LU-12511 llite: fix misuse of current->parent.

current->parent is used by ptrace to redirect some signal delivery
to the ptracer.  It should only be used by 'ptrace' or 'signal' code.
All other users should  use current->real_parent, which is the real
parent.

Change-Id: I3212fd9f3db9935b8144dba8af82eb2f387a5c45
Signed-off-by: Mr. NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-on: https://review.whamcloud.com/45580
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>

diff --git a/lustre/llite/lproc_llite.c b/lustre/llite/lproc_llite.c
index e17effd..4b4d270 100644 (file)
--- a/lustre/llite/lproc_llite.c
+++ b/lustre/llite/lproc_llite.c
@@ -1768,7 +1768,7 @@ void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, long count)
                 sbi->ll_stats_track_id == current->pid)
                lprocfs_counter_add(sbi->ll_stats, op, count);
        else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
                 sbi->ll_stats_track_id == current->pid)
                lprocfs_counter_add(sbi->ll_stats, op, count);
        else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&

-                sbi->ll_stats_track_id == current->parent->pid)
+                sbi->ll_stats_track_id == current->real_parent->pid)

                lprocfs_counter_add(sbi->ll_stats, op, count);
        else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
                 sbi->ll_stats_track_id ==
                lprocfs_counter_add(sbi->ll_stats, op, count);
        else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
                 sbi->ll_stats_track_id ==