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1 | a8083063 | Iustin Pop | #!/usr/bin/python
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2 | a8083063 | Iustin Pop | #
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3 | a8083063 | Iustin Pop | |
4 | a8083063 | Iustin Pop | # Copyright (C) 2006, 2007 Google Inc.
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5 | a8083063 | Iustin Pop | #
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6 | a8083063 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
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7 | a8083063 | Iustin Pop | # it under the terms of the GNU General Public License as published by
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8 | a8083063 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
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9 | a8083063 | Iustin Pop | # (at your option) any later version.
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10 | a8083063 | Iustin Pop | #
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11 | a8083063 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
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12 | a8083063 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | a8083063 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | a8083063 | Iustin Pop | # General Public License for more details.
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15 | a8083063 | Iustin Pop | #
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16 | a8083063 | Iustin Pop | # You should have received a copy of the GNU General Public License
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17 | a8083063 | Iustin Pop | # along with this program; if not, write to the Free Software
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18 | a8083063 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | a8083063 | Iustin Pop | # 02110-1301, USA.
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20 | a8083063 | Iustin Pop | |
21 | a8083063 | Iustin Pop | |
22 | a8083063 | Iustin Pop | """Block device abstraction"""
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23 | a8083063 | Iustin Pop | |
24 | a8083063 | Iustin Pop | import re |
25 | a8083063 | Iustin Pop | import time |
26 | a8083063 | Iustin Pop | import errno |
27 | a8083063 | Iustin Pop | |
28 | a8083063 | Iustin Pop | from ganeti import utils |
29 | a8083063 | Iustin Pop | from ganeti import logger |
30 | a8083063 | Iustin Pop | from ganeti import errors |
31 | a8083063 | Iustin Pop | |
32 | a8083063 | Iustin Pop | |
33 | a8083063 | Iustin Pop | class BlockDev(object): |
34 | a8083063 | Iustin Pop | """Block device abstract class.
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35 | a8083063 | Iustin Pop |
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36 | a8083063 | Iustin Pop | A block device can be in the following states:
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37 | a8083063 | Iustin Pop | - not existing on the system, and by `Create()` it goes into:
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38 | a8083063 | Iustin Pop | - existing but not setup/not active, and by `Assemble()` goes into:
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39 | a8083063 | Iustin Pop | - active read-write and by `Open()` it goes into
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40 | a8083063 | Iustin Pop | - online (=used, or ready for use)
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41 | a8083063 | Iustin Pop |
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42 | a8083063 | Iustin Pop | A device can also be online but read-only, however we are not using
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43 | a8083063 | Iustin Pop | the readonly state (MD and LV have it, if needed in the future)
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44 | a8083063 | Iustin Pop | and we are usually looking at this like at a stack, so it's easier
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45 | a8083063 | Iustin Pop | to conceptualise the transition from not-existing to online and back
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46 | a8083063 | Iustin Pop | like a linear one.
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47 | a8083063 | Iustin Pop |
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48 | a8083063 | Iustin Pop | The many different states of the device are due to the fact that we
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49 | a8083063 | Iustin Pop | need to cover many device types:
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50 | a8083063 | Iustin Pop | - logical volumes are created, lvchange -a y $lv, and used
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51 | a8083063 | Iustin Pop | - md arrays are created or assembled and used
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52 | a8083063 | Iustin Pop | - drbd devices are attached to a local disk/remote peer and made primary
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53 | a8083063 | Iustin Pop |
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54 | a8083063 | Iustin Pop | The status of the device can be examined by `GetStatus()`, which
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55 | a8083063 | Iustin Pop | returns a numerical value, depending on the position in the
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56 | a8083063 | Iustin Pop | transition stack of the device.
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57 | a8083063 | Iustin Pop |
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58 | a8083063 | Iustin Pop | A block device is identified by three items:
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59 | a8083063 | Iustin Pop | - the /dev path of the device (dynamic)
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60 | a8083063 | Iustin Pop | - a unique ID of the device (static)
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61 | a8083063 | Iustin Pop | - it's major/minor pair (dynamic)
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62 | a8083063 | Iustin Pop |
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63 | a8083063 | Iustin Pop | Not all devices implement both the first two as distinct items. LVM
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64 | a8083063 | Iustin Pop | logical volumes have their unique ID (the pair volume group, logical
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65 | a8083063 | Iustin Pop | volume name) in a 1-to-1 relation to the dev path. For MD devices,
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66 | a8083063 | Iustin Pop | the /dev path is dynamic and the unique ID is the UUID generated at
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67 | a8083063 | Iustin Pop | array creation plus the slave list. For DRBD devices, the /dev path
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68 | a8083063 | Iustin Pop | is again dynamic and the unique id is the pair (host1, dev1),
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69 | a8083063 | Iustin Pop | (host2, dev2).
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70 | a8083063 | Iustin Pop |
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71 | a8083063 | Iustin Pop | You can get to a device in two ways:
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72 | a8083063 | Iustin Pop | - creating the (real) device, which returns you
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73 | a8083063 | Iustin Pop | an attached instance (lvcreate, mdadm --create)
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74 | a8083063 | Iustin Pop | - attaching of a python instance to an existing (real) device
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75 | a8083063 | Iustin Pop |
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76 | a8083063 | Iustin Pop | The second point, the attachement to a device, is different
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77 | a8083063 | Iustin Pop | depending on whether the device is assembled or not. At init() time,
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78 | a8083063 | Iustin Pop | we search for a device with the same unique_id as us. If found,
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79 | a8083063 | Iustin Pop | good. It also means that the device is already assembled. If not,
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80 | a8083063 | Iustin Pop | after assembly we'll have our correct major/minor.
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81 | a8083063 | Iustin Pop |
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82 | a8083063 | Iustin Pop | """
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83 | a8083063 | Iustin Pop | |
84 | a8083063 | Iustin Pop | STATUS_UNKNOWN = 0
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85 | a8083063 | Iustin Pop | STATUS_EXISTING = 1
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86 | a8083063 | Iustin Pop | STATUS_STANDBY = 2
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87 | a8083063 | Iustin Pop | STATUS_ONLINE = 3
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88 | a8083063 | Iustin Pop | |
89 | a8083063 | Iustin Pop | STATUS_MAP = { |
90 | a8083063 | Iustin Pop | STATUS_UNKNOWN: "unknown",
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91 | a8083063 | Iustin Pop | STATUS_EXISTING: "existing",
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92 | a8083063 | Iustin Pop | STATUS_STANDBY: "ready for use",
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93 | a8083063 | Iustin Pop | STATUS_ONLINE: "online",
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94 | a8083063 | Iustin Pop | } |
95 | a8083063 | Iustin Pop | |
96 | a8083063 | Iustin Pop | |
97 | a8083063 | Iustin Pop | def __init__(self, unique_id, children): |
98 | a8083063 | Iustin Pop | self._children = children
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99 | a8083063 | Iustin Pop | self.dev_path = None |
100 | a8083063 | Iustin Pop | self.unique_id = unique_id
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101 | a8083063 | Iustin Pop | self.major = None |
102 | a8083063 | Iustin Pop | self.minor = None |
103 | a8083063 | Iustin Pop | |
104 | a8083063 | Iustin Pop | |
105 | a8083063 | Iustin Pop | def Assemble(self): |
106 | a8083063 | Iustin Pop | """Assemble the device from its components.
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107 | a8083063 | Iustin Pop |
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108 | a8083063 | Iustin Pop | If this is a plain block device (e.g. LVM) than assemble does
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109 | a8083063 | Iustin Pop | nothing, as the LVM has no children and we don't put logical
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110 | a8083063 | Iustin Pop | volumes offline.
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111 | a8083063 | Iustin Pop |
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112 | a8083063 | Iustin Pop | One guarantee is that after the device has been assembled, it
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113 | a8083063 | Iustin Pop | knows its major/minor numbers. This allows other devices (usually
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114 | a8083063 | Iustin Pop | parents) to probe correctly for their children.
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115 | a8083063 | Iustin Pop |
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116 | a8083063 | Iustin Pop | """
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117 | a8083063 | Iustin Pop | status = True
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118 | a8083063 | Iustin Pop | for child in self._children: |
119 | a8083063 | Iustin Pop | if not isinstance(child, BlockDev): |
120 | a8083063 | Iustin Pop | raise TypeError("Invalid child passed of type '%s'" % type(child)) |
121 | a8083063 | Iustin Pop | if not status: |
122 | a8083063 | Iustin Pop | break
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123 | a8083063 | Iustin Pop | status = status and child.Assemble()
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124 | a8083063 | Iustin Pop | if not status: |
125 | a8083063 | Iustin Pop | break
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126 | a8083063 | Iustin Pop | status = status and child.Open()
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127 | a8083063 | Iustin Pop | |
128 | a8083063 | Iustin Pop | if not status: |
129 | a8083063 | Iustin Pop | for child in self._children: |
130 | a8083063 | Iustin Pop | child.Shutdown() |
131 | a8083063 | Iustin Pop | return status
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132 | a8083063 | Iustin Pop | |
133 | a8083063 | Iustin Pop | |
134 | a8083063 | Iustin Pop | def Attach(self): |
135 | a8083063 | Iustin Pop | """Find a device which matches our config and attach to it.
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136 | a8083063 | Iustin Pop |
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137 | a8083063 | Iustin Pop | """
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138 | a8083063 | Iustin Pop | raise NotImplementedError |
139 | a8083063 | Iustin Pop | |
140 | a8083063 | Iustin Pop | |
141 | a8083063 | Iustin Pop | def Close(self): |
142 | a8083063 | Iustin Pop | """Notifies that the device will no longer be used for I/O.
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143 | a8083063 | Iustin Pop |
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144 | a8083063 | Iustin Pop | """
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145 | a8083063 | Iustin Pop | raise NotImplementedError |
146 | a8083063 | Iustin Pop | |
147 | a8083063 | Iustin Pop | |
148 | a8083063 | Iustin Pop | @classmethod
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149 | a8083063 | Iustin Pop | def Create(cls, unique_id, children, size): |
150 | a8083063 | Iustin Pop | """Create the device.
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151 | a8083063 | Iustin Pop |
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152 | a8083063 | Iustin Pop | If the device cannot be created, it will return None
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153 | a8083063 | Iustin Pop | instead. Error messages go to the logging system.
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154 | a8083063 | Iustin Pop |
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155 | a8083063 | Iustin Pop | Note that for some devices, the unique_id is used, and for other,
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156 | a8083063 | Iustin Pop | the children. The idea is that these two, taken together, are
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157 | a8083063 | Iustin Pop | enough for both creation and assembly (later).
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158 | a8083063 | Iustin Pop |
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159 | a8083063 | Iustin Pop | """
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160 | a8083063 | Iustin Pop | raise NotImplementedError |
161 | a8083063 | Iustin Pop | |
162 | a8083063 | Iustin Pop | |
163 | a8083063 | Iustin Pop | def Remove(self): |
164 | a8083063 | Iustin Pop | """Remove this device.
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165 | a8083063 | Iustin Pop |
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166 | a8083063 | Iustin Pop | This makes sense only for some of the device types: LV and to a
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167 | a8083063 | Iustin Pop | lesser degree, md devices. Also note that if the device can't
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168 | a8083063 | Iustin Pop | attach, the removal can't be completed.
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169 | a8083063 | Iustin Pop |
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170 | a8083063 | Iustin Pop | """
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171 | a8083063 | Iustin Pop | raise NotImplementedError |
172 | a8083063 | Iustin Pop | |
173 | a8083063 | Iustin Pop | |
174 | a8083063 | Iustin Pop | def GetStatus(self): |
175 | a8083063 | Iustin Pop | """Return the status of the device.
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176 | a8083063 | Iustin Pop |
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177 | a8083063 | Iustin Pop | """
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178 | a8083063 | Iustin Pop | raise NotImplementedError |
179 | a8083063 | Iustin Pop | |
180 | a8083063 | Iustin Pop | |
181 | a8083063 | Iustin Pop | def Open(self, force=False): |
182 | a8083063 | Iustin Pop | """Make the device ready for use.
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183 | a8083063 | Iustin Pop |
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184 | a8083063 | Iustin Pop | This makes the device ready for I/O. For now, just the DRBD
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185 | a8083063 | Iustin Pop | devices need this.
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186 | a8083063 | Iustin Pop |
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187 | a8083063 | Iustin Pop | The force parameter signifies that if the device has any kind of
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188 | a8083063 | Iustin Pop | --force thing, it should be used, we know what we are doing.
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189 | a8083063 | Iustin Pop |
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190 | a8083063 | Iustin Pop | """
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191 | a8083063 | Iustin Pop | raise NotImplementedError |
192 | a8083063 | Iustin Pop | |
193 | a8083063 | Iustin Pop | |
194 | a8083063 | Iustin Pop | def Shutdown(self): |
195 | a8083063 | Iustin Pop | """Shut down the device, freeing its children.
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196 | a8083063 | Iustin Pop |
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197 | a8083063 | Iustin Pop | This undoes the `Assemble()` work, except for the child
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198 | a8083063 | Iustin Pop | assembling; as such, the children on the device are still
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199 | a8083063 | Iustin Pop | assembled after this call.
