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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *  linux/fs/hfsplus/catalog.c
0004  *
0005  * Copyright (C) 2001
0006  * Brad Boyer (flar@allandria.com)
0007  * (C) 2003 Ardis Technologies <roman@ardistech.com>
0008  *
0009  * Handling of catalog records
0010  */
0011 
0012 
0013 #include "hfsplus_fs.h"
0014 #include "hfsplus_raw.h"
0015 
0016 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
0017                  const hfsplus_btree_key *k2)
0018 {
0019     __be32 k1p, k2p;
0020 
0021     k1p = k1->cat.parent;
0022     k2p = k2->cat.parent;
0023     if (k1p != k2p)
0024         return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
0025 
0026     return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
0027 }
0028 
0029 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
0030                 const hfsplus_btree_key *k2)
0031 {
0032     __be32 k1p, k2p;
0033 
0034     k1p = k1->cat.parent;
0035     k2p = k2->cat.parent;
0036     if (k1p != k2p)
0037         return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
0038 
0039     return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
0040 }
0041 
0042 /* Generates key for catalog file/folders record. */
0043 int hfsplus_cat_build_key(struct super_block *sb,
0044         hfsplus_btree_key *key, u32 parent, const struct qstr *str)
0045 {
0046     int len, err;
0047 
0048     key->cat.parent = cpu_to_be32(parent);
0049     err = hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
0050             str->name, str->len);
0051     if (unlikely(err < 0))
0052         return err;
0053 
0054     len = be16_to_cpu(key->cat.name.length);
0055     key->key_len = cpu_to_be16(6 + 2 * len);
0056     return 0;
0057 }
0058 
0059 /* Generates key for catalog thread record. */
0060 void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
0061             hfsplus_btree_key *key, u32 parent)
0062 {
0063     key->cat.parent = cpu_to_be32(parent);
0064     key->cat.name.length = 0;
0065     key->key_len = cpu_to_be16(6);
0066 }
0067 
0068 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
0069                       struct hfsplus_unistr *name)
0070 {
0071     int ustrlen;
0072 
0073     ustrlen = be16_to_cpu(name->length);
0074     key->cat.parent = cpu_to_be32(parent);
0075     key->cat.name.length = cpu_to_be16(ustrlen);
0076     ustrlen *= 2;
0077     memcpy(key->cat.name.unicode, name->unicode, ustrlen);
0078     key->key_len = cpu_to_be16(6 + ustrlen);
0079 }
0080 
0081 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
0082 {
0083     if (inode->i_flags & S_IMMUTABLE)
0084         perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
0085     else
0086         perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
0087     if (inode->i_flags & S_APPEND)
0088         perms->rootflags |= HFSPLUS_FLG_APPEND;
0089     else
0090         perms->rootflags &= ~HFSPLUS_FLG_APPEND;
0091 
0092     perms->userflags = HFSPLUS_I(inode)->userflags;
0093     perms->mode = cpu_to_be16(inode->i_mode);
0094     perms->owner = cpu_to_be32(i_uid_read(inode));
0095     perms->group = cpu_to_be32(i_gid_read(inode));
0096 
0097     if (S_ISREG(inode->i_mode))
0098         perms->dev = cpu_to_be32(inode->i_nlink);
0099     else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
0100         perms->dev = cpu_to_be32(inode->i_rdev);
0101     else
0102         perms->dev = 0;
0103 }
0104 
0105 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
0106         u32 cnid, struct inode *inode)
0107 {
0108     struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
0109 
0110     if (S_ISDIR(inode->i_mode)) {
0111         struct hfsplus_cat_folder *folder;
0112 
0113         folder = &entry->folder;
0114         memset(folder, 0, sizeof(*folder));
0115         folder->type = cpu_to_be16(HFSPLUS_FOLDER);
0116         if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
0117             folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
0118         folder->id = cpu_to_be32(inode->i_ino);
0119         HFSPLUS_I(inode)->create_date =
0120             folder->create_date =
0121             folder->content_mod_date =
0122             folder->attribute_mod_date =
0123             folder->access_date = hfsp_now2mt();
0124         hfsplus_cat_set_perms(inode, &folder->permissions);
0125         if (inode == sbi->hidden_dir)
0126             /* invisible and namelocked */
0127             folder->user_info.frFlags = cpu_to_be16(0x5000);
0128         return sizeof(*folder);
0129     } else {
0130         struct hfsplus_cat_file *file;
0131 
0132         file = &entry->file;
0133         memset(file, 0, sizeof(*file));
0134         file->type = cpu_to_be16(HFSPLUS_FILE);
0135         file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
0136         file->id = cpu_to_be32(cnid);
0137         HFSPLUS_I(inode)->create_date =
0138             file->create_date =
