1 files changed, 302 insertions, 0 deletions
diff --git a/fs/adfs/dir.c b/fs/adfs/dir.c
new file mode 100644
index 0000000..0b4c3a0
--- /dev/null
+++ b/fs/adfs/dir.c
@@ -0,0 +1,302 @@
+/*
+ *  linux/fs/adfs/dir.c
+ *
+ *  Copyright (C) 1999-2000 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Common directory handling for ADFS
+ */
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/adfs_fs.h>
+#include <linux/time.h>
+#include <linux/stat.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>		/* for file_fsync() */
+
+#include "adfs.h"
+
+/*
+ * For future.  This should probably be per-directory.
+ */
+static DEFINE_RWLOCK(adfs_dir_lock);
+
+static int
+adfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+	struct inode *inode = filp->f_dentry->d_inode;
+	struct super_block *sb = inode->i_sb;
+	struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
+	struct object_info obj;
+	struct adfs_dir dir;
+	int ret = 0;
+
+	lock_kernel();	
+
+	if (filp->f_pos >> 32)
+		goto out;
+
+	ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
+	if (ret)
+		goto out;
+
+	switch ((unsigned long)filp->f_pos) {
+	case 0:
+		if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
+			goto free_out;
+		filp->f_pos += 1;
+
+	case 1:
+		if (filldir(dirent, "..", 2, 1, dir.parent_id, DT_DIR) < 0)
+			goto free_out;
+		filp->f_pos += 1;
+
+	default:
+		break;
+	}
+
+	read_lock(&adfs_dir_lock);
+
+	ret = ops->setpos(&dir, filp->f_pos - 2);
+	if (ret)
+		goto unlock_out;
+	while (ops->getnext(&dir, &obj) == 0) {
+		if (filldir(dirent, obj.name, obj.name_len,
+			    filp->f_pos, obj.file_id, DT_UNKNOWN) < 0)
+			goto unlock_out;
+		filp->f_pos += 1;
+	}
+
+unlock_out:
+	read_unlock(&adfs_dir_lock);
+
+free_out:
+	ops->free(&dir);
+
+out:
+	unlock_kernel();
+	return ret;
+}
+
+int
+adfs_dir_update(struct super_block *sb, struct object_info *obj)
+{
+	int ret = -EINVAL;
+#ifdef CONFIG_ADFS_FS_RW
+	struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
+	struct adfs_dir dir;
+
+	printk(KERN_INFO "adfs_dir_update: object %06X in dir %06X\n",
+		 obj->file_id, obj->parent_id);
+
+	if (!ops->update) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = ops->read(sb, obj->parent_id, 0, &dir);
+	if (ret)
+		goto out;
+
+	write_lock(&adfs_dir_lock);
+	ret = ops->update(&dir, obj);
+	write_unlock(&adfs_dir_lock);
+
+	ops->free(&dir);
+out:
+#endif
+	return ret;
+}
+
+static int
+adfs_match(struct qstr *name, struct object_info *obj)
+{
+	int i;
+
+	if (name->len != obj->name_len)
+		return 0;
+
+	for (i = 0; i < name->len; i++) {
+		char c1, c2;
+
+		c1 = name->name[i];
+		c2 = obj->name[i];
+
+		if (c1 >= 'A' && c1 <= 'Z')
+			c1 += 'a' - 'A';
+		if (c2 >= 'A' && c2 <= 'Z')
+			c2 += 'a' - 'A';
+
+		if (c1 != c2)
+			return 0;
+	}
+	return 1;
+}
+
+static int
+adfs_dir_lookup_byname(struct inode *inode, struct qstr *name, struct object_info *obj)
+{
+	struct super_block *sb = inode->i_sb;
+	struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
+	struct adfs_dir dir;
+	int ret;
+
+	ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
+	if (ret)
+		goto out;
+
+	if (ADFS_I(inode)->parent_id != dir.parent_id) {
+		adfs_error(sb, "parent directory changed under me! (%lx but got %lx)\n",
+			   ADFS_I(inode)->parent_id, dir.parent_id);
+		ret = -EIO;
+		goto free_out;
+	}
+
+	obj->parent_id = inode->i_ino;
+
+	/*
+	 * '.' is handled by reserved_lookup() in fs/namei.c
+	 */
+	if (name->len == 2 && name->name[0] == '.' && name->name[1] == '.') {
+		/*
+		 * Currently unable to fill in the rest of 'obj',
+		 * but this is better than nothing.  We need to
+		 * ascend one level to find it's parent.
