[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 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);
	list_for_each_entry(lo, &clp->cl_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;
	}
	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 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);
	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
		if ((args->cbl_recall_type == RETURN_FSID) &&
		    memcmp(&NFS_SERVER(lo->plh_inode)->fsid,
			   &args->cbl_fsid, sizeof(struct nfs_fsid)))
			continue;
		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);
	}
	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++;
		return htonl(NFS4_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;
		return htonl(NFS4_OK);
	}

	/* Misordered request */
	return htonl(NFS4ERR_SEQ_MISORDERED);
}

/*
 * 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 nfs_client *clp;
	int i;
	__be32 status = htonl(NFS4ERR_BADSESSION);

	cps->clp = NULL;

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

	/* state manager is resetting the session */
	if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) {
		status = NFS4ERR_DELAY;
		goto out;
	}

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

	/*
	 * 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;
	nfs4_cb_take_slot(clp);

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	{
	114	struct pnfs_layout_hdr *lo;
	115	struct inode *ino;
	116	bool found = false;
	117	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
	118	LIST_HEAD(free_me_list);
	119
	120	spin_lock(&clp->cl_lock);
	121	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
	122	if (nfs_compare_fh(&args->cbl_fh,
	123	&NFS_I(lo->plh_inode)->fh))
	124	continue;
	125	ino = igrab(lo->plh_inode);
	126	if (!ino)
	127	continue;
	128	found = true;
	129	/* Without this, layout can be freed as soon
	130	* as we release cl_lock.
	131	*/
	132	get_layout_hdr(lo);
	133	break;
	134	}
	135	spin_unlock(&clp->cl_lock);
	136	if (!found)
	137	return NFS4ERR_NOMATCHING_LAYOUT;
	138
	139	spin_lock(&ino->i_lock);
	140	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) \|\|
	141	mark_matching_lsegs_invalid(lo, &free_me_list,
778b5502	142	&args->cbl_range))
43f1b3da FI	143	rv = NFS4ERR_DELAY;
	144	else
	145	rv = NFS4ERR_NOMATCHING_LAYOUT;
	146	pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
	147	spin_unlock(&ino->i_lock);
	148	pnfs_free_lseg_list(&free_me_list);
	149	put_layout_hdr(lo);
	150	iput(ino);
	151	return rv;
	152	}
	153
	154	static u32 initiate_bulk_draining(struct nfs_client *clp,
	155	struct cb_layoutrecallargs *args)
	156	{
	157	struct pnfs_layout_hdr *lo;
	158	struct inode *ino;
	159	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
	160	struct pnfs_layout_hdr *tmp;
	161	LIST_HEAD(recall_list);
	162	LIST_HEAD(free_me_list);
	163	struct pnfs_layout_range range = {
	164	.iomode = IOMODE_ANY,
	165	.offset = 0,
	166	.length = NFS4_MAX_UINT64,
	167	};
	168
	169	spin_lock(&clp->cl_lock);
	170	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
	171	if ((args->cbl_recall_type == RETURN_FSID) &&
	172	memcmp(&NFS_SERVER(lo->plh_inode)->fsid,
	173	&args->cbl_fsid, sizeof(struct nfs_fsid)))
	174	continue;
	175	if (!igrab(lo->plh_inode))
	176	continue;
	177	get_layout_hdr(lo);
	178	BUG_ON(!list_empty(&lo->plh_bulk_recall));
	179	list_add(&lo->plh_bulk_recall, &recall_list);
	180	}
	181	spin_unlock(&clp->cl_lock);
	182	list_for_each_entry_safe(lo, tmp,
	183	&recall_list, plh_bulk_recall) {
	184	ino = lo->plh_inode;
	185	spin_lock(&ino->i_lock);
	186	set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
778b5502	187	if (mark_matching_lsegs_invalid(lo, &free_me_list, &range))
43f1b3da FI	188	rv = NFS4ERR_DELAY;
	189	list_del_init(&lo->plh_bulk_recall);
	190	spin_unlock(&ino->i_lock);
f49f9baa	191	pnfs_free_lseg_list(&free_me_list);
43f1b3da FI	192	put_layout_hdr(lo);
	193	iput(ino);
	194	}
43f1b3da FI	195	return rv;
	196	}
	197
