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android_kernel_motorola_sm6225/fs/nfsd/nfs3xdr.c
Andreas Gruenbacher a257cdd0e2 [PATCH] NFSD: Add server support for NFSv3 ACLs. 
This adds functions for encoding and decoding POSIX ACLs for the NFSACL
 protocol extension, and the GETACL and SETACL RPCs.  The implementation is
 compatible with NFSACL in Solaris.

 Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
 Acked-by: Olaf Kirch <okir@suse.de>
 Signed-off-by: Andrew Morton <akpm@osdl.org>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2005-06-22 16:07:23 -04:00

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/*
* linux/fs/nfsd/nfs3xdr.c
*
* 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/types.h>
#include <linux/time.h>
#include <linux/nfs3.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/mm.h>
#include <linux/vfs.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/xdr3.h>
#define NFSDDBG_FACILITY NFSDDBG_XDR
#ifdef NFSD_OPTIMIZE_SPACE
# define inline
#endif
/*
* 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,
};
/*
* XDR functions for basic NFS types
*/
static inline u32 *
encode_time3(u32 *p, struct timespec *time)
{
*p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
return p;
}
static inline u32 *
decode_time3(u32 *p, struct timespec *time)
{
time->tv_sec = ntohl(*p++);
time->tv_nsec = ntohl(*p++);
return p;
}
static inline u32 *
decode_fh(u32 *p, struct svc_fh *fhp)
{
unsigned int size;
fh_init(fhp, NFS3_FHSIZE);
size = ntohl(*p++);
if (size > NFS3_FHSIZE)
return NULL;
memcpy(&fhp->fh_handle.fh_base, p, size);
fhp->fh_handle.fh_size = size;
return p + XDR_QUADLEN(size);
}
/* Helper function for NFSv3 ACL code */
u32 *nfs3svc_decode_fh(u32 *p, struct svc_fh *fhp)
{
return decode_fh(p, fhp);
}
static inline u32 *
encode_fh(u32 *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);
}
/*
* Decode a file name and make sure that the path contains
* no slashes or null bytes.
*/
static inline u32 *
decode_filename(u32 *p, char **namp, int *lenp)
{
char *name;
int i;
if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
for (i = 0, name = *namp; i < *lenp; i++, name++) {
if (*name == '\0' || *name == '/')
return NULL;
}
}
return p;
}
static inline u32 *
decode_sattr3(u32 *p, struct iattr *iap)
{
u32 tmp;
iap->ia_valid = 0;
if (*p++) {
iap->ia_valid |= ATTR_MODE;
iap->ia_mode = ntohl(*p++);
}
if (*p++) {
iap->ia_valid |= ATTR_UID;
iap->ia_uid = ntohl(*p++);
}
if (*p++) {
iap->ia_valid |= ATTR_GID;
iap->ia_gid = ntohl(*p++);
}
if (*p++) {
u64 newsize;
iap->ia_valid |= ATTR_SIZE;
p = xdr_decode_hyper(p, &newsize);
if (newsize <= NFS_OFFSET_MAX)
iap->ia_size = newsize;
else
iap->ia_size = NFS_OFFSET_MAX;
}
if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
iap->ia_valid |= ATTR_ATIME;
} else if (tmp == 2) { /* set to client time */
iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
iap->ia_atime.tv_sec = ntohl(*p++);
iap->ia_atime.tv_nsec = ntohl(*p++);
}
if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
iap->ia_valid |= ATTR_MTIME;
} else if (tmp == 2) { /* set to client time */
iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
iap->ia_mtime.tv_sec = ntohl(*p++);
iap->ia_mtime.tv_nsec = ntohl(*p++);
}
return p;
}
static inline u32 *
encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
struct vfsmount *mnt = fhp->fh_export->ex_mnt;
struct dentry *dentry = fhp->fh_dentry;
struct kstat stat;
struct timespec time;
vfs_getattr(mnt, dentry, &stat);
*p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 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(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));
if (is_fsid(fhp, rqstp->rq_reffh))
p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
else
p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat.dev));
p = xdr_encode_hyper(p, (u64) stat.ino);
p = encode_time3(p, &stat.atime);
lease_get_mtime(dentry->d_inode, &time);
p = encode_time3(p, &time);
p = encode_time3(p, &stat.ctime);
return p;
}
static inline u32 *
encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
struct inode *inode = fhp->fh_dentry->d_inode;
/* Attributes to follow */
*p++ = xdr_one;
*p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]);
*p++ = htonl((u32) fhp->fh_post_mode);
*p++ = htonl((u32) fhp->fh_post_nlink);
*p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid));
