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7f87fc2d34
linux/fs/nfsd/xdr3.h
Chuck Lever 7f87fc2d34 NFSD: Update NFSv3 READDIR entry encoders to use struct xdr_stream 
The benefit of the xdr_stream helpers is that they transparently
handle encoding an XDR data item that crosses page boundaries.
Most of the open-coded logic to do that here can be eliminated.

A sub-buffer and sub-stream are set up as a sink buffer for the
directory entry encoder. As an entry is encoded, it is added to
the end of the content in this buffer/stream. The total length of
the directory list is tracked in the buffer's @len field.

When it comes time to encode the Reply, the sub-buffer is merged
into rq_res's page array at the correct place using
xdr_write_pages().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 10:18:56 -04:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* XDR types for NFSv3 in nfsd.
*
* Copyright (C) 1996-1998, Olaf Kirch <okir@monad.swb.de>
*/
#ifndef _LINUX_NFSD_XDR3_H
#define _LINUX_NFSD_XDR3_H
#include "xdr.h"
struct nfsd3_sattrargs {
struct svc_fh fh;
struct iattr attrs;
int check_guard;
time64_t guardtime;
};
struct nfsd3_diropargs {
struct svc_fh fh;
char * name;
unsigned int len;
};
struct nfsd3_accessargs {
struct svc_fh fh;
__u32 access;
};
struct nfsd3_readargs {
struct svc_fh fh;
__u64 offset;
__u32 count;
};
struct nfsd3_writeargs {
svc_fh fh;
__u64 offset;
__u32 count;
int stable;
__u32 len;
struct kvec first;
};
struct nfsd3_createargs {
struct svc_fh fh;
char * name;
unsigned int len;
int createmode;
struct iattr attrs;
__be32 * verf;
};
struct nfsd3_mknodargs {
struct svc_fh fh;
char * name;
unsigned int len;
__u32 ftype;
__u32 major, minor;
struct iattr attrs;
};
struct nfsd3_renameargs {
struct svc_fh ffh;
char * fname;
unsigned int flen;
struct svc_fh tfh;
char * tname;
unsigned int tlen;
};
struct nfsd3_linkargs {
struct svc_fh ffh;
struct svc_fh tfh;
char * tname;
unsigned int tlen;
};
struct nfsd3_symlinkargs {
struct svc_fh ffh;
char * fname;
unsigned int flen;
char * tname;
unsigned int tlen;
struct iattr attrs;
struct kvec first;
};
struct nfsd3_readdirargs {
struct svc_fh fh;
__u64 cookie;
__u32 count;
__be32 * verf;
};
struct nfsd3_commitargs {
struct svc_fh fh;
__u64 offset;
__u32 count;
};
struct nfsd3_getaclargs {
struct svc_fh fh;
__u32 mask;
};
struct posix_acl;
struct nfsd3_setaclargs {
struct svc_fh fh;
__u32 mask;
struct posix_acl *acl_access;
struct posix_acl *acl_default;
};
struct nfsd3_attrstat {
__be32 status;
struct svc_fh fh;
struct kstat stat;
};
/* LOOKUP, CREATE, MKDIR, SYMLINK, MKNOD */
struct nfsd3_diropres {
__be32 status;
struct svc_fh dirfh;
struct svc_fh fh;
};
struct nfsd3_accessres {
__be32 status;
struct svc_fh fh;
__u32 access;
struct kstat stat;
};
struct nfsd3_readlinkres {
__be32 status;
struct svc_fh fh;
__u32 len;
struct page **pages;
};
struct nfsd3_readres {
__be32 status;
struct svc_fh fh;
unsigned long count;
__u32 eof;
struct page **pages;
};
struct nfsd3_writeres {
__be32 status;
struct svc_fh fh;
unsigned long count;
int committed;
__be32 verf[2];
};
struct nfsd3_renameres {
__be32 status;
struct svc_fh ffh;
struct svc_fh tfh;
};
struct nfsd3_linkres {
__be32 status;
struct svc_fh tfh;
struct svc_fh fh;
};
struct nfsd3_readdirres {
/* Components of the reply */
__be32 status;
struct svc_fh fh;
int count;
__be32 verf[2];
/* Used to encode the reply's entry list */
struct xdr_stream xdr;
struct xdr_buf dirlist;
struct svc_fh scratch;
struct readdir_cd common;
__be32 * buffer;
int buflen;
__be32 * offset;
__be32 * offset1;
unsigned int cookie_offset;
struct svc_rqst * rqstp;
};
struct nfsd3_fsstatres {
__be32 status;
struct kstatfs stats;
__u32 invarsec;
};
struct nfsd3_fsinfores {
__be32 status;
__u32 f_rtmax;
__u32 f_rtpref;
__u32 f_rtmult;
__u32 f_wtmax;
__u32 f_wtpref;
__u32 f_wtmult;
__u32 f_dtpref;
__u64 f_maxfilesize;
__u32 f_properties;
};
struct nfsd3_pathconfres {
__be32 status;
__u32 p_link_max;
__u32 p_name_max;
__u32 p_no_trunc;
__u32 p_chown_restricted;
__u32 p_case_insensitive;
__u32 p_case_preserving;
};
