From: akpm@linux-foundation.org
To: kieran.bingham@linaro.org, jan.kiszka@siemens.com,
mm-commits@vger.kernel.org
Subject: + scripts-gdb-add-mount-point-list-command.patch added to -mm tree
Date: Tue, 10 May 2016 12:34:30 -0700 [thread overview]
Message-ID: <573237c6.eKcnYCUi3rLcrqgN%akpm@linux-foundation.org> (raw)
The patch titled
Subject: scripts/gdb: add mount point list command
has been added to the -mm tree. Its filename is
scripts-gdb-add-mount-point-list-command.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/scripts-gdb-add-mount-point-list-command.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/scripts-gdb-add-mount-point-list-command.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Kieran Bingham <kieran.bingham@linaro.org>
Subject: scripts/gdb: add mount point list command
lx-mounts will identify current mount points based on the 'init_task'
namespace by default, as we do not yet have a kernel thread list
implementation to select the current running thread.
Optionally, a user can specify a PID to list from that process'
namespace
Link: http://lkml.kernel.org/r/e614c7bc32d2350b4ff1627ec761a7148e65bfe6.1462865983.git.jan.kiszka@siemens.com
Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
scripts/gdb/linux/constants.py.in | 20 +++++
scripts/gdb/linux/proc.py | 99 ++++++++++++++++++++++++++++
2 files changed, 119 insertions(+)
diff -puN scripts/gdb/linux/constants.py.in~scripts-gdb-add-mount-point-list-command scripts/gdb/linux/constants.py.in
--- a/scripts/gdb/linux/constants.py.in~scripts-gdb-add-mount-point-list-command
+++ a/scripts/gdb/linux/constants.py.in
@@ -12,7 +12,11 @@
*
*/
+#include <linux/fs.h>
+#include <linux/mount.h>
+
/* We need to stringify expanded macros so that they can be parsed */
+
#define STRING(x) #x
#define XSTRING(x) STRING(x)
@@ -30,3 +34,19 @@
<!-- end-c-headers -->
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)
+
+/* linux/mount.h */
+LX_VALUE(MNT_NOSUID)
+LX_VALUE(MNT_NODEV)
+LX_VALUE(MNT_NOEXEC)
+LX_VALUE(MNT_NOATIME)
+LX_VALUE(MNT_NODIRATIME)
+LX_VALUE(MNT_RELATIME)
diff -puN scripts/gdb/linux/proc.py~scripts-gdb-add-mount-point-list-command scripts/gdb/linux/proc.py
--- a/scripts/gdb/linux/proc.py~scripts-gdb-add-mount-point-list-command
+++ a/scripts/gdb/linux/proc.py
@@ -12,6 +12,10 @@
#
import gdb
+from linux import constants
+from linux import utils
+from linux import tasks
+from linux import lists
class LxCmdLine(gdb.Command):
@@ -96,3 +100,98 @@ Equivalent to cat /proc/ioports on a run
return show_lx_resources("ioport_resource")
LxIOPorts()
+
+
+# Mount namespace viewer
+# /proc/mounts
+
+def info_opts(lst, opt):
+ opts = ""
+ for key, string in lst.items():
+ if opt & key:
+ opts += string
+ 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"}
+
+MNT_INFO = {constants.LX_MNT_NOSUID: ",nosuid",
+ constants.LX_MNT_NODEV: ",nodev",
+ constants.LX_MNT_NOEXEC: ",noexec",
+ constants.LX_MNT_NOATIME: ",noatime",
+ constants.LX_MNT_NODIRATIME: ",nodiratime",
+ constants.LX_MNT_RELATIME: ",relatime"}
+
+mount_type = utils.CachedType("struct mount")
+mount_ptr_type = mount_type.get_type().pointer()
+
+
+class LxMounts(gdb.Command):
+ """Report the VFS mounts of the current process namespace.
+
+Equivalent to cat /proc/mounts on a running target
+An integer value can be supplied to display the mount
+values of that process namespace"""
+
+ def __init__(self):
+ super(LxMounts, self).__init__("lx-mounts", gdb.COMMAND_DATA)
+
+ # Equivalent to proc_namespace.c:show_vfsmnt
+ # However, that has the ability to call into s_op functions
+ # whereas we cannot and must make do with the information we can obtain.
+ def invoke(self, arg, from_tty):
+ argv = gdb.string_to_argv(arg)
+ if len(argv) >= 1:
+ try:
+ pid = int(argv[0])
+ except:
+ raise gdb.GdbError("Provide a PID as integer value")
+ else:
+ pid = 1
+
+ task = tasks.get_task_by_pid(pid)
+ if not task:
+ raise gdb.GdbError("Couldn't find a process with PID {}"
+ .format(pid))
+
+ namespace = task['nsproxy']['mnt_ns']
+ if not namespace:
+ raise gdb.GdbError("No namespace for current process")
+
+ for vfs in lists.list_for_each_entry(namespace['list'],
+ mount_ptr_type, "mnt_list"):
+ devname = vfs['mnt_devname'].string()
+ devname = devname if devname else "none"
+
+ pathname = ""
+ parent = vfs
+ while True:
+ mntpoint = parent['mnt_mountpoint']
+ pathname = utils.dentry_name(mntpoint) + pathname
+ if (parent == parent['mnt_parent']):
+ break
+ parent = parent['mnt_parent']
+
+ if (pathname == ""):
+ pathname = "/"
+
+ superblock = vfs['mnt']['mnt_sb']
+ 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"
+
+ gdb.write(
+ "{} {} {} {}{}{} 0 0\n"
+ .format(devname,
+ pathname,
+ fstype,
+ rd,
+ info_opts(FS_INFO, s_flags),
+ info_opts(MNT_INFO, m_flags)))
+
+LxMounts()
_
Patches currently in -mm which might be from kieran.bingham@linaro.org are
scripts-gdb-provide-linux-constants.patch
scripts-gdb-provide-kernel-list-item-generators.patch
scripts-gdb-convert-modules-usage-to-lists-functions.patch
scripts-gdb-provide-exception-catching-parser.patch
scripts-gdb-support-config_modules-gracefully.patch
scripts-gdb-provide-a-dentry_name-vfs-path-helper.patch
scripts-gdb-add-io-resource-readers.patch
scripts-gdb-add-mount-point-list-command.patch
scripts-gdb-add-cpu-iterators.patch
scripts-gdb-add-a-radix-tree-parser.patch
scripts-gdb-add-documentation-example-for-radix-tree.patch
scripts-gdb-add-lx_thread_info_by_pid-helper.patch
reply other threads:[~2016-05-10 19:34 UTC|newest]
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