Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/init.h> |
| 12 | #include <linux/buffer_head.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/parser.h> |
Miklos Szeredi | e11400b | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 14 | #include <linux/mount.h> |
| 15 | #include <linux/seq_file.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/slab.h> |
Al Viro | 608ba50 | 2009-06-16 14:52:13 -0400 | [diff] [blame] | 17 | #include <linux/statfs.h> |
Eric W. Biederman | c010d1f | 2012-02-07 15:58:38 -0800 | [diff] [blame] | 18 | #include <linux/user_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include "adfs.h" |
| 20 | #include "dir_f.h" |
| 21 | #include "dir_fplus.h" |
| 22 | |
Miklos Szeredi | e11400b | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 23 | #define ADFS_DEFAULT_OWNER_MASK S_IRWXU |
| 24 | #define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO) |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | void __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 Dobriyan | 4a6e617 | 2006-12-06 20:37:04 -0800 | [diff] [blame] | 32 | vsnprintf(error_buf, sizeof(error_buf), fmt, args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 40 | static 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 | |
| 73 | static 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 | |
| 97 | static 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 | |
| 118 | static 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 Viro | 2d1d9b5 | 2013-10-03 12:37:18 -0400 | [diff] [blame] | 126 | kfree_rcu(asb, rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | } |
| 128 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 129 | static int adfs_show_options(struct seq_file *seq, struct dentry *root) |
Miklos Szeredi | e11400b | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 130 | { |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 131 | struct adfs_sb_info *asb = ADFS_SB(root->d_sb); |
Miklos Szeredi | e11400b | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 132 | |
Eric W. Biederman | c010d1f | 2012-02-07 15:58:38 -0800 | [diff] [blame] | 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)); |
Miklos Szeredi | e11400b | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 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); |
Stuart Swales | da23ef0 | 2011-03-22 16:35:06 -0700 | [diff] [blame] | 141 | if (asb->s_ftsuffix != 0) |
| 142 | seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix); |
Miklos Szeredi | e11400b | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | |
Stuart Swales | da23ef0 | 2011-03-22 16:35:06 -0700 | [diff] [blame] | 147 | enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 149 | static const match_table_t tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | {Opt_uid, "uid=%u"}, |
| 151 | {Opt_gid, "gid=%u"}, |
| 152 | {Opt_ownmask, "ownmask=%o"}, |
| 153 | {Opt_othmask, "othmask=%o"}, |
Stuart Swales | da23ef0 | 2011-03-22 16:35:06 -0700 | [diff] [blame] | 154 | {Opt_ftsuffix, "ftsuffix=%u"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | {Opt_err, NULL} |
| 156 | }; |
| 157 | |
| 158 | static 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. Biederman | c010d1f | 2012-02-07 15:58:38 -0800 | [diff] [blame] | 178 | asb->s_uid = make_kuid(current_user_ns(), option); |
| 179 | if (!uid_valid(asb->s_uid)) |
| 180 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | break; |
| 182 | case Opt_gid: |
| 183 | if (match_int(args, &option)) |
| 184 | return -EINVAL; |
Eric W. Biederman | c010d1f | 2012-02-07 15:58:38 -0800 | [diff] [blame] | 185 | asb->s_gid = make_kgid(current_user_ns(), option); |
| 186 | if (!gid_valid(asb->s_gid)) |
| 187 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stuart Swales | da23ef0 | 2011-03-22 16:35:06 -0700 | [diff] [blame] | 199 | case Opt_ftsuffix: |
| 200 | if (match_int(args, &option)) |
| 201 | return -EINVAL; |
| 202 | asb->s_ftsuffix = option; |
| 203 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 213 | static int adfs_remount(struct super_block *sb, int *flags, char *data) |
| 214 | { |
Theodore Ts'o | 02b9984 | 2014-03-13 10:14:33 -0400 | [diff] [blame] | 215 | sync_filesystem(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | *flags |= MS_NODIRATIME; |
| 217 | return parse_options(sb, data); |
| 218 | } |
| 219 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 220 | static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | { |
Coly Li | accb401 | 2009-04-02 16:59:27 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
| 226 | buf->f_type = ADFS_SUPER_MAGIC; |
Coly Li | accb401 | 2009-04-02 16:59:27 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | buf->f_bavail = |
Coly Li | accb401 | 2009-04-02 16:59:27 -0700 | [diff] [blame] | 232 | buf->f_bfree = adfs_map_free(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks; |
Coly Li | accb401 | 2009-04-02 16:59:27 -0700 | [diff] [blame] | 234 | buf->f_fsid.val[0] = (u32)id; |
| 235 | buf->f_fsid.val[1] = (u32)(id >> 32); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
| 237 | return 0; |
| 238 | } |
| 239 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 240 | static struct kmem_cache *adfs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
| 242 | static struct inode *adfs_alloc_inode(struct super_block *sb) |
| 243 | { |
| 244 | struct adfs_inode_info *ei; |
Firo Yang | d96f184 | 2015-06-30 14:57:52 -0700 | [diff] [blame] | 245 | ei = kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | if (!ei) |
| 247 | return NULL; |
| 248 | return &ei->vfs_inode; |
| 249 | } |
| 250 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 251 | static void adfs_i_callback(struct rcu_head *head) |
| 252 | { |
| 253 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 254 | kmem_cache_free(adfs_inode_cachep, ADFS_I(inode)); |
| 255 | } |
| 256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | static void adfs_destroy_inode(struct inode *inode) |
| 258 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 259 | call_rcu(&inode->i_rcu, adfs_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
| 261 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 262 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | { |
| 264 | struct adfs_inode_info *ei = (struct adfs_inode_info *) foo; |
| 265 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 266 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 268 | |
Fabian Frederick | 894122d | 2014-04-07 15:38:58 -0700 | [diff] [blame] | 269 | static int __init init_inodecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | { |
| 271 | adfs_inode_cachep = kmem_cache_create("adfs_inode_cache", |
