linux-stable/fs/nfs/nfs3xdr.c
Chuck Lever ad96b5b5ea NFS: Replace old NFSv3 encoder functions with xdr_stream-based ones
The naming scheme of the new encoder functions, which follows the
NFSv4 XDR encoder functions, is slightly different than the scheme
used for the old functions.  Rename the functions as a separate
step to keep the patches clean.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-12-16 12:37:22 -05:00

2041 lines
46 KiB
C

/*
* linux/fs/nfs/nfs3xdr.c
*
* XDR functions to encode/decode NFSv3 RPC arguments and results.
*
* Copyright (C) 1996, 1997 Olaf Kirch
*/
#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/kdev_t.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#include <linux/nfsacl.h>
#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_XDR
/* Mapping from NFS error code to "errno" error code. */
#define errno_NFSERR_IO EIO
/*
* Declare the space requirements for NFS arguments and replies as
* number of 32bit-words
*/
#define NFS3_fhandle_sz (1+16)
#define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
#define NFS3_sattr_sz (15)
#define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
#define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
#define NFS3_fattr_sz (21)
#define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2)
#define NFS3_wcc_attr_sz (6)
#define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
#define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
#define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
#define NFS3_fsstat_sz
#define NFS3_fsinfo_sz
#define NFS3_pathconf_sz
#define NFS3_entry_sz (NFS3_filename_sz+3)
#define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
#define NFS3_getattrargs_sz (NFS3_fh_sz)
#define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
#define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz)
#define NFS3_accessargs_sz (NFS3_fh_sz+1)
#define NFS3_readlinkargs_sz (NFS3_fh_sz)
#define NFS3_readargs_sz (NFS3_fh_sz+3)
#define NFS3_writeargs_sz (NFS3_fh_sz+5)
#define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
#define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
#define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
#define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
#define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
#define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
#define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
#define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3)
#define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
#define NFS3_commitargs_sz (NFS3_fh_sz+3)
#define NFS3_attrstat_sz (1+NFS3_fattr_sz)
#define NFS3_wccstat_sz (1+NFS3_wcc_data_sz)
#define NFS3_removeres_sz (NFS3_wccstat_sz)
#define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
#define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
#define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1)
#define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3)
#define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
#define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
#define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
#define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
#define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2)
#define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
#define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
#define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
#define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
#define ACL3_getaclargs_sz (NFS3_fh_sz+1)
#define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
#define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
#define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
/*
* Map file type to S_IFMT bits
*/
static const umode_t nfs_type2fmt[] = {
[NF3BAD] = 0,
[NF3REG] = S_IFREG,
[NF3DIR] = S_IFDIR,
[NF3BLK] = S_IFBLK,
[NF3CHR] = S_IFCHR,
[NF3LNK] = S_IFLNK,
[NF3SOCK] = S_IFSOCK,
[NF3FIFO] = S_IFIFO,
};
static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
dprintk("nfs: %s: prematurely hit end of receive buffer. "
"Remaining buffer length is %tu words.\n",
func, xdr->end - xdr->p);
}
/*
* While encoding arguments, set up the reply buffer in advance to
* receive reply data directly into the page cache.
*/
static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
unsigned int base, unsigned int len,
unsigned int bufsize)
{
struct rpc_auth *auth = req->rq_cred->cr_auth;
unsigned int replen;
replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
}
/*
* Common NFS XDR functions as inlines
*/
static inline __be32 *
xdr_encode_fhandle(__be32 *p, const struct nfs_fh *fh)
{
return xdr_encode_array(p, fh->data, fh->size);
}
static inline __be32 *
xdr_decode_fhandle(__be32 *p, struct nfs_fh *fh)
{
if ((fh->size = ntohl(*p++)) <= NFS3_FHSIZE) {
memcpy(fh->data, p, fh->size);
return p + XDR_QUADLEN(fh->size);
}
return NULL;
}
static inline __be32 *
xdr_decode_fhandle_stream(struct xdr_stream *xdr, struct nfs_fh *fh)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
goto out_overflow;
fh->size = ntohl(*p++);
if (fh->size <= NFS3_FHSIZE) {
p = xdr_inline_decode(xdr, fh->size);
if (unlikely(!p))
goto out_overflow;
memcpy(fh->data, p, fh->size);
return p + XDR_QUADLEN(fh->size);
}
return NULL;
out_overflow:
print_overflow_msg(__func__, xdr);
return ERR_PTR(-EIO);
}
/*
* Encode/decode time.
