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, 385 insertions, 0 deletions

diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
new file mode 100644
index 000000000000..39551657e656
--- /dev/null
+++ b/fs/nfsd/nfssvc.c
@@ -0,0 +1,385 @@
+/*
+ * linux/fs/nfsd/nfssvc.c
+ *
+ * Central processing for nfsd.
+ *
+ * Authors:     Olaf Kirch (okir@monad.swb.de)
+ *
+ * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/time.h>
+#include <linux/errno.h>
+#include <linux/nfs.h>
+#include <linux/in.h>
+#include <linux/uio.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/fs_struct.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/cache.h>
+#include <linux/nfsd/nfsd.h>
+#include <linux/nfsd/stats.h>
+#include <linux/nfsd/cache.h>
+#include <linux/lockd/bind.h>
+
+#define NFSDDBG_FACILITY        NFSDDBG_SVC
+
+/* these signals will be delivered to an nfsd thread 
+ * when handling a request
+ */
+#define ALLOWED_SIGS    (sigmask(SIGKILL))
+/* these signals will be delivered to an nfsd thread
+ * when not handling a request. i.e. when waiting
+ */
+#define SHUTDOWN_SIGS   (sigmask(SIGKILL) | sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT))
+/* if the last thread dies with SIGHUP, then the exports table is
+ * left unchanged ( like 2.4-{0-9} ).  Any other signal will clear
+ * the exports table (like 2.2).
+ */
+#define SIG_NOCLEAN     SIGHUP
+
+extern struct svc_program       nfsd_program;
+static void                     nfsd(struct svc_rqst *rqstp);
+struct timeval                  nfssvc_boot;
+static struct svc_serv          *nfsd_serv;
+static atomic_t                 nfsd_busy;
+static unsigned long            nfsd_last_call;
+static DEFINE_SPINLOCK(nfsd_call_lock);
+
+struct nfsd_list {
+        struct list_head        list;
+        struct task_struct      *task;
+};
+static struct list_head nfsd_list = LIST_HEAD_INIT(nfsd_list);
+
+/*
+ * Maximum number of nfsd processes
+ */
+#define NFSD_MAXSERVS           8192
+
+int nfsd_nrthreads(void)
+{
+        if (nfsd_serv == NULL)
+                return 0;
+        else
+                return nfsd_serv->sv_nrthreads;
+}
+
+int
+nfsd_svc(unsigned short port, int nrservs)
+{
+        int     error;
+        int     none_left;      
+        struct list_head *victim;
+        
+        lock_kernel();
+        dprintk("nfsd: creating service\n");
+        error = -EINVAL;
+        if (nrservs <= 0)
+                nrservs = 0;
+        if (nrservs > NFSD_MAXSERVS)
+                nrservs = NFSD_MAXSERVS;
+        
+        /* Readahead param cache - will no-op if it already exists */
+        error = nfsd_racache_init(2*nrservs);
+        if (error<0)
+                goto out;
+        error = nfs4_state_init();
+        if (error<0)
+                goto out;
+        if (!nfsd_serv) {
+                atomic_set(&nfsd_busy, 0);
+                error = -ENOMEM;
+                nfsd_serv = svc_create(&nfsd_program, NFSD_BUFSIZE);
+                if (nfsd_serv == NULL)
+                        goto out;
+                error = svc_makesock(nfsd_serv, IPPROTO_UDP, port);
+                if (error < 0)
+                        goto failure;
+
+#ifdef CONFIG_NFSD_TCP
+                error = svc_makesock(nfsd_serv, IPPROTO_TCP, port);
+                if (error < 0)
+                        goto failure;
+#endif
+                do_gettimeofday(&nfssvc_boot);          /* record boot time */
+        } else
+                nfsd_serv->sv_nrthreads++;
+        nrservs -= (nfsd_serv->sv_nrthreads-1);
+        while (nrservs > 0) {
+                nrservs--;
+                __module_get(THIS_MODULE);
+                error = svc_create_thread(nfsd, nfsd_serv);
+                if (error < 0) {
+                        module_put(THIS_MODULE);
+                        break;
+                }
+        }
+        victim = nfsd_list.next;
+        while (nrservs < 0 && victim != &nfsd_list) {
+                struct nfsd_list *nl =
+                        list_entry(victim,struct nfsd_list, list);
+                victim = victim->next;
+                send_sig(SIG_NOCLEAN, nl->task, 1);
+                nrservs++;
+        }
+ failure:
+        none_left = (nfsd_serv->sv_nrthreads == 1);
