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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 | a2cfdea2 | Iustin Pop | import pyparsing as pyp |
28 | 6f695a2e | Manuel Franceschini | import os |
29 | 468c5f77 | Iustin Pop | import logging |
30 | a8083063 | Iustin Pop | |
31 | a8083063 | Iustin Pop | from ganeti import utils |
32 | a8083063 | Iustin Pop | from ganeti import errors |
33 | fe96220b | Iustin Pop | from ganeti import constants |
34 | a8083063 | Iustin Pop | |
35 | a8083063 | Iustin Pop | |
36 | a8083063 | Iustin Pop | class BlockDev(object): |
37 | a8083063 | Iustin Pop | """Block device abstract class.
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38 | a8083063 | Iustin Pop |
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39 | a8083063 | Iustin Pop | A block device can be in the following states:
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40 | a8083063 | Iustin Pop | - not existing on the system, and by `Create()` it goes into:
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41 | a8083063 | Iustin Pop | - existing but not setup/not active, and by `Assemble()` goes into:
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42 | a8083063 | Iustin Pop | - active read-write and by `Open()` it goes into
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43 | a8083063 | Iustin Pop | - online (=used, or ready for use)
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44 | a8083063 | Iustin Pop |
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45 | a8083063 | Iustin Pop | A device can also be online but read-only, however we are not using
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46 | abdf0113 | Iustin Pop | the readonly state (LV has it, if needed in the future) and we are
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47 | abdf0113 | Iustin Pop | usually looking at this like at a stack, so it's easier to
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48 | abdf0113 | Iustin Pop | conceptualise the transition from not-existing to online and back
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49 | a8083063 | Iustin Pop | like a linear one.
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50 | a8083063 | Iustin Pop |
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51 | a8083063 | Iustin Pop | The many different states of the device are due to the fact that we
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52 | a8083063 | Iustin Pop | need to cover many device types:
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53 | a8083063 | Iustin Pop | - logical volumes are created, lvchange -a y $lv, and used
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54 | a8083063 | Iustin Pop | - drbd devices are attached to a local disk/remote peer and made primary
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55 | a8083063 | Iustin Pop |
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56 | a8083063 | Iustin Pop | A block device is identified by three items:
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57 | a8083063 | Iustin Pop | - the /dev path of the device (dynamic)
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58 | a8083063 | Iustin Pop | - a unique ID of the device (static)
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59 | a8083063 | Iustin Pop | - it's major/minor pair (dynamic)
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60 | a8083063 | Iustin Pop |
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61 | a8083063 | Iustin Pop | Not all devices implement both the first two as distinct items. LVM
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62 | a8083063 | Iustin Pop | logical volumes have their unique ID (the pair volume group, logical
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63 | abdf0113 | Iustin Pop | volume name) in a 1-to-1 relation to the dev path. For DRBD devices,
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64 | abdf0113 | Iustin Pop | the /dev path is again dynamic and the unique id is the pair (host1,
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65 | abdf0113 | Iustin Pop | dev1), (host2, dev2).
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66 | a8083063 | Iustin Pop |
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67 | a8083063 | Iustin Pop | You can get to a device in two ways:
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68 | a8083063 | Iustin Pop | - creating the (real) device, which returns you
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69 | abdf0113 | Iustin Pop | an attached instance (lvcreate)
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70 | a8083063 | Iustin Pop | - attaching of a python instance to an existing (real) device
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71 | a8083063 | Iustin Pop |
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72 | a8083063 | Iustin Pop | The second point, the attachement to a device, is different
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73 | a8083063 | Iustin Pop | depending on whether the device is assembled or not. At init() time,
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74 | a8083063 | Iustin Pop | we search for a device with the same unique_id as us. If found,
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75 | a8083063 | Iustin Pop | good. It also means that the device is already assembled. If not,
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76 | a8083063 | Iustin Pop | after assembly we'll have our correct major/minor.
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77 | a8083063 | Iustin Pop |
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78 | a8083063 | Iustin Pop | """
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79 | a8083063 | Iustin Pop | def __init__(self, unique_id, children): |
80 | a8083063 | Iustin Pop | self._children = children
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81 | a8083063 | Iustin Pop | self.dev_path = None |
82 | a8083063 | Iustin Pop | self.unique_id = unique_id
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83 | a8083063 | Iustin Pop | self.major = None |
84 | a8083063 | Iustin Pop | self.minor = None |
85 | cb999543 | Iustin Pop | self.attached = False |
86 | a8083063 | Iustin Pop | |
87 | a8083063 | Iustin Pop | def Assemble(self): |
88 | a8083063 | Iustin Pop | """Assemble the device from its components.
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89 | a8083063 | Iustin Pop |
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90 | f87548b5 | Iustin Pop | Implementations of this method by child classes must ensure that:
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91 | f87548b5 | Iustin Pop | - after the device has been assembled, it knows its major/minor
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92 | f87548b5 | Iustin Pop | numbers; this allows other devices (usually parents) to probe
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93 | f87548b5 | Iustin Pop | correctly for their children
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94 | f87548b5 | Iustin Pop | - calling this method on an existing, in-use device is safe
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95 | f87548b5 | Iustin Pop | - if the device is already configured (and in an OK state),
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96 | f87548b5 | Iustin Pop | this method is idempotent
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97 | a8083063 | Iustin Pop |
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98 | a8083063 | Iustin Pop | """
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99 | f87548b5 | Iustin Pop | return True |
100 | a8083063 | Iustin Pop | |
101 | a8083063 | Iustin Pop | def Attach(self): |
102 | a8083063 | Iustin Pop | """Find a device which matches our config and attach to it.
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103 | a8083063 | Iustin Pop |
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104 | a8083063 | Iustin Pop | """
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105 | a8083063 | Iustin Pop | raise NotImplementedError |
106 | a8083063 | Iustin Pop | |
107 | a8083063 | Iustin Pop | def Close(self): |
108 | a8083063 | Iustin Pop | """Notifies that the device will no longer be used for I/O.
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109 | a8083063 | Iustin Pop |
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110 | a8083063 | Iustin Pop | """
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111 | a8083063 | Iustin Pop | raise NotImplementedError |
112 | a8083063 | Iustin Pop | |
113 | a8083063 | Iustin Pop | @classmethod
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114 | a8083063 | Iustin Pop | def Create(cls, unique_id, children, size): |
115 | a8083063 | Iustin Pop | """Create the device.
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116 | a8083063 | Iustin Pop |
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117 | a8083063 | Iustin Pop | If the device cannot be created, it will return None
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118 | a8083063 | Iustin Pop | instead. Error messages go to the logging system.
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119 | a8083063 | Iustin Pop |
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120 | a8083063 | Iustin Pop | Note that for some devices, the unique_id is used, and for other,
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121 | a8083063 | Iustin Pop | the children. The idea is that these two, taken together, are
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122 | a8083063 | Iustin Pop | enough for both creation and assembly (later).
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123 | a8083063 | Iustin Pop |
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124 | a8083063 | Iustin Pop | """
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125 | a8083063 | Iustin Pop | raise NotImplementedError |
126 | a8083063 | Iustin Pop | |
127 | a8083063 | Iustin Pop | def Remove(self): |
128 | a8083063 | Iustin Pop | """Remove this device.
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129 | a8083063 | Iustin Pop |
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130 | abdf0113 | Iustin Pop | This makes sense only for some of the device types: LV and file
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131 | abdf0113 | Iustin Pop | storeage. Also note that if the device can't attach, the removal
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132 | abdf0113 | Iustin Pop | can't be completed.
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133 | a8083063 | Iustin Pop |
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134 | a8083063 | Iustin Pop | """
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135 | a8083063 | Iustin Pop | raise NotImplementedError |
136 | a8083063 | Iustin Pop | |
137 | f3e513ad | Iustin Pop | def Rename(self, new_id): |
138 | f3e513ad | Iustin Pop | """Rename this device.
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139 | f3e513ad | Iustin Pop |
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140 | f3e513ad | Iustin Pop | This may or may not make sense for a given device type.
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141 | f3e513ad | Iustin Pop |
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142 | f3e513ad | Iustin Pop | """
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143 | f3e513ad | Iustin Pop | raise NotImplementedError |
144 | f3e513ad | Iustin Pop | |
145 | a8083063 | Iustin Pop | def Open(self, force=False): |
146 | a8083063 | Iustin Pop | """Make the device ready for use.
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147 | a8083063 | Iustin Pop |
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148 | a8083063 | Iustin Pop | This makes the device ready for I/O. For now, just the DRBD
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149 | a8083063 | Iustin Pop | devices need this.
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150 | a8083063 | Iustin Pop |
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151 | a8083063 | Iustin Pop | The force parameter signifies that if the device has any kind of
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152 | a8083063 | Iustin Pop | --force thing, it should be used, we know what we are doing.
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153 | a8083063 | Iustin Pop |
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154 | a8083063 | Iustin Pop | """
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155 | a8083063 | Iustin Pop | raise NotImplementedError |
156 | a8083063 | Iustin Pop | |
157 | a8083063 | Iustin Pop | def Shutdown(self): |
158 | a8083063 | Iustin Pop | """Shut down the device, freeing its children.
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159 | a8083063 | Iustin Pop |
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160 | a8083063 | Iustin Pop | This undoes the `Assemble()` work, except for the child
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161 | a8083063 | Iustin Pop | assembling; as such, the children on the device are still
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162 | a8083063 | Iustin Pop | assembled after this call.
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163 | a8083063 | Iustin Pop |
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164 | a8083063 | Iustin Pop | """
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165 | a8083063 | Iustin Pop | raise NotImplementedError |
166 | a8083063 | Iustin Pop | |
167 | a8083063 | Iustin Pop | def SetSyncSpeed(self, speed): |
168 | a8083063 | Iustin Pop | """Adjust the sync speed of the mirror.
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169 | a8083063 | Iustin Pop |
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170 | a8083063 | Iustin Pop | In case this is not a mirroring device, this is no-op.
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171 | a8083063 | Iustin Pop |
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172 | a8083063 | Iustin Pop | """
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173 | a8083063 | Iustin Pop | result = True
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174 | a8083063 | Iustin Pop | if self._children: |
175 | a8083063 | Iustin Pop | for child in self._children: |
176 | a8083063 | Iustin Pop | result = result and child.SetSyncSpeed(speed)
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177 | a8083063 | Iustin Pop | return result
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178 | a8083063 | Iustin Pop | |
179 | a8083063 | Iustin Pop | def GetSyncStatus(self): |
180 | a8083063 | Iustin Pop | """Returns the sync status of the device.
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181 | a8083063 | Iustin Pop |
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182 | a8083063 | Iustin Pop | If this device is a mirroring device, this function returns the
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183 | a8083063 | Iustin Pop | status of the mirror.
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184 | a8083063 | Iustin Pop |
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185 | 0834c866 | Iustin Pop | If sync_percent is None, it means the device is not syncing.
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186 | a8083063 | Iustin Pop |
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187 | a8083063 | Iustin Pop | If estimated_time is None, it means we can't estimate
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188 | 0834c866 | Iustin Pop | the time needed, otherwise it's the time left in seconds.
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189 | 0834c866 | Iustin Pop |
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190 | a8083063 | Iustin Pop | If is_degraded is True, it means the device is missing
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191 | a8083063 | Iustin Pop | redundancy. This is usually a sign that something went wrong in
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192 | a8083063 | Iustin Pop | the device setup, if sync_percent is None.
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193 | a8083063 | Iustin Pop |
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194 | 0834c866 | Iustin Pop | The ldisk parameter represents the degradation of the local
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195 | 0834c866 | Iustin Pop | data. This is only valid for some devices, the rest will always
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196 | 0834c866 | Iustin Pop | return False (not degraded).
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197 | 0834c866 | Iustin Pop |
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198 | c41eea6e | Iustin Pop | @rtype: tuple
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199 | c41eea6e | Iustin Pop | @return: (sync_percent, estimated_time, is_degraded, ldisk)
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200 | c41eea6e | Iustin Pop |
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201 | a8083063 | Iustin Pop | """
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202 | 0834c866 | Iustin Pop | return None, None, False, False |
203 | a8083063 | Iustin Pop | |
204 | a8083063 | Iustin Pop | |
205 | a8083063 | Iustin Pop | def CombinedSyncStatus(self): |
206 | a8083063 | Iustin Pop | """Calculate the mirror status recursively for our children.
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207 | a8083063 | Iustin Pop |
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208 | a8083063 | Iustin Pop | The return value is the same as for `GetSyncStatus()` except the
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209 | a8083063 | Iustin Pop | minimum percent and maximum time are calculated across our
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210 | a8083063 | Iustin Pop | children.
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211 | a8083063 | Iustin Pop |
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212 | a8083063 | Iustin Pop | """
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213 | 0834c866 | Iustin Pop | min_percent, max_time, is_degraded, ldisk = self.GetSyncStatus()
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214 | a8083063 | Iustin Pop | if self._children: |
215 | a8083063 | Iustin Pop | for child in self._children: |
216 | 0834c866 | Iustin Pop | c_percent, c_time, c_degraded, c_ldisk = child.GetSyncStatus() |
217 | a8083063 | Iustin Pop | if min_percent is None: |
218 | a8083063 | Iustin Pop | min_percent = c_percent |
219 | a8083063 | Iustin Pop | elif c_percent is not None: |
220 | a8083063 | Iustin Pop | min_percent = min(min_percent, c_percent)
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221 | a8083063 | Iustin Pop | if max_time is None: |
222 | a8083063 | Iustin Pop | max_time = c_time |
223 | a8083063 | Iustin Pop | elif c_time is not None: |
224 | a8083063 | Iustin Pop | max_time = max(max_time, c_time)
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225 | a8083063 | Iustin Pop | is_degraded = is_degraded or c_degraded
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226 | 0834c866 | Iustin Pop | ldisk = ldisk or c_ldisk
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227 | 0834c866 | Iustin Pop | return min_percent, max_time, is_degraded, ldisk
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228 | a8083063 | Iustin Pop | |
229 | a8083063 | Iustin Pop | |
230 | a0c3fea1 | Michael Hanselmann | def SetInfo(self, text): |
231 | a0c3fea1 | Michael Hanselmann | """Update metadata with info text.
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232 | a0c3fea1 | Michael Hanselmann |
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233 | a0c3fea1 | Michael Hanselmann | Only supported for some device types.
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234 | a0c3fea1 | Michael Hanselmann |
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235 | a0c3fea1 | Michael Hanselmann | """
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236 | a0c3fea1 | Michael Hanselmann | for child in self._children: |
237 | a0c3fea1 | Michael Hanselmann | child.SetInfo(text) |
238 | a0c3fea1 | Michael Hanselmann | |
239 | 1005d816 | Iustin Pop | def Grow(self, amount): |
240 | 1005d816 | Iustin Pop | """Grow the block device.
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241 | 1005d816 | Iustin Pop |
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242 | c41eea6e | Iustin Pop | @param amount: the amount (in mebibytes) to grow with
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243 | 1005d816 | Iustin Pop |
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244 | 1005d816 | Iustin Pop | """
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245 | 1005d816 | Iustin Pop | raise NotImplementedError |
246 | a0c3fea1 | Michael Hanselmann | |
247 | a8083063 | Iustin Pop | def __repr__(self): |
248 | a8083063 | Iustin Pop | return ("<%s: unique_id: %s, children: %s, %s:%s, %s>" % |
249 | a8083063 | Iustin Pop | (self.__class__, self.unique_id, self._children, |
250 | a8083063 | Iustin Pop | self.major, self.minor, self.dev_path)) |
251 | a8083063 | Iustin Pop | |
252 | a8083063 | Iustin Pop | |
253 | a8083063 | Iustin Pop | class LogicalVolume(BlockDev): |
254 | a8083063 | Iustin Pop | """Logical Volume block device.
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255 | a8083063 | Iustin Pop |
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256 | a8083063 | Iustin Pop | """
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257 | a8083063 | Iustin Pop | def __init__(self, unique_id, children): |
258 | a8083063 | Iustin Pop | """Attaches to a LV device.
