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OpenCloudOS-Kernel/fs/nfsd/nfsxdr.c

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/*
* linux/fs/nfsd/nfsxdr.c
*
* XDR support for nfsd
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/types.h>
#include <linux/time.h>
#include <linux/nfs.h>
#include <linux/vfs.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/xdr.h>
#include <linux/mm.h>
#define NFSDDBG_FACILITY NFSDDBG_XDR
/*
* Mapping of S_IF* types to NFS file types
*/
static u32 nfs_ftypes[] = {
NFNON, NFCHR, NFCHR, NFBAD,
NFDIR, NFBAD, NFBLK, NFBAD,
NFREG, NFBAD, NFLNK, NFBAD,
NFSOCK, NFBAD, NFLNK, NFBAD,
};
/*
* XDR functions for basic NFS types
*/
static __be32 *
decode_fh(__be32 *p, struct svc_fh *fhp)
{
fh_init(fhp, NFS_FHSIZE);
memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
fhp->fh_handle.fh_size = NFS_FHSIZE;
/* FIXME: Look up export pointer here and verify
* Sun Secure RPC if requested */
return p + (NFS_FHSIZE >> 2);
}
/* Helper function for NFSv2 ACL code */
__be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
{
return decode_fh(p, fhp);
}
static __be32 *
encode_fh(__be32 *p, struct svc_fh *fhp)
{
memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
return p + (NFS_FHSIZE>> 2);
}
/*
* Decode a file name and make sure that the path contains
* no slashes or null bytes.
*/
static __be32 *
decode_filename(__be32 *p, char **namp, int *lenp)
{
char *name;
int i;
if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
for (i = 0, name = *namp; i < *lenp; i++, name++) {
if (*name == '\0' || *name == '/')
return NULL;
}
}
return p;
}
static __be32 *
decode_pathname(__be32 *p, char **namp, int *lenp)
{
char *name;
int i;
if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
for (i = 0, name = *namp; i < *lenp; i++, name++) {
if (*name == '\0')
return NULL;
}
}
return p;
}
static __be32 *
decode_sattr(__be32 *p, struct iattr *iap)
{
u32 tmp, tmp1;
iap->ia_valid = 0;
/* Sun client bug compatibility check: some sun clients seem to
* put 0xffff in the mode field when they mean 0xffffffff.
* Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
*/
if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
iap->ia_valid |= ATTR_MODE;
iap->ia_mode = tmp;
}
if ((tmp = ntohl(*p++)) != (u32)-1) {
iap->ia_valid |= ATTR_UID;
iap->ia_uid = tmp;
}
if ((tmp = ntohl(*p++)) != (u32)-1) {
iap->ia_valid |= ATTR_GID;
iap->ia_gid = tmp;
}
if ((tmp = ntohl(*p++)) != (u32)-1) {
iap->ia_valid |= ATTR_SIZE;
iap->ia_size = tmp;
}
tmp = ntohl(*p++); tmp1 = ntohl(*p++);
if (tmp != (u32)-1 && tmp1 != (u32)-1) {
iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
iap->ia_atime.tv_sec = tmp;
iap->ia_atime.tv_nsec = tmp1 * 1000;
}
tmp = ntohl(*p++); tmp1 = ntohl(*p++);
if (tmp != (u32)-1 && tmp1 != (u32)-1) {
iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
iap->ia_mtime.tv_sec = tmp;
iap->ia_mtime.tv_nsec = tmp1 * 1000;
/*
* Passing the invalid value useconds=1000000 for mtime
* is a Sun convention for "set both mtime and atime to
* current server time". It's needed to make permissions
* checks for the "touch" program across v2 mounts to
* Solaris and Irix boxes work correctly. See description of
* sattr in section 6.1 of "NFS Illustrated" by
* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
*/
if (tmp1 == 1000000)
iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
}
return p;
}
static __be32 *
encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
struct kstat *stat)
{
struct dentry *dentry = fhp->fh_dentry;
int type;
struct timespec time;
type = (stat->mode & S_IFMT);
*p++ = htonl(nfs_ftypes[type >> 12]);
*p++ = htonl((u32) stat->mode);
*p++ = htonl((u32) stat->nlink);
*p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
*p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
*p++ = htonl(NFS_MAXPATHLEN);
} else {
*p++ = htonl((u32) stat->size);
}
*p++ = htonl((u32) stat->blksize);
if (S_ISCHR(type) || S_ISBLK(type))
*p++ = htonl(new_encode_dev(stat->rdev));
else
*p++ = htonl(0xffffffff);
*p++ = htonl((u32) stat->blocks);
if (is_fsid(fhp, rqstp->rq_reffh))
*p++ = htonl((u32) fhp->fh_export->ex_fsid);
else
*p++ = htonl(new_encode_dev(stat->dev));
*p++ = htonl((u32) stat->ino);
*p++ = htonl((u32) stat->atime.tv_sec);
*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
lease_get_mtime(dentry->d_inode, &time);
*p++ = htonl((u32) time.tv_sec);
*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
*p++ = htonl((u32) stat->ctime.tv_sec);
*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
return p;
}
/* Helper function for NFSv2 ACL code */
__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
struct kstat stat;
vfs_getattr(fhp->fh_export->ex_mnt, fhp->fh_dentry, &stat);
return encode_fattr(rqstp, p, fhp, &stat);
}
/*
* XDR decode functions
*/
int
nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
{
if (!(p = decode_fh(p, &args->fh)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_sattrargs *args)
{
if (!(p = decode_fh(p, &args->fh))
|| !(p = decode_sattr(p, &args->attrs)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_diropargs *args)
{
if (!(p = decode_fh(p, &args->fh))
|| !(p = decode_filename(p, &args->name, &args->len)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_readargs *args)
{
unsigned int len;
int v,pn;
if (!(p = decode_fh(p, &args->fh)))
return 0;
args->offset = ntohl(*p++);
len = args->count = ntohl(*p++);
p++; /* totalcount - unused */
if (len > NFSSVC_MAXBLKSIZE_V2)
len = NFSSVC_MAXBLKSIZE_V2;
/* set up somewhere to store response.
