1147 lines
27 KiB
C
1147 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* XDR support for nfsd/protocol version 3.
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*
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* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
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*
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* 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
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*/
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#include <linux/namei.h>
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#include <linux/sunrpc/svc_xprt.h>
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#include "xdr3.h"
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#include "auth.h"
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#include "netns.h"
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#include "vfs.h"
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#define NFSDDBG_FACILITY NFSDDBG_XDR
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/*
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* Mapping of S_IF* types to NFS file types
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*/
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static u32 nfs3_ftypes[] = {
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NF3NON, NF3FIFO, NF3CHR, NF3BAD,
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NF3DIR, NF3BAD, NF3BLK, NF3BAD,
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NF3REG, NF3BAD, NF3LNK, NF3BAD,
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NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
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};
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/*
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* XDR functions for basic NFS types
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*/
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static __be32 *
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encode_time3(__be32 *p, struct timespec *time)
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{
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*p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
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return p;
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}
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static __be32 *
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decode_time3(__be32 *p, struct timespec *time)
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{
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time->tv_sec = ntohl(*p++);
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time->tv_nsec = ntohl(*p++);
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return p;
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}
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static __be32 *
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decode_fh(__be32 *p, struct svc_fh *fhp)
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{
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unsigned int size;
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fh_init(fhp, NFS3_FHSIZE);
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size = ntohl(*p++);
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if (size > NFS3_FHSIZE)
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return NULL;
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memcpy(&fhp->fh_handle.fh_base, p, size);
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fhp->fh_handle.fh_size = size;
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return p + XDR_QUADLEN(size);
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}
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/* Helper function for NFSv3 ACL code */
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__be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
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{
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return decode_fh(p, fhp);
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}
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static __be32 *
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encode_fh(__be32 *p, struct svc_fh *fhp)
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{
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unsigned int size = fhp->fh_handle.fh_size;
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*p++ = htonl(size);
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if (size) p[XDR_QUADLEN(size)-1]=0;
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memcpy(p, &fhp->fh_handle.fh_base, size);
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return p + XDR_QUADLEN(size);
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}
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/*
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* Decode a file name and make sure that the path contains
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* no slashes or null bytes.
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*/
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static __be32 *
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decode_filename(__be32 *p, char **namp, unsigned int *lenp)
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{
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char *name;
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unsigned int i;
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if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
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for (i = 0, name = *namp; i < *lenp; i++, name++) {
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if (*name == '\0' || *name == '/')
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return NULL;
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}
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}
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return p;
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}
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static __be32 *
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decode_sattr3(__be32 *p, struct iattr *iap)
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{
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u32 tmp;
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iap->ia_valid = 0;
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if (*p++) {
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iap->ia_valid |= ATTR_MODE;
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iap->ia_mode = ntohl(*p++);
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}
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if (*p++) {
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iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
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if (uid_valid(iap->ia_uid))
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iap->ia_valid |= ATTR_UID;
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}
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if (*p++) {
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iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
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if (gid_valid(iap->ia_gid))
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iap->ia_valid |= ATTR_GID;
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}
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if (*p++) {
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u64 newsize;
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iap->ia_valid |= ATTR_SIZE;
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p = xdr_decode_hyper(p, &newsize);
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iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
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}
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if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
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iap->ia_valid |= ATTR_ATIME;
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} else if (tmp == 2) { /* set to client time */
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iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
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iap->ia_atime.tv_sec = ntohl(*p++);
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iap->ia_atime.tv_nsec = ntohl(*p++);
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}
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if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
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iap->ia_valid |= ATTR_MTIME;
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} else if (tmp == 2) { /* set to client time */
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iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
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iap->ia_mtime.tv_sec = ntohl(*p++);
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iap->ia_mtime.tv_nsec = ntohl(*p++);
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}
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return p;
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}
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static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
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{
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u64 f;
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switch(fsid_source(fhp)) {
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default:
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case FSIDSOURCE_DEV:
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p = xdr_encode_hyper(p, (u64)huge_encode_dev
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(fhp->fh_dentry->d_sb->s_dev));
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break;
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case FSIDSOURCE_FSID:
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p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
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break;
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case FSIDSOURCE_UUID:
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f = ((u64*)fhp->fh_export->ex_uuid)[0];
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f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
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p = xdr_encode_hyper(p, f);
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break;
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}
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return p;
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}
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static __be32 *
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encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
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struct kstat *stat)
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{
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struct timespec ts;
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*p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
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*p++ = htonl((u32) (stat->mode & S_IALLUGO));
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*p++ = htonl((u32) stat->nlink);
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*p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
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*p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
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if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
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p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
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} else {
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p = xdr_encode_hyper(p, (u64) stat->size);
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}
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p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
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*p++ = htonl((u32) MAJOR(stat->rdev));
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*p++ = htonl((u32) MINOR(stat->rdev));
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p = encode_fsid(p, fhp);
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p = xdr_encode_hyper(p, stat->ino);
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ts = timespec64_to_timespec(stat->atime);
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p = encode_time3(p, &ts);
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ts = timespec64_to_timespec(stat->mtime);
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p = encode_time3(p, &ts);
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ts = timespec64_to_timespec(stat->ctime);
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p = encode_time3(p, &ts);
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return p;
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}
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static __be32 *
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encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
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{
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/* Attributes to follow */
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*p++ = xdr_one;
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return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
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}
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/*
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* Encode post-operation attributes.
