nfs4state.c 30.3 KB
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/*
 *  fs/nfs/nfs4state.c
 *
 *  Client-side XDR for NFSv4.
 *
 *  Copyright (c) 2002 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Implementation of the NFSv4 state model.  For the time being,
 * this is minimal, but will be made much more complex in a
 * subsequent patch.
 */

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#include <linux/kernel.h>
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#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_idmap.h>
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#include <linux/kthread.h>
#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/workqueue.h>
#include <linux/bitops.h>

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#include "nfs4_fs.h"
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#include "callback.h"
#include "delegation.h"
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#include "internal.h"
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#define OPENOWNER_POOL_SIZE	8

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const nfs4_stateid zero_stateid;
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static LIST_HEAD(nfs4_clientid_list);

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static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred)
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{
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	int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK,
			nfs_callback_tcpport, cred);
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	if (status == 0)
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		status = nfs4_proc_setclientid_confirm(clp, cred);
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	if (status == 0)
		nfs4_schedule_state_renewal(clp);
	return status;
}

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static struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
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{
	struct rpc_cred *cred = NULL;

	if (clp->cl_machine_cred != NULL)
		cred = get_rpccred(clp->cl_machine_cred);
	return cred;
}

static void nfs4_clear_machine_cred(struct nfs_client *clp)
{
	struct rpc_cred *cred;

	spin_lock(&clp->cl_lock);
	cred = clp->cl_machine_cred;
	clp->cl_machine_cred = NULL;
	spin_unlock(&clp->cl_lock);
	if (cred != NULL)
		put_rpccred(cred);
}

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struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
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{
	struct nfs4_state_owner *sp;
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	struct rb_node *pos;
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	struct rpc_cred *cred = NULL;

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	for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
		sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
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		if (list_empty(&sp->so_states))
			continue;
		cred = get_rpccred(sp->so_cred);
		break;
	}
	return cred;
}

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static struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
{
	struct rpc_cred *cred;

	spin_lock(&clp->cl_lock);
	cred = nfs4_get_renew_cred_locked(clp);
	spin_unlock(&clp->cl_lock);
	return cred;
}

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static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
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{
	struct nfs4_state_owner *sp;
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	struct rb_node *pos;
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	struct rpc_cred *cred;
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	spin_lock(&clp->cl_lock);
	cred = nfs4_get_machine_cred_locked(clp);
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	if (cred != NULL)
		goto out;
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	pos = rb_first(&clp->cl_state_owners);
	if (pos != NULL) {
		sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
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		cred = get_rpccred(sp->so_cred);
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	}
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out:
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	spin_unlock(&clp->cl_lock);
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	return cred;
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}

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static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
		__u64 minval, int maxbits)
{
	struct rb_node **p, *parent;
	struct nfs_unique_id *pos;
	__u64 mask = ~0ULL;

	if (maxbits < 64)
		mask = (1ULL << maxbits) - 1ULL;

	/* Ensure distribution is more or less flat */
	get_random_bytes(&new->id, sizeof(new->id));
	new->id &= mask;
	if (new->id < minval)
		new->id += minval;
retry:
	p = &root->rb_node;
	parent = NULL;

	while (*p != NULL) {
		parent = *p;
		pos = rb_entry(parent, struct nfs_unique_id, rb_node);

		if (new->id < pos->id)
			p = &(*p)->rb_left;
		else if (new->id > pos->id)
			p = &(*p)->rb_right;
		else
			goto id_exists;
	}
	rb_link_node(&new->rb_node, parent, p);
	rb_insert_color(&new->rb_node, root);
	return;
id_exists:
	for (;;) {
		new->id++;
		if (new->id < minval || (new->id & mask) != new->id) {
			new->id = minval;
			break;
		}
		parent = rb_next(parent);
		if (parent == NULL)
			break;
		pos = rb_entry(parent, struct nfs_unique_id, rb_node);
		if (new->id < pos->id)
			break;
	}
	goto retry;
}

static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
{
	rb_erase(&id->rb_node, root);
}

