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| author | Jonathan Brassow <jbrassow@redhat.com> | 2011-01-13 19:59:52 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2011-01-13 19:59:52 +0000 |
| commit | 86a54a4802df10d23ccd655e2083e812fe990243 (patch) | |
| tree | 168ccb5f1824e16fb55ac64e2d4754775aeaa958 /drivers/md | |
| parent | 085ae0651b2791f3a430ddb76da92925b9952e13 (diff) | |
| download | linux-3.10-86a54a4802df10d23ccd655e2083e812fe990243.tar.gz linux-3.10-86a54a4802df10d23ccd655e2083e812fe990243.tar.bz2 linux-3.10-86a54a4802df10d23ccd655e2083e812fe990243.zip | |
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.c | 6 | ||||
| -rw-r--r-- | drivers/md/dm-log-userspace-transfer.c | 1 |
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 31e1687e7bf..aa2e0c374ab 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 075cbcf8a9f..049eaf12aaa 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++; |