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* The inode may be NULL if the call failed because of a stale file
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* handle. In this case, no attributes are returned.
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*/
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static __be32 *
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encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
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{
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struct dentry *dentry = fhp->fh_dentry;
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if (dentry && d_really_is_positive(dentry)) {
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__be32 err;
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struct kstat stat;
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err = fh_getattr(fhp, &stat);
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if (!err) {
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*p++ = xdr_one; /* attributes follow */
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lease_get_mtime(d_inode(dentry), &stat.mtime);
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return encode_fattr3(rqstp, p, fhp, &stat);
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}
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}
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*p++ = xdr_zero;
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return p;
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}
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/* Helper for NFSv3 ACLs */
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__be32 *
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nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
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{
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return encode_post_op_attr(rqstp, p, fhp);
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}
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/*
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* Enocde weak cache consistency data
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*/
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static __be32 *
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encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
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{
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struct dentry *dentry = fhp->fh_dentry;
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if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
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if (fhp->fh_pre_saved) {
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*p++ = xdr_one;
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p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
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p = encode_time3(p, &fhp->fh_pre_mtime);
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p = encode_time3(p, &fhp->fh_pre_ctime);
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} else {
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*p++ = xdr_zero;
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}
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return encode_saved_post_attr(rqstp, p, fhp);
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}
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/* no pre- or post-attrs */
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*p++ = xdr_zero;
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return encode_post_op_attr(rqstp, p, fhp);
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}
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/*
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* Fill in the pre_op attr for the wcc data
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*/
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void fill_pre_wcc(struct svc_fh *fhp)
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{
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struct inode *inode;
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struct kstat stat;
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__be32 err;
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if (fhp->fh_pre_saved)
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return;
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inode = d_inode(fhp->fh_dentry);
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err = fh_getattr(fhp, &stat);
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if (err) {
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/* Grab the times from inode anyway */
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stat.mtime = inode->i_mtime;
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stat.ctime = inode->i_ctime;
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stat.size = inode->i_size;
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}
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fhp->fh_pre_mtime = timespec64_to_timespec(stat.mtime);
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fhp->fh_pre_ctime = timespec64_to_timespec(stat.ctime);
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fhp->fh_pre_size = stat.size;
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fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
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fhp->fh_pre_saved = true;
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}
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/*
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* Fill in the post_op attr for the wcc data
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*/
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void fill_post_wcc(struct svc_fh *fhp)
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{
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__be32 err;
