1 files changed, 383 insertions, 0 deletions
diff --git a/fs/hfs/catalog.c b/fs/hfs/catalog.c
new file mode 100644
index 0000000000..632c226a39
--- /dev/null
+++ b/fs/hfs/catalog.c
@@ -0,0 +1,383 @@
+/*
+ *  linux/fs/hfs/catalog.c
+ *
+ * Copyright (C) 1995-1997  Paul H. Hargrove
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ * 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)
+{
+	key->cat.reserved = 0;
+	key->cat.ParID = cpu_to_be32(parent);
+	if (name) {
+		hfs_asc2mac(sb, &key->cat.CName, name);
+		key->key_len = 6 + key->cat.CName.len;
+	} else {
+		memset(&key->cat.CName, 0, sizeof(struct hfs_name));
+		key->key_len = 6;
+	}
+}
+
+static int hfs_cat_build_record(hfs_cat_rec *rec, u32 cnid, struct inode *inode)
+{
+	__be32 mtime = hfs_mtime();
+
+	memset(rec, 0, sizeof(*rec));
+	if (S_ISDIR(inode->i_mode)) {
+		rec->type = HFS_CDR_DIR;
+		rec->dir.DirID = cpu_to_be32(cnid);
+		rec->dir.CrDat = mtime;
+		rec->dir.MdDat = mtime;
+		rec->dir.BkDat = 0;
+		rec->dir.UsrInfo.frView = cpu_to_be16(0xff);
+		return sizeof(struct hfs_cat_dir);
+	} else {
+		/* init some fields for the file record */
+		rec->type = HFS_CDR_FIL;
+		rec->file.Flags = HFS_FIL_USED | HFS_FIL_THD;
+		if (!(inode->i_mode & S_IWUSR))
+			rec->file.Flags |= HFS_FIL_LOCK;
+		rec->file.FlNum = cpu_to_be32(cnid);
+		rec->file.CrDat = mtime;
+		rec->file.MdDat = mtime;
+		rec->file.BkDat = 0;
+		rec->file.UsrWds.fdType = HFS_SB(inode->i_sb)->s_type;
+		rec->file.UsrWds.fdCreator = HFS_SB(inode->i_sb)->s_creator;
+		return sizeof(struct hfs_cat_file);
+	}
+}
+
+static int hfs_cat_build_thread(struct super_block *sb,
+				hfs_cat_rec *rec, int type,
+				u32 parentid, const struct qstr *name)
+{
+	rec->type = type;
+	memset(rec->thread.reserved, 0, sizeof(rec->thread.reserved));
+	rec->thread.ParID = cpu_to_be32(parentid);
+	hfs_asc2mac(sb, &rec->thread.CName, name);
+	return sizeof(struct hfs_cat_thread);
+}
+
+/*
+ * 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)
+{
+	struct hfs_find_data fd;
+	struct super_block *sb;
+	union hfs_cat_rec entry;
+	int entry_size;
+	int err;
+
+	hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
+		str->name, cnid, inode->i_nlink);
+	if (dir->i_size >= HFS_MAX_VALENCE)
+		return -ENOSPC;
+
+	sb = dir->i_sb;
+	err = hfs_find_init(HFS_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;
+
+	hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
+	entry_size = hfs_cat_build_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
+			HFS_CDR_THD : HFS_CDR_FTH,
+			dir->i_ino, str);
+	err = hfs_brec_find(&fd);
+	if (err != -ENOENT) {
+		if (!err)
+			err = -EEXIST;
+		goto err2;
+	}
+	err = hfs_brec_insert(&fd, &entry, entry_size);
+	if (err)
+		goto err2;
+
+	hfs_cat_build_key(sb, fd.search_key, dir->i_ino, str);
+	entry_size = hfs_cat_build_record(&entry, cnid, inode);
+	err = hfs_brec_find(&fd);
+	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++;
+	dir->i_mtime = inode_set_ctime_current(dir);
+	mark_inode_dirty(dir);
+	hfs_find_exit(&fd);
+	return 0;
+
+err1:
+	hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
+	if (!hfs_brec_find(&fd))
+		hfs_brec_remove(&fd);
+err2:
+	hfs_find_exit(&fd);
+	return err;
+}
+
+/*
+ * 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)
+{
+	__be32 k1p, k2p;
+
+	k1p = key1->cat.ParID;
+	k2p = key2->cat.ParID;
+
+	if (k1p != k2p)
+		return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
+
+	return hfs_strcmp(key1->cat.CName.name, key1->cat.CName.len,
+			  key2->cat.CName.name, key2->cat.CName.len);
+}
+
+/* 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_rec rec;
+	int res, len, type;
+
+	hfs_cat_build_key(sb, fd->search_key, cnid, NULL);
+	res = hfs_brec_read(fd, &rec, sizeof(rec));
+	if (res)
+		return res;
+
+	type = rec.type;
+	if (type != HFS_CDR_THD && type != HFS_CDR_FTH) {
