text: // SPDX-License-Identifier: GPL-2.0
  /*
   *  linux/fs/hfsplus/catalog.c
   *
   * Copyright (C) 2001
   * Brad Boyer (flar@allandria.com)
   * (C) 2003 Ardis Technologies <roman@ardistech.com>
   *
   * Handling of catalog records
   */
  
  
  #include "hfsplus_fs.h"
  #include "hfsplus_raw.h"
  
  int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
  			     const hfsplus_btree_key *k2)
  {
  	__be32 k1p, k2p;
  
  	k1p = k1->cat.parent;
  	k2p = k2->cat.parent;
  	if (k1p != k2p)
  		return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
  
  	return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
  }
  
  int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
  			    const hfsplus_btree_key *k2)
  {
  	__be32 k1p, k2p;
  
  	k1p = k1->cat.parent;
  	k2p = k2->cat.parent;
  	if (k1p != k2p)
  		return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
  
  	return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
  }
  
  /* Generates key for catalog file/folders record. */
  int hfsplus_cat_build_key(struct super_block *sb,
  		hfsplus_btree_key *key, u32 parent, const struct qstr *str)
  {
  	int len, err;
  
  	key->cat.parent = cpu_to_be32(parent);
  	err = hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
  			str->name, str->len);
  	if (unlikely(err < 0))
  		return err;
  
  	len = be16_to_cpu(key->cat.name.length);
  	key->key_len = cpu_to_be16(6 + 2 * len);
  	return 0;
  }
  
  /* Generates key for catalog thread record. */
  void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
  			hfsplus_btree_key *key, u32 parent)
  {
  	key->cat.parent = cpu_to_be32(parent);
  	key->cat.name.length = 0;
  	key->key_len = cpu_to_be16(6);
  }
  
  static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
  				      struct hfsplus_unistr *name)
  {
  	int ustrlen;
  
  	ustrlen = be16_to_cpu(name->length);
  	key->cat.parent = cpu_to_be32(parent);
  	key->cat.name.length = cpu_to_be16(ustrlen);
  	ustrlen *= 2;
  	memcpy(key->cat.name.unicode, name->unicode, ustrlen);
  	key->key_len = cpu_to_be16(6 + ustrlen);
  }
  
  void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
  {
  	if (inode->i_flags & S_IMMUTABLE)
  		perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
  	else
  		perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
  	if (inode->i_flags & S_APPEND)
  		perms->rootflags |= HFSPLUS_FLG_APPEND;
  	else
  		perms->rootflags &= ~HFSPLUS_FLG_APPEND;
  
  	perms->userflags = HFSPLUS_I(inode)->userflags;
  	perms->mode = cpu_to_be16(inode->i_mode);
  	perms->owner = cpu_to_be32(i_uid_read(inode));
  	perms->group = cpu_to_be32(i_gid_read(inode));
  
  	if (S_ISREG(inode->i_mode))
  		perms->dev = cpu_to_be32(inode->i_nlink);
  	else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
  		perms->dev = cpu_to_be32(inode->i_rdev);
  	else
  		perms->dev = 0;
  }
  
  static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
  		u32 cnid, struct inode *inode)
  {
  	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
  
  	if (S_ISDIR(inode->i_mode)) {
  		struct hfsplus_cat_folder *folder;
  
  		folder = &entry->folder;
  		memset(folder, 0, sizeof(*folder));
  		folder->type = cpu_to_be16(HFSPLUS_FOLDER);
  		if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
  			folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
  		folder->id = cpu_to_be32(inode->i_ino);
  		HFSPLUS_I(inode)->create_date =
  			folder->create_date =
  			folder->content_mod_date =
  			folder->attribute_mod_date =
  			folder->access_date = hfsp_now2mt();
  		hfsplus_cat_set_perms(inode, &folder->permissions);
  		if (inode == sbi->hidden_dir)
  			/* invisible and namelocked */
  			folder->user_info.frFlags = cpu_to_be16(0x5000);
  		return sizeof(*folder);
  	} else {
  		struct hfsplus_cat_file *file;
  
