/* * fs/nfs/nfs4xdr.c * * Server-side XDR for NFSv4 * * Copyright (c) 2002 The Regents of the University of Michigan. * All rights reserved. * * Kendrick Smith <kmsmith@umich.edu> * Andy Adamson <andros@umich.edu> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * TODO: Neil Brown made the following observation: We currently * initially reserve NFSD_BUFSIZE space on the transmit queue and * never release any of that until the request is complete. * It would be good to calculate a new maximum response size while * decoding the COMPOUND, and call svc_reserve with this number * at the end of nfs4svc_decode_compoundargs. */ #include <linux/param.h> #include <linux/smp.h> #include <linux/fs.h> #include <linux/namei.h> #include <linux/vfs.h> #include <linux/sunrpc/xdr.h> #include <linux/sunrpc/svc.h> #include <linux/sunrpc/clnt.h> #include <linux/nfsd/nfsd.h> #include <linux/nfsd/state.h> #include <linux/nfsd/xdr4.h> #include <linux/nfsd_idmap.h> #include <linux/nfs4.h> #include <linux/nfs4_acl.h> #include <linux/sunrpc/gss_api.h> #include <linux/sunrpc/svcauth_gss.h> #define NFSDDBG_FACILITY NFSDDBG_XDR /* * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing * directory in order to indicate to the client that a filesystem boundary is present * We use a fixed fsid for a referral */ #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL static __be32 check_filename(char *str, int len, __be32 err) { int i; if (len == 0) return nfserr_inval; if (isdotent(str, len)) return err; for (i = 0; i < len; i++) if (str[i] == '/') return err; return 0; } /* * START OF "GENERIC" DECODE ROUTINES. * These may look a little ugly since they are imported from a "generic" * set of XDR encode/decode routines which are intended to be shared by * all of our NFSv4 implementations (OpenBSD, MacOS X...). * * If the pain of reading these is too great, it should be a straightforward * task to translate them into Linux-specific versions which are more * consistent with the style used in NFSv2/v3... */ #define DECODE_HEAD \ __be32 *p; \ __be32 status #define DECODE_TAIL \ status = 0; \ out: \ return status; \ xdr_error: \ dprintk("NFSD: xdr error (%s:%d)\n", \ __FILE__, __LINE__); \ status = nfserr_bad_xdr; \ goto out #define READ32(x) (x) = ntohl(*p++) #define READ64(x) do { \ (x) = (u64)ntohl(*p++) << 32; \ (x) |= ntohl(*p++); \ } while (0) #define READTIME(x) do { \ p++; \ (x) = ntohl(*p++); \ p++; \ } while (0) #define READMEM(x,nbytes) do { \ x = (char *)p; \ p += XDR_QUADLEN(nbytes); \ } while (0) #define SAVEMEM(x,nbytes) do { \ if (!(x = (p==argp->tmp || p == argp->tmpp) ? \ savemem(argp, p, nbytes) : \ (char *)p)) { \ dprintk("NFSD: xdr error (%s:%d)\n", \ __FILE__, __LINE__); \ goto xdr_error; \ } \ p += XDR_QUADLEN(nbytes); \ } while (0) #define COPYMEM(x,nbytes) do { \ memcpy((x), p, nbytes); \ p += XDR_QUADLEN(nbytes); \ } while (0) /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */ #define READ_BUF(nbytes) do { \ if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \ p = argp->p; \ argp->p += XDR_QUADLEN(nbytes); \ } else if (!(p = read_buf(argp, nbytes))) { \ dprintk("NFSD: xdr error (%s:%d)\n", \ __FILE__, __LINE__); \ goto xdr_error; \ } \ } while (0) static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes) { /* We want more bytes than seem to be available. * Maybe we need a new page, maybe we have just run out */ unsigned int avail = (char *)argp->end - (char *)argp->p; __be32 *p; if (avail + argp->pagelen < nbytes) return NULL; if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */ return NULL; /* ok, we can do it with the current plus the next page */ if (nbytes <= sizeof(argp->tmp)) p = argp->tmp; else { kfree(argp->tmpp); p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL); if (!p) return NULL; } /* * The following memcpy is safe because read_buf is always * called with nbytes > avail, and the two cases above both * guarantee p points to at least nbytes bytes. */ memcpy(p, argp->p, avail); /* step to next page */ argp->p = page_address(argp->pagelist[0]); argp->pagelist++; if (argp->pagelen < PAGE_SIZE) { argp->end = p + (argp->pagelen>>2); argp->pagelen = 0; } else { argp->end = p + (PAGE_SIZE>>2); argp->pagelen -= PAGE_SIZE; } memcpy(((char*)p)+avail, argp->p, (nbytes - avail)); argp->p += XDR_QUADLEN(nbytes - avail); return p; } static int defer_free(struct nfsd4_compoundargs *argp, void (*release)(const void *), void *p) { struct tmpbuf *tb; tb = kmalloc(sizeof(*tb), GFP_KERNEL); if (!tb) return -ENOMEM; tb->buf = p; tb->release = release; tb->next = argp->to_free; argp->to_free = tb; return 0; } static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes) { if (p == argp->tmp) { p = kmalloc(nbytes, GFP_KERNEL); if (!p) return NULL; memcpy(p, argp->tmp, nbytes); } else { BUG_ON(p != argp->tmpp); argp->tmpp = NULL; } if (defer_free(argp, kfree, p)) { kfree(p); return NULL; } else return (char *)p; } static __be32 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval) { u32 bmlen; DECODE_HEAD; bmval[0] = 0; bmval[1] = 0; READ_BUF(4); READ32(bmlen); if (bmlen > 1000) goto xdr_error; READ_BUF(bmlen << 2); if (bmlen > 0) READ32(bmval[0]); if (bmlen > 1) READ32(bmval[1]); DECODE_TAIL; } static __be32 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr, struct nfs4_acl **acl) { int expected_len, len = 0; u32 dummy32; char *buf; int host_err; DECODE_HEAD; iattr->ia_valid = 0; if ((status = nfsd4_decode_bitmap(argp, bmval))) return status; /* * According to spec, unsupported attributes return ERR_ATTRNOTSUPP; * read-only attributes return ERR_INVAL. */ if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1)) return nfserr_attrnotsupp; if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1)) return nfserr_inval; READ_BUF(4); READ32(expected_len); if (bmval[0] & FATTR4_WORD0_SIZE) { READ_BUF(8); len += 8; READ64(iattr->ia_size); iattr->ia_valid |= ATTR_SIZE; } if (bmval[0] & FATTR4_WORD0_ACL) { int nace; struct nfs4_ace *ace; READ_BUF(4); len += 4; READ32(nace); if (nace > NFS4_ACL_MAX) return nfserr_resource; *acl = nfs4_acl_new(nace); if (*acl == NULL) { host_err = -ENOMEM; goto out_nfserr; } defer_free(argp, kfree, *acl); (*acl)->naces = nace; for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) { READ_BUF(16); len += 16; READ32(ace->type); READ32(ace->flag); READ32(ace->access_mask); READ32(dummy32); READ_BUF(dummy32); len += XDR_QUADLEN(dummy32) << 2; READMEM(buf, dummy32); ace->whotype = nfs4_acl_get_whotype(buf, dummy32); host_err = 0; if (ace->whotype != NFS4_ACL_WHO_NAMED) ace->who = 0; else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &ace->who); else host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &ace->who); if (host_err) goto out_nfserr; } } else *acl = NULL; if (bmval[1] & FATTR4_WORD1_MODE) { READ_BUF(4); len += 4; READ32(iattr->ia_mode); iattr->ia_mode &= (S_IFMT | S_IALLUGO); iattr->ia_valid |= ATTR_MODE; } if (bmval[1] & FATTR4_WORD1_OWNER) { READ_BUF(4); len += 4; READ32(dummy32); READ_BUF(dummy32); len += (XDR_QUADLEN(dummy32) << 2); READMEM(buf, dummy32); if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid))) goto out_nfserr; iattr->ia_valid |= ATTR_UID; } if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { READ_BUF(4); len += 4; READ32(dummy32); READ_BUF(dummy32); len += (XDR_QUADLEN(dummy32) << 2); READMEM(buf, dummy32); if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid))) goto out_nfserr; iattr->ia_valid |= ATTR_GID; } if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { READ_BUF(4); len += 4; READ32(dummy32); switch (dummy32) { case NFS4_SET_TO_CLIENT_TIME: /* We require the high 32 bits of 'seconds' to be 0, and we ignore all 32 bits of 'nseconds'. */ READ_BUF(12); len += 12; READ32(dummy32); if (dummy32) return