Commit 24c8dbbb authored by David Howells's avatar David Howells Committed by Trond Myklebust
Browse files

NFS: Generalise the nfs_client structure 



Generalise the nfs_client structure by:

 (1) Moving nfs_client to a more general place (nfs_fs_sb.h).

 (2) Renaming its maintenance routines to be non-NFS4 specific.

 (3) Move those maintenance routines to a new non-NFS4 specific file (client.c)
     and move the declarations to internal.h.

 (4) Make nfs_find/get_client() take a full sockaddr_in to include the port
     number (will be required for NFS2/3).

 (5) Make nfs_find/get_client() take the NFS protocol version (again will be
     required to differentiate NFS2, 3 & 4 client records).

Also:

 (6) Make nfs_client construction proceed akin to inodes, marking them as under
     construction and providing a function to indicate completion.

 (7) Make nfs_get_client() wait interruptibly if it finds a client that it can
     share, but that client is currently being constructed.

 (8) Make nfs4_create_client() use (6) and (7) instead of locking cl_sem.

Signed-Off-By: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent e9326dca

fs/nfs/Makefile

+3 −3
Original line number Diff line number Diff line
@@ -4,9 +4,9 @@ 


obj-$(CONFIG_NFS_FS) += nfs.o



nfs-y 			:= dir.o file.o inode.o super.o nfs2xdr.o pagelist.o \

			   proc.o read.o symlink.o unlink.o write.o \

			   namespace.o

nfs-y 			:= client.o dir.o file.o inode.o super.o nfs2xdr.o \

			   pagelist.o proc.o read.o symlink.o unlink.o \

			   write.o namespace.o

nfs-$(CONFIG_ROOT_NFS)	+= nfsroot.o mount_clnt.o      

nfs-$(CONFIG_NFS_V3)	+= nfs3proc.o nfs3xdr.o

nfs-$(CONFIG_NFS_V3_ACL)	+= nfs3acl.o

fs/nfs/callback.c

+5 −4
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 


#include "nfs4_fs.h"

#include "callback.h"

#include "internal.h"



#define NFSDBG_FACILITY NFSDBG_CALLBACK
@@ -166,15 +167,15 @@ void nfs_callback_down(void) 


static int nfs_callback_authenticate(struct svc_rqst *rqstp)

{

	struct in_addr *addr = &rqstp->rq_addr.sin_addr;

	struct sockaddr_in *addr = &rqstp->rq_addr;

	struct nfs_client *clp;



	/* Don't talk to strangers */

	clp = nfs4_find_client(addr);

	clp = nfs_find_client(addr, 4);

	if (clp == NULL)

		return SVC_DROP;

	dprintk("%s: %u.%u.%u.%u NFSv4 callback!\n", __FUNCTION__, NIPQUAD(addr));

	nfs4_put_client(clp);

	dprintk("%s: %u.%u.%u.%u NFSv4 callback!\n", __FUNCTION__, NIPQUAD(addr->sin_addr));

	nfs_put_client(clp);

	switch (rqstp->rq_authop->flavour) {

		case RPC_AUTH_NULL:

			if (rqstp->rq_proc != CB_NULL)

fs/nfs/callback_proc.c

+5 −4
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include "nfs4_fs.h"

#include "callback.h"

#include "delegation.h"

#include "internal.h"



#define NFSDBG_FACILITY NFSDBG_CALLBACK
@@ -22,7 +23,7 @@ unsigned nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres 
	

	res->bitmap[0] = res->bitmap[1] = 0;

	res->status = htonl(NFS4ERR_BADHANDLE);

	clp = nfs4_find_client(&args->addr->sin_addr);

	clp = nfs_find_client(args->addr, 4);

	if (clp == NULL)

		goto out;

	inode = nfs_delegation_find_inode(clp, &args->fh);
@@ -48,7 +49,7 @@ out_iput: 
	up_read(&nfsi->rwsem);

	iput(inode);

out_putclient:

	nfs4_put_client(clp);

	nfs_put_client(clp);

out:

	dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));

	return res->status;
@@ -61,7 +62,7 @@ unsigned nfs4_callback_recall(struct cb_recallargs *args, void *dummy) 
	unsigned res;

	

	res = htonl(NFS4ERR_BADHANDLE);

	clp = nfs4_find_client(&args->addr->sin_addr);

	clp = nfs_find_client(args->addr, 4);

	if (clp == NULL)

		goto out;

	inode = nfs_delegation_find_inode(clp, &args->fh);
@@ -80,7 +81,7 @@ unsigned nfs4_callback_recall(struct cb_recallargs *args, void *dummy) 
	}

	iput(inode);

out_putclient:

	nfs4_put_client(clp);

	nfs_put_client(clp);

out:

	dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));

	return res;

fs/nfs/client.c

0 → 100644
+312 −0
Original line number Diff line number Diff line 
/* client.c: NFS client sharing and management code

 *

 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.

