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dm log userspace: add version number to comms

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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>
This commit is contained in:
Jonathan Brassow
2011-01-13 19:59:52 +00:00
committed by Alasdair G Kergon
parent 085ae0651b
commit 86a54a4802
3 changed files with 17 additions and 3 deletions
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6
drivers/md/dm-log-userspace-base.c
View File

@@ -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;
}

1
drivers/md/dm-log-userspace-transfer.c
View File

@@ -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++;