tree 052c9244cd9d763ad8467bb95b25d903d58b7f11
parent a70e65df8812c52252fa07a2eb92a46451a4427f
author Dave Hansen <haveblue@us.ibm.com> 1203115050 -0800
committer Al Viro <viro@zeniv.linux.org.uk> 1208579132 -0400

[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>