nfs3xdr.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:24k
- /*
- * 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/sched.h>
- #include <linux/mm.h>
- #include <linux/slab.h>
- #include <linux/utsname.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>
- #define NFSDBG_FACILITY NFSDBG_XDR
- /* Mapping from NFS error code to "errno" error code. */
- #define errno_NFSERR_IO EIO
- extern int nfs_stat_to_errno(int);
- /*
- * 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_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_enc_void_sz 0
- #define NFS3_sattrargs_sz NFS3_fh_sz+NFS3_sattr_sz+3
- #define NFS3_diropargs_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+NFS3_path_sz+NFS3_sattr_sz
- #define NFS3_mknodargs_sz NFS3_diropargs_sz+2+NFS3_sattr_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+2
- #define NFS3_commitargs_sz NFS3_fh_sz+3
- #define NFS3_dec_void_sz 0
- #define NFS3_attrstat_sz 1+NFS3_fattr_sz
- #define NFS3_wccstat_sz 1+NFS3_wcc_data_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
- #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
- /*
- * Map file type to S_IFMT bits
- */
- static struct {
- unsigned int mode;
- unsigned int nfs2type;
- } nfs_type2fmt[] = {
- { 0, NFNON },
- { S_IFREG, NFREG },
- { S_IFDIR, NFDIR },
- { S_IFBLK, NFBLK },
- { S_IFCHR, NFCHR },
- { S_IFLNK, NFLNK },
- { S_IFSOCK, NFSOCK },
- { S_IFIFO, NFFIFO },
- { 0, NFBAD }
- };
- /*
- * Common NFS XDR functions as inlines
- */
- static inline u32 *
- xdr_encode_fhandle(u32 *p, struct nfs_fh *fh)
- {
- *p++ = htonl(fh->size);
- memcpy(p, fh->data, fh->size);
- return p + XDR_QUADLEN(fh->size);
- }
- static inline u32 *
- xdr_decode_fhandle(u32 *p, struct nfs_fh *fh)
- {
- /*
- * Zero all nonused bytes
- */
- memset((u8 *)fh, 0, sizeof(*fh));
- if ((fh->size = ntohl(*p++)) <= NFS3_FHSIZE) {
- memcpy(fh->data, p, fh->size);
- return p + XDR_QUADLEN(fh->size);
- }
- return NULL;
- }
- /*
- * Encode/decode time.
- * Since the VFS doesn't care for fractional times, we ignore the
- * nanosecond field.
- */
- static inline u32 *
- xdr_encode_time(u32 *p, time_t time)
- {
- *p++ = htonl(time);
- *p++ = 0;
- return p;
- }
- static inline u32 *
- xdr_decode_time3(u32 *p, u64 *timep)
- {
- u64 tmp = (u64)ntohl(*p++) << 32;
- *timep = tmp + (u64)ntohl(*p++);
- return p;
- }
- static inline u32 *
- xdr_encode_time3(u32 *p, u64 time)
- {
- *p++ = htonl(time >> 32);
- *p++ = htonl(time & 0xFFFFFFFF);
- return p;
- }
- static u32 *
- xdr_decode_fattr(u32 *p, struct nfs_fattr *fattr)
- {
- unsigned int type;
- int fmode;
- type = ntohl(*p++);
- if (type >= NF3BAD)
- type = NF3BAD;
- fmode = nfs_type2fmt[type].mode;
- fattr->type = nfs_type2fmt[type].nfs2type;
- 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 */
- fattr->rdev = ntohl(*p++) << MINORBITS;
- fattr->rdev |= ntohl(*p++) & MINORMASK;
- p = xdr_decode_hyper(p, &fattr->fsid);
- 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 | NFS_ATTR_FATTR_V3);
- return p;
- }
- static inline u32 *
- xdr_encode_sattr(u32 *p, struct iattr *attr)
- {
- if (attr->ia_valid & ATTR_MODE) {
- *p++ = xdr_one;
- *p++ = htonl(attr->ia_mode);
- } 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_time(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_time(p, attr->ia_mtime);
- } else if (attr->ia_valid & ATTR_MTIME) {
- *p++ = xdr_one;
- } else {
- *p++ = xdr_zero;
- }
- return p;
- }
- static inline u32 *
- xdr_decode_wcc_attr(u32 *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_WCC;
- return p;
- }
