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0007 #include <linux/module.h>
0008 #include <linux/init.h>
0009 #include <linux/parser.h>
0010 #include <linux/mount.h>
0011 #include <linux/seq_file.h>
0012 #include <linux/slab.h>
0013 #include <linux/statfs.h>
0014 #include <linux/user_namespace.h>
0015 #include <linux/blkdev.h>
0016 #include "adfs.h"
0017 #include "dir_f.h"
0018 #include "dir_fplus.h"
0019
0020 #define ADFS_SB_FLAGS SB_NOATIME
0021
0022 #define ADFS_DEFAULT_OWNER_MASK S_IRWXU
0023 #define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)
0024
0025 void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...)
0026 {
0027 struct va_format vaf;
0028 va_list args;
0029
0030 va_start(args, fmt);
0031 vaf.fmt = fmt;
0032 vaf.va = &args;
0033
0034 printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %pV\n",
0035 sb->s_id, function ? ": " : "",
0036 function ? function : "", &vaf);
0037
0038 va_end(args);
0039 }
0040
0041 void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...)
0042 {
0043 struct va_format vaf;
0044 va_list args;
0045
0046 va_start(args, fmt);
0047 vaf.fmt = fmt;
0048 vaf.va = &args;
0049 printk("%sADFS-fs (%s): %pV\n", pfx, sb->s_id, &vaf);
0050 va_end(args);
0051 }
0052
0053 static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
0054 {
0055 unsigned int max_idlen;
0056 int i;
0057
0058
0059 if (dr->log2secsize != 8 &&
0060 dr->log2secsize != 9 &&
0061 dr->log2secsize != 10)
0062 return 1;
0063
0064
0065 if (dr->idlen < dr->log2secsize + 3)
0066 return 1;
0067
0068
0069
0070
0071
0072 if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
0073 return 1;
0074
0075
0076
0077
0078
0079
0080 max_idlen = dr->format_version ? 19 : 16;
0081 if (dr->idlen > max_idlen)
0082 return 1;
0083
0084
0085 for (i = 0; i < sizeof(dr->unused52); i++)
0086 if (dr->unused52[i] != 0)
0087 return 1;
0088
0089 return 0;
0090 }
0091
0092 static void adfs_put_super(struct super_block *sb)
0093 {
0094 struct adfs_sb_info *asb = ADFS_SB(sb);
0095
0096 adfs_free_map(sb);
0097 kfree_rcu(asb, rcu);
0098 }
0099
0100 static int adfs_show_options(struct seq_file *seq, struct dentry *root)
0101 {
0102 struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
0103
0104 if (!uid_eq(asb->s_uid, GLOBAL_ROOT_UID))
0105 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, asb->s_uid));
0106 if (!gid_eq(asb->s_gid, GLOBAL_ROOT_GID))
0107 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, asb->s_gid));
0108 if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
0109 seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
0110 if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
0111 seq_printf(seq, ",othmask=%o", asb->s_other_mask);
0112 if (asb->s_ftsuffix != 0)
0113 seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
0114
0115 return 0;
0116 }
0117
0118 enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
0119
0120 static const match_table_t tokens = {
0121 {Opt_uid, "uid=%u"},
0122 {Opt_gid, "gid=%u"},
0123 {Opt_ownmask, "ownmask=%o"},
0124 {Opt_othmask, "othmask=%o"},
0125 {Opt_ftsuffix, "ftsuffix=%u"},
0126 {Opt_err, NULL}
0127 };
0128
0129 static int parse_options(struct super_block *sb, struct adfs_sb_info *asb,
0130 char *options)
0131 {
0132 char *p;
0133 int option;
0134
0135 if (!options)
0136 return 0;
0137
0138 while ((p = strsep(&options, ",")) != NULL) {
0139 substring_t args[MAX_OPT_ARGS];
0140 int token;
0141 if (!*p)
0142 continue;
0143
0144 token = match_token(p, tokens, args);
0145 switch (token) {
0146 case Opt_uid:
0147 if (match_int(args, &option))
0148 return -EINVAL;
0149 asb->s_uid = make_kuid(current_user_ns(), option);
0150 if (!uid_valid(asb->s_uid))
0151 return -EINVAL;
0152 break;
0153 case Opt_gid:
0154 if (match_int(args, &option))
0155 return -EINVAL;
0156 asb->s_gid = make_kgid(current_user_ns(), option);
0157 if (!gid_valid(asb->s_gid))
0158 return -EINVAL;
0159 break;
0160 case Opt_ownmask:
0161 if (match_octal(args, &option))
0162 return -EINVAL;
0163 asb->s_owner_mask = option;
0164 break;
