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OpenCloudOS-Kernel/fs/nfsd/nfs3xdr.c

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// SPDX-License-Identifier: GPL-2.0
/*
* XDR support for nfsd/protocol version 3.
*
* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
*
* 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
*/
#include <linux/namei.h>
#include <linux/sunrpc/svc_xprt.h>
#include "xdr3.h"
#include "auth.h"
#include "netns.h"
#include "vfs.h"
#define NFSDDBG_FACILITY NFSDDBG_XDR
/*
* Mapping of S_IF* types to NFS file types
*/
static u32 nfs3_ftypes[] = {
NF3NON, NF3FIFO, NF3CHR, NF3BAD,
NF3DIR, NF3BAD, NF3BLK, NF3BAD,
NF3REG, NF3BAD, NF3LNK, NF3BAD,
NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
};
/*
* Basic NFSv3 data types (RFC 1813 Sections 2.5 and 2.6)
*/
static __be32 *
encode_time3(__be32 *p, struct timespec64 *time)
{
*p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
return p;
}
static bool
svcxdr_decode_nfstime3(struct xdr_stream *xdr, struct timespec64 *timep)
{
__be32 *p;
p = xdr_inline_decode(xdr, XDR_UNIT * 2);
if (!p)
return false;
timep->tv_sec = be32_to_cpup(p++);
timep->tv_nsec = be32_to_cpup(p);
return true;
}
/**
* svcxdr_decode_nfs_fh3 - Decode an NFSv3 file handle
* @xdr: XDR stream positioned at an undecoded NFSv3 FH
* @fhp: OUT: filled-in server file handle
*
* Return values:
* %false: The encoded file handle was not valid
* %true: @fhp has been initialized
*/
bool
svcxdr_decode_nfs_fh3(struct xdr_stream *xdr, struct svc_fh *fhp)
{
__be32 *p;
u32 size;
if (xdr_stream_decode_u32(xdr, &size) < 0)
return false;
if (size == 0 || size > NFS3_FHSIZE)
return false;
p = xdr_inline_decode(xdr, size);
if (!p)
return false;
fh_init(fhp, NFS3_FHSIZE);
fhp->fh_handle.fh_size = size;
memcpy(&fhp->fh_handle.fh_base, p, size);
return true;
}
static __be32 *
encode_fh(__be32 *p, struct svc_fh *fhp)
{
unsigned int size = fhp->fh_handle.fh_size;
*p++ = htonl(size);
if (size) p[XDR_QUADLEN(size)-1]=0;
memcpy(p, &fhp->fh_handle.fh_base, size);
return p + XDR_QUADLEN(size);
}
static bool
svcxdr_decode_filename3(struct xdr_stream *xdr, char **name, unsigned int *len)
{
u32 size, i;
__be32 *p;
char *c;
if (xdr_stream_decode_u32(xdr, &size) < 0)
return false;
if (size == 0 || size > NFS3_MAXNAMLEN)
return false;
p = xdr_inline_decode(xdr, size);
if (!p)
return false;
*len = size;
*name = (char *)p;
for (i = 0, c = *name; i < size; i++, c++) {
if (*c == '\0' || *c == '/')
return false;
}
return true;
}
static bool
svcxdr_decode_diropargs3(struct xdr_stream *xdr, struct svc_fh *fhp,
char **name, unsigned int *len)
{
return svcxdr_decode_nfs_fh3(xdr, fhp) &&
svcxdr_decode_filename3(xdr, name, len);
}
static bool
svcxdr_decode_sattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
struct iattr *iap)
{
u32 set_it;
iap->ia_valid = 0;
if (xdr_stream_decode_bool(xdr, &set_it) < 0)
return false;
if (set_it) {
u32 mode;
if (xdr_stream_decode_u32(xdr, &mode) < 0)
return false;
iap->ia_valid |= ATTR_MODE;
iap->ia_mode = mode;
}
if (xdr_stream_decode_bool(xdr, &set_it) < 0)
return false;
if (set_it) {
u32 uid;
if (xdr_stream_decode_u32(xdr, &uid) < 0)
return false;
iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), uid);
if (uid_valid(iap->ia_uid))
iap->ia_valid |= ATTR_UID;
}
if (xdr_stream_decode_bool(xdr, &set_it) < 0)
return false;
if (set_it) {
u32 gid;
if (xdr_stream_decode_u32(xdr, &gid) < 0)
return false;
iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), gid);