nfserr_inval; READ32(iattr->ia_atime.tv_sec); READ32(iattr->ia_atime.tv_nsec); if (iattr->ia_atime.tv_nsec >= (u32)1000000000) return nfserr_inval; iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); break; case NFS4_SET_TO_SERVER_TIME: iattr->ia_valid |= ATTR_ATIME; break; default: goto xdr_error; } } if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { READ_BUF(4); len += 4; READ32(dummy32); switch (dummy32) { case NFS4_SET_TO_CLIENT_TIME: /* We require the high 32 bits of 'seconds' to be 0, and we ignore all 32 bits of 'nseconds'. */ READ_BUF(12); len += 12; READ32(dummy32); if (dummy32) return nfserr_inval; READ32(iattr->ia_mtime.tv_sec); READ32(iattr->ia_mtime.tv_nsec); if (iattr->ia_mtime.tv_nsec >= (u32)1000000000) return nfserr_inval; iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); break; case NFS4_SET_TO_SERVER_TIME: iattr->ia_valid |= ATTR_MTIME; break; default: goto xdr_error; } } if (len != expected_len) goto xdr_error; DECODE_TAIL; out_nfserr: status = nfserrno(host_err); goto out; } static __be32 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access) { DECODE_HEAD; READ_BUF(4); READ32(access->ac_req_access); DECODE_TAIL; } static __be32 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close) { DECODE_HEAD; close->cl_stateowner = NULL; READ_BUF(4 + sizeof(stateid_t)); READ32(close->cl_seqid); READ32(close->cl_stateid.si_generation); COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t)); DECODE_TAIL; } static __be32 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit) { DECODE_HEAD; READ_BUF(12); READ64(commit->co_offset); READ32(commit->co_count); DECODE_TAIL; } static __be32 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) { DECODE_HEAD; READ_BUF(4); READ32(create->cr_type); switch (create->cr_type) { case NF4LNK: READ_BUF(4); READ32(create->cr_linklen); READ_BUF(create->cr_linklen); SAVEMEM(create->cr_linkname, create->cr_linklen); break; case NF4BLK: case NF4CHR: READ_BUF(8); READ32(create->cr_specdata1); READ32(create->cr_specdata2); break; case NF4SOCK: case NF4FIFO: case NF4DIR: default: break; } READ_BUF(4); READ32(create->cr_namelen); READ_BUF(create->cr_namelen); SAVEMEM(create->cr_name, create->cr_namelen); if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval))) return status; if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl))) goto out; DECODE_TAIL; } static inline __be32 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr) { DECODE_HEAD; READ_BUF(sizeof(stateid_t)); READ32(dr->dr_stateid.si_generation); COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t)); DECODE_TAIL; } static inline __be32 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr) { return nfsd4_decode_bitmap(argp, getattr->ga_bmval); } static __be32 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link) { DECODE_HEAD; READ_BUF(4); READ32(link->li_namelen); READ_BUF(link->li_namelen); SAVEMEM(link->li_name, link->li_namelen); if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval))) return status; DECODE_TAIL; } static __be32 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) { DECODE_HEAD; lock->lk_replay_owner = NULL; /* * type, reclaim(boolean), offset, length, new_lock_owner(boolean) */ READ_BUF(28); READ32(lock->lk_type); if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) goto xdr_error; READ32(lock->lk_reclaim); READ64(lock->lk_offset); READ64(lock->lk_length); READ32(lock->lk_is_new); if (lock->lk_is_new) { READ_BUF(36); READ32(lock->lk_new_open_seqid); READ32(lock->lk_new_open_stateid.si_generation); COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t)); READ32(lock->lk_new_lock_seqid); COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t)); READ32(lock->lk_new_owner.len); READ_BUF(lock->lk_new_owner.len); READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len); } else { READ_BUF(20); READ32(lock->lk_old_lock_stateid.si_generation); COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t)); READ32(lock->lk_old_lock_seqid); } DECODE_TAIL; } static __be32 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt) { DECODE_HEAD; READ_BUF(32); READ32(lockt->lt_type); if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) goto xdr_error; READ64(lockt->lt_offset); READ64(lockt->lt_length); COPYMEM(&lockt->lt_clientid, 8); READ32(lockt->lt_owner.len); READ_BUF(lockt->lt_owner.len); READMEM(lockt->lt_owner.data, lockt->lt_owner.len); DECODE_TAIL; } static __be32 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku) { DECODE_HEAD; locku->lu_stateowner = NULL; READ_BUF(24 + sizeof(stateid_t)); READ32(locku->lu_type); if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) goto xdr_error; READ32(locku->lu_seqid); READ32(locku->lu_stateid.si_generation); COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t)); READ64(locku->lu_offset); READ64(locku->lu_length); DECODE_TAIL; } static __be32 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup) { DECODE_HEAD; READ_BUF(4); READ32(lookup->lo_len); READ_BUF(lookup->lo_len); SAVEMEM(lookup->lo_name, lookup->lo_len); if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent))) return status; DECODE_TAIL; } static __be32 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) { DECODE_HEAD; memset(open->op_bmval, 0, sizeof(open->op_bmval)); open->op_iattr.ia_valid = 0; open->op_stateowner = NULL; /* seqid, share_access, share_deny, clientid, ownerlen */ READ_BUF(16 + sizeof(clientid_t)); READ32(open->op_seqid); READ32(open->op_share_access); READ32(open->op_share_deny); COPYMEM(&open->op_clientid, sizeof(clientid_t)); READ32(open->op_owner.len); /* owner, open_flag */ READ_BUF(open->op_owner.len + 4); SAVEMEM(open->op_owner.data, open->op_owner.len); READ32(open->op_create); switch (open->op_create) { case NFS4_OPEN_NOCREATE: break; case NFS4_OPEN_CREATE: READ_BUF(4); READ32(open->op_createmode); switch (open->op_createmode) { case NFS4_CREATE_UNCHECKED: case NFS4_CREATE_GUARDED: if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl))) goto out; break; case NFS4_CREATE_EXCLUSIVE: READ_BUF(8); COPYMEM(open->op_verf.data, 8); break; default: goto xdr_error; } break; default: goto xdr_error; } /* open_claim */ READ_BUF(4); READ32(open->op_claim_type); switch (open->op_claim_type) { case NFS4_OPEN_CLAIM_NULL: case NFS4_OPEN_CLAIM_DELEGATE_PREV: READ_BUF(4); READ32(open->op_fname.len); READ_BUF(open->op_fname.len); SAVEMEM(open->op_fname.data, open->op_fname.len); if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval))) return status; break; case NFS4_OPEN_CLAIM_PREVIOUS: READ_BUF(4); READ32(open->op_delegate_type); break; case NFS4_OPEN_CLAIM_DELEGATE_CUR: READ_BUF(sizeof(stateid_t) + 4); COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t)); READ32(open->op_fname.len); READ_BUF(open->op_fname.len); SAVEMEM(open->op_fname.data, open->op_fname.len); if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval))) return status; break; default: goto xdr_error; } DECODE_TAIL; } static __be32 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf) { DECODE_HEAD; open_conf->oc_stateowner = NULL; READ_BUF(4 + sizeof(stateid_t)); READ32(open_conf->oc_req_stateid.si_generation); COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t)); READ32(open_conf->oc_seqid); DECODE_TAIL; } static __be32 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down) { DECODE_HEAD; open_down->od_stateowner = NULL; READ_BUF(12 + sizeof(stateid_t)); READ32(open_down->od_stateid.si_generation); COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t)); READ32(open_down->od_seqid); READ32(open_down->od_share_access); READ32(open_down->od_share_deny); DECODE_TAIL; } static __be32 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh) { DECODE_HEAD; READ_BUF(4); READ32(putfh->pf_fhlen); if (putfh->pf_fhlen > NFS4_FHSIZE) goto xdr_error; READ_BUF(putfh->pf_fhlen); SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen); DECODE_TAIL; } static __be32 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read) { DECODE_HEAD; READ_BUF(sizeof(stateid_t) + 12); READ32(read->rd_stateid.si_generation); COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t)); READ64(read->rd_offset); READ32(read->rd_length); DECODE_TAIL; } static __be32 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir) { DECODE_HEAD; READ_BUF(24); READ64(readdir->rd_cookie); COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data)); READ32(readdir->rd_dircount); /* just in case you needed a useless field... */ READ32(readdir->rd_maxcount); if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval))) goto out; DECODE_TAIL; } static __be32 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove) { DECODE_HEAD; READ_BUF(4); READ32(remove->rm_namelen); READ_BUF(remove->rm_namelen); SAVEMEM(remove->rm_name, remove->rm_namelen); if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent))) return status; DECODE_TAIL; } static __be32 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename) { DECODE_HEAD; READ_BUF(4); READ32(rename->rn_snamelen); READ_BUF(rename->rn_snamelen + 4); SAVEMEM(rename->rn_sname, rename->rn_snamelen); READ32(rename->rn_tnamelen); READ_BUF(rename->rn_tnamelen); SAVEMEM(rename->rn_tname, rename->rn_tnamelen); if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent))) return status; if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval))) return status; DECODE_TAIL; } static __be32 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid) { DECODE_HEAD; READ_BUF(sizeof(clientid_t)); COPYMEM(clientid, sizeof(clientid_t)); DECODE_TAIL; } static __be32 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp, struct nfsd4_secinfo *secinfo) { DECODE_HEAD; READ_BUF(4); READ32(secinfo->si_namelen); READ_BUF(secinfo->si_namelen); SAVEMEM(secinfo->si_name, secinfo->si_namelen); status = check_filename(secinfo->si_name, secinfo->si_namelen, nfserr_noent); if (status) return status; DECODE_TAIL; } static __be32 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr) { DECODE_HEAD; READ_BUF(sizeof(stateid_t)); READ32(setattr->sa_stateid.si_generation); COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t)); if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl))) goto out; DECODE_TAIL; } static __be32 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid) { DECODE_HEAD; READ_BUF(12); COPYMEM(setclientid->se_verf.data, 8); READ32(setclientid->se_namelen); READ_BUF(setclientid->se_namelen + 8); SAVEMEM(setclientid->se_name, setclientid->se_namelen); READ32(setclientid->se_callback_prog); READ32(setclientid->se_callback_netid_len); READ_BUF(setclientid->se_callback_netid_len + 4); SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len); READ32(setclientid->se_callback_addr_len); READ_BUF(setclientid->se_callback_addr_len + 4); SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len); READ32(setclientid->se_callback_ident); DECODE_TAIL; } static __be32 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c) { DECODE_HEAD; READ_BUF(8 + sizeof(nfs4_verifier)); COPYMEM(&scd_c->sc_clientid, 8); COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier)); DECODE_TAIL; } /* Also used for NVERIFY */ static __be32 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify) { #if 0 struct nfsd4_compoundargs save = { .p = argp->p, .end = argp->end, .rqstp = argp->rqstp, }; u32 ve_bmval[2]; struct iattr ve_iattr; /* request */ struct nfs4_acl *ve_acl; /* request */ #endif DECODE_HEAD; if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval))) goto out; /* For convenience's sake, we compare raw xdr'd attributes in * nfsd4_proc_verify; however we still decode here just to return * correct error in case of bad xdr. */ #if 0 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl); if (status == nfserr_inval) { status = nfserrno(status); goto out; } #endif READ_BUF(4); READ32(verify->ve_attrlen); READ_BUF(verify->ve_attrlen); SAVEMEM(verify->ve_attrval, verify->ve_attrlen); DECODE_TAIL; } static __be32 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) { int avail; int v; int len; DECODE_HEAD; READ_BUF(sizeof(stateid_opaque_t) + 20); READ32(write->wr_stateid.si_generation); COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t)); READ64(write->wr_offset); READ32(write->wr_stable_how); if (write->wr_stable_how > 2) goto xdr_error; READ32(write->wr_buflen); /* Sorry .. no magic macros for this.. * * READ_BUF(write->wr_buflen); * SAVEMEM(write->wr_buf, write->wr_buflen); */ avail = (char*)argp->end - (char*)argp->p; if (avail + argp->pagelen < write->wr_buflen) { dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__); goto xdr_error; } argp->rqstp->rq_vec[0].iov_base = p; argp->rqstp->rq_vec[0].iov_len = avail; v = 0; len = write->wr_buflen; while (len > argp->rqstp->rq_vec[v].iov_len) { len -= argp->rqstp->rq_vec[v].iov_len; v++; argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]); argp->pagelist++; if (argp->pagelen >= PAGE_SIZE) { argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE; argp->pagelen -= PAGE_SIZE; } else { argp->rqstp->rq_vec[v].iov_len = argp->pagelen; argp->pagelen -= len; } } argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len); argp->p = (__be32*) (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2)); argp->rqstp->rq_vec[v].iov_len = len; write->wr_vlen = v+1; DECODE_TAIL; } static __be32 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner) { DECODE_HEAD; READ_BUF(12); COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t)); READ32(rlockowner->rl_owner.len); READ_BUF(rlockowner->rl_owner.len); READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len); DECODE_TAIL; } static __be32 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p) { return nfs_ok; } static __be32 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p) { return nfserr_opnotsupp; } typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *); static nfsd4_dec nfsd4_dec_ops[] = { [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access, [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close, [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit, [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create, [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp, [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn, [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr, [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop, [OP_LINK] = (nfsd4_dec)nfsd4_decode_link, [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock, [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt, [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku, [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup, [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop, [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify, [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open, [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp, [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm, [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade, [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh, [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_notsupp, [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop, [OP_READ] = (nfsd4_dec)nfsd4_decode_read, [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir, [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop, [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove, [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename, [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew, [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop, [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop, [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo, [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr, [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid, [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm, [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify, [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write, [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner, }; struct