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Subject[PATCH 4.9 037/138] NFS: Avoid RCU usage in tracepoints
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anna Schumaker <Anna.Schumaker@Netapp.com>

commit 3944369db701f075092357b511fd9f5755771585 upstream.

There isn't an obvious way to acquire and release the RCU lock during a
tracepoint, so we can't use the rpc_peeraddr2str() function here.
Instead, rely on the client's cl_hostname, which should have similar
enough information without needing an rcu_dereference().

Reported-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/nfs/nfs4trace.h | 24 ++++++------------------
1 file changed, 6 insertions(+), 18 deletions(-)

--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -201,17 +201,13 @@ DECLARE_EVENT_CLASS(nfs4_clientid_event,
TP_ARGS(clp, error),

TP_STRUCT__entry(
- __string(dstaddr,
- rpc_peeraddr2str(clp->cl_rpcclient,
- RPC_DISPLAY_ADDR))
+ __string(dstaddr, clp->cl_hostname)
__field(int, error)
),

TP_fast_assign(
__entry->error = error;
- __assign_str(dstaddr,
- rpc_peeraddr2str(clp->cl_rpcclient,
- RPC_DISPLAY_ADDR));
+ __assign_str(dstaddr, clp->cl_hostname);
),

TP_printk(
@@ -1103,9 +1099,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_callback_
__field(dev_t, dev)
__field(u32, fhandle)
__field(u64, fileid)
- __string(dstaddr, clp ?
- rpc_peeraddr2str(clp->cl_rpcclient,
- RPC_DISPLAY_ADDR) : "unknown")
+ __string(dstaddr, clp ? clp->cl_hostname : "unknown")
),

TP_fast_assign(
@@ -1118,9 +1112,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_callback_
__entry->fileid = 0;
__entry->dev = 0;
}
- __assign_str(dstaddr, clp ?
- rpc_peeraddr2str(clp->cl_rpcclient,
- RPC_DISPLAY_ADDR) : "unknown")
+ __assign_str(dstaddr, clp ? clp->cl_hostname : "unknown")
),

TP_printk(
@@ -1162,9 +1154,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_stateid_c
__field(dev_t, dev)
__field(u32, fhandle)
__field(u64, fileid)
- __string(dstaddr, clp ?
- rpc_peeraddr2str(clp->cl_rpcclient,
- RPC_DISPLAY_ADDR) : "unknown")
+ __string(dstaddr, clp ? clp->cl_hostname : "unknown")
__field(int, stateid_seq)
__field(u32, stateid_hash)
),
@@ -1179,9 +1169,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_stateid_c
__entry->fileid = 0;
__entry->dev = 0;
}
- __assign_str(dstaddr, clp ?
- rpc_peeraddr2str(clp->cl_rpcclient,
- RPC_DISPLAY_ADDR) : "unknown")
+ __assign_str(dstaddr, clp ? clp->cl_hostname : "unknown")
__entry->stateid_seq =
be32_to_cpu(stateid->seqid);
__entry->stateid_hash =

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