Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 5904 insertions, 0 deletions

diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
new file mode 100644
index 000000000..5a157000b
--- /dev/null
+++ b/fs/smb/client/smb2ops.c
@@ -0,0 +1,5904 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  SMB2 version specific operations
+ *
+ *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
+ */
+
+#include <linux/pagemap.h>
+#include <linux/vfs.h>
+#include <linux/falloc.h>
+#include <linux/scatterlist.h>
+#include <linux/uuid.h>
+#include <linux/sort.h>
+#include <crypto/aead.h>
+#include <linux/fiemap.h>
+#include <uapi/linux/magic.h>
+#include "cifsfs.h"
+#include "cifsglob.h"
+#include "smb2pdu.h"
+#include "smb2proto.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "cifs_unicode.h"
+#include "smb2status.h"
+#include "smb2glob.h"
+#include "cifs_ioctl.h"
+#include "smbdirect.h"
+#include "fscache.h"
+#include "fs_context.h"
+#include "cached_dir.h"
+
+/* Change credits for different ops and return the total number of credits */
+static int
+change_conf(struct TCP_Server_Info *server)
+{
+	server->credits += server->echo_credits + server->oplock_credits;
+	if (server->credits > server->max_credits)
+		server->credits = server->max_credits;
+	server->oplock_credits = server->echo_credits = 0;
+	switch (server->credits) {
+	case 0:
+		return 0;
+	case 1:
+		server->echoes = false;
+		server->oplocks = false;
+		break;
+	case 2:
+		server->echoes = true;
+		server->oplocks = false;
+		server->echo_credits = 1;
+		break;
+	default:
+		server->echoes = true;
+		if (enable_oplocks) {
+			server->oplocks = true;
+			server->oplock_credits = 1;
+		} else
+			server->oplocks = false;
+
+		server->echo_credits = 1;
+	}
+	server->credits -= server->echo_credits + server->oplock_credits;
+	return server->credits + server->echo_credits + server->oplock_credits;
+}
+
+static void
+smb2_add_credits(struct TCP_Server_Info *server,
+		 const struct cifs_credits *credits, const int optype)
+{
+	int *val, rc = -1;
+	int scredits, in_flight;
+	unsigned int add = credits->value;
+	unsigned int instance = credits->instance;
+	bool reconnect_detected = false;
+	bool reconnect_with_invalid_credits = false;
+
+	spin_lock(&server->req_lock);
+	val = server->ops->get_credits_field(server, optype);
+
+	/* eg found case where write overlapping reconnect messed up credits */
+	if (((optype & CIFS_OP_MASK) == CIFS_NEG_OP) && (*val != 0))
+		reconnect_with_invalid_credits = true;
+
+	if ((instance == 0) || (instance == server->reconnect_instance))
+		*val += add;
+	else
+		reconnect_detected = true;
+
+	if (*val > 65000) {
+		*val = 65000; /* Don't get near 64K credits, avoid srv bugs */
+		pr_warn_once("server overflowed SMB3 credits\n");
+		trace_smb3_overflow_credits(server->CurrentMid,
+					    server->conn_id, server->hostname, *val,
+					    add, server->in_flight);
+	}
+	server->in_flight--;
+	if (server->in_flight == 0 &&
+	   ((optype & CIFS_OP_MASK) != CIFS_NEG_OP) &&
+	   ((optype & CIFS_OP_MASK) != CIFS_SESS_OP))
+		rc = change_conf(server);
+	/*
+	 * Sometimes server returns 0 credits on oplock break ack - we need to
+	 * rebalance credits in this case.
+	 */
+	else if (server->in_flight > 0 && server->oplock_credits == 0 &&
+		 server->oplocks) {
+		if (server->credits > 1) {
+			server->credits--;
+			server->oplock_credits++;
+		}
+	}
+	scredits = *val;
+	in_flight = server->in_flight;
+	spin_unlock(&server->req_lock);
+	wake_up(&server->request_q);
+
+	if (reconnect_detected) {
+		trace_smb3_reconnect_detected(server->CurrentMid,
+			server->conn_id, server->hostname, scredits, add, in_flight);
+
+		cifs_dbg(FYI, "trying to put %d credits from the old server instance %d\n",
+			 add, instance);
+	}
+
+	if (reconnect_with_invalid_credits) {
+		trace_smb3_reconnect_with_invalid_credits(server->CurrentMid,
+			server->conn_id, server->hostname, scredits, add, in_flight);
+		cifs_dbg(FYI, "Negotiate operation when server credits is non-zero. Optype: %d, server credits: %d, credits added: %d\n",
+			 optype, scredits, add);
+	}
+
+	spin_lock(&server->srv_lock);
+	if (server->tcpStatus == CifsNeedReconnect
+	    || server->tcpStatus == CifsExiting) {
+		spin_unlock(&server->srv_lock);
+		return;
+	}
+	spin_unlock(&server->srv_lock);
+
+	switch (rc) {
+	case -1:
+		/* change_conf hasn't been executed */
+		break;
+	case 0:
+		cifs_server_dbg(VFS, "Possible client or server bug - zero credits\n");
+		break;
+	case 1:
+		cifs_server_dbg(VFS, "disabling echoes and oplocks\n");
+		break;
+	case 2:
+		cifs_dbg(FYI, "disabling oplocks\n");
+		break;
+	default:
+		/* change_conf rebalanced credits for different types */
+		break;
+	}
+
+	trace_smb3_add_credits(server->CurrentMid,
+			server->conn_id, server->hostname, scredits, add, in_flight);
+	cifs_dbg(FYI, "%s: added %u credits total=%d\n", __func__, add, scredits);
+}
+
+static void
+smb2_set_credits(struct TCP_Server_Info *server, const int val)
+{
+	int scredits, in_flight;
+
+	spin_lock(&server->req_lock);
+	server->credits = val;
+	if (val == 1) {
+		server->reconnect_instance++;
+		/*
+		 * ChannelSequence updated for all channels in primary channel so that consistent
+		 * across SMB3 requests sent on any channel. See MS-SMB2 3.2.4.1 and 3.2.7.1
+		 */
+		if (CIFS_SERVER_IS_CHAN(server))
+			server->primary_server->channel_sequence_num++;
+		else
+			server->channel_sequence_num++;
+	}
+	scredits = server->credits;
+	in_flight = server->in_flight;
+	spin_unlock(&server->req_lock);
+
+	trace_smb3_set_credits(server->CurrentMid,
+			server->conn_id, server->hostname, scredits, val, in_flight);
+	cifs_dbg(FYI, "%s: set %u credits\n", __func__, val);
+
+	/* don't log while holding the lock */
+	if (val == 1)
+		cifs_dbg(FYI, "set credits to 1 due to smb2 reconnect\n");
+}
+
+static int *
+smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
+{
+	switch (optype) {
+	case CIFS_ECHO_OP:
+		return &server->echo_credits;
+	case CIFS_OBREAK_OP:
+		return &server->oplock_credits;
+	default:
+		return &server->credits;
+	}
+}
+
+static unsigned int
+smb2_get_credits(struct mid_q_entry *mid)
+{
+	return mid->credits_received;
+}
+
+static int
+smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
+		      unsigned int *num, struct cifs_credits *credits)
+{
+	int rc = 0;
+	unsigned int scredits, in_flight;
+
+	spin_lock(&server->req_lock);
+	while (1) {
+		spin_unlock(&server->req_lock);
+
+		spin_lock(&server->srv_lock);
+		if (server->tcpStatus == CifsExiting) {
+			spin_unlock(&server->srv_lock);
+			return -ENOENT;
+		}
+		spin_unlock(&server->srv_lock);
+
+		spin_lock(&server->req_lock);
+		if (server->credits <= 0) {
+			spin_unlock(&server->req_lock);
+			cifs_num_waiters_inc(server);
+			rc = wait_event_killable(server->request_q,
+				has_credits(server, &server->credits, 1));
+			cifs_num_waiters_dec(server);
+			if (rc)
+				return rc;
+			spin_lock(&server->req_lock);
+		} else {
+			scredits = server->credits;
+			/* can deadlock with reopen */
+			if (scredits <= 8) {
+				*num = SMB2_MAX_BUFFER_SIZE;
+				credits->value = 0;
+				credits->instance = 0;
+				break;
+			}
+
+			/* leave some credits for reopen and other ops */
+			scredits -= 8;
+			*num = min_t(unsigned int, size,
+				     scredits * SMB2_MAX_BUFFER_SIZE);
+
+			credits->value =
+				DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
+			credits->instance = server->reconnect_instance;
+			server->credits -= credits->value;
+			server->in_flight++;
+			if (server->in_flight > server->max_in_flight)
+				server->max_in_flight = server->in_flight;
+			break;
+		}
+	}
+	scredits = server->credits;
+	in_flight = server->in_flight;
+	spin_unlock(&server->req_lock);
+
+	trace_smb3_wait_credits(server->CurrentMid,
+			server->conn_id, server->hostname, scredits, -(credits->value), in_flight);
+	cifs_dbg(FYI, "%s: removed %u credits total=%d\n",
+			__func__, credits->value, scredits);
+
+	return rc;
+}
+
+static int
+smb2_adjust_credits(struct TCP_Server_Info *server,
+		    struct cifs_credits *credits,
+		    const unsigned int payload_size)
+{
+	int new_val = DIV_ROUND_UP(payload_size, SMB2_MAX_BUFFER_SIZE);
+	int scredits, in_flight;
+
+	if (!credits->value || credits->value == new_val)
+		return 0;
+
+	if (credits->value < new_val) {
+		trace_smb3_too_many_credits(server->CurrentMid,
+				server->conn_id, server->hostname, 0, credits->value - new_val, 0);
+		cifs_server_dbg(VFS, "request has less credits (%d) than required (%d)",
+				credits->value, new_val);
+
+		return -EOPNOTSUPP;
+	}
+
+	spin_lock(&server->req_lock);
+
+	if (server->reconnect_instance != credits->instance) {
+		scredits = server->credits;
+		in_flight = server->in_flight;
+		spin_unlock(&server->req_lock);
+
+		trace_smb3_reconnect_detected(server->CurrentMid,
+			server->conn_id, server->hostname, scredits,
+			credits->value - new_val, in_flight);
+		cifs_server_dbg(VFS, "trying to return %d credits to old session\n",
+			 credits->value - new_val);
+		return -EAGAIN;
+	}
+
+	server->credits += credits->value - new_val;
+	scredits = server->credits;
+	in_flight = server->in_flight;
+	spin_unlock(&server->req_lock);
+	wake_up(&server->request_q);
+
+	trace_smb3_adj_credits(server->CurrentMid,
+			server->conn_id, server->hostname, scredits,
+			credits->value - new_val, in_flight);
+	cifs_dbg(FYI, "%s: adjust added %u credits total=%d\n",
+			__func__, credits->value - new_val, scredits);
+
+	credits->value = new_val;
+
+	return 0;
+}
+
+static __u64
+smb2_get_next_mid(struct TCP_Server_Info *server)
+{
+	__u64 mid;
+	/* for SMB2 we need the current value */
+	spin_lock(&server->mid_lock);
+	mid = server->CurrentMid++;
+	spin_unlock(&server->mid_lock);
+	return mid;
+}
+
+static void
+smb2_revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
+{
+	spin_lock(&server->mid_lock);
+	if (server->CurrentMid >= val)
+		server->CurrentMid -= val;
+	spin_unlock(&server->mid_lock);
+}
+
+static struct mid_q_entry *
+__smb2_find_mid(struct TCP_Server_Info *server, char *buf, bool dequeue)
+{
+	struct mid_q_entry *mid;
+	struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
+	__u64 wire_mid = le64_to_cpu(shdr->MessageId);
+
+	if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
+		cifs_server_dbg(VFS, "Encrypted frame parsing not supported yet\n");
+		return NULL;
+	}
+
+	spin_lock(&server->mid_lock);
+	list_for_each_entry(mid, &server->pending_mid_q, qhead) {
+		if ((mid->mid == wire_mid) &&
+		    (mid->mid_state == MID_REQUEST_SUBMITTED) &&
+		    (mid->command == shdr->Command)) {
+			kref_get(&mid->refcount);
+			if (dequeue) {
+				list_del_init(&mid->qhead);
+				mid->mid_flags |= MID_DELETED;
+			}
+			spin_unlock(&server->mid_lock);
+			return mid;
+		}
+	}
+	spin_unlock(&server->mid_lock);
+	return NULL;
+}
+
+static struct mid_q_entry *
+smb2_find_mid(struct TCP_Server_Info *server, char *buf)
+{
+	return __smb2_find_mid(server, buf, false);
+}
+
+static struct mid_q_entry *
+smb2_find_dequeue_mid(struct TCP_Server_Info *server, char *buf)
+{
+	return __smb2_find_mid(server, buf, true);
+}
+
+static void
+smb2_dump_detail(void *buf, struct TCP_Server_Info *server)
+{
+#ifdef CONFIG_CIFS_DEBUG2
+	struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
+
+	cifs_server_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
+		 shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
+		 shdr->Id.SyncId.ProcessId);
+	if (!server->ops->check_message(buf, server->total_read, server)) {
+		cifs_server_dbg(VFS, "smb buf %p len %u\n", buf,
+				server->ops->calc_smb_size(buf));
+	}
+#endif
+}
+
+static bool
+smb2_need_neg(struct TCP_Server_Info *server)
+{
+	return server->max_read == 0;
+}
+
+static int
+smb2_negotiate(const unsigned int xid,
+	       struct cifs_ses *ses,
+	       struct TCP_Server_Info *server)
+{
+	int rc;
+
+	spin_lock(&server->mid_lock);
+	server->CurrentMid = 0;
+	spin_unlock(&server->mid_lock);
+	rc = SMB2_negotiate(xid, ses, server);
+	/* BB we probably don't need to retry with modern servers */
+	if (rc == -EAGAIN)
+		rc = -EHOSTDOWN;
+	return rc;
+}
+
+static unsigned int
+smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
+{
+	struct TCP_Server_Info *server = tcon->ses->server;
+	unsigned int wsize;
+
+	/* start with specified wsize, or default */
+	wsize = ctx->wsize ? ctx->wsize : CIFS_DEFAULT_IOSIZE;
+	wsize = min_t(unsigned int, wsize, server->max_write);
+	if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
+		wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
+
+	return wsize;
+}
+
+static unsigned int
+smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
+{
+	struct TCP_Server_Info *server = tcon->ses->server;
+	unsigned int wsize;
+
+	/* start with specified wsize, or default */
+	wsize = ctx->wsize ? ctx->wsize : SMB3_DEFAULT_IOSIZE;
+	wsize = min_t(unsigned int, wsize, server->max_write);
+#ifdef CONFIG_CIFS_SMB_DIRECT
+	if (server->rdma) {
+		if (server->sign)
+			/*
+			 * Account for SMB2 data transfer packet header and
+			 * possible encryption header
+			 */
+			wsize = min_t(unsigned int,
+				wsize,
+				server->smbd_conn->max_fragmented_send_size -
+					SMB2_READWRITE_PDU_HEADER_SIZE -
+					sizeof(struct smb2_transform_hdr));
+		else
+			wsize = min_t(unsigned int,
+				wsize, server->smbd_conn->max_readwrite_size);
+	}
+#endif
+	if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
+		wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
+
+	return wsize;
+}
+
+static unsigned int
+smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
+{
+	struct TCP_Server_Info *server = tcon->ses->server;
+	unsigned int rsize;
+
+	/* start with specified rsize, or default */
+	rsize = ctx->rsize ? ctx->rsize : CIFS_DEFAULT_IOSIZE;
+	rsize = min_t(unsigned int, rsize, server->max_read);
+
+	if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
+		rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
+
+	return rsize;
+}
+
+static unsigned int
+smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
+{
+	struct TCP_Server_Info *server = tcon->ses->server;
+	unsigned int rsize;
+
+	/* start with specified rsize, or default */
+	rsize = ctx->rsize ? ctx->rsize : SMB3_DEFAULT_IOSIZE;
+	rsize = min_t(unsigned int, rsize, server->max_read);
+#ifdef CONFIG_CIFS_SMB_DIRECT
+	if (server->rdma) {
+		if (server->sign)
+			/*
+			 * Account for SMB2 data transfer packet header and
+			 * possible encryption header
+			 */
+			rsize = min_t(unsigned int,
+				rsize,
+				server->smbd_conn->max_fragmented_recv_size -
+					SMB2_READWRITE_PDU_HEADER_SIZE -
+					sizeof(struct smb2_transform_hdr));
+		else
+			rsize = min_t(unsigned int,
+				rsize, server->smbd_conn->max_readwrite_size);
+	}
+#endif
+
+	if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
+		rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
+
+	return rsize;
+}
+
+/*
+ * compare two interfaces a and b
+ * return 0 if everything matches.
+ * return 1 if a is rdma capable, or rss capable, or has higher link speed
+ * return -1 otherwise.
+ */
+static int
+iface_cmp(struct cifs_server_iface *a, struct cifs_server_iface *b)
+{
+	int cmp_ret = 0;
+
+	WARN_ON(!a || !b);
+	if (a->rdma_capable == b->rdma_capable) {
+		if (a->rss_capable == b->rss_capable) {
+			if (a->speed == b->speed) {
+				cmp_ret = cifs_ipaddr_cmp((struct sockaddr *) &a->sockaddr,
+							  (struct sockaddr *) &b->sockaddr);
+				if (!cmp_ret)
+					return 0;
+				else if (cmp_ret > 0)
+					return 1;
+				else
+					return -1;
+			} else if (a->speed > b->speed)
+				return 1;
+			else
+				return -1;
+		} else if (a->rss_capable > b->rss_capable)
+			return 1;
+		else
+			return -1;
+	} else if (a->rdma_capable > b->rdma_capable)
+		return 1;
+	else
+		return -1;
+}
+
+static int
+parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
+			size_t buf_len, struct cifs_ses *ses, bool in_mount)
+{
+	struct network_interface_info_ioctl_rsp *p;
+	struct sockaddr_in *addr4;
+	struct sockaddr_in6 *addr6;
+	struct iface_info_ipv4 *p4;
+	struct iface_info_ipv6 *p6;
+	struct cifs_server_iface *info = NULL, *iface = NULL, *niface = NULL;
+	struct cifs_server_iface tmp_iface;
+	ssize_t bytes_left;
+	size_t next = 0;
+	int nb_iface = 0;
+	int rc = 0, ret = 0;
+
+	bytes_left = buf_len;
+	p = buf;
+
+	spin_lock(&ses->iface_lock);
+	/* do not query too frequently, this time with lock held */
+	if (ses->iface_last_update &&
+	    time_before(jiffies, ses->iface_last_update +
+			(SMB_INTERFACE_POLL_INTERVAL * HZ))) {
+		spin_unlock(&ses->iface_lock);
+		return 0;
+	}
+
+	/*
+	 * Go through iface_list and mark them as inactive
+	 */
+	list_for_each_entry_safe(iface, niface, &ses->iface_list,
+				 iface_head)
+		iface->is_active = 0;
+
+	spin_unlock(&ses->iface_lock);
+
+	/*
+	 * Samba server e.g. can return an empty interface list in some cases,
+	 * which would only be a problem if we were requesting multichannel
+	 */
+	if (bytes_left == 0) {
+		/* avoid spamming logs every 10 minutes, so log only in mount */
+		if ((ses->chan_max > 1) && in_mount)
+			cifs_dbg(VFS,
+				 "multichannel not available\n"
+				 "Empty network interface list returned by server %s\n",
+				 ses->server->hostname);
+		rc = -EINVAL;
+		goto out;
+	}
+
+	while (bytes_left >= sizeof(*p)) {
+		memset(&tmp_iface, 0, sizeof(tmp_iface));
+		tmp_iface.speed = le64_to_cpu(p->LinkSpeed);
+		tmp_iface.rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE) ? 1 : 0;
+		tmp_iface.rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE) ? 1 : 0;
+
+		switch (p->Family) {
+		/*
+		 * The kernel and wire socket structures have the same
+		 * layout and use network byte order but make the
+		 * conversion explicit in case either one changes.
+		 */
+		case INTERNETWORK:
+			addr4 = (struct sockaddr_in *)&tmp_iface.sockaddr;
+			p4 = (struct iface_info_ipv4 *)p->Buffer;
+			addr4->sin_family = AF_INET;
+			memcpy(&addr4->sin_addr, &p4->IPv4Address, 4);
+
+			/* [MS-SMB2] 2.2.32.5.1.1 Clients MUST ignore these */
+			addr4->sin_port = cpu_to_be16(CIFS_PORT);
+
+			cifs_dbg(FYI, "%s: ipv4 %pI4\n", __func__,
+				 &addr4->sin_addr);
+			break;
+		case INTERNETWORKV6:
+			addr6 =	(struct sockaddr_in6 *)&tmp_iface.sockaddr;
+			p6 = (struct iface_info_ipv6 *)p->Buffer;
+			addr6->sin6_family = AF_INET6;
+			memcpy(&addr6->sin6_addr, &p6->IPv6Address, 16);
+
+			/* [MS-SMB2] 2.2.32.5.1.2 Clients MUST ignore these */
+			addr6->sin6_flowinfo = 0;
+			addr6->sin6_scope_id = 0;
+			addr6->sin6_port = cpu_to_be16(CIFS_PORT);
+
+			cifs_dbg(FYI, "%s: ipv6 %pI6\n", __func__,
+				 &addr6->sin6_addr);
+			break;
+		default:
+			cifs_dbg(VFS,
+				 "%s: skipping unsupported socket family\n",
+				 __func__);
+			goto next_iface;
+		}
+
+		/*
+		 * The iface_list is assumed to be sorted by speed.
+		 * Check if the new interface exists in that list.
+		 * NEVER change iface. it could be in use.