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259 | a8083063 | Iustin Pop |
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260 | a8083063 | Iustin Pop | The unique_id is a tuple (vg_name, lv_name)
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261 | a8083063 | Iustin Pop |
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262 | a8083063 | Iustin Pop | """
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263 | a8083063 | Iustin Pop | super(LogicalVolume, self).__init__(unique_id, children) |
264 | a8083063 | Iustin Pop | if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
265 | a8083063 | Iustin Pop | raise ValueError("Invalid configuration data %s" % str(unique_id)) |
266 | a8083063 | Iustin Pop | self._vg_name, self._lv_name = unique_id |
267 | a8083063 | Iustin Pop | self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name) |
268 | 99e8295c | Iustin Pop | self._degraded = True |
269 | 99e8295c | Iustin Pop | self.major = self.minor = None |
270 | a8083063 | Iustin Pop | self.Attach()
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271 | a8083063 | Iustin Pop | |
272 | a8083063 | Iustin Pop | @classmethod
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273 | a8083063 | Iustin Pop | def Create(cls, unique_id, children, size): |
274 | a8083063 | Iustin Pop | """Create a new logical volume.
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275 | a8083063 | Iustin Pop |
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276 | a8083063 | Iustin Pop | """
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277 | a8083063 | Iustin Pop | if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
278 | 6c626518 | Iustin Pop | raise errors.ProgrammerError("Invalid configuration data %s" % |
279 | 6c626518 | Iustin Pop | str(unique_id))
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280 | a8083063 | Iustin Pop | vg_name, lv_name = unique_id |
281 | a8083063 | Iustin Pop | pvs_info = cls.GetPVInfo(vg_name) |
282 | a8083063 | Iustin Pop | if not pvs_info: |
283 | 3ecf6786 | Iustin Pop | raise errors.BlockDeviceError("Can't compute PV info for vg %s" % |
284 | 3ecf6786 | Iustin Pop | vg_name) |
285 | a8083063 | Iustin Pop | pvs_info.sort() |
286 | a8083063 | Iustin Pop | pvs_info.reverse() |
287 | 5b7b5d49 | Guido Trotter | |
288 | 5b7b5d49 | Guido Trotter | pvlist = [ pv[1] for pv in pvs_info ] |
289 | 5b7b5d49 | Guido Trotter | free_size = sum([ pv[0] for pv in pvs_info ]) |
290 | 5b7b5d49 | Guido Trotter | |
291 | 5b7b5d49 | Guido Trotter | # The size constraint should have been checked from the master before
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292 | 5b7b5d49 | Guido Trotter | # calling the create function.
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293 | a8083063 | Iustin Pop | if free_size < size:
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294 | 3ecf6786 | Iustin Pop | raise errors.BlockDeviceError("Not enough free space: required %s," |
295 | 3ecf6786 | Iustin Pop | " available %s" % (size, free_size))
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296 | a8083063 | Iustin Pop | result = utils.RunCmd(["lvcreate", "-L%dm" % size, "-n%s" % lv_name, |
297 | 5b7b5d49 | Guido Trotter | vg_name] + pvlist) |
298 | a8083063 | Iustin Pop | if result.failed:
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299 | 6c626518 | Iustin Pop | raise errors.BlockDeviceError("LV create failed (%s): %s" % |
300 | 6c626518 | Iustin Pop | (result.fail_reason, result.output)) |
301 | a8083063 | Iustin Pop | return LogicalVolume(unique_id, children)
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302 | a8083063 | Iustin Pop | |
303 | a8083063 | Iustin Pop | @staticmethod
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304 | a8083063 | Iustin Pop | def GetPVInfo(vg_name): |
305 | a8083063 | Iustin Pop | """Get the free space info for PVs in a volume group.
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306 | a8083063 | Iustin Pop |
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307 | c41eea6e | Iustin Pop | @param vg_name: the volume group name
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308 | a8083063 | Iustin Pop |
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309 | c41eea6e | Iustin Pop | @rtype: list
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310 | c41eea6e | Iustin Pop | @return: list of tuples (free_space, name) with free_space in mebibytes
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311 | 098c0958 | Michael Hanselmann |
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312 | a8083063 | Iustin Pop | """
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313 | a8083063 | Iustin Pop | command = ["pvs", "--noheadings", "--nosuffix", "--units=m", |
314 | a8083063 | Iustin Pop | "-opv_name,vg_name,pv_free,pv_attr", "--unbuffered", |
315 | a8083063 | Iustin Pop | "--separator=:"]
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316 | a8083063 | Iustin Pop | result = utils.RunCmd(command) |
317 | a8083063 | Iustin Pop | if result.failed:
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318 | 468c5f77 | Iustin Pop | logging.error("Can't get the PV information: %s - %s",
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319 | 468c5f77 | Iustin Pop | result.fail_reason, result.output) |
320 | a8083063 | Iustin Pop | return None |
321 | a8083063 | Iustin Pop | data = [] |
322 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
323 | a8083063 | Iustin Pop | fields = line.strip().split(':')
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324 | a8083063 | Iustin Pop | if len(fields) != 4: |
325 | 468c5f77 | Iustin Pop | logging.error("Can't parse pvs output: line '%s'", line)
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326 | a8083063 | Iustin Pop | return None |
327 | a8083063 | Iustin Pop | # skip over pvs from another vg or ones which are not allocatable
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328 | a8083063 | Iustin Pop | if fields[1] != vg_name or fields[3][0] != 'a': |
329 | a8083063 | Iustin Pop | continue
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330 | a8083063 | Iustin Pop | data.append((float(fields[2]), fields[0])) |
331 | a8083063 | Iustin Pop | |
332 | a8083063 | Iustin Pop | return data
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333 | a8083063 | Iustin Pop | |
334 | a8083063 | Iustin Pop | def Remove(self): |
335 | a8083063 | Iustin Pop | """Remove this logical volume.
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336 | a8083063 | Iustin Pop |
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337 | a8083063 | Iustin Pop | """
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338 | a8083063 | Iustin Pop | if not self.minor and not self.Attach(): |
339 | a8083063 | Iustin Pop | # the LV does not exist
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340 | a8083063 | Iustin Pop | return True |
341 | a8083063 | Iustin Pop | result = utils.RunCmd(["lvremove", "-f", "%s/%s" % |
342 | a8083063 | Iustin Pop | (self._vg_name, self._lv_name)]) |
343 | a8083063 | Iustin Pop | if result.failed:
|
344 | 468c5f77 | Iustin Pop | logging.error("Can't lvremove: %s - %s",
|
345 | 468c5f77 | Iustin Pop | result.fail_reason, result.output) |
346 | a8083063 | Iustin Pop | |
347 | a8083063 | Iustin Pop | return not result.failed |
348 | a8083063 | Iustin Pop | |
349 | f3e513ad | Iustin Pop | def Rename(self, new_id): |
350 | f3e513ad | Iustin Pop | """Rename this logical volume.
|
351 | f3e513ad | Iustin Pop |
|
352 | f3e513ad | Iustin Pop | """
|
353 | f3e513ad | Iustin Pop | if not isinstance(new_id, (tuple, list)) or len(new_id) != 2: |
354 | f3e513ad | Iustin Pop | raise errors.ProgrammerError("Invalid new logical id '%s'" % new_id) |
355 | f3e513ad | Iustin Pop | new_vg, new_name = new_id |
356 | f3e513ad | Iustin Pop | if new_vg != self._vg_name: |
357 | f3e513ad | Iustin Pop | raise errors.ProgrammerError("Can't move a logical volume across" |
358 | f3e513ad | Iustin Pop | " volume groups (from %s to to %s)" %
|
359 | f3e513ad | Iustin Pop | (self._vg_name, new_vg))
|
360 | f3e513ad | Iustin Pop | result = utils.RunCmd(["lvrename", new_vg, self._lv_name, new_name]) |
361 | f3e513ad | Iustin Pop | if result.failed:
|
362 | f3e513ad | Iustin Pop | raise errors.BlockDeviceError("Failed to rename the logical volume: %s" % |
363 | f3e513ad | Iustin Pop | result.output) |
364 | be345db0 | Iustin Pop | self._lv_name = new_name
|
365 | be345db0 | Iustin Pop | self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name) |
366 | be345db0 | Iustin Pop | |
367 | a8083063 | Iustin Pop | def Attach(self): |
368 | a8083063 | Iustin Pop | """Attach to an existing LV.
|
369 | a8083063 | Iustin Pop |
|
370 | a8083063 | Iustin Pop | This method will try to see if an existing and active LV exists
|
371 | c99a3cc0 | Manuel Franceschini | which matches our name. If so, its major/minor will be
|
372 | a8083063 | Iustin Pop | recorded.
|
373 | a8083063 | Iustin Pop |
|
374 | a8083063 | Iustin Pop | """
|
375 | cb999543 | Iustin Pop | self.attached = False |
376 | 99e8295c | Iustin Pop | result = utils.RunCmd(["lvs", "--noheadings", "--separator=,", |
377 | 99e8295c | Iustin Pop | "-olv_attr,lv_kernel_major,lv_kernel_minor",
|
378 | 99e8295c | Iustin Pop | self.dev_path])
|
379 | a8083063 | Iustin Pop | if result.failed:
|
380 | 468c5f77 | Iustin Pop | logging.error("Can't find LV %s: %s, %s",
|
381 | 468c5f77 | Iustin Pop | self.dev_path, result.fail_reason, result.output)
|
382 | a8083063 | Iustin Pop | return False |
383 | 99e8295c | Iustin Pop | out = result.stdout.strip().rstrip(',')
|
384 | 99e8295c | Iustin Pop | out = out.split(",")
|
385 | 99e8295c | Iustin Pop | if len(out) != 3: |
386 | 468c5f77 | Iustin Pop | logging.error("Can't parse LVS output, len(%s) != 3", str(out)) |
387 | 99e8295c | Iustin Pop | return False |
388 | 99e8295c | Iustin Pop | |
389 | 99e8295c | Iustin Pop | status, major, minor = out[:3]
|
390 | 99e8295c | Iustin Pop | if len(status) != 6: |
391 | 468c5f77 | Iustin Pop | logging.error("lvs lv_attr is not 6 characters (%s)", status)
|
392 | 99e8295c | Iustin Pop | return False |
393 | 99e8295c | Iustin Pop | |
394 | 99e8295c | Iustin Pop | try:
|
395 | 99e8295c | Iustin Pop | major = int(major)
|
396 | 99e8295c | Iustin Pop | minor = int(minor)
|
397 | 99e8295c | Iustin Pop | except ValueError, err: |
398 | 468c5f77 | Iustin Pop | logging.error("lvs major/minor cannot be parsed: %s", str(err)) |
399 | 99e8295c | Iustin Pop | |
400 | 99e8295c | Iustin Pop | self.major = major
|
401 | 99e8295c | Iustin Pop | self.minor = minor
|
402 | 99e8295c | Iustin Pop | self._degraded = status[0] == 'v' # virtual volume, i.e. doesn't backing |
403 | 99e8295c | Iustin Pop | # storage
|
404 | cb999543 | Iustin Pop | self.attached = True |
405 | 99e8295c | Iustin Pop | return True |
406 | a8083063 | Iustin Pop | |
407 | a8083063 | Iustin Pop | def Assemble(self): |
408 | a8083063 | Iustin Pop | """Assemble the device.
|
409 | a8083063 | Iustin Pop |
|
410 | 5574047a | Iustin Pop | We alway run `lvchange -ay` on the LV to ensure it's active before
|
411 | 5574047a | Iustin Pop | use, as there were cases when xenvg was not active after boot
|
412 | 5574047a | Iustin Pop | (also possibly after disk issues).
|
413 | a8083063 | Iustin Pop |
|
414 | a8083063 | Iustin Pop | """
|
415 | 5574047a | Iustin Pop | result = utils.RunCmd(["lvchange", "-ay", self.dev_path]) |
416 | 5574047a | Iustin Pop | if result.failed:
|
417 | 468c5f77 | Iustin Pop | logging.error("Can't activate lv %s: %s", self.dev_path, result.output) |
418 | cb999543 | Iustin Pop | return False |
419 | cb999543 | Iustin Pop | return self.Attach() |
420 | a8083063 | Iustin Pop | |
421 | a8083063 | Iustin Pop | def Shutdown(self): |
422 | a8083063 | Iustin Pop | """Shutdown the device.
|
423 | a8083063 | Iustin Pop |
|
424 | a8083063 | Iustin Pop | This is a no-op for the LV device type, as we don't deactivate the
|
425 | a8083063 | Iustin Pop | volumes on shutdown.
|
426 | a8083063 | Iustin Pop |
|
427 | a8083063 | Iustin Pop | """
|
428 | a8083063 | Iustin Pop | return True |
429 | a8083063 | Iustin Pop | |
430 | 9db6dbce | Iustin Pop | def GetSyncStatus(self): |
431 | 9db6dbce | Iustin Pop | """Returns the sync status of the device.
|
432 | 9db6dbce | Iustin Pop |
|
433 | 9db6dbce | Iustin Pop | If this device is a mirroring device, this function returns the
|
434 | 9db6dbce | Iustin Pop | status of the mirror.
|
435 | 9db6dbce | Iustin Pop |
|
436 | 9db6dbce | Iustin Pop | For logical volumes, sync_percent and estimated_time are always
|
437 | 9db6dbce | Iustin Pop | None (no recovery in progress, as we don't handle the mirrored LV
|
438 | 0834c866 | Iustin Pop | case). The is_degraded parameter is the inverse of the ldisk
|
439 | 0834c866 | Iustin Pop | parameter.
|
440 | 9db6dbce | Iustin Pop |
|
441 | 0834c866 | Iustin Pop | For the ldisk parameter, we check if the logical volume has the
|
442 | 0834c866 | Iustin Pop | 'virtual' type, which means it's not backed by existing storage
|
443 | 0834c866 | Iustin Pop | anymore (read from it return I/O error). This happens after a
|
444 | 0834c866 | Iustin Pop | physical disk failure and subsequent 'vgreduce --removemissing' on
|
445 | 0834c866 | Iustin Pop | the volume group.
|
446 | 9db6dbce | Iustin Pop |
|
447 | 99e8295c | Iustin Pop | The status was already read in Attach, so we just return it.
|
448 | 99e8295c | Iustin Pop |
|
449 | c41eea6e | Iustin Pop | @rtype: tuple
|
450 | c41eea6e | Iustin Pop | @return: (sync_percent, estimated_time, is_degraded, ldisk)
|
451 | c41eea6e | Iustin Pop |
|
452 | 9db6dbce | Iustin Pop | """
|
453 | 99e8295c | Iustin Pop | return None, None, self._degraded, self._degraded |
454 | 9db6dbce | Iustin Pop | |
455 | a8083063 | Iustin Pop | def Open(self, force=False): |
456 | a8083063 | Iustin Pop | """Make the device ready for I/O.
|
457 | a8083063 | Iustin Pop |
|
458 | a8083063 | Iustin Pop | This is a no-op for the LV device type.
|
459 | a8083063 | Iustin Pop |
|
460 | a8083063 | Iustin Pop | """
|
461 | fdbd668d | Iustin Pop | pass
|
462 | a8083063 | Iustin Pop | |
463 | a8083063 | Iustin Pop | def Close(self): |
464 | a8083063 | Iustin Pop | """Notifies that the device will no longer be used for I/O.
|
465 | a8083063 | Iustin Pop |
|
466 | a8083063 | Iustin Pop | This is a no-op for the LV device type.
|
467 | a8083063 | Iustin Pop |
|
468 | a8083063 | Iustin Pop | """
|
469 | fdbd668d | Iustin Pop | pass
|
470 | a8083063 | Iustin Pop | |
471 | a8083063 | Iustin Pop | def Snapshot(self, size): |
472 | a8083063 | Iustin Pop | """Create a snapshot copy of an lvm block device.