  		file = &entry->file;
  		memset(file, 0, sizeof(*file));
  		file->type = cpu_to_be16(HFSPLUS_FILE);
  		file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
  		file->id = cpu_to_be32(cnid);
  		HFSPLUS_I(inode)->create_date =
  			file->create_date =
  			file->content_mod_date =
  			file->attribute_mod_date =
  			file->access_date = hfsp_now2mt();
  		if (cnid == inode->i_ino) {
  			hfsplus_cat_set_perms(inode, &file->permissions);
  			if (S_ISLNK(inode->i_mode)) {
  				file->user_info.fdType =
  					cpu_to_be32(HFSP_SYMLINK_TYPE);
  				file->user_info.fdCreator =
  					cpu_to_be32(HFSP_SYMLINK_CREATOR);
  			} else {
  				file->user_info.fdType =
  					cpu_to_be32(sbi->type);
  				file->user_info.fdCreator =
  					cpu_to_be32(sbi->creator);
  			}
  			if (HFSPLUS_FLG_IMMUTABLE &
  					(file->permissions.rootflags |
  					file->permissions.userflags))
  				file->flags |=
  					cpu_to_be16(HFSPLUS_FILE_LOCKED);
  		} else {
  			file->user_info.fdType =
  				cpu_to_be32(HFSP_HARDLINK_TYPE);
  			file->user_info.fdCreator =
  				cpu_to_be32(HFSP_HFSPLUS_CREATOR);
  			file->user_info.fdFlags =
  				cpu_to_be16(0x100);
  			file->create_date =
  				HFSPLUS_I(sbi->hidden_dir)->create_date;
  			file->permissions.dev =
  				cpu_to_be32(HFSPLUS_I(inode)->linkid);
  		}
  		return sizeof(*file);
  	}
  }
  
  static int hfsplus_fill_cat_thread(struct super_block *sb,
  				   hfsplus_cat_entry *entry, int type,
  				   u32 parentid, const struct qstr *str)
  {
  	int err;
  
  	entry->type = cpu_to_be16(type);
  	entry->thread.reserved = 0;
  	entry->thread.parentID = cpu_to_be32(parentid);
  	err = hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
  				str->name, str->len);
  	if (unlikely(err < 0))
  		return err;
  
  	return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
  }
  
  /* Try to get a catalog entry for given catalog id */
  int hfsplus_find_cat(struct super_block *sb, u32 cnid,
  		     struct hfs_find_data *fd)
  {
  	hfsplus_cat_entry tmp;
  	int err;
  	u16 type;
  
  	hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid);
  	err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
  	if (err)
  		return err;
  
  	type = be16_to_cpu(tmp.type);
  	if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
  		pr_err("found bad thread record in catalog\n");
  		return -EIO;
  	}
  
  	if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
  		pr_err("catalog name length corrupted\n");
  		return -EIO;
  	}
  
  	hfsplus_cat_build_key_uni(fd->search_key,
  		be32_to_cpu(tmp.thread.parentID),
  		&tmp.thread.nodeName);
  	return hfs_brec_find(fd, hfs_find_rec_by_key);
  }
  
  static void hfsplus_subfolders_inc(struct inode *dir)
  {
  	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
  
  	if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
  		/*
  		 * Increment subfolder count. Note, the value is only meaningful
  		 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
  		 */
  		HFSPLUS_I(dir)->subfolders++;
  	}
  }
  
  static void hfsplus_subfolders_dec(struct inode *dir)
  {
  	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
  
  	if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
  		/*
  		 * Decrement subfolder count. Note, the value is only meaningful
  		 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
  		 *
  		 * Check for zero. Some subfolders may have been created
  		 * by an implementation ignorant of this counter.
  		 */
  		if (HFSPLUS_I(dir)->subfolders)
  			HFSPLUS_I(dir)->subfolders--;
  	}
  }
  
  int hfsplus_create_cat(u32 cnid, struct inode *dir,
  		const struct qstr *str, struct inode *inode)
  {
  	struct super_block *sb = dir->i_sb;
  	struct hfs_find_data fd;
  	hfsplus_cat_entry entry;
  	int entry_size;
  	int err;
  
  	hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
  		str->name, cnid, inode->i_nlink);
  	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
  	if (err)
  		return err;
  
