smb: move client and server files to common directory fs/smb

Move CIFS/SMB3 related client and server files (cifs.ko and ksmbd.ko
and helper modules) to new fs/smb subdirectory:

   fs/cifs --> fs/smb/client
   fs/ksmbd --> fs/smb/server
   fs/smbfs_common --> fs/smb/common

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 0 insertions, 944 deletions

diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
deleted file mode 100644
index 3935a60db5c3..000000000000
--- a/fs/cifs/smb2misc.c
+++ /dev/null
@@ -1,944 +0,0 @@
-// SPDX-License-Identifier: LGPL-2.1
-/*
- *
- *   Copyright (C) International Business Machines  Corp., 2002,2011
- *                 Etersoft, 2012
- *   Author(s): Steve French (sfrench@us.ibm.com)
- *              Pavel Shilovsky (pshilovsky@samba.org) 2012
- *
- */
-#include <linux/ctype.h>
-#include "cifsglob.h"
-#include "cifsproto.h"
-#include "smb2proto.h"
-#include "cifs_debug.h"
-#include "cifs_unicode.h"
-#include "smb2status.h"
-#include "smb2glob.h"
-#include "nterr.h"
-#include "cached_dir.h"
-
-static int
-check_smb2_hdr(struct smb2_hdr *shdr, __u64 mid)
-{
-	__u64 wire_mid = le64_to_cpu(shdr->MessageId);
-
-	/*
-	 * Make sure that this really is an SMB, that it is a response,
-	 * and that the message ids match.
-	 */
-	if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) &&
-	    (mid == wire_mid)) {
-		if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
-			return 0;
-		else {
-			/* only one valid case where server sends us request */
-			if (shdr->Command == SMB2_OPLOCK_BREAK)
-				return 0;
-			else
-				cifs_dbg(VFS, "Received Request not response\n");
-		}
-	} else { /* bad signature or mid */
-		if (shdr->ProtocolId != SMB2_PROTO_NUMBER)
-			cifs_dbg(VFS, "Bad protocol string signature header %x\n",
-				 le32_to_cpu(shdr->ProtocolId));
-		if (mid != wire_mid)
-			cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
-				 mid, wire_mid);
-	}
-	cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid);
-	return 1;
-}
-
-/*
- *  The following table defines the expected "StructureSize" of SMB2 responses
- *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS responses.
- *
- *  Note that commands are defined in smb2pdu.h in le16 but the array below is
- *  indexed by command in host byte order
- */
-static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
-	/* SMB2_NEGOTIATE */ cpu_to_le16(65),
-	/* SMB2_SESSION_SETUP */ cpu_to_le16(9),
-	/* SMB2_LOGOFF */ cpu_to_le16(4),
-	/* SMB2_TREE_CONNECT */ cpu_to_le16(16),
-	/* SMB2_TREE_DISCONNECT */ cpu_to_le16(4),
-	/* SMB2_CREATE */ cpu_to_le16(89),
-	/* SMB2_CLOSE */ cpu_to_le16(60),
-	/* SMB2_FLUSH */ cpu_to_le16(4),
-	/* SMB2_READ */ cpu_to_le16(17),
-	/* SMB2_WRITE */ cpu_to_le16(17),
-	/* SMB2_LOCK */ cpu_to_le16(4),
-	/* SMB2_IOCTL */ cpu_to_le16(49),
-	/* BB CHECK this ... not listed in documentation */
-	/* SMB2_CANCEL */ cpu_to_le16(0),
-	/* SMB2_ECHO */ cpu_to_le16(4),
-	/* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9),
-	/* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9),
-	/* SMB2_QUERY_INFO */ cpu_to_le16(9),
-	/* SMB2_SET_INFO */ cpu_to_le16(2),
-	/* BB FIXME can also be 44 for lease break */
-	/* SMB2_OPLOCK_BREAK */ cpu_to_le16(24)
-};
-
-#define SMB311_NEGPROT_BASE_SIZE (sizeof(struct smb2_hdr) + sizeof(struct smb2_negotiate_rsp))
-
-static __u32 get_neg_ctxt_len(struct smb2_hdr *hdr, __u32 len,
-			      __u32 non_ctxlen)
-{
-	__u16 neg_count;
-	__u32 nc_offset, size_of_pad_before_neg_ctxts;
-	struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr;
