Initial import

1 files changed, 1716 insertions, 0 deletions

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
new file mode 100644
index 000000000..54daee5ad
--- /dev/null
+++ b/fs/cifs/smb2ops.c
@@ -0,0 +1,1716 @@
+/*
+ *  SMB2 version specific operations
+ *
+ *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
+ *
+ *  This library is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License v2 as published
+ *  by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ *  the GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/pagemap.h>
+#include <linux/vfs.h>
+#include <linux/falloc.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"
+
+static int
+change_conf(struct TCP_Server_Info *server)
+{
+	server->credits += server->echo_credits + server->oplock_credits;
+	server->oplock_credits = server->echo_credits = 0;
+	switch (server->credits) {
+	case 0:
+		return -1;
+	case 1:
+		server->echoes = false;
+		server->oplocks = false;
+		cifs_dbg(VFS, "disabling echoes and oplocks\n");
+		break;
+	case 2:
+		server->echoes = true;
+		server->oplocks = false;
+		server->echo_credits = 1;
+		cifs_dbg(FYI, "disabling oplocks\n");
+		break;
+	default:
+		server->echoes = true;
+		server->oplocks = true;
+		server->echo_credits = 1;
+		server->oplock_credits = 1;
+	}
+	server->credits -= server->echo_credits + server->oplock_credits;
+	return 0;
+}
+
+static void
+smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
+		 const int optype)
+{
+	int *val, rc = 0;
+	spin_lock(&server->req_lock);
+	val = server->ops->get_credits_field(server, optype);
+	*val += add;
+	server->in_flight--;
+	if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_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++;
+		}
+	}
+	spin_unlock(&server->req_lock);
+	wake_up(&server->request_q);
+	if (rc)
+		cifs_reconnect(server);
+}
+
+static void
+smb2_set_credits(struct TCP_Server_Info *server, const int val)
+{
+	spin_lock(&server->req_lock);
+	server->credits = val;
+	spin_unlock(&server->req_lock);
+}
+
+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 le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
+}
+
+static int
+smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
+		      unsigned int *num, unsigned int *credits)
+{
+	int rc = 0;
+	unsigned int scredits;
+
+	spin_lock(&server->req_lock);
+	while (1) {
+		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));
+			cifs_num_waiters_dec(server);
+			if (rc)
+				return rc;
+			spin_lock(&server->req_lock);
+		} else {
+			if (server->tcpStatus == CifsExiting) {
+				spin_unlock(&server->req_lock);
+				return -ENOENT;
+			}
+
+			scredits = server->credits;
+			/* can deadlock with reopen */
+			if (scredits == 1) {
+				*num = SMB2_MAX_BUFFER_SIZE;
+				*credits = 0;
+				break;
+			}
+
+			/* leave one credit for a possible reopen */
+			scredits--;
+			*num = min_t(unsigned int, size,
+				     scredits * SMB2_MAX_BUFFER_SIZE);
+
+			*credits = DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
+			server->credits -= *credits;
+			server->in_flight++;
+			break;
+		}
+	}
+	spin_unlock(&server->req_lock);
+	return rc;
+}
+
+static __u64
+smb2_get_next_mid(struct TCP_Server_Info *server)
+{
+	__u64 mid;
+	/* for SMB2 we need the current value */
+	spin_lock(&GlobalMid_Lock);
+	mid = server->CurrentMid++;
+	spin_unlock(&GlobalMid_Lock);
+	return mid;
+}
+
+static struct mid_q_entry *
+smb2_find_mid(struct TCP_Server_Info *server, char *buf)
+{
+	struct mid_q_entry *mid;
+	struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
+	__u64 wire_mid = le64_to_cpu(hdr->MessageId);
+
+	spin_lock(&GlobalMid_Lock);
+	list_for_each_entry(mid, &server->pending_mid_q, qhead) {
+		if ((mid->mid == wire_mid) &&
+		    (mid->mid_state == MID_REQUEST_SUBMITTED) &&
+		    (mid->command == hdr->Command)) {
+			spin_unlock(&GlobalMid_Lock);
+			return mid;
+		}
+	}
+	spin_unlock(&GlobalMid_Lock);
+	return NULL;
+}
+
+static void
+smb2_dump_detail(void *buf)
+{
+#ifdef CONFIG_CIFS_DEBUG2
+	struct smb2_hdr *smb = (struct smb2_hdr *)buf;
+
+	cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
+		 smb->Command, smb->Status, smb->Flags, smb->MessageId,
+		 smb->ProcessId);
+	cifs_dbg(VFS, "smb buf %p len %u\n", smb, smb2_calc_size(smb));
