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