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NSM: Release nsmhandle in nlm_destroy_host 

The nsm_handle's reference count is bumped in nlm_lookup_host().  It
should be decremented in nlm_destroy_host() to make it easier to see
the balance of these two operations.

Move the nsm_release() call to fs/lockd/host.c.

The h_nsmhandle pointer is set in nlm_lookup_host(), and never cleared.
The nlm_destroy_host() function is never called for the same nlm_host
twice, so h_nsmhandle won't ever be NULL when nsm_unmonitor() is
called.

All references to the nlm_host are gone before it is freed.  We can
skip making h_nsmhandle NULL just before the nlm_host is deallocated.

It's also likely we can remove the h_nsmhandle NULL check in
nlmsvc_is_client() as well, but we can do that later when rearchitect-
ing the nlm_host cache.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Chuck Lever 2008-12-04 14:21:31 -05:00 committed by J. Bruce Fields
parent 1e49323c4a
commit c8c23c423d
3 changed files with 3 additions and 11 deletions
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8
fs/lockd/host.c
View File

@ -37,6 +37,7 @@ static struct nsm_handle *nsm_find(const struct sockaddr *sap,
const char *hostname,
const size_t hostname_len,
const int create);
static void nsm_release(struct nsm_handle *nsm);
struct nlm_lookup_host_info {
const int server; /* search for server|client */
@ -263,10 +264,8 @@ nlm_destroy_host(struct nlm_host *host)
BUG_ON(!list_empty(&host->h_lockowners));
BUG_ON(atomic_read(&host->h_count));
/*
* Release NSM handle and unmonitor host.
*/
nsm_unmonitor(host);
nsm_release(host->h_nsmhandle);
clnt = host->h_rpcclnt;
if (clnt != NULL)
@ -711,8 +710,7 @@ static struct nsm_handle *nsm_find(const struct sockaddr *sap,
/*
* Release an NSM handle
*/
void
nsm_release(struct nsm_handle *nsm)
static void nsm_release(struct nsm_handle *nsm)
{
if (!nsm)
return;

5
fs/lockd/mon.c
View File

@ -117,10 +117,6 @@ nsm_unmonitor(struct nlm_host *host)
struct nsm_res res;
int status = 0;
if (nsm == NULL)
return 0;
host->h_nsmhandle = NULL;
if (atomic_read(&nsm->sm_count) == 1
&& nsm->sm_monitored && !nsm->sm_sticky) {
dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
@ -132,7 +128,6 @@ nsm_unmonitor(struct nlm_host *host)
else
nsm->sm_monitored = 0;
}
nsm_release(nsm);
return status;
}

1
include/linux/lockd/lockd.h
View File

@ -240,7 +240,6 @@ void nlm_release_host(struct nlm_host *);
void nlm_shutdown_hosts(void);
extern void nlm_host_rebooted(const struct sockaddr_in *, const char *,
unsigned int, u32);
void nsm_release(struct nsm_handle *);
/*
* Host monitoring