+#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)
+{
+	int rc;
+	ses->server->CurrentMid = 0;
+	rc = SMB2_negotiate(xid, ses);
+	/* 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 smb_vol *volume_info)
+{
+	struct TCP_Server_Info *server = tcon->ses->server;
+	unsigned int wsize;
+
+	/* start with specified wsize, or default */
+	wsize = volume_info->wsize ? volume_info->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
+smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
+{
+	struct TCP_Server_Info *server = tcon->ses->server;
+	unsigned int rsize;
+
+	/* start with specified rsize, or default */
+	rsize = volume_info->rsize ? volume_info->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;
+}
+
+#ifdef CONFIG_CIFS_STATS2
+static int
+SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
+{
+	int rc;
+	unsigned int ret_data_len = 0;
+	struct network_interface_info_ioctl_rsp *out_buf;
+
+	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
+			FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
+			NULL /* no data input */, 0 /* no data input */,
+			(char **)&out_buf, &ret_data_len);
+	if (rc != 0)
+		cifs_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
+	else if (ret_data_len < sizeof(struct network_interface_info_ioctl_rsp)) {
+		cifs_dbg(VFS, "server returned bad net interface info buf\n");
+		rc = -EINVAL;
+	} else {
+		/* Dump info on first interface */
+		cifs_dbg(FYI, "Adapter Capability 0x%x\t",
+			le32_to_cpu(out_buf->Capability));
+		cifs_dbg(FYI, "Link Speed %lld\n",
+			le64_to_cpu(out_buf->LinkSpeed));
+	}
+
+	return rc;
+}
+#endif /* STATS2 */
+
+static void
+smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
+{
+	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.tcon = tcon;
+	oparms.desired_access = FILE_READ_ATTRIBUTES;
+	oparms.disposition = FILE_OPEN;
+	oparms.create_options = 0;
+	oparms.fid = &fid;
+	oparms.reconnect = false;
+
+	rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
+	if (rc)
+		return;
+
+#ifdef CONFIG_CIFS_STATS2
+	SMB3_request_interfaces(xid, tcon);
+#endif /* STATS2 */
+
+	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_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
+	SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+	return;
+}
+
+static void
+smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
+{
+	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.tcon = tcon;
+	oparms.desired_access = FILE_READ_ATTRIBUTES;
+	oparms.disposition = FILE_OPEN;
+	oparms.create_options = 0;
+	oparms.fid = &fid;
+	oparms.reconnect = false;
+
+	rc = SMB2_open(xid, &oparms, &srch_path, &oplock, 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);
+	return;
+}
+
+static int
+smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
+			struct cifs_sb_info *cifs_sb, const char *full_path)
+{
+	int rc;
+	__le16 *utf16_path;
+	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+
+	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
+	if (!utf16_path)
+		return -ENOMEM;
+
+	oparms.tcon = tcon;
+	oparms.desired_access = FILE_READ_ATTRIBUTES;
+	oparms.disposition = FILE_OPEN;
+	oparms.create_options = 0;
+	oparms.fid = &fid;
+	oparms.reconnect = false;
+
+	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
+	if (rc) {
+		kfree(utf16_path);
+		return rc;
+	}
+
+	rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+	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, FILE_ALL_INFO *data)
+{
+	*uniqueid = le64_to_cpu(data->IndexNumber);
+	return 0;
+}
+
+static int
+smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
+		     struct cifs_fid *fid, FILE_ALL_INFO *data)
+{
+	int rc;
+	struct smb2_file_all_info *smb2_data;
+
+	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
+			    GFP_KERNEL);
+	if (smb2_data == NULL)
+		return -ENOMEM;
+
+	rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
+			     smb2_data);
+	if (!rc)
+		move_smb2_info_to_cifs(data, smb2_data);
+	kfree(smb2_data);
+	return rc;
+}
+
+static bool
+smb2_can_echo(struct TCP_Server_Info *server)
+{
+	return server->echoes;
+}
+
+static void
+smb2_clear_stats(struct cifs_tcon *tcon)
+{
+#ifdef CONFIG_CIFS_STATS
+	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);
+	}
+#endif
+}
+
+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);
