From 5ea8210977958fa102baf3ed8450ca962cabcf25 Mon Sep 17 00:00:00 2001
From: "Alexander.Boyko" <alexander_boyko@xyratex.com>
Date: Mon, 27 May 2013 12:25:51 +0400
Subject: [PATCH 1/1] LU-3240 mdc: Check for all attributes validity in
 revalidate

GETATTR needs to return attributes protected by different bits, so
we need to ensure all we have locks with all of those bits, not
just UPDATE bit.

Xyratex-bug-id: MRP-1052
Signed-off-by: Alexey Lyashkov <alexey_lyashkov@xyratex.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Change-Id: I0e27a33341c424a8666bdbf3cdb83b1b4fe0058f
Reviewed-on: http://review.whamcloud.com/6460
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: wangdi <di.wang@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
---
 lustre/mdc/mdc_locks.c | 20 +++++++++++++++++---
 lustre/tests/sanity.sh | 20 ++++++++++++++++++++
 2 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/lustre/mdc/mdc_locks.c b/lustre/mdc/mdc_locks.c
index 65224af..1a71afb 100644
--- a/lustre/mdc/mdc_locks.c
+++ b/lustre/mdc/mdc_locks.c
@@ -1084,9 +1084,22 @@ int mdc_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
         } else {
                 fid_build_reg_res_name(fid, &res_id);
                 switch (it->it_op) {
-                case IT_GETATTR:
-                        policy.l_inodebits.bits = MDS_INODELOCK_UPDATE;
-                        break;
+		case IT_GETATTR:
+			/* File attributes are held under multiple bits:
+			 * nlink is under lookup lock, size and times are
+			 * under UPDATE lock and recently we've also got
+			 * a separate permissions lock for owner/group/acl that
+			 * were protected by lookup lock before.
+			 * Getattr must provide all of that information,
+			 * so we need to ensure we have all of those locks.
+			 * Unfortunately, if the bits are split across multiple
+			 * locks, there's no easy way to match all of them here,
+			 * so an extra RPC would be performed to fetch all
+			 * of those bits at once for now. */
+			policy.l_inodebits.bits = MDS_INODELOCK_UPDATE |
+						  MDS_INODELOCK_LOOKUP |
+						  MDS_INODELOCK_PERM;
+			break;
                 case IT_LAYOUT:
                         policy.l_inodebits.bits = MDS_INODELOCK_LAYOUT;
                         break;
@@ -1094,6 +1107,7 @@ int mdc_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
                         policy.l_inodebits.bits = MDS_INODELOCK_LOOKUP;
                         break;
                 }
+
                 mode = ldlm_lock_match(exp->exp_obd->obd_namespace,
                                        LDLM_FL_BLOCK_GRANTED, &res_id,
                                        LDLM_IBITS, &policy,
diff --git a/lustre/tests/sanity.sh b/lustre/tests/sanity.sh
index 7d21b74..fc42bc0 100644
--- a/lustre/tests/sanity.sh
+++ b/lustre/tests/sanity.sh
@@ -3127,6 +3127,26 @@ test_39n() { # LU-3832
 }
 run_test 39n "check that O_NOATIME is honored"
 
+test_39o() {
+	TESTDIR=$DIR/$tdir/$tfile
+	[ -e $TESTDIR ] && rm -rf $TESTDIR
+	mkdir -p $TESTDIR
+	cd $TESTDIR
+	links1=2
+	ls
+	mkdir a b
+	ls
+	links2=$(stat -c %h .)
+	[ $(($links1 + 2)) != $links2 ] &&
+		error "wrong links count $(($links1 + 2)) != $links2"
+	rmdir b
+	links3=$(stat -c %h .)
+	[ $(($links1 + 1)) != $links3 ] &&
+		error "wrong links count $links1 != $links3"
+	return 0
+}
+run_test 39o "directory cached attributes updated after create ========"
+
 test_40() {
 	dd if=/dev/zero of=$DIR/$tfile bs=4096 count=1
 	$RUNAS $OPENFILE -f O_WRONLY:O_TRUNC $DIR/$tfile &&
-- 
1.8.3.1