-
-	/* Negotiate contexts are only valid for latest dialect SMB3.11 */
-	neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount);
-	if ((neg_count == 0) ||
-	   (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID)))
-		return 0;
-
-	/*
-	 * if SPNEGO blob present (ie the RFC2478 GSS info which indicates
-	 * which security mechanisms the server supports) make sure that
-	 * the negotiate contexts start after it
-	 */
-	nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset);
-	/*
-	 * non_ctxlen is at least shdr->StructureSize + pdu->StructureSize2
-	 * and the latter is 1 byte bigger than the fix-sized area of the
-	 * NEGOTIATE response
-	 */
-	if (nc_offset + 1 < non_ctxlen) {
-		pr_warn_once("Invalid negotiate context offset %d\n", nc_offset);
-		return 0;
-	} else if (nc_offset + 1 == non_ctxlen) {
-		cifs_dbg(FYI, "no SPNEGO security blob in negprot rsp\n");
-		size_of_pad_before_neg_ctxts = 0;
-	} else if (non_ctxlen == SMB311_NEGPROT_BASE_SIZE + 1)
-		/* has padding, but no SPNEGO blob */
-		size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen + 1;
-	else
-		size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen;
-
-	/* Verify that at least minimal negotiate contexts fit within frame */
-	if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) {
-		pr_warn_once("negotiate context goes beyond end\n");
-		return 0;
-	}
-
-	cifs_dbg(FYI, "length of negcontexts %d pad %d\n",
-		len - nc_offset, size_of_pad_before_neg_ctxts);
-
-	/* length of negcontexts including pad from end of sec blob to them */
-	return (len - nc_offset) + size_of_pad_before_neg_ctxts;
-}
-
-int
-smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *server)
-{
-	struct TCP_Server_Info *pserver;
-	struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
-	struct smb2_pdu *pdu = (struct smb2_pdu *)shdr;
-	int hdr_size = sizeof(struct smb2_hdr);
-	int pdu_size = sizeof(struct smb2_pdu);
-	int command;
-	__u32 calc_len; /* calculated length */
-	__u64 mid;
-
-	/* If server is a channel, select the primary channel */
-	pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
-
-	/*
-	 * Add function to do table lookup of StructureSize by command
-	 * ie Validate the wct via smb2_struct_sizes table above
-	 */
-	if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
-		struct smb2_transform_hdr *thdr =
-			(struct smb2_transform_hdr *)buf;
-		struct cifs_ses *ses = NULL;
-		struct cifs_ses *iter;
-
-		/* decrypt frame now that it is completely read in */
-		spin_lock(&cifs_tcp_ses_lock);
-		list_for_each_entry(iter, &pserver->smb_ses_list, smb_ses_list) {
-			if (iter->Suid == le64_to_cpu(thdr->SessionId)) {
-				ses = iter;
-				break;
-			}
-		}
-		spin_unlock(&cifs_tcp_ses_lock);
-		if (!ses) {
-			cifs_dbg(VFS, "no decryption - session id not found\n");
-			return 1;
-		}
-	}
-
-	mid = le64_to_cpu(shdr->MessageId);
-	if (len < pdu_size) {
-		if ((len >= hdr_size)
-		    && (shdr->Status != 0)) {
-			pdu->StructureSize2 = 0;
-			/*
-			 * As with SMB/CIFS, on some error cases servers may
-			 * not return wct properly
-			 */
-			return 0;
-		} else {
-			cifs_dbg(VFS, "Length less than SMB header size\n");
-		}
-		return 1;
-	}
-	if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) {
-		cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
-			 mid);
-		return 1;
-	}
-
-	if (check_smb2_hdr(shdr, mid))
-		return 1;
-
-	if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
-		cifs_dbg(VFS, "Invalid structure size %u\n",
-			 le16_to_cpu(shdr->StructureSize));
-		return 1;
-	}
-
