From: Jackie Liu liuyun01@kylinos.cn Subject: scripts/gdb: replace flags (MS_xyz -> SB_xyz)

Since 1751e8a6cb93 ("Rename superblock flags (MS_xyz -> SB_xyz)"), scripts/gdb should be updated to replace MS_xyz with SB_xyz.

This change didn't directly affect the running operation of scripts/gdb until e262e32d6bde "vfs: Suppress MS_* flag defs within the kernel unless explicitly enabled" removed the definitions used by constants.py.

Update constants.py.in to utilise the new internal flags, matching the implementation at fs/proc_namespace.c::show_sb_opts.

Note to stable, e262e32d6bde landed in v5.0-rc1 (which was just released), so we'll want this picked back to 5.0 stable once this patch hits mainline (akpm just picked it up). Without this, debugging a kernel a kernel via GDB+QEMU is broken in the 5.0 release.

[kieran.bingham@ideasonboard.com: add fixes tag, reword commit message] Link: http://lkml.kernel.org/r/20190305103014.25847-1-kieran.bingham@ideasonboard.... Fixes: e262e32d6bde "vfs: Suppress MS_* flag defs within the kernel unless explicitly enabled" Signed-off-by: Jackie Liu liuyun01@kylinos.cn Signed-off-by: Kieran Bingham kieran.bingham@ideasonboard.com Tested-by: Nick Desaulniers ndesaulniers@google.com Tested-by: Kieran Bingham kieran.bingham@ideasonboard.com Cc: Felipe Balbi felipe.balbi@linux.intel.com Cc: Dan Robertson danlrobertson89@gmail.com Cc: Jan Kiszka jan.kiszka@siemens.com Cc: David Howells dhowells@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

--- a/scripts/gdb/linux/constants.py.in~scripts-gdb-replace-flags-ms_xyz-sb_xyz +++ a/scripts/gdb/linux/constants.py.in @@ -37,12 +37,12 @@ import gdb

/* linux/fs.h */ -LX_VALUE(MS_RDONLY) -LX_VALUE(MS_SYNCHRONOUS) -LX_VALUE(MS_MANDLOCK) -LX_VALUE(MS_DIRSYNC) -LX_VALUE(MS_NOATIME) -LX_VALUE(MS_NODIRATIME) +LX_VALUE(SB_RDONLY) +LX_VALUE(SB_SYNCHRONOUS) +LX_VALUE(SB_MANDLOCK) +LX_VALUE(SB_DIRSYNC) +LX_VALUE(SB_NOATIME) +LX_VALUE(SB_NODIRATIME)

/* linux/mount.h */ LX_VALUE(MNT_NOSUID) --- a/scripts/gdb/linux/proc.py~scripts-gdb-replace-flags-ms_xyz-sb_xyz +++ a/scripts/gdb/linux/proc.py @@ -114,11 +114,11 @@ def info_opts(lst, opt): return opts

-FS_INFO = {constants.LX_MS_SYNCHRONOUS: ",sync", - constants.LX_MS_MANDLOCK: ",mand", - constants.LX_MS_DIRSYNC: ",dirsync", - constants.LX_MS_NOATIME: ",noatime", - constants.LX_MS_NODIRATIME: ",nodiratime"} +FS_INFO = {constants.LX_SB_SYNCHRONOUS: ",sync", + constants.LX_SB_MANDLOCK: ",mand", + constants.LX_SB_DIRSYNC: ",dirsync", + constants.LX_SB_NOATIME: ",noatime", + constants.LX_SB_NODIRATIME: ",nodiratime"}

MNT_INFO = {constants.LX_MNT_NOSUID: ",nosuid", constants.LX_MNT_NODEV: ",nodev", @@ -184,7 +184,7 @@ values of that process namespace""" fstype = superblock['s_type']['name'].string() s_flags = int(superblock['s_flags']) m_flags = int(vfs['mnt']['mnt_flags']) - rd = "ro" if (s_flags & constants.LX_MS_RDONLY) else "rw" + rd = "ro" if (s_flags & constants.LX_SB_RDONLY) else "rw"

gdb.write( "{} {} {} {}{}{} 0 0\n" _