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if (fhp->fh_post_saved)
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printk("nfsd: inode locked twice during operation.\n");
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err = fh_getattr(fhp, &fhp->fh_post_attr);
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fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr,
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d_inode(fhp->fh_dentry));
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if (err) {
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fhp->fh_post_saved = false;
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/* Grab the ctime anyway - set_change_info might use it */
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fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
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} else
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fhp->fh_post_saved = true;
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}
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/*
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* XDR decode functions
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*/
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int
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nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_fhandle *args = rqstp->rq_argp;
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd3_sattrargs *args = rqstp->rq_argp;
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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p = decode_sattr3(p, &args->attrs);
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if ((args->check_guard = ntohl(*p++)) != 0) {
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struct timespec time;
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p = decode_time3(p, &time);
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args->guardtime = time.tv_sec;
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}
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd3_diropargs *args = rqstp->rq_argp;
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if (!(p = decode_fh(p, &args->fh))
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|| !(p = decode_filename(p, &args->name, &args->len)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd3_accessargs *args = rqstp->rq_argp;
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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args->access = ntohl(*p++);
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd3_readargs *args = rqstp->rq_argp;
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unsigned int len;
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int v;
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u32 max_blocksize = svc_max_payload(rqstp);
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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p = xdr_decode_hyper(p, &args->offset);
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args->count = ntohl(*p++);
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len = min(args->count, max_blocksize);
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/* set up the kvec */
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v=0;
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while (len > 0) {
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struct page *p = *(rqstp->rq_next_page++);
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rqstp->rq_vec[v].iov_base = page_address(p);
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rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
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len -= rqstp->rq_vec[v].iov_len;
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v++;
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}
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args->vlen = v;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd3_writeargs *args = rqstp->rq_argp;
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unsigned int len, hdr, dlen;
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u32 max_blocksize = svc_max_payload(rqstp);
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struct kvec *head = rqstp->rq_arg.head;
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struct kvec *tail = rqstp->rq_arg.tail;
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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p = xdr_decode_hyper(p, &args->offset);
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args->count = ntohl(*p++);
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args->stable = ntohl(*p++);
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len = args->len = ntohl(*p++);
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if ((void *)p > head->iov_base + head->iov_len)
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return 0;
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/*
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* The count must equal the amount of data passed.
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*/
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if (args->count != args->len)
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return 0;
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/*
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* Check to make sure that we got the right number of
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* bytes.
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*/
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hdr = (void*)p - head->iov_base;
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dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
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/*
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* Round the length of the data which was specified up to
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* the next multiple of XDR units and then compare that