+		 * Add a new one instead
+		 */
+		spin_lock(&ses->iface_lock);
+		iface = niface = NULL;
+		list_for_each_entry_safe(iface, niface, &ses->iface_list,
+					 iface_head) {
+			ret = iface_cmp(iface, &tmp_iface);
+			if (!ret) {
+				iface->is_active = 1;
+				spin_unlock(&ses->iface_lock);
+				goto next_iface;
+			} else if (ret < 0) {
+				/* all remaining ifaces are slower */
+				kref_get(&iface->refcount);
+				break;
+			}
+		}
+		spin_unlock(&ses->iface_lock);
+
+		/* no match. insert the entry in the list */
+		info = kmalloc(sizeof(struct cifs_server_iface),
+			       GFP_KERNEL);
+		if (!info) {
+			rc = -ENOMEM;
+			goto out;
+		}
+		memcpy(info, &tmp_iface, sizeof(tmp_iface));
+
+		/* add this new entry to the list */
+		kref_init(&info->refcount);
+		info->is_active = 1;
+
+		cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, ses->iface_count);
+		cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
+		cifs_dbg(FYI, "%s: capabilities 0x%08x\n", __func__,
+			 le32_to_cpu(p->Capability));
+
+		spin_lock(&ses->iface_lock);
+		if (!list_entry_is_head(iface, &ses->iface_list, iface_head)) {
+			list_add_tail(&info->iface_head, &iface->iface_head);
+			kref_put(&iface->refcount, release_iface);
+		} else
+			list_add_tail(&info->iface_head, &ses->iface_list);
+
+		ses->iface_count++;
+		spin_unlock(&ses->iface_lock);
+		ses->iface_last_update = jiffies;
+next_iface:
+		nb_iface++;
+		next = le32_to_cpu(p->Next);
+		if (!next) {
+			bytes_left -= sizeof(*p);
+			break;
+		}
+		p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
+		bytes_left -= next;
+	}
+
+	if (!nb_iface) {
+		cifs_dbg(VFS, "%s: malformed interface info\n", __func__);
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/* Azure rounds the buffer size up 8, to a 16 byte boundary */
+	if ((bytes_left > 8) || p->Next)
+		cifs_dbg(VFS, "%s: incomplete interface info\n", __func__);
+
+
+	if (!ses->iface_count) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+out:
+	/*
+	 * Go through the list again and put the inactive entries
+	 */
+	spin_lock(&ses->iface_lock);
+	list_for_each_entry_safe(iface, niface, &ses->iface_list,
+				 iface_head) {
+		if (!iface->is_active) {
+			list_del(&iface->iface_head);
+			kref_put(&iface->refcount, release_iface);
+			ses->iface_count--;
+		}
+	}
+	spin_unlock(&ses->iface_lock);
+
+	return rc;
+}
+
+int
+SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon, bool in_mount)
+{
+	int rc;
+	unsigned int ret_data_len = 0;
+	struct network_interface_info_ioctl_rsp *out_buf = NULL;
+	struct cifs_ses *ses = tcon->ses;
+	struct TCP_Server_Info *pserver;
+
+	/* do not query too frequently */
+	if (ses->iface_last_update &&
+	    time_before(jiffies, ses->iface_last_update +
+			(SMB_INTERFACE_POLL_INTERVAL * HZ)))
+		return 0;
+
+	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
+			FSCTL_QUERY_NETWORK_INTERFACE_INFO,
+			NULL /* no data input */, 0 /* no data input */,
+			CIFSMaxBufSize, (char **)&out_buf, &ret_data_len);
+	if (rc == -EOPNOTSUPP) {
+		cifs_dbg(FYI,
+			 "server does not support query network interfaces\n");
+		ret_data_len = 0;
+	} else if (rc != 0) {
+		cifs_tcon_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
+		goto out;
+	}
+
+	rc = parse_server_interfaces(out_buf, ret_data_len, ses, in_mount);
+	if (rc)
+		goto out;
+
+	/* check if iface is still active */
+	spin_lock(&ses->chan_lock);
+	pserver = ses->chans[0].server;
+	if (pserver && !cifs_chan_is_iface_active(ses, pserver)) {
+		spin_unlock(&ses->chan_lock);
+		cifs_chan_update_iface(ses, pserver);
+		spin_lock(&ses->chan_lock);
+	}
+	spin_unlock(&ses->chan_lock);
+
+out:
+	kfree(out_buf);
+	return rc;
+}
+
+static void
+smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
+	      struct cifs_sb_info *cifs_sb)
+{
+	int rc;
+	__le16 srch_path = 0; /* Null - open root of share */
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+	struct cached_fid *cfid = NULL;
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = "",
+		.desired_access = FILE_READ_ATTRIBUTES,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, 0),
+		.fid = &fid,
+	};
+
+	rc = open_cached_dir(xid, tcon, "", cifs_sb, false, &cfid);
+	if (rc == 0)
+		memcpy(&fid, &cfid->fid, sizeof(struct cifs_fid));
+	else
+		rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
+			       NULL, NULL);
+	if (rc)
+		return;
+
+	SMB3_request_interfaces(xid, tcon, true /* called during  mount */);
+
+	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+			FS_ATTRIBUTE_INFORMATION);
+	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+			FS_DEVICE_INFORMATION);
+	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+			FS_VOLUME_INFORMATION);
+	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+			FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
+	if (cfid == NULL)
+		SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+	else
+		close_cached_dir(cfid);
+}
+
+static void
+smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
+	      struct cifs_sb_info *cifs_sb)
+{
+	int rc;
+	__le16 srch_path = 0; /* Null - open root of share */
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = "",
+		.desired_access = FILE_READ_ATTRIBUTES,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, 0),
+		.fid = &fid,
+	};
+
+	rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
+		       NULL, NULL);
+	if (rc)
+		return;
+
+	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+			FS_ATTRIBUTE_INFORMATION);
+	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+			FS_DEVICE_INFORMATION);
+	SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+}
+
+static int
+smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
+			struct cifs_sb_info *cifs_sb, const char *full_path)
+{
+	__le16 *utf16_path;
+	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	int err_buftype = CIFS_NO_BUFFER;
+	struct cifs_open_parms oparms;
+	struct kvec err_iov = {};
+	struct cifs_fid fid;
+	struct cached_fid *cfid;
+	bool islink;
+	int rc, rc2;
+
+	rc = open_cached_dir(xid, tcon, full_path, cifs_sb, true, &cfid);
+	if (!rc) {
+		if (cfid->has_lease) {
+			close_cached_dir(cfid);
+			return 0;
+		}
+		close_cached_dir(cfid);
+	}
+
+	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
+	if (!utf16_path)
+		return -ENOMEM;
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = full_path,
+		.desired_access = FILE_READ_ATTRIBUTES,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, 0),
+		.fid = &fid,
+	};
+
+	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
+		       &err_iov, &err_buftype);
+	if (rc) {
+		struct smb2_hdr *hdr = err_iov.iov_base;
+
+		if (unlikely(!hdr || err_buftype == CIFS_NO_BUFFER))
+			goto out;
+
+		if (rc != -EREMOTE && hdr->Status == STATUS_OBJECT_NAME_INVALID) {
+			rc2 = cifs_inval_name_dfs_link_error(xid, tcon, cifs_sb,
+							     full_path, &islink);
+			if (rc2) {
+				rc = rc2;
+				goto out;
+			}
+			if (islink)
+				rc = -EREMOTE;
+		}
+		if (rc == -EREMOTE && IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) && cifs_sb &&
+		    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS))
+			rc = -EOPNOTSUPP;
+		goto out;
+	}
+
+	rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+
+out:
+	free_rsp_buf(err_buftype, err_iov.iov_base);
+	kfree(utf16_path);
+	return rc;
+}
+
+static int smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
+			     struct cifs_sb_info *cifs_sb, const char *full_path,
+			     u64 *uniqueid, struct cifs_open_info_data *data)
+{
+	*uniqueid = le64_to_cpu(data->fi.IndexNumber);
+	return 0;
+}
+
+static int smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
+				struct cifsFileInfo *cfile, struct cifs_open_info_data *data)
+{
+	struct cifs_fid *fid = &cfile->fid;
+
+	if (cfile->symlink_target) {
+		data->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
+		if (!data->symlink_target)
+			return -ENOMEM;
+	}
+	return SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid, &data->fi);
+}
+
+#ifdef CONFIG_CIFS_XATTR
+static ssize_t
+move_smb2_ea_to_cifs(char *dst, size_t dst_size,
+		     struct smb2_file_full_ea_info *src, size_t src_size,
+		     const unsigned char *ea_name)
+{
+	int rc = 0;
+	unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
+	char *name, *value;
+	size_t buf_size = dst_size;
+	size_t name_len, value_len, user_name_len;
+
+	while (src_size > 0) {
+		name_len = (size_t)src->ea_name_length;
+		value_len = (size_t)le16_to_cpu(src->ea_value_length);
+
+		if (name_len == 0)
+			break;
+
+		if (src_size < 8 + name_len + 1 + value_len) {
+			cifs_dbg(FYI, "EA entry goes beyond length of list\n");
+			rc = -EIO;
+			goto out;
+		}
+
+		name = &src->ea_data[0];
+		value = &src->ea_data[src->ea_name_length + 1];
+
+		if (ea_name) {
+			if (ea_name_len == name_len &&
+			    memcmp(ea_name, name, name_len) == 0) {
+				rc = value_len;
+				if (dst_size == 0)
+					goto out;
+				if (dst_size < value_len) {
+					rc = -ERANGE;
+					goto out;
+				}
+				memcpy(dst, value, value_len);
+				goto out;
+			}
+		} else {
+			/* 'user.' plus a terminating null */
+			user_name_len = 5 + 1 + name_len;
+
+			if (buf_size == 0) {
+				/* skip copy - calc size only */
+				rc += user_name_len;
+			} else if (dst_size >= user_name_len) {
+				dst_size -= user_name_len;
+				memcpy(dst, "user.", 5);
+				dst += 5;
+				memcpy(dst, src->ea_data, name_len);
+				dst += name_len;
+				*dst = 0;
+				++dst;
+				rc += user_name_len;
+			} else {
+				/* stop before overrun buffer */
+				rc = -ERANGE;
+				break;
+			}
+		}
+
+		if (!src->next_entry_offset)
+			break;
+
+		if (src_size < le32_to_cpu(src->next_entry_offset)) {
+			/* stop before overrun buffer */
+			rc = -ERANGE;
+			break;
+		}
+		src_size -= le32_to_cpu(src->next_entry_offset);
+		src = (void *)((char *)src +
+			       le32_to_cpu(src->next_entry_offset));
+	}
+
+	/* didn't find the named attribute */
+	if (ea_name)
+		rc = -ENODATA;
+
+out:
+	return (ssize_t)rc;
+}
+
+static ssize_t
+smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
+	       const unsigned char *path, const unsigned char *ea_name,
+	       char *ea_data, size_t buf_size,
+	       struct cifs_sb_info *cifs_sb)
+{
+	int rc;
+	struct kvec rsp_iov = {NULL, 0};
+	int buftype = CIFS_NO_BUFFER;
+	struct smb2_query_info_rsp *rsp;
+	struct smb2_file_full_ea_info *info = NULL;
+
+	rc = smb2_query_info_compound(xid, tcon, path,
+				      FILE_READ_EA,
+				      FILE_FULL_EA_INFORMATION,
+				      SMB2_O_INFO_FILE,
+				      CIFSMaxBufSize -
+				      MAX_SMB2_CREATE_RESPONSE_SIZE -
+				      MAX_SMB2_CLOSE_RESPONSE_SIZE,
+				      &rsp_iov, &buftype, cifs_sb);
+	if (rc) {
+		/*
+		 * If ea_name is NULL (listxattr) and there are no EAs,
+		 * return 0 as it's not an error. Otherwise, the specified
+		 * ea_name was not found.
+		 */
+		if (!ea_name && rc == -ENODATA)
+			rc = 0;
+		goto qeas_exit;
+	}
+
+	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
+	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
+			       le32_to_cpu(rsp->OutputBufferLength),
+			       &rsp_iov,
+			       sizeof(struct smb2_file_full_ea_info));
+	if (rc)
+		goto qeas_exit;
+
+	info = (struct smb2_file_full_ea_info *)(
+			le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
+	rc = move_smb2_ea_to_cifs(ea_data, buf_size, info,
+			le32_to_cpu(rsp->OutputBufferLength), ea_name);
+
+ qeas_exit:
+	free_rsp_buf(buftype, rsp_iov.iov_base);
+	return rc;
+}
+
+
+static int
+smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
+	    const char *path, const char *ea_name, const void *ea_value,
+	    const __u16 ea_value_len, const struct nls_table *nls_codepage,
+	    struct cifs_sb_info *cifs_sb)
+{
+	struct cifs_ses *ses = tcon->ses;
+	struct TCP_Server_Info *server = cifs_pick_channel(ses);
+	__le16 *utf16_path = NULL;
+	int ea_name_len = strlen(ea_name);
+	int flags = CIFS_CP_CREATE_CLOSE_OP;
+	int len;
+	struct smb_rqst rqst[3];
+	int resp_buftype[3];
+	struct kvec rsp_iov[3];
+	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+	struct cifs_open_parms oparms;
+	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_fid fid;
+	struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
+	unsigned int size[1];
+	void *data[1];
+	struct smb2_file_full_ea_info *ea = NULL;
+	struct kvec close_iov[1];
+	struct smb2_query_info_rsp *rsp;
+	int rc, used_len = 0;
+
+	if (smb3_encryption_required(tcon))
+		flags |= CIFS_TRANSFORM_REQ;
+
+	if (ea_name_len > 255)
+		return -EINVAL;
+
+	utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+	if (!utf16_path)
+		return -ENOMEM;
+
+	memset(rqst, 0, sizeof(rqst));
+	resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
+	memset(rsp_iov, 0, sizeof(rsp_iov));
+
+	if (ses->server->ops->query_all_EAs) {
+		if (!ea_value) {
+			rc = ses->server->ops->query_all_EAs(xid, tcon, path,
+							     ea_name, NULL, 0,
+							     cifs_sb);
+			if (rc == -ENODATA)
+				goto sea_exit;
+		} else {
+			/* If we are adding a attribute we should first check
+			 * if there will be enough space available to store
+			 * the new EA. If not we should not add it since we
+			 * would not be able to even read the EAs back.
+			 */
+			rc = smb2_query_info_compound(xid, tcon, path,
+				      FILE_READ_EA,
+				      FILE_FULL_EA_INFORMATION,
+				      SMB2_O_INFO_FILE,
+				      CIFSMaxBufSize -
+				      MAX_SMB2_CREATE_RESPONSE_SIZE -
+				      MAX_SMB2_CLOSE_RESPONSE_SIZE,
+				      &rsp_iov[1], &resp_buftype[1], cifs_sb);
+			if (rc == 0) {
+				rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
+				used_len = le32_to_cpu(rsp->OutputBufferLength);
+			}
+			free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
+			resp_buftype[1] = CIFS_NO_BUFFER;
+			memset(&rsp_iov[1], 0, sizeof(rsp_iov[1]));
+			rc = 0;
+
+			/* Use a fudge factor of 256 bytes in case we collide
+			 * with a different set_EAs command.
+			 */
+			if (CIFSMaxBufSize - MAX_SMB2_CREATE_RESPONSE_SIZE -
+			   MAX_SMB2_CLOSE_RESPONSE_SIZE - 256 <
+			   used_len + ea_name_len + ea_value_len + 1) {
+				rc = -ENOSPC;
+				goto sea_exit;
+			}
+		}
+	}
+
+	/* Open */
+	memset(&open_iov, 0, sizeof(open_iov));
+	rqst[0].rq_iov = open_iov;
+	rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = path,
+		.desired_access = FILE_WRITE_EA,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, 0),
+		.fid = &fid,
+	};
+
+	rc = SMB2_open_init(tcon, server,
+			    &rqst[0], &oplock, &oparms, utf16_path);
+	if (rc)
+		goto sea_exit;
+	smb2_set_next_command(tcon, &rqst[0]);
+
+
+	/* Set Info */
+	memset(&si_iov, 0, sizeof(si_iov));
+	rqst[1].rq_iov = si_iov;
+	rqst[1].rq_nvec = 1;
+
+	len = sizeof(*ea) + ea_name_len + ea_value_len + 1;
+	ea = kzalloc(len, GFP_KERNEL);
+	if (ea == NULL) {
+		rc = -ENOMEM;
+		goto sea_exit;
+	}
+
+	ea->ea_name_length = ea_name_len;
+	ea->ea_value_length = cpu_to_le16(ea_value_len);
+	memcpy(ea->ea_data, ea_name, ea_name_len + 1);
+	memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
+
+	size[0] = len;
+	data[0] = ea;
+
+	rc = SMB2_set_info_init(tcon, server,
+				&rqst[1], COMPOUND_FID,
+				COMPOUND_FID, current->tgid,
+				FILE_FULL_EA_INFORMATION,
+				SMB2_O_INFO_FILE, 0, data, size);
+	if (rc)
+		goto sea_exit;
+	smb2_set_next_command(tcon, &rqst[1]);
+	smb2_set_related(&rqst[1]);
+
+
+	/* Close */
+	memset(&close_iov, 0, sizeof(close_iov));
+	rqst[2].rq_iov = close_iov;
+	rqst[2].rq_nvec = 1;
+	rc = SMB2_close_init(tcon, server,
+			     &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
+	if (rc)
+		goto sea_exit;
+	smb2_set_related(&rqst[2]);
+
+	rc = compound_send_recv(xid, ses, server,
+				flags, 3, rqst,
+				resp_buftype, rsp_iov);
+	/* no need to bump num_remote_opens because handle immediately closed */
+
+ sea_exit:
+	kfree(ea);
+	kfree(utf16_path);
+	SMB2_open_free(&rqst[0]);
+	SMB2_set_info_free(&rqst[1]);
+	SMB2_close_free(&rqst[2]);
+	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+	free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
+	free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
+	return rc;
+}
+#endif
+
+static bool
+smb2_can_echo(struct TCP_Server_Info *server)
+{
+	return server->echoes;
+}
+
+static void
+smb2_clear_stats(struct cifs_tcon *tcon)
+{
+	int i;
+
+	for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
+		atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
+		atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
+	}
+}
+
+static void
+smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
+{
+	seq_puts(m, "\n\tShare Capabilities:");
+	if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
+		seq_puts(m, " DFS,");
+	if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
+		seq_puts(m, " CONTINUOUS AVAILABILITY,");
+	if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
+		seq_puts(m, " SCALEOUT,");
+	if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
+		seq_puts(m, " CLUSTER,");
+	if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
+		seq_puts(m, " ASYMMETRIC,");
+	if (tcon->capabilities == 0)
+		seq_puts(m, " None");
+	if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
+		seq_puts(m, " Aligned,");
+	if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
+		seq_puts(m, " Partition Aligned,");
+	if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
+		seq_puts(m, " SSD,");
+	if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
+		seq_puts(m, " TRIM-support,");
+
+	seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
+	seq_printf(m, "\n\ttid: 0x%x", tcon->tid);
+	if (tcon->perf_sector_size)
+		seq_printf(m, "\tOptimal sector size: 0x%x",
+			   tcon->perf_sector_size);
+	seq_printf(m, "\tMaximal Access: 0x%x", tcon->maximal_access);
+}
+
+static void
+smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
+{
+	atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
+	atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
+
+	/*
+	 *  Can't display SMB2_NEGOTIATE, SESSION_SETUP, LOGOFF, CANCEL and ECHO
+	 *  totals (requests sent) since those SMBs are per-session not per tcon
+	 */
+	seq_printf(m, "\nBytes read: %llu  Bytes written: %llu",
+		   (long long)(tcon->bytes_read),
+		   (long long)(tcon->bytes_written));
+	seq_printf(m, "\nOpen files: %d total (local), %d open on server",
+		   atomic_read(&tcon->num_local_opens),
+		   atomic_read(&tcon->num_remote_opens));
+	seq_printf(m, "\nTreeConnects: %d total %d failed",
+		   atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
+		   atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
+	seq_printf(m, "\nTreeDisconnects: %d total %d failed",
+		   atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
+		   atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
+	seq_printf(m, "\nCreates: %d total %d failed",
+		   atomic_read(&sent[SMB2_CREATE_HE]),
+		   atomic_read(&failed[SMB2_CREATE_HE]));
+	seq_printf(m, "\nCloses: %d total %d failed",
+		   atomic_read(&sent[SMB2_CLOSE_HE]),
+		   atomic_read(&failed[SMB2_CLOSE_HE]));
+	seq_printf(m, "\nFlushes: %d total %d failed",
+		   atomic_read(&sent[SMB2_FLUSH_HE]),
+		   atomic_read(&failed[SMB2_FLUSH_HE]));
+	seq_printf(m, "\nReads: %d total %d failed",
+		   atomic_read(&sent[SMB2_READ_HE]),
+		   atomic_read(&failed[SMB2_READ_HE]));
+	seq_printf(m, "\nWrites: %d total %d failed",
+		   atomic_read(&sent[SMB2_WRITE_HE]),
+		   atomic_read(&failed[SMB2_WRITE_HE]));
+	seq_printf(m, "\nLocks: %d total %d failed",
+		   atomic_read(&sent[SMB2_LOCK_HE]),
+		   atomic_read(&failed[SMB2_LOCK_HE]));
+	seq_printf(m, "\nIOCTLs: %d total %d failed",
+		   atomic_read(&sent[SMB2_IOCTL_HE]),
+		   atomic_read(&failed[SMB2_IOCTL_HE]));
+	seq_printf(m, "\nQueryDirectories: %d total %d failed",
+		   atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
+		   atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
+	seq_printf(m, "\nChangeNotifies: %d total %d failed",
+		   atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
+		   atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
+	seq_printf(m, "\nQueryInfos: %d total %d failed",
+		   atomic_read(&sent[SMB2_QUERY_INFO_HE]),
+		   atomic_read(&failed[SMB2_QUERY_INFO_HE]));
+	seq_printf(m, "\nSetInfos: %d total %d failed",
+		   atomic_read(&sent[SMB2_SET_INFO_HE]),
+		   atomic_read(&failed[SMB2_SET_INFO_HE]));
+	seq_printf(m, "\nOplockBreaks: %d sent %d failed",
+		   atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
+		   atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
+}
+
+static void
+smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
+{
+	struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
+	struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
+
+	cfile->fid.persistent_fid = fid->persistent_fid;
+	cfile->fid.volatile_fid = fid->volatile_fid;
+	cfile->fid.access = fid->access;
+#ifdef CONFIG_CIFS_DEBUG2
+	cfile->fid.mid = fid->mid;
+#endif /* CIFS_DEBUG2 */
+	server->ops->set_oplock_level(cinode, oplock, fid->epoch,
+				      &fid->purge_cache);
+	cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
+	memcpy(cfile->fid.create_guid, fid->create_guid, 16);
+}
+
+static void
+smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
+		struct cifs_fid *fid)
+{
+	SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
+}
+
+static void
+smb2_close_getattr(const unsigned int xid, struct cifs_tcon *tcon,
+		   struct cifsFileInfo *cfile)
+{
+	struct smb2_file_network_open_info file_inf;
+	struct inode *inode;
+	int rc;
+
+	rc = __SMB2_close(xid, tcon, cfile->fid.persistent_fid,
+		   cfile->fid.volatile_fid, &file_inf);
+	if (rc)
+		return;
+
+	inode = d_inode(cfile->dentry);
+
+	spin_lock(&inode->i_lock);
+	CIFS_I(inode)->time = jiffies;
+
+	/* Creation time should not need to be updated on close */
+	if (file_inf.LastWriteTime)
+		inode->i_mtime = cifs_NTtimeToUnix(file_inf.LastWriteTime);
+	if (file_inf.ChangeTime)
+		inode->i_ctime = cifs_NTtimeToUnix(file_inf.ChangeTime);
+	if (file_inf.LastAccessTime)
+		inode->i_atime = cifs_NTtimeToUnix(file_inf.LastAccessTime);
+
+	/*
+	 * i_blocks is not related to (i_size / i_blksize),
+	 * but instead 512 byte (2**9) size is required for
+	 * calculating num blocks.