|
473 | a8083063 | Iustin Pop |
|
474 | a8083063 | Iustin Pop | """
|
475 | a8083063 | Iustin Pop | snap_name = self._lv_name + ".snap" |
476 | a8083063 | Iustin Pop | |
477 | a8083063 | Iustin Pop | # remove existing snapshot if found
|
478 | a8083063 | Iustin Pop | snap = LogicalVolume((self._vg_name, snap_name), None) |
479 | a8083063 | Iustin Pop | snap.Remove() |
480 | a8083063 | Iustin Pop | |
481 | a8083063 | Iustin Pop | pvs_info = self.GetPVInfo(self._vg_name) |
482 | a8083063 | Iustin Pop | if not pvs_info: |
483 | 3ecf6786 | Iustin Pop | raise errors.BlockDeviceError("Can't compute PV info for vg %s" % |
484 | 3ecf6786 | Iustin Pop | self._vg_name)
|
485 | a8083063 | Iustin Pop | pvs_info.sort() |
486 | a8083063 | Iustin Pop | pvs_info.reverse() |
487 | a8083063 | Iustin Pop | free_size, pv_name = pvs_info[0]
|
488 | a8083063 | Iustin Pop | if free_size < size:
|
489 | 3ecf6786 | Iustin Pop | raise errors.BlockDeviceError("Not enough free space: required %s," |
490 | 3ecf6786 | Iustin Pop | " available %s" % (size, free_size))
|
491 | a8083063 | Iustin Pop | |
492 | a8083063 | Iustin Pop | result = utils.RunCmd(["lvcreate", "-L%dm" % size, "-s", |
493 | a8083063 | Iustin Pop | "-n%s" % snap_name, self.dev_path]) |
494 | a8083063 | Iustin Pop | if result.failed:
|
495 | 6c896e2f | Iustin Pop | raise errors.BlockDeviceError("command: %s error: %s - %s" % |
496 | 6c896e2f | Iustin Pop | (result.cmd, result.fail_reason, |
497 | 6c896e2f | Iustin Pop | result.output)) |
498 | a8083063 | Iustin Pop | |
499 | a8083063 | Iustin Pop | return snap_name
|
500 | a8083063 | Iustin Pop | |
501 | a0c3fea1 | Michael Hanselmann | def SetInfo(self, text): |
502 | a0c3fea1 | Michael Hanselmann | """Update metadata with info text.
|
503 | a0c3fea1 | Michael Hanselmann |
|
504 | a0c3fea1 | Michael Hanselmann | """
|
505 | a0c3fea1 | Michael Hanselmann | BlockDev.SetInfo(self, text)
|
506 | a0c3fea1 | Michael Hanselmann | |
507 | a0c3fea1 | Michael Hanselmann | # Replace invalid characters
|
508 | a0c3fea1 | Michael Hanselmann | text = re.sub('^[^A-Za-z0-9_+.]', '_', text) |
509 | a0c3fea1 | Michael Hanselmann | text = re.sub('[^-A-Za-z0-9_+.]', '_', text) |
510 | a0c3fea1 | Michael Hanselmann | |
511 | a0c3fea1 | Michael Hanselmann | # Only up to 128 characters are allowed
|
512 | a0c3fea1 | Michael Hanselmann | text = text[:128]
|
513 | a0c3fea1 | Michael Hanselmann | |
514 | a0c3fea1 | Michael Hanselmann | result = utils.RunCmd(["lvchange", "--addtag", text, |
515 | a0c3fea1 | Michael Hanselmann | self.dev_path])
|
516 | a0c3fea1 | Michael Hanselmann | if result.failed:
|
517 | 6c896e2f | Iustin Pop | raise errors.BlockDeviceError("Command: %s error: %s - %s" % |
518 | 6c896e2f | Iustin Pop | (result.cmd, result.fail_reason, |
519 | 6c896e2f | Iustin Pop | result.output)) |
520 | 1005d816 | Iustin Pop | def Grow(self, amount): |
521 | 1005d816 | Iustin Pop | """Grow the logical volume.
|
522 | 1005d816 | Iustin Pop |
|
523 | 1005d816 | Iustin Pop | """
|
524 | 1005d816 | Iustin Pop | # we try multiple algorithms since the 'best' ones might not have
|
525 | 1005d816 | Iustin Pop | # space available in the right place, but later ones might (since
|
526 | 1005d816 | Iustin Pop | # they have less constraints); also note that only recent LVM
|
527 | 1005d816 | Iustin Pop | # supports 'cling'
|
528 | 1005d816 | Iustin Pop | for alloc_policy in "contiguous", "cling", "normal": |
529 | 1005d816 | Iustin Pop | result = utils.RunCmd(["lvextend", "--alloc", alloc_policy, |
530 | 1005d816 | Iustin Pop | "-L", "+%dm" % amount, self.dev_path]) |
531 | 1005d816 | Iustin Pop | if not result.failed: |
532 | 1005d816 | Iustin Pop | return
|
533 | 1005d816 | Iustin Pop | raise errors.BlockDeviceError("Can't grow LV %s: %s" % |
534 | 1005d816 | Iustin Pop | (self.dev_path, result.output))
|
535 | a0c3fea1 | Michael Hanselmann | |
536 | a0c3fea1 | Michael Hanselmann | |
537 | 6b90c22e | Iustin Pop | class DRBD8Status(object): |
538 | 6b90c22e | Iustin Pop | """A DRBD status representation class.
|
539 | 6b90c22e | Iustin Pop |
|
540 | 6b90c22e | Iustin Pop | Note that this doesn't support unconfigured devices (cs:Unconfigured).
|
541 | 6b90c22e | Iustin Pop |
|
542 | 6b90c22e | Iustin Pop | """
|
543 | 767d52d3 | Iustin Pop | UNCONF_RE = re.compile(r"\s*[0-9]+:\s*cs:Unconfigured$")
|
544 | 6b90c22e | Iustin Pop | LINE_RE = re.compile(r"\s*[0-9]+:\s*cs:(\S+)\s+st:([^/]+)/(\S+)"
|
545 | 6b90c22e | Iustin Pop | "\s+ds:([^/]+)/(\S+)\s+.*$")
|
546 | 6b90c22e | Iustin Pop | SYNC_RE = re.compile(r"^.*\ssync'ed:\s*([0-9.]+)%.*"
|
547 | 6b90c22e | Iustin Pop | "\sfinish: ([0-9]+):([0-9]+):([0-9]+)\s.*$")
|
548 | 6b90c22e | Iustin Pop | |
549 | 6b90c22e | Iustin Pop | def __init__(self, procline): |
550 | 767d52d3 | Iustin Pop | u = self.UNCONF_RE.match(procline)
|
551 | 767d52d3 | Iustin Pop | if u:
|
552 | 767d52d3 | Iustin Pop | self.cstatus = "Unconfigured" |
553 | 767d52d3 | Iustin Pop | self.lrole = self.rrole = self.ldisk = self.rdisk = None |
554 | 767d52d3 | Iustin Pop | else:
|
555 | 767d52d3 | Iustin Pop | m = self.LINE_RE.match(procline)
|
556 | 767d52d3 | Iustin Pop | if not m: |
557 | 767d52d3 | Iustin Pop | raise errors.BlockDeviceError("Can't parse input data '%s'" % procline) |
558 | 767d52d3 | Iustin Pop | self.cstatus = m.group(1) |
559 | 767d52d3 | Iustin Pop | self.lrole = m.group(2) |
560 | 767d52d3 | Iustin Pop | self.rrole = m.group(3) |
561 | 767d52d3 | Iustin Pop | self.ldisk = m.group(4) |
562 | 767d52d3 | Iustin Pop | self.rdisk = m.group(5) |
563 | 767d52d3 | Iustin Pop | |
564 | 767d52d3 | Iustin Pop | # end reading of data from the LINE_RE or UNCONF_RE
|
565 | 6b90c22e | Iustin Pop | |
566 | 6b90c22e | Iustin Pop | self.is_standalone = self.cstatus == "StandAlone" |
567 | 6b90c22e | Iustin Pop | self.is_wfconn = self.cstatus == "WFConnection" |
568 | 6b90c22e | Iustin Pop | self.is_connected = self.cstatus == "Connected" |
569 | 6b90c22e | Iustin Pop | self.is_primary = self.lrole == "Primary" |
570 | 6b90c22e | Iustin Pop | self.is_secondary = self.lrole == "Secondary" |
571 | 6b90c22e | Iustin Pop | self.peer_primary = self.rrole == "Primary" |
572 | 6b90c22e | Iustin Pop | self.peer_secondary = self.rrole == "Secondary" |
573 | 6b90c22e | Iustin Pop | self.both_primary = self.is_primary and self.peer_primary |
574 | 6b90c22e | Iustin Pop | self.both_secondary = self.is_secondary and self.peer_secondary |
575 | 6b90c22e | Iustin Pop | |
576 | 6b90c22e | Iustin Pop | self.is_diskless = self.ldisk == "Diskless" |
577 | 6b90c22e | Iustin Pop | self.is_disk_uptodate = self.ldisk == "UpToDate" |
578 | 6b90c22e | Iustin Pop | |
579 | 767d52d3 | Iustin Pop | self.is_in_resync = self.cstatus in ("SyncSource", "SyncTarget") |
580 | 767d52d3 | Iustin Pop | self.is_in_use = self.cstatus != "Unconfigured" |
581 | 6b93ec9d | Iustin Pop | |
582 | 6b90c22e | Iustin Pop | m = self.SYNC_RE.match(procline)
|
583 | 6b90c22e | Iustin Pop | if m:
|
584 | 6b90c22e | Iustin Pop | self.sync_percent = float(m.group(1)) |
585 | 6b90c22e | Iustin Pop | hours = int(m.group(2)) |
586 | 6b90c22e | Iustin Pop | minutes = int(m.group(3)) |
587 | 6b90c22e | Iustin Pop | seconds = int(m.group(4)) |
588 | 6b90c22e | Iustin Pop | self.est_time = hours * 3600 + minutes * 60 + seconds |
589 | 6b90c22e | Iustin Pop | else:
|
590 | 6b90c22e | Iustin Pop | self.sync_percent = None |
591 | 6b90c22e | Iustin Pop | self.est_time = None |
592 | 6b90c22e | Iustin Pop | |
593 | 6b90c22e | Iustin Pop | self.is_sync_target = self.peer_sync_source = self.cstatus == "SyncTarget" |
594 | 6b90c22e | Iustin Pop | self.peer_sync_target = self.is_sync_source = self.cstatus == "SyncSource" |
595 | 6b90c22e | Iustin Pop | self.is_resync = self.is_sync_target or self.is_sync_source |
596 | 6b90c22e | Iustin Pop | |
597 | 6b90c22e | Iustin Pop | |
598 | 0f7f32d9 | Iustin Pop | class BaseDRBD(BlockDev): |
599 | 0f7f32d9 | Iustin Pop | """Base DRBD class.
|
600 | a8083063 | Iustin Pop |
|
601 | 0f7f32d9 | Iustin Pop | This class contains a few bits of common functionality between the
|
602 | 0f7f32d9 | Iustin Pop | 0.7 and 8.x versions of DRBD.
|
603 | 0f7f32d9 | Iustin Pop |
|
604 | abdf0113 | Iustin Pop | """
|
605 | abdf0113 | Iustin Pop | _VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)"
|
606 | abdf0113 | Iustin Pop | r" \(api:(\d+)/proto:(\d+)(?:-(\d+))?\)")
|
607 | a8083063 | Iustin Pop | |
608 | abdf0113 | Iustin Pop | _DRBD_MAJOR = 147
|
609 | abdf0113 | Iustin Pop | _ST_UNCONFIGURED = "Unconfigured"
|
610 | abdf0113 | Iustin Pop | _ST_WFCONNECTION = "WFConnection"
|
611 | abdf0113 | Iustin Pop | _ST_CONNECTED = "Connected"
|
612 | a8083063 | Iustin Pop | |
613 | 6b90c22e | Iustin Pop | _STATUS_FILE = "/proc/drbd"
|
614 | 6b90c22e | Iustin Pop | |
615 | abdf0113 | Iustin Pop | @staticmethod
|
616 | 6b90c22e | Iustin Pop | def _GetProcData(filename=_STATUS_FILE): |
617 | abdf0113 | Iustin Pop | """Return data from /proc/drbd.
|
618 | a8083063 | Iustin Pop |
|
619 | a8083063 | Iustin Pop | """
|
620 | 6b90c22e | Iustin Pop | stat = open(filename, "r") |
621 | abdf0113 | Iustin Pop | try:
|
622 | abdf0113 | Iustin Pop | data = stat.read().splitlines() |
623 | abdf0113 | Iustin Pop | finally:
|
624 | abdf0113 | Iustin Pop | stat.close() |
625 | abdf0113 | Iustin Pop | if not data: |
626 | 6b90c22e | Iustin Pop | raise errors.BlockDeviceError("Can't read any data from %s" % filename) |
627 | abdf0113 | Iustin Pop | return data
|
628 | a8083063 | Iustin Pop | |
629 | abdf0113 | Iustin Pop | @staticmethod
|
630 | abdf0113 | Iustin Pop | def _MassageProcData(data): |
631 | abdf0113 | Iustin Pop | """Transform the output of _GetProdData into a nicer form.
|
632 | a8083063 | Iustin Pop |
|
633 | c41eea6e | Iustin Pop | @return: a dictionary of minor: joined lines from /proc/drbd
|
634 | c41eea6e | Iustin Pop | for that minor
|
635 | a8083063 | Iustin Pop |
|
636 | a8083063 | Iustin Pop | """
|
637 | abdf0113 | Iustin Pop | lmatch = re.compile("^ *([0-9]+):.*$")
|
638 | abdf0113 | Iustin Pop | results = {} |
639 | abdf0113 | Iustin Pop | old_minor = old_line = None
|
640 | abdf0113 | Iustin Pop | for line in data: |
641 | abdf0113 | Iustin Pop | lresult = lmatch.match(line) |
642 | abdf0113 | Iustin Pop | if lresult is not None: |
643 | abdf0113 | Iustin Pop | if old_minor is not None: |
644 | abdf0113 | Iustin Pop | results[old_minor] = old_line |
645 | abdf0113 | Iustin Pop | old_minor = int(lresult.group(1)) |
646 | abdf0113 | Iustin Pop | old_line = line |
647 | abdf0113 | Iustin Pop | else:
|
648 | abdf0113 | Iustin Pop | if old_minor is not None: |
649 | abdf0113 | Iustin Pop | old_line += " " + line.strip()
|
650 | abdf0113 | Iustin Pop | # add last line
|
651 | abdf0113 | Iustin Pop | if old_minor is not None: |
652 | abdf0113 | Iustin Pop | results[old_minor] = old_line |
653 | abdf0113 | Iustin Pop | return results
|
654 | a8083063 | Iustin Pop | |
655 | abdf0113 | Iustin Pop | @classmethod
|
656 | abdf0113 | Iustin Pop | def _GetVersion(cls): |
657 | abdf0113 | Iustin Pop | """Return the DRBD version.
|
658 | a8083063 | Iustin Pop |
|
659 | abdf0113 | Iustin Pop | This will return a dict with keys:
|
660 | c41eea6e | Iustin Pop | - k_major
|
661 | c41eea6e | Iustin Pop | - k_minor
|
662 | c41eea6e | Iustin Pop | - k_point
|
663 | c41eea6e | Iustin Pop | - api
|
664 | c41eea6e | Iustin Pop | - proto
|
665 | c41eea6e | Iustin Pop | - proto2 (only on drbd > 8.2.X)
|
666 | a8083063 | Iustin Pop |
|
667 | a8083063 | Iustin Pop | """
|
668 | abdf0113 | Iustin Pop | proc_data = cls._GetProcData() |
669 | abdf0113 | Iustin Pop | first_line = proc_data[0].strip()
|
670 | abdf0113 | Iustin Pop | version = cls._VERSION_RE.match(first_line) |
671 | abdf0113 | Iustin Pop | if not version: |
672 | abdf0113 | Iustin Pop | raise errors.BlockDeviceError("Can't parse DRBD version from '%s'" % |
673 | abdf0113 | Iustin Pop | first_line) |
674 | a8083063 | Iustin Pop | |
675 | abdf0113 | Iustin Pop | values = version.groups() |
676 | abdf0113 | Iustin Pop | retval = {'k_major': int(values[0]), |
677 | abdf0113 | Iustin Pop | 'k_minor': int(values[1]), |
678 | abdf0113 | Iustin Pop | 'k_point': int(values[2]), |
679 | abdf0113 | Iustin Pop | 'api': int(values[3]), |
680 | abdf0113 | Iustin Pop | 'proto': int(values[4]), |
681 | abdf0113 | Iustin Pop | } |
682 | abdf0113 | Iustin Pop | if values[5] is not None: |
683 | abdf0113 | Iustin Pop | retval['proto2'] = values[5] |
684 | a8083063 | Iustin Pop | |
685 | abdf0113 | Iustin Pop | return retval
|
686 | abdf0113 | Iustin Pop | |
687 | abdf0113 | Iustin Pop | @staticmethod
|
688 | abdf0113 | Iustin Pop | def _DevPath(minor): |
689 | abdf0113 | Iustin Pop | """Return the path to a drbd device for a given minor.
