blob: e42c3000150900fc76038f80e5c3e5a4a8be4233 [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>
Al Viro608ba502009-06-16 14:52:13 -040017#include <linux/statfs.h>
Eric W. Biedermanc010d1f2012-02-07 15:58:38 -080018#include <linux/user_namespace.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
123 for (i = 0; i < asb->s_map_size; i++)
124 brelse(asb->s_map[i].dm_bh);
125 kfree(asb->s_map);
Al Viro2d1d9b52013-10-03 12:37:18 -0400126 kfree_rcu(asb, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128
Al Viro34c80b12011-12-08 21:32:45 -0500129static int adfs_show_options(struct seq_file *seq, struct dentry *root)
Miklos Szeredie11400b2008-02-08 04:21:35 -0800130{
Al Viro34c80b12011-12-08 21:32:45 -0500131 struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
Miklos Szeredie11400b2008-02-08 04:21:35 -0800132
Eric W. Biedermanc010d1f2012-02-07 15:58:38 -0800133 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));
Miklos Szeredie11400b2008-02-08 04:21:35 -0800137 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);
Stuart Swalesda23ef02011-03-22 16:35:06 -0700141 if (asb->s_ftsuffix != 0)
142 seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
Miklos Szeredie11400b2008-02-08 04:21:35 -0800143
144 return 0;
145}
146
Stuart Swalesda23ef02011-03-22 16:35:06 -0700147enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Steven Whitehousea447c092008-10-13 10:46:57 +0100149static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 {Opt_uid, "uid=%u"},
151 {Opt_gid, "gid=%u"},
152 {Opt_ownmask, "ownmask=%o"},
153 {Opt_othmask, "othmask=%o"},
Stuart Swalesda23ef02011-03-22 16:35:06 -0700154 {Opt_ftsuffix, "ftsuffix=%u"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 {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;
Eric W. Biedermanc010d1f2012-02-07 15:58:38 -0800178 asb->s_uid = make_kuid(current_user_ns(), option);
179 if (!uid_valid(asb->s_uid))
180 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 break;
182 case Opt_gid:
183 if (match_int(args, &option))
184 return -EINVAL;
Eric W. Biedermanc010d1f2012-02-07 15:58:38 -0800185 asb->s_gid = make_kgid(current_user_ns(), option);
186 if (!gid_valid(asb->s_gid))
187 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 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;
Stuart Swalesda23ef02011-03-22 16:35:06 -0700199 case Opt_ftsuffix:
200 if (match_int(args, &option))
201 return -EINVAL;
202 asb->s_ftsuffix = option;
203 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 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{
Theodore Ts'o02b99842014-03-13 10:14:33 -0400215 sync_filesystem(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 *flags |= MS_NODIRATIME;
217 return parse_options(sb, data);
218}
219
David Howells726c3342006-06-23 02:02:58 -0700220static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
Coly Liaccb4012009-04-02 16:59:27 -0700222 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 buf->f_type = ADFS_SUPER_MAGIC;
Coly Liaccb4012009-04-02 16:59:27 -0700227 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 buf->f_bavail =
Coly Liaccb4012009-04-02 16:59:27 -0700232 buf->f_bfree = adfs_map_free(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
Coly Liaccb4012009-04-02 16:59:27 -0700234 buf->f_fsid.val[0] = (u32)id;
235 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 return 0;
238}
239
Christoph Lametere18b8902006-12-06 20:33:20 -0800240static struct kmem_cache *adfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
242static struct inode *adfs_alloc_inode(struct super_block *sb)
243{
244 struct adfs_inode_info *ei;
Firo Yangd96f1842015-06-30 14:57:52 -0700245 ei = kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 if (!ei)
247 return NULL;
248 return &ei->vfs_inode;
249}
250
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100251static void adfs_i_callback(struct rcu_head *head)
252{
253 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100254 kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
255}
256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257static void adfs_destroy_inode(struct inode *inode)
258{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100259 call_rcu(&inode->i_rcu, adfs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260}
261
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700262static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
264 struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
265
Christoph Lametera35afb82007-05-16 22:10:57 -0700266 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267}
Paul Mundt20c2df82007-07-20 10:11:58 +0900268
Fabian Frederick894122d2014-04-07 15:38:58 -0700269static int __init init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270{
271 adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
272 sizeof(struct adfs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800273 0, (SLAB_RECLAIM_ACCOUNT|
Vladimir Davydov5d097052016-01-14 15:18:21 -0800274 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900275 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 if (adfs_inode_cachep == NULL)
277 return -ENOMEM;
278 return 0;
279}
280
281static void destroy_inodecache(void)
282{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000283 /*
284 * Make sure all delayed rcu free inodes are flushed before we
285 * destroy cache.
