[mirror_ubuntu-artful-kernel.git] / fs / nfs / callback_proc.c

/*
 * linux/fs/nfs/callback_proc.c
 *
 * Copyright (C) 2004 Trond Myklebust
 *
 * NFSv4 callback procedures
 */
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/slab.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "internal.h"
#include "pnfs.h"

#ifdef NFS_DEBUG
#define NFSDBG_FACILITY NFSDBG_CALLBACK
#endif

__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
			     struct cb_getattrres *res,
			     struct cb_process_state *cps)
{
	struct nfs_delegation *delegation;
	struct nfs_inode *nfsi;
	struct inode *inode;

	res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
		goto out;

	res->bitmap[0] = res->bitmap[1] = 0;
	res->status = htonl(NFS4ERR_BADHANDLE);

	dprintk("NFS: GETATTR callback request from %s\n",
		rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	inode = nfs_delegation_find_inode(cps->clp, &args->fh);
	if (inode == NULL)
		goto out;
	nfsi = NFS_I(inode);
	rcu_read_lock();
	delegation = rcu_dereference(nfsi->delegation);
	if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
		goto out_iput;
	res->size = i_size_read(inode);
	res->change_attr = delegation->change_attr;
	if (nfsi->npages != 0)
		res->change_attr++;
	res->ctime = inode->i_ctime;
	res->mtime = inode->i_mtime;
	res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
		args->bitmap[0];
	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
		args->bitmap[1];
	res->status = 0;
out_iput:
	rcu_read_unlock();
	iput(inode);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
	return res->status;
}

__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
			    struct cb_process_state *cps)
{
	struct inode *inode;
	__be32 res;
	
	res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
		goto out;

	dprintk("NFS: RECALL callback request from %s\n",
		rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	res = htonl(NFS4ERR_BADHANDLE);
	inode = nfs_delegation_find_inode(cps->clp, &args->fh);
	if (inode == NULL)
		goto out;
	/* Set up a helper thread to actually return the delegation */
	switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
	case 0:
		res = 0;
		break;
	case -ENOENT:
		if (res != 0)
			res = htonl(NFS4ERR_BAD_STATEID);
		break;
	default:
		res = htonl(NFS4ERR_RESOURCE);
	}
	iput(inode);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
	return res;
}

int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
{
	if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data,
					 sizeof(delegation->stateid.data)) != 0)
		return 0;
	return 1;
}

#if defined(CONFIG_NFS_V4_1)

static u32 initiate_file_draining(struct nfs_client *clp,
				  struct cb_layoutrecallargs *args)
{
	struct nfs_server *server;
	struct pnfs_layout_hdr *lo;
	struct inode *ino;
	bool found = false;
	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
	LIST_HEAD(free_me_list);

	spin_lock(&clp->cl_lock);
	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
		list_for_each_entry(lo, &server->layouts, plh_layouts) {
			if (nfs_compare_fh(&args->cbl_fh,
					   &NFS_I(lo->plh_inode)->fh))
				continue;
			ino = igrab(lo->plh_inode);
			if (!ino)
				continue;
			found = true;
			/* Without this, layout can be freed as soon
			 * as we release cl_lock.
			 */
			get_layout_hdr(lo);
			break;
		}
		if (found)
			break;
	}
	rcu_read_unlock();
	spin_unlock(&clp->cl_lock);

	if (!found)
		return NFS4ERR_NOMATCHING_LAYOUT;

	spin_lock(&ino->i_lock);
	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
	    mark_matching_lsegs_invalid(lo, &free_me_list,
					&args->cbl_range))
		rv = NFS4ERR_DELAY;
	else
		rv = NFS4ERR_NOMATCHING_LAYOUT;
	pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
	spin_unlock(&ino->i_lock);
	pnfs_free_lseg_list(&free_me_list);
	put_layout_hdr(lo);
	iput(ino);
	return rv;
}

static u32 initiate_bulk_draining(struct nfs_client *clp,
				  struct cb_layoutrecallargs *args)
{
	struct nfs_server *server;
	struct pnfs_layout_hdr *lo;
	struct inode *ino;
	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
	struct pnfs_layout_hdr *tmp;
	LIST_HEAD(recall_list);
	LIST_HEAD(free_me_list);
	struct pnfs_layout_range range = {
		.iomode = IOMODE_ANY,
		.offset = 0,
		.length = NFS4_MAX_UINT64,
	};

	spin_lock(&clp->cl_lock);
	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
		if ((args->cbl_recall_type == RETURN_FSID) &&
		    memcmp(&server->fsid, &args->cbl_fsid,
			   sizeof(struct nfs_fsid)))
			continue;

		list_for_each_entry(lo, &server->layouts, plh_layouts) {
			if (!igrab(lo->plh_inode))
				continue;
			get_layout_hdr(lo);
			BUG_ON(!list_empty(&lo->plh_bulk_recall));
			list_add(&lo->plh_bulk_recall, &recall_list);
		}
	}
	rcu_read_unlock();
	spin_unlock(&clp->cl_lock);

