Revision abdf0113 lib/bdev.py
b/lib/bdev.py | ||
---|---|---|
43 | 43 |
- online (=used, or ready for use) |
44 | 44 |
|
45 | 45 |
A device can also be online but read-only, however we are not using |
46 |
the readonly state (MD and LV have it, if needed in the future)
|
|
47 |
and we are usually looking at this like at a stack, so it's easier
|
|
48 |
to conceptualise the transition from not-existing to online and back
|
|
46 |
the readonly state (LV has it, if needed in the future) and we are
|
|
47 |
usually looking at this like at a stack, so it's easier to
|
|
48 |
conceptualise the transition from not-existing to online and back |
|
49 | 49 |
like a linear one. |
50 | 50 |
|
51 | 51 |
The many different states of the device are due to the fact that we |
52 | 52 |
need to cover many device types: |
53 | 53 |
- logical volumes are created, lvchange -a y $lv, and used |
54 |
- md arrays are created or assembled and used |
|
55 | 54 |
- drbd devices are attached to a local disk/remote peer and made primary |
56 | 55 |
|
57 | 56 |
A block device is identified by three items: |
... | ... | |
61 | 60 |
|
62 | 61 |
Not all devices implement both the first two as distinct items. LVM |
63 | 62 |
logical volumes have their unique ID (the pair volume group, logical |
64 |
volume name) in a 1-to-1 relation to the dev path. For MD devices, |
|
65 |
the /dev path is dynamic and the unique ID is the UUID generated at |
|
66 |
array creation plus the slave list. For DRBD devices, the /dev path |
|
67 |
is again dynamic and the unique id is the pair (host1, dev1), |
|
68 |
(host2, dev2). |
|
63 |
volume name) in a 1-to-1 relation to the dev path. For DRBD devices, |
|
64 |
the /dev path is again dynamic and the unique id is the pair (host1, |
|
65 |
dev1), (host2, dev2). |
|
69 | 66 |
|
70 | 67 |
You can get to a device in two ways: |
71 | 68 |
- creating the (real) device, which returns you |
72 |
an attached instance (lvcreate, mdadm --create)
|
|
69 |
an attached instance (lvcreate) |
|
73 | 70 |
- attaching of a python instance to an existing (real) device |
74 | 71 |
|
75 | 72 |
The second point, the attachement to a device, is different |
... | ... | |
149 | 146 |
def Remove(self): |
150 | 147 |
"""Remove this device. |
151 | 148 |
|
152 |
This makes sense only for some of the device types: LV and to a
|
|
153 |
lesser degree, md devices. Also note that if the device can't
|
|
154 |
attach, the removal can't be completed.
|
|
149 |
This makes sense only for some of the device types: LV and file
|
|
150 |
storeage. Also note that if the device can't attach, the removal
|
|
151 |
can't be completed. |
|
155 | 152 |
|
156 | 153 |
""" |
157 | 154 |
raise NotImplementedError |
... | ... | |
523 | 520 |
result.output)) |
524 | 521 |
|
525 | 522 |
|
526 |
class MDRaid1(BlockDev): |
|
527 |
"""raid1 device implemented via md. |
|
528 |
|
|
529 |
""" |
|
530 |
def __init__(self, unique_id, children): |
|
531 |
super(MDRaid1, self).__init__(unique_id, children) |
|
532 |
self.major = 9 |
|
533 |
self.Attach() |
|
534 |
|
|
535 |
def Attach(self): |
|
536 |
"""Find an array which matches our config and attach to it. |
|
537 |
|
|
538 |
This tries to find a MD array which has the same UUID as our own. |
|
539 |
|
|
540 |
""" |
|
541 |
minor = self._FindMDByUUID(self.unique_id) |
|
542 |
if minor is not None: |
|
543 |
self._SetFromMinor(minor) |
|
544 |
else: |
|
545 |
self.minor = None |
|
546 |
self.dev_path = None |
|
547 |
|
|
548 |
return (minor is not None) |
|
549 |
|
|
550 |
@staticmethod |
|
551 |
def _GetUsedDevs(): |
|
552 |
"""Compute the list of in-use MD devices. |
|
553 |
|
|
554 |
It doesn't matter if the used device have other raid level, just |
|
555 |
that they are in use. |
|
556 |
|
|
557 |
""" |
|
558 |
mdstat = open("/proc/mdstat", "r") |
|
559 |
data = mdstat.readlines() |
|
560 |
mdstat.close() |
|
561 |
|
|
562 |
used_md = {} |
|
563 |
valid_line = re.compile("^md([0-9]+) : .*$") |
|
564 |
for line in data: |
|
565 |
match = valid_line.match(line) |
|
566 |
if match: |
|
567 |
md_no = int(match.group(1)) |
|
568 |
used_md[md_no] = line |
|
569 |
|
|
570 |
return used_md |
|
571 |
|
|
572 |
@staticmethod |
|
573 |
def _GetDevInfo(minor): |
|
574 |
"""Get info about a MD device. |
|
575 |
|
|
576 |
Currently only uuid is returned. |
|
577 |
|
|
578 |
""" |
|
579 |
result = utils.RunCmd(["mdadm", "-D", "/dev/md%d" % minor]) |
|
580 |
if result.failed: |
|
581 |
logger.Error("Can't display md: %s - %s" % |
|
582 |
(result.fail_reason, result.output)) |
|
583 |
return None |
|
584 |
retval = {} |
|
585 |
for line in result.stdout.splitlines(): |
|
586 |
line = line.strip() |
|
587 |
kv = line.split(" : ", 1) |
|
588 |
if kv: |
|
589 |
if kv[0] == "UUID": |
|
590 |
retval["uuid"] = kv[1].split()[0] |
|
591 |
elif kv[0] == "State": |
|
592 |
retval["state"] = kv[1].split(", ") |
|
593 |
return retval |
|
594 |
|
|
595 |
@staticmethod |
|
596 |
def _FindUnusedMinor(): |
|
597 |
"""Compute an unused MD minor. |
|
598 |
|
|
599 |
This code assumes that there are 256 minors only. |
|
600 |
|
|
601 |
""" |
|
602 |
used_md = MDRaid1._GetUsedDevs() |
|
603 |
i = 0 |
|
604 |
while i < 256: |
|
605 |
if i not in used_md: |
|
606 |
break |
|
607 |
i += 1 |
|
608 |
if i == 256: |
|
609 |
logger.Error("Critical: Out of md minor numbers.") |
|
610 |
raise errors.BlockDeviceError("Can't find a free MD minor") |
|
611 |
return i |
|
612 |
|
|
613 |
@classmethod |
|
614 |
def _FindMDByUUID(cls, uuid): |
|
615 |
"""Find the minor of an MD array with a given UUID. |
|
616 |
|
|
617 |
""" |
|
618 |
md_list = cls._GetUsedDevs() |
|
619 |
for minor in md_list: |
|
620 |
info = cls._GetDevInfo(minor) |
|
621 |
if info and info["uuid"] == uuid: |