+	if (tcon->perf_sector_size)
+		seq_printf(m, "\tOptimal sector size: 0x%x",
+			   tcon->perf_sector_size);
+}
+
+static void
+smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
+{
+#ifdef CONFIG_CIFS_STATS
+	atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
+	atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
+	seq_printf(m, "\nNegotiates: %d sent %d failed",
+		   atomic_read(&sent[SMB2_NEGOTIATE_HE]),
+		   atomic_read(&failed[SMB2_NEGOTIATE_HE]));
+	seq_printf(m, "\nSessionSetups: %d sent %d failed",
+		   atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
+		   atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
+	seq_printf(m, "\nLogoffs: %d sent %d failed",
+		   atomic_read(&sent[SMB2_LOGOFF_HE]),
+		   atomic_read(&failed[SMB2_LOGOFF_HE]));
+	seq_printf(m, "\nTreeConnects: %d sent %d failed",
+		   atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
+		   atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
+	seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
+		   atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
+		   atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
+	seq_printf(m, "\nCreates: %d sent %d failed",
+		   atomic_read(&sent[SMB2_CREATE_HE]),
+		   atomic_read(&failed[SMB2_CREATE_HE]));
+	seq_printf(m, "\nCloses: %d sent %d failed",
+		   atomic_read(&sent[SMB2_CLOSE_HE]),
+		   atomic_read(&failed[SMB2_CLOSE_HE]));
+	seq_printf(m, "\nFlushes: %d sent %d failed",
+		   atomic_read(&sent[SMB2_FLUSH_HE]),
+		   atomic_read(&failed[SMB2_FLUSH_HE]));
+	seq_printf(m, "\nReads: %d sent %d failed",
+		   atomic_read(&sent[SMB2_READ_HE]),
+		   atomic_read(&failed[SMB2_READ_HE]));
+	seq_printf(m, "\nWrites: %d sent %d failed",
+		   atomic_read(&sent[SMB2_WRITE_HE]),
+		   atomic_read(&failed[SMB2_WRITE_HE]));
+	seq_printf(m, "\nLocks: %d sent %d failed",
+		   atomic_read(&sent[SMB2_LOCK_HE]),
+		   atomic_read(&failed[SMB2_LOCK_HE]));
+	seq_printf(m, "\nIOCTLs: %d sent %d failed",
+		   atomic_read(&sent[SMB2_IOCTL_HE]),
+		   atomic_read(&failed[SMB2_IOCTL_HE]));
+	seq_printf(m, "\nCancels: %d sent %d failed",
+		   atomic_read(&sent[SMB2_CANCEL_HE]),
+		   atomic_read(&failed[SMB2_CANCEL_HE]));
+	seq_printf(m, "\nEchos: %d sent %d failed",
+		   atomic_read(&sent[SMB2_ECHO_HE]),
+		   atomic_read(&failed[SMB2_ECHO_HE]));
+	seq_printf(m, "\nQueryDirectories: %d sent %d failed",
+		   atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
+		   atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
+	seq_printf(m, "\nChangeNotifies: %d sent %d failed",
+		   atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
+		   atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
+	seq_printf(m, "\nQueryInfos: %d sent %d failed",
+		   atomic_read(&sent[SMB2_QUERY_INFO_HE]),
+		   atomic_read(&failed[SMB2_QUERY_INFO_HE]));
+	seq_printf(m, "\nSetInfos: %d sent %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]));
+#endif
+}
+
+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;
+	server->ops->set_oplock_level(cinode, oplock, fid->epoch,
+				      &fid->purge_cache);
+	cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
+}
+
+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 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, true /* is_fsctl */,
+			NULL, 0 /* no input */,
+			(char **)&res_key, &ret_data_len);
+
+	if (rc) {
+		cifs_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_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;
+}
+
+static int
+smb2_clone_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;
+
+	pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
+
+	if (pcchunk == NULL)
+		return -ENOMEM;
+
+	cifs_dbg(FYI, "in smb2_clone_range - about to call request res key\n");
+	/* 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(u32, len, tcon->max_bytes_chunk));
+
+		/* Request server copy to target from src identified by key */
+		rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
+			trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
+			true /* is_fsctl */, (char *)pcchunk,
+			sizeof(struct copychunk_ioctl),	(char **)&retbuf,
+			&ret_data_len);
+		if (rc == 0) {
+			if (ret_data_len !=
+					sizeof(struct copychunk_ioctl_rsp)) {