+	 */
+	if (le64_to_cpu(file_inf.AllocationSize) > 4096)
+		inode->i_blocks =
+			(512 - 1 + le64_to_cpu(file_inf.AllocationSize)) >> 9;
+
+	/* End of file and Attributes should not have to be updated on close */
+	spin_unlock(&inode->i_lock);
+}
+
+static int
+SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
+		     u64 persistent_fid, u64 volatile_fid,
+		     struct copychunk_ioctl *pcchunk)
+{
+	int rc;
+	unsigned int ret_data_len;
+	struct resume_key_req *res_key;
+
+	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
+			FSCTL_SRV_REQUEST_RESUME_KEY, NULL, 0 /* no input */,
+			CIFSMaxBufSize, (char **)&res_key, &ret_data_len);
+
+	if (rc == -EOPNOTSUPP) {
+		pr_warn_once("Server share %s does not support copy range\n", tcon->tree_name);
+		goto req_res_key_exit;
+	} else if (rc) {
+		cifs_tcon_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
+		goto req_res_key_exit;
+	}
+	if (ret_data_len < sizeof(struct resume_key_req)) {
+		cifs_tcon_dbg(VFS, "Invalid refcopy resume key length\n");
+		rc = -EINVAL;
+		goto req_res_key_exit;
+	}
+	memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
+
+req_res_key_exit:
+	kfree(res_key);
+	return rc;
+}
+
+struct iqi_vars {
+	struct smb_rqst rqst[3];
+	struct kvec rsp_iov[3];
+	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+	struct kvec qi_iov[1];
+	struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
+	struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
+	struct kvec close_iov[1];
+};
+
+static int
+smb2_ioctl_query_info(const unsigned int xid,
+		      struct cifs_tcon *tcon,
+		      struct cifs_sb_info *cifs_sb,
+		      __le16 *path, int is_dir,
+		      unsigned long p)
+{
+	struct iqi_vars *vars;
+	struct smb_rqst *rqst;
+	struct kvec *rsp_iov;
+	struct cifs_ses *ses = tcon->ses;
+	struct TCP_Server_Info *server = cifs_pick_channel(ses);
+	char __user *arg = (char __user *)p;
+	struct smb_query_info qi;
+	struct smb_query_info __user *pqi;
+	int rc = 0;
+	int flags = CIFS_CP_CREATE_CLOSE_OP;
+	struct smb2_query_info_rsp *qi_rsp = NULL;
+	struct smb2_ioctl_rsp *io_rsp = NULL;
+	void *buffer = NULL;
+	int resp_buftype[3];
+	struct cifs_open_parms oparms;
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_fid fid;
+	unsigned int size[2];
+	void *data[2];
+	int create_options = is_dir ? CREATE_NOT_FILE : CREATE_NOT_DIR;
+	void (*free_req1_func)(struct smb_rqst *r);
+
+	vars = kzalloc(sizeof(*vars), GFP_ATOMIC);
+	if (vars == NULL)
+		return -ENOMEM;
+	rqst = &vars->rqst[0];
+	rsp_iov = &vars->rsp_iov[0];
+
+	resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
+
+	if (copy_from_user(&qi, arg, sizeof(struct smb_query_info))) {
+		rc = -EFAULT;
+		goto free_vars;
+	}
+	if (qi.output_buffer_length > 1024) {
+		rc = -EINVAL;
+		goto free_vars;
+	}
+
+	if (!ses || !server) {
+		rc = -EIO;
+		goto free_vars;
+	}
+
+	if (smb3_encryption_required(tcon))
+		flags |= CIFS_TRANSFORM_REQ;
+
+	if (qi.output_buffer_length) {
+		buffer = memdup_user(arg + sizeof(struct smb_query_info), qi.output_buffer_length);
+		if (IS_ERR(buffer)) {
+			rc = PTR_ERR(buffer);
+			goto free_vars;
+		}
+	}
+
+	/* Open */
+	rqst[0].rq_iov = &vars->open_iov[0];
+	rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, create_options),
+		.fid = &fid,
+	};
+
+	if (qi.flags & PASSTHRU_FSCTL) {
+		switch (qi.info_type & FSCTL_DEVICE_ACCESS_MASK) {
+		case FSCTL_DEVICE_ACCESS_FILE_READ_WRITE_ACCESS:
+			oparms.desired_access = FILE_READ_DATA | FILE_WRITE_DATA | FILE_READ_ATTRIBUTES | SYNCHRONIZE;
+			break;
+		case FSCTL_DEVICE_ACCESS_FILE_ANY_ACCESS:
+			oparms.desired_access = GENERIC_ALL;
+			break;
+		case FSCTL_DEVICE_ACCESS_FILE_READ_ACCESS:
+			oparms.desired_access = GENERIC_READ;
+			break;
+		case FSCTL_DEVICE_ACCESS_FILE_WRITE_ACCESS:
+			oparms.desired_access = GENERIC_WRITE;
+			break;
+		}
+	} else if (qi.flags & PASSTHRU_SET_INFO) {
+		oparms.desired_access = GENERIC_WRITE;
+	} else {
+		oparms.desired_access = FILE_READ_ATTRIBUTES | READ_CONTROL;
+	}
+
+	rc = SMB2_open_init(tcon, server,
+			    &rqst[0], &oplock, &oparms, path);
+	if (rc)
+		goto free_output_buffer;
+	smb2_set_next_command(tcon, &rqst[0]);
+
+	/* Query */
+	if (qi.flags & PASSTHRU_FSCTL) {
+		/* Can eventually relax perm check since server enforces too */
+		if (!capable(CAP_SYS_ADMIN)) {
+			rc = -EPERM;
+			goto free_open_req;
+		}
+		rqst[1].rq_iov = &vars->io_iov[0];
+		rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
+
+		rc = SMB2_ioctl_init(tcon, server, &rqst[1], COMPOUND_FID, COMPOUND_FID,
+				     qi.info_type, buffer, qi.output_buffer_length,
+				     CIFSMaxBufSize - MAX_SMB2_CREATE_RESPONSE_SIZE -
+				     MAX_SMB2_CLOSE_RESPONSE_SIZE);
+		free_req1_func = SMB2_ioctl_free;
+	} else if (qi.flags == PASSTHRU_SET_INFO) {
+		/* Can eventually relax perm check since server enforces too */
+		if (!capable(CAP_SYS_ADMIN)) {
+			rc = -EPERM;
+			goto free_open_req;
+		}
+		if (qi.output_buffer_length < 8) {
+			rc = -EINVAL;
+			goto free_open_req;
+		}
+		rqst[1].rq_iov = &vars->si_iov[0];
+		rqst[1].rq_nvec = 1;
+
+		/* MS-FSCC 2.4.13 FileEndOfFileInformation */
+		size[0] = 8;
+		data[0] = buffer;
+
+		rc = SMB2_set_info_init(tcon, server, &rqst[1], COMPOUND_FID, COMPOUND_FID,
+					current->tgid, FILE_END_OF_FILE_INFORMATION,
+					SMB2_O_INFO_FILE, 0, data, size);
+		free_req1_func = SMB2_set_info_free;
+	} else if (qi.flags == PASSTHRU_QUERY_INFO) {
+		rqst[1].rq_iov = &vars->qi_iov[0];
+		rqst[1].rq_nvec = 1;
+
+		rc = SMB2_query_info_init(tcon, server,
+				  &rqst[1], COMPOUND_FID,
+				  COMPOUND_FID, qi.file_info_class,
+				  qi.info_type, qi.additional_information,
+				  qi.input_buffer_length,
+				  qi.output_buffer_length, buffer);
+		free_req1_func = SMB2_query_info_free;
+	} else { /* unknown flags */
+		cifs_tcon_dbg(VFS, "Invalid passthru query flags: 0x%x\n",
+			      qi.flags);
+		rc = -EINVAL;
+	}
+
+	if (rc)
+		goto free_open_req;
+	smb2_set_next_command(tcon, &rqst[1]);
+	smb2_set_related(&rqst[1]);
+
+	/* Close */
+	rqst[2].rq_iov = &vars->close_iov[0];
+	rqst[2].rq_nvec = 1;
+
+	rc = SMB2_close_init(tcon, server,
+			     &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
+	if (rc)
+		goto free_req_1;
+	smb2_set_related(&rqst[2]);
+
+	rc = compound_send_recv(xid, ses, server,
+				flags, 3, rqst,
+				resp_buftype, rsp_iov);
+	if (rc)
+		goto out;
+
+	/* No need to bump num_remote_opens since handle immediately closed */
+	if (qi.flags & PASSTHRU_FSCTL) {
+		pqi = (struct smb_query_info __user *)arg;
+		io_rsp = (struct smb2_ioctl_rsp *)rsp_iov[1].iov_base;
+		if (le32_to_cpu(io_rsp->OutputCount) < qi.input_buffer_length)
+			qi.input_buffer_length = le32_to_cpu(io_rsp->OutputCount);
+		if (qi.input_buffer_length > 0 &&
+		    le32_to_cpu(io_rsp->OutputOffset) + qi.input_buffer_length
+		    > rsp_iov[1].iov_len) {
+			rc = -EFAULT;
+			goto out;
+		}
+
+		if (copy_to_user(&pqi->input_buffer_length,
+				 &qi.input_buffer_length,
+				 sizeof(qi.input_buffer_length))) {
+			rc = -EFAULT;
+			goto out;
+		}
+
+		if (copy_to_user((void __user *)pqi + sizeof(struct smb_query_info),
+				 (const void *)io_rsp + le32_to_cpu(io_rsp->OutputOffset),
+				 qi.input_buffer_length))
+			rc = -EFAULT;
+	} else {
+		pqi = (struct smb_query_info __user *)arg;
+		qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
+		if (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length)
+			qi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength);
+		if (copy_to_user(&pqi->input_buffer_length,
+				 &qi.input_buffer_length,
+				 sizeof(qi.input_buffer_length))) {
+			rc = -EFAULT;
+			goto out;
+		}
+
+		if (copy_to_user(pqi + 1, qi_rsp->Buffer,
+				 qi.input_buffer_length))
+			rc = -EFAULT;
+	}
+
+out:
+	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+	free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
+	free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
+	SMB2_close_free(&rqst[2]);
+free_req_1:
+	free_req1_func(&rqst[1]);
+free_open_req:
+	SMB2_open_free(&rqst[0]);
+free_output_buffer:
+	kfree(buffer);
+free_vars:
+	kfree(vars);
+	return rc;
+}
+
+static ssize_t
+smb2_copychunk_range(const unsigned int xid,
+			struct cifsFileInfo *srcfile,
+			struct cifsFileInfo *trgtfile, u64 src_off,
+			u64 len, u64 dest_off)
+{
+	int rc;
+	unsigned int ret_data_len;
+	struct copychunk_ioctl *pcchunk;
+	struct copychunk_ioctl_rsp *retbuf = NULL;
+	struct cifs_tcon *tcon;
+	int chunks_copied = 0;
+	bool chunk_sizes_updated = false;
+	ssize_t bytes_written, total_bytes_written = 0;
+
+	pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
+	if (pcchunk == NULL)
+		return -ENOMEM;
+
+	cifs_dbg(FYI, "%s: about to call request res key\n", __func__);
+	/* Request a key from the server to identify the source of the copy */
+	rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
+				srcfile->fid.persistent_fid,
+				srcfile->fid.volatile_fid, pcchunk);
+
+	/* Note: request_res_key sets res_key null only if rc !=0 */
+	if (rc)
+		goto cchunk_out;
+
+	/* For now array only one chunk long, will make more flexible later */
+	pcchunk->ChunkCount = cpu_to_le32(1);
+	pcchunk->Reserved = 0;
+	pcchunk->Reserved2 = 0;
+
+	tcon = tlink_tcon(trgtfile->tlink);
+
+	while (len > 0) {
+		pcchunk->SourceOffset = cpu_to_le64(src_off);
+		pcchunk->TargetOffset = cpu_to_le64(dest_off);
+		pcchunk->Length =
+			cpu_to_le32(min_t(u64, len, tcon->max_bytes_chunk));
+
+		/* Request server copy to target from src identified by key */
+		kfree(retbuf);
+		retbuf = NULL;
+		rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
+			trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
+			(char *)pcchunk, sizeof(struct copychunk_ioctl),
+			CIFSMaxBufSize, (char **)&retbuf, &ret_data_len);
+		if (rc == 0) {
+			if (ret_data_len !=
+					sizeof(struct copychunk_ioctl_rsp)) {
+				cifs_tcon_dbg(VFS, "Invalid cchunk response size\n");
+				rc = -EIO;
+				goto cchunk_out;
+			}
+			if (retbuf->TotalBytesWritten == 0) {
+				cifs_dbg(FYI, "no bytes copied\n");
+				rc = -EIO;
+				goto cchunk_out;
+			}
+			/*
+			 * Check if server claimed to write more than we asked
+			 */
+			if (le32_to_cpu(retbuf->TotalBytesWritten) >
+			    le32_to_cpu(pcchunk->Length)) {
+				cifs_tcon_dbg(VFS, "Invalid copy chunk response\n");
+				rc = -EIO;
+				goto cchunk_out;
+			}
+			if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
+				cifs_tcon_dbg(VFS, "Invalid num chunks written\n");
+				rc = -EIO;
+				goto cchunk_out;
+			}
+			chunks_copied++;
+
+			bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
+			src_off += bytes_written;
+			dest_off += bytes_written;
+			len -= bytes_written;
+			total_bytes_written += bytes_written;
+
+			cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
+				le32_to_cpu(retbuf->ChunksWritten),
+				le32_to_cpu(retbuf->ChunkBytesWritten),
+				bytes_written);
+		} else if (rc == -EINVAL) {
+			if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
+				goto cchunk_out;
+
+			cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
+				le32_to_cpu(retbuf->ChunksWritten),
+				le32_to_cpu(retbuf->ChunkBytesWritten),
+				le32_to_cpu(retbuf->TotalBytesWritten));
+
+			/*
+			 * Check if this is the first request using these sizes,
+			 * (ie check if copy succeed once with original sizes
+			 * and check if the server gave us different sizes after
+			 * we already updated max sizes on previous request).
+			 * if not then why is the server returning an error now
+			 */
+			if ((chunks_copied != 0) || chunk_sizes_updated)
+				goto cchunk_out;
+
+			/* Check that server is not asking us to grow size */
+			if (le32_to_cpu(retbuf->ChunkBytesWritten) <
+					tcon->max_bytes_chunk)
+				tcon->max_bytes_chunk =
+					le32_to_cpu(retbuf->ChunkBytesWritten);
+			else
+				goto cchunk_out; /* server gave us bogus size */
+
+			/* No need to change MaxChunks since already set to 1 */
+			chunk_sizes_updated = true;
+		} else
+			goto cchunk_out;
+	}
+
+cchunk_out:
+	kfree(pcchunk);
+	kfree(retbuf);
+	if (rc)
+		return rc;
+	else
+		return total_bytes_written;
+}
+
+static int
+smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
+		struct cifs_fid *fid)
+{
+	return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
+}
+
+static unsigned int
+smb2_read_data_offset(char *buf)
+{
+	struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
+
+	return rsp->DataOffset;
+}
+
+static unsigned int
+smb2_read_data_length(char *buf, bool in_remaining)
+{
+	struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
+
+	if (in_remaining)
+		return le32_to_cpu(rsp->DataRemaining);
+
+	return le32_to_cpu(rsp->DataLength);
+}
+
+
+static int
+smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
+	       struct cifs_io_parms *parms, unsigned int *bytes_read,
+	       char **buf, int *buf_type)
+{
+	parms->persistent_fid = pfid->persistent_fid;
+	parms->volatile_fid = pfid->volatile_fid;
+	return SMB2_read(xid, parms, bytes_read, buf, buf_type);
+}
+
+static int
+smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
+		struct cifs_io_parms *parms, unsigned int *written,
+		struct kvec *iov, unsigned long nr_segs)
+{
+
+	parms->persistent_fid = pfid->persistent_fid;
+	parms->volatile_fid = pfid->volatile_fid;
+	return SMB2_write(xid, parms, written, iov, nr_segs);
+}
+
+/* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
+static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
+		struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
+{
+	struct cifsInodeInfo *cifsi;
+	int rc;
+
+	cifsi = CIFS_I(inode);
+
+	/* if file already sparse don't bother setting sparse again */
+	if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
+		return true; /* already sparse */
+
+	if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
+		return true; /* already not sparse */
+
+	/*
+	 * Can't check for sparse support on share the usual way via the
+	 * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
+	 * since Samba server doesn't set the flag on the share, yet
+	 * supports the set sparse FSCTL and returns sparse correctly
+	 * in the file attributes. If we fail setting sparse though we
+	 * mark that server does not support sparse files for this share
+	 * to avoid repeatedly sending the unsupported fsctl to server
+	 * if the file is repeatedly extended.
+	 */
+	if (tcon->broken_sparse_sup)
+		return false;
+
+	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
+			cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
+			&setsparse, 1, CIFSMaxBufSize, NULL, NULL);
+	if (rc) {
+		tcon->broken_sparse_sup = true;
+		cifs_dbg(FYI, "set sparse rc = %d\n", rc);
+		return false;
+	}
+
+	if (setsparse)
+		cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
+	else
+		cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
+
+	return true;
+}
+
+static int
+smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
+		   struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
+{
+	__le64 eof = cpu_to_le64(size);
+	struct inode *inode;
+
+	/*
+	 * If extending file more than one page make sparse. Many Linux fs
+	 * make files sparse by default when extending via ftruncate
+	 */
+	inode = d_inode(cfile->dentry);
+
+	if (!set_alloc && (size > inode->i_size + 8192)) {
+		__u8 set_sparse = 1;
+
+		/* whether set sparse succeeds or not, extend the file */
+		smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
+	}
+
+	return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
+			    cfile->fid.volatile_fid, cfile->pid, &eof);
+}
+
+static int
+smb2_duplicate_extents(const unsigned int xid,
+			struct cifsFileInfo *srcfile,
+			struct cifsFileInfo *trgtfile, u64 src_off,
+			u64 len, u64 dest_off)
+{
+	int rc;
+	unsigned int ret_data_len;
+	struct inode *inode;
+	struct duplicate_extents_to_file dup_ext_buf;
+	struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
+
+	/* server fileays advertise duplicate extent support with this flag */
+	if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
+	     FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
+		return -EOPNOTSUPP;
+
+	dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
+	dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
+	dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
+	dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
+	dup_ext_buf.ByteCount = cpu_to_le64(len);
+	cifs_dbg(FYI, "Duplicate extents: src off %lld dst off %lld len %lld\n",
+		src_off, dest_off, len);
+
+	inode = d_inode(trgtfile->dentry);
+	if (inode->i_size < dest_off + len) {
+		rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
+		if (rc)
+			goto duplicate_extents_out;
+
+		/*
+		 * Although also could set plausible allocation size (i_blocks)
+		 * here in addition to setting the file size, in reflink
+		 * it is likely that the target file is sparse. Its allocation
+		 * size will be queried on next revalidate, but it is important
+		 * to make sure that file's cached size is updated immediately
+		 */
+		cifs_setsize(inode, dest_off + len);
+	}
+	rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
+			trgtfile->fid.volatile_fid,
+			FSCTL_DUPLICATE_EXTENTS_TO_FILE,
+			(char *)&dup_ext_buf,
+			sizeof(struct duplicate_extents_to_file),
+			CIFSMaxBufSize, NULL,
+			&ret_data_len);
+
+	if (ret_data_len > 0)
+		cifs_dbg(FYI, "Non-zero response length in duplicate extents\n");
+
+duplicate_extents_out:
+	return rc;
+}
+
+static int
+smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
+		   struct cifsFileInfo *cfile)
+{
+	return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
+			    cfile->fid.volatile_fid);
+}
+
+static int
+smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
+		   struct cifsFileInfo *cfile)
+{
+	struct fsctl_set_integrity_information_req integr_info;
+	unsigned int ret_data_len;
+
+	integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
+	integr_info.Flags = 0;
+	integr_info.Reserved = 0;
+
+	return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
+			cfile->fid.volatile_fid,
+			FSCTL_SET_INTEGRITY_INFORMATION,
+			(char *)&integr_info,
+			sizeof(struct fsctl_set_integrity_information_req),
+			CIFSMaxBufSize, NULL,
+			&ret_data_len);
+
+}
+
+/* GMT Token is @GMT-YYYY.MM.DD-HH.MM.SS Unicode which is 48 bytes + null */
+#define GMT_TOKEN_SIZE 50
+
+#define MIN_SNAPSHOT_ARRAY_SIZE 16 /* See MS-SMB2 section 3.3.5.15.1 */
+
+/*
+ * Input buffer contains (empty) struct smb_snapshot array with size filled in
+ * For output see struct SRV_SNAPSHOT_ARRAY in MS-SMB2 section 2.2.32.2
+ */
+static int
+smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
+		   struct cifsFileInfo *cfile, void __user *ioc_buf)
+{
+	char *retbuf = NULL;
+	unsigned int ret_data_len = 0;
+	int rc;
+	u32 max_response_size;
+	struct smb_snapshot_array snapshot_in;
+
+	/*
+	 * On the first query to enumerate the list of snapshots available
+	 * for this volume the buffer begins with 0 (number of snapshots
+	 * which can be returned is zero since at that point we do not know
+	 * how big the buffer needs to be). On the second query,
+	 * it (ret_data_len) is set to number of snapshots so we can
+	 * know to set the maximum response size larger (see below).
+	 */
+	if (get_user(ret_data_len, (unsigned int __user *)ioc_buf))
+		return -EFAULT;
+
+	/*
+	 * Note that for snapshot queries that servers like Azure expect that
+	 * the first query be minimal size (and just used to get the number/size
+	 * of previous versions) so response size must be specified as EXACTLY
+	 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
+	 * of eight bytes.
+	 */
+	if (ret_data_len == 0)
+		max_response_size = MIN_SNAPSHOT_ARRAY_SIZE;
+	else
+		max_response_size = CIFSMaxBufSize;
+
+	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
+			cfile->fid.volatile_fid,
+			FSCTL_SRV_ENUMERATE_SNAPSHOTS,
+			NULL, 0 /* no input data */, max_response_size,
+			(char **)&retbuf,
+			&ret_data_len);
+	cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
+			rc, ret_data_len);
+	if (rc)
+		return rc;
+
+	if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
+		/* Fixup buffer */
+		if (copy_from_user(&snapshot_in, ioc_buf,
+		    sizeof(struct smb_snapshot_array))) {
+			rc = -EFAULT;
+			kfree(retbuf);
+			return rc;
+		}
+
+		/*
+		 * Check for min size, ie not large enough to fit even one GMT
+		 * token (snapshot).  On the first ioctl some users may pass in
+		 * smaller size (or zero) to simply get the size of the array
+		 * so the user space caller can allocate sufficient memory
+		 * and retry the ioctl again with larger array size sufficient
+		 * to hold all of the snapshot GMT tokens on the second try.