* We take pages, put them on reslist and include in iovec
*/
v=0;
while (len > 0) {
pn = rqstp->rq_resused++;
rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
len -= rqstp->rq_vec[v].iov_len;
v++;
}
args->vlen = v;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_writeargs *args)
{
unsigned int len;
int v;
if (!(p = decode_fh(p, &args->fh)))
return 0;
p++; /* beginoffset */
args->offset = ntohl(*p++); /* offset */
p++; /* totalcount */
len = args->len = ntohl(*p++);
rqstp->rq_vec[0].iov_base = (void*)p;
rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len -
(((void*)p) - rqstp->rq_arg.head[0].iov_base);
if (len > NFSSVC_MAXBLKSIZE_V2)
len = NFSSVC_MAXBLKSIZE_V2;
v = 0;
while (len > rqstp->rq_vec[v].iov_len) {
len -= rqstp->rq_vec[v].iov_len;
v++;
rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
rqstp->rq_vec[v].iov_len = PAGE_SIZE;
}
rqstp->rq_vec[v].iov_len = len;
args->vlen = v+1;
return rqstp->rq_vec[0].iov_len > 0;
}
int
nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_createargs *args)
{
if (!(p = decode_fh(p, &args->fh))
|| !(p = decode_filename(p, &args->name, &args->len))
|| !(p = decode_sattr(p, &args->attrs)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_renameargs *args)
{
if (!(p = decode_fh(p, &args->ffh))
|| !(p = decode_filename(p, &args->fname, &args->flen))
|| !(p = decode_fh(p, &args->tfh))
|| !(p = decode_filename(p, &args->tname, &args->tlen)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
{
if (!(p = decode_fh(p, &args->fh)))
return 0;
args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_linkargs *args)
{
if (!(p = decode_fh(p, &args->ffh))
|| !(p = decode_fh(p, &args->tfh))
|| !(p = decode_filename(p, &args->tname, &args->tlen)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_symlinkargs *args)
{
if (!(p = decode_fh(p, &args->ffh))
|| !(p = decode_filename(p, &args->fname, &args->flen))
|| !(p = decode_pathname(p, &args->tname, &args->tlen))
|| !(p = decode_sattr(p, &args->attrs)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_readdirargs *args)
{
if (!(p = decode_fh(p, &args->fh)))
return 0;
args->cookie = ntohl(*p++);
args->count = ntohl(*p++);
if (args->count > PAGE_SIZE)
args->count = PAGE_SIZE;
args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
return xdr_argsize_check(rqstp, p);
}
/*
* XDR encode functions
*/
int
nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_attrstat *resp)
{
p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_diropres *resp)
{
p = encode_fh(p, &resp->fh);
p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_readlinkres *resp)
{
*p++ = htonl(resp->len);
xdr_ressize_check(rqstp, p);
rqstp->rq_res.page_len = resp->len;
if (resp->len & 3) {
/* need to pad the tail */
rqstp->rq_res.tail[0].iov_base = p;
*p = 0;
rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
}
return 1;
}
int
nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_readres *resp)
{
p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
*p++ = htonl(resp->count);
xdr_ressize_check(rqstp, p);
/* now update rqstp->rq_res to reflect data aswell */
rqstp->rq_res.page_len = resp->count;
if (resp->count & 3) {
/* need to pad the tail */
rqstp->rq_res.tail[0].iov_base = p;
*p = 0;
rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
}
return 1;
}
int
nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_readdirres *resp)
{
xdr_ressize_check(rqstp, p);
p = resp->buffer;
*p++ = 0; /* no more entries */
*p++ = htonl((resp->common.err == nfserr_eof));
rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
return 1;
}
int
nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_statfsres *resp)
{
struct kstatfs *stat = &resp->stats;
*p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
*p++ = htonl(stat->f_bsize);
*p++ = htonl(stat->f_blocks);
*p++ = htonl(stat->f_bfree);
*p++ = htonl(stat->f_bavail);
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_entry(struct readdir_cd *ccd, const char *name,
int namlen, loff_t offset, ino_t ino, unsigned int d_type)
{
struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
__be32 *p = cd->buffer;
int buflen, slen;
/*
dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
namlen, name, offset, ino);
*/
if (offset > ~((u32) 0)) {
cd->common.err = nfserr_fbig;
return -EINVAL;
}
if (cd->offset)
*cd->offset = htonl(offset);
if (namlen > NFS2_MAXNAMLEN)
namlen = NFS2_MAXNAMLEN;/* truncate filename */
slen = XDR_QUADLEN(namlen);
if ((buflen = cd->buflen - slen - 4) < 0) {
cd->common.err = nfserr_toosmall;
return -EINVAL;
}
*p++ = xdr_one; /* mark entry present */
*p++ = htonl((u32) ino); /* file id */
p = xdr_encode_array(p, name, namlen);/* name length & name */
cd->offset = p; /* remember pointer */
*p++ = htonl(~0U); /* offset of next entry */
cd->buflen = buflen;
cd->buffer = p;
cd->common.err = nfs_ok;
return 0;
}
/*
* XDR release functions
*/
int
nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_fhandle *resp)
{
fh_put(&resp->fh);
return 1;
}
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