *map;
104
105 map = dm[i].dm_bh->b_data;
106
107 if (adfs_calczonecheck(sb, map) != map[0]) {
108 adfs_error(sb, "zone %d fails zonecheck", i);
109 zonecheck = 0;
110 }
111 crosscheck ^= map[3];
112 }
113 if (crosscheck != 0xff)
114 adfs_error(sb, "crosscheck != 0xff");
115 return crosscheck == 0xff && zonecheck;
116}
117
118static void adfs_put_super(struct super_block *sb)
119{
120 int i;
121 struct adfs_sb_info *asb = ADFS_SB(sb);
122
Christoph Hellwig6cfd0142009-05-05 15:40:36 +0200123 lock_kernel();
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 for (i = 0; i < asb->s_map_size; i++)
126 brelse(asb->s_map[i].dm_bh);
127 kfree(asb->s_map);
128 kfree(asb);
129 sb->s_fs_info = NULL;
Christoph Hellwig6cfd0142009-05-05 15:40:36 +0200130
131 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132}
133
Miklos Szeredie11400b2008-02-08 04:21:35 -0800134static int adfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
135{
136 struct adfs_sb_info *asb = ADFS_SB(mnt->mnt_sb);
137
138 if (asb->s_uid != 0)
139 seq_printf(seq, ",uid=%u", asb->s_uid);
140 if (asb->s_gid != 0)
141 seq_printf(seq, ",gid=%u", asb->s_gid);
142 if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
143 seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
144 if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
145 seq_printf(seq, ",othmask=%o", asb->s_other_mask);
146
147 return 0;
148}
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err};
151
Steven Whitehousea447c092008-10-13 10:46:57 +0100152static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 {Opt_uid, "uid=%u"},
154 {Opt_gid, "gid=%u"},
155 {Opt_ownmask, "ownmask=%o"},
156 {Opt_othmask, "othmask=%o"},
157 {Opt_err, NULL}
158};
159
160static int parse_options(struct super_block *sb, char *options)
161{
162 char *p;
163 struct adfs_sb_info *asb = ADFS_SB(sb);
164 int option;
165
166 if (!options)
167 return 0;
168
169 while ((p = strsep(&options, ",")) != NULL) {
170 substring_t args[MAX_OPT_ARGS];
171 int token;
172 if (!*p)
173 continue;
174
175 token = match_token(p, tokens, args);
176 switch (token) {
177 case Opt_uid:
178 if (match_int(args, &option))
179 return -EINVAL;
180 asb->s_uid = option;
181 break;
182 case Opt_gid:
183 if (match_int(args, &option))
184 return -EINVAL;
185 asb->s_gid = option;
186 break;
187 case Opt_ownmask:
188 if (match_octal(args, &option))
189 return -EINVAL;
190 asb->s_owner_mask = option;
191 break;
192 case Opt_othmask:
193 if (match_octal(args, &option))
194 return -EINVAL;
195 asb->s_other_mask = option;
196 break;
197 default:
198 printk("ADFS-fs: unrecognised mount option \"%s\" "
199 "or missing value\n", p);
200 return -EINVAL;
201 }
202 }
203 return 0;
204}
205
206static int adfs_remount(struct super_block *sb, int *flags, char *data)
207{
208 *flags |= MS_NODIRATIME;
209 return parse_options(sb, data);
210}
211
David Howells726c3342006-06-23 02:02:58 -0700212static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213{
Coly Liaccb4012009-04-02 16:59:27 -0700214 struct super_block *sb = dentry->d_sb;
215 struct adfs_sb_info *sbi = ADFS_SB(sb);
216 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218 buf->f_type = ADFS_SUPER_MAGIC;
Coly Liaccb4012009-04-02 16:59:27 -0700219 buf->f_namelen = sbi->s_namelen;
220 buf->f_bsize = sb->s_blocksize;
221 buf->f_blocks = sbi->s_size;
222 buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 buf->f_bavail =
Coly Liaccb4012009-04-02 16:59:27 -0700224 buf->f_bfree = adfs_map_free(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
Coly Liaccb4012009-04-02 16:59:27 -0700226 buf->f_fsid.val[0] = (u32)id;
227 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
229 return 0;
230}
231
Christoph Lametere18b8902006-12-06 20:33:20 -0800232static struct kmem_cache *adfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234static struct inode *adfs_alloc_inode(struct super_block *sb)
235{
236 struct adfs_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -0800237 ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 if (!ei)
239 return NULL;
240 return &ei->vfs_inode;
241}
242
243static void adfs_destroy_inode(struct inode *inode)
244{
245 kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
246}
247
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700248static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
