Import of Linux/MIPS 2.1.36

1 files changed, 85 insertions, 0 deletions

diff --git a/fs/autofs/symlink.c b/fs/autofs/symlink.c
new file mode 100644
index 000000000..0e932c169
--- /dev/null
+++ b/fs/autofs/symlink.c
@@ -0,0 +1,85 @@
+/* -*- linux-c -*- --------------------------------------------------------- *
+ *
+ * linux/fs/autofs/symlink.c
+ *
+ *  Copyright 1997 Transmeta Corporation -- All Rights Reserved
+ *
+ * This file is part of the Linux kernel and is made available under
+ * the terms of the GNU General Public License, version 2, or at your
+ * option, any later version, incorporated herein by reference.
+ *
+ * ------------------------------------------------------------------------- */
+
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/auto_fs.h>
+
+static int autofs_follow_link(struct inode *dir, struct inode *inode,
+			      int flag, int mode, struct inode **res_inode)
+{
+	int error;
+	char *link;
+
+	*res_inode = NULL;
+	if (!dir) {
+		dir = current->fs->root;
+		dir->i_count++;
+	}
+	if (!inode) {
+		iput(dir);
+		return -ENOENT;
+	}
+	if (!S_ISLNK(inode->i_mode)) {
+		iput(dir);
+		*res_inode = inode;
+		return 0;
+	}
+	if (current->link_count > 5) {
+		iput(dir);
+		iput(inode);
+		return -ELOOP;
+	}
+	link = ((struct autofs_symlink *)inode->u.generic_ip)->data;
+	current->link_count++;
+	error = open_namei(link,flag,mode,res_inode,dir);
+	current->link_count--;
+	iput(inode);
+	return error;
+}
+
+static int autofs_readlink(struct inode *inode, char *buffer, int buflen)
+{
+	struct autofs_symlink *sl;
+	int len;
+
+	if (!S_ISLNK(inode->i_mode)) {
+		iput(inode);
+		return -EINVAL;
+	}
+	sl = (struct autofs_symlink *)inode->u.generic_ip;
+	len = sl->len;
+	if (len > buflen) len = buflen;
+	copy_to_user(buffer,sl->data,len);
+	iput(inode);
+	return len;
+}
+
+struct inode_operations autofs_symlink_inode_operations = {
+	NULL,			/* file operations */
+	NULL,			/* create */
+	NULL,			/* lookup */
+	NULL,			/* link */
+	NULL,			/* unlink */
+	NULL,			/* symlink */
+	NULL,			/* mkdir */
+	NULL,			/* rmdir */
+	NULL,			/* mknod */
+	NULL,			/* rename */
+	autofs_readlink,	/* readlink */
+	autofs_follow_link,	/* follow_link */
+	NULL,			/* readpage */
+	NULL,			/* writepage */
+	NULL,			/* bmap */
+	NULL,			/* truncate */
+	NULL			/* permission */
+};