+        svc_destroy(nfsd_serv);         /* Release server */
+        if (none_left) {
+                nfsd_serv = NULL;
+                nfsd_racache_shutdown();
+                nfs4_state_shutdown();
+        }
+ out:
+        unlock_kernel();
+        return error;
+}
+
+static inline void
+update_thread_usage(int busy_threads)
+{
+        unsigned long prev_call;
+        unsigned long diff;
+        int decile;
+
+        spin_lock(&nfsd_call_lock);
+        prev_call = nfsd_last_call;
+        nfsd_last_call = jiffies;
+        decile = busy_threads*10/nfsdstats.th_cnt;
+        if (decile>0 && decile <= 10) {
+                diff = nfsd_last_call - prev_call;
+                if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP)
+                        nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP;
+                if (decile == 10)
+                        nfsdstats.th_fullcnt++;
+        }
+        spin_unlock(&nfsd_call_lock);
+}
+
+/*
+ * This is the NFS server kernel thread
+ */
+static void
+nfsd(struct svc_rqst *rqstp)
+{
+        struct svc_serv *serv = rqstp->rq_server;
+        struct fs_struct *fsp;
+        int             err;
+        struct nfsd_list me;
+        sigset_t shutdown_mask, allowed_mask;
+
+        /* Lock module and set up kernel thread */
+        lock_kernel();
+        daemonize("nfsd");
+
+        /* After daemonize() this kernel thread shares current->fs
+         * with the init process. We need to create files with a
+         * umask of 0 instead of init's umask. */
+        fsp = copy_fs_struct(current->fs);
+        if (!fsp) {
+                printk("Unable to start nfsd thread: out of memory\n");
+                goto out;
+        }
+        exit_fs(current);
+        current->fs = fsp;
+        current->fs->umask = 0;
+
+        siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS);
+        siginitsetinv(&allowed_mask, ALLOWED_SIGS);
+
+        nfsdstats.th_cnt++;
+
+        lockd_up();                             /* start lockd */
+
+        me.task = current;
+        list_add(&me.list, &nfsd_list);
+
+        unlock_kernel();
+
+        /*
+         * We want less throttling in balance_dirty_pages() so that nfs to
+         * localhost doesn't cause nfsd to lock up due to all the client's
+         * dirty pages.
+         */
+        current->flags |= PF_LESS_THROTTLE;
+
+        /*
+         * The main request loop
+         */
+        for (;;) {
+                /* Block all but the shutdown signals */
+                sigprocmask(SIG_SETMASK, &shutdown_mask, NULL);
+
+                /*
+                 * Find a socket with data available and call its
+                 * recvfrom routine.
+                 */
+                while ((err = svc_recv(serv, rqstp,
+                                       60*60*HZ)) == -EAGAIN)
+                        ;
+                if (err < 0)
+                        break;
+                update_thread_usage(atomic_read(&nfsd_busy));
+                atomic_inc(&nfsd_busy);
+
+                /* Lock the export hash tables for reading. */
+                exp_readlock();
+
+                /* Process request with signals blocked.  */
+                sigprocmask(SIG_SETMASK, &allowed_mask, NULL);
+
+                svc_process(serv, rqstp);
+
+                /* Unlock export hash tables */
+                exp_readunlock();
+                update_thread_usage(atomic_read(&nfsd_busy));
+                atomic_dec(&nfsd_busy);
+        }
+
+        if (err != -EINTR) {
+                printk(KERN_WARNING "nfsd: terminating on error %d\n", -err);
+        } else {
+                unsigned int    signo;
+
+                for (signo = 1; signo <= _NSIG; signo++)
+                        if (sigismember(&current->pending.signal, signo) &&
+                            !sigismember(&current->blocked, signo))
+                                break;
+                err = signo;
+        }
+
+        lock_kernel();
+
+        /* Release lockd */
+        lockd_down();
+
+        /* Check if this is last thread */
+        if (serv->sv_nrthreads==1) {
+                
+                printk(KERN_WARNING "nfsd: last server has exited\n");
+                if (err != SIG_NOCLEAN) {