 * Written by David Howells (dhowells@redhat.com)

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */





#include <linux/config.h>

#include <linux/module.h>

#include <linux/init.h>



#include <linux/time.h>

#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/string.h>

#include <linux/stat.h>

#include <linux/errno.h>

#include <linux/unistd.h>

#include <linux/sunrpc/clnt.h>

#include <linux/sunrpc/stats.h>

#include <linux/sunrpc/metrics.h>

#include <linux/nfs_fs.h>

#include <linux/nfs_mount.h>

#include <linux/nfs4_mount.h>

#include <linux/lockd/bind.h>

#include <linux/smp_lock.h>

#include <linux/seq_file.h>

#include <linux/mount.h>

#include <linux/nfs_idmap.h>

#include <linux/vfs.h>

#include <linux/inet.h>

#include <linux/nfs_xdr.h>



#include <asm/system.h>



#include "nfs4_fs.h"

#include "callback.h"

#include "delegation.h"

#include "iostat.h"

#include "internal.h"



#define NFSDBG_FACILITY		NFSDBG_CLIENT



static DEFINE_SPINLOCK(nfs_client_lock);

static LIST_HEAD(nfs_client_list);

static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);



/*

 * Allocate a shared client record

 *

 * Since these are allocated/deallocated very rarely, we don't

 * bother putting them in a slab cache...

 */

static struct nfs_client *nfs_alloc_client(const char *hostname,

					   const struct sockaddr_in *addr,

					   int nfsversion)

{

	struct nfs_client *clp;

	int error;



	if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)

		goto error_0;



	error = rpciod_up();

	if (error < 0) {

		dprintk("%s: couldn't start rpciod! Error = %d\n",

				__FUNCTION__, error);

		__set_bit(NFS_CS_RPCIOD, &clp->cl_res_state);

		goto error_1;

	}



	if (nfsversion == 4) {

		if (nfs_callback_up() < 0)

			goto error_2;

		__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);

	}



	atomic_set(&clp->cl_count, 1);

	clp->cl_cons_state = NFS_CS_INITING;



	clp->cl_nfsversion = nfsversion;

	memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));



	if (hostname) {

		clp->cl_hostname = kstrdup(hostname, GFP_KERNEL);

		if (!clp->cl_hostname)

			goto error_3;

	}



	INIT_LIST_HEAD(&clp->cl_superblocks);

	clp->cl_rpcclient = ERR_PTR(-EINVAL);



#ifdef CONFIG_NFS_V4

	init_rwsem(&clp->cl_sem);

	INIT_LIST_HEAD(&clp->cl_delegations);

	INIT_LIST_HEAD(&clp->cl_state_owners);

	INIT_LIST_HEAD(&clp->cl_unused);

	spin_lock_init(&clp->cl_lock);

	INIT_WORK(&clp->cl_renewd, nfs4_renew_state, clp);

	rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");

	clp->cl_boot_time = CURRENT_TIME;

	clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;

#endif



	return clp;



error_3:

	nfs_callback_down();

	__clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state);

error_2:

	rpciod_down();

	__clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state);

error_1:

	kfree(clp);

error_0:

	return NULL;

}



/*

 * Destroy a shared client record

 */

static void nfs_free_client(struct nfs_client *clp)

{

	dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion);



#ifdef CONFIG_NFS_V4

	if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) {

		while (!list_empty(&clp->cl_unused)) {

			struct nfs4_state_owner *sp;



			sp = list_entry(clp->cl_unused.next,

					struct nfs4_state_owner,

					so_list);

			list_del(&sp->so_list);

			kfree(sp);

		}

		BUG_ON(!list_empty(&clp->cl_state_owners));

		nfs_idmap_delete(clp);

	}

#endif



	/* -EIO all pending I/O */

	if (!IS_ERR(clp->cl_rpcclient))

		rpc_shutdown_client(clp->cl_rpcclient);



	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))

		nfs_callback_down();



	if (__test_and_clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state))

	rpciod_down();



	kfree(clp->cl_hostname);

	kfree(clp);



	dprintk("<-- nfs_free_client()\n");

}



/*

 * Release a reference to a shared client record

 */

void nfs_put_client(struct nfs_client *clp)

{

	dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));



	if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {

		list_del(&clp->cl_share_link);

		spin_unlock(&nfs_client_lock);



		BUG_ON(!list_empty(&clp->cl_superblocks));



		nfs_free_client(clp);