+		 */
+		if (snapshot_in.snapshot_array_size < GMT_TOKEN_SIZE)
+			ret_data_len = sizeof(struct smb_snapshot_array);
+
+		/*
+		 * We return struct SRV_SNAPSHOT_ARRAY, followed by
+		 * the snapshot array (of 50 byte GMT tokens) each
+		 * representing an available previous version of the data
+		 */
+		if (ret_data_len > (snapshot_in.snapshot_array_size +
+					sizeof(struct smb_snapshot_array)))
+			ret_data_len = snapshot_in.snapshot_array_size +
+					sizeof(struct smb_snapshot_array);
+
+		if (copy_to_user(ioc_buf, retbuf, ret_data_len))
+			rc = -EFAULT;
+	}
+
+	kfree(retbuf);
+	return rc;
+}
+
+
+
+static int
+smb3_notify(const unsigned int xid, struct file *pfile,
+	    void __user *ioc_buf, bool return_changes)
+{
+	struct smb3_notify_info notify;
+	struct smb3_notify_info __user *pnotify_buf;
+	struct dentry *dentry = pfile->f_path.dentry;
+	struct inode *inode = file_inode(pfile);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+	struct cifs_tcon *tcon;
+	const unsigned char *path;
+	char *returned_ioctl_info = NULL;
+	void *page = alloc_dentry_path();
+	__le16 *utf16_path = NULL;
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	int rc = 0;
+	__u32 ret_len = 0;
+
+	path = build_path_from_dentry(dentry, page);
+	if (IS_ERR(path)) {
+		rc = PTR_ERR(path);
+		goto notify_exit;
+	}
+
+	utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+	if (utf16_path == NULL) {
+		rc = -ENOMEM;
+		goto notify_exit;
+	}
+
+	if (return_changes) {
+		if (copy_from_user(&notify, ioc_buf, sizeof(struct smb3_notify_info))) {
+			rc = -EFAULT;
+			goto notify_exit;
+		}
+	} else {
+		if (copy_from_user(&notify, ioc_buf, sizeof(struct smb3_notify))) {
+			rc = -EFAULT;
+			goto notify_exit;
+		}
+		notify.data_len = 0;
+	}
+
+	tcon = cifs_sb_master_tcon(cifs_sb);
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = path,
+		.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, 0),
+		.fid = &fid,
+	};
+
+	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
+		       NULL);
+	if (rc)
+		goto notify_exit;
+
+	rc = SMB2_change_notify(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+				notify.watch_tree, notify.completion_filter,
+				notify.data_len, &returned_ioctl_info, &ret_len);
+
+	SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+
+	cifs_dbg(FYI, "change notify for path %s rc %d\n", path, rc);
+	if (return_changes && (ret_len > 0) && (notify.data_len > 0)) {
+		if (ret_len > notify.data_len)
+			ret_len = notify.data_len;
+		pnotify_buf = (struct smb3_notify_info __user *)ioc_buf;
+		if (copy_to_user(pnotify_buf->notify_data, returned_ioctl_info, ret_len))
+			rc = -EFAULT;
+		else if (copy_to_user(&pnotify_buf->data_len, &ret_len, sizeof(ret_len)))
+			rc = -EFAULT;
+	}
+	kfree(returned_ioctl_info);
+notify_exit:
+	free_dentry_path(page);
+	kfree(utf16_path);
+	return rc;
+}
+
+static int
+smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
+		     const char *path, struct cifs_sb_info *cifs_sb,
+		     struct cifs_fid *fid, __u16 search_flags,
+		     struct cifs_search_info *srch_inf)
+{
+	__le16 *utf16_path;
+	struct smb_rqst rqst[2];
+	struct kvec rsp_iov[2];
+	int resp_buftype[2];
+	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+	struct kvec qd_iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
+	int rc, flags = 0;
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct smb2_query_directory_rsp *qd_rsp = NULL;
+	struct smb2_create_rsp *op_rsp = NULL;
+	struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
+	int retry_count = 0;
+
+	utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+	if (!utf16_path)
+		return -ENOMEM;
+
+	if (smb3_encryption_required(tcon))
+		flags |= CIFS_TRANSFORM_REQ;
+
+	memset(rqst, 0, sizeof(rqst));
+	resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
+	memset(rsp_iov, 0, sizeof(rsp_iov));
+
+	/* Open */
+	memset(&open_iov, 0, sizeof(open_iov));
+	rqst[0].rq_iov = open_iov;
+	rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = path,
+		.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, 0),
+		.fid = fid,
+	};
+
+	rc = SMB2_open_init(tcon, server,
+			    &rqst[0], &oplock, &oparms, utf16_path);
+	if (rc)
+		goto qdf_free;
+	smb2_set_next_command(tcon, &rqst[0]);
+
+	/* Query directory */
+	srch_inf->entries_in_buffer = 0;
+	srch_inf->index_of_last_entry = 2;
+
+	memset(&qd_iov, 0, sizeof(qd_iov));
+	rqst[1].rq_iov = qd_iov;
+	rqst[1].rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
+
+	rc = SMB2_query_directory_init(xid, tcon, server,
+				       &rqst[1],
+				       COMPOUND_FID, COMPOUND_FID,
+				       0, srch_inf->info_level);
+	if (rc)
+		goto qdf_free;
+
+	smb2_set_related(&rqst[1]);
+
+again:
+	rc = compound_send_recv(xid, tcon->ses, server,
+				flags, 2, rqst,
+				resp_buftype, rsp_iov);
+
+	if (rc == -EAGAIN && retry_count++ < 10)
+		goto again;
+
+	/* If the open failed there is nothing to do */
+	op_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
+	if (op_rsp == NULL || op_rsp->hdr.Status != STATUS_SUCCESS) {
+		cifs_dbg(FYI, "query_dir_first: open failed rc=%d\n", rc);
+		goto qdf_free;
+	}
+	fid->persistent_fid = op_rsp->PersistentFileId;
+	fid->volatile_fid = op_rsp->VolatileFileId;
+
+	/* Anything else than ENODATA means a genuine error */
+	if (rc && rc != -ENODATA) {
+		SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
+		cifs_dbg(FYI, "query_dir_first: query directory failed rc=%d\n", rc);
+		trace_smb3_query_dir_err(xid, fid->persistent_fid,
+					 tcon->tid, tcon->ses->Suid, 0, 0, rc);
+		goto qdf_free;
+	}
+
+	atomic_inc(&tcon->num_remote_opens);
+
+	qd_rsp = (struct smb2_query_directory_rsp *)rsp_iov[1].iov_base;
+	if (qd_rsp->hdr.Status == STATUS_NO_MORE_FILES) {
+		trace_smb3_query_dir_done(xid, fid->persistent_fid,
+					  tcon->tid, tcon->ses->Suid, 0, 0);
+		srch_inf->endOfSearch = true;
+		rc = 0;
+		goto qdf_free;
+	}
+
+	rc = smb2_parse_query_directory(tcon, &rsp_iov[1], resp_buftype[1],
+					srch_inf);
+	if (rc) {
+		trace_smb3_query_dir_err(xid, fid->persistent_fid, tcon->tid,
+			tcon->ses->Suid, 0, 0, rc);
+		goto qdf_free;
+	}
+	resp_buftype[1] = CIFS_NO_BUFFER;
+
+	trace_smb3_query_dir_done(xid, fid->persistent_fid, tcon->tid,
+			tcon->ses->Suid, 0, srch_inf->entries_in_buffer);
+
+ qdf_free:
+	kfree(utf16_path);
+	SMB2_open_free(&rqst[0]);
+	SMB2_query_directory_free(&rqst[1]);
+	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+	free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
+	return rc;
+}
+
+static int
+smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
+		    struct cifs_fid *fid, __u16 search_flags,
+		    struct cifs_search_info *srch_inf)
+{
+	return SMB2_query_directory(xid, tcon, fid->persistent_fid,
+				    fid->volatile_fid, 0, srch_inf);
+}
+
+static int
+smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
+	       struct cifs_fid *fid)
+{
+	return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
+}
+
+/*
+ * If we negotiate SMB2 protocol and get STATUS_PENDING - update
+ * the number of credits and return true. Otherwise - return false.
+ */
+static bool
+smb2_is_status_pending(char *buf, struct TCP_Server_Info *server)
+{
+	struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
+	int scredits, in_flight;
+
+	if (shdr->Status != STATUS_PENDING)
+		return false;
+
+	if (shdr->CreditRequest) {
+		spin_lock(&server->req_lock);
+		server->credits += le16_to_cpu(shdr->CreditRequest);
+		scredits = server->credits;
+		in_flight = server->in_flight;
+		spin_unlock(&server->req_lock);
+		wake_up(&server->request_q);
+
+		trace_smb3_pend_credits(server->CurrentMid,
+				server->conn_id, server->hostname, scredits,
+				le16_to_cpu(shdr->CreditRequest), in_flight);
+		cifs_dbg(FYI, "%s: status pending add %u credits total=%d\n",
+				__func__, le16_to_cpu(shdr->CreditRequest), scredits);
+	}
+
+	return true;
+}
+
+static bool
+smb2_is_session_expired(char *buf)
+{
+	struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
+
+	if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED &&
+	    shdr->Status != STATUS_USER_SESSION_DELETED)
+		return false;
+
+	trace_smb3_ses_expired(le32_to_cpu(shdr->Id.SyncId.TreeId),
+			       le64_to_cpu(shdr->SessionId),
+			       le16_to_cpu(shdr->Command),
+			       le64_to_cpu(shdr->MessageId));
+	cifs_dbg(FYI, "Session expired or deleted\n");
+
+	return true;
+}
+
+static bool
+smb2_is_status_io_timeout(char *buf)
+{
+	struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
+
+	if (shdr->Status == STATUS_IO_TIMEOUT)
+		return true;
+	else
+		return false;
+}
+
+static void
+smb2_is_network_name_deleted(char *buf, struct TCP_Server_Info *server)
+{
+	struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
+	struct TCP_Server_Info *pserver;
+	struct cifs_ses *ses;
+	struct cifs_tcon *tcon;
+
+	if (shdr->Status != STATUS_NETWORK_NAME_DELETED)
+		return;
+
+	/* If server is a channel, select the primary channel */
+	pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
+
+	spin_lock(&cifs_tcp_ses_lock);
+	list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
+		list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
+			if (tcon->tid == le32_to_cpu(shdr->Id.SyncId.TreeId)) {
+				spin_lock(&tcon->tc_lock);
+				tcon->need_reconnect = true;
+				spin_unlock(&tcon->tc_lock);
+				spin_unlock(&cifs_tcp_ses_lock);
+				pr_warn_once("Server share %s deleted.\n",
+					     tcon->tree_name);
+				return;
+			}
+		}
+	}
+	spin_unlock(&cifs_tcp_ses_lock);
+}
+
+static int
+smb2_oplock_response(struct cifs_tcon *tcon, __u64 persistent_fid,
+		__u64 volatile_fid, __u16 net_fid, struct cifsInodeInfo *cinode)
+{
+	if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
+		return SMB2_lease_break(0, tcon, cinode->lease_key,
+					smb2_get_lease_state(cinode));
+
+	return SMB2_oplock_break(0, tcon, persistent_fid, volatile_fid,
+				 CIFS_CACHE_READ(cinode) ? 1 : 0);
+}
+
+void
+smb2_set_related(struct smb_rqst *rqst)
+{
+	struct smb2_hdr *shdr;
+
+	shdr = (struct smb2_hdr *)(rqst->rq_iov[0].iov_base);
+	if (shdr == NULL) {
+		cifs_dbg(FYI, "shdr NULL in smb2_set_related\n");
+		return;
+	}
+	shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
+}
+
+char smb2_padding[7] = {0, 0, 0, 0, 0, 0, 0};
+
+void
+smb2_set_next_command(struct cifs_tcon *tcon, struct smb_rqst *rqst)
+{
+	struct smb2_hdr *shdr;
+	struct cifs_ses *ses = tcon->ses;
+	struct TCP_Server_Info *server = ses->server;
+	unsigned long len = smb_rqst_len(server, rqst);
+	int i, num_padding;
+
+	shdr = (struct smb2_hdr *)(rqst->rq_iov[0].iov_base);
+	if (shdr == NULL) {
+		cifs_dbg(FYI, "shdr NULL in smb2_set_next_command\n");
+		return;
+	}
+
+	/* SMB headers in a compound are 8 byte aligned. */
+
+	/* No padding needed */
+	if (!(len & 7))
+		goto finished;
+
+	num_padding = 8 - (len & 7);
+	if (!smb3_encryption_required(tcon)) {
+		/*
+		 * If we do not have encryption then we can just add an extra
+		 * iov for the padding.
+		 */
+		rqst->rq_iov[rqst->rq_nvec].iov_base = smb2_padding;
+		rqst->rq_iov[rqst->rq_nvec].iov_len = num_padding;
+		rqst->rq_nvec++;
+		len += num_padding;
+	} else {
+		/*
+		 * We can not add a small padding iov for the encryption case
+		 * because the encryption framework can not handle the padding
+		 * iovs.
+		 * We have to flatten this into a single buffer and add
+		 * the padding to it.
+		 */
+		for (i = 1; i < rqst->rq_nvec; i++) {
+			memcpy(rqst->rq_iov[0].iov_base +
+			       rqst->rq_iov[0].iov_len,
+			       rqst->rq_iov[i].iov_base,
+			       rqst->rq_iov[i].iov_len);
+			rqst->rq_iov[0].iov_len += rqst->rq_iov[i].iov_len;
+		}
+		memset(rqst->rq_iov[0].iov_base + rqst->rq_iov[0].iov_len,
+		       0, num_padding);
+		rqst->rq_iov[0].iov_len += num_padding;
+		len += num_padding;
+		rqst->rq_nvec = 1;
+	}
+
+ finished:
+	shdr->NextCommand = cpu_to_le32(len);
+}
+
+/*
+ * Passes the query info response back to the caller on success.
+ * Caller need to free this with free_rsp_buf().
+ */
+int
+smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
+			 const char *path, u32 desired_access,
+			 u32 class, u32 type, u32 output_len,
+			 struct kvec *rsp, int *buftype,
+			 struct cifs_sb_info *cifs_sb)
+{
+	struct cifs_ses *ses = tcon->ses;
+	struct TCP_Server_Info *server = cifs_pick_channel(ses);
+	int flags = CIFS_CP_CREATE_CLOSE_OP;
+	struct smb_rqst rqst[3];
+	int resp_buftype[3];
+	struct kvec rsp_iov[3];
+	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+	struct kvec qi_iov[1];
+	struct kvec close_iov[1];
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+	int rc;
+	__le16 *utf16_path;
+	struct cached_fid *cfid = NULL;
+
+	if (!path)
+		path = "";
+	utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+	if (!utf16_path)
+		return -ENOMEM;
+
+	if (smb3_encryption_required(tcon))
+		flags |= CIFS_TRANSFORM_REQ;
+
+	memset(rqst, 0, sizeof(rqst));
+	resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
+	memset(rsp_iov, 0, sizeof(rsp_iov));
+
+	/*
+	 * We can only call this for things we know are directories.
+	 */
+	if (!strcmp(path, ""))
+		open_cached_dir(xid, tcon, path, cifs_sb, false,
+				&cfid); /* cfid null if open dir failed */
+
+	memset(&open_iov, 0, sizeof(open_iov));
+	rqst[0].rq_iov = open_iov;
+	rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = path,
+		.desired_access = desired_access,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, 0),
+		.fid = &fid,
+	};
+
+	rc = SMB2_open_init(tcon, server,
+			    &rqst[0], &oplock, &oparms, utf16_path);
+	if (rc)
+		goto qic_exit;
+	smb2_set_next_command(tcon, &rqst[0]);
+
+	memset(&qi_iov, 0, sizeof(qi_iov));
+	rqst[1].rq_iov = qi_iov;
+	rqst[1].rq_nvec = 1;
+
+	if (cfid) {
+		rc = SMB2_query_info_init(tcon, server,
+					  &rqst[1],
+					  cfid->fid.persistent_fid,
+					  cfid->fid.volatile_fid,
+					  class, type, 0,
+					  output_len, 0,
+					  NULL);
+	} else {
+		rc = SMB2_query_info_init(tcon, server,
+					  &rqst[1],
+					  COMPOUND_FID,
+					  COMPOUND_FID,
+					  class, type, 0,
+					  output_len, 0,
+					  NULL);
+	}
+	if (rc)
+		goto qic_exit;
+	if (!cfid) {
+		smb2_set_next_command(tcon, &rqst[1]);
+		smb2_set_related(&rqst[1]);
+	}
+
+	memset(&close_iov, 0, sizeof(close_iov));
+	rqst[2].rq_iov = close_iov;
+	rqst[2].rq_nvec = 1;
+
+	rc = SMB2_close_init(tcon, server,
+			     &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
+	if (rc)
+		goto qic_exit;
+	smb2_set_related(&rqst[2]);
+
+	if (cfid) {
+		rc = compound_send_recv(xid, ses, server,
+					flags, 1, &rqst[1],
+					&resp_buftype[1], &rsp_iov[1]);
+	} else {
+		rc = compound_send_recv(xid, ses, server,
+					flags, 3, rqst,
+					resp_buftype, rsp_iov);
+	}
+	if (rc) {
+		free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
+		if (rc == -EREMCHG) {
+			tcon->need_reconnect = true;
+			pr_warn_once("server share %s deleted\n",
+				     tcon->tree_name);
+		}
+		goto qic_exit;
+	}
+	*rsp = rsp_iov[1];
+	*buftype = resp_buftype[1];
+
+ qic_exit:
+	kfree(utf16_path);
+	SMB2_open_free(&rqst[0]);
+	SMB2_query_info_free(&rqst[1]);
+	SMB2_close_free(&rqst[2]);
+	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+	free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
+	if (cfid)
+		close_cached_dir(cfid);
+	return rc;
+}
+
+static int
+smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
+	     struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
+{
+	struct smb2_query_info_rsp *rsp;
+	struct smb2_fs_full_size_info *info = NULL;
+	struct kvec rsp_iov = {NULL, 0};
+	int buftype = CIFS_NO_BUFFER;
+	int rc;
+
+
+	rc = smb2_query_info_compound(xid, tcon, "",
+				      FILE_READ_ATTRIBUTES,
+				      FS_FULL_SIZE_INFORMATION,
+				      SMB2_O_INFO_FILESYSTEM,
+				      sizeof(struct smb2_fs_full_size_info),
+				      &rsp_iov, &buftype, cifs_sb);
+	if (rc)
+		goto qfs_exit;
+
+	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
+	buf->f_type = SMB2_SUPER_MAGIC;
+	info = (struct smb2_fs_full_size_info *)(
+		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
+	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
+			       le32_to_cpu(rsp->OutputBufferLength),
+			       &rsp_iov,
+			       sizeof(struct smb2_fs_full_size_info));
+	if (!rc)
+		smb2_copy_fs_info_to_kstatfs(info, buf);
+
+qfs_exit:
+	free_rsp_buf(buftype, rsp_iov.iov_base);
+	return rc;
+}
+
+static int
+smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
+	       struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
+{
+	int rc;
+	__le16 srch_path = 0; /* Null - open root of share */
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+
+	if (!tcon->posix_extensions)
+		return smb2_queryfs(xid, tcon, cifs_sb, buf);
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = "",
+		.desired_access = FILE_READ_ATTRIBUTES,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, 0),
+		.fid = &fid,
+	};
+
+	rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
+		       NULL, NULL);
+	if (rc)
+		return rc;
+
+	rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
+				   fid.volatile_fid, buf);
+	buf->f_type = SMB2_SUPER_MAGIC;
+	SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+	return rc;
+}
+
+static bool
+smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
+{
+	return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
+	       ob1->fid.volatile_fid == ob2->fid.volatile_fid;
+}
+
+static int
+smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
+	       __u64 length, __u32 type, int lock, int unlock, bool wait)
+{
+	if (unlock && !lock)
+		type = SMB2_LOCKFLAG_UNLOCK;
+	return SMB2_lock(xid, tlink_tcon(cfile->tlink),
+			 cfile->fid.persistent_fid, cfile->fid.volatile_fid,
+			 current->tgid, length, offset, type, wait);
+}
+
+static void
+smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
+{
+	memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
+}
+
+static void
+smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
+{
+	memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
+}
+
+static void
+smb2_new_lease_key(struct cifs_fid *fid)
+{
+	generate_random_uuid(fid->lease_key);
+}
+
+static int
+smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
+		   const char *search_name,
+		   struct dfs_info3_param **target_nodes,
+		   unsigned int *num_of_nodes,
+		   const struct nls_table *nls_codepage, int remap)
+{
+	int rc;
+	__le16 *utf16_path = NULL;
+	int utf16_path_len = 0;
+	struct cifs_tcon *tcon;
+	struct fsctl_get_dfs_referral_req *dfs_req = NULL;
+	struct get_dfs_referral_rsp *dfs_rsp = NULL;
+	u32 dfs_req_size = 0, dfs_rsp_size = 0;
+	int retry_count = 0;
+
+	cifs_dbg(FYI, "%s: path: %s\n", __func__, search_name);
+
+	/*
+	 * Try to use the IPC tcon, otherwise just use any
+	 */
+	tcon = ses->tcon_ipc;
+	if (tcon == NULL) {
+		spin_lock(&cifs_tcp_ses_lock);
+		tcon = list_first_entry_or_null(&ses->tcon_list,
+						struct cifs_tcon,
+						tcon_list);
+		if (tcon)
+			tcon->tc_count++;
+		spin_unlock(&cifs_tcp_ses_lock);
+	}
+
+	if (tcon == NULL) {
+		cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
+			 ses);
+		rc = -ENOTCONN;
+		goto out;
+	}
+
+	utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
+					   &utf16_path_len,
+					   nls_codepage, remap);
+	if (!utf16_path) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
+	dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
+	if (!dfs_req) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	/* Highest DFS referral version understood */
+	dfs_req->MaxReferralLevel = DFS_VERSION;
+
+	/* Path to resolve in an UTF-16 null-terminated string */
+	memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
+
+	do {
+		rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
+				FSCTL_DFS_GET_REFERRALS,
+				(char *)dfs_req, dfs_req_size, CIFSMaxBufSize,
+				(char **)&dfs_rsp, &dfs_rsp_size);
+		if (!is_retryable_error(rc))
+			break;
+		usleep_range(512, 2048);
+	} while (++retry_count < 5);
+
+	if (!rc && !dfs_rsp)
+		rc = -EIO;
+	if (rc) {
+		if (!is_retryable_error(rc) && rc != -ENOENT && rc != -EOPNOTSUPP)
+			cifs_tcon_dbg(VFS, "%s: ioctl error: rc=%d\n", __func__, rc);
+		goto out;
+	}
+
+	rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
+				 num_of_nodes, target_nodes,
+				 nls_codepage, remap, search_name,
+				 true /* is_unicode */);
+	if (rc) {
+		cifs_tcon_dbg(VFS, "parse error in %s rc=%d\n", __func__, rc);
+		goto out;
+	}
+
+ out:
+	if (tcon && !tcon->ipc) {
+		/* ipc tcons are not refcounted */
+		spin_lock(&cifs_tcp_ses_lock);
+		tcon->tc_count--;
+		/* tc_count can never go negative */
+		WARN_ON(tcon->tc_count < 0);
+		spin_unlock(&cifs_tcp_ses_lock);
+	}
+	kfree(utf16_path);
+	kfree(dfs_req);
+	kfree(dfs_rsp);
+	return rc;
+}
+
+static int
+parse_reparse_posix(struct reparse_posix_data *symlink_buf,
+		      u32 plen, char **target_path,
+		      struct cifs_sb_info *cifs_sb)
+{
+	unsigned int len;
+
+	/* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */
+	len = le16_to_cpu(symlink_buf->ReparseDataLength);
+
+	if (le64_to_cpu(symlink_buf->InodeType) != NFS_SPECFILE_LNK) {
+		cifs_dbg(VFS, "%lld not a supported symlink type\n",
+			le64_to_cpu(symlink_buf->InodeType));
+		return -EOPNOTSUPP;
+	}
+
+	*target_path = cifs_strndup_from_utf16(
+				symlink_buf->PathBuffer,
+				len, true, cifs_sb->local_nls);
+	if (!(*target_path))
+		return -ENOMEM;
+
+	convert_delimiter(*target_path, '/');
+	cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
+
+	return 0;
+}
+
+static int
+parse_reparse_symlink(struct reparse_symlink_data_buffer *symlink_buf,
+		      u32 plen, char **target_path,
+		      struct cifs_sb_info *cifs_sb)
+{
+	unsigned int sub_len;
+	unsigned int sub_offset;
+
+	/* We handle Symbolic Link reparse tag here. See: MS-FSCC 2.1.2.4 */
+
+	sub_offset = le16_to_cpu(symlink_buf->SubstituteNameOffset);
+	sub_len = le16_to_cpu(symlink_buf->SubstituteNameLength);
+	if (sub_offset + 20 > plen ||
+	    sub_offset + sub_len + 20 > plen) {
+		cifs_dbg(VFS, "srv returned malformed symlink buffer\n");
+		return -EIO;
+	}
+
+	*target_path = cifs_strndup_from_utf16(
+				symlink_buf->PathBuffer + sub_offset,
+				sub_len, true, cifs_sb->local_nls);
+	if (!(*target_path))
+		return -ENOMEM;
+
+	convert_delimiter(*target_path, '/');
+	cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
+
+	return 0;
+}
+
+static int
+parse_reparse_point(struct reparse_data_buffer *buf,
+		    u32 plen, char **target_path,
+		    struct cifs_sb_info *cifs_sb)
+{
+	if (plen < sizeof(struct reparse_data_buffer)) {
+		cifs_dbg(VFS, "reparse buffer is too small. Must be at least 8 bytes but was %d\n",
+			 plen);
+		return -EIO;
+	}
+
+	if (plen < le16_to_cpu(buf->ReparseDataLength) +
+	    sizeof(struct reparse_data_buffer)) {
+		cifs_dbg(VFS, "srv returned invalid reparse buf length: %d\n",
+			 plen);
+		return -EIO;
+	}
+
+	/* See MS-FSCC 2.1.2 */
+	switch (le32_to_cpu(buf->ReparseTag)) {
+	case IO_REPARSE_TAG_NFS:
+		return parse_reparse_posix(
+			(struct reparse_posix_data *)buf,
+			plen, target_path, cifs_sb);
+	case IO_REPARSE_TAG_SYMLINK:
+		return parse_reparse_symlink(
+			(struct reparse_symlink_data_buffer *)buf,
+			plen, target_path, cifs_sb);
+	default:
+		cifs_dbg(VFS, "srv returned unknown symlink buffer tag:0x%08x\n",
+			 le32_to_cpu(buf->ReparseTag));
+		return -EOPNOTSUPP;
+	}
+}
+
+static int
+smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
+		   struct cifs_sb_info *cifs_sb, const char *full_path,
+		   char **target_path, bool is_reparse_point)
+{
+	int rc;
+	__le16 *utf16_path = NULL;
+	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+	struct kvec err_iov = {NULL, 0};
+	struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
+	int flags = CIFS_CP_CREATE_CLOSE_OP;
+	struct smb_rqst rqst[3];
+	int resp_buftype[3];
+	struct kvec rsp_iov[3];
+	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+	struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
+	struct kvec close_iov[1];
+	struct smb2_create_rsp *create_rsp;
+	struct smb2_ioctl_rsp *ioctl_rsp;
+	struct reparse_data_buffer *reparse_buf;
+	int create_options = is_reparse_point ? OPEN_REPARSE_POINT : 0;
+	u32 plen;
+
+	cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
+
+	*target_path = NULL;
+
+	if (smb3_encryption_required(tcon))
+		flags |= CIFS_TRANSFORM_REQ;
+
+	memset(rqst, 0, sizeof(rqst));
+	resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
+	memset(rsp_iov, 0, sizeof(rsp_iov));
+
+	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
+	if (!utf16_path)
+		return -ENOMEM;
+
+	/* Open */
+	memset(&open_iov, 0, sizeof(open_iov));
+	rqst[0].rq_iov = open_iov;
+	rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = full_path,
+		.desired_access = FILE_READ_ATTRIBUTES,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, create_options),
+		.fid = &fid,
+	};
+
+	rc = SMB2_open_init(tcon, server,
+			    &rqst[0], &oplock, &oparms, utf16_path);
+	if (rc)
+		goto querty_exit;
+	smb2_set_next_command(tcon, &rqst[0]);
+
+
+	/* IOCTL */
+	memset(&io_iov, 0, sizeof(io_iov));
+	rqst[1].rq_iov = io_iov;
+	rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
+
+	rc = SMB2_ioctl_init(tcon, server,
+			     &rqst[1], fid.persistent_fid,
+			     fid.volatile_fid, FSCTL_GET_REPARSE_POINT, NULL, 0,
+			     CIFSMaxBufSize -
+			     MAX_SMB2_CREATE_RESPONSE_SIZE -
+			     MAX_SMB2_CLOSE_RESPONSE_SIZE);
+	if (rc)
+		goto querty_exit;
+
+	smb2_set_next_command(tcon, &rqst[1]);
+	smb2_set_related(&rqst[1]);
+
+
+	/* Close */
+	memset(&close_iov, 0, sizeof(close_iov));
+	rqst[2].rq_iov = close_iov;
+	rqst[2].rq_nvec = 1;
+
+	rc = SMB2_close_init(tcon, server,
+			     &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
+	if (rc)
+		goto querty_exit;
+
+	smb2_set_related(&rqst[2]);
+
+	rc = compound_send_recv(xid, tcon->ses, server,
+				flags, 3, rqst,
+				resp_buftype, rsp_iov);
+
+	create_rsp = rsp_iov[0].iov_base;
+	if (create_rsp && create_rsp->hdr.Status)
+		err_iov = rsp_iov[0];
+	ioctl_rsp = rsp_iov[1].iov_base;
+
+	/*
+	 * Open was successful and we got an ioctl response.