|
622 |
return minor |
|
623 |
return None |
|
624 |
|
|
625 |
@staticmethod |
|
626 |
def _ZeroSuperblock(dev_path): |
|
627 |
"""Zero the possible locations for an MD superblock. |
|
628 |
|
|
629 |
The zero-ing can't be done via ``mdadm --zero-superblock`` as that |
|
630 |
fails in versions 2.x with the same error code as non-writable |
|
631 |
device. |
|
632 |
|
|
633 |
The superblocks are located at (negative values are relative to |
|
634 |
the end of the block device): |
|
635 |
- -128k to end for version 0.90 superblock |
|
636 |
- -8k to -12k for version 1.0 superblock (included in the above) |
|
637 |
- 0k to 4k for version 1.1 superblock |
|
638 |
- 4k to 8k for version 1.2 superblock |
|
639 |
|
|
640 |
To cover all situations, the zero-ing will be: |
|
641 |
- 0k to 128k |
|
642 |
- -128k to end |
|
643 |
|
|
644 |
As such, the minimum device size must be 128k, otherwise we'll get |
|
645 |
I/O errors. |
|
646 |
|
|
647 |
Note that this function depends on the fact that one can open, |
|
648 |
read and write block devices normally. |
|
649 |
|
|
650 |
""" |
|
651 |
overwrite_size = 128 * 1024 |
|
652 |
empty_buf = '\0' * overwrite_size |
|
653 |
fd = open(dev_path, "r+") |
|
654 |
try: |
|
655 |
fd.seek(0, 0) |
|
656 |
p1 = fd.tell() |
|
657 |
fd.write(empty_buf) |
|
658 |
p2 = fd.tell() |
|
659 |
logger.Debug("Zeroed %s from %d to %d" % (dev_path, p1, p2)) |
|
660 |
fd.seek(-overwrite_size, 2) |
|
661 |
p1 = fd.tell() |
|
662 |
fd.write(empty_buf) |
|
663 |
p2 = fd.tell() |
|
664 |
logger.Debug("Zeroed %s from %d to %d" % (dev_path, p1, p2)) |
|
665 |
finally: |
|
666 |
fd.close() |
|
667 |
|
|
668 |
@classmethod |
|
669 |
def Create(cls, unique_id, children, size): |
|
670 |
"""Create a new MD raid1 array. |
|
671 |
|
|
672 |
""" |
|
673 |
if not isinstance(children, (tuple, list)): |
|
674 |
raise ValueError("Invalid setup data for MDRaid1 dev: %s" % |
|
675 |
str(children)) |
|
676 |
for i in children: |
|
677 |
if not isinstance(i, BlockDev): |
|
678 |
raise ValueError("Invalid member in MDRaid1 dev: %s" % type(i)) |
|
679 |
for i in children: |
|
680 |
try: |
|
681 |
cls._ZeroSuperblock(i.dev_path) |
|
682 |
except EnvironmentError, err: |
|
683 |
logger.Error("Can't zero superblock for %s: %s" % |
|
684 |
(i.dev_path, str(err))) |
|
685 |
return None |
|
686 |
minor = cls._FindUnusedMinor() |
|
687 |
result = utils.RunCmd(["mdadm", "--create", "/dev/md%d" % minor, |
|
688 |
"--auto=yes", "--force", "-l1", |
|
689 |
"-n%d" % len(children)] + |
|
690 |
[dev.dev_path for dev in children]) |
|
691 |
|
|
692 |
if result.failed: |
|
693 |
logger.Error("Can't create md: %s: %s" % (result.fail_reason, |
|
694 |
result.output)) |
|
695 |
return None |
|
696 |
info = cls._GetDevInfo(minor) |
|
697 |
if not info or not "uuid" in info: |
|
698 |
logger.Error("Wrong information returned from mdadm -D: %s" % str(info)) |
|
699 |
return None |
|
700 |
return MDRaid1(info["uuid"], children) |
|
701 |
|
|
702 |
def Remove(self): |
|
703 |
"""Stub remove function for MD RAID 1 arrays. |
|
704 |
|
|
705 |
We don't remove the superblock right now. Mark a to do. |
|
706 |
|
|
707 |
""" |
|
708 |
#TODO: maybe zero superblock on child devices? |
|
709 |
return self.Shutdown() |
|
710 |
|
|
711 |
def Rename(self, new_id): |
|
712 |
"""Rename a device. |
|
713 |
|
|
714 |
This is not supported for md raid1 devices. |
|
715 |
|
|
716 |
""" |
|
717 |
raise errors.ProgrammerError("Can't rename a md raid1 device") |
|
718 |
|
|
719 |
def AddChildren(self, devices): |
|
720 |
"""Add new member(s) to the md raid1. |
|
721 |
|
|
722 |
""" |
|
723 |
if self.minor is None and not self.Attach(): |
|
724 |
raise errors.BlockDeviceError("Can't attach to device") |
|
725 |
|
|
726 |
args = ["mdadm", "-a", self.dev_path] |
|
727 |
for dev in devices: |
|
728 |
if dev.dev_path is None: |
|
729 |
raise errors.BlockDeviceError("Child '%s' is not initialised" % dev) |
|
730 |
dev.Open() |
|
731 |
args.append(dev.dev_path) |
|
732 |
result = utils.RunCmd(args) |
|
733 |
if result.failed: |
|
734 |
raise errors.BlockDeviceError("Failed to add new device to array: %s" % |
|
735 |
result.output) |
|
736 |
new_len = len(self._children) + len(devices) |
|
737 |
result = utils.RunCmd(["mdadm", "--grow", self.dev_path, "-n", new_len]) |
|
738 |
if result.failed: |
|
739 |
raise errors.BlockDeviceError("Can't grow md array: %s" % |
|
740 |
result.output) |
|
741 |
self._children.extend(devices) |
|
742 |
|
|
743 |
def RemoveChildren(self, devices): |
|
744 |
"""Remove member(s) from the md raid1. |
|
745 |
|
|
746 |
""" |
|
747 |
if self.minor is None and not self.Attach(): |
|
748 |
raise errors.BlockDeviceError("Can't attach to device") |
|
749 |
new_len = len(self._children) - len(devices) |
|
750 |
if new_len < 1: |
|
751 |
raise errors.BlockDeviceError("Can't reduce to less than one child") |
|
752 |
args = ["mdadm", "-f", self.dev_path] |
|
753 |
orig_devs = [] |
|
754 |
for dev in devices: |
|
755 |
args.append(dev) |
|
756 |
for c in self._children: |
|
757 |
if c.dev_path == dev: |
|
758 |
orig_devs.append(c) |
|
759 |
break |
|
760 |
else: |
|
761 |
raise errors.BlockDeviceError("Can't find device '%s' for removal" % |
|
762 |
dev) |
|
763 |
result = utils.RunCmd(args) |
|
764 |
if result.failed: |
|
765 |
raise errors.BlockDeviceError("Failed to mark device(s) as failed: %s" % |
|
766 |
result.output) |
|
767 |
|
|
768 |
# it seems here we need a short delay for MD to update its |
|
769 |
# superblocks |
|
770 |
time.sleep(0.5) |
|
771 |
args[1] = "-r" |
|
772 |
result = utils.RunCmd(args) |
|
773 |
if result.failed: |
|
774 |
raise errors.BlockDeviceError("Failed to remove device(s) from array:" |
|
775 |
" %s" % result.output) |
