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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#ifndef SUNRPC_SVC_H#define SUNRPC_SVC_H
#include <linux/in.h>#include <linux/in6.h>#include <linux/sunrpc/types.h>#include <linux/sunrpc/xdr.h>#include <linux/sunrpc/auth.h>#include <linux/sunrpc/svcauth.h>#include <linux/lwq.h>#include <linux/wait.h>#include <linux/mm.h>#include <linux/folio_batch.h>#include <linux/kthread.h>
/* * * RPC service thread pool. * * Pool of threads and temporary sockets. Generally there is only * a single one of these per RPC service, but on NUMA machines those * services that can benefit from it (i.e. nfs but not lockd) will * have one pool per NUMA node. This optimisation reduces cross- * node traffic on multi-node NUMA NFS servers. */struct svc_pool { unsigned int sp_id; /* pool id; also node id on NUMA */ unsigned int sp_nrthreads; /* # of threads currently running in pool */ unsigned int sp_nrthrmin; /* Min number of threads to run per pool */ unsigned int sp_nrthrmax; /* Max requested number of threads in pool */ struct lwq sp_xprts; /* pending transports */ struct list_head sp_all_threads; /* all server threads */ struct llist_head sp_idle_threads; /* idle server threads */
/* statistics on pool operation */ struct percpu_counter sp_messages_arrived; struct percpu_counter sp_sockets_queued; struct percpu_counter sp_threads_woken;
unsigned long sp_flags;} ____cacheline_aligned_in_smp;
/* bits for sp_flags */enum { SP_TASK_PENDING, /* still work to do even if no xprt is queued */ SP_NEED_VICTIM, /* One thread needs to agree to exit */ SP_VICTIM_REMAINS, /* One thread needs to actually exit */ SP_TASK_STARTING, /* Task has started but not added to idle yet */};
/* * RPC service. * * An RPC service is a ``daemon,'' possibly multithreaded, which * receives and processes incoming RPC messages. * It has one or more transport sockets associated with it, and maintains * a list of idle threads waiting for input. * * We currently do not support more than one RPC program per daemon. */struct svc_serv { struct svc_program * sv_programs; /* RPC programs */ struct svc_stat * sv_stats; /* RPC statistics */ spinlock_t sv_lock; unsigned int sv_nprogs; /* Number of sv_programs */ unsigned int sv_nrthreads; /* # of running server threads */ unsigned int sv_max_payload; /* datagram payload size */ unsigned int sv_max_mesg; /* max_payload + 1 page for overheads */ unsigned int sv_xdrsize; /* XDR buffer size */ atomic_t sv_rpcb_failures; /* unanswered rpcbind calls */ struct list_head sv_permsocks; /* all permanent sockets */ struct list_head sv_tempsocks; /* all temporary sockets */ int sv_tmpcnt; /* count of temporary "valid" sockets */ struct timer_list sv_temptimer; /* timer for aging temporary sockets */
char * sv_name; /* service name */
bool sv_is_pooled; /* is this a pooled service? */ /* Caller registers with rpcbind itself. Set before svc_bind(). */ bool sv_no_rpcbind; struct svc_pool * sv_pools; /* array of thread pools */ int (*sv_threadfn)(void *data);
#if defined(CONFIG_SUNRPC_BACKCHANNEL) struct lwq sv_cb_list; /* queue for callback requests * that arrive over the same * connection */ bool sv_bc_enabled; /* service uses backchannel */#endif /* CONFIG_SUNRPC_BACKCHANNEL */};
/* This is used by pool_stats to find and lock an svc */struct svc_info { struct svc_serv *serv; struct mutex *mutex;};
void svc_destroy(struct svc_serv **svcp);