+				cifs_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_dbg(VFS, "invalid copy chunk response\n");
+				rc = -EIO;
+				goto cchunk_out;
+			}
+			if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
+				cifs_dbg(VFS, "invalid num chunks written\n");
+				rc = -EIO;
+				goto cchunk_out;
+			}
+			chunks_copied++;
+
+			src_off += le32_to_cpu(retbuf->TotalBytesWritten);
+			dest_off += le32_to_cpu(retbuf->TotalBytesWritten);
+			len -= le32_to_cpu(retbuf->TotalBytesWritten);
+
+			cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %d\n",
+				le32_to_cpu(retbuf->ChunksWritten),
+				le32_to_cpu(retbuf->ChunkBytesWritten),
+				le32_to_cpu(retbuf->TotalBytesWritten));
+		} 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);
+	return rc;
+}
+
+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)
+{
+	struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
+	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,
+			true /* is_fctl */, &setsparse, 1, 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, false);
+}
+
+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
+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;
+	int rc;
+	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+
+	utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+	if (!utf16_path)
+		return -ENOMEM;
+
+	oparms.tcon = tcon;
+	oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
+	oparms.disposition = FILE_OPEN;
+	oparms.create_options = 0;
+	oparms.fid = fid;
+	oparms.reconnect = false;
+
+	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
+	kfree(utf16_path);
+	if (rc) {
+		cifs_dbg(VFS, "open dir failed\n");
+		return rc;
+	}
+
+	srch_inf->entries_in_buffer = 0;
+	srch_inf->index_of_last_entry = 0;
+
+	rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
+				  fid->volatile_fid, 0, srch_inf);
+	if (rc) {
+		cifs_dbg(VFS, "query directory failed\n");
+		SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
+	}
+	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, int length)
+{
+	struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
+
+	if (hdr->Status != STATUS_PENDING)
+		return false;
+
+	if (!length) {
+		spin_lock(&server->req_lock);
+		server->credits += le16_to_cpu(hdr->CreditRequest);
+		spin_unlock(&server->req_lock);
+		wake_up(&server->request_q);
+	}
+
+	return true;
+}
+
+static int
+smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *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, fid->persistent_fid,
+				 fid->volatile_fid,
+				 CIFS_CACHE_READ(cinode) ? 1 : 0);
+}
+
+static int
+smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
+	     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;
+
+	oparms.tcon = tcon;
+	oparms.desired_access = FILE_READ_ATTRIBUTES;
+	oparms.disposition = FILE_OPEN;
+	oparms.create_options = 0;
+	oparms.fid = &fid;
+	oparms.reconnect = false;
+
+	rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
+	if (rc)
+		return rc;
+	buf->f_type = SMB2_MAGIC_NUMBER;
+	rc = SMB2_QFS_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+			   buf);
+	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)
+{
+	get_random_bytes(fid->lease_key, SMB2_LEASE_KEY_SIZE);
+}
+
+static int
+smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
+		   const char *full_path, char **target_path,
+		   struct cifs_sb_info *cifs_sb)
+{
+	int rc;
+	__le16 *utf16_path;
+	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+	struct smb2_err_rsp *err_buf = NULL;
+	struct smb2_symlink_err_rsp *symlink;
+	unsigned int sub_len, sub_offset;
+
+	cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
+
+	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
+	if (!utf16_path)
+		return -ENOMEM;
+
+	oparms.tcon = tcon;
+	oparms.desired_access = FILE_READ_ATTRIBUTES;
+	oparms.disposition = FILE_OPEN;
+	oparms.create_options = 0;
+	oparms.fid = &fid;
+	oparms.reconnect = false;
+
+	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_buf);
+
+	if (!rc || !err_buf) {
+		kfree(utf16_path);
+		return -ENOENT;
+	}
+	/* open must fail on symlink - reset rc */
+	rc = 0;
+	symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
+	sub_len = le16_to_cpu(symlink->SubstituteNameLength);
+	sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
+	*target_path = cifs_strndup_from_utf16(
