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9f8f9c774a
This patch will set the maximum transmit buffer size for rcom messages with "names" to 4096 bytes. It's a leftover change of commit4798cbbfbd("fs: dlm: rework receive handling"). Fact is that we cannot allocate a contiguous transmit buffer length above of 4096 bytes. It seems at some places the upper layer protocol will calculate according to dlm_config.ci_buffer_size the possible payload of a dlm recovery message. As compiler setting we will use now the maximum possible message which dlm can send out. Commit4e192ee68e("fs: dlm: disallow buffer size below default") disallow a buffer setting smaller than the 4096 bytes and above 4096 bytes is definitely wrong because we will then write out of buffer space as we cannot allocate a contiguous buffer above 4096 bytes. The ci_buffer_size is still there to define the possible maximum receive buffer size of a recvmsg() which should be at least the maximum possible dlm message size. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
28 lines
1,014 B
C
28 lines
1,014 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/******************************************************************************
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
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**
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**
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*******************************************************************************
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******************************************************************************/
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#ifndef __LOWCOMMS_DOT_H__
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#define __LOWCOMMS_DOT_H__
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#define LOWCOMMS_MAX_TX_BUFFER_LEN 4096
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int dlm_lowcomms_start(void);
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void dlm_lowcomms_stop(void);
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void dlm_lowcomms_exit(void);
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int dlm_lowcomms_close(int nodeid);
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void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc);
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void dlm_lowcomms_commit_buffer(void *mh);
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int dlm_lowcomms_connect_node(int nodeid);
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int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len);
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#endif /* __LOWCOMMS_DOT_H__ */
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