	198	static u32 do_callback_layoutrecall(struct nfs_client *clp,
	199	struct cb_layoutrecallargs *args)
	200	{
	201	u32 res = NFS4ERR_DELAY;
	202
	203	dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
	204	if (test_and_set_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state))
	205	goto out;
	206	if (args->cbl_recall_type == RETURN_FILE)
	207	res = initiate_file_draining(clp, args);
	208	else
	209	res = initiate_bulk_draining(clp, args);
	210	clear_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state);
	211	out:
	212	dprintk("%s returning %i\n", __func__, res);
	213	return res;
	214
	215	}
	216
f2a62561 FI	217	__be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
	218	void dummy, struct cb_process_state cps)
	219	{
43f1b3da FI	220	u32 res;
	221
	222	dprintk("%s: -->\n", __func__);
	223
	224	if (cps->clp)
	225	res = do_callback_layoutrecall(cps->clp, args);
	226	else
	227	res = NFS4ERR_OP_NOT_IN_SESSION;
	228
	229	dprintk("%s: exit with status = %d\n", __func__, res);
	230	return cpu_to_be32(res);
f2a62561 FI	231	}
f2a62561 FI	232
36840370 AB	233	static void pnfs_recall_all_layouts(struct nfs_client *clp)
	234	{
	235	struct cb_layoutrecallargs args;
	236
	237	/* Pretend we got a CB_LAYOUTRECALL(ALL) */
	238	memset(&args, 0, sizeof(args));
	239	args.cbl_recall_type = RETURN_ALL;
	240	/* FIXME we ignore errors, what should we do? */
	241	do_callback_layoutrecall(clp, &args);
	242	}
	243
1be5683b ME	244	__be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
	245	void dummy, struct cb_process_state cps)
	246	{
	247	int i;
	248	__be32 res = 0;
	249	struct nfs_client *clp = cps->clp;
	250	struct nfs_server *server = NULL;
	251
	252	dprintk("%s: -->\n", __func__);
	253
	254	if (!clp) {
	255	res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
	256	goto out;
	257	}
	258
	259	for (i = 0; i < args->ndevs; i++) {
	260	struct cb_devicenotifyitem *dev = &args->devs[i];
	261
	262	if (!server \|\|
	263	server->pnfs_curr_ld->id != dev->cbd_layout_type) {
	264	rcu_read_lock();
	265	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
	266	if (server->pnfs_curr_ld &&
	267	server->pnfs_curr_ld->id == dev->cbd_layout_type) {
	268	rcu_read_unlock();
	269	goto found;
	270	}
	271	rcu_read_unlock();
	272	dprintk("%s: layout type %u not found\n",
	273	__func__, dev->cbd_layout_type);
	274	continue;
	275	}
	276
	277	found:
	278	if (dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE)
	279	dprintk("%s: NOTIFY_DEVICEID4_CHANGE not supported, "
	280	"deleting instead\n", __func__);
35c8bb54	281	nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
1be5683b ME	282	}
	283
	284	out:
	285	kfree(args->devs);
	286	dprintk("%s: exit with status = %u\n",
	287	__func__, be32_to_cpu(res));
	288	return res;
	289	}
	290
2597641d AB	291	int nfs41_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	292	{
	293	if (delegation == NULL)
	294	return 0;
	295
94499252	296	if (stateid->stateid.seqid != 0)
2597641d	297	return 0;
94499252 AB	298	if (memcmp(&delegation->stateid.stateid.other,
	299	&stateid->stateid.other,
	300	NFS4_STATEID_OTHER_SIZE))
2597641d AB	301	return 0;
	302
	303	return 1;
	304	}
	305
68f3f901 RL	306	/*
	307	* Validate the sequenceID sent by the server.
	308	* Return success if the sequenceID is one more than what we last saw on
	309	* this slot, accounting for wraparound. Increments the slot's sequence.
	310	*
4911096f AA	311	* We don't yet implement a duplicate request cache, instead we set the
4911096f AA	312	* back channel ca_maxresponsesize_cached to zero. This is OK for now
68f3f901 RL	313	* since we only currently implement idempotent callbacks anyway.
	314	*
	315	* We have a single slot backchannel at this time, so we don't bother
	316	* checking the used_slots bit array on the table. The lower layer guarantees
	317	* a single outstanding callback request at a time.
	318	*/
9733f0d9	319	static __be32
b2f28bd7	320	validate_seqid(struct nfs4_slot_table tbl, struct cb_sequenceargs args)