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* against the length which was actually received.
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* Note that when RPCSEC/GSS (for example) is used, the
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* data buffer can be padded so dlen might be larger
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* than required. It must never be smaller.
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*/
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if (dlen < XDR_QUADLEN(len)*4)
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return 0;
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if (args->count > max_blocksize) {
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args->count = max_blocksize;
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len = args->len = max_blocksize;
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}
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args->first.iov_base = (void *)p;
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args->first.iov_len = head->iov_len - hdr;
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return 1;
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}
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int
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nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd3_createargs *args = rqstp->rq_argp;
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if (!(p = decode_fh(p, &args->fh))
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|| !(p = decode_filename(p, &args->name, &args->len)))
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return 0;
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switch (args->createmode = ntohl(*p++)) {
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case NFS3_CREATE_UNCHECKED:
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case NFS3_CREATE_GUARDED:
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p = decode_sattr3(p, &args->attrs);
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break;
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case NFS3_CREATE_EXCLUSIVE:
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args->verf = p;
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p += 2;
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break;
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default:
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return 0;
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}
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd3_createargs *args = rqstp->rq_argp;
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if (!(p = decode_fh(p, &args->fh)) ||
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!(p = decode_filename(p, &args->name, &args->len)))
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return 0;
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p = decode_sattr3(p, &args->attrs);
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
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{
|
|
struct nfsd3_symlinkargs *args = rqstp->rq_argp;
|
|
char *base = (char *)p;
|
|
size_t dlen;
|
|
|
|
if (!(p = decode_fh(p, &args->ffh)) ||
|
|
!(p = decode_filename(p, &args->fname, &args->flen)))
|
|
return 0;
|
|
p = decode_sattr3(p, &args->attrs);
|
|
|
|
args->tlen = ntohl(*p++);
|
|
|
|
args->first.iov_base = p;
|
|
args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
|
|
args->first.iov_len -= (char *)p - base;
|
|
|
|
dlen = args->first.iov_len + rqstp->rq_arg.page_len +
|
|
rqstp->rq_arg.tail[0].iov_len;
|
|
if (dlen < XDR_QUADLEN(args->tlen) << 2)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_mknodargs *args = rqstp->rq_argp;
|
|
|
|
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)
|
|
p = decode_sattr3(p, &args->attrs);
|
|
|
|
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, __be32 *p)
|
|
{
|
|
struct nfsd3_renameargs *args = rqstp->rq_argp;
|
|
|
|
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, __be32 *p)
|
|
{
|
|
struct nfsd3_readlinkargs *args = rqstp->rq_argp;
|
|
|
|
p = decode_fh(p, &args->fh);
|
|
if (!p)
|
|
return 0;
|
|
args->buffer = page_address(*(rqstp->rq_next_page++));
|
|
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_linkargs *args = rqstp->rq_argp;
|
|
|
|
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, __be32 *p)
|
|
{
|
|
struct nfsd3_readdirargs *args = rqstp->rq_argp;
|
|
p = decode_fh(p, &args->fh);
|
|
if (!p)
|
|
return 0;
|
|
p = xdr_decode_hyper(p, &args->cookie);
|
|
args->verf = p; p += 2;
|
|
args->dircount = ~0;
|
|
args->count = ntohl(*p++);
|
|
args->count = min_t(u32, args->count, PAGE_SIZE);
|
|
args->buffer = page_address(*(rqstp->rq_next_page++));
|
|
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_readdirargs *args = rqstp->rq_argp;
|
|
int len;
|
|
u32 max_blocksize = svc_max_payload(rqstp);
|
|
|
|
p = decode_fh(p, &args->fh);
|
|
if (!p)
|
|
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 = min(args->count, max_blocksize);
|
|
while (len > 0) {
|
|
struct page *p = *(rqstp->rq_next_page++);
|
|
if (!args->buffer)
|
|
args->buffer = page_address(p);
|
|
len -= PAGE_SIZE;
|
|
}
|
|
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_commitargs *args = rqstp->rq_argp;
|
|
p = decode_fh(p, &args->fh);
|
|
if (!p)
|
|
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, __be32 *p)
|
|
{
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
/* GETATTR */
|
|
int
|
|
nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_attrstat *resp = rqstp->rq_resp;
|
|
|
|
if (resp->status == 0) {
|
|
lease_get_mtime(d_inode(resp->fh.fh_dentry),
|
|
&resp->stat.mtime);
|
|
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, __be32 *p)
|
|
{
|
|
struct nfsd3_attrstat *resp = rqstp->rq_resp;
|
|
|
|
p = encode_wcc_data(rqstp, p, &resp->fh);
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
/* LOOKUP */
|
|
int
|
|
nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_diropres *resp = rqstp->rq_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, __be32 *p)