- static inline u32 *
- xdr_decode_post_op_attr(u32 *p, struct nfs_fattr *fattr)
- {
- if (*p++)
- p = xdr_decode_fattr(p, fattr);
- return p;
- }
- static inline u32 *
- xdr_decode_pre_op_attr(u32 *p, struct nfs_fattr *fattr)
- {
- if (*p++)
- return xdr_decode_wcc_attr(p, fattr);
- return p;
- }
- static inline u32 *
- xdr_decode_wcc_data(u32 *p, struct nfs_fattr *fattr)
- {
- p = xdr_decode_pre_op_attr(p, fattr);
- return xdr_decode_post_op_attr(p, fattr);
- }
- /*
- * NFS encode functions
- */
- /*
- * Encode void argument
- */
- static int
- nfs3_xdr_enc_void(struct rpc_rqst *req, u32 *p, void *dummy)
- {
- req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
- return 0;
- }
- /*
- * Encode file handle argument
- */
- static int
- nfs3_xdr_fhandle(struct rpc_rqst *req, u32 *p, struct nfs_fh *fh)
- {
- p = xdr_encode_fhandle(p, fh);
- req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
- return 0;
- }
- /*
- * Encode SETATTR arguments
- */
- static int
- nfs3_xdr_sattrargs(struct rpc_rqst *req, u32 *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;
- }
- /*
- * Encode directory ops argument
- */
- static int
- nfs3_xdr_diropargs(struct rpc_rqst *req, u32 *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;
- }
- /*
- * Encode access() argument
- */
- static int
- nfs3_xdr_accessargs(struct rpc_rqst *req, u32 *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;
- }
- /*
- * 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, u32 *p, struct nfs_readargs *args)
- {
- struct rpc_auth *auth = req->rq_task->tk_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);
- return 0;
- }
- /*
- * Write arguments. Splice the buffer to be written into the iovec.
- */
- static int
- nfs3_xdr_writeargs(struct rpc_rqst *req, u32 *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);
- return 0;
- }
- /*
- * Encode CREATE arguments
- */
- static int
- nfs3_xdr_createargs(struct rpc_rqst *req, u32 *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;
- }
- /*
- * Encode MKDIR arguments
- */
- static int
- nfs3_xdr_mkdirargs(struct rpc_rqst *req, u32 *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;
- }
- /*
- * Encode SYMLINK arguments
- */
- static int
- nfs3_xdr_symlinkargs(struct rpc_rqst *req, u32 *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 = xdr_encode_array(p, args->topath, args->tolen);
- req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
- return 0;
- }
- /*
- * Encode MKNOD arguments
- */
- static int
- nfs3_xdr_mknodargs(struct rpc_rqst *req, u32 *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(args->rdev >> MINORBITS);
- *p++ = htonl(args->rdev & MINORMASK);
- }
- req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
- return 0;
- }
- /*
- * Encode RENAME arguments
- */
- static int
- nfs3_xdr_renameargs(struct rpc_rqst *req, u32 *p, struct nfs3_renameargs *args)
- {
- p = xdr_encode_fhandle(p, args->fromfh);
- p = xdr_encode_array(p, args->fromname, args->fromlen);
- 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;
- }
- /*
- * Encode LINK arguments
- */
- static int
- nfs3_xdr_linkargs(struct rpc_rqst *req, u32 *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;
- }
- /*
- * Encode arguments to readdir call
- */
- static int
- nfs3_xdr_readdirargs(struct rpc_rqst *req, u32 *p, struct nfs3_readdirargs *args)
- {
- struct rpc_auth *auth = req->rq_task->tk_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;
- }
- /*
- * Decode the result of a readdir call.
- * We just check for syntactical correctness.
