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Diffstat (limited to 'pyanaconda/storage/devicelibs/edd.py')
| -rw-r--r-- | pyanaconda/storage/devicelibs/edd.py | 231 |
1 files changed, 0 insertions, 231 deletions
diff --git a/pyanaconda/storage/devicelibs/edd.py b/pyanaconda/storage/devicelibs/edd.py deleted file mode 100644 index 30e8004d3..000000000 --- a/pyanaconda/storage/devicelibs/edd.py +++ /dev/null @@ -1,231 +0,0 @@ -# -# edd.py -# BIOS EDD data parsing functions -# -# Copyright (C) 2010 Red Hat, Inc. All rights reserved. -# -# This program is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 2 of the License, or -# (at your option) any later version. -# -# This program 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 General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with this program. If not, see <http://www.gnu.org/licenses/>. -# -# Author(s): Hans de Goede <hdegoede@redhat.com> -# Ales Kozumplik <akozumpl@redhat.com> -# - -import glob -import logging -import os -import re -import struct - -log = logging.getLogger("storage") - -re_host_bus = re.compile(r'^PCI\s*(\S*)\s*channel: (\S*)\s*$') -re_interface_scsi = re.compile(r'^SCSI\s*id: (\S*)\s*lun: (\S*)\s*$') -re_interface_ata = re.compile(r'^ATA\s*device: (\S*)\s*$') - -class EddEntry(object): - """ This object merely collects what the /sys/firmware/edd/* entries can - provide. - """ - def __init__(self, sysfspath): - self.type = None - - self.ata_device = None - self.channel = None - self.mbr_signature = None - self.pci_dev = None - self.scsi_id = None - self.scsi_lun = None - self.sectors = None - - self.load(sysfspath) - - def __str__(self): - return \ - "\ttype: %(type)s, ata_device: %(ata_device)s\n" \ - "\tchannel: %(channel)s, mbr_signature: %(mbr_signature)s\n" \ - "\tpci_dev: %(pci_dev)s, scsi_id: %(scsi_id)s\n" \ - "\tscsi_lun: %(scsi_lun)s, sectors: %(sectors)s" % self.__dict__ - - def _read_file(self, filename): - contents = None - if os.path.exists(filename): - with open(filename) as f: - contents = f.read().rstrip() - return contents - - def load(self, sysfspath): - interface = self._read_file(os.path.join(sysfspath, "interface")) - if interface: - self.type = interface.split()[0] - if self.type == "SCSI": - match = re_interface_scsi.match(interface) - self.scsi_id = int(match.group(1)) - self.scsi_lun = int(match.group(2)) - elif self.type == "ATA": - match = re_interface_ata.match(interface) - self.ata_device = int(match.group(1)) - - self.mbr_signature = self._read_file( - os.path.join(sysfspath, "mbr_signature")) - sectors = self._read_file(os.path.join(sysfspath, "sectors")) - if sectors: - self.sectors = int(sectors) - hbus = self._read_file(os.path.join(sysfspath, "host_bus")) - if hbus: - match = re_host_bus.match(hbus) - if match: - self.pci_dev = match.group(1) - self.channel = int(match.group(2)) - else: - log.warning("edd: can not match host_bus: %s" % hbus) - -class EddMatcher(object): - """ This object tries to match given entry to a disk device name. - - Assuming, heuristic analysis and guessing hapens here. - """ - def __init__(self, edd_entry): - self.edd = edd_entry - - def devname_from_pci_dev(self): - name = None - if self.edd.type == "ATA" and \ - self.edd.channel is not None and \ - self.edd.ata_device is not None: - path = "/sys/devices/pci0000:00/0000:%(pci_dev)s/host%(chan)d/"\ - "target%(chan)d:0:%(dev)d/%(chan)d:0:%(dev)d:0/block" % { - 'pci_dev' : self.edd.pci_dev, - 'chan' : self.edd.channel, - 'dev' : self.edd.ata_device - } - if os.path.isdir(path): - block_entries = os.listdir(path) - if len(block_entries) == 1: - name = block_entries[0] - else: - log.warning("edd: directory does not exist: %s" % path) - elif self.edd.type == "SCSI": - pattern = "/sys/devices/pci0000:00/0000:%(pci_dev)s/virtio*/block" % \ - {'pci_dev' : self.edd.pci_dev} - matching_paths = glob.glob(pattern) - if len(matching_paths) != 1 or not os.path.exists(matching_paths[0]): - return None - block_entries = os.listdir(matching_paths[0]) - if len(block_entries) == 1: - name = block_entries[0] - return name - - def match_via_mbrsigs(self, mbr_dict): - """ Try to match the edd entry based on its mbr signature. - - This will obviously fail for a fresh drive/image, but in extreme - cases can also show false positives for randomly matching data. - """ - for (name, mbr_signature) in mbr_dict.items(): - if mbr_signature == self.edd.mbr_signature: - return name - return None - -def biosdev_to_edd_dir(biosdev): - return "/sys/firmware/edd/int13_dev%x" % biosdev - -def collect_edd_data(): - edd_data_dict = {} - # the hard drive numbering starts at 0x80 (128 decimal): - for biosdev in range(0x80, 0x80+16): - sysfspath = biosdev_to_edd_dir(biosdev) - if not os.path.exists(sysfspath): - break - edd_data_dict[biosdev] = EddEntry(sysfspath) - return edd_data_dict - -def collect_mbrs(devices): - """ Read MBR signatures from devices. - - Returns a dict mapping device names to their MBR signatures. It is not - guaranteed this will succeed, with a new disk for instance. - """ - mbr_dict = {} - for dev in devices: - try: - fd = os.open(dev.path, os.O_RDONLY) - # The signature is the unsigned integer at byte 440: - os.lseek(fd, 440, 0) - mbrsig = struct.unpack('I', os.read(fd, 4)) - os.close(fd) - except OSError as e: - log.warning("edd: error reading mbrsig from disk %s: %s" % - (dev.name, str(e))) - continue - - mbrsig_str = "0x%08x" % mbrsig - # sanity check - if mbrsig_str == '0x00000000': - log.info("edd: MBR signature on %s is zero. new disk image?" % dev.name) - continue - else: - for (dev_name, mbrsig_str_old) in mbr_dict.items(): - if mbrsig_str_old == mbrsig_str: - log.error("edd: dupicite MBR signature %s for %s and %s" % - (mbrsig_str, dev_name, dev.name)) - # this actually makes all the other data useless - return {} - # update the dictionary - mbr_dict[dev.name] = mbrsig_str - log.info("edd: collected mbr signatures: %s" % mbr_dict) - return mbr_dict - -def get_edd_dict(devices): - """ Generates the 'device name' -> 'edd number' mapping. - - The EDD kernel module that exposes /sys/firmware/edd is thoroughly - broken, the information there is incomplete and sometimes downright - wrong. So after we mine out all useful information that the files under - /sys/firmware/edd/int13_*/ can provide, we resort to heuristics and - guessing. Our first attempt is, by looking at the device type int - 'interface', attempting to map pci device number, channel number etc. to - a sysfs path, check that the path really exists, then read the device - name (e.g 'sda') from there. Should this fail we try to match contents - of 'mbr_signature' to a real MBR signature found on the existing block - devices. - """ - mbr_dict = collect_mbrs(devices) - edd_entries_dict = collect_edd_data() - global edd_dict - for (edd_number, edd_entry) in edd_entries_dict.items(): - log.debug("edd: data extracted from 0x%x:\n%s" % (edd_number, edd_entry)) - matcher = EddMatcher(edd_entry) - # first try to match through the pci dev etc. - name = matcher.devname_from_pci_dev() - # next try to compare mbr signatures - if name: - log.debug("edd: matched 0x%x to %s using pci_dev" % (edd_number, name)) - else: - name = matcher.match_via_mbrsigs(mbr_dict) - if name: - log.info("edd: matched 0x%x to %s using MBR sig" % (edd_number, name)) - - if name: - old_edd_number = edd_dict.get(name) - if old_edd_number: - log.info("edd: both edd entries 0x%x and 0x%x seem to map to %s" % - (old_edd_number, edd_number, name)) - # this means all the other data can be confused and useless - return {} - edd_dict[name] = edd_number - continue - log.error("edd: unable to match edd entry 0x%x" % edd_number) - return edd_dict - -edd_dict = {} |