linux-kernel - [PATCH 1/2] proc: Add struct mount & struct super

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Message-Id: <af4d266dd2d6b45403feca45395e3146a6f497cd.1597721575.git.riteshh@linux.ibm.com>
Date:   Tue, 18 Aug 2020 09:34:30 +0530
From:   Ritesh Harjani <riteshh@...ux.ibm.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>,
        Kieran Bingham <kbingham@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Ritesh Harjani <riteshh@...ux.ibm.com>
Subject: [PATCH 1/2] proc: Add struct mount & struct super_block addr in lx-mounts command

This is many times found useful while debugging some FS related issue.

<e.g. output>
      mount          super_block      fstype devname pathname options
0xffff888a0bfa4b40 0xffff888a0bfc1000 rootfs none / rw   0 0
0xffff888a02c065c0 0xffff8889fcf65000 ext4 /dev/root / rw  ,relatime 0 0
0xffff8889fc8cc040 0xffff888a0bb51000 devtmpfs devtmpfs /dev rw  ,relatime 0 0

Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>
---
 scripts/gdb/linux/proc.py | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py
index 6a56bba233a9..c16fab981bdd 100644
--- a/scripts/gdb/linux/proc.py
+++ b/scripts/gdb/linux/proc.py
@@ -167,6 +167,9 @@ values of that process namespace"""
         if not namespace:
             raise gdb.GdbError("No namespace for current process")
 
+        gdb.write("{:^18} {:^15} {:>9} {} {} options\n".format(
+                  "mount", "super_block", "fstype", "devname", "pathname"))
+
         for vfs in lists.list_for_each_entry(namespace['list'],
                                              mount_ptr_type, "mnt_list"):
             devname = vfs['mnt_devname'].string()
@@ -190,14 +193,10 @@ values of that process namespace"""
             m_flags = int(vfs['mnt']['mnt_flags'])
             rd = "ro" if (s_flags & constants.LX_SB_RDONLY) else "rw"
 
-            gdb.write(
-                "{} {} {} {}{}{} 0 0\n"
-                .format(devname,
-                        pathname,
-                        fstype,
-                        rd,
-                        info_opts(FS_INFO, s_flags),
-                        info_opts(MNT_INFO, m_flags)))
+            gdb.write("{} {} {} {} {} {} {} {} 0 0\n".format(
+                      vfs.format_string(), superblock.format_string(), fstype,
+                      devname, pathname, rd, info_opts(FS_INFO, s_flags),
+                      info_opts(MNT_INFO, m_flags)))
 
 
 LxMounts()
-- 
2.25.4