From: Peng Tao <tao.peng@primarydata.com>
Date: Tue, 23 Jun 2015 11:52:03 +0000 (+0800)
Subject: nfs42: serialize LAYOUTSTATS calls of the same file
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~39^2~14^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1bfe3b259ff2e579b2acb190f874397d53274497;p=pandora-kernel.git

nfs42: serialize LAYOUTSTATS calls of the same file

There is no need to report concurrently.

Reviewed-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
---

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index ee0248340a42..06c74cd93875 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -204,6 +204,9 @@ nfs42_layoutstat_release(void *calldata)
 		nfss->pnfs_curr_ld->cleanup_layoutstats(data);
 
 	pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
+	smp_mb__before_atomic();
+	clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
+	smp_mb__after_atomic();
 	nfs_iput_and_deactive(data->inode);
 	kfree(data->args.devinfo);
 	kfree(data);
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