	list_for_each_entry_safe(lo, tmp,
				 &recall_list, plh_bulk_recall) {
		ino = lo->plh_inode;
		spin_lock(&ino->i_lock);
		set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
		if (mark_matching_lsegs_invalid(lo, &free_me_list, &range))
			rv = NFS4ERR_DELAY;
		list_del_init(&lo->plh_bulk_recall);
		spin_unlock(&ino->i_lock);
		pnfs_free_lseg_list(&free_me_list);
		put_layout_hdr(lo);
		iput(ino);
	}
	return rv;
}

static u32 do_callback_layoutrecall(struct nfs_client *clp,
				    struct cb_layoutrecallargs *args)
{
	u32 res = NFS4ERR_DELAY;

	dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
	if (test_and_set_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state))
		goto out;
	if (args->cbl_recall_type == RETURN_FILE)
		res = initiate_file_draining(clp, args);
	else
		res = initiate_bulk_draining(clp, args);
	clear_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state);
out:
	dprintk("%s returning %i\n", __func__, res);
	return res;

}

__be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
				  void *dummy, struct cb_process_state *cps)
{
	u32 res;

	dprintk("%s: -->\n", __func__);

	if (cps->clp)
		res = do_callback_layoutrecall(cps->clp, args);
	else
		res = NFS4ERR_OP_NOT_IN_SESSION;

	dprintk("%s: exit with status = %d\n", __func__, res);
	return cpu_to_be32(res);
}

static void pnfs_recall_all_layouts(struct nfs_client *clp)
{
	struct cb_layoutrecallargs args;

	/* Pretend we got a CB_LAYOUTRECALL(ALL) */
	memset(&args, 0, sizeof(args));
	args.cbl_recall_type = RETURN_ALL;
	/* FIXME we ignore errors, what should we do? */
	do_callback_layoutrecall(clp, &args);
}

__be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
				  void *dummy, struct cb_process_state *cps)
{
	int i;
	__be32 res = 0;
	struct nfs_client *clp = cps->clp;
	struct nfs_server *server = NULL;

	dprintk("%s: -->\n", __func__);

	if (!clp) {
		res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
		goto out;
	}

	for (i = 0; i < args->ndevs; i++) {
		struct cb_devicenotifyitem *dev = &args->devs[i];

		if (!server ||
		    server->pnfs_curr_ld->id != dev->cbd_layout_type) {
			rcu_read_lock();
			list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
				if (server->pnfs_curr_ld &&
				    server->pnfs_curr_ld->id == dev->cbd_layout_type) {
					rcu_read_unlock();
					goto found;
				}
			rcu_read_unlock();
			dprintk("%s: layout type %u not found\n",
				__func__, dev->cbd_layout_type);
			continue;
		}

	found:
		if (dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE)
			dprintk("%s: NOTIFY_DEVICEID4_CHANGE not supported, "
				"deleting instead\n", __func__);
		nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
	}

out:
	kfree(args->devs);
	dprintk("%s: exit with status = %u\n",
		__func__, be32_to_cpu(res));
	return res;
}

int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
{
	if (delegation == NULL)
		return 0;

	if (stateid->stateid.seqid != 0)
		return 0;
	if (memcmp(&delegation->stateid.stateid.other,
		   &stateid->stateid.other,
		   NFS4_STATEID_OTHER_SIZE))
		return 0;

	return 1;
}

/*
 * Validate the sequenceID sent by the server.
 * Return success if the sequenceID is one more than what we last saw on
 * this slot, accounting for wraparound.  Increments the slot's sequence.
 *
 * We don't yet implement a duplicate request cache, instead we set the
 * back channel ca_maxresponsesize_cached to zero. This is OK for now
 * since we only currently implement idempotent callbacks anyway.
 *
 * We have a single slot backchannel at this time, so we don't bother
 * checking the used_slots bit array on the table.  The lower layer guarantees
 * a single outstanding callback request at a time.
 */
static __be32
validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
{
	struct nfs4_slot *slot;

	dprintk("%s enter. slotid %d seqid %d\n",
		__func__, args->csa_slotid, args->csa_sequenceid);

	if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
		return htonl(NFS4ERR_BADSLOT);

	slot = tbl->slots + args->csa_slotid;
	dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);

	/* Normal */
	if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
		slot->seq_nr++;
		goto out_ok;
	}

	/* Replay */
	if (args->csa_sequenceid == slot->seq_nr) {
		dprintk("%s seqid %d is a replay\n",
			__func__, args->csa_sequenceid);
		/* Signal process_op to set this error on next op */
		if (args->csa_cachethis == 0)
			return htonl(NFS4ERR_RETRY_UNCACHED_REP);