nfsd4_minorversion_ops { nfsd4_dec *decoders; int nops; }; static struct nfsd4_minorversion_ops nfsd4_minorversion[] = { [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) }, }; static __be32 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) { DECODE_HEAD; struct nfsd4_op *op; struct nfsd4_minorversion_ops *ops; int i; /* * XXX: According to spec, we should check the tag * for UTF-8 compliance. I'm postponing this for * now because it seems that some clients do use * binary tags. */ READ_BUF(4); READ32(argp->taglen); READ_BUF(argp->taglen + 8); SAVEMEM(argp->tag, argp->taglen); READ32(argp->minorversion); READ32(argp->opcnt); if (argp->taglen > NFSD4_MAX_TAGLEN) goto xdr_error; if (argp->opcnt > 100) goto xdr_error; if (argp->opcnt > ARRAY_SIZE(argp->iops)) { argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); if (!argp->ops) { argp->ops = argp->iops; dprintk("nfsd: couldn't allocate room for COMPOUND\n"); goto xdr_error; } } if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion)) argp->opcnt = 0; ops = &nfsd4_minorversion[argp->minorversion]; for (i = 0; i < argp->opcnt; i++) { op = &argp->ops[i]; op->replay = NULL; /* * We can't use READ_BUF() here because we need to handle * a missing opcode as an OP_WRITE + 1. So we need to check * to see if we're truly at the end of our buffer or if there * is another page we need to flip to. */ if (argp->p == argp->end) { if (argp->pagelen < 4) { /* There isn't an opcode still on the wire */ op->opnum = OP_WRITE + 1; op->status = nfserr_bad_xdr; argp->opcnt = i+1; break; } /* * False alarm. We just hit a page boundary, but there * is still data available. Move pointer across page * boundary. *snip from READ_BUF* */ argp->p = page_address(argp->pagelist[0]); argp->pagelist++; if (argp->pagelen < PAGE_SIZE) { argp->end = p + (argp->pagelen>>2); argp->pagelen = 0; } else { argp->end = p + (PAGE_SIZE>>2); argp->pagelen -= PAGE_SIZE; } } op->opnum = ntohl(*argp->p++); if (op->opnum >= OP_ACCESS && op->opnum < ops->nops) op->status = ops->decoders[op->opnum](argp, &op->u); else { op->opnum = OP_ILLEGAL; op->status = nfserr_op_illegal; } if (op->status) { argp->opcnt = i+1; break; } } DECODE_TAIL; } /* * END OF "GENERIC" DECODE ROUTINES. */ /* * START OF "GENERIC" ENCODE ROUTINES. * These may look a little ugly since they are imported from a "generic" * set of XDR encode/decode routines which are intended to be shared by * all of our NFSv4 implementations (OpenBSD, MacOS X...). * * If the pain of reading these is too great, it should be a straightforward * task to translate them into Linux-specific versions which are more * consistent with the style used in NFSv2/v3... */ #define ENCODE_HEAD __be32 *p #define WRITE32(n) *p++ = htonl(n) #define WRITE64(n) do { \ *p++ = htonl((u32)((n) >> 32)); \ *p++ = htonl((u32)(n)); \ } while (0) #define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \ *(p + XDR_QUADLEN(nbytes) -1) = 0; \ memcpy(p, ptr, nbytes); \ p += XDR_QUADLEN(nbytes); \ }} while (0) #define WRITECINFO(c) do { \ *p++ = htonl(c.atomic); \ *p++ = htonl(c.before_ctime_sec); \ *p++ = htonl(c.before_ctime_nsec); \ *p++ = htonl(c.after_ctime_sec); \ *p++ = htonl(c.after_ctime_nsec); \ } while (0) #define RESERVE_SPACE(nbytes) do { \ p = resp->p; \ BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \ } while (0) #define ADJUST_ARGS() resp->p = p /* * Header routine to setup seqid operation replay cache */ #define ENCODE_SEQID_OP_HEAD \ __be32 *p; \ __be32 *save; \ \ save = resp->p; /* * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This * is where sequence id's are incremented, and the replay cache is filled. * Note that we increment sequence id's here, at the last moment, so we're sure * we know whether the error to be returned is a sequence id mutating error. */ #define ENCODE_SEQID_OP_TAIL(stateowner) do { \ if (seqid_mutating_err(nfserr) && stateowner) { \ stateowner->so_seqid++; \ stateowner->so_replay.rp_status = nfserr; \ stateowner->so_replay.rp_buflen = \ (((char *)(resp)->p - (char *)save)); \ memcpy(stateowner->so_replay.rp_buf, save, \ stateowner->so_replay.rp_buflen); \ } } while (0); /* Encode as an array of strings the string given with components * seperated @sep. */ static __be32 nfsd4_encode_components(char sep, char *components, __be32 **pp, int *buflen) { __be32 *p = *pp; __be32 *countp = p; int strlen, count=0; char *str, *end; dprintk("nfsd4_encode_components(%s)\n", components); if ((*buflen -= 4) < 0) return nfserr_resource; WRITE32(0); /* We will fill this in with @count later */ end = str = components; while (*end) { for (; *end && (*end != sep); end++) ; /* Point to end of component */ strlen = end - str; if (strlen) { if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0) return nfserr_resource; WRITE32(strlen); WRITEMEM(str, strlen); count++; } else end++; str = end; } *pp = p; p = countp; WRITE32(count); return 0; } /* * encode a location element of a fs_locations structure */ static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location, __be32 **pp, int *buflen) { __be32 status; __be32 *p = *pp; status = nfsd4_encode_components(':', location->hosts, &p, buflen); if (status) return status; status = nfsd4_encode_components('/', location->path, &p, buflen); if (status) return status; *pp = p; return 0; } /* * Return the path to an export point in the pseudo filesystem namespace * Returned string is safe to use as long as the caller holds a reference * to @exp. */ static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat) { struct svc_fh tmp_fh; char *path, *rootpath; fh_init(&tmp_fh, NFS4_FHSIZE); *stat = exp_pseudoroot(rqstp, &tmp_fh); if (*stat) return NULL; rootpath = tmp_fh.fh_export->ex_pathname; path = exp->ex_pathname; if (strncmp(path, rootpath, strlen(rootpath))) { dprintk("nfsd: fs_locations failed;" "%s is not contained in %s\n", path, rootpath); *stat = nfserr_notsupp; return NULL; } return path + strlen(rootpath); } /* * encode a fs_locations structure */ static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp, struct svc_export *exp, __be32 **pp, int *buflen) { __be32 status; int i; __be32 *p = *pp; struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; char *root = nfsd4_path(rqstp, exp, &status); if (status) return status; status = nfsd4_encode_components('/', root, &p, buflen); if (status) return status; if ((*buflen -= 4) < 0) return nfserr_resource; WRITE32(fslocs->locations_count); for (i=0; i<fslocs->locations_count; i++) { status = nfsd4_encode_fs_location4(&fslocs->locations[i], &p, buflen); if (status) return status; } *pp = p; return 0; } static u32 nfs4_ftypes[16] = { NF4BAD, NF4FIFO, NF4CHR, NF4BAD, NF4DIR, NF4BAD, NF4BLK, NF4BAD, NF4REG, NF4BAD, NF4LNK, NF4BAD, NF4SOCK, NF4BAD, NF4LNK, NF4BAD, }; static __be32 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group, __be32 **p, int *buflen) { int status; if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4) return nfserr_resource; if (whotype != NFS4_ACL_WHO_NAMED) status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1)); else if (group) status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1)); else status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1)); if (status < 0) return