0165 case Opt_othmask:
0166 if (match_octal(args, &option))
0167 return -EINVAL;
0168 asb->s_other_mask = option;
0169 break;
0170 case Opt_ftsuffix:
0171 if (match_int(args, &option))
0172 return -EINVAL;
0173 asb->s_ftsuffix = option;
0174 break;
0175 default:
0176 adfs_msg(sb, KERN_ERR,
0177 "unrecognised mount option \"%s\" or missing value",
0178 p);
0179 return -EINVAL;
0180 }
0181 }
0182 return 0;
0183 }
0184
0185 static int adfs_remount(struct super_block *sb, int *flags, char *data)
0186 {
0187 struct adfs_sb_info temp_asb;
0188 int ret;
0189
0190 sync_filesystem(sb);
0191 *flags |= ADFS_SB_FLAGS;
0192
0193 temp_asb = *ADFS_SB(sb);
0194 ret = parse_options(sb, &temp_asb, data);
0195 if (ret == 0)
0196 *ADFS_SB(sb) = temp_asb;
0197
0198 return ret;
0199 }
0200
0201 static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
0202 {
0203 struct super_block *sb = dentry->d_sb;
0204 struct adfs_sb_info *sbi = ADFS_SB(sb);
0205 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
0206
0207 adfs_map_statfs(sb, buf);
0208
0209 buf->f_type = ADFS_SUPER_MAGIC;
0210 buf->f_namelen = sbi->s_namelen;
0211 buf->f_bsize = sb->s_blocksize;
0212 buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
0213 buf->f_fsid = u64_to_fsid(id);
0214
0215 return 0;
0216 }
0217
0218 static struct kmem_cache *adfs_inode_cachep;
0219
0220 static struct inode *adfs_alloc_inode(struct super_block *sb)
0221 {
0222 struct adfs_inode_info *ei;
0223 ei = alloc_inode_sb(sb, adfs_inode_cachep, GFP_KERNEL);
0224 if (!ei)
0225 return NULL;
0226 return &ei->vfs_inode;
0227 }
0228
0229 static void adfs_free_inode(struct inode *inode)
0230 {
0231 kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
0232 }
0233
0234 static int adfs_drop_inode(struct inode *inode)
0235 {
0236
0237 return !IS_ENABLED(CONFIG_ADFS_FS_RW) || IS_RDONLY(inode);
0238 }
0239
0240 static void init_once(void *foo)
0241 {
0242 struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
0243
0244 inode_init_once(&ei->vfs_inode);
0245 }
0246
0247 static int __init init_inodecache(void)
0248 {
0249 adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
0250 sizeof(struct adfs_inode_info),
0251 0, (SLAB_RECLAIM_ACCOUNT|
0252 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
0253 init_once);
0254 if (adfs_inode_cachep == NULL)
0255 return -ENOMEM;
0256 return 0;
0257 }
0258
0259 static void destroy_inodecache(void)
0260 {
0261
0262
0263
0264
0265 rcu_barrier();
0266 kmem_cache_destroy(adfs_inode_cachep);
0267 }
0268
0269 static const struct super_operations adfs_sops = {
0270 .alloc_inode = adfs_alloc_inode,
0271 .free_inode = adfs_free_inode,
0272 .drop_inode = adfs_drop_inode,
0273 .write_inode = adfs_write_inode,
0274 .put_super = adfs_put_super,
0275 .statfs = adfs_statfs,
0276 .remount_fs = adfs_remount,
0277 .show_options = adfs_show_options,
0278 };
0279
0280 static int adfs_probe(struct super_block *sb, unsigned int offset, int silent,
0281 int (*validate)(struct super_block *sb,
0282 struct buffer_head *bh,
0283 struct adfs_discrecord **bhp))
0284 {
0285 struct adfs_sb_info *asb = ADFS_SB(sb);
0286 struct adfs_discrecord *dr;
0287 struct buffer_head *bh;
0288 unsigned int blocksize = BLOCK_SIZE;
0289 int ret, try;
0290
0291 for (try = 0; try < 2; try++) {
0292
0293 if (sb->s_blocksize != blocksize &&
0294 !sb_set_blocksize(sb, blocksize)) {
0295 if (!silent)
0296 adfs_msg(sb, KERN_ERR,
0297 "error: unsupported blocksize");
0298 return -EINVAL;
0299 }
0300
0301
0302 bh = sb_bread(sb, offset >> sb->s_blocksize_bits);
0303 if (!bh) {
0304 adfs_msg(sb, KERN_ERR,
0305 "error: unable to read block %u, try %d",
0306 offset >> sb->s_blocksize_bits, try);
0307 return -EIO;
0308 }
0309
0310
0311 ret = validate(sb, bh, &dr);
0312 if (ret) {
0313 brelse(bh);
0314 return ret;
0315 }
0316
0317
0318 blocksize = 1 << dr->log2secsize;
0319 if (sb->s_blocksize == blocksize) {
0320 asb->s_map = adfs_read_map(sb, dr);
0321 brelse(bh);
0322 return PTR_ERR_OR_ZERO(asb->s_map);
0323 }
0324
0325 brelse(bh);
0326 }
0327
0328 return -EIO;
0329 }
0330