*p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid));
if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) {
p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
} else {
p = xdr_encode_hyper(p, (u64) fhp->fh_post_size);
}
p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9);
*p++ = fhp->fh_post_rdev[0];
*p++ = fhp->fh_post_rdev[1];
if (is_fsid(fhp, rqstp->rq_reffh))
p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
else
p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev));
p = xdr_encode_hyper(p, (u64) inode->i_ino);
p = encode_time3(p, &fhp->fh_post_atime);
p = encode_time3(p, &fhp->fh_post_mtime);
p = encode_time3(p, &fhp->fh_post_ctime);
return p;
}
/*
* 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 u32 *
encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
struct dentry *dentry = fhp->fh_dentry;
if (dentry && dentry->d_inode != NULL) {
*p++ = xdr_one; /* attributes follow */
return encode_fattr3(rqstp, p, fhp);
}
*p++ = xdr_zero;
return p;
}
/* Helper for NFSv3 ACLs */
u32 *
nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
return encode_post_op_attr(rqstp, p, fhp);
}
/*
* Enocde weak cache consistency data
*/
static u32 *
encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
struct dentry *dentry = fhp->fh_dentry;
if (dentry && dentry->d_inode && 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);
}
/*
* XDR decode functions
*/
int
nfs3svc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args)
{
if (!(p = decode_fh(p, &args->fh)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_sattrargs *args)
{
if (!(p = decode_fh(p, &args->fh))
|| !(p = decode_sattr3(p, &args->attrs)))
return 0;
if ((args->check_guard = ntohl(*p++)) != 0) {
struct timespec time;
p = decode_time3(p, &time);
args->guardtime = time.tv_sec;
}
return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_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
nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_accessargs *args)
{
if (!(p = decode_fh(p, &args->fh)))
return 0;
args->access = ntohl(*p++);
return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_readargs *args)
{
unsigned int len;
int v,pn;
if (!(p = decode_fh(p, &args->fh))
|| !(p = xdr_decode_hyper(p, &args->offset)))
return 0;
len = args->count = ntohl(*p++);
if (len > NFSSVC_MAXBLKSIZE)
len = NFSSVC_MAXBLKSIZE;
/* set up the kvec */
v=0;
while (len > 0) {
pn = rqstp->rq_resused;
svc_take_page(rqstp);
args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
args->vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
len -= args->vec[v].iov_len;
v++;
}
args->vlen = v;
return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_writeargs *args)
{
unsigned int len, v, hdr;
if (!(p = decode_fh(p, &args->fh))
|| !(p = xdr_decode_hyper(p, &args->offset)))
return 0;
args->count = ntohl(*p++);
args->stable = ntohl(*p++);
len = args->len = ntohl(*p++);
hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
if (rqstp->rq_arg.len < len + hdr)
return 0;
args->vec[0].iov_base = (void*)p;
args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
if (len > NFSSVC_MAXBLKSIZE)
len = NFSSVC_MAXBLKSIZE;
v= 0;
while (len > args->vec[v].iov_len) {
len -= args->vec[v].iov_len;
v++;
args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
args->vec[v].iov_len = PAGE_SIZE;
}
args->vec[v].iov_len = len;
args->vlen = v+1;
return args->count == args->len && args->vec[0].iov_len > 0;
}
int
nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_createargs *args)
{
if (!(p = decode_fh(p, &args->fh))
|| !(p = decode_filename(p, &args->name, &args->len)))
return 0;
switch (args->createmode = ntohl(*p++)) {
case NFS3_CREATE_UNCHECKED:
case NFS3_CREATE_GUARDED:
if (!(p = decode_sattr3(p, &args->attrs)))
return 0;
break;
case NFS3_CREATE_EXCLUSIVE:
args->verf = p;
p += 2;
break;
default:
return 0;
}
return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_createargs *args)
{
if (!(p = decode_fh(p, &args->fh))
|| !(p = decode_filename(p, &args->name, &args->len))
|| !(p = decode_sattr3(p, &args->attrs)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_symlinkargs *args)
{
unsigned int len;
int avail;
char *old, *new;
struct kvec *vec;
if (!(p = decode_fh(p, &args->ffh))
|| !(p = decode_filename(p, &args->fname, &args->flen))
|| !(p = decode_sattr3(p, &args->attrs))
)
return 0;
/* now decode the pathname, which might be larger than the first page.
