linux-kernel - [PATCH 02/15] osst: Use noop_llseek() instead of default

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Date:	Fri, 20 Nov 2009 17:40:32 +0100
From:	Jan Blunck <jblunck@...e.de>
To:	linux-fsdevel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, jkacur@...hat.com,
	Arnd Bergmann <arnd@...db.de>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Jamie Lokier <jamie@...reable.org>,
	Jan Blunck <jblunck@...e.de>, Willem Riede <osst@...de.org>,
	"James E.J. Bottomley" <James.Bottomley@...e.de>
Subject: [PATCH 02/15] osst: Use noop_llseek() instead of default_llseek()

__os_scsi_tape_open() suggests that llseek() doesn't work:
"We really want to do nonseekable_open(inode, filp); here, but some
 versions of tar incorrectly call lseek on tapes and bail out if that
 fails.  So we disallow pread() and pwrite(), but permit lseeks."

Instead of using the fallback default_llseek() the driver should use
noop_llseek() which leaves the file->f_pos untouched but succeeds.

Signed-off-by: Jan Blunck <jblunck@...e.de>
---
 drivers/scsi/osst.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c
index acb8358..761ca9d 100644
--- a/drivers/scsi/osst.c
+++ b/drivers/scsi/osst.c
@@ -5619,6 +5619,7 @@ static const struct file_operations osst_fops = {
 	.open =         os_scsi_tape_open,
 	.flush =        os_scsi_tape_flush,
 	.release =      os_scsi_tape_close,
+	.llseek =	noop_llseek,
 };
 
 static int osst_supports(struct scsi_device * SDp)
-- 
1.6.4.2

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