Revision 2d0c8319 lib/bdev.py
| b/lib/bdev.py | ||
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| 1321 | 1321 |
"C", dual_pri=multimaster) |
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def Attach(self): |
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"""Find a DRBD device which matches our config and attach to it. |
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"""Check if our minor is configured. |
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This doesn't do any device configurations - it only checks if the |
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minor is in a state different from Unconfigured. |
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Note that this function will not change the state of the system in |
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any way (except in case of side-effects caused by reading from |
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/proc). |
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""" |
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used_devs = self._GetUsedDevs() |
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if self._aminor in used_devs: |
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minor = self._aminor |
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else: |
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minor = None |
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self._SetFromMinor(minor) |
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return minor is not None |
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def Assemble(self): |
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"""Assemble the drbd. |
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Method: |
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- if we have a configured device, we try to ensure that it matches |
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our config |
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- if not, we create it from zero |
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""" |
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result = super(DRBD8, self).Assemble() |
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if not result: |
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return result |
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self.Attach() |
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if self.minor is None: |
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# local device completely unconfigured |
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return self._FastAssemble() |
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else: |
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# we have to recheck the local and network status and try to fix |
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# the device |
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return self._SlowAssemble() |
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def _SlowAssemble(self): |
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"""Assembles the DRBD device from a (partially) configured device. |
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In case of partially attached (local device matches but no network |
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setup), we perform the network attach. If successful, we re-test |
| ... | ... | |
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self._SetFromMinor(minor) |
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return minor is not None |
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def Assemble(self): |
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"""Assemble the drbd. |
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def _FastAssemble(self):
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"""Assemble the drbd device from zero.
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Method: |
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- if we have a local backing device, we bind to it by: |
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- checking the list of used drbd devices |
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- check if the local minor use of any of them is our own device |
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- if yes, abort? |
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- if not, bind |
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- if we have a local/remote net info: |
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- redo the local backing device step for the remote device |
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- check if any drbd device is using the local port, |
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if yes abort |
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- check if any remote drbd device is using the remote |
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port, if yes abort (for now) |
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- bind our net port |
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- bind the remote net port |
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This is run when in Assemble we detect our minor is unused. |
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""" |
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self.Attach() |
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if self.minor is not None: |
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logging.info("Already assembled")
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return True |
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result = super(DRBD8, self).Assemble() |
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if not result: |
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return result |
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# TODO: maybe completely tear-down the minor (drbdsetup ... down) |
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# before attaching our own? |
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minor = self._aminor |
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