| 272 | sizeof(struct adfs_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 273 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 274 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 275 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | if (adfs_inode_cachep == NULL) |
| 277 | return -ENOMEM; |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | static void destroy_inodecache(void) |
| 282 | { |
Kirill A. Shutemov | 8c0a853 | 2012-09-26 11:33:07 +1000 | [diff] [blame] | 283 | /* |
| 284 | * Make sure all delayed rcu free inodes are flushed before we |
| 285 | * destroy cache. |
| 286 | */ |
| 287 | rcu_barrier(); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 288 | kmem_cache_destroy(adfs_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | } |
| 290 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 291 | static const struct super_operations adfs_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
Miklos Szeredi | e11400b | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 298 | .show_options = adfs_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | }; |
| 300 | |
| 301 | static 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 Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 319 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Andrew Morton | 1725cd0 | 2006-08-13 23:24:17 -0700 | [diff] [blame] | 345 | adfs_error(sb, "map corrupted"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | |
| 347 | error_free: |
| 348 | while (--zone >= 0) |
| 349 | brelse(dm[zone].dm_bh); |
| 350 | |
| 351 | kfree(dm); |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 352 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | static 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 | |
| 365 | static 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; |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 373 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
| 375 | sb->s_flags |= MS_NODIRATIME; |
| 376 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 377 | asb = kzalloc(sizeof(*asb), GFP_KERNEL); |
Arnd Bergmann | 4688a06 | 2011-01-22 20:05:05 +0100 | [diff] [blame] | 378 | if (!asb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | return -ENOMEM; |
| 380 | sb->s_fs_info = asb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | /* set default options */ |
Eric W. Biederman | c010d1f | 2012-02-07 15:58:38 -0800 | [diff] [blame] | 383 | asb->s_uid = GLOBAL_ROOT_UID; |
| 384 | asb->s_gid = GLOBAL_ROOT_GID; |
Miklos Szeredi | e11400b | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 385 | asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK; |
| 386 | asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK; |
Stuart Swales | da23ef0 | 2011-03-22 16:35:06 -0700 | [diff] [blame] | 387 | asb->s_ftsuffix = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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"); |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 395 | ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 405 | ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 418 | ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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."); |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 428 | ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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!"); |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 434 | ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 442 | ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | asb->s_map = adfs_read_map(sb, dr); |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 459 | if (IS_ERR(asb->s_map)) { |
| 460 | ret = PTR_ERR(asb->s_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | goto error_free_bh; |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 462 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stuart Swales | da23ef0 | 2011-03-22 16:35:06 -0700 | [diff] [blame] | 475 | /* Set root object date as 01 Jan 1987 00:00:00 */ |
| 476 | root_obj.loadaddr = 0xfff0003f; |
| 477 | root_obj.execaddr = 0xec22c000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stuart Swales | da23ef0 | 2011-03-22 16:35:06 -0700 | [diff] [blame] | 481 | root_obj.filetype = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Stuart Swales | da23ef0 | 2011-03-22 16:35:06 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
Al Viro | 96e1391 | 2010-12-18 11:20:57 -0500 | [diff] [blame] | 502 | sb->s_d_op = &adfs_dentry_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | root = adfs_iget(sb, &root_obj); |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 504 | sb->s_root = d_make_root(root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | if (!sb->s_root) { |
| 506 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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"); |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 511 | ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | goto error; |
Al Viro | 96e1391 | 2010-12-18 11:20:57 -0500 | [diff] [blame] | 513 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | return 0; |
| 515 | |
| 516 | error_free_bh: |
| 517 | brelse(bh); |
| 518 | error: |
| 519 | sb->s_fs_info = NULL; |
| 520 | kfree(asb); |
Sanidhya Kashyap | b796410 | 2015-04-16 12:48:13 -0700 | [diff] [blame] | 521 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | } |
| 523 | |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 524 | static struct dentry *adfs_mount(struct file_system_type *fs_type, |
| 525 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | { |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 527 | return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | static struct file_system_type adfs_fs_type = { |
| 531 | .owner = THIS_MODULE, |
| 532 | .name = "adfs", |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 533 | .mount = adfs_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | .kill_sb = kill_block_super, |
| 535 | .fs_flags = FS_REQUIRES_DEV, |
| 536 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 537 | MODULE_ALIAS_FS("adfs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
| 539 | static 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; |
| 548 | out: |
| 549 | destroy_inodecache(); |
| 550 | out1: |
| 551 | return err; |
| 552 | } |
| 553 | |
| 554 | static void __exit exit_adfs_fs(void) |
| 555 | { |
| 556 | unregister_filesystem(&adfs_fs_type); |
| 557 | destroy_inodecache(); |
| 558 | } |
| 559 | |
| 560 | module_init(init_adfs_fs) |
| 561 | module_exit(exit_adfs_fs) |
Al Viro | 608ba50 | 2009-06-16 14:52:13 -0400 | [diff] [blame] | 562 | MODULE_LICENSE("GPL"); |