From: Boaz Harrosh <bharrosh@panasas.com>
Date: Wed, 25 Jan 2012 19:42:58 +0000 (+0200)
Subject: osd_uld: Bump MAX_OSD_DEVICES from 64 to 1,048,576
X-Git-Tag: v3.2.10~54
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65088b82b22e2dddc522338a6b075b000a0d0d1c;p=pandora-kernel.git

osd_uld: Bump MAX_OSD_DEVICES from 64 to 1,048,576

commit 41f8ad76362e7aefe3a03949c43e23102dae6e0b upstream.

It used to be that minors where 8 bit. But now they
are actually 20 bit. So the fix is simplicity itself.

I've tested with 300 devices and all user-mode utils
work just fine. I have also mechanically added 10,000
to the ida (so devices are /dev/osd10000, /dev/osd10001 ...)
and was able to mkfs an exofs filesystem and access osds
from user-mode.

All the open-osd user-mode code uses the same library
to access devices through their symbolic names in
/dev/osdX so I'd say it's pretty safe. (Well tested)

This patch is very important because some of the systems
that will be deploying the 3.2 pnfs-objects code are larger
than 64 OSDs and will stop to work properly when reaching
that number.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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