linux-kernel - [PATCH 24/29] staging: lustre: ptlrpc: Forbid too early NRS policy tunings

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Date:   Thu, 27 Oct 2016 18:11:58 -0400
From:   James Simmons <jsimmons@...radead.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Andreas Dilger <andreas.dilger@...el.com>,
        Oleg Drokin <oleg.drokin@...el.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>,
        Henri Doreau <henri.doreau@....fr>,
        James Simmons <jsimmons@...radead.org>
Subject: [PATCH 24/29] staging: lustre: ptlrpc: Forbid too early NRS policy tunings

From: Henri Doreau <henri.doreau@....fr>

Wait for a NRS policy to be fully started before allowing
to apply related tunings, so that all fields are properly
initialized.

Signed-off-by: Henri Doreau <henri.doreau@....fr>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6673
Reviewed-on: http://review.whamcloud.com/15104
Reviewed-by: Emoly Liu <emoly.liu@...el.com>
Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>
Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
Signed-off-by: James Simmons <jsimmons@...radead.org>
---
 drivers/staging/lustre/lustre/ptlrpc/nrs.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/lustre/lustre/ptlrpc/nrs.c b/drivers/staging/lustre/lustre/ptlrpc/nrs.c
index d88faf6..f856632 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/nrs.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/nrs.c
@@ -619,6 +619,15 @@ static int nrs_policy_ctl(struct ptlrpc_nrs *nrs, char *name,
 		goto out;
 	}
 
+	/**
+	 * Wait for the policy to be fully started before attempting
+	 * to operate it.
+	 */
+	if (policy->pol_state == NRS_POL_STATE_STARTING) {
+		rc = -EAGAIN;
+		goto out;
+	}
+
 	switch (opc) {
 		/**
 		 * Unknown opcode, pass it down to the policy-specific control
-- 
1.7.1