struct nfsd3_commitres {
__be32 status;
struct svc_fh fh;
__be32 verf[2];
};
struct nfsd3_getaclres {
__be32 status;
struct svc_fh fh;
int mask;
struct posix_acl *acl_access;
struct posix_acl *acl_default;
struct kstat stat;
};
/* dummy type for release */
struct nfsd3_fhandle_pair {
__u32 dummy;
struct svc_fh fh1;
struct svc_fh fh2;
};
/*
* Storage requirements for XDR arguments and results.
*/
union nfsd3_xdrstore {
struct nfsd3_sattrargs sattrargs;
struct nfsd3_diropargs diropargs;
struct nfsd3_readargs readargs;
struct nfsd3_writeargs writeargs;
struct nfsd3_createargs createargs;
struct nfsd3_renameargs renameargs;
struct nfsd3_linkargs linkargs;
struct nfsd3_symlinkargs symlinkargs;
struct nfsd3_readdirargs readdirargs;
struct nfsd3_diropres diropres;
struct nfsd3_accessres accessres;
struct nfsd3_readlinkres readlinkres;
struct nfsd3_readres readres;
struct nfsd3_writeres writeres;
struct nfsd3_renameres renameres;
struct nfsd3_linkres linkres;
struct nfsd3_readdirres readdirres;
struct nfsd3_fsstatres fsstatres;
struct nfsd3_fsinfores fsinfores;
struct nfsd3_pathconfres pathconfres;
struct nfsd3_commitres commitres;
struct nfsd3_getaclres getaclres;
};
#define NFS3_SVC_XDRSIZE sizeof(union nfsd3_xdrstore)
int nfs3svc_decode_fhandleargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_sattrargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_diropargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_accessargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_readargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_writeargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_createargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_mkdirargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_mknodargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_renameargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_linkargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_symlinkargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_readdirargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_readdirplusargs(struct svc_rqst *, __be32 *);
int nfs3svc_decode_commitargs(struct svc_rqst *, __be32 *);
int nfs3svc_encode_getattrres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_wccstat(struct svc_rqst *, __be32 *);
int nfs3svc_encode_lookupres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_accessres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_readlinkres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_readres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_writeres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_createres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_renameres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_linkres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_readdirres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_fsstatres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_fsinfores(struct svc_rqst *, __be32 *);
int nfs3svc_encode_pathconfres(struct svc_rqst *, __be32 *);
int nfs3svc_encode_commitres(struct svc_rqst *, __be32 *);
void nfs3svc_release_fhandle(struct svc_rqst *);
void nfs3svc_release_fhandle2(struct svc_rqst *);
void nfs3svc_encode_cookie3(struct nfsd3_readdirres *resp, u64 offset);
int nfs3svc_encode_entry(void *, const char *name,
int namlen, loff_t offset, u64 ino,
unsigned int);
int nfs3svc_encode_entry_plus(void *, const char *name,
int namlen, loff_t offset, u64 ino,
unsigned int);
int nfs3svc_encode_entry3(void *data, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type);
int nfs3svc_encode_entryplus3(void *data, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type);
/* Helper functions for NFSv3 ACL code */
__be32 *nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p,
struct svc_fh *fhp);
bool svcxdr_decode_nfs_fh3(struct xdr_stream *xdr, struct svc_fh *fhp);
#endif /* _LINUX_NFSD_XDR3_H */
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