fs/hfsplus/dir.c

   1 /*
   2  *  linux/fs/hfsplus/dir.c
   3  *
   4  * Copyright (C) 2001
   5  * Brad Boyer (flar@allandria.com)
   6  * (C) 2003 Ardis Technologies <roman@ardistech.com>
   7  *
   8  * Handling of directories
   9  */
  10
  11 #include <linux/errno.h>
  12 #include <linux/fs.h>
  13 #include <linux/sched.h>
  14 #include <linux/slab.h>
  15 #include <linux/random.h>
  16 #include <linux/version.h>
  17
  18 #include "hfsplus_fs.h"
  19 #include "hfsplus_raw.h"
  20
  21 /* Find the entry inside dir named dentry->d_name */
  22 static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
  23                                      struct nameidata *nd)
  24 {
  25         struct inode *inode = NULL;
  26         struct hfs_find_data fd;
  27         struct super_block *sb;
  28         hfsplus_cat_entry entry;
  29         int err;
  30         u32 cnid, linkid = 0;
  31         u16 type;
  32
  33         sb = dir->i_sb;
  34         dentry->d_fsdata = NULL;
  35         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
  36         hfsplus_cat_build_key(fd.search_key, dir->i_ino, &dentry->d_name);
  37 again:
  38         err = hfs_brec_read(&fd, &entry, sizeof(entry));
  39         if (err) {
  40                 if (err == -ENOENT) {
  41                         hfs_find_exit(&fd);
  42                         /* No such entry */
  43                         inode = NULL;
  44                         goto out;
  45                 }
  46                 goto fail;
  47         }
  48         type = be16_to_cpu(entry.type);
  49         if (type == HFSPLUS_FOLDER) {
  50                 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
  51                         err = -EIO;
  52                         goto fail;
  53                 }
  54                 cnid = be32_to_cpu(entry.folder.id);
  55         } else if (type == HFSPLUS_FILE) {
  56                 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
  57                         err = -EIO;
  58                         goto fail;
  59                 }
  60                 cnid = be32_to_cpu(entry.file.id);
  61                 if (entry.file.user_info.fdType == cpu_to_be32(HFSP_HARDLINK_TYPE) &&
  62                     entry.file.user_info.fdCreator == cpu_to_be32(HFSP_HFSPLUS_CREATOR)) {
  63                         struct qstr str;
  64                         char name[32];
  65
  66                         if (dentry->d_fsdata) {
  67                                 err = -ENOENT;
  68                                 inode = NULL;
  69                                 goto out;
  70                         }
  71                         dentry->d_fsdata = (void *)(unsigned long)cnid;
  72                         linkid = be32_to_cpu(entry.file.permissions.dev);
  73                         str.len = sprintf(name, "iNode%d", linkid);
  74                         str.name = name;
  75                         hfsplus_cat_build_key(fd.search_key, HFSPLUS_SB(sb).hidden_dir->i_ino, &str);
  76                         goto again;
  77                 } else if (!dentry->d_fsdata)
  78                         dentry->d_fsdata = (void *)(unsigned long)cnid;
  79         } else {
  80                 printk("HFS+-fs: Illegal catalog entry type in lookup\n");
  81                 err = -EIO;
  82                 goto fail;
  83         }
  84         hfs_find_exit(&fd);
  85         inode = iget(dir->i_sb, cnid);
  86         if (!inode)
  87                 return ERR_PTR(-EACCES);
  88         if (S_ISREG(inode->i_mode))
  89                 HFSPLUS_I(inode).dev = linkid;
  90 out:
  91         d_add(dentry, inode);
  92         return NULL;
  93 fail:
  94         hfs_find_exit(&fd);
  95         return ERR_PTR(err);
  96 }
  97
  98 static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir)
  99 {
 100         struct inode *inode = filp->f_dentry->d_inode;
 101         struct super_block *sb = inode->i_sb;
 102         int len, err;
 103         char strbuf[HFSPLUS_MAX_STRLEN + 1];
 104         hfsplus_cat_entry entry;
 105         struct hfs_find_data fd;
 106         struct hfsplus_readdir_data *rd;
 107         u16 type;
 108
 109         if (filp->f_pos >= inode->i_size)
 110                 return 0;
 111
 112         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 113         hfsplus_cat_build_key(fd.search_key, inode->i_ino, NULL);
 114         err = hfs_brec_find(&fd);
 115         if (err)
 116                 goto out;
 117
 118         switch ((u32)filp->f_pos) {
