From: Mikulas Patocka <mpatocka@redhat.com>
Date: Mon, 16 Mar 2009 17:44:30 +0000 (+0000)
Subject: dm io: respect BIO_MAX_PAGES limit
X-Git-Tag: v2.6.27.21~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49838e7c80ce1bf98ac567c5b7131ac9992b5043;p=pandora-kernel.git

dm io: respect BIO_MAX_PAGES limit

commit d659e6cc98766a1a61d6bdd283f95d149abd7719 upstream.

dm-io calls bio_get_nr_vecs to get the maximum number of pages to use
for a given device.  It allocates one additional bio_vec to use
internally but failed to respect BIO_MAX_PAGES, so fix this.

This was the likely cause of:
  https://bugzilla.redhat.com/show_bug.cgi?id=173153

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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