/* * Maximum payload size supported by a kernel RPC server. * This is use to determine the max number of pages nfsd is * willing to return in a single READ operation. * * These happen to all be powers of 2, which is not strictly * necessary but helps enforce the real limitation, which is * that they should be multiples of PAGE_SIZE. * * For UDP transports, a block plus NFS,RPC, and UDP headers * has to fit into the IP datagram limit of 64K. The largest * feasible number for all known page sizes is probably 48K, * but we choose 32K here. This is the same as the historical * Linux limit; someone who cares more about NFS/UDP performance * can test a larger number. * * For non-UDP transports we have more freedom. A size of 4MB is * chosen to accommodate clients that support larger I/O sizes. */enum { RPCSVC_MAXPAYLOAD = 4 * 1024 * 1024, RPCSVC_MAXPAYLOAD_TCP = RPCSVC_MAXPAYLOAD, RPCSVC_MAXPAYLOAD_UDP = 32 * 1024,};
extern u32 svc_max_payload(const struct svc_rqst *rqstp);
/* * RPC Call and Reply messages each have their own page array. * rq_pages holds the incoming Call message; rq_respages holds * the outgoing Reply message. Both arrays are sized to * svc_serv_maxpages() entries and are allocated dynamically. * * Pages are sent using ->sendmsg with MSG_SPLICE_PAGES so each * server thread needs to allocate more to replace those used in * sending. * * rq_pages request page contract: * * Transport receive paths that move request data pages out of * rq_pages -- TCP multi-fragment reassembly (svc_tcp_save_pages) * and RDMA Read I/O (svc_rdma_clear_rqst_pages) -- NULL those * entries to prevent svc_rqst_release_pages() from freeing pages * still in transport use, and set rq_pages_nfree to the count. * svc_alloc_arg() refills only that many rq_pages entries. * * For rq_respages, svc_rqst_release_pages() NULLs entries in * [rq_respages, rq_next_page) after each RPC. svc_alloc_arg() * refills only that range. * * xdr_buf holds responses; the structure fits NFS read responses * (header, data pages, optional tail) and enables sharing of * client-side routines. * * The xdr_buf.head kvec always points to the first page in the * rq_*pages list. The xdr_buf.pages pointer points to the second * page on that list. xdr_buf.tail points to the end of the first * page. This assumes that the non-page part of an rpc reply will * fit in a page - NFSd ensures this. lockd also has no trouble. */
/** * svc_serv_maxpages - maximum count of pages needed for one RPC message * @serv: RPC service context * * Returns a count of pages or vectors that can hold the maximum * size RPC message for @serv. * * Each page array can hold at most one payload plus two * overhead pages (one for the RPC header, one for tail data). * nfsd_splice_actor() might need an extra page when a READ * payload is not page-aligned. */static inline unsigned long svc_serv_maxpages(const struct svc_serv *serv){ return DIV_ROUND_UP(serv->sv_max_mesg, PAGE_SIZE) + 2 + 1;}
/* * The context of a single thread, including the request currently being * processed. * * RPC programs are free to use rq_private to stash thread-local information. * The sunrpc layer will not access it. */struct svc_rqst { struct list_head rq_all; /* all threads list */ struct llist_node rq_idle; /* On the idle list */ struct rcu_head rq_rcu_head; /* for RCU deferred kfree */ struct svc_xprt * rq_xprt; /* transport ptr */
struct sockaddr_storage rq_addr; /* peer address */ size_t rq_addrlen; struct sockaddr_storage rq_daddr; /* dest addr of request * - reply from here */ size_t rq_daddrlen;
struct svc_serv * rq_server; /* RPC service definition */ struct svc_pool * rq_pool; /* thread pool */ const struct svc_procedure *rq_procinfo;/* procedure info */ struct auth_ops * rq_authop; /* authentication flavour */ struct svc_cred rq_cred; /* auth info */ void * rq_xprt_ctxt; /* transport specific context ptr */ struct svc_deferred_req*rq_deferred; /* deferred request we are replaying */