 119         case 0:
 120                 /* This is completely artificial... */
 121                 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
 122                         goto out;
 123                 filp->f_pos++;
 124                 /* fall through */
 125         case 1:
 126                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
 127                 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
 128                         printk("HFS+-fs: bad catalog folder thread\n");
 129                         err = -EIO;
 130                         goto out;
 131                 }
 132                 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
 133                         printk("HFS+-fs: truncated catalog thread\n");
 134                         err = -EIO;
 135                         goto out;
 136                 }
 137                 if (filldir(dirent, "..", 2, 1,
 138                             be32_to_cpu(entry.thread.parentID), DT_DIR))
 139                         goto out;
 140                 filp->f_pos++;
 141                 /* fall through */
 142         default:
 143                 if (filp->f_pos >= inode->i_size)
 144                         goto out;
 145                 err = hfs_brec_goto(&fd, filp->f_pos - 1);
 146                 if (err)
 147                         goto out;
 148         }
 149
 150         for (;;) {
 151                 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
 152                         printk("HFS+-fs: walked past end of dir\n");
 153                         err = -EIO;
 154                         goto out;
 155                 }
 156                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
 157                 type = be16_to_cpu(entry.type);
 158                 len = HFSPLUS_MAX_STRLEN;
 159                 err = hfsplus_uni2asc(&fd.key->cat.name, strbuf, &len);
 160                 if (err)
 161                         goto out;
 162                 if (type == HFSPLUS_FOLDER) {
 163                         if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
 164                                 printk("HFS+-fs: small dir entry\n");
 165                                 err = -EIO;
 166                                 goto out;
 167                         }
 168                         if (HFSPLUS_SB(sb).hidden_dir &&
 169                             HFSPLUS_SB(sb).hidden_dir->i_ino == be32_to_cpu(entry.folder.id))
 170                                 goto next;
 171                         if (filldir(dirent, strbuf, len, filp->f_pos,
 172                                     be32_to_cpu(entry.folder.id), DT_DIR))
 173                                 break;
 174                 } else if (type == HFSPLUS_FILE) {
 175                         if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
 176                                 printk("HFS+-fs: small file entry\n");
 177                                 err = -EIO;
 178                                 goto out;
 179                         }
 180                         if (filldir(dirent, strbuf, len, filp->f_pos,
 181                                     be32_to_cpu(entry.file.id), DT_REG))
 182                                 break;
 183                 } else {
 184                         printk("HFS+-fs: bad catalog entry type\n");
 185                         err = -EIO;
 186                         goto out;
 187                 }
 188         next:
 189                 filp->f_pos++;
 190                 if (filp->f_pos >= inode->i_size)
 191                         goto out;
 192                 err = hfs_brec_goto(&fd, 1);
 193                 if (err)
 194                         goto out;
 195         }
 196         rd = filp->private_data;
 197         if (!rd) {
 198                 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
 199                 if (!rd) {
 200                         err = -ENOMEM;
 201                         goto out;
 202                 }
 203                 filp->private_data = rd;
 204                 rd->file = filp;
 205                 list_add(&rd->list, &HFSPLUS_I(inode).open_dir_list);
 206         }
 207         memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
 208 out:
 209         hfs_find_exit(&fd);
 210         return err;
 211 }
 212
 213 static int hfsplus_dir_release(struct inode *inode, struct file *file)
 214 {
 215         struct hfsplus_readdir_data *rd = file->private_data;
 216         if (rd) {
 217                 list_del(&rd->list);
