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Merge tag 'nfs-for-4.15-3' of git://git.linux-nfs.org/projects/anna/linux-nfs

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Pull NFS client fixes from Anna Schumaker:
 "This has two stable bugfixes, one to fix a BUG_ON() when
  nfs_commit_inode() is called with no outstanding commit requests and
  another to fix a race in the SUNRPC receive codepath.

  Additionally, there are also fixes for an NFS client deadlock and an
  xprtrdma performance regression.

  Summary:

  Stable bugfixes:
   - NFS: Avoid a BUG_ON() in nfs_commit_inode() by not waiting for a
     commit in the case that there were no commit requests.
   - SUNRPC: Fix a race in the receive code path

  Other fixes:
   - NFS: Fix a deadlock in nfs client initialization
   - xprtrdma: Fix a performance regression for small IOs"

* tag 'nfs-for-4.15-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  SUNRPC: Fix a race in the receive code path
  nfs: don't wait on commit in nfs_commit_inode() if there were no commit requests
  xprtrdma: Spread reply processing over more CPUs
  nfs: fix a deadlock in nfs client initialization
This commit is contained in:
Linus Torvalds
2017-12-16 13:12:53 -08:00
parent f6f3732162 90d91b0cd3
commit d025fbf1a2
8 changed files with 54 additions and 23 deletions
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36
net/sunrpc/xprt.c
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@@ -1001,6 +1001,7 @@ void xprt_transmit(struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_xprt *xprt = req->rq_xprt;
unsigned int connect_cookie;
int status, numreqs;
dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen);
@@ -1024,6 +1025,7 @@ void xprt_transmit(struct rpc_task *task)
} else if (!req->rq_bytes_sent)
return;
connect_cookie = xprt->connect_cookie;
req->rq_xtime = ktime_get();
status = xprt->ops->send_request(task);
trace_xprt_transmit(xprt, req->rq_xid, status);
@@ -1047,20 +1049,28 @@ void xprt_transmit(struct rpc_task *task)
xprt->stat.bklog_u += xprt->backlog.qlen;
xprt->stat.sending_u += xprt->sending.qlen;
xprt->stat.pending_u += xprt->pending.qlen;
/* Don't race with disconnect */
if (!xprt_connected(xprt))
task->tk_status = -ENOTCONN;
else {
/*
* Sleep on the pending queue since
* we're expecting a reply.
*/
if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task))
rpc_sleep_on(&xprt->pending, task, xprt_timer);
req->rq_connect_cookie = xprt->connect_cookie;
}
spin_unlock_bh(&xprt->transport_lock);
req->rq_connect_cookie = connect_cookie;
if (rpc_reply_expected(task) && !READ_ONCE(req->rq_reply_bytes_recvd)) {
/*
* Sleep on the pending queue if we're expecting a reply.
* The spinlock ensures atomicity between the test of
* req->rq_reply_bytes_recvd, and the call to rpc_sleep_on().
*/
spin_lock(&xprt->recv_lock);
if (!req->rq_reply_bytes_recvd) {
rpc_sleep_on(&xprt->pending, task, xprt_timer);
/*
* Send an extra queue wakeup call if the
* connection was dropped in case the call to
* rpc_sleep_on() raced.
*/
if (!xprt_connected(xprt))
xprt_wake_pending_tasks(xprt, -ENOTCONN);
}
spin_unlock(&xprt->recv_lock);
}
}
static void xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task)