  	/*
  	 * Fail early and avoid ENOSPC during the btree operations. We may
  	 * have to split the root node at most once.
  	 */
  	err = hfs_bmap_reserve(fd.tree, 2 * fd.tree->depth);
  	if (err)
  		goto err2;
  
  	hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
  	entry_size = hfsplus_fill_cat_thread(sb, &entry,
  		S_ISDIR(inode->i_mode) ?
  			HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
  		dir->i_ino, str);
  	if (unlikely(entry_size < 0)) {
  		err = entry_size;
  		goto err2;
  	}
  
  	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
  	if (err != -ENOENT) {
  		if (!err)
  			err = -EEXIST;
  		goto err2;
  	}
  	err = hfs_brec_insert(&fd, &entry, entry_size);
  	if (err)
  		goto err2;
  
  	err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
  	if (unlikely(err))
  		goto err1;
  
  	entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
  	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
  	if (err != -ENOENT) {
  		/* panic? */
  		if (!err)
  			err = -EEXIST;
  		goto err1;
  	}
  	err = hfs_brec_insert(&fd, &entry, entry_size);
  	if (err)
  		goto err1;
  
  	dir->i_size++;
  	if (S_ISDIR(inode->i_mode))
  		hfsplus_subfolders_inc(dir);
  	dir->i_mtime = dir->i_ctime = current_time(dir);
  	hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
  
  	hfs_find_exit(&fd);
  	return 0;
  
  err1:
  	hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
  	if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
  		hfs_brec_remove(&fd);
  err2:
  	hfs_find_exit(&fd);
  	return err;
  }
  
  int hfsplus_delete_cat(u32 cnid, struct inode *dir, const struct qstr *str)
  {
  	struct super_block *sb = dir->i_sb;
  	struct hfs_find_data fd;
  	struct hfsplus_fork_raw fork;
  	struct list_head *pos;
  	int err, off;
  	u16 type;
  
  	hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
  	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
  	if (err)
  		return err;
  
  	/*
  	 * Fail early and avoid ENOSPC during the btree operations. We may
  	 * have to split the root node at most once.
  	 */
  	err = hfs_bmap_reserve(fd.tree, 2 * (int)fd.tree->depth - 2);
  	if (err)
  		goto out;
  
  	if (!str) {
  		int len;
  
  		hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
  		err = hfs_brec_find(&fd, hfs_find_rec_by_key);
  		if (err)
  			goto out;
  
  		off = fd.entryoffset +
  			offsetof(struct hfsplus_cat_thread, nodeName);
  		fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
  		hfs_bnode_read(fd.bnode,
  			&fd.search_key->cat.name.length, off, 2);
  		len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
  		hfs_bnode_read(fd.bnode,
  			&fd.search_key->cat.name.unicode,
  			off + 2, len);
  		fd.search_key->key_len = cpu_to_be16(6 + len);
  	} else {
  		err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
  		if (unlikely(err))
  			goto out;
  	}
  
  	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
  	if (err)
  		goto out;
  
  	type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
  	if (type == HFSPLUS_FILE) {
  #if 0
  		off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
  		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
  		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
  #endif
  
  		off = fd.entryoffset +
  			offsetof(struct hfsplus_cat_file, rsrc_fork);
  		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
  		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
  	}
  