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200 | a8083063 | Iustin Pop |
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201 | a8083063 | Iustin Pop | """
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202 | a8083063 | Iustin Pop | raise NotImplementedError |
203 | a8083063 | Iustin Pop | |
204 | a8083063 | Iustin Pop | |
205 | a8083063 | Iustin Pop | def SetSyncSpeed(self, speed): |
206 | a8083063 | Iustin Pop | """Adjust the sync speed of the mirror.
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207 | a8083063 | Iustin Pop |
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208 | a8083063 | Iustin Pop | In case this is not a mirroring device, this is no-op.
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209 | a8083063 | Iustin Pop |
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210 | a8083063 | Iustin Pop | """
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211 | a8083063 | Iustin Pop | result = True
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212 | a8083063 | Iustin Pop | if self._children: |
213 | a8083063 | Iustin Pop | for child in self._children: |
214 | a8083063 | Iustin Pop | result = result and child.SetSyncSpeed(speed)
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215 | a8083063 | Iustin Pop | return result
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216 | a8083063 | Iustin Pop | |
217 | a8083063 | Iustin Pop | |
218 | a8083063 | Iustin Pop | def GetSyncStatus(self): |
219 | a8083063 | Iustin Pop | """Returns the sync status of the device.
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220 | a8083063 | Iustin Pop |
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221 | a8083063 | Iustin Pop | If this device is a mirroring device, this function returns the
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222 | a8083063 | Iustin Pop | status of the mirror.
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223 | a8083063 | Iustin Pop |
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224 | a8083063 | Iustin Pop | Returns:
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225 | a8083063 | Iustin Pop | (sync_percent, estimated_time, is_degraded)
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226 | a8083063 | Iustin Pop |
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227 | a8083063 | Iustin Pop | If sync_percent is None, it means all is ok
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228 | a8083063 | Iustin Pop | If estimated_time is None, it means we can't estimate
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229 | a8083063 | Iustin Pop | the time needed, otherwise it's the time left in seconds
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230 | a8083063 | Iustin Pop | If is_degraded is True, it means the device is missing
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231 | a8083063 | Iustin Pop | redundancy. This is usually a sign that something went wrong in
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232 | a8083063 | Iustin Pop | the device setup, if sync_percent is None.
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233 | a8083063 | Iustin Pop |
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234 | a8083063 | Iustin Pop | """
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235 | a8083063 | Iustin Pop | return None, None, False |
236 | a8083063 | Iustin Pop | |
237 | a8083063 | Iustin Pop | |
238 | a8083063 | Iustin Pop | def CombinedSyncStatus(self): |
239 | a8083063 | Iustin Pop | """Calculate the mirror status recursively for our children.
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240 | a8083063 | Iustin Pop |
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241 | a8083063 | Iustin Pop | The return value is the same as for `GetSyncStatus()` except the
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242 | a8083063 | Iustin Pop | minimum percent and maximum time are calculated across our
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243 | a8083063 | Iustin Pop | children.
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244 | a8083063 | Iustin Pop |
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245 | a8083063 | Iustin Pop | """
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246 | a8083063 | Iustin Pop | min_percent, max_time, is_degraded = self.GetSyncStatus()
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247 | a8083063 | Iustin Pop | if self._children: |
248 | a8083063 | Iustin Pop | for child in self._children: |
249 | a8083063 | Iustin Pop | c_percent, c_time, c_degraded = child.GetSyncStatus() |
250 | a8083063 | Iustin Pop | if min_percent is None: |
251 | a8083063 | Iustin Pop | min_percent = c_percent |
252 | a8083063 | Iustin Pop | elif c_percent is not None: |
253 | a8083063 | Iustin Pop | min_percent = min(min_percent, c_percent)
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254 | a8083063 | Iustin Pop | if max_time is None: |
255 | a8083063 | Iustin Pop | max_time = c_time |
256 | a8083063 | Iustin Pop | elif c_time is not None: |
257 | a8083063 | Iustin Pop | max_time = max(max_time, c_time)
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258 | a8083063 | Iustin Pop | is_degraded = is_degraded or c_degraded
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259 | a8083063 | Iustin Pop | return min_percent, max_time, is_degraded
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260 | a8083063 | Iustin Pop | |
261 | a8083063 | Iustin Pop | |
262 | a8083063 | Iustin Pop | def __repr__(self): |
263 | a8083063 | Iustin Pop | return ("<%s: unique_id: %s, children: %s, %s:%s, %s>" % |
264 | a8083063 | Iustin Pop | (self.__class__, self.unique_id, self._children, |
265 | a8083063 | Iustin Pop | self.major, self.minor, self.dev_path)) |
266 | a8083063 | Iustin Pop | |
267 | a8083063 | Iustin Pop | |
268 | a8083063 | Iustin Pop | class LogicalVolume(BlockDev): |
269 | a8083063 | Iustin Pop | """Logical Volume block device.
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270 | a8083063 | Iustin Pop |
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271 | a8083063 | Iustin Pop | """
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272 | a8083063 | Iustin Pop | def __init__(self, unique_id, children): |
273 | a8083063 | Iustin Pop | """Attaches to a LV device.
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274 | a8083063 | Iustin Pop |
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275 | a8083063 | Iustin Pop | The unique_id is a tuple (vg_name, lv_name)
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276 | a8083063 | Iustin Pop |
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277 | a8083063 | Iustin Pop | """
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278 | a8083063 | Iustin Pop | super(LogicalVolume, self).__init__(unique_id, children) |
279 | a8083063 | Iustin Pop | if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
280 | a8083063 | Iustin Pop | raise ValueError("Invalid configuration data %s" % str(unique_id)) |
281 | a8083063 | Iustin Pop | self._vg_name, self._lv_name = unique_id |
282 | a8083063 | Iustin Pop | self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name) |
283 | a8083063 | Iustin Pop | self.Attach()
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284 | a8083063 | Iustin Pop | |
285 | a8083063 | Iustin Pop | |
286 | a8083063 | Iustin Pop | @classmethod
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287 | a8083063 | Iustin Pop | def Create(cls, unique_id, children, size): |
288 | a8083063 | Iustin Pop | """Create a new logical volume.
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289 | a8083063 | Iustin Pop |
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290 | a8083063 | Iustin Pop | """
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291 | a8083063 | Iustin Pop | if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
292 | a8083063 | Iustin Pop | raise ValueError("Invalid configuration data %s" % str(unique_id)) |
293 | a8083063 | Iustin Pop | vg_name, lv_name = unique_id |
294 | a8083063 | Iustin Pop | pvs_info = cls.GetPVInfo(vg_name) |
295 | a8083063 | Iustin Pop | if not pvs_info: |
296 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("Can't compute PV info for vg %s" % |
297 | a8083063 | Iustin Pop | vg_name) |
298 | a8083063 | Iustin Pop | pvs_info.sort() |
299 | a8083063 | Iustin Pop | pvs_info.reverse() |
300 | a8083063 | Iustin Pop | free_size, pv_name = pvs_info[0]
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301 | a8083063 | Iustin Pop | if free_size < size:
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302 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("Not enough free space: required %s," |
303 | a8083063 | Iustin Pop | " available %s" % (size, free_size))
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304 | a8083063 | Iustin Pop | result = utils.RunCmd(["lvcreate", "-L%dm" % size, "-n%s" % lv_name, |
305 | a8083063 | Iustin Pop | vg_name, pv_name]) |
306 | a8083063 | Iustin Pop | if result.failed:
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307 | a8083063 | Iustin Pop | raise errors.BlockDeviceError(result.fail_reason)
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308 | a8083063 | Iustin Pop | return LogicalVolume(unique_id, children)
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309 | a8083063 | Iustin Pop | |
310 | a8083063 | Iustin Pop | @staticmethod
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311 | a8083063 | Iustin Pop | def GetPVInfo(vg_name): |
312 | a8083063 | Iustin Pop | """Get the free space info for PVs in a volume group.
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313 | a8083063 | Iustin Pop |
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314 | a8083063 | Iustin Pop | Args:
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315 | a8083063 | Iustin Pop | vg_name: the volume group name
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316 | a8083063 | Iustin Pop |
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317 | a8083063 | Iustin Pop | Returns:
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318 | a8083063 | Iustin Pop | list of (free_space, name) with free_space in mebibytes
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319 | a8083063 | Iustin Pop | """
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320 | a8083063 | Iustin Pop | command = ["pvs", "--noheadings", "--nosuffix", "--units=m", |
321 | a8083063 | Iustin Pop | "-opv_name,vg_name,pv_free,pv_attr", "--unbuffered", |
322 | a8083063 | Iustin Pop | "--separator=:"]
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323 | a8083063 | Iustin Pop | result = utils.RunCmd(command) |
324 | a8083063 | Iustin Pop | if result.failed:
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325 | a8083063 | Iustin Pop | logger.Error("Can't get the PV information: %s" % result.fail_reason)
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326 | a8083063 | Iustin Pop | return None |
327 | a8083063 | Iustin Pop | data = [] |
328 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
329 | a8083063 | Iustin Pop | fields = line.strip().split(':')
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330 | a8083063 | Iustin Pop | if len(fields) != 4: |
331 | a8083063 | Iustin Pop | logger.Error("Can't parse pvs output: line '%s'" % line)
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332 | a8083063 | Iustin Pop | return None |
333 | a8083063 | Iustin Pop | # skip over pvs from another vg or ones which are not allocatable
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334 | a8083063 | Iustin Pop | if fields[1] != vg_name or fields[3][0] != 'a': |
335 | a8083063 | Iustin Pop | continue
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336 | a8083063 | Iustin Pop | data.append((float(fields[2]), fields[0])) |
337 | a8083063 | Iustin Pop | |
338 | a8083063 | Iustin Pop | return data
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339 | a8083063 | Iustin Pop | |
340 | a8083063 | Iustin Pop | def Remove(self): |
341 | a8083063 | Iustin Pop | """Remove this logical volume.
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342 | a8083063 | Iustin Pop |
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343 | a8083063 | Iustin Pop | """
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344 | a8083063 | Iustin Pop | if not self.minor and not self.Attach(): |
345 | a8083063 | Iustin Pop | # the LV does not exist
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346 | a8083063 | Iustin Pop | return True |
347 | a8083063 | Iustin Pop | result = utils.RunCmd(["lvremove", "-f", "%s/%s" % |
348 | a8083063 | Iustin Pop | (self._vg_name, self._lv_name)]) |
349 | a8083063 | Iustin Pop | if result.failed:
|
350 | a8083063 | Iustin Pop | logger.Error("Can't lvremove: %s" % result.fail_reason)
|
351 | a8083063 | Iustin Pop | |
352 | a8083063 | Iustin Pop | return not result.failed |
353 | a8083063 | Iustin Pop | |
354 | a8083063 | Iustin Pop | |
355 | a8083063 | Iustin Pop | def Attach(self): |
356 | a8083063 | Iustin Pop | """Attach to an existing LV.
|
357 | a8083063 | Iustin Pop |
|
358 | a8083063 | Iustin Pop | This method will try to see if an existing and active LV exists
|
359 | a8083063 | Iustin Pop | which matches the our name. If so, its major/minor will be
|
360 | a8083063 | Iustin Pop | recorded.
|
361 | a8083063 | Iustin Pop |
|
362 | a8083063 | Iustin Pop | """
|
363 | a8083063 | Iustin Pop | result = utils.RunCmd(["lvdisplay", self.dev_path]) |
364 | a8083063 | Iustin Pop | if result.failed:
|
365 | a8083063 | Iustin Pop | logger.Error("Can't find LV %s: %s" %
|
366 | a8083063 | Iustin Pop | (self.dev_path, result.fail_reason))
|
367 | a8083063 | Iustin Pop | return False |
368 | a8083063 | Iustin Pop | match = re.compile("^ *Block device *([0-9]+):([0-9]+).*$")
|
369 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
370 | a8083063 | Iustin Pop | match_result = match.match(line) |
371 | a8083063 | Iustin Pop | if match_result:
|
372 | a8083063 | Iustin Pop | self.major = int(match_result.group(1)) |
373 | a8083063 | Iustin Pop | self.minor = int(match_result.group(2)) |
374 | a8083063 | Iustin Pop | return True |
375 | a8083063 | Iustin Pop | return False |
376 | a8083063 | Iustin Pop | |
377 | a8083063 | Iustin Pop | |
378 | a8083063 | Iustin Pop | def Assemble(self): |
379 | a8083063 | Iustin Pop | """Assemble the device.
|
380 | a8083063 | Iustin Pop |
|
381 | a8083063 | Iustin Pop | This is a no-op for the LV device type. Eventually, we could
|
382 | a8083063 | Iustin Pop | lvchange -ay here if we see that the LV is not active.
|
383 | a8083063 | Iustin Pop |
|
384 | a8083063 | Iustin Pop | """
|
385 | a8083063 | Iustin Pop | return True |
386 | a8083063 | Iustin Pop | |
387 | a8083063 | Iustin Pop | |
388 | a8083063 | Iustin Pop | def Shutdown(self): |
389 | a8083063 | Iustin Pop | """Shutdown the device.
