patch-1.3.94 linux/fs/affs/symlink.c

• Lines: 180
• Date: Sun Feb 25 19:14:29 1996
• Orig file: v1.3.93/linux/fs/affs/symlink.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/fs/affs/symlink.c linux/fs/affs/symlink.c
@@ -0,0 +1,179 @@
+/*
+ *  linux/fs/affs/symlink.c
+ *
+ *  (C) 1995  Joerg Dorchain Modified for Amiga FFS filesystem
+ *            based on:
+ *
+ *  (C) 1992  Eric Youngdale Modified for ISO9660 filesystem.
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  isofs symlink handling code.  This is only used with the Rock Ridge
+ *  extensions to iso9660
+ */
+
+#include <asm/segment.h>
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/malloc.h>
+#include <linux/affs_fs.h>
+
+#include "amigaffs.h"
+
+static int affs_readlink(struct inode *, char *, int);
+static int affs_follow_link(struct inode *, struct inode *, int, int, struct inode **);
+
+/*
+ * symlinks can't do much...
+ */
+struct inode_operations affs_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 */
+	affs_readlink,		/* readlink */
+	affs_follow_link,	/* follow_link */
+	NULL,			/* bmap */
+	NULL,			/* truncate */
+	NULL			/* permission */
+};
+
+static int affs_follow_link(struct inode * dir, struct inode * inode,
+	int flag, int mode, struct inode ** res_inode)
+{
+	int error;
+	char * pnt;
+	struct buffer_head *bh;
+	struct symlink_front *sy_data;
+
+	if (!dir) {
+		dir = current->fs->root;
+		dir->i_count++;
+	}
+	if (!inode) {
+		iput(dir);
+		*res_inode = NULL;
+		return -ENOENT;
+	}
+	if (!S_ISLNK(inode->i_mode)) {
+		iput(dir);
+		*res_inode = inode;
+		return 0;
+	}
+	if (current->link_count > 5) {
+		iput(dir);
+		iput(inode);
+		*res_inode = NULL;
+		return -ELOOP;
+	}
+	if (!(bh = affs_pread(inode,inode->i_ino,(void **)&sy_data))) {
+		printk("affs: unable to read block %ld",inode->i_ino);
+		return 0;
+	}
+
+	pnt = sy_data->symname;
+	iput(inode);
+	current->link_count++;
+	error = open_namei(pnt,flag,mode,res_inode,dir);
+	current->link_count--;
+	brelse(bh);
+	return error;
+}
+
+static char *affs_conv_path(char *affs_path)
+{
+static char unix_path[1024]="/";
+int up,ap;
+char dp,slash;
+
+
+dp=1;
+slash=1;
+ap=0;
+up=1;
+if (affs_path[0] == 0)
+  unix_path[up++]='.';
+while ((up < 1020) && (affs_path[ap]!=0))
+ {
+  switch (affs_path[ap]) {
+    case ':':
+      if (dp == 0) {
+        slash=0;
+        unix_path[up++]=':';
+      }
+      else {
+        dp=0;
+        slash=1;
+        unix_path[up++]='/';
+      }
+      break;
+    case '/':
+      if (slash==0) {
+        slash=1;
+        unix_path[up++]='/';
+      }
+      else {
+        unix_path[up++]='.';
+        unix_path[up++]='.';
+        unix_path[up++]='/';
+      }
+      break;
+    default:
+      slash=0;
+      unix_path[up++]=affs_path[ap];
+      break;
+  }
+  ap++;
+ }
+unix_path[up]=0;
+return unix_path+dp;
+}
+
+
+static int affs_readlink(struct inode * inode, char * buffer, int buflen)
+{
+        char * pnt;
+	int i;
+	char c;
+	struct buffer_head *bh;
+	struct symlink_front *sy_data;
+
+	if (!S_ISLNK(inode->i_mode)) {
+		iput(inode);
+		return -EINVAL;
+	}
+
+	if (buflen > 1023)
+		buflen = 1023;
+	
+	if (!(bh = affs_pread(inode,inode->i_ino,(void **)&sy_data))) {
+		printk("affs: unable to read block %ld\n",inode->i_ino);
+		return -ENOENT;
+	}
+	
+	iput(inode);
+
+	pnt = sy_data->symname;
+	if (inode->i_sb->u.affs_sb.s_options.conv_links != 0)
+	  pnt = affs_conv_path(pnt);
+
+	i = 0;
+
+	while (i<buflen && (c = pnt[i])) {
+		i++;
+		put_fs_byte(c,buffer++);
+	}
+	
+	brelse(bh);
+
+	return i;
+}