From 75caeecdf9c7151af5f7d972e2dabbff1bef30a7 Mon Sep 17 00:00:00 2001
From: Maxim Patlasov <MPatlasov@parallels.com>
Date: Mon, 28 Apr 2014 14:19:22 +0200
Subject: [PATCH] fuse: update mtime on open(O_TRUNC) in atomic_o_trunc mode

In case of fc->atomic_o_trunc is set, fuse does nothing in
fuse_do_setattr() while handling open(O_TRUNC). Hence, i_mtime must be
updated explicitly in fuse_finish_open(). The patch also adds extra locking
encompassing open(O_TRUNC) operation to avoid races between the truncation
and updating i_mtime.

Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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