|
390 | a8083063 | Iustin Pop |
|
391 | a8083063 | Iustin Pop | This is a no-op for the LV device type, as we don't deactivate the
|
392 | a8083063 | Iustin Pop | volumes on shutdown.
|
393 | a8083063 | Iustin Pop |
|
394 | a8083063 | Iustin Pop | """
|
395 | a8083063 | Iustin Pop | return True |
396 | a8083063 | Iustin Pop | |
397 | a8083063 | Iustin Pop | |
398 | a8083063 | Iustin Pop | def GetStatus(self): |
399 | a8083063 | Iustin Pop | """Return the status of the device.
|
400 | a8083063 | Iustin Pop |
|
401 | a8083063 | Iustin Pop | Logical volumes will can be in all four states, although we don't
|
402 | a8083063 | Iustin Pop | deactivate (lvchange -an) them when shutdown, so STATUS_EXISTING
|
403 | a8083063 | Iustin Pop | should not be seen for our devices.
|
404 | a8083063 | Iustin Pop |
|
405 | a8083063 | Iustin Pop | """
|
406 | a8083063 | Iustin Pop | result = utils.RunCmd(["lvs", "--noheadings", "-olv_attr", self.dev_path]) |
407 | a8083063 | Iustin Pop | if result.failed:
|
408 | a8083063 | Iustin Pop | logger.Error("Can't display lv: %s" % result.fail_reason)
|
409 | a8083063 | Iustin Pop | return self.STATUS_UNKNOWN |
410 | a8083063 | Iustin Pop | out = result.stdout.strip() |
411 | a8083063 | Iustin Pop | # format: type/permissions/alloc/fixed_minor/state/open
|
412 | a8083063 | Iustin Pop | if len(out) != 6: |
413 | a8083063 | Iustin Pop | return self.STATUS_UNKNOWN |
414 | a8083063 | Iustin Pop | #writable = (out[1] == "w")
|
415 | a8083063 | Iustin Pop | active = (out[4] == "a") |
416 | a8083063 | Iustin Pop | online = (out[5] == "o") |
417 | a8083063 | Iustin Pop | if online:
|
418 | a8083063 | Iustin Pop | retval = self.STATUS_ONLINE
|
419 | a8083063 | Iustin Pop | elif active:
|
420 | a8083063 | Iustin Pop | retval = self.STATUS_STANDBY
|
421 | a8083063 | Iustin Pop | else:
|
422 | a8083063 | Iustin Pop | retval = self.STATUS_EXISTING
|
423 | a8083063 | Iustin Pop | |
424 | a8083063 | Iustin Pop | return retval
|
425 | a8083063 | Iustin Pop | |
426 | a8083063 | Iustin Pop | |
427 | a8083063 | Iustin Pop | def Open(self, force=False): |
428 | a8083063 | Iustin Pop | """Make the device ready for I/O.
|
429 | a8083063 | Iustin Pop |
|
430 | a8083063 | Iustin Pop | This is a no-op for the LV device type.
|
431 | a8083063 | Iustin Pop |
|
432 | a8083063 | Iustin Pop | """
|
433 | a8083063 | Iustin Pop | return True |
434 | a8083063 | Iustin Pop | |
435 | a8083063 | Iustin Pop | |
436 | a8083063 | Iustin Pop | def Close(self): |
437 | a8083063 | Iustin Pop | """Notifies that the device will no longer be used for I/O.
|
438 | a8083063 | Iustin Pop |
|
439 | a8083063 | Iustin Pop | This is a no-op for the LV device type.
|
440 | a8083063 | Iustin Pop |
|
441 | a8083063 | Iustin Pop | """
|
442 | a8083063 | Iustin Pop | return True |
443 | a8083063 | Iustin Pop | |
444 | a8083063 | Iustin Pop | |
445 | a8083063 | Iustin Pop | def Snapshot(self, size): |
446 | a8083063 | Iustin Pop | """Create a snapshot copy of an lvm block device.
|
447 | a8083063 | Iustin Pop |
|
448 | a8083063 | Iustin Pop | """
|
449 | a8083063 | Iustin Pop | |
450 | a8083063 | Iustin Pop | snap_name = self._lv_name + ".snap" |
451 | a8083063 | Iustin Pop | |
452 | a8083063 | Iustin Pop | # remove existing snapshot if found
|
453 | a8083063 | Iustin Pop | snap = LogicalVolume((self._vg_name, snap_name), None) |
454 | a8083063 | Iustin Pop | snap.Remove() |
455 | a8083063 | Iustin Pop | |
456 | a8083063 | Iustin Pop | pvs_info = self.GetPVInfo(self._vg_name) |
457 | a8083063 | Iustin Pop | if not pvs_info: |
458 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("Can't compute PV info for vg %s" % |
459 | a8083063 | Iustin Pop | self._vg_name)
|
460 | a8083063 | Iustin Pop | pvs_info.sort() |
461 | a8083063 | Iustin Pop | pvs_info.reverse() |
462 | a8083063 | Iustin Pop | free_size, pv_name = pvs_info[0]
|
463 | a8083063 | Iustin Pop | if free_size < size:
|
464 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("Not enough free space: required %s," |
465 | a8083063 | Iustin Pop | " available %s" % (size, free_size))
|
466 | a8083063 | Iustin Pop | |
467 | a8083063 | Iustin Pop | result = utils.RunCmd(["lvcreate", "-L%dm" % size, "-s", |
468 | a8083063 | Iustin Pop | "-n%s" % snap_name, self.dev_path]) |
469 | a8083063 | Iustin Pop | if result.failed:
|
470 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("command: %s error: %s" % |
471 | a8083063 | Iustin Pop | (result.cmd, result.fail_reason)) |
472 | a8083063 | Iustin Pop | |
473 | a8083063 | Iustin Pop | return snap_name
|
474 | a8083063 | Iustin Pop | |
475 | a8083063 | Iustin Pop | |
476 | a8083063 | Iustin Pop | class MDRaid1(BlockDev): |
477 | a8083063 | Iustin Pop | """raid1 device implemented via md.
|
478 | a8083063 | Iustin Pop |
|
479 | a8083063 | Iustin Pop | """
|
480 | a8083063 | Iustin Pop | def __init__(self, unique_id, children): |
481 | a8083063 | Iustin Pop | super(MDRaid1, self).__init__(unique_id, children) |
482 | a8083063 | Iustin Pop | self.major = 9 |
483 | a8083063 | Iustin Pop | self.Attach()
|
484 | a8083063 | Iustin Pop | |
485 | a8083063 | Iustin Pop | |
486 | a8083063 | Iustin Pop | def Attach(self): |
487 | a8083063 | Iustin Pop | """Find an array which matches our config and attach to it.
|
488 | a8083063 | Iustin Pop |
|
489 | a8083063 | Iustin Pop | This tries to find a MD array which has the same UUID as our own.
|
490 | a8083063 | Iustin Pop |
|
491 | a8083063 | Iustin Pop | """
|
492 | a8083063 | Iustin Pop | minor = self._FindMDByUUID(self.unique_id) |
493 | a8083063 | Iustin Pop | if minor is not None: |
494 | a8083063 | Iustin Pop | self._SetFromMinor(minor)
|
495 | a8083063 | Iustin Pop | else:
|
496 | a8083063 | Iustin Pop | self.minor = None |
497 | a8083063 | Iustin Pop | self.dev_path = None |
498 | a8083063 | Iustin Pop | |
499 | a8083063 | Iustin Pop | return (minor is not None) |
500 | a8083063 | Iustin Pop | |
501 | a8083063 | Iustin Pop | |
502 | a8083063 | Iustin Pop | @staticmethod
|
503 | a8083063 | Iustin Pop | def _GetUsedDevs(): |
504 | a8083063 | Iustin Pop | """Compute the list of in-use MD devices.
|
505 | a8083063 | Iustin Pop |
|
506 | a8083063 | Iustin Pop | It doesn't matter if the used device have other raid level, just
|
507 | a8083063 | Iustin Pop | that they are in use.
|
508 | a8083063 | Iustin Pop |
|
509 | a8083063 | Iustin Pop | """
|
510 | a8083063 | Iustin Pop | mdstat = open("/proc/mdstat", "r") |
511 | a8083063 | Iustin Pop | data = mdstat.readlines() |
512 | a8083063 | Iustin Pop | mdstat.close() |
513 | a8083063 | Iustin Pop | |
514 | a8083063 | Iustin Pop | used_md = {} |
515 | a8083063 | Iustin Pop | valid_line = re.compile("^md([0-9]+) : .*$")
|
516 | a8083063 | Iustin Pop | for line in data: |
517 | a8083063 | Iustin Pop | match = valid_line.match(line) |
518 | a8083063 | Iustin Pop | if match:
|
519 | a8083063 | Iustin Pop | md_no = int(match.group(1)) |
520 | a8083063 | Iustin Pop | used_md[md_no] = line |
521 | a8083063 | Iustin Pop | |
522 | a8083063 | Iustin Pop | return used_md
|
523 | a8083063 | Iustin Pop | |
524 | a8083063 | Iustin Pop | |
525 | a8083063 | Iustin Pop | @staticmethod
|
526 | a8083063 | Iustin Pop | def _GetDevInfo(minor): |
527 | a8083063 | Iustin Pop | """Get info about a MD device.
|
528 | a8083063 | Iustin Pop |
|
529 | a8083063 | Iustin Pop | Currently only uuid is returned.
|
530 | a8083063 | Iustin Pop |
|
531 | a8083063 | Iustin Pop | """
|
532 | a8083063 | Iustin Pop | result = utils.RunCmd(["mdadm", "-D", "/dev/md%d" % minor]) |
533 | a8083063 | Iustin Pop | if result.failed:
|
534 | a8083063 | Iustin Pop | logger.Error("Can't display md: %s" % result.fail_reason)
|
535 | a8083063 | Iustin Pop | return None |
536 | a8083063 | Iustin Pop | retval = {} |
537 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
538 | a8083063 | Iustin Pop | line = line.strip() |
539 | a8083063 | Iustin Pop | kv = line.split(" : ", 1) |
540 | a8083063 | Iustin Pop | if kv:
|
541 | a8083063 | Iustin Pop | if kv[0] == "UUID": |
542 | a8083063 | Iustin Pop | retval["uuid"] = kv[1] |
543 | a8083063 | Iustin Pop | elif kv[0] == "State": |
544 | a8083063 | Iustin Pop | retval["state"] = kv[1].split(", ") |
545 | a8083063 | Iustin Pop | return retval
|
546 | a8083063 | Iustin Pop | |
547 | a8083063 | Iustin Pop | |
548 | a8083063 | Iustin Pop | @staticmethod
|
549 | a8083063 | Iustin Pop | def _FindUnusedMinor(): |
550 | a8083063 | Iustin Pop | """Compute an unused MD minor.
|
551 | a8083063 | Iustin Pop |
|
552 | a8083063 | Iustin Pop | This code assumes that there are 256 minors only.
|
553 | a8083063 | Iustin Pop |
|
554 | a8083063 | Iustin Pop | """
|
555 | a8083063 | Iustin Pop | used_md = MDRaid1._GetUsedDevs() |
556 | a8083063 | Iustin Pop | i = 0
|
557 | a8083063 | Iustin Pop | while i < 256: |
558 | a8083063 | Iustin Pop | if i not in used_md: |
559 | a8083063 | Iustin Pop | break
|
560 | a8083063 | Iustin Pop | i += 1
|
561 | a8083063 | Iustin Pop | if i == 256: |
562 | a8083063 | Iustin Pop | logger.Error("Critical: Out of md minor numbers.")
|
563 | a8083063 | Iustin Pop | return None |
564 | a8083063 | Iustin Pop | return i
|
565 | a8083063 | Iustin Pop | |
566 | a8083063 | Iustin Pop | |
567 | a8083063 | Iustin Pop | @classmethod
|
568 | a8083063 | Iustin Pop | def _FindMDByUUID(cls, uuid): |
569 | a8083063 | Iustin Pop | """Find the minor of an MD array with a given UUID.
|
570 | a8083063 | Iustin Pop |
|
571 | a8083063 | Iustin Pop | """
|
572 | a8083063 | Iustin Pop | md_list = cls._GetUsedDevs() |
573 | a8083063 | Iustin Pop | for minor in md_list: |
574 | a8083063 | Iustin Pop | info = cls._GetDevInfo(minor) |
575 | a8083063 | Iustin Pop | if info and info["uuid"] == uuid: |
576 | a8083063 | Iustin Pop | return minor
|
577 | a8083063 | Iustin Pop | return None |
578 | a8083063 | Iustin Pop | |
579 | a8083063 | Iustin Pop | |
580 | a8083063 | Iustin Pop | @classmethod
|
581 | a8083063 | Iustin Pop | def Create(cls, unique_id, children, size): |
582 | a8083063 | Iustin Pop | """Create a new MD raid1 array.
