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   1 /*
   2  *  linux/fs/hfsplus/catalog.c
   3  *
   4  * Copyright (C) 2001
   5  * Brad Boyer (flar@allandria.com)
   6  * (C) 2003 Ardis Technologies <roman@ardistech.com>
   7  *
   8  * Handling of catalog records
   9  */
  10
  11 #include <linux/sched.h>
  12
  13 #include "hfsplus_fs.h"
  14 #include "hfsplus_raw.h"
  15
  16 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
  17                              const hfsplus_btree_key *k2)
  18 {
  19         __be32 k1p, k2p;
  20
  21         k1p = k1->cat.parent;
  22         k2p = k2->cat.parent;
  23         if (k1p != k2p)
  24                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
  25
  26         return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
  27 }
  28
  29 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
  30                             const hfsplus_btree_key *k2)
  31 {
  32         __be32 k1p, k2p;
  33
  34         k1p = k1->cat.parent;
  35         k2p = k2->cat.parent;
  36         if (k1p != k2p)
  37                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
  38
  39         return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
  40 }
  41
  42 void hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
  43                            u32 parent, struct qstr *str)
  44 {
  45         int len;
  46
  47         key->cat.parent = cpu_to_be32(parent);
  48         if (str) {
  49                 hfsplus_asc2uni(sb, &key->cat.name, str->name, str->len);
  50                 len = be16_to_cpu(key->cat.name.length);
  51         } else {
  52                 key->cat.name.length = 0;
  53                 len = 0;
  54         }
  55         key->key_len = cpu_to_be16(6 + 2 * len);
  56 }
  57
  58 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
  59                                       struct hfsplus_unistr *name)
  60 {
  61         int ustrlen;
  62
  63         ustrlen = be16_to_cpu(name->length);
  64         key->cat.parent = cpu_to_be32(parent);
  65         key->cat.name.length = cpu_to_be16(ustrlen);
  66         ustrlen *= 2;
  67         memcpy(key->cat.name.unicode, name->unicode, ustrlen);
  68         key->key_len = cpu_to_be16(6 + ustrlen);
  69 }
  70
  71 static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
  72 {
  73         if (inode->i_flags & S_IMMUTABLE)
  74                 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
  75         else
  76                 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
  77         if (inode->i_flags & S_APPEND)
  78                 perms->rootflags |= HFSPLUS_FLG_APPEND;
  79         else
  80                 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
  81         HFSPLUS_I(inode).rootflags = perms->rootflags;
  82         HFSPLUS_I(inode).userflags = perms->userflags;
  83         perms->mode = cpu_to_be16(inode->i_mode);
  84         perms->owner = cpu_to_be32(inode->i_uid);
  85         perms->group = cpu_to_be32(inode->i_gid);
  86 }
  87
  88 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry, u32 cnid, struct inode *inode)
  89 {
  90         if (S_ISDIR(inode->i_mode)) {
  91                 struct hfsplus_cat_folder *folder;
  92
  93                 folder = &entry->folder;
  94                 memset(folder, 0, sizeof(*folder));
  95                 folder->type = cpu_to_be16(HFSPLUS_FOLDER);
  96                 folder->id = cpu_to_be32(inode->i_ino);
  97                 folder->create_date = folder->content_mod_date =
  98                         folder->attribute_mod_date = folder->access_date = hfsp_now2mt();
  99                 hfsplus_set_perms(inode, &folder->permissions);
 100                 if (inode == HFSPLUS_SB(inode->i_sb).hidden_dir)
 101                         /* invisible and namelocked */
 102                         folder->user_info.frFlags = cpu_to_be16(0x5000);
 103                 return sizeof(*folder);
 104         } else {
 105                 struct hfsplus_cat_file *file;
 106
 107                 file = &entry->file;
 108                 memset(file, 0, sizeof(*file));
 109                 file->type = cpu_to_be16(HFSPLUS_FILE);
 110                 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
 111                 file->id = cpu_to_be32(cnid);
 112                 file->create_date = file->content_mod_date =
 113                         file->attribute_mod_date = file->access_date = hfsp_now2mt();
 114                 if (cnid == inode->i_ino) {
 115                         hfsplus_set_perms(inode, &file->permissions);
 116                         file->user_info.fdType = cpu_to_be32(HFSPLUS_SB(inode->i_sb).type);
 117                         file->user_info.fdCreator = cpu_to_be32(HFSPLUS_SB(inode->i_sb).creator);
 118                         if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
 119                                 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
