linux-kernel - [PATCH] isofs: Fix lseek() to position beyond 4 GB

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Message-ID: <20100803211814.GA4436@pitr.home.jan>
Date:	Tue, 3 Aug 2010 23:18:16 +0200
From:	Jan Andres <jandres@....net>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org
Subject: [PATCH] isofs: Fix lseek() to position beyond 4 GB

isofs supports files larger than 4 GB by using multi-extent files.
However an lseek() to a position beyond 4 GB in such a file will
fail with EINVAL, because s_maxbytes in the isofs superblock is
initialized to 2^32-1, and generic_file_llseek() checks against
that value.

I therefore suggest increasing the value of s_maxbytes to have
full support for large files in isofs. With multi-extent files, file
size is only limited by the maximum size of the file system (8 TB),
so this seems a reasonable value for s_maxbytes.

Signed-off-by: Jan Andres <jandres@....net>

--- linux-2.6.35-j7/fs/isofs/inode.c.orig	2010-08-02 00:11:14.000000000 +0200
+++ linux-2.6.35-j7/fs/isofs/inode.c	2010-08-03 22:54:38.000000000 +0200
@@ -722,7 +722,12 @@ root_found:
 	}

 	s->s_magic = ISOFS_SUPER_MAGIC;
-	s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
+
+	/*
+	 * With multi-extent files, file size is only limited by the maximum
+	 * size of a file system, which is 8 TB.
+	 */
+	s->s_maxbytes = 0x80000000000;

 	/*
 	 * The CDROM is read-only, has no nodes (devices) on it, and since
--
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