		/* The ca_maxresponsesize_cached is 0 with no DRC */
		else if (args->csa_cachethis == 1)
			return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
	}

	/* Wraparound */
	if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
		slot->seq_nr = 1;
		goto out_ok;
	}

	/* Misordered request */
	return htonl(NFS4ERR_SEQ_MISORDERED);
out_ok:
	tbl->highest_used_slotid = args->csa_slotid;
	return htonl(NFS4_OK);
}

/*
 * For each referring call triple, check the session's slot table for
 * a match.  If the slot is in use and the sequence numbers match, the
 * client is still waiting for a response to the original request.
 */
static bool referring_call_exists(struct nfs_client *clp,
				  uint32_t nrclists,
				  struct referring_call_list *rclists)
{
	bool status = 0;
	int i, j;
	struct nfs4_session *session;
	struct nfs4_slot_table *tbl;
	struct referring_call_list *rclist;
	struct referring_call *ref;

	/*
	 * XXX When client trunking is implemented, this becomes
	 * a session lookup from within the loop
	 */
	session = clp->cl_session;
	tbl = &session->fc_slot_table;

	for (i = 0; i < nrclists; i++) {
		rclist = &rclists[i];
		if (memcmp(session->sess_id.data,
			   rclist->rcl_sessionid.data,
			   NFS4_MAX_SESSIONID_LEN) != 0)
			continue;

		for (j = 0; j < rclist->rcl_nrefcalls; j++) {
			ref = &rclist->rcl_refcalls[j];

			dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
				"slotid %u\n", __func__,
				((u32 *)&rclist->rcl_sessionid.data)[0],
				((u32 *)&rclist->rcl_sessionid.data)[1],
				((u32 *)&rclist->rcl_sessionid.data)[2],
				((u32 *)&rclist->rcl_sessionid.data)[3],
				ref->rc_sequenceid, ref->rc_slotid);

			spin_lock(&tbl->slot_tbl_lock);
			status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
				  tbl->slots[ref->rc_slotid].seq_nr ==
					ref->rc_sequenceid);
			spin_unlock(&tbl->slot_tbl_lock);
			if (status)
				goto out;
		}
	}

out:
	return status;
}

__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
			      struct cb_sequenceres *res,
			      struct cb_process_state *cps)
{
	struct nfs4_slot_table *tbl;
	struct nfs_client *clp;
	int i;
	__be32 status = htonl(NFS4ERR_BADSESSION);

	clp = nfs4_find_client_sessionid(args->csa_addr, &args->csa_sessionid);
	if (clp == NULL)
		goto out;

	tbl = &clp->cl_session->bc_slot_table;

	spin_lock(&tbl->slot_tbl_lock);
	/* state manager is resetting the session */
	if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) {
		spin_unlock(&tbl->slot_tbl_lock);
		status = htonl(NFS4ERR_DELAY);
		/* Return NFS4ERR_BADSESSION if we're draining the session
		 * in order to reset it.
		 */
		if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
			status = htonl(NFS4ERR_BADSESSION);
		goto out;
	}

	status = validate_seqid(&clp->cl_session->bc_slot_table, args);
	spin_unlock(&tbl->slot_tbl_lock);
	if (status)
		goto out;

	cps->slotid = args->csa_slotid;

	/*
	 * Check for pending referring calls.  If a match is found, a
	 * related callback was received before the response to the original
	 * call.
	 */
	if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
		status = htonl(NFS4ERR_DELAY);
		goto out;
	}

	memcpy(&res->csr_sessionid, &args->csa_sessionid,
	       sizeof(res->csr_sessionid));
	res->csr_sequenceid = args->csa_sequenceid;
	res->csr_slotid = args->csa_slotid;
	res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;

out:
	cps->clp = clp; /* put in nfs4_callback_compound */
	for (i = 0; i < args->csa_nrclists; i++)
		kfree(args->csa_rclists[i].rcl_refcalls);
	kfree(args->csa_rclists);

	if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
		cps->drc_status = status;
		status = 0;
	} else
		res->csr_status = status;

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

static bool
validate_bitmap_values(unsigned long mask)
{
	return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
}

__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
			       struct cb_process_state *cps)
{
	__be32 status;
	fmode_t flags = 0;

	status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* set in cb_sequence */
		goto out;

	dprintk("NFS: RECALL_ANY callback request from %s\n",
		rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	status = cpu_to_be32(NFS4ERR_INVAL);
	if (!validate_bitmap_values(args->craa_type_mask))
		goto out;

	status = cpu_to_be32(NFS4_OK);
	if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
		     &args->craa_type_mask))
		flags = FMODE_READ;
	if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
		     &args->craa_type_mask))
		flags |= FMODE_WRITE;
	if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
		     &args->craa_type_mask))
		pnfs_recall_all_layouts(cps->clp);
	if (flags)
		nfs_expire_all_delegation_types(cps->clp, flags);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	return status;
}