if (gid_valid(iap->ia_gid))
iap->ia_valid |= ATTR_GID;
}
if (xdr_stream_decode_bool(xdr, &set_it) < 0)
return false;
if (set_it) {
u64 newsize;
if (xdr_stream_decode_u64(xdr, &newsize) < 0)
return false;
iap->ia_valid |= ATTR_SIZE;
iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
}
if (xdr_stream_decode_u32(xdr, &set_it) < 0)
return false;
switch (set_it) {
case DONT_CHANGE:
break;
case SET_TO_SERVER_TIME:
iap->ia_valid |= ATTR_ATIME;
break;
case SET_TO_CLIENT_TIME:
if (!svcxdr_decode_nfstime3(xdr, &iap->ia_atime))
return false;
iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
break;
default:
return false;
}
if (xdr_stream_decode_u32(xdr, &set_it) < 0)
return false;
switch (set_it) {
case DONT_CHANGE:
break;
case SET_TO_SERVER_TIME:
iap->ia_valid |= ATTR_MTIME;
break;
case SET_TO_CLIENT_TIME:
if (!svcxdr_decode_nfstime3(xdr, &iap->ia_mtime))
return false;
iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
break;
default:
return false;
}
return true;
}
static bool
svcxdr_decode_sattrguard3(struct xdr_stream *xdr, struct nfsd3_sattrargs *args)
{
__be32 *p;
u32 check;
if (xdr_stream_decode_bool(xdr, &check) < 0)
return false;
if (check) {
p = xdr_inline_decode(xdr, XDR_UNIT * 2);
if (!p)
return false;
args->check_guard = 1;
args->guardtime = be32_to_cpup(p);
} else
args->check_guard = 0;
return true;
}
static bool
svcxdr_decode_specdata3(struct xdr_stream *xdr, struct nfsd3_mknodargs *args)
{
__be32 *p;
p = xdr_inline_decode(xdr, XDR_UNIT * 2);
if (!p)
return false;
args->major = be32_to_cpup(p++);
args->minor = be32_to_cpup(p);
return true;
}
static bool
svcxdr_decode_devicedata3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
struct nfsd3_mknodargs *args)
{
return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) &&
svcxdr_decode_specdata3(xdr, args);
}
static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
{
u64 f;
switch(fsid_source(fhp)) {
default:
case FSIDSOURCE_DEV:
p = xdr_encode_hyper(p, (u64)huge_encode_dev
(fhp->fh_dentry->d_sb->s_dev));
break;
case FSIDSOURCE_FSID:
p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
break;
case FSIDSOURCE_UUID:
f = ((u64*)fhp->fh_export->ex_uuid)[0];
f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
p = xdr_encode_hyper(p, f);
break;
}
return p;
}
static __be32 *
encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
struct kstat *stat)
{
struct user_namespace *userns = nfsd_user_namespace(rqstp);
*p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
*p++ = htonl((u32) (stat->mode & S_IALLUGO));
*p++ = htonl((u32) stat->nlink);
*p++ = htonl((u32) from_kuid_munged(userns, stat->uid));
*p++ = htonl((u32) from_kgid_munged(userns, stat->gid));
if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
} else {
p = xdr_encode_hyper(p, (u64) stat->size);
}
p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
*p++ = htonl((u32) MAJOR(stat->rdev));
*p++ = htonl((u32) MINOR(stat->rdev));
p = encode_fsid(p, fhp);
p = xdr_encode_hyper(p, stat->ino);
p = encode_time3(p, &stat->atime);
p = encode_time3(p, &stat->mtime);
p = encode_time3(p, &stat->ctime);
return p;
}
static __be32 *
encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
/* Attributes to follow */
*p++ = xdr_one;
return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
}
/*
* Encode post-operation attributes.
* The inode may be NULL if the call failed because of a stale file
* handle. In this case, no attributes are returned.