|
776 |
result = utils.RunCmd(["mdadm", "--grow", "--force", self.dev_path, |
|
777 |
"-n", new_len]) |
|
778 |
if result.failed: |
|
779 |
raise errors.BlockDeviceError("Can't shrink md array: %s" % |
|
780 |
result.output) |
|
781 |
for dev in orig_devs: |
|
782 |
self._children.remove(dev) |
|
783 |
|
|
784 |
def _SetFromMinor(self, minor): |
|
785 |
"""Set our parameters based on the given minor. |
|
786 |
|
|
787 |
This sets our minor variable and our dev_path. |
|
788 |
|
|
789 |
""" |
|
790 |
self.minor = minor |
|
791 |
self.dev_path = "/dev/md%d" % minor |
|
792 |
|
|
793 |
def Assemble(self): |
|
794 |
"""Assemble the MD device. |
|
795 |
|
|
796 |
At this point we should have: |
|
797 |
- list of children devices |
|
798 |
- uuid |
|
799 |
|
|
800 |
""" |
|
801 |
result = super(MDRaid1, self).Assemble() |
|
802 |
if not result: |
|
803 |
return result |
|
804 |
md_list = self._GetUsedDevs() |
|
805 |
for minor in md_list: |
|
806 |
info = self._GetDevInfo(minor) |
|
807 |
if info and info["uuid"] == self.unique_id: |
|
808 |
self._SetFromMinor(minor) |
|
809 |
logger.Info("MD array %s already started" % str(self)) |
|
810 |
return True |
|
811 |
free_minor = self._FindUnusedMinor() |
|
812 |
result = utils.RunCmd(["mdadm", "-A", "--auto=yes", "--uuid", |
|
813 |
self.unique_id, "/dev/md%d" % free_minor] + |
|
814 |
[bdev.dev_path for bdev in self._children]) |
|
815 |
if result.failed: |
|
816 |
logger.Error("Can't assemble MD array: %s: %s" % |
|
817 |
(result.fail_reason, result.output)) |
|
818 |
self.minor = None |
|
819 |
else: |
|
820 |
self.minor = free_minor |
|
821 |
return not result.failed |
|
822 |
|
|
823 |
def Shutdown(self): |
|
824 |
"""Tear down the MD array. |
|
825 |
|
|
826 |
This does a 'mdadm --stop' so after this command, the array is no |
|
827 |
longer available. |
|
828 |
|
|
829 |
""" |
|
830 |
if self.minor is None and not self.Attach(): |
|
831 |
logger.Info("MD object not attached to a device") |
|
832 |
return True |
|
833 |
|
|
834 |
result = utils.RunCmd(["mdadm", "--stop", "/dev/md%d" % self.minor]) |
|
835 |
if result.failed: |
|
836 |
logger.Error("Can't stop MD array: %s - %s" % |
|
837 |
(result.fail_reason, result.output)) |
|
838 |
return False |
|
839 |
self.minor = None |
|
840 |
self.dev_path = None |
|
841 |
return True |
|
842 |
|
|
843 |
def SetSyncSpeed(self, kbytes): |
|
844 |
"""Set the maximum sync speed for the MD array. |
|
845 |
|
|
846 |
""" |
|
847 |
result = super(MDRaid1, self).SetSyncSpeed(kbytes) |
|
848 |
if self.minor is None: |
|
849 |
logger.Error("MD array not attached to a device") |
|
850 |
return False |
|
851 |
f = open("/sys/block/md%d/md/sync_speed_max" % self.minor, "w") |
|
852 |
try: |
|
853 |
f.write("%d" % kbytes) |
|
854 |
finally: |
|
855 |
f.close() |
|
856 |
f = open("/sys/block/md%d/md/sync_speed_min" % self.minor, "w") |
|
857 |
try: |
|
858 |
f.write("%d" % (kbytes/2)) |
|
859 |
finally: |
|
860 |
f.close() |
|
861 |
return result |
|
862 |
|
|
863 |
def GetSyncStatus(self): |
|
864 |
"""Returns the sync status of the device. |
|
865 |
|
|
866 |
Returns: |
|
867 |
(sync_percent, estimated_time, is_degraded, ldisk) |
|
868 |
|
|
869 |
If sync_percent is None, it means all is ok |
|
870 |
If estimated_time is None, it means we can't esimate |
|
871 |
the time needed, otherwise it's the time left in seconds. |
|
872 |
|
|
873 |
The ldisk parameter is always true for MD devices. |
|
874 |
|
|
875 |
""" |
|
876 |
if self.minor is None and not self.Attach(): |
|
877 |
raise errors.BlockDeviceError("Can't attach to device in GetSyncStatus") |
|
878 |
dev_info = self._GetDevInfo(self.minor) |
|
879 |
is_clean = ("state" in dev_info and |
|
880 |
len(dev_info["state"]) == 1 and |
|
881 |
dev_info["state"][0] in ("clean", "active")) |
|
882 |
sys_path = "/sys/block/md%s/md/" % self.minor |
|
883 |
f = file(sys_path + "sync_action") |
|
884 |
sync_status = f.readline().strip() |
|
885 |
f.close() |
|
886 |
if sync_status == "idle": |
|
887 |
return None, None, not is_clean, False |
|
888 |
f = file(sys_path + "sync_completed") |
|
889 |
sync_completed = f.readline().strip().split(" / ") |
|
890 |
f.close() |
|
891 |
if len(sync_completed) != 2: |
|
892 |
return 0, None, not is_clean, False |
|
893 |
sync_done, sync_total = [float(i) for i in sync_completed] |
|
894 |
sync_percent = 100.0*sync_done/sync_total |
|
895 |
f = file(sys_path + "sync_speed") |
|
896 |
sync_speed_k = int(f.readline().strip()) |
|
897 |
if sync_speed_k == 0: |
|
898 |
time_est = None |
|
899 |
else: |
|
900 |
time_est = (sync_total - sync_done) / 2 / sync_speed_k |
|
901 |
return sync_percent, time_est, not is_clean, False |
|
902 |
|
|
903 |
def Open(self, force=False): |
|
904 |
"""Make the device ready for I/O. |
|
905 |
|
|
906 |
This is a no-op for the MDRaid1 device type, although we could use |
|
907 |
the 2.6.18's new array_state thing. |
|
908 |
|
|
909 |
""" |
|
910 |
pass |
|
911 |
|
|
912 |
def Close(self): |
|
913 |
"""Notifies that the device will no longer be used for I/O. |
|
914 |
|
|
915 |
This is a no-op for the MDRaid1 device type, but see comment for |
|
916 |
`Open()`. |
|
917 |
|
|
918 |
""" |
|
919 |
pass |
|
920 |
|
|
921 |
|
|
922 | 523 |
class BaseDRBD(BlockDev): |
923 | 524 |
"""Base DRBD class. |
924 | 525 |
|
925 | 526 |
This class contains a few bits of common functionality between the |
926 | 527 |
0.7 and 8.x versions of DRBD. |
927 | 528 |
|
928 |
""" |
|
929 |
_VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)" |
|
930 |
r" \(api:(\d+)/proto:(\d+)(?:-(\d+))?\)") |
|
931 |
|
|
932 |
_DRBD_MAJOR = 147 |
|
933 |
_ST_UNCONFIGURED = "Unconfigured" |
|
934 |
_ST_WFCONNECTION = "WFConnection" |
|
935 |
_ST_CONNECTED = "Connected" |