-	command = le16_to_cpu(shdr->Command);
-	if (command >= NUMBER_OF_SMB2_COMMANDS) {
-		cifs_dbg(VFS, "Invalid SMB2 command %d\n", command);
-		return 1;
-	}
-
-	if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
-		if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
-		    pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2_LE)) {
-			/* error packets have 9 byte structure size */
-			cifs_dbg(VFS, "Invalid response size %u for command %d\n",
-				 le16_to_cpu(pdu->StructureSize2), command);
-			return 1;
-		} else if (command == SMB2_OPLOCK_BREAK_HE
-			   && (shdr->Status == 0)
-			   && (le16_to_cpu(pdu->StructureSize2) != 44)
-			   && (le16_to_cpu(pdu->StructureSize2) != 36)) {
-			/* special case for SMB2.1 lease break message */
-			cifs_dbg(VFS, "Invalid response size %d for oplock break\n",
-				 le16_to_cpu(pdu->StructureSize2));
-			return 1;
-		}
-	}
-
-	calc_len = smb2_calc_size(buf);
-
-	/* For SMB2_IOCTL, OutputOffset and OutputLength are optional, so might
-	 * be 0, and not a real miscalculation */
-	if (command == SMB2_IOCTL_HE && calc_len == 0)
-		return 0;
-
-	if (command == SMB2_NEGOTIATE_HE)
-		calc_len += get_neg_ctxt_len(shdr, len, calc_len);
-
-	if (len != calc_len) {
-		/* create failed on symlink */
-		if (command == SMB2_CREATE_HE &&
-		    shdr->Status == STATUS_STOPPED_ON_SYMLINK)
-			return 0;
-		/* Windows 7 server returns 24 bytes more */
-		if (calc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE)
-			return 0;
-		/* server can return one byte more due to implied bcc[0] */
-		if (calc_len == len + 1)
-			return 0;
-
-		/*
-		 * Some windows servers (win2016) will pad also the final
-		 * PDU in a compound to 8 bytes.
-		 */
-		if (ALIGN(calc_len, 8) == len)
-			return 0;
-
-		/*
-		 * MacOS server pads after SMB2.1 write response with 3 bytes
-		 * of junk. Other servers match RFC1001 len to actual
-		 * SMB2/SMB3 frame length (header + smb2 response specific data)
-		 * Some windows servers also pad up to 8 bytes when compounding.
-		 */
-		if (calc_len < len)
-			return 0;
-
-		/* Only log a message if len was really miscalculated */
-		if (unlikely(cifsFYI))
-			cifs_dbg(FYI, "Server response too short: calculated "
-				 "length %u doesn't match read length %u (cmd=%d, mid=%llu)\n",
-				 calc_len, len, command, mid);
-		else
-			pr_warn("Server response too short: calculated length "
-				"%u doesn't match read length %u (cmd=%d, mid=%llu)\n",
-				calc_len, len, command, mid);
-
-		return 1;
-	}
-	return 0;
-}
-
-/*
- * The size of the variable area depends on the offset and length fields
- * located in different fields for various SMB2 responses. SMB2 responses
- * with no variable length info, show an offset of zero for the offset field.
- */
-static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
-	/* SMB2_NEGOTIATE */ true,
-	/* SMB2_SESSION_SETUP */ true,
-	/* SMB2_LOGOFF */ false,
-	/* SMB2_TREE_CONNECT */	false,
-	/* SMB2_TREE_DISCONNECT */ false,
-	/* SMB2_CREATE */ true,
-	/* SMB2_CLOSE */ false,
-	/* SMB2_FLUSH */ false,
-	/* SMB2_READ */	true,
-	/* SMB2_WRITE */ false,
-	/* SMB2_LOCK */	false,
-	/* SMB2_IOCTL */ true,
-	/* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
-	/* SMB2_ECHO */ false,
-	/* SMB2_QUERY_DIRECTORY */ true,
-	/* SMB2_CHANGE_NOTIFY */ true,
-	/* SMB2_QUERY_INFO */ true,
-	/* SMB2_SET_INFO */ false,
-	/* SMB2_OPLOCK_BREAK */ false
-};
-
-/*
- * Returns the pointer to the beginning of the data area. Length of the data
- * area and the offset to it (from the beginning of the smb are also returned.
