/* * 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_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+ \ 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, }; /* * 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; 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, 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_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 = 0; __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; /* Make sure the packet actually has a value_follows and EOF entry */ if ((entry + 1) > end) goto short_pkt; for (; *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; } /* * Apparently some server sends responses that are a valid size, but * contain no entries, and have value_follows==0 and EOF==0. For * those, just set the EOF marker. */ if (!nr && entry[1] == 0) { dprintk("NFS: readdir reply truncated!\n"); entry[1] = 1; } out: kunmap_atomic(kaddr, KM_USER0); return nr; short_pkt: /* * When we get a short packet there are 2 possibilities. We can * return an error, or fix up the response to look like a valid * response and return what we have so far. If there are no * entries and the packet was short, then return -EIO. If there * are valid entries in the response, return them and pretend that * the call was successful, but incomplete. The caller can retry the * readdir starting at the last cookie. */ entry[0] = entry[1] = 0; if (!nr) nr = -errno_NFSERR_IO; 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; 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; } #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 */