fs/hfsplus/catalog.c

   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                 HFSPLUS_I(inode).create_date =
  98                         folder->create_date =
  99                         folder->content_mod_date =
 100                         folder->attribute_mod_date =
 101                         folder->access_date = hfsp_now2mt();
 102                 hfsplus_set_perms(inode, &folder->permissions);
 103                 if (inode == HFSPLUS_SB(inode->i_sb).hidden_dir)
 104                         /* invisible and namelocked */
 105                         folder->user_info.frFlags = cpu_to_be16(0x5000);
 106                 return sizeof(*folder);
 107         } else {
 108                 struct hfsplus_cat_file *file;
 109
 110                 file = &entry->file;
 111                 memset(file, 0, sizeof(*file));
 112                 file->type = cpu_to_be16(HFSPLUS_FILE);
 113                 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
 114                 file->id = cpu_to_be32(cnid);
 115                 HFSPLUS_I(inode).create_date =
 116                         file->create_date =
 117                         file->content_mod_date =
 118                         file->attribute_mod_date =
 119                         file->access_date = hfsp_now2mt();
 120                 if (cnid == inode->i_ino) {
 121                         hfsplus_set_perms(inode, &file->permissions);
 122                         file->user_info.fdType = cpu_to_be32(HFSPLUS_SB(inode->i_sb).type);
 123                         file->user_info.fdCreator = cpu_to_be32(HFSPLUS_SB(inode->i_sb).creator);
 124                         if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
 125                                 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
 126                 } else {
 127                         file->user_info.fdType = cpu_to_be32(HFSP_HARDLINK_TYPE);
 128                         file->user_info.fdCreator = cpu_to_be32(HFSP_HFSPLUS_CREATOR);
 129                         file->user_info.fdFlags = cpu_to_be16(0x100);
 130                         file->permissions.dev = cpu_to_be32(HFSPLUS_I(inode).dev);
 131                 }
 132                 return sizeof(*file);
 133         }
 134 }
 135
 136 static int hfsplus_fill_cat_thread(struct super_block *sb,
 137                                    hfsplus_cat_entry *entry, int type,
 138                                    u32 parentid, struct qstr *str)
 139 {
 140         entry->type = cpu_to_be16(type);
 141         entry->thread.reserved = 0;
 142         entry->thread.parentID = cpu_to_be32(parentid);
 143         hfsplus_asc2uni(sb, &entry->thread.nodeName, str->name, str->len);
 144         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
 145 }
 146
 147 /* Try to get a catalog entry for given catalog id */
 148 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
 149                      struct hfs_find_data *fd)
 150 {
 151         hfsplus_cat_entry tmp;
 152         int err;
 153         u16 type;
 154
 155         hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
 156         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
 157         if (err)
 158                 return err;
 159
 160         type = be16_to_cpu(tmp.type);
 161         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
 162                 printk(KERN_ERR "hfs: found bad thread record in catalog\n");
 163                 return -EIO;
 164         }
 165
 166         hfsplus_cat_build_key_uni(fd->search_key, be32_to_cpu(tmp.thread.parentID),
 167                                  &tmp.thread.nodeName);
 168         return hfs_brec_find(fd);
 169 }
 170
 171 int hfsplus_create_cat(u32 cnid, struct inode *dir, struct qstr *str, struct inode *inode)
 172 {
 173         struct hfs_find_data fd;
 174         struct super_block *sb;
 175         hfsplus_cat_entry entry;
 176         int entry_size;
 177         int err;
 178
 179         dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n", str->name, cnid, inode->i_nlink);
 180         sb = dir->i_sb;
 181         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 182
 183         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 184         entry_size = hfsplus_fill_cat_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
 185                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
 186                         dir->i_ino, str);
 187         err = hfs_brec_find(&fd);
 188         if (err != -ENOENT) {
 189                 if (!err)
 190                         err = -EEXIST;
 191                 goto err2;
 192         }
 193         err = hfs_brec_insert(&fd, &entry, entry_size);
 194         if (err)
 195                 goto err2;
 196
 197         hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 198         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
 199         err = hfs_brec_find(&fd);
 200         if (err != -ENOENT) {
 201                 /* panic? */
 202                 if (!err)
 203                         err = -EEXIST;
 204                 goto err1;
 205         }
 206         err = hfs_brec_insert(&fd, &entry, entry_size);
 207         if (err)
 208                 goto err1;
 209
 210         dir->i_size++;
 211         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 212         mark_inode_dirty(dir);
 213         hfs_find_exit(&fd);
 214         return 0;
 215
 216 err1:
 217         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 218         if (!hfs_brec_find(&fd))
 219                 hfs_brec_remove(&fd);
 220 err2:
 221         hfs_find_exit(&fd);
 222         return err;
 223 }
 224
 225 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
 226 {
 227         struct super_block *sb;
 228         struct hfs_find_data fd;
