patch-2.1.80 linux/fs/adfs/namei.c

• Lines: 120
• Date: Tue Jan 20 16:44:58 1998
• Orig file: v2.1.79/linux/fs/adfs/namei.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.79/linux/fs/adfs/namei.c linux/fs/adfs/namei.c
@@ -0,0 +1,119 @@
+/*
+ *  linux/fs/adfs/namei.c
+ *
+ * Copyright (C) 1997 Russell King
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/adfs_fs.h>
+#include <linux/fcntl.h>
+#include <linux/sched.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/locks.h>
+
+/*
+ * NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure
+ */
+static int adfs_match (int len, const char * const name, struct adfs_idir_entry *de)
+{
+	int i;
+
+	if (!de || len > ADFS_NAME_LEN)
+		return 0;
+	/*
+	 * "" means "." ---> so paths like "/usr/lib//libc.a" work
+	 */
+	if (!len && de->name_len == 1 && de->name[0] == '.' &&
+	    de->name[1] == '\0')
+		return 1;
+	if (len != de->name_len)
+		return 0;
+
+	for (i = 0; i < len; i++)
+		if ((de->name[i] ^ name[i]) & 0x5f)
+			return 0;
+	return 1;
+}
+
+static int adfs_find_entry (struct inode *dir, const char * const name, int namelen,
+			    struct adfs_idir_entry *ide)
+{
+	struct super_block *sb;
+	struct buffer_head *bh[4];
+	union  adfs_dirtail dt;
+	unsigned long parent_object_id, dir_object_id;
+	int buffers, pos;
+
+	if (!dir || !S_ISDIR(dir->i_mode))
+		return 0;
+
+	sb = dir->i_sb;
+
+	if (adfs_inode_validate (dir)) {
+		adfs_error (sb, "adfs_find_entry",
+			    "invalid inode number: %lu", dir->i_ino);
+		return 0;
+	}
+
+	if (namelen > ADFS_NAME_LEN)
+		return 0;
+
+	if (!(buffers = adfs_dir_read (dir, bh))) {
+		adfs_error (sb, "adfs_find_entry", "unable to read directory");
+		return 0;
+	}
+
+	if (adfs_dir_check (dir, bh, buffers, &dt)) {
+		adfs_dir_free (bh, buffers);
+		return 0;
+	}
+
+	parent_object_id = adfs_val (dt.new.dirparent, 3);
+	dir_object_id = adfs_inode_objid (dir);
+
+	if (namelen == 2 && name[0] == '.' && name[1] == '.') {
+		ide->name_len = 2;
+		ide->name[0] = ide->name[1] = '.';
+		ide->name[2] = '\0';
+		ide->inode_no = adfs_inode_generate (parent_object_id, 0);
+		adfs_dir_free (bh, buffers);
+		return 1;
+	}
+
+	pos = 5;
+
+	do {
+		if (!adfs_dir_get (sb, bh, buffers, pos, dir_object_id, ide))
+			break;
+
+		if (adfs_match (namelen, name, ide)) {
+			adfs_dir_free (bh, buffers);
+			return pos;
+		}
+		pos += 26;
+	} while (1);
+	adfs_dir_free (bh, buffers);
+	return 0;
+}
+
+int adfs_lookup (struct inode *dir, struct dentry *dentry)
+{
+	struct inode *inode = NULL;
+	struct adfs_idir_entry de;
+	unsigned long ino;
+
+	if (dentry->d_name.len > ADFS_NAME_LEN)
+		return -ENAMETOOLONG;
+
+	if (adfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de)) {
+		ino = de.inode_no;
+		inode = iget (dir->i_sb, ino);
+
+		if (!inode)
+			return -EACCES;
+	}
+	d_add(dentry, inode);
+	return 0;
+}