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static struct nfs4_state_owner *
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nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
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{
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	struct nfs_client *clp = server->nfs_client;
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	struct rb_node **p = &clp->cl_state_owners.rb_node,
		       *parent = NULL;
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	struct nfs4_state_owner *sp, *res = NULL;

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	while (*p != NULL) {
		parent = *p;
		sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);

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		if (server < sp->so_server) {
			p = &parent->rb_left;
			continue;
		}
		if (server > sp->so_server) {
			p = &parent->rb_right;
			continue;
		}
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		if (cred < sp->so_cred)
			p = &parent->rb_left;
		else if (cred > sp->so_cred)
			p = &parent->rb_right;
		else {
			atomic_inc(&sp->so_count);
			res = sp;
			break;
		}
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	}
	return res;
}

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static struct nfs4_state_owner *
nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
{
	struct rb_node **p = &clp->cl_state_owners.rb_node,
		       *parent = NULL;
	struct nfs4_state_owner *sp;

	while (*p != NULL) {
		parent = *p;
		sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);

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		if (new->so_server < sp->so_server) {
			p = &parent->rb_left;
			continue;
		}
		if (new->so_server > sp->so_server) {
			p = &parent->rb_right;
			continue;
		}
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		if (new->so_cred < sp->so_cred)
			p = &parent->rb_left;
		else if (new->so_cred > sp->so_cred)
			p = &parent->rb_right;
		else {
			atomic_inc(&sp->so_count);
			return sp;
		}
	}
	nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
	rb_link_node(&new->so_client_node, parent, p);
	rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
	return new;
}

static void
nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
{
	if (!RB_EMPTY_NODE(&sp->so_client_node))
		rb_erase(&sp->so_client_node, &clp->cl_state_owners);
	nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
}

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/*
 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 * create a new state_owner.
 *
 */
static struct nfs4_state_owner *
nfs4_alloc_state_owner(void)
{
	struct nfs4_state_owner *sp;

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	sp = kzalloc(sizeof(*sp),GFP_KERNEL);
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	if (!sp)
		return NULL;
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	spin_lock_init(&sp->so_lock);
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	INIT_LIST_HEAD(&sp->so_states);
	INIT_LIST_HEAD(&sp->so_delegations);
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	rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
	sp->so_seqid.sequence = &sp->so_sequence;
	spin_lock_init(&sp->so_sequence.lock);
	INIT_LIST_HEAD(&sp->so_sequence.list);
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	atomic_set(&sp->so_count, 1);
	return sp;
}

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static void
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nfs4_drop_state_owner(struct nfs4_state_owner *sp)
{
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	if (!RB_EMPTY_NODE(&sp->so_client_node)) {
		struct nfs_client *clp = sp->so_client;

		spin_lock(&clp->cl_lock);
		rb_erase(&sp->so_client_node, &clp->cl_state_owners);
		RB_CLEAR_NODE(&sp->so_client_node);
		spin_unlock(&clp->cl_lock);
	}
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}

/*
 * Note: must be called with clp->cl_sem held in order to prevent races
 *       with reboot recovery!
 */
struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
{
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	struct nfs_client *clp = server->nfs_client;
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	struct nfs4_state_owner *sp, *new;

	spin_lock(&clp->cl_lock);
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	sp = nfs4_find_state_owner(server, cred);
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	spin_unlock(&clp->cl_lock);
	if (sp != NULL)
		return sp;
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	new = nfs4_alloc_state_owner();
	if (new == NULL)
		return NULL;
	new->so_client = clp;
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	new->so_server = server;
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	new->so_cred = cred;
	spin_lock(&clp->cl_lock);
	sp = nfs4_insert_state_owner(clp, new);
	spin_unlock(&clp->cl_lock);
	if (sp == new)
		get_rpccred(cred);
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	else {
		rpc_destroy_wait_queue(&new->so_sequence.wait);
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		kfree(new);
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	}
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	return sp;
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}