- */
- static int
- nfs3_xdr_readdirres(struct rpc_rqst *req, u32 *p, struct nfs3_readdirres *res)
- {
- struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
- struct iovec *iov = rcvbuf->head;
- struct page **page;
- int hdrlen, recvd;
- int status, nr;
- unsigned int len, pglen;
- u32 *entry, *end;
- 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) {
- printk(KERN_WARNING "NFS: READDIR reply header overflowed:"
- "length %d > %Zun", 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 = req->rq_received - hdrlen;
- if (pglen > recvd)
- pglen = recvd;
- page = rcvbuf->pages;
- p = kmap(*page);
- end = (u32 *)((char *)p + pglen);
- entry = p;
- for (nr = 0; *p++; nr++) {
- if (p + 3 > end)
- goto short_pkt;
- p += 2; /* inode # */
- len = ntohl(*p++); /* string length */
- p += XDR_QUADLEN(len) + 2; /* name + cookie */
- if (len > NFS3_MAXNAMLEN) {
- printk(KERN_WARNING "NFS: giant filename in readdir (len %x)!n",
- len);
- goto err_unmap;
- }
- if (res->plus) {
- /* post_op_attr */
- if (p > end)
- goto short_pkt;
- if (*p++) {
- p += 21;
- if (p > end)
- goto short_pkt;
- }
- /* post_op_fh3 */
- if (*p++) {
- if (p > end)
- goto short_pkt;
- len = ntohl(*p++);
- if (len > NFS3_FHSIZE) {
- printk(KERN_WARNING "NFS: giant filehandle in "
- "readdir (len %x)!n", len);
- goto err_unmap;
- }
- p += XDR_QUADLEN(len);
- }
- }
- if (p + 2 > end)
- goto short_pkt;
- entry = p;
- }
- if (!nr && (entry[0] != 0 || entry[1] == 0))
- goto short_pkt;
- out:
- kunmap(*page);
- return nr;
- short_pkt:
- entry[0] = entry[1] = 0;
- /* truncate listing ? */
- if (!nr) {
- printk(KERN_NOTICE "NFS: readdir reply truncated!n");
- entry[1] = 1;
- }
- goto out;
- err_unmap:
- kunmap(*page);
- return -errno_NFSERR_IO;
- }
- u32 *
- nfs3_decode_dirent(u32 *p, struct nfs_entry *entry, int plus)
- {
- struct nfs_entry old = *entry;
- if (!*p++) {
- if (!*p)
- return ERR_PTR(-EAGAIN);
- entry->eof = 1;
- return ERR_PTR(-EBADCOOKIE);
- }
- p = xdr_decode_hyper(p, &entry->ino);
- entry->len = ntohl(*p++);
- entry->name = (const char *) p;
- p += XDR_QUADLEN(entry->len);
- entry->prev_cookie = entry->cookie;
- p = xdr_decode_hyper(p, &entry->cookie);
- if (plus) {
- p = xdr_decode_post_op_attr(p, &entry->fattr);
- /* In fact, a post_op_fh3: */
- if (*p++) {
- p = xdr_decode_fhandle(p, &entry->fh);
- /* Ugh -- server reply was truncated */
- if (p == NULL) {
- dprintk("NFS: FH truncatedn");
- *entry = old;
- return ERR_PTR(-EAGAIN);
- }
- } else {
- /* If we don't get a file handle, the attrs
- * aren't worth a lot. */
- entry->fattr.valid = 0;
- }
- }
- entry->eof = !p[0] && p[1];
- return p;
- }
- /*
- * Encode COMMIT arguments
- */
- static int
- nfs3_xdr_commitargs(struct rpc_rqst *req, u32 *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;
- }
- /*
- * NFS XDR decode functions
- */
- /*
- * Decode void reply
- */
- static int
- nfs3_xdr_dec_void(struct rpc_rqst *req, u32 *p, void *dummy)
- {
- return 0;
- }
- /*
- * Decode attrstat reply.
- */
- static int
- nfs3_xdr_attrstat(struct rpc_rqst *req, u32 *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, u32 *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;
- }
- /*
- * Decode LOOKUP reply
- */
- static int
- nfs3_xdr_lookupres(struct rpc_rqst *req, u32 *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, u32 *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, u32 *p, struct nfs3_readlinkargs *args)
- {
- struct rpc_auth *auth = req->rq_task->tk_auth;
- unsigned int replen;
- u32 count = args->count - 4;
- 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, 0, count);
- return 0;
- }
- /*
- * Decode READLINK reply
- */
- static int
- nfs3_xdr_readlinkres(struct rpc_rqst *req, u32 *p, struct nfs_fattr *fattr)
- {
- struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
- struct iovec *iov = rcvbuf->head;
- unsigned int hdrlen;
- u32 *strlen, len;
- char *string;
- int status;
- status = ntohl(*p++);
- p = xdr_decode_post_op_attr(p, fattr);
- if (status != 0)
- return -nfs_stat_to_errno(status);
- hdrlen = (u8 *) p - (u8 *) iov->iov_base;
- if (iov->iov_len > hdrlen) {