*/
static inline __be32 *
xdr_encode_time3(__be32 *p, const struct timespec *timep)
{
*p++ = htonl(timep->tv_sec);
*p++ = htonl(timep->tv_nsec);
return p;
}
static inline __be32 *
xdr_decode_time3(__be32 *p, struct timespec *timep)
{
timep->tv_sec = ntohl(*p++);
timep->tv_nsec = ntohl(*p++);
return p;
}
static __be32 *
xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
{
unsigned int type, major, minor;
umode_t fmode;
type = ntohl(*p++);
if (type > NF3FIFO)
type = NF3NON;
fmode = nfs_type2fmt[type];
fattr->mode = (ntohl(*p++) & ~S_IFMT) | fmode;
fattr->nlink = ntohl(*p++);
fattr->uid = ntohl(*p++);
fattr->gid = ntohl(*p++);
p = xdr_decode_hyper(p, &fattr->size);
p = xdr_decode_hyper(p, &fattr->du.nfs3.used);
/* Turn remote device info into Linux-specific dev_t */
major = ntohl(*p++);
minor = ntohl(*p++);
fattr->rdev = MKDEV(major, minor);
if (MAJOR(fattr->rdev) != major || MINOR(fattr->rdev) != minor)
fattr->rdev = 0;
p = xdr_decode_hyper(p, &fattr->fsid.major);
fattr->fsid.minor = 0;
p = xdr_decode_hyper(p, &fattr->fileid);
p = xdr_decode_time3(p, &fattr->atime);
p = xdr_decode_time3(p, &fattr->mtime);
p = xdr_decode_time3(p, &fattr->ctime);
/* Update the mode bits */
fattr->valid |= NFS_ATTR_FATTR_V3;
return p;
}
static inline __be32 *
xdr_encode_sattr(__be32 *p, const struct iattr *attr)
{
if (attr->ia_valid & ATTR_MODE) {
*p++ = xdr_one;
*p++ = htonl(attr->ia_mode & S_IALLUGO);
} else {
*p++ = xdr_zero;
}
if (attr->ia_valid & ATTR_UID) {
*p++ = xdr_one;
*p++ = htonl(attr->ia_uid);
} else {
*p++ = xdr_zero;
}
if (attr->ia_valid & ATTR_GID) {
*p++ = xdr_one;
*p++ = htonl(attr->ia_gid);
} else {
*p++ = xdr_zero;
}
if (attr->ia_valid & ATTR_SIZE) {
*p++ = xdr_one;
p = xdr_encode_hyper(p, (__u64) attr->ia_size);
} else {
*p++ = xdr_zero;
}
if (attr->ia_valid & ATTR_ATIME_SET) {
*p++ = xdr_two;
p = xdr_encode_time3(p, &attr->ia_atime);
} else if (attr->ia_valid & ATTR_ATIME) {
*p++ = xdr_one;
} else {
*p++ = xdr_zero;
}
if (attr->ia_valid & ATTR_MTIME_SET) {
*p++ = xdr_two;
p = xdr_encode_time3(p, &attr->ia_mtime);
} else if (attr->ia_valid & ATTR_MTIME) {
*p++ = xdr_one;
} else {
*p++ = xdr_zero;
}
return p;
}
static inline __be32 *
xdr_decode_wcc_attr(__be32 *p, struct nfs_fattr *fattr)
{
p = xdr_decode_hyper(p, &fattr->pre_size);
p = xdr_decode_time3(p, &fattr->pre_mtime);
p = xdr_decode_time3(p, &fattr->pre_ctime);
fattr->valid |= NFS_ATTR_FATTR_PRESIZE
| NFS_ATTR_FATTR_PREMTIME
| NFS_ATTR_FATTR_PRECTIME;
return p;
}
static inline __be32 *
xdr_decode_post_op_attr(__be32 *p, struct nfs_fattr *fattr)
{
if (*p++)
p = xdr_decode_fattr(p, fattr);
return p;
}
static inline __be32 *
xdr_decode_post_op_attr_stream(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
goto out_overflow;
if (ntohl(*p++)) {
p = xdr_inline_decode(xdr, 84);
if (unlikely(!p))
goto out_overflow;
p = xdr_decode_fattr(p, fattr);
}
return p;
out_overflow:
print_overflow_msg(__func__, xdr);
return ERR_PTR(-EIO);
}
static inline __be32 *
xdr_decode_pre_op_attr(__be32 *p, struct nfs_fattr *fattr)
{
if (*p++)
return xdr_decode_wcc_attr(p, fattr);
return p;
}
static inline __be32 *
xdr_decode_wcc_data(__be32 *p, struct nfs_fattr *fattr)
{
p = xdr_decode_pre_op_attr(p, fattr);
return xdr_decode_post_op_attr(p, fattr);
}
/*
* Encode/decode NFSv3 basic data types
*
* Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
* "NFS Version 3 Protocol Specification".
*
* Not all basic data types have their own encoding and decoding
* functions. For run-time efficiency, some data types are encoded
* or decoded inline.
*/
static void encode_uint32(struct xdr_stream *xdr, u32 value)
{
__be32 *p = xdr_reserve_space(xdr, 4);
*p = cpu_to_be32(value);
}
/*
* filename3
*
* typedef string filename3<>;
*/
static void encode_filename3(struct xdr_stream *xdr,
const char *name, u32 length)
{
__be32 *p;
BUG_ON(length > NFS3_MAXNAMLEN);
p = xdr_reserve_space(xdr, 4 + length);
xdr_encode_opaque(p, name, length);
}
/*
* nfspath3
*
* typedef string nfspath3<>;
*/
static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
const u32 length)
{
BUG_ON(length > NFS3_MAXPATHLEN);
encode_uint32(xdr, length);
xdr_write_pages(xdr, pages, 0, length);
}
/*
* cookie3
*
* typedef uint64 cookie3
*/
static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
{
return xdr_encode_hyper(p, cookie);
}
/*
* cookieverf3
*
* typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
*/
static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
{
memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
}
/*
* createverf3
*
* typedef opaque createverf3[NFS3_CREATEVERFSIZE];
*/
static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
{
__be32 *p;
p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
memcpy(p, verifier, NFS3_CREATEVERFSIZE);
}
/*
* ftype3
*
* enum ftype3 {
* NF3REG = 1,
* NF3DIR = 2,
* NF3BLK = 3,
* NF3CHR = 4,
* NF3LNK = 5,
* NF3SOCK = 6,
* NF3FIFO = 7
* };
*/
static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
{
BUG_ON(type > NF3FIFO);
encode_uint32(xdr, type);
}
/*
* specdata3
*
* struct specdata3 {
* uint32 specdata1;
* uint32 specdata2;
* };
*/
static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
{
__be32 *p;
p = xdr_reserve_space(xdr, 8);
*p++ = cpu_to_be32(MAJOR(rdev));
*p = cpu_to_be32(MINOR(rdev));
}
/*
* nfs_fh3
*
* struct nfs_fh3 {
* opaque data<NFS3_FHSIZE>;
* };
*/
static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
{
__be32 *p;
BUG_ON(fh->size > NFS3_FHSIZE);
p = xdr_reserve_space(xdr, 4 + fh->size);
xdr_encode_opaque(p, fh->data, fh->size);
}
/*
* sattr3
*
* enum time_how {
* DONT_CHANGE = 0,
* SET_TO_SERVER_TIME = 1,
* SET_TO_CLIENT_TIME = 2
* };
*
* union set_mode3 switch (bool set_it) {
* case TRUE:
* mode3 mode;
* default:
* void;
* };
*
* union set_uid3 switch (bool set_it) {
* case TRUE:
* uid3 uid;
* default:
* void;
* };
*
* union set_gid3 switch (bool set_it) {
* case TRUE:
* gid3 gid;
* default:
* void;
* };
*
* union set_size3 switch (bool set_it) {
* case TRUE:
* size3 size;
* default:
* void;
* };
*
* union set_atime switch (time_how set_it) {
* case SET_TO_CLIENT_TIME:
* nfstime3 atime;
* default:
* void;
* };
*
* union set_mtime switch (time_how set_it) {
* case SET_TO_CLIENT_TIME:
* nfstime3 mtime;
* default:
* void;
* };
*
* struct sattr3 {
* set_mode3 mode;
* set_uid3 uid;
* set_gid3 gid;
* set_size3 size;
* set_atime atime;
* set_mtime mtime;
* };
*/
static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
{
u32 nbytes;
__be32 *p;
/*
* In order to make only a single xdr_reserve_space() call,
* pre-compute the total number of bytes to be reserved.
