| /* |
| * 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> |
| |
| /* Uncomment this to support servers requiring longword lengths */ |
| #define NFS_PAD_WRITES 1 |
| |
| #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 inline u32 * |
| xdr_decode_string2(u32 *p, char **string, unsigned int *len, |
| unsigned int maxlen) |
| { |
| *len = ntohl(*p++); |
| if (*len > maxlen) |
| return NULL; |
| *string = (char *) p; |
| return p + XDR_QUADLEN(*len); |
| } |
| |
| static inline 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; |
| int buflen, replen; |
| unsigned int nr; |
| |
| 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); |
| |
| /* Get the number of buffers in the receive iovec */ |
| nr = args->nriov; |
| |
| if (nr+2 > MAX_IOVEC) { |
| printk(KERN_ERR "NFS: Bad number of iov's in xdr_readargs\n"); |
| return -EINVAL; |
| } |
| |
| /* set up reply iovec */ |
| replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readres_sz) << 2; |
| buflen = req->rq_rvec[0].iov_len; |
| req->rq_rvec[0].iov_len = replen; |
| |
| /* Copy the iovec */ |
| memcpy(req->rq_rvec + 1, args->iov, nr * sizeof(struct iovec)); |
| |
| req->rq_rvec[nr+1].iov_base = (u8 *) req->rq_rvec[0].iov_base + replen; |
| req->rq_rvec[nr+1].iov_len = buflen - replen; |
| req->rq_rlen = args->count + buflen; |
| req->rq_rnr += nr+1; |
| |
| 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) |
| { |
| unsigned int nr; |
| 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); |
| req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); |
| |
| /* Get the number of buffers in the send iovec */ |
| nr = args->nriov; |
| |
| if (nr+2 > MAX_IOVEC) { |
| printk(KERN_ERR "NFS: Bad number of iov's in xdr_writeargs\n"); |
| return -EINVAL; |
| } |
| |
| /* Copy the iovec */ |
| memcpy(req->rq_svec + 1, args->iov, nr * sizeof(struct iovec)); |
| |
| #ifdef NFS_PAD_WRITES |
| /* |
| * Some old servers require that the message length |
| * be a multiple of 4, so we pad it here if needed. |
| */ |
| if (count & 3) { |
| struct iovec *iov = req->rq_svec + nr + 1; |
| int pad = 4 - (count & 3); |
| |
| iov->iov_base = (void *) "\0\0\0"; |
| iov->iov_len = pad; |
| count += pad; |
| nr++; |
| } |
| #endif |
| req->rq_slen += count; |
| req->rq_snr += nr; |
| |
| 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; |
| int buflen, replen; |
| |
| 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(args->bufsiz >> 3); |
| } |
| *p++ = htonl(args->bufsiz); |
| req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); |
| |
| /* set up reply iovec */ |
| replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readdirres_sz) << 2; |
| buflen = req->rq_rvec[0].iov_len; |
| req->rq_rvec[0].iov_len = replen; |
| req->rq_rvec[1].iov_base = args->buffer; |
| req->rq_rvec[1].iov_len = args->bufsiz; |
| req->rq_rvec[2].iov_base = (u8 *) req->rq_rvec[0].iov_base + replen; |
| req->rq_rvec[2].iov_len = buflen - replen; |
| req->rq_rlen = buflen + args->bufsiz; |
| req->rq_rnr += 2; |
| |
| 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 iovec *iov = req->rq_rvec; |
| int hdrlen; |
| int status, nr; |
| unsigned int len; |
| 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) { |
| dprintk("NFS: READDIR header is short. iovec will be shifted.\n"); |
| xdr_shift_iovec(iov, req->rq_rnr, iov->iov_len - hdrlen); |
| } |
| |
| p = (u32 *) iov[1].iov_base; |
| end = (u32 *) ((u8 *) p + iov[1].iov_len); |
| for (nr = 0; *p++; nr++) { |
| entry = p - 1; |
| 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); |
| return -errno_NFSERR_IO; |
| } |
| |
| 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); |
