/* * linux/fs/nfsd/nfs3xdr.c * * XDR support for nfsd/protocol version 3. * * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> * * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()! */ #include <linux/types.h> #include <linux/time.h> #include <linux/nfs3.h> #include <linux/list.h> #include <linux/spinlock.h> #include <linux/dcache.h> #include <linux/namei.h> #include <linux/mm.h> #include <linux/vfs.h> #include <linux/sunrpc/xdr.h> #include <linux/sunrpc/svc.h> #include <linux/nfsd/nfsd.h> #include <linux/nfsd/xdr3.h> #define NFSDDBG_FACILITY NFSDDBG_XDR #ifdef NFSD_OPTIMIZE_SPACE # define inline #endif /* * Mapping of S_IF* types to NFS file types */ static u32 nfs3_ftypes[] = { NF3NON, NF3FIFO, NF3CHR, NF3BAD, NF3DIR, NF3BAD, NF3BLK, NF3BAD, NF3REG, NF3BAD, NF3LNK, NF3BAD, NF3SOCK, NF3BAD, NF3LNK, NF3BAD, }; /* * XDR functions for basic NFS types */ static inline u32 * encode_time3(u32 *p, struct timespec *time) { *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec); return p; } static inline u32 * decode_time3(u32 *p, struct timespec *time) { time->tv_sec = ntohl(*p++); time->tv_nsec = ntohl(*p++); return p; } static inline u32 * decode_fh(u32 *p, struct svc_fh *fhp) { unsigned int size; fh_init(fhp, NFS3_FHSIZE); size = ntohl(*p++); if (size > NFS3_FHSIZE) return NULL; memcpy(&fhp->fh_handle.fh_base, p, size); fhp->fh_handle.fh_size = size; return p + XDR_QUADLEN(size); } /* Helper function for NFSv3 ACL code */ u32 *nfs3svc_decode_fh(u32 *p, struct svc_fh *fhp) { return decode_fh(p, fhp); } static inline u32 * encode_fh(u32 *p, struct svc_fh *fhp) { unsigned int size = fhp->fh_handle.fh_size; *p++ = htonl(size); if (size) p[XDR_QUADLEN(size)-1]=0; memcpy(p, &fhp->fh_handle.fh_base, size); return p + XDR_QUADLEN(size); } /* * 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, NFS3_MAXNAMLEN)) != NULL) { for (i = 0, name = *namp; i < *lenp; i++, name++) { if (*name == '\0' || *name == '/') return NULL; } } return p; } static inline u32 * decode_sattr3(u32 *p, struct iattr *iap) { u32 tmp; iap->ia_valid = 0; if (*p++) { iap->ia_valid |= ATTR_MODE; iap->ia_mode = ntohl(*p++); } if (*p++) { iap->ia_valid |= ATTR_UID; iap->ia_uid = ntohl(*p++); } if (*p++) { iap->ia_valid |= ATTR_GID; iap->ia_gid = ntohl(*p++); } if (*p++) { u64 newsize; iap->ia_valid |= ATTR_SIZE; p = xdr_decode_hyper(p, &newsize); if (newsize <= NFS_OFFSET_MAX) iap->ia_size = newsize; else iap->ia_size = NFS_OFFSET_MAX; } if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ iap->ia_valid |= ATTR_ATIME; } else if (tmp == 2) { /* set to client time */ iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; iap->ia_atime.tv_sec = ntohl(*p++); iap->ia_atime.tv_nsec = ntohl(*p++); } if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ iap->ia_valid |= ATTR_MTIME; } else if (tmp == 2) { /* set to client time */ iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; iap->ia_mtime.tv_sec = ntohl(*p++); iap->ia_mtime.tv_nsec = ntohl(*p++); } return p; } static inline u32 * encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp, struct kstat *stat) { struct dentry *dentry = fhp->fh_dentry; struct timespec time; *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 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(stat->mode) && stat->size > NFS3_MAXPATHLEN) { p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); } else { p = xdr_encode_hyper(p, (u64) stat->size); } p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9); *p++ = htonl((u32) MAJOR(stat->rdev)); *p++ = htonl((u32) MINOR(stat->rdev)); if (is_fsid(fhp, rqstp->rq_reffh)) p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); else p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat->dev)); p = xdr_encode_hyper(p, (u64) stat->ino); p = encode_time3(p, &stat->atime); lease_get_mtime(dentry->d_inode, &time); p = encode_time3(p, &time); p = encode_time3(p, &stat->ctime); return p; } static inline u32 * encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) { struct inode *inode = fhp->fh_dentry->d_inode; /* Attributes to follow */ *p++ = xdr_one; *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]); *p++ = htonl((u32) fhp->fh_post_mode); *p++ = htonl((u32) fhp->fh_post_nlink); *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid)); *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid)); if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) { p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); } else { p = xdr_encode_hyper(p, (u64) fhp->fh_post_size); } p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9); *p++ = fhp->fh_post_rdev[0]; *p++ = fhp->fh_post_rdev[1]; if (is_fsid(fhp, rqstp->rq_reffh)) p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); else p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev)); p = xdr_encode_hyper(p, (u64) inode->i_ino); p = encode_time3(p, &fhp->fh_post_atime); p = encode_time3(p, &fhp->fh_post_mtime); p = encode_time3(p, &fhp->fh_post_ctime); return p; } /* * Encode post-operation attributes. * The inode may be NULL if the call failed because of a stale file * handle. In this case, no attributes are returned. */ static u32 * encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) { struct dentry *dentry = fhp->fh_dentry; if (dentry && dentry->d_inode != NULL) { int err; struct kstat stat; err = vfs_getattr(fhp->fh_export->ex_mnt, dentry, &stat); if (!err) { *p++ = xdr_one; /* attributes follow */ return encode_fattr3(rqstp, p, fhp, &stat); } } *p++ = xdr_zero; return p; } /* Helper for NFSv3 ACLs */ u32 * nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) { return encode_post_op_attr(rqstp, p, fhp); } /* * Enocde weak cache consistency data */ static u32 * encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) { struct dentry *dentry = fhp->fh_dentry; if (dentry && dentry->d_inode && fhp->fh_post_saved) { if (fhp->fh_pre_saved) { *p++ = xdr_one; p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size); p = encode_time3(p, &fhp->fh_pre_mtime); p = encode_time3(p, &fhp->fh_pre_ctime); } else { *p++ = xdr_zero; } return encode_saved_post_attr(rqstp, p, fhp); } /* no pre- or post-attrs */ *p++ = xdr_zero; return encode_post_op_attr(rqstp, p, fhp); } /* * XDR decode functions */ int nfs3svc_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 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_sattrargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_sattr3(p, &args->attrs))) return 0; if ((args->check_guard = ntohl(*p++)) != 0) { struct timespec time; p = decode_time3(p, &time); args->guardtime = time.tv_sec; } return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_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 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_accessargs *args) { if (!(p = decode_fh(p, &args->fh))) return 0; args->access = ntohl(*p++); return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readargs *args) { unsigned int len; int v,pn; if (!(p = decode_fh(p, &args->fh)) || !(p = xdr_decode_hyper(p, &args->offset))) return 0; len = args->count = ntohl(*p++); if (len > NFSSVC_MAXBLKSIZE) len = NFSSVC_MAXBLKSIZE; /* set up the kvec */ 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 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_writeargs *args) { unsigned int len, v, hdr; if (!(p = decode_fh(p, &args->fh)) || !(p = xdr_decode_hyper(p, &args->offset))) return 0; args->count = ntohl(*p++); args->stable = ntohl(*p++); len = args->len = ntohl(*p++); hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; if (rqstp->rq_arg.len < hdr || rqstp->rq_arg.len - hdr < len) return 0; args->vec[0].iov_base = (void*)p; args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; 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->count == args->len && args->vec[0].iov_len > 0; } int nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_createargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_filename(p, &args->name, &args->len))) return 0; switch (args->createmode = ntohl(*p++)) { case NFS3_CREATE_UNCHECKED: case NFS3_CREATE_GUARDED: if (!(p = decode_sattr3(p, &args->attrs))) return 0; break; case NFS3_CREATE_EXCLUSIVE: args->verf = p; p += 2; break; default: return 0; } return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_createargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_filename(p, &args->name, &args->len)) || !(p = decode_sattr3(p, &args->attrs))) return 0; return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_symlinkargs *args) { unsigned int len; int avail; char *old, *new; struct kvec *vec; if (!(p = decode_fh(p, &args->ffh)) || !(p = decode_filename(p, &args->fname, &args->flen)) || !