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1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 | /* * 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/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> #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_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_sattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3) #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz) #define NFS3_removeargs_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_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_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+2*(2+5*3)) #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+2*(2+5*3)) #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz) /* * 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 __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; } /* * Encode/decode time. */ static inline __be32 * xdr_encode_time3(__be32 *p, 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; 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 */ 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 | NFS_ATTR_FATTR_V3); return p; } static inline __be32 * xdr_encode_sattr(__be32 *p, 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_WCC; 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_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); } /* * 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; } /* * 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; } /* * 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; } /* * 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; } /* * 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_task->tk_msg.rpc_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; } /* * 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; } /* * 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; } /* * 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; } /* * 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; } /* * 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; } /* * Encode RENAME arguments */ static int nfs3_xdr_renameargs(struct rpc_rqst *req, __be32 *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, __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; } /* * 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_task->tk_msg.rpc_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; } /* * 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 len, recvd, pglen; int status, nr; __be32 *entry, *end, *kaddr; 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; kaddr = p = kmap_atomic(*page, KM_USER0); end = (__be32 *)((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) { dprintk("NFS: giant filename in readdir (len 0x%x)!\n", len); goto err_unmap; } if (res->plus) { /* post_op_attr */ if (p + 2 > end) goto short_pkt; if (*p++) { p += 21; if (p + 1 > end) goto short_pkt; } /* post_op_fh3 */ if (*p++) { if (p + 1 > end) goto short_pkt; len = ntohl(*p++); if (len > NFS3_FHSIZE) { dprintk("NFS: giant filehandle in " "readdir (len 0x%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_atomic(kaddr, KM_USER0); return nr; short_pkt: entry[0] = entry[1] = 0; /* truncate listing ? */ if (!nr) { dprintk("NFS: readdir reply truncated!\n"); entry[1] = 1; } goto out; err_unmap: nr = -errno_NFSERR_IO; goto out; } __be32 * nfs3_decode_dirent(__be32 *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) { entry->fattr->valid = 0; 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 memset((u8*)(entry->fh), 0, sizeof(*entry->fh)); } entry->eof = !p[0] && p[1]; return p; } /* * 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; } #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_task->tk_msg.rpc_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; } /* * 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, len_in_head, len = nfsacl_size( (args->mask & NFS_ACL) ? args->acl_access : NULL, (args->mask & NFS_DFACL) ? args->acl_default : NULL); int count, err; p = xdr_encode_fhandle(p, NFS_FH(args->inode)); *p++ = htonl(args->mask); base = (char *)p - (char *)buf->head->iov_base; /* put as much of the acls into head as possible. */ len_in_head = min_t(unsigned int, buf->head->iov_len - base, len); len -= len_in_head; req->rq_slen = xdr_adjust_iovec(req->rq_svec, p + (len_in_head >> 2)); for (count = 0; (count << PAGE_SHIFT) < len; count++) { args->pages[count] = alloc_page(GFP_KERNEL); if (!args->pages[count]) { while (count) __free_page(args->pages[--count]); return -ENOMEM; } } xdr_encode_pages(buf, args->pages, 0, 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; } #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_task->tk_msg.rpc_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; char *kaddr; 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; } /* NULL terminate the string we got */ kaddr = (char*)kmap_atomic(rcvbuf->pages[0], KM_USER0); kaddr[len+rcvbuf->page_base] = '\0'; kunmap_atomic(kaddr, KM_USER0); 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 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, __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); /* ignore time_delta and 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_##argtype, \ .p_decode = (kxdrproc_t) nfs3_xdr_##restype, \ .p_arglen = NFS3_##argtype##_sz, \ .p_replen = NFS3_##restype##_sz, \ .p_timer = timer, \ .p_statidx = NFS3PROC_##proc, \ .p_name = #proc, \ } struct rpc_procinfo nfs3_procedures[] = { 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, removeargs, removeres, 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 = { .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_getaclargs, .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_setaclargs, .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 */ |