+		pr_err("found bad thread record in catalog\n");
+		return -EIO;
+	}
+
+	fd->search_key->cat.ParID = rec.thread.ParID;
+	len = fd->search_key->cat.CName.len = rec.thread.CName.len;
+	if (len > HFS_NAMELEN) {
+		pr_err("bad catalog namelength\n");
+		return -EIO;
+	}
+	memcpy(fd->search_key->cat.CName.name, rec.thread.CName.name, len);
+	return hfs_brec_find(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)
+{
+	struct super_block *sb;
+	struct hfs_find_data fd;
+	struct hfs_readdir_data *rd;
+	int res, type;
+
+	hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
+	sb = dir->i_sb;
+	res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
+	if (res)
+		return res;
+
+	hfs_cat_build_key(sb, fd.search_key, dir->i_ino, str);
+	res = hfs_brec_find(&fd);
+	if (res)
+		goto out;
+
+	type = hfs_bnode_read_u8(fd.bnode, fd.entryoffset);
+	if (type == HFS_CDR_FIL) {
+		struct hfs_cat_file file;
+		hfs_bnode_read(fd.bnode, &file, fd.entryoffset, sizeof(file));
+		if (be32_to_cpu(file.FlNum) == cnid) {
+#if 0
+			hfs_free_fork(sb, &file, HFS_FK_DATA);
+#endif
+			hfs_free_fork(sb, &file, HFS_FK_RSRC);
+		}
+	}
+
+	/* we only need to take spinlock for exclusion with ->release() */
+	spin_lock(&HFS_I(dir)->open_dir_lock);
+	list_for_each_entry(rd, &HFS_I(dir)->open_dir_list, list) {
+		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
+			rd->file->f_pos--;
+	}
+	spin_unlock(&HFS_I(dir)->open_dir_lock);
+
+	res = hfs_brec_remove(&fd);
+	if (res)
+		goto out;
+
+	hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
+	res = hfs_brec_find(&fd);
+	if (!res) {
+		res = hfs_brec_remove(&fd);
+		if (res)
+			goto out;
+	}
+
+	dir->i_size--;
+	dir->i_mtime = inode_set_ctime_current(dir);
+	mark_inode_dirty(dir);
+	res = 0;
+out:
+	hfs_find_exit(&fd);
+
+	return res;
+}
+
+/*
+ * 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)
+{
+	struct super_block *sb;
+	struct hfs_find_data src_fd, dst_fd;
+	union hfs_cat_rec 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);
+	sb = src_dir->i_sb;
+	err = hfs_find_init(HFS_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 once.
+	 */
+	err = hfs_bmap_reserve(src_fd.tree, 2 * src_fd.tree->depth);
+	if (err)
+		goto out;
+
+	/* find the old dir entry and read the data */
+	hfs_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
+	err = hfs_brec_find(&src_fd);
+	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);
+
+	/* create new dir entry with the data from the old entry */
+	hfs_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
+	err = hfs_brec_find(&dst_fd);
+	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++;
+	dst_dir->i_mtime = inode_set_ctime_current(dst_dir);
+	mark_inode_dirty(dst_dir);
+
+	/* finally remove the old entry */
+	hfs_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
+	err = hfs_brec_find(&src_fd);
+	if (err)
+		goto out;
+	err = hfs_brec_remove(&src_fd);
+	if (err)
+		goto out;
+	src_dir->i_size--;
+	src_dir->i_mtime = inode_set_ctime_current(src_dir);
+	mark_inode_dirty(src_dir);
+
+	type = entry.type;
+	if (type == HFS_CDR_FIL && !(entry.file.Flags & HFS_FIL_THD))
+		goto out;
+
+	/* remove old thread entry */
+	hfs_cat_build_key(sb, src_fd.search_key, cnid, NULL);
+	err = hfs_brec_find(&src_fd);
+	if (err)
+		goto out;
+	err = hfs_brec_remove(&src_fd);
+	if (err)
+		goto out;
+
+	/* create new thread entry */
+	hfs_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
+	entry_size = hfs_cat_build_thread(sb, &entry, type == HFS_CDR_FIL ? HFS_CDR_FTH : HFS_CDR_THD,
+					dst_dir->i_ino, dst_name);
+	err = hfs_brec_find(&dst_fd);
+	if (err != -ENOENT) {
+		if (!err)
+			err = -EEXIST;
+		goto out;
+	}
+	err = hfs_brec_insert(&dst_fd, &entry, entry_size);
+out:
+	hfs_bnode_put(dst_fd.bnode);
+	hfs_find_exit(&src_fd);
+	return err;
+}