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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2017-08-13 10:03:59 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2017-08-16 15:10:15 -0400 |
| commit | 729749bb8da186e68d97d1b0439f0b1e0059c41d (patch) | |
| tree | c1d450aa081919168535f06755247f022a09a517 /net/sunrpc/xprtsock.c | |
| parent | 2ce209c42c01ca976ad680fea52a8e8b9a53643b (diff) | |
| download | linux-stable-729749bb8da186e68d97d1b0439f0b1e0059c41d.tar.gz linux-stable-729749bb8da186e68d97d1b0439f0b1e0059c41d.tar.bz2 linux-stable-729749bb8da186e68d97d1b0439f0b1e0059c41d.zip | |
SUNRPC: Don't hold the transport lock across socket copy operations
Instead add a mechanism to ensure that the request doesn't disappear
from underneath us while copying from the socket. We do this by
preventing xprt_release() from freeing the XDR buffers until the
flag RPC_TASK_MSG_RECV has been cleared from the request.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'net/sunrpc/xprtsock.c')
| -rw-r--r-- | net/sunrpc/xprtsock.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 4f154d388748..04dbc7027712 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -973,6 +973,8 @@ static void xs_local_data_read_skb(struct rpc_xprt *xprt, rovr = xprt_lookup_rqst(xprt, *xp); if (!rovr) goto out_unlock; + xprt_pin_rqst(rovr); + spin_unlock_bh(&xprt->transport_lock); task = rovr->rq_task; copied = rovr->rq_private_buf.buflen; @@ -981,11 +983,14 @@ static void xs_local_data_read_skb(struct rpc_xprt *xprt, if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { dprintk("RPC: sk_buff copy failed\n"); - goto out_unlock; + spin_lock_bh(&xprt->transport_lock); + goto out_unpin; } + spin_lock_bh(&xprt->transport_lock); xprt_complete_rqst(task, copied); - +out_unpin: + xprt_unpin_rqst(rovr); out_unlock: spin_unlock_bh(&xprt->transport_lock); } @@ -1054,6 +1059,8 @@ static void xs_udp_data_read_skb(struct rpc_xprt *xprt, rovr = xprt_lookup_rqst(xprt, *xp); if (!rovr) goto out_unlock; + xprt_pin_rqst(rovr); + spin_unlock_bh(&xprt->transport_lock); task = rovr->rq_task; if ((copied = rovr->rq_private_buf.buflen) > repsize) @@ -1062,14 +1069,17 @@ static void xs_udp_data_read_skb(struct rpc_xprt *xprt, /* Suck it into the iovec, verify checksum if not done by hw. */ if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); - goto out_unlock; + spin_lock_bh(&xprt->transport_lock); + goto out_unpin; } __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); + spin_lock_bh(&xprt->transport_lock); xprt_adjust_cwnd(xprt, task, copied); xprt_complete_rqst(task, copied); - +out_unpin: + xprt_unpin_rqst(rovr); out_unlock: spin_unlock_bh(&xprt->transport_lock); } @@ -1351,12 +1361,15 @@ static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, spin_unlock_bh(&xprt->transport_lock); return -1; } + xprt_pin_rqst(req); + spin_unlock_bh(&xprt->transport_lock); xs_tcp_read_common(xprt, desc, req); + spin_lock_bh(&xprt->transport_lock); if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) xprt_complete_rqst(req->rq_task, transport->tcp_copied); - + xprt_unpin_rqst(req); spin_unlock_bh(&xprt->transport_lock); return 0; } |