|
583 | a8083063 | Iustin Pop |
|
584 | a8083063 | Iustin Pop | """
|
585 | a8083063 | Iustin Pop | if not isinstance(children, (tuple, list)): |
586 | a8083063 | Iustin Pop | raise ValueError("Invalid setup data for MDRaid1 dev: %s" % |
587 | a8083063 | Iustin Pop | str(children))
|
588 | a8083063 | Iustin Pop | for i in children: |
589 | a8083063 | Iustin Pop | if not isinstance(i, BlockDev): |
590 | a8083063 | Iustin Pop | raise ValueError("Invalid member in MDRaid1 dev: %s" % type(i)) |
591 | a8083063 | Iustin Pop | for i in children: |
592 | a8083063 | Iustin Pop | result = utils.RunCmd(["mdadm", "--zero-superblock", "--force", |
593 | a8083063 | Iustin Pop | i.dev_path]) |
594 | a8083063 | Iustin Pop | if result.failed:
|
595 | a8083063 | Iustin Pop | logger.Error("Can't zero superblock: %s" % result.fail_reason)
|
596 | a8083063 | Iustin Pop | return None |
597 | a8083063 | Iustin Pop | minor = cls._FindUnusedMinor() |
598 | a8083063 | Iustin Pop | result = utils.RunCmd(["mdadm", "--create", "/dev/md%d" % minor, |
599 | a8083063 | Iustin Pop | "--auto=yes", "--force", "-l1", |
600 | a8083063 | Iustin Pop | "-n%d" % len(children)] + |
601 | a8083063 | Iustin Pop | [dev.dev_path for dev in children]) |
602 | a8083063 | Iustin Pop | |
603 | a8083063 | Iustin Pop | if result.failed:
|
604 | a8083063 | Iustin Pop | logger.Error("Can't create md: %s" % result.fail_reason)
|
605 | a8083063 | Iustin Pop | return None |
606 | a8083063 | Iustin Pop | info = cls._GetDevInfo(minor) |
607 | a8083063 | Iustin Pop | if not info or not "uuid" in info: |
608 | a8083063 | Iustin Pop | logger.Error("Wrong information returned from mdadm -D: %s" % str(info)) |
609 | a8083063 | Iustin Pop | return None |
610 | a8083063 | Iustin Pop | return MDRaid1(info["uuid"], children) |
611 | a8083063 | Iustin Pop | |
612 | a8083063 | Iustin Pop | |
613 | a8083063 | Iustin Pop | def Remove(self): |
614 | a8083063 | Iustin Pop | """Stub remove function for MD RAID 1 arrays.
|
615 | a8083063 | Iustin Pop |
|
616 | a8083063 | Iustin Pop | We don't remove the superblock right now. Mark a to do.
|
617 | a8083063 | Iustin Pop |
|
618 | a8083063 | Iustin Pop | """
|
619 | a8083063 | Iustin Pop | #TODO: maybe zero superblock on child devices?
|
620 | a8083063 | Iustin Pop | return self.Shutdown() |
621 | a8083063 | Iustin Pop | |
622 | a8083063 | Iustin Pop | |
623 | a8083063 | Iustin Pop | def AddChild(self, device): |
624 | a8083063 | Iustin Pop | """Add a new member to the md raid1.
|
625 | a8083063 | Iustin Pop |
|
626 | a8083063 | Iustin Pop | """
|
627 | a8083063 | Iustin Pop | if self.minor is None and not self.Attach(): |
628 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, "Can't attach to device" |
629 | a8083063 | Iustin Pop | if device.dev_path is None: |
630 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, "New child is not initialised" |
631 | a8083063 | Iustin Pop | result = utils.RunCmd(["mdadm", "-a", self.dev_path, device.dev_path]) |
632 | a8083063 | Iustin Pop | if result.failed:
|
633 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("Failed to add new device to array: %s" % |
634 | a8083063 | Iustin Pop | result.output) |
635 | a8083063 | Iustin Pop | new_len = len(self._children) + 1 |
636 | a8083063 | Iustin Pop | result = utils.RunCmd(["mdadm", "--grow", self.dev_path, "-n", new_len]) |
637 | a8083063 | Iustin Pop | if result.failed:
|
638 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("Can't grow md array: %s" % |
639 | a8083063 | Iustin Pop | result.output) |
640 | a8083063 | Iustin Pop | self._children.append(device)
|
641 | a8083063 | Iustin Pop | |
642 | a8083063 | Iustin Pop | |
643 | a8083063 | Iustin Pop | def RemoveChild(self, dev_path): |
644 | a8083063 | Iustin Pop | """Remove member from the md raid1.
|
645 | a8083063 | Iustin Pop |
|
646 | a8083063 | Iustin Pop | """
|
647 | a8083063 | Iustin Pop | if self.minor is None and not self.Attach(): |
648 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, "Can't attach to device" |
649 | a8083063 | Iustin Pop | if len(self._children) == 1: |
650 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("Can't reduce member when only one" |
651 | a8083063 | Iustin Pop | " child left")
|
652 | a8083063 | Iustin Pop | for device in self._children: |
653 | a8083063 | Iustin Pop | if device.dev_path == dev_path:
|
654 | a8083063 | Iustin Pop | break
|
655 | a8083063 | Iustin Pop | else:
|
656 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, "Can't find child with this path" |
657 | a8083063 | Iustin Pop | new_len = len(self._children) - 1 |
658 | a8083063 | Iustin Pop | result = utils.RunCmd(["mdadm", "-f", self.dev_path, dev_path]) |
659 | a8083063 | Iustin Pop | if result.failed:
|
660 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("Failed to mark device as failed: %s" % |
661 | a8083063 | Iustin Pop | result.output) |
662 | a8083063 | Iustin Pop | |
663 | a8083063 | Iustin Pop | # it seems here we need a short delay for MD to update its
|
664 | a8083063 | Iustin Pop | # superblocks
|
665 | a8083063 | Iustin Pop | time.sleep(0.5)
|
666 | a8083063 | Iustin Pop | result = utils.RunCmd(["mdadm", "-r", self.dev_path, dev_path]) |
667 | a8083063 | Iustin Pop | if result.failed:
|
668 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("Failed to remove device from array:" |
669 | a8083063 | Iustin Pop | " %s" % result.output)
|
670 | a8083063 | Iustin Pop | result = utils.RunCmd(["mdadm", "--grow", "--force", self.dev_path, |
671 | a8083063 | Iustin Pop | "-n", new_len])
|
672 | a8083063 | Iustin Pop | if result.failed:
|
673 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, ("Can't shrink md array: %s" % |
674 | a8083063 | Iustin Pop | result.output) |
675 | a8083063 | Iustin Pop | self._children.remove(device)
|
676 | a8083063 | Iustin Pop | |
677 | a8083063 | Iustin Pop | |
678 | a8083063 | Iustin Pop | def GetStatus(self): |
679 | a8083063 | Iustin Pop | """Return the status of the device.
|
680 | a8083063 | Iustin Pop |
|
681 | a8083063 | Iustin Pop | """
|
682 | a8083063 | Iustin Pop | self.Attach()
|
683 | a8083063 | Iustin Pop | if self.minor is None: |
684 | a8083063 | Iustin Pop | retval = self.STATUS_UNKNOWN
|
685 | a8083063 | Iustin Pop | else:
|
686 | a8083063 | Iustin Pop | retval = self.STATUS_ONLINE
|
687 | a8083063 | Iustin Pop | return retval
|
688 | a8083063 | Iustin Pop | |
689 | a8083063 | Iustin Pop | |
690 | a8083063 | Iustin Pop | def _SetFromMinor(self, minor): |
691 | a8083063 | Iustin Pop | """Set our parameters based on the given minor.
|
692 | a8083063 | Iustin Pop |
|
693 | a8083063 | Iustin Pop | This sets our minor variable and our dev_path.
|
694 | a8083063 | Iustin Pop |
|
695 | a8083063 | Iustin Pop | """
|
696 | a8083063 | Iustin Pop | self.minor = minor
|
697 | a8083063 | Iustin Pop | self.dev_path = "/dev/md%d" % minor |
698 | a8083063 | Iustin Pop | |
699 | a8083063 | Iustin Pop | |
700 | a8083063 | Iustin Pop | def Assemble(self): |
701 | a8083063 | Iustin Pop | """Assemble the MD device.
|
702 | a8083063 | Iustin Pop |
|
703 | a8083063 | Iustin Pop | At this point we should have:
|
704 | a8083063 | Iustin Pop | - list of children devices
|
705 | a8083063 | Iustin Pop | - uuid
|
706 | a8083063 | Iustin Pop |
|
707 | a8083063 | Iustin Pop | """
|
708 | a8083063 | Iustin Pop | result = super(MDRaid1, self).Assemble() |
709 | a8083063 | Iustin Pop | if not result: |
710 | a8083063 | Iustin Pop | return result
|
711 | a8083063 | Iustin Pop | md_list = self._GetUsedDevs()
|
712 | a8083063 | Iustin Pop | for minor in md_list: |
713 | a8083063 | Iustin Pop | info = self._GetDevInfo(minor)
|
714 | a8083063 | Iustin Pop | if info and info["uuid"] == self.unique_id: |
715 | a8083063 | Iustin Pop | self._SetFromMinor(minor)
|
716 | a8083063 | Iustin Pop | logger.Info("MD array %s already started" % str(self)) |
717 | a8083063 | Iustin Pop | return True |
718 | a8083063 | Iustin Pop | free_minor = self._FindUnusedMinor()
|
719 | a8083063 | Iustin Pop | result = utils.RunCmd(["mdadm", "-A", "--auto=yes", "--uuid", |
720 | a8083063 | Iustin Pop | self.unique_id, "/dev/md%d" % free_minor] + |
721 | a8083063 | Iustin Pop | [bdev.dev_path for bdev in self._children]) |
722 | a8083063 | Iustin Pop | if result.failed:
|
723 | a8083063 | Iustin Pop | logger.Error("Can't assemble MD array: %s" % result.fail_reason)
|
724 | a8083063 | Iustin Pop | self.minor = None |
725 | a8083063 | Iustin Pop | else:
|
726 | a8083063 | Iustin Pop | self.minor = free_minor
|
727 | a8083063 | Iustin Pop | return not result.failed |
728 | a8083063 | Iustin Pop | |
729 | a8083063 | Iustin Pop | |
730 | a8083063 | Iustin Pop | def Shutdown(self): |
731 | a8083063 | Iustin Pop | """Tear down the MD array.
|
732 | a8083063 | Iustin Pop |
|
733 | a8083063 | Iustin Pop | This does a 'mdadm --stop' so after this command, the array is no
|
734 | a8083063 | Iustin Pop | longer available.
|
735 | a8083063 | Iustin Pop |
|
736 | a8083063 | Iustin Pop | """
|
737 | a8083063 | Iustin Pop | if self.minor is None and not self.Attach(): |
738 | a8083063 | Iustin Pop | logger.Info("MD object not attached to a device")
|
739 | a8083063 | Iustin Pop | return True |
740 | a8083063 | Iustin Pop | |
741 | a8083063 | Iustin Pop | result = utils.RunCmd(["mdadm", "--stop", "/dev/md%d" % self.minor]) |
742 | a8083063 | Iustin Pop | if result.failed:
|
743 | a8083063 | Iustin Pop | logger.Error("Can't stop MD array: %s" % result.fail_reason)
|
744 | a8083063 | Iustin Pop | return False |
745 | a8083063 | Iustin Pop | self.minor = None |
746 | a8083063 | Iustin Pop | self.dev_path = None |
747 | a8083063 | Iustin Pop | return True |
748 | a8083063 | Iustin Pop | |
749 | a8083063 | Iustin Pop | |
750 | a8083063 | Iustin Pop | def SetSyncSpeed(self, kbytes): |
751 | a8083063 | Iustin Pop | """Set the maximum sync speed for the MD array.
|
752 | a8083063 | Iustin Pop |
|
753 | a8083063 | Iustin Pop | """
|
754 | a8083063 | Iustin Pop | result = super(MDRaid1, self).SetSyncSpeed(kbytes) |
755 | a8083063 | Iustin Pop | if self.minor is None: |
756 | a8083063 | Iustin Pop | logger.Error("MD array not attached to a device")
|
757 | a8083063 | Iustin Pop | return False |
758 | a8083063 | Iustin Pop | f = open("/sys/block/md%d/md/sync_speed_max" % self.minor, "w") |
759 | a8083063 | Iustin Pop | try:
|
760 | a8083063 | Iustin Pop | f.write("%d" % kbytes)
|
761 | a8083063 | Iustin Pop | finally:
|
762 | a8083063 | Iustin Pop | f.close() |
763 | a8083063 | Iustin Pop | f = open("/sys/block/md%d/md/sync_speed_min" % self.minor, "w") |
764 | a8083063 | Iustin Pop | try:
|
765 | a8083063 | Iustin Pop | f.write("%d" % (kbytes/2)) |
766 | a8083063 | Iustin Pop | finally:
|
767 | a8083063 | Iustin Pop | f.close() |
768 | a8083063 | Iustin Pop | return result
|
769 | a8083063 | Iustin Pop | |
770 | a8083063 | Iustin Pop | |
771 | a8083063 | Iustin Pop | def GetSyncStatus(self): |
772 | a8083063 | Iustin Pop | """Returns the sync status of the device.