- dprintk("NFS: READLINK header is short. iovec will be shifted.n");
- xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
- }
- strlen = (u32*)kmap(rcvbuf->pages[0]);
- /* Convert length of symlink */
- len = ntohl(*strlen);
- if (len > rcvbuf->page_len)
- len = rcvbuf->page_len;
- *strlen = len;
- /* NULL terminate the string we got */
- string = (char *)(strlen + 1);
- string[len] = 0;
- kunmap(rcvbuf->pages[0]);
- return 0;
- }
- /*
- * Decode READ reply
- */
- static int
- nfs3_xdr_readres(struct rpc_rqst *req, u32 *p, struct nfs_readres *res)
- {
- struct iovec *iov = req->rq_rvec;
- int status, count, ocount, recvd, hdrlen;
- status = ntohl(*p++);
- p = xdr_decode_post_op_attr(p, res->fattr);
- if (status != 0)
- return -nfs_stat_to_errno(status);
- /* Decode reply could 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) {
- printk(KERN_WARNING "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) {
- printk(KERN_WARNING "NFS: READ reply header overflowed:"
- "length %d > %Zun", 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_received - hdrlen;
- if (count > recvd) {
- printk(KERN_WARNING "NFS: server cheating in read reply: "
- "count %d > recvd %dn", 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, u32 *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, u32 *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, u32 *p, struct nfs3_renameres *res)
- {
- int status;
- if ((status = ntohl(*p++)) != 0)
- status = -nfs_stat_to_errno(status);
- p = xdr_decode_wcc_data(p, res->fromattr);
- p = xdr_decode_wcc_data(p, res->toattr);
- return status;
- }
- /*
- * Decode LINK reply
- */
- static int
- nfs3_xdr_linkres(struct rpc_rqst *req, u32 *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, u32 *p, struct nfs_fsinfo *res)
- {
- struct nfs_fattr dummy;
- int status;
- status = ntohl(*p++);
- p = xdr_decode_post_op_attr(p, &dummy);
- 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, u32 *p, struct nfs_fsinfo *res)
- {
- struct nfs_fattr dummy;
- int status;
- status = ntohl(*p++);
- p = xdr_decode_post_op_attr(p, &dummy);
- 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);
- /* ignore time_delta and properties */
- return 0;
- }
- /*
- * Decode PATHCONF reply
- */
- static int
- nfs3_xdr_pathconfres(struct rpc_rqst *req, u32 *p, struct nfs_fsinfo *res)
- {
- struct nfs_fattr dummy;
- int status;
- status = ntohl(*p++);
- p = xdr_decode_post_op_attr(p, &dummy);
- if (status != 0)
- return -nfs_stat_to_errno(status);
- res->linkmax = ntohl(*p++);
- res->namelen = ntohl(*p++);
- /* ignore remaining fields */
- return 0;
- }
- /*
- * Decode COMMIT reply
- */
- static int
- nfs3_xdr_commitres(struct rpc_rqst *req, u32 *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;
- }
- #ifndef MAX
- # define MAX(a, b) (((a) > (b))? (a) : (b))
- #endif
- #define PROC(proc, argtype, restype, timer)
- { .p_procname = "nfs3_" #proc,
- .p_encode = (kxdrproc_t) nfs3_xdr_##argtype,
- .p_decode = (kxdrproc_t) nfs3_xdr_##restype,
- .p_bufsiz = MAX(NFS3_##argtype##_sz,NFS3_##restype##_sz) << 2,
- .p_timer = timer
- }
- static struct rpc_procinfo nfs3_procedures[22] = {
- PROC(null, enc_void, dec_void, 0),
- PROC(getattr, fhandle, attrstat, 1),
- PROC(setattr, sattrargs, wccstat, 0),
- PROC(lookup, diropargs, lookupres, 2),
- PROC(access, accessargs, accessres, 1),
- PROC(readlink, readlinkargs, readlinkres, 3),
- PROC(read, readargs, readres, 3),
- PROC(write, writeargs, writeres, 4),
- PROC(create, createargs, createres, 0),
- PROC(mkdir, mkdirargs, createres, 0),
- PROC(symlink, symlinkargs, createres, 0),
- PROC(mknod, mknodargs, createres, 0),
- PROC(remove, diropargs, wccstat, 0),
- PROC(rmdir, diropargs, wccstat, 0),
- PROC(rename, renameargs, renameres, 0),
- PROC(link, linkargs, linkres, 0),
- PROC(readdir, readdirargs, readdirres, 3),
- PROC(readdirplus, readdirargs, readdirres, 3),
- PROC(fsstat, fhandle, fsstatres, 0),
- PROC(fsinfo, fhandle, fsinfores, 0),
- PROC(pathconf, fhandle, pathconfres, 0),
- PROC(commit, commitargs, commitres, 5),
- };
- struct rpc_version nfs_version3 = {
- 3,
- sizeof(nfs3_procedures)/sizeof(nfs3_procedures[0]),
- nfs3_procedures
- };