- */
-char *
-smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *shdr)
-{
-	*off = 0;
-	*len = 0;
-
-	/* error responses do not have data area */
-	if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
-	    (((struct smb2_err_rsp *)shdr)->StructureSize) ==
-						SMB2_ERROR_STRUCTURE_SIZE2_LE)
-		return NULL;
-
-	/*
-	 * Following commands have data areas so we have to get the location
-	 * of the data buffer offset and data buffer length for the particular
-	 * command.
-	 */
-	switch (shdr->Command) {
-	case SMB2_NEGOTIATE:
-		*off = le16_to_cpu(
-		  ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset);
-		*len = le16_to_cpu(
-		  ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength);
-		break;
-	case SMB2_SESSION_SETUP:
-		*off = le16_to_cpu(
-		  ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset);
-		*len = le16_to_cpu(
-		  ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength);
-		break;
-	case SMB2_CREATE:
-		*off = le32_to_cpu(
-		    ((struct smb2_create_rsp *)shdr)->CreateContextsOffset);
-		*len = le32_to_cpu(
-		    ((struct smb2_create_rsp *)shdr)->CreateContextsLength);
-		break;
-	case SMB2_QUERY_INFO:
-		*off = le16_to_cpu(
-		    ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset);
-		*len = le32_to_cpu(
-		    ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength);
-		break;
-	case SMB2_READ:
-		/* TODO: is this a bug ? */
-		*off = ((struct smb2_read_rsp *)shdr)->DataOffset;
-		*len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength);
-		break;
-	case SMB2_QUERY_DIRECTORY:
-		*off = le16_to_cpu(
-		  ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset);
-		*len = le32_to_cpu(
-		  ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength);
-		break;
-	case SMB2_IOCTL:
-		*off = le32_to_cpu(
-		  ((struct smb2_ioctl_rsp *)shdr)->OutputOffset);
-		*len = le32_to_cpu(
-		  ((struct smb2_ioctl_rsp *)shdr)->OutputCount);
-		break;
-	case SMB2_CHANGE_NOTIFY:
-		*off = le16_to_cpu(
-		  ((struct smb2_change_notify_rsp *)shdr)->OutputBufferOffset);
-		*len = le32_to_cpu(
-		  ((struct smb2_change_notify_rsp *)shdr)->OutputBufferLength);
-		break;
-	default:
-		cifs_dbg(VFS, "no length check for command %d\n", le16_to_cpu(shdr->Command));
-		break;
-	}
-
-	/*
-	 * Invalid length or offset probably means data area is invalid, but
-	 * we have little choice but to ignore the data area in this case.
-	 */
-	if (*off > 4096) {
-		cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
-		*len = 0;
-		*off = 0;
-	} else if (*off < 0) {
-		cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
-			 *off);
-		*off = 0;
-		*len = 0;
-	} else if (*len < 0) {
-		cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
-			 *len);
-		*len = 0;
-	} else if (*len > 128 * 1024) {
-		cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
-		*len = 0;
-	}
-
-	/* return pointer to beginning of data area, ie offset from SMB start */
-	if ((*off != 0) && (*len != 0))
-		return (char *)shdr + *off;
-	else
-		return NULL;
-}
-
-/*
- * Calculate the size of the SMB message based on the fixed header
- * portion, the number of word parameters and the data portion of the message.
- */
-unsigned int
-smb2_calc_size(void *buf)
-{
-	struct smb2_pdu *pdu = buf;
-	struct smb2_hdr *shdr = &pdu->hdr;
-	int offset; /* the offset from the beginning of SMB to data area */
-	int data_length; /* the length of the variable length data area */
-	/* Structure Size has already been checked to make sure it is 64 */
-	int len = le16_to_cpu(shdr->StructureSize);
-
-	/*
-	 * StructureSize2, ie length of fixed parameter area has already
-	 * been checked to make sure it is the correct length.
-	 */
-	len += le16_to_cpu(pdu->StructureSize2);
-
-	if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
-		goto calc_size_exit;
-
-	smb2_get_data_area_len(&offset, &data_length, shdr);
-	cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
-
-	if (data_length > 0) {
-		/*
-		 * Check to make sure that data area begins after fixed area,
-		 * Note that last byte of the fixed area is part of data area
-		 * for some commands, typically those with odd StructureSize,
-		 * so we must add one to the calculation.