|
690 | a8083063 | Iustin Pop |
|
691 | a8083063 | Iustin Pop | """
|
692 | abdf0113 | Iustin Pop | return "/dev/drbd%d" % minor |
693 | a8083063 | Iustin Pop | |
694 | abdf0113 | Iustin Pop | @classmethod
|
695 | 6d2e83d5 | Iustin Pop | def GetUsedDevs(cls): |
696 | abdf0113 | Iustin Pop | """Compute the list of used DRBD devices.
|
697 | a8083063 | Iustin Pop |
|
698 | a8083063 | Iustin Pop | """
|
699 | abdf0113 | Iustin Pop | data = cls._GetProcData() |
700 | a8083063 | Iustin Pop | |
701 | abdf0113 | Iustin Pop | used_devs = {} |
702 | abdf0113 | Iustin Pop | valid_line = re.compile("^ *([0-9]+): cs:([^ ]+).*$")
|
703 | abdf0113 | Iustin Pop | for line in data: |
704 | abdf0113 | Iustin Pop | match = valid_line.match(line) |
705 | abdf0113 | Iustin Pop | if not match: |
706 | abdf0113 | Iustin Pop | continue
|
707 | abdf0113 | Iustin Pop | minor = int(match.group(1)) |
708 | abdf0113 | Iustin Pop | state = match.group(2)
|
709 | abdf0113 | Iustin Pop | if state == cls._ST_UNCONFIGURED:
|
710 | abdf0113 | Iustin Pop | continue
|
711 | abdf0113 | Iustin Pop | used_devs[minor] = state, line |
712 | a8083063 | Iustin Pop | |
713 | abdf0113 | Iustin Pop | return used_devs
|
714 | a8083063 | Iustin Pop | |
715 | abdf0113 | Iustin Pop | def _SetFromMinor(self, minor): |
716 | abdf0113 | Iustin Pop | """Set our parameters based on the given minor.
|
717 | 0834c866 | Iustin Pop |
|
718 | abdf0113 | Iustin Pop | This sets our minor variable and our dev_path.
|
719 | a8083063 | Iustin Pop |
|
720 | a8083063 | Iustin Pop | """
|
721 | abdf0113 | Iustin Pop | if minor is None: |
722 | abdf0113 | Iustin Pop | self.minor = self.dev_path = None |
723 | cb999543 | Iustin Pop | self.attached = False |
724 | a8083063 | Iustin Pop | else:
|
725 | abdf0113 | Iustin Pop | self.minor = minor
|
726 | abdf0113 | Iustin Pop | self.dev_path = self._DevPath(minor) |
727 | cb999543 | Iustin Pop | self.attached = True |
728 | a8083063 | Iustin Pop | |
729 | a8083063 | Iustin Pop | @staticmethod
|
730 | abdf0113 | Iustin Pop | def _CheckMetaSize(meta_device): |
731 | abdf0113 | Iustin Pop | """Check if the given meta device looks like a valid one.
|
732 | a8083063 | Iustin Pop |
|
733 | abdf0113 | Iustin Pop | This currently only check the size, which must be around
|
734 | abdf0113 | Iustin Pop | 128MiB.
|
735 | a8083063 | Iustin Pop |
|
736 | a8083063 | Iustin Pop | """
|
737 | abdf0113 | Iustin Pop | result = utils.RunCmd(["blockdev", "--getsize", meta_device]) |
738 | abdf0113 | Iustin Pop | if result.failed:
|
739 | 468c5f77 | Iustin Pop | logging.error("Failed to get device size: %s - %s",
|
740 | 468c5f77 | Iustin Pop | result.fail_reason, result.output) |
741 | abdf0113 | Iustin Pop | return False |
742 | a8083063 | Iustin Pop | try:
|
743 | abdf0113 | Iustin Pop | sectors = int(result.stdout)
|
744 | abdf0113 | Iustin Pop | except ValueError: |
745 | 468c5f77 | Iustin Pop | logging.error("Invalid output from blockdev: '%s'", result.stdout)
|
746 | abdf0113 | Iustin Pop | return False |
747 | abdf0113 | Iustin Pop | bytes = sectors * 512
|
748 | abdf0113 | Iustin Pop | if bytes < 128 * 1024 * 1024: # less than 128MiB |
749 | 468c5f77 | Iustin Pop | logging.error("Meta device too small (%.2fMib)", (bytes / 1024 / 1024)) |
750 | abdf0113 | Iustin Pop | return False |
751 | abdf0113 | Iustin Pop | if bytes > (128 + 32) * 1024 * 1024: # account for an extra (big) PE on LVM |
752 | 468c5f77 | Iustin Pop | logging.error("Meta device too big (%.2fMiB)", (bytes / 1024 / 1024)) |
753 | abdf0113 | Iustin Pop | return False |
754 | abdf0113 | Iustin Pop | return True |
755 | a8083063 | Iustin Pop | |
756 | abdf0113 | Iustin Pop | def Rename(self, new_id): |
757 | abdf0113 | Iustin Pop | """Rename a device.
|
758 | a8083063 | Iustin Pop |
|
759 | abdf0113 | Iustin Pop | This is not supported for drbd devices.
|
760 | a8083063 | Iustin Pop |
|
761 | a8083063 | Iustin Pop | """
|
762 | abdf0113 | Iustin Pop | raise errors.ProgrammerError("Can't rename a drbd device") |
763 | a8083063 | Iustin Pop | |
764 | f3e513ad | Iustin Pop | |
765 | a2cfdea2 | Iustin Pop | class DRBD8(BaseDRBD): |
766 | a2cfdea2 | Iustin Pop | """DRBD v8.x block device.
|
767 | a2cfdea2 | Iustin Pop |
|
768 | a2cfdea2 | Iustin Pop | This implements the local host part of the DRBD device, i.e. it
|
769 | a2cfdea2 | Iustin Pop | doesn't do anything to the supposed peer. If you need a fully
|
770 | a2cfdea2 | Iustin Pop | connected DRBD pair, you need to use this class on both hosts.
|
771 | a2cfdea2 | Iustin Pop |
|
772 | a2cfdea2 | Iustin Pop | The unique_id for the drbd device is the (local_ip, local_port,
|
773 | a2cfdea2 | Iustin Pop | remote_ip, remote_port) tuple, and it must have two children: the
|
774 | a2cfdea2 | Iustin Pop | data device and the meta_device. The meta device is checked for
|
775 | a2cfdea2 | Iustin Pop | valid size and is zeroed on create.
|
776 | a2cfdea2 | Iustin Pop |
|
777 | a2cfdea2 | Iustin Pop | """
|
778 | a2cfdea2 | Iustin Pop | _MAX_MINORS = 255
|
779 | a2cfdea2 | Iustin Pop | _PARSE_SHOW = None
|
780 | a2cfdea2 | Iustin Pop | |
781 | cf8df3f3 | Iustin Pop | # timeout constants
|
782 | cf8df3f3 | Iustin Pop | _NET_RECONFIG_TIMEOUT = 60
|
783 | cf8df3f3 | Iustin Pop | |
784 | a2cfdea2 | Iustin Pop | def __init__(self, unique_id, children): |
785 | fc1dc9d7 | Iustin Pop | if children and children.count(None) > 0: |
786 | fc1dc9d7 | Iustin Pop | children = [] |
787 | a2cfdea2 | Iustin Pop | super(DRBD8, self).__init__(unique_id, children) |
788 | a2cfdea2 | Iustin Pop | self.major = self._DRBD_MAJOR |
789 | c3f9340c | Guido Trotter | version = self._GetVersion()
|
790 | c3f9340c | Guido Trotter | if version['k_major'] != 8 : |
791 | a2cfdea2 | Iustin Pop | raise errors.BlockDeviceError("Mismatch in DRBD kernel version and" |
792 | a2cfdea2 | Iustin Pop | " requested ganeti usage: kernel is"
|
793 | c3f9340c | Guido Trotter | " %s.%s, ganeti wants 8.x" %
|
794 | c3f9340c | Guido Trotter | (version['k_major'], version['k_minor'])) |
795 | a2cfdea2 | Iustin Pop | |
796 | b00b95dd | Iustin Pop | if len(children) not in (0, 2): |
797 | a2cfdea2 | Iustin Pop | raise ValueError("Invalid configuration data %s" % str(children)) |
798 | f9518d38 | Iustin Pop | if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 6: |
799 | a2cfdea2 | Iustin Pop | raise ValueError("Invalid configuration data %s" % str(unique_id)) |
800 | ffa1c0dc | Iustin Pop | (self._lhost, self._lport, |
801 | ffa1c0dc | Iustin Pop | self._rhost, self._rport, |
802 | f9518d38 | Iustin Pop | self._aminor, self._secret) = unique_id |
803 | ffa1c0dc | Iustin Pop | if (self._lhost is not None and self._lhost == self._rhost and |
804 | ffa1c0dc | Iustin Pop | self._lport == self._rport): |
805 | ffa1c0dc | Iustin Pop | raise ValueError("Invalid configuration data, same local/remote %s" % |
806 | ffa1c0dc | Iustin Pop | (unique_id,)) |
807 | a2cfdea2 | Iustin Pop | self.Attach()
|
808 | a2cfdea2 | Iustin Pop | |
809 | a2cfdea2 | Iustin Pop | @classmethod
|
810 | a2cfdea2 | Iustin Pop | def _InitMeta(cls, minor, dev_path): |
811 | a2cfdea2 | Iustin Pop | """Initialize a meta device.
|
812 | a2cfdea2 | Iustin Pop |
|
813 | a2cfdea2 | Iustin Pop | This will not work if the given minor is in use.
|
814 | a2cfdea2 | Iustin Pop |
|
815 | a2cfdea2 | Iustin Pop | """
|
816 | a2cfdea2 | Iustin Pop | result = utils.RunCmd(["drbdmeta", "--force", cls._DevPath(minor), |
817 | a2cfdea2 | Iustin Pop | "v08", dev_path, "0", "create-md"]) |
818 | a2cfdea2 | Iustin Pop | if result.failed:
|
819 | a2cfdea2 | Iustin Pop | raise errors.BlockDeviceError("Can't initialize meta device: %s" % |
820 | a2cfdea2 | Iustin Pop | result.output) |
821 | a2cfdea2 | Iustin Pop | |
822 | a2cfdea2 | Iustin Pop | @classmethod
|
823 | a2cfdea2 | Iustin Pop | def _FindUnusedMinor(cls): |
824 | a2cfdea2 | Iustin Pop | """Find an unused DRBD device.
|
825 | a2cfdea2 | Iustin Pop |
|
826 | a2cfdea2 | Iustin Pop | This is specific to 8.x as the minors are allocated dynamically,
|
827 | a2cfdea2 | Iustin Pop | so non-existing numbers up to a max minor count are actually free.
|
828 | a2cfdea2 | Iustin Pop |
|
829 | a2cfdea2 | Iustin Pop | """
|
830 | a2cfdea2 | Iustin Pop | data = cls._GetProcData() |
831 | a2cfdea2 | Iustin Pop | |
832 | a2cfdea2 | Iustin Pop | unused_line = re.compile("^ *([0-9]+): cs:Unconfigured$")
|
833 | a2cfdea2 | Iustin Pop | used_line = re.compile("^ *([0-9]+): cs:")
|
834 | a2cfdea2 | Iustin Pop | highest = None
|
835 | a2cfdea2 | Iustin Pop | for line in data: |
836 | a2cfdea2 | Iustin Pop | match = unused_line.match(line) |
837 | a2cfdea2 | Iustin Pop | if match:
|
838 | a2cfdea2 | Iustin Pop | return int(match.group(1)) |
839 | a2cfdea2 | Iustin Pop | match = used_line.match(line) |
840 | a2cfdea2 | Iustin Pop | if match:
|
841 | a2cfdea2 | Iustin Pop | minor = int(match.group(1)) |
842 | a2cfdea2 | Iustin Pop | highest = max(highest, minor)
|
843 | a2cfdea2 | Iustin Pop | if highest is None: # there are no minors in use at all |
844 | a2cfdea2 | Iustin Pop | return 0 |
845 | a2cfdea2 | Iustin Pop | if highest >= cls._MAX_MINORS:
|
846 | 468c5f77 | Iustin Pop | logging.error("Error: no free drbd minors!")
|
847 | a2cfdea2 | Iustin Pop | raise errors.BlockDeviceError("Can't find a free DRBD minor") |
848 | a2cfdea2 | Iustin Pop | return highest + 1 |
849 | a2cfdea2 | Iustin Pop | |
850 | a2cfdea2 | Iustin Pop | @classmethod
|
851 | a2cfdea2 | Iustin Pop | def _GetShowParser(cls): |
852 | a2cfdea2 | Iustin Pop | """Return a parser for `drbd show` output.
|
853 | a2cfdea2 | Iustin Pop |
|
854 | a2cfdea2 | Iustin Pop | This will either create or return an already-create parser for the
|
855 | a2cfdea2 | Iustin Pop | output of the command `drbd show`.
|
856 | a2cfdea2 | Iustin Pop |
|
857 | a2cfdea2 | Iustin Pop | """
|
858 | a2cfdea2 | Iustin Pop | if cls._PARSE_SHOW is not None: |
859 | a2cfdea2 | Iustin Pop | return cls._PARSE_SHOW
|
860 | a2cfdea2 | Iustin Pop | |
861 | a2cfdea2 | Iustin Pop | # pyparsing setup
|
862 | a2cfdea2 | Iustin Pop | lbrace = pyp.Literal("{").suppress()
|
863 | a2cfdea2 | Iustin Pop | rbrace = pyp.Literal("}").suppress()
|
864 | a2cfdea2 | Iustin Pop | semi = pyp.Literal(";").suppress()
|
865 | a2cfdea2 | Iustin Pop | # this also converts the value to an int
|
866 | c522ea02 | Iustin Pop | number = pyp.Word(pyp.nums).setParseAction(lambda s, l, t: int(t[0])) |
867 | a2cfdea2 | Iustin Pop | |
868 | a2cfdea2 | Iustin Pop | comment = pyp.Literal ("#") + pyp.Optional(pyp.restOfLine)
|
869 | a2cfdea2 | Iustin Pop | defa = pyp.Literal("_is_default").suppress()
|
870 | a2cfdea2 | Iustin Pop | dbl_quote = pyp.Literal('"').suppress()
|
871 | a2cfdea2 | Iustin Pop | |
872 | a2cfdea2 | Iustin Pop | keyword = pyp.Word(pyp.alphanums + '-')
|
873 | a2cfdea2 | Iustin Pop | |
874 | a2cfdea2 | Iustin Pop | # value types
|
875 | a2cfdea2 | Iustin Pop | value = pyp.Word(pyp.alphanums + '_-/.:')
|
876 | a2cfdea2 | Iustin Pop | quoted = dbl_quote + pyp.CharsNotIn('"') + dbl_quote
|
877 | a2cfdea2 | Iustin Pop | addr_port = (pyp.Word(pyp.nums + '.') + pyp.Literal(':').suppress() + |
878 | a2cfdea2 | Iustin Pop | number) |
879 | a2cfdea2 | Iustin Pop | # meta device, extended syntax
|
880 | a2cfdea2 | Iustin Pop | meta_value = ((value ^ quoted) + pyp.Literal('[').suppress() +
|
881 | a2cfdea2 | Iustin Pop | number + pyp.Word(']').suppress())
|
882 | a2cfdea2 | Iustin Pop | |
883 | a2cfdea2 | Iustin Pop | # a statement
|
884 | a2cfdea2 | Iustin Pop | stmt = (~rbrace + keyword + ~lbrace + |
885 | 63012024 | Guido Trotter | pyp.Optional(addr_port ^ value ^ quoted ^ meta_value) + |
886 | a2cfdea2 | Iustin Pop | pyp.Optional(defa) + semi + |
887 | a2cfdea2 | Iustin Pop | pyp.Optional(pyp.restOfLine).suppress()) |
888 | a2cfdea2 | Iustin Pop | |
889 | a2cfdea2 | Iustin Pop | # an entire section
|
890 | a2cfdea2 | Iustin Pop | section_name = pyp.Word(pyp.alphas + '_')
|
891 | a2cfdea2 | Iustin Pop | section = section_name + lbrace + pyp.ZeroOrMore(pyp.Group(stmt)) + rbrace |
892 | a2cfdea2 | Iustin Pop | |
893 | a2cfdea2 | Iustin Pop | bnf = pyp.ZeroOrMore(pyp.Group(section ^ stmt)) |
894 | a2cfdea2 | Iustin Pop | bnf.ignore(comment) |
895 | a2cfdea2 | Iustin Pop | |
896 | a2cfdea2 | Iustin Pop | cls._PARSE_SHOW = bnf |
897 | a2cfdea2 | Iustin Pop | |
898 | a2cfdea2 | Iustin Pop | return bnf
|
899 | a2cfdea2 | Iustin Pop | |
900 | a2cfdea2 | Iustin Pop | @classmethod
|
901 | 3840729d | Iustin Pop | def _GetShowData(cls, minor): |
902 | 3840729d | Iustin Pop | """Return the `drbdsetup show` data for a minor.