+	 */
+	if ((rc == 0) && (is_reparse_point)) {
+		/* See MS-FSCC 2.3.23 */
+
+		reparse_buf = (struct reparse_data_buffer *)
+			((char *)ioctl_rsp +
+			 le32_to_cpu(ioctl_rsp->OutputOffset));
+		plen = le32_to_cpu(ioctl_rsp->OutputCount);
+
+		if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
+		    rsp_iov[1].iov_len) {
+			cifs_tcon_dbg(VFS, "srv returned invalid ioctl len: %d\n",
+				 plen);
+			rc = -EIO;
+			goto querty_exit;
+		}
+
+		rc = parse_reparse_point(reparse_buf, plen, target_path,
+					 cifs_sb);
+		goto querty_exit;
+	}
+
+	if (!rc || !err_iov.iov_base) {
+		rc = -ENOENT;
+		goto querty_exit;
+	}
+
+	rc = smb2_parse_symlink_response(cifs_sb, &err_iov, target_path);
+
+ querty_exit:
+	cifs_dbg(FYI, "query symlink rc %d\n", rc);
+	kfree(utf16_path);
+	SMB2_open_free(&rqst[0]);
+	SMB2_ioctl_free(&rqst[1]);
+	SMB2_close_free(&rqst[2]);
+	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+	free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
+	free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
+	return rc;
+}
+
+int
+smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon,
+		   struct cifs_sb_info *cifs_sb, const char *full_path,
+		   __u32 *tag)
+{
+	int rc;
+	__le16 *utf16_path = NULL;
+	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+	struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
+	int flags = CIFS_CP_CREATE_CLOSE_OP;
+	struct smb_rqst rqst[3];
+	int resp_buftype[3];
+	struct kvec rsp_iov[3];
+	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+	struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
+	struct kvec close_iov[1];
+	struct smb2_ioctl_rsp *ioctl_rsp;
+	struct reparse_data_buffer *reparse_buf;
+	u32 off, count, len;
+
+	cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
+
+	if (smb3_encryption_required(tcon))
+		flags |= CIFS_TRANSFORM_REQ;
+
+	memset(rqst, 0, sizeof(rqst));
+	resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
+	memset(rsp_iov, 0, sizeof(rsp_iov));
+
+	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
+	if (!utf16_path)
+		return -ENOMEM;
+
+	/*
+	 * setup smb2open - TODO add optimization to call cifs_get_readable_path
+	 * to see if there is a handle already open that we can use
+	 */
+	memset(&open_iov, 0, sizeof(open_iov));
+	rqst[0].rq_iov = open_iov;
+	rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = full_path,
+		.desired_access = FILE_READ_ATTRIBUTES,
+		.disposition = FILE_OPEN,
+		.create_options = cifs_create_options(cifs_sb, OPEN_REPARSE_POINT),
+		.fid = &fid,
+	};
+
+	rc = SMB2_open_init(tcon, server,
+			    &rqst[0], &oplock, &oparms, utf16_path);
+	if (rc)
+		goto query_rp_exit;
+	smb2_set_next_command(tcon, &rqst[0]);
+
+
+	/* IOCTL */
+	memset(&io_iov, 0, sizeof(io_iov));
+	rqst[1].rq_iov = io_iov;
+	rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
+
+	rc = SMB2_ioctl_init(tcon, server,
+			     &rqst[1], COMPOUND_FID,
+			     COMPOUND_FID, FSCTL_GET_REPARSE_POINT, NULL, 0,
+			     CIFSMaxBufSize -
+			     MAX_SMB2_CREATE_RESPONSE_SIZE -
+			     MAX_SMB2_CLOSE_RESPONSE_SIZE);
+	if (rc)
+		goto query_rp_exit;
+
+	smb2_set_next_command(tcon, &rqst[1]);
+	smb2_set_related(&rqst[1]);
+
+
+	/* Close */
+	memset(&close_iov, 0, sizeof(close_iov));
+	rqst[2].rq_iov = close_iov;
+	rqst[2].rq_nvec = 1;
+
+	rc = SMB2_close_init(tcon, server,
+			     &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
+	if (rc)
+		goto query_rp_exit;
+
+	smb2_set_related(&rqst[2]);
+
+	rc = compound_send_recv(xid, tcon->ses, server,
+				flags, 3, rqst,
+				resp_buftype, rsp_iov);
+
+	ioctl_rsp = rsp_iov[1].iov_base;
+
+	/*
+	 * Open was successful and we got an ioctl response.
+	 */
+	if (rc == 0) {
+		/* See MS-FSCC 2.3.23 */
+		off = le32_to_cpu(ioctl_rsp->OutputOffset);
+		count = le32_to_cpu(ioctl_rsp->OutputCount);
+		if (check_add_overflow(off, count, &len) ||
+		    len > rsp_iov[1].iov_len) {
+			cifs_tcon_dbg(VFS, "%s: invalid ioctl: off=%d count=%d\n",
+				      __func__, off, count);
+			rc = -EIO;
+			goto query_rp_exit;
+		}
+
+		reparse_buf = (void *)((u8 *)ioctl_rsp + off);
+		len = sizeof(*reparse_buf);
+		if (count < len ||
+		    count < le16_to_cpu(reparse_buf->ReparseDataLength) + len) {
+			cifs_tcon_dbg(VFS, "%s: invalid ioctl: off=%d count=%d\n",
+				      __func__, off, count);
+			rc = -EIO;
+			goto query_rp_exit;
+		}
+		*tag = le32_to_cpu(reparse_buf->ReparseTag);
+	}
+
+ query_rp_exit:
+	kfree(utf16_path);
+	SMB2_open_free(&rqst[0]);
+	SMB2_ioctl_free(&rqst[1]);
+	SMB2_close_free(&rqst[2]);
+	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+	free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
+	free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
+	return rc;
+}
+
+static struct cifs_ntsd *
+get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
+		    const struct cifs_fid *cifsfid, u32 *pacllen, u32 info)
+{
+	struct cifs_ntsd *pntsd = NULL;
+	unsigned int xid;
+	int rc = -EOPNOTSUPP;
+	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
+
+	if (IS_ERR(tlink))
+		return ERR_CAST(tlink);
+
+	xid = get_xid();
+	cifs_dbg(FYI, "trying to get acl\n");
+
+	rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
+			    cifsfid->volatile_fid, (void **)&pntsd, pacllen,
+			    info);
+	free_xid(xid);
+
+	cifs_put_tlink(tlink);
+
+	cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
+	if (rc)
+		return ERR_PTR(rc);
+	return pntsd;
+
+}
+
+static struct cifs_ntsd *
+get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
+		     const char *path, u32 *pacllen, u32 info)
+{
+	struct cifs_ntsd *pntsd = NULL;
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	unsigned int xid;
+	int rc;
+	struct cifs_tcon *tcon;
+	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
+	struct cifs_fid fid;
+	struct cifs_open_parms oparms;
+	__le16 *utf16_path;
+
+	cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
+	if (IS_ERR(tlink))
+		return ERR_CAST(tlink);
+
+	tcon = tlink_tcon(tlink);
+	xid = get_xid();
+
+	utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+	if (!utf16_path) {
+		rc = -ENOMEM;
+		free_xid(xid);
+		return ERR_PTR(rc);
+	}
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.path = path,
+		.desired_access = READ_CONTROL,
+		.disposition = FILE_OPEN,
+		/*
+		 * When querying an ACL, even if the file is a symlink
+		 * we want to open the source not the target, and so
+		 * the protocol requires that the client specify this
+		 * flag when opening a reparse point
+		 */
+		.create_options = cifs_create_options(cifs_sb, 0) |
+				  OPEN_REPARSE_POINT,
+		.fid = &fid,
+	};
+
+	if (info & SACL_SECINFO)
+		oparms.desired_access |= SYSTEM_SECURITY;
+
+	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
+		       NULL);
+	kfree(utf16_path);
+	if (!rc) {
+		rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
+				    fid.volatile_fid, (void **)&pntsd, pacllen,
+				    info);
+		SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+	}
+
+	cifs_put_tlink(tlink);
+	free_xid(xid);
+
+	cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
+	if (rc)
+		return ERR_PTR(rc);
+	return pntsd;
+}
+
+static int
+set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
+		struct inode *inode, const char *path, int aclflag)
+{
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	unsigned int xid;
+	int rc, access_flags = 0;
+	struct cifs_tcon *tcon;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
+	struct cifs_fid fid;
+	struct cifs_open_parms oparms;
+	__le16 *utf16_path;
+
+	cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+
+	tcon = tlink_tcon(tlink);
+	xid = get_xid();
+
+	if (aclflag & CIFS_ACL_OWNER || aclflag & CIFS_ACL_GROUP)
+		access_flags |= WRITE_OWNER;
+	if (aclflag & CIFS_ACL_SACL)
+		access_flags |= SYSTEM_SECURITY;
+	if (aclflag & CIFS_ACL_DACL)
+		access_flags |= WRITE_DAC;
+
+	utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+	if (!utf16_path) {
+		rc = -ENOMEM;
+		free_xid(xid);
+		return rc;
+	}
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.desired_access = access_flags,
+		.create_options = cifs_create_options(cifs_sb, 0),
+		.disposition = FILE_OPEN,
+		.path = path,
+		.fid = &fid,
+	};
+
+	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
+		       NULL, NULL);
+	kfree(utf16_path);
+	if (!rc) {
+		rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
+			    fid.volatile_fid, pnntsd, acllen, aclflag);
+		SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+	}
+
+	cifs_put_tlink(tlink);
+	free_xid(xid);
+	return rc;
+}
+
+/* Retrieve an ACL from the server */
+static struct cifs_ntsd *
+get_smb2_acl(struct cifs_sb_info *cifs_sb,
+	     struct inode *inode, const char *path,
+	     u32 *pacllen, u32 info)
+{
+	struct cifs_ntsd *pntsd = NULL;
+	struct cifsFileInfo *open_file = NULL;
+
+	if (inode && !(info & SACL_SECINFO))
+		open_file = find_readable_file(CIFS_I(inode), true);
+	if (!open_file || (info & SACL_SECINFO))
+		return get_smb2_acl_by_path(cifs_sb, path, pacllen, info);
+
+	pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen, info);
+	cifsFileInfo_put(open_file);
+	return pntsd;
+}
+
+static long smb3_zero_data(struct file *file, struct cifs_tcon *tcon,
+			     loff_t offset, loff_t len, unsigned int xid)
+{
+	struct cifsFileInfo *cfile = file->private_data;
+	struct file_zero_data_information fsctl_buf;
+
+	cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
+
+	fsctl_buf.FileOffset = cpu_to_le64(offset);
+	fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
+
+	return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
+			  cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
+			  (char *)&fsctl_buf,
+			  sizeof(struct file_zero_data_information),
+			  0, NULL, NULL);
+}
+
+static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
+			    loff_t offset, loff_t len, bool keep_size)
+{
+	struct cifs_ses *ses = tcon->ses;
+	struct inode *inode = file_inode(file);
+	struct cifsInodeInfo *cifsi = CIFS_I(inode);
+	struct cifsFileInfo *cfile = file->private_data;
+	unsigned long long new_size;
+	long rc;
+	unsigned int xid;
+	__le64 eof;
+
+	xid = get_xid();
+
+	trace_smb3_zero_enter(xid, cfile->fid.persistent_fid, tcon->tid,
+			      ses->Suid, offset, len);
+
+	inode_lock(inode);
+	filemap_invalidate_lock(inode->i_mapping);
+
+	/*
+	 * We zero the range through ioctl, so we need remove the page caches
+	 * first, otherwise the data may be inconsistent with the server.
+	 */
+	truncate_pagecache_range(inode, offset, offset + len - 1);
+
+	/* if file not oplocked can't be sure whether asking to extend size */
+	rc = -EOPNOTSUPP;
+	if (keep_size == false && !CIFS_CACHE_READ(cifsi))
+		goto zero_range_exit;
+
+	rc = smb3_zero_data(file, tcon, offset, len, xid);
+	if (rc < 0)
+		goto zero_range_exit;
+
+	/*
+	 * do we also need to change the size of the file?
+	 */
+	new_size = offset + len;
+	if (keep_size == false && (unsigned long long)i_size_read(inode) < new_size) {
+		eof = cpu_to_le64(new_size);
+		rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
+				  cfile->fid.volatile_fid, cfile->pid, &eof);
+		if (rc >= 0) {
+			truncate_setsize(inode, new_size);
+			fscache_resize_cookie(cifs_inode_cookie(inode), new_size);
+		}
+	}
+
+ zero_range_exit:
+	filemap_invalidate_unlock(inode->i_mapping);
+	inode_unlock(inode);
+	free_xid(xid);
+	if (rc)
+		trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
+			      ses->Suid, offset, len, rc);
+	else
+		trace_smb3_zero_done(xid, cfile->fid.persistent_fid, tcon->tid,
+			      ses->Suid, offset, len);
+	return rc;
+}
+
+static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
+			    loff_t offset, loff_t len)
+{
+	struct inode *inode = file_inode(file);
+	struct cifsFileInfo *cfile = file->private_data;
+	struct file_zero_data_information fsctl_buf;
+	long rc;
+	unsigned int xid;
+	__u8 set_sparse = 1;
+
+	xid = get_xid();
+
+	inode_lock(inode);
+	/* Need to make file sparse, if not already, before freeing range. */
+	/* Consider adding equivalent for compressed since it could also work */
+	if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
+		rc = -EOPNOTSUPP;
+		goto out;
+	}
+
+	filemap_invalidate_lock(inode->i_mapping);
+	/*
+	 * We implement the punch hole through ioctl, so we need remove the page
+	 * caches first, otherwise the data may be inconsistent with the server.
+	 */
+	truncate_pagecache_range(inode, offset, offset + len - 1);
+
+	cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
+
+	fsctl_buf.FileOffset = cpu_to_le64(offset);
+	fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
+
+	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
+			cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
+			(char *)&fsctl_buf,
+			sizeof(struct file_zero_data_information),
+			CIFSMaxBufSize, NULL, NULL);
+	filemap_invalidate_unlock(inode->i_mapping);
+out:
+	inode_unlock(inode);
+	free_xid(xid);
+	return rc;
+}
+
+static int smb3_simple_fallocate_write_range(unsigned int xid,
+					     struct cifs_tcon *tcon,
+					     struct cifsFileInfo *cfile,
+					     loff_t off, loff_t len,
+					     char *buf)
+{
+	struct cifs_io_parms io_parms = {0};
+	int nbytes;
+	int rc = 0;
+	struct kvec iov[2];
+
+	io_parms.netfid = cfile->fid.netfid;
+	io_parms.pid = current->tgid;
+	io_parms.tcon = tcon;
+	io_parms.persistent_fid = cfile->fid.persistent_fid;
+	io_parms.volatile_fid = cfile->fid.volatile_fid;
+
+	while (len) {
+		io_parms.offset = off;
+		io_parms.length = len;
+		if (io_parms.length > SMB2_MAX_BUFFER_SIZE)
+			io_parms.length = SMB2_MAX_BUFFER_SIZE;
+		/* iov[0] is reserved for smb header */
+		iov[1].iov_base = buf;
+		iov[1].iov_len = io_parms.length;
+		rc = SMB2_write(xid, &io_parms, &nbytes, iov, 1);
+		if (rc)
+			break;
+		if (nbytes > len)
+			return -EINVAL;
+		buf += nbytes;
+		off += nbytes;
+		len -= nbytes;
+	}
+	return rc;
+}
+
+static int smb3_simple_fallocate_range(unsigned int xid,
+				       struct cifs_tcon *tcon,
+				       struct cifsFileInfo *cfile,
+				       loff_t off, loff_t len)
+{
+	struct file_allocated_range_buffer in_data, *out_data = NULL, *tmp_data;
+	u32 out_data_len;
+	char *buf = NULL;
+	loff_t l;
+	int rc;
+
+	in_data.file_offset = cpu_to_le64(off);
+	in_data.length = cpu_to_le64(len);
+	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
+			cfile->fid.volatile_fid,
+			FSCTL_QUERY_ALLOCATED_RANGES,
+			(char *)&in_data, sizeof(in_data),
+			1024 * sizeof(struct file_allocated_range_buffer),
+			(char **)&out_data, &out_data_len);
+	if (rc)
+		goto out;
+
+	buf = kzalloc(1024 * 1024, GFP_KERNEL);
+	if (buf == NULL) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	tmp_data = out_data;
+	while (len) {
+		/*
+		 * The rest of the region is unmapped so write it all.
+		 */
+		if (out_data_len == 0) {
+			rc = smb3_simple_fallocate_write_range(xid, tcon,
+					       cfile, off, len, buf);
+			goto out;
+		}
+
+		if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
+			rc = -EINVAL;
+			goto out;
+		}
+
+		if (off < le64_to_cpu(tmp_data->file_offset)) {
+			/*
+			 * We are at a hole. Write until the end of the region
+			 * or until the next allocated data,
+			 * whichever comes next.
+			 */
+			l = le64_to_cpu(tmp_data->file_offset) - off;
+			if (len < l)
+				l = len;
+			rc = smb3_simple_fallocate_write_range(xid, tcon,
+					       cfile, off, l, buf);
+			if (rc)
+				goto out;
+			off = off + l;
+			len = len - l;
+			if (len == 0)
+				goto out;
+		}
+		/*
+		 * We are at a section of allocated data, just skip forward
+		 * until the end of the data or the end of the region
+		 * we are supposed to fallocate, whichever comes first.
+		 */
+		l = le64_to_cpu(tmp_data->length);
+		if (len < l)
+			l = len;
+		off += l;
+		len -= l;
+
+		tmp_data = &tmp_data[1];
+		out_data_len -= sizeof(struct file_allocated_range_buffer);
+	}
+
+ out:
+	kfree(out_data);
+	kfree(buf);
+	return rc;
+}
+
+
+static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
+			    loff_t off, loff_t len, bool keep_size)
+{
+	struct inode *inode;
+	struct cifsInodeInfo *cifsi;
+	struct cifsFileInfo *cfile = file->private_data;
+	long rc = -EOPNOTSUPP;
+	unsigned int xid;
+	__le64 eof;
+
+	xid = get_xid();
+
+	inode = d_inode(cfile->dentry);
+	cifsi = CIFS_I(inode);
+
+	trace_smb3_falloc_enter(xid, cfile->fid.persistent_fid, tcon->tid,
+				tcon->ses->Suid, off, len);
+	/* if file not oplocked can't be sure whether asking to extend size */
+	if (!CIFS_CACHE_READ(cifsi))
+		if (keep_size == false) {
+			trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
+				tcon->tid, tcon->ses->Suid, off, len, rc);
+			free_xid(xid);
+			return rc;
+		}
+
+	/*
+	 * Extending the file
+	 */
+	if ((keep_size == false) && i_size_read(inode) < off + len) {
+		rc = inode_newsize_ok(inode, off + len);
+		if (rc)
+			goto out;
+
+		if (cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)
+			smb2_set_sparse(xid, tcon, cfile, inode, false);
+
+		eof = cpu_to_le64(off + len);
+		rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
+				  cfile->fid.volatile_fid, cfile->pid, &eof);
+		if (rc == 0) {
+			cifsi->server_eof = off + len;
+			cifs_setsize(inode, off + len);
+			cifs_truncate_page(inode->i_mapping, inode->i_size);
+			truncate_setsize(inode, off + len);
+		}
+		goto out;
+	}
+
+	/*
+	 * Files are non-sparse by default so falloc may be a no-op
+	 * Must check if file sparse. If not sparse, and since we are not
+	 * extending then no need to do anything since file already allocated
+	 */
+	if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
+		rc = 0;
+		goto out;
+	}
+
+	if (keep_size == true) {
+		/*
+		 * We can not preallocate pages beyond the end of the file
+		 * in SMB2
+		 */
+		if (off >= i_size_read(inode)) {
+			rc = 0;
+			goto out;
+		}
+		/*
+		 * For fallocates that are partially beyond the end of file,
+		 * clamp len so we only fallocate up to the end of file.
+		 */
+		if (off + len > i_size_read(inode)) {
+			len = i_size_read(inode) - off;
+		}
+	}
+
+	if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
+		/*
+		 * At this point, we are trying to fallocate an internal
+		 * regions of a sparse file. Since smb2 does not have a
+		 * fallocate command we have two otions on how to emulate this.
+		 * We can either turn the entire file to become non-sparse
+		 * which we only do if the fallocate is for virtually
+		 * the whole file,  or we can overwrite the region with zeroes
+		 * using SMB2_write, which could be prohibitevly expensive
+		 * if len is large.
+		 */
+		/*
+		 * We are only trying to fallocate a small region so
+		 * just write it with zero.
+		 */
+		if (len <= 1024 * 1024) {
+			rc = smb3_simple_fallocate_range(xid, tcon, cfile,
+							 off, len);
+			goto out;
+		}
+
+		/*
+		 * Check if falloc starts within first few pages of file
+		 * and ends within a few pages of the end of file to
+		 * ensure that most of file is being forced to be
+		 * fallocated now. If so then setting whole file sparse
+		 * ie potentially making a few extra pages at the beginning
+		 * or end of the file non-sparse via set_sparse is harmless.
