From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Tue, 9 Apr 2013 01:49:53 +0000 (-0400)
Subject: NFS: Ensure that NFS file unlock waits for readahead to complete
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=7a8203d8cbab63b7c556ebd00e12685a3ed176b5;p=openwrt%2Fstaging%2Fblogic.git

NFS: Ensure that NFS file unlock waits for readahead to complete

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 29f4a48a0ee6..a87a44f84113 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -744,6 +744,7 @@ static int
 do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
 {
 	struct inode *inode = filp->f_mapping->host;
+	struct nfs_lock_context *l_ctx;
 	int status;
 
 	/*
@@ -752,6 +753,14 @@ do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
 	 */
 	nfs_sync_mapping(filp->f_mapping);
 
+	l_ctx = nfs_get_lock_context(nfs_file_open_context(filp));
+	if (!IS_ERR(l_ctx)) {
+		status = nfs_iocounter_wait(&l_ctx->io_count);
+		nfs_put_lock_context(l_ctx);
+		if (status < 0)
+			return status;
+	}
+
 	/* NOTE: special case
 	 * 	If we're signalled while cleaning up locks on process exit, we
 	 * 	still need to complete the unlock.