-		 */
-		if (offset + 1 < len) {
-			cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
-				 offset + 1, len);
-			data_length = 0;
-		} else {
-			len = offset + data_length;
-		}
-	}
-calc_size_exit:
-	cifs_dbg(FYI, "SMB2 len %d\n", len);
-	return len;
-}
-
-/* Note: caller must free return buffer */
-__le16 *
-cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
-{
-	int len;
-	const char *start_of_path;
-	__le16 *to;
-	int map_type;
-
-	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
-		map_type = SFM_MAP_UNI_RSVD;
-	else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
-		map_type = SFU_MAP_UNI_RSVD;
-	else
-		map_type = NO_MAP_UNI_RSVD;
-
-	/* Windows doesn't allow paths beginning with \ */
-	if (from[0] == '\\')
-		start_of_path = from + 1;
-
-	/* SMB311 POSIX extensions paths do not include leading slash */
-	else if (cifs_sb_master_tlink(cifs_sb) &&
-		 cifs_sb_master_tcon(cifs_sb)->posix_extensions &&
-		 (from[0] == '/')) {
-		start_of_path = from + 1;
-	} else
-		start_of_path = from;
-
-	to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
-				   cifs_sb->local_nls, map_type);
-	return to;
-}
-
-__le32
-smb2_get_lease_state(struct cifsInodeInfo *cinode)
-{
-	__le32 lease = 0;
-
-	if (CIFS_CACHE_WRITE(cinode))
-		lease |= SMB2_LEASE_WRITE_CACHING_LE;
-	if (CIFS_CACHE_HANDLE(cinode))
-		lease |= SMB2_LEASE_HANDLE_CACHING_LE;
-	if (CIFS_CACHE_READ(cinode))
-		lease |= SMB2_LEASE_READ_CACHING_LE;
-	return lease;
-}
-
-struct smb2_lease_break_work {
-	struct work_struct lease_break;
-	struct tcon_link *tlink;
-	__u8 lease_key[16];
-	__le32 lease_state;
-};
-
-static void
-cifs_ses_oplock_break(struct work_struct *work)
-{
-	struct smb2_lease_break_work *lw = container_of(work,
-				struct smb2_lease_break_work, lease_break);
-	int rc = 0;
-
-	rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
-			      lw->lease_state);
-
-	cifs_dbg(FYI, "Lease release rc %d\n", rc);
-	cifs_put_tlink(lw->tlink);
-	kfree(lw);
-}
-
-static void
-smb2_queue_pending_open_break(struct tcon_link *tlink, __u8 *lease_key,
-			      __le32 new_lease_state)
-{
-	struct smb2_lease_break_work *lw;
-
-	lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
-	if (!lw) {
-		cifs_put_tlink(tlink);
-		return;
-	}
-
-	INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
-	lw->tlink = tlink;
-	lw->lease_state = new_lease_state;
-	memcpy(lw->lease_key, lease_key, SMB2_LEASE_KEY_SIZE);
-	queue_work(cifsiod_wq, &lw->lease_break);
-}
-
-static bool
-smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp)
-{
-	__u8 lease_state;
-	struct cifsFileInfo *cfile;
-	struct cifsInodeInfo *cinode;
-	int ack_req = le32_to_cpu(rsp->Flags &
-				  SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
-
-	lease_state = le32_to_cpu(rsp->NewLeaseState);
-
-	list_for_each_entry(cfile, &tcon->openFileList, tlist) {
-		cinode = CIFS_I(d_inode(cfile->dentry));
-
-		if (memcmp(cinode->lease_key, rsp->LeaseKey,
-							SMB2_LEASE_KEY_SIZE))
-			continue;
-
-		cifs_dbg(FYI, "found in the open list\n");
-		cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
-			 lease_state);
-
-		if (ack_req)
-			cfile->oplock_break_cancelled = false;
-		else
-			cfile->oplock_break_cancelled = true;
-
-		set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
-
-		cfile->oplock_epoch = le16_to_cpu(rsp->Epoch);