286 */
287 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700288 kmem_cache_destroy(adfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
290
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800291static const struct super_operations adfs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 .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,
Miklos Szeredie11400b2008-02-08 04:21:35 -0800298 .show_options = adfs_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299};
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");
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700319 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 }
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
Andrew Morton1725cd02006-08-13 23:24:17 -0700345 adfs_error(sb, "map corrupted");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
347error_free:
348 while (--zone >= 0)
349 brelse(dm[zone].dm_bh);
350
351 kfree(dm);
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700352 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353}
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;
Russell King820402d2019-06-04 14:50:14 +0100371 unsigned int blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 struct adfs_sb_info *asb;
373 struct inode *root;
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700374 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
376 sb->s_flags |= MS_NODIRATIME;
377
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700378 asb = kzalloc(sizeof(*asb), GFP_KERNEL);
Arnd Bergmann4688a062011-01-22 20:05:05 +0100379 if (!asb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 return -ENOMEM;
381 sb->s_fs_info = asb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
383 /* set default options */
Eric W. Biedermanc010d1f2012-02-07 15:58:38 -0800384 asb->s_uid = GLOBAL_ROOT_UID;
385 asb->s_gid = GLOBAL_ROOT_GID;
Miklos Szeredie11400b2008-02-08 04:21:35 -0800386 asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
387 asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
Stuart Swalesda23ef02011-03-22 16:35:06 -0700388 asb->s_ftsuffix = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390 if (parse_options(sb, data))
391 goto error;
392
393 sb_set_blocksize(sb, BLOCK_SIZE);
394 if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
395 adfs_error(sb, "unable to read superblock");
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700396 ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 goto error;
398 }
399
400 b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
401
402 if (adfs_checkbblk(b_data)) {
403 if (!silent)
404 printk("VFS: Can't find an adfs filesystem on dev "
405 "%s.\n", sb->s_id);
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700406 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 goto error_free_bh;
408 }
409
410 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
411
412 /*
413 * Do some sanity checks on the ADFS disc record
414 */
415 if (adfs_checkdiscrecord(dr)) {
416 if (!silent)
417 printk("VPS: Can't find an adfs filesystem on dev "
418 "%s.\n", sb->s_id);
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700419 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 goto error_free_bh;
421 }
422
Russell King820402d2019-06-04 14:50:14 +0100423 blocksize = 1 << dr->log2secsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 brelse(bh);
Russell King820402d2019-06-04 14:50:14 +0100425
426 if (sb_set_blocksize(sb, blocksize)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
428 if (!bh) {
429 adfs_error(sb, "couldn't read superblock on "
430 "2nd try.");
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700431 ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 goto error;
433 }
434 b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
435 if (adfs_checkbblk(b_data)) {
436 adfs_error(sb, "disc record mismatch, very weird!");
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700437 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 goto error_free_bh;
439 }
440 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
441 } else {
442 if (!silent)
443 printk(KERN_ERR "VFS: Unsupported blocksize on dev "
444 "%s.\n", sb->s_id);
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700445 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 goto error;
