Clean up: A few minor clean-ups for nsm_monitor():
o Make sure to return an error if the SM_MON call result is not zero.
o Remove the BUG_ON() -- the code will die anyway if nsm is NULL.
o Use nsm->sm_name instead of host->h_name to be consistent with
other functions in fs/lockd/mon.c.
o Collect the public declaration of nsm_monitor() in lockd.h with
other NSM public function declarations (eg. nsm_release).
o Add documenting comments.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/lockd/mon.c | 29 ++++++++++++++++++-----------
include/linux/lockd/lockd.h | 4 ++++
include/linux/lockd/sm_inter.h | 1 -
3 files changed, 22 insertions(+), 12 deletions(-)
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index a606fbb..78d5f59 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -69,18 +69,24 @@ nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
return status;
}
-/*
- * Set up monitoring of a remote host
+/**
+ * nsm_monitor - Notify a peer in case we reboot
+ * @host: pointer to nlm_host of peer to notify
+ *
+ * If this peer is not already monitored, this function sends an
+ * upcall to the local rpc.statd to record the name/address of
+ * the peer to notify in case we reboot.
+ *
+ * Returns zero if the peer is monitored by the local rpc.statd;
+ * otherwise a negative errno value is returned.
*/
-int
-nsm_monitor(struct nlm_host *host)
+int nsm_monitor(const struct nlm_host *host)
{
struct nsm_handle *nsm = host->h_nsmhandle;
- struct nsm_res res;
- int status;
+ struct nsm_res res;
+ int status;
- dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
- BUG_ON(nsm == NULL);
+ dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
if (nsm->sm_monitored)
return 0;
@@ -92,9 +98,10 @@ nsm_monitor(struct nlm_host *host)
nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
status = nsm_mon_unmon(nsm, SM_MON, &res);
-
- if (status < 0 || res.status != 0)
- printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
+ if (res.status != 0)
+ status = -EIO;
+ if (status < 0)
+ printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
else
nsm->sm_monitored = 1;
return status;
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index de9ea7b..4ca6f39 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -233,6 +233,10 @@ extern void nlm_host_rebooted(const struct sockaddr_in *, const char *,
unsigned int, u32);
void nsm_release(struct nsm_handle *);
+/*
+ * Host monitoring
+ */
+int nsm_monitor(const struct nlm_host *host);
/*
* This is used in garbage collection and resource reclaim
diff --git a/include/linux/lockd/sm_inter.h b/include/linux/lockd/sm_inter.h
index 5a5448b..546b610 100644
--- a/include/linux/lockd/sm_inter.h
+++ b/include/linux/lockd/sm_inter.h
@@ -41,7 +41,6 @@ struct nsm_res {
u32 state;
};
-int nsm_monitor(struct nlm_host *);
int nsm_unmonitor(struct nlm_host *);
extern int nsm_local_state;
--
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