/* Reduce the fore channel's max_slots to the target value */
__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
				struct cb_process_state *cps)
{
	struct nfs4_slot_table *fc_tbl;
	__be32 status;

	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* set in cb_sequence */
		goto out;

	dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
		rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
		args->crsa_target_max_slots);

	fc_tbl = &cps->clp->cl_session->fc_slot_table;

	status = htonl(NFS4ERR_BAD_HIGH_SLOT);
	if (args->crsa_target_max_slots > fc_tbl->max_slots ||
	    args->crsa_target_max_slots < 1)
		goto out;

	status = htonl(NFS4_OK);
	if (args->crsa_target_max_slots == fc_tbl->max_slots)
		goto out;

	fc_tbl->target_max_slots = args->crsa_target_max_slots;
	nfs41_handle_recall_slot(cps->clp);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	return status;
}
#endif /* CONFIG_NFS_V4_1 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/nfs/callback_proc.c
	3	*
	4	* Copyright (C) 2004 Trond Myklebust
	5	*
	6	* NFSv4 callback procedures
	7	*/
1da177e4 LT	8	#include <linux/nfs4.h>
1da177e4 LT	9	#include <linux/nfs_fs.h>
5a0e3ad6	10	#include <linux/slab.h>
4ce79717	11	#include "nfs4_fs.h"
1da177e4 LT	12	#include "callback.h"
1da177e4 LT	13	#include "delegation.h"
24c8dbbb	14	#include "internal.h"
43f1b3da	15	#include "pnfs.h"
1da177e4	16
1d98fe67	17	#ifdef NFS_DEBUG
1da177e4	18	#define NFSDBG_FACILITY NFSDBG_CALLBACK
1d98fe67	19	#endif
c36fca52 AA	20
	21	__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
	22	struct cb_getattrres *res,
	23	struct cb_process_state *cps)
1da177e4	24	{
1da177e4 LT	25	struct nfs_delegation *delegation;
	26	struct nfs_inode *nfsi;
	27	struct inode *inode;
1d98fe67	28
c36fca52 AA	29	res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	30	if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
	31	goto out;
	32
1da177e4 LT	33	res->bitmap[0] = res->bitmap[1] = 0;
1da177e4 LT	34	res->status = htonl(NFS4ERR_BADHANDLE);
1d98fe67 CL	35
1d98fe67 CL	36	dprintk("NFS: GETATTR callback request from %s\n",
c36fca52	37	rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1d98fe67	38
c36fca52	39	inode = nfs_delegation_find_inode(cps->clp, &args->fh);
1da177e4	40	if (inode == NULL)
c36fca52	41	goto out;
1da177e4	42	nfsi = NFS_I(inode);
761fe93c TM	43	rcu_read_lock();
761fe93c TM	44	delegation = rcu_dereference(nfsi->delegation);
1da177e4 LT	45	if (delegation == NULL \|\| (delegation->type & FMODE_WRITE) == 0)
	46	goto out_iput;
	47	res->size = i_size_read(inode);
beb2a5ec TM	48	res->change_attr = delegation->change_attr;
	49	if (nfsi->npages != 0)
	50	res->change_attr++;
1da177e4 LT	51	res->ctime = inode->i_ctime;
	52	res->mtime = inode->i_mtime;
	53	res->bitmap[0] = (FATTR4_WORD0_CHANGE\|FATTR4_WORD0_SIZE) &
	54	args->bitmap[0];
	55	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA\|FATTR4_WORD1_TIME_MODIFY) &
	56	args->bitmap[1];
	57	res->status = 0;
	58	out_iput:
761fe93c	59	rcu_read_unlock();
1da177e4	60	iput(inode);
1da177e4	61	out:
3110ff80	62	dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
1da177e4 LT	63	return res->status;
	64	}
	65
c36fca52 AA	66	__be32 nfs4_callback_recall(struct cb_recallargs args, void dummy,
c36fca52 AA	67	struct cb_process_state *cps)
1da177e4	68	{
1da177e4	69	struct inode *inode;
e6f684f6	70	__be32 res;
1da177e4	71
c36fca52 AA	72	res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
c36fca52 AA	73	if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
1da177e4	74	goto out;
1d98fe67 CL	75
1d98fe67 CL	76	dprintk("NFS: RECALL callback request from %s\n",
c36fca52 AA	77	rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	78
	79	res = htonl(NFS4ERR_BADHANDLE);
	80	inode = nfs_delegation_find_inode(cps->clp, &args->fh);
	81	if (inode == NULL)
	82	goto out;
	83	/* Set up a helper thread to actually return the delegation */
	84	switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
	85	case 0:
	86	res = 0;
	87	break;
	88	case -ENOENT:
	89	if (res != 0)
	90	res = htonl(NFS4ERR_BAD_STATEID);