+		 */
+		if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
+			rc = -EOPNOTSUPP;
+			goto out;
+		}
+	}
+
+	smb2_set_sparse(xid, tcon, cfile, inode, false);
+	rc = 0;
+
+out:
+	if (rc)
+		trace_smb3_falloc_err(xid, cfile->fid.persistent_fid, tcon->tid,
+				tcon->ses->Suid, off, len, rc);
+	else
+		trace_smb3_falloc_done(xid, cfile->fid.persistent_fid, tcon->tid,
+				tcon->ses->Suid, off, len);
+
+	free_xid(xid);
+	return rc;
+}
+
+static long smb3_collapse_range(struct file *file, struct cifs_tcon *tcon,
+			    loff_t off, loff_t len)
+{
+	int rc;
+	unsigned int xid;
+	struct inode *inode = file_inode(file);
+	struct cifsFileInfo *cfile = file->private_data;
+	struct cifsInodeInfo *cifsi = CIFS_I(inode);
+	__le64 eof;
+	loff_t old_eof;
+
+	xid = get_xid();
+
+	inode_lock(inode);
+
+	old_eof = i_size_read(inode);
+	if ((off >= old_eof) ||
+	    off + len >= old_eof) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	filemap_invalidate_lock(inode->i_mapping);
+	rc = filemap_write_and_wait_range(inode->i_mapping, off, old_eof - 1);
+	if (rc < 0)
+		goto out_2;
+
+	truncate_pagecache_range(inode, off, old_eof);
+
+	rc = smb2_copychunk_range(xid, cfile, cfile, off + len,
+				  old_eof - off - len, off);
+	if (rc < 0)
+		goto out_2;
+
+	eof = cpu_to_le64(old_eof - len);
+	rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
+			  cfile->fid.volatile_fid, cfile->pid, &eof);
+	if (rc < 0)
+		goto out_2;
+
+	rc = 0;
+
+	cifsi->server_eof = i_size_read(inode) - len;
+	truncate_setsize(inode, cifsi->server_eof);
+	fscache_resize_cookie(cifs_inode_cookie(inode), cifsi->server_eof);
+out_2:
+	filemap_invalidate_unlock(inode->i_mapping);
+ out:
+	inode_unlock(inode);
+	free_xid(xid);
+	return rc;
+}
+
+static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon,
+			      loff_t off, loff_t len)
+{
+	int rc;
+	unsigned int xid;
+	struct cifsFileInfo *cfile = file->private_data;
+	struct inode *inode = file_inode(file);
+	__le64 eof;
+	__u64  count, old_eof;
+
+	xid = get_xid();
+
+	inode_lock(inode);
+
+	old_eof = i_size_read(inode);
+	if (off >= old_eof) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	count = old_eof - off;
+	eof = cpu_to_le64(old_eof + len);
+
+	filemap_invalidate_lock(inode->i_mapping);
+	rc = filemap_write_and_wait_range(inode->i_mapping, off, old_eof + len - 1);
+	if (rc < 0)
+		goto out_2;
+	truncate_pagecache_range(inode, off, old_eof);
+
+	rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
+			  cfile->fid.volatile_fid, cfile->pid, &eof);
+	if (rc < 0)
+		goto out_2;
+
+	truncate_setsize(inode, old_eof + len);
+	fscache_resize_cookie(cifs_inode_cookie(inode), i_size_read(inode));
+
+	rc = smb2_copychunk_range(xid, cfile, cfile, off, count, off + len);
+	if (rc < 0)
+		goto out_2;
+
+	rc = smb3_zero_data(file, tcon, off, len, xid);
+	if (rc < 0)
+		goto out_2;
+
+	rc = 0;
+out_2:
+	filemap_invalidate_unlock(inode->i_mapping);
+ out:
+	inode_unlock(inode);
+	free_xid(xid);
+	return rc;
+}
+
+static loff_t smb3_llseek(struct file *file, struct cifs_tcon *tcon, loff_t offset, int whence)
+{
+	struct cifsFileInfo *wrcfile, *cfile = file->private_data;
+	struct cifsInodeInfo *cifsi;
+	struct inode *inode;
+	int rc = 0;
+	struct file_allocated_range_buffer in_data, *out_data = NULL;
+	u32 out_data_len;
+	unsigned int xid;
+
+	if (whence != SEEK_HOLE && whence != SEEK_DATA)
+		return generic_file_llseek(file, offset, whence);
+
+	inode = d_inode(cfile->dentry);
+	cifsi = CIFS_I(inode);
+
+	if (offset < 0 || offset >= i_size_read(inode))
+		return -ENXIO;
+
+	xid = get_xid();
+	/*
+	 * We need to be sure that all dirty pages are written as they
+	 * might fill holes on the server.
+	 * Note that we also MUST flush any written pages since at least
+	 * some servers (Windows2016) will not reflect recent writes in
+	 * QUERY_ALLOCATED_RANGES until SMB2_flush is called.
+	 */
+	wrcfile = find_writable_file(cifsi, FIND_WR_ANY);
+	if (wrcfile) {
+		filemap_write_and_wait(inode->i_mapping);
+		smb2_flush_file(xid, tcon, &wrcfile->fid);
+		cifsFileInfo_put(wrcfile);
+	}
+
+	if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)) {
+		if (whence == SEEK_HOLE)
+			offset = i_size_read(inode);
+		goto lseek_exit;
+	}
+
+	in_data.file_offset = cpu_to_le64(offset);
+	in_data.length = cpu_to_le64(i_size_read(inode));
+
+	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
+			cfile->fid.volatile_fid,
+			FSCTL_QUERY_ALLOCATED_RANGES,
+			(char *)&in_data, sizeof(in_data),
+			sizeof(struct file_allocated_range_buffer),
+			(char **)&out_data, &out_data_len);
+	if (rc == -E2BIG)
+		rc = 0;
+	if (rc)
+		goto lseek_exit;
+
+	if (whence == SEEK_HOLE && out_data_len == 0)
+		goto lseek_exit;
+
+	if (whence == SEEK_DATA && out_data_len == 0) {
+		rc = -ENXIO;
+		goto lseek_exit;
+	}
+
+	if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
+		rc = -EINVAL;
+		goto lseek_exit;
+	}
+	if (whence == SEEK_DATA) {
+		offset = le64_to_cpu(out_data->file_offset);
+		goto lseek_exit;
+	}
+	if (offset < le64_to_cpu(out_data->file_offset))
+		goto lseek_exit;
+
+	offset = le64_to_cpu(out_data->file_offset) + le64_to_cpu(out_data->length);
+
+ lseek_exit:
+	free_xid(xid);
+	kfree(out_data);
+	if (!rc)
+		return vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
+	else
+		return rc;
+}
+
+static int smb3_fiemap(struct cifs_tcon *tcon,
+		       struct cifsFileInfo *cfile,
+		       struct fiemap_extent_info *fei, u64 start, u64 len)
+{
+	unsigned int xid;
+	struct file_allocated_range_buffer in_data, *out_data;
+	u32 out_data_len;
+	int i, num, rc, flags, last_blob;
+	u64 next;
+
+	rc = fiemap_prep(d_inode(cfile->dentry), fei, start, &len, 0);
+	if (rc)
+		return rc;
+
+	xid = get_xid();
+ again:
+	in_data.file_offset = cpu_to_le64(start);
+	in_data.length = cpu_to_le64(len);
+
+	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
+			cfile->fid.volatile_fid,
+			FSCTL_QUERY_ALLOCATED_RANGES,
+			(char *)&in_data, sizeof(in_data),
+			1024 * sizeof(struct file_allocated_range_buffer),
+			(char **)&out_data, &out_data_len);
+	if (rc == -E2BIG) {
+		last_blob = 0;
+		rc = 0;
+	} else
+		last_blob = 1;
+	if (rc)
+		goto out;
+
+	if (out_data_len && out_data_len < sizeof(struct file_allocated_range_buffer)) {
+		rc = -EINVAL;
+		goto out;
+	}
+	if (out_data_len % sizeof(struct file_allocated_range_buffer)) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	num = out_data_len / sizeof(struct file_allocated_range_buffer);
+	for (i = 0; i < num; i++) {
+		flags = 0;
+		if (i == num - 1 && last_blob)
+			flags |= FIEMAP_EXTENT_LAST;
+
+		rc = fiemap_fill_next_extent(fei,
+				le64_to_cpu(out_data[i].file_offset),
+				le64_to_cpu(out_data[i].file_offset),
+				le64_to_cpu(out_data[i].length),
+				flags);
+		if (rc < 0)
+			goto out;
+		if (rc == 1) {
+			rc = 0;
+			goto out;
+		}
+	}
+
+	if (!last_blob) {
+		next = le64_to_cpu(out_data[num - 1].file_offset) +
+		  le64_to_cpu(out_data[num - 1].length);
+		len = len - (next - start);
+		start = next;
+		goto again;
+	}
+
+ out:
+	free_xid(xid);
+	kfree(out_data);
+	return rc;
+}
+
+static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
+			   loff_t off, loff_t len)
+{
+	/* KEEP_SIZE already checked for by do_fallocate */
+	if (mode & FALLOC_FL_PUNCH_HOLE)
+		return smb3_punch_hole(file, tcon, off, len);
+	else if (mode & FALLOC_FL_ZERO_RANGE) {
+		if (mode & FALLOC_FL_KEEP_SIZE)
+			return smb3_zero_range(file, tcon, off, len, true);
+		return smb3_zero_range(file, tcon, off, len, false);
+	} else if (mode == FALLOC_FL_KEEP_SIZE)
+		return smb3_simple_falloc(file, tcon, off, len, true);
+	else if (mode == FALLOC_FL_COLLAPSE_RANGE)
+		return smb3_collapse_range(file, tcon, off, len);
+	else if (mode == FALLOC_FL_INSERT_RANGE)
+		return smb3_insert_range(file, tcon, off, len);
+	else if (mode == 0)
+		return smb3_simple_falloc(file, tcon, off, len, false);
+
+	return -EOPNOTSUPP;
+}
+
+static void
+smb2_downgrade_oplock(struct TCP_Server_Info *server,
+		      struct cifsInodeInfo *cinode, __u32 oplock,
+		      unsigned int epoch, bool *purge_cache)
+{
+	server->ops->set_oplock_level(cinode, oplock, 0, NULL);
+}
+
+static void
+smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
+		       unsigned int epoch, bool *purge_cache);
+
+static void
+smb3_downgrade_oplock(struct TCP_Server_Info *server,
+		       struct cifsInodeInfo *cinode, __u32 oplock,
+		       unsigned int epoch, bool *purge_cache)
+{
+	unsigned int old_state = cinode->oplock;
+	unsigned int old_epoch = cinode->epoch;
+	unsigned int new_state;
+
+	if (epoch > old_epoch) {
+		smb21_set_oplock_level(cinode, oplock, 0, NULL);
+		cinode->epoch = epoch;
+	}
+
+	new_state = cinode->oplock;
+	*purge_cache = false;
+
+	if ((old_state & CIFS_CACHE_READ_FLG) != 0 &&
+	    (new_state & CIFS_CACHE_READ_FLG) == 0)
+		*purge_cache = true;
+	else if (old_state == new_state && (epoch - old_epoch > 1))
+		*purge_cache = true;
+}
+
+static void
+smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
+		      unsigned int epoch, bool *purge_cache)
+{
+	oplock &= 0xFF;
+	cinode->lease_granted = false;
+	if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
+		return;
+	if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
+		cinode->oplock = CIFS_CACHE_RHW_FLG;
+		cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
+			 &cinode->netfs.inode);
+	} else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
+		cinode->oplock = CIFS_CACHE_RW_FLG;
+		cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
+			 &cinode->netfs.inode);
+	} else if (oplock == SMB2_OPLOCK_LEVEL_II) {
+		cinode->oplock = CIFS_CACHE_READ_FLG;
+		cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
+			 &cinode->netfs.inode);
+	} else
+		cinode->oplock = 0;
+}
+
+static void
+smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
+		       unsigned int epoch, bool *purge_cache)
+{
+	char message[5] = {0};
+	unsigned int new_oplock = 0;
+
+	oplock &= 0xFF;
+	cinode->lease_granted = true;
+	if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
+		return;
+
+	/* Check if the server granted an oplock rather than a lease */
+	if (oplock & SMB2_OPLOCK_LEVEL_EXCLUSIVE)
+		return smb2_set_oplock_level(cinode, oplock, epoch,
+					     purge_cache);
+
+	if (oplock & SMB2_LEASE_READ_CACHING_HE) {
+		new_oplock |= CIFS_CACHE_READ_FLG;
+		strcat(message, "R");
+	}
+	if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
+		new_oplock |= CIFS_CACHE_HANDLE_FLG;
+		strcat(message, "H");
+	}
+	if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
+		new_oplock |= CIFS_CACHE_WRITE_FLG;
+		strcat(message, "W");
+	}
+	if (!new_oplock)
+		strncpy(message, "None", sizeof(message));
+
+	cinode->oplock = new_oplock;
+	cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
+		 &cinode->netfs.inode);
+}
+
+static void
+smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
+		      unsigned int epoch, bool *purge_cache)
+{
+	unsigned int old_oplock = cinode->oplock;
+
+	smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
+
+	if (purge_cache) {
+		*purge_cache = false;
+		if (old_oplock == CIFS_CACHE_READ_FLG) {
+			if (cinode->oplock == CIFS_CACHE_READ_FLG &&
+			    (epoch - cinode->epoch > 0))
+				*purge_cache = true;
+			else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
+				 (epoch - cinode->epoch > 1))
+				*purge_cache = true;
+			else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
+				 (epoch - cinode->epoch > 1))
+				*purge_cache = true;
+			else if (cinode->oplock == 0 &&
+				 (epoch - cinode->epoch > 0))
+				*purge_cache = true;
+		} else if (old_oplock == CIFS_CACHE_RH_FLG) {
+			if (cinode->oplock == CIFS_CACHE_RH_FLG &&
+			    (epoch - cinode->epoch > 0))
+				*purge_cache = true;
+			else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
+				 (epoch - cinode->epoch > 1))
+				*purge_cache = true;
+		}
+		cinode->epoch = epoch;
+	}
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+static bool
+smb2_is_read_op(__u32 oplock)
+{
+	return oplock == SMB2_OPLOCK_LEVEL_II;
+}
+#endif /* CIFS_ALLOW_INSECURE_LEGACY */
+
+static bool
+smb21_is_read_op(__u32 oplock)
+{
+	return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
+	       !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
+}
+
+static __le32
+map_oplock_to_lease(u8 oplock)
+{
+	if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
+		return SMB2_LEASE_WRITE_CACHING_LE | SMB2_LEASE_READ_CACHING_LE;
+	else if (oplock == SMB2_OPLOCK_LEVEL_II)
+		return SMB2_LEASE_READ_CACHING_LE;
+	else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
+		return SMB2_LEASE_HANDLE_CACHING_LE | SMB2_LEASE_READ_CACHING_LE |
+		       SMB2_LEASE_WRITE_CACHING_LE;
+	return 0;
+}
+
+static char *
+smb2_create_lease_buf(u8 *lease_key, u8 oplock)
+{
+	struct create_lease *buf;
+
+	buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
+	if (!buf)
+		return NULL;
+
+	memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
+	buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
+
+	buf->ccontext.DataOffset = cpu_to_le16(offsetof
+					(struct create_lease, lcontext));
+	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
+	buf->ccontext.NameOffset = cpu_to_le16(offsetof
+				(struct create_lease, Name));
+	buf->ccontext.NameLength = cpu_to_le16(4);
+	/* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
+	buf->Name[0] = 'R';
+	buf->Name[1] = 'q';
+	buf->Name[2] = 'L';
+	buf->Name[3] = 's';
+	return (char *)buf;
+}
+
+static char *
+smb3_create_lease_buf(u8 *lease_key, u8 oplock)
+{
+	struct create_lease_v2 *buf;
+
+	buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
+	if (!buf)
+		return NULL;
+
+	memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
+	buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
+
+	buf->ccontext.DataOffset = cpu_to_le16(offsetof
+					(struct create_lease_v2, lcontext));
+	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
+	buf->ccontext.NameOffset = cpu_to_le16(offsetof
+				(struct create_lease_v2, Name));
+	buf->ccontext.NameLength = cpu_to_le16(4);
+	/* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
+	buf->Name[0] = 'R';
+	buf->Name[1] = 'q';
+	buf->Name[2] = 'L';
+	buf->Name[3] = 's';
+	return (char *)buf;
+}
+
+static __u8
+smb2_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
+{
+	struct create_lease *lc = (struct create_lease *)buf;
+
+	*epoch = 0; /* not used */
+	if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE)
+		return SMB2_OPLOCK_LEVEL_NOCHANGE;
+	return le32_to_cpu(lc->lcontext.LeaseState);
+}
+
+static __u8
+smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
+{
+	struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
+
+	*epoch = le16_to_cpu(lc->lcontext.Epoch);
+	if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE)
+		return SMB2_OPLOCK_LEVEL_NOCHANGE;
+	if (lease_key)
+		memcpy(lease_key, &lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
+	return le32_to_cpu(lc->lcontext.LeaseState);
+}
+
+static unsigned int
+smb2_wp_retry_size(struct inode *inode)
+{
+	return min_t(unsigned int, CIFS_SB(inode->i_sb)->ctx->wsize,
+		     SMB2_MAX_BUFFER_SIZE);
+}
+
+static bool
+smb2_dir_needs_close(struct cifsFileInfo *cfile)
+{
+	return !cfile->invalidHandle;
+}
+
+static void
+fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
+		   struct smb_rqst *old_rq, __le16 cipher_type)
+{
+	struct smb2_hdr *shdr =
+			(struct smb2_hdr *)old_rq->rq_iov[0].iov_base;
+
+	memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
+	tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
+	tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
+	tr_hdr->Flags = cpu_to_le16(0x01);
+	if ((cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
+	    (cipher_type == SMB2_ENCRYPTION_AES256_GCM))
+		get_random_bytes(&tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
+	else
+		get_random_bytes(&tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
+	memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
+}
+
+static void *smb2_aead_req_alloc(struct crypto_aead *tfm, const struct smb_rqst *rqst,
+				 int num_rqst, const u8 *sig, u8 **iv,
+				 struct aead_request **req, struct scatterlist **sgl,
+				 unsigned int *num_sgs)
+{
+	unsigned int req_size = sizeof(**req) + crypto_aead_reqsize(tfm);
+	unsigned int iv_size = crypto_aead_ivsize(tfm);
+	unsigned int len;
+	u8 *p;
+
+	*num_sgs = cifs_get_num_sgs(rqst, num_rqst, sig);
+
+	len = iv_size;
+	len += crypto_aead_alignmask(tfm) & ~(crypto_tfm_ctx_alignment() - 1);
+	len = ALIGN(len, crypto_tfm_ctx_alignment());
+	len += req_size;
+	len = ALIGN(len, __alignof__(struct scatterlist));
+	len += *num_sgs * sizeof(**sgl);
+
+	p = kmalloc(len, GFP_ATOMIC);
+	if (!p)
+		return NULL;
+
+	*iv = (u8 *)PTR_ALIGN(p, crypto_aead_alignmask(tfm) + 1);
+	*req = (struct aead_request *)PTR_ALIGN(*iv + iv_size,
+						crypto_tfm_ctx_alignment());
+	*sgl = (struct scatterlist *)PTR_ALIGN((u8 *)*req + req_size,
+					       __alignof__(struct scatterlist));
+	return p;
+}
+
+static void *smb2_get_aead_req(struct crypto_aead *tfm, const struct smb_rqst *rqst,
+			       int num_rqst, const u8 *sig, u8 **iv,
+			       struct aead_request **req, struct scatterlist **sgl)
+{
+	unsigned int off, len, skip;
+	struct scatterlist *sg;
+	unsigned int num_sgs;
+	unsigned long addr;
+	int i, j;
+	void *p;
+
+	p = smb2_aead_req_alloc(tfm, rqst, num_rqst, sig, iv, req, sgl, &num_sgs);
+	if (!p)
+		return NULL;
+
+	sg_init_table(*sgl, num_sgs);
+	sg = *sgl;
+
+	/* Assumes the first rqst has a transform header as the first iov.
+	 * I.e.
+	 * rqst[0].rq_iov[0]  is transform header
+	 * rqst[0].rq_iov[1+] data to be encrypted/decrypted
+	 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
+	 */
+	for (i = 0; i < num_rqst; i++) {
+		/*
+		 * The first rqst has a transform header where the
+		 * first 20 bytes are not part of the encrypted blob.
+		 */
+		for (j = 0; j < rqst[i].rq_nvec; j++) {
+			struct kvec *iov = &rqst[i].rq_iov[j];
+
+			skip = (i == 0) && (j == 0) ? 20 : 0;
+			addr = (unsigned long)iov->iov_base + skip;
+			len = iov->iov_len - skip;
+			sg = cifs_sg_set_buf(sg, (void *)addr, len);
+		}
+		for (j = 0; j < rqst[i].rq_npages; j++) {
+			rqst_page_get_length(&rqst[i], j, &len, &off);
+			sg_set_page(sg++, rqst[i].rq_pages[j], len, off);
+		}
+	}
+	cifs_sg_set_buf(sg, sig, SMB2_SIGNATURE_SIZE);
+
+	return p;
+}
+
+static int
+smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
+{
+	struct TCP_Server_Info *pserver;
+	struct cifs_ses *ses;
+	u8 *ses_enc_key;
+
+	/* If server is a channel, select the primary channel */
+	pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
+
+	spin_lock(&cifs_tcp_ses_lock);
+	list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
+		if (ses->Suid == ses_id) {
+			spin_lock(&ses->ses_lock);
+			ses_enc_key = enc ? ses->smb3encryptionkey :
+				ses->smb3decryptionkey;
+			memcpy(key, ses_enc_key, SMB3_ENC_DEC_KEY_SIZE);
+			spin_unlock(&ses->ses_lock);
+			spin_unlock(&cifs_tcp_ses_lock);
+			return 0;
+		}
+	}
+	spin_unlock(&cifs_tcp_ses_lock);
+
+	return -EAGAIN;
+}
+/*
+ * Encrypt or decrypt @rqst message. @rqst[0] has the following format:
+ * iov[0]   - transform header (associate data),
+ * iov[1-N] - SMB2 header and pages - data to encrypt.
+ * On success return encrypted data in iov[1-N] and pages, leave iov[0]
+ * untouched.
+ */
+static int
+crypt_message(struct TCP_Server_Info *server, int num_rqst,
+	      struct smb_rqst *rqst, int enc)
+{
+	struct smb2_transform_hdr *tr_hdr =
+		(struct smb2_transform_hdr *)rqst[0].rq_iov[0].iov_base;
+	unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
+	int rc = 0;
+	struct scatterlist *sg;
+	u8 sign[SMB2_SIGNATURE_SIZE] = {};
+	u8 key[SMB3_ENC_DEC_KEY_SIZE];
+	struct aead_request *req;
+	u8 *iv;
+	DECLARE_CRYPTO_WAIT(wait);
+	struct crypto_aead *tfm;
+	unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
+	void *creq;
+
+	rc = smb2_get_enc_key(server, le64_to_cpu(tr_hdr->SessionId), enc, key);
+	if (rc) {
+		cifs_server_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
+			 enc ? "en" : "de");
+		return rc;
+	}
+
+	rc = smb3_crypto_aead_allocate(server);
+	if (rc) {
+		cifs_server_dbg(VFS, "%s: crypto alloc failed\n", __func__);
+		return rc;
+	}
+
+	tfm = enc ? server->secmech.enc : server->secmech.dec;
+
+	if ((server->cipher_type == SMB2_ENCRYPTION_AES256_CCM) ||
+		(server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
+		rc = crypto_aead_setkey(tfm, key, SMB3_GCM256_CRYPTKEY_SIZE);
+	else
+		rc = crypto_aead_setkey(tfm, key, SMB3_GCM128_CRYPTKEY_SIZE);
+
+	if (rc) {
+		cifs_server_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
+		return rc;
+	}
+
+	rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
+	if (rc) {
+		cifs_server_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
+		return rc;
+	}
+
+	creq = smb2_get_aead_req(tfm, rqst, num_rqst, sign, &iv, &req, &sg);
+	if (unlikely(!creq))
+		return -ENOMEM;
+
+	if (!enc) {
+		memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
+		crypt_len += SMB2_SIGNATURE_SIZE;
+	}
+
+	if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
+	    (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
+		memcpy(iv, (char *)tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
+	else {
+		iv[0] = 3;
+		memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
+	}
+
+	aead_request_set_tfm(req, tfm);
+	aead_request_set_crypt(req, sg, sg, crypt_len, iv);
+	aead_request_set_ad(req, assoc_data_len);
+
+	aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+				  crypto_req_done, &wait);
+
+	rc = crypto_wait_req(enc ? crypto_aead_encrypt(req)
+				: crypto_aead_decrypt(req), &wait);
+
+	if (!rc && enc)
+		memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
+
+	kfree_sensitive(creq);
+	return rc;
+}
+
+void
+smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
+{
+	int i, j;
+
+	for (i = 0; i < num_rqst; i++) {
+		if (rqst[i].rq_pages) {
+			for (j = rqst[i].rq_npages - 1; j >= 0; j--)
+				put_page(rqst[i].rq_pages[j]);
+			kfree(rqst[i].rq_pages);
+		}
+	}
+}
+
+/*
+ * This function will initialize new_rq and encrypt the content.
+ * The first entry, new_rq[0], only contains a single iov which contains
+ * a smb2_transform_hdr and is pre-allocated by the caller.