* Six boolean values, one for each set_foo field, are always
* present in the encoded result, so start there.
*/
nbytes = 6 * 4;
if (attr->ia_valid & ATTR_MODE)
nbytes += 4;
if (attr->ia_valid & ATTR_UID)
nbytes += 4;
if (attr->ia_valid & ATTR_GID)
nbytes += 4;
if (attr->ia_valid & ATTR_SIZE)
nbytes += 8;
if (attr->ia_valid & ATTR_ATIME_SET)
nbytes += 8;
if (attr->ia_valid & ATTR_MTIME_SET)
nbytes += 8;
p = xdr_reserve_space(xdr, nbytes);
xdr_encode_sattr(p, attr);
}
/*
* diropargs3
*
* struct diropargs3 {
* nfs_fh3 dir;
* filename3 name;
* };
*/
static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
const char *name, u32 length)
{
encode_nfs_fh3(xdr, fh);
encode_filename3(xdr, name, length);
}
/*
* NFS encode functions
*/
/*
* Encode file handle argument
*/
static int
nfs3_xdr_fhandle(struct rpc_rqst *req, __be32 *p, struct nfs_fh *fh)
{
p = xdr_encode_fhandle(p, fh);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* 3.3.1 GETATTR3args
*
* struct GETATTR3args {
* nfs_fh3 object;
* };
*/
static int nfs3_xdr_enc_getattr3args(struct rpc_rqst *req, __be32 *p,
const struct nfs_fh *fh)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_nfs_fh3(&xdr, fh);
return 0;
}
/*
* Encode SETATTR arguments
*/
static int
nfs3_xdr_sattrargs(struct rpc_rqst *req, __be32 *p, struct nfs3_sattrargs *args)
{
p = xdr_encode_fhandle(p, args->fh);
p = xdr_encode_sattr(p, args->sattr);
*p++ = htonl(args->guard);
if (args->guard)
p = xdr_encode_time3(p, &args->guardtime);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* 3.3.2 SETATTR3args
*
* union sattrguard3 switch (bool check) {
* case TRUE:
* nfstime3 obj_ctime;
* case FALSE:
* void;
* };
*
* struct SETATTR3args {
* nfs_fh3 object;
* sattr3 new_attributes;
* sattrguard3 guard;
* };
*/
static void encode_sattrguard3(struct xdr_stream *xdr,
const struct nfs3_sattrargs *args)
{
__be32 *p;
if (args->guard) {
p = xdr_reserve_space(xdr, 4 + 8);
*p++ = xdr_one;
xdr_encode_time3(p, &args->guardtime);
} else {
p = xdr_reserve_space(xdr, 4);
*p = xdr_zero;
}
}
static int nfs3_xdr_enc_setattr3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_sattrargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_nfs_fh3(&xdr, args->fh);
encode_sattr3(&xdr, args->sattr);
encode_sattrguard3(&xdr, args);
return 0;
}
/*
* Encode directory ops argument
*/
static int
nfs3_xdr_diropargs(struct rpc_rqst *req, __be32 *p, struct nfs3_diropargs *args)
{
p = xdr_encode_fhandle(p, args->fh);
p = xdr_encode_array(p, args->name, args->len);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* 3.3.3 LOOKUP3args
*
* struct LOOKUP3args {
* diropargs3 what;
* };
*/
static int nfs3_xdr_enc_lookup3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_diropargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs3(&xdr, args->fh, args->name, args->len);
return 0;
}
/*
* Encode REMOVE argument
*/
static int
nfs3_xdr_removeargs(struct rpc_rqst *req, __be32 *p, const struct nfs_removeargs *args)
{
p = xdr_encode_fhandle(p, args->fh);
p = xdr_encode_array(p, args->name.name, args->name.len);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* Encode access() argument
*/
static int
nfs3_xdr_accessargs(struct rpc_rqst *req, __be32 *p, struct nfs3_accessargs *args)
{
p = xdr_encode_fhandle(p, args->fh);
*p++ = htonl(args->access);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* 3.3.4 ACCESS3args
*
* struct ACCESS3args {
* nfs_fh3 object;
* uint32 access;
* };
*/
static void encode_access3args(struct xdr_stream *xdr,
const struct nfs3_accessargs *args)
{
encode_nfs_fh3(xdr, args->fh);
encode_uint32(xdr, args->access);
}
static int nfs3_xdr_enc_access3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_accessargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_access3args(&xdr, args);
return 0;
}
/*
* 3.3.5 READLINK3args
*
* struct READLINK3args {
* nfs_fh3 symlink;
* };
*/
static int nfs3_xdr_enc_readlink3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_readlinkargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_nfs_fh3(&xdr, args->fh);
prepare_reply_buffer(req, args->pages, args->pgbase,
args->pglen, NFS3_readlinkres_sz);
return 0;
}
/*
* Arguments to a READ call. Since we read data directly into the page
* cache, we also set up the reply iovec here so that iov[1] points
* exactly to the page we want to fetch.
*/
static int
nfs3_xdr_readargs(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
{
struct rpc_auth *auth = req->rq_cred->cr_auth;
unsigned int replen;
u32 count = args->count;
p = xdr_encode_fhandle(p, args->fh);
p = xdr_encode_hyper(p, args->offset);
*p++ = htonl(count);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
/* Inline the page array */
replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readres_sz) << 2;
xdr_inline_pages(&req->rq_rcv_buf, replen,
args->pages, args->pgbase, count);
req->rq_rcv_buf.flags |= XDRBUF_READ;
return 0;
}
/*
* 3.3.6 READ3args
*
* struct READ3args {
* nfs_fh3 file;
* offset3 offset;
* count3 count;
* };
*/
static void encode_read3args(struct xdr_stream *xdr,
const struct nfs_readargs *args)
{
__be32 *p;
encode_nfs_fh3(xdr, args->fh);
p = xdr_reserve_space(xdr, 8 + 4);
p = xdr_encode_hyper(p, args->offset);
*p = cpu_to_be32(args->count);
}
static int nfs3_xdr_enc_read3args(struct rpc_rqst *req, __be32 *p,
const struct nfs_readargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_read3args(&xdr, args);
prepare_reply_buffer(req, args->pages, args->pgbase,
args->count, NFS3_readres_sz);
req->rq_rcv_buf.flags |= XDRBUF_READ;
return 0;
}
/*
* Write arguments. Splice the buffer to be written into the iovec.