struct xdr_buf rq_arg; struct xdr_stream rq_arg_stream; struct xdr_stream rq_res_stream; struct folio *rq_scratch_folio; struct xdr_buf rq_res; unsigned long rq_maxpages; /* entries per page array */ unsigned long rq_pages_nfree; /* rq_pages entries NULLed by transport */ struct page * *rq_pages; /* Call buffer pages */ struct page * *rq_respages; /* Reply buffer pages */ struct page * *rq_next_page; /* next reply page to use */ struct page * *rq_page_end; /* one past the last reply page */
struct folio_batch rq_fbatch; struct bio_vec *rq_bvec;
__be32 rq_xid; /* transmission id */ u32 rq_prog; /* program number */ u32 rq_vers; /* program version */ u32 rq_proc; /* procedure number */ u32 rq_prot; /* IP protocol */ unsigned long rq_flags; /* flags field */ ktime_t rq_qtime; /* enqueue time */
void * rq_argp; /* decoded arguments */ void * rq_resp; /* xdr'd results */ __be32 *rq_accept_statp; void * rq_auth_data; /* flavor-specific data */ __be32 rq_auth_stat; /* authentication status */ int rq_auth_slack; /* extra space xdr code * should leave in head * for krb5i, krb5p. */ int rq_reserved; /* space on socket outq * reserved for this request */ ktime_t rq_stime; /* start time */
struct cache_req rq_chandle; /* handle passed to caches for * request delaying */ /* Catering to nfsd */ struct auth_domain * rq_client; /* RPC peer info */ struct auth_domain * rq_gssclient; /* "gss/"-style peer info */ struct task_struct *rq_task; /* service thread */ struct net *rq_bc_net; /* pointer to backchannel's * net namespace */
int rq_err; /* Thread sets this to inidicate * initialisation success. */
unsigned long bc_to_initval; unsigned int bc_to_retries; unsigned int rq_status_counter; /* RPC processing counter */ void *rq_private; /* For use by the service thread */};
/* bits for rq_flags */enum { RQ_SECURE, /* secure port */ RQ_LOCAL, /* local request */ RQ_USEDEFERRAL, /* use deferral */ RQ_DROPME, /* drop current reply */ RQ_VICTIM, /* Have agreed to shut down */ RQ_DATA, /* request has data */};
#define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
/* * Rigorous type checking on sockaddr type conversions */static inline struct sockaddr_in *svc_addr_in(const struct svc_rqst *rqst){ return (struct sockaddr_in *) &rqst->rq_addr;}
static inline struct sockaddr_in6 *svc_addr_in6(const struct svc_rqst *rqst){ return (struct sockaddr_in6 *) &rqst->rq_addr;}
static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst){ return (struct sockaddr *) &rqst->rq_addr;}
static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst){ return (struct sockaddr_in *) &rqst->rq_daddr;}
static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst){ return (struct sockaddr_in6 *) &rqst->rq_daddr;}
static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst){ return (struct sockaddr *) &rqst->rq_daddr;}
/** * svc_thread_should_stop - check if this thread should stop * @rqstp: the thread that might need to stop * * To stop an svc thread, the pool flags SP_NEED_VICTIM and SP_VICTIM_REMAINS * are set. The first thread which sees SP_NEED_VICTIM clears it, becoming * the victim using this function. It should then promptly call * svc_exit_thread() to complete the process, clearing SP_VICTIM_REMAINS * so the task waiting for a thread to exit can wake and continue. * * Return values: * %true: caller should invoke svc_exit_thread() * %false: caller should do nothing */static inline bool svc_thread_should_stop(struct svc_rqst *rqstp){ if (test_and_clear_bit(SP_NEED_VICTIM, &rqstp->rq_pool->sp_flags)) set_bit(RQ_VICTIM, &rqstp->rq_flags);
return test_bit(RQ_VICTIM, &rqstp->rq_flags);}
/** * svc_thread_init_status - report whether thread has initialised successfully * @rqstp: the thread in question * @err: errno code * * After performing any initialisation that could fail, and before starting * normal work, each sunrpc svc_thread must call svc_thread_init_status() * with an appropriate error, or zero. * * If zero is passed, the thread is ready and must continue until * svc_thread_should_stop() returns true. If a non-zero error is passed * the call will not return - the thread will exit. */static inline void svc_thread_init_status(struct svc_rqst *rqstp, int err){ store_release_wake_up(&rqstp->rq_err, err); if (err) kthread_exit(1);}
