forked from luck/tmp_suning_uos_patched
7d414f396c
The kernel client requests 2 credits for many operations even though they only use 1 credit (presumably to build up a buffer of credit). Some servers seem to give the client as much credit as is requested. In this case, the amount of credit the client has continues increasing to the point where (server->credits * MAX_BUFFER_SIZE) overflows in smb2_wait_mtu_credits(). Fix this by throttling the credit requests if an set limit is reached. For async requests where the credit charge may be > 1, request as much credit as what is charged. The limit is chosen somewhat arbitrarily. The Windows client defaults to 128 credits, the Windows server allows clients up to 512 credits (or 8192 for Windows 2016), and the NetApp server (and at least one other) does not limit clients at all. Choose a high enough value such that the client shouldn't limit performance. This behavior was seen with a NetApp filer (NetApp Release 9.0RC2). Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com> CC: Stable <stable@vger.kernel.org> Signed-off-by: Steve French <smfrench@gmail.com>
75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/*
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* fs/cifs/smb2glob.h
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*
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* Definitions for various global variables and structures
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*
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* Copyright (C) International Business Machines Corp., 2002, 2011
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* Etersoft, 2012
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Jeremy Allison (jra@samba.org)
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* Pavel Shilovsky (pshilovsky@samba.org) 2012
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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*/
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#ifndef _SMB2_GLOB_H
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#define _SMB2_GLOB_H
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#define SMB2_MAGIC_NUMBER 0xFE534D42
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/*
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*****************************************************************
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* Constants go here
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*****************************************************************
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*/
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/*
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* Identifiers for functions that use the open, operation, close pattern
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* in smb2inode.c:smb2_open_op_close()
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*/
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#define SMB2_OP_SET_DELETE 1
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#define SMB2_OP_SET_INFO 2
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#define SMB2_OP_QUERY_INFO 3
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#define SMB2_OP_QUERY_DIR 4
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#define SMB2_OP_MKDIR 5
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#define SMB2_OP_RENAME 6
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#define SMB2_OP_DELETE 7
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#define SMB2_OP_HARDLINK 8
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#define SMB2_OP_SET_EOF 9
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#define SMB2_OP_RMDIR 10
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/* Used when constructing chained read requests. */
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#define CHAINED_REQUEST 1
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#define START_OF_CHAIN 2
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#define END_OF_CHAIN 4
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#define RELATED_REQUEST 8
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#define SMB2_SIGNATURE_SIZE (16)
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#define SMB2_NTLMV2_SESSKEY_SIZE (16)
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#define SMB2_HMACSHA256_SIZE (32)
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#define SMB2_CMACAES_SIZE (16)
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#define SMB3_SIGNKEY_SIZE (16)
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/* Maximum buffer size value we can send with 1 credit */
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#define SMB2_MAX_BUFFER_SIZE 65536
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/*
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* Maximum number of credits to keep available.
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* This value is chosen somewhat arbitrarily. The Windows client
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* defaults to 128 credits, the Windows server allows clients up to
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* 512 credits, and the NetApp server does not limit clients at all.
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* Choose a high enough value such that the client shouldn't limit
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* performance.
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*/
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#define SMB2_MAX_CREDITS_AVAILABLE 32000
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#endif /* _SMB2_GLOB_H */
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