|
773 | a8083063 | Iustin Pop |
|
774 | a8083063 | Iustin Pop | Returns:
|
775 | a8083063 | Iustin Pop | (sync_percent, estimated_time)
|
776 | a8083063 | Iustin Pop |
|
777 | a8083063 | Iustin Pop | If sync_percent is None, it means all is ok
|
778 | a8083063 | Iustin Pop | If estimated_time is None, it means we can't esimate
|
779 | a8083063 | Iustin Pop | the time needed, otherwise it's the time left in seconds
|
780 | a8083063 | Iustin Pop |
|
781 | a8083063 | Iustin Pop | """
|
782 | a8083063 | Iustin Pop | if self.minor is None and not self.Attach(): |
783 | a8083063 | Iustin Pop | raise errors.BlockDeviceError("Can't attach to device in GetSyncStatus") |
784 | a8083063 | Iustin Pop | dev_info = self._GetDevInfo(self.minor) |
785 | a8083063 | Iustin Pop | is_clean = ("state" in dev_info and |
786 | a8083063 | Iustin Pop | len(dev_info["state"]) == 1 and |
787 | a8083063 | Iustin Pop | dev_info["state"][0] in ("clean", "active")) |
788 | a8083063 | Iustin Pop | sys_path = "/sys/block/md%s/md/" % self.minor |
789 | a8083063 | Iustin Pop | f = file(sys_path + "sync_action") |
790 | a8083063 | Iustin Pop | sync_status = f.readline().strip() |
791 | a8083063 | Iustin Pop | f.close() |
792 | a8083063 | Iustin Pop | if sync_status == "idle": |
793 | a8083063 | Iustin Pop | return None, None, not is_clean |
794 | a8083063 | Iustin Pop | f = file(sys_path + "sync_completed") |
795 | a8083063 | Iustin Pop | sync_completed = f.readline().strip().split(" / ")
|
796 | a8083063 | Iustin Pop | f.close() |
797 | a8083063 | Iustin Pop | if len(sync_completed) != 2: |
798 | a8083063 | Iustin Pop | return 0, None, not is_clean |
799 | a8083063 | Iustin Pop | sync_done, sync_total = [float(i) for i in sync_completed] |
800 | a8083063 | Iustin Pop | sync_percent = 100.0*sync_done/sync_total
|
801 | a8083063 | Iustin Pop | f = file(sys_path + "sync_speed") |
802 | a8083063 | Iustin Pop | sync_speed_k = int(f.readline().strip())
|
803 | a8083063 | Iustin Pop | if sync_speed_k == 0: |
804 | a8083063 | Iustin Pop | time_est = None
|
805 | a8083063 | Iustin Pop | else:
|
806 | a8083063 | Iustin Pop | time_est = (sync_total - sync_done) / 2 / sync_speed_k
|
807 | a8083063 | Iustin Pop | return sync_percent, time_est, not is_clean |
808 | a8083063 | Iustin Pop | |
809 | a8083063 | Iustin Pop | |
810 | a8083063 | Iustin Pop | def Open(self, force=False): |
811 | a8083063 | Iustin Pop | """Make the device ready for I/O.
|
812 | a8083063 | Iustin Pop |
|
813 | a8083063 | Iustin Pop | This is a no-op for the MDRaid1 device type, although we could use
|
814 | a8083063 | Iustin Pop | the 2.6.18's new array_state thing.
|
815 | a8083063 | Iustin Pop |
|
816 | a8083063 | Iustin Pop | """
|
817 | a8083063 | Iustin Pop | return True |
818 | a8083063 | Iustin Pop | |
819 | a8083063 | Iustin Pop | |
820 | a8083063 | Iustin Pop | def Close(self): |
821 | a8083063 | Iustin Pop | """Notifies that the device will no longer be used for I/O.
|
822 | a8083063 | Iustin Pop |
|
823 | a8083063 | Iustin Pop | This is a no-op for the MDRaid1 device type, but see comment for
|
824 | a8083063 | Iustin Pop | `Open()`.
|
825 | a8083063 | Iustin Pop |
|
826 | a8083063 | Iustin Pop | """
|
827 | a8083063 | Iustin Pop | return True |
828 | a8083063 | Iustin Pop | |
829 | a8083063 | Iustin Pop | |
830 | a8083063 | Iustin Pop | |
831 | a8083063 | Iustin Pop | class DRBDev(BlockDev): |
832 | a8083063 | Iustin Pop | """DRBD block device.
|
833 | a8083063 | Iustin Pop |
|
834 | a8083063 | Iustin Pop | This implements the local host part of the DRBD device, i.e. it
|
835 | a8083063 | Iustin Pop | doesn't do anything to the supposed peer. If you need a fully
|
836 | a8083063 | Iustin Pop | connected DRBD pair, you need to use this class on both hosts.
|
837 | a8083063 | Iustin Pop |
|
838 | a8083063 | Iustin Pop | The unique_id for the drbd device is the (local_ip, local_port,
|
839 | a8083063 | Iustin Pop | remote_ip, remote_port) tuple, and it must have two children: the
|
840 | a8083063 | Iustin Pop | data device and the meta_device. The meta device is checked for
|
841 | a8083063 | Iustin Pop | valid size and is zeroed on create.
|
842 | a8083063 | Iustin Pop |
|
843 | a8083063 | Iustin Pop | """
|
844 | a8083063 | Iustin Pop | _DRBD_MAJOR = 147
|
845 | a8083063 | Iustin Pop | _ST_UNCONFIGURED = "Unconfigured"
|
846 | a8083063 | Iustin Pop | _ST_WFCONNECTION = "WFConnection"
|
847 | a8083063 | Iustin Pop | _ST_CONNECTED = "Connected"
|
848 | a8083063 | Iustin Pop | |
849 | a8083063 | Iustin Pop | def __init__(self, unique_id, children): |
850 | a8083063 | Iustin Pop | super(DRBDev, self).__init__(unique_id, children) |
851 | a8083063 | Iustin Pop | self.major = self._DRBD_MAJOR |
852 | a8083063 | Iustin Pop | if len(children) != 2: |
853 | a8083063 | Iustin Pop | raise ValueError("Invalid configuration data %s" % str(children)) |
854 | a8083063 | Iustin Pop | if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 4: |
855 | a8083063 | Iustin Pop | raise ValueError("Invalid configuration data %s" % str(unique_id)) |
856 | a8083063 | Iustin Pop | self._lhost, self._lport, self._rhost, self._rport = unique_id |
857 | a8083063 | Iustin Pop | self.Attach()
|
858 | a8083063 | Iustin Pop | |
859 | a8083063 | Iustin Pop | @staticmethod
|
860 | a8083063 | Iustin Pop | def _DevPath(minor): |
861 | a8083063 | Iustin Pop | """Return the path to a drbd device for a given minor.
|
862 | a8083063 | Iustin Pop |
|
863 | a8083063 | Iustin Pop | """
|
864 | a8083063 | Iustin Pop | return "/dev/drbd%d" % minor |
865 | a8083063 | Iustin Pop | |
866 | a8083063 | Iustin Pop | @staticmethod
|
867 | a8083063 | Iustin Pop | def _GetProcData(): |
868 | a8083063 | Iustin Pop | """Return data from /proc/drbd.
|
869 | a8083063 | Iustin Pop |
|
870 | a8083063 | Iustin Pop | """
|
871 | a8083063 | Iustin Pop | stat = open("/proc/drbd", "r") |
872 | a8083063 | Iustin Pop | data = stat.read().splitlines() |
873 | a8083063 | Iustin Pop | stat.close() |
874 | a8083063 | Iustin Pop | return data
|
875 | a8083063 | Iustin Pop | |
876 | a8083063 | Iustin Pop | |
877 | a8083063 | Iustin Pop | @classmethod
|
878 | a8083063 | Iustin Pop | def _GetUsedDevs(cls): |
879 | a8083063 | Iustin Pop | """Compute the list of used DRBD devices.
|
880 | a8083063 | Iustin Pop |
|
881 | a8083063 | Iustin Pop | """
|
882 | a8083063 | Iustin Pop | data = cls._GetProcData() |
883 | a8083063 | Iustin Pop | |
884 | a8083063 | Iustin Pop | used_devs = {} |
885 | a8083063 | Iustin Pop | valid_line = re.compile("^ *([0-9]+): cs:([^ ]+).*$")
|
886 | a8083063 | Iustin Pop | for line in data: |
887 | a8083063 | Iustin Pop | match = valid_line.match(line) |
888 | a8083063 | Iustin Pop | if not match: |
889 | a8083063 | Iustin Pop | continue
|
890 | a8083063 | Iustin Pop | minor = int(match.group(1)) |
891 | a8083063 | Iustin Pop | state = match.group(2)
|
892 | a8083063 | Iustin Pop | if state == cls._ST_UNCONFIGURED:
|
893 | a8083063 | Iustin Pop | continue
|
894 | a8083063 | Iustin Pop | used_devs[minor] = state, line |
895 | a8083063 | Iustin Pop | |
896 | a8083063 | Iustin Pop | return used_devs
|
897 | a8083063 | Iustin Pop | |
898 | a8083063 | Iustin Pop | |
899 | a8083063 | Iustin Pop | @classmethod
|
900 | a8083063 | Iustin Pop | def _FindUnusedMinor(cls): |
901 | a8083063 | Iustin Pop | """Find an unused DRBD device.
|
902 | a8083063 | Iustin Pop |
|
903 | a8083063 | Iustin Pop | """
|
904 | a8083063 | Iustin Pop | data = cls._GetProcData() |
905 | a8083063 | Iustin Pop | |
906 | a8083063 | Iustin Pop | valid_line = re.compile("^ *([0-9]+): cs:Unconfigured$")
|
907 | a8083063 | Iustin Pop | for line in data: |
908 | a8083063 | Iustin Pop | match = valid_line.match(line) |
909 | a8083063 | Iustin Pop | if match:
|
910 | a8083063 | Iustin Pop | return int(match.group(1)) |
911 | a8083063 | Iustin Pop | logger.Error("Error: no free drbd minors!")
|
912 | a8083063 | Iustin Pop | return None |
913 | a8083063 | Iustin Pop | |
914 | a8083063 | Iustin Pop | |
915 | a8083063 | Iustin Pop | @classmethod
|
916 | a8083063 | Iustin Pop | def _GetDevInfo(cls, minor): |
917 | a8083063 | Iustin Pop | """Get details about a given DRBD minor.
|
918 | a8083063 | Iustin Pop |
|
919 | a8083063 | Iustin Pop | This return, if available, the local backing device in (major,
|
920 | a8083063 | Iustin Pop | minor) formant and the local and remote (ip, port) information.
|
921 | a8083063 | Iustin Pop |
|
922 | a8083063 | Iustin Pop | """
|
923 | a8083063 | Iustin Pop | data = {} |
924 | a8083063 | Iustin Pop | result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"]) |
925 | a8083063 | Iustin Pop | if result.failed:
|
926 | a8083063 | Iustin Pop | logger.Error("Can't display the drbd config: %s" % result.fail_reason)
|
927 | a8083063 | Iustin Pop | return data
|
928 | a8083063 | Iustin Pop | out = result.stdout |
929 | a8083063 | Iustin Pop | if out == "Not configured\n": |
930 | a8083063 | Iustin Pop | return data
|
931 | a8083063 | Iustin Pop | for line in out.splitlines(): |
932 | a8083063 | Iustin Pop | if "local_dev" not in data: |
933 | a8083063 | Iustin Pop | match = re.match("^Lower device: ([0-9]+):([0-9]+) .*$", line)
|
934 | a8083063 | Iustin Pop | if match:
|
935 | a8083063 | Iustin Pop | data["local_dev"] = (int(match.group(1)), int(match.group(2))) |
936 | a8083063 | Iustin Pop | continue
|
937 | a8083063 | Iustin Pop | if "meta_dev" not in data: |
938 | a8083063 | Iustin Pop | match = re.match("^Meta device: (([0-9]+):([0-9]+)|internal).*$", line)
|
939 | a8083063 | Iustin Pop | if match:
|
940 | a8083063 | Iustin Pop | if match.group(2) is not None and match.group(3) is not None: |
941 | a8083063 | Iustin Pop | # matched on the major/minor
|
942 | a8083063 | Iustin Pop | data["meta_dev"] = (int(match.group(2)), int(match.group(3))) |
943 | a8083063 | Iustin Pop | else:
|
944 | a8083063 | Iustin Pop | # matched on the "internal" string
|
945 | a8083063 | Iustin Pop | data["meta_dev"] = match.group(1) |
946 | a8083063 | Iustin Pop | # in this case, no meta_index is in the output
|
947 | a8083063 | Iustin Pop | data["meta_index"] = -1 |
948 | a8083063 | Iustin Pop | continue
|
949 | a8083063 | Iustin Pop | if "meta_index" not in data: |
950 | a8083063 | Iustin Pop | match = re.match("^Meta index: ([0-9]+).*$", line)
|
951 | a8083063 | Iustin Pop | if match:
|
952 | a8083063 | Iustin Pop | data["meta_index"] = int(match.group(1)) |
953 | a8083063 | Iustin Pop | continue
|
954 | a8083063 | Iustin Pop | if "local_addr" not in data: |
955 | a8083063 | Iustin Pop | match = re.match("^Local address: ([0-9.]+):([0-9]+)$", line)
|
956 | a8083063 | Iustin Pop | if match:
|
957 | a8083063 | Iustin Pop | data["local_addr"] = (match.group(1), int(match.group(2))) |
958 | a8083063 | Iustin Pop | continue
|
959 | a8083063 | Iustin Pop | if "remote_addr" not in data: |
960 | a8083063 | Iustin Pop | match = re.match("^Remote address: ([0-9.]+):([0-9]+)$", line)
|
961 | a8083063 | Iustin Pop | if match:
|
962 | a8083063 | Iustin Pop | data["remote_addr"] = (match.group(1), int(match.group(2))) |
963 | a8083063 | Iustin Pop | continue
|
964 | a8083063 | Iustin Pop | return data
|
965 | a8083063 | Iustin Pop | |
966 | a8083063 | Iustin Pop | |
967 | a8083063 | Iustin Pop | def _MatchesLocal(self, info): |
968 | a8083063 | Iustin Pop | """Test if our local config matches with an existing device.