/*
 * Must be called with clp->cl_sem held in order to avoid races
 * with state recovery...
 */
void nfs4_put_state_owner(struct nfs4_state_owner *sp)
{
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	struct nfs_client *clp = sp->so_client;
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	struct rpc_cred *cred = sp->so_cred;

	if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
		return;
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	nfs4_remove_state_owner(clp, sp);
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	spin_unlock(&clp->cl_lock);
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	rpc_destroy_wait_queue(&sp->so_sequence.wait);
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	put_rpccred(cred);
	kfree(sp);
}

static struct nfs4_state *
nfs4_alloc_open_state(void)
{
	struct nfs4_state *state;

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	state = kzalloc(sizeof(*state), GFP_KERNEL);
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	if (!state)
		return NULL;
	atomic_set(&state->count, 1);
	INIT_LIST_HEAD(&state->lock_states);
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	spin_lock_init(&state->state_lock);
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	seqlock_init(&state->seqlock);
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	return state;
}

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void
nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode)
{
	if (state->state == mode)
		return;
	/* NB! List reordering - see the reclaim code for why.  */
	if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
		if (mode & FMODE_WRITE)
			list_move(&state->open_states, &state->owner->so_states);
		else
			list_move_tail(&state->open_states, &state->owner->so_states);
	}
	state->state = mode;
}

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static struct nfs4_state *
__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
{
	struct nfs_inode *nfsi = NFS_I(inode);
	struct nfs4_state *state;

	list_for_each_entry(state, &nfsi->open_states, inode_states) {
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		if (state->owner != owner)
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			continue;
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		if (atomic_inc_not_zero(&state->count))
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			return state;
	}
	return NULL;
}

static void
nfs4_free_open_state(struct nfs4_state *state)
{
	kfree(state);
}

struct nfs4_state *
nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
{
	struct nfs4_state *state, *new;
	struct nfs_inode *nfsi = NFS_I(inode);

	spin_lock(&inode->i_lock);
	state = __nfs4_find_state_byowner(inode, owner);
	spin_unlock(&inode->i_lock);
	if (state)
		goto out;
	new = nfs4_alloc_open_state();
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	spin_lock(&owner->so_lock);
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	spin_lock(&inode->i_lock);
	state = __nfs4_find_state_byowner(inode, owner);
	if (state == NULL && new != NULL) {
		state = new;
		state->owner = owner;
		atomic_inc(&owner->so_count);
		list_add(&state->inode_states, &nfsi->open_states);
		state->inode = igrab(inode);
		spin_unlock(&inode->i_lock);
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		/* Note: The reclaim code dictates that we add stateless
		 * and read-only stateids to the end of the list */
		list_add_tail(&state->open_states, &owner->so_states);
		spin_unlock(&owner->so_lock);
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	} else {
		spin_unlock(&inode->i_lock);
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		spin_unlock(&owner->so_lock);
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		if (new)
			nfs4_free_open_state(new);
	}
out:
	return state;
}

/*
 * Beware! Caller must be holding exactly one
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 * reference to clp->cl_sem!
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 */
void nfs4_put_open_state(struct nfs4_state *state)
{
	struct inode *inode = state->inode;
	struct nfs4_state_owner *owner = state->owner;

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	if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
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		return;
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	spin_lock(&inode->i_lock);
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	list_del(&state->inode_states);
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	list_del(&state->open_states);
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	spin_unlock(&inode->i_lock);
	spin_unlock(&owner->so_lock);
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	iput(inode);
	nfs4_free_open_state(state);
	nfs4_put_state_owner(owner);
}