	91	break;
	92	default:
	93	res = htonl(NFS4ERR_RESOURCE);
	94	}
	95	iput(inode);
1da177e4	96	out:
3110ff80	97	dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
1da177e4 LT	98	return res;
1da177e4 LT	99	}
d49433e1	100
2597641d AB	101	int nfs4_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	102	{
	103	if (delegation == NULL \|\| memcmp(delegation->stateid.data, stateid->data,
	104	sizeof(delegation->stateid.data)) != 0)
	105	return 0;
	106	return 1;
	107	}
	108
d49433e1 BH	109	#if defined(CONFIG_NFS_V4_1)
d49433e1 BH	110
43f1b3da FI	111	static u32 initiate_file_draining(struct nfs_client *clp,
	112	struct cb_layoutrecallargs *args)
	113	{
6382a441	114	struct nfs_server *server;
43f1b3da FI	115	struct pnfs_layout_hdr *lo;
	116	struct inode *ino;
	117	bool found = false;
	118	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
	119	LIST_HEAD(free_me_list);
	120
	121	spin_lock(&clp->cl_lock);
6382a441 WAA	122	rcu_read_lock();
	123	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
	124	list_for_each_entry(lo, &server->layouts, plh_layouts) {
	125	if (nfs_compare_fh(&args->cbl_fh,
	126	&NFS_I(lo->plh_inode)->fh))
	127	continue;
	128	ino = igrab(lo->plh_inode);
	129	if (!ino)
	130	continue;
	131	found = true;
	132	/* Without this, layout can be freed as soon
	133	* as we release cl_lock.
	134	*/
	135	get_layout_hdr(lo);
	136	break;
	137	}
	138	if (found)
	139	break;
43f1b3da	140	}
6382a441	141	rcu_read_unlock();
43f1b3da	142	spin_unlock(&clp->cl_lock);
6382a441	143
43f1b3da FI	144	if (!found)
	145	return NFS4ERR_NOMATCHING_LAYOUT;
	146
	147	spin_lock(&ino->i_lock);
	148	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) \|\|
	149	mark_matching_lsegs_invalid(lo, &free_me_list,
778b5502	150	&args->cbl_range))
43f1b3da FI	151	rv = NFS4ERR_DELAY;
	152	else
	153	rv = NFS4ERR_NOMATCHING_LAYOUT;
	154	pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
	155	spin_unlock(&ino->i_lock);
	156	pnfs_free_lseg_list(&free_me_list);
	157	put_layout_hdr(lo);
	158	iput(ino);
	159	return rv;
	160	}
	161
	162	static u32 initiate_bulk_draining(struct nfs_client *clp,
	163	struct cb_layoutrecallargs *args)
	164	{
6382a441	165	struct nfs_server *server;
43f1b3da FI	166	struct pnfs_layout_hdr *lo;
	167	struct inode *ino;
	168	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
	169	struct pnfs_layout_hdr *tmp;
	170	LIST_HEAD(recall_list);
	171	LIST_HEAD(free_me_list);
	172	struct pnfs_layout_range range = {
	173	.iomode = IOMODE_ANY,
	174	.offset = 0,
	175	.length = NFS4_MAX_UINT64,
	176	};
	177
	178	spin_lock(&clp->cl_lock);
6382a441 WAA	179	rcu_read_lock();
6382a441 WAA	180	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
43f1b3da	181	if ((args->cbl_recall_type == RETURN_FSID) &&
6382a441 WAA	182	memcmp(&server->fsid, &args->cbl_fsid,
6382a441 WAA	183	sizeof(struct nfs_fsid)))
43f1b3da	184	continue;
6382a441 WAA	185
	186	list_for_each_entry(lo, &server->layouts, plh_layouts) {
	187	if (!igrab(lo->plh_inode))
	188	continue;
	189	get_layout_hdr(lo);
	190	BUG_ON(!list_empty(&lo->plh_bulk_recall));
	191	list_add(&lo->plh_bulk_recall, &recall_list);
	192	}
43f1b3da	193	}
6382a441	194	rcu_read_unlock();
43f1b3da	195	spin_unlock(&clp->cl_lock);
6382a441	196
43f1b3da FI	197	list_for_each_entry_safe(lo, tmp,
	198	&recall_list, plh_bulk_recall) {
	199	ino = lo->plh_inode;
	200	spin_lock(&ino->i_lock);
	201	set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
778b5502	202	if (mark_matching_lsegs_invalid(lo, &free_me_list, &range))
43f1b3da FI	203	rv = NFS4ERR_DELAY;
	204	list_del_init(&lo->plh_bulk_recall);
	205	spin_unlock(&ino->i_lock);
f49f9baa	206	pnfs_free_lseg_list(&free_me_list);
43f1b3da FI	207	put_layout_hdr(lo);
	208	iput(ino);
	209	}
43f1b3da FI	210	return rv;
	211	}
	212
	213	static u32 do_callback_layoutrecall(struct nfs_client *clp,
	214	struct cb_layoutrecallargs *args)
	215	{
	216	u32 res = NFS4ERR_DELAY;
	217
	218	dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
	219	if (test_and_set_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state))
	220	goto out;
