SUNRPC: Make RPC portmapper use per-transport storage
Move connection and bind state that was maintained in the rpc_clnt structure to the rpc_xprt structure. This will allow the creation of a clean API for plugging in different types of bind mechanisms. This brings improvements such as the elimination of a single spin lock to control serialization for all in-kernel RPC binding. A set of per-xprt bitops is used to serialize tasks during RPC binding, just like it now works for making RPC transport connections. Test-plan: Destructive testing (unplugging the network temporarily). Connectathon with UDP and TCP. NFSv2/3 and NFSv4 mounting should be carefully checked. Probably need to rig a server where certain services aren't running, or that returns an error for some typical operation. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever
Trond Myklebust
Родитель
ec739ef03d
Коммит
4a68179d38
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@ -18,18 +18,6 @@
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#include <linux/sunrpc/timer.h>
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#include <asm/signal.h>
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/*
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* This defines an RPC port mapping
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*/
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struct rpc_portmap {
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__u32 pm_prog;
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__u32 pm_vers;
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__u32 pm_prot;
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__u16 pm_port;
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unsigned char pm_binding : 1; /* doing a getport() */
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struct rpc_wait_queue pm_bindwait; /* waiting on getport() */
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};
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struct rpc_inode;
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/*
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@ -40,7 +28,9 @@ struct rpc_clnt {
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atomic_t cl_users; /* number of references */
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struct rpc_xprt * cl_xprt; /* transport */
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struct rpc_procinfo * cl_procinfo; /* procedure info */
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u32 cl_maxproc; /* max procedure number */
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u32 cl_prog, /* RPC program number */
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cl_vers, /* RPC version number */
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cl_maxproc; /* max procedure number */
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char * cl_server; /* server machine name */
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char * cl_protname; /* protocol name */
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@ -55,7 +45,6 @@ struct rpc_clnt {
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cl_dead : 1;/* abandoned */
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struct rpc_rtt * cl_rtt; /* RTO estimator data */
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struct rpc_portmap * cl_pmap; /* port mapping */
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int cl_nodelen; /* nodename length */
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char cl_nodename[UNX_MAXNODENAME];
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@ -64,14 +53,8 @@ struct rpc_clnt {
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struct dentry * cl_dentry; /* inode */
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struct rpc_clnt * cl_parent; /* Points to parent of clones */
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struct rpc_rtt cl_rtt_default;
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struct rpc_portmap cl_pmap_default;
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char cl_inline_name[32];
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};
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#define cl_timeout cl_xprt->timeout
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#define cl_prog cl_pmap->pm_prog
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#define cl_vers cl_pmap->pm_vers
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#define cl_port cl_pmap->pm_port
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#define cl_prot cl_pmap->pm_prot
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/*
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* General RPC program info
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@ -138,6 +138,7 @@ struct rpc_xprt {
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unsigned int tsh_size; /* size of transport specific
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header */
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struct rpc_wait_queue binding; /* requests waiting on rpcbind */
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struct rpc_wait_queue sending; /* requests waiting to send */
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struct rpc_wait_queue resend; /* requests waiting to resend */
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struct rpc_wait_queue pending; /* requests in flight */
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@ -270,6 +271,7 @@ int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to);
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#define XPRT_CONNECTING (2)
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#define XPRT_CLOSE_WAIT (3)
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#define XPRT_BOUND (4)
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#define XPRT_BINDING (5)
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static inline void xprt_set_connected(struct rpc_xprt *xprt)
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{
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@ -328,6 +330,18 @@ static inline void xprt_clear_bound(struct rpc_xprt *xprt)
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clear_bit(XPRT_BOUND, &xprt->state);
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}
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static inline void xprt_clear_binding(struct rpc_xprt *xprt)
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{
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smp_mb__before_clear_bit();
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clear_bit(XPRT_BINDING, &xprt->state);
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smp_mb__after_clear_bit();
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}
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static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
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{
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return test_and_set_bit(XPRT_BINDING, &xprt->state);
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}
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#endif /* __KERNEL__*/
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#endif /* _LINUX_SUNRPC_XPRT_H */
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@ -147,13 +147,10 @@ rpc_new_client(struct rpc_xprt *xprt, char *servname,
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clnt->cl_procinfo = version->procs;
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clnt->cl_maxproc = version->nrprocs;
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clnt->cl_protname = program->name;
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clnt->cl_pmap = &clnt->cl_pmap_default;
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clnt->cl_prog = program->number;
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clnt->cl_vers = version->number;
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clnt->cl_prot = xprt->prot;
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clnt->cl_stats = program->stats;
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clnt->cl_metrics = rpc_alloc_iostats(clnt);
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rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
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if (!xprt_bound(clnt->cl_xprt))
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clnt->cl_autobind = 1;
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@ -243,8 +240,6 @@ rpc_clone_client(struct rpc_clnt *clnt)
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atomic_set(&new->cl_users, 0);
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new->cl_parent = clnt;
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atomic_inc(&clnt->cl_count);
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/* Duplicate portmapper */
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rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
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/* Turn off autobind on clones */
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new->cl_autobind = 0;
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new->cl_oneshot = 0;
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@ -254,8 +249,7 @@ rpc_clone_client(struct rpc_clnt *clnt)
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rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