|
903 | a2cfdea2 | Iustin Pop |
|
904 | a2cfdea2 | Iustin Pop | """
|
905 | a2cfdea2 | Iustin Pop | result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"]) |
906 | a2cfdea2 | Iustin Pop | if result.failed:
|
907 | 468c5f77 | Iustin Pop | logging.error("Can't display the drbd config: %s - %s",
|
908 | 468c5f77 | Iustin Pop | result.fail_reason, result.output) |
909 | 3840729d | Iustin Pop | return None |
910 | 3840729d | Iustin Pop | return result.stdout
|
911 | 3840729d | Iustin Pop | |
912 | 3840729d | Iustin Pop | @classmethod
|
913 | 3840729d | Iustin Pop | def _GetDevInfo(cls, out): |
914 | 3840729d | Iustin Pop | """Parse details about a given DRBD minor.
|
915 | 3840729d | Iustin Pop |
|
916 | 3840729d | Iustin Pop | This return, if available, the local backing device (as a path)
|
917 | 3840729d | Iustin Pop | and the local and remote (ip, port) information from a string
|
918 | 3840729d | Iustin Pop | containing the output of the `drbdsetup show` command as returned
|
919 | 3840729d | Iustin Pop | by _GetShowData.
|
920 | 3840729d | Iustin Pop |
|
921 | 3840729d | Iustin Pop | """
|
922 | 3840729d | Iustin Pop | data = {} |
923 | a2cfdea2 | Iustin Pop | if not out: |
924 | a2cfdea2 | Iustin Pop | return data
|
925 | a2cfdea2 | Iustin Pop | |
926 | a2cfdea2 | Iustin Pop | bnf = cls._GetShowParser() |
927 | a2cfdea2 | Iustin Pop | # run pyparse
|
928 | a2cfdea2 | Iustin Pop | |
929 | a2cfdea2 | Iustin Pop | try:
|
930 | a2cfdea2 | Iustin Pop | results = bnf.parseString(out) |
931 | a2cfdea2 | Iustin Pop | except pyp.ParseException, err:
|
932 | a2cfdea2 | Iustin Pop | raise errors.BlockDeviceError("Can't parse drbdsetup show output: %s" % |
933 | a2cfdea2 | Iustin Pop | str(err))
|
934 | a2cfdea2 | Iustin Pop | |
935 | a2cfdea2 | Iustin Pop | # and massage the results into our desired format
|
936 | a2cfdea2 | Iustin Pop | for section in results: |
937 | a2cfdea2 | Iustin Pop | sname = section[0]
|
938 | a2cfdea2 | Iustin Pop | if sname == "_this_host": |
939 | a2cfdea2 | Iustin Pop | for lst in section[1:]: |
940 | a2cfdea2 | Iustin Pop | if lst[0] == "disk": |
941 | a2cfdea2 | Iustin Pop | data["local_dev"] = lst[1] |
942 | a2cfdea2 | Iustin Pop | elif lst[0] == "meta-disk": |
943 | a2cfdea2 | Iustin Pop | data["meta_dev"] = lst[1] |
944 | a2cfdea2 | Iustin Pop | data["meta_index"] = lst[2] |
945 | a2cfdea2 | Iustin Pop | elif lst[0] == "address": |
946 | a2cfdea2 | Iustin Pop | data["local_addr"] = tuple(lst[1:]) |
947 | a2cfdea2 | Iustin Pop | elif sname == "_remote_host": |
948 | a2cfdea2 | Iustin Pop | for lst in section[1:]: |
949 | a2cfdea2 | Iustin Pop | if lst[0] == "address": |
950 | a2cfdea2 | Iustin Pop | data["remote_addr"] = tuple(lst[1:]) |
951 | a2cfdea2 | Iustin Pop | return data
|
952 | a2cfdea2 | Iustin Pop | |
953 | a2cfdea2 | Iustin Pop | def _MatchesLocal(self, info): |
954 | a2cfdea2 | Iustin Pop | """Test if our local config matches with an existing device.
|
955 | a2cfdea2 | Iustin Pop |
|
956 | a2cfdea2 | Iustin Pop | The parameter should be as returned from `_GetDevInfo()`. This
|
957 | a2cfdea2 | Iustin Pop | method tests if our local backing device is the same as the one in
|
958 | a2cfdea2 | Iustin Pop | the info parameter, in effect testing if we look like the given
|
959 | a2cfdea2 | Iustin Pop | device.
|
960 | a2cfdea2 | Iustin Pop |
|
961 | a2cfdea2 | Iustin Pop | """
|
962 | b00b95dd | Iustin Pop | if self._children: |
963 | b00b95dd | Iustin Pop | backend, meta = self._children
|
964 | b00b95dd | Iustin Pop | else:
|
965 | b00b95dd | Iustin Pop | backend = meta = None
|
966 | b00b95dd | Iustin Pop | |
967 | a2cfdea2 | Iustin Pop | if backend is not None: |
968 | b00b95dd | Iustin Pop | retval = ("local_dev" in info and info["local_dev"] == backend.dev_path) |
969 | a2cfdea2 | Iustin Pop | else:
|
970 | a2cfdea2 | Iustin Pop | retval = ("local_dev" not in info) |
971 | b00b95dd | Iustin Pop | |
972 | a2cfdea2 | Iustin Pop | if meta is not None: |
973 | b00b95dd | Iustin Pop | retval = retval and ("meta_dev" in info and |
974 | b00b95dd | Iustin Pop | info["meta_dev"] == meta.dev_path)
|
975 | b00b95dd | Iustin Pop | retval = retval and ("meta_index" in info and |
976 | b00b95dd | Iustin Pop | info["meta_index"] == 0) |
977 | a2cfdea2 | Iustin Pop | else:
|
978 | a2cfdea2 | Iustin Pop | retval = retval and ("meta_dev" not in info and |
979 | a2cfdea2 | Iustin Pop | "meta_index" not in info) |
980 | a2cfdea2 | Iustin Pop | return retval
|
981 | a2cfdea2 | Iustin Pop | |
982 | a2cfdea2 | Iustin Pop | def _MatchesNet(self, info): |
983 | a2cfdea2 | Iustin Pop | """Test if our network config matches with an existing device.
|
984 | a2cfdea2 | Iustin Pop |
|
985 | a2cfdea2 | Iustin Pop | The parameter should be as returned from `_GetDevInfo()`. This
|
986 | a2cfdea2 | Iustin Pop | method tests if our network configuration is the same as the one
|
987 | a2cfdea2 | Iustin Pop | in the info parameter, in effect testing if we look like the given
|
988 | a2cfdea2 | Iustin Pop | device.
|
989 | a2cfdea2 | Iustin Pop |
|
990 | a2cfdea2 | Iustin Pop | """
|
991 | a2cfdea2 | Iustin Pop | if (((self._lhost is None and not ("local_addr" in info)) and |
992 | a2cfdea2 | Iustin Pop | (self._rhost is None and not ("remote_addr" in info)))): |
993 | a2cfdea2 | Iustin Pop | return True |
994 | a2cfdea2 | Iustin Pop | |
995 | a2cfdea2 | Iustin Pop | if self._lhost is None: |
996 | a2cfdea2 | Iustin Pop | return False |
997 | a2cfdea2 | Iustin Pop | |
998 | a2cfdea2 | Iustin Pop | if not ("local_addr" in info and |
999 | a2cfdea2 | Iustin Pop | "remote_addr" in info): |
1000 | a2cfdea2 | Iustin Pop | return False |
1001 | a2cfdea2 | Iustin Pop | |
1002 | a2cfdea2 | Iustin Pop | retval = (info["local_addr"] == (self._lhost, self._lport)) |
1003 | a2cfdea2 | Iustin Pop | retval = (retval and
|
1004 | a2cfdea2 | Iustin Pop | info["remote_addr"] == (self._rhost, self._rport)) |
1005 | a2cfdea2 | Iustin Pop | return retval
|
1006 | a2cfdea2 | Iustin Pop | |
1007 | a2cfdea2 | Iustin Pop | @classmethod
|
1008 | a2cfdea2 | Iustin Pop | def _AssembleLocal(cls, minor, backend, meta): |
1009 | a2cfdea2 | Iustin Pop | """Configure the local part of a DRBD device.
|
1010 | a2cfdea2 | Iustin Pop |
|
1011 | a2cfdea2 | Iustin Pop | """
|
1012 | 333411a7 | Guido Trotter | args = ["drbdsetup", cls._DevPath(minor), "disk", |
1013 | 333411a7 | Guido Trotter | backend, meta, "0", "-e", "detach", "--create-device"] |
1014 | 333411a7 | Guido Trotter | result = utils.RunCmd(args) |
1015 | a2cfdea2 | Iustin Pop | if result.failed:
|
1016 | 468c5f77 | Iustin Pop | logging.error("Can't attach local disk: %s", result.output)
|
1017 | a2cfdea2 | Iustin Pop | return not result.failed |
1018 | a2cfdea2 | Iustin Pop | |
1019 | a2cfdea2 | Iustin Pop | @classmethod
|
1020 | a2cfdea2 | Iustin Pop | def _AssembleNet(cls, minor, net_info, protocol, |
1021 | a2cfdea2 | Iustin Pop | dual_pri=False, hmac=None, secret=None): |
1022 | a2cfdea2 | Iustin Pop | """Configure the network part of the device.
|
1023 | a2cfdea2 | Iustin Pop |
|
1024 | a2cfdea2 | Iustin Pop | """
|
1025 | a2cfdea2 | Iustin Pop | lhost, lport, rhost, rport = net_info |
1026 | 52857176 | Iustin Pop | if None in net_info: |
1027 | 52857176 | Iustin Pop | # we don't want network connection and actually want to make
|
1028 | 52857176 | Iustin Pop | # sure its shutdown
|
1029 | 52857176 | Iustin Pop | return cls._ShutdownNet(minor)
|
1030 | 52857176 | Iustin Pop | |
1031 | 7d585316 | Iustin Pop | # Workaround for a race condition. When DRBD is doing its dance to
|
1032 | 7d585316 | Iustin Pop | # establish a connection with its peer, it also sends the
|
1033 | 7d585316 | Iustin Pop | # synchronization speed over the wire. In some cases setting the
|
1034 | 7d585316 | Iustin Pop | # sync speed only after setting up both sides can race with DRBD
|
1035 | 7d585316 | Iustin Pop | # connecting, hence we set it here before telling DRBD anything
|
1036 | 7d585316 | Iustin Pop | # about its peer.
|
1037 | 7d585316 | Iustin Pop | cls._SetMinorSyncSpeed(minor, constants.SYNC_SPEED) |
1038 | 7d585316 | Iustin Pop | |
1039 | a2cfdea2 | Iustin Pop | args = ["drbdsetup", cls._DevPath(minor), "net", |
1040 | f38478b2 | Iustin Pop | "%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), protocol, |
1041 | f38478b2 | Iustin Pop | "-A", "discard-zero-changes", |
1042 | f38478b2 | Iustin Pop | "-B", "consensus", |
1043 | ab6cc81c | Iustin Pop | "--create-device",
|
1044 | f38478b2 | Iustin Pop | ] |
1045 | a2cfdea2 | Iustin Pop | if dual_pri:
|
1046 | a2cfdea2 | Iustin Pop | args.append("-m")
|
1047 | a2cfdea2 | Iustin Pop | if hmac and secret: |
1048 | a2cfdea2 | Iustin Pop | args.extend(["-a", hmac, "-x", secret]) |
1049 | a2cfdea2 | Iustin Pop | result = utils.RunCmd(args) |
1050 | a2cfdea2 | Iustin Pop | if result.failed:
|
1051 | 468c5f77 | Iustin Pop | logging.error("Can't setup network for dbrd device: %s - %s",
|
1052 | 468c5f77 | Iustin Pop | result.fail_reason, result.output) |
1053 | a2cfdea2 | Iustin Pop | return False |
1054 | a2cfdea2 | Iustin Pop | |
1055 | a2cfdea2 | Iustin Pop | timeout = time.time() + 10
|
1056 | a2cfdea2 | Iustin Pop | ok = False
|
1057 | a2cfdea2 | Iustin Pop | while time.time() < timeout:
|
1058 | 3840729d | Iustin Pop | info = cls._GetDevInfo(cls._GetShowData(minor)) |
1059 | a2cfdea2 | Iustin Pop | if not "local_addr" in info or not "remote_addr" in info: |
1060 | a2cfdea2 | Iustin Pop | time.sleep(1)
|
1061 | a2cfdea2 | Iustin Pop | continue
|
1062 | a2cfdea2 | Iustin Pop | if (info["local_addr"] != (lhost, lport) or |
1063 | a2cfdea2 | Iustin Pop | info["remote_addr"] != (rhost, rport)):
|
1064 | a2cfdea2 | Iustin Pop | time.sleep(1)
|
1065 | a2cfdea2 | Iustin Pop | continue
|
1066 | a2cfdea2 | Iustin Pop | ok = True
|
1067 | a2cfdea2 | Iustin Pop | break
|
1068 | a2cfdea2 | Iustin Pop | if not ok: |
1069 | 468c5f77 | Iustin Pop | logging.error("Timeout while configuring network")
|
1070 | a2cfdea2 | Iustin Pop | return False |
1071 | a2cfdea2 | Iustin Pop | return True |
1072 | a2cfdea2 | Iustin Pop | |
1073 | b00b95dd | Iustin Pop | def AddChildren(self, devices): |
1074 | b00b95dd | Iustin Pop | """Add a disk to the DRBD device.
|
1075 | b00b95dd | Iustin Pop |
|
1076 | b00b95dd | Iustin Pop | """
|
1077 | b00b95dd | Iustin Pop | if self.minor is None: |
1078 | b00b95dd | Iustin Pop | raise errors.BlockDeviceError("Can't attach to dbrd8 during AddChildren") |
1079 | b00b95dd | Iustin Pop | if len(devices) != 2: |
1080 | b00b95dd | Iustin Pop | raise errors.BlockDeviceError("Need two devices for AddChildren") |
1081 | 3840729d | Iustin Pop | info = self._GetDevInfo(self._GetShowData(self.minor)) |
1082 | 03ece5f3 | Iustin Pop | if "local_dev" in info: |
1083 | b00b95dd | Iustin Pop | raise errors.BlockDeviceError("DRBD8 already attached to a local disk") |
1084 | b00b95dd | Iustin Pop | backend, meta = devices |
1085 | b00b95dd | Iustin Pop | if backend.dev_path is None or meta.dev_path is None: |
1086 | b00b95dd | Iustin Pop | raise errors.BlockDeviceError("Children not ready during AddChildren") |
1087 | b00b95dd | Iustin Pop | backend.Open() |
1088 | b00b95dd | Iustin Pop | meta.Open() |
1089 | b00b95dd | Iustin Pop | if not self._CheckMetaSize(meta.dev_path): |
1090 | b00b95dd | Iustin Pop | raise errors.BlockDeviceError("Invalid meta device size") |
1091 | b00b95dd | Iustin Pop | self._InitMeta(self._FindUnusedMinor(), meta.dev_path) |
1092 | b00b95dd | Iustin Pop | |
1093 | b00b95dd | Iustin Pop | if not self._AssembleLocal(self.minor, backend.dev_path, meta.dev_path): |
1094 | b00b95dd | Iustin Pop | raise errors.BlockDeviceError("Can't attach to local storage") |
1095 | b00b95dd | Iustin Pop | self._children = devices
|
1096 | b00b95dd | Iustin Pop | |
1097 | b00b95dd | Iustin Pop | def RemoveChildren(self, devices): |
1098 | b00b95dd | Iustin Pop | """Detach the drbd device from local storage.