+		 */
+		obj->name_len = 0;
+		obj->file_id  = obj->parent_id;
+		goto free_out;
+	}
+
+	read_lock(&adfs_dir_lock);
+
+	ret = ops->setpos(&dir, 0);
+	if (ret)
+		goto unlock_out;
+
+	ret = -ENOENT;
+	while (ops->getnext(&dir, obj) == 0) {
+		if (adfs_match(name, obj)) {
+			ret = 0;
+			break;
+		}
+	}
+
+unlock_out:
+	read_unlock(&adfs_dir_lock);
+
+free_out:
+	ops->free(&dir);
+out:
+	return ret;
+}
+
+struct file_operations adfs_dir_operations = {
+	.read		= generic_read_dir,
+	.readdir	= adfs_readdir,
+	.fsync		= file_fsync,
+};
+
+static int
+adfs_hash(struct dentry *parent, struct qstr *qstr)
+{
+	const unsigned int name_len = ADFS_SB(parent->d_sb)->s_namelen;
+	const unsigned char *name;
+	unsigned long hash;
+	int i;
+
+	if (qstr->len < name_len)
+		return 0;
+
+	/*
+	 * Truncate the name in place, avoids
+	 * having to define a compare function.
+	 */
+	qstr->len = i = name_len;
+	name = qstr->name;
+	hash = init_name_hash();
+	while (i--) {
+		char c;
+
+		c = *name++;
+		if (c >= 'A' && c <= 'Z')
+			c += 'a' - 'A';
+
+		hash = partial_name_hash(c, hash);
+	}
+	qstr->hash = end_name_hash(hash);
+
+	return 0;
+}
+
+/*
+ * Compare two names, taking note of the name length
+ * requirements of the underlying filesystem.
+ */
+static int
+adfs_compare(struct dentry *parent, struct qstr *entry, struct qstr *name)
+{
+	int i;
+
+	if (entry->len != name->len)
+		return 1;
+
+	for (i = 0; i < name->len; i++) {
+		char a, b;
+
+		a = entry->name[i];
+		b = name->name[i];
+
+		if (a >= 'A' && a <= 'Z')
+			a += 'a' - 'A';
+		if (b >= 'A' && b <= 'Z')
+			b += 'a' - 'A';
+
+		if (a != b)
+			return 1;
+	}
+	return 0;
+}
+
+struct dentry_operations adfs_dentry_operations = {
+	.d_hash		= adfs_hash,
+	.d_compare	= adfs_compare,
+};
+
+static struct dentry *
+adfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
+{
+	struct inode *inode = NULL;
+	struct object_info obj;
+	int error;
+
+	dentry->d_op = &adfs_dentry_operations;	
+	lock_kernel();
+	error = adfs_dir_lookup_byname(dir, &dentry->d_name, &obj);
+	if (error == 0) {
+		error = -EACCES;
+		/*
+		 * This only returns NULL if get_empty_inode
+		 * fails.
+		 */
+		inode = adfs_iget(dir->i_sb, &obj);
+		if (inode)
+			error = 0;
+	}
+	unlock_kernel();
+	d_add(dentry, inode);
+	return ERR_PTR(error);
+}
+
+/*
+ * directories can handle most operations...
+ */
+struct inode_operations adfs_dir_inode_operations = {
+	.lookup		= adfs_lookup,
+	.setattr	= adfs_notify_change,
+};