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#!/usr/bin/env python
# -*- mode: python; -*-
#============================================================================
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#============================================================================
# Copyright (C) 2008 FUJITSU Limited
# Based on the blkif.py
#============================================================================
"""Support for VSCSI Devices.
"""
import os
import os.path
import sys
import re
import string
from xen.util import utils
SYSFS_SCSI_PATH = "/bus/scsi/devices"
SYSFS_SCSI_DEV_VENDOR_PATH = '/vendor'
SYSFS_SCSI_DEV_MODEL_PATH = '/model'
SYSFS_SCSI_DEV_TYPEID_PATH = '/type'
SYSFS_SCSI_DEV_REVISION_PATH = '/rev'
SYSFS_SCSI_DEV_SCSILEVEL_PATH = '/scsi_level'
SCSI_ID_COMMANDS = [
"/lib/udev/scsi_id -gu --sg-version 3 -d /dev/%s 2>/dev/null",
"/sbin/scsi_id -gu -s /class/scsi_generic/%s 2>/dev/null"
]
def _vscsi_get_devname_by(name, scsi_devices):
"""A device name is gotten by the HCTL.
(e.g., '0:0:0:0' to '/dev/sda')
"""
try:
search = re.compile(r'' + name + '$', re.DOTALL)
except Exception, e:
raise VmError("vscsi: invalid expression. " + str(e))
for hctl, devname, sg, scsi_id in scsi_devices:
if search.match(hctl):
return (hctl, devname)
return (None, None)
def _vscsi_get_hctl_by(phyname, scsi_devices):
"""An HCTL is gotten by the device name or the scsi_id.
(e.g., '/dev/sda' to '0:0:0:0')
"""
if re.match('/dev/sd[a-z]+([1-9]|1[0-5])?$', phyname):
# sd driver
name = re.sub('(^/dev/)|([1-9]|1[0-5])?$', '', phyname)
elif re.match('/dev/sg[0-9]+$', phyname):
# sg driver
name = re.sub('^/dev/', '', phyname)
elif re.match('/dev/st[0-9]+$', phyname):
# st driver
name = re.sub('^/dev/', '', phyname)
else:
# scsi_id -gu
name = phyname
for hctl, devname, sg, scsi_id in scsi_devices:
if name in [devname, sg, scsi_id]:
return (hctl, devname)
return (None, None)
def _vscsi_get_scsiid(sg):
for scsi_id_command in SCSI_ID_COMMANDS:
scsi_id = os.popen(scsi_id_command % sg).read().split()
if len(scsi_id):
return scsi_id[0]
return None
def _vscsi_get_scsidevices_by_lsscsi(option = ""):
""" get all scsi devices information by lsscsi """
devices = []
for scsiinfo in os.popen('{ lsscsi -g %s; } 2>/dev/null' % option).readlines():
s = scsiinfo.replace(']', '] ').split()
hctl = s[0][1:-1]
try:
devname = s[-2].split('/dev/')[1]
except IndexError:
devname = None
try:
sg = s[-1].split('/dev/')[1]
if devname is None:
devname = sg
scsi_id = _vscsi_get_scsiid(sg)
except IndexError:
sg = None
scsi_id = None
devices.append([hctl, devname, sg, scsi_id])
return devices
def _vscsi_get_scsidevices_by_sysfs():
""" get all scsi devices information by sysfs """
devices = []
try:
sysfs_mnt = utils.find_sysfs_mount()
except:
return devices
if sysfs_mnt is None:
return devices
for dirpath, dirnames, files in os.walk(sysfs_mnt + SYSFS_SCSI_PATH):
for hctl in dirnames:
paths = os.path.join(dirpath, hctl)
devname = None
sg = None
scsi_id = None
for f in os.listdir(paths):
realpath = os.path.realpath(os.path.join(paths, f))
if re.match('^block', f) or \
re.match('^tape', f) or \
re.match('^scsi_changer', f) or \
re.match('^onstream_tape', f):
devname = os.path.basename(realpath)
if re.match('^scsi_generic', f):
sg = os.path.basename(realpath)
scsi_id = _vscsi_get_scsiid(sg)
devices.append([hctl, devname, sg, scsi_id])
return devices
def vscsi_get_scsidevices(mask=""):
""" get all scsi devices information """
devices = _vscsi_get_scsidevices_by_lsscsi("[%s]" % mask)