0139             file->content_mod_date =
0140             file->attribute_mod_date =
0141             file->access_date = hfsp_now2mt();
0142         if (cnid == inode->i_ino) {
0143             hfsplus_cat_set_perms(inode, &file->permissions);
0144             if (S_ISLNK(inode->i_mode)) {
0145                 file->user_info.fdType =
0146                     cpu_to_be32(HFSP_SYMLINK_TYPE);
0147                 file->user_info.fdCreator =
0148                     cpu_to_be32(HFSP_SYMLINK_CREATOR);
0149             } else {
0150                 file->user_info.fdType =
0151                     cpu_to_be32(sbi->type);
0152                 file->user_info.fdCreator =
0153                     cpu_to_be32(sbi->creator);
0154             }
0155             if (HFSPLUS_FLG_IMMUTABLE &
0156                     (file->permissions.rootflags |
0157                     file->permissions.userflags))
0158                 file->flags |=
0159                     cpu_to_be16(HFSPLUS_FILE_LOCKED);
0160         } else {
0161             file->user_info.fdType =
0162                 cpu_to_be32(HFSP_HARDLINK_TYPE);
0163             file->user_info.fdCreator =
0164                 cpu_to_be32(HFSP_HFSPLUS_CREATOR);
0165             file->user_info.fdFlags =
0166                 cpu_to_be16(0x100);
0167             file->create_date =
0168                 HFSPLUS_I(sbi->hidden_dir)->create_date;
0169             file->permissions.dev =
0170                 cpu_to_be32(HFSPLUS_I(inode)->linkid);
0171         }
0172         return sizeof(*file);
0173     }
0174 }
0175 
0176 static int hfsplus_fill_cat_thread(struct super_block *sb,
0177                    hfsplus_cat_entry *entry, int type,
0178                    u32 parentid, const struct qstr *str)
0179 {
0180     int err;
0181 
0182     entry->type = cpu_to_be16(type);
0183     entry->thread.reserved = 0;
0184     entry->thread.parentID = cpu_to_be32(parentid);
0185     err = hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
0186                 str->name, str->len);
0187     if (unlikely(err < 0))
0188         return err;
0189 
0190     return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
0191 }
0192 
0193 /* Try to get a catalog entry for given catalog id */
0194 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
0195              struct hfs_find_data *fd)
0196 {
0197     hfsplus_cat_entry tmp;
0198     int err;
0199     u16 type;
0200 
0201     hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid);
0202     err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
0203     if (err)
0204         return err;
0205 
0206     type = be16_to_cpu(tmp.type);
0207     if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
0208         pr_err("found bad thread record in catalog\n");
0209         return -EIO;
0210     }
0211 
0212     if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
0213         pr_err("catalog name length corrupted\n");
0214         return -EIO;
0215     }
0216 
0217     hfsplus_cat_build_key_uni(fd->search_key,
0218         be32_to_cpu(tmp.thread.parentID),
0219         &tmp.thread.nodeName);
0220     return hfs_brec_find(fd, hfs_find_rec_by_key);
0221 }
0222 
0223 static void hfsplus_subfolders_inc(struct inode *dir)
0224 {
0225     struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
0226 
0227     if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
0228         /*
0229          * Increment subfolder count. Note, the value is only meaningful
0230          * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
0231          */
0232         HFSPLUS_I(dir)->subfolders++;
0233     }
0234 }
0235 
0236 static void hfsplus_subfolders_dec(struct inode *dir)
0237 {
0238     struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
0239 
0240     if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
0241         /*
0242          * Decrement subfolder count. Note, the value is only meaningful
0243          * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
0244          *
0245          * Check for zero. Some subfolders may have been created
0246          * by an implementation ignorant of this counter.
0247          */
0248         if (HFSPLUS_I(dir)->subfolders)
0249             HFSPLUS_I(dir)->subfolders--;
0250     }
0251 }
0252 
0253 int hfsplus_create_cat(u32 cnid, struct inode *dir,
0254         const struct qstr *str, struct inode *inode)
0255 {
0256     struct super_block *sb = dir->i_sb;
0257     struct hfs_find_data fd;
0258     hfsplus_cat_entry entry;
0259     int entry_size;
0260     int err;
0261 
0262     hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
0263         str->name, cnid, inode->i_nlink);
0264     err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
0265     if (err)
0266         return err;
0267 
0268     /*
0269      * Fail early and avoid ENOSPC during the btree operations. We may
0270      * have to split the root node at most once.
