Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 306 insertions, 0 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
new file mode 100644
index 000000000000..37003970cf2e
--- /dev/null
+++ b/include/linux/sunrpc/svc.h
@@ -0,0 +1,306 @@
+/*
+ * linux/include/linux/sunrpc/svc.h
+ *
+ * RPC server declarations.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+
+#ifndef SUNRPC_SVC_H
+#define SUNRPC_SVC_H
+
+#include <linux/in.h>
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+
+/*
+ * 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 list_head        sv_threads;     /* idle server threads */
+        struct list_head        sv_sockets;     /* pending sockets */
+        struct svc_program *    sv_program;     /* RPC program */
+        struct svc_stat *       sv_stats;       /* RPC statistics */
+        spinlock_t              sv_lock;
+        unsigned int            sv_nrthreads;   /* # of server threads */
+        unsigned int            sv_bufsz;       /* datagram buffer size */
+        unsigned int            sv_xdrsize;     /* XDR buffer size */
+
+        struct list_head        sv_permsocks;   /* all permanent sockets */
+        struct list_head        sv_tempsocks;   /* all temporary sockets */
+        int                     sv_tmpcnt;      /* count of temporary sockets */
+
+        char *                  sv_name;        /* service name */
+};
+
+/*
+ * 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.
+ */
+#define RPCSVC_MAXPAYLOAD       (64*1024u)
+
+/*
+ * RPC Requsts and replies are stored in one or more pages.
+ * We maintain an array of pages for each server thread.
+ * Requests are copied into these pages as they arrive.  Remaining
+ * pages are available to write the reply into.
+ *
+ * Pages are sent using ->sendpage so each server thread needs to
+ * allocate more to replace those used in sending.  To help keep track
+ * of these pages we have a receive list where all pages initialy live,
+ * and a send list where pages are moved to when there are to be part
+ * of a reply.
+ *
+ * We use xdr_buf for holding responses as it fits well with NFS
+ * read responses (that have a header, and some data pages, and possibly
+ * a tail) and means we can share some 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.
+ *
+ * Each request/reply pair can have at most one "payload", plus two pages,
+ * one for the request, and one for the reply.
+ */
+#define RPCSVC_MAXPAGES         ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE + 2)
+
+static inline u32 svc_getu32(struct kvec *iov)
+{
+        u32 val, *vp;
+        vp = iov->iov_base;
+        val = *vp++;
+        iov->iov_base = (void*)vp;
+        iov->iov_len -= sizeof(u32);
+        return val;
+}
+
+static inline void svc_ungetu32(struct kvec *iov)
+{
+        u32 *vp = (u32 *)iov->iov_base;
+        iov->iov_base = (void *)(vp - 1);
+        iov->iov_len += sizeof(*vp);
+}
+
+static inline void svc_putu32(struct kvec *iov, u32 val)
+{
+        u32 *vp = iov->iov_base + iov->iov_len;
+        *vp = val;
+        iov->iov_len += sizeof(u32);
+}
+
+        
+/*
+ * The context of a single thread, including the request currently being
+ * processed.
+ * NOTE: First two items must be prev/next.
+ */
+struct svc_rqst {
+        struct list_head        rq_list;        /* idle list */
+        struct svc_sock *       rq_sock;        /* socket */
+        struct sockaddr_in      rq_addr;        /* peer address */
+        int                     rq_addrlen;
+
+        struct svc_serv *       rq_server;      /* RPC service definition */
+        struct svc_procedure *  rq_procinfo;    /* procedure info */
+        struct auth_ops *       rq_authop;      /* authentication flavour */
+        struct svc_cred         rq_cred;        /* auth info */
+        struct sk_buff *        rq_skbuff;      /* fast recv inet buffer */
+        struct svc_deferred_req*rq_deferred;    /* deferred request we are replaying */
+
+        struct xdr_buf          rq_arg;
+        struct xdr_buf          rq_res;
+        struct page *           rq_argpages[RPCSVC_MAXPAGES];
+        struct page *           rq_respages[RPCSVC_MAXPAGES];
+        int                     rq_restailpage;
+        short                   rq_argused;     /* pages used for argument */
+        short                   rq_arghi;       /* pages available in argument page list */
+        short                   rq_resused;     /* pages used for result */
+
+        u32                     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 short
+                                rq_secure  : 1; /* secure port */
+
+
+        __u32                   rq_daddr;       /* dest addr of request - reply from here */
+
+        void *                  rq_argp;        /* decoded arguments */
+        void *                  rq_resp;        /* xdr'd results */
+        void *                  rq_auth_data;   /* flavor-specific data */
+
+        int                     rq_reserved;    /* space on socket outq
+                                                 * reserved for this request
+                                                 */
+
+        struct cache_req        rq_chandle;     /* handle passed to caches for 
+                                                 * request delaying 
+                                                 */
+        /* Catering to nfsd */
+        struct auth_domain *    rq_client;      /* RPC peer info */
+        struct svc_cacherep *   rq_cacherep;    /* cache info */
+        struct knfsd_fh *       rq_reffh;       /* Referrence filehandle, used to
