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 00000000000..39551657e65
--- /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 */
+
+};