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1/*
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>
11#include <linux/init.h>
12#include <linux/buffer_head.h>
13#include <linux/parser.h>
14#include <linux/mount.h>
15#include <linux/seq_file.h>
16#include <linux/slab.h>
17#include <linux/statfs.h>
18#include <linux/user_namespace.h>
19#include "adfs.h"
20#include "dir_f.h"
21#include "dir_fplus.h"
22
23#define ADFS_DEFAULT_OWNER_MASK S_IRWXU
24#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)
25
26void __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);
32 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
33 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
123 for (i = 0; i < asb->s_map_size; i++)
124 brelse(asb->s_map[i].dm_bh);
125 kfree(asb->s_map);
126 kfree_rcu(asb, rcu);
127}
128
129static int adfs_show_options(struct seq_file *seq, struct dentry *root)
130{
131 struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
132
133 if (!uid_eq(asb->s_uid, GLOBAL_ROOT_UID))
134 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, asb->s_uid));
135 if (!gid_eq(asb->s_gid, GLOBAL_ROOT_GID))
136 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, asb->s_gid));
137 if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
138 seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
139 if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
140 seq_printf(seq, ",othmask=%o", asb->s_other_mask);
141 if (asb->s_ftsuffix != 0)
142 seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
143
144 return 0;
145}
146
147enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
148
149static const match_table_t tokens = {
150 {Opt_uid, "uid=%u"},
151 {Opt_gid, "gid=%u"},
152 {Opt_ownmask, "ownmask=%o"},
153 {Opt_othmask, "othmask=%o"},
154 {Opt_ftsuffix, "ftsuffix=%u"},
155 {Opt_err, NULL}
156};
157
158static int parse_options(struct super_block *sb, char *options)
159{
160 char *p;
161 struct adfs_sb_info *asb = ADFS_SB(sb);
162 int option;
163
164 if (!options)
165 return 0;
166
167 while ((p = strsep(&options, ",")) != NULL) {
168 substring_t args[MAX_OPT_ARGS];
169 int token;
170 if (!*p)
171 continue;
172
173 token = match_token(p, tokens, args);
174 switch (token) {
175 case Opt_uid:
176 if (match_int(args, &option))
177 return -EINVAL;
178 asb->s_uid = make_kuid(current_user_ns(), option);
179 if (!uid_valid(asb->s_uid))
180 return -EINVAL;
181 break;
182 case Opt_gid:
183 if (match_int(args, &option))
184 return -EINVAL;
185 asb->s_gid = make_kgid(current_user_ns(), option);
186 if (!gid_valid(asb->s_gid))
187 return -EINVAL;
188 break;
189 case Opt_ownmask:
190 if (match_octal(args, &option))
191 return -EINVAL;
192 asb->s_owner_mask = option;
193 break;
194 case Opt_othmask:
195 if (match_octal(args, &option))
196 return -EINVAL;
197 asb->s_other_mask = option;
198 break;
199 case Opt_ftsuffix:
200 if (match_int(args, &option))
201 return -EINVAL;
202 asb->s_ftsuffix = option;
203 break;
204 default:
205 printk("ADFS-fs: unrecognised mount option \"%s\" "
206 "or missing value\n", p);
207 return -EINVAL;
208 }
209 }
210 return 0;
211}
212
213static int adfs_remount(struct super_block *sb, int *flags, char *data)
214{
215 sync_filesystem(sb);
216 *flags |= MS_NODIRATIME;
217 return parse_options(sb, data);
218}
219
220static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
221{
222 struct super_block *sb = dentry->d_sb;
223 struct adfs_sb_info *sbi = ADFS_SB(sb);
224 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
225
226 buf->f_type = ADFS_SUPER_MAGIC;
227 buf->f_namelen = sbi->s_namelen;