 120                 } else {
 121                         file->user_info.fdType = cpu_to_be32(HFSP_HARDLINK_TYPE);
 122                         file->user_info.fdCreator = cpu_to_be32(HFSP_HFSPLUS_CREATOR);
 123                         file->user_info.fdFlags = cpu_to_be16(0x100);
 124                         file->permissions.dev = cpu_to_be32(HFSPLUS_I(inode).dev);
 125                 }
 126                 return sizeof(*file);
 127         }
 128 }
 129
 130 static int hfsplus_fill_cat_thread(struct super_block *sb,
 131                                    hfsplus_cat_entry *entry, int type,
 132                                    u32 parentid, struct qstr *str)
 133 {
 134         entry->type = cpu_to_be16(type);
 135         entry->thread.reserved = 0;
 136         entry->thread.parentID = cpu_to_be32(parentid);
 137         hfsplus_asc2uni(sb, &entry->thread.nodeName, str->name, str->len);
 138         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
 139 }
 140
 141 /* Try to get a catalog entry for given catalog id */
 142 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
 143                      struct hfs_find_data *fd)
 144 {
 145         hfsplus_cat_entry tmp;
 146         int err;
 147         u16 type;
 148
 149         hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
 150         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
 151         if (err)
 152                 return err;
 153
 154         type = be16_to_cpu(tmp.type);
 155         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
 156                 printk(KERN_ERR "hfs: found bad thread record in catalog\n");
 157                 return -EIO;
 158         }
 159
 160         hfsplus_cat_build_key_uni(fd->search_key, be32_to_cpu(tmp.thread.parentID),
 161                                  &tmp.thread.nodeName);
 162         return hfs_brec_find(fd);
 163 }
 164
 165 int hfsplus_create_cat(u32 cnid, struct inode *dir, struct qstr *str, struct inode *inode)
 166 {
 167         struct hfs_find_data fd;
 168         struct super_block *sb;
 169         hfsplus_cat_entry entry;
 170         int entry_size;
 171         int err;
 172
 173         dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n", str->name, cnid, inode->i_nlink);
 174         sb = dir->i_sb;
 175         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 176
 177         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 178         entry_size = hfsplus_fill_cat_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
 179                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
 180                         dir->i_ino, str);
 181         err = hfs_brec_find(&fd);
 182         if (err != -ENOENT) {
 183                 if (!err)
 184                         err = -EEXIST;
 185                 goto err2;
 186         }
 187         err = hfs_brec_insert(&fd, &entry, entry_size);
 188         if (err)
 189                 goto err2;
 190
 191         hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 192         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
 193         err = hfs_brec_find(&fd);
 194         if (err != -ENOENT) {
 195                 /* panic? */
 196                 if (!err)
 197                         err = -EEXIST;
 198                 goto err1;
 199         }
 200         err = hfs_brec_insert(&fd, &entry, entry_size);
 201         if (err)
 202                 goto err1;
 203
 204         dir->i_size++;
 205         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 206         mark_inode_dirty(dir);
 207         hfs_find_exit(&fd);
 208         return 0;
 209
 210 err1:
 211         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 212         if (!hfs_brec_find(&fd))
 213                 hfs_brec_remove(&fd);
 214 err2:
 215         hfs_find_exit(&fd);
 216         return err;
 217 }
 218
 219 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
 220 {
 221         struct super_block *sb;
 222         struct hfs_find_data fd;
 223         struct hfsplus_fork_raw fork;
 224         struct list_head *pos;
 225         int err, off;
 226         u16 type;
 227
 228         dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 229         sb = dir->i_sb;
 230         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 231
 232         if (!str) {
 233                 int len;
 234
 235                 hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 236                 err = hfs_brec_find(&fd);
 237                 if (err)
 238                         goto out;
 239
 240                 off = fd.entryoffset + offsetof(struct hfsplus_cat_thread, nodeName);
 241                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
 242                 hfs_bnode_read(fd.bnode, &fd.search_key->cat.name.length, off, 2);
 243                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
