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| author |   Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-03-01 17:00:56 -0500 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-03-02 15:36:38 -0500 |
| commit | 2446ab6070861aba2dd9229463ffbc40016a9f33 (patch) | |
| tree | 2e366c3236788936b9f4f58c0787ae01c265f4a4 /include/linux/sunrpc/debug.h | |
| parent | NFS: Add debugging messages to NFSv4's CLOSE procedure (diff) | |
| download | linux-dev-2446ab6070861aba2dd9229463ffbc40016a9f33.tar.xz linux-dev-2446ab6070861aba2dd9229463ffbc40016a9f33.zip | |
SUNRPC: Use RCU to dereference the rpc_clnt.cl_xprt field
A migration event will replace the rpc_xprt used by an rpc_clnt. To
ensure this can be done safely, all references to cl_xprt must now use
a form of rcu_dereference().
Special care is taken with rpc_peeraddr2str(), which returns a pointer
to memory whose lifetime is the same as the rpc_xprt.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
[ cel: fix lockdep splats and layering violations ]
[ cel: forward ported to 3.4 ]
[ cel: remove rpc_max_reqs(), add rpc_net_ns() ]
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'include/linux/sunrpc/debug.h')
| -rw-r--r-- | include/linux/sunrpc/debug.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h index b506936f4ce6..6cb2517bcf75 100644 --- a/include/linux/sunrpc/debug.h +++ b/include/linux/sunrpc/debug.h @@ -50,19 +50,32 @@ extern unsigned int nlm_debug; #endif #define dprintk(args...) dfprintk(FACILITY, ## args) +#define dprintk_rcu(args...) dfprintk_rcu(FACILITY, ## args) #undef ifdebug #ifdef RPC_DEBUG # define ifdebug(fac) if (unlikely(rpc_debug & RPCDBG_##fac)) + # define dfprintk(fac, args...) \ do { \ ifdebug(fac) \ printk(KERN_DEFAULT args); \ } while (0) + +# define dfprintk_rcu(fac, args...) \ + do { \ + ifdebug(fac) { \ + rcu_read_lock(); \ + printk(KERN_DEFAULT args); \ + rcu_read_unlock(); \ + } \ + } while (0) + # define RPC_IFDEBUG(x) x #else # define ifdebug(fac) if (0) # define dfprintk(fac, args...) do ; while (0) +# define dfprintk_rcu(fac, args...) do ; while (0) # define RPC_IFDEBUG(x) #endif |