|
936 |
|
|
937 |
@staticmethod |
|
938 |
def _GetProcData(): |
|
939 |
"""Return data from /proc/drbd. |
|
940 |
|
|
941 |
""" |
|
942 |
stat = open("/proc/drbd", "r") |
|
943 |
try: |
|
944 |
data = stat.read().splitlines() |
|
945 |
finally: |
|
946 |
stat.close() |
|
947 |
if not data: |
|
948 |
raise errors.BlockDeviceError("Can't read any data from /proc/drbd") |
|
949 |
return data |
|
950 |
|
|
951 |
@staticmethod |
|
952 |
def _MassageProcData(data): |
|
953 |
"""Transform the output of _GetProdData into a nicer form. |
|
954 |
|
|
955 |
Returns: |
|
956 |
a dictionary of minor: joined lines from /proc/drbd for that minor |
|
957 |
|
|
958 |
""" |
|
959 |
lmatch = re.compile("^ *([0-9]+):.*$") |
|
960 |
results = {} |
|
961 |
old_minor = old_line = None |
|
962 |
for line in data: |
|
963 |
lresult = lmatch.match(line) |
|
964 |
if lresult is not None: |
|
965 |
if old_minor is not None: |
|
966 |
results[old_minor] = old_line |
|
967 |
old_minor = int(lresult.group(1)) |
|
968 |
old_line = line |
|
969 |
else: |
|
970 |
if old_minor is not None: |
|
971 |
old_line += " " + line.strip() |
|
972 |
# add last line |
|
973 |
if old_minor is not None: |
|
974 |
results[old_minor] = old_line |
|
975 |
return results |
|
976 |
|
|
977 |
@classmethod |
|
978 |
def _GetVersion(cls): |
|
979 |
"""Return the DRBD version. |
|
980 |
|
|
981 |
This will return a dict with keys: |
|
982 |
k_major, |
|
983 |
k_minor, |
|
984 |
k_point, |
|
985 |
api, |
|
986 |
proto, |
|
987 |
proto2 (only on drbd > 8.2.X) |
|
988 |
|
|
989 |
""" |
|
990 |
proc_data = cls._GetProcData() |
|
991 |
first_line = proc_data[0].strip() |
|
992 |
version = cls._VERSION_RE.match(first_line) |
|
993 |
if not version: |
|
994 |
raise errors.BlockDeviceError("Can't parse DRBD version from '%s'" % |
|
995 |
first_line) |
|
996 |
|
|
997 |
values = version.groups() |
|
998 |
retval = {'k_major': int(values[0]), |
|
999 |
'k_minor': int(values[1]), |
|
1000 |
'k_point': int(values[2]), |
|
1001 |
'api': int(values[3]), |
|
1002 |
'proto': int(values[4]), |
|
1003 |
} |
|
1004 |
if values[5] is not None: |
|
1005 |
retval['proto2'] = values[5] |
|
1006 |
|
|
1007 |
return retval |
|
1008 |
|
|
1009 |
@staticmethod |
|
1010 |
def _DevPath(minor): |
|
1011 |
"""Return the path to a drbd device for a given minor. |
|
1012 |
|
|
1013 |
""" |
|
1014 |
return "/dev/drbd%d" % minor |
|
1015 |
|
|
1016 |
@classmethod |
|
1017 |
def _GetUsedDevs(cls): |
|
1018 |
"""Compute the list of used DRBD devices. |
|
1019 |
|
|
1020 |
""" |
|
1021 |
data = cls._GetProcData() |
|
1022 |
|
|
1023 |
used_devs = {} |
|
1024 |
valid_line = re.compile("^ *([0-9]+): cs:([^ ]+).*$") |
|
1025 |
for line in data: |
|
1026 |
match = valid_line.match(line) |
|
1027 |
if not match: |
|
1028 |
continue |
|
1029 |
minor = int(match.group(1)) |
|
1030 |
state = match.group(2) |
|
1031 |
if state == cls._ST_UNCONFIGURED: |
|
1032 |
continue |
|
1033 |
used_devs[minor] = state, line |
|
1034 |
|
|
1035 |
return used_devs |
|
1036 |
|
|
1037 |
def _SetFromMinor(self, minor): |
|
1038 |
"""Set our parameters based on the given minor. |
|
1039 |
|
|
1040 |
This sets our minor variable and our dev_path. |
|
1041 |
|
|
1042 |
""" |
|
1043 |
if minor is None: |
|
1044 |
self.minor = self.dev_path = None |
|
1045 |
else: |
|
1046 |
self.minor = minor |
|
1047 |
self.dev_path = self._DevPath(minor) |
|
1048 |
|
|
1049 |
@staticmethod |
|
1050 |
def _CheckMetaSize(meta_device): |
|
1051 |
"""Check if the given meta device looks like a valid one. |
|
1052 |
|
|
1053 |
This currently only check the size, which must be around |
|
1054 |
128MiB. |
|
1055 |
|
|
1056 |
""" |
|
1057 |
result = utils.RunCmd(["blockdev", "--getsize", meta_device]) |
|
1058 |
if result.failed: |
|
1059 |
logger.Error("Failed to get device size: %s - %s" % |
|
1060 |
(result.fail_reason, result.output)) |
|
1061 |
return False |
|
1062 |
try: |
|
1063 |
sectors = int(result.stdout) |
|
1064 |
except ValueError: |
|
1065 |
logger.Error("Invalid output from blockdev: '%s'" % result.stdout) |
|
1066 |
return False |
|
1067 |
bytes = sectors * 512 |
|
1068 |
if bytes < 128 * 1024 * 1024: # less than 128MiB |
|
1069 |
logger.Error("Meta device too small (%.2fMib)" % (bytes / 1024 / 1024)) |
|
1070 |
return False |
|
1071 |
if bytes > (128 + 32) * 1024 * 1024: # account for an extra (big) PE on LVM |
|
1072 |
logger.Error("Meta device too big (%.2fMiB)" % (bytes / 1024 / 1024)) |
|
1073 |
return False |
|
1074 |
return True |
|
1075 |
|
|
1076 |
def Rename(self, new_id): |
|
1077 |
"""Rename a device. |
|
1078 |
|
|
1079 |
This is not supported for drbd devices. |
|
1080 |
|
|
1081 |
""" |
|
1082 |
raise errors.ProgrammerError("Can't rename a drbd device") |
|
1083 |
|
|
1084 |
|
|
1085 |
class DRBDev(BaseDRBD): |
|
1086 |
"""DRBD block device. |
|
1087 |
|
|
1088 |
This implements the local host part of the DRBD device, i.e. it |
|
1089 |
doesn't do anything to the supposed peer. If you need a fully |
|
1090 |
connected DRBD pair, you need to use this class on both hosts. |
|
1091 |
|
|
1092 |
The unique_id for the drbd device is the (local_ip, local_port, |
|
1093 |
remote_ip, remote_port) tuple, and it must have two children: the |
|
1094 |
data device and the meta_device. The meta device is checked for |
|
1095 |
valid size and is zeroed on create. |
|
1096 |
|
|
1097 |
""" |
|
1098 |
def __init__(self, unique_id, children): |
|
1099 |
super(DRBDev, self).__init__(unique_id, children) |
|
1100 |
self.major = self._DRBD_MAJOR |
|
1101 |
version = self._GetVersion() |
|
1102 |
if version['k_major'] != 0 and version['k_minor'] != 7: |
|
1103 |
raise errors.BlockDeviceError("Mismatch in DRBD kernel version and" |
|
