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[PATCH] knfsd: lockd: Make nlm_host_rebooted use the nsm_handle

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This patch makes the SM_NOTIFY handling understand and use the nsm_handle.

To make it a bit clear what is happening:

    nlmclent_prepare_reclaim and nlmclnt_finish_reclaim
    get open-coded into 'reclaimer'

The result is tidied up.

Then some of that functionality is moved out into nlm_host_rebooted (which
calls nlmclnt_recovery which starts a thread which runs reclaimer).

Also host_rebooted now finds an nsm_handle rather than a host, then then
iterates over all hosts and deals with each host that shares that nsm_handle.

Signed-off-by: Olaf Kirch <okir@suse.de>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Olaf Kirch 2006-10-04 02:15:55 -07:00 committed by Linus Torvalds
parent f0737a39a6
commit 5c8dd29ca7
5 changed files with 69 additions and 57 deletions
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55
fs/lockd/clntlock.c
View file

@ -143,44 +143,13 @@ u32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *lock)
* server crash.
*/
/*
* Someone has sent us an SM_NOTIFY. Ensure we bind to the new port number,
* that we mark locks for reclaiming, and that we bump the pseudo NSM state.
*/
static void nlmclnt_prepare_reclaim(struct nlm_host *host)
{
down_write(&host->h_rwsem);
if (host->h_nsmhandle)
host->h_nsmhandle->sm_monitored = 0;
host->h_state++;
host->h_nextrebind = 0;
nlm_rebind_host(host);
/*
* Mark the locks for reclaiming.
*/
list_splice_init(&host->h_granted, &host->h_reclaim);
dprintk("NLM: reclaiming locks for host %s\n", host->h_name);
}
static void nlmclnt_finish_reclaim(struct nlm_host *host)
{
host->h_reclaiming = 0;
up_write(&host->h_rwsem);
dprintk("NLM: done reclaiming locks for host %s", host->h_name);
}
/*
* Reclaim all locks on server host. We do this by spawning a separate
* reclaimer thread.
*/
void
nlmclnt_recovery(struct nlm_host *host, u32 newstate)
nlmclnt_recovery(struct nlm_host *host)
{
if (host->h_nsmstate == newstate)
return;
host->h_nsmstate = newstate;
if (!host->h_reclaiming++) {
nlm_get_host(host);
__module_get(THIS_MODULE);
@ -200,18 +169,30 @@ reclaimer(void *ptr)
daemonize("%s-reclaim", host->h_name);
allow_signal(SIGKILL);
down_write(&host->h_rwsem);
/* This one ensures that our parent doesn't terminate while the
* reclaim is in progress */
lock_kernel();
lockd_up(0); /* note: this cannot fail as lockd is already running */
nlmclnt_prepare_reclaim(host);
/* First, reclaim all locks that have been marked. */
dprintk("lockd: reclaiming locks for host %s", host->h_name);
restart:
nsmstate = host->h_nsmstate;
/* Force a portmap getport - the peer's lockd will
* most likely end up on a different port.
*/
host->h_nextrebind = 0;
nlm_rebind_host(host);
/* First, reclaim all locks that have been granted. */
list_splice_init(&host->h_granted, &host->h_reclaim);
list_for_each_entry_safe(fl, next, &host->h_reclaim, fl_u.nfs_fl.list) {
list_del_init(&fl->fl_u.nfs_fl.list);
/* Why are we leaking memory here? --okir */
if (signalled())
continue;
if (nlmclnt_reclaim(host, fl) != 0)
@ -219,11 +200,13 @@ reclaimer(void *ptr)
list_add_tail(&fl->fl_u.nfs_fl.list, &host->h_granted);
if (host->h_nsmstate != nsmstate) {
/* Argh! The server rebooted again! */
list_splice_init(&host->h_granted, &host->h_reclaim);
goto restart;
}
}
nlmclnt_finish_reclaim(host);
host->h_reclaiming = 0;
up_write(&host->h_rwsem);
dprintk("NLM: done reclaiming locks for host %s", host->h_name);
/* Now, wake up all processes that sleep on a blocked lock */
list_for_each_entry(block, &nlm_blocked, b_list) {