250 struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
251
Christoph Lametera35afb82007-05-16 22:10:57 -0700252 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
Paul Mundt20c2df82007-07-20 10:11:58 +0900254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255static int init_inodecache(void)
256{
257 adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
258 sizeof(struct adfs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800259 0, (SLAB_RECLAIM_ACCOUNT|
260 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900261 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 if (adfs_inode_cachep == NULL)
263 return -ENOMEM;
264 return 0;
265}
266
267static void destroy_inodecache(void)
268{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700269 kmem_cache_destroy(adfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270}
271
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800272static const struct super_operations adfs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 .alloc_inode = adfs_alloc_inode,
274 .destroy_inode = adfs_destroy_inode,
275 .write_inode = adfs_write_inode,
276 .put_super = adfs_put_super,
277 .statfs = adfs_statfs,
278 .remount_fs = adfs_remount,
Miklos Szeredie11400b2008-02-08 04:21:35 -0800279 .show_options = adfs_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280};
281
282static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
283{
284 struct adfs_discmap *dm;
285 unsigned int map_addr, zone_size, nzones;
286 int i, zone;
287 struct adfs_sb_info *asb = ADFS_SB(sb);
288
289 nzones = asb->s_map_size;
290 zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
291 map_addr = (nzones >> 1) * zone_size -
292 ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
293 map_addr = signed_asl(map_addr, asb->s_map2blk);
294
295 asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
296
297 dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
298 if (dm == NULL) {
299 adfs_error(sb, "not enough memory");
300 return NULL;
301 }
302
303 for (zone = 0; zone < nzones; zone++, map_addr++) {
304 dm[zone].dm_startbit = 0;
305 dm[zone].dm_endbit = zone_size;
306 dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
307 dm[zone].dm_bh = sb_bread(sb, map_addr);
308
309 if (!dm[zone].dm_bh) {
310 adfs_error(sb, "unable to read map");
311 goto error_free;
312 }
313 }
314
315 /* adjust the limits for the first and last map zones */
316 i = zone - 1;
317 dm[0].dm_startblk = 0;
318 dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
319 dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
320 (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
321 (ADFS_DR_SIZE_BITS - i * zone_size);
322
323 if (adfs_checkmap(sb, dm))
324 return dm;
325
Andrew Morton1725cd02006-08-13 23:24:17 -0700326 adfs_error(sb, "map corrupted");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328error_free:
329 while (--zone >= 0)
330 brelse(dm[zone].dm_bh);
331
332 kfree(dm);
333 return NULL;
334}
335
336static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
337{
338 unsigned long discsize;
339
340 discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
341 discsize |= le32_to_cpu(dr->disc_size) >> block_bits;
342
343 return discsize;
344}
345
346static int adfs_fill_super(struct super_block *sb, void *data, int silent)
347{
348 struct adfs_discrecord *dr;
349 struct buffer_head *bh;
350 struct object_info root_obj;
351 unsigned char *b_data;
352 struct adfs_sb_info *asb;
353 struct inode *root;
354
Jan Blunckdb719222010-08-15 22:51:10 +0200355 lock_kernel();
356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 sb->s_flags |= MS_NODIRATIME;
358
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700359 asb = kzalloc(sizeof(*asb), GFP_KERNEL);
Jan Blunckdb719222010-08-15 22:51:10 +0200360 if (!asb) {
361 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 return -ENOMEM;
Jan Blunckdb719222010-08-15 22:51:10 +0200363 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 sb->s_fs_info = asb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
366 /* set default options */
367 asb->s_uid = 0;
368 asb->s_gid = 0;
Miklos Szeredie11400b2008-02-08 04:21:35 -0800369 asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
370 asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372 if (parse_options(sb, data))
373 goto error;
374
375 sb_set_blocksize(sb, BLOCK_SIZE);