	221	if (args->cbl_recall_type == RETURN_FILE)
	222	res = initiate_file_draining(clp, args);
	223	else
	224	res = initiate_bulk_draining(clp, args);
	225	clear_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state);
	226	out:
	227	dprintk("%s returning %i\n", __func__, res);
	228	return res;
	229
	230	}
	231
f2a62561 FI	232	__be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
	233	void dummy, struct cb_process_state cps)
	234	{
43f1b3da FI	235	u32 res;
	236
	237	dprintk("%s: -->\n", __func__);
	238
	239	if (cps->clp)
	240	res = do_callback_layoutrecall(cps->clp, args);
	241	else
	242	res = NFS4ERR_OP_NOT_IN_SESSION;
	243
	244	dprintk("%s: exit with status = %d\n", __func__, res);
	245	return cpu_to_be32(res);
f2a62561 FI	246	}
f2a62561 FI	247
36840370 AB	248	static void pnfs_recall_all_layouts(struct nfs_client *clp)
	249	{
	250	struct cb_layoutrecallargs args;
	251
	252	/* Pretend we got a CB_LAYOUTRECALL(ALL) */
	253	memset(&args, 0, sizeof(args));
	254	args.cbl_recall_type = RETURN_ALL;
	255	/* FIXME we ignore errors, what should we do? */
	256	do_callback_layoutrecall(clp, &args);
	257	}
	258
1be5683b ME	259	__be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
	260	void dummy, struct cb_process_state cps)
	261	{
	262	int i;
	263	__be32 res = 0;
	264	struct nfs_client *clp = cps->clp;
	265	struct nfs_server *server = NULL;
	266
	267	dprintk("%s: -->\n", __func__);
	268
	269	if (!clp) {
	270	res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
	271	goto out;
	272	}
	273
	274	for (i = 0; i < args->ndevs; i++) {
	275	struct cb_devicenotifyitem *dev = &args->devs[i];
	276
	277	if (!server \|\|
	278	server->pnfs_curr_ld->id != dev->cbd_layout_type) {
	279	rcu_read_lock();
	280	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
	281	if (server->pnfs_curr_ld &&
	282	server->pnfs_curr_ld->id == dev->cbd_layout_type) {
	283	rcu_read_unlock();
	284	goto found;
	285	}
	286	rcu_read_unlock();
	287	dprintk("%s: layout type %u not found\n",
	288	__func__, dev->cbd_layout_type);
	289	continue;
	290	}
	291
	292	found:
	293	if (dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE)
	294	dprintk("%s: NOTIFY_DEVICEID4_CHANGE not supported, "
	295	"deleting instead\n", __func__);
35c8bb54	296	nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
1be5683b ME	297	}
	298
	299	out:
	300	kfree(args->devs);
	301	dprintk("%s: exit with status = %u\n",
	302	__func__, be32_to_cpu(res));
	303	return res;
	304	}
	305
2597641d AB	306	int nfs41_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	307	{
	308	if (delegation == NULL)
	309	return 0;
	310
94499252	311	if (stateid->stateid.seqid != 0)
2597641d	312	return 0;
94499252 AB	313	if (memcmp(&delegation->stateid.stateid.other,
	314	&stateid->stateid.other,
	315	NFS4_STATEID_OTHER_SIZE))
2597641d AB	316	return 0;
	317
	318	return 1;
	319	}
	320
68f3f901 RL	321	/*
	322	* Validate the sequenceID sent by the server.
	323	* Return success if the sequenceID is one more than what we last saw on
	324	* this slot, accounting for wraparound. Increments the slot's sequence.
	325	*
4911096f AA	326	* We don't yet implement a duplicate request cache, instead we set the
4911096f AA	327	* back channel ca_maxresponsesize_cached to zero. This is OK for now
68f3f901 RL	328	* since we only currently implement idempotent callbacks anyway.
	329	*
	330	* We have a single slot backchannel at this time, so we don't bother
	331	* checking the used_slots bit array on the table. The lower layer guarantees
	332	* a single outstanding callback request at a time.
	333	*/
9733f0d9	334	static __be32
b2f28bd7	335	validate_seqid(struct nfs4_slot_table tbl, struct cb_sequenceargs args)
68f3f901 RL	336	{
	337	struct nfs4_slot *slot;
	338
	339	dprintk("%s enter. slotid %d seqid %d\n",
b2f28bd7	340	__func__, args->csa_slotid, args->csa_sequenceid);
68f3f901	341
b2f28bd7	342	if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
68f3f901 RL	343	return htonl(NFS4ERR_BADSLOT);
68f3f901 RL	344
b2f28bd7	345	slot = tbl->slots + args->csa_slotid;
