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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
parent085ae0651b2791f3a430ddb76da92925b9952e13 (diff)
downloadlinux-86a54a4802df10d23ccd655e2083e812fe990243.tar.bz2
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')
-rw-r--r--drivers/md/dm-log-userspace-base.c6
-rw-r--r--drivers/md/dm-log-userspace-transfer.c1
2 files changed, 5 insertions, 2 deletions
diff --git a/drivers/md/dm-log-userspace-base.c b/drivers/md/dm-log-userspace-base.c
index 31e1687e7bf6..aa2e0c374ab3 100644
--- a/drivers/md/dm-log-userspace-base.c
+++ b/drivers/md/dm-log-userspace-base.c
@@ -12,6 +12,8 @@
#include "dm-log-userspace-transfer.h"
+#define DM_LOG_USERSPACE_VSN "1.1.0"
+
struct flush_entry {
int type;
region_t region;
@@ -765,7 +767,7 @@ static int __init userspace_dirty_log_init(void)
return r;
}
- DMINFO("version 1.0.0 loaded");
+ DMINFO("version " DM_LOG_USERSPACE_VSN " loaded");
return 0;
}
@@ -775,7 +777,7 @@ static void __exit userspace_dirty_log_exit(void)
dm_ulog_tfr_exit();
mempool_destroy(flush_entry_pool);
- DMINFO("version 1.0.0 unloaded");
+ DMINFO("version " DM_LOG_USERSPACE_VSN " unloaded");
return;
}
diff --git a/drivers/md/dm-log-userspace-transfer.c b/drivers/md/dm-log-userspace-transfer.c
index 075cbcf8a9f5..049eaf12aaab 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++;