/*
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 * Close the current file.
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 */
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static void __nfs4_close(struct path *path, struct nfs4_state *state, mode_t mode, int wait)
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{
	struct nfs4_state_owner *owner = state->owner;
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	int call_close = 0;
	int newstate;
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	atomic_inc(&owner->so_count);
	/* Protect against nfs4_find_state() */
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	spin_lock(&owner->so_lock);
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	switch (mode & (FMODE_READ | FMODE_WRITE)) {
		case FMODE_READ:
			state->n_rdonly--;
			break;
		case FMODE_WRITE:
			state->n_wronly--;
			break;
		case FMODE_READ|FMODE_WRITE:
			state->n_rdwr--;
	}
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	newstate = FMODE_READ|FMODE_WRITE;
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	if (state->n_rdwr == 0) {
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		if (state->n_rdonly == 0) {
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			newstate &= ~FMODE_READ;
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			call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
		}
		if (state->n_wronly == 0) {
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			newstate &= ~FMODE_WRITE;
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			call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
		}
		if (newstate == 0)
			clear_bit(NFS_DELEGATED_STATE, &state->flags);
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	}
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	nfs4_state_set_mode_locked(state, newstate);
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	spin_unlock(&owner->so_lock);
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	if (!call_close) {
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		nfs4_put_open_state(state);
		nfs4_put_state_owner(owner);
	} else
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		nfs4_do_close(path, state, wait);
}

void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
{
	__nfs4_close(path, state, mode, 0);
}

void nfs4_close_sync(struct path *path, struct nfs4_state *state, mode_t mode)
{
	__nfs4_close(path, state, mode, 1);
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}

/*
 * Search the state->lock_states for an existing lock_owner
 * that is compatible with current->files
 */
static struct nfs4_lock_state *
__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
{
	struct nfs4_lock_state *pos;
	list_for_each_entry(pos, &state->lock_states, ls_locks) {
		if (pos->ls_owner != fl_owner)
			continue;
		atomic_inc(&pos->ls_count);
		return pos;
	}
	return NULL;
}

/*
 * Return a compatible lock_state. If no initialized lock_state structure
 * exists, return an uninitialized one.
 *
 */
static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
{
	struct nfs4_lock_state *lsp;
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	struct nfs_client *clp = state->owner->so_client;
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	lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
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	if (lsp == NULL)
		return NULL;
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	rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
	spin_lock_init(&lsp->ls_sequence.lock);
	INIT_LIST_HEAD(&lsp->ls_sequence.list);
	lsp->ls_seqid.sequence = &lsp->ls_sequence;
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	atomic_set(&lsp->ls_count, 1);
	lsp->ls_owner = fl_owner;
	spin_lock(&clp->cl_lock);
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	nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
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	spin_unlock(&clp->cl_lock);
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	INIT_LIST_HEAD(&lsp->ls_locks);
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	return lsp;
}

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static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
{
	struct nfs_client *clp = lsp->ls_state->owner->so_client;

	spin_lock(&clp->cl_lock);
	nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
	spin_unlock(&clp->cl_lock);
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	rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
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	kfree(lsp);
}

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/*
 * Return a compatible lock_state. If no initialized lock_state structure
 * exists, return an uninitialized one.
 *
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 * The caller must be holding clp->cl_sem
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 */
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static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
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584
{
585
	struct nfs4_lock_state *lsp, *new = NULL;
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587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605
	for(;;) {
		spin_lock(&state->state_lock);
		lsp = __nfs4_find_lock_state(state, owner);
		if (lsp != NULL)
			break;
		if (new != NULL) {
			new->ls_state = state;
			list_add(&new->ls_locks, &state->lock_states);
			set_bit(LK_STATE_IN_USE, &state->flags);
			lsp = new;
			new = NULL;
			break;
		}
		spin_unlock(&state->state_lock);
		new = nfs4_alloc_lock_state(state, owner);
		if (new == NULL)
			return NULL;
	}
	spin_unlock(&state->state_lock);
606 607
	if (new != NULL)
		nfs4_free_lock_state(new);
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	return lsp;
}

/*
612 613
 * Release reference to lock_state, and free it if we see that
 * it is no longer in use
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 */
615
void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
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616
{
617
	struct nfs4_state *state;
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619 620 621 622 623 624 625 626 627
	if (lsp == NULL)
		return;
	state = lsp->ls_state;
	if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
		return;
	list_del(&lsp->ls_locks);
	if (list_empty(&state->lock_states))
		clear_bit(LK_STATE_IN_USE, &state->flags);
	spin_unlock(&state->state_lock);
628
	nfs4_free_lock_state(lsp);
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}