1104 |
" requested ganeti usage: kernel is" |
|
1105 |
" %s.%s, ganeti wants 0.7" % |
|
1106 |
(version['k_major'], version['k_minor'])) |
|
1107 |
if len(children) != 2: |
|
1108 |
raise ValueError("Invalid configuration data %s" % str(children)) |
|
1109 |
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 4: |
|
1110 |
raise ValueError("Invalid configuration data %s" % str(unique_id)) |
|
1111 |
self._lhost, self._lport, self._rhost, self._rport = unique_id |
|
1112 |
self.Attach() |
|
1113 |
|
|
1114 |
@classmethod |
|
1115 |
def _FindUnusedMinor(cls): |
|
1116 |
"""Find an unused DRBD device. |
|
1117 |
|
|
1118 |
""" |
|
1119 |
data = cls._GetProcData() |
|
1120 |
|
|
1121 |
valid_line = re.compile("^ *([0-9]+): cs:Unconfigured$") |
|
1122 |
for line in data: |
|
1123 |
match = valid_line.match(line) |
|
1124 |
if match: |
|
1125 |
return int(match.group(1)) |
|
1126 |
logger.Error("Error: no free drbd minors!") |
|
1127 |
raise errors.BlockDeviceError("Can't find a free DRBD minor") |
|
1128 |
|
|
1129 |
@classmethod |
|
1130 |
def _GetDevInfo(cls, minor): |
|
1131 |
"""Get details about a given DRBD minor. |
|
1132 |
|
|
1133 |
This return, if available, the local backing device in (major, |
|
1134 |
minor) formant and the local and remote (ip, port) information. |
|
1135 |
|
|
1136 |
""" |
|
1137 |
data = {} |
|
1138 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"]) |
|
1139 |
if result.failed: |
|
1140 |
logger.Error("Can't display the drbd config: %s - %s" % |
|
1141 |
(result.fail_reason, result.output)) |
|
1142 |
return data |
|
1143 |
out = result.stdout |
|
1144 |
if out == "Not configured\n": |
|
1145 |
return data |
|
1146 |
for line in out.splitlines(): |
|
1147 |
if "local_dev" not in data: |
|
1148 |
match = re.match("^Lower device: ([0-9]+):([0-9]+) .*$", line) |
|
1149 |
if match: |
|
1150 |
data["local_dev"] = (int(match.group(1)), int(match.group(2))) |
|
1151 |
continue |
|
1152 |
if "meta_dev" not in data: |
|
1153 |
match = re.match("^Meta device: (([0-9]+):([0-9]+)|internal).*$", line) |
|
1154 |
if match: |
|
1155 |
if match.group(2) is not None and match.group(3) is not None: |
|
1156 |
# matched on the major/minor |
|
1157 |
data["meta_dev"] = (int(match.group(2)), int(match.group(3))) |
|
1158 |
else: |
|
1159 |
# matched on the "internal" string |
|
1160 |
data["meta_dev"] = match.group(1) |
|
1161 |
# in this case, no meta_index is in the output |
|
1162 |
data["meta_index"] = -1 |
|
1163 |
continue |
|
1164 |
if "meta_index" not in data: |
|
1165 |
match = re.match("^Meta index: ([0-9]+).*$", line) |
|
1166 |
if match: |
|
1167 |
data["meta_index"] = int(match.group(1)) |
|
1168 |
continue |
|
1169 |
if "local_addr" not in data: |
|
1170 |
match = re.match("^Local address: ([0-9.]+):([0-9]+)$", line) |
|
1171 |
if match: |
|
1172 |
data["local_addr"] = (match.group(1), int(match.group(2))) |
|
1173 |
continue |
|
1174 |
if "remote_addr" not in data: |
|
1175 |
match = re.match("^Remote address: ([0-9.]+):([0-9]+)$", line) |
|
1176 |
if match: |
|
1177 |
data["remote_addr"] = (match.group(1), int(match.group(2))) |
|
1178 |
continue |
|
1179 |
return data |
|
1180 |
|
|
1181 |
def _MatchesLocal(self, info): |
|
1182 |
"""Test if our local config matches with an existing device. |
|
1183 |
|
|
1184 |
The parameter should be as returned from `_GetDevInfo()`. This |
|
1185 |
method tests if our local backing device is the same as the one in |
|
1186 |
the info parameter, in effect testing if we look like the given |
|
1187 |
device. |
|
1188 |
|
|
1189 |
""" |
|
1190 |
if not ("local_dev" in info and "meta_dev" in info and |
|
1191 |
"meta_index" in info): |
|
1192 |
return False |
|
1193 |
|
|
1194 |
backend = self._children[0] |
|
1195 |
if backend is not None: |
|
1196 |
retval = (info["local_dev"] == (backend.major, backend.minor)) |
|
1197 |
else: |
|
1198 |
retval = (info["local_dev"] == (0, 0)) |
|
1199 |
meta = self._children[1] |
|
1200 |
if meta is not None: |
|
1201 |
retval = retval and (info["meta_dev"] == (meta.major, meta.minor)) |
|
1202 |
retval = retval and (info["meta_index"] == 0) |
|
1203 |
else: |
|
1204 |
retval = retval and (info["meta_dev"] == "internal" and |
|
1205 |
info["meta_index"] == -1) |
|
1206 |
return retval |
|
1207 |
|
|
1208 |
def _MatchesNet(self, info): |
|
1209 |
"""Test if our network config matches with an existing device. |
|
1210 |
|
|
1211 |
The parameter should be as returned from `_GetDevInfo()`. This |
|
1212 |
method tests if our network configuration is the same as the one |
|
1213 |
in the info parameter, in effect testing if we look like the given |
|
1214 |
device. |
|
1215 |
|
|
1216 |
""" |
|
1217 |
if (((self._lhost is None and not ("local_addr" in info)) and |
|
1218 |
(self._rhost is None and not ("remote_addr" in info)))): |
|
1219 |
return True |
|
1220 |
|
|
1221 |
if self._lhost is None: |
|
1222 |
return False |
|
1223 |
|
|
1224 |
if not ("local_addr" in info and |
|
1225 |
"remote_addr" in info): |
|
1226 |
return False |
|
1227 |
|
|
1228 |
retval = (info["local_addr"] == (self._lhost, self._lport)) |
|
1229 |
retval = (retval and |
|
1230 |
info["remote_addr"] == (self._rhost, self._rport)) |
|
1231 |
return retval |
|
1232 |
|
|
1233 |
@classmethod |
|
1234 |
def _AssembleLocal(cls, minor, backend, meta): |
|
1235 |
"""Configure the local part of a DRBD device. |
|
1236 |
|
|
1237 |
This is the first thing that must be done on an unconfigured DRBD |
|
1238 |
device. And it must be done only once. |
|
1239 |
|
|
1240 |
""" |
|
1241 |
if not cls._CheckMetaSize(meta): |
|
1242 |
return False |
|
1243 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disk", |
|
1244 |
backend, meta, "0", "-e", "detach"]) |
|