228 buf->f_bsize = sb->s_blocksize;
229 buf->f_blocks = sbi->s_size;
230 buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
231 buf->f_bavail =
232 buf->f_bfree = adfs_map_free(sb);
233 buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
234 buf->f_fsid.val[0] = (u32)id;
235 buf->f_fsid.val[1] = (u32)(id >> 32);
236
237 return 0;
238}
239
240static struct kmem_cache *adfs_inode_cachep;
241
242static struct inode *adfs_alloc_inode(struct super_block *sb)
243{
244 struct adfs_inode_info *ei;
245 ei = kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
246 if (!ei)
247 return NULL;
248 return &ei->vfs_inode;
249}
250
251static void adfs_i_callback(struct rcu_head *head)
252{
253 struct inode *inode = container_of(head, struct inode, i_rcu);
254 kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
255}
256
257static void adfs_destroy_inode(struct inode *inode)
258{
259 call_rcu(&inode->i_rcu, adfs_i_callback);
260}
261
262static void init_once(void *foo)
263{
264 struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
265
266 inode_init_once(&ei->vfs_inode);
267}
268
269static int __init init_inodecache(void)
270{
271 adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
272 sizeof(struct adfs_inode_info),
273 0, (SLAB_RECLAIM_ACCOUNT|
274 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
275 init_once);
276 if (adfs_inode_cachep == NULL)
277 return -ENOMEM;
278 return 0;
279}
280
281static void destroy_inodecache(void)
282{
283 /*
284 * Make sure all delayed rcu free inodes are flushed before we
285 * destroy cache.
286 */
287 rcu_barrier();
288 kmem_cache_destroy(adfs_inode_cachep);
289}
290
291static const struct super_operations adfs_sops = {
292 .alloc_inode = adfs_alloc_inode,
293 .destroy_inode = adfs_destroy_inode,
294 .write_inode = adfs_write_inode,
295 .put_super = adfs_put_super,
296 .statfs = adfs_statfs,
297 .remount_fs = adfs_remount,
298 .show_options = adfs_show_options,
299};
300
301static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
302{
303 struct adfs_discmap *dm;
304 unsigned int map_addr, zone_size, nzones;
305 int i, zone;
306 struct adfs_sb_info *asb = ADFS_SB(sb);
307
308 nzones = asb->s_map_size;
309 zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
310 map_addr = (nzones >> 1) * zone_size -
311 ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
312 map_addr = signed_asl(map_addr, asb->s_map2blk);
313
314 asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
315
316 dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
317 if (dm == NULL) {
318 adfs_error(sb, "not enough memory");
319 return ERR_PTR(-ENOMEM);
320 }
321
322 for (zone = 0; zone < nzones; zone++, map_addr++) {
323 dm[zone].dm_startbit = 0;
324 dm[zone].dm_endbit = zone_size;
325 dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
326 dm[zone].dm_bh = sb_bread(sb, map_addr);
327
328 if (!dm[zone].dm_bh) {
329 adfs_error(sb, "unable to read map");
330 goto error_free;
331 }
332 }
333
334 /* adjust the limits for the first and last map zones */
335 i = zone - 1;
336 dm[0].dm_startblk = 0;
337 dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
338 dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
339 (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
340 (ADFS_DR_SIZE_BITS - i * zone_size);
341
342 if (adfs_checkmap(sb, dm))
343 return dm;
344
345 adfs_error(sb, "map corrupted");
346
347error_free:
348 while (--zone >= 0)
349 brelse(dm[zone].dm_bh);
350
351 kfree(dm);
352 return ERR_PTR(-EIO);
353}
354
355static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
356{