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if (new->cl_auth)
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atomic_inc(&new->cl_auth->au_count);
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new->cl_pmap = &new->cl_pmap_default;
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new->cl_metrics = rpc_alloc_iostats(clnt);
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new->cl_metrics = rpc_alloc_iostats(clnt);
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return new;
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out_no_clnt:
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printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
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@ -24,11 +24,57 @@
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#define PMAP_UNSET 2
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#define PMAP_GETPORT 3
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struct portmap_args {
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u32 pm_prog;
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u32 pm_vers;
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u32 pm_prot;
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unsigned short pm_port;
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struct rpc_task * pm_task;
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};
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static struct rpc_procinfo pmap_procedures[];
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static struct rpc_clnt * pmap_create(char *, struct sockaddr_in *, int, int);
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static void pmap_getport_done(struct rpc_task *);
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static void pmap_getport_done(struct rpc_task *, void *);
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static struct rpc_program pmap_program;
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static DEFINE_SPINLOCK(pmap_lock);
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static void pmap_getport_prepare(struct rpc_task *task, void *calldata)
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{
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struct portmap_args *map = calldata;
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struct rpc_message msg = {
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.rpc_proc = &pmap_procedures[PMAP_GETPORT],
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.rpc_argp = map,
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.rpc_resp = &map->pm_port,
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};
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rpc_call_setup(task, &msg, 0);
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}
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static inline struct portmap_args *pmap_map_alloc(void)
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{
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return kmalloc(sizeof(struct portmap_args), GFP_NOFS);
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}
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static inline void pmap_map_free(struct portmap_args *map)
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{
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kfree(map);
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}
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static void pmap_map_release(void *data)
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{
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pmap_map_free(data);
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}
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static const struct rpc_call_ops pmap_getport_ops = {
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.rpc_call_prepare = pmap_getport_prepare,
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.rpc_call_done = pmap_getport_done,
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.rpc_release = pmap_map_release,
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};
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static inline void pmap_wake_portmap_waiters(struct rpc_xprt *xprt)
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{
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xprt_clear_binding(xprt);
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rpc_wake_up(&xprt->binding);
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}
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/*
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* Obtain the port for a given RPC service on a given host. This one can
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@ -37,67 +83,71 @@ static DEFINE_SPINLOCK(pmap_lock);
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void
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rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
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{
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struct rpc_portmap *map = clnt->cl_pmap;
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struct sockaddr_in *sap = &clnt->cl_xprt->addr;
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struct rpc_message msg = {
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.rpc_proc = &pmap_procedures[PMAP_GETPORT],
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.rpc_argp = map,
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.rpc_resp = &clnt->cl_port,
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.rpc_cred = NULL
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};
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struct rpc_xprt *xprt = task->tk_xprt;
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struct sockaddr_in *sap = &xprt->addr;
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struct portmap_args *map;
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struct rpc_clnt *pmap_clnt;
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struct rpc_task *child;
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struct rpc_task *child;
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dprintk("RPC: %4d rpc_getport(%s, %d, %d, %d)\n",
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dprintk("RPC: %4d rpc_getport(%s, %u, %u, %d)\n",
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task->tk_pid, clnt->cl_server,
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map->pm_prog, map->pm_vers, map->pm_prot);
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clnt->cl_prog, clnt->cl_vers, xprt->prot);
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/* Autobind on cloned rpc clients is discouraged */
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BUG_ON(clnt->cl_parent != clnt);
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spin_lock(&pmap_lock);
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if (map->pm_binding) {
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rpc_sleep_on(&map->pm_bindwait, task, NULL, NULL);
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spin_unlock(&pmap_lock);
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if (xprt_test_and_set_binding(xprt)) {
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task->tk_status = -EACCES; /* tell caller to check again */
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rpc_sleep_on(&xprt->binding, task, NULL, NULL);
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return;
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}
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map->pm_binding = 1;
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spin_unlock(&pmap_lock);
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/* Someone else may have bound if we slept */
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if (xprt_bound(xprt)) {
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task->tk_status = 0;
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goto bailout_nofree;
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}
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map = pmap_map_alloc();
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if (!map) {
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task->tk_status = -ENOMEM;
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goto bailout_nofree;
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}
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map->pm_prog = clnt->cl_prog;
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map->pm_vers = clnt->cl_vers;
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map->pm_prot = xprt->prot;
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map->pm_port = 0;
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map->pm_task = task;
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pmap_clnt = pmap_create(clnt->cl_server, sap, map->pm_prot, 0);
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if (IS_ERR(pmap_clnt)) {
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task->tk_status = PTR_ERR(pmap_clnt);
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goto bailout;
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}
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task->tk_status = 0;
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/*
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* Note: rpc_new_child will release client after a failure.