 244                 hfs_bnode_read(fd.bnode, &fd.search_key->cat.name.unicode, off + 2, len);
 245                 fd.search_key->key_len = cpu_to_be16(6 + len);
 246         } else
 247                 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 248
 249         err = hfs_brec_find(&fd);
 250         if (err)
 251                 goto out;
 252
 253         type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
 254         if (type == HFSPLUS_FILE) {
 255 #if 0
 256                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
 257                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 258                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
 259 #endif
 260
 261                 off = fd.entryoffset + offsetof(struct hfsplus_cat_file, rsrc_fork);
 262                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 263                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
 264         }
 265
 266         list_for_each(pos, &HFSPLUS_I(dir).open_dir_list) {
 267                 struct hfsplus_readdir_data *rd =
 268                         list_entry(pos, struct hfsplus_readdir_data, list);
 269                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 270                         rd->file->f_pos--;
 271         }
 272
 273         err = hfs_brec_remove(&fd);
 274         if (err)
 275                 goto out;
 276
 277         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 278         err = hfs_brec_find(&fd);
 279         if (err)
 280                 goto out;
 281
 282         err = hfs_brec_remove(&fd);
 283         if (err)
 284                 goto out;
 285
 286         dir->i_size--;
 287         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 288         mark_inode_dirty(dir);
 289 out:
 290         hfs_find_exit(&fd);
 291
 292         return err;
 293 }
 294
 295 int hfsplus_rename_cat(u32 cnid,
 296                        struct inode *src_dir, struct qstr *src_name,
 297                        struct inode *dst_dir, struct qstr *dst_name)
 298 {
 299         struct super_block *sb;
 300         struct hfs_find_data src_fd, dst_fd;
 301         hfsplus_cat_entry entry;
 302         int entry_size, type;
 303         int err = 0;
 304
 305         dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n", cnid, src_dir->i_ino, src_name->name,
 306                 dst_dir->i_ino, dst_name->name);
 307         sb = src_dir->i_sb;
 308         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &src_fd);
 309         dst_fd = src_fd;
 310
 311         /* find the old dir entry and read the data */
 312         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 313         err = hfs_brec_find(&src_fd);
 314         if (err)
 315                 goto out;
 316
 317         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
 318                                 src_fd.entrylength);
 319
 320         /* create new dir entry with the data from the old entry */
 321         hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
 322         err = hfs_brec_find(&dst_fd);
 323         if (err != -ENOENT) {
 324                 if (!err)
 325                         err = -EEXIST;
 326                 goto out;
 327         }
 328
 329         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
 330         if (err)
 331                 goto out;
 332         dst_dir->i_size++;
 333         dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
 334         mark_inode_dirty(dst_dir);
 335
 336         /* finally remove the old entry */
 337         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 338         err = hfs_brec_find(&src_fd);
 339         if (err)
 340                 goto out;
 341         err = hfs_brec_remove(&src_fd);
 342         if (err)
 343                 goto out;
 344         src_dir->i_size--;
 345         src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
 346         mark_inode_dirty(src_dir);
 347
 348         /* remove old thread entry */
 349         hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
 350         err = hfs_brec_find(&src_fd);
 351         if (err)
 352                 goto out;
 353         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
 354         err = hfs_brec_remove(&src_fd);
 355         if (err)
 356                 goto out;
 357
 358         /* create new thread entry */
 359         hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
 360         entry_size = hfsplus_fill_cat_thread(sb, &entry, type, dst_dir->i_ino, dst_name);
 361         err = hfs_brec_find(&dst_fd);
 362         if (err != -ENOENT) {
 363                 if (!err)
 364                         err = -EEXIST;
 365                 goto out;
 366         }
 367         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
 368 out:
 369         hfs_bnode_put(dst_fd.bnode);
 370         hfs_find_exit(&src_fd);
 371         return err;
 372 }