linux-kernel - [PATCH 1/2] NBD: set uninitialized devices to size 0

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Date:	Fri, 24 Aug 2007 13:06:39 -0400
From:	Paul Clements <paul.clements@...eleye.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
CC:	david@...eaves.com, Wouter Verhelst <w@...r.be>,
	Corey Minyard <cminyard@...sta.com>
Subject: [PATCH 1/2] NBD: set uninitialized devices to size 0

This fixes errors with utilities (such as LVM's vgscan) that try to scan 
all devices. Previously this would generate read errors when 
uninitialized nbd devices were scanned:

# vgscan
   Reading all physical volumes.  This may take a while...
   /dev/nbd0: read failed after 0 of 1024 at 0: Input/output error
   /dev/nbd0: read failed after 0 of 1024 at 509804544: Input/output error
   /dev/nbd0: read failed after 0 of 2048 at 0: Input/output error
   /dev/nbd1: read failed after 0 of 1024 at 509804544: Input/output error
   /dev/nbd1: read failed after 0 of 2048 at 0: Input/output error

 From now on, uninitialized nbd devices will have size zero, which 
prevents these errors.

Patch applies and was tested against 2.6.23-rc2-mm2.

Thanks,
Paul

View attachment "nbd_size_zero.diff" of type "text/x-patch" (1069 bytes)