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*/
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if (!(child = rpc_new_child(pmap_clnt, task)))
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child = rpc_run_task(pmap_clnt, RPC_TASK_ASYNC, &pmap_getport_ops, map);
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if (IS_ERR(child)) {
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task->tk_status = -EIO;
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goto bailout;
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}
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rpc_release_task(child);
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/* Setup the call info struct */
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rpc_call_setup(child, &msg, 0);
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rpc_sleep_on(&xprt->binding, task, NULL, NULL);
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/* ... and run the child task */
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task->tk_xprt->stat.bind_count++;
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rpc_run_child(task, child, pmap_getport_done);
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return;
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bailout:
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spin_lock(&pmap_lock);
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map->pm_binding = 0;
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rpc_wake_up(&map->pm_bindwait);
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spin_unlock(&pmap_lock);
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rpc_exit(task, -EIO);
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pmap_map_free(map);
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bailout_nofree:
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pmap_wake_portmap_waiters(xprt);
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}
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#ifdef CONFIG_ROOT_NFS
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int
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rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
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{
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struct rpc_portmap map = {
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struct portmap_args map = {
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.pm_prog = prog,
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.pm_vers = vers,
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.pm_prot = prot,
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@ -133,32 +183,32 @@ rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
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#endif
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static void
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pmap_getport_done(struct rpc_task *task)
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pmap_getport_done(struct rpc_task *child, void *data)
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{
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struct rpc_clnt *clnt = task->tk_client;
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struct portmap_args *map = data;
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struct rpc_task *task = map->pm_task;
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struct rpc_xprt *xprt = task->tk_xprt;
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struct rpc_portmap *map = clnt->cl_pmap;
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int status = child->tk_status;
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dprintk("RPC: %4d pmap_getport_done(status %d, port %d)\n",
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task->tk_pid, task->tk_status, clnt->cl_port);
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if (task->tk_status < 0) {
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/* Make the calling task exit with an error */
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if (status < 0) {
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/* Portmapper not available */
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xprt->ops->set_port(xprt, 0);
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task->tk_action = rpc_exit_task;
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} else if (clnt->cl_port == 0) {
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/* Program not registered */
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task->tk_status = status;
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} else if (map->pm_port == 0) {
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/* Requested RPC service wasn't registered */
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xprt->ops->set_port(xprt, 0);
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rpc_exit(task, -EACCES);
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task->tk_status = -EACCES;
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} else {
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xprt->ops->set_port(xprt, clnt->cl_port);
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/* Succeeded */
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xprt->ops->set_port(xprt, map->pm_port);
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xprt_set_bound(xprt);
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clnt->cl_port = htons(clnt->cl_port);
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task->tk_status = 0;
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}
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spin_lock(&pmap_lock);
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map->pm_binding = 0;
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rpc_wake_up(&map->pm_bindwait);
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spin_unlock(&pmap_lock);
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dprintk("RPC: %4d pmap_getport_done(status %d, port %u)\n",
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child->tk_pid, child->tk_status, map->pm_port);
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pmap_wake_portmap_waiters(xprt);
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}
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/*
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@ -172,7 +222,7 @@ rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
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.sin_family = AF_INET,
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.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
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};
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struct rpc_portmap map = {
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struct portmap_args map = {
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.pm_prog = prog,
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.pm_vers = vers,
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.pm_prot = prot,
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@ -239,7 +289,7 @@ pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto, int privileg
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* XDR encode/decode functions for PMAP
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*/
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static int
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xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map)
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xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct portmap_args *map)
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{
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dprintk("RPC: xdr_encode_mapping(%d, %d, %d, %d)\n",
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map->pm_prog, map->pm_vers, map->pm_prot, map->pm_port);
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@ -928,6 +928,7 @@ static struct rpc_xprt *xprt_setup(int proto, struct sockaddr_in *ap, struct rpc
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xprt->last_used = jiffies;
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xprt->cwnd = RPC_INITCWND;
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rpc_init_wait_queue(&xprt->binding, "xprt_binding");
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rpc_init_wait_queue(&xprt->pending, "xprt_pending");
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rpc_init_wait_queue(&xprt->sending, "xprt_sending");
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rpc_init_wait_queue(&xprt->resend, "xprt_resend");
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