patch-2.1.43 linux/fs/proc/arbitrary.c

• Lines: 59
• Date: Thu Jun 12 16:22:09 1997
• Orig file: v2.1.42/linux/fs/proc/arbitrary.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.42/linux/fs/proc/arbitrary.c linux/fs/proc/arbitrary.c
@@ -0,0 +1,58 @@
+/*
+ * $Id: arbitrary.c,v 1.2 1997/06/05 01:27:47 davem Exp $
+ *
+ * linux/fs/proc/arbitrary.c - lookup() for arbitrary inodes.
+ * Copyright (C) 1997, Thomas Schoebel-Theuer,
+ * <schoebel@informatik.uni-stuttgart.de>.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/kdev_t.h>
+#include <linux/fs.h>
+
+/* Format of dev/inode pairs that can be used as file names:
+ * [<dev_number_in_hex]:<inode_number_in_decimal>
+ * (the same format that is already in use in /proc/<pid>/exe,
+ * /proc/<pid>/cwd and /proc/<pid>/root).
+ */
+/* Note that readdir does not supply such names, so they must be used
+ * either "blind" or must be queried another way, for example
+ * as result of a virtual symlink (see linux/proc/link.c).
+ */
+int proc_arbitrary_lookup(struct inode * dir, const char * name,
+			  int len, struct inode ** result)
+{
+	int dev, ino;
+	char * ptr = (char*)name;
+	kdev_t kdev;
+	int i;
+	int error = -EINVAL;
+	
+	if(*ptr++ != '[')
+		goto done;
+	dev = simple_strtoul(ptr, &ptr, 16);
+	if(*ptr++ != ']')
+		goto done;
+	if(*ptr++ != ':')
+		goto done;
+	ino = simple_strtoul(ptr, &ptr, 0);
+	if((long)ptr - (long)name != len)
+		goto done;
+
+	error = -ENOENT;
+	kdev = to_kdev_t(dev);
+	if(!kdev)
+		goto done;
+	for(i = 0; i < NR_SUPER; i++)
+		if(super_blocks[i].s_dev == kdev)
+			break;
+	if(i < NR_SUPER) {
+		*result = iget(&super_blocks[i], ino);
+		if(*result)
+			error = 0;
+	}
+done:
+	iput(dir);
+	return error;
+}