* As we have to check for nul's anyway, we copy it into a new page
* This page appears in the rq_res.pages list, but as pages_len is always
* 0, it won't get in the way
*/
svc_take_page(rqstp);
len = ntohl(*p++);
if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
return 0;
args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
args->tlen = len;
/* first copy and check from the first page */
old = (char*)p;
vec = &rqstp->rq_arg.head[0];
avail = vec->iov_len - (old - (char*)vec->iov_base);
while (len && avail && *old) {
*new++ = *old++;
len--;
avail--;
}
/* now copy next page if there is one */
if (len && !avail && rqstp->rq_arg.page_len) {
avail = rqstp->rq_arg.page_len;
if (avail > PAGE_SIZE) avail = PAGE_SIZE;
old = page_address(rqstp->rq_arg.pages[0]);
}
while (len && avail && *old) {
*new++ = *old++;
len--;
avail--;
}
*new = '\0';
if (len)
return 0;
return 1;
}
int
nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_mknodargs *args)
{
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) {
if (!(p = decode_sattr3(p, &args->attrs)))
return 0;
}
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, u32 *p,
struct nfsd3_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
nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_readlinkargs *args)
{
if (!(p = decode_fh(p, &args->fh)))
return 0;
svc_take_page(rqstp);
args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_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
nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_readdirargs *args)
{
if (!(p = decode_fh(p, &args->fh)))
return 0;
p = xdr_decode_hyper(p, &args->cookie);
args->verf = p; p += 2;
args->dircount = ~0;
args->count = ntohl(*p++);
if (args->count > PAGE_SIZE)
args->count = PAGE_SIZE;
svc_take_page(rqstp);
args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_readdirargs *args)
{
int len, pn;
if (!(p = decode_fh(p, &args->fh)))
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 > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE :
args->count;
args->count = len;
while (len > 0) {
pn = rqstp->rq_resused;
svc_take_page(rqstp);
if (!args->buffer)
args->buffer = page_address(rqstp->rq_respages[pn]);
len -= PAGE_SIZE;
}
return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_commitargs *args)
{
if (!(p = decode_fh(p, &args->fh)))
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, u32 *p, void *dummy)
{
return xdr_ressize_check(rqstp, p);
}
/* GETATTR */
int
nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_attrstat *resp)
{
if (resp->status == 0)
p = encode_fattr3(rqstp, p, &resp->fh);
return xdr_ressize_check(rqstp, p);
}
/* SETATTR, REMOVE, RMDIR */
int
nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_attrstat *resp)
{
p = encode_wcc_data(rqstp, p, &resp->fh);
return xdr_ressize_check(rqstp, p);
}
/* LOOKUP */
int
nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_diropres *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, u32 *p,
struct nfsd3_accessres *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, u32 *p,
struct nfsd3_readlinkres *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_restailpage = 0;
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, u32 *p,
struct nfsd3_readres *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 aswell */
rqstp->rq_res.page_len = resp->count;
if (resp->count & 3) {
/* need to pad the tail */
rqstp->rq_restailpage = 0;
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, u32 *p,
struct nfsd3_writeres *resp)
{
p = encode_wcc_data(rqstp, p, &resp->fh);
if (resp->status == 0) {
*p++ = htonl(resp->count);
*p++ = htonl(resp->committed);
*p++ = htonl(nfssvc_boot.tv_sec);
*p++ = htonl(nfssvc_boot.tv_usec);
}
return xdr_ressize_check(rqstp, p);
}
/* CREATE, MKDIR, SYMLINK, MKNOD */
int
nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_diropres *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, u32 *p,
struct nfsd3_renameres *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, u32 *p,