0331 static int adfs_validate_bblk(struct super_block *sb, struct buffer_head *bh,
0332 struct adfs_discrecord **drp)
0333 {
0334 struct adfs_discrecord *dr;
0335 unsigned char *b_data;
0336
0337 b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
0338 if (adfs_checkbblk(b_data))
0339 return -EILSEQ;
0340
0341
0342 dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
0343 if (adfs_checkdiscrecord(dr))
0344 return -EILSEQ;
0345
0346 *drp = dr;
0347 return 0;
0348 }
0349
0350 static int adfs_validate_dr0(struct super_block *sb, struct buffer_head *bh,
0351 struct adfs_discrecord **drp)
0352 {
0353 struct adfs_discrecord *dr;
0354
0355
0356 dr = (struct adfs_discrecord *)(bh->b_data + 4);
0357 if (adfs_checkdiscrecord(dr) || dr->nzones_high || dr->nzones != 1)
0358 return -EILSEQ;
0359
0360 *drp = dr;
0361 return 0;
0362 }
0363
0364 static int adfs_fill_super(struct super_block *sb, void *data, int silent)
0365 {
0366 struct adfs_discrecord *dr;
0367 struct object_info root_obj;
0368 struct adfs_sb_info *asb;
0369 struct inode *root;
0370 int ret = -EINVAL;
0371
0372 sb->s_flags |= ADFS_SB_FLAGS;
0373
0374 asb = kzalloc(sizeof(*asb), GFP_KERNEL);
0375 if (!asb)
0376 return -ENOMEM;
0377
0378 sb->s_fs_info = asb;
0379 sb->s_magic = ADFS_SUPER_MAGIC;
0380 sb->s_time_gran = 10000000;
0381
0382
0383 asb->s_uid = GLOBAL_ROOT_UID;
0384 asb->s_gid = GLOBAL_ROOT_GID;
0385 asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
0386 asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
0387 asb->s_ftsuffix = 0;
0388
0389 if (parse_options(sb, asb, data))
0390 goto error;
0391
0392
0393 ret = adfs_probe(sb, ADFS_DISCRECORD, 1, adfs_validate_bblk);
0394 if (ret == -EILSEQ)
0395 ret = adfs_probe(sb, 0, silent, adfs_validate_dr0);
0396 if (ret == -EILSEQ) {
0397 if (!silent)
0398 adfs_msg(sb, KERN_ERR,
0399 "error: can't find an ADFS filesystem on dev %s.",
0400 sb->s_id);
0401 ret = -EINVAL;
0402 }
0403 if (ret)
0404 goto error;
0405
0406
0407 sb->s_op = &adfs_sops;
0408
0409 dr = adfs_map_discrecord(asb->s_map);
0410
0411 root_obj.parent_id = root_obj.indaddr = le32_to_cpu(dr->root);
0412 root_obj.name_len = 0;
0413
0414 root_obj.loadaddr = 0xfff0003f;
0415 root_obj.execaddr = 0xec22c000;
0416 root_obj.size = ADFS_NEWDIR_SIZE;
0417 root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
0418 ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
0419
0420
0421
0422
0423
0424 if (dr->format_version) {
0425 root_obj.size = le32_to_cpu(dr->root_size);
0426 asb->s_dir = &adfs_fplus_dir_ops;
0427 asb->s_namelen = ADFS_FPLUS_NAME_LEN;
0428 } else {
0429 asb->s_dir = &adfs_f_dir_ops;
0430 asb->s_namelen = ADFS_F_NAME_LEN;
0431 }
0432
0433
0434
0435
0436 if (asb->s_ftsuffix)
0437 asb->s_namelen += 4;
0438
0439 sb->s_d_op = &adfs_dentry_operations;
0440 root = adfs_iget(sb, &root_obj);
0441 sb->s_root = d_make_root(root);
0442 if (!sb->s_root) {
0443 adfs_free_map(sb);
0444 adfs_error(sb, "get root inode failed\n");
0445 ret = -EIO;
0446 goto error;
0447 }
0448 return 0;
0449
0450 error:
0451 sb->s_fs_info = NULL;
0452 kfree(asb);
0453 return ret;
0454 }
0455
0456 static struct dentry *adfs_mount(struct file_system_type *fs_type,
0457 int flags, const char *dev_name, void *data)
0458 {
0459 return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
0460 }
0461
0462 static struct file_system_type adfs_fs_type = {
0463 .owner = THIS_MODULE,
0464 .name = "adfs",
0465 .mount = adfs_mount,
0466 .kill_sb = kill_block_super,
0467 .fs_flags = FS_REQUIRES_DEV,
0468 };
0469 MODULE_ALIAS_FS("adfs");
0470
0471 static int __init init_adfs_fs(void)
0472 {
0473 int err = init_inodecache();
0474 if (err)
0475 goto out1;
0476 err = register_filesystem(&adfs_fs_type);
0477 if (err)
0478 goto out;
0479 return 0;
0480 out:
0481 destroy_inodecache();
0482 out1:
0483 return err;
0484 }
0485
0486 static void __exit exit_adfs_fs(void)
0487 {
0488 unregister_filesystem(&adfs_fs_type);
0489 destroy_inodecache();
0490 }
0491
0492 module_init(init_adfs_fs)
0493 module_exit(exit_adfs_fs)
0494 MODULE_LICENSE("GPL");