-		cfile->oplock_level = lease_state;
-
-		cifs_queue_oplock_break(cfile);
-		return true;
-	}
-
-	return false;
-}
-
-static struct cifs_pending_open *
-smb2_tcon_find_pending_open_lease(struct cifs_tcon *tcon,
-				  struct smb2_lease_break *rsp)
-{
-	__u8 lease_state = le32_to_cpu(rsp->NewLeaseState);
-	int ack_req = le32_to_cpu(rsp->Flags &
-				  SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
-	struct cifs_pending_open *open;
-	struct cifs_pending_open *found = NULL;
-
-	list_for_each_entry(open, &tcon->pending_opens, olist) {
-		if (memcmp(open->lease_key, rsp->LeaseKey,
-			   SMB2_LEASE_KEY_SIZE))
-			continue;
-
-		if (!found && ack_req) {
-			found = open;
-		}
-
-		cifs_dbg(FYI, "found in the pending open list\n");
-		cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
-			 lease_state);
-
-		open->oplock = lease_state;
-	}
-
-	return found;
-}
-
-static bool
-smb2_is_valid_lease_break(char *buffer, struct TCP_Server_Info *server)
-{
-	struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
-	struct TCP_Server_Info *pserver;
-	struct cifs_ses *ses;
-	struct cifs_tcon *tcon;
-	struct cifs_pending_open *open;
-
-	cifs_dbg(FYI, "Checking for lease break\n");
-
-	/* If server is a channel, select the primary channel */
-	pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
-
-	/* look up tcon based on tid & uid */
-	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) {
-			spin_lock(&tcon->open_file_lock);
-			cifs_stats_inc(
-				       &tcon->stats.cifs_stats.num_oplock_brks);
-			if (smb2_tcon_has_lease(tcon, rsp)) {
-				spin_unlock(&tcon->open_file_lock);
-				spin_unlock(&cifs_tcp_ses_lock);
-				return true;
-			}
-			open = smb2_tcon_find_pending_open_lease(tcon,
-								 rsp);
-			if (open) {
-				__u8 lease_key[SMB2_LEASE_KEY_SIZE];
-				struct tcon_link *tlink;
-
-				tlink = cifs_get_tlink(open->tlink);
-				memcpy(lease_key, open->lease_key,
-				       SMB2_LEASE_KEY_SIZE);
-				spin_unlock(&tcon->open_file_lock);
-				spin_unlock(&cifs_tcp_ses_lock);
-				smb2_queue_pending_open_break(tlink,
-							      lease_key,
-							      rsp->NewLeaseState);
-				return true;
-			}
-			spin_unlock(&tcon->open_file_lock);
-
-			if (cached_dir_lease_break(tcon, rsp->LeaseKey)) {
-				spin_unlock(&cifs_tcp_ses_lock);
-				return true;
-			}
-		}
-	}
-	spin_unlock(&cifs_tcp_ses_lock);
-	cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
-	trace_smb3_lease_not_found(le32_to_cpu(rsp->CurrentLeaseState),
-				   le32_to_cpu(rsp->hdr.Id.SyncId.TreeId),
-				   le64_to_cpu(rsp->hdr.SessionId),
-				   *((u64 *)rsp->LeaseKey),
-				   *((u64 *)&rsp->LeaseKey[8]));
-
-	return false;
-}
-
-bool
-smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
-{
-	struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
-	struct TCP_Server_Info *pserver;
-	struct cifs_ses *ses;
-	struct cifs_tcon *tcon;
-	struct cifsInodeInfo *cinode;
-	struct cifsFileInfo *cfile;
-
-	cifs_dbg(FYI, "Checking for oplock break\n");
-
-	if (rsp->hdr.Command != SMB2_OPLOCK_BREAK)
-		return false;
-
-	if (rsp->StructureSize !=
-				smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
-		if (le16_to_cpu(rsp->StructureSize) == 44)
-			return smb2_is_valid_lease_break(buffer, server);
-		else
-			return false;
-	}
-
-	cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
-