+                                                 * determine what device number
+                                                 * to report (real or virtual)
+                                                 */
+
+        wait_queue_head_t       rq_wait;        /* synchronization */
+};
+
+/*
+ * Check buffer bounds after decoding arguments
+ */
+static inline int
+xdr_argsize_check(struct svc_rqst *rqstp, u32 *p)
+{
+        char *cp = (char *)p;
+        struct kvec *vec = &rqstp->rq_arg.head[0];
+        return cp - (char*)vec->iov_base <= vec->iov_len;
+}
+
+static inline int
+xdr_ressize_check(struct svc_rqst *rqstp, u32 *p)
+{
+        struct kvec *vec = &rqstp->rq_res.head[0];
+        char *cp = (char*)p;
+
+        vec->iov_len = cp - (char*)vec->iov_base;
+
+        return vec->iov_len <= PAGE_SIZE;
+}
+
+static inline int svc_take_page(struct svc_rqst *rqstp)
+{
+        if (rqstp->rq_arghi <= rqstp->rq_argused)
+                return -ENOMEM;
+        rqstp->rq_arghi--;
+        rqstp->rq_respages[rqstp->rq_resused] =
+                rqstp->rq_argpages[rqstp->rq_arghi];
+        rqstp->rq_resused++;
+        return 0;
+}
+
+static inline void svc_pushback_allpages(struct svc_rqst *rqstp)
+{
+        while (rqstp->rq_resused) {
+                if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
+                        continue;
+                rqstp->rq_argpages[rqstp->rq_arghi++] =
+                        rqstp->rq_respages[rqstp->rq_resused];
+                rqstp->rq_respages[rqstp->rq_resused] = NULL;
+        }
+}
+
+static inline void svc_pushback_unused_pages(struct svc_rqst *rqstp)
+{
+        while (rqstp->rq_resused &&
+               rqstp->rq_res.pages != &rqstp->rq_respages[rqstp->rq_resused]) {
+
+                if (rqstp->rq_respages[--rqstp->rq_resused] != NULL) {
+                        rqstp->rq_argpages[rqstp->rq_arghi++] =
+                                rqstp->rq_respages[rqstp->rq_resused];
+                        rqstp->rq_respages[rqstp->rq_resused] = NULL;
+                }
+        }
+}
+
+static inline void svc_free_allpages(struct svc_rqst *rqstp)
+{
+        while (rqstp->rq_resused) {
+                if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
+                        continue;
+                put_page(rqstp->rq_respages[rqstp->rq_resused]);
+                rqstp->rq_respages[rqstp->rq_resused] = NULL;
+        }
+}
+
+struct svc_deferred_req {
+        u32                     prot;   /* protocol (UDP or TCP) */
+        struct sockaddr_in      addr;
+        struct svc_sock         *svsk;  /* where reply must go */
+        struct cache_deferred_req handle;
+        int                     argslen;
+        u32                     args[0];
+};
+
+/*
+ * RPC program
+ */
+struct svc_program {
+        u32                     pg_prog;        /* program number */
+        unsigned int            pg_lovers;      /* lowest version */
+        unsigned int            pg_hivers;      /* lowest version */
+        unsigned int            pg_nvers;       /* number of versions */
+        struct svc_version **   pg_vers;        /* version array */
+        char *                  pg_name;        /* service name */
+        char *                  pg_class;       /* class name: services sharing authentication */
+        struct svc_stat *       pg_stats;       /* rpc statistics */
+        int                     (*pg_authenticate)(struct svc_rqst *);
+};
+
+/*
+ * RPC program version
+ */
+struct svc_version {
+        u32                     vs_vers;        /* version number */
+        u32                     vs_nproc;       /* number of procedures */
+        struct svc_procedure *  vs_proc;        /* per-procedure info */
+        u32                     vs_xdrsize;     /* xdrsize needed for this version */
+
+        /* Override dispatch function (e.g. when caching replies).
+         * A return value of 0 means drop the request. 
+         * vs_dispatch == NULL means use default dispatcher.
+         */
+        int                     (*vs_dispatch)(struct svc_rqst *, u32 *);
+};
+
+/*
+ * RPC procedure info
+ */
+typedef int     (*svc_procfunc)(struct svc_rqst *, void *argp, void *resp);
+struct svc_procedure {
+        svc_procfunc            pc_func;        /* process the request */
+        kxdrproc_t              pc_decode;      /* XDR decode args */
+        kxdrproc_t              pc_encode;      /* XDR encode result */
+        kxdrproc_t              pc_release;     /* XDR free result */
+        unsigned int            pc_argsize;     /* argument struct size */
+        unsigned int            pc_ressize;     /* result struct size */
+        unsigned int            pc_count;       /* call count */
+        unsigned int            pc_cachetype;   /* cache info (NFS) */
+        unsigned int            pc_xdrressize;  /* maximum size of XDR reply */
+};
+
+/*
+ * This is the RPC server thread function prototype
+ */
+typedef void            (*svc_thread_fn)(struct svc_rqst *);
+
+/*
+ * Function prototypes.
+ */
+struct svc_serv *  svc_create(struct svc_program *, unsigned int);
+int                svc_create_thread(svc_thread_fn, struct svc_serv *);
+void               svc_exit_thread(struct svc_rqst *);
+void               svc_destroy(struct svc_serv *);
+int                svc_process(struct svc_serv *, struct svc_rqst *);
+int                svc_register(struct svc_serv *, int, unsigned short);
+void               svc_wake_up(struct svc_serv *);
+void               svc_reserve(struct svc_rqst *rqstp, int space);
+
+#endif /* SUNRPC_SVC_H */