0271      */
0272     err = hfs_bmap_reserve(fd.tree, 2 * fd.tree->depth);
0273     if (err)
0274         goto err2;
0275 
0276     hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
0277     entry_size = hfsplus_fill_cat_thread(sb, &entry,
0278         S_ISDIR(inode->i_mode) ?
0279             HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
0280         dir->i_ino, str);
0281     if (unlikely(entry_size < 0)) {
0282         err = entry_size;
0283         goto err2;
0284     }
0285 
0286     err = hfs_brec_find(&fd, hfs_find_rec_by_key);
0287     if (err != -ENOENT) {
0288         if (!err)
0289             err = -EEXIST;
0290         goto err2;
0291     }
0292     err = hfs_brec_insert(&fd, &entry, entry_size);
0293     if (err)
0294         goto err2;
0295 
0296     err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
0297     if (unlikely(err))
0298         goto err1;
0299 
0300     entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
0301     err = hfs_brec_find(&fd, hfs_find_rec_by_key);
0302     if (err != -ENOENT) {
0303         /* panic? */
0304         if (!err)
0305             err = -EEXIST;
0306         goto err1;
0307     }
0308     err = hfs_brec_insert(&fd, &entry, entry_size);
0309     if (err)
0310         goto err1;
0311 
0312     dir->i_size++;
0313     if (S_ISDIR(inode->i_mode))
0314         hfsplus_subfolders_inc(dir);
0315     dir->i_mtime = dir->i_ctime = current_time(dir);
0316     hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
0317 
0318     hfs_find_exit(&fd);
0319     return 0;
0320 
0321 err1:
0322     hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
0323     if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
0324         hfs_brec_remove(&fd);
0325 err2:
0326     hfs_find_exit(&fd);
0327     return err;
0328 }
0329 
0330 int hfsplus_delete_cat(u32 cnid, struct inode *dir, const struct qstr *str)
0331 {
0332     struct super_block *sb = dir->i_sb;
0333     struct hfs_find_data fd;
0334     struct hfsplus_fork_raw fork;
0335     struct list_head *pos;
0336     int err, off;
0337     u16 type;
0338 
0339     hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
0340     err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
0341     if (err)
0342         return err;
0343 
0344     /*
0345      * Fail early and avoid ENOSPC during the btree operations. We may
0346      * have to split the root node at most once.
0347      */
0348     err = hfs_bmap_reserve(fd.tree, 2 * (int)fd.tree->depth - 2);
0349     if (err)
0350         goto out;
0351 
0352     if (!str) {
0353         int len;
0354 
0355         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
0356         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
0357         if (err)
0358             goto out;
0359 
0360         off = fd.entryoffset +
0361             offsetof(struct hfsplus_cat_thread, nodeName);
0362         fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
0363         hfs_bnode_read(fd.bnode,
0364             &fd.search_key->cat.name.length, off, 2);
0365         len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
0366         hfs_bnode_read(fd.bnode,
0367             &fd.search_key->cat.name.unicode,
0368             off + 2, len);
0369         fd.search_key->key_len = cpu_to_be16(6 + len);
0370     } else {
0371         err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
0372         if (unlikely(err))
0373             goto out;
0374     }
0375 
0376     err = hfs_brec_find(&fd, hfs_find_rec_by_key);
0377     if (err)
0378         goto out;
0379 
0380     type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
0381     if (type == HFSPLUS_FILE) {
0382 #if 0
0383         off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
0384         hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
0385         hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
0386 #endif
0387 
0388         off = fd.entryoffset +
0389             offsetof(struct hfsplus_cat_file, rsrc_fork);
0390         hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
0391         hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
0392     }
0393 
0394     /* we only need to take spinlock for exclusion with ->release() */
0395     spin_lock(&HFSPLUS_I(dir)->open_dir_lock);
0396     list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
0397         struct hfsplus_readdir_data *rd =
0398             list_entry(pos, struct hfsplus_readdir_data, list);
0399         if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
0400             rd->file->f_pos--;
0401     }
0402     spin_unlock(&HFSPLUS_I(dir)->open_dir_lock);
0403 
0404     err = hfs_brec_remove(&fd);
0405     if (err)
0406         goto out;
0407 
0408     hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
