patch-2.1.70 linux/fs/coda/symlink.c

• Lines: 83
• Date: Tue Dec 2 14:24:04 1997
• Orig file: v2.1.69/linux/fs/coda/symlink.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.69/linux/fs/coda/symlink.c linux/fs/coda/symlink.c
@@ -0,0 +1,82 @@
+/*
+ * Symlink inode operations for Coda filesystem
+ * Original version: (C) 1996 P. Braam and M. Callahan
+ * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
+ * 
+ * Carnegie Mellon encourages users to contribute improvements to
+ * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/locks.h>
+#include <asm/segment.h>
+#include <asm/uaccess.h>
+#include <linux/string.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_cnode.h>
+#include <linux/coda_namecache.h>
+
+static int coda_readlink(struct inode *inode, char *buffer, int length);
+
+struct inode_operations coda_symlink_inode_operations = {
+	NULL,			/* no file-operations */
+	NULL,			/* create */
+	NULL,			/* lookup */
+	NULL,			/* link */
+	NULL,			/* unlink */
+	NULL,			/* symlink */
+	NULL,			/* mkdir */
+	NULL,			/* rmdir */
+	NULL,			/* mknod */
+	NULL,			/* rename */
+	coda_readlink,		/* readlink */
+	NULL,           	/* follow_link */
+	NULL,			/* readpage */
+	NULL,			/* writepage */
+	NULL,			/* bmap */
+	NULL,			/* truncate */
+	NULL,            	/* permission */
+	NULL,                   /* smap */
+	NULL,                   /* update page */
+        NULL                    /* revalidate */
+};
+
+static int coda_readlink(struct inode *inode, char *buffer, int length)
+{
+        int len;
+	int error;
+        char *buf;
+	struct cnode *cp;
+        ENTRY;
+
+        cp = ITOC(inode);
+        CHECK_CNODE(cp);
+
+        /* the maximum length we receive is len */
+        if ( length > CFS_MAXPATHLEN ) 
+	        len = CFS_MAXPATHLEN;
+	else
+	        len = length;
+	CODA_ALLOC(buf, char *, len);
+	if ( !buf ) 
+	        return -ENOMEM;
+	
+	error = venus_readlink(inode->i_sb, &(cp->c_fid), buf, &len);
+
+        CDEBUG(D_INODE, "result %s\n", buf);
+	if (! error) {
+		copy_to_user(buffer, buf, len);
+		put_user('\0', buffer + len);
+		error = len;
+		CODA_FREE(buf, len);
+	}
+	return error;
+}