+				(char *)symlink->PathBuffer + sub_offset,
+				sub_len, true, cifs_sb->local_nls);
+	if (!(*target_path)) {
+		kfree(utf16_path);
+		return -ENOMEM;
+	}
+	convert_delimiter(*target_path, '/');
+	cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
+	kfree(utf16_path);
+	return rc;
+}
+
+static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
+			    loff_t offset, loff_t len, bool keep_size)
+{
+	struct inode *inode;
+	struct cifsInodeInfo *cifsi;
+	struct cifsFileInfo *cfile = file->private_data;
+	struct file_zero_data_information fsctl_buf;
+	long rc;
+	unsigned int xid;
+
+	xid = get_xid();
+
+	inode = d_inode(cfile->dentry);
+	cifsi = CIFS_I(inode);
+
+	/* if file not oplocked can't be sure whether asking to extend size */
+	if (!CIFS_CACHE_READ(cifsi))
+		if (keep_size == false)
+			return -EOPNOTSUPP;
+
+	/*
+	 * Must check if file sparse since fallocate -z (zero range) assumes
+	 * non-sparse allocation
+	 */
+	if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE))
+		return -EOPNOTSUPP;
+
+	/*
+	 * need to make sure we are not asked to extend the file since the SMB3
+	 * fsctl does not change the file size. In the future we could change
+	 * this to zero the first part of the range then set the file size
+	 * which for a non sparse file would zero the newly extended range
+	 */
+	if (keep_size == false)
+		if (i_size_read(inode) < offset + len)
+			return -EOPNOTSUPP;
+
+	cifs_dbg(FYI, "offset %lld len %lld", 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,
+			true /* is_fctl */, (char *)&fsctl_buf,
+			sizeof(struct file_zero_data_information), NULL, NULL);
+	free_xid(xid);
+	return rc;
+}
+
+static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
+			    loff_t offset, loff_t len)
+{
+	struct inode *inode;
+	struct cifsInodeInfo *cifsi;
+	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 = d_inode(cfile->dentry);
+	cifsi = CIFS_I(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))
+		return -EOPNOTSUPP;
+
+	cifs_dbg(FYI, "offset %lld len %lld", 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,
+			true /* is_fctl */, (char *)&fsctl_buf,
+			sizeof(struct file_zero_data_information), NULL, NULL);
+	free_xid(xid);
+	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;
+
+	xid = get_xid();
+
+	inode = d_inode(cfile->dentry);
+	cifsi = CIFS_I(inode);
+
+	/* if file not oplocked can't be sure whether asking to extend size */
+	if (!CIFS_CACHE_READ(cifsi))
+		if (keep_size == false)
+			return -EOPNOTSUPP;
+
+	/*
+	 * Files are non-sparse by default so falloc may be a no-op
+	 * Must check if file sparse. If not sparse, and not extending
+	 * then no need to do anything since file already allocated
+	 */
+	if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
+		if (keep_size == true)
+			return 0;
+		/* check if extending file */
+		else if (i_size_read(inode) >= off + len)
+			/* not extending file and already not sparse */
+			return 0;
+		/* BB: in future add else clause to extend file */
+		else
+			return -EOPNOTSUPP;
+	}
+
+	if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
+		/*
+		 * 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)))
+			return -EOPNOTSUPP;
+
+		rc = smb2_set_sparse(xid, tcon, cfile, inode, false);
+	}
+	/* BB: else ... in future add code to extend file and set sparse */
+
+
+	free_xid(xid);
+	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 == 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, bool set_level2)
+{
+	if (set_level2)
+		server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
+						0, NULL);
+	else
+		server->ops->set_oplock_level(cinode, 0, 0, NULL);
+}
+
+static void
+smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
+		      unsigned int epoch, bool *purge_cache)
+{
+	oplock &= 0xFF;
+	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->vfs_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->vfs_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->vfs_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};
+
+	oplock &= 0xFF;
+	if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
+		return;
+
+	cinode->oplock = 0;
+	if (oplock & SMB2_LEASE_READ_CACHING_HE) {
+		cinode->oplock |= CIFS_CACHE_READ_FLG;
+		strcat(message, "R");
+	}
