From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Thu, 26 Feb 2015 22:42:42 +0000 (-0500)
Subject: NFS: Add a helper to set attribute barriers
X-Git-Tag: omap-for-v4.1/wl12xx-dt~60^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=140e049c64ce848392adbf4678983ecc76888dde;p=pandora-kernel.git

NFS: Add a helper to set attribute barriers

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Tested-by: Chuck Lever <chuck.lever@oracle.com>
---

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 83107be3dd01..b0cbc1ba82da 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1260,6 +1260,22 @@ void nfs_fattr_init(struct nfs_fattr *fattr)
 }
 EXPORT_SYMBOL_GPL(nfs_fattr_init);
 
+/**
+ * nfs_fattr_set_barrier
+ * @fattr: attributes
+ *
+ * Used to set a barrier after an attribute was updated. This
+ * barrier ensures that older attributes from RPC calls that may
+ * have raced with our update cannot clobber these new values.
+ * Note that you are still responsible for ensuring that other
+ * operations which change the attribute on the server do not
+ * collide.
+ */
+void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
+{
+	fattr->gencount = nfs_inc_attr_generation_counter();
+}
+
 struct nfs_fattr *nfs_alloc_fattr(void)
 {
 	struct nfs_fattr *fattr;
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