+ * This function then populates new_rq[1+] with the content from olq_rq[0+].
+ *
+ * The end result is an array of smb_rqst structures where the first structure
+ * only contains a single iov for the transform header which we then can pass
+ * to crypt_message().
+ *
+ * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
+ * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
+ */
+static int
+smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
+		       struct smb_rqst *new_rq, struct smb_rqst *old_rq)
+{
+	struct page **pages;
+	struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
+	unsigned int npages;
+	unsigned int orig_len = 0;
+	int i, j;
+	int rc = -ENOMEM;
+
+	for (i = 1; i < num_rqst; i++) {
+		npages = old_rq[i - 1].rq_npages;
+		pages = kmalloc_array(npages, sizeof(struct page *),
+				      GFP_KERNEL);
+		if (!pages)
+			goto err_free;
+
+		new_rq[i].rq_pages = pages;
+		new_rq[i].rq_npages = npages;
+		new_rq[i].rq_offset = old_rq[i - 1].rq_offset;
+		new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz;
+		new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz;
+		new_rq[i].rq_iov = old_rq[i - 1].rq_iov;
+		new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec;
+
+		orig_len += smb_rqst_len(server, &old_rq[i - 1]);
+
+		for (j = 0; j < npages; j++) {
+			pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
+			if (!pages[j])
+				goto err_free;
+		}
+
+		/* copy pages form the old */
+		for (j = 0; j < npages; j++) {
+			char *dst, *src;
+			unsigned int offset, len;
+
+			rqst_page_get_length(&new_rq[i], j, &len, &offset);
+
+			dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset;
+			src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset;
+
+			memcpy(dst, src, len);
+			kunmap(new_rq[i].rq_pages[j]);
+			kunmap(old_rq[i - 1].rq_pages[j]);
+		}
+	}
+
+	/* fill the 1st iov with a transform header */
+	fill_transform_hdr(tr_hdr, orig_len, old_rq, server->cipher_type);
+
+	rc = crypt_message(server, num_rqst, new_rq, 1);
+	cifs_dbg(FYI, "Encrypt message returned %d\n", rc);
+	if (rc)
+		goto err_free;
+
+	return rc;
+
+err_free:
+	smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
+	return rc;
+}
+
+static int
+smb3_is_transform_hdr(void *buf)
+{
+	struct smb2_transform_hdr *trhdr = buf;
+
+	return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
+}
+
+static int
+decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
+		 unsigned int buf_data_size, struct page **pages,
+		 unsigned int npages, unsigned int page_data_size,
+		 bool is_offloaded)
+{
+	struct kvec iov[2];
+	struct smb_rqst rqst = {NULL};
+	int rc;
+
+	iov[0].iov_base = buf;
+	iov[0].iov_len = sizeof(struct smb2_transform_hdr);
+	iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
+	iov[1].iov_len = buf_data_size;
+
+	rqst.rq_iov = iov;
+	rqst.rq_nvec = 2;
+	rqst.rq_pages = pages;
+	rqst.rq_npages = npages;
+	rqst.rq_pagesz = PAGE_SIZE;
+	rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
+
+	rc = crypt_message(server, 1, &rqst, 0);
+	cifs_dbg(FYI, "Decrypt message returned %d\n", rc);
+
+	if (rc)
+		return rc;
+
+	memmove(buf, iov[1].iov_base, buf_data_size);
+
+	if (!is_offloaded)
+		server->total_read = buf_data_size + page_data_size;
+
+	return rc;
+}
+
+static int
+read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
+		     unsigned int npages, unsigned int len)
+{
+	int i;
+	int length;
+
+	for (i = 0; i < npages; i++) {
+		struct page *page = pages[i];
+		size_t n;
+
+		n = len;
+		if (len >= PAGE_SIZE) {
+			/* enough data to fill the page */
+			n = PAGE_SIZE;
+			len -= n;
+		} else {
+			zero_user(page, len, PAGE_SIZE - len);
+			len = 0;
+		}
+		length = cifs_read_page_from_socket(server, page, 0, n);
+		if (length < 0)
+			return length;
+		server->total_read += length;
+	}
+
+	return 0;
+}
+
+static int
+init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
+	       unsigned int cur_off, struct bio_vec **page_vec)
+{
+	struct bio_vec *bvec;
+	int i;
+
+	bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
+	if (!bvec)
+		return -ENOMEM;
+
+	for (i = 0; i < npages; i++) {
+		bvec[i].bv_page = pages[i];
+		bvec[i].bv_offset = (i == 0) ? cur_off : 0;
+		bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
+		data_size -= bvec[i].bv_len;
+	}
+
+	if (data_size != 0) {
+		cifs_dbg(VFS, "%s: something went wrong\n", __func__);
+		kfree(bvec);
+		return -EIO;
+	}
+
+	*page_vec = bvec;
+	return 0;
+}
+
+static int
+handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
+		 char *buf, unsigned int buf_len, struct page **pages,
+		 unsigned int npages, unsigned int page_data_size,
+		 bool is_offloaded)
+{
+	unsigned int data_offset;
+	unsigned int data_len;
+	unsigned int cur_off;
+	unsigned int cur_page_idx;
+	unsigned int pad_len;
+	struct cifs_readdata *rdata = mid->callback_data;
+	struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
+	struct bio_vec *bvec = NULL;
+	struct iov_iter iter;
+	struct kvec iov;
+	int length;
+	bool use_rdma_mr = false;
+
+	if (shdr->Command != SMB2_READ) {
+		cifs_server_dbg(VFS, "only big read responses are supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (server->ops->is_session_expired &&
+	    server->ops->is_session_expired(buf)) {
+		if (!is_offloaded)
+			cifs_reconnect(server, true);
+		return -1;
+	}
+
+	if (server->ops->is_status_pending &&
+			server->ops->is_status_pending(buf, server))
+		return -1;
+
+	/* set up first two iov to get credits */
+	rdata->iov[0].iov_base = buf;
+	rdata->iov[0].iov_len = 0;
+	rdata->iov[1].iov_base = buf;
+	rdata->iov[1].iov_len =
+		min_t(unsigned int, buf_len, server->vals->read_rsp_size);
+	cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
+		 rdata->iov[0].iov_base, rdata->iov[0].iov_len);
+	cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
+		 rdata->iov[1].iov_base, rdata->iov[1].iov_len);
+
+	rdata->result = server->ops->map_error(buf, true);
+	if (rdata->result != 0) {
+		cifs_dbg(FYI, "%s: server returned error %d\n",
+			 __func__, rdata->result);
+		/* normal error on read response */
+		if (is_offloaded)
+			mid->mid_state = MID_RESPONSE_RECEIVED;
+		else
+			dequeue_mid(mid, false);
+		return 0;
+	}
+
+	data_offset = server->ops->read_data_offset(buf);
+#ifdef CONFIG_CIFS_SMB_DIRECT
+	use_rdma_mr = rdata->mr;
+#endif
+	data_len = server->ops->read_data_length(buf, use_rdma_mr);
+
+	if (data_offset < server->vals->read_rsp_size) {
+		/*
+		 * win2k8 sometimes sends an offset of 0 when the read
+		 * is beyond the EOF. Treat it as if the data starts just after
+		 * the header.
+		 */
+		cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
+			 __func__, data_offset);
+		data_offset = server->vals->read_rsp_size;
+	} else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
+		/* data_offset is beyond the end of smallbuf */
+		cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
+			 __func__, data_offset);
+		rdata->result = -EIO;
+		if (is_offloaded)
+			mid->mid_state = MID_RESPONSE_MALFORMED;
+		else
+			dequeue_mid(mid, rdata->result);
+		return 0;
+	}
+
+	pad_len = data_offset - server->vals->read_rsp_size;
+
+	if (buf_len <= data_offset) {
+		/* read response payload is in pages */
+		cur_page_idx = pad_len / PAGE_SIZE;
+		cur_off = pad_len % PAGE_SIZE;
+
+		if (cur_page_idx != 0) {
+			/* data offset is beyond the 1st page of response */
+			cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
+				 __func__, data_offset);
+			rdata->result = -EIO;
+			if (is_offloaded)
+				mid->mid_state = MID_RESPONSE_MALFORMED;
+			else
+				dequeue_mid(mid, rdata->result);
+			return 0;
+		}
+
+		if (data_len > page_data_size - pad_len) {
+			/* data_len is corrupt -- discard frame */
+			rdata->result = -EIO;
+			if (is_offloaded)
+				mid->mid_state = MID_RESPONSE_MALFORMED;
+			else
+				dequeue_mid(mid, rdata->result);
+			return 0;
+		}
+
+		rdata->result = init_read_bvec(pages, npages, page_data_size,
+					       cur_off, &bvec);
+		if (rdata->result != 0) {
+			if (is_offloaded)
+				mid->mid_state = MID_RESPONSE_MALFORMED;
+			else
+				dequeue_mid(mid, rdata->result);
+			return 0;
+		}
+
+		iov_iter_bvec(&iter, ITER_SOURCE, bvec, npages, data_len);
+	} else if (buf_len >= data_offset + data_len) {
+		/* read response payload is in buf */
+		WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
+		iov.iov_base = buf + data_offset;
+		iov.iov_len = data_len;
+		iov_iter_kvec(&iter, ITER_SOURCE, &iov, 1, data_len);
+	} else {
+		/* read response payload cannot be in both buf and pages */
+		WARN_ONCE(1, "buf can not contain only a part of read data");
+		rdata->result = -EIO;
+		if (is_offloaded)
+			mid->mid_state = MID_RESPONSE_MALFORMED;
+		else
+			dequeue_mid(mid, rdata->result);
+		return 0;
+	}
+
+	length = rdata->copy_into_pages(server, rdata, &iter);
+
+	kfree(bvec);
+
+	if (length < 0)
+		return length;
+
+	if (is_offloaded)
+		mid->mid_state = MID_RESPONSE_RECEIVED;
+	else
+		dequeue_mid(mid, false);
+	return length;
+}
+
+struct smb2_decrypt_work {
+	struct work_struct decrypt;
+	struct TCP_Server_Info *server;
+	struct page **ppages;
+	char *buf;
+	unsigned int npages;
+	unsigned int len;
+};
+
+
+static void smb2_decrypt_offload(struct work_struct *work)
+{
+	struct smb2_decrypt_work *dw = container_of(work,
+				struct smb2_decrypt_work, decrypt);
+	int i, rc;
+	struct mid_q_entry *mid;
+
+	rc = decrypt_raw_data(dw->server, dw->buf, dw->server->vals->read_rsp_size,
+			      dw->ppages, dw->npages, dw->len, true);
+	if (rc) {
+		cifs_dbg(VFS, "error decrypting rc=%d\n", rc);
+		goto free_pages;
+	}
+
+	dw->server->lstrp = jiffies;
+	mid = smb2_find_dequeue_mid(dw->server, dw->buf);
+	if (mid == NULL)
+		cifs_dbg(FYI, "mid not found\n");
+	else {
+		mid->decrypted = true;
+		rc = handle_read_data(dw->server, mid, dw->buf,
+				      dw->server->vals->read_rsp_size,
+				      dw->ppages, dw->npages, dw->len,
+				      true);
+		if (rc >= 0) {
+#ifdef CONFIG_CIFS_STATS2
+			mid->when_received = jiffies;
+#endif
+			if (dw->server->ops->is_network_name_deleted)
+				dw->server->ops->is_network_name_deleted(dw->buf,
+									 dw->server);
+
+			mid->callback(mid);
+		} else {
+			spin_lock(&dw->server->srv_lock);
+			if (dw->server->tcpStatus == CifsNeedReconnect) {
+				spin_lock(&dw->server->mid_lock);
+				mid->mid_state = MID_RETRY_NEEDED;
+				spin_unlock(&dw->server->mid_lock);
+				spin_unlock(&dw->server->srv_lock);
+				mid->callback(mid);
+			} else {
+				spin_lock(&dw->server->mid_lock);
+				mid->mid_state = MID_REQUEST_SUBMITTED;
+				mid->mid_flags &= ~(MID_DELETED);
+				list_add_tail(&mid->qhead,
+					&dw->server->pending_mid_q);
+				spin_unlock(&dw->server->mid_lock);
+				spin_unlock(&dw->server->srv_lock);
+			}
+		}
+		release_mid(mid);
+	}
+
+free_pages:
+	for (i = dw->npages-1; i >= 0; i--)
+		put_page(dw->ppages[i]);
+
+	kfree(dw->ppages);
+	cifs_small_buf_release(dw->buf);
+	kfree(dw);
+}
+
+
+static int
+receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid,
+		       int *num_mids)
+{
+	char *buf = server->smallbuf;
+	struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
+	unsigned int npages;
+	struct page **pages;
+	unsigned int len;
+	unsigned int buflen = server->pdu_size;
+	int rc;
+	int i = 0;
+	struct smb2_decrypt_work *dw;
+
+	*num_mids = 1;
+	len = min_t(unsigned int, buflen, server->vals->read_rsp_size +
+		sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
+
+	rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
+	if (rc < 0)
+		return rc;
+	server->total_read += rc;
+
+	len = le32_to_cpu(tr_hdr->OriginalMessageSize) -
+		server->vals->read_rsp_size;
+	npages = DIV_ROUND_UP(len, PAGE_SIZE);
+
+	pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
+	if (!pages) {
+		rc = -ENOMEM;
+		goto discard_data;
+	}
+
+	for (; i < npages; i++) {
+		pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
+		if (!pages[i]) {
+			rc = -ENOMEM;
+			goto discard_data;
+		}
+	}
+
+	/* read read data into pages */
+	rc = read_data_into_pages(server, pages, npages, len);
+	if (rc)
+		goto free_pages;
+
+	rc = cifs_discard_remaining_data(server);
+	if (rc)
+		goto free_pages;
+
+	/*
+	 * For large reads, offload to different thread for better performance,
+	 * use more cores decrypting which can be expensive
+	 */
+
+	if ((server->min_offload) && (server->in_flight > 1) &&
+	    (server->pdu_size >= server->min_offload)) {
+		dw = kmalloc(sizeof(struct smb2_decrypt_work), GFP_KERNEL);
+		if (dw == NULL)
+			goto non_offloaded_decrypt;
+
+		dw->buf = server->smallbuf;
+		server->smallbuf = (char *)cifs_small_buf_get();
+
+		INIT_WORK(&dw->decrypt, smb2_decrypt_offload);
+
+		dw->npages = npages;
+		dw->server = server;
+		dw->ppages = pages;
+		dw->len = len;
+		queue_work(decrypt_wq, &dw->decrypt);
+		*num_mids = 0; /* worker thread takes care of finding mid */
+		return -1;
+	}
+
+non_offloaded_decrypt:
+	rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size,
+			      pages, npages, len, false);
+	if (rc)
+		goto free_pages;
+
+	*mid = smb2_find_mid(server, buf);
+	if (*mid == NULL)
+		cifs_dbg(FYI, "mid not found\n");
+	else {
+		cifs_dbg(FYI, "mid found\n");
+		(*mid)->decrypted = true;
+		rc = handle_read_data(server, *mid, buf,
+				      server->vals->read_rsp_size,
+				      pages, npages, len, false);
+		if (rc >= 0) {
+			if (server->ops->is_network_name_deleted) {
+				server->ops->is_network_name_deleted(buf,
+								server);
+			}
+		}
+	}
+
+free_pages:
+	for (i = i - 1; i >= 0; i--)
+		put_page(pages[i]);
+	kfree(pages);
+	return rc;
+discard_data:
+	cifs_discard_remaining_data(server);
+	goto free_pages;
+}
+
+static int
+receive_encrypted_standard(struct TCP_Server_Info *server,
+			   struct mid_q_entry **mids, char **bufs,
+			   int *num_mids)
+{
+	int ret, length;
+	char *buf = server->smallbuf;
+	struct smb2_hdr *shdr;
+	unsigned int pdu_length = server->pdu_size;
+	unsigned int buf_size;
+	unsigned int next_cmd;
+	struct mid_q_entry *mid_entry;
+	int next_is_large;
+	char *next_buffer = NULL;
+
+	*num_mids = 0;
+
+	/* switch to large buffer if too big for a small one */
+	if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE) {
+		server->large_buf = true;
+		memcpy(server->bigbuf, buf, server->total_read);
+		buf = server->bigbuf;
+	}
+
+	/* now read the rest */
+	length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
+				pdu_length - HEADER_SIZE(server) + 1);
+	if (length < 0)
+		return length;
+	server->total_read += length;
+
+	buf_size = pdu_length - sizeof(struct smb2_transform_hdr);
+	length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0, false);
+	if (length)
+		return length;
+
+	next_is_large = server->large_buf;
+one_more:
+	shdr = (struct smb2_hdr *)buf;
+	next_cmd = le32_to_cpu(shdr->NextCommand);
+	if (next_cmd) {
+		if (WARN_ON_ONCE(next_cmd > pdu_length))
+			return -1;
+		if (next_is_large)
+			next_buffer = (char *)cifs_buf_get();
+		else
+			next_buffer = (char *)cifs_small_buf_get();
+		memcpy(next_buffer, buf + next_cmd, pdu_length - next_cmd);
+	}
+
+	mid_entry = smb2_find_mid(server, buf);
+	if (mid_entry == NULL)
+		cifs_dbg(FYI, "mid not found\n");
+	else {
+		cifs_dbg(FYI, "mid found\n");
+		mid_entry->decrypted = true;
+		mid_entry->resp_buf_size = server->pdu_size;
+	}
+
+	if (*num_mids >= MAX_COMPOUND) {
+		cifs_server_dbg(VFS, "too many PDUs in compound\n");
+		return -1;
+	}
+	bufs[*num_mids] = buf;
+	mids[(*num_mids)++] = mid_entry;
+
+	if (mid_entry && mid_entry->handle)
+		ret = mid_entry->handle(server, mid_entry);
+	else
+		ret = cifs_handle_standard(server, mid_entry);
+
+	if (ret == 0 && next_cmd) {
+		pdu_length -= next_cmd;
+		server->large_buf = next_is_large;
+		if (next_is_large)
+			server->bigbuf = buf = next_buffer;
+		else
+			server->smallbuf = buf = next_buffer;
+		goto one_more;
+	} else if (ret != 0) {
+		/*
+		 * ret != 0 here means that we didn't get to handle_mid() thus
+		 * server->smallbuf and server->bigbuf are still valid. We need
+		 * to free next_buffer because it is not going to be used
+		 * anywhere.
+		 */
+		if (next_is_large)
+			free_rsp_buf(CIFS_LARGE_BUFFER, next_buffer);
+		else
+			free_rsp_buf(CIFS_SMALL_BUFFER, next_buffer);
+	}
+
+	return ret;
+}
+
+static int
+smb3_receive_transform(struct TCP_Server_Info *server,
+		       struct mid_q_entry **mids, char **bufs, int *num_mids)
+{
+	char *buf = server->smallbuf;
+	unsigned int pdu_length = server->pdu_size;
+	struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
+	unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
+
+	if (pdu_length < sizeof(struct smb2_transform_hdr) +
+						sizeof(struct smb2_hdr)) {
+		cifs_server_dbg(VFS, "Transform message is too small (%u)\n",
+			 pdu_length);
+		cifs_reconnect(server, true);
+		return -ECONNABORTED;
+	}
+
+	if (pdu_length < orig_len + sizeof(struct smb2_transform_hdr)) {
+		cifs_server_dbg(VFS, "Transform message is broken\n");
+		cifs_reconnect(server, true);
+		return -ECONNABORTED;
+	}
+
+	/* TODO: add support for compounds containing READ. */
+	if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) {
+		return receive_encrypted_read(server, &mids[0], num_mids);
+	}
+
+	return receive_encrypted_standard(server, mids, bufs, num_mids);
+}
+
+int
+smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
+{
+	char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
+
+	return handle_read_data(server, mid, buf, server->pdu_size,
+				NULL, 0, 0, false);
+}
+
+static int smb2_next_header(struct TCP_Server_Info *server, char *buf,
+			    unsigned int *noff)
+{
+	struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
+	struct smb2_transform_hdr *t_hdr = (struct smb2_transform_hdr *)buf;
+
+	if (hdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
+		*noff = le32_to_cpu(t_hdr->OriginalMessageSize);
+		if (unlikely(check_add_overflow(*noff, sizeof(*t_hdr), noff)))
+			return -EINVAL;
+	} else {
+		*noff = le32_to_cpu(hdr->NextCommand);
+	}
+	if (unlikely(*noff && *noff < MID_HEADER_SIZE(server)))
+		return -EINVAL;
+	return 0;
+}
+
+static int
+smb2_make_node(unsigned int xid, struct inode *inode,
+	       struct dentry *dentry, struct cifs_tcon *tcon,
+	       const char *full_path, umode_t mode, dev_t dev)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	int rc = -EPERM;
+	struct cifs_open_info_data buf = {};
+	struct cifs_io_parms io_parms = {0};
+	__u32 oplock = 0;
+	struct cifs_fid fid;
+	struct cifs_open_parms oparms;
+	unsigned int bytes_written;
+	struct win_dev *pdev;
+	struct kvec iov[2];
+
+	/*
+	 * Check if mounted with mount parm 'sfu' mount parm.
+	 * SFU emulation should work with all servers, but only
+	 * supports block and char device (no socket & fifo),
+	 * and was used by default in earlier versions of Windows
+	 */
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
+		return rc;
+
+	/*
+	 * TODO: Add ability to create instead via reparse point. Windows (e.g.
+	 * their current NFS server) uses this approach to expose special files
+	 * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions
+	 */
+
+	if (!S_ISCHR(mode) && !S_ISBLK(mode) && !S_ISFIFO(mode))
+		return rc;
+
+	cifs_dbg(FYI, "sfu compat create special file\n");
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.cifs_sb = cifs_sb,
+		.desired_access = GENERIC_WRITE,
+		.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
+						      CREATE_OPTION_SPECIAL),
+		.disposition = FILE_CREATE,
+		.path = full_path,
+		.fid = &fid,
+	};
+
+	if (tcon->ses->server->oplocks)
+		oplock = REQ_OPLOCK;
+	else
+		oplock = 0;
+	rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, &buf);
+	if (rc)
+		return rc;
+
+	/*
+	 * BB Do not bother to decode buf since no local inode yet to put
+	 * timestamps in, but we can reuse it safely.