0409     err = hfs_brec_find(&fd, hfs_find_rec_by_key);
0410     if (err)
0411         goto out;
0412 
0413     err = hfs_brec_remove(&fd);
0414     if (err)
0415         goto out;
0416 
0417     dir->i_size--;
0418     if (type == HFSPLUS_FOLDER)
0419         hfsplus_subfolders_dec(dir);
0420     dir->i_mtime = dir->i_ctime = current_time(dir);
0421     hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
0422 
0423     if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
0424         if (HFSPLUS_SB(sb)->attr_tree)
0425             hfsplus_delete_all_attrs(dir, cnid);
0426     }
0427 
0428 out:
0429     hfs_find_exit(&fd);
0430 
0431     return err;
0432 }
0433 
0434 int hfsplus_rename_cat(u32 cnid,
0435                struct inode *src_dir, const struct qstr *src_name,
0436                struct inode *dst_dir, const struct qstr *dst_name)
0437 {
0438     struct super_block *sb = src_dir->i_sb;
0439     struct hfs_find_data src_fd, dst_fd;
0440     hfsplus_cat_entry entry;
0441     int entry_size, type;
0442     int err;
0443 
0444     hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
0445         cnid, src_dir->i_ino, src_name->name,
0446         dst_dir->i_ino, dst_name->name);
0447     err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
0448     if (err)
0449         return err;
0450     dst_fd = src_fd;
0451 
0452     /*
0453      * Fail early and avoid ENOSPC during the btree operations. We may
0454      * have to split the root node at most twice.
0455      */
0456     err = hfs_bmap_reserve(src_fd.tree, 4 * (int)src_fd.tree->depth - 1);
0457     if (err)
0458         goto out;
0459 
0460     /* find the old dir entry and read the data */
0461     err = hfsplus_cat_build_key(sb, src_fd.search_key,
0462             src_dir->i_ino, src_name);
0463     if (unlikely(err))
0464         goto out;
0465 
0466     err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
0467     if (err)
0468         goto out;
0469     if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
0470         err = -EIO;
0471         goto out;
0472     }
0473 
0474     hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
0475                 src_fd.entrylength);
0476     type = be16_to_cpu(entry.type);
0477 
0478     /* create new dir entry with the data from the old entry */
0479     err = hfsplus_cat_build_key(sb, dst_fd.search_key,
0480             dst_dir->i_ino, dst_name);
0481     if (unlikely(err))
0482         goto out;
0483 
0484     err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
0485     if (err != -ENOENT) {
0486         if (!err)
0487             err = -EEXIST;
0488         goto out;
0489     }
0490 
0491     err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
0492     if (err)
0493         goto out;
0494     dst_dir->i_size++;
0495     if (type == HFSPLUS_FOLDER)
0496         hfsplus_subfolders_inc(dst_dir);
0497     dst_dir->i_mtime = dst_dir->i_ctime = current_time(dst_dir);
0498 
0499     /* finally remove the old entry */
0500     err = hfsplus_cat_build_key(sb, src_fd.search_key,
0501             src_dir->i_ino, src_name);
0502     if (unlikely(err))
0503         goto out;
0504 
0505     err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
0506     if (err)
0507         goto out;
0508     err = hfs_brec_remove(&src_fd);
0509     if (err)
0510         goto out;
0511     src_dir->i_size--;
0512     if (type == HFSPLUS_FOLDER)
0513         hfsplus_subfolders_dec(src_dir);
0514     src_dir->i_mtime = src_dir->i_ctime = current_time(src_dir);
0515 
0516     /* remove old thread entry */
0517     hfsplus_cat_build_key_with_cnid(sb, src_fd.search_key, cnid);
0518     err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
0519     if (err)
0520         goto out;
0521     type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
0522     err = hfs_brec_remove(&src_fd);
0523     if (err)
0524         goto out;
0525 
0526     /* create new thread entry */
0527     hfsplus_cat_build_key_with_cnid(sb, dst_fd.search_key, cnid);
0528     entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
0529         dst_dir->i_ino, dst_name);
0530     if (unlikely(entry_size < 0)) {
0531         err = entry_size;
0532         goto out;
0533     }
0534 
0535     err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
0536     if (err != -ENOENT) {
0537         if (!err)
0538             err = -EEXIST;
0539         goto out;
0540     }
0541     err = hfs_brec_insert(&dst_fd, &entry, entry_size);
0542 
0543     hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
0544     hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
0545 out:
0546     hfs_bnode_put(dst_fd.bnode);
0547     hfs_find_exit(&src_fd);
0548     return err;
0549 }
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