*/
static __be32 *
encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
struct dentry *dentry = fhp->fh_dentry;
if (!fhp->fh_no_wcc && dentry && d_really_is_positive(dentry)) {
__be32 err;
struct kstat stat;
err = fh_getattr(fhp, &stat);
if (!err) {
*p++ = xdr_one; /* attributes follow */
lease_get_mtime(d_inode(dentry), &stat.mtime);
return encode_fattr3(rqstp, p, fhp, &stat);
}
}
*p++ = xdr_zero;
return p;
}
/* Helper for NFSv3 ACLs */
__be32 *
nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
return encode_post_op_attr(rqstp, p, fhp);
}
/*
* Enocde weak cache consistency data
*/
static __be32 *
encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
struct dentry *dentry = fhp->fh_dentry;
if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
if (fhp->fh_pre_saved) {
*p++ = xdr_one;
p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
p = encode_time3(p, &fhp->fh_pre_mtime);
p = encode_time3(p, &fhp->fh_pre_ctime);
} else {
*p++ = xdr_zero;
}
return encode_saved_post_attr(rqstp, p, fhp);
}
/* no pre- or post-attrs */
*p++ = xdr_zero;
return encode_post_op_attr(rqstp, p, fhp);
}
static bool fs_supports_change_attribute(struct super_block *sb)
{
return sb->s_flags & SB_I_VERSION || sb->s_export_op->fetch_iversion;
}
/*
* Fill in the pre_op attr for the wcc data
*/
void fill_pre_wcc(struct svc_fh *fhp)
{
struct inode *inode;
struct kstat stat;
bool v4 = (fhp->fh_maxsize == NFS4_FHSIZE);
if (fhp->fh_no_wcc || fhp->fh_pre_saved)
return;
inode = d_inode(fhp->fh_dentry);
if (fs_supports_change_attribute(inode->i_sb) || !v4) {
__be32 err = fh_getattr(fhp, &stat);
if (err) {
/* Grab the times from inode anyway */
stat.mtime = inode->i_mtime;
stat.ctime = inode->i_ctime;
stat.size = inode->i_size;
}
fhp->fh_pre_mtime = stat.mtime;
fhp->fh_pre_ctime = stat.ctime;
fhp->fh_pre_size = stat.size;
}
if (v4)
fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
fhp->fh_pre_saved = true;
}
/*
* Fill in the post_op attr for the wcc data
*/
void fill_post_wcc(struct svc_fh *fhp)
{
bool v4 = (fhp->fh_maxsize == NFS4_FHSIZE);
struct inode *inode = d_inode(fhp->fh_dentry);
if (fhp->fh_no_wcc)
return;
if (fhp->fh_post_saved)
printk("nfsd: inode locked twice during operation.\n");
fhp->fh_post_saved = true;
if (fs_supports_change_attribute(inode->i_sb) || !v4) {
__be32 err = fh_getattr(fhp, &fhp->fh_post_attr);
if (err) {
fhp->fh_post_saved = false;
fhp->fh_post_attr.ctime = inode->i_ctime;
}
}
if (v4)
fhp->fh_post_change =
nfsd4_change_attribute(&fhp->fh_post_attr, inode);
}
/*
* XDR decode functions
*/
int
nfs3svc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd_fhandle *args = rqstp->rq_argp;
return svcxdr_decode_nfs_fh3(xdr, &args->fh);
}
int
nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_sattrargs *args = rqstp->rq_argp;
return svcxdr_decode_nfs_fh3(xdr, &args->fh) &&
svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) &&
svcxdr_decode_sattrguard3(xdr, args);
}
int
nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_diropargs *args = rqstp->rq_argp;
return svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len);
}
int
nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_accessargs *args = rqstp->rq_argp;
if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
return 0;
if (xdr_stream_decode_u32(xdr, &args->access) < 0)
return 0;
return 1;
}
int
nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_readargs *args = rqstp->rq_argp;
if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
return 0;
if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
return 0;
if (xdr_stream_decode_u32(xdr, &args->count) < 0)
return 0;
return 1;
}
int
nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_writeargs *args = rqstp->rq_argp;
u32 max_blocksize = svc_max_payload(rqstp);
struct kvec *head = rqstp->rq_arg.head;
struct kvec *tail = rqstp->rq_arg.tail;
size_t remaining;
if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
return 0;
if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
return 0;
if (xdr_stream_decode_u32(xdr, &args->count) < 0)
return 0;
if (xdr_stream_decode_u32(xdr, &args->stable) < 0)
return 0;
/* opaque data */
if (xdr_stream_decode_u32(xdr, &args->len) < 0)
return 0;
/* request sanity */
if (args->count != args->len)
return 0;
remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
remaining -= xdr_stream_pos(xdr);
if (remaining < xdr_align_size(args->len))
return 0;
if (args->count > max_blocksize) {
args->count = max_blocksize;
args->len = max_blocksize;
}
args->first.iov_base = xdr->p;
args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
return 1;
}
int
nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_createargs *args = rqstp->rq_argp;
if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
return 0;
if (xdr_stream_decode_u32(xdr, &args->createmode) < 0)
return 0;
switch (args->createmode) {
case NFS3_CREATE_UNCHECKED:
case NFS3_CREATE_GUARDED:
return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
case NFS3_CREATE_EXCLUSIVE:
args->verf = xdr_inline_decode(xdr, NFS3_CREATEVERFSIZE);
if (!args->verf)
return 0;
break;
default:
return 0;
}
return 1;
}
int
nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_createargs *args = rqstp->rq_argp;
return svcxdr_decode_diropargs3(xdr, &args->fh,
&args->name, &args->len) &&
svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
}
int
nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_symlinkargs *args = rqstp->rq_argp;
struct kvec *head = rqstp->rq_arg.head;
struct kvec *tail = rqstp->rq_arg.tail;
size_t remaining;
if (!svcxdr_decode_diropargs3(xdr, &args->ffh, &args->fname, &args->flen))
return 0;
if (!svcxdr_decode_sattr3(rqstp, xdr, &args->attrs))
return 0;
if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
return 0;
/* request sanity */
remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
remaining -= xdr_stream_pos(xdr);
if (remaining < xdr_align_size(args->tlen))
return 0;
args->first.iov_base = xdr->p;
args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
return 1;
}
int
nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_mknodargs *args = rqstp->rq_argp;
if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
return 0;
if (xdr_stream_decode_u32(xdr, &args->ftype) < 0)
return 0;
switch (args->ftype) {
case NF3CHR:
case NF3BLK:
return svcxdr_decode_devicedata3(rqstp, xdr, args);
case NF3SOCK:
case NF3FIFO:
return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
case NF3REG:
case NF3DIR:
case NF3LNK:
/* Valid XDR but illegal file types */
break;
default:
return 0;
}
return 1;
}
int
nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_renameargs *args = rqstp->rq_argp;
return svcxdr_decode_diropargs3(xdr, &args->ffh,
&args->fname, &args->flen) &&
svcxdr_decode_diropargs3(xdr, &args->tfh,
&args->tname, &args->tlen);
}
int
nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_linkargs *args = rqstp->rq_argp;
return svcxdr_decode_nfs_fh3(xdr, &args->ffh) &&
svcxdr_decode_diropargs3(xdr, &args->tfh,
&args->tname, &args->tlen);
}
int
nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_readdirargs *args = rqstp->rq_argp;
if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
return 0;
if (xdr_stream_decode_u64(xdr, &args->cookie) < 0)
return 0;
args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
if (!args->verf)
return 0;
if (xdr_stream_decode_u32(xdr, &args->count) < 0)
return 0;
return 1;
}
int
nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_readdirargs *args = rqstp->rq_argp;
u32 dircount;
if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
return 0;
if (xdr_stream_decode_u64(xdr, &args->cookie) < 0)
return 0;
args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
if (!args->verf)
return 0;
/* dircount is ignored */
if (xdr_stream_decode_u32(xdr, &dircount) < 0)
return 0;
if (xdr_stream_decode_u32(xdr, &args->count) < 0)
return 0;
return 1;
}
int
nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_commitargs *args = rqstp->rq_argp;
if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
return 0;
if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
return 0;
if (xdr_stream_decode_u32(xdr, &args->count) < 0)
return 0;
return 1;
}
/*
* XDR encode functions
*/
/* GETATTR */
int
nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
{
struct nfsd3_attrstat *resp = rqstp->rq_resp;
*p++ = resp->status;
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++ = resp->status;
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;
*p++ = resp->status;
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++ = resp->status;
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;
struct kvec *head = rqstp->rq_res.head;
*p++ = resp->status;
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);
}
if (svc_encode_result_payload(rqstp, head->iov_len, resp->len))
return 0;
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;
struct kvec *head = rqstp->rq_res.head;
*p++ = resp->status;
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);
}
if (svc_encode_result_payload(rqstp, head->iov_len,
resp->count))
return 0;
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;
*p++ = resp->status;
p = encode_wcc_data(rqstp, p, &resp->fh);
if (resp->status == 0) {
*p++ = htonl(resp->count);
*p++ = htonl(resp->committed);
*p++ = resp->verf[0];
*p++ = resp->verf[1];
}
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;
*p++ = resp->status;
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++ = resp->status;
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++ = resp->status;
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++ = resp->status;
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);
/*
* Don't return filehandle for ".." if we're at
* the filesystem or export root:
*/
if (dchild == dparent)
goto out;
if (dparent == exp->ex_path.dentry)
goto out;
} else
dchild = dget(dparent);
} else
dchild = lookup_positive_unlocked(name, dparent, namlen);
if (IS_ERR(dchild))
return rv;
if (d_mountpoint(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);
}
cd->offset = NULL;
}
/*
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++ = resp->status;
*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++ = resp->status;
*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++ = resp->status;
*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;
*p++ = resp->status;
p = encode_wcc_data(rqstp, p, &resp->fh);
/* Write verifier */
if (resp->status == 0) {
*p++ = resp->verf[0];
*p++ = resp->verf[1];
}
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);
}
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