376 if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
377 adfs_error(sb, "unable to read superblock");
378 goto error;
379 }
380
381 b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
382
383 if (adfs_checkbblk(b_data)) {
384 if (!silent)
385 printk("VFS: Can't find an adfs filesystem on dev "
386 "%s.\n", sb->s_id);
387 goto error_free_bh;
388 }
389
390 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
391
392 /*
393 * Do some sanity checks on the ADFS disc record
394 */
395 if (adfs_checkdiscrecord(dr)) {
396 if (!silent)
397 printk("VPS: Can't find an adfs filesystem on dev "
398 "%s.\n", sb->s_id);
399 goto error_free_bh;
400 }
401
402 brelse(bh);
403 if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
404 bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
405 if (!bh) {
406 adfs_error(sb, "couldn't read superblock on "
407 "2nd try.");
408 goto error;
409 }
410 b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
411 if (adfs_checkbblk(b_data)) {
412 adfs_error(sb, "disc record mismatch, very weird!");
413 goto error_free_bh;
414 }
415 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
416 } else {
417 if (!silent)
418 printk(KERN_ERR "VFS: Unsupported blocksize on dev "
419 "%s.\n", sb->s_id);
420 goto error;
421 }
422
423 /*
424 * blocksize on this device should now be set to the ADFS log2secsize
425 */
426
427 sb->s_magic = ADFS_SUPER_MAGIC;
428 asb->s_idlen = dr->idlen;
429 asb->s_map_size = dr->nzones | (dr->nzones_high << 8);
430 asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
431 asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
432 asb->s_version = dr->format_version;
433 asb->s_log2sharesize = dr->log2sharesize;
434
435 asb->s_map = adfs_read_map(sb, dr);
436 if (!asb->s_map)
437 goto error_free_bh;
438
439 brelse(bh);
440
441 /*
442 * set up enough so that we can read an inode
443 */
444 sb->s_op = &adfs_sops;
445
446 dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
447
448 root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
449 root_obj.name_len = 0;
450 root_obj.loadaddr = 0;
451 root_obj.execaddr = 0;
452 root_obj.size = ADFS_NEWDIR_SIZE;
453 root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
454 ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
455
456 /*
457 * If this is a F+ disk with variable length directories,
458 * get the root_size from the disc record.
459 */
460 if (asb->s_version) {
461 root_obj.size = le32_to_cpu(dr->root_size);
462 asb->s_dir = &adfs_fplus_dir_ops;
463 asb->s_namelen = ADFS_FPLUS_NAME_LEN;
464 } else {
465 asb->s_dir = &adfs_f_dir_ops;
466 asb->s_namelen = ADFS_F_NAME_LEN;
467 }
468
469 root = adfs_iget(sb, &root_obj);
470 sb->s_root = d_alloc_root(root);
471 if (!sb->s_root) {
472 int i;
473 iput(root);
474 for (i = 0; i < asb->s_map_size; i++)
475 brelse(asb->s_map[i].dm_bh);
476 kfree(asb->s_map);
477 adfs_error(sb, "get root inode failed\n");
478 goto error;
479 } else
480 sb->s_root->d_op = &adfs_dentry_operations;
Jan Blunckdb719222010-08-15 22:51:10 +0200481 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 return 0;
483
484error_free_bh:
485 brelse(bh);
486error:
487 sb->s_fs_info = NULL;
488 kfree(asb);
Jan Blunckdb719222010-08-15 22:51:10 +0200489 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 return -EINVAL;
491}
492
Al Viro152a0832010-07-25 00:46:55 +0400493static struct dentry *adfs_mount(struct file_system_type *fs_type,
494 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495{
Al Viro152a0832010-07-25 00:46:55 +0400496 return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497}
498
499static struct file_system_type adfs_fs_type = {
500 .owner = THIS_MODULE,
501 .name = "adfs",
Al Viro152a0832010-07-25 00:46:55 +0400502 .mount = adfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 .kill_sb = kill_block_super,
504 .fs_flags = FS_REQUIRES_DEV,
505};
506
507static int __init init_adfs_fs(void)
508{
509 int err = init_inodecache();
510 if (err)
511 goto out1;
512 err = register_filesystem(&adfs_fs_type);
513 if (err)
514 goto out;
515 return 0;
516out:
517 destroy_inodecache();
518out1:
519 return err;
520}
521
522static void __exit exit_adfs_fs(void)
523{
524 unregister_filesystem(&adfs_fs_type);
525 destroy_inodecache();
526}
527
528module_init(init_adfs_fs)
529module_exit(exit_adfs_fs)
Al Viro608ba502009-06-16 14:52:13 -0400530MODULE_LICENSE("GPL");