68f3f901 RL	346	dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
	347
	348	/* Normal */
b2f28bd7	349	if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
68f3f901	350	slot->seq_nr++;
55a67399	351	goto out_ok;
68f3f901 RL	352	}
	353
	354	/* Replay */
b2f28bd7	355	if (args->csa_sequenceid == slot->seq_nr) {
4911096f	356	dprintk("%s seqid %d is a replay\n",
b2f28bd7	357	__func__, args->csa_sequenceid);
4911096f AA	358	/* Signal process_op to set this error on next op */
	359	if (args->csa_cachethis == 0)
	360	return htonl(NFS4ERR_RETRY_UNCACHED_REP);
	361
	362	/* The ca_maxresponsesize_cached is 0 with no DRC */
	363	else if (args->csa_cachethis == 1)
	364	return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
68f3f901 RL	365	}
	366
	367	/* Wraparound */
b2f28bd7	368	if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
68f3f901	369	slot->seq_nr = 1;
55a67399	370	goto out_ok;
68f3f901 RL	371	}
	372
	373	/* Misordered request */
	374	return htonl(NFS4ERR_SEQ_MISORDERED);
55a67399 TM	375	out_ok:
	376	tbl->highest_used_slotid = args->csa_slotid;
	377	return htonl(NFS4_OK);
68f3f901 RL	378	}
68f3f901 RL	379
a7989c3e MS	380	/*
	381	* For each referring call triple, check the session's slot table for
	382	* a match. If the slot is in use and the sequence numbers match, the
	383	* client is still waiting for a response to the original request.
	384	*/
	385	static bool referring_call_exists(struct nfs_client *clp,
	386	uint32_t nrclists,
	387	struct referring_call_list *rclists)
	388	{
	389	bool status = 0;
	390	int i, j;
	391	struct nfs4_session *session;
	392	struct nfs4_slot_table *tbl;
	393	struct referring_call_list *rclist;
	394	struct referring_call *ref;
	395
	396	/*
	397	* XXX When client trunking is implemented, this becomes
	398	* a session lookup from within the loop
	399	*/
	400	session = clp->cl_session;
	401	tbl = &session->fc_slot_table;
	402
	403	for (i = 0; i < nrclists; i++) {
	404	rclist = &rclists[i];
	405	if (memcmp(session->sess_id.data,
	406	rclist->rcl_sessionid.data,
	407	NFS4_MAX_SESSIONID_LEN) != 0)
	408	continue;
	409
	410	for (j = 0; j < rclist->rcl_nrefcalls; j++) {
	411	ref = &rclist->rcl_refcalls[j];
	412
	413	dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
	414	"slotid %u\n", __func__,
	415	((u32 *)&rclist->rcl_sessionid.data)[0],
	416	((u32 *)&rclist->rcl_sessionid.data)[1],
	417	((u32 *)&rclist->rcl_sessionid.data)[2],
	418	((u32 *)&rclist->rcl_sessionid.data)[3],
	419	ref->rc_sequenceid, ref->rc_slotid);
	420
	421	spin_lock(&tbl->slot_tbl_lock);
	422	status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
	423	tbl->slots[ref->rc_slotid].seq_nr ==
	424	ref->rc_sequenceid);
	425	spin_unlock(&tbl->slot_tbl_lock);
	426	if (status)
	427	goto out;
	428	}
	429	}
	430
	431	out:
	432	return status;
	433	}
	434
9733f0d9	435	__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
c36fca52 AA	436	struct cb_sequenceres *res,
c36fca52 AA	437	struct cb_process_state *cps)
d49433e1	438	{
55a67399	439	struct nfs4_slot_table *tbl;
68f3f901	440	struct nfs_client *clp;
9733f0d9	441	int i;
778be232	442	__be32 status = htonl(NFS4ERR_BADSESSION);
d49433e1	443
778be232	444	clp = nfs4_find_client_sessionid(args->csa_addr, &args->csa_sessionid);
68f3f901 RL	445	if (clp == NULL)
	446	goto out;
	447
55a67399 TM	448	tbl = &clp->cl_session->bc_slot_table;
	449
	450	spin_lock(&tbl->slot_tbl_lock);
42acd021 AA	451	/* state manager is resetting the session */
42acd021 AA	452	if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) {
55a67399 TM	453	spin_unlock(&tbl->slot_tbl_lock);
55a67399 TM	454	status = htonl(NFS4ERR_DELAY);
910ac68a TM	455	/* Return NFS4ERR_BADSESSION if we're draining the session
	456	* in order to reset it.
	457	*/
	458	if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
	459	status = htonl(NFS4ERR_BADSESSION);
42acd021 AA	460	goto out;
	461	}
	462
b2f28bd7	463	status = validate_seqid(&clp->cl_session->bc_slot_table, args);
55a67399	464	spin_unlock(&tbl->slot_tbl_lock);
68f3f901	465	if (status)
c36fca52	466	goto out;
68f3f901	467
55a67399 TM	468	cps->slotid = args->csa_slotid;
