linux/fs/nfsd/nfsxdr.c
Benoit Taine d40aa3372f nfsd: Remove assignments inside conditions
Assignments should not happen inside an if conditional, but in the line
before. This issue was reported by checkpatch.

The semantic patch that makes this change is as follows
(http://coccinelle.lip6.fr/):

// <smpl>

@@
identifier i1;
expression e1;
statement S;
@@
-if(!(i1 = e1)) S
+i1 = e1;
+if(!i1)
+S

// </smpl>

It has been tested by compilation.

Signed-off-by: Benoit Taine <benoit.taine@lip6.fr>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2014-05-22 15:52:23 -04:00

553 lines
13 KiB
C

/*
* XDR support for nfsd
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include "vfs.h"
#include "xdr.h"
#include "auth.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, unsigned int *lenp)
{
char *name;
unsigned 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, unsigned int *lenp)
{
char *name;
unsigned 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_uid = make_kuid(&init_user_ns, tmp);
if (uid_valid(iap->ia_uid))
iap->ia_valid |= ATTR_UID;
}
if ((tmp = ntohl(*p++)) != (u32)-1) {
iap->ia_gid = make_kgid(&init_user_ns, tmp);
if (gid_valid(iap->ia_gid))
iap->ia_valid |= ATTR_GID;
}
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;
u32 f;
type = (stat->mode & S_IFMT);
*p++ = htonl(nfs_ftypes[type >> 12]);
*p++ = htonl((u32) stat->mode);
*p++ = htonl((u32) stat->nlink);
*p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
*p++ = htonl((u32) from_kgid(&init_user_ns, 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);
switch (fsid_source(fhp)) {
default:
case FSIDSOURCE_DEV:
*p++ = htonl(new_encode_dev(stat->dev));
break;
case FSIDSOURCE_FSID:
*p++ = htonl((u32) fhp->fh_export->ex_fsid);
break;
case FSIDSOURCE_UUID:
f = ((u32*)fhp->fh_export->ex_uuid)[0];
f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
*p++ = htonl(f);
break;
}
*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)
{
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)
{
p = decode_fh(p, &args->fh);
if (!p)
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_sattrargs *args)
{
p = decode_fh(p, &args->fh);
if (!p)
return 0;
p = decode_sattr(p, &args->attrs);
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;
p = decode_fh(p, &args->fh);
if (!p)
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) {
struct page *p = *(rqstp->rq_next_page++);
rqstp->rq_vec[v].iov_base = page_address(p);
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, hdr, dlen;
int v;
p = decode_fh(p, &args->fh);
if (!p)
return 0;
p++; /* beginoffset */
args->offset = ntohl(*p++); /* offset */
p++; /* totalcount */
len = args->len = ntohl(*p++);
/*
* The protocol specifies a maximum of 8192 bytes.
*/
if (len > NFSSVC_MAXBLKSIZE_V2)
return 0;
/*
* Check to make sure that we got the right number of
* bytes.
*/
hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
- hdr;
/*
* Round the length of the data which was specified up to
* the next multiple of XDR units and then compare that
* against the length which was actually received.
* Note that when RPCSEC/GSS (for example) is used, the
* data buffer can be padded so dlen might be larger
* than required. It must never be smaller.
*/
if (dlen < XDR_QUADLEN(len)*4)
return 0;
rqstp->rq_vec[0].iov_base = (void*)p;
rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
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 1;
}
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)))
return 0;
p = decode_sattr(p, &args->attrs);
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)
{
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
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)))
return 0;
p = decode_sattr(p, &args->attrs);
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_readdirargs *args)
{
p = decode_fh(p, &args->fh);
if (!p)
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_next_page++));
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 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;
}
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(void *ccdv, const char *name,
int namlen, loff_t offset, u64 ino, unsigned int d_type)
{
struct readdir_cd *ccd = ccdv;
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;
}
if (ino > ~((u32) 0)) {
cd->common.err = nfserr_fbig;
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;
}