struct svc_deferred_req { u32 prot; /* protocol (UDP or TCP) */ struct svc_xprt *xprt; struct sockaddr_storage addr; /* where reply must go */ size_t addrlen; struct sockaddr_storage daddr; /* where reply must come from */ size_t daddrlen; void *xprt_ctxt; struct cache_deferred_req handle; int argslen; __be32 args[];};
struct svc_process_info { union { int (*dispatch)(struct svc_rqst *rqstp); struct { unsigned int lovers; unsigned int hivers; } mismatch; };};
/* * RPC program - an array of these can use the same transport endpoint */struct svc_program { u32 pg_prog; /* program number */ unsigned int pg_lovers; /* lowest version */ unsigned int pg_hivers; /* highest version */ unsigned int pg_nvers; /* number of versions */ const struct svc_version **pg_vers; /* version array */ char * pg_name; /* service name */ char * pg_class; /* class name: services sharing authentication */ enum svc_auth_status (*pg_authenticate)(struct svc_rqst *rqstp); __be32 (*pg_init_request)(struct svc_rqst *, const struct svc_program *, struct svc_process_info *); int (*pg_rpcbind_set)(struct net *net, const struct svc_program *, u32 version, int family, unsigned short proto, unsigned short port);};
/* * RPC program version */struct svc_version { u32 vs_vers; /* version number */ u32 vs_nproc; /* number of procedures */ const struct svc_procedure *vs_proc; /* per-procedure info */ u32 vs_xdrsize; /* xdrsize needed for this version */
/* Don't register with rpcbind */ bool vs_hidden;
/* Don't care if the rpcbind registration fails */ bool vs_rpcb_optnl;
/* Need xprt with congestion control */ bool vs_need_cong_ctrl;
/* Dispatch function */ int (*vs_dispatch)(struct svc_rqst *rqstp);};
/* * RPC procedure info */struct svc_procedure { /* process the request: */ __be32 (*pc_func)(struct svc_rqst *); /* XDR decode args: */ bool (*pc_decode)(struct svc_rqst *rqstp, struct xdr_stream *xdr); /* XDR encode result: */ bool (*pc_encode)(struct svc_rqst *rqstp, struct xdr_stream *xdr); /* XDR free result: */ void (*pc_release)(struct svc_rqst *); unsigned int pc_argsize; /* argument struct size */ unsigned int pc_argzero; /* how much of argument to clear */ unsigned int pc_ressize; /* result struct size */ unsigned int pc_cachetype; /* cache info (NFS) */ unsigned int pc_xdrressize; /* maximum size of XDR reply */ const char * pc_name; /* for display */};
/* * Function prototypes. */int sunrpc_set_pool_mode(const char *val);int sunrpc_get_pool_mode(char *val, size_t size);void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net);int svc_bind(struct svc_serv *serv, struct net *net);unsigned int svc_rpcb_failure_count(struct svc_serv *serv);struct svc_serv *svc_create(struct svc_program *, unsigned int, int (*threadfn)(void *data));bool svc_rqst_replace_page(struct svc_rqst *rqstp, struct page *page);void svc_rqst_release_pages(struct svc_rqst *rqstp);int svc_new_thread(struct svc_serv *serv, struct svc_pool *pool);void svc_exit_thread(struct svc_rqst *);struct svc_serv * svc_create_pooled(struct svc_program *prog, unsigned int nprog, struct svc_stat *stats, unsigned int bufsize, int (*threadfn)(void *data));int svc_set_pool_threads(struct svc_serv *serv, struct svc_pool *pool, unsigned int min_threads, unsigned int max_threads);int svc_set_num_threads(struct svc_serv *serv, unsigned int min_threads, unsigned int nrservs);unsigned int svc_serv_maxthreads(const struct svc_serv *serv);int svc_pool_stats_open(struct svc_info *si, struct file *file);void svc_process(struct svc_rqst *rqstp);void svc_process_bc(struct rpc_rqst *req, struct svc_rqst *rqstp);int svc_register(struct svc_serv *serv, struct net *net, const int family, const unsigned short proto, const unsigned short port);