|
969 | a8083063 | Iustin Pop |
|
970 | a8083063 | Iustin Pop | The parameter should be as returned from `_GetDevInfo()`. This
|
971 | a8083063 | Iustin Pop | method tests if our local backing device is the same as the one in
|
972 | a8083063 | Iustin Pop | the info parameter, in effect testing if we look like the given
|
973 | a8083063 | Iustin Pop | device.
|
974 | a8083063 | Iustin Pop |
|
975 | a8083063 | Iustin Pop | """
|
976 | a8083063 | Iustin Pop | if not ("local_dev" in info and "meta_dev" in info and |
977 | a8083063 | Iustin Pop | "meta_index" in info): |
978 | a8083063 | Iustin Pop | return False |
979 | a8083063 | Iustin Pop | |
980 | a8083063 | Iustin Pop | backend = self._children[0] |
981 | a8083063 | Iustin Pop | if backend is not None: |
982 | a8083063 | Iustin Pop | retval = (info["local_dev"] == (backend.major, backend.minor))
|
983 | a8083063 | Iustin Pop | else:
|
984 | a8083063 | Iustin Pop | retval = (info["local_dev"] == (0, 0)) |
985 | a8083063 | Iustin Pop | meta = self._children[1] |
986 | a8083063 | Iustin Pop | if meta is not None: |
987 | a8083063 | Iustin Pop | retval = retval and (info["meta_dev"] == (meta.major, meta.minor)) |
988 | a8083063 | Iustin Pop | retval = retval and (info["meta_index"] == 0) |
989 | a8083063 | Iustin Pop | else:
|
990 | a8083063 | Iustin Pop | retval = retval and (info["meta_dev"] == "internal" and |
991 | a8083063 | Iustin Pop | info["meta_index"] == -1) |
992 | a8083063 | Iustin Pop | return retval
|
993 | a8083063 | Iustin Pop | |
994 | a8083063 | Iustin Pop | |
995 | a8083063 | Iustin Pop | def _MatchesNet(self, info): |
996 | a8083063 | Iustin Pop | """Test if our network config matches with an existing device.
|
997 | a8083063 | Iustin Pop |
|
998 | a8083063 | Iustin Pop | The parameter should be as returned from `_GetDevInfo()`. This
|
999 | a8083063 | Iustin Pop | method tests if our network configuration is the same as the one
|
1000 | a8083063 | Iustin Pop | in the info parameter, in effect testing if we look like the given
|
1001 | a8083063 | Iustin Pop | device.
|
1002 | a8083063 | Iustin Pop |
|
1003 | a8083063 | Iustin Pop | """
|
1004 | a8083063 | Iustin Pop | if (((self._lhost is None and not ("local_addr" in info)) and |
1005 | a8083063 | Iustin Pop | (self._rhost is None and not ("remote_addr" in info)))): |
1006 | a8083063 | Iustin Pop | return True |
1007 | a8083063 | Iustin Pop | |
1008 | a8083063 | Iustin Pop | if self._lhost is None: |
1009 | a8083063 | Iustin Pop | return False |
1010 | a8083063 | Iustin Pop | |
1011 | a8083063 | Iustin Pop | if not ("local_addr" in info and |
1012 | a8083063 | Iustin Pop | "remote_addr" in info): |
1013 | a8083063 | Iustin Pop | return False |
1014 | a8083063 | Iustin Pop | |
1015 | a8083063 | Iustin Pop | retval = (info["local_addr"] == (self._lhost, self._lport)) |
1016 | a8083063 | Iustin Pop | retval = (retval and
|
1017 | a8083063 | Iustin Pop | info["remote_addr"] == (self._rhost, self._rport)) |
1018 | a8083063 | Iustin Pop | return retval
|
1019 | a8083063 | Iustin Pop | |
1020 | a8083063 | Iustin Pop | |
1021 | a8083063 | Iustin Pop | @staticmethod
|
1022 | a8083063 | Iustin Pop | def _IsValidMeta(meta_device): |
1023 | a8083063 | Iustin Pop | """Check if the given meta device looks like a valid one.
|
1024 | a8083063 | Iustin Pop |
|
1025 | a8083063 | Iustin Pop | This currently only check the size, which must be around
|
1026 | a8083063 | Iustin Pop | 128MiB.
|
1027 | a8083063 | Iustin Pop |
|
1028 | a8083063 | Iustin Pop | """
|
1029 | a8083063 | Iustin Pop | result = utils.RunCmd(["blockdev", "--getsize", meta_device]) |
1030 | a8083063 | Iustin Pop | if result.failed:
|
1031 | a8083063 | Iustin Pop | logger.Error("Failed to get device size: %s" % result.fail_reason)
|
1032 | a8083063 | Iustin Pop | return False |
1033 | a8083063 | Iustin Pop | try:
|
1034 | a8083063 | Iustin Pop | sectors = int(result.stdout)
|
1035 | a8083063 | Iustin Pop | except ValueError: |
1036 | a8083063 | Iustin Pop | logger.Error("Invalid output from blockdev: '%s'" % result.stdout)
|
1037 | a8083063 | Iustin Pop | return False |
1038 | a8083063 | Iustin Pop | bytes = sectors * 512
|
1039 | a8083063 | Iustin Pop | if bytes < 128*1024*1024: # less than 128MiB |
1040 | a8083063 | Iustin Pop | logger.Error("Meta device too small (%.2fMib)" % (bytes/1024/1024)) |
1041 | a8083063 | Iustin Pop | return False |
1042 | a8083063 | Iustin Pop | if bytes > (128+32)*1024*1024: # account for an extra (big) PE on LVM |
1043 | a8083063 | Iustin Pop | logger.Error("Meta device too big (%.2fMiB)" % (bytes/1024/1024)) |
1044 | a8083063 | Iustin Pop | return False |
1045 | a8083063 | Iustin Pop | return True |
1046 | a8083063 | Iustin Pop | |
1047 | a8083063 | Iustin Pop | |
1048 | a8083063 | Iustin Pop | @classmethod
|
1049 | a8083063 | Iustin Pop | def _AssembleLocal(cls, minor, backend, meta): |
1050 | a8083063 | Iustin Pop | """Configure the local part of a DRBD device.
|
1051 | a8083063 | Iustin Pop |
|
1052 | a8083063 | Iustin Pop | This is the first thing that must be done on an unconfigured DRBD
|
1053 | a8083063 | Iustin Pop | device. And it must be done only once.
|
1054 | a8083063 | Iustin Pop |
|
1055 | a8083063 | Iustin Pop | """
|
1056 | a8083063 | Iustin Pop | if not cls._IsValidMeta(meta): |
1057 | a8083063 | Iustin Pop | return False |
1058 | a8083063 | Iustin Pop | result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disk", |
1059 | a8083063 | Iustin Pop | backend, meta, "0", "-e", "detach"]) |
1060 | a8083063 | Iustin Pop | if result.failed:
|
1061 | a8083063 | Iustin Pop | logger.Error("Can't attach local disk: %s" % result.output)
|
1062 | a8083063 | Iustin Pop | return not result.failed |
1063 | a8083063 | Iustin Pop | |
1064 | a8083063 | Iustin Pop | |
1065 | a8083063 | Iustin Pop | @classmethod
|
1066 | a8083063 | Iustin Pop | def _ShutdownLocal(cls, minor): |
1067 | a8083063 | Iustin Pop | """Detach from the local device.
|
1068 | a8083063 | Iustin Pop |
|
1069 | a8083063 | Iustin Pop | I/Os will continue to be served from the remote device. If we
|
1070 | a8083063 | Iustin Pop | don't have a remote device, this operation will fail.
|
1071 | a8083063 | Iustin Pop |
|
1072 | a8083063 | Iustin Pop | """
|
1073 | a8083063 | Iustin Pop | result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "detach"]) |
1074 | a8083063 | Iustin Pop | if result.failed:
|
1075 | a8083063 | Iustin Pop | logger.Error("Can't detach local device: %s" % result.output)
|
1076 | a8083063 | Iustin Pop | return not result.failed |
1077 | a8083063 | Iustin Pop | |
1078 | a8083063 | Iustin Pop | |
1079 | a8083063 | Iustin Pop | @staticmethod
|
1080 | a8083063 | Iustin Pop | def _ShutdownAll(minor): |
1081 | a8083063 | Iustin Pop | """Deactivate the device.
|
1082 | a8083063 | Iustin Pop |
|
1083 | a8083063 | Iustin Pop | This will, of course, fail if the device is in use.
|
1084 | a8083063 | Iustin Pop |
|
1085 | a8083063 | Iustin Pop | """
|
1086 | a8083063 | Iustin Pop | result = utils.RunCmd(["drbdsetup", DRBDev._DevPath(minor), "down"]) |
1087 | a8083063 | Iustin Pop | if result.failed:
|
1088 | a8083063 | Iustin Pop | logger.Error("Can't shutdown drbd device: %s" % result.output)
|
1089 | a8083063 | Iustin Pop | return not result.failed |
1090 | a8083063 | Iustin Pop | |
1091 | a8083063 | Iustin Pop | |
1092 | a8083063 | Iustin Pop | @classmethod
|
1093 | a8083063 | Iustin Pop | def _AssembleNet(cls, minor, net_info, protocol): |
1094 | a8083063 | Iustin Pop | """Configure the network part of the device.
|
1095 | a8083063 | Iustin Pop |
|
1096 | a8083063 | Iustin Pop | This operation can be, in theory, done multiple times, but there
|
1097 | a8083063 | Iustin Pop | have been cases (in lab testing) in which the network part of the
|
1098 | a8083063 | Iustin Pop | device had become stuck and couldn't be shut down because activity
|
1099 | a8083063 | Iustin Pop | from the new peer (also stuck) triggered a timer re-init and
|
1100 | a8083063 | Iustin Pop | needed remote peer interface shutdown in order to clear. So please
|
1101 | a8083063 | Iustin Pop | don't change online the net config.
|
1102 | a8083063 | Iustin Pop |
|
1103 | a8083063 | Iustin Pop | """
|
1104 | a8083063 | Iustin Pop | lhost, lport, rhost, rport = net_info |
1105 | a8083063 | Iustin Pop | result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "net", |
1106 | a8083063 | Iustin Pop | "%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), |
1107 | a8083063 | Iustin Pop | protocol]) |
1108 | a8083063 | Iustin Pop | if result.failed:
|
1109 | a8083063 | Iustin Pop | logger.Error("Can't setup network for dbrd device: %s" %
|
1110 | a8083063 | Iustin Pop | result.fail_reason) |
1111 | a8083063 | Iustin Pop | return False |
1112 | a8083063 | Iustin Pop | |
1113 | a8083063 | Iustin Pop | timeout = time.time() + 10
|
1114 | a8083063 | Iustin Pop | ok = False
|
1115 | a8083063 | Iustin Pop | while time.time() < timeout:
|
1116 | a8083063 | Iustin Pop | info = cls._GetDevInfo(minor) |
1117 | a8083063 | Iustin Pop | if not "local_addr" in info or not "remote_addr" in info: |
1118 | a8083063 | Iustin Pop | time.sleep(1)
|
1119 | a8083063 | Iustin Pop | continue
|
1120 | a8083063 | Iustin Pop | if (info["local_addr"] != (lhost, lport) or |
1121 | a8083063 | Iustin Pop | info["remote_addr"] != (rhost, rport)):
|
1122 | a8083063 | Iustin Pop | time.sleep(1)
|
1123 | a8083063 | Iustin Pop | continue
|
1124 | a8083063 | Iustin Pop | ok = True
|
1125 | a8083063 | Iustin Pop | break
|
1126 | a8083063 | Iustin Pop | if not ok: |
1127 | a8083063 | Iustin Pop | logger.Error("Timeout while configuring network")
|
1128 | a8083063 | Iustin Pop | return False |
1129 | a8083063 | Iustin Pop | return True |
1130 | a8083063 | Iustin Pop | |
1131 | a8083063 | Iustin Pop | |
1132 | a8083063 | Iustin Pop | @classmethod
|
1133 | a8083063 | Iustin Pop | def _ShutdownNet(cls, minor): |
1134 | a8083063 | Iustin Pop | """Disconnect from the remote peer.
