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authorJonathan Brassow <jbrassow@redhat.com>2011-01-13 19:59:52 +0000
committerAlasdair G Kergon <agk@redhat.com>2011-01-13 19:59:52 +0000
commit86a54a4802df10d23ccd655e2083e812fe990243 (patch)
tree168ccb5f1824e16fb55ac64e2d4754775aeaa958 /drivers/md/dm-log-userspace-transfer.c
parent085ae0651b2791f3a430ddb76da92925b9952e13 (diff)
downloadop-kernel-dev-86a54a4802df10d23ccd655e2083e812fe990243.zip
op-kernel-dev-86a54a4802df10d23ccd655e2083e812fe990243.tar.gz
dm log userspace: add version number to comms
This patch adds a 'version' field to the 'dm_ulog_request' structure. The 'version' field is taken from a portion of the unused 'padding' field in the 'dm_ulog_request' structure. This was done to avoid changing the size of the structure and possibly disrupting backwards compatibility. The version number will help notify user-space daemons when a change has been made to the kernel/userspace log API. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-log-userspace-transfer.c')
-rw-r--r--drivers/md/dm-log-userspace-transfer.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/dm-log-userspace-transfer.c b/drivers/md/dm-log-userspace-transfer.c
index 075cbcf..049eaf1 100644
--- a/drivers/md/dm-log-userspace-transfer.c
+++ b/drivers/md/dm-log-userspace-transfer.c
@@ -198,6 +198,7 @@ resend:
memset(tfr, 0, DM_ULOG_PREALLOCED_SIZE - sizeof(struct cn_msg));
memcpy(tfr->uuid, uuid, DM_UUID_LEN);
+ tfr->version = DM_ULOG_REQUEST_VERSION;
tfr->luid = luid;
tfr->seq = dm_ulog_seq++;
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