linux/fs/hfs/catalog.c

/*
 *  linux/fs/hfs/catalog.c
 *
 * Copyright (C) 1995-1997  Paul H. Hargrove
 * (C) 2003 Ardis Technologies <[email protected]>
 * This file may be distributed under the terms of the GNU General Public License.
 *
 * This file contains the functions related to the catalog B-tree.
 *
 * Cache code shamelessly stolen from
 *     linux/fs/inode.c Copyright (C) 1991, 1992  Linus Torvalds
 *     re-shamelessly stolen Copyright (C) 1997 Linus Torvalds
 */

#include "hfs_fs.h"
#include "btree.h"

/*
 * hfs_cat_build_key()
 *
 * Given the ID of the parent and the name build a search key.
 */
void hfs_cat_build_key(struct super_block *sb, btree_key *key, u32 parent, const struct qstr *name)
{ … }

static int hfs_cat_build_record(hfs_cat_rec *rec, u32 cnid, struct inode *inode)
{ … }

static int hfs_cat_build_thread(struct super_block *sb,
				hfs_cat_rec *rec, int type,
				u32 parentid, const struct qstr *name)
{ … }

/*
 * create_entry()
 *
 * Add a new file or directory to the catalog B-tree and
 * return a (struct hfs_cat_entry) for it in '*result'.
 */
int hfs_cat_create(u32 cnid, struct inode *dir, const struct qstr *str, struct inode *inode)
{ … }

/*
 * hfs_cat_compare()
 *
 * Description:
 *   This is the comparison function used for the catalog B-tree.  In
 *   comparing catalog B-tree entries, the parent id is the most
 *   significant field (compared as unsigned ints).  The name field is
 *   the least significant (compared in "Macintosh lexical order",
 *   see hfs_strcmp() in string.c)
 * Input Variable(s):
 *   struct hfs_cat_key *key1: pointer to the first key to compare
 *   struct hfs_cat_key *key2: pointer to the second key to compare
 * Output Variable(s):
 *   NONE
 * Returns:
 *   int: negative if key1<key2, positive if key1>key2, and 0 if key1==key2
 * Preconditions:
 *   key1 and key2 point to "valid" (struct hfs_cat_key)s.
 * Postconditions:
 *   This function has no side-effects
 */
int hfs_cat_keycmp(const btree_key *key1, const btree_key *key2)
{ … }

/* Try to get a catalog entry for given catalog id */
// move to read_super???
int hfs_cat_find_brec(struct super_block *sb, u32 cnid,
		      struct hfs_find_data *fd)
{ … }


/*
 * hfs_cat_delete()
 *
 * Delete the indicated file or directory.
 * The associated thread is also removed unless ('with_thread'==0).
 */
int hfs_cat_delete(u32 cnid, struct inode *dir, const struct qstr *str)
{ … }

/*
 * hfs_cat_move()
 *
 * Rename a file or directory, possibly to a new directory.
 * If the destination exists it is removed and a
 * (struct hfs_cat_entry) for it is returned in '*result'.
 */
int hfs_cat_move(u32 cnid, struct inode *src_dir, const struct qstr *src_name,
		 struct inode *dst_dir, const struct qstr *dst_name)
{ … }