if devices or (len(mask) and mask[0] != "*"):
# devices found or partial device scan
return devices
return _vscsi_get_scsidevices_by_sysfs()
def vscsi_get_hctl_and_devname_by(target, scsi_devices = None):
if target.startswith('/dev/'):
target = os.path.realpath(target)
if scsi_devices is None:
if len(target.split(':')) == 4:
scsi_devices = _vscsi_get_scsidevices_by_lsscsi(target)
elif target.startswith('/dev/'):
scsi_devices = _vscsi_get_scsidevices_by_lsscsi("| grep %s" % target)
else:
scsi_devices = _vscsi_get_scsidevices_by_lsscsi("")
if not scsi_devices:
scsi_devices = _vscsi_get_scsidevices_by_sysfs()
if len(target.split(':')) == 4:
return _vscsi_get_devname_by(target, scsi_devices)
else:
return _vscsi_get_hctl_by(target, scsi_devices)
def get_scsi_vendor(pHCTL):
try:
sysfs_mnt = utils.find_sysfs_mount()
sysfs_scsi_dev_path = \
os.path.join(sysfs_mnt + SYSFS_SCSI_PATH, pHCTL)
scsi_vendor = \
os.popen('cat ' + sysfs_scsi_dev_path + \
SYSFS_SCSI_DEV_VENDOR_PATH).read()
return scsi_vendor.splitlines()[0]
except:
return None
def get_scsi_model(pHCTL):
try:
sysfs_mnt = utils.find_sysfs_mount()
sysfs_scsi_dev_path = \
os.path.join(sysfs_mnt + SYSFS_SCSI_PATH, pHCTL)
scsi_model = \
os.popen('cat ' + sysfs_scsi_dev_path + \
SYSFS_SCSI_DEV_MODEL_PATH).read()
return scsi_model.splitlines()[0]
except:
return None
def get_scsi_typeid(pHCTL):
try:
sysfs_mnt = utils.find_sysfs_mount()
sysfs_scsi_dev_path = \
os.path.join(sysfs_mnt + SYSFS_SCSI_PATH, pHCTL)
scsi_typeid = \
os.popen('cat ' + sysfs_scsi_dev_path + \
SYSFS_SCSI_DEV_TYPEID_PATH).read()
return int(scsi_typeid.splitlines()[0])
except:
return None
def get_scsi_revision(pHCTL):
try:
sysfs_mnt = utils.find_sysfs_mount()
sysfs_scsi_dev_path = \
os.path.join(sysfs_mnt + SYSFS_SCSI_PATH, pHCTL)
scsi_revision = \
os.popen('cat ' + sysfs_scsi_dev_path + \
SYSFS_SCSI_DEV_REVISION_PATH).read()
return scsi_revision.splitlines()[0]
except:
return None
def get_scsi_scsilevel(pHCTL):
try:
sysfs_mnt = utils.find_sysfs_mount()
sysfs_scsi_dev_path = \
os.path.join(sysfs_mnt + SYSFS_SCSI_PATH, pHCTL)
scsi_scsilevel = \
os.popen('cat ' + sysfs_scsi_dev_path + \
SYSFS_SCSI_DEV_SCSILEVEL_PATH).read()
return int(scsi_scsilevel.splitlines()[0])
except:
return None
def _make_scsi_record(scsi_info):
scsi_rec = {
'physical_HCTL': scsi_info[0],
'dev_name': None,
'sg_name': scsi_info[2],
'scsi_id': None
}
if scsi_info[1] is not None:
scsi_rec['dev_name'] = scsi_info[1]
if scsi_info[3] is not None:
scsi_rec['scsi_id'] = scsi_info[3]
scsi_rec['vendor_name'] = \
get_scsi_vendor(scsi_rec['physical_HCTL'])
scsi_rec['model'] = \
get_scsi_model(scsi_rec['physical_HCTL'])
scsi_rec['type_id'] = \
get_scsi_typeid(scsi_rec['physical_HCTL'])
scsi_rec['revision'] = \
get_scsi_revision(scsi_rec['physical_HCTL'])
scsi_rec['scsi_level'] = \
get_scsi_scsilevel(scsi_rec['physical_HCTL'])
try:
lsscsi_info = os.popen('lsscsi %s 2>/dev/null' % scsi_rec['physical_HCTL']).read().split()
scsi_rec['type'] = lsscsi_info[1]
except:
scsi_rec['type'] = None
return scsi_rec
def get_scsi_device(pHCTL):
scsis_info = _vscsi_get_scsidevices_by_lsscsi(pHCTL)
if not scsis_info:
scsis_info = _vscsi_get_scsidevices_by_sysfs()
for scsi_info in scsis_info:
if scsi_info[0] == pHCTL:
return _make_scsi_record(scsi_info)
return None
def get_all_scsi_devices(mask=""):
scsi_records = []
for scsi_info in vscsi_get_scsidevices(mask):
scsi_record = _make_scsi_record(scsi_info)
scsi_records.append(scsi_record)
return scsi_records
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