-	/* If server is a channel, select the primary channel */
-	pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
-
-	/* look up tcon based on tid & uid */
-	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) {
-
-			spin_lock(&tcon->open_file_lock);
-			list_for_each_entry(cfile, &tcon->openFileList, tlist) {
-				if (rsp->PersistentFid !=
-				    cfile->fid.persistent_fid ||
-				    rsp->VolatileFid !=
-				    cfile->fid.volatile_fid)
-					continue;
-
-				cifs_dbg(FYI, "file id match, oplock break\n");
-				cifs_stats_inc(
-				    &tcon->stats.cifs_stats.num_oplock_brks);
-				cinode = CIFS_I(d_inode(cfile->dentry));
-				spin_lock(&cfile->file_info_lock);
-				if (!CIFS_CACHE_WRITE(cinode) &&
-				    rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
-					cfile->oplock_break_cancelled = true;
-				else
-					cfile->oplock_break_cancelled = false;
-
-				set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
-					&cinode->flags);
-
-				cfile->oplock_epoch = 0;
-				cfile->oplock_level = rsp->OplockLevel;
-
-				spin_unlock(&cfile->file_info_lock);
-
-				cifs_queue_oplock_break(cfile);
-
-				spin_unlock(&tcon->open_file_lock);
-				spin_unlock(&cifs_tcp_ses_lock);
-				return true;
-			}
-			spin_unlock(&tcon->open_file_lock);
-		}
-	}
-	spin_unlock(&cifs_tcp_ses_lock);
-	cifs_dbg(FYI, "No file id matched, oplock break ignored\n");
-	trace_smb3_oplock_not_found(0 /* no xid */, rsp->PersistentFid,
-				  le32_to_cpu(rsp->hdr.Id.SyncId.TreeId),
-				  le64_to_cpu(rsp->hdr.SessionId));
-
-	return true;
-}
-
-void
-smb2_cancelled_close_fid(struct work_struct *work)
-{
-	struct close_cancelled_open *cancelled = container_of(work,
-					struct close_cancelled_open, work);
-	struct cifs_tcon *tcon = cancelled->tcon;
-	int rc;
-
-	if (cancelled->mid)
-		cifs_tcon_dbg(VFS, "Close unmatched open for MID:%llu\n",
-			      cancelled->mid);
-	else
-		cifs_tcon_dbg(VFS, "Close interrupted close\n");
-
-	rc = SMB2_close(0, tcon, cancelled->fid.persistent_fid,
-			cancelled->fid.volatile_fid);
-	if (rc)
-		cifs_tcon_dbg(VFS, "Close cancelled mid failed rc:%d\n", rc);
-
-	cifs_put_tcon(tcon);
-	kfree(cancelled);
-}
-
-/*
- * Caller should already has an extra reference to @tcon
- * This function is used to queue work to close a handle to prevent leaks
- * on the server.
- * We handle two cases. If an open was interrupted after we sent the
- * SMB2_CREATE to the server but before we processed the reply, and second
- * if a close was interrupted before we sent the SMB2_CLOSE to the server.
- */
-static int
-__smb2_handle_cancelled_cmd(struct cifs_tcon *tcon, __u16 cmd, __u64 mid,
-			    __u64 persistent_fid, __u64 volatile_fid)
-{
-	struct close_cancelled_open *cancelled;
-
-	cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC);
-	if (!cancelled)
-		return -ENOMEM;
-
-	cancelled->fid.persistent_fid = persistent_fid;
-	cancelled->fid.volatile_fid = volatile_fid;
-	cancelled->tcon = tcon;
-	cancelled->cmd = cmd;
-	cancelled->mid = mid;
-	INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
-	WARN_ON(queue_work(cifsiod_wq, &cancelled->work) == false);
-
-	return 0;
-}
-
-int
-smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid,
-			    __u64 volatile_fid)
-{
-	int rc;
-
-	cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
-	spin_lock(&cifs_tcp_ses_lock);
-	if (tcon->tc_count <= 0) {