631
static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
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{
633
	struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
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635 636 637
	dst->fl_u.nfs4_fl.owner = lsp;
	atomic_inc(&lsp->ls_count);
}
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639
static void nfs4_fl_release_lock(struct file_lock *fl)
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640
{
641
	nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
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}

644 645 646 647 648 649
static struct file_lock_operations nfs4_fl_lock_ops = {
	.fl_copy_lock = nfs4_fl_copy_lock,
	.fl_release_private = nfs4_fl_release_lock,
};

int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
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650
{
651 652 653 654 655 656 657 658 659 660
	struct nfs4_lock_state *lsp;

	if (fl->fl_ops != NULL)
		return 0;
	lsp = nfs4_get_lock_state(state, fl->fl_owner);
	if (lsp == NULL)
		return -ENOMEM;
	fl->fl_u.nfs4_fl.owner = lsp;
	fl->fl_ops = &nfs4_fl_lock_ops;
	return 0;
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}

663 664 665
/*
 * Byte-range lock aware utility to initialize the stateid of read/write
 * requests.
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 */
667
void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
L
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{
669
	struct nfs4_lock_state *lsp;
670
	int seq;
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672 673 674 675
	do {
		seq = read_seqbegin(&state->seqlock);
		memcpy(dst, &state->stateid, sizeof(*dst));
	} while (read_seqretry(&state->seqlock, seq));
676 677
	if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
		return;
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679 680 681 682 683
	spin_lock(&state->state_lock);
	lsp = __nfs4_find_lock_state(state, fl_owner);
	if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
		memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
	spin_unlock(&state->state_lock);
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	nfs4_put_lock_state(lsp);
}

687 688 689 690 691 692 693
struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
{
	struct nfs_seqid *new;

	new = kmalloc(sizeof(*new), GFP_KERNEL);
	if (new != NULL) {
		new->sequence = counter;
694
		INIT_LIST_HEAD(&new->list);
695 696 697 698 699
	}
	return new;
}

void nfs_free_seqid(struct nfs_seqid *seqid)
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{
701 702
	if (!list_empty(&seqid->list)) {
		struct rpc_sequence *sequence = seqid->sequence->sequence;
703

704 705 706 707 708
		spin_lock(&sequence->lock);
		list_del(&seqid->list);
		spin_unlock(&sequence->lock);
		rpc_wake_up(&sequence->wait);
	}
709
	kfree(seqid);
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}

/*
713 714 715 716
 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
 * failed with a seqid incrementing error -
 * see comments nfs_fs.h:seqid_mutating_error()
 */
717
static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
718
{
719
	BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
720 721 722 723
	switch (status) {
		case 0:
			break;
		case -NFS4ERR_BAD_SEQID:
724 725 726
			if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
				return;
			printk(KERN_WARNING "NFS: v4 server returned a bad"
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					" sequence-id error on an"
					" unconfirmed sequence %p!\n",
729
					seqid->sequence);
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
		case -NFS4ERR_STALE_CLIENTID:
		case -NFS4ERR_STALE_STATEID:
		case -NFS4ERR_BAD_STATEID:
		case -NFS4ERR_BADXDR:
		case -NFS4ERR_RESOURCE:
		case -NFS4ERR_NOFILEHANDLE:
			/* Non-seqid mutating errors */
			return;
	};
	/*
	 * Note: no locking needed as we are guaranteed to be first
	 * on the sequence list
	 */
	seqid->sequence->counter++;
}

void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
{
	if (status == -NFS4ERR_BAD_SEQID) {
		struct nfs4_state_owner *sp = container_of(seqid->sequence,
				struct nfs4_state_owner, so_seqid);
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		nfs4_drop_state_owner(sp);
752
	}
753
	nfs_increment_seqid(status, seqid);
754 755 756 757 758 759 760 761 762
}