+                        printk(KERN_WARNING "nfsd: unexporting all filesystems\n");
+                        nfsd_export_flush();
+                }
+                nfsd_serv = NULL;
+                nfsd_racache_shutdown();        /* release read-ahead cache */
+                nfs4_state_shutdown();
+        }
+        list_del(&me.list);
+        nfsdstats.th_cnt --;
+
+out:
+        /* Release the thread */
+        svc_exit_thread(rqstp);
+
+        /* Release module */
+        module_put_and_exit(0);
+}
+
+int
+nfsd_dispatch(struct svc_rqst *rqstp, u32 *statp)
+{
+        struct svc_procedure    *proc;
+        kxdrproc_t              xdr;
+        u32                     nfserr;
+        u32                     *nfserrp;
+
+        dprintk("nfsd_dispatch: vers %d proc %d\n",
+                                rqstp->rq_vers, rqstp->rq_proc);
+        proc = rqstp->rq_procinfo;
+
+        /* Check whether we have this call in the cache. */
+        switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
+        case RC_INTR:
+        case RC_DROPIT:
+                return 0;
+        case RC_REPLY:
+                return 1;
+        case RC_DOIT:;
+                /* do it */
+        }
+
+        /* Decode arguments */
+        xdr = proc->pc_decode;
+        if (xdr && !xdr(rqstp, (u32*)rqstp->rq_arg.head[0].iov_base,
+                        rqstp->rq_argp)) {
+                dprintk("nfsd: failed to decode arguments!\n");
+                nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
+                *statp = rpc_garbage_args;
+                return 1;
+        }
+
+        /* need to grab the location to store the status, as
+         * nfsv4 does some encoding while processing 
+         */
+        nfserrp = rqstp->rq_res.head[0].iov_base
+                + rqstp->rq_res.head[0].iov_len;
+        rqstp->rq_res.head[0].iov_len += sizeof(u32);
+
+        /* Now call the procedure handler, and encode NFS status. */
+        nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
+        if (nfserr == nfserr_jukebox && rqstp->rq_vers == 2)
+                nfserr = nfserr_dropit;
+        if (nfserr == nfserr_dropit) {
+                dprintk("nfsd: Dropping request due to malloc failure!\n");
+                nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
+                return 0;
+        }
+
+        if (rqstp->rq_proc != 0)
+                *nfserrp++ = nfserr;
+
+        /* Encode result.
+         * For NFSv2, additional info is never returned in case of an error.
+         */
+        if (!(nfserr && rqstp->rq_vers == 2)) {
+                xdr = proc->pc_encode;
+                if (xdr && !xdr(rqstp, nfserrp,
+                                rqstp->rq_resp)) {
+                        /* Failed to encode result. Release cache entry */
+                        dprintk("nfsd: failed to encode result!\n");
+                        nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
+                        *statp = rpc_system_err;
+                        return 1;
+                }
+        }
+
+        /* Store reply in cache. */
+        nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);
+        return 1;
+}
+
+extern struct svc_version nfsd_version2, nfsd_version3, nfsd_version4;
+
+static struct svc_version *     nfsd_version[] = {
+        [2] = &nfsd_version2,
+#if defined(CONFIG_NFSD_V3)
+        [3] = &nfsd_version3,
+#endif
+#if defined(CONFIG_NFSD_V4)
+        [4] = &nfsd_version4,
+#endif
+};
+
+#define NFSD_NRVERS             (sizeof(nfsd_version)/sizeof(nfsd_version[0]))
+struct svc_program              nfsd_program = {
+        .pg_prog                = NFS_PROGRAM,          /* program number */
+        .pg_nvers               = NFSD_NRVERS,          /* nr of entries in nfsd_version */
+        .pg_vers                = nfsd_version,         /* version table */
+        .pg_name                = "nfsd",               /* program name */
+        .pg_class               = "nfsd",               /* authentication class */
+        .pg_stats               = &nfsd_svcstats,       /* version table */
+        .pg_authenticate        = &svc_set_client,      /* export authentication */
+
+};