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_cmp_cat_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_fill_cat_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_fill_cat_key_uni(hfsplus_btree_key *key, u32 parent,
  43                                      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, hfsplus_perm *perms)
  56 {
  57         perms->mode = cpu_to_be32(inode->i_mode);
  58         perms->owner = cpu_to_be32(inode->i_uid);
  59         perms->group = cpu_to_be32(inode->i_gid);
  60 }
  61
  62 static int hfsplus_fill_cat_entry(hfsplus_cat_entry *entry, u32 cnid, struct inode *inode)
  63 {
  64         if (S_ISDIR(inode->i_mode)) {
  65                 hfsplus_cat_folder *folder;
  66
  67                 folder = &entry->folder;
  68                 memset(folder, 0, sizeof(*folder));
  69                 folder->type = cpu_to_be16(HFSPLUS_FOLDER);
  70                 folder->id = cpu_to_be32(inode->i_ino);
  71                 folder->create_date = folder->content_mod_date =
  72                         folder->attribute_mod_date = folder->access_date =
  73                         hfsp_now2mt();
  74                 hfsplus_set_perms(inode, &folder->permissions);
  75                 if (inode == HFSPLUS_SB(inode->i_sb).hidden_dir)
  76                         /* invisible and namelocked */
  77                         folder->user_info.frFlags = cpu_to_be16(0x5000);
  78                 return sizeof(*folder);
  79         } else {
  80                 hfsplus_cat_file *file;
  81
  82                 file = &entry->file;
  83                 memset(file, 0, sizeof(*file));
  84                 file->type = cpu_to_be16(HFSPLUS_FILE);
  85                 file->id = cpu_to_be32(cnid);
  86                 file->create_date = file->content_mod_date =
  87                         file->attribute_mod_date = file->access_date =
  88                         hfsp_now2mt();
  89                 if (cnid == inode->i_ino) {
  90                         hfsplus_set_perms(inode, &file->permissions);
  91                         file->user_info.fdType = cpu_to_be32(HFSPLUS_SB(inode->i_sb).type);
  92                         file->user_info.fdCreator = cpu_to_be32(HFSPLUS_SB(inode->i_sb).creator);
  93                 } else {
  94                         file->user_info.fdType = cpu_to_be32(HFSP_HARDLINK_TYPE);
  95                         file->user_info.fdCreator = cpu_to_be32(HFSP_HFSPLUS_CREATOR);
  96                         file->user_info.fdFlags = cpu_to_be16(0x100);
  97                         file->permissions.dev = cpu_to_be32(HFSPLUS_I(inode).dev);
  98                 }
  99                 return sizeof(*file);
 100         }
 101 }
 102
 103 static int hfsplus_fill_cat_thread(hfsplus_cat_entry *entry, int type,
 104                                    u32 parentid, struct qstr *str)
 105 {
 106         entry->type = cpu_to_be16(type);
 107         entry->thread.reserved = 0;
 108         entry->thread.parentID = cpu_to_be32(parentid);
 109         hfsplus_asc2uni(&entry->thread.nodeName, str->name, str->len);
 110         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
 111 }
 112
 113 /* Try to get a catalog entry for given catalog id */
 114 int hfsplus_find_cat(struct super_block *sb, unsigned long cnid,
 115                      struct hfsplus_find_data *fd)
 116 {
 117         hfsplus_cat_entry tmp;
 118         int err;
 119         u16 type;
 120
 121         hfsplus_fill_cat_key(fd->search_key, cnid, NULL);
 122         err = hfsplus_btree_find_entry(fd, &tmp, sizeof(hfsplus_cat_entry));
 123         if (err)
 124                 return err;
 125
 126         type = be16_to_cpu(tmp.type);
 127         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
 128                 printk("HFS+-fs: Found bad thread record in catalog\n");
 129                 return -EIO;
 130         }
 131
 132         if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
 133                 printk(KERN_ERR "hfs: catalog name length corrupted\n");
 134                 return -EIO;
 135         }
 136
 137         hfsplus_fill_cat_key_uni(fd->search_key, be32_to_cpu(tmp.thread.parentID),
 138                                  &tmp.thread.nodeName);
 139         return hfsplus_btree_find(fd);
 140 }
 141
 142 int hfsplus_create_cat(u32 cnid, struct inode *dir, struct qstr *str, struct inode *inode)
 143 {
 144         struct hfsplus_find_data fd;
 145         struct super_block *sb;
 146         hfsplus_cat_entry entry;
 147         int entry_size;
 148         int err;
 149
 150         dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n", str->name, cnid, inode->i_nlink);
 151         sb = dir->i_sb;
 152         hfsplus_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 153
 154         hfsplus_fill_cat_key(fd.search_key, cnid, NULL);
 155         entry_size = hfsplus_fill_cat_thread(&entry, S_ISDIR(inode->i_mode) ?