|
1099 | b00b95dd | Iustin Pop |
|
1100 | b00b95dd | Iustin Pop | """
|
1101 | b00b95dd | Iustin Pop | if self.minor is None: |
1102 | b00b95dd | Iustin Pop | raise errors.BlockDeviceError("Can't attach to drbd8 during" |
1103 | b00b95dd | Iustin Pop | " RemoveChildren")
|
1104 | 03ece5f3 | Iustin Pop | # early return if we don't actually have backing storage
|
1105 | 3840729d | Iustin Pop | info = self._GetDevInfo(self._GetShowData(self.minor)) |
1106 | 03ece5f3 | Iustin Pop | if "local_dev" not in info: |
1107 | 03ece5f3 | Iustin Pop | return
|
1108 | b00b95dd | Iustin Pop | if len(self._children) != 2: |
1109 | b00b95dd | Iustin Pop | raise errors.BlockDeviceError("We don't have two children: %s" % |
1110 | b00b95dd | Iustin Pop | self._children)
|
1111 | e739bd57 | Iustin Pop | if self._children.count(None) == 2: # we don't actually have children :) |
1112 | 468c5f77 | Iustin Pop | logging.error("Requested detach while detached")
|
1113 | e739bd57 | Iustin Pop | return
|
1114 | b00b95dd | Iustin Pop | if len(devices) != 2: |
1115 | b00b95dd | Iustin Pop | raise errors.BlockDeviceError("We need two children in RemoveChildren") |
1116 | e739bd57 | Iustin Pop | for child, dev in zip(self._children, devices): |
1117 | e739bd57 | Iustin Pop | if dev != child.dev_path:
|
1118 | e739bd57 | Iustin Pop | raise errors.BlockDeviceError("Mismatch in local storage" |
1119 | e739bd57 | Iustin Pop | " (%s != %s) in RemoveChildren" %
|
1120 | e739bd57 | Iustin Pop | (dev, child.dev_path)) |
1121 | b00b95dd | Iustin Pop | |
1122 | b00b95dd | Iustin Pop | if not self._ShutdownLocal(self.minor): |
1123 | b00b95dd | Iustin Pop | raise errors.BlockDeviceError("Can't detach from local storage") |
1124 | b00b95dd | Iustin Pop | self._children = []
|
1125 | b00b95dd | Iustin Pop | |
1126 | 7d585316 | Iustin Pop | @classmethod
|
1127 | 7d585316 | Iustin Pop | def _SetMinorSyncSpeed(cls, minor, kbytes): |
1128 | a2cfdea2 | Iustin Pop | """Set the speed of the DRBD syncer.
|
1129 | a2cfdea2 | Iustin Pop |
|
1130 | 7d585316 | Iustin Pop | This is the low-level implementation.
|
1131 | 7d585316 | Iustin Pop |
|
1132 | 7d585316 | Iustin Pop | @type minor: int
|
1133 | 7d585316 | Iustin Pop | @param minor: the drbd minor whose settings we change
|
1134 | 7d585316 | Iustin Pop | @type kbytes: int
|
1135 | 7d585316 | Iustin Pop | @param kbytes: the speed in kbytes/second
|
1136 | 7d585316 | Iustin Pop | @rtype: boolean
|
1137 | 7d585316 | Iustin Pop | @return: the success of the operation
|
1138 | 7d585316 | Iustin Pop |
|
1139 | a2cfdea2 | Iustin Pop | """
|
1140 | 7d585316 | Iustin Pop | result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "syncer", |
1141 | 7d585316 | Iustin Pop | "-r", "%d" % kbytes, "--create-device"]) |
1142 | a2cfdea2 | Iustin Pop | if result.failed:
|
1143 | 468c5f77 | Iustin Pop | logging.error("Can't change syncer rate: %s - %s",
|
1144 | 468c5f77 | Iustin Pop | result.fail_reason, result.output) |
1145 | 7d585316 | Iustin Pop | return not result.failed |
1146 | 7d585316 | Iustin Pop | |
1147 | 7d585316 | Iustin Pop | def SetSyncSpeed(self, kbytes): |
1148 | 7d585316 | Iustin Pop | """Set the speed of the DRBD syncer.
|
1149 | 7d585316 | Iustin Pop |
|
1150 | 7d585316 | Iustin Pop | @type kbytes: int
|
1151 | 7d585316 | Iustin Pop | @param kbytes: the speed in kbytes/second
|
1152 | 7d585316 | Iustin Pop | @rtype: boolean
|
1153 | 7d585316 | Iustin Pop | @return: the success of the operation
|
1154 | 7d585316 | Iustin Pop |
|
1155 | 7d585316 | Iustin Pop | """
|
1156 | 7d585316 | Iustin Pop | if self.minor is None: |
1157 | 7d585316 | Iustin Pop | logging.info("Not attached during SetSyncSpeed")
|
1158 | 7d585316 | Iustin Pop | return False |
1159 | 7d585316 | Iustin Pop | children_result = super(DRBD8, self).SetSyncSpeed(kbytes) |
1160 | 7d585316 | Iustin Pop | return self._SetMinorSyncSpeed(self.minor, kbytes) and children_result |
1161 | a2cfdea2 | Iustin Pop | |
1162 | 6b90c22e | Iustin Pop | def GetProcStatus(self): |
1163 | 6b90c22e | Iustin Pop | """Return device data from /proc.
|
1164 | 6b90c22e | Iustin Pop |
|
1165 | 6b90c22e | Iustin Pop | """
|
1166 | 6b90c22e | Iustin Pop | if self.minor is None: |
1167 | 6b90c22e | Iustin Pop | raise errors.BlockDeviceError("GetStats() called while not attached") |
1168 | 6b90c22e | Iustin Pop | proc_info = self._MassageProcData(self._GetProcData()) |
1169 | 6b90c22e | Iustin Pop | if self.minor not in proc_info: |
1170 | 6b90c22e | Iustin Pop | raise errors.BlockDeviceError("Can't find myself in /proc (minor %d)" % |
1171 | 6b90c22e | Iustin Pop | self.minor)
|
1172 | 6b90c22e | Iustin Pop | return DRBD8Status(proc_info[self.minor]) |
1173 | 6b90c22e | Iustin Pop | |
1174 | a2cfdea2 | Iustin Pop | def GetSyncStatus(self): |
1175 | a2cfdea2 | Iustin Pop | """Returns the sync status of the device.
|
1176 | a2cfdea2 | Iustin Pop |
|
1177 | a2cfdea2 | Iustin Pop |
|
1178 | a2cfdea2 | Iustin Pop | If sync_percent is None, it means all is ok
|
1179 | a2cfdea2 | Iustin Pop | If estimated_time is None, it means we can't esimate
|
1180 | 0834c866 | Iustin Pop | the time needed, otherwise it's the time left in seconds.
|
1181 | 0834c866 | Iustin Pop |
|
1182 | 0834c866 | Iustin Pop |
|
1183 | 0834c866 | Iustin Pop | We set the is_degraded parameter to True on two conditions:
|
1184 | 0834c866 | Iustin Pop | network not connected or local disk missing.
|
1185 | 0834c866 | Iustin Pop |
|
1186 | 0834c866 | Iustin Pop | We compute the ldisk parameter based on wheter we have a local
|
1187 | 0834c866 | Iustin Pop | disk or not.
|
1188 | a2cfdea2 | Iustin Pop |
|
1189 | c41eea6e | Iustin Pop | @rtype: tuple
|
1190 | c41eea6e | Iustin Pop | @return: (sync_percent, estimated_time, is_degraded, ldisk)
|
1191 | c41eea6e | Iustin Pop |
|
1192 | a2cfdea2 | Iustin Pop | """
|
1193 | a2cfdea2 | Iustin Pop | if self.minor is None and not self.Attach(): |
1194 | a2cfdea2 | Iustin Pop | raise errors.BlockDeviceError("Can't attach to device in GetSyncStatus") |
1195 | 6b90c22e | Iustin Pop | stats = self.GetProcStatus()
|
1196 | 6b90c22e | Iustin Pop | ldisk = not stats.is_disk_uptodate
|
1197 | 6b90c22e | Iustin Pop | is_degraded = not stats.is_connected
|
1198 | 6b90c22e | Iustin Pop | return stats.sync_percent, stats.est_time, is_degraded or ldisk, ldisk |
1199 | a2cfdea2 | Iustin Pop | |
1200 | a2cfdea2 | Iustin Pop | def Open(self, force=False): |
1201 | a2cfdea2 | Iustin Pop | """Make the local state primary.
|
1202 | a2cfdea2 | Iustin Pop |
|
1203 | f860ff4e | Guido Trotter | If the 'force' parameter is given, the '-o' option is passed to
|
1204 | f860ff4e | Guido Trotter | drbdsetup. Since this is a potentially dangerous operation, the
|
1205 | a2cfdea2 | Iustin Pop | force flag should be only given after creation, when it actually
|
1206 | f860ff4e | Guido Trotter | is mandatory.
|
1207 | a2cfdea2 | Iustin Pop |
|
1208 | a2cfdea2 | Iustin Pop | """
|
1209 | a2cfdea2 | Iustin Pop | if self.minor is None and not self.Attach(): |
1210 | 468c5f77 | Iustin Pop | logging.error("DRBD cannot attach to a device during open")
|
1211 | a2cfdea2 | Iustin Pop | return False |
1212 | a2cfdea2 | Iustin Pop | cmd = ["drbdsetup", self.dev_path, "primary"] |
1213 | a2cfdea2 | Iustin Pop | if force:
|
1214 | a2cfdea2 | Iustin Pop | cmd.append("-o")
|
1215 | a2cfdea2 | Iustin Pop | result = utils.RunCmd(cmd) |
1216 | a2cfdea2 | Iustin Pop | if result.failed:
|
1217 | fdbd668d | Iustin Pop | msg = ("Can't make drbd device primary: %s" % result.output)
|
1218 | 468c5f77 | Iustin Pop | logging.error(msg) |
1219 | fdbd668d | Iustin Pop | raise errors.BlockDeviceError(msg)
|
1220 | a2cfdea2 | Iustin Pop | |
1221 | a2cfdea2 | Iustin Pop | def Close(self): |
1222 | a2cfdea2 | Iustin Pop | """Make the local state secondary.
|
1223 | a2cfdea2 | Iustin Pop |
|
1224 | a2cfdea2 | Iustin Pop | This will, of course, fail if the device is in use.
|
1225 | a2cfdea2 | Iustin Pop |
|
1226 | a2cfdea2 | Iustin Pop | """
|
1227 | a2cfdea2 | Iustin Pop | if self.minor is None and not self.Attach(): |
1228 | 468c5f77 | Iustin Pop | logging.info("Instance not attached to a device")
|
1229 | a2cfdea2 | Iustin Pop | raise errors.BlockDeviceError("Can't find device") |
1230 | a2cfdea2 | Iustin Pop | result = utils.RunCmd(["drbdsetup", self.dev_path, "secondary"]) |
1231 | a2cfdea2 | Iustin Pop | if result.failed:
|
1232 | fdbd668d | Iustin Pop | msg = ("Can't switch drbd device to"
|
1233 | fdbd668d | Iustin Pop | " secondary: %s" % result.output)
|
1234 | 468c5f77 | Iustin Pop | logging.error(msg) |
1235 | fdbd668d | Iustin Pop | raise errors.BlockDeviceError(msg)
|
1236 | a2cfdea2 | Iustin Pop | |
1237 | cf8df3f3 | Iustin Pop | def DisconnectNet(self): |
1238 | cf8df3f3 | Iustin Pop | """Removes network configuration.
|
1239 | cf8df3f3 | Iustin Pop |
|
1240 | cf8df3f3 | Iustin Pop | This method shutdowns the network side of the device.
|
1241 | cf8df3f3 | Iustin Pop |
|
1242 | cf8df3f3 | Iustin Pop | The method will wait up to a hardcoded timeout for the device to
|
1243 | cf8df3f3 | Iustin Pop | go into standalone after the 'disconnect' command before
|
1244 | cf8df3f3 | Iustin Pop | re-configuring it, as sometimes it takes a while for the
|
1245 | cf8df3f3 | Iustin Pop | disconnect to actually propagate and thus we might issue a 'net'
|
1246 | cf8df3f3 | Iustin Pop | command while the device is still connected. If the device will
|
1247 | cf8df3f3 | Iustin Pop | still be attached to the network and we time out, we raise an
|
1248 | cf8df3f3 | Iustin Pop | exception.
|
1249 | cf8df3f3 | Iustin Pop |
|
1250 | cf8df3f3 | Iustin Pop | """
|
1251 | cf8df3f3 | Iustin Pop | if self.minor is None: |
1252 | cf8df3f3 | Iustin Pop | raise errors.BlockDeviceError("DRBD disk not attached in re-attach net") |
1253 | cf8df3f3 | Iustin Pop | |
1254 | cf8df3f3 | Iustin Pop | if None in (self._lhost, self._lport, self._rhost, self._rport): |
1255 | cf8df3f3 | Iustin Pop | raise errors.BlockDeviceError("DRBD disk missing network info in" |
1256 | cf8df3f3 | Iustin Pop | " DisconnectNet()")
|
1257 | cf8df3f3 | Iustin Pop | |
1258 | cf8df3f3 | Iustin Pop | ever_disconnected = self._ShutdownNet(self.minor) |
1259 | cf8df3f3 | Iustin Pop | timeout_limit = time.time() + self._NET_RECONFIG_TIMEOUT
|
1260 | cf8df3f3 | Iustin Pop | sleep_time = 0.100 # we start the retry time at 100 miliseconds |
1261 | cf8df3f3 | Iustin Pop | while time.time() < timeout_limit:
|
1262 | cf8df3f3 | Iustin Pop | status = self.GetProcStatus()
|
1263 | cf8df3f3 | Iustin Pop | if status.is_standalone:
|
1264 | cf8df3f3 | Iustin Pop | break
|
1265 | cf8df3f3 | Iustin Pop | # retry the disconnect, it seems possible that due to a
|
1266 | cf8df3f3 | Iustin Pop | # well-time disconnect on the peer, my disconnect command might
|
1267 | cf8df3f3 | Iustin Pop | # be ingored and forgotten
|
1268 | cf8df3f3 | Iustin Pop | ever_disconnected = self._ShutdownNet(self.minor) or ever_disconnected |
1269 | cf8df3f3 | Iustin Pop | time.sleep(sleep_time) |
1270 | cf8df3f3 | Iustin Pop | sleep_time = min(2, sleep_time * 1.5) |
1271 | cf8df3f3 | Iustin Pop | |
1272 | cf8df3f3 | Iustin Pop | if not status.is_standalone: |
1273 | cf8df3f3 | Iustin Pop | if ever_disconnected:
|
1274 | cf8df3f3 | Iustin Pop | msg = ("Device did not react to the"
|
1275 | cf8df3f3 | Iustin Pop | " 'disconnect' command in a timely manner")
|
1276 | cf8df3f3 | Iustin Pop | else:
|
1277 | cf8df3f3 | Iustin Pop | msg = ("Can't shutdown network, even after multiple retries")
|
1278 | cf8df3f3 | Iustin Pop | raise errors.BlockDeviceError(msg)
|
1279 | cf8df3f3 | Iustin Pop | |
1280 | cf8df3f3 | Iustin Pop | reconfig_time = time.time() - timeout_limit + self._NET_RECONFIG_TIMEOUT
|
1281 | cf8df3f3 | Iustin Pop | if reconfig_time > 15: # hardcoded alert limit |
1282 | cf8df3f3 | Iustin Pop | logging.debug("DRBD8.DisconnectNet: detach took %.3f seconds",
|
1283 | cf8df3f3 | Iustin Pop | reconfig_time) |
1284 | cf8df3f3 | Iustin Pop | |
1285 | cf8df3f3 | Iustin Pop | def AttachNet(self, multimaster): |
1286 | cf8df3f3 | Iustin Pop | """Reconnects the network.
|
1287 | cf8df3f3 | Iustin Pop |
|
1288 | cf8df3f3 | Iustin Pop | This method connects the network side of the device with a
|
1289 | cf8df3f3 | Iustin Pop | specified multi-master flag. The device needs to be 'Standalone'
|
1290 | cf8df3f3 | Iustin Pop | but have valid network configuration data.