68f3f901 RL	321	{
	322	struct nfs4_slot *slot;
	323
	324	dprintk("%s enter. slotid %d seqid %d\n",
b2f28bd7	325	__func__, args->csa_slotid, args->csa_sequenceid);
68f3f901	326
b2f28bd7	327	if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
68f3f901 RL	328	return htonl(NFS4ERR_BADSLOT);
68f3f901 RL	329
b2f28bd7	330	slot = tbl->slots + args->csa_slotid;
68f3f901 RL	331	dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
	332
	333	/* Normal */
b2f28bd7	334	if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
68f3f901 RL	335	slot->seq_nr++;
	336	return htonl(NFS4_OK);
	337	}
	338
	339	/* Replay */
b2f28bd7	340	if (args->csa_sequenceid == slot->seq_nr) {
4911096f	341	dprintk("%s seqid %d is a replay\n",
b2f28bd7	342	__func__, args->csa_sequenceid);
4911096f AA	343	/* Signal process_op to set this error on next op */
	344	if (args->csa_cachethis == 0)
	345	return htonl(NFS4ERR_RETRY_UNCACHED_REP);
	346
	347	/* The ca_maxresponsesize_cached is 0 with no DRC */
	348	else if (args->csa_cachethis == 1)
	349	return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
68f3f901 RL	350	}
	351
	352	/* Wraparound */
b2f28bd7	353	if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
68f3f901 RL	354	slot->seq_nr = 1;
	355	return htonl(NFS4_OK);
	356	}
	357
	358	/* Misordered request */
	359	return htonl(NFS4ERR_SEQ_MISORDERED);
	360	}
	361
a7989c3e MS	362	/*
	363	* For each referring call triple, check the session's slot table for
	364	* a match. If the slot is in use and the sequence numbers match, the
	365	* client is still waiting for a response to the original request.
	366	*/
	367	static bool referring_call_exists(struct nfs_client *clp,
	368	uint32_t nrclists,
	369	struct referring_call_list *rclists)
	370	{
	371	bool status = 0;
	372	int i, j;
	373	struct nfs4_session *session;
	374	struct nfs4_slot_table *tbl;
	375	struct referring_call_list *rclist;
	376	struct referring_call *ref;
	377
	378	/*
	379	* XXX When client trunking is implemented, this becomes
	380	* a session lookup from within the loop
	381	*/
	382	session = clp->cl_session;
	383	tbl = &session->fc_slot_table;
	384
	385	for (i = 0; i < nrclists; i++) {
	386	rclist = &rclists[i];
	387	if (memcmp(session->sess_id.data,
	388	rclist->rcl_sessionid.data,
	389	NFS4_MAX_SESSIONID_LEN) != 0)
	390	continue;
	391
	392	for (j = 0; j < rclist->rcl_nrefcalls; j++) {
	393	ref = &rclist->rcl_refcalls[j];
	394
	395	dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
	396	"slotid %u\n", __func__,
	397	((u32 *)&rclist->rcl_sessionid.data)[0],
	398	((u32 *)&rclist->rcl_sessionid.data)[1],
	399	((u32 *)&rclist->rcl_sessionid.data)[2],
	400	((u32 *)&rclist->rcl_sessionid.data)[3],
	401	ref->rc_sequenceid, ref->rc_slotid);
	402
	403	spin_lock(&tbl->slot_tbl_lock);
	404	status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
	405	tbl->slots[ref->rc_slotid].seq_nr ==
	406	ref->rc_sequenceid);
	407	spin_unlock(&tbl->slot_tbl_lock);
	408	if (status)
	409	goto out;
	410	}
	411	}
	412
	413	out:
	414	return status;
	415	}
	416
9733f0d9	417	__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
c36fca52 AA	418	struct cb_sequenceres *res,
c36fca52 AA	419	struct cb_process_state *cps)
d49433e1	420	{
68f3f901	421	struct nfs_client *clp;
9733f0d9	422	int i;
778be232	423	__be32 status = htonl(NFS4ERR_BADSESSION);
d49433e1	424
c36fca52 AA	425	cps->clp = NULL;
c36fca52 AA	426
778be232	427	clp = nfs4_find_client_sessionid(args->csa_addr, &args->csa_sessionid);
68f3f901 RL	428	if (clp == NULL)
	429	goto out;
	430
42acd021 AA	431	/* state manager is resetting the session */
	432	if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) {
	433	status = NFS4ERR_DELAY;
	434	goto out;
	435	}
	436
b2f28bd7	437	status = validate_seqid(&clp->cl_session->bc_slot_table, args);
68f3f901	438	if (status)
c36fca52	439	goto out;
68f3f901	440
72ce2b3c MS	441	/*
	442	* Check for pending referring calls. If a match is found, a
