/* * linux/fs/nfsd/xdr.c * * XDR support for nfsd * * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */ #include <linux/types.h> #include <linux/time.h> #include <linux/nfs.h> #include <linux/vfs.h> #include <linux/sunrpc/xdr.h> #include <linux/sunrpc/svc.h> #include <linux/nfsd/nfsd.h> #include <linux/nfsd/xdr.h> #include <linux/mm.h> #define NFSDDBG_FACILITY NFSDDBG_XDR #ifdef NFSD_OPTIMIZE_SPACE # define inline #endif /* * Mapping of S_IF* types to NFS file types */ static u32 nfs_ftypes[] = { NFNON, NFCHR, NFCHR, NFBAD, NFDIR, NFBAD, NFBLK, NFBAD, NFREG, NFBAD, NFLNK, NFBAD, NFSOCK, NFBAD, NFLNK, NFBAD, }; /* * XDR functions for basic NFS types */ static u32 * decode_fh(u32 *p, struct svc_fh *fhp) { fh_init(fhp, NFS_FHSIZE); memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE); fhp->fh_handle.fh_size = NFS_FHSIZE; /* FIXME: Look up export pointer here and verify * Sun Secure RPC if requested */ return p + (NFS_FHSIZE >> 2); } /* Helper function for NFSv2 ACL code */ u32 *nfs2svc_decode_fh(u32 *p, struct svc_fh *fhp) { return decode_fh(p, fhp); } static inline u32 * encode_fh(u32 *p, struct svc_fh *fhp) { memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE); return p + (NFS_FHSIZE>> 2); } /* * Decode a file name and make sure that the path contains * no slashes or null bytes. */ static inline u32 * decode_filename(u32 *p, char **namp, int *lenp) { char *name; int i; if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) { for (i = 0, name = *namp; i < *lenp; i++, name++) { if (*name == '\0' || *name == '/') return NULL; } } return p; } static inline u32 * decode_pathname(u32 *p, char **namp, int *lenp) { char *name; int i; if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) { for (i = 0, name = *namp; i < *lenp; i++, name++) { if (*name == '\0') return NULL; } } return p; } static inline u32 * decode_sattr(u32 *p, struct iattr *iap) { u32 tmp, tmp1; iap->ia_valid = 0; /* Sun client bug compatibility check: some sun clients seem to * put 0xffff in the mode field when they mean 0xffffffff. * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah. */ if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) { iap->ia_valid |= ATTR_MODE; iap->ia_mode = tmp; } if ((tmp = ntohl(*p++)) != (u32)-1) { iap->ia_valid |= ATTR_UID; iap->ia_uid = tmp; } if ((tmp = ntohl(*p++)) != (u32)-1) { iap->ia_valid |= ATTR_GID; iap->ia_gid = tmp; } if ((tmp = ntohl(*p++)) != (u32)-1) { iap->ia_valid |= ATTR_SIZE; iap->ia_size = tmp; } tmp = ntohl(*p++); tmp1 = ntohl(*p++); if (tmp != (u32)-1 && tmp1 != (u32)-1) { iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; iap->ia_atime.tv_sec = tmp; iap->ia_atime.tv_nsec = tmp1 * 1000; } tmp = ntohl(*p++); tmp1 = ntohl(*p++); if (tmp != (u32)-1 && tmp1 != (u32)-1) { iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; iap->ia_mtime.tv_sec = tmp; iap->ia_mtime.tv_nsec = tmp1 * 1000; /* * Passing the invalid value useconds=1000000 for mtime * is a Sun convention for "set both mtime and atime to * current server time". It's needed to make permissions * checks for the "touch" program across v2 mounts to * Solaris and Irix boxes work correctly. See description of * sattr in section 6.1 of "NFS Illustrated" by * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5 */ if (tmp1 == 1000000) iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET); } return p; } static u32 * encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp, struct kstat *stat) { struct dentry *dentry = fhp->fh_dentry; int type; struct timespec time; type = (stat->mode & S_IFMT); *p++ = htonl(nfs_ftypes[type >> 12]); *p++ = htonl((u32) stat->mode); *p++ = htonl((u32) stat->nlink); *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid)); *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid)); if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) { *p++ = htonl(NFS_MAXPATHLEN); } else { *p++ = htonl((u32) stat->size); } *p++ = htonl((u32) stat->blksize); if (S_ISCHR(type) || S_ISBLK(type)) *p++ = htonl(new_encode_dev(stat->rdev)); else *p++ = htonl(0xffffffff); *p++ = htonl((u32) stat->blocks); if (is_fsid(fhp, rqstp->rq_reffh)) *p++ = htonl((u32) fhp->fh_export->ex_fsid); else *p++ = htonl(new_encode_dev(stat->dev)); *p++ = htonl((u32) stat->ino); *p++ = htonl((u32) stat->atime.tv_sec); *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0); lease_get_mtime(dentry->d_inode, &time); *p++ = htonl((u32) time.tv_sec); *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); *p++ = htonl((u32) stat->ctime.tv_sec); *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0); return p; } /* Helper function for NFSv2 ACL code */ u32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) { struct kstat stat; vfs_getattr(fhp->fh_export->ex_mnt, fhp->fh_dentry, &stat); return encode_fattr(rqstp, p, fhp, &stat); } /* * XDR decode functions */ int nfssvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy) { return xdr_argsize_check(rqstp, p); } int nfssvc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args) { if (!(p = decode_fh(p, &args->fh))) return 0; return xdr_argsize_check(rqstp, p); } int nfssvc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_sattrargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_sattr(p, &args->attrs))) return 0; return xdr_argsize_check(rqstp, p); } int nfssvc_decode_diropargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_diropargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_filename(p, &args->name, &args->len))) return 0; return xdr_argsize_check(rqstp, p); } int nfssvc_decode_readargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_readargs *args) { unsigned int len; int v,pn; if (!(p = decode_fh(p, &args->fh))) return 0; args->offset = ntohl(*p++); len = args->count = ntohl(*p++); p++; /* totalcount - unused */ if (len > NFSSVC_MAXBLKSIZE) len = NFSSVC_MAXBLKSIZE; /* set up somewhere to store response. * We take pages, put them on reslist and include in iovec */ v=0; while (len > 0) { pn=rqstp->rq_resused; svc_take_page(rqstp); args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]); args->vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE; len -= args->vec[v].iov_len; v++; } args->vlen = v; return xdr_argsize_check(rqstp, p); } int nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_writeargs *args) { unsigned int len; int v; if (!(p = decode_fh(p, &args->fh))) return 0; p++; /* beginoffset */ args->offset = ntohl(*p++); /* offset */ p++; /* totalcount */ len = args->len = ntohl(*p++); args->vec[0].iov_base = (void*)p; args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - (((void*)p) - rqstp->rq_arg.head[0].iov_base); if (len > NFSSVC_MAXBLKSIZE) len = NFSSVC_MAXBLKSIZE; v = 0; while (len > args->vec[v].iov_len) { len -= args->vec[v].iov_len; v++; args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]); args->vec[v].iov_len = PAGE_SIZE; } args->vec[v].iov_len = len; args->vlen = v+1; return args->vec[0].iov_len > 0; } int nfssvc_decode_createargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_createargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_filename(p, &args->name, &args->len)) || !(p = decode_sattr(p, &args->attrs))) return 0; return xdr_argsize_check(rqstp, p); } int nfssvc_decode_renameargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_renameargs *args) { if (!(p = decode_fh(p, &args->ffh)) || !(p = decode_filename(p, &args->fname, &args->flen)) || !(p = decode_fh(p, &args->tfh)) || !(p = decode_filename(p, &args->tname, &args->tlen))) return 0; return xdr_argsize_check(rqstp, p); } int nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_readlinkargs *args) { if (!(p = decode_fh(p, &args->fh))) return 0; svc_take_page(rqstp); args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); return xdr_argsize_check(rqstp, p); } int nfssvc_decode_linkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_linkargs *args) { if (!