447 }
448
449 /*
450 * blocksize on this device should now be set to the ADFS log2secsize
451 */
452
453 sb->s_magic = ADFS_SUPER_MAGIC;
454 asb->s_idlen = dr->idlen;
455 asb->s_map_size = dr->nzones | (dr->nzones_high << 8);
456 asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
457 asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
458 asb->s_version = dr->format_version;
459 asb->s_log2sharesize = dr->log2sharesize;
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 asb->s_map = adfs_read_map(sb, dr);
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700462 if (IS_ERR(asb->s_map)) {
463 ret = PTR_ERR(asb->s_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 goto error_free_bh;
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700465 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
467 brelse(bh);
468
469 /*
470 * set up enough so that we can read an inode
471 */
472 sb->s_op = &adfs_sops;
473
474 dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
475
476 root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
477 root_obj.name_len = 0;
Stuart Swalesda23ef02011-03-22 16:35:06 -0700478 /* Set root object date as 01 Jan 1987 00:00:00 */
479 root_obj.loadaddr = 0xfff0003f;
480 root_obj.execaddr = 0xec22c000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 root_obj.size = ADFS_NEWDIR_SIZE;
482 root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
483 ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
Stuart Swalesda23ef02011-03-22 16:35:06 -0700484 root_obj.filetype = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 /*
487 * If this is a F+ disk with variable length directories,
488 * get the root_size from the disc record.
489 */
490 if (asb->s_version) {
491 root_obj.size = le32_to_cpu(dr->root_size);
492 asb->s_dir = &adfs_fplus_dir_ops;
493 asb->s_namelen = ADFS_FPLUS_NAME_LEN;
494 } else {
495 asb->s_dir = &adfs_f_dir_ops;
496 asb->s_namelen = ADFS_F_NAME_LEN;
497 }
Stuart Swalesda23ef02011-03-22 16:35:06 -0700498 /*
499 * ,xyz hex filetype suffix may be added by driver
500 * to files that have valid RISC OS filetype
501 */
502 if (asb->s_ftsuffix)
503 asb->s_namelen += 4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
Al Viro96e13912010-12-18 11:20:57 -0500505 sb->s_d_op = &adfs_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 root = adfs_iget(sb, &root_obj);
Al Viro48fde702012-01-08 22:15:13 -0500507 sb->s_root = d_make_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 if (!sb->s_root) {
509 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 for (i = 0; i < asb->s_map_size; i++)
511 brelse(asb->s_map[i].dm_bh);
512 kfree(asb->s_map);
513 adfs_error(sb, "get root inode failed\n");
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700514 ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 goto error;
Al Viro96e13912010-12-18 11:20:57 -0500516 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 return 0;
518
519error_free_bh:
520 brelse(bh);
521error:
522 sb->s_fs_info = NULL;
523 kfree(asb);
Sanidhya Kashyapb7964102015-04-16 12:48:13 -0700524 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525}
526
Al Viro152a0832010-07-25 00:46:55 +0400527static struct dentry *adfs_mount(struct file_system_type *fs_type,
528 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529{
Al Viro152a0832010-07-25 00:46:55 +0400530 return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531}
532
533static struct file_system_type adfs_fs_type = {
534 .owner = THIS_MODULE,
535 .name = "adfs",
Al Viro152a0832010-07-25 00:46:55 +0400536 .mount = adfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 .kill_sb = kill_block_super,
538 .fs_flags = FS_REQUIRES_DEV,
539};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800540MODULE_ALIAS_FS("adfs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542static int __init init_adfs_fs(void)
543{
544 int err = init_inodecache();
545 if (err)
546 goto out1;
547 err = register_filesystem(&adfs_fs_type);
548 if (err)
549 goto out;
550 return 0;
551out:
552 destroy_inodecache();
553out1:
554 return err;
555}
556
557static void __exit exit_adfs_fs(void)
558{
559 unregister_filesystem(&adfs_fs_type);
560 destroy_inodecache();
561}
562
563module_init(init_adfs_fs)
564module_exit(exit_adfs_fs)
Al Viro608ba502009-06-16 14:52:13 -0400565MODULE_LICENSE("GPL");