From 9c4641f42bbecf63ec0a0e05caacbccd5332b831 Mon Sep 17 00:00:00 2001
From: Philipp Thomas <pth@suse.de>
Date: Sun, 26 Mar 2017 22:34:00 -0700
Subject: [PATCH 1/2] df: avoid querying excluded file systems

* src/df.c (filter_mount_list): Avoid stat() on
explicitly excluded file systems, which is especially
significant in cases like `-x nfs` which may hang.
* NEWS: Mention the bug fix.

Upstream-commit: 7c228bc55ed3fd6d56a6ad135438066de2f54a30
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
 src/df.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/df.c b/src/df.c
index 5b9e8fd..e0ebed7 100644
--- a/src/df.c
+++ b/src/df.c
@@ -632,9 +632,11 @@ filter_mount_list (bool devices_only)
          On Linux we probably have me_dev populated from /proc/self/mountinfo,
          however we still stat() in case another device was mounted later.  */
       if ((me->me_remote && show_local_fs)
+          || (!selected_fstype (me->me_type) || excluded_fstype (me->me_type))
           || -1 == stat (me->me_mountdir, &buf))
         {
-          /* If remote, and showing just local, add ME for filtering later.
+          /* If remote, and showing just local, or FS type is excluded,
+             add ME for filtering later.
              If stat failed; add ME to be able to complain about it later.  */
           buf.st_dev = me->me_dev;
         }
-- 
2.13.6


From a4a61effe74766cdf047d6af52cf63613057bd87 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Thu, 23 Nov 2017 17:30:09 +0100
Subject: [PATCH 2/2] df: limit the stat() call optimization for dummy file
 systems only

Otherwise 'df -t rootfs' mistakenly shows a dummy file system without
using the -a option, because the dummy file system is shadowed by the
actual root file system entry, for which we optimize out the stat()
call.

The problem fixed by this patch is not observable on Fedora because
/proc/self/mountinfo (which we do not use on RHEL) does not contain
the rootfs mount entry.
---
 src/df.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/df.c b/src/df.c
index adade6d..4c6131e 100644
--- a/src/df.c
+++ b/src/df.c
@@ -632,7 +632,8 @@ filter_mount_list (bool devices_only)
          On Linux we probably have me_dev populated from /proc/self/mountinfo,
          however we still stat() in case another device was mounted later.  */
       if ((me->me_remote && show_local_fs)
-          || (!selected_fstype (me->me_type) || excluded_fstype (me->me_type))
+          || (me->me_dummy && (excluded_fstype (me->me_type)
+              || !selected_fstype (me->me_type)))
           || -1 == stat (me->me_mountdir, &buf))
         {
           /* If remote, and showing just local, or FS type is excluded,
-- 
2.13.6