From: Chuck Lever <cel@netapp.com>
Date: Mon, 20 Mar 2006 18:44:12 +0000 (-0500)
Subject: VFS: New /proc file /proc/self/mountstats
X-Git-Tag: v2.6.17-rc1~667^2~85
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b4629fe2f094b719847f31be1ee5ab38300038b2;p=pandora-kernel.git

VFS: New /proc file /proc/self/mountstats

Create a new file under /proc/self, called mountstats, where mounted file
systems can export information (configuration options, performance counters,
and so on).  Use a mechanism similar to /proc/mounts and s_ops->show_options.

This mechanism does not violate namespace security, and is safe to use while
other processes are unmounting file systems.

Thanks to Mike Waychison for his review and comments.

Test-plan:
Test concurrent mount/unmount operations while cat'ing /proc/self/mountstats.

Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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