  	/* we only need to take spinlock for exclusion with ->release() */
  	spin_lock(&HFSPLUS_I(dir)->open_dir_lock);
  	list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
  		struct hfsplus_readdir_data *rd =
  			list_entry(pos, struct hfsplus_readdir_data, list);
  		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
  			rd->file->f_pos--;
  	}
  	spin_unlock(&HFSPLUS_I(dir)->open_dir_lock);
  
  	err = hfs_brec_remove(&fd);
  	if (err)
  		goto out;
  
  	hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
  	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
  	if (err)
  		goto out;
  
  	err = hfs_brec_remove(&fd);
  	if (err)
  		goto out;
  
  	dir->i_size--;
  	if (type == HFSPLUS_FOLDER)
  		hfsplus_subfolders_dec(dir);
  	dir->i_mtime = dir->i_ctime = current_time(dir);
  	hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
  
  	if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
  		if (HFSPLUS_SB(sb)->attr_tree)
  			hfsplus_delete_all_attrs(dir, cnid);
  	}
  
  out:
  	hfs_find_exit(&fd);
  
  	return err;
  }
  
  int hfsplus_rename_cat(u32 cnid,
  		       struct inode *src_dir, const struct qstr *src_name,
  		       struct inode *dst_dir, const struct qstr *dst_name)
  {
  	struct super_block *sb = src_dir->i_sb;
  	struct hfs_find_data src_fd, dst_fd;
  	hfsplus_cat_entry entry;
  	int entry_size, type;
  	int err;
  
  	hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
  		cnid, src_dir->i_ino, src_name->name,
  		dst_dir->i_ino, dst_name->name);
  	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
  	if (err)
  		return err;
  	dst_fd = src_fd;
  
  	/*
  	 * Fail early and avoid ENOSPC during the btree operations. We may
  	 * have to split the root node at most twice.
  	 */
  	err = hfs_bmap_reserve(src_fd.tree, 4 * (int)src_fd.tree->depth - 1);
  	if (err)
  		goto out;
  
  	/* find the old dir entry and read the data */
  	err = hfsplus_cat_build_key(sb, src_fd.search_key,
  			src_dir->i_ino, src_name);
  	if (unlikely(err))
  		goto out;
  
  	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
  	if (err)
  		goto out;
  	if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
  		err = -EIO;
  		goto out;
  	}
  
  	hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
  				src_fd.entrylength);
  	type = be16_to_cpu(entry.type);
  
  	/* create new dir entry with the data from the old entry */
  	err = hfsplus_cat_build_key(sb, dst_fd.search_key,
  			dst_dir->i_ino, dst_name);
  	if (unlikely(err))
  		goto out;
  
  	err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
  	if (err != -ENOENT) {
  		if (!err)
  			err = -EEXIST;
  		goto out;
  	}
  
  	err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
  	if (err)
  		goto out;
  	dst_dir->i_size++;
  	if (type == HFSPLUS_FOLDER)
  		hfsplus_subfolders_inc(dst_dir);
  	dst_dir->i_mtime = dst_dir->i_ctime = current_time(dst_dir);
  
  	/* finally remove the old entry */
  	err = hfsplus_cat_build_key(sb, src_fd.search_key,
  			src_dir->i_ino, src_name);
  	if (unlikely(err))
  		goto out;
  
  	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
  	if (err)
  		goto out;
  	err = hfs_brec_remove(&src_fd);
  	if (err)
  		goto out;
  	src_dir->i_size--;
  	if (type == HFSPLUS_FOLDER)
  		hfsplus_subfolders_dec(src_dir);
  	src_dir->i_mtime = src_dir->i_ctime = current_time(src_dir);
  
  	/* remove old thread entry */
  	hfsplus_cat_build_key_with_cnid(sb, src_fd.search_key, cnid);
  	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
  	if (err)
  		goto out;
  	type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
  	err = hfs_brec_remove(&src_fd);
  	if (err)
  		goto out;
  
  	/* create new thread entry */
  	hfsplus_cat_build_key_with_cnid(sb, dst_fd.search_key, cnid);
  	entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
  		dst_dir->i_ino, dst_name);
  	if (unlikely(entry_size < 0)) {
  		err = entry_size;
  		goto out;
  	}
  
  	err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
  	if (err != -ENOENT) {
  		if (!err)
  			err = -EEXIST;
  		goto out;
  	}
  	err = hfs_brec_insert(&dst_fd, &entry, entry_size);
  
  	hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
  	hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
  out:
  	hfs_bnode_put(dst_fd.bnode);
  	hfs_find_exit(&src_fd);
  	return err;
  }
  