forked from luck/tmp_suning_uos_patched
5002c58639
Support direct requests that span multiple pnfs data servers by comparing nfs_pgio_header->verf to a cached verf in pnfs_commit_bucket. Continue to use dreq->verf if the MDS is used / non-pNFS. Signed-off-by: Weston Andros Adamson <dros@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/*
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* NFS protocol definitions
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*
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* This file contains constants mostly for Version 2 of the protocol,
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* but also has a couple of NFSv3 bits in (notably the error codes).
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*/
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#ifndef _LINUX_NFS_H
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#define _LINUX_NFS_H
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#include <linux/sunrpc/msg_prot.h>
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#include <linux/string.h>
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#include <uapi/linux/nfs.h>
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/*
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* This is the kernel NFS client file handle representation
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*/
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#define NFS_MAXFHSIZE 128
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struct nfs_fh {
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unsigned short size;
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unsigned char data[NFS_MAXFHSIZE];
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};
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/*
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* Returns a zero iff the size and data fields match.
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* Checks only "size" bytes in the data field.
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*/
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static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b)
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{
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return a->size != b->size || memcmp(a->data, b->data, a->size) != 0;
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}
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static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source)
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{
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target->size = source->size;
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memcpy(target->data, source->data, source->size);
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}
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/*
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* This is really a general kernel constant, but since nothing like
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* this is defined in the kernel headers, I have to do it here.
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*/
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#define NFS_OFFSET_MAX ((__s64)((~(__u64)0) >> 1))
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enum nfs3_stable_how {
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NFS_UNSTABLE = 0,
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NFS_DATA_SYNC = 1,
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NFS_FILE_SYNC = 2,
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/* used by direct.c to mark verf as invalid */
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NFS_INVALID_STABLE_HOW = -1
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};
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#endif /* _LINUX_NFS_H */
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