357 unsigned long discsize;
358
359 discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
360 discsize |= le32_to_cpu(dr->disc_size) >> block_bits;
361
362 return discsize;
363}
364
365static int adfs_fill_super(struct super_block *sb, void *data, int silent)
366{
367 struct adfs_discrecord *dr;
368 struct buffer_head *bh;
369 struct object_info root_obj;
370 unsigned char *b_data;
371 struct adfs_sb_info *asb;
372 struct inode *root;
373 int ret = -EINVAL;
374
375 sb->s_flags |= MS_NODIRATIME;
376
377 asb = kzalloc(sizeof(*asb), GFP_KERNEL);
378 if (!asb)
379 return -ENOMEM;
380 sb->s_fs_info = asb;
381
382 /* set default options */
383 asb->s_uid = GLOBAL_ROOT_UID;
384 asb->s_gid = GLOBAL_ROOT_GID;
385 asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
386 asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
387 asb->s_ftsuffix = 0;
388
389 if (parse_options(sb, data))
390 goto error;
391
392 sb_set_blocksize(sb, BLOCK_SIZE);
393 if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
394 adfs_error(sb, "unable to read superblock");
395 ret = -EIO;
396 goto error;
397 }
398
399 b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
400
401 if (adfs_checkbblk(b_data)) {
402 if (!silent)
403 printk("VFS: Can't find an adfs filesystem on dev "
404 "%s.\n", sb->s_id);
405 ret = -EINVAL;
406 goto error_free_bh;
407 }
408
409 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
410
411 /*
412 * Do some sanity checks on the ADFS disc record
413 */
414 if (adfs_checkdiscrecord(dr)) {
415 if (!silent)
416 printk("VPS: Can't find an adfs filesystem on dev "
417 "%s.\n", sb->s_id);
418 ret = -EINVAL;
419 goto error_free_bh;
420 }
421
422 brelse(bh);
423 if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
424 bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
425 if (!bh) {
426 adfs_error(sb, "couldn't read superblock on "
427 "2nd try.");
428 ret = -EIO;
429 goto error;
430 }
431 b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
432 if (adfs_checkbblk(b_data)) {
433 adfs_error(sb, "disc record mismatch, very weird!");
434 ret = -EINVAL;
435 goto error_free_bh;
436 }
437 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
438 } else {
439 if (!silent)
440 printk(KERN_ERR "VFS: Unsupported blocksize on dev "
441 "%s.\n", sb->s_id);
442 ret = -EINVAL;
443 goto error;
444 }
445
446 /*
447 * blocksize on this device should now be set to the ADFS log2secsize
448 */
449
450 sb->s_magic = ADFS_SUPER_MAGIC;
451 asb->s_idlen = dr->idlen;
452 asb->s_map_size = dr->nzones | (dr->nzones_high << 8);
453 asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
454 asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
455 asb->s_version = dr->format_version;
456 asb->s_log2sharesize = dr->log2sharesize;
457
458 asb->s_map = adfs_read_map(sb, dr);
459 if (IS_ERR(asb->s_map)) {
460 ret = PTR_ERR(asb->s_map);
461 goto error_free_bh;
462 }
463
464 brelse(bh);
465
466 /*
467 * set up enough so that we can read an inode
468 */
469 sb->s_op = &adfs_sops;
470
471 dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
472
473 root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
474 root_obj.name_len = 0;
475 /* Set root object date as 01 Jan 1987 00:00:00 */
476 root_obj.loadaddr = 0xfff0003f;
477 root_obj.execaddr = 0xec22c000;
478 root_obj.size = ADFS_NEWDIR_SIZE;
479 root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
480 ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
481 root_obj.filetype = -1;
482
483 /*
484 * If this is a F+ disk with variable length directories,
485 * get the root_size from the disc record.