+	 */
+
+	pdev = (struct win_dev *)&buf.fi;
+	io_parms.pid = current->tgid;
+	io_parms.tcon = tcon;
+	io_parms.offset = 0;
+	io_parms.length = sizeof(struct win_dev);
+	iov[1].iov_base = &buf.fi;
+	iov[1].iov_len = sizeof(struct win_dev);
+	if (S_ISCHR(mode)) {
+		memcpy(pdev->type, "IntxCHR", 8);
+		pdev->major = cpu_to_le64(MAJOR(dev));
+		pdev->minor = cpu_to_le64(MINOR(dev));
+		rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
+							&bytes_written, iov, 1);
+	} else if (S_ISBLK(mode)) {
+		memcpy(pdev->type, "IntxBLK", 8);
+		pdev->major = cpu_to_le64(MAJOR(dev));
+		pdev->minor = cpu_to_le64(MINOR(dev));
+		rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
+							&bytes_written, iov, 1);
+	} else if (S_ISFIFO(mode)) {
+		memcpy(pdev->type, "LnxFIFO", 8);
+		pdev->major = 0;
+		pdev->minor = 0;
+		rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
+							&bytes_written, iov, 1);
+	}
+	tcon->ses->server->ops->close(xid, tcon, &fid);
+	d_drop(dentry);
+
+	/* FIXME: add code here to set EAs */
+
+	cifs_free_open_info(&buf);
+	return rc;
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+struct smb_version_operations smb20_operations = {
+	.compare_fids = smb2_compare_fids,
+	.setup_request = smb2_setup_request,
+	.setup_async_request = smb2_setup_async_request,
+	.check_receive = smb2_check_receive,
+	.add_credits = smb2_add_credits,
+	.set_credits = smb2_set_credits,
+	.get_credits_field = smb2_get_credits_field,
+	.get_credits = smb2_get_credits,
+	.wait_mtu_credits = cifs_wait_mtu_credits,
+	.get_next_mid = smb2_get_next_mid,
+	.revert_current_mid = smb2_revert_current_mid,
+	.read_data_offset = smb2_read_data_offset,
+	.read_data_length = smb2_read_data_length,
+	.map_error = map_smb2_to_linux_error,
+	.find_mid = smb2_find_mid,
+	.check_message = smb2_check_message,
+	.dump_detail = smb2_dump_detail,
+	.clear_stats = smb2_clear_stats,
+	.print_stats = smb2_print_stats,
+	.is_oplock_break = smb2_is_valid_oplock_break,
+	.handle_cancelled_mid = smb2_handle_cancelled_mid,
+	.downgrade_oplock = smb2_downgrade_oplock,
+	.need_neg = smb2_need_neg,
+	.negotiate = smb2_negotiate,
+	.negotiate_wsize = smb2_negotiate_wsize,
+	.negotiate_rsize = smb2_negotiate_rsize,
+	.sess_setup = SMB2_sess_setup,
+	.logoff = SMB2_logoff,
+	.tree_connect = SMB2_tcon,
+	.tree_disconnect = SMB2_tdis,
+	.qfs_tcon = smb2_qfs_tcon,
+	.is_path_accessible = smb2_is_path_accessible,
+	.can_echo = smb2_can_echo,
+	.echo = SMB2_echo,
+	.query_path_info = smb2_query_path_info,
+	.get_srv_inum = smb2_get_srv_inum,
+	.query_file_info = smb2_query_file_info,
+	.set_path_size = smb2_set_path_size,
+	.set_file_size = smb2_set_file_size,
+	.set_file_info = smb2_set_file_info,
+	.set_compression = smb2_set_compression,
+	.mkdir = smb2_mkdir,
+	.mkdir_setinfo = smb2_mkdir_setinfo,
+	.rmdir = smb2_rmdir,
+	.unlink = smb2_unlink,
+	.rename = smb2_rename_path,
+	.create_hardlink = smb2_create_hardlink,
+	.query_symlink = smb2_query_symlink,
+	.query_mf_symlink = smb3_query_mf_symlink,
+	.create_mf_symlink = smb3_create_mf_symlink,
+	.open = smb2_open_file,
+	.set_fid = smb2_set_fid,
+	.close = smb2_close_file,
+	.flush = smb2_flush_file,
+	.async_readv = smb2_async_readv,
+	.async_writev = smb2_async_writev,
+	.sync_read = smb2_sync_read,
+	.sync_write = smb2_sync_write,
+	.query_dir_first = smb2_query_dir_first,
+	.query_dir_next = smb2_query_dir_next,
+	.close_dir = smb2_close_dir,
+	.calc_smb_size = smb2_calc_size,
+	.is_status_pending = smb2_is_status_pending,
+	.is_session_expired = smb2_is_session_expired,
+	.oplock_response = smb2_oplock_response,
+	.queryfs = smb2_queryfs,
+	.mand_lock = smb2_mand_lock,
+	.mand_unlock_range = smb2_unlock_range,
+	.push_mand_locks = smb2_push_mandatory_locks,
+	.get_lease_key = smb2_get_lease_key,
+	.set_lease_key = smb2_set_lease_key,
+	.new_lease_key = smb2_new_lease_key,
+	.calc_signature = smb2_calc_signature,
+	.is_read_op = smb2_is_read_op,
+	.set_oplock_level = smb2_set_oplock_level,
+	.create_lease_buf = smb2_create_lease_buf,
+	.parse_lease_buf = smb2_parse_lease_buf,
+	.copychunk_range = smb2_copychunk_range,
+	.wp_retry_size = smb2_wp_retry_size,
+	.dir_needs_close = smb2_dir_needs_close,
+	.get_dfs_refer = smb2_get_dfs_refer,
+	.select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_XATTR
+	.query_all_EAs = smb2_query_eas,
+	.set_EA = smb2_set_ea,
+#endif /* CIFS_XATTR */
+	.get_acl = get_smb2_acl,
+	.get_acl_by_fid = get_smb2_acl_by_fid,
+	.set_acl = set_smb2_acl,
+	.next_header = smb2_next_header,
+	.ioctl_query_info = smb2_ioctl_query_info,
+	.make_node = smb2_make_node,
+	.fiemap = smb3_fiemap,
+	.llseek = smb3_llseek,
+	.is_status_io_timeout = smb2_is_status_io_timeout,
+	.is_network_name_deleted = smb2_is_network_name_deleted,
+};
+#endif /* CIFS_ALLOW_INSECURE_LEGACY */
+
+struct smb_version_operations smb21_operations = {
+	.compare_fids = smb2_compare_fids,
+	.setup_request = smb2_setup_request,
+	.setup_async_request = smb2_setup_async_request,
+	.check_receive = smb2_check_receive,
+	.add_credits = smb2_add_credits,
+	.set_credits = smb2_set_credits,
+	.get_credits_field = smb2_get_credits_field,
+	.get_credits = smb2_get_credits,
+	.wait_mtu_credits = smb2_wait_mtu_credits,
+	.adjust_credits = smb2_adjust_credits,
+	.get_next_mid = smb2_get_next_mid,
+	.revert_current_mid = smb2_revert_current_mid,
+	.read_data_offset = smb2_read_data_offset,
+	.read_data_length = smb2_read_data_length,
+	.map_error = map_smb2_to_linux_error,
+	.find_mid = smb2_find_mid,
+	.check_message = smb2_check_message,
+	.dump_detail = smb2_dump_detail,
+	.clear_stats = smb2_clear_stats,
+	.print_stats = smb2_print_stats,
+	.is_oplock_break = smb2_is_valid_oplock_break,
+	.handle_cancelled_mid = smb2_handle_cancelled_mid,
+	.downgrade_oplock = smb2_downgrade_oplock,
+	.need_neg = smb2_need_neg,
+	.negotiate = smb2_negotiate,
+	.negotiate_wsize = smb2_negotiate_wsize,
+	.negotiate_rsize = smb2_negotiate_rsize,
+	.sess_setup = SMB2_sess_setup,
+	.logoff = SMB2_logoff,
+	.tree_connect = SMB2_tcon,
+	.tree_disconnect = SMB2_tdis,
+	.qfs_tcon = smb2_qfs_tcon,
+	.is_path_accessible = smb2_is_path_accessible,
+	.can_echo = smb2_can_echo,
+	.echo = SMB2_echo,
+	.query_path_info = smb2_query_path_info,
+	.get_srv_inum = smb2_get_srv_inum,
+	.query_file_info = smb2_query_file_info,
+	.set_path_size = smb2_set_path_size,
+	.set_file_size = smb2_set_file_size,
+	.set_file_info = smb2_set_file_info,
+	.set_compression = smb2_set_compression,
+	.mkdir = smb2_mkdir,
+	.mkdir_setinfo = smb2_mkdir_setinfo,
+	.rmdir = smb2_rmdir,
+	.unlink = smb2_unlink,
+	.rename = smb2_rename_path,
+	.create_hardlink = smb2_create_hardlink,
+	.query_symlink = smb2_query_symlink,
+	.query_mf_symlink = smb3_query_mf_symlink,
+	.create_mf_symlink = smb3_create_mf_symlink,
+	.open = smb2_open_file,
+	.set_fid = smb2_set_fid,
+	.close = smb2_close_file,
+	.flush = smb2_flush_file,
+	.async_readv = smb2_async_readv,
+	.async_writev = smb2_async_writev,
+	.sync_read = smb2_sync_read,
+	.sync_write = smb2_sync_write,
+	.query_dir_first = smb2_query_dir_first,
+	.query_dir_next = smb2_query_dir_next,
+	.close_dir = smb2_close_dir,
+	.calc_smb_size = smb2_calc_size,
+	.is_status_pending = smb2_is_status_pending,
+	.is_session_expired = smb2_is_session_expired,
+	.oplock_response = smb2_oplock_response,
+	.queryfs = smb2_queryfs,
+	.mand_lock = smb2_mand_lock,
+	.mand_unlock_range = smb2_unlock_range,
+	.push_mand_locks = smb2_push_mandatory_locks,
+	.get_lease_key = smb2_get_lease_key,
+	.set_lease_key = smb2_set_lease_key,
+	.new_lease_key = smb2_new_lease_key,
+	.calc_signature = smb2_calc_signature,
+	.is_read_op = smb21_is_read_op,
+	.set_oplock_level = smb21_set_oplock_level,
+	.create_lease_buf = smb2_create_lease_buf,
+	.parse_lease_buf = smb2_parse_lease_buf,
+	.copychunk_range = smb2_copychunk_range,
+	.wp_retry_size = smb2_wp_retry_size,
+	.dir_needs_close = smb2_dir_needs_close,
+	.enum_snapshots = smb3_enum_snapshots,
+	.notify = smb3_notify,
+	.get_dfs_refer = smb2_get_dfs_refer,
+	.select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_XATTR
+	.query_all_EAs = smb2_query_eas,
+	.set_EA = smb2_set_ea,
+#endif /* CIFS_XATTR */
+	.get_acl = get_smb2_acl,
+	.get_acl_by_fid = get_smb2_acl_by_fid,
+	.set_acl = set_smb2_acl,
+	.next_header = smb2_next_header,
+	.ioctl_query_info = smb2_ioctl_query_info,
+	.make_node = smb2_make_node,
+	.fiemap = smb3_fiemap,
+	.llseek = smb3_llseek,
+	.is_status_io_timeout = smb2_is_status_io_timeout,
+	.is_network_name_deleted = smb2_is_network_name_deleted,
+};
+
+struct smb_version_operations smb30_operations = {
+	.compare_fids = smb2_compare_fids,
+	.setup_request = smb2_setup_request,
+	.setup_async_request = smb2_setup_async_request,
+	.check_receive = smb2_check_receive,
+	.add_credits = smb2_add_credits,
+	.set_credits = smb2_set_credits,
+	.get_credits_field = smb2_get_credits_field,
+	.get_credits = smb2_get_credits,
+	.wait_mtu_credits = smb2_wait_mtu_credits,
+	.adjust_credits = smb2_adjust_credits,
+	.get_next_mid = smb2_get_next_mid,
+	.revert_current_mid = smb2_revert_current_mid,
+	.read_data_offset = smb2_read_data_offset,
+	.read_data_length = smb2_read_data_length,
+	.map_error = map_smb2_to_linux_error,
+	.find_mid = smb2_find_mid,
+	.check_message = smb2_check_message,
+	.dump_detail = smb2_dump_detail,
+	.clear_stats = smb2_clear_stats,
+	.print_stats = smb2_print_stats,
+	.dump_share_caps = smb2_dump_share_caps,
+	.is_oplock_break = smb2_is_valid_oplock_break,
+	.handle_cancelled_mid = smb2_handle_cancelled_mid,
+	.downgrade_oplock = smb3_downgrade_oplock,
+	.need_neg = smb2_need_neg,
+	.negotiate = smb2_negotiate,
+	.negotiate_wsize = smb3_negotiate_wsize,
+	.negotiate_rsize = smb3_negotiate_rsize,
+	.sess_setup = SMB2_sess_setup,
+	.logoff = SMB2_logoff,
+	.tree_connect = SMB2_tcon,
+	.tree_disconnect = SMB2_tdis,
+	.qfs_tcon = smb3_qfs_tcon,
+	.is_path_accessible = smb2_is_path_accessible,
+	.can_echo = smb2_can_echo,
+	.echo = SMB2_echo,
+	.query_path_info = smb2_query_path_info,
+	/* WSL tags introduced long after smb2.1, enable for SMB3, 3.11 only */
+	.query_reparse_tag = smb2_query_reparse_tag,
+	.get_srv_inum = smb2_get_srv_inum,
+	.query_file_info = smb2_query_file_info,
+	.set_path_size = smb2_set_path_size,
+	.set_file_size = smb2_set_file_size,
+	.set_file_info = smb2_set_file_info,
+	.set_compression = smb2_set_compression,
+	.mkdir = smb2_mkdir,
+	.mkdir_setinfo = smb2_mkdir_setinfo,
+	.rmdir = smb2_rmdir,
+	.unlink = smb2_unlink,
+	.rename = smb2_rename_path,
+	.create_hardlink = smb2_create_hardlink,
+	.query_symlink = smb2_query_symlink,
+	.query_mf_symlink = smb3_query_mf_symlink,
+	.create_mf_symlink = smb3_create_mf_symlink,
+	.open = smb2_open_file,
+	.set_fid = smb2_set_fid,
+	.close = smb2_close_file,
+	.close_getattr = smb2_close_getattr,
+	.flush = smb2_flush_file,
+	.async_readv = smb2_async_readv,
+	.async_writev = smb2_async_writev,
+	.sync_read = smb2_sync_read,
+	.sync_write = smb2_sync_write,
+	.query_dir_first = smb2_query_dir_first,
+	.query_dir_next = smb2_query_dir_next,
+	.close_dir = smb2_close_dir,
+	.calc_smb_size = smb2_calc_size,
+	.is_status_pending = smb2_is_status_pending,
+	.is_session_expired = smb2_is_session_expired,
+	.oplock_response = smb2_oplock_response,
+	.queryfs = smb2_queryfs,
+	.mand_lock = smb2_mand_lock,
+	.mand_unlock_range = smb2_unlock_range,
+	.push_mand_locks = smb2_push_mandatory_locks,
+	.get_lease_key = smb2_get_lease_key,
+	.set_lease_key = smb2_set_lease_key,
+	.new_lease_key = smb2_new_lease_key,
+	.generate_signingkey = generate_smb30signingkey,
+	.calc_signature = smb3_calc_signature,
+	.set_integrity  = smb3_set_integrity,
+	.is_read_op = smb21_is_read_op,
+	.set_oplock_level = smb3_set_oplock_level,
+	.create_lease_buf = smb3_create_lease_buf,
+	.parse_lease_buf = smb3_parse_lease_buf,
+	.copychunk_range = smb2_copychunk_range,
+	.duplicate_extents = smb2_duplicate_extents,
+	.validate_negotiate = smb3_validate_negotiate,
+	.wp_retry_size = smb2_wp_retry_size,
+	.dir_needs_close = smb2_dir_needs_close,
+	.fallocate = smb3_fallocate,
+	.enum_snapshots = smb3_enum_snapshots,
+	.notify = smb3_notify,
+	.init_transform_rq = smb3_init_transform_rq,
+	.is_transform_hdr = smb3_is_transform_hdr,
+	.receive_transform = smb3_receive_transform,
+	.get_dfs_refer = smb2_get_dfs_refer,
+	.select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_XATTR
+	.query_all_EAs = smb2_query_eas,
+	.set_EA = smb2_set_ea,
+#endif /* CIFS_XATTR */
+	.get_acl = get_smb2_acl,
+	.get_acl_by_fid = get_smb2_acl_by_fid,
+	.set_acl = set_smb2_acl,
+	.next_header = smb2_next_header,
+	.ioctl_query_info = smb2_ioctl_query_info,
+	.make_node = smb2_make_node,
+	.fiemap = smb3_fiemap,
+	.llseek = smb3_llseek,
+	.is_status_io_timeout = smb2_is_status_io_timeout,
+	.is_network_name_deleted = smb2_is_network_name_deleted,
+};
+
+struct smb_version_operations smb311_operations = {
+	.compare_fids = smb2_compare_fids,
+	.setup_request = smb2_setup_request,
+	.setup_async_request = smb2_setup_async_request,
+	.check_receive = smb2_check_receive,
+	.add_credits = smb2_add_credits,
+	.set_credits = smb2_set_credits,
+	.get_credits_field = smb2_get_credits_field,
+	.get_credits = smb2_get_credits,
+	.wait_mtu_credits = smb2_wait_mtu_credits,
+	.adjust_credits = smb2_adjust_credits,
+	.get_next_mid = smb2_get_next_mid,
+	.revert_current_mid = smb2_revert_current_mid,
+	.read_data_offset = smb2_read_data_offset,
+	.read_data_length = smb2_read_data_length,
+	.map_error = map_smb2_to_linux_error,
+	.find_mid = smb2_find_mid,
+	.check_message = smb2_check_message,
+	.dump_detail = smb2_dump_detail,
+	.clear_stats = smb2_clear_stats,
+	.print_stats = smb2_print_stats,
+	.dump_share_caps = smb2_dump_share_caps,
+	.is_oplock_break = smb2_is_valid_oplock_break,
+	.handle_cancelled_mid = smb2_handle_cancelled_mid,
+	.downgrade_oplock = smb3_downgrade_oplock,
+	.need_neg = smb2_need_neg,
+	.negotiate = smb2_negotiate,
+	.negotiate_wsize = smb3_negotiate_wsize,
+	.negotiate_rsize = smb3_negotiate_rsize,
+	.sess_setup = SMB2_sess_setup,
+	.logoff = SMB2_logoff,
+	.tree_connect = SMB2_tcon,
+	.tree_disconnect = SMB2_tdis,
+	.qfs_tcon = smb3_qfs_tcon,
+	.is_path_accessible = smb2_is_path_accessible,
+	.can_echo = smb2_can_echo,
+	.echo = SMB2_echo,
+	.query_path_info = smb2_query_path_info,
+	.query_reparse_tag = smb2_query_reparse_tag,
+	.get_srv_inum = smb2_get_srv_inum,
+	.query_file_info = smb2_query_file_info,
+	.set_path_size = smb2_set_path_size,
+	.set_file_size = smb2_set_file_size,
+	.set_file_info = smb2_set_file_info,
+	.set_compression = smb2_set_compression,
+	.mkdir = smb2_mkdir,
+	.mkdir_setinfo = smb2_mkdir_setinfo,
+	.posix_mkdir = smb311_posix_mkdir,
+	.rmdir = smb2_rmdir,
+	.unlink = smb2_unlink,
+	.rename = smb2_rename_path,
+	.create_hardlink = smb2_create_hardlink,
+	.query_symlink = smb2_query_symlink,
+	.query_mf_symlink = smb3_query_mf_symlink,
+	.create_mf_symlink = smb3_create_mf_symlink,
+	.open = smb2_open_file,
+	.set_fid = smb2_set_fid,
+	.close = smb2_close_file,
+	.close_getattr = smb2_close_getattr,
+	.flush = smb2_flush_file,
+	.async_readv = smb2_async_readv,
+	.async_writev = smb2_async_writev,
+	.sync_read = smb2_sync_read,
+	.sync_write = smb2_sync_write,
+	.query_dir_first = smb2_query_dir_first,
+	.query_dir_next = smb2_query_dir_next,
+	.close_dir = smb2_close_dir,
+	.calc_smb_size = smb2_calc_size,
+	.is_status_pending = smb2_is_status_pending,
+	.is_session_expired = smb2_is_session_expired,
+	.oplock_response = smb2_oplock_response,
+	.queryfs = smb311_queryfs,
+	.mand_lock = smb2_mand_lock,
+	.mand_unlock_range = smb2_unlock_range,
+	.push_mand_locks = smb2_push_mandatory_locks,
+	.get_lease_key = smb2_get_lease_key,
+	.set_lease_key = smb2_set_lease_key,
+	.new_lease_key = smb2_new_lease_key,
+	.generate_signingkey = generate_smb311signingkey,
+	.calc_signature = smb3_calc_signature,
+	.set_integrity  = smb3_set_integrity,
+	.is_read_op = smb21_is_read_op,
+	.set_oplock_level = smb3_set_oplock_level,
+	.create_lease_buf = smb3_create_lease_buf,
+	.parse_lease_buf = smb3_parse_lease_buf,
+	.copychunk_range = smb2_copychunk_range,
+	.duplicate_extents = smb2_duplicate_extents,
+/*	.validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
+	.wp_retry_size = smb2_wp_retry_size,
+	.dir_needs_close = smb2_dir_needs_close,
+	.fallocate = smb3_fallocate,
+	.enum_snapshots = smb3_enum_snapshots,
+	.notify = smb3_notify,
+	.init_transform_rq = smb3_init_transform_rq,
+	.is_transform_hdr = smb3_is_transform_hdr,
+	.receive_transform = smb3_receive_transform,
+	.get_dfs_refer = smb2_get_dfs_refer,
+	.select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_XATTR
+	.query_all_EAs = smb2_query_eas,
+	.set_EA = smb2_set_ea,
+#endif /* CIFS_XATTR */
+	.get_acl = get_smb2_acl,
+	.get_acl_by_fid = get_smb2_acl_by_fid,
+	.set_acl = set_smb2_acl,
+	.next_header = smb2_next_header,
+	.ioctl_query_info = smb2_ioctl_query_info,
+	.make_node = smb2_make_node,
+	.fiemap = smb3_fiemap,
+	.llseek = smb3_llseek,
+	.is_status_io_timeout = smb2_is_status_io_timeout,
+	.is_network_name_deleted = smb2_is_network_name_deleted,
+};
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+struct smb_version_values smb20_values = {
+	.version_string = SMB20_VERSION_STRING,
+	.protocol_id = SMB20_PROT_ID,
+	.req_capabilities = 0, /* MBZ */
+	.large_lock_type = 0,
+	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.header_preamble_size = 0,
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp),
+	.lock_cmd = SMB2_LOCK,
+	.cap_unix = 0,
+	.cap_nt_find = SMB2_NT_FIND,
+	.cap_large_files = SMB2_LARGE_FILES,
+	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.create_lease_size = sizeof(struct create_lease),
+};
+#endif /* ALLOW_INSECURE_LEGACY */
+
+struct smb_version_values smb21_values = {
+	.version_string = SMB21_VERSION_STRING,
+	.protocol_id = SMB21_PROT_ID,
+	.req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
+	.large_lock_type = 0,
+	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.header_preamble_size = 0,
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp),
+	.lock_cmd = SMB2_LOCK,
+	.cap_unix = 0,
+	.cap_nt_find = SMB2_NT_FIND,
+	.cap_large_files = SMB2_LARGE_FILES,
+	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.create_lease_size = sizeof(struct create_lease),
+};
+
+struct smb_version_values smb3any_values = {
+	.version_string = SMB3ANY_VERSION_STRING,
+	.protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
+	.req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
+	.large_lock_type = 0,
+	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.header_preamble_size = 0,
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp),
+	.lock_cmd = SMB2_LOCK,
+	.cap_unix = 0,
+	.cap_nt_find = SMB2_NT_FIND,
+	.cap_large_files = SMB2_LARGE_FILES,
+	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.create_lease_size = sizeof(struct create_lease_v2),
+};
+
+struct smb_version_values smbdefault_values = {
+	.version_string = SMBDEFAULT_VERSION_STRING,
+	.protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
+	.req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
+	.large_lock_type = 0,
+	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.header_preamble_size = 0,
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp),
+	.lock_cmd = SMB2_LOCK,
+	.cap_unix = 0,
+	.cap_nt_find = SMB2_NT_FIND,
+	.cap_large_files = SMB2_LARGE_FILES,
+	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.create_lease_size = sizeof(struct create_lease_v2),
+};
+
+struct smb_version_values smb30_values = {
+	.version_string = SMB30_VERSION_STRING,
+	.protocol_id = SMB30_PROT_ID,
+	.req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
+	.large_lock_type = 0,
+	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.header_preamble_size = 0,
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp),
+	.lock_cmd = SMB2_LOCK,
+	.cap_unix = 0,
+	.cap_nt_find = SMB2_NT_FIND,
+	.cap_large_files = SMB2_LARGE_FILES,
+	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.create_lease_size = sizeof(struct create_lease_v2),
+};
+
+struct smb_version_values smb302_values = {
+	.version_string = SMB302_VERSION_STRING,
+	.protocol_id = SMB302_PROT_ID,
+	.req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
+	.large_lock_type = 0,
+	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.header_preamble_size = 0,
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp),
+	.lock_cmd = SMB2_LOCK,
+	.cap_unix = 0,
+	.cap_nt_find = SMB2_NT_FIND,
+	.cap_large_files = SMB2_LARGE_FILES,
+	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.create_lease_size = sizeof(struct create_lease_v2),
+};
+
+struct smb_version_values smb311_values = {
+	.version_string = SMB311_VERSION_STRING,
+	.protocol_id = SMB311_PROT_ID,
+	.req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
+	.large_lock_type = 0,
+	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.header_preamble_size = 0,
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp),
+	.lock_cmd = SMB2_LOCK,
+	.cap_unix = 0,
+	.cap_nt_find = SMB2_NT_FIND,
+	.cap_large_files = SMB2_LARGE_FILES,
+	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
+	.create_lease_size = sizeof(struct create_lease_v2),
+};