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nfsd: fix a warning in __cld_pipe_upcall()

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__cld_pipe_upcall() emits a "do not call blocking ops when
!TASK_RUNNING" warning due to the dput() call in rpc_queue_upcall().
Fix it by using a completion instead of hand coding the wait.

Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Scott Mayhew 2018-11-06 13:35:08 -05:00 committed by J. Bruce Fields
parent 62a063b8e7
commit b493fd31c0
1 changed files with 6 additions and 11 deletions
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17
fs/nfsd/nfs4recover.c
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@ -662,7 +662,7 @@ struct cld_net {
struct cld_upcall {
struct list_head cu_list;
struct cld_net *cu_net;
struct task_struct *cu_task;
struct completion cu_done;
struct cld_msg cu_msg;
};
@ -671,23 +671,18 @@ __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
{
int ret;
struct rpc_pipe_msg msg;
struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, cu_msg);
memset(&msg, 0, sizeof(msg));
msg.data = cmsg;
msg.len = sizeof(*cmsg);
/*
* Set task state before we queue the upcall. That prevents
* wake_up_process in the downcall from racing with schedule.
*/
set_current_state(TASK_UNINTERRUPTIBLE);
ret = rpc_queue_upcall(pipe, &msg);
if (ret < 0) {
set_current_state(TASK_RUNNING);
goto out;
}
schedule();
wait_for_completion(&cup->cu_done);
if (msg.errno < 0)
ret = msg.errno;
@ -754,7 +749,7 @@ cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
return -EFAULT;
wake_up_process(cup->cu_task);
complete(&cup->cu_done);
return mlen;
}
@ -769,7 +764,7 @@ cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
if (msg->errno >= 0)
return;
wake_up_process(cup->cu_task);
complete(&cup->cu_done);
}
static const struct rpc_pipe_ops cld_upcall_ops = {
@ -900,7 +895,7 @@ alloc_cld_upcall(struct cld_net *cn)
goto restart_search;
}
}
new->cu_task = current;
init_completion(&new->cu_done);
new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
new->cu_net = cn;