486 */
487 if (asb->s_version) {
488 root_obj.size = le32_to_cpu(dr->root_size);
489 asb->s_dir = &adfs_fplus_dir_ops;
490 asb->s_namelen = ADFS_FPLUS_NAME_LEN;
491 } else {
492 asb->s_dir = &adfs_f_dir_ops;
493 asb->s_namelen = ADFS_F_NAME_LEN;
494 }
495 /*
496 * ,xyz hex filetype suffix may be added by driver
497 * to files that have valid RISC OS filetype
498 */
499 if (asb->s_ftsuffix)
500 asb->s_namelen += 4;
501
502 sb->s_d_op = &adfs_dentry_operations;
503 root = adfs_iget(sb, &root_obj);
504 sb->s_root = d_make_root(root);
505 if (!sb->s_root) {
506 int i;
507 for (i = 0; i < asb->s_map_size; i++)
508 brelse(asb->s_map[i].dm_bh);
509 kfree(asb->s_map);
510 adfs_error(sb, "get root inode failed\n");
511 ret = -EIO;
512 goto error;
513 }
514 return 0;
515
516error_free_bh:
517 brelse(bh);
518error:
519 sb->s_fs_info = NULL;
520 kfree(asb);
521 return ret;
522}
523
524static struct dentry *adfs_mount(struct file_system_type *fs_type,
525 int flags, const char *dev_name, void *data)
526{
527 return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
528}
529
530static struct file_system_type adfs_fs_type = {
531 .owner = THIS_MODULE,
532 .name = "adfs",
533 .mount = adfs_mount,
534 .kill_sb = kill_block_super,
535 .fs_flags = FS_REQUIRES_DEV,
536};
537MODULE_ALIAS_FS("adfs");
538
539static int __init init_adfs_fs(void)
540{
541 int err = init_inodecache();
542 if (err)
543 goto out1;
544 err = register_filesystem(&adfs_fs_type);
545 if (err)
546 goto out;
547 return 0;
548out:
549 destroy_inodecache();
550out1:
551 return err;
552}
553
554static void __exit exit_adfs_fs(void)
555{
556 unregister_filesystem(&adfs_fs_type);
557 destroy_inodecache();
558}
559
560module_init(init_adfs_fs)
561module_exit(exit_adfs_fs)
562MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/adfs/super.c
4 *
5 * Copyright (C) 1997-1999 Russell King
6 */
7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/parser.h>
10#include <linux/mount.h>
11#include <linux/seq_file.h>
12#include <linux/slab.h>
13#include <linux/statfs.h>
14#include <linux/user_namespace.h>
15#include <linux/blkdev.h>
16#include "adfs.h"
17#include "dir_f.h"
18#include "dir_fplus.h"
19
20#define ADFS_SB_FLAGS SB_NOATIME
21
22#define ADFS_DEFAULT_OWNER_MASK S_IRWXU
23#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)
24
25void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...)
26{
27 struct va_format vaf;
28 va_list args;
29
30 va_start(args, fmt);
31 vaf.fmt = fmt;
32 vaf.va = &args;
33
34 printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %pV\n",
35 sb->s_id, function ? ": " : "",
36 function ? function : "", &vaf);
37
38 va_end(args);
39}
40
41void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...)
42{
43 struct va_format vaf;
44 va_list args;
45
46 va_start(args, fmt);
47 vaf.fmt = fmt;
48 vaf.va = &args;
49 printk("%sADFS-fs (%s): %pV\n", pfx, sb->s_id, &vaf);
50 va_end(args);
51}
52
53static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
54{
55 unsigned int max_idlen;
56 int i;
57
58 /* sector size must be 256, 512 or 1024 bytes */
59 if (dr->log2secsize != 8 &&
60 dr->log2secsize != 9 &&
61 dr->log2secsize != 10)
62 return 1;
63
64 /* idlen must be at least log2secsize + 3 */
65 if (dr->idlen < dr->log2secsize + 3)
66 return 1;
67
68 /* we cannot have such a large disc that we
69 * are unable to represent sector offsets in
70 * 32 bits. This works out at 2.0 TB.
