lockd: Remove BKL from the client
This patch removes all calls to lock_kernel() from the client. This patch
should be applied after the "fs/lock.c prepare for BKL removal" patch submitted
by Arnd Bergmann on September 18.
Signed-off-by: Bryan Schumaker <bjschuma@xxxxxxxxxx>
---
diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
index 64fd427..d5bb868 100644
--- a/fs/lockd/clntlock.c
+++ b/fs/lockd/clntlock.c
@@ -42,6 +42,7 @@ struct nlm_wait {
};
static LIST_HEAD(nlm_blocked);
+static DEFINE_SPINLOCK(nlm_blocked_lock);
/**
* nlmclnt_init - Set up per-NFS mount point lockd data structures
@@ -97,7 +98,10 @@ struct nlm_wait *nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *
block->b_lock = fl;
init_waitqueue_head(&block->b_wait);
block->b_status = nlm_lck_blocked;
+
+ spin_lock(&nlm_blocked_lock);
list_add(&block->b_list, &nlm_blocked);
+ spin_unlock(&nlm_blocked_lock);
}
return block;
}
@@ -106,7 +110,9 @@ void nlmclnt_finish_block(struct nlm_wait *block)
{
if (block == NULL)
return;
+ spin_lock(&nlm_blocked_lock);
list_del(&block->b_list);
+ spin_unlock(&nlm_blocked_lock);
kfree(block);
}
@@ -154,6 +160,7 @@ __be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock)
* Look up blocked request based on arguments.
* Warning: must not use cookie to match it!
*/
+ spin_lock(&nlm_blocked_lock);
list_for_each_entry(block, &nlm_blocked, b_list) {
struct file_lock *fl_blocked = block->b_lock;
@@ -178,6 +185,7 @@ __be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock)
wake_up(&block->b_wait);
res = nlm_granted;
}
+ spin_unlock(&nlm_blocked_lock);
return res;
}
@@ -216,10 +224,6 @@ reclaimer(void *ptr)
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(); /* note: this cannot fail as lockd is already running */
dprintk("lockd: reclaiming locks for host %s\n", host->h_name);
@@ -260,16 +264,17 @@ restart:
dprintk("NLM: done reclaiming locks for host %s\n", host->h_name);
/* Now, wake up all processes that sleep on a blocked lock */
+ spin_lock(&nlm_blocked_lock);
list_for_each_entry(block, &nlm_blocked, b_list) {
if (block->b_host == host) {
block->b_status = nlm_lck_denied_grace_period;
wake_up(&block->b_wait);
}
}
+ spin_unlock(&nlm_blocked_lock);
/* Release host handle after use */
nlm_release_host(host);
lockd_down();
- unlock_kernel();
return 0;
}
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 7932c39..47ea1e1 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -166,7 +166,6 @@ int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl)
/* Set up the argument struct */
nlmclnt_setlockargs(call, fl);
- lock_kernel();
if (IS_SETLK(cmd) || IS_SETLKW(cmd)) {
if (fl->fl_type != F_UNLCK) {
call->a_args.block = IS_SETLKW(cmd) ? 1 : 0;
@@ -177,10 +176,8 @@ int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl)
status = nlmclnt_test(call, fl);
else
status = -EINVAL;
-
fl->fl_ops->fl_release_private(fl);
fl->fl_ops = NULL;
- unlock_kernel();
dprintk("lockd: clnt proc returns %d\n", status);
return status;
@@ -226,9 +223,7 @@ void nlm_release_call(struct nlm_rqst *call)
static void nlmclnt_rpc_release(void *data)
{
- lock_kernel();
nlm_release_call(data);
- unlock_kernel();
}
static int nlm_wait_on_grace(wait_queue_head_t *queue)
@@ -448,14 +443,18 @@ out:
static void nlmclnt_locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
+ spin_lock(&fl->fl_u.nfs_fl.owner->host->h_lock);
new->fl_u.nfs_fl.state = fl->fl_u.nfs_fl.state;
new->fl_u.nfs_fl.owner = nlm_get_lockowner(fl->fl_u.nfs_fl.owner);
list_add_tail(&new->fl_u.nfs_fl.list, &fl->fl_u.nfs_fl.owner->host->h_granted);
+ spin_unlock(&fl->fl_u.nfs_fl.owner->host->h_lock);
}
static void nlmclnt_locks_release_private(struct file_lock *fl)
{
+ spin_lock(&fl->fl_u.nfs_fl.owner->host->h_lock);
list_del(&fl->fl_u.nfs_fl.list);
+ spin_unlock(&fl->fl_u.nfs_fl.owner->host->h_lock);
nlm_put_lockowner(fl->fl_u.nfs_fl.owner);
}
@@ -721,9 +720,7 @@ static void nlmclnt_unlock_callback(struct rpc_task *task, void *data)
die:
return;
retry_rebind:
- lock_kernel();
nlm_rebind_host(req->a_host);
- unlock_kernel();
retry_unlock:
rpc_restart_call(task);
}
@@ -801,9 +798,7 @@ retry_cancel:
/* Don't ever retry more than 3 times */
if (req->a_retries++ >= NLMCLNT_MAX_RETRIES)
goto die;
- lock_kernel();
nlm_rebind_host(req->a_host);
- unlock_kernel();
rpc_restart_call(task);
rpc_delay(task, 30 * HZ);
}
--
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