void svc_wake_up(struct svc_serv *);void svc_reserve(struct svc_rqst *rqstp, int space);void svc_pool_wake_idle_thread(struct svc_pool *pool);struct svc_pool *svc_pool_for_cpu(struct svc_serv *serv);unsigned int svc_serv_nrpools(const struct svc_serv *serv);char * svc_print_addr(struct svc_rqst *, char *, size_t);const char * svc_proc_name(const struct svc_rqst *rqstp);int svc_encode_result_payload(struct svc_rqst *rqstp, unsigned int offset, unsigned int length);char *svc_fill_symlink_pathname(struct svc_rqst *rqstp, struct kvec *first, void *p, size_t total);__be32 svc_generic_init_request(struct svc_rqst *rqstp, const struct svc_program *progp, struct svc_process_info *procinfo);int svc_generic_rpcbind_set(struct net *net, const struct svc_program *progp, u32 version, int family, unsigned short proto, unsigned short port);
#define RPC_MAX_ADDRBUFLEN (63U)
/** * svc_rqst_page_release - release a page associated with an RPC transaction * @rqstp: RPC transaction context * @page: page to release * * Released pages are batched and freed together, reducing * allocator pressure under heavy RPC workloads. */static inline void svc_rqst_page_release(struct svc_rqst *rqstp, struct page *page){ if (!folio_batch_add(&rqstp->rq_fbatch, page_folio(page))) __folio_batch_release(&rqstp->rq_fbatch);}
/* * When we want to reduce the size of the reserved space in the response * buffer, we need to take into account the size of any checksum data that * may be at the end of the packet. This is difficult to determine exactly * for all cases without actually generating the checksum, so we just use a * static value. */static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space){ svc_reserve(rqstp, space + rqstp->rq_auth_slack);}
/** * svcxdr_init_decode - Prepare an xdr_stream for Call decoding * @rqstp: controlling server RPC transaction context * * The stream records @rqstp, so a codec running on it reaches the * transaction with svcxdr_rqst(). */static inline void svcxdr_init_decode(struct svc_rqst *rqstp){ struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct xdr_buf *buf = &rqstp->rq_arg; struct kvec *argv = buf->head;
WARN_ON(buf->len != buf->head->iov_len + buf->page_len + buf->tail->iov_len); buf->len = buf->head->iov_len + buf->page_len + buf->tail->iov_len;
xdr_init_decode(xdr, buf, argv->iov_base, NULL); xdr_set_scratch_folio(xdr, rqstp->rq_scratch_folio); xdr->xdrgen_ctx = rqstp;}
/** * svcxdr_init_encode - Prepare an xdr_stream for svc Reply encoding * @rqstp: controlling server RPC transaction context * * The stream records @rqstp, so a codec running on it reaches the * transaction with svcxdr_rqst(). */static inline void svcxdr_init_encode(struct svc_rqst *rqstp){ struct xdr_stream *xdr = &rqstp->rq_res_stream; struct xdr_buf *buf = &rqstp->rq_res; struct kvec *resv = buf->head;
xdr_reset_scratch_buffer(xdr);
xdr->buf = buf; xdr->iov = resv; xdr->p = resv->iov_base + resv->iov_len; xdr->end = resv->iov_base + PAGE_SIZE; buf->len = resv->iov_len; xdr->page_ptr = buf->pages - 1; buf->buflen = PAGE_SIZE * (rqstp->rq_page_end - buf->pages); xdr->rqst = NULL; xdr->xdrgen_ctx = rqstp;}
/** * svcxdr_rqst - Retrieve the transaction bound to an xdr_stream * @xdr: stream to query * * Return: the controlling svc_rqst when @xdr was initialized by * svcxdr_init_decode() or svcxdr_init_encode(), otherwise NULL. */static inline struct svc_rqst *svcxdr_rqst(struct xdr_stream *xdr){ return xdr->xdrgen_ctx;}
