1 files changed, 82 insertions, 0 deletions
diff --git a/fs/squashfs/symlink.c b/fs/squashfs/symlink.c
new file mode 100644
index 0000000000..40b9bdcc8b
--- /dev/null
+++ b/fs/squashfs/symlink.c
@@ -0,0 +1,82 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@squashfs.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * symlink.c
+ */
+
+/*
+ * This file implements code to handle symbolic links.
+ *
+ * The data contents of symbolic links are stored inside the symbolic
+ * link inode within the inode table.  This allows the normally small symbolic
+ * link to be compressed as part of the inode table, achieving much greater
+ * compression than if the symbolic link was compressed individually.
+ */
+
+#include <malloc.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/pagemap.h>
+
+#include "squashfs_fs.h"
+#include "squashfs_fs_sb.h"
+#include "squashfs_fs_i.h"
+#include "squashfs.h"
+
+static const char *squashfs_get_link(struct dentry *dentry, struct inode *inode)
+{
+	struct super_block *sb = inode->i_sb;
+	int index = 0;
+	u64 block = squashfs_i(inode)->start;
+	int offset = squashfs_i(inode)->offset;
+	int length = min_t(int, i_size_read(inode) - index, PAGE_SIZE);
+	int bytes;
+	unsigned char *symlink;
+
+	TRACE("Entered squashfs_symlink_readpage, start block "
+			"%llx, offset %x\n", block, offset);
+
+	symlink = malloc(length + 1);
+	if (!symlink)
+		return NULL;
+
+	symlink[length] = 0;
+
+	bytes = squashfs_read_metadata(sb, symlink, &block, &offset, length);
+	if (bytes < 0) {
+		ERROR("Unable to read symlink [%llx:%x]\n",
+			squashfs_i(inode)->start,
+			squashfs_i(inode)->offset);
+		goto error_out;
+	}
+
+	inode->i_link = symlink;
+
+	return inode->i_link;
+
+error_out:
+	free(symlink);
+
+	return NULL;
+}
+
+const struct inode_operations squashfs_symlink_inode_ops = {
+	.get_link = squashfs_get_link,
+};