struct nfsd3_linkres *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, u32 *p,
struct nfsd3_readdirres *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_restailpage = 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 inline u32 *
encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name,
int namlen, ino_t 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 inline u32 *
encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p,
struct svc_fh *fhp)
{
p = encode_post_op_attr(cd->rqstp, p, fhp);
*p++ = xdr_one; /* yes, a file handle follows */
p = encode_fh(p, fhp);
fh_put(fhp);
return p;
}
static int
compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
const char *name, int namlen)
{
struct svc_export *exp;
struct dentry *dparent, *dchild;
int rv = 0;
dparent = cd->fh.fh_dentry;
exp = cd->fh.fh_export;
fh_init(fhp, NFS3_FHSIZE);
if (isdotent(name, namlen)) {
if (namlen == 2) {
dchild = dget_parent(dparent);
if (dchild == dparent) {
/* filesystem root - cannot return filehandle for ".." */
dput(dchild);
return 1;
}
} else
dchild = dget(dparent);
} else
dchild = lookup_one_len(name, dparent, namlen);
if (IS_ERR(dchild))
return 1;
if (d_mountpoint(dchild) ||
fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
!dchild->d_inode)
rv = 1;
dput(dchild);
return rv;
}
/*
* 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, off_t offset, ino_t ino, unsigned int d_type, int plus)
{
struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
common);
u32 *p = cd->buffer;
caddr_t curr_page_addr = NULL;
int pn; /* current page number */
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, (u64) offset);
}
}
/*
dprintk("encode_entry(%.*s @%ld%s)\n",
namlen, name, (long) offset, plus? " plus" : "");
*/
/* truncate filename if too long */
if (namlen > NFS3_MAXNAMLEN)
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 (pn=1; pn < cd->rqstp->rq_resused; pn++) {
curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
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);
/* throw in readdirplus baggage */
if (plus) {
struct svc_fh fh;
if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
*p++ = 0;
*p++ = 0;
} else
p = encode_entryplus_baggage(cd, p, &fh);
}
num_entry_words = p - cd->buffer;
} else if (cd->rqstp->rq_respages[pn+1] != NULL) {
/* temporarily encode entry into next page, then move back to
* current and next page in rq_respages[] */
u32 *p1, *tmp;
int len1, len2;
/* grab next page for temporary storage of entry */
p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
/* throw in readdirplus baggage */
if (plus) {
struct svc_fh fh;
if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
/* zero out the filehandle */
*p1++ = 0;
*p1++ = 0;
} else
p1 = encode_entryplus_baggage(cd, p1, &fh);
}
/* 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(struct readdir_cd *cd, const char *name,
int namlen, loff_t offset, ino_t ino, unsigned int d_type)
{
return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
}
int
nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name,
int namlen, loff_t offset, ino_t 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, u32 *p,
struct nfsd3_fsstatres *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, u32 *p,
struct nfsd3_fsinfores *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, u32 *p,
struct nfsd3_pathconfres *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, u32 *p,
struct nfsd3_commitres *resp)
{
p = encode_wcc_data(rqstp, p, &resp->fh);
/* Write verifier */
if (resp->status == 0) {
*p++ = htonl(nfssvc_boot.tv_sec);
*p++ = htonl(nfssvc_boot.tv_usec);
}
return xdr_ressize_check(rqstp, p);
}
/*
* XDR release functions
*/
int
nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_attrstat *resp)
{
fh_put(&resp->fh);
return 1;
}
int
nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p,
struct nfsd3_fhandle_pair *resp)
{
fh_put(&resp->fh1);
fh_put(&resp->fh2);
return 1;
}
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