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lockd: Mostly remove BKL from the server 

This patch removes all but one call to lock_kernel() from the server.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Bryan Schumaker 2010-09-21 16:38:12 -04:00 committed by J. Bruce Fields
parent e7f483eabe
commit f904be9cc7
3 changed files with 21 additions and 14 deletions
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2
fs/lockd/svc4proc.c
View File

@ -230,9 +230,7 @@ static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
static void nlm4svc_callback_release(void *data)
{
lock_kernel();
nlm_release_call(data);
unlock_kernel();
}
static const struct rpc_call_ops nlm4svc_callback_ops = {

31
fs/lockd/svclock.c
View File

@ -52,12 +52,13 @@ static const struct rpc_call_ops nlmsvc_grant_ops;
* The list of blocked locks to retry
*/
static LIST_HEAD(nlm_blocked);
static DEFINE_SPINLOCK(nlm_blocked_lock);
/*
* Insert a blocked lock into the global list
*/
static void
nlmsvc_insert_block(struct nlm_block *block, unsigned long when)
nlmsvc_insert_block_locked(struct nlm_block *block, unsigned long when)
{
struct nlm_block *b;
struct list_head *pos;
@ -87,6 +88,13 @@ nlmsvc_insert_block(struct nlm_block *block, unsigned long when)
block->b_when = when;
}
static void nlmsvc_insert_block(struct nlm_block *block, unsigned long when)
{
spin_lock(&nlm_blocked_lock);
nlmsvc_insert_block_locked(block, when);
spin_unlock(&nlm_blocked_lock);
}
/*
* Remove a block from the global list
*/
@ -94,7 +102,9 @@ static inline void
nlmsvc_remove_block(struct nlm_block *block)
{
if (!list_empty(&block->b_list)) {
spin_lock(&nlm_blocked_lock);
list_del_init(&block->b_list);
spin_unlock(&nlm_blocked_lock);
nlmsvc_release_block(block);
}
}
@ -651,7 +661,7 @@ static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf,
struct nlm_block *block;
int rc = -ENOENT;
lock_kernel();
spin_lock(&nlm_blocked_lock);
list_for_each_entry(block, &nlm_blocked, b_list) {
if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) {
dprintk("lockd: nlmsvc_notify_blocked block %p flags %d\n",
@ -665,13 +675,13 @@ static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf,
} else if (result == 0)
block->b_granted = 1;
nlmsvc_insert_block(block, 0);
nlmsvc_insert_block_locked(block, 0);
svc_wake_up(block->b_daemon);
rc = 0;
break;
}
}
unlock_kernel();
spin_unlock(&nlm_blocked_lock);
if (rc == -ENOENT)
printk(KERN_WARNING "lockd: grant for unknown block\n");
return rc;
@ -803,7 +813,7 @@ static void nlmsvc_grant_callback(struct rpc_task *task, void *data)
dprintk("lockd: GRANT_MSG RPC callback\n");
lock_kernel();
spin_lock(&nlm_blocked_lock);
/* if the block is not on a list at this point then it has
* been invalidated. Don't try to requeue it.
*
@ -825,19 +835,20 @@ static void nlmsvc_grant_callback(struct rpc_task *task, void *data)
/* Call was successful, now wait for client callback */
timeout = 60 * HZ;
}
nlmsvc_insert_block(block, timeout);
nlmsvc_insert_block_locked(block, timeout);
svc_wake_up(block->b_daemon);
out:
unlock_kernel();
spin_unlock(&nlm_blocked_lock);
}
/*
* FIXME: nlmsvc_release_block() grabs a mutex. This is not allowed for an
* .rpc_release rpc_call_op
*/
static void nlmsvc_grant_release(void *data)
{
struct nlm_rqst *call = data;
lock_kernel();
nlmsvc_release_block(call->a_block);
unlock_kernel();
}
static const struct rpc_call_ops nlmsvc_grant_ops = {

2
fs/lockd/svcproc.c
View File

@ -260,9 +260,7 @@ static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
static void nlmsvc_callback_release(void *data)
{
lock_kernel();
nlm_release_call(data);
unlock_kernel();
}
static const struct rpc_call_ops nlmsvc_callback_ops = {