| return -errno_NFSERR_IO; |
| } |
| p += XDR_QUADLEN(len); |
| } |
| } |
| |
| if (p + 2 > end) |
| goto short_pkt; |
| } |
| |
| return nr; |
| short_pkt: |
| printk(KERN_NOTICE "NFS: short packet in readdir reply!\n"); |
| /* truncate listing */ |
| entry[0] = entry[1] = 0; |
| return nr; |
| } |
| |
| 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 truncated\n"); |
| *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_task *task = req->rq_task; |
| struct rpc_auth *auth = task->tk_auth; |
| int buflen, replen; |
| |
| p = xdr_encode_fhandle(p, args->fh); |
| req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); |
| replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readlinkres_sz) << 2; |
| buflen = req->rq_rvec[0].iov_len; |
| req->rq_rvec[0].iov_len = replen; |
| req->rq_rvec[1].iov_base = args->buffer; |
| req->rq_rvec[1].iov_len = args->bufsiz; |
| req->rq_rvec[2].iov_base = (u8 *) req->rq_rvec[0].iov_base + replen; |
| req->rq_rvec[2].iov_len = buflen - replen; |
| req->rq_rlen = buflen + args->bufsiz; |
| req->rq_rnr += 2; |
| return 0; |
| } |
| |
| /* |
| * Decode READLINK reply |
| */ |
| static int |
| nfs3_xdr_readlinkres(struct rpc_rqst *req, u32 *p, struct nfs3_readlinkres *res) |
| { |
| struct iovec *iov = req->rq_rvec; |
| int hdrlen; |
| u32 *strlen; |
| char *string; |
| int status; |
| unsigned int len; |
| |
| status = ntohl(*p++); |
| p = xdr_decode_post_op_attr(p, res->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_iovec(iov, req->rq_rnr, iov->iov_len - hdrlen); |
| } |
| |
| strlen = (u32*)res->buffer; |
| /* Convert length of symlink */ |
| len = ntohl(*strlen); |
| if (len > res->bufsiz - 5) |
| len = res->bufsiz - 5; |
| *strlen = len; |
| /* NULL terminate the string we got */ |
| string = (char *)(strlen + 1); |
| string[len] = 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) { |
| dprintk("NFS: READ header is short. iovec will be shifted.\n"); |
| xdr_shift_iovec(iov, req->rq_rnr, iov->iov_len - hdrlen); |
| } |
| |
| recvd = req->rq_rlen - hdrlen; |
| if (count > recvd) { |
| printk(KERN_WARNING "NFS: server cheating in read reply: " |
| "count %d > recvd %d\n", count, recvd); |
| count = recvd; |
| } |
| |
| if (count < res->count) { |
| xdr_zero_iovec(iov+1, req->rq_rnr-2, res->count - 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) \ |
| { "nfs3_" #proc, \ |
| (kxdrproc_t) nfs3_xdr_##argtype, \ |
| (kxdrproc_t) nfs3_xdr_##restype, \ |
| MAX(NFS3_##argtype##_sz,NFS3_##restype##_sz) << 2, \ |
| 0 \ |
| } |
| |
| static struct rpc_procinfo nfs3_procedures[22] = { |
| PROC(null, enc_void, dec_void), |
| PROC(getattr, fhandle, attrstat), |
| PROC(setattr, sattrargs, wccstat), |
| PROC(lookup, diropargs, lookupres), |
| PROC(access, accessargs, accessres), |
| PROC(readlink, readlinkargs, readlinkres), |
| PROC(read, readargs, readres), |
| PROC(write, writeargs, writeres), |
| PROC(create, createargs, createres), |
| PROC(mkdir, mkdirargs, createres), |
| PROC(symlink, symlinkargs, createres), |
| PROC(mknod, mknodargs, createres), |
| PROC(remove, diropargs, wccstat), |
| PROC(rmdir, diropargs, wccstat), |
| PROC(rename, renameargs, renameres), |
| PROC(link, linkargs, linkres), |
| PROC(readdir, readdirargs, readdirres), |
| PROC(readdirplus, readdirargs, readdirres), |
| PROC(fsstat, fhandle, fsstatres), |
| PROC(fsinfo, fhandle, fsinfores), |
| PROC(pathconf, fhandle, pathconfres), |
| PROC(commit, commitargs, commitres), |
| }; |
| |
| struct rpc_version nfs_version3 = { |
| 3, |
| sizeof(nfs3_procedures)/sizeof(nfs3_procedures[0]), |
| nfs3_procedures |
| }; |
| |