 218                 kfree(rd);
 219         }
 220         return 0;
 221 }
 222
 223 int hfsplus_create(struct inode *dir, struct dentry *dentry, int mode,
 224                    struct nameidata *nd)
 225 {
 226         struct inode *inode;
 227         int res;
 228
 229         inode = hfsplus_new_inode(dir->i_sb, mode);
 230         if (!inode)
 231                 return -ENOSPC;
 232
 233         res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
 234         if (res) {
 235                 inode->i_nlink = 0;
 236                 iput(inode);
 237                 return res;
 238         }
 239         dentry->d_fsdata = (void *)inode->i_ino;
 240         d_instantiate(dentry, inode);
 241         mark_inode_dirty(inode);
 242         return 0;
 243 }
 244
 245 int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, struct dentry *dst_dentry)
 246 {
 247         struct super_block *sb = dst_dir->i_sb;
 248         struct inode *inode = src_dentry->d_inode;
 249         struct inode *src_dir = src_dentry->d_parent->d_inode;
 250         struct qstr str;
 251         char name[32];
 252         u32 cnid, id;
 253         int res;
 254
 255         if (HFSPLUS_IS_RSRC(inode))
 256                 return -EPERM;
 257
 258         if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
 259                 for (;;) {
 260                         get_random_bytes(&id, sizeof(cnid));
 261                         id &= 0x3fffffff;
 262                         str.name = name;
 263                         str.len = sprintf(name, "iNode%d", id);
 264                         res = hfsplus_rename_cat(inode->i_ino,
 265                                                  src_dir, &src_dentry->d_name,
 266                                                  HFSPLUS_SB(sb).hidden_dir, &str);
 267                         if (!res)
 268                                 break;
 269                         if (res != -EEXIST)
 270                                 return res;
 271                 }
 272                 HFSPLUS_I(inode).dev = id;
 273                 cnid = HFSPLUS_SB(sb).next_cnid++;
 274                 src_dentry->d_fsdata = (void *)(unsigned long)cnid;
 275                 res = hfsplus_create_cat(cnid, src_dir, &src_dentry->d_name, inode);
 276                 if (res)
 277                         /* panic? */
 278                         return res;
 279                 HFSPLUS_SB(sb).file_count++;
 280         }
 281         cnid = HFSPLUS_SB(sb).next_cnid++;
 282         res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
 283         if (res)
 284                 return res;
 285
 286         inode->i_nlink++;
 287         dst_dentry->d_fsdata = (void *)(unsigned long)cnid;
 288         d_instantiate(dst_dentry, inode);
 289         atomic_inc(&inode->i_count);
 290         inode->i_ctime = CURRENT_TIME;
 291         mark_inode_dirty(inode);
 292         HFSPLUS_SB(sb).file_count++;
 293         sb->s_dirt = 1;
 294
 295         return 0;
 296 }
 297
 298 int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
 299 {
 300         struct super_block *sb = dir->i_sb;
 301         struct inode *inode = dentry->d_inode;
 302         struct qstr str;
 303         char name[32];
 304         u32 cnid;
 305         int res;
 306
 307         if (HFSPLUS_IS_RSRC(inode))
 308                 return -EPERM;
 309
 310         cnid = (u32)(unsigned long)dentry->d_fsdata;
 311         if (inode->i_ino == cnid &&
 312             atomic_read(&HFSPLUS_I(inode).opencnt)) {
 313                 str.name = name;
 314                 str.len = sprintf(name, "temp%lu", inode->i_ino);
 315                 res = hfsplus_rename_cat(inode->i_ino,
 316                                          dir, &dentry->d_name,
 317                                          HFSPLUS_SB(sb).hidden_dir, &str);
 318                 if (!res)
 319                         inode->i_flags |= S_DEAD;
 320                 return res;
 321         }
 322         res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
 323         if (res)
 324                 return res;
 325
 326         inode->i_nlink--;
 327         hfsplus_delete_inode(inode);
 328         if (inode->i_ino != cnid && !inode->i_nlink) {
 329                 if (!atomic_read(&HFSPLUS_I(inode).opencnt)) {
 330                         res = hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
 331                         if (!res)
 332                                 hfsplus_delete_inode(inode);
 333                 } else