71 */
72 if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
73 return 1;
74
75 /*
76 * Maximum idlen is limited to 16 bits for new directories by
77 * the three-byte storage of an indirect disc address. For
78 * big directories, idlen must be no greater than 19 v2 [1.0]
79 */
80 max_idlen = dr->format_version ? 19 : 16;
81 if (dr->idlen > max_idlen)
82 return 1;
83
84 /* reserved bytes should be zero */
85 for (i = 0; i < sizeof(dr->unused52); i++)
86 if (dr->unused52[i] != 0)
87 return 1;
88
89 return 0;
90}
91
92static void adfs_put_super(struct super_block *sb)
93{
94 struct adfs_sb_info *asb = ADFS_SB(sb);
95
96 adfs_free_map(sb);
97 kfree_rcu(asb, rcu);
98}
99
100static int adfs_show_options(struct seq_file *seq, struct dentry *root)
101{
102 struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
103
104 if (!uid_eq(asb->s_uid, GLOBAL_ROOT_UID))
105 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, asb->s_uid));
106 if (!gid_eq(asb->s_gid, GLOBAL_ROOT_GID))
107 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, asb->s_gid));
108 if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
109 seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
110 if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
111 seq_printf(seq, ",othmask=%o", asb->s_other_mask);
112 if (asb->s_ftsuffix != 0)
113 seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
114
115 return 0;
116}
117
118enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
119
120static const match_table_t tokens = {
121 {Opt_uid, "uid=%u"},
122 {Opt_gid, "gid=%u"},
123 {Opt_ownmask, "ownmask=%o"},
124 {Opt_othmask, "othmask=%o"},
125 {Opt_ftsuffix, "ftsuffix=%u"},
126 {Opt_err, NULL}
127};
128
129static int parse_options(struct super_block *sb, struct adfs_sb_info *asb,
130 char *options)
131{
132 char *p;
133 int option;
134
135 if (!options)
136 return 0;
137
138 while ((p = strsep(&options, ",")) != NULL) {
139 substring_t args[MAX_OPT_ARGS];
140 int token;
141 if (!*p)
142 continue;
143
144 token = match_token(p, tokens, args);
145 switch (token) {
146 case Opt_uid:
147 if (match_int(args, &option))
148 return -EINVAL;
149 asb->s_uid = make_kuid(current_user_ns(), option);
150 if (!uid_valid(asb->s_uid))
151 return -EINVAL;
152 break;
153 case Opt_gid:
154 if (match_int(args, &option))
155 return -EINVAL;
156 asb->s_gid = make_kgid(current_user_ns(), option);
157 if (!gid_valid(asb->s_gid))
158 return -EINVAL;
159 break;
160 case Opt_ownmask:
161 if (match_octal(args, &option))
162 return -EINVAL;
163 asb->s_owner_mask = option;
164 break;
165 case Opt_othmask:
166 if (match_octal(args, &option))
167 return -EINVAL;
168 asb->s_other_mask = option;
169 break;
170 case Opt_ftsuffix:
171 if (match_int(args, &option))
172 return -EINVAL;
173 asb->s_ftsuffix = option;
174 break;
175 default:
176 adfs_msg(sb, KERN_ERR,
177 "unrecognised mount option \"%s\" or missing value",
178 p);
179 return -EINVAL;
180 }
181 }
182 return 0;
183}
184
185static int adfs_remount(struct super_block *sb, int *flags, char *data)
186{
187 struct adfs_sb_info temp_asb;
188 int ret;
189
190 sync_filesystem(sb);
191 *flags |= ADFS_SB_FLAGS;
192
193 temp_asb = *ADFS_SB(sb);
194 ret = parse_options(sb, &temp_asb, data);
195 if (ret == 0)
196 *ADFS_SB(sb) = temp_asb;
197
198 return ret;
199}
200
201static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
202{
203 struct super_block *sb = dentry->d_sb;
204 struct adfs_sb_info *sbi = ADFS_SB(sb);
205 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
206
207 adfs_map_statfs(sb, buf);
208
209 buf->f_type = ADFS_SUPER_MAGIC;
210 buf->f_namelen = sbi->s_namelen;
211 buf->f_bsize = sb->s_blocksize;
212 buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
213 buf->f_fsid.val[0] = (u32)id;
214 buf->f_fsid.val[1] = (u32)(id >> 32);
215
216 return 0;
217}
218
219static struct kmem_cache *adfs_inode_cachep;
220
221static struct inode *adfs_alloc_inode(struct super_block *sb)
222{
223 struct adfs_inode_info *ei;
224 ei = kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
225 if (!ei)
226 return NULL;
227 return &ei->vfs_inode;
228}
229
230static void adfs_free_inode(struct inode *inode)
231{
232 kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
233}
234
235static int adfs_drop_inode(struct inode *inode)
236{
237 /* always drop inodes if we are read-only */
238 return !IS_ENABLED(CONFIG_ADFS_FS_RW) || IS_RDONLY(inode);
239}
240
241static void init_once(void *foo)
242{
243 struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
244
245 inode_init_once(&ei->vfs_inode);
246}
247
248static int __init init_inodecache(void)
249{
250 adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
251 sizeof(struct adfs_inode_info),
252 0, (SLAB_RECLAIM_ACCOUNT|
253 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
254 init_once);
255 if (adfs_inode_cachep == NULL)
256 return -ENOMEM;
257 return 0;
258}
259
260static void destroy_inodecache(void)
261{
262 /*
263 * Make sure all delayed rcu free inodes are flushed before we
264 * destroy cache.
