[Cluster-devel] [GFS2 Patch] bz458289: rm on multiple nodes causes panic

[Bob Peterson <rpeterso@redhat.com>]

This patch fixes a problem whereby simultaneous delete operations
(e.g. rm -fR *) from multiple nodes on the same GFS2 file system
can cause kernel panics, hangs, and/or memory corruption.

Regards,

Bob Peterson

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
--
 fs/gfs2/ops_inode.c |   24 ++++++------------------
 1 files changed, 6 insertions(+), 18 deletions(-)

diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index e2c62f7..a072c9a 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -288,25 +288,17 @@ static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 	gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 
 
-	error = gfs2_glock_nq(ghs); /* parent */
-	if (error)
-		goto out_parent;
-
-	error = gfs2_glock_nq(ghs + 1); /* child */
-	if (error)
-		goto out_child;
-
-	error = gfs2_glock_nq(ghs + 2); /* rgrp */
+	error = gfs2_glock_nq_m(3, ghs);
 	if (error)
-		goto out_rgrp;
+		goto out;
 
 	error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 	if (error)
-		goto out_rgrp;
+		goto out;
 
 	error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
 	if (error)
-		goto out_rgrp;
+		goto out;
 
 	error = gfs2_dir_del(dip, &dentry->d_name);
         if (error)
@@ -316,14 +308,10 @@ static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 
 out_end_trans:
 	gfs2_trans_end(sdp);
-	gfs2_glock_dq(ghs + 2);
-out_rgrp:
+out:
+	gfs2_glock_dq_m(3, ghs);
 	gfs2_holder_uninit(ghs + 2);
-	gfs2_glock_dq(ghs + 1);
-out_child:
 	gfs2_holder_uninit(ghs + 1);
-	gfs2_glock_dq(ghs);
-out_parent:
 	gfs2_holder_uninit(ghs);
 	gfs2_glock_dq_uninit(&ri_gh);
 	return error;