From: Dave Hansen <haveblue@us.ibm.com>
Date: Fri, 15 Feb 2008 22:37:30 +0000 (-0800)
Subject: [PATCH] r/o bind mounts: stub functions
X-Git-Tag: v2.6.26-rc1~1134^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8366025eb80dfa0d8d94b286d53027081c280ef1;p=pandora-kernel.git

[PATCH] r/o bind mounts: stub functions

This patch adds two function mnt_want_write() and mnt_drop_write().  These are
used like a lock pair around and fs operations that might cause a write to the
filesystem.

Before these can become useful, we must first cover each place in the VFS
where writes are performed with a want/drop pair.  When that is complete, we
can actually introduce code that will safely check the counts before allowing
r/w<->r/o transitions to occur.

Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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