nfserrno(status); *p = xdr_encode_opaque(*p, NULL, status); *buflen -= (XDR_QUADLEN(status) << 2) + 4; BUG_ON(*buflen < 0); return 0; } static inline __be32 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen) { return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen); } static inline __be32 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen) { return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen); } static inline __be32 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group, __be32 **p, int *buflen) { return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen); } #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ FATTR4_WORD0_RDATTR_ERROR) #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err) { /* As per referral draft: */ if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || *bmval0 & FATTR4_WORD0_FS_LOCATIONS) *rdattr_err = NFSERR_MOVED; else return nfserr_moved; } *bmval0 &= WORD0_ABSENT_FS_ATTRS; *bmval1 &= WORD1_ABSENT_FS_ATTRS; return 0; } /* * Note: @fhp can be NULL; in this case, we might have to compose the filehandle * ourselves. * * @countp is the buffer size in _words_; upon successful return this becomes * replaced with the number of words written. */ __be32 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval, struct svc_rqst *rqstp, int ignore_crossmnt) { u32 bmval0 = bmval[0]; u32 bmval1 = bmval[1]; struct kstat stat; struct svc_fh tempfh; struct kstatfs statfs; int buflen = *countp << 2; __be32 *attrlenp; u32 dummy; u64 dummy64; u32 rdattr_err = 0; __be32 *p = buffer; __be32 status; int err; int aclsupport = 0; struct nfs4_acl *acl = NULL; BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0); BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1); if (exp->ex_fslocs.migrated) { status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err); if (status) goto out; } err = vfs_getattr(exp->ex_path.mnt, dentry, &stat); if (err) goto out_nfserr; if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | FATTR4_WORD1_SPACE_TOTAL))) { err = vfs_statfs(dentry, &statfs); if (err) goto out_nfserr; } if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { fh_init(&tempfh, NFS4_FHSIZE); status = fh_compose(&tempfh, exp, dentry, NULL); if (status) goto out; fhp = &tempfh; } if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT | FATTR4_WORD0_SUPPORTED_ATTRS)) { err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); aclsupport = (err == 0); if (bmval0 & FATTR4_WORD0_ACL) { if (err == -EOPNOTSUPP) bmval0 &= ~FATTR4_WORD0_ACL; else if (err == -EINVAL) { status = nfserr_attrnotsupp; goto out; } else if (err != 0) goto out_nfserr; } } if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) { if (exp->ex_fslocs.locations == NULL) { bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS; } } if ((buflen -= 16) < 0) goto out_resource; WRITE32(2); WRITE32(bmval0); WRITE32(bmval1); attrlenp = p++; /* to be backfilled later */ if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0; if ((buflen -= 12) < 0) goto out_resource; if (!aclsupport) word0 &= ~FATTR4_WORD0_ACL; if (!exp->ex_fslocs.locations) word0 &= ~FATTR4_WORD0_FS_LOCATIONS; WRITE32(2); WRITE32(word0); WRITE32(NFSD_SUPPORTED_ATTRS_WORD1); } if (bmval0 & FATTR4_WORD0_TYPE) { if ((buflen -= 4) < 0) goto out_resource; dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12]; if (dummy == NF4BAD) goto out_serverfault; WRITE32(dummy); } if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { if ((buflen -= 4) < 0) goto out_resource; if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) WRITE32(NFS4_FH_PERSISTENT); else WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME); } if (bmval0 & FATTR4_WORD0_CHANGE) { /* * Note: This _must_ be consistent with the scheme for writing * change_info, so any changes made here must be reflected there * as well. (See xdr4.h:set_change_info() and the WRITECINFO() * macro above.) */ if ((buflen -= 8) < 0) goto out_resource; WRITE32(stat.ctime.tv_sec); WRITE32(stat.ctime.tv_nsec); } if (bmval0 & FATTR4_WORD0_SIZE) { if ((buflen -= 8) < 0) goto out_resource; WRITE64(stat.size); } if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(1); } if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(1); } if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(0); } if (bmval0 & FATTR4_WORD0_FSID) { if ((buflen -= 16) < 0) goto out_resource; if (exp->ex_fslocs.migrated) { WRITE64(NFS4_REFERRAL_FSID_MAJOR); WRITE64(NFS4_REFERRAL_FSID_MINOR); } else switch(fsid_source(fhp)) { case FSIDSOURCE_FSID: WRITE64((u64)exp->ex_fsid); WRITE64((u64)0); break; case FSIDSOURCE_DEV: WRITE32(0); WRITE32(MAJOR(stat.dev)); WRITE32(0); WRITE32(MINOR(stat.dev)); break; case FSIDSOURCE_UUID: WRITEMEM(exp->ex_uuid, 16); break; } } if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(0); } if (bmval0 & FATTR4_WORD0_LEASE_TIME) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(NFSD_LEASE_TIME); } if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(rdattr_err); } if (bmval0 & FATTR4_WORD0_ACL) { struct nfs4_ace *ace; if (acl == NULL) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(0); goto out_acl; } if ((buflen -= 4) < 0) goto out_resource; WRITE32(acl->naces); for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { if ((buflen -= 4*3) < 0) goto out_resource; WRITE32(ace->type); WRITE32(ace->flag); WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL); status = nfsd4_encode_aclname(rqstp, ace->whotype, ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP, &p, &buflen); if (status == nfserr_resource) goto out_resource; if (status) goto out; } } out_acl: if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(aclsupport ? ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); } if (bmval0 & FATTR4_WORD0_CANSETTIME) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(1); } if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(1); } if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(1); } if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(1); } if (bmval0 & FATTR4_WORD0_FILEHANDLE) { buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4; if (buflen < 0) goto out_resource; WRITE32(fhp->fh_handle.fh_size); WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size); } if (bmval0 & FATTR4_WORD0_FILEID) { if ((buflen -= 8) < 0) goto out_resource; WRITE64(stat.ino); } if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { if ((buflen -= 8) < 0) goto out_resource; WRITE64((u64) statfs.f_ffree); } if (bmval0 & FATTR4_WORD0_FILES_FREE) { if ((buflen -= 8) < 0) goto out_resource; WRITE64((u64) statfs.f_ffree); } if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { if ((buflen -= 8) < 0) goto out_resource; WRITE64((u64) statfs.f_files); } if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) { status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen); if (status == nfserr_resource) goto out_resource; if (status) goto out; } if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(1); } if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { if ((buflen -= 8) < 0) goto out_resource; WRITE64(~(u64)0); } if (bmval0 & FATTR4_WORD0_MAXLINK) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(255); } if (bmval0 & FATTR4_WORD0_MAXNAME) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(statfs.f_namelen); } if (bmval0 & FATTR4_WORD0_MAXREAD) { if ((buflen -= 8) < 0) goto out_resource; WRITE64((u64) svc_max_payload(rqstp)); } if (bmval0 & FATTR4_WORD0_MAXWRITE) { if ((buflen -= 8) < 0) goto out_resource; WRITE64((u64) svc_max_payload(rqstp)); } if (bmval1 & FATTR4_WORD1_MODE) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(stat.mode & S_IALLUGO); } if (bmval1 & FATTR4_WORD1_NO_TRUNC) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(1); } if (bmval1 & FATTR4_WORD1_NUMLINKS) { if ((buflen -= 4) < 0) goto out_resource; WRITE32(stat.nlink); } if (bmval1 & FATTR4_WORD1_OWNER) { status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen); if (status == nfserr_resource) goto out_resource; if (status) goto out; } if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen); if (status == nfserr_resource) goto out_resource; if (status) goto out; } if (bmval1 & FATTR4_WORD1_RAWDEV) { if ((buflen -= 8) < 0) goto out_resource; WRITE32((u32) MAJOR(stat.rdev)); WRITE32((u32) MINOR(stat.rdev)); } if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { if ((buflen -= 8) < 0) goto out_resource; dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; WRITE64(dummy64); } if (bmval1 & FATTR4_WORD1_SPACE_FREE) { if ((buflen -= 8) < 0) goto out_resource; dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; WRITE64(dummy64); } if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { if ((buflen -= 8) < 0) goto out_resource; dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; WRITE64(dummy64); } if (bmval1 & FATTR4_WORD1_SPACE_USED) { if ((buflen -= 8) < 0) goto out_resource; dummy64 = (u64)stat.blocks << 9; WRITE64(dummy64); } if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { if ((buflen -= 12) < 0) goto out_resource; WRITE32(0); WRITE32(stat.atime.tv_sec); WRITE32(stat.atime.tv_nsec); } if (bmval1 & FATTR4_WORD1_TIME_DELTA) { if ((buflen -= 12) < 0) goto out_resource; WRITE32(0); WRITE32(1); WRITE32(0); } if (bmval1 & FATTR4_WORD1_TIME_METADATA) { if ((buflen -= 12) < 0) goto out_resource; WRITE32(0); WRITE32(stat.ctime.tv_sec); WRITE32(stat.ctime.tv_nsec); } if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { if ((buflen -= 12) < 0) goto out_resource; WRITE32(0); WRITE32(stat.mtime.tv_sec); WRITE32(stat.mtime.tv_nsec); } if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { if ((buflen -= 8) < 0) goto out_resource; /* * Get parent's attributes if not ignoring crossmount * and this is the root of a cross-mounted filesystem. */ if (ignore_crossmnt == 0 && exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) { err = vfs_getattr(exp->ex_path.mnt->mnt_parent, exp->ex_path.mnt->mnt_mountpoint, &stat); if (err) goto out_nfserr; } WRITE64(stat.ino); } *attrlenp = htonl((char *)p - (char *)attrlenp - 4); *countp = p - buffer; status = nfs_ok; out: kfree(acl); if (fhp == &tempfh) fh_put(&tempfh); return status; out_nfserr: status = nfserrno(err); goto out; out_resource: *countp = 0; status = nfserr_resource; goto out; out_serverfault: status = nfserr_serverfault; goto out; } static inline int attributes_need_mount(u32 *bmval) { if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) return 1; if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) return 1; return 0; } static __be32 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd, const char *name, int namlen, __be32 *p, int *buflen) { struct svc_export *exp = cd->rd_fhp->fh_export; struct dentry *dentry; __be32 nfserr; int ignore_crossmnt = 0; dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen); if (IS_ERR(dentry)) return nfserrno(PTR_ERR(dentry)); exp_get(exp); /* * In the case of a mountpoint, the client may be asking for * attributes that are only properties of the underlying filesystem * as opposed to the cross-mounted file system. In such a case, * we will not follow the cross mount and will fill the attribtutes * directly from the mountpoint dentry. */ if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval)) ignore_crossmnt = 1; else if (d_mountpoint(dentry)) { int err; /* * Why the heck aren't we just using nfsd_lookup?? * Different "."/".." handling? Something else? * At least, add a comment here to explain.... */ err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); if (err) { nfserr = nfserrno(err); goto out_put; } nfserr = check_nfsd_access(exp, cd->rd_rqstp); if (nfserr) goto out_put; } nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval, cd->rd_rqstp, ignore_crossmnt); out_put: dput(dentry); exp_put(exp); return nfserr; } static __be32 * nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr) { __be32 *attrlenp; if (buflen < 6) return NULL; *p++ = htonl(2); *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ *p++ = htonl(0); /* bmval1 */ attrlenp = p++; *p++ = nfserr; /* no htonl */ *attrlenp = htonl((char *)p - (char *)attrlenp - 4); return p; } static int nfsd4_encode_dirent(void *ccdv, const char *name, int namlen, loff_t offset, u64 ino, unsigned int d_type) { struct readdir_cd *ccd = ccdv; struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); int buflen; __be32 *p = cd->buffer; __be32 nfserr = nfserr_toosmall; /* In nfsv4, "." and ".." never make it onto the wire.. */ if (name && isdotent(name, namlen)) { cd->common.err = nfs_ok; return 0; } if (cd->offset) xdr_encode_hyper(cd->offset, (u64) offset); buflen = cd->buflen - 4 - XDR_QUADLEN(namlen); if (buflen < 0) goto fail; *p++ = xdr_one; /* mark entry present */ cd->offset = p; /* remember pointer */ p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */ p = xdr_encode_array(p, name, namlen); /* name length & name */ nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen); switch (nfserr) { case nfs_ok: p += buflen; break; case nfserr_resource: nfserr = nfserr_toosmall; goto fail; case nfserr_dropit: goto fail; default: /* * If the client requested the RDATTR_ERROR attribute, * we stuff the error code into this attribute * and continue. If this attribute was not requested, * then in accordance with the spec, we fail the * entire READDIR operation(!) */ if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) goto fail; p = nfsd4_encode_rdattr_error(p, buflen, nfserr); if (p == NULL) { nfserr = nfserr_toosmall; goto fail; } } cd->buflen -= (p - cd->buffer); cd->buffer = p; cd->common.err = nfs_ok; return 0; fail: cd->common.err = nfserr; return -EINVAL; } static __be32 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access) { ENCODE_HEAD; if (!nfserr) { RESERVE_SPACE(8); WRITE32(access->ac_supported); WRITE32(access->ac_resp_access); ADJUST_ARGS(); } return nfserr; } static __be32 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close) { ENCODE_SEQID_OP_HEAD; if (!nfserr) { RESERVE_SPACE(sizeof(stateid_t)); WRITE32(close->cl_stateid.si_generation); WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t)); ADJUST_ARGS(); } ENCODE_SEQID_OP_TAIL(close->cl_stateowner); return nfserr; } static __be32 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit) { ENCODE_HEAD; if (!nfserr) { RESERVE_SPACE(8); WRITEMEM(commit->co_verf.data, 8); ADJUST_ARGS(); } return nfserr; } static __be32 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create) { ENCODE_HEAD; if (!nfserr) { RESERVE_SPACE(32); WRITECINFO(create->cr_cinfo); WRITE32(2); WRITE32(create->cr_bmval[0]); WRITE32(create->cr_bmval[1]); ADJUST_ARGS(); } return nfserr; } static __be32 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr) { struct svc_fh *fhp = getattr->ga_fhp; int buflen; if (nfserr) return nfserr; buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2); nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry, resp->p, &buflen, getattr->ga_bmval, resp->rqstp, 0); if (!nfserr) resp->p += buflen; return nfserr; } static __be32 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp) { struct svc_fh *fhp = *fhpp; unsigned int len; ENCODE_HEAD; if (!nfserr) { len = fhp->fh_handle.fh_size; RESERVE_SPACE(len + 4); WRITE32(len); WRITEMEM(&fhp->fh_handle.fh_base, len); ADJUST_ARGS(); } return nfserr; } /* * Including all fields other than the name, a LOCK4denied structure requires * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. */ static void nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld) { ENCODE_HEAD; RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0)); WRITE64(ld->ld_start); WRITE64(ld->ld_length); WRITE32(ld->ld_type); if (ld->ld_sop) { WRITEMEM(&ld->ld_clientid, 8); WRITE32(ld->ld_sop->so_owner.len); WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len); kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner); } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ WRITE64((u64)0); /* clientid */ WRITE32(0); /* length of owner name */ } ADJUST_ARGS(); } static __be32 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock) { ENCODE_SEQID_OP_HEAD; if (!nfserr) { RESERVE_SPACE(4 + sizeof(stateid_t)); WRITE32(lock->lk_resp_stateid.si_generation); WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t)); ADJUST_ARGS(); } else if (nfserr == nfserr_denied) nfsd4_encode_lock_denied(resp, &lock->lk_denied); ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner); return nfserr; } static __be32 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt) { if (nfserr == nfserr_denied) nfsd4_encode_lock_denied(resp, &lockt->lt_denied); return nfserr; } static __be32 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku) { ENCODE_SEQID_OP_HEAD; if (!nfserr) { RESERVE_SPACE(sizeof(stateid_t)); WRITE32(locku->lu_stateid.si_generation); WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t)); ADJUST_ARGS(); } ENCODE_SEQID_OP_TAIL(locku->lu_stateowner); return nfserr; } static __be32 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link) { ENCODE_HEAD; if (!nfserr) { RESERVE_SPACE(20); WRITECINFO(link->li_cinfo); ADJUST_ARGS(); } return nfserr; } static __be32 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open) { ENCODE_SEQID_OP_HEAD; if (nfserr) goto out; RESERVE_SPACE(36 + sizeof(stateid_t)); WRITE32(open->op_stateid.si_generation); WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t)); WRITECINFO(open->op_cinfo); WRITE32(open->op_rflags); WRITE32(2); WRITE32(open->op_bmval[0]); WRITE32(open->op_bmval[1]); WRITE32(open->op_delegate_type); ADJUST_ARGS(); switch (open->op_delegate_type) { case NFS4_OPEN_DELEGATE_NONE: break; case NFS4_OPEN_DELEGATE_READ: RESERVE_SPACE(20 + sizeof(stateid_t)); WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t)); WRITE32(open->op_recall); /* * TODO: ACE's in delegations */ WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); WRITE32(0); WRITE32(0); WRITE32(0); /* XXX: is NULL principal ok? */ ADJUST_ARGS(); break; case NFS4_OPEN_DELEGATE_WRITE: RESERVE_SPACE(32 + sizeof(stateid_t)); WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t)); WRITE32(0); /* * TODO: space_limit's in delegations */ WRITE32(NFS4_LIMIT_SIZE); WRITE32(~(u32)0); WRITE32(~(u32)0); /* * TODO: ACE's in delegations */ WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); WRITE32(0); WRITE32(0); WRITE32(0); /* XXX: is NULL principal ok? */ ADJUST_ARGS(); break; default: BUG(); } /* XXX save filehandle here */ out: ENCODE_SEQID_OP_TAIL(open->op_stateowner); return nfserr; } static __be32 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc) { ENCODE_SEQID_OP_HEAD; if (!nfserr) { RESERVE_SPACE(sizeof(stateid_t)); WRITE32(oc->oc_resp_stateid.si_generation); WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t)); ADJUST_ARGS(); } ENCODE_SEQID_OP_TAIL(oc->oc_stateowner); return nfserr; } static __be32 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od) { ENCODE_SEQID_OP_HEAD; if (!nfserr) { RESERVE_SPACE(sizeof(stateid_t)); WRITE32(od->od_stateid.si_generation); WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t)); ADJUST_ARGS(); } ENCODE_SEQID_OP_TAIL(od->od_stateowner); return nfserr; } static __be32 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_read *read) { u32 eof; int v, pn; unsigned long maxcount; long len; ENCODE_HEAD; if (nfserr) return nfserr; if (resp->xbuf->page_len) return nfserr_resource; RESERVE_SPACE(8); /* eof flag and byte count */ maxcount = svc_max_payload(resp->rqstp); if (maxcount > read->rd_length) maxcount = read->rd_length; len = maxcount; v = 0; while (len > 0) { pn = resp->rqstp->rq_resused++; resp->rqstp->rq_vec[v].iov_base = page_address(resp->rqstp->rq_respages[pn]); resp->rqstp->rq_vec[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE; v++; len -= PAGE_SIZE; } read->rd_vlen = v; nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp, read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen, &maxcount); if (nfserr == nfserr_symlink) nfserr = nfserr_inval; if (nfserr) return nfserr; eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size); WRITE32(eof); WRITE32(maxcount); ADJUST_ARGS(); resp->xbuf->head[0].iov_len = (char*)p - (char*)resp->xbuf->head[0].iov_base; resp->xbuf->page_len = maxcount; /* Use rest of head for padding and remaining ops: */ resp->xbuf->tail[0].iov_base = p; resp->xbuf->tail[0].iov_len = 0; if (maxcount&3) { RESERVE_SPACE(4); WRITE32(0); resp->xbuf->tail[0].iov_base += maxcount&3; resp->xbuf->tail[0].iov_len = 4 - (maxcount&3); ADJUST_ARGS(); } return 0; } static __be32 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink) { int maxcount; char *page; ENCODE_HEAD; if (nfserr) return nfserr; if (resp->xbuf->page_len) return nfserr_resource; page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]); maxcount = PAGE_SIZE; RESERVE_SPACE(4); /* * XXX: By default, the ->readlink() VFS op will truncate symlinks * if they would overflow the buffer. Is this kosher in NFSv4? If * not, one easy fix is: if ->readlink() precisely fills the buffer, * assume that truncation occurred, and return NFS4ERR_RESOURCE. */ nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount); if (nfserr == nfserr_isdir) return nfserr_inval; if (nfserr) return nfserr; WRITE32(maxcount); ADJUST_ARGS(); resp->xbuf->head[0].iov_len = (char*)p - (char*)resp->xbuf->head[0].iov_base; resp->xbuf->page_len = maxcount; /* Use rest of head for padding and remaining ops: */ resp->xbuf->tail[0].iov_base = p; resp->xbuf->tail[0].iov_len = 0; if (maxcount&3) { RESERVE_SPACE(4); WRITE32(0); resp->xbuf->tail[0].iov_base += maxcount&3; resp->xbuf->tail[0].iov_len = 4 - (maxcount&3); ADJUST_ARGS(); } return 0; } static __be32 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir) { int maxcount; loff_t offset; __be32 *page, *savep, *tailbase; ENCODE_HEAD; if (nfserr) return nfserr; if (resp->xbuf->page_len) return nfserr_resource; RESERVE_SPACE(8); /* verifier */ savep = p; /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ WRITE32(0); WRITE32(0); ADJUST_ARGS(); resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base; tailbase = p; maxcount = PAGE_SIZE; if (maxcount > readdir->rd_maxcount) maxcount = readdir->rd_maxcount; /* * Convert from bytes to words, account for the two words already * written, make sure to leave two words at the end for the next * pointer and eof field. */ maxcount = (maxcount >> 2) - 4; if (maxcount < 0) { nfserr = nfserr_toosmall; goto err_no_verf; } page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]); readdir->common.err = 0; readdir->buflen = maxcount; readdir->buffer = page; readdir->offset = NULL; offset = readdir->rd_cookie; nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, &offset, &readdir->common, nfsd4_encode_dirent); if (nfserr == nfs_ok && readdir->common.err == nfserr_toosmall && readdir->buffer == page) nfserr = nfserr_toosmall; if (nfserr == nfserr_symlink) nfserr = nfserr_notdir; if (nfserr) goto err_no_verf; if (readdir->offset) xdr_encode_hyper(readdir->offset, offset); p = readdir->buffer; *p++ = 0; /* no more entries */ *p++ = htonl(readdir->common.err == nfserr_eof); resp->xbuf->page_len = ((char*)p) - (char*)page_address( resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); /* Use rest of head for padding and remaining ops: */ resp->xbuf->tail[0].iov_base = tailbase; resp->xbuf->tail[0].iov_len = 0; resp->p = resp->xbuf->tail[0].iov_base; resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4; return 0; err_no_verf: p = savep; ADJUST_ARGS(); return nfserr; } static __be32 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove) { ENCODE_HEAD; if (!nfserr) { RESERVE_SPACE(20); WRITECINFO(remove->rm_cinfo); ADJUST_ARGS(); } return nfserr; } static __be32 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename) { ENCODE_HEAD; if (!nfserr) { RESERVE_SPACE(40); WRITECINFO(rename->rn_sinfo); WRITECINFO(rename->rn_tinfo); ADJUST_ARGS(); } return nfserr; } static __be32 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_secinfo *secinfo) { int i = 0; struct svc_export *exp = secinfo->si_exp; u32 nflavs; struct exp_flavor_info *flavs; struct exp_flavor_info def_flavs[2]; ENCODE_HEAD; if (nfserr) goto out; if (exp->ex_nflavors) { flavs = exp->ex_flavors; nflavs = exp->ex_nflavors; } else { /* Handling of some defaults in absence of real secinfo: */ flavs = def_flavs; if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { nflavs = 2; flavs[0].pseudoflavor = RPC_AUTH_UNIX; flavs[1].pseudoflavor = RPC_AUTH_NULL; } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { nflavs = 1; flavs[0].pseudoflavor = svcauth_gss_flavor(exp->ex_client); } else { nflavs = 1; flavs[0].pseudoflavor = exp->ex_client->flavour->flavour; } } RESERVE_SPACE(4); WRITE32(nflavs); ADJUST_ARGS(); for (i = 0; i < nflavs; i++) { u32 flav = flavs[i].pseudoflavor; struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav); if (gm) { RESERVE_SPACE(4); WRITE32(RPC_AUTH_GSS); ADJUST_ARGS(); RESERVE_SPACE(4 + gm->gm_oid.len); WRITE32(gm->gm_oid.len); WRITEMEM(gm->gm_oid.data, gm->gm_oid.len); ADJUST_ARGS(); RESERVE_SPACE(4); WRITE32(0); /* qop */ ADJUST_ARGS(); RESERVE_SPACE(4); WRITE32(gss_pseudoflavor_to_service(gm, flav)); ADJUST_ARGS(); gss_mech_put(gm); } else { RESERVE_SPACE(4); WRITE32(flav); ADJUST_ARGS(); } } out: if (exp) exp_put(exp); return nfserr; } /* * The SETATTR encode routine is special -- it always encodes a bitmap, * regardless of the error status. */ static __be32 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr) { ENCODE_HEAD; RESERVE_SPACE(12); if (nfserr) { WRITE32(2); WRITE32(0); WRITE32(0); } else { WRITE32(2); WRITE32(setattr->sa_bmval[0]); WRITE32(setattr->sa_bmval[1]); } ADJUST_ARGS(); return nfserr; } static __be32 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd) { ENCODE_HEAD; if (!nfserr) { RESERVE_SPACE(8 + sizeof(nfs4_verifier)); WRITEMEM(&scd->se_clientid, 8); WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier)); ADJUST_ARGS(); } else if (nfserr == nfserr_clid_inuse) { RESERVE_SPACE(8); WRITE32(0); WRITE32(0); ADJUST_ARGS(); } return nfserr; } static __be32 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write) { ENCODE_HEAD; if (!nfserr) { RESERVE_SPACE(16); WRITE32(write->wr_bytes_written); WRITE32(write->wr_how_written); WRITEMEM(write->wr_verifier.data, 8); ADJUST_ARGS(); } return nfserr; } static __be32 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p) { return nfserr; } typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *); static nfsd4_enc nfsd4_enc_ops[] = { [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access, [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close, [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit, [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create, [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop, [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop, [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr, [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh, [OP_LINK] = (nfsd4_enc)nfsd4_encode_link, [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock, [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt, [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku, [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop, [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop, [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop, [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open, [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm, [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade, [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop, [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop, [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop, [OP_READ] = (nfsd4_enc)nfsd4_encode_read, [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir, [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink, [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove, [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename, [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop, [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop, [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop, [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo, [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr, [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid, [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop, [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop, [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write, [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop, }; void nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) { __be32 *statp; ENCODE_HEAD; RESERVE_SPACE(8); WRITE32(op->opnum); statp = p++; /* to be backfilled at the end */ ADJUST_ARGS(); if (op->opnum == OP_ILLEGAL) goto status; BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || !nfsd4_enc_ops[op->opnum]); op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u); status: /* * Note: We write the status directly, instead of using WRITE32(), * since it is already in network byte order. */ *statp = op->status; } /* * Encode the reply stored in the stateowner reply cache * * XDR note: do not encode rp->rp_buflen: the buffer contains the * previously sent already encoded operation. * * called with nfs4_lock_state() held */ void nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op) { ENCODE_HEAD; struct nfs4_replay *rp = op->replay; BUG_ON(!rp); RESERVE_SPACE(8); WRITE32(op->opnum); *p++ = rp->rp_status; /* already xdr'ed */ ADJUST_ARGS(); RESERVE_SPACE(rp->rp_buflen); WRITEMEM(rp->rp_buf, rp->rp_buflen); ADJUST_ARGS(); } /* * END OF "GENERIC" ENCODE ROUTINES. */ int nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) { return xdr_ressize_check(rqstp, p); } void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args) { if (args->ops != args->iops) { kfree(args->ops); args->ops = args->iops; } kfree(args->tmpp); args->tmpp = NULL; while (args->to_free) { struct tmpbuf *tb = args->to_free; args->to_free = tb->next; tb->release(tb->buf); kfree(tb); } } int nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args) { __be32 status; args->p = p; args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len; args->pagelist = rqstp->rq_arg.pages; args->pagelen = rqstp->rq_arg.page_len; args->tmpp = NULL; args->to_free = NULL; args->ops = args->iops; args->rqstp = rqstp; status = nfsd4_decode_compound(args); if (status) { nfsd4_release_compoundargs(args); } return !status; } int nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp) { /* * All that remains is to write the tag and operation count... */ struct kvec *iov; p = resp->tagp; *p++ = htonl(resp->taglen); memcpy(p, resp->tag, resp->taglen); p += XDR_QUADLEN(resp->taglen); *p++ = htonl(resp->opcnt); if (rqstp->rq_res.page_len) iov = &rqstp->rq_res.tail[0]; else iov = &rqstp->rq_res.head[0]; iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base; BUG_ON(iov->iov_len > PAGE_SIZE); return 1; } /* * Local variables: * c-basic-offset: 8 * End: */