 156                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
 157                         dir->i_ino, str);
 158         err = hfsplus_btree_find(&fd);
 159         if (err != -ENOENT) {
 160                 if (!err)
 161                         err = -EEXIST;
 162                 goto out;
 163         }
 164         err = hfsplus_bnode_insert_rec(&fd, &entry, entry_size);
 165         if (err)
 166                 goto out;
 167
 168         hfsplus_fill_cat_key(fd.search_key, dir->i_ino, str);
 169         entry_size = hfsplus_fill_cat_entry(&entry, cnid, inode);
 170         err = hfsplus_btree_find(&fd);
 171         if (err != -ENOENT) {
 172                 /* panic? */
 173                 if (!err)
 174                         err = -EEXIST;
 175                 goto out;
 176         }
 177         err = hfsplus_bnode_insert_rec(&fd, &entry, entry_size);
 178         if (!err) {
 179                 dir->i_size++;
 180                 mark_inode_dirty(dir);
 181         }
 182 out:
 183         hfsplus_find_exit(&fd);
 184
 185         return err;
 186 }
 187
 188 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
 189 {
 190         struct super_block *sb;
 191         struct hfsplus_find_data fd;
 192         hfsplus_fork_raw fork;
 193         struct list_head *pos;
 194         int err, off;
 195         u16 type;
 196
 197         dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 198         sb = dir->i_sb;
 199         hfsplus_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 200
 201         if (!str) {
 202                 int len;
 203
 204                 hfsplus_fill_cat_key(fd.search_key, cnid, NULL);
 205                 err = hfsplus_btree_find(&fd);
 206                 if (err)
 207                         goto out;
 208
 209                 off = fd.entryoffset + offsetof(hfsplus_cat_thread, nodeName);
 210                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
 211                 hfsplus_bnode_readbytes(fd.bnode, &fd.search_key->cat.name.length, off, 2);
 212                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
 213                 hfsplus_bnode_readbytes(fd.bnode, &fd.search_key->cat.name.unicode, off + 2, len);
 214                 fd.search_key->key_len = cpu_to_be16(6 + len);
 215         } else
 216                 hfsplus_fill_cat_key(fd.search_key, dir->i_ino, str);
 217
 218         err = hfsplus_btree_find(&fd);
 219         if (err)
 220                 goto out;
 221
 222         type = hfsplus_bnode_read_u16(fd.bnode, fd.entryoffset);
 223         if (type == HFSPLUS_FILE) {
 224 #if 0
 225                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
 226                 hfsplus_bnode_readbytes(fd.bnode, &fork, off, sizeof(fork));
 227                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
 228 #endif
 229
 230                 off = fd.entryoffset + offsetof(hfsplus_cat_file, rsrc_fork);
 231                 hfsplus_bnode_readbytes(fd.bnode, &fork, off, sizeof(fork));
 232                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
 233         }
 234
 235         list_for_each(pos, &HFSPLUS_I(dir).open_dir_list) {
 236                 struct hfsplus_readdir_data *rd =
 237                         list_entry(pos, struct hfsplus_readdir_data, list);
 238                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 239                         rd->file->f_pos--;
 240         }
 241
 242         err = hfsplus_bnode_remove_rec(&fd);
 243         if (err)