*/
static int
nfs3_xdr_writeargs(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
{
struct xdr_buf *sndbuf = &req->rq_snd_buf;
u32 count = args->count;
p = xdr_encode_fhandle(p, args->fh);
p = xdr_encode_hyper(p, args->offset);
*p++ = htonl(count);
*p++ = htonl(args->stable);
*p++ = htonl(count);
sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);
/* Copy the page array */
xdr_encode_pages(sndbuf, args->pages, args->pgbase, count);
sndbuf->flags |= XDRBUF_WRITE;
return 0;
}
/*
* 3.3.7 WRITE3args
*
* enum stable_how {
* UNSTABLE = 0,
* DATA_SYNC = 1,
* FILE_SYNC = 2
* };
*
* struct WRITE3args {
* nfs_fh3 file;
* offset3 offset;
* count3 count;
* stable_how stable;
* opaque data<>;
* };
*/
static void encode_write3args(struct xdr_stream *xdr,
const struct nfs_writeargs *args)
{
__be32 *p;
encode_nfs_fh3(xdr, args->fh);
p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
p = xdr_encode_hyper(p, args->offset);
*p++ = cpu_to_be32(args->count);
BUG_ON(args->stable > NFS_FILE_SYNC);
*p++ = cpu_to_be32(args->stable);
*p = cpu_to_be32(args->count);
xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
}
static int nfs3_xdr_enc_write3args(struct rpc_rqst *req, __be32 *p,
const struct nfs_writeargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_write3args(&xdr, args);
xdr.buf->flags |= XDRBUF_WRITE;
return 0;
}
/*
* Encode CREATE arguments
*/
static int
nfs3_xdr_createargs(struct rpc_rqst *req, __be32 *p, struct nfs3_createargs *args)
{
p = xdr_encode_fhandle(p, args->fh);
p = xdr_encode_array(p, args->name, args->len);
*p++ = htonl(args->createmode);
if (args->createmode == NFS3_CREATE_EXCLUSIVE) {
*p++ = args->verifier[0];
*p++ = args->verifier[1];
} else
p = xdr_encode_sattr(p, args->sattr);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* 3.3.8 CREATE3args
*
* enum createmode3 {
* UNCHECKED = 0,
* GUARDED = 1,
* EXCLUSIVE = 2
* };
*
* union createhow3 switch (createmode3 mode) {
* case UNCHECKED:
* case GUARDED:
* sattr3 obj_attributes;
* case EXCLUSIVE:
* createverf3 verf;
* };
*
* struct CREATE3args {
* diropargs3 where;
* createhow3 how;
* };
*/
static void encode_createhow3(struct xdr_stream *xdr,
const struct nfs3_createargs *args)
{
encode_uint32(xdr, args->createmode);
switch (args->createmode) {
case NFS3_CREATE_UNCHECKED:
case NFS3_CREATE_GUARDED:
encode_sattr3(xdr, args->sattr);
break;
case NFS3_CREATE_EXCLUSIVE:
encode_createverf3(xdr, args->verifier);
break;
default:
BUG();
}
}
static int nfs3_xdr_enc_create3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_createargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs3(&xdr, args->fh, args->name, args->len);
encode_createhow3(&xdr, args);
return 0;
}
/*
* Encode MKDIR arguments
*/
static int
nfs3_xdr_mkdirargs(struct rpc_rqst *req, __be32 *p, struct nfs3_mkdirargs *args)
{
p = xdr_encode_fhandle(p, args->fh);
p = xdr_encode_array(p, args->name, args->len);
p = xdr_encode_sattr(p, args->sattr);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* 3.3.9 MKDIR3args
*
* struct MKDIR3args {
* diropargs3 where;
* sattr3 attributes;
* };
*/
static int nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_mkdirargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs3(&xdr, args->fh, args->name, args->len);
encode_sattr3(&xdr, args->sattr);
return 0;
}
/*
* Encode SYMLINK arguments
*/
static int
nfs3_xdr_symlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs3_symlinkargs *args)
{
p = xdr_encode_fhandle(p, args->fromfh);
p = xdr_encode_array(p, args->fromname, args->fromlen);
p = xdr_encode_sattr(p, args->sattr);
*p++ = htonl(args->pathlen);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
/* Copy the page */
xdr_encode_pages(&req->rq_snd_buf, args->pages, 0, args->pathlen);
return 0;
}
/*
* 3.3.10 SYMLINK3args
*
* struct symlinkdata3 {
* sattr3 symlink_attributes;
* nfspath3 symlink_data;
* };
*
* struct SYMLINK3args {
* diropargs3 where;
* symlinkdata3 symlink;
* };
*/
static void encode_symlinkdata3(struct xdr_stream *xdr,
const struct nfs3_symlinkargs *args)
{
encode_sattr3(xdr, args->sattr);
encode_nfspath3(xdr, args->pages, args->pathlen);
}
static int nfs3_xdr_enc_symlink3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_symlinkargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs3(&xdr, args->fromfh, args->fromname, args->fromlen);
encode_symlinkdata3(&xdr, args);
return 0;
}
/*
* Encode MKNOD arguments
*/
static int
nfs3_xdr_mknodargs(struct rpc_rqst *req, __be32 *p, struct nfs3_mknodargs *args)
{
p = xdr_encode_fhandle(p, args->fh);
p = xdr_encode_array(p, args->name, args->len);
*p++ = htonl(args->type);
p = xdr_encode_sattr(p, args->sattr);
if (args->type == NF3CHR || args->type == NF3BLK) {
*p++ = htonl(MAJOR(args->rdev));
*p++ = htonl(MINOR(args->rdev));
}
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* 3.3.11 MKNOD3args
*
* struct devicedata3 {
* sattr3 dev_attributes;
* specdata3 spec;
* };
*
* union mknoddata3 switch (ftype3 type) {
* case NF3CHR:
* case NF3BLK:
* devicedata3 device;
* case NF3SOCK:
* case NF3FIFO:
* sattr3 pipe_attributes;
* default:
* void;
* };
*
* struct MKNOD3args {
* diropargs3 where;
* mknoddata3 what;
* };
*/
static void encode_devicedata3(struct xdr_stream *xdr,
const struct nfs3_mknodargs *args)
{
encode_sattr3(xdr, args->sattr);
encode_specdata3(xdr, args->rdev);
}
static void encode_mknoddata3(struct xdr_stream *xdr,
const struct nfs3_mknodargs *args)
{
encode_ftype3(xdr, args->type);
switch (args->type) {
case NF3CHR:
case NF3BLK:
encode_devicedata3(xdr, args);
break;
case NF3SOCK:
case NF3FIFO:
encode_sattr3(xdr, args->sattr);
break;
case NF3REG:
case NF3DIR:
break;
default:
BUG();
}
}
static int nfs3_xdr_enc_mknod3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_mknodargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs3(&xdr, args->fh, args->name, args->len);
encode_mknoddata3(&xdr, args);
return 0;
}
/*
* 3.3.12 REMOVE3args
*
* struct REMOVE3args {
* diropargs3 object;
* };
*/
static int nfs3_xdr_enc_remove3args(struct rpc_rqst *req, __be32 *p,
const struct nfs_removeargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs3(&xdr, args->fh, args->name.name, args->name.len);
return 0;
}
/*
* Encode RENAME arguments
*/
static int
nfs3_xdr_renameargs(struct rpc_rqst *req, __be32 *p, struct nfs_renameargs *args)
{
p = xdr_encode_fhandle(p, args->old_dir);
p = xdr_encode_array(p, args->old_name->name, args->old_name->len);
p = xdr_encode_fhandle(p, args->new_dir);
p = xdr_encode_array(p, args->new_name->name, args->new_name->len);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* 3.3.14 RENAME3args
*
* struct RENAME3args {
* diropargs3 from;
* diropargs3 to;
* };
*/
static int nfs3_xdr_enc_rename3args(struct rpc_rqst *req, __be32 *p,
const struct nfs_renameargs *args)
{
const struct qstr *old = args->old_name;
const struct qstr *new = args->new_name;
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs3(&xdr, args->old_dir, old->name, old->len);
encode_diropargs3(&xdr, args->new_dir, new->name, new->len);
return 0;
}
/*
* Encode LINK arguments
*/
static int
nfs3_xdr_linkargs(struct rpc_rqst *req, __be32 *p, struct nfs3_linkargs *args)
{
p = xdr_encode_fhandle(p, args->fromfh);
p = xdr_encode_fhandle(p, args->tofh);
p = xdr_encode_array(p, args->toname, args->tolen);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* 3.3.15 LINK3args
*
* struct LINK3args {
* nfs_fh3 file;
* diropargs3 link;
* };
*/
static int nfs3_xdr_enc_link3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_linkargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_nfs_fh3(&xdr, args->fromfh);
encode_diropargs3(&xdr, args->tofh, args->toname, args->tolen);
return 0;
}
/*
* Encode arguments to readdir call
*/
static int
nfs3_xdr_readdirargs(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirargs *args)
{
struct rpc_auth *auth = req->rq_cred->cr_auth;
unsigned int replen;
u32 count = args->count;
p = xdr_encode_fhandle(p, args->fh);
p = xdr_encode_hyper(p, args->cookie);
*p++ = args->verf[0];
*p++ = args->verf[1];
if (args->plus) {
/* readdirplus: need dircount + buffer size.
* We just make sure we make dircount big enough */
*p++ = htonl(count >> 3);
}
*p++ = htonl(count);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
/* Inline the page array */
replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readdirres_sz) << 2;
xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0, count);
return 0;
}
/*
* 3.3.16 READDIR3args
*
* struct READDIR3args {
* nfs_fh3 dir;
* cookie3 cookie;
* cookieverf3 cookieverf;
* count3 count;
* };
*/
static void encode_readdir3args(struct xdr_stream *xdr,
const struct nfs3_readdirargs *args)
{
__be32 *p;
encode_nfs_fh3(xdr, args->fh);
p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
p = xdr_encode_cookie3(p, args->cookie);
p = xdr_encode_cookieverf3(p, args->verf);
*p = cpu_to_be32(args->count);
}
static int nfs3_xdr_enc_readdir3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_readdirargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_readdir3args(&xdr, args);
prepare_reply_buffer(req, args->pages, 0,
args->count, NFS3_readdirres_sz);
return 0;
}
/*
* 3.3.17 READDIRPLUS3args
*
* struct READDIRPLUS3args {
* nfs_fh3 dir;
* cookie3 cookie;
* cookieverf3 cookieverf;
* count3 dircount;
* count3 maxcount;
* };
*/
static void encode_readdirplus3args(struct xdr_stream *xdr,
const struct nfs3_readdirargs *args)
{
__be32 *p;
encode_nfs_fh3(xdr, args->fh);
p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
p = xdr_encode_cookie3(p, args->cookie);
p = xdr_encode_cookieverf3(p, args->verf);
/*
* readdirplus: need dircount + buffer size.
* We just make sure we make dircount big enough
*/
*p++ = cpu_to_be32(args->count >> 3);
*p = cpu_to_be32(args->count);
}
static int nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_readdirargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_readdirplus3args(&xdr, args);
prepare_reply_buffer(req, args->pages, 0,
args->count, NFS3_readdirres_sz);
return 0;
}
/*
* Decode the result of a readdir call.
* We just check for syntactical correctness.