/*
 * Increment the seqid if the LOCK/LOCKU succeeded, or
 * failed with a seqid incrementing error -
 * see comments nfs_fs.h:seqid_mutating_error()
 */
void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
{
763
	nfs_increment_seqid(status, seqid);
764 765 766 767 768 769 770 771
}

int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
{
	struct rpc_sequence *sequence = seqid->sequence->sequence;
	int status = 0;

	spin_lock(&sequence->lock);
772 773 774 775
	if (list_empty(&seqid->list))
		list_add_tail(&seqid->list, &sequence->list);
	if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
		goto unlock;
776
	rpc_sleep_on(&sequence->wait, task, NULL);
777 778
	status = -EAGAIN;
unlock:
779 780
	spin_unlock(&sequence->lock);
	return status;
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}

static int reclaimer(void *);

785
static inline void nfs4_clear_recover_bit(struct nfs_client *clp)
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{
	smp_mb__before_clear_bit();
	clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state);
	smp_mb__after_clear_bit();
	wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER);
	rpc_wake_up(&clp->cl_rpcwaitq);
}

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/*
 * State recovery routine
 */
797
static void nfs4_recover_state(struct nfs_client *clp)
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{
799
	struct task_struct *task;
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801 802
	__module_get(THIS_MODULE);
	atomic_inc(&clp->cl_count);
803 804 805
	task = kthread_run(reclaimer, clp, "%s-reclaim",
				rpc_peeraddr2str(clp->cl_rpcclient,
							RPC_DISPLAY_ADDR));
806 807
	if (!IS_ERR(task))
		return;
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	nfs4_clear_recover_bit(clp);
809
	nfs_put_client(clp);
810
	module_put(THIS_MODULE);
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}

/*
 * Schedule a state recovery attempt
 */
816
void nfs4_schedule_state_recovery(struct nfs_client *clp)
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{
	if (!clp)
		return;
820 821
	if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
		set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
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	if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
823
		nfs4_recover_state(clp);
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}

826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
{

	set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
	/* Don't recover state that expired before the reboot */
	if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
		clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
		return 0;
	}
	set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
	return 1;
}

static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
{
	set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
	clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
	set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
	return 1;
}

847
static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
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{
	struct inode *inode = state->inode;
	struct file_lock *fl;
	int status = 0;

H
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	for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
854
		if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
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			continue;
856
		if (nfs_file_open_context(fl->fl_file)->state != state)
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			continue;
		status = ops->recover_lock(state, fl);
		if (status >= 0)
			continue;
		switch (status) {
			default:
				printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
864
						__func__, status);
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			case -NFS4ERR_EXPIRED:
			case -NFS4ERR_NO_GRACE:
			case -NFS4ERR_RECLAIM_BAD:
			case -NFS4ERR_RECLAIM_CONFLICT:
869
				/* kill_proc(fl->fl_pid, SIGLOST, 1); */
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				break;
			case -NFS4ERR_STALE_CLIENTID:
				goto out_err;
		}
	}
	return 0;
out_err:
	return status;
}

880
static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
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{
	struct nfs4_state *state;
	struct nfs4_lock_state *lock;
	int status = 0;

	/* Note: we rely on the sp->so_states list being ordered 
	 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
	 * states first.
	 * This is needed to ensure that the server won't give us any
	 * read delegations that we have to return if, say, we are
	 * recovering after a network partition or a reboot from a
	 * server that doesn't support a grace period.
	 */
	list_for_each_entry(state, &sp->so_states, open_states) {
895 896
		if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
			continue;
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		if (state->state == 0)
			continue;
		status = ops->recover_open(sp, state);
		if (status >= 0) {
901 902 903 904 905
			status = nfs4_reclaim_locks(state, ops);
			if (status >= 0) {
				list_for_each_entry(lock, &state->lock_states, ls_locks) {
					if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
						printk("%s: Lock reclaim failed!\n",
906
							__func__);
907 908
				}
				continue;
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			}
		}
		switch (status) {
			default:
				printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
914
						__func__, status);
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			case -ENOENT:
916
			case -ESTALE:
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				/*
				 * Open state on this file cannot be recovered
				 * All we can do is revert to using the zero stateid.
				 */
				memset(state->stateid.data, 0,
					sizeof(state->stateid.data));
				/* Mark the file as being 'closed' */
				state->state = 0;
				break;
926 927 928 929
			case -NFS4ERR_RECLAIM_BAD:
			case -NFS4ERR_RECLAIM_CONFLICT:
				nfs4_state_mark_reclaim_nograce(sp->so_client, state);
				break;
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			case -NFS4ERR_EXPIRED:
			case -NFS4ERR_NO_GRACE:
932
				nfs4_state_mark_reclaim_nograce(sp->so_client, state);
L
Linus Torvalds 已提交
933 934 935 936 937 938 939 940 941
			case -NFS4ERR_STALE_CLIENTID:
				goto out_err;
		}
	}
	return 0;
out_err:
	return status;
}