 244                 goto out;
 245
 246         hfsplus_fill_cat_key(fd.search_key, cnid, NULL);
 247         err = hfsplus_btree_find(&fd);
 248         if (err)
 249                 goto out;
 250
 251         err = hfsplus_bnode_remove_rec(&fd);
 252         if (err)
 253                 goto out;
 254
 255         dir->i_size--;
 256         mark_inode_dirty(dir);
 257 out:
 258         hfsplus_find_exit(&fd);
 259
 260         return err;
 261 }
 262
 263 int hfsplus_rename_cat(u32 cnid,
 264                        struct inode *src_dir, struct qstr *src_name,
 265                        struct inode *dst_dir, struct qstr *dst_name)
 266 {
 267         struct super_block *sb;
 268         struct hfsplus_find_data src_fd, dst_fd;
 269         hfsplus_cat_entry entry;
 270         int entry_size, type;
 271         int err = 0;
 272
 273         dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n", cnid, src_dir->i_ino, src_name->name,
 274                 dst_dir->i_ino, dst_name->name);
 275         sb = src_dir->i_sb;
 276         hfsplus_find_init(HFSPLUS_SB(sb).cat_tree, &src_fd);
 277         dst_fd = src_fd;
 278
 279         /* find the old dir entry and read the data */
 280         hfsplus_fill_cat_key(src_fd.search_key, src_dir->i_ino, src_name);
 281         err = hfsplus_btree_find(&src_fd);
 282         if (err)
 283                 goto out;
 284
 285         hfsplus_bnode_readbytes(src_fd.bnode, &entry, src_fd.entryoffset,
 286                                 src_fd.entrylength);
 287
 288         /* create new dir entry with the data from the old entry */
 289         hfsplus_fill_cat_key(dst_fd.search_key, dst_dir->i_ino, dst_name);
 290         err = hfsplus_btree_find(&dst_fd);
 291         if (err != -ENOENT) {
 292                 if (!err)
 293                         err = -EEXIST;
 294                 goto out;
 295         }
 296
 297         err = hfsplus_bnode_insert_rec(&dst_fd, &entry, src_fd.entrylength);
 298         if (err)
 299                 goto out;
 300         dst_dir->i_size++;
 301         mark_inode_dirty(dst_dir);
 302
 303         /* finally remove the old entry */
 304         hfsplus_fill_cat_key(src_fd.search_key, src_dir->i_ino, src_name);
 305         err = hfsplus_btree_find(&src_fd);
 306         if (err)
 307                 goto out;
 308         err = hfsplus_bnode_remove_rec(&src_fd);
 309         if (err)
 310                 goto out;
 311         src_dir->i_size--;
 312         mark_inode_dirty(src_dir);
 313
 314         /* remove old thread entry */
 315         hfsplus_fill_cat_key(src_fd.search_key, cnid, NULL);
 316         err = hfsplus_btree_find(&src_fd);
 317         if (err)
 318                 goto out;
 319         type = hfsplus_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
 320         err = hfsplus_bnode_remove_rec(&src_fd);
 321         if (err)
 322                 goto out;
 323
 324         /* create new thread entry */
 325         hfsplus_fill_cat_key(dst_fd.search_key, cnid, NULL);
 326         entry_size = hfsplus_fill_cat_thread(&entry, type, dst_dir->i_ino, dst_name);
 327         err = hfsplus_btree_find(&dst_fd);
 328         if (err != -ENOENT) {
 329                 if (!err)
 330                         err = -EEXIST;
 331                 goto out;
 332         }
 333         err = hfsplus_bnode_insert_rec(&dst_fd, &entry, entry_size);
 334 out:
 335         hfsplus_put_bnode(dst_fd.bnode);
 336         hfsplus_find_exit(&src_fd);
 337         return err;
 338 }