/** * svcxdr_encode_opaque_pages - Insert pages into an xdr_stream * @xdr: xdr_stream to be updated * @pages: array of pages to insert * @base: starting offset of first data byte in @pages * @len: number of data bytes in @pages to insert * * After the @pages are added, the tail iovec is instantiated pointing * to end of the head buffer, and the stream is set up to encode * subsequent items into the tail. */static inline void svcxdr_encode_opaque_pages(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct page **pages, unsigned int base, unsigned int len){ xdr_write_pages(xdr, pages, base, len); xdr->page_ptr = rqstp->rq_next_page - 1;}
/** * svcxdr_encode_opaque_payload - Encode a page-resident opaque data item * @xdr: xdr_stream to be updated * @len: number of octets of content in the data item * * Context: Process context. @xdr must have been initialized by * svcxdr_init_encode() and still be positioned in the reply * head. * * Return: * %true: Success * %false: The reply head cannot hold the length prefix and XDR * padding, or the transport could not accommodate the result payload */static inline bool svcxdr_encode_opaque_payload(struct xdr_stream *xdr, u32 len){ struct svc_rqst *rqstp = svcxdr_rqst(xdr); struct xdr_buf *buf = xdr->buf;
/* * The length prefix and any pad word must land in the reply * head. A prefix that spills into the first Reply page lands * on the payload itself, and xdr_write_pages() BUGs when the * pad word does not fit. */ if ((xdr->end - xdr->p) * XDR_UNIT < XDR_UNIT + xdr_pad_size(len)) return false; if (xdr_stream_encode_u32(xdr, len) < 0) return false; svcxdr_encode_opaque_pages(rqstp, xdr, buf->pages, buf->page_base, len); if (svc_encode_result_payload(rqstp, buf->head->iov_len, len) < 0) return false; return true;}
/** * svcxdr_decode_opaque_payload - Decode a page-resident opaque data item * @xdr: xdr_stream to be decoded * @payload: on success, describes the octets of the data item's content * @maxlen: largest data item length the caller will accept, or zero for * no limit * * A bulk payload such as the content of an NFS WRITE request resides in * the pages of the Receive buffer. Rather than copy it, set @payload to * describe the item's content in place. * * Context: Process context. @xdr must have been initialized by * svcxdr_init_decode(). * * Return: * %true: @payload describes the item in place and @xdr has advanced * past it * %false: a bounds error occurred, or the length prefix exceeds * @maxlen; @payload is undefined */static inline bool svcxdr_decode_opaque_payload(struct xdr_stream *xdr, struct xdr_buf *payload, u32 maxlen){ u32 len;
if (xdr_stream_decode_u32(xdr, &len) < 0) return false; if (maxlen && len > maxlen) return false; return xdr_stream_subsegment(xdr, payload, len);}
/** * svcxdr_set_auth_slack - * @rqstp: RPC transaction * @slack: buffer space to reserve for the transaction's security flavor * * Set the request's slack space requirement, and set aside that much * space in the rqstp's rq_res.head for use when the auth wraps the Reply. */static inline void svcxdr_set_auth_slack(struct svc_rqst *rqstp, int slack){ struct xdr_stream *xdr = &rqstp->rq_res_stream; struct xdr_buf *buf = &rqstp->rq_res; struct kvec *resv = buf->head;
rqstp->rq_auth_slack = slack;
xdr->end -= XDR_QUADLEN(slack); buf->buflen -= rqstp->rq_auth_slack;
WARN_ON(xdr->iov != resv); WARN_ON(xdr->p > xdr->end);}
/** * svcxdr_set_accept_stat - Reserve space for the accept_stat field * @rqstp: RPC transaction context * * Return values: * %true: Success * %false: No response buffer space was available */static inline bool svcxdr_set_accept_stat(struct svc_rqst *rqstp){ struct xdr_stream *xdr = &rqstp->rq_res_stream;
rqstp->rq_accept_statp = xdr_reserve_space(xdr, XDR_UNIT); if (unlikely(!rqstp->rq_accept_statp)) return false; *rqstp->rq_accept_statp = rpc_success; return true;}
#endif /* SUNRPC_SVC_H */