(p = decode_fh(p, &args->ffh)) || !(p = decode_fh(p, &args->tfh)) || !(p = decode_filename(p, &args->tname, &args->tlen))) return 0; return xdr_argsize_check(rqstp, p); } int nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_symlinkargs *args) { if (!(p = decode_fh(p, &args->ffh)) || !(p = decode_filename(p, &args->fname, &args->flen)) || !(p = decode_pathname(p, &args->tname, &args->tlen)) || !(p = decode_sattr(p, &args->attrs))) return 0; return xdr_argsize_check(rqstp, p); } int nfssvc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_readdirargs *args) { if (!(p = decode_fh(p, &args->fh))) return 0; args->cookie = ntohl(*p++); args->count = ntohl(*p++); if (args->count > PAGE_SIZE) args->count = PAGE_SIZE; svc_take_page(rqstp); args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); return xdr_argsize_check(rqstp, p); } /* * XDR encode functions */ int nfssvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy) { return xdr_ressize_check(rqstp, p); } int nfssvc_encode_attrstat(struct svc_rqst *rqstp, u32 *p, struct nfsd_attrstat *resp) { p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); return xdr_ressize_check(rqstp, p); } int nfssvc_encode_diropres(struct svc_rqst *rqstp, u32 *p, struct nfsd_diropres *resp) { p = encode_fh(p, &resp->fh); p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); return xdr_ressize_check(rqstp, p); } int nfssvc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p, struct nfsd_readlinkres *resp) { *p++ = htonl(resp->len); xdr_ressize_check(rqstp, p); rqstp->rq_res.page_len = resp->len; if (resp->len & 3) { /* need to pad the tail */ rqstp->rq_restailpage = 0; rqstp->rq_res.tail[0].iov_base = p; *p = 0; rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); } return 1; } int nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p, struct nfsd_readres *resp) { p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); *p++ = htonl(resp->count); xdr_ressize_check(rqstp, p); /* now update rqstp->rq_res to reflect data aswell */ rqstp->rq_res.page_len = resp->count; if (resp->count & 3) { /* need to pad the tail */ rqstp->rq_restailpage = 0; rqstp->rq_res.tail[0].iov_base = p; *p = 0; rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3); } return 1; } int nfssvc_encode_readdirres(struct svc_rqst *rqstp, u32 *p, struct nfsd_readdirres *resp) { xdr_ressize_check(rqstp, p); p = resp->buffer; *p++ = 0; /* no more entries */ *p++ = htonl((resp->common.err == nfserr_eof)); rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1; return 1; } int nfssvc_encode_statfsres(struct svc_rqst *rqstp, u32 *p, struct nfsd_statfsres *resp) { struct kstatfs *stat = &resp->stats; *p++ = htonl(NFSSVC_MAXBLKSIZE); /* max transfer size */ *p++ = htonl(stat->f_bsize); *p++ = htonl(stat->f_blocks); *p++ = htonl(stat->f_bfree); *p++ = htonl(stat->f_bavail); return xdr_ressize_check(rqstp, p); } int nfssvc_encode_entry(struct readdir_cd *ccd, const char *name, int namlen, loff_t offset, ino_t ino, unsigned int d_type) { struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common); u32 *p = cd->buffer; int buflen, slen; /* dprintk("nfsd: entry(%.*s off %ld ino %ld)\n", namlen, name, offset, ino); */ if (offset > ~((u32) 0)) { cd->common.err = nfserr_fbig; return -EINVAL; } if (cd->offset) *cd->offset = htonl(offset); if (namlen > NFS2_MAXNAMLEN) namlen = NFS2_MAXNAMLEN;/* truncate filename */ slen = XDR_QUADLEN(namlen); if ((buflen = cd->buflen - slen - 4) < 0) { cd->common.err = nfserr_toosmall; return -EINVAL; } *p++ = xdr_one; /* mark entry present */ *p++ = htonl((u32) ino); /* file id */ p = xdr_encode_array(p, name, namlen);/* name length & name */ cd->offset = p; /* remember pointer */ *p++ = ~(u32) 0; /* offset of next entry */ cd->buflen = buflen; cd->buffer = p; cd->common.err = nfs_ok; return 0; } /* * XDR release functions */ int nfssvc_release_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *resp) { fh_put(&resp->fh); return 1; }