(p = decode_sattr3(p, &args->attrs)) ) return 0; /* now decode the pathname, which might be larger than the first page. * As we have to check for nul's anyway, we copy it into a new page * This page appears in the rq_res.pages list, but as pages_len is always * 0, it won't get in the way */ svc_take_page(rqstp); len = ntohl(*p++); if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) return 0; args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); args->tlen = len; /* first copy and check from the first page */ old = (char*)p; vec = &rqstp->rq_arg.head[0]; avail = vec->iov_len - (old - (char*)vec->iov_base); while (len && avail && *old) { *new++ = *old++; len--; avail--; } /* now copy next page if there is one */ if (len && !avail && rqstp->rq_arg.page_len) { avail = rqstp->rq_arg.page_len; if (avail > PAGE_SIZE) avail = PAGE_SIZE; old = page_address(rqstp->rq_arg.pages[0]); } while (len && avail && *old) { *new++ = *old++; len--; avail--; } *new = '\0'; if (len) return 0; return 1; } int nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_mknodargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_filename(p, &args->name, &args->len))) return 0; args->ftype = ntohl(*p++); if (args->ftype == NF3BLK || args->ftype == NF3CHR || args->ftype == NF3SOCK || args->ftype == NF3FIFO) { if (!(p = decode_sattr3(p, &args->attrs))) return 0; } if (args->ftype == NF3BLK || args->ftype == NF3CHR) { args->major = ntohl(*p++); args->minor = ntohl(*p++); } return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_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 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_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 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_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 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readdirargs *args) { if (!(p = decode_fh(p, &args->fh))) return 0; p = xdr_decode_hyper(p, &args->cookie); args->verf = p; p += 2; args->dircount = ~0; 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); } int nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readdirargs *args) { int len, pn; if (!(p = decode_fh(p, &args->fh))) return 0; p = xdr_decode_hyper(p, &args->cookie); args->verf = p; p += 2; args->dircount = ntohl(*p++); args->count = ntohl(*p++); len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE : args->count; args->count = len; while (len > 0) { pn = rqstp->rq_resused; svc_take_page(rqstp); if (!args->buffer) args->buffer = page_address(rqstp->rq_respages[pn]); len -= PAGE_SIZE; } return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_commitargs *args) { if (!(p = decode_fh(p, &args->fh))) return 0; p = xdr_decode_hyper(p, &args->offset); args->count = ntohl(*p++); return xdr_argsize_check(rqstp, p); } /* * XDR encode functions */ /* * There must be an encoding function for void results so svc_process * will work properly. */ int nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy) { return xdr_ressize_check(rqstp, p); } /* GETATTR */ int nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p, struct nfsd3_attrstat *resp) { if (resp->status == 0) p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat); return xdr_ressize_check(rqstp, p); } /* SETATTR, REMOVE, RMDIR */ int nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p, struct nfsd3_attrstat *resp) { p = encode_wcc_data(rqstp, p, &resp->fh); return xdr_ressize_check(rqstp, p); } /* LOOKUP */ int nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_diropres *resp) { if (resp->status == 0) { p = encode_fh(p, &resp->fh); p = encode_post_op_attr(rqstp, p, &resp->fh); } p = encode_post_op_attr(rqstp, p, &resp->dirfh); return xdr_ressize_check(rqstp, p); } /* ACCESS */ int nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_accessres *resp) { p = encode_post_op_attr(rqstp, p, &resp->fh); if (resp->status == 0) *p++ = htonl(resp->access); return xdr_ressize_check(rqstp, p); } /* READLINK */ int nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readlinkres *resp) { p = encode_post_op_attr(rqstp, p, &resp->fh); if (resp->status == 0) { *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; } else return xdr_ressize_check(rqstp, p); } /* READ */ int nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readres *resp) { p = encode_post_op_attr(rqstp, p, &resp->fh); if (resp->status == 0) { *p++ = htonl(resp->count); *p++ = htonl(resp->eof); *p++ = htonl(resp->count); /* xdr opaque 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; } else return xdr_ressize_check(rqstp, p); } /* WRITE */ int nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_writeres *resp) { p = encode_wcc_data(rqstp, p, &resp->fh); if (resp->status == 0) { *p++ = htonl(resp->count); *p++ = htonl(resp->committed); *p++ = htonl(nfssvc_boot.tv_sec); *p++ = htonl(nfssvc_boot.tv_usec); } return