From 705e2099473453b52983b8d4e8d9516cdee3fff7 Mon Sep 17 00:00:00 2001
From: vitaly <vitaly>
Date: Thu, 16 Nov 2006 10:54:39 +0000
Subject: [PATCH] Branch b_new_cmd b=11103

Do not let dentry to be unhashed after create,
some callers, e.g. do_coredump, expect it to be hashed.
---
 lustre/llite/namei.c   |  7 ++++++-
 lustre/tests/sanity.sh | 25 +++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/lustre/llite/namei.c b/lustre/llite/namei.c
index ac34532..6f4ef70 100644
--- a/lustre/llite/namei.c
+++ b/lustre/llite/namei.c
@@ -679,7 +679,12 @@ static int ll_create_it(struct inode *dir, struct dentry *dentry, int mode,
                 RETURN(PTR_ERR(inode));
         }
 
-        d_instantiate(dentry, inode);
+        /* Negative dentry may be unhashed if parent does not have UPDATE lock,
+         * but some callers, e.g. do_coredump, expect dentry to be hashed after
+         * successful create. Hash it here. */
+        spin_lock(&dcache_lock);
+        ll_d_add(dentry, inode);
+        spin_unlock(&dcache_lock);
         RETURN(0);
 }
 
diff --git a/lustre/tests/sanity.sh b/lustre/tests/sanity.sh
index f1edf2d..57183a4 100644
--- a/lustre/tests/sanity.sh
+++ b/lustre/tests/sanity.sh
@@ -3254,6 +3254,31 @@ test_104() {
 }
 run_test 104 "lfs df [-ih] [path] test ========================="
 
+test_107() {
+        CDIR=`pwd`
+        cd $DIR
+        ulimit -c unlimited
+        sleep 60 &
+        MULTIPID=$!
+        
+        file=`cat /proc/sys/kernel/core_pattern`
+        core_pid=`cat /proc/sys/kernel/core_uses_pid`
+        [ $core_pid -eq 1 ] && file=$file.$MULTIPID
+        rm -f $file
+        sleep 1
+
+        kill -s 11 $MULTIPID
+        wait $MULTIPID
+        if [ -e $file ]; then
+                size=`stat -c%s $file`
+                [ $size -eq 0 ] && error "Fail to create core file"
+        else
+                error "Fail to create core file"
+        fi
+        cd $CDIR
+}
+run_test 107 "Coredump on SIG"
+
 TMPDIR=$OLDTMPDIR
 TMP=$OLDTMP
 HOME=$OLDHOME
-- 
1.8.3.1