1245 |
if result.failed: |
|
1246 |
logger.Error("Can't attach local disk: %s" % result.output) |
|
1247 |
return not result.failed |
|
1248 |
|
|
1249 |
@classmethod |
|
1250 |
def _ShutdownLocal(cls, minor): |
|
1251 |
"""Detach from the local device. |
|
1252 |
|
|
1253 |
I/Os will continue to be served from the remote device. If we |
|
1254 |
don't have a remote device, this operation will fail. |
|
1255 |
|
|
1256 |
""" |
|
1257 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "detach"]) |
|
1258 |
if result.failed: |
|
1259 |
logger.Error("Can't detach local device: %s" % result.output) |
|
1260 |
return not result.failed |
|
1261 |
|
|
1262 |
@staticmethod |
|
1263 |
def _ShutdownAll(minor): |
|
1264 |
"""Deactivate the device. |
|
1265 |
|
|
1266 |
This will, of course, fail if the device is in use. |
|
1267 |
|
|
1268 |
""" |
|
1269 |
result = utils.RunCmd(["drbdsetup", DRBDev._DevPath(minor), "down"]) |
|
1270 |
if result.failed: |
|
1271 |
logger.Error("Can't shutdown drbd device: %s" % result.output) |
|
1272 |
return not result.failed |
|
1273 |
|
|
1274 |
@classmethod |
|
1275 |
def _AssembleNet(cls, minor, net_info, protocol): |
|
1276 |
"""Configure the network part of the device. |
|
1277 |
|
|
1278 |
This operation can be, in theory, done multiple times, but there |
|
1279 |
have been cases (in lab testing) in which the network part of the |
|
1280 |
device had become stuck and couldn't be shut down because activity |
|
1281 |
from the new peer (also stuck) triggered a timer re-init and |
|
1282 |
needed remote peer interface shutdown in order to clear. So please |
|
1283 |
don't change online the net config. |
|
1284 |
|
|
1285 |
""" |
|
1286 |
lhost, lport, rhost, rport = net_info |
|
1287 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "net", |
|
1288 |
"%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), |
|
1289 |
protocol]) |
|
1290 |
if result.failed: |
|
1291 |
logger.Error("Can't setup network for dbrd device: %s - %s" % |
|
1292 |
(result.fail_reason, result.output)) |
|
1293 |
return False |
|
1294 |
|
|
1295 |
timeout = time.time() + 10 |
|
1296 |
ok = False |
|
1297 |
while time.time() < timeout: |
|
1298 |
info = cls._GetDevInfo(minor) |
|
1299 |
if not "local_addr" in info or not "remote_addr" in info: |
|
1300 |
time.sleep(1) |
|
1301 |
continue |
|
1302 |
if (info["local_addr"] != (lhost, lport) or |
|
1303 |
info["remote_addr"] != (rhost, rport)): |
|
1304 |
time.sleep(1) |
|
1305 |
continue |
|
1306 |
ok = True |
|
1307 |
break |
|
1308 |
if not ok: |
|
1309 |
logger.Error("Timeout while configuring network") |
|
1310 |
return False |
|
1311 |
return True |
|
1312 |
|
|
1313 |
@classmethod |
|
1314 |
def _ShutdownNet(cls, minor): |
|
1315 |
"""Disconnect from the remote peer. |
|
1316 |
|
|
1317 |
This fails if we don't have a local device. |
|
1318 |
|
|
1319 |
""" |
|
1320 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disconnect"]) |
|
1321 |
if result.failed: |
|
1322 |
logger.Error("Can't shutdown network: %s" % result.output) |
|
1323 |
return not result.failed |
|
1324 |
|
|
1325 |
def Assemble(self): |
|
1326 |
"""Assemble the drbd. |
|
1327 |
|
|
1328 |
Method: |
|
1329 |
- if we have a local backing device, we bind to it by: |
|
1330 |
- checking the list of used drbd devices |
|
1331 |
- check if the local minor use of any of them is our own device |
|
1332 |
- if yes, abort? |
|
1333 |
- if not, bind |
|
1334 |
- if we have a local/remote net info: |
|
1335 |
- redo the local backing device step for the remote device |
|
1336 |
- check if any drbd device is using the local port, |
|
1337 |
if yes abort |
|
1338 |
- check if any remote drbd device is using the remote |
|
1339 |
port, if yes abort (for now) |
|
1340 |
- bind our net port |
|
1341 |
- bind the remote net port |
|
1342 |
|
|
1343 |
""" |
|
1344 |
self.Attach() |
|
1345 |
if self.minor is not None: |
|
1346 |
logger.Info("Already assembled") |
|
1347 |
return True |
|
1348 |
|
|
1349 |
result = super(DRBDev, self).Assemble() |
|
1350 |
if not result: |
|
1351 |
return result |
|
529 |
""" |
|
530 |
_VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)" |
|
531 |
r" \(api:(\d+)/proto:(\d+)(?:-(\d+))?\)") |
|
1352 | 532 |
|
1353 |
minor = self._FindUnusedMinor() |
|
1354 |
need_localdev_teardown = False |
|
1355 |
if self._children[0]: |
|
1356 |
result = self._AssembleLocal(minor, self._children[0].dev_path, |
|
1357 |
self._children[1].dev_path) |
|
1358 |
if not result: |
|
1359 |
return False |
|
1360 |
need_localdev_teardown = True |
|
1361 |
if self._lhost and self._lport and self._rhost and self._rport: |
|
1362 |
result = self._AssembleNet(minor, |
|
1363 |
(self._lhost, self._lport, |
|
1364 |
self._rhost, self._rport), |
|
1365 |
"C") |
|
1366 |
if not result: |
|
1367 |
if need_localdev_teardown: |
|
1368 |
# we will ignore failures from this |
|
1369 |
logger.Error("net setup failed, tearing down local device") |
|
1370 |
self._ShutdownAll(minor) |
|
1371 |
return False |
|
1372 |
self._SetFromMinor(minor) |
|
1373 |
return True |
|
533 |
_DRBD_MAJOR = 147 |
|
534 |
_ST_UNCONFIGURED = "Unconfigured" |
|
535 |
_ST_WFCONNECTION = "WFConnection" |
|
536 |
_ST_CONNECTED = "Connected" |
|
1374 | 537 |
|
1375 |
def Shutdown(self): |
|
1376 |
"""Shutdown the DRBD device. |
|
538 |
@staticmethod |
|
539 |
def _GetProcData(): |
|
540 |
"""Return data from /proc/drbd. |
|
1377 | 541 |
|
1378 | 542 |
""" |
1379 |
if self.minor is None and not self.Attach():
|
|
1380 |
logger.Info("DRBD device not attached to a device during Shutdown")
|
|
1381 |
return True
|
|
1382 |
if not self._ShutdownAll(self.minor):
|
|
1383 |
return False
|
|
1384 |
self.minor = None
|
|
1385 |
self.dev_path = None
