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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-06-09 09:40:27 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-06-09 09:40:27 -0400
commit28df955a2ad484d602314b30183ea8496a9aa34a (patch)
treec62632b2a0a49df114283f10764244c1b1b5f506
parent5046791417dcac1ba126b77b8062af15a2f0b8e1 (diff)
downloadlinux-linaro-28df955a2ad484d602314b30183ea8496a9aa34a.tar.gz
NLM: Fix reclaim races
Currently it is possible for a task to remove its locks at the same time as the NLM recovery thread is trying to recover them. This quickly leads to an Oops. Protect the locks using an rw semaphore while they are being recovered. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/lockd/clntlock.c39
-rw-r--r--fs/lockd/clntproc.c14
-rw-r--r--fs/lockd/host.c1
-rw-r--r--include/linux/lockd/lockd.h1
4 files changed, 40 insertions, 15 deletions
diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
index bce74446870..52774feab93 100644
--- a/fs/lockd/clntlock.c
+++ b/fs/lockd/clntlock.c
@@ -147,11 +147,10 @@ u32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *lock)
* 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 inline
-void nlmclnt_prepare_reclaim(struct nlm_host *host, u32 newstate)
+static void nlmclnt_prepare_reclaim(struct nlm_host *host)
{
+ down_write(&host->h_rwsem);
host->h_monitored = 0;
- host->h_nsmstate = newstate;
host->h_state++;
host->h_nextrebind = 0;
nlm_rebind_host(host);
@@ -164,6 +163,13 @@ void nlmclnt_prepare_reclaim(struct nlm_host *host, u32 newstate)
dprintk("NLM: reclaiming locks for host %s", 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.
@@ -171,12 +177,10 @@ void nlmclnt_prepare_reclaim(struct nlm_host *host, u32 newstate)
void
nlmclnt_recovery(struct nlm_host *host, u32 newstate)
{
- if (host->h_reclaiming++) {
- if (host->h_nsmstate == newstate)
- return;
- nlmclnt_prepare_reclaim(host, newstate);
- } else {
- nlmclnt_prepare_reclaim(host, newstate);
+ if (host->h_nsmstate == newstate)
+ return;
+ host->h_nsmstate = newstate;
+ if (!host->h_reclaiming++) {
nlm_get_host(host);
__module_get(THIS_MODULE);
if (kernel_thread(reclaimer, host, CLONE_KERNEL) < 0)
@@ -190,6 +194,7 @@ reclaimer(void *ptr)
struct nlm_host *host = (struct nlm_host *) ptr;
struct nlm_wait *block;
struct file_lock *fl, *next;
+ u32 nsmstate;
daemonize("%s-reclaim", host->h_name);
allow_signal(SIGKILL);
@@ -199,19 +204,25 @@ reclaimer(void *ptr)
lock_kernel();
lockd_up();
+ nlmclnt_prepare_reclaim(host);
/* First, reclaim all locks that have been marked. */
restart:
+ nsmstate = host->h_nsmstate;
list_for_each_entry_safe(fl, next, &host->h_reclaim, fl_u.nfs_fl.list) {
list_del_init(&fl->fl_u.nfs_fl.list);
if (signalled())
continue;
- if (nlmclnt_reclaim(host, fl) == 0)
- list_add_tail(&fl->fl_u.nfs_fl.list, &host->h_granted);
- goto restart;
+ if (nlmclnt_reclaim(host, fl) != 0)
+ continue;
+ 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;
+ }
}
-
- host->h_reclaiming = 0;
+ nlmclnt_finish_reclaim(host);
/* Now, wake up all processes that sleep on a blocked lock */
list_for_each_entry(block, &nlm_blocked, b_list) {
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index f96e38155b5..4db62098d3f 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -508,7 +508,10 @@ nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
}
block = nlmclnt_prepare_block(host, fl);
+again:
for(;;) {
+ /* Reboot protection */
+ fl->fl_u.nfs_fl.state = host->h_state;
status = nlmclnt_call(req, NLMPROC_LOCK);
if (status < 0)
goto out_unblock;
@@ -531,10 +534,16 @@ nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
}
if (resp->status == NLM_LCK_GRANTED) {
- fl->fl_u.nfs_fl.state = host->h_state;
+ down_read(&host->h_rwsem);
+ /* Check whether or not the server has rebooted */
+ if (fl->fl_u.nfs_fl.state != host->h_state) {
+ up_read(&host->h_rwsem);
+ goto again;
+ }
fl->fl_flags |= FL_SLEEP;
/* Ensure the resulting lock will get added to granted list */
do_vfs_lock(fl);
+ up_read(&host->h_rwsem);
}
status = nlm_stat_to_errno(resp->status);
out_unblock:
@@ -596,6 +605,7 @@ nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl)
static int
nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
{
+ struct nlm_host *host = req->a_host;
struct nlm_res *resp = &req->a_res;
int status;
@@ -604,7 +614,9 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
* request, or to deny it with NLM_LCK_DENIED_GRACE_PERIOD. In either
* case, we want to unlock.
*/
+ down_read(&host->h_rwsem);
do_vfs_lock(fl);
+ up_read(&host->h_rwsem);
if (req->a_flags & RPC_TASK_ASYNC)
return nlm_async_call(req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index 5242743c940..38b0e8a1aec 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -117,6 +117,7 @@ nlm_lookup_host(int server, struct sockaddr_in *sin,
host->h_expires = jiffies + NLM_HOST_EXPIRE;
atomic_set(&host->h_count, 1);
init_waitqueue_head(&host->h_gracewait);
+ init_rwsem(&host->h_rwsem);
host->h_state = 0; /* pseudo NSM state */
host->h_nsmstate = 0; /* real NSM state */
host->h_server = server;
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index a6c1a33e5ae..6b2684763fc 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -50,6 +50,7 @@ struct nlm_host {
h_killed : 1,
h_monitored : 1;
wait_queue_head_t h_gracewait; /* wait while reclaiming */
+ struct rw_semaphore h_rwsem; /* Reboot recovery lock */
u32 h_state; /* pseudo-state counter */
u32 h_nsmstate; /* true remote NSM state */
u32 h_pidcount; /* Pseudopids */