xdr_ressize_check(rqstp, p); } /* CREATE, MKDIR, SYMLINK, MKNOD */ int nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_diropres *resp) { if (resp->status == 0) { *p++ = xdr_one; p = encode_fh(p, &resp->fh); p = encode_post_op_attr(rqstp, p, &resp->fh); } p = encode_wcc_data(rqstp, p, &resp->dirfh); return xdr_ressize_check(rqstp, p); } /* RENAME */ int nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_renameres *resp) { p = encode_wcc_data(rqstp, p, &resp->ffh); p = encode_wcc_data(rqstp, p, &resp->tfh); return xdr_ressize_check(rqstp, p); } /* LINK */ int nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_linkres *resp) { p = encode_post_op_attr(rqstp, p, &resp->fh); p = encode_wcc_data(rqstp, p, &resp->tfh); return xdr_ressize_check(rqstp, p); } /* READDIR */ int nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readdirres *resp) { p = encode_post_op_attr(rqstp, p, &resp->fh); if (resp->status == 0) { /* stupid readdir cookie */ memcpy(p, resp->verf, 8); p += 2; xdr_ressize_check(rqstp, p); if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) return 1; /*No room for trailer */ rqstp->rq_res.page_len = (resp->count) << 2; /* add the 'tail' to the end of the 'head' page - page 0. */ rqstp->rq_restailpage = 0; rqstp->rq_res.tail[0].iov_base = p; *p++ = 0; /* no more entries */ *p++ = htonl(resp->common.err == nfserr_eof); rqstp->rq_res.tail[0].iov_len = 2<<2; return 1; } else return xdr_ressize_check(rqstp, p); } static inline u32 * encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name, int namlen, ino_t ino) { *p++ = xdr_one; /* mark entry present */ p = xdr_encode_hyper(p, ino); /* file id */ p = xdr_encode_array(p, name, namlen);/* name length & name */ cd->offset = p; /* remember pointer */ p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ return p; } static inline u32 * encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p, struct svc_fh *fhp) { p = encode_post_op_attr(cd->rqstp, p, fhp); *p++ = xdr_one; /* yes, a file handle follows */ p = encode_fh(p, fhp); fh_put(fhp); return p; } static int compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, const char *name, int namlen) { struct svc_export *exp; struct dentry *dparent, *dchild; int rv = 0; dparent = cd->fh.fh_dentry; exp = cd->fh.fh_export; fh_init(fhp, NFS3_FHSIZE); if (isdotent(name, namlen)) { if (namlen == 2) { dchild = dget_parent(dparent); if (dchild == dparent) { /* filesystem root - cannot return filehandle for ".." */ dput(dchild); return 1; } } else dchild = dget(dparent); } else dchild = lookup_one_len(name, dparent, namlen); if (IS_ERR(dchild)) return 1; if (d_mountpoint(dchild) || fh_compose(fhp, exp, dchild, &cd->fh) != 0 || !dchild->d_inode) rv = 1; dput(dchild); return rv; } /* * Encode a directory entry. This one works for both normal readdir * and readdirplus. * The normal readdir reply requires 2 (fileid) + 1 (stringlen) * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. * * The readdirplus baggage is 1+21 words for post_op_attr, plus the * file handle. */ #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) static int encode_entry(struct readdir_cd *ccd, const char *name, int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus) { struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, common); u32 *p = cd->buffer; caddr_t curr_page_addr = NULL; int pn; /* current page number */ int slen; /* string (name) length */ int elen; /* estimated entry length in words */ int num_entry_words = 0; /* actual number of words */ if (cd->offset) { u64 offset64 = offset; if (unlikely(cd->offset1)) { /* we ended up with offset on a page boundary */ *cd->offset = htonl(offset64 >> 32); *cd->offset1 = htonl(offset64 & 0xffffffff); cd->offset1 = NULL; } else { xdr_encode_hyper(cd->offset, (u64) offset); } } /* dprintk("encode_entry(%.