|
|
1386 |
return True
|
|
543 |
stat = open("/proc/drbd", "r")
|
|
544 |
try:
|
|
545 |
data = stat.read().splitlines()
|
|
546 |
finally:
|
|
547 |
stat.close()
|
|
548 |
if not data:
|
|
549 |
raise errors.BlockDeviceError("Can't read any data from /proc/drbd")
|
|
550 |
return data
|
|
1387 | 551 |
|
1388 |
def Attach(self): |
|
1389 |
"""Find a DRBD device which matches our config and attach to it. |
|
552 |
@staticmethod |
|
553 |
def _MassageProcData(data): |
|
554 |
"""Transform the output of _GetProdData into a nicer form. |
|
1390 | 555 |
|
1391 |
In case of partially attached (local device matches but no network |
|
1392 |
setup), we perform the network attach. If successful, we re-test |
|
1393 |
the attach if can return success. |
|
556 |
Returns: |
|
557 |
a dictionary of minor: joined lines from /proc/drbd for that minor |
|
1394 | 558 |
|
1395 | 559 |
""" |
1396 |
for minor in self._GetUsedDevs(): |
|
1397 |
info = self._GetDevInfo(minor) |
|
1398 |
match_l = self._MatchesLocal(info) |
|
1399 |
match_r = self._MatchesNet(info) |
|
1400 |
if match_l and match_r: |
|
1401 |
break |
|
1402 |
if match_l and not match_r and "local_addr" not in info: |
|
1403 |
res_r = self._AssembleNet(minor, |
|
1404 |
(self._lhost, self._lport, |
|
1405 |
self._rhost, self._rport), |
|
1406 |
"C") |
|
1407 |
if res_r and self._MatchesNet(self._GetDevInfo(minor)): |
|
1408 |
break |
|
1409 |
else: |
|
1410 |
minor = None |
|
1411 |
|
|
1412 |
self._SetFromMinor(minor) |
|
1413 |
return minor is not None |
|
560 |
lmatch = re.compile("^ *([0-9]+):.*$") |
|
561 |
results = {} |
|
562 |
old_minor = old_line = None |
|
563 |
for line in data: |
|
564 |
lresult = lmatch.match(line) |
|
565 |
if lresult is not None: |
|
566 |
if old_minor is not None: |
|
567 |
results[old_minor] = old_line |
|
568 |
old_minor = int(lresult.group(1)) |
|
569 |
old_line = line |
|
570 |
else: |
|
571 |
if old_minor is not None: |
|
572 |
old_line += " " + line.strip() |
|
573 |
# add last line |
|
574 |
if old_minor is not None: |
|
575 |
results[old_minor] = old_line |
|
576 |
return results |
|
1414 | 577 |
|
1415 |
def Open(self, force=False): |
|
1416 |
"""Make the local state primary. |
|
578 |
@classmethod |
|
579 |
def _GetVersion(cls): |
|
580 |
"""Return the DRBD version. |
|
1417 | 581 |
|
1418 |
If the 'force' parameter is given, the '--do-what-I-say' parameter |
|
1419 |
is given. Since this is a pottentialy dangerous operation, the |
|
1420 |
force flag should be only given after creation, when it actually |
|
1421 |
has to be given. |
|
582 |
This will return a dict with keys: |
|
583 |
k_major, |
|
584 |
k_minor, |
|
585 |
k_point, |
|
586 |
api, |
|
587 |
proto, |
|
588 |
proto2 (only on drbd > 8.2.X) |
|
1422 | 589 |
|
1423 | 590 |
""" |
1424 |
if self.minor is None and not self.Attach(): |
|
1425 |
logger.Error("DRBD cannot attach to a device during open") |
|
1426 |
return False |
|
1427 |
cmd = ["drbdsetup", self.dev_path, "primary"] |
|
1428 |
if force: |
|
1429 |
cmd.append("--do-what-I-say") |
|
1430 |
result = utils.RunCmd(cmd) |
|
1431 |
if result.failed: |
|
1432 |
msg = ("Can't make drbd device primary: %s" % result.output) |
|
1433 |
logger.Error(msg) |
|
1434 |
raise errors.BlockDeviceError(msg) |
|
591 |
proc_data = cls._GetProcData() |
|
592 |
first_line = proc_data[0].strip() |
|
593 |
version = cls._VERSION_RE.match(first_line) |
|
594 |
if not version: |
|
595 |
raise errors.BlockDeviceError("Can't parse DRBD version from '%s'" % |
|
596 |
first_line) |
|
1435 | 597 |
|
1436 |
def Close(self): |
|
1437 |
"""Make the local state secondary. |
|
598 |
values = version.groups() |
|
599 |
retval = {'k_major': int(values[0]), |
|
600 |
'k_minor': int(values[1]), |
|
601 |
'k_point': int(values[2]), |
|
602 |
'api': int(values[3]), |
|
603 |
'proto': int(values[4]), |
|
604 |
} |
|
605 |
if values[5] is not None: |
|
606 |
retval['proto2'] = values[5] |
|
1438 | 607 |
|
1439 |
This will, of course, fail if the device is in use. |
|
608 |
return retval |
|
609 |
|
|
610 |
@staticmethod |
|
611 |
def _DevPath(minor): |
|
612 |
"""Return the path to a drbd device for a given minor. |
|
1440 | 613 |
|
1441 | 614 |
""" |
1442 |
if self.minor is None and not self.Attach(): |
|
1443 |
logger.Info("Instance not attached to a device") |
|
1444 |
raise errors.BlockDeviceError("Can't find device") |
|
1445 |
result = utils.RunCmd(["drbdsetup", self.dev_path, "secondary"]) |
|
1446 |
if result.failed: |
|
1447 |
msg = ("Can't switch drbd device to" |
|
1448 |
" secondary: %s" % result.output) |
|
1449 |
logger.Error(msg) |
|
1450 |
raise errors.BlockDeviceError(msg) |
|
615 |
return "/dev/drbd%d" % minor |
|
1451 | 616 |
|
1452 |
def SetSyncSpeed(self, kbytes): |
|
1453 |
"""Set the speed of the DRBD syncer. |
|
617 |
@classmethod |
|
618 |
def _GetUsedDevs(cls): |
|
619 |
"""Compute the list of used DRBD devices. |
|
1454 | 620 |
|
1455 | 621 |
""" |
1456 |
children_result = super(DRBDev, self).SetSyncSpeed(kbytes) |
|
1457 |
if self.minor is None: |
|
1458 |
logger.Info("Instance not attached to a device") |
|
1459 |
return False |
|
1460 |
result = utils.RunCmd(["drbdsetup", self.dev_path, "syncer", "-r", "%d" % |
|
1461 |
kbytes]) |
|
1462 |
if result.failed: |
|
1463 |
logger.Error("Can't change syncer rate: %s - %s" % |
|
1464 |
(result.fail_reason, result.output)) |
|
1465 |
return not result.failed and children_result |
|
622 |
data = cls._GetProcData() |
|
1466 | 623 |
|
1467 |
def GetSyncStatus(self): |
|
1468 |
"""Returns the sync status of the device. |
|
624 |
used_devs = {} |
|
625 |
valid_line = re.compile("^ *([0-9]+): cs:([^ ]+).*$") |
|
626 |
for line in data: |
|
627 |
match = valid_line.match(line) |
|