	443	* related callback was received before the response to the original
	444	* call.
	445	*/
	446	if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
	447	status = htonl(NFS4ERR_DELAY);
c36fca52	448	goto out;
72ce2b3c MS	449	}
72ce2b3c MS	450
d49433e1 BH	451	memcpy(&res->csr_sessionid, &args->csa_sessionid,
	452	sizeof(res->csr_sessionid));
	453	res->csr_sequenceid = args->csa_sequenceid;
	454	res->csr_slotid = args->csa_slotid;
	455	res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	456	res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
42acd021	457	nfs4_cb_take_slot(clp);
d49433e1	458
68f3f901	459	out:
2c4cdf8f	460	cps->clp = clp; /* put in nfs4_callback_compound */
72ce2b3c MS	461	for (i = 0; i < args->csa_nrclists; i++)
	462	kfree(args->csa_rclists[i].rcl_refcalls);
	463	kfree(args->csa_rclists);
	464
c36fca52 AA	465	if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
	466	cps->drc_status = status;
	467	status = 0;
	468	} else
4911096f	469	res->csr_status = status;
c36fca52	470
4911096f AA	471	dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
	472	ntohl(status), ntohl(res->csr_status));
	473	return status;
d49433e1 BH	474	}
d49433e1 BH	475
36840370 AB	476	static bool
	477	validate_bitmap_values(unsigned long mask)
	478	{
	479	return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
	480	}
	481
c36fca52 AA	482	__be32 nfs4_callback_recallany(struct cb_recallanyargs args, void dummy,
c36fca52 AA	483	struct cb_process_state *cps)
31f09607	484	{
9733f0d9	485	__be32 status;
31f09607 AB	486	fmode_t flags = 0;
31f09607 AB	487
36840370	488	status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
c36fca52	489	if (!cps->clp) /* set in cb_sequence */
31f09607 AB	490	goto out;
	491
	492	dprintk("NFS: RECALL_ANY callback request from %s\n",
c36fca52	493	rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
31f09607	494
36840370 AB	495	status = cpu_to_be32(NFS4ERR_INVAL);
	496	if (!validate_bitmap_values(args->craa_type_mask))
	497	goto out;
	498
	499	status = cpu_to_be32(NFS4_OK);
31f09607 AB	500	if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
	501	&args->craa_type_mask))
	502	flags = FMODE_READ;
	503	if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
	504	&args->craa_type_mask))
	505	flags \|= FMODE_WRITE;
36840370 AB	506	if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
	507	&args->craa_type_mask))
	508	pnfs_recall_all_layouts(cps->clp);
31f09607	509	if (flags)
c36fca52	510	nfs_expire_all_delegation_types(cps->clp, flags);
31f09607 AB	511	out:
	512	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	513	return status;
	514	}
b9efa1b2 AA	515
b9efa1b2 AA	516	/* Reduce the fore channel's max_slots to the target value */
c36fca52 AA	517	__be32 nfs4_callback_recallslot(struct cb_recallslotargs args, void dummy,
c36fca52 AA	518	struct cb_process_state *cps)
b9efa1b2	519	{
b9efa1b2	520	struct nfs4_slot_table *fc_tbl;
9733f0d9	521	__be32 status;
b9efa1b2 AA	522
b9efa1b2 AA	523	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
c36fca52	524	if (!cps->clp) /* set in cb_sequence */
b9efa1b2 AA	525	goto out;
	526
	527	dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
c36fca52	528	rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
b9efa1b2 AA	529	args->crsa_target_max_slots);
b9efa1b2 AA	530
c36fca52	531	fc_tbl = &cps->clp->cl_session->fc_slot_table;
b9efa1b2 AA	532
b9efa1b2 AA	533	status = htonl(NFS4ERR_BAD_HIGH_SLOT);
bae0ac0e	534	if (args->crsa_target_max_slots > fc_tbl->max_slots \|\|
b9efa1b2	535	args->crsa_target_max_slots < 1)
c36fca52	536	goto out;
bae0ac0e AA	537
	538	status = htonl(NFS4_OK);
	539	if (args->crsa_target_max_slots == fc_tbl->max_slots)
c36fca52	540	goto out;
b9efa1b2 AA	541
b9efa1b2 AA	542	fc_tbl->target_max_slots = args->crsa_target_max_slots;
c36fca52	543	nfs41_handle_recall_slot(cps->clp);
b9efa1b2 AA	544	out:
	545	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	546	return status;
	547	}
d49433e1	548	#endif /* CONFIG_NFS_V4_1 */