265 */
266 rcu_barrier();
267 kmem_cache_destroy(adfs_inode_cachep);
268}
269
270static const struct super_operations adfs_sops = {
271 .alloc_inode = adfs_alloc_inode,
272 .free_inode = adfs_free_inode,
273 .drop_inode = adfs_drop_inode,
274 .write_inode = adfs_write_inode,
275 .put_super = adfs_put_super,
276 .statfs = adfs_statfs,
277 .remount_fs = adfs_remount,
278 .show_options = adfs_show_options,
279};
280
281static int adfs_probe(struct super_block *sb, unsigned int offset, int silent,
282 int (*validate)(struct super_block *sb,
283 struct buffer_head *bh,
284 struct adfs_discrecord **bhp))
285{
286 struct adfs_sb_info *asb = ADFS_SB(sb);
287 struct adfs_discrecord *dr;
288 struct buffer_head *bh;
289 unsigned int blocksize = BLOCK_SIZE;
290 int ret, try;
291
292 for (try = 0; try < 2; try++) {
293 /* try to set the requested block size */
294 if (sb->s_blocksize != blocksize &&
295 !sb_set_blocksize(sb, blocksize)) {
296 if (!silent)
297 adfs_msg(sb, KERN_ERR,
298 "error: unsupported blocksize");
299 return -EINVAL;
300 }
301
302 /* read the buffer */
303 bh = sb_bread(sb, offset >> sb->s_blocksize_bits);
304 if (!bh) {
305 adfs_msg(sb, KERN_ERR,
306 "error: unable to read block %u, try %d",
307 offset >> sb->s_blocksize_bits, try);
308 return -EIO;
309 }
310
311 /* validate it */
312 ret = validate(sb, bh, &dr);
313 if (ret) {
314 brelse(bh);
315 return ret;
316 }
317
318 /* does the block size match the filesystem block size? */
319 blocksize = 1 << dr->log2secsize;
320 if (sb->s_blocksize == blocksize) {
321 asb->s_map = adfs_read_map(sb, dr);
322 brelse(bh);
323 return PTR_ERR_OR_ZERO(asb->s_map);
324 }
325
326 brelse(bh);
327 }
328
329 return -EIO;
330}
331
332static int adfs_validate_bblk(struct super_block *sb, struct buffer_head *bh,
333 struct adfs_discrecord **drp)
334{
335 struct adfs_discrecord *dr;
336 unsigned char *b_data;
337
338 b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
339 if (adfs_checkbblk(b_data))
340 return -EILSEQ;
341
342 /* Do some sanity checks on the ADFS disc record */
343 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
344 if (adfs_checkdiscrecord(dr))
345 return -EILSEQ;
346
347 *drp = dr;
348 return 0;
349}
350
351static int adfs_validate_dr0(struct super_block *sb, struct buffer_head *bh,
352 struct adfs_discrecord **drp)
353{
354 struct adfs_discrecord *dr;
355
356 /* Do some sanity checks on the ADFS disc record */
357 dr = (struct adfs_discrecord *)(bh->b_data + 4);
358 if (adfs_checkdiscrecord(dr) || dr->nzones_high || dr->nzones != 1)
359 return -EILSEQ;
360
361 *drp = dr;
362 return 0;
363}
364
365static int adfs_fill_super(struct super_block *sb, void *data, int silent)
366{
367 struct adfs_discrecord *dr;
368 struct object_info root_obj;
369 struct adfs_sb_info *asb;
370 struct inode *root;
371 int ret = -EINVAL;
372
373 sb->s_flags |= ADFS_SB_FLAGS;
374
375 asb = kzalloc(sizeof(*asb), GFP_KERNEL);
376 if (!asb)
377 return -ENOMEM;
378
379 sb->s_fs_info = asb;
380 sb->s_magic = ADFS_SUPER_MAGIC;