942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957
static void nfs4_clear_open_state(struct nfs4_state *state)
{
	struct nfs4_lock_state *lock;

	clear_bit(NFS_DELEGATED_STATE, &state->flags);
	clear_bit(NFS_O_RDONLY_STATE, &state->flags);
	clear_bit(NFS_O_WRONLY_STATE, &state->flags);
	clear_bit(NFS_O_RDWR_STATE, &state->flags);
	list_for_each_entry(lock, &state->lock_states, ls_locks) {
		lock->ls_seqid.counter = 0;
		lock->ls_seqid.flags = 0;
		lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
	}
}

static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
958 959
{
	struct nfs4_state_owner *sp;
960
	struct rb_node *pos;
961 962 963
	struct nfs4_state *state;

	/* Reset all sequence ids to zero */
964 965
	for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
		sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
966 967
		sp->so_seqid.counter = 0;
		sp->so_seqid.flags = 0;
968
		spin_lock(&sp->so_lock);
969
		list_for_each_entry(state, &sp->so_states, open_states) {
970 971
			if (mark_reclaim(clp, state))
				nfs4_clear_open_state(state);
972
		}
973
		spin_unlock(&sp->so_lock);
974 975 976
	}
}

977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
{
	/* Mark all delegations for reclaim */
	nfs_delegation_mark_reclaim(clp);
	nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
}

static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
{
	struct nfs4_state_owner *sp;
	struct rb_node *pos;
	struct nfs4_state *state;

	if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
		return;

	for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
		sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
		spin_lock(&sp->so_lock);
		list_for_each_entry(state, &sp->so_states, open_states) {
			if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
				continue;
			nfs4_state_mark_reclaim_nograce(clp, state);
		}
		spin_unlock(&sp->so_lock);
	}

	nfs_delegation_reap_unclaimed(clp);
}

static void nfs_delegation_clear_all(struct nfs_client *clp)
{
	nfs_delegation_mark_reclaim(clp);
	nfs_delegation_reap_unclaimed(clp);
}

static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
{
	nfs_delegation_clear_all(clp);
	nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
}

static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp)
{
	clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
}

1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
static void nfs4_recovery_handle_error(struct nfs_client *clp, int error)
{
	switch (error) {
		case -NFS4ERR_CB_PATH_DOWN:
			set_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state);
			break;
		case -NFS4ERR_STALE_CLIENTID:
		case -NFS4ERR_LEASE_MOVED:
			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
			nfs4_state_start_reclaim_reboot(clp);
			break;
		case -NFS4ERR_EXPIRED:
			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
			nfs4_state_start_reclaim_nograce(clp);
	}
}

1041
static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1042
{
1043
	struct rb_node *pos;
L
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1044 1045
	int status = 0;