|
1135 | a8083063 | Iustin Pop |
|
1136 | a8083063 | Iustin Pop | This fails if we don't have a local device.
|
1137 | a8083063 | Iustin Pop |
|
1138 | a8083063 | Iustin Pop | """
|
1139 | a8083063 | Iustin Pop | result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disconnect"]) |
1140 | a8083063 | Iustin Pop | logger.Error("Can't shutdown network: %s" % result.output)
|
1141 | a8083063 | Iustin Pop | return not result.failed |
1142 | a8083063 | Iustin Pop | |
1143 | a8083063 | Iustin Pop | |
1144 | a8083063 | Iustin Pop | def _SetFromMinor(self, minor): |
1145 | a8083063 | Iustin Pop | """Set our parameters based on the given minor.
|
1146 | a8083063 | Iustin Pop |
|
1147 | a8083063 | Iustin Pop | This sets our minor variable and our dev_path.
|
1148 | a8083063 | Iustin Pop |
|
1149 | a8083063 | Iustin Pop | """
|
1150 | a8083063 | Iustin Pop | if minor is None: |
1151 | a8083063 | Iustin Pop | self.minor = self.dev_path = None |
1152 | a8083063 | Iustin Pop | else:
|
1153 | a8083063 | Iustin Pop | self.minor = minor
|
1154 | a8083063 | Iustin Pop | self.dev_path = self._DevPath(minor) |
1155 | a8083063 | Iustin Pop | |
1156 | a8083063 | Iustin Pop | |
1157 | a8083063 | Iustin Pop | def Assemble(self): |
1158 | a8083063 | Iustin Pop | """Assemble the drbd.
|
1159 | a8083063 | Iustin Pop |
|
1160 | a8083063 | Iustin Pop | Method:
|
1161 | a8083063 | Iustin Pop | - if we have a local backing device, we bind to it by:
|
1162 | a8083063 | Iustin Pop | - checking the list of used drbd devices
|
1163 | a8083063 | Iustin Pop | - check if the local minor use of any of them is our own device
|
1164 | a8083063 | Iustin Pop | - if yes, abort?
|
1165 | a8083063 | Iustin Pop | - if not, bind
|
1166 | a8083063 | Iustin Pop | - if we have a local/remote net info:
|
1167 | a8083063 | Iustin Pop | - redo the local backing device step for the remote device
|
1168 | a8083063 | Iustin Pop | - check if any drbd device is using the local port,
|
1169 | a8083063 | Iustin Pop | if yes abort
|
1170 | a8083063 | Iustin Pop | - check if any remote drbd device is using the remote
|
1171 | a8083063 | Iustin Pop | port, if yes abort (for now)
|
1172 | a8083063 | Iustin Pop | - bind our net port
|
1173 | a8083063 | Iustin Pop | - bind the remote net port
|
1174 | a8083063 | Iustin Pop |
|
1175 | a8083063 | Iustin Pop | """
|
1176 | a8083063 | Iustin Pop | self.Attach()
|
1177 | a8083063 | Iustin Pop | if self.minor is not None: |
1178 | a8083063 | Iustin Pop | logger.Info("Already assembled")
|
1179 | a8083063 | Iustin Pop | return True |
1180 | a8083063 | Iustin Pop | |
1181 | a8083063 | Iustin Pop | result = super(DRBDev, self).Assemble() |
1182 | a8083063 | Iustin Pop | if not result: |
1183 | a8083063 | Iustin Pop | return result
|
1184 | a8083063 | Iustin Pop | |
1185 | a8083063 | Iustin Pop | minor = self._FindUnusedMinor()
|
1186 | a8083063 | Iustin Pop | if minor is None: |
1187 | a8083063 | Iustin Pop | raise errors.BlockDeviceError, "Not enough free minors for DRBD!" |
1188 | a8083063 | Iustin Pop | need_localdev_teardown = False
|
1189 | a8083063 | Iustin Pop | if self._children[0]: |
1190 | a8083063 | Iustin Pop | result = self._AssembleLocal(minor, self._children[0].dev_path, |
1191 | a8083063 | Iustin Pop | self._children[1].dev_path) |
1192 | a8083063 | Iustin Pop | if not result: |
1193 | a8083063 | Iustin Pop | return False |
1194 | a8083063 | Iustin Pop | need_localdev_teardown = True
|
1195 | a8083063 | Iustin Pop | if self._lhost and self._lport and self._rhost and self._rport: |
1196 | a8083063 | Iustin Pop | result = self._AssembleNet(minor,
|
1197 | a8083063 | Iustin Pop | (self._lhost, self._lport, |
1198 | a8083063 | Iustin Pop | self._rhost, self._rport), |
1199 | a8083063 | Iustin Pop | "C")
|
1200 | a8083063 | Iustin Pop | if not result: |
1201 | a8083063 | Iustin Pop | if need_localdev_teardown:
|
1202 | a8083063 | Iustin Pop | # we will ignore failures from this
|
1203 | a8083063 | Iustin Pop | logger.Error("net setup failed, tearing down local device")
|
1204 | a8083063 | Iustin Pop | self._ShutdownAll(minor)
|
1205 | a8083063 | Iustin Pop | return False |
1206 | a8083063 | Iustin Pop | self._SetFromMinor(minor)
|
1207 | a8083063 | Iustin Pop | return True |
1208 | a8083063 | Iustin Pop | |
1209 | a8083063 | Iustin Pop | |
1210 | a8083063 | Iustin Pop | def Shutdown(self): |
1211 | a8083063 | Iustin Pop | """Shutdown the DRBD device.
|
1212 | a8083063 | Iustin Pop |
|
1213 | a8083063 | Iustin Pop | """
|
1214 | a8083063 | Iustin Pop | if self.minor is None and not self.Attach(): |
1215 | a8083063 | Iustin Pop | logger.Info("DRBD device not attached to a device during Shutdown")
|
1216 | a8083063 | Iustin Pop | return True |
1217 | a8083063 | Iustin Pop | if not self._ShutdownAll(self.minor): |
1218 | a8083063 | Iustin Pop | return False |
1219 | a8083063 | Iustin Pop | self.minor = None |
1220 | a8083063 | Iustin Pop | self.dev_path = None |
1221 | a8083063 | Iustin Pop | return True |
1222 | a8083063 | Iustin Pop | |
1223 | a8083063 | Iustin Pop | |
1224 | a8083063 | Iustin Pop | def Attach(self): |
1225 | a8083063 | Iustin Pop | """Find a DRBD device which matches our config and attach to it.
|
1226 | a8083063 | Iustin Pop |
|
1227 | a8083063 | Iustin Pop | In case of partially attached (local device matches but no network
|
1228 | a8083063 | Iustin Pop | setup), we perform the network attach. If successful, we re-test
|
1229 | a8083063 | Iustin Pop | the attach if can return success.
|
1230 | a8083063 | Iustin Pop |
|
1231 | a8083063 | Iustin Pop | """
|
1232 | a8083063 | Iustin Pop | for minor in self._GetUsedDevs(): |
1233 | a8083063 | Iustin Pop | info = self._GetDevInfo(minor)
|
1234 | a8083063 | Iustin Pop | match_l = self._MatchesLocal(info)
|
1235 | a8083063 | Iustin Pop | match_r = self._MatchesNet(info)
|
1236 | a8083063 | Iustin Pop | if match_l and match_r: |
1237 | a8083063 | Iustin Pop | break
|
1238 | a8083063 | Iustin Pop | if match_l and not match_r and "local_addr" not in info: |
1239 | a8083063 | Iustin Pop | res_r = self._AssembleNet(minor,
|
1240 | a8083063 | Iustin Pop | (self._lhost, self._lport, |
1241 | a8083063 | Iustin Pop | self._rhost, self._rport), |
1242 | a8083063 | Iustin Pop | "C")
|
1243 | a8083063 | Iustin Pop | if res_r and self._MatchesNet(self._GetDevInfo(minor)): |
1244 | a8083063 | Iustin Pop | break
|
1245 | a8083063 | Iustin Pop | else:
|
1246 | a8083063 | Iustin Pop | minor = None
|
1247 | a8083063 | Iustin Pop | |
1248 | a8083063 | Iustin Pop | self._SetFromMinor(minor)
|
1249 | a8083063 | Iustin Pop | return minor is not None |
1250 | a8083063 | Iustin Pop | |
1251 | a8083063 | Iustin Pop | |
1252 | a8083063 | Iustin Pop | def Open(self, force=False): |
1253 | a8083063 | Iustin Pop | """Make the local state primary.
|
1254 | a8083063 | Iustin Pop |
|
1255 | a8083063 | Iustin Pop | If the 'force' parameter is given, the '--do-what-I-say' parameter
|
1256 | a8083063 | Iustin Pop | is given. Since this is a pottentialy dangerous operation, the
|
1257 | a8083063 | Iustin Pop | force flag should be only given after creation, when it actually
|
1258 | a8083063 | Iustin Pop | has to be given.
|
1259 | a8083063 | Iustin Pop |
|
1260 | a8083063 | Iustin Pop | """
|
1261 | a8083063 | Iustin Pop | if self.minor is None and not self.Attach(): |
1262 | a8083063 | Iustin Pop | logger.Error("DRBD cannot attach to a device during open")
|
1263 | a8083063 | Iustin Pop | return False |
1264 | a8083063 | Iustin Pop | cmd = ["drbdsetup", self.dev_path, "primary"] |
1265 | a8083063 | Iustin Pop | if force:
|
1266 | a8083063 | Iustin Pop | cmd.append("--do-what-I-say")
|
1267 | a8083063 | Iustin Pop | result = utils.RunCmd(cmd) |
1268 | a8083063 | Iustin Pop | if result.failed:
|
1269 | a8083063 | Iustin Pop | logger.Error("Can't make drbd device primary: %s" % result.output)
|
1270 | a8083063 | Iustin Pop | return False |
1271 | a8083063 | Iustin Pop | return True |
1272 | a8083063 | Iustin Pop | |
1273 | a8083063 | Iustin Pop | |
1274 | a8083063 | Iustin Pop | def Close(self): |
1275 | a8083063 | Iustin Pop | """Make the local state secondary.
|
1276 | a8083063 | Iustin Pop |
|
1277 | a8083063 | Iustin Pop | This will, of course, fail if the device is in use.
|
1278 | a8083063 | Iustin Pop |
|
1279 | a8083063 | Iustin Pop | """
|
1280 | a8083063 | Iustin Pop | if self.minor is None and not self.Attach(): |
1281 | a8083063 | Iustin Pop | logger.Info("Instance not attached to a device")
|
1282 | a8083063 | Iustin Pop | raise errors.BlockDeviceError("Can't find device") |
1283 | a8083063 | Iustin Pop | result = utils.RunCmd(["drbdsetup", self.dev_path, "secondary"]) |
1284 | a8083063 | Iustin Pop | if result.failed:
|
1285 | a8083063 | Iustin Pop | logger.Error("Can't switch drbd device to secondary: %s" % result.output)
|
1286 | a8083063 | Iustin Pop | raise errors.BlockDeviceError("Can't switch drbd device to secondary") |
1287 | a8083063 | Iustin Pop | |
1288 | a8083063 | Iustin Pop | |
1289 | a8083063 | Iustin Pop | def SetSyncSpeed(self, kbytes): |
1290 | a8083063 | Iustin Pop | """Set the speed of the DRBD syncer.
|
1291 | a8083063 | Iustin Pop |
|
1292 | a8083063 | Iustin Pop | """
|
1293 | a8083063 | Iustin Pop | children_result = super(DRBDev, self).SetSyncSpeed(kbytes) |
1294 | a8083063 | Iustin Pop | if self.minor is None: |
1295 | a8083063 | Iustin Pop | logger.Info("Instance not attached to a device")
|
1296 | a8083063 | Iustin Pop | return False |
1297 | a8083063 | Iustin Pop | result = utils.RunCmd(["drbdsetup", self.dev_path, "syncer", "-r", "%d" % |
1298 | a8083063 | Iustin Pop | kbytes]) |
1299 | a8083063 | Iustin Pop | if result.failed:
|
1300 | a8083063 | Iustin Pop | logger.Error("Can't change syncer rate: %s " % result.fail_reason)
|
1301 | a8083063 | Iustin Pop | return not result.failed and children_result |
1302 | a8083063 | Iustin Pop | |
1303 | a8083063 | Iustin Pop | |
1304 | a8083063 | Iustin Pop | def GetSyncStatus(self): |
1305 | a8083063 | Iustin Pop | """Returns the sync status of the device.