+	if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
+		cinode->oplock |= CIFS_CACHE_HANDLE_FLG;
+		strcat(message, "H");
+	}
+	if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
+		cinode->oplock |= CIFS_CACHE_WRITE_FLG;
+		strcat(message, "W");
+	}
+	if (!cinode->oplock)
+		strcat(message, "None");
+	cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
+		 &cinode->vfs_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;
+	}
+}
+
+static bool
+smb2_is_read_op(__u32 oplock)
+{
+	return oplock == SMB2_OPLOCK_LEVEL_II;
+}
+
+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 | SMB2_LEASE_READ_CACHING;
+	else if (oplock == SMB2_OPLOCK_LEVEL_II)
+		return SMB2_LEASE_READ_CACHING;
+	else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
+		return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
+		       SMB2_LEASE_WRITE_CACHING;
+	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;
+
+	buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
+	buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
+	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;
+
+	buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
+	buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
+	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)
+{
+	struct create_lease *lc = (struct create_lease *)buf;
+
+	*epoch = 0; /* not used */
+	if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
+		return SMB2_OPLOCK_LEVEL_NOCHANGE;
+	return le32_to_cpu(lc->lcontext.LeaseState);
+}
+
+static __u8
+smb3_parse_lease_buf(void *buf, unsigned int *epoch)
+{
+	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)
+		return SMB2_OPLOCK_LEVEL_NOCHANGE;
+	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)->wsize,
+		     SMB2_MAX_BUFFER_SIZE);
+}
+
+static bool
+smb2_dir_needs_close(struct cifsFileInfo *cfile)
+{
+	return !cfile->invalidHandle;
+}
+
+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,
+	.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,
+	.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,
+	.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,
+	.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,
+	.clone_range = smb2_clone_range,
+	.wp_retry_size = smb2_wp_retry_size,
+	.dir_needs_close = smb2_dir_needs_close,
+};
+
+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,
+	.get_next_mid = smb2_get_next_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,
+	.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,
+	.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,
+	.clone_range = smb2_clone_range,
+	.wp_retry_size = smb2_wp_retry_size,
+	.dir_needs_close = smb2_dir_needs_close,
+};
+
+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,
+	.get_next_mid = smb2_get_next_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,
+	.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 = 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,
+	.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,
+	.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_smb3signingkey,
+	.calc_signature = smb3_calc_signature,
+	.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,
+	.clone_range = smb2_clone_range,
+	.validate_negotiate = smb3_validate_negotiate,
+	.wp_retry_size = smb2_wp_retry_size,
+	.dir_needs_close = smb2_dir_needs_close,
+	.fallocate = smb3_fallocate,
+};
+
+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_LOCK,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
+	.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 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_LOCK,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
+	.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 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,
+	.large_lock_type = 0,
+	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
+	.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,
+	.large_lock_type = 0,
+	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
+	.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
+	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+	.header_size = sizeof(struct smb2_hdr),
+	.max_header_size = MAX_SMB2_HDR_SIZE,
+	.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
+	.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),
+};