*/
static int
nfs3_xdr_readdirres(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirres *res)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct kvec *iov = rcvbuf->head;
struct page **page;
size_t hdrlen;
u32 recvd, pglen;
int status;
status = ntohl(*p++);
/* Decode post_op_attrs */
p = xdr_decode_post_op_attr(p, res->dir_attr);
if (status)
return nfs_stat_to_errno(status);
/* Decode verifier cookie */
if (res->verf) {
res->verf[0] = *p++;
res->verf[1] = *p++;
} else {
p += 2;
}
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
dprintk("NFS: READDIR reply header overflowed:"
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
}
pglen = rcvbuf->page_len;
recvd = rcvbuf->len - hdrlen;
if (pglen > recvd)
pglen = recvd;
page = rcvbuf->pages;
return pglen;
}
__be32 *
nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, struct nfs_server *server, int plus)
{
__be32 *p;
struct nfs_entry old = *entry;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
goto out_overflow;
if (!ntohl(*p++)) {
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
goto out_overflow;
if (!ntohl(*p++))
return ERR_PTR(-EAGAIN);
entry->eof = 1;
return ERR_PTR(-EBADCOOKIE);
}
p = xdr_inline_decode(xdr, 12);
if (unlikely(!p))
goto out_overflow;
p = xdr_decode_hyper(p, &entry->ino);
entry->len = ntohl(*p++);
p = xdr_inline_decode(xdr, entry->len + 8);
if (unlikely(!p))
goto out_overflow;
entry->name = (const char *) p;
p += XDR_QUADLEN(entry->len);
entry->prev_cookie = entry->cookie;
p = xdr_decode_hyper(p, &entry->cookie);
entry->d_type = DT_UNKNOWN;
if (plus) {
entry->fattr->valid = 0;
p = xdr_decode_post_op_attr_stream(xdr, entry->fattr);
if (IS_ERR(p))
goto out_overflow_exit;
entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
/* In fact, a post_op_fh3: */
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
goto out_overflow;
if (*p++) {
p = xdr_decode_fhandle_stream(xdr, entry->fh);
if (IS_ERR(p))
goto out_overflow_exit;
/* Ugh -- server reply was truncated */
if (p == NULL) {
dprintk("NFS: FH truncated\n");
*entry = old;
return ERR_PTR(-EAGAIN);
}
} else
memset((u8*)(entry->fh), 0, sizeof(*entry->fh));
}
p = xdr_inline_peek(xdr, 8);
if (p != NULL)
entry->eof = !p[0] && p[1];
else
entry->eof = 0;
return p;
out_overflow:
print_overflow_msg(__func__, xdr);
out_overflow_exit:
return ERR_PTR(-EAGAIN);
}
/*
* Encode COMMIT arguments
*/
static int
nfs3_xdr_commitargs(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
{
p = xdr_encode_fhandle(p, args->fh);
p = xdr_encode_hyper(p, args->offset);
*p++ = htonl(args->count);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* 3.3.21 COMMIT3args
*
* struct COMMIT3args {
* nfs_fh3 file;
* offset3 offset;
* count3 count;
* };
*/
static void encode_commit3args(struct xdr_stream *xdr,
const struct nfs_writeargs *args)
{
__be32 *p;
encode_nfs_fh3(xdr, args->fh);
p = xdr_reserve_space(xdr, 8 + 4);
p = xdr_encode_hyper(p, args->offset);
*p = cpu_to_be32(args->count);
}
static int nfs3_xdr_enc_commit3args(struct rpc_rqst *req, __be32 *p,
const struct nfs_writeargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_commit3args(&xdr, args);
return 0;
}
#ifdef CONFIG_NFS_V3_ACL
/*
* Encode GETACL arguments
*/
static int
nfs3_xdr_getaclargs(struct rpc_rqst *req, __be32 *p,
struct nfs3_getaclargs *args)
{
struct rpc_auth *auth = req->rq_cred->cr_auth;
unsigned int replen;
p = xdr_encode_fhandle(p, args->fh);
*p++ = htonl(args->mask);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
if (args->mask & (NFS_ACL | NFS_DFACL)) {
/* Inline the page array */
replen = (RPC_REPHDRSIZE + auth->au_rslack +
ACL3_getaclres_sz) << 2;
xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0,
NFSACL_MAXPAGES << PAGE_SHIFT);
}
return 0;
}
static int nfs3_xdr_enc_getacl3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_getaclargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_nfs_fh3(&xdr, args->fh);
encode_uint32(&xdr, args->mask);
if (args->mask & (NFS_ACL | NFS_DFACL))
prepare_reply_buffer(req, args->pages, 0,
NFSACL_MAXPAGES << PAGE_SHIFT,
ACL3_getaclres_sz);
return 0;
}
/*
* Encode SETACL arguments
*/
static int
nfs3_xdr_setaclargs(struct rpc_rqst *req, __be32 *p,
struct nfs3_setaclargs *args)
{
struct xdr_buf *buf = &req->rq_snd_buf;
unsigned int base;
int err;
p = xdr_encode_fhandle(p, NFS_FH(args->inode));
*p++ = htonl(args->mask);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
base = req->rq_slen;
if (args->npages != 0)
xdr_encode_pages(buf, args->pages, 0, args->len);
else
req->rq_slen = xdr_adjust_iovec(req->rq_svec,
p + XDR_QUADLEN(args->len));
err = nfsacl_encode(buf, base, args->inode,
(args->mask & NFS_ACL) ?
args->acl_access : NULL, 1, 0);
if (err > 0)
err = nfsacl_encode(buf, base + err, args->inode,
(args->mask & NFS_DFACL) ?
args->acl_default : NULL, 1,
NFS_ACL_DEFAULT);
return (err > 0) ? 0 : err;
}
static int nfs3_xdr_enc_setacl3args(struct rpc_rqst *req, __be32 *p,
const struct nfs3_setaclargs *args)
{
struct xdr_stream xdr;
unsigned int base;
int error;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_nfs_fh3(&xdr, NFS_FH(args->inode));
encode_uint32(&xdr, args->mask);
if (args->npages != 0)
xdr_write_pages(&xdr, args->pages, 0, args->len);
base = req->rq_slen;
error = nfsacl_encode(xdr.buf, base, args->inode,
(args->mask & NFS_ACL) ?
args->acl_access : NULL, 1, 0);
BUG_ON(error < 0);
error = nfsacl_encode(xdr.buf, base + error, args->inode,
(args->mask & NFS_DFACL) ?
args->acl_default : NULL, 1,
NFS_ACL_DEFAULT);
BUG_ON(error < 0);
return 0;
}
#endif /* CONFIG_NFS_V3_ACL */
/*
* NFS XDR decode functions
*/
/*
* Decode attrstat reply.