|
1291 | cf8df3f3 | Iustin Pop |
|
1292 | cf8df3f3 | Iustin Pop | Args:
|
1293 | cf8df3f3 | Iustin Pop | - multimaster: init the network in dual-primary mode
|
1294 | cf8df3f3 | Iustin Pop |
|
1295 | cf8df3f3 | Iustin Pop | """
|
1296 | cf8df3f3 | Iustin Pop | if self.minor is None: |
1297 | cf8df3f3 | Iustin Pop | raise errors.BlockDeviceError("DRBD disk not attached in AttachNet") |
1298 | cf8df3f3 | Iustin Pop | |
1299 | cf8df3f3 | Iustin Pop | if None in (self._lhost, self._lport, self._rhost, self._rport): |
1300 | cf8df3f3 | Iustin Pop | raise errors.BlockDeviceError("DRBD disk missing network info in" |
1301 | cf8df3f3 | Iustin Pop | " AttachNet()")
|
1302 | cf8df3f3 | Iustin Pop | |
1303 | cf8df3f3 | Iustin Pop | status = self.GetProcStatus()
|
1304 | cf8df3f3 | Iustin Pop | |
1305 | cf8df3f3 | Iustin Pop | if not status.is_standalone: |
1306 | cf8df3f3 | Iustin Pop | raise errors.BlockDeviceError("Device is not standalone in AttachNet") |
1307 | cf8df3f3 | Iustin Pop | |
1308 | cf8df3f3 | Iustin Pop | return self._AssembleNet(self.minor, |
1309 | cf8df3f3 | Iustin Pop | (self._lhost, self._lport, |
1310 | cf8df3f3 | Iustin Pop | self._rhost, self._rport), |
1311 | cf8df3f3 | Iustin Pop | "C", dual_pri=multimaster)
|
1312 | cf8df3f3 | Iustin Pop | |
1313 | a2cfdea2 | Iustin Pop | def Attach(self): |
1314 | 2d0c8319 | Iustin Pop | """Check if our minor is configured.
|
1315 | 2d0c8319 | Iustin Pop |
|
1316 | 2d0c8319 | Iustin Pop | This doesn't do any device configurations - it only checks if the
|
1317 | 2d0c8319 | Iustin Pop | minor is in a state different from Unconfigured.
|
1318 | 2d0c8319 | Iustin Pop |
|
1319 | 2d0c8319 | Iustin Pop | Note that this function will not change the state of the system in
|
1320 | 2d0c8319 | Iustin Pop | any way (except in case of side-effects caused by reading from
|
1321 | 2d0c8319 | Iustin Pop | /proc).
|
1322 | 2d0c8319 | Iustin Pop |
|
1323 | 2d0c8319 | Iustin Pop | """
|
1324 | 6d2e83d5 | Iustin Pop | used_devs = self.GetUsedDevs()
|
1325 | 2d0c8319 | Iustin Pop | if self._aminor in used_devs: |
1326 | 2d0c8319 | Iustin Pop | minor = self._aminor
|
1327 | 2d0c8319 | Iustin Pop | else:
|
1328 | 2d0c8319 | Iustin Pop | minor = None
|
1329 | 2d0c8319 | Iustin Pop | |
1330 | 2d0c8319 | Iustin Pop | self._SetFromMinor(minor)
|
1331 | 2d0c8319 | Iustin Pop | return minor is not None |
1332 | 2d0c8319 | Iustin Pop | |
1333 | 2d0c8319 | Iustin Pop | def Assemble(self): |
1334 | 2d0c8319 | Iustin Pop | """Assemble the drbd.
|
1335 | 2d0c8319 | Iustin Pop |
|
1336 | 2d0c8319 | Iustin Pop | Method:
|
1337 | 2d0c8319 | Iustin Pop | - if we have a configured device, we try to ensure that it matches
|
1338 | 2d0c8319 | Iustin Pop | our config
|
1339 | 2d0c8319 | Iustin Pop | - if not, we create it from zero
|
1340 | 2d0c8319 | Iustin Pop |
|
1341 | 2d0c8319 | Iustin Pop | """
|
1342 | 2d0c8319 | Iustin Pop | result = super(DRBD8, self).Assemble() |
1343 | 2d0c8319 | Iustin Pop | if not result: |
1344 | 2d0c8319 | Iustin Pop | return result
|
1345 | 2d0c8319 | Iustin Pop | |
1346 | 2d0c8319 | Iustin Pop | self.Attach()
|
1347 | 2d0c8319 | Iustin Pop | if self.minor is None: |
1348 | 2d0c8319 | Iustin Pop | # local device completely unconfigured
|
1349 | 2d0c8319 | Iustin Pop | return self._FastAssemble() |
1350 | 2d0c8319 | Iustin Pop | else:
|
1351 | 2d0c8319 | Iustin Pop | # we have to recheck the local and network status and try to fix
|
1352 | 2d0c8319 | Iustin Pop | # the device
|
1353 | 2d0c8319 | Iustin Pop | return self._SlowAssemble() |
1354 | 2d0c8319 | Iustin Pop | |
1355 | 2d0c8319 | Iustin Pop | def _SlowAssemble(self): |
1356 | 2d0c8319 | Iustin Pop | """Assembles the DRBD device from a (partially) configured device.
|
1357 | a2cfdea2 | Iustin Pop |
|
1358 | a2cfdea2 | Iustin Pop | In case of partially attached (local device matches but no network
|
1359 | a2cfdea2 | Iustin Pop | setup), we perform the network attach. If successful, we re-test
|
1360 | a2cfdea2 | Iustin Pop | the attach if can return success.
|
1361 | a2cfdea2 | Iustin Pop |
|
1362 | a2cfdea2 | Iustin Pop | """
|
1363 | a1578d63 | Iustin Pop | for minor in (self._aminor,): |
1364 | 3840729d | Iustin Pop | info = self._GetDevInfo(self._GetShowData(minor)) |
1365 | a2cfdea2 | Iustin Pop | match_l = self._MatchesLocal(info)
|
1366 | a2cfdea2 | Iustin Pop | match_r = self._MatchesNet(info)
|
1367 | a2cfdea2 | Iustin Pop | if match_l and match_r: |
1368 | a2cfdea2 | Iustin Pop | break
|
1369 | a2cfdea2 | Iustin Pop | if match_l and not match_r and "local_addr" not in info: |
1370 | a2cfdea2 | Iustin Pop | res_r = self._AssembleNet(minor,
|
1371 | a2cfdea2 | Iustin Pop | (self._lhost, self._lport, |
1372 | a2cfdea2 | Iustin Pop | self._rhost, self._rport), |
1373 | 3c03759a | Iustin Pop | constants.DRBD_NET_PROTOCOL, |
1374 | 3c03759a | Iustin Pop | hmac=constants.DRBD_HMAC_ALG, |
1375 | 2899d9de | Iustin Pop | secret=self._secret
|
1376 | 2899d9de | Iustin Pop | ) |
1377 | 3840729d | Iustin Pop | if res_r:
|
1378 | 3840729d | Iustin Pop | if self._MatchesNet(self._GetDevInfo(self._GetShowData(minor))): |
1379 | 3840729d | Iustin Pop | break
|
1380 | fc1dc9d7 | Iustin Pop | # the weakest case: we find something that is only net attached
|
1381 | fc1dc9d7 | Iustin Pop | # even though we were passed some children at init time
|
1382 | fc1dc9d7 | Iustin Pop | if match_r and "local_dev" not in info: |
1383 | fc1dc9d7 | Iustin Pop | break
|
1384 | bf25af3b | Iustin Pop | |
1385 | bf25af3b | Iustin Pop | # this case must be considered only if we actually have local
|
1386 | bf25af3b | Iustin Pop | # storage, i.e. not in diskless mode, because all diskless
|
1387 | bf25af3b | Iustin Pop | # devices are equal from the point of view of local
|
1388 | bf25af3b | Iustin Pop | # configuration
|
1389 | bf25af3b | Iustin Pop | if (match_l and "local_dev" in info and |
1390 | bf25af3b | Iustin Pop | not match_r and "local_addr" in info): |
1391 | 9cdbe77f | Iustin Pop | # strange case - the device network part points to somewhere
|
1392 | 9cdbe77f | Iustin Pop | # else, even though its local storage is ours; as we own the
|
1393 | 9cdbe77f | Iustin Pop | # drbd space, we try to disconnect from the remote peer and
|
1394 | 9cdbe77f | Iustin Pop | # reconnect to our correct one
|
1395 | 9cdbe77f | Iustin Pop | if not self._ShutdownNet(minor): |
1396 | 9cdbe77f | Iustin Pop | raise errors.BlockDeviceError("Device has correct local storage," |
1397 | 9cdbe77f | Iustin Pop | " wrong remote peer and is unable to"
|
1398 | 9cdbe77f | Iustin Pop | " disconnect in order to attach to"
|
1399 | 9cdbe77f | Iustin Pop | " the correct peer")
|
1400 | 9cdbe77f | Iustin Pop | # note: _AssembleNet also handles the case when we don't want
|
1401 | 9cdbe77f | Iustin Pop | # local storage (i.e. one or more of the _[lr](host|port) is
|
1402 | 9cdbe77f | Iustin Pop | # None)
|
1403 | 9cdbe77f | Iustin Pop | if (self._AssembleNet(minor, (self._lhost, self._lport, |
1404 | 3c03759a | Iustin Pop | self._rhost, self._rport), |
1405 | 3c03759a | Iustin Pop | constants.DRBD_NET_PROTOCOL, |
1406 | 2899d9de | Iustin Pop | hmac=constants.DRBD_HMAC_ALG, |
1407 | 2899d9de | Iustin Pop | secret=self._secret) and |
1408 | 3840729d | Iustin Pop | self._MatchesNet(self._GetDevInfo(self._GetShowData(minor)))): |
1409 | 9cdbe77f | Iustin Pop | break
|
1410 | 9cdbe77f | Iustin Pop | |
1411 | a2cfdea2 | Iustin Pop | else:
|
1412 | a2cfdea2 | Iustin Pop | minor = None
|
1413 | a2cfdea2 | Iustin Pop | |
1414 | a2cfdea2 | Iustin Pop | self._SetFromMinor(minor)
|
1415 | a2cfdea2 | Iustin Pop | return minor is not None |
1416 | a2cfdea2 | Iustin Pop | |
1417 | 2d0c8319 | Iustin Pop | def _FastAssemble(self): |
1418 | 2d0c8319 | Iustin Pop | """Assemble the drbd device from zero.
|
1419 | a2cfdea2 | Iustin Pop |
|
1420 | 2d0c8319 | Iustin Pop | This is run when in Assemble we detect our minor is unused.
|
1421 | a2cfdea2 | Iustin Pop |
|
1422 | a2cfdea2 | Iustin Pop | """
|
1423 | a1578d63 | Iustin Pop | # TODO: maybe completely tear-down the minor (drbdsetup ... down)
|
1424 | a1578d63 | Iustin Pop | # before attaching our own?
|
1425 | a1578d63 | Iustin Pop | minor = self._aminor
|
1426 | a2cfdea2 | Iustin Pop | need_localdev_teardown = False
|
1427 | fc1dc9d7 | Iustin Pop | if self._children and self._children[0] and self._children[1]: |
1428 | a2cfdea2 | Iustin Pop | result = self._AssembleLocal(minor, self._children[0].dev_path, |
1429 | a2cfdea2 | Iustin Pop | self._children[1].dev_path) |
1430 | a2cfdea2 | Iustin Pop | if not result: |
1431 | a2cfdea2 | Iustin Pop | return False |
1432 | a2cfdea2 | Iustin Pop | need_localdev_teardown = True
|
1433 | a2cfdea2 | Iustin Pop | if self._lhost and self._lport and self._rhost and self._rport: |
1434 | a2cfdea2 | Iustin Pop | result = self._AssembleNet(minor,
|
1435 | a2cfdea2 | Iustin Pop | (self._lhost, self._lport, |
1436 | a2cfdea2 | Iustin Pop | self._rhost, self._rport), |
1437 | 3c03759a | Iustin Pop | constants.DRBD_NET_PROTOCOL, |
1438 | 3c03759a | Iustin Pop | hmac=constants.DRBD_HMAC_ALG, |
1439 | 2899d9de | Iustin Pop | secret=self._secret)
|
1440 | a2cfdea2 | Iustin Pop | if not result: |
1441 | a2cfdea2 | Iustin Pop | if need_localdev_teardown:
|
1442 | a2cfdea2 | Iustin Pop | # we will ignore failures from this
|
1443 | 468c5f77 | Iustin Pop | logging.error("net setup failed, tearing down local device")
|
1444 | a2cfdea2 | Iustin Pop | self._ShutdownAll(minor)
|
1445 | a2cfdea2 | Iustin Pop | return False |
1446 | a2cfdea2 | Iustin Pop | self._SetFromMinor(minor)
|
1447 | a2cfdea2 | Iustin Pop | return True |
1448 | a2cfdea2 | Iustin Pop | |
1449 | a2cfdea2 | Iustin Pop | @classmethod
|
1450 | b00b95dd | Iustin Pop | def _ShutdownLocal(cls, minor): |
1451 | b00b95dd | Iustin Pop | """Detach from the local device.
|
1452 | b00b95dd | Iustin Pop |
|
1453 | b00b95dd | Iustin Pop | I/Os will continue to be served from the remote device. If we
|
1454 | b00b95dd | Iustin Pop | don't have a remote device, this operation will fail.
|
1455 | b00b95dd | Iustin Pop |
|
1456 | b00b95dd | Iustin Pop | """
|
1457 | b00b95dd | Iustin Pop | result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "detach"]) |
1458 | b00b95dd | Iustin Pop | if result.failed:
|
1459 | 468c5f77 | Iustin Pop | logging.error("Can't detach local device: %s", result.output)
|
1460 | b00b95dd | Iustin Pop | return not result.failed |
1461 | b00b95dd | Iustin Pop | |
1462 | b00b95dd | Iustin Pop | @classmethod
|
1463 | f3e513ad | Iustin Pop | def _ShutdownNet(cls, minor): |
1464 | f3e513ad | Iustin Pop | """Disconnect from the remote peer.
|
1465 | f3e513ad | Iustin Pop |
|
1466 | f3e513ad | Iustin Pop | This fails if we don't have a local device.
|
1467 | f3e513ad | Iustin Pop |
|
1468 | f3e513ad | Iustin Pop | """
|
1469 | f3e513ad | Iustin Pop | result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disconnect"]) |
1470 | a8459f1c | Iustin Pop | if result.failed:
|
1471 | 468c5f77 | Iustin Pop | logging.error("Can't shutdown network: %s", result.output)
|
1472 | f3e513ad | Iustin Pop | return not result.failed |
1473 | f3e513ad | Iustin Pop | |
1474 | f3e513ad | Iustin Pop | @classmethod
|
1475 | a2cfdea2 | Iustin Pop | def _ShutdownAll(cls, minor): |
1476 | a2cfdea2 | Iustin Pop | """Deactivate the device.
|
1477 | a2cfdea2 | Iustin Pop |
|
1478 | a2cfdea2 | Iustin Pop | This will, of course, fail if the device is in use.
|
1479 | a2cfdea2 | Iustin Pop |
|
1480 | a2cfdea2 | Iustin Pop | """
|
1481 | a2cfdea2 | Iustin Pop | result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "down"]) |
1482 | a2cfdea2 | Iustin Pop | if result.failed:
|
1483 | 468c5f77 | Iustin Pop | logging.error("Can't shutdown drbd device: %s", result.output)
|
1484 | a2cfdea2 | Iustin Pop | return not result.failed |
1485 | a2cfdea2 | Iustin Pop | |
1486 | a2cfdea2 | Iustin Pop | def Shutdown(self): |
1487 | a2cfdea2 | Iustin Pop | """Shutdown the DRBD device.
|
1488 | a2cfdea2 | Iustin Pop |
|
1489 | a2cfdea2 | Iustin Pop | """
|
1490 | a2cfdea2 | Iustin Pop | if self.minor is None and not self.Attach(): |
1491 | 468c5f77 | Iustin Pop | logging.info("DRBD device not attached to a device during Shutdown")
|
1492 | a2cfdea2 | Iustin Pop | return True |
1493 | a2cfdea2 | Iustin Pop | if not self._ShutdownAll(self.minor): |
1494 | a2cfdea2 | Iustin Pop | return False |
1495 | a2cfdea2 | Iustin Pop | self.minor = None |
1496 | a2cfdea2 | Iustin Pop | self.dev_path = None |
1497 | a2cfdea2 | Iustin Pop | return True |
1498 | a2cfdea2 | Iustin Pop | |
1499 | a2cfdea2 | Iustin Pop | def Remove(self): |
1500 | a2cfdea2 | Iustin Pop | """Stub remove for DRBD devices.