59
fs/lockd/host.c
View file

@ -290,28 +290,57 @@ void nlm_release_host(struct nlm_host *host)
* has rebooted.
* Release all resources held by that peer.
*/
void nlm_host_rebooted(const struct sockaddr_in *sin, const struct nlm_reboot *argp)
void nlm_host_rebooted(const struct sockaddr_in *sin,
const char *hostname, int hostname_len,
u32 new_state)
{
struct nlm_host *host;
int server;
struct nsm_handle *nsm;
struct nlm_host *host, **hp;
int hash;
/* Obtain the host pointer for this NFS server and try to
* reclaim all locks we hold on this server.
*/
server = (argp->proto & 1)? 1 : 0;
host = nlm_lookup_host(server, sin, argp->proto >> 1, argp->vers,
argp->mon, argp->len);
if (host == NULL)
dprintk("lockd: nlm_host_rebooted(%s, %u.%u.%u.%u)\n",
hostname, NIPQUAD(sin->sin_addr));
/* Find the NSM handle for this peer */
if (!(nsm = __nsm_find(sin, hostname, hostname_len, 0)))
return;
if (server == 0) {
/* We are client, he's the server: try to reclaim all locks. */
nlmclnt_recovery(host, argp->state);
} else {
/* He's the client, we're the server: delete all locks held by the client */
/* When reclaiming locks on this peer, make sure that
* we set up a new notification */
nsm->sm_monitored = 0;
/* Mark all hosts tied to this NSM state as having rebooted.
* We run the loop repeatedly, because we drop the host table
* lock for this.
* To avoid processing a host several times, we match the nsmstate.
*/
again: mutex_lock(&nlm_host_mutex);
for (hash = 0; hash < NLM_HOST_NRHASH; hash++) {
for (hp = &nlm_hosts[hash]; (host = *hp); hp = &host->h_next) {
if (host->h_nsmhandle == nsm
&& host->h_nsmstate != new_state) {
host->h_nsmstate = new_state;
host->h_state++;
nlm_get_host(host);
mutex_unlock(&nlm_host_mutex);
if (host->h_server) {
/* We're server for this guy, just ditch
* all the locks he held. */
nlmsvc_free_host_resources(host);
} else {
/* He's the server, initiate lock recovery. */
nlmclnt_recovery(host);
}
nlm_release_host(host);
goto again;
}
}
}
mutex_unlock(&nlm_host_mutex);
}
/*

2
fs/lockd/svc4proc.c
View file

@ -438,7 +438,7 @@ nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
*/
memset(&saddr, 0, sizeof(saddr));
saddr.sin_addr.s_addr = argp->addr;
nlm_host_rebooted(&saddr, argp);
nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
return rpc_success;
}

2
fs/lockd/svcproc.c
View file

@ -467,7 +467,7 @@ nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
*/
memset(&saddr, 0, sizeof(saddr));
saddr.sin_addr.s_addr = argp->addr;
nlm_host_rebooted(&saddr, argp);
nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
return rpc_success;
}

4
include/linux/lockd/lockd.h
View file

@ -164,7 +164,7 @@ struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock
void nlmclnt_finish_block(struct nlm_wait *block);
int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout);
u32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *);
void nlmclnt_recovery(struct nlm_host *, u32);
void nlmclnt_recovery(struct nlm_host *);
int nlmclnt_reclaim(struct nlm_host *, struct file_lock *);
/*
@ -179,7 +179,7 @@ struct nlm_host * nlm_get_host(struct nlm_host *);
void nlm_release_host(struct nlm_host *);
void nlm_shutdown_hosts(void);
extern struct nlm_host *nlm_find_client(void);
extern void nlm_host_rebooted(const struct sockaddr_in *, const struct nlm_reboot *);
extern void nlm_host_rebooted(const struct sockaddr_in *, const char *, int, u32);
struct nsm_handle *nsm_find(const struct sockaddr_in *, const char *, int);
void nsm_release(struct nsm_handle *);