	}

}



/*

 * Find a client by address

 * - caller must hold nfs_client_lock

 */

static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion)

{

	struct nfs_client *clp;



	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {

		/* Different NFS versions cannot share the same nfs_client */

		if (clp->cl_nfsversion != nfsversion)

			continue;



		if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr,

			   sizeof(clp->cl_addr.sin_addr)) != 0)

			continue;



		if (clp->cl_addr.sin_port == addr->sin_port)

			goto found;

	}



	return NULL;



found:

	atomic_inc(&clp->cl_count);

	return clp;

}



/*

 * Find a client by IP address and protocol version

 * - returns NULL if no such client

 */

struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion)

{

	struct nfs_client *clp;



	spin_lock(&nfs_client_lock);

	clp = __nfs_find_client(addr, nfsversion);

	spin_unlock(&nfs_client_lock);



	BUG_ON(clp->cl_cons_state == 0);



	return clp;

}



/*

 * Look up a client by IP address and protocol version

 * - creates a new record if one doesn't yet exist

 */

struct nfs_client *nfs_get_client(const char *hostname,

				  const struct sockaddr_in *addr,

				  int nfsversion)

{

	struct nfs_client *clp, *new = NULL;

	int error;



	dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n",

		hostname ?: "", NIPQUAD(addr->sin_addr),

		addr->sin_port, nfsversion);



	/* see if the client already exists */

	do {

		spin_lock(&nfs_client_lock);



		clp = __nfs_find_client(addr, nfsversion);

		if (clp)

			goto found_client;

		if (new)

			goto install_client;



		spin_unlock(&nfs_client_lock);



		new = nfs_alloc_client(hostname, addr, nfsversion);

	} while (new);



	return ERR_PTR(-ENOMEM);



	/* install a new client and return with it unready */

install_client:

	clp = new;

	list_add(&clp->cl_share_link, &nfs_client_list);

	spin_unlock(&nfs_client_lock);

	dprintk("--> nfs_get_client() = %p [new]\n", clp);

	return clp;



	/* found an existing client

	 * - make sure it's ready before returning

	 */

found_client:

	spin_unlock(&nfs_client_lock);



	if (new)

		nfs_free_client(new);



	if (clp->cl_cons_state == NFS_CS_INITING) {

		DECLARE_WAITQUEUE(myself, current);



		add_wait_queue(&nfs_client_active_wq, &myself);



		for (;;) {

			set_current_state(TASK_INTERRUPTIBLE);

			if (signal_pending(current) ||

			    clp->cl_cons_state > NFS_CS_READY)

				break;

			schedule();

		}



		remove_wait_queue(&nfs_client_active_wq, &myself);



		if (signal_pending(current)) {

			nfs_put_client(clp);

			return ERR_PTR(-ERESTARTSYS);

		}

	}



	if (clp->cl_cons_state < NFS_CS_READY) {

		error = clp->cl_cons_state;

		nfs_put_client(clp);

		return ERR_PTR(error);

	}



	dprintk("--> nfs_get_client() = %p [share]\n", clp);

	return clp;

}



/*

 * Mark a server as ready or failed

 */

void nfs_mark_client_ready(struct nfs_client *clp, int state)

{

	clp->cl_cons_state = state;

	wake_up_all(&nfs_client_active_wq);

}

fs/nfs/delegation.c

+5 −4
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 


#include "nfs4_fs.h"

#include "delegation.h"

#include "internal.h"



static struct nfs_delegation *nfs_alloc_delegation(void)

{
@@ -145,7 +146,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct 
					sizeof(delegation->stateid)) != 0 ||

				delegation->type != nfsi->delegation->type) {

			printk("%s: server %u.%u.%u.%u, handed out a duplicate delegation!\n",

					__FUNCTION__, NIPQUAD(clp->cl_addr));

					__FUNCTION__, NIPQUAD(clp->cl_addr.sin_addr));

			status = -EIO;

		}

	}
@@ -254,7 +255,7 @@ restart: 
	}

out:

	spin_unlock(&clp->cl_lock);

	nfs4_put_client(clp);

	nfs_put_client(clp);

	module_put_and_exit(0);

}
@@ -266,10 +267,10 @@ void nfs_expire_all_delegations(struct nfs_client *clp) 
	atomic_inc(&clp->cl_count);

	task = kthread_run(nfs_do_expire_all_delegations, clp,

			"%u.%u.%u.%u-delegreturn",

			NIPQUAD(clp->cl_addr));

			NIPQUAD(clp->cl_addr.sin_addr));

	if (!IS_ERR(task))

		return;

	nfs4_put_client(clp);

	nfs_put_client(clp);

	module_put(THIS_MODULE);

}

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