 334                         inode->i_flags |= S_DEAD;
 335         }
 336         inode->i_ctime = CURRENT_TIME;
 337         mark_inode_dirty(inode);
 338
 339         return res;
 340 }
 341
 342 int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 343 {
 344         struct inode *inode;
 345         int res;
 346
 347         inode = hfsplus_new_inode(dir->i_sb, S_IFDIR | mode);
 348         if (!inode)
 349                 return -ENOSPC;
 350
 351         res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
 352         if (res) {
 353                 inode->i_nlink = 0;
 354                 iput(inode);
 355                 return res;
 356         }
 357         d_instantiate(dentry, inode);
 358         mark_inode_dirty(inode);
 359         return 0;
 360 }
 361
 362 int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
 363 {
 364         struct inode *inode;
 365         int res;
 366
 367         inode = dentry->d_inode;
 368         if (inode->i_size != 2)
 369                 return -ENOTEMPTY;
 370         res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
 371         if (res)
 372                 return res;
 373         inode->i_nlink = 0;
 374         inode->i_ctime = CURRENT_TIME;
 375         hfsplus_delete_inode(inode);
 376         mark_inode_dirty(inode);
 377         return 0;
 378 }
 379
 380 int hfsplus_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
 381 {
 382         struct super_block *sb;
 383         struct inode *inode;
 384         int res;
 385
 386         sb = dir->i_sb;
 387         inode = hfsplus_new_inode(sb, S_IFLNK | S_IRWXUGO);
 388         if (!inode)
 389                 return -ENOSPC;
 390
 391         res = page_symlink(inode, symname, strlen(symname) + 1);
 392         if (res) {
 393                 inode->i_nlink = 0;
 394                 iput (inode);
 395                 return res;
 396         }
 397
 398         mark_inode_dirty(inode);
 399         res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
 400
 401         if (!res) {
 402                 dentry->d_fsdata = (void *)inode->i_ino;
 403                 d_instantiate(dentry, inode);
 404                 mark_inode_dirty(inode);
 405         }
 406
 407         return res;
 408 }
 409
 410 int hfsplus_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 411 {
 412         struct super_block *sb;
 413         struct inode *inode;
 414         int res;
 415
 416         sb = dir->i_sb;
 417         inode = hfsplus_new_inode(sb, mode);
 418         if (!inode)
 419                 return -ENOSPC;
 420
 421         res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
 422         if (res) {
 423                 inode->i_nlink = 0;
 424                 iput(inode);
 425                 return res;
 426         }
 427         init_special_inode(inode, mode, rdev);
 428         dentry->d_fsdata = (void *)inode->i_ino;
 429         d_instantiate(dentry, inode);
 430         mark_inode_dirty(inode);
 431
 432         return 0;
 433 }
 434
 435 int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
 436                    struct inode *new_dir, struct dentry *new_dentry)
 437 {
 438         int res;
 439
 440         /* Unlink destination if it already exists */
 441         if (new_dentry->d_inode) {
 442                 res = hfsplus_unlink(new_dir, new_dentry);
 443                 if (res)
 444                         return res;
 445         }
 446
 447         res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
 448                                  old_dir, &old_dentry->d_name,
 449                                  new_dir, &new_dentry->d_name);
 450         if (!res)
 451                 new_dentry->d_fsdata = old_dentry->d_fsdata;
 452         return res;
 453 }
 454
 455 struct inode_operations hfsplus_dir_inode_operations = {
 456         .lookup         = hfsplus_lookup,
 457         .create         = hfsplus_create,
 458         .link           = hfsplus_link,
 459         .unlink         = hfsplus_unlink,
 460         .mkdir          = hfsplus_mkdir,
 461         .rmdir          = hfsplus_rmdir,
 462         .symlink        = hfsplus_symlink,
 463         .mknod          = hfsplus_mknod,
 464         .rename         = hfsplus_rename,
 465 };
 466
 467 struct file_operations hfsplus_dir_operations = {
 468         .read           = generic_read_dir,
 469         .readdir        = hfsplus_readdir,
 470         .ioctl          = hfsplus_ioctl,
 471         .llseek         = generic_file_llseek,
 472         .release        = hfsplus_dir_release,
 473 };