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