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         hfsplus_fill_cat_key_uni(fd->search_key, be32_to_cpu(tmp.thread.parentID),
 133                                  &tmp.thread.nodeName);
 134         return hfsplus_btree_find(fd);
 135 }
 136
 137 int hfsplus_create_cat(u32 cnid, struct inode *dir, struct qstr *str, struct inode *inode)
 138 {
 139         struct hfsplus_find_data fd;
 140         struct super_block *sb;
 141         hfsplus_cat_entry entry;
 142         int entry_size;
 143         int err;
 144
 145         dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n", str->name, cnid, inode->i_nlink);
 146         sb = dir->i_sb;
 147         hfsplus_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 148
 149         hfsplus_fill_cat_key(fd.search_key, cnid, NULL);
 150         entry_size = hfsplus_fill_cat_thread(&entry, S_ISDIR(inode->i_mode) ?
 151                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
 152                         dir->i_ino, str);
 153         err = hfsplus_btree_find(&fd);
 154         if (err != -ENOENT) {
 155                 if (!err)
 156                         err = -EEXIST;
 157                 goto out;
 158         }
 159         err = hfsplus_bnode_insert_rec(&fd, &entry, entry_size);
 160         if (err)
 161                 goto out;
 162
 163         hfsplus_fill_cat_key(fd.search_key, dir->i_ino, str);
 164         entry_size = hfsplus_fill_cat_entry(&entry, cnid, inode);
 165         err = hfsplus_btree_find(&fd);
 166         if (err != -ENOENT) {
 167                 /* panic? */
 168                 if (!err)
 169                         err = -EEXIST;
 170                 goto out;
 171         }
 172         err = hfsplus_bnode_insert_rec(&fd, &entry, entry_size);
 173         if (!err) {
 174                 dir->i_size++;
 175                 mark_inode_dirty(dir);
 176         }
 177 out:
 178         hfsplus_find_exit(&fd);
 179
 180         return err;
 181 }
 182
 183 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
 184 {
 185         struct super_block *sb;
 186         struct hfsplus_find_data fd;
 187         hfsplus_fork_raw fork;
 188         struct list_head *pos;
 189         int err, off;
 190         u16 type;
 191
 192         dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 193         sb = dir->i_sb;
 194         hfsplus_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 195
 196         if (!str) {
 197                 int len;
 198
 199                 hfsplus_fill_cat_key(fd.search_key, cnid, NULL);
 200                 err = hfsplus_btree_find(&fd);
 201                 if (err)
 202                         goto out;
 203
 204                 off = fd.entryoffset + offsetof(hfsplus_cat_thread, nodeName);
 205                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
 206                 hfsplus_bnode_readbytes(fd.bnode, &fd.search_key->cat.name.length, off, 2);
 207                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
 208                 hfsplus_bnode_readbytes(fd.bnode, &fd.search_key->cat.name.unicode, off + 2, len);
 209                 fd.search_key->key_len = cpu_to_be16(6 + len);
 210         } else
 211                 hfsplus_fill_cat_key(fd.search_key, dir->i_ino, str);
 212
 213         err = hfsplus_btree_find(&fd);
 214         if (err)
 215                 goto out;
 216
 217         type = hfsplus_bnode_read_u16(fd.bnode, fd.entryoffset);
 218         if (type == HFSPLUS_FILE) {
 219 #if 0
 220                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
 221                 hfsplus_bnode_readbytes(fd.bnode, &fork, off, sizeof(fork));
 222                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
 223 #endif
 224
 225                 off = fd.entryoffset + offsetof(hfsplus_cat_file, rsrc_fork);
 226                 hfsplus_bnode_readbytes(fd.bnode, &fork, off, sizeof(fork));
 227                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