*s @%ld%s)\n", namlen, name, (long) offset, plus? " plus" : ""); */ /* truncate filename if too long */ if (namlen > NFS3_MAXNAMLEN) namlen = NFS3_MAXNAMLEN; slen = XDR_QUADLEN(namlen); elen = slen + NFS3_ENTRY_BAGGAGE + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); if (cd->buflen < elen) { cd->common.err = nfserr_toosmall; return -EINVAL; } /* determine which page in rq_respages[] we are currently filling */ for (pn=1; pn < cd->rqstp->rq_resused; pn++) { curr_page_addr = page_address(cd->rqstp->rq_respages[pn]); if (((caddr_t)cd->buffer >= curr_page_addr) && ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) break; } if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { /* encode entry in current page */ p = encode_entry_baggage(cd, p, name, namlen, ino); /* throw in readdirplus baggage */ if (plus) { struct svc_fh fh; if (compose_entry_fh(cd, &fh, name, namlen) > 0) { *p++ = 0; *p++ = 0; } else p = encode_entryplus_baggage(cd, p, &fh); } num_entry_words = p - cd->buffer; } else if (cd->rqstp->rq_respages[pn+1] != NULL) { /* temporarily encode entry into next page, then move back to * current and next page in rq_respages[] */ u32 *p1, *tmp; int len1, len2; /* grab next page for temporary storage of entry */ p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]); p1 = encode_entry_baggage(cd, p1, name, namlen, ino); /* throw in readdirplus baggage */ if (plus) { struct svc_fh fh; if (compose_entry_fh(cd, &fh, name, namlen) > 0) { /* zero out the filehandle */ *p1++ = 0; *p1++ = 0; } else p1 = encode_entryplus_baggage(cd, p1, &fh); } /* determine entry word length and lengths to go in pages */ num_entry_words = p1 - tmp; len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; if ((num_entry_words << 2) < len1) { /* the actual number of words in the entry is less * than elen and can still fit in the current page */ memmove(p, tmp, num_entry_words << 2); p += num_entry_words; /* update offset */ cd->offset = cd->buffer + (cd->offset - tmp); } else { unsigned int offset_r = (cd->offset - tmp) << 2; /* update pointer to offset location. * This is a 64bit quantity, so we need to * deal with 3 cases: * - entirely in first page * - entirely in second page * - 4 bytes in each page */ if (offset_r + 8 <= len1) { cd->offset = p + (cd->offset - tmp); } else if (offset_r >= len1) { cd->offset -= len1 >> 2; } else { /* sitting on the fence */ BUG_ON(offset_r != len1 - 4); cd->offset = p + (cd->offset - tmp); cd->offset1 = tmp; } len2 = (num_entry_words << 2) - len1; /* move from temp page to current and next pages */ memmove(p, tmp, len1); memmove(tmp, (caddr_t)tmp+len1, len2); p = tmp + (len2 >> 2); } } else { cd->common.err = nfserr_toosmall; return -EINVAL; } cd->buflen -= num_entry_words; cd->buffer = p; cd->common.err = nfs_ok; return 0; } int nfs3svc_encode_entry(struct readdir_cd *cd, const char *name, int namlen, loff_t offset, ino_t ino, unsigned int d_type) { return encode_entry(cd, name, namlen, offset, ino, d_type, 0); } int nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name, int namlen, loff_t offset, ino_t ino, unsigned int d_type) { return encode_entry(cd, name, namlen, offset, ino, d_type, 1); } /* FSSTAT */ int nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_fsstatres *resp) { struct kstatfs *s = &resp->stats; u64 bs = s->f_bsize; *p++ = xdr_zero; /* no post_op_attr */ if (resp->status == 0) { p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ p = xdr_encode_hyper(p, s->f_files); /* total inodes */ p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ *p++ = htonl(resp->invarsec); /* mean unchanged time */ } return xdr_ressize_check(rqstp, p); } /* FSINFO */ int nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p, struct nfsd3_fsinfores *resp) { *p++ = xdr_zero; /* no post_op_attr */ if (resp->status == 0) { *p++ = htonl(resp->f_rtmax); *p++ = htonl(resp->f_rtpref); *p++ = htonl(resp->f_rtmult); *p++ = htonl(resp->f_wtmax); *p++ = htonl(resp->f_wtpref); *p++ = htonl(resp->f_wtmult); *p++ = htonl(resp->f_dtpref); p = xdr_encode_hyper(p, resp->f_maxfilesize); *p++ = xdr_one; *p++ = xdr_zero; *p++ = htonl(resp->f_properties); } return xdr_ressize_check(rqstp, p); } /* PATHCONF */ int nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_pathconfres *resp) { *p++ = xdr_zero; /* no post_op_attr */ if (resp->status == 0) { *p++ = htonl(resp->p_link_max); *p++ = htonl(resp->p_name_max); *p++ = htonl(resp->p_no_trunc); *p++ = htonl(resp->p_chown_restricted); *p++ = htonl(resp->p_case_insensitive); *p++ = htonl(resp->p_case_preserving); } return xdr_ressize_check(rqstp, p); } /* COMMIT */ int nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_commitres *resp) { p = encode_wcc_data(rqstp, p, &resp->fh); /* Write verifier */ if (resp->status == 0) { *p++ = htonl(nfssvc_boot.tv_sec); *p++ = htonl(nfssvc_boot.tv_usec); } return xdr_ressize_check(rqstp, p); } /* * XDR release functions */ int nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd3_attrstat *resp) { fh_put(&resp->fh); return 1; } int nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p, struct nfsd3_fhandle_pair *resp) { fh_put(&resp->fh1); fh_put(&resp->fh2); return 1; }