*/
static int
nfs3_xdr_attrstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
{
int status;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
xdr_decode_fattr(p, fattr);
return 0;
}
/*
* Decode status+wcc_data reply
* SATTR, REMOVE, RMDIR
*/
static int
nfs3_xdr_wccstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
{
int status;
if ((status = ntohl(*p++)))
status = nfs_stat_to_errno(status);
xdr_decode_wcc_data(p, fattr);
return status;
}
static int
nfs3_xdr_removeres(struct rpc_rqst *req, __be32 *p, struct nfs_removeres *res)
{
return nfs3_xdr_wccstat(req, p, res->dir_attr);
}
/*
* Decode LOOKUP reply
*/
static int
nfs3_xdr_lookupres(struct rpc_rqst *req, __be32 *p, struct nfs3_diropres *res)
{
int status;
if ((status = ntohl(*p++))) {
status = nfs_stat_to_errno(status);
} else {
if (!(p = xdr_decode_fhandle(p, res->fh)))
return -errno_NFSERR_IO;
p = xdr_decode_post_op_attr(p, res->fattr);
}
xdr_decode_post_op_attr(p, res->dir_attr);
return status;
}
/*
* Decode ACCESS reply
*/
static int
nfs3_xdr_accessres(struct rpc_rqst *req, __be32 *p, struct nfs3_accessres *res)
{
int status = ntohl(*p++);
p = xdr_decode_post_op_attr(p, res->fattr);
if (status)
return nfs_stat_to_errno(status);
res->access = ntohl(*p++);
return 0;
}
static int
nfs3_xdr_readlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs3_readlinkargs *args)
{
struct rpc_auth *auth = req->rq_cred->cr_auth;
unsigned int replen;
p = xdr_encode_fhandle(p, args->fh);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
/* Inline the page array */
replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readlinkres_sz) << 2;
xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, args->pgbase, args->pglen);
return 0;
}
/*
* Decode READLINK reply
*/
static int
nfs3_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct kvec *iov = rcvbuf->head;
size_t hdrlen;
u32 len, recvd;
int status;
status = ntohl(*p++);
p = xdr_decode_post_op_attr(p, fattr);
if (status != 0)
return nfs_stat_to_errno(status);
/* Convert length of symlink */
len = ntohl(*p++);
if (len >= rcvbuf->page_len) {
dprintk("nfs: server returned giant symlink!\n");
return -ENAMETOOLONG;
}
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
dprintk("NFS: READLINK reply header overflowed:"
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READLINK header is short. "
"iovec will be shifted.\n");
xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
}
recvd = req->rq_rcv_buf.len - hdrlen;
if (recvd < len) {
dprintk("NFS: server cheating in readlink reply: "
"count %u > recvd %u\n", len, recvd);
return -EIO;
}
xdr_terminate_string(rcvbuf, len);
return 0;
}
/*
* Decode READ reply
*/
static int
nfs3_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
{
struct kvec *iov = req->rq_rcv_buf.head;
size_t hdrlen;
u32 count, ocount, recvd;
int status;
status = ntohl(*p++);
p = xdr_decode_post_op_attr(p, res->fattr);
if (status != 0)
return nfs_stat_to_errno(status);
/* Decode reply count and EOF flag. NFSv3 is somewhat redundant
* in that it puts the count both in the res struct and in the
* opaque data count. */
count = ntohl(*p++);
res->eof = ntohl(*p++);
ocount = ntohl(*p++);
if (ocount != count) {
dprintk("NFS: READ count doesn't match RPC opaque count.\n");
return -errno_NFSERR_IO;
}
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
dprintk("NFS: READ reply header overflowed:"
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READ header is short. iovec will be shifted.\n");
xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen);
}
recvd = req->rq_rcv_buf.len - hdrlen;
if (count > recvd) {
dprintk("NFS: server cheating in read reply: "
"count %u > recvd %u\n", count, recvd);
count = recvd;
res->eof = 0;
}
if (count < res->count)
res->count = count;
return count;
}
/*
* Decode WRITE response
*/
static int
nfs3_xdr_writeres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
{
int status;
status = ntohl(*p++);
p = xdr_decode_wcc_data(p, res->fattr);
if (status != 0)
return nfs_stat_to_errno(status);
res->count = ntohl(*p++);
res->verf->committed = (enum nfs3_stable_how)ntohl(*p++);
res->verf->verifier[0] = *p++;
res->verf->verifier[1] = *p++;
return res->count;
}
/*
* Decode a CREATE response
*/
static int
nfs3_xdr_createres(struct rpc_rqst *req, __be32 *p, struct nfs3_diropres *res)
{
int status;
status = ntohl(*p++);
if (status == 0) {
if (*p++) {
if (!(p = xdr_decode_fhandle(p, res->fh)))
return -errno_NFSERR_IO;
p = xdr_decode_post_op_attr(p, res->fattr);
} else {
memset(res->fh, 0, sizeof(*res->fh));
/* Do decode post_op_attr but set it to NULL */
p = xdr_decode_post_op_attr(p, res->fattr);
res->fattr->valid = 0;
}
} else {
status = nfs_stat_to_errno(status);
}
p = xdr_decode_wcc_data(p, res->dir_attr);
return status;
}
/*
* Decode RENAME reply
*/
static int
nfs3_xdr_renameres(struct rpc_rqst *req, __be32 *p, struct nfs_renameres *res)
{
int status;
if ((status = ntohl(*p++)) != 0)
status = nfs_stat_to_errno(status);
p = xdr_decode_wcc_data(p, res->old_fattr);
p = xdr_decode_wcc_data(p, res->new_fattr);
return status;
}
/*
* Decode LINK reply
*/
static int
nfs3_xdr_linkres(struct rpc_rqst *req, __be32 *p, struct nfs3_linkres *res)