 228         }
 229
 230         list_for_each(pos, &HFSPLUS_I(dir).open_dir_list) {
 231                 struct hfsplus_readdir_data *rd =
 232                         list_entry(pos, struct hfsplus_readdir_data, list);
 233                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 234                         rd->file->f_pos--;
 235         }
 236
 237         err = hfsplus_bnode_remove_rec(&fd);
 238         if (err)
 239                 goto out;
 240
 241         hfsplus_fill_cat_key(fd.search_key, cnid, NULL);
 242         err = hfsplus_btree_find(&fd);
 243         if (err)
 244                 goto out;
 245
 246         err = hfsplus_bnode_remove_rec(&fd);
 247         if (err)
 248                 goto out;
 249
 250         dir->i_size--;
 251         mark_inode_dirty(dir);
 252 out:
 253         hfsplus_find_exit(&fd);
 254
 255         return err;
 256 }
 257
 258 int hfsplus_rename_cat(u32 cnid,
 259                        struct inode *src_dir, struct qstr *src_name,
 260                        struct inode *dst_dir, struct qstr *dst_name)
 261 {
 262         struct super_block *sb;
 263         struct hfsplus_find_data src_fd, dst_fd;
 264         hfsplus_cat_entry entry;
 265         int entry_size, type;
 266         int err = 0;
 267
 268         dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n", cnid, src_dir->i_ino, src_name->name,
 269                 dst_dir->i_ino, dst_name->name);
 270         sb = src_dir->i_sb;
 271         hfsplus_find_init(HFSPLUS_SB(sb).cat_tree, &src_fd);
 272         dst_fd = src_fd;
 273
 274         /* find the old dir entry and read the data */
 275         hfsplus_fill_cat_key(src_fd.search_key, src_dir->i_ino, src_name);
 276         err = hfsplus_btree_find(&src_fd);
 277         if (err)
 278                 goto out;
 279
 280         hfsplus_bnode_readbytes(src_fd.bnode, &entry, src_fd.entryoffset,
 281                                 src_fd.entrylength);
 282
 283         /* create new dir entry with the data from the old entry */
 284         hfsplus_fill_cat_key(dst_fd.search_key, dst_dir->i_ino, dst_name);
 285         err = hfsplus_btree_find(&dst_fd);
 286         if (err != -ENOENT) {
 287                 if (!err)
 288                         err = -EEXIST;
 289                 goto out;
 290         }
 291
 292         err = hfsplus_bnode_insert_rec(&dst_fd, &entry, src_fd.entrylength);
 293         if (err)
 294                 goto out;
 295         dst_dir->i_size++;
 296         mark_inode_dirty(dst_dir);
 297
 298         /* finally remove the old entry */
 299         hfsplus_fill_cat_key(src_fd.search_key, src_dir->i_ino, src_name);
 300         err = hfsplus_btree_find(&src_fd);
 301         if (err)
 302                 goto out;
 303         err = hfsplus_bnode_remove_rec(&src_fd);
 304         if (err)
 305                 goto out;
 306         src_dir->i_size--;
 307         mark_inode_dirty(src_dir);
 308
 309         /* remove old thread entry */
 310         hfsplus_fill_cat_key(src_fd.search_key, cnid, NULL);
 311         err = hfsplus_btree_find(&src_fd);
 312         if (err)
 313                 goto out;
 314         type = hfsplus_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
 315         err = hfsplus_bnode_remove_rec(&src_fd);
 316         if (err)
 317                 goto out;
 318
 319         /* create new thread entry */
 320         hfsplus_fill_cat_key(dst_fd.search_key, cnid, NULL);
 321         entry_size = hfsplus_fill_cat_thread(&entry, type, dst_dir->i_ino, dst_name);
 322         err = hfsplus_btree_find(&dst_fd);
 323         if (err != -ENOENT) {
 324                 if (!err)
 325                         err = -EEXIST;
 326                 goto out;
 327         }
 328         err = hfsplus_bnode_insert_rec(&dst_fd, &entry, entry_size);
 329 out:
 330         hfsplus_put_bnode(dst_fd.bnode);
 331         hfsplus_find_exit(&src_fd);
 332         return err;
 333 }