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| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2009-09-23 03:49:27 +0400 |
|---|---|---|
| committer | Anton Vorontsov <avorontsov@ru.mvista.com> | 2009-09-23 03:49:27 +0400 |
| commit | f056878332a91ed984a116bad4e7d49aefff9e6e (patch) | |
| tree | 572f4757c8e7811d45e0be0c2ae529c78fb63441 /include/linux/dm-log-userspace.h | |
| parent | 3961f7c3cf247eee5df7fabadc7a40f2deeb98f3 (diff) | |
| parent | 7fa07729e439a6184bd824746d06a49cca553f15 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
drivers/power/wm97xx_battery.c
Diffstat (limited to 'include/linux/dm-log-userspace.h')
| -rw-r--r-- | include/linux/dm-log-userspace.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/dm-log-userspace.h b/include/linux/dm-log-userspace.h index 642e3017b51f..8a1f972c0fe9 100644 --- a/include/linux/dm-log-userspace.h +++ b/include/linux/dm-log-userspace.h @@ -371,7 +371,18 @@ (DM_ULOG_REQUEST_MASK & (request_type)) struct dm_ulog_request { - char uuid[DM_UUID_LEN]; /* Ties a request to a specific mirror log */ + /* + * The local unique identifier (luid) and the universally unique + * identifier (uuid) are used to tie a request to a specific + * mirror log. A single machine log could probably make due with + * just the 'luid', but a cluster-aware log must use the 'uuid' and + * the 'luid'. The uuid is what is required for node to node + * communication concerning a particular log, but the 'luid' helps + * differentiate between logs that are being swapped and have the + * same 'uuid'. (Think "live" and "inactive" device-mapper tables.) + */ + uint64_t luid; + char uuid[DM_UUID_LEN]; char padding[7]; /* Padding because DM_UUID_LEN = 129 */ int32_t error; /* Used to report back processing errors */ |