{
int status;
if ((status = ntohl(*p++)) != 0)
status = nfs_stat_to_errno(status);
p = xdr_decode_post_op_attr(p, res->fattr);
p = xdr_decode_wcc_data(p, res->dir_attr);
return status;
}
/*
* Decode FSSTAT reply
*/
static int
nfs3_xdr_fsstatres(struct rpc_rqst *req, __be32 *p, struct nfs_fsstat *res)
{
int status;
status = ntohl(*p++);
p = xdr_decode_post_op_attr(p, res->fattr);
if (status != 0)
return nfs_stat_to_errno(status);
p = xdr_decode_hyper(p, &res->tbytes);
p = xdr_decode_hyper(p, &res->fbytes);
p = xdr_decode_hyper(p, &res->abytes);
p = xdr_decode_hyper(p, &res->tfiles);
p = xdr_decode_hyper(p, &res->ffiles);
p = xdr_decode_hyper(p, &res->afiles);
/* ignore invarsec */
return 0;
}
/*
* Decode FSINFO reply
*/
static int
nfs3_xdr_fsinfores(struct rpc_rqst *req, __be32 *p, struct nfs_fsinfo *res)
{
int status;
status = ntohl(*p++);
p = xdr_decode_post_op_attr(p, res->fattr);
if (status != 0)
return nfs_stat_to_errno(status);
res->rtmax = ntohl(*p++);
res->rtpref = ntohl(*p++);
res->rtmult = ntohl(*p++);
res->wtmax = ntohl(*p++);
res->wtpref = ntohl(*p++);
res->wtmult = ntohl(*p++);
res->dtpref = ntohl(*p++);
p = xdr_decode_hyper(p, &res->maxfilesize);
p = xdr_decode_time3(p, &res->time_delta);
/* ignore properties */
res->lease_time = 0;
return 0;
}
/*
* Decode PATHCONF reply
*/
static int
nfs3_xdr_pathconfres(struct rpc_rqst *req, __be32 *p, struct nfs_pathconf *res)
{
int status;
status = ntohl(*p++);
p = xdr_decode_post_op_attr(p, res->fattr);
if (status != 0)
return nfs_stat_to_errno(status);
res->max_link = ntohl(*p++);
res->max_namelen = ntohl(*p++);
/* ignore remaining fields */
return 0;
}
/*
* Decode COMMIT reply
*/
static int
nfs3_xdr_commitres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
{
int status;
status = ntohl(*p++);
p = xdr_decode_wcc_data(p, res->fattr);
if (status != 0)
return nfs_stat_to_errno(status);
res->verf->verifier[0] = *p++;
res->verf->verifier[1] = *p++;
return 0;
}
#ifdef CONFIG_NFS_V3_ACL
/*
* Decode GETACL reply
*/
static int
nfs3_xdr_getaclres(struct rpc_rqst *req, __be32 *p,
struct nfs3_getaclres *res)
{
struct xdr_buf *buf = &req->rq_rcv_buf;
int status = ntohl(*p++);
struct posix_acl **acl;
unsigned int *aclcnt;
int err, base;
if (status != 0)
return nfs_stat_to_errno(status);
p = xdr_decode_post_op_attr(p, res->fattr);
res->mask = ntohl(*p++);
if (res->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
return -EINVAL;
base = (char *)p - (char *)req->rq_rcv_buf.head->iov_base;
acl = (res->mask & NFS_ACL) ? &res->acl_access : NULL;
aclcnt = (res->mask & NFS_ACLCNT) ? &res->acl_access_count : NULL;
err = nfsacl_decode(buf, base, aclcnt, acl);
acl = (res->mask & NFS_DFACL) ? &res->acl_default : NULL;
aclcnt = (res->mask & NFS_DFACLCNT) ? &res->acl_default_count : NULL;
if (err > 0)
err = nfsacl_decode(buf, base + err, aclcnt, acl);
return (err > 0) ? 0 : err;
}
/*
* Decode setacl reply.
*/
static int
nfs3_xdr_setaclres(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
{
int status = ntohl(*p++);
if (status)
return nfs_stat_to_errno(status);
xdr_decode_post_op_attr(p, fattr);
return 0;
}
#endif /* CONFIG_NFS_V3_ACL */
#define PROC(proc, argtype, restype, timer) \
[NFS3PROC_##proc] = { \
.p_proc = NFS3PROC_##proc, \
.p_encode = (kxdrproc_t)nfs3_xdr_enc_##argtype##3args, \
.p_decode = (kxdrproc_t) nfs3_xdr_##restype, \
.p_arglen = NFS3_##argtype##args_sz, \
.p_replen = NFS3_##restype##_sz, \
.p_timer = timer, \
.p_statidx = NFS3PROC_##proc, \
.p_name = #proc, \
}
struct rpc_procinfo nfs3_procedures[] = {
PROC(GETATTR, getattr, attrstat, 1),
PROC(SETATTR, setattr, wccstat, 0),
PROC(LOOKUP, lookup, lookupres, 2),
PROC(ACCESS, access, accessres, 1),
PROC(READLINK, readlink, readlinkres, 3),
PROC(READ, read, readres, 3),
PROC(WRITE, write, writeres, 4),
PROC(CREATE, create, createres, 0),
PROC(MKDIR, mkdir, createres, 0),
PROC(SYMLINK, symlink, createres, 0),
PROC(MKNOD, mknod, createres, 0),
PROC(REMOVE, remove, removeres, 0),
PROC(RMDIR, lookup, wccstat, 0),
PROC(RENAME, rename, renameres, 0),
PROC(LINK, link, linkres, 0),
PROC(READDIR, readdir, readdirres, 3),
PROC(READDIRPLUS, readdirplus, readdirres, 3),
PROC(FSSTAT, getattr, fsstatres, 0),
PROC(FSINFO, getattr, fsinfores, 0),
PROC(PATHCONF, getattr, pathconfres, 0),
PROC(COMMIT, commit, commitres, 5),
};
struct rpc_version nfs_version3 = {
.number = 3,
.nrprocs = ARRAY_SIZE(nfs3_procedures),
.procs = nfs3_procedures
};
#ifdef CONFIG_NFS_V3_ACL
static struct rpc_procinfo nfs3_acl_procedures[] = {
[ACLPROC3_GETACL] = {
.p_proc = ACLPROC3_GETACL,
.p_encode = (kxdrproc_t)nfs3_xdr_enc_getacl3args,
.p_decode = (kxdrproc_t) nfs3_xdr_getaclres,
.p_arglen = ACL3_getaclargs_sz,
.p_replen = ACL3_getaclres_sz,
.p_timer = 1,
.p_name = "GETACL",
},
[ACLPROC3_SETACL] = {
.p_proc = ACLPROC3_SETACL,
.p_encode = (kxdrproc_t)nfs3_xdr_enc_setacl3args,
.p_decode = (kxdrproc_t) nfs3_xdr_setaclres,
.p_arglen = ACL3_setaclargs_sz,
.p_replen = ACL3_setaclres_sz,
.p_timer = 0,
.p_name = "SETACL",
},
};
struct rpc_version nfsacl_version3 = {
.number = 3,
.nrprocs = sizeof(nfs3_acl_procedures)/
sizeof(nfs3_acl_procedures[0]),
.procs = nfs3_acl_procedures,
};
#endif /* CONFIG_NFS_V3_ACL */