 229         struct hfsplus_fork_raw fork;
 230         struct list_head *pos;
 231         int err, off;
 232         u16 type;
 233
 234         dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 235         sb = dir->i_sb;
 236         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 237
 238         if (!str) {
 239                 int len;
 240
 241                 hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 242                 err = hfs_brec_find(&fd);
 243                 if (err)
 244                         goto out;
 245
 246                 off = fd.entryoffset + offsetof(struct hfsplus_cat_thread, nodeName);
 247                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
 248                 hfs_bnode_read(fd.bnode, &fd.search_key->cat.name.length, off, 2);
 249                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
 250                 hfs_bnode_read(fd.bnode, &fd.search_key->cat.name.unicode, off + 2, len);
 251                 fd.search_key->key_len = cpu_to_be16(6 + len);
 252         } else
 253                 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 254
 255         err = hfs_brec_find(&fd);
 256         if (err)
 257                 goto out;
 258
 259         type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
 260         if (type == HFSPLUS_FILE) {
 261 #if 0
 262                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
 263                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 264                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
 265 #endif
 266
 267                 off = fd.entryoffset + offsetof(struct hfsplus_cat_file, rsrc_fork);
 268                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 269                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
 270         }
 271
 272         list_for_each(pos, &HFSPLUS_I(dir).open_dir_list) {
 273                 struct hfsplus_readdir_data *rd =
 274                         list_entry(pos, struct hfsplus_readdir_data, list);
 275                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 276                         rd->file->f_pos--;
 277         }
 278
 279         err = hfs_brec_remove(&fd);
 280         if (err)
 281                 goto out;
 282
 283         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 284         err = hfs_brec_find(&fd);
 285         if (err)
 286                 goto out;
 287
 288         err = hfs_brec_remove(&fd);
 289         if (err)
 290                 goto out;
 291
 292         dir->i_size--;
 293         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 294         mark_inode_dirty(dir);
 295 out:
 296         hfs_find_exit(&fd);
 297
 298         return err;
 299 }
 300
 301 int hfsplus_rename_cat(u32 cnid,
 302                        struct inode *src_dir, struct qstr *src_name,
 303                        struct inode *dst_dir, struct qstr *dst_name)
 304 {
 305         struct super_block *sb;
 306         struct hfs_find_data src_fd, dst_fd;
 307         hfsplus_cat_entry entry;
 308         int entry_size, type;
 309         int err = 0;
 310
 311         dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n", cnid, src_dir->i_ino, src_name->name,
 312                 dst_dir->i_ino, dst_name->name);
 313         sb = src_dir->i_sb;
 314         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &src_fd);
 315         dst_fd = src_fd;
 316
 317         /* find the old dir entry and read the data */
 318         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 319         err = hfs_brec_find(&src_fd);
 320         if (err)
 321                 goto out;
 322
 323         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
 324                                 src_fd.entrylength);
 325
 326         /* create new dir entry with the data from the old entry */
 327         hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
 328         err = hfs_brec_find(&dst_fd);
 329         if (err != -ENOENT) {
 330                 if (!err)
 331                         err = -EEXIST;
 332                 goto out;
 333         }
 334
 335         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
 336         if (err)
 337                 goto out;
 338         dst_dir->i_size++;
 339         dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
 340         mark_inode_dirty(dst_dir);
 341
 342         /* finally remove the old entry */
 343         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 344         err = hfs_brec_find(&src_fd);
 345         if (err)
 346                 goto out;
 347         err = hfs_brec_remove(&src_fd);
 348         if (err)
 349                 goto out;
 350         src_dir->i_size--;
 351         src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
 352         mark_inode_dirty(src_dir);
 353
 354         /* remove old thread entry */
 355         hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
 356         err = hfs_brec_find(&src_fd);
 357         if (err)
 358                 goto out;
 359         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
 360         err = hfs_brec_remove(&src_fd);
 361         if (err)
 362                 goto out;
 363
 364         /* create new thread entry */
 365         hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
 366         entry_size = hfsplus_fill_cat_thread(sb, &entry, type, dst_dir->i_ino, dst_name);
 367         err = hfs_brec_find(&dst_fd);
 368         if (err != -ENOENT) {
 369                 if (!err)
 370                         err = -EEXIST;
 371                 goto out;
 372         }
 373         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
 374 out:
 375         hfs_bnode_put(dst_fd.bnode);
 376         hfs_find_exit(&src_fd);
 377         return err;
 378 }