55a67399 TM	469
72ce2b3c MS	470	/*
	471	* Check for pending referring calls. If a match is found, a
	472	* related callback was received before the response to the original
	473	* call.
	474	*/
	475	if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
	476	status = htonl(NFS4ERR_DELAY);
c36fca52	477	goto out;
72ce2b3c MS	478	}
72ce2b3c MS	479
d49433e1 BH	480	memcpy(&res->csr_sessionid, &args->csa_sessionid,
	481	sizeof(res->csr_sessionid));
	482	res->csr_sequenceid = args->csa_sequenceid;
	483	res->csr_slotid = args->csa_slotid;
	484	res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	485	res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	486
68f3f901	487	out:
2c4cdf8f	488	cps->clp = clp; /* put in nfs4_callback_compound */
72ce2b3c MS	489	for (i = 0; i < args->csa_nrclists; i++)
	490	kfree(args->csa_rclists[i].rcl_refcalls);
	491	kfree(args->csa_rclists);
	492
c36fca52 AA	493	if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
	494	cps->drc_status = status;
	495	status = 0;
	496	} else
4911096f	497	res->csr_status = status;
c36fca52	498
4911096f AA	499	dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
	500	ntohl(status), ntohl(res->csr_status));
	501	return status;
d49433e1 BH	502	}
d49433e1 BH	503
36840370 AB	504	static bool
	505	validate_bitmap_values(unsigned long mask)
	506	{
	507	return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
	508	}
	509
c36fca52 AA	510	__be32 nfs4_callback_recallany(struct cb_recallanyargs args, void dummy,
c36fca52 AA	511	struct cb_process_state *cps)
31f09607	512	{
9733f0d9	513	__be32 status;
31f09607 AB	514	fmode_t flags = 0;
31f09607 AB	515
36840370	516	status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
c36fca52	517	if (!cps->clp) /* set in cb_sequence */
31f09607 AB	518	goto out;
	519
	520	dprintk("NFS: RECALL_ANY callback request from %s\n",
c36fca52	521	rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
31f09607	522
36840370 AB	523	status = cpu_to_be32(NFS4ERR_INVAL);
	524	if (!validate_bitmap_values(args->craa_type_mask))
	525	goto out;
	526
	527	status = cpu_to_be32(NFS4_OK);
31f09607 AB	528	if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
	529	&args->craa_type_mask))
	530	flags = FMODE_READ;
	531	if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
	532	&args->craa_type_mask))
	533	flags \|= FMODE_WRITE;
36840370 AB	534	if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
	535	&args->craa_type_mask))
	536	pnfs_recall_all_layouts(cps->clp);
31f09607	537	if (flags)
c36fca52	538	nfs_expire_all_delegation_types(cps->clp, flags);
31f09607 AB	539	out:
	540	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	541	return status;
	542	}
b9efa1b2 AA	543
b9efa1b2 AA	544	/* Reduce the fore channel's max_slots to the target value */
c36fca52 AA	545	__be32 nfs4_callback_recallslot(struct cb_recallslotargs args, void dummy,
c36fca52 AA	546	struct cb_process_state *cps)
b9efa1b2	547	{
b9efa1b2	548	struct nfs4_slot_table *fc_tbl;
9733f0d9	549	__be32 status;
b9efa1b2 AA	550
b9efa1b2 AA	551	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
c36fca52	552	if (!cps->clp) /* set in cb_sequence */
b9efa1b2 AA	553	goto out;
	554
	555	dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
c36fca52	556	rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
b9efa1b2 AA	557	args->crsa_target_max_slots);
b9efa1b2 AA	558
c36fca52	559	fc_tbl = &cps->clp->cl_session->fc_slot_table;
b9efa1b2 AA	560
b9efa1b2 AA	561	status = htonl(NFS4ERR_BAD_HIGH_SLOT);
bae0ac0e	562	if (args->crsa_target_max_slots > fc_tbl->max_slots \|\|
b9efa1b2	563	args->crsa_target_max_slots < 1)
c36fca52	564	goto out;
bae0ac0e AA	565
	566	status = htonl(NFS4_OK);
	567	if (args->crsa_target_max_slots == fc_tbl->max_slots)
c36fca52	568	goto out;
b9efa1b2 AA	569
b9efa1b2 AA	570	fc_tbl->target_max_slots = args->crsa_target_max_slots;
c36fca52	571	nfs41_handle_recall_slot(cps->clp);
b9efa1b2 AA	572	out:
	573	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	574	return status;
	575	}
d49433e1	576	#endif /* CONFIG_NFS_V4_1 */