| commit | 5de0c0e50ad44269de9c756b21c5106f503d6df7 | |
| author | Matthew Dillon <dillon@dragonflybsd.org> | |
| Mon, 23 Jun 2008 21:42:48 +0000 (23 21:42 +0000) | ||
| committer | Matthew Dillon <dillon@dragonflybsd.org> | |
| Mon, 23 Jun 2008 21:42:48 +0000 (23 21:42 +0000) | ||
| tree | 6deca93d403aa9d70916bbfabec05371222f08ad | treesnapshot (tar.gz zip) |
| parent | b5aaba7fa11d32843096458fe5c0188ba7e49b26 | commitdiff |
HAMMER 58A/Many: Mirroring support part 1
* Implement mastership domains for transaction ids to support multi-master
mirroring and implement mastership selection at mount time.
Mastership domains work by having the low 4 bits of the transaction id
specify the mastership id (0-15). This allows the mirroring code to
distinguish between changes originating on a particular node and changes
mirrored from another node.
This also ensures that filesystem objects can be created on the mirrors
in parallel without resulting in conflicitng object ids.
* Eliminate time-based TID generation. Just increment the TID as
appropriate.
NOTE: Portions of this change may be reverted at a later time depending
on how the mirroring implementation proceeds.
* Minor code cleanups.
* Implement mastership domains for transaction ids to support multi-master
mirroring and implement mastership selection at mount time.
Mastership domains work by having the low 4 bits of the transaction id
specify the mastership id (0-15). This allows the mirroring code to
distinguish between changes originating on a particular node and changes
mirrored from another node.
This also ensures that filesystem objects can be created on the mirrors
in parallel without resulting in conflicitng object ids.
* Eliminate time-based TID generation. Just increment the TID as
appropriate.
NOTE: Portions of this change may be reverted at a later time depending
on how the mirroring implementation proceeds.
* Minor code cleanups.