|
1306 | a8083063 | Iustin Pop |
|
1307 | a8083063 | Iustin Pop | Returns:
|
1308 | a8083063 | Iustin Pop | (sync_percent, estimated_time)
|
1309 | a8083063 | Iustin Pop |
|
1310 | a8083063 | Iustin Pop | If sync_percent is None, it means all is ok
|
1311 | a8083063 | Iustin Pop | If estimated_time is None, it means we can't esimate
|
1312 | a8083063 | Iustin Pop | the time needed, otherwise it's the time left in seconds
|
1313 | a8083063 | Iustin Pop |
|
1314 | a8083063 | Iustin Pop | """
|
1315 | a8083063 | Iustin Pop | if self.minor is None and not self.Attach(): |
1316 | a8083063 | Iustin Pop | raise errors.BlockDeviceError("Can't attach to device in GetSyncStatus") |
1317 | a8083063 | Iustin Pop | proc_info = self._MassageProcData(self._GetProcData()) |
1318 | a8083063 | Iustin Pop | if self.minor not in proc_info: |
1319 | a8083063 | Iustin Pop | raise errors.BlockDeviceError("Can't find myself in /proc (minor %d)" % |
1320 | a8083063 | Iustin Pop | self.minor)
|
1321 | a8083063 | Iustin Pop | line = proc_info[self.minor]
|
1322 | a8083063 | Iustin Pop | match = re.match("^.*sync'ed: *([0-9.]+)%.*"
|
1323 | a8083063 | Iustin Pop | " finish: ([0-9]+):([0-9]+):([0-9]+) .*$", line)
|
1324 | a8083063 | Iustin Pop | if match:
|
1325 | a8083063 | Iustin Pop | sync_percent = float(match.group(1)) |
1326 | a8083063 | Iustin Pop | hours = int(match.group(2)) |
1327 | a8083063 | Iustin Pop | minutes = int(match.group(3)) |
1328 | a8083063 | Iustin Pop | seconds = int(match.group(4)) |
1329 | a8083063 | Iustin Pop | est_time = hours * 3600 + minutes * 60 + seconds |
1330 | a8083063 | Iustin Pop | else:
|
1331 | a8083063 | Iustin Pop | sync_percent = None
|
1332 | a8083063 | Iustin Pop | est_time = None
|
1333 | a8083063 | Iustin Pop | match = re.match("^ *[0-9]+: cs:([^ ]+).*$", line)
|
1334 | a8083063 | Iustin Pop | if not match: |
1335 | a8083063 | Iustin Pop | raise errors.BlockDeviceError("Can't find my data in /proc (minor %d)" % |
1336 | a8083063 | Iustin Pop | self.minor)
|
1337 | a8083063 | Iustin Pop | client_state = match.group(1)
|
1338 | a8083063 | Iustin Pop | is_degraded = client_state != "Connected"
|
1339 | a8083063 | Iustin Pop | return sync_percent, est_time, is_degraded
|
1340 | a8083063 | Iustin Pop | |
1341 | a8083063 | Iustin Pop | |
1342 | a8083063 | Iustin Pop | @staticmethod
|
1343 | a8083063 | Iustin Pop | def _MassageProcData(data): |
1344 | a8083063 | Iustin Pop | """Transform the output of _GetProdData into a nicer form.
|
1345 | a8083063 | Iustin Pop |
|
1346 | a8083063 | Iustin Pop | Returns:
|
1347 | a8083063 | Iustin Pop | a dictionary of minor: joined lines from /proc/drbd for that minor
|
1348 | a8083063 | Iustin Pop |
|
1349 | a8083063 | Iustin Pop | """
|
1350 | a8083063 | Iustin Pop | lmatch = re.compile("^ *([0-9]+):.*$")
|
1351 | a8083063 | Iustin Pop | results = {} |
1352 | a8083063 | Iustin Pop | old_minor = old_line = None
|
1353 | a8083063 | Iustin Pop | for line in data: |
1354 | a8083063 | Iustin Pop | lresult = lmatch.match(line) |
1355 | a8083063 | Iustin Pop | if lresult is not None: |
1356 | a8083063 | Iustin Pop | if old_minor is not None: |
1357 | a8083063 | Iustin Pop | results[old_minor] = old_line |
1358 | a8083063 | Iustin Pop | old_minor = int(lresult.group(1)) |
1359 | a8083063 | Iustin Pop | old_line = line |
1360 | a8083063 | Iustin Pop | else:
|
1361 | a8083063 | Iustin Pop | if old_minor is not None: |
1362 | a8083063 | Iustin Pop | old_line += " " + line.strip()
|
1363 | a8083063 | Iustin Pop | # add last line
|
1364 | a8083063 | Iustin Pop | if old_minor is not None: |
1365 | a8083063 | Iustin Pop | results[old_minor] = old_line |
1366 | a8083063 | Iustin Pop | return results
|
1367 | a8083063 | Iustin Pop | |
1368 | a8083063 | Iustin Pop | |
1369 | a8083063 | Iustin Pop | def GetStatus(self): |
1370 | a8083063 | Iustin Pop | """Compute the status of the DRBD device
|
1371 | a8083063 | Iustin Pop |
|
1372 | a8083063 | Iustin Pop | Note that DRBD devices don't have the STATUS_EXISTING state.
|
1373 | a8083063 | Iustin Pop |
|
1374 | a8083063 | Iustin Pop | """
|
1375 | a8083063 | Iustin Pop | if self.minor is None and not self.Attach(): |
1376 | a8083063 | Iustin Pop | return self.STATUS_UNKNOWN |
1377 | a8083063 | Iustin Pop | |
1378 | a8083063 | Iustin Pop | data = self._GetProcData()
|
1379 | a8083063 | Iustin Pop | match = re.compile("^ *%d: cs:[^ ]+ st:(Primary|Secondary)/.*$" %
|
1380 | a8083063 | Iustin Pop | self.minor)
|
1381 | a8083063 | Iustin Pop | for line in data: |
1382 | a8083063 | Iustin Pop | mresult = match.match(line) |
1383 | a8083063 | Iustin Pop | if mresult:
|
1384 | a8083063 | Iustin Pop | break
|
1385 | a8083063 | Iustin Pop | else:
|
1386 | a8083063 | Iustin Pop | logger.Error("Can't find myself!")
|
1387 | a8083063 | Iustin Pop | return self.STATUS_UNKNOWN |
1388 | a8083063 | Iustin Pop | |
1389 | a8083063 | Iustin Pop | state = mresult.group(2)
|
1390 | a8083063 | Iustin Pop | if state == "Primary": |
1391 | a8083063 | Iustin Pop | result = self.STATUS_ONLINE
|
1392 | a8083063 | Iustin Pop | else:
|
1393 | a8083063 | Iustin Pop | result = self.STATUS_STANDBY
|
1394 | a8083063 | Iustin Pop | |
1395 | a8083063 | Iustin Pop | return result
|
1396 | a8083063 | Iustin Pop | |
1397 | a8083063 | Iustin Pop | |
1398 | a8083063 | Iustin Pop | @staticmethod
|
1399 | a8083063 | Iustin Pop | def _ZeroDevice(device): |
1400 | a8083063 | Iustin Pop | """Zero a device.
|
1401 | a8083063 | Iustin Pop |
|
1402 | a8083063 | Iustin Pop | This writes until we get ENOSPC.
|
1403 | a8083063 | Iustin Pop |
|
1404 | a8083063 | Iustin Pop | """
|
1405 | a8083063 | Iustin Pop | f = open(device, "w") |
1406 | a8083063 | Iustin Pop | buf = "\0" * 1048576 |
1407 | a8083063 | Iustin Pop | try:
|
1408 | a8083063 | Iustin Pop | while True: |
1409 | a8083063 | Iustin Pop | f.write(buf) |
1410 | a8083063 | Iustin Pop | except IOError, err: |
1411 | a8083063 | Iustin Pop | if err.errno != errno.ENOSPC:
|
1412 | a8083063 | Iustin Pop | raise
|
1413 | a8083063 | Iustin Pop | |
1414 | a8083063 | Iustin Pop | |
1415 | a8083063 | Iustin Pop | @classmethod
|
1416 | a8083063 | Iustin Pop | def Create(cls, unique_id, children, size): |
1417 | a8083063 | Iustin Pop | """Create a new DRBD device.
|
1418 | a8083063 | Iustin Pop |
|
1419 | a8083063 | Iustin Pop | Since DRBD devices are not created per se, just assembled, this
|
1420 | a8083063 | Iustin Pop | function just zeroes the meta device.
|
1421 | a8083063 | Iustin Pop |
|
1422 | a8083063 | Iustin Pop | """
|
1423 | a8083063 | Iustin Pop | if len(children) != 2: |
1424 | a8083063 | Iustin Pop | raise errors.ProgrammerError("Invalid setup for the drbd device") |
1425 | a8083063 | Iustin Pop | meta = children[1]
|
1426 | a8083063 | Iustin Pop | meta.Assemble() |
1427 | a8083063 | Iustin Pop | if not meta.Attach(): |
1428 | a8083063 | Iustin Pop | raise errors.BlockDeviceError("Can't attach to meta device") |
1429 | a8083063 | Iustin Pop | if not cls._IsValidMeta(meta.dev_path): |
1430 | a8083063 | Iustin Pop | raise errors.BlockDeviceError("Invalid meta device") |
1431 | a8083063 | Iustin Pop | logger.Info("Started zeroing device %s" % meta.dev_path)
|
1432 | a8083063 | Iustin Pop | cls._ZeroDevice(meta.dev_path) |
1433 | a8083063 | Iustin Pop | logger.Info("Done zeroing device %s" % meta.dev_path)
|
1434 | a8083063 | Iustin Pop | return cls(unique_id, children)
|
1435 | a8083063 | Iustin Pop | |
1436 | a8083063 | Iustin Pop | |
1437 | a8083063 | Iustin Pop | def Remove(self): |
1438 | a8083063 | Iustin Pop | """Stub remove for DRBD devices.
|
1439 | a8083063 | Iustin Pop |
|
1440 | a8083063 | Iustin Pop | """
|
1441 | a8083063 | Iustin Pop | return self.Shutdown() |
1442 | a8083063 | Iustin Pop | |
1443 | a8083063 | Iustin Pop | |
1444 | a8083063 | Iustin Pop | DEV_MAP = { |
1445 | a8083063 | Iustin Pop | "lvm": LogicalVolume,
|
1446 | a8083063 | Iustin Pop | "md_raid1": MDRaid1,
|
1447 | a8083063 | Iustin Pop | "drbd": DRBDev,
|
1448 | a8083063 | Iustin Pop | } |
1449 | a8083063 | Iustin Pop | |
1450 | a8083063 | Iustin Pop | |
1451 | a8083063 | Iustin Pop | def FindDevice(dev_type, unique_id, children): |
1452 | a8083063 | Iustin Pop | """Search for an existing, assembled device.
|
1453 | a8083063 | Iustin Pop |
|
1454 | a8083063 | Iustin Pop | This will succeed only if the device exists and is assembled, but it
|
1455 | a8083063 | Iustin Pop | does not do any actions in order to activate the device.
|
1456 | a8083063 | Iustin Pop |
|
1457 | a8083063 | Iustin Pop | """
|
1458 | a8083063 | Iustin Pop | if dev_type not in DEV_MAP: |
1459 | a8083063 | Iustin Pop | raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
1460 | a8083063 | Iustin Pop | device = DEV_MAP[dev_type](unique_id, children) |
1461 | a8083063 | Iustin Pop | if not device.Attach(): |
1462 | a8083063 | Iustin Pop | return None |
1463 | a8083063 | Iustin Pop | return device
|
1464 | a8083063 | Iustin Pop | |
1465 | a8083063 | Iustin Pop | |
1466 | a8083063 | Iustin Pop | def AttachOrAssemble(dev_type, unique_id, children): |
1467 | a8083063 | Iustin Pop | """Try to attach or assemble an existing device.
|
1468 | a8083063 | Iustin Pop |
|
1469 | a8083063 | Iustin Pop | This will attach to an existing assembled device or will assemble
|
1470 | a8083063 | Iustin Pop | the device, as needed, to bring it fully up.
|
1471 | a8083063 | Iustin Pop |
|
1472 | a8083063 | Iustin Pop | """
|
1473 | a8083063 | Iustin Pop | if dev_type not in DEV_MAP: |
1474 | a8083063 | Iustin Pop | raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
1475 | a8083063 | Iustin Pop | device = DEV_MAP[dev_type](unique_id, children) |
1476 | a8083063 | Iustin Pop | if not device.Attach(): |
1477 | a8083063 | Iustin Pop | device.Assemble() |
1478 | a8083063 | Iustin Pop | if not device.Attach(): |
1479 | a8083063 | Iustin Pop | raise errors.BlockDeviceError("Can't find a valid block device for" |
1480 | a8083063 | Iustin Pop | " %s/%s/%s" %
|
1481 | a8083063 | Iustin Pop | (dev_type, unique_id, children)) |
1482 | a8083063 | Iustin Pop | return device
|
1483 | a8083063 | Iustin Pop | |
1484 | a8083063 | Iustin Pop | |
1485 | a8083063 | Iustin Pop | def Create(dev_type, unique_id, children, size): |
1486 | a8083063 | Iustin Pop | """Create a device.
|
1487 | a8083063 | Iustin Pop |
|
1488 | a8083063 | Iustin Pop | """
|
1489 | a8083063 | Iustin Pop | if dev_type not in DEV_MAP: |
1490 | a8083063 | Iustin Pop | raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
1491 | a8083063 | Iustin Pop | device = DEV_MAP[dev_type].Create(unique_id, children, size) |
1492 | a8083063 | Iustin Pop | return device |