|
|
{
|
|
struct nfsd3_accessres *resp = rqstp->rq_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, __be32 *p)
|
|
{
|
|
struct nfsd3_readlinkres *resp = rqstp->rq_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_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, __be32 *p)
|
|
{
|
|
struct nfsd3_readres *resp = rqstp->rq_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 as well */
|
|
rqstp->rq_res.page_len = resp->count;
|
|
if (resp->count & 3) {
|
|
/* need to pad the tail */
|
|
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, __be32 *p)
|
|
{
|
|
struct nfsd3_writeres *resp = rqstp->rq_resp;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
p = encode_wcc_data(rqstp, p, &resp->fh);
|
|
if (resp->status == 0) {
|
|
*p++ = htonl(resp->count);
|
|
*p++ = htonl(resp->committed);
|
|
/* unique identifier, y2038 overflow can be ignored */
|
|
*p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
|
|
*p++ = htonl(nn->nfssvc_boot.tv_nsec);
|
|
}
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
/* CREATE, MKDIR, SYMLINK, MKNOD */
|
|
int
|
|
nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_diropres *resp = rqstp->rq_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, __be32 *p)
|
|
{
|
|
struct nfsd3_renameres *resp = rqstp->rq_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, __be32 *p)
|
|
{
|
|
struct nfsd3_linkres *resp = rqstp->rq_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, __be32 *p)
|
|
{
|
|
struct nfsd3_readdirres *resp = rqstp->rq_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_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 __be32 *
|
|
encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
|
|
int namlen, u64 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 __be32
|
|
compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
|
|
const char *name, int namlen, u64 ino)
|
|
{
|
|
struct svc_export *exp;
|
|
struct dentry *dparent, *dchild;
|
|
__be32 rv = nfserr_noent;
|
|
|
|
dparent = cd->fh.fh_dentry;
|
|
exp = cd->fh.fh_export;
|
|
|
|
if (isdotent(name, namlen)) {
|
|
if (namlen == 2) {
|
|
dchild = dget_parent(dparent);
|
|
/* filesystem root - cannot return filehandle for ".." */
|
|
if (dchild == dparent)
|
|
goto out;
|
|
} else
|
|
dchild = dget(dparent);
|
|
} else
|
|
dchild = lookup_one_len_unlocked(name, dparent, namlen);
|
|
if (IS_ERR(dchild))
|
|
return rv;
|
|
if (d_mountpoint(dchild))
|
|
goto out;
|
|
if (d_really_is_negative(dchild))
|
|
goto out;
|
|
if (dchild->d_inode->i_ino != ino)
|
|
goto out;
|
|
rv = fh_compose(fhp, exp, dchild, &cd->fh);
|
|
out:
|
|
dput(dchild);
|
|
return rv;
|
|
}
|
|
|
|
static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
|
|
{
|
|
struct svc_fh *fh = &cd->scratch;
|
|
__be32 err;
|
|
|
|
fh_init(fh, NFS3_FHSIZE);
|
|
err = compose_entry_fh(cd, fh, name, namlen, ino);
|
|
if (err) {
|
|
*p++ = 0;
|
|
*p++ = 0;
|
|
goto out;
|
|
}
|
|
p = encode_post_op_attr(cd->rqstp, p, fh);
|
|
*p++ = xdr_one; /* yes, a file handle follows */
|
|
p = encode_fh(p, fh);
|
|
out:
|
|
fh_put(fh);
|
|
return p;
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
loff_t offset, u64 ino, unsigned int d_type, int plus)
|
|
{
|
|
struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
|
|
common);
|
|
__be32 *p = cd->buffer;
|
|
caddr_t curr_page_addr = NULL;
|
|
struct page ** page;
|
|
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, offset64);
|
|
}
|
|
}
|
|
|
|
/*
|
|
dprintk("encode_entry(%.*s @%ld%s)\n",
|
|
namlen, name, (long) offset, plus? " plus" : "");
|
|
*/
|
|
|
|
/* truncate filename if too long */
|
|
namlen = min(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 (page = cd->rqstp->rq_respages + 1;
|
|
page < cd->rqstp->rq_next_page; page++) {
|
|
curr_page_addr = page_address(*page);
|
|
|
|
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);
|
|
|
|
if (plus)
|
|
p = encode_entryplus_baggage(cd, p, name, namlen, ino);
|
|
num_entry_words = p - cd->buffer;
|
|
} else if (*(page+1) != NULL) {
|
|
/* temporarily encode entry into next page, then move back to
|
|
* current and next page in rq_respages[] */
|
|
__be32 *p1, *tmp;
|
|
int len1, len2;
|
|
|
|
/* grab next page for temporary storage of entry */
|
|
p1 = tmp = page_address(*(page+1));
|
|
|
|
p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
|
|
|
|
if (plus)
|
|
p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
|
|
|
|
/* 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(void *cd, const char *name,
|
|
int namlen, loff_t offset, u64 ino, unsigned int d_type)
|
|
{
|
|
return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
|
|
}
|
|
|
|
int
|
|
nfs3svc_encode_entry_plus(void *cd, const char *name,
|
|
int namlen, loff_t offset, u64 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, __be32 *p)
|
|
{
|
|
struct nfsd3_fsstatres *resp = rqstp->rq_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, __be32 *p)
|
|
{
|
|
struct nfsd3_fsinfores *resp = rqstp->rq_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, __be32 *p)
|
|
{
|
|
struct nfsd3_pathconfres *resp = rqstp->rq_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, __be32 *p)
|
|
{
|
|
struct nfsd3_commitres *resp = rqstp->rq_resp;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
p = encode_wcc_data(rqstp, p, &resp->fh);
|
|
/* Write verifier */
|
|
if (resp->status == 0) {
|
|
/* unique identifier, y2038 overflow can be ignored */
|
|
*p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
|
|
*p++ = htonl(nn->nfssvc_boot.tv_nsec);
|
|
}
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
/*
|
|
* XDR release functions
|
|
*/
|
|
void
|
|
nfs3svc_release_fhandle(struct svc_rqst *rqstp)
|
|
{
|
|
struct nfsd3_attrstat *resp = rqstp->rq_resp;
|
|
|
|
fh_put(&resp->fh);
|
|
}
|
|
|
|
void
|
|
nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
|
|
{
|
|
struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
|
|
|
|
fh_put(&resp->fh1);
|
|
fh_put(&resp->fh2);
|
|
}
|