-		struct TCP_Server_Info *server = NULL;
-
-		WARN_ONCE(tcon->tc_count < 0, "tcon refcount is negative");
-		spin_unlock(&cifs_tcp_ses_lock);
-
-		if (tcon->ses)
-			server = tcon->ses->server;
-
-		cifs_server_dbg(FYI, "tid=0x%x: tcon is closing, skipping async close retry of fid %llu %llu\n",
-				tcon->tid, persistent_fid, volatile_fid);
-
-		return 0;
-	}
-	tcon->tc_count++;
-	spin_unlock(&cifs_tcp_ses_lock);
-
-	rc = __smb2_handle_cancelled_cmd(tcon, SMB2_CLOSE_HE, 0,
-					 persistent_fid, volatile_fid);
-	if (rc)
-		cifs_put_tcon(tcon);
-
-	return rc;
-}
-
-int
-smb2_handle_cancelled_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server)
-{
-	struct smb2_hdr *hdr = mid->resp_buf;
-	struct smb2_create_rsp *rsp = mid->resp_buf;
-	struct cifs_tcon *tcon;
-	int rc;
-
-	if ((mid->optype & CIFS_CP_CREATE_CLOSE_OP) || hdr->Command != SMB2_CREATE ||
-	    hdr->Status != STATUS_SUCCESS)
-		return 0;
-
-	tcon = smb2_find_smb_tcon(server, le64_to_cpu(hdr->SessionId),
-				  le32_to_cpu(hdr->Id.SyncId.TreeId));
-	if (!tcon)
-		return -ENOENT;
-
-	rc = __smb2_handle_cancelled_cmd(tcon,
-					 le16_to_cpu(hdr->Command),
-					 le64_to_cpu(hdr->MessageId),
-					 rsp->PersistentFileId,
-					 rsp->VolatileFileId);
-	if (rc)
-		cifs_put_tcon(tcon);
-
-	return rc;
-}
-
-/**
- * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
- *
- * Assumes @iov does not contain the rfc1002 length and iov[0] has the
- * SMB2 header.
- *
- * @ses:	server session structure
- * @server:	pointer to server info
- * @iov:	array containing the SMB request we will send to the server
- * @nvec:	number of array entries for the iov
- */
-int
-smb311_update_preauth_hash(struct cifs_ses *ses, struct TCP_Server_Info *server,
-			   struct kvec *iov, int nvec)
-{
-	int i, rc;
-	struct smb2_hdr *hdr;
-	struct shash_desc *sha512 = NULL;
-
-	hdr = (struct smb2_hdr *)iov[0].iov_base;
-	/* neg prot are always taken */
-	if (hdr->Command == SMB2_NEGOTIATE)
-		goto ok;
-
-	/*
-	 * If we process a command which wasn't a negprot it means the
-	 * neg prot was already done, so the server dialect was set
-	 * and we can test it. Preauth requires 3.1.1 for now.
-	 */
-	if (server->dialect != SMB311_PROT_ID)
-		return 0;
-
-	if (hdr->Command != SMB2_SESSION_SETUP)
-		return 0;
-
-	/* skip last sess setup response */
-	if ((hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
-	    && (hdr->Status == NT_STATUS_OK
-		|| (hdr->Status !=
-		    cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))))
-		return 0;
-
-ok:
-	rc = smb311_crypto_shash_allocate(server);
-	if (rc)
-		return rc;
-
-	sha512 = server->secmech.sha512;
-	rc = crypto_shash_init(sha512);
-	if (rc) {
-		cifs_dbg(VFS, "%s: Could not init sha512 shash\n", __func__);
-		return rc;
-	}
-
-	rc = crypto_shash_update(sha512, ses->preauth_sha_hash,
-				 SMB2_PREAUTH_HASH_SIZE);
-	if (rc) {
-		cifs_dbg(VFS, "%s: Could not update sha512 shash\n", __func__);
-		return rc;
-	}
-
-	for (i = 0; i < nvec; i++) {
-		rc = crypto_shash_update(sha512, iov[i].iov_base, iov[i].iov_len);
-		if (rc) {
-			cifs_dbg(VFS, "%s: Could not update sha512 shash\n",
-				 __func__);
-			return rc;
-		}
-	}
-
-	rc = crypto_shash_final(sha512, ses->preauth_sha_hash);
-	if (rc) {
-		cifs_dbg(VFS, "%s: Could not finalize sha512 shash\n",
-			 __func__);
-		return rc;
-	}
-
-	return 0;
-}