381 sb->s_time_gran = 10000000;
382
383 /* set default options */
384 asb->s_uid = GLOBAL_ROOT_UID;
385 asb->s_gid = GLOBAL_ROOT_GID;
386 asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
387 asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
388 asb->s_ftsuffix = 0;
389
390 if (parse_options(sb, asb, data))
391 goto error;
392
393 /* Try to probe the filesystem boot block */
394 ret = adfs_probe(sb, ADFS_DISCRECORD, 1, adfs_validate_bblk);
395 if (ret == -EILSEQ)
396 ret = adfs_probe(sb, 0, silent, adfs_validate_dr0);
397 if (ret == -EILSEQ) {
398 if (!silent)
399 adfs_msg(sb, KERN_ERR,
400 "error: can't find an ADFS filesystem on dev %s.",
401 sb->s_id);
402 ret = -EINVAL;
403 }
404 if (ret)
405 goto error;
406
407 /* set up enough so that we can read an inode */
408 sb->s_op = &adfs_sops;
409
410 dr = adfs_map_discrecord(asb->s_map);
411
412 root_obj.parent_id = root_obj.indaddr = le32_to_cpu(dr->root);
413 root_obj.name_len = 0;
414 /* Set root object date as 01 Jan 1987 00:00:00 */
415 root_obj.loadaddr = 0xfff0003f;
416 root_obj.execaddr = 0xec22c000;
417 root_obj.size = ADFS_NEWDIR_SIZE;
418 root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
419 ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
420
421 /*
422 * If this is a F+ disk with variable length directories,
423 * get the root_size from the disc record.
424 */
425 if (dr->format_version) {
426 root_obj.size = le32_to_cpu(dr->root_size);
427 asb->s_dir = &adfs_fplus_dir_ops;
428 asb->s_namelen = ADFS_FPLUS_NAME_LEN;
429 } else {
430 asb->s_dir = &adfs_f_dir_ops;
431 asb->s_namelen = ADFS_F_NAME_LEN;
432 }
433 /*
434 * ,xyz hex filetype suffix may be added by driver
435 * to files that have valid RISC OS filetype
436 */
437 if (asb->s_ftsuffix)
438 asb->s_namelen += 4;
439
440 sb->s_d_op = &adfs_dentry_operations;
441 root = adfs_iget(sb, &root_obj);
442 sb->s_root = d_make_root(root);
443 if (!sb->s_root) {
444 adfs_free_map(sb);
445 adfs_error(sb, "get root inode failed\n");
446 ret = -EIO;
447 goto error;
448 }
449 return 0;
450
451error:
452 sb->s_fs_info = NULL;
453 kfree(asb);
454 return ret;
455}
456
457static struct dentry *adfs_mount(struct file_system_type *fs_type,
458 int flags, const char *dev_name, void *data)
459{
460 return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
461}
462
463static struct file_system_type adfs_fs_type = {
464 .owner = THIS_MODULE,
465 .name = "adfs",
466 .mount = adfs_mount,
467 .kill_sb = kill_block_super,
468 .fs_flags = FS_REQUIRES_DEV,
469};
470MODULE_ALIAS_FS("adfs");
471
472static int __init init_adfs_fs(void)
473{
474 int err = init_inodecache();
475 if (err)
476 goto out1;
477 err = register_filesystem(&adfs_fs_type);
478 if (err)
479 goto out;
480 return 0;
481out:
482 destroy_inodecache();
483out1:
484 return err;
485}
486
487static void __exit exit_adfs_fs(void)
488{
489 unregister_filesystem(&adfs_fs_type);
490 destroy_inodecache();
491}
492
493module_init(init_adfs_fs)
494module_exit(exit_adfs_fs)
495MODULE_LICENSE("GPL");