628 |
if not match: |
|
629 |
continue |
|
630 |
minor = int(match.group(1)) |
|
631 |
state = match.group(2) |
|
632 |
if state == cls._ST_UNCONFIGURED: |
|
633 |
continue |
|
634 |
used_devs[minor] = state, line |
|
1469 | 635 |
|
1470 |
Returns: |
|
1471 |
(sync_percent, estimated_time, is_degraded, ldisk) |
|
636 |
return used_devs |
|
1472 | 637 |
|
1473 |
If sync_percent is None, it means all is ok |
|
1474 |
If estimated_time is None, it means we can't esimate |
|
1475 |
the time needed, otherwise it's the time left in seconds. |
|
638 |
def _SetFromMinor(self, minor): |
|
639 |
"""Set our parameters based on the given minor. |
|
1476 | 640 |
|
1477 |
The ldisk parameter will be returned as True, since the DRBD7 |
|
1478 |
devices have not been converted. |
|
641 |
This sets our minor variable and our dev_path. |
|
1479 | 642 |
|
1480 | 643 |
""" |
1481 |
if self.minor is None and not self.Attach(): |
|
1482 |
raise errors.BlockDeviceError("Can't attach to device in GetSyncStatus") |
|
1483 |
proc_info = self._MassageProcData(self._GetProcData()) |
|
1484 |
if self.minor not in proc_info: |
|
1485 |
raise errors.BlockDeviceError("Can't find myself in /proc (minor %d)" % |
|
1486 |
self.minor) |
|
1487 |
line = proc_info[self.minor] |
|
1488 |
match = re.match("^.*sync'ed: *([0-9.]+)%.*" |
|
1489 |
" finish: ([0-9]+):([0-9]+):([0-9]+) .*$", line) |
|
1490 |
if match: |
|
1491 |
sync_percent = float(match.group(1)) |
|
1492 |
hours = int(match.group(2)) |
|
1493 |
minutes = int(match.group(3)) |
|
1494 |
seconds = int(match.group(4)) |
|
1495 |
est_time = hours * 3600 + minutes * 60 + seconds |
|
644 |
if minor is None: |
|
645 |
self.minor = self.dev_path = None |
|
1496 | 646 |
else: |
1497 |
sync_percent = None |
|
1498 |
est_time = None |
|
1499 |
match = re.match("^ *[0-9]+: cs:([^ ]+).*$", line) |
|
1500 |
if not match: |
|
1501 |
raise errors.BlockDeviceError("Can't find my data in /proc (minor %d)" % |
|
1502 |
self.minor) |
|
1503 |
client_state = match.group(1) |
|
1504 |
is_degraded = client_state != "Connected" |
|
1505 |
return sync_percent, est_time, is_degraded, False |
|
647 |
self.minor = minor |
|
648 |
self.dev_path = self._DevPath(minor) |
|
1506 | 649 |
|
1507 | 650 |
@staticmethod |
1508 |
def _ZeroDevice(device):
|
|
1509 |
"""Zero a device.
|
|
651 |
def _CheckMetaSize(meta_device):
|
|
652 |
"""Check if the given meta device looks like a valid one.
|
|
1510 | 653 |
|
1511 |
This writes until we get ENOSPC. |
|
654 |
This currently only check the size, which must be around |
|
655 |
128MiB. |
|
1512 | 656 |
|
1513 | 657 |
""" |
1514 |
f = open(device, "w") |
|
1515 |
buf = "\0" * 1048576 |
|
658 |
result = utils.RunCmd(["blockdev", "--getsize", meta_device]) |
|
659 |
if result.failed: |
|
660 |
logger.Error("Failed to get device size: %s - %s" % |
|
661 |
(result.fail_reason, result.output)) |
|
662 |
return False |
|
1516 | 663 |
try: |
1517 |
while True:
|
|
1518 |
f.write(buf)
|
|
1519 |
except IOError, err:
|
|
1520 |
if err.errno != errno.ENOSPC:
|
|
1521 |
raise
|
|
1522 |
|
|
1523 |
@classmethod
|
|
1524 |
def Create(cls, unique_id, children, size):
|
|
1525 |
"""Create a new DRBD device.
|
|
1526 |
|
|
1527 |
Since DRBD devices are not created per se, just assembled, this
|
|
1528 |
function just zeroes the meta device.
|
|
664 |
sectors = int(result.stdout)
|
|
665 |
except ValueError:
|
|
666 |
logger.Error("Invalid output from blockdev: '%s'" % result.stdout)
|
|
667 |
return False
|
|
668 |
bytes = sectors * 512
|
|
669 |
if bytes < 128 * 1024 * 1024: # less than 128MiB |
|
670 |
logger.Error("Meta device too small (%.2fMib)" % (bytes / 1024 / 1024))
|
|
671 |
return False
|
|
672 |
if bytes > (128 + 32) * 1024 * 1024: # account for an extra (big) PE on LVM
|
|
673 |
logger.Error("Meta device too big (%.2fMiB)" % (bytes / 1024 / 1024)) |
|
674 |
return False
|
|
675 |
return True
|
|
1529 | 676 |
|
1530 |
""" |
|
1531 |
if len(children) != 2: |
|
1532 |
raise errors.ProgrammerError("Invalid setup for the drbd device") |
|
1533 |
meta = children[1] |
|
1534 |
meta.Assemble() |
|
1535 |
if not meta.Attach(): |
|
1536 |
raise errors.BlockDeviceError("Can't attach to meta device") |
|
1537 |
if not cls._CheckMetaSize(meta.dev_path): |
|
1538 |
raise errors.BlockDeviceError("Invalid meta device") |
|
1539 |
logger.Info("Started zeroing device %s" % meta.dev_path) |
|
1540 |
cls._ZeroDevice(meta.dev_path) |
|
1541 |
logger.Info("Done zeroing device %s" % meta.dev_path) |
|
1542 |
return cls(unique_id, children) |
|
677 |
def Rename(self, new_id): |
|
678 |
"""Rename a device. |
|
1543 | 679 |
|
1544 |
def Remove(self): |
|
1545 |
"""Stub remove for DRBD devices. |
|
680 |
This is not supported for drbd devices. |
|
1546 | 681 |
|
1547 | 682 |
""" |
1548 |
return self.Shutdown()
|
|
683 |
raise errors.ProgrammerError("Can't rename a drbd device")
|
|
1549 | 684 |
|
1550 | 685 |
|
1551 | 686 |
class DRBD8(BaseDRBD): |
... | ... | |
2198 | 1333 |
|
2199 | 1334 |
class FileStorage(BlockDev): |
2200 | 1335 |
"""File device. |
2201 |
|
|
1336 |
|
|
2202 | 1337 |
This class represents the a file storage backend device. |
2203 | 1338 |
|
2204 | 1339 |
The unique_id for the file device is a (file_driver, file_path) tuple. |
2205 |
|
|
1340 |
|
|
2206 | 1341 |
""" |
2207 | 1342 |
def __init__(self, unique_id, children): |
2208 | 1343 |
"""Initalizes a file device backend. |
... | ... | |
2310 | 1445 |
|
2311 | 1446 |
DEV_MAP = { |
2312 | 1447 |
constants.LD_LV: LogicalVolume, |
2313 |
constants.LD_MD_R1: MDRaid1, |
|
2314 |
constants.LD_DRBD7: DRBDev, |
|
2315 | 1448 |
constants.LD_DRBD8: DRBD8, |
2316 | 1449 |
constants.LD_FILE: FileStorage, |
2317 | 1450 |
} |
Also available in: Unified diff