1046 1047 1048 1049 1050 1051 1052
	/* Note: list is protected by exclusive lock on cl->cl_sem */
	for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
		struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
		status = nfs4_reclaim_open_state(sp, ops);
		if (status < 0)
			break;
	}
1053
	nfs4_recovery_handle_error(clp, status);
1054 1055 1056 1057 1058 1059 1060
	return status;
}

static int nfs4_check_lease(struct nfs_client *clp)
{
	struct rpc_cred *cred;
	int status = -NFS4ERR_EXPIRED;
L
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1062 1063 1064 1065 1066
	/* Are there any open files on this volume? */
	cred = nfs4_get_renew_cred(clp);
	if (cred != NULL) {
		/* Yes there are: try to renew the old lease */
		status = nfs4_proc_renew(clp, cred);
1067
		put_rpccred(cred);
1068
		nfs4_recovery_handle_error(clp, status);
1069
		return status;
1070
	}
1071 1072 1073

	/* "reboot" to ensure we clear all state on the server */
	clp->cl_boot_time = CURRENT_TIME;
1074
	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1075 1076 1077 1078 1079 1080 1081 1082
	return status;
}

static int nfs4_reclaim_lease(struct nfs_client *clp)
{
	struct rpc_cred *cred;
	int status = -ENOENT;

1083
	cred = nfs4_get_setclientid_cred(clp);
1084 1085 1086
	if (cred != NULL) {
		status = nfs4_init_client(clp, cred);
		put_rpccred(cred);
1087 1088 1089
		/* Handle case where the user hasn't set up machine creds */
		if (status == -EACCES && cred == clp->cl_machine_cred) {
			nfs4_clear_machine_cred(clp);
1090
			status = -EAGAIN;
1091
		}
1092
	}
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
	return status;
}

static int reclaimer(void *ptr)
{
	struct nfs_client *clp = ptr;
	int status = 0;

	allow_signal(SIGKILL);

	/* Ensure exclusive access to NFSv4 state */
	down_write(&clp->cl_sem);
	while (!list_empty(&clp->cl_superblocks)) {
1106 1107 1108 1109 1110 1111 1112 1113 1114
		if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
			/* We're going to have to re-establish a clientid */
			status = nfs4_reclaim_lease(clp);
			if (status) {
				set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
				if (status == -EAGAIN)
					continue;
				goto out_error;
			}
1115 1116 1117 1118 1119 1120 1121
			clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
		}

		if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
			status = nfs4_check_lease(clp);
			if (status != 0)
				continue;
1122
		}
1123

1124 1125 1126 1127
		/* First recover reboot state... */
		if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
			/* Note: list is protected by exclusive lock on cl->cl_sem */
			status = nfs4_do_reclaim(clp, &nfs4_reboot_recovery_ops);
1128
			if (status == -NFS4ERR_STALE_CLIENTID)
1129
				continue;
1130 1131
			nfs4_state_end_reclaim_reboot(clp);
			continue;
1132 1133
		}

1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
		/* Now recover expired state... */
		if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
			/* Note: list is protected by exclusive lock on cl->cl_sem */
			status = nfs4_do_reclaim(clp, &nfs4_nograce_recovery_ops);
			if (status < 0) {
				set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
				if (status == -NFS4ERR_STALE_CLIENTID)
					continue;
				if (status == -NFS4ERR_EXPIRED)
					continue;
				goto out_error;
			} else
				nfs4_state_end_reclaim_nograce(clp);
			continue;
L
Linus Torvalds 已提交
1148
		}
1149
		break;
L
Linus Torvalds 已提交
1150 1151 1152
	}
out:
	up_write(&clp->cl_sem);
1153
	if (test_and_clear_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state))
L
Linus Torvalds 已提交
1154
		nfs_handle_cb_pathdown(clp);
T
Trond Myklebust 已提交
1155
	nfs4_clear_recover_bit(clp);
1156
	nfs_put_client(clp);
1157
	module_put_and_exit(0);
L
Linus Torvalds 已提交
1158 1159
	return 0;
out_error:
1160 1161
	printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %s"
			" with error %d\n", clp->cl_hostname, -status);
1162 1163
	if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
		nfs4_state_end_reclaim_reboot(clp);
L
Linus Torvalds 已提交
1164 1165 1166 1167 1168 1169 1170 1171
	goto out;
}

/*
 * Local variables:
 *  c-basic-offset: 8
 * End:
 */