|
1501 | a2cfdea2 | Iustin Pop |
|
1502 | a2cfdea2 | Iustin Pop | """
|
1503 | a2cfdea2 | Iustin Pop | return self.Shutdown() |
1504 | a2cfdea2 | Iustin Pop | |
1505 | a2cfdea2 | Iustin Pop | @classmethod
|
1506 | a2cfdea2 | Iustin Pop | def Create(cls, unique_id, children, size): |
1507 | a2cfdea2 | Iustin Pop | """Create a new DRBD8 device.
|
1508 | a2cfdea2 | Iustin Pop |
|
1509 | a2cfdea2 | Iustin Pop | Since DRBD devices are not created per se, just assembled, this
|
1510 | a2cfdea2 | Iustin Pop | function only initializes the metadata.
|
1511 | a2cfdea2 | Iustin Pop |
|
1512 | a2cfdea2 | Iustin Pop | """
|
1513 | a2cfdea2 | Iustin Pop | if len(children) != 2: |
1514 | a2cfdea2 | Iustin Pop | raise errors.ProgrammerError("Invalid setup for the drbd device") |
1515 | 767d52d3 | Iustin Pop | # check that the minor is unused
|
1516 | 767d52d3 | Iustin Pop | aminor = unique_id[4]
|
1517 | 767d52d3 | Iustin Pop | proc_info = cls._MassageProcData(cls._GetProcData()) |
1518 | 767d52d3 | Iustin Pop | if aminor in proc_info: |
1519 | 767d52d3 | Iustin Pop | status = DRBD8Status(proc_info[aminor]) |
1520 | 767d52d3 | Iustin Pop | in_use = status.is_in_use |
1521 | 767d52d3 | Iustin Pop | else:
|
1522 | 767d52d3 | Iustin Pop | in_use = False
|
1523 | 767d52d3 | Iustin Pop | if in_use:
|
1524 | 767d52d3 | Iustin Pop | raise errors.BlockDeviceError("DRBD minor %d already in use at" |
1525 | 767d52d3 | Iustin Pop | " Create() time" % aminor)
|
1526 | a2cfdea2 | Iustin Pop | meta = children[1]
|
1527 | a2cfdea2 | Iustin Pop | meta.Assemble() |
1528 | a2cfdea2 | Iustin Pop | if not meta.Attach(): |
1529 | a2cfdea2 | Iustin Pop | raise errors.BlockDeviceError("Can't attach to meta device") |
1530 | a2cfdea2 | Iustin Pop | if not cls._CheckMetaSize(meta.dev_path): |
1531 | a2cfdea2 | Iustin Pop | raise errors.BlockDeviceError("Invalid meta device size") |
1532 | 3b559640 | Iustin Pop | cls._InitMeta(aminor, meta.dev_path) |
1533 | a2cfdea2 | Iustin Pop | return cls(unique_id, children)
|
1534 | a2cfdea2 | Iustin Pop | |
1535 | 1005d816 | Iustin Pop | def Grow(self, amount): |
1536 | 1005d816 | Iustin Pop | """Resize the DRBD device and its backing storage.
|
1537 | 1005d816 | Iustin Pop |
|
1538 | 1005d816 | Iustin Pop | """
|
1539 | 1005d816 | Iustin Pop | if self.minor is None: |
1540 | 1005d816 | Iustin Pop | raise errors.ProgrammerError("drbd8: Grow called while not attached") |
1541 | 1005d816 | Iustin Pop | if len(self._children) != 2 or None in self._children: |
1542 | 1005d816 | Iustin Pop | raise errors.BlockDeviceError("Cannot grow diskless DRBD8 device") |
1543 | 1005d816 | Iustin Pop | self._children[0].Grow(amount) |
1544 | 1005d816 | Iustin Pop | result = utils.RunCmd(["drbdsetup", self.dev_path, "resize"]) |
1545 | 1005d816 | Iustin Pop | if result.failed:
|
1546 | 1005d816 | Iustin Pop | raise errors.BlockDeviceError("resize failed for %s: %s" % |
1547 | 1005d816 | Iustin Pop | (self.dev_path, result.output))
|
1548 | 1005d816 | Iustin Pop | return
|
1549 | 1005d816 | Iustin Pop | |
1550 | a8083063 | Iustin Pop | |
1551 | 6f695a2e | Manuel Franceschini | class FileStorage(BlockDev): |
1552 | 6f695a2e | Manuel Franceschini | """File device.
|
1553 | abdf0113 | Iustin Pop |
|
1554 | 6f695a2e | Manuel Franceschini | This class represents the a file storage backend device.
|
1555 | 6f695a2e | Manuel Franceschini |
|
1556 | 6f695a2e | Manuel Franceschini | The unique_id for the file device is a (file_driver, file_path) tuple.
|
1557 | abdf0113 | Iustin Pop |
|
1558 | 6f695a2e | Manuel Franceschini | """
|
1559 | 6f695a2e | Manuel Franceschini | def __init__(self, unique_id, children): |
1560 | 6f695a2e | Manuel Franceschini | """Initalizes a file device backend.
|
1561 | 6f695a2e | Manuel Franceschini |
|
1562 | 6f695a2e | Manuel Franceschini | """
|
1563 | 6f695a2e | Manuel Franceschini | if children:
|
1564 | 6f695a2e | Manuel Franceschini | raise errors.BlockDeviceError("Invalid setup for file device") |
1565 | 6f695a2e | Manuel Franceschini | super(FileStorage, self).__init__(unique_id, children) |
1566 | 6f695a2e | Manuel Franceschini | if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
1567 | 6f695a2e | Manuel Franceschini | raise ValueError("Invalid configuration data %s" % str(unique_id)) |
1568 | 6f695a2e | Manuel Franceschini | self.driver = unique_id[0] |
1569 | 6f695a2e | Manuel Franceschini | self.dev_path = unique_id[1] |
1570 | ecb091e3 | Iustin Pop | self.Attach()
|
1571 | 6f695a2e | Manuel Franceschini | |
1572 | 6f695a2e | Manuel Franceschini | def Assemble(self): |
1573 | 6f695a2e | Manuel Franceschini | """Assemble the device.
|
1574 | 6f695a2e | Manuel Franceschini |
|
1575 | 6f695a2e | Manuel Franceschini | Checks whether the file device exists, raises BlockDeviceError otherwise.
|
1576 | 6f695a2e | Manuel Franceschini |
|
1577 | 6f695a2e | Manuel Franceschini | """
|
1578 | 6f695a2e | Manuel Franceschini | if not os.path.exists(self.dev_path): |
1579 | 6f695a2e | Manuel Franceschini | raise errors.BlockDeviceError("File device '%s' does not exist." % |
1580 | 6f695a2e | Manuel Franceschini | self.dev_path)
|
1581 | 6f695a2e | Manuel Franceschini | return True |
1582 | 6f695a2e | Manuel Franceschini | |
1583 | 6f695a2e | Manuel Franceschini | def Shutdown(self): |
1584 | 6f695a2e | Manuel Franceschini | """Shutdown the device.
|
1585 | 6f695a2e | Manuel Franceschini |
|
1586 | 6f695a2e | Manuel Franceschini | This is a no-op for the file type, as we don't deacivate
|
1587 | 6f695a2e | Manuel Franceschini | the file on shutdown.
|
1588 | 6f695a2e | Manuel Franceschini |
|
1589 | 6f695a2e | Manuel Franceschini | """
|
1590 | 6f695a2e | Manuel Franceschini | return True |
1591 | 6f695a2e | Manuel Franceschini | |
1592 | 6f695a2e | Manuel Franceschini | def Open(self, force=False): |
1593 | 6f695a2e | Manuel Franceschini | """Make the device ready for I/O.
|
1594 | 6f695a2e | Manuel Franceschini |
|
1595 | 6f695a2e | Manuel Franceschini | This is a no-op for the file type.
|
1596 | 6f695a2e | Manuel Franceschini |
|
1597 | 6f695a2e | Manuel Franceschini | """
|
1598 | 6f695a2e | Manuel Franceschini | pass
|
1599 | 6f695a2e | Manuel Franceschini | |
1600 | 6f695a2e | Manuel Franceschini | def Close(self): |
1601 | 6f695a2e | Manuel Franceschini | """Notifies that the device will no longer be used for I/O.
|
1602 | 6f695a2e | Manuel Franceschini |
|
1603 | 6f695a2e | Manuel Franceschini | This is a no-op for the file type.
|
1604 | 6f695a2e | Manuel Franceschini |
|
1605 | 6f695a2e | Manuel Franceschini | """
|
1606 | 6f695a2e | Manuel Franceschini | pass
|
1607 | 6f695a2e | Manuel Franceschini | |
1608 | 6f695a2e | Manuel Franceschini | def Remove(self): |
1609 | 6f695a2e | Manuel Franceschini | """Remove the file backing the block device.
|
1610 | 6f695a2e | Manuel Franceschini |
|
1611 | c41eea6e | Iustin Pop | @rtype: boolean
|
1612 | c41eea6e | Iustin Pop | @return: True if the removal was successful
|
1613 | 6f695a2e | Manuel Franceschini |
|
1614 | 6f695a2e | Manuel Franceschini | """
|
1615 | 6f695a2e | Manuel Franceschini | if not os.path.exists(self.dev_path): |
1616 | 6f695a2e | Manuel Franceschini | return True |
1617 | 6f695a2e | Manuel Franceschini | try:
|
1618 | 6f695a2e | Manuel Franceschini | os.remove(self.dev_path)
|
1619 | 6f695a2e | Manuel Franceschini | return True |
1620 | 6f695a2e | Manuel Franceschini | except OSError, err: |
1621 | 468c5f77 | Iustin Pop | logging.error("Can't remove file '%s': %s", self.dev_path, err) |
1622 | 6f695a2e | Manuel Franceschini | return False |
1623 | 6f695a2e | Manuel Franceschini | |
1624 | 6f695a2e | Manuel Franceschini | def Attach(self): |
1625 | 6f695a2e | Manuel Franceschini | """Attach to an existing file.
|
1626 | 6f695a2e | Manuel Franceschini |
|
1627 | 6f695a2e | Manuel Franceschini | Check if this file already exists.
|
1628 | 6f695a2e | Manuel Franceschini |
|
1629 | c41eea6e | Iustin Pop | @rtype: boolean
|
1630 | c41eea6e | Iustin Pop | @return: True if file exists
|
1631 | 6f695a2e | Manuel Franceschini |
|
1632 | 6f695a2e | Manuel Franceschini | """
|
1633 | ecb091e3 | Iustin Pop | self.attached = os.path.exists(self.dev_path) |
1634 | ecb091e3 | Iustin Pop | return self.attached |
1635 | 6f695a2e | Manuel Franceschini | |
1636 | 6f695a2e | Manuel Franceschini | @classmethod
|
1637 | 6f695a2e | Manuel Franceschini | def Create(cls, unique_id, children, size): |
1638 | 6f695a2e | Manuel Franceschini | """Create a new file.
|
1639 | 6f695a2e | Manuel Franceschini |
|
1640 | c41eea6e | Iustin Pop | @param size: the size of file in MiB
|
1641 | 6f695a2e | Manuel Franceschini |
|
1642 | c41eea6e | Iustin Pop | @rtype: L{bdev.FileStorage}
|
1643 | c41eea6e | Iustin Pop | @return: an instance of FileStorage
|
1644 | 6f695a2e | Manuel Franceschini |
|
1645 | 6f695a2e | Manuel Franceschini | """
|
1646 | 6c626518 | Iustin Pop | # TODO: decide whether we should check for existing files and
|
1647 | 6c626518 | Iustin Pop | # abort or not
|
1648 | 6f695a2e | Manuel Franceschini | if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
1649 | 6f695a2e | Manuel Franceschini | raise ValueError("Invalid configuration data %s" % str(unique_id)) |
1650 | 6f695a2e | Manuel Franceschini | dev_path = unique_id[1]
|
1651 | 6f695a2e | Manuel Franceschini | try:
|
1652 | 6f695a2e | Manuel Franceschini | f = open(dev_path, 'w') |
1653 | 6f695a2e | Manuel Franceschini | f.truncate(size * 1024 * 1024) |
1654 | 6f695a2e | Manuel Franceschini | f.close() |
1655 | 6c626518 | Iustin Pop | except IOError, err: |
1656 | 6c626518 | Iustin Pop | raise errors.BlockDeviceError("Error in file creation: %" % str(err)) |
1657 | 6f695a2e | Manuel Franceschini | |
1658 | 6f695a2e | Manuel Franceschini | return FileStorage(unique_id, children)
|
1659 | 6f695a2e | Manuel Franceschini | |
1660 | 6f695a2e | Manuel Franceschini | |
1661 | a8083063 | Iustin Pop | DEV_MAP = { |
1662 | fe96220b | Iustin Pop | constants.LD_LV: LogicalVolume, |
1663 | a1f445d3 | Iustin Pop | constants.LD_DRBD8: DRBD8, |
1664 | 6f695a2e | Manuel Franceschini | constants.LD_FILE: FileStorage, |
1665 | a8083063 | Iustin Pop | } |
1666 | a8083063 | Iustin Pop | |
1667 | a8083063 | Iustin Pop | |
1668 | a8083063 | Iustin Pop | def FindDevice(dev_type, unique_id, children): |
1669 | a8083063 | Iustin Pop | """Search for an existing, assembled device.
|
1670 | a8083063 | Iustin Pop |
|
1671 | a8083063 | Iustin Pop | This will succeed only if the device exists and is assembled, but it
|
1672 | a8083063 | Iustin Pop | does not do any actions in order to activate the device.
|
1673 | a8083063 | Iustin Pop |
|
1674 | a8083063 | Iustin Pop | """
|
1675 | a8083063 | Iustin Pop | if dev_type not in DEV_MAP: |
1676 | a8083063 | Iustin Pop | raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
1677 | a8083063 | Iustin Pop | device = DEV_MAP[dev_type](unique_id, children) |
1678 | cb999543 | Iustin Pop | if not device.attached: |
1679 | a8083063 | Iustin Pop | return None |
1680 | ecb091e3 | Iustin Pop | return device
|
1681 | a8083063 | Iustin Pop | |
1682 | a8083063 | Iustin Pop | |
1683 | f96e3c4f | Iustin Pop | def Assemble(dev_type, unique_id, children): |
1684 | a8083063 | Iustin Pop | """Try to attach or assemble an existing device.
|
1685 | a8083063 | Iustin Pop |
|
1686 | f96e3c4f | Iustin Pop | This will attach to assemble the device, as needed, to bring it
|
1687 | f96e3c4f | Iustin Pop | fully up. It must be safe to run on already-assembled devices.
|
1688 | a8083063 | Iustin Pop |
|
1689 | a8083063 | Iustin Pop | """
|
1690 | a8083063 | Iustin Pop | if dev_type not in DEV_MAP: |
1691 | a8083063 | Iustin Pop | raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
1692 | a8083063 | Iustin Pop | device = DEV_MAP[dev_type](unique_id, children) |
1693 | f96e3c4f | Iustin Pop | if not device.Assemble(): |
1694 | f96e3c4f | Iustin Pop | raise errors.BlockDeviceError("Can't find a valid block device for" |
1695 | f96e3c4f | Iustin Pop | " %s/%s/%s" %
|
1696 | f96e3c4f | Iustin Pop | (dev_type, unique_id, children)) |
1697 | a8083063 | Iustin Pop | return device
|
1698 | a8083063 | Iustin Pop | |
1699 | a8083063 | Iustin Pop | |
1700 | a8083063 | Iustin Pop | def Create(dev_type, unique_id, children, size): |
1701 | a8083063 | Iustin Pop | """Create a device.
|
1702 | a8083063 | Iustin Pop |
|
1703 | a8083063 | Iustin Pop | """
|
1704 | a8083063 | Iustin Pop | if dev_type not in DEV_MAP: |
1705 | a8083063 | Iustin Pop | raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
1706 | a8083063 | Iustin Pop | device = DEV_MAP[dev_type].Create(unique_id, children, size) |
1707 | a8083063 | Iustin Pop | return device |