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596bbe53eb
The max possible is the maximum RPC payload. The default depends on amount of total memory. The value can be set within reason as long as no nfsd threads are currently running. The value can also be ready, allowing the default to be determined after nfsd has started. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/*
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* include/linux/nfsd/const.h
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*
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* Various constants related to NFS.
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*
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* Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef _LINUX_NFSD_CONST_H
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#define _LINUX_NFSD_CONST_H
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#include <linux/nfs.h>
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#include <linux/nfs2.h>
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#include <linux/nfs3.h>
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#include <linux/nfs4.h>
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#include <linux/sunrpc/msg_prot.h>
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/*
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* Maximum protocol version supported by knfsd
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*/
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#define NFSSVC_MAXVERS 3
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/*
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* Maximum blocksizes supported by daemon under various circumstances.
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*/
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#define NFSSVC_MAXBLKSIZE RPCSVC_MAXPAYLOAD
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/* NFSv2 is limited by the protocol specification, see RFC 1094 */
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#define NFSSVC_MAXBLKSIZE_V2 (8*1024)
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#ifdef __KERNEL__
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#ifndef NFS_SUPER_MAGIC
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# define NFS_SUPER_MAGIC 0x6969
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#endif
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/*
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* Largest number of bytes we need to allocate for an NFS
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* call or reply. Used to control buffer sizes. We use
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* the length of v3 WRITE, READDIR and READDIR replies
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* which are an RPC header, up to 26 XDR units of reply
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* data, and some page data.
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*
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* Note that accuracy here doesn't matter too much as the
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* size is rounded up to a page size when allocating space.
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*/
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#define NFSD_BUFSIZE ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)
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#ifdef CONFIG_NFSD_V4
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# define NFSSVC_XDRSIZE NFS4_SVC_XDRSIZE
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#elif defined(CONFIG_NFSD_V3)
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# define NFSSVC_XDRSIZE NFS3_SVC_XDRSIZE
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#else
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# define NFSSVC_XDRSIZE NFS2_SVC_XDRSIZE
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#endif
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#endif /* __KERNEL__ */
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#endif /* _LINUX_NFSD_CONST_H */
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