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linux_dsm_epyc7002/fs/nfsd/nfs4xdr.c
Trond Myklebust 83a63072c8 nfsd: fix nfs read eof detection 
Currently, the knfsd server assumes that a short read indicates an
end of file. That assumption is incorrect. The short read means that
either we've hit the end of file, or we've hit a read error.

In the case of a read error, the client may want to retry (as per the
implementation recommendations in RFC1813 and RFC7530), but currently it
is being told that it hit an eof.

Move the code to detect eof from version specific code into the generic
nfsd read.

Report eof only in the two following cases:
1) read() returns a zero length short read with no error.
2) the offset+length of the read is >= the file size.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2019-09-23 16:24:08 -04:00

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/*
* Server-side XDR for NFSv4
*
* Copyright (c) 2002 The Regents of the University of Michigan.
* All rights reserved.
*
* Kendrick Smith <kmsmith@umich.edu>
* Andy Adamson <andros@umich.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/statfs.h>
#include <linux/utsname.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/svcauth_gss.h>
#include "idmap.h"
#include "acl.h"
#include "xdr4.h"
#include "vfs.h"
#include "state.h"
#include "cache.h"
#include "netns.h"
#include "pnfs.h"
#include "filecache.h"
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
#include <linux/security.h>
#endif
#define NFSDDBG_FACILITY NFSDDBG_XDR
const u32 nfsd_suppattrs[3][3] = {
{NFSD4_SUPPORTED_ATTRS_WORD0,
NFSD4_SUPPORTED_ATTRS_WORD1,
NFSD4_SUPPORTED_ATTRS_WORD2},
{NFSD4_1_SUPPORTED_ATTRS_WORD0,
NFSD4_1_SUPPORTED_ATTRS_WORD1,
NFSD4_1_SUPPORTED_ATTRS_WORD2},
{NFSD4_1_SUPPORTED_ATTRS_WORD0,
NFSD4_1_SUPPORTED_ATTRS_WORD1,
NFSD4_2_SUPPORTED_ATTRS_WORD2},
};
/*
* As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
* directory in order to indicate to the client that a filesystem boundary is present
* We use a fixed fsid for a referral
*/
#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
static __be32
check_filename(char *str, int len)
{
int i;
if (len == 0)
return nfserr_inval;
if (isdotent(str, len))
return nfserr_badname;
for (i = 0; i < len; i++)
if (str[i] == '/')
return nfserr_badname;
return 0;
}
#define DECODE_HEAD \
__be32 *p; \
__be32 status
#define DECODE_TAIL \
status = 0; \
out: \
return status; \
xdr_error: \
dprintk("NFSD: xdr error (%s:%d)\n", \
__FILE__, __LINE__); \
status = nfserr_bad_xdr; \
goto out
#define READMEM(x,nbytes) do { \
x = (char *)p; \
p += XDR_QUADLEN(nbytes); \
} while (0)
#define SAVEMEM(x,nbytes) do { \
if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
savemem(argp, p, nbytes) : \
(char *)p)) { \
dprintk("NFSD: xdr error (%s:%d)\n", \
__FILE__, __LINE__); \
goto xdr_error; \
} \
p += XDR_QUADLEN(nbytes); \
} while (0)
#define COPYMEM(x,nbytes) do { \
memcpy((x), p, nbytes); \
p += XDR_QUADLEN(nbytes); \
} while (0)
/* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
#define READ_BUF(nbytes) do { \
if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
p = argp->p; \
argp->p += XDR_QUADLEN(nbytes); \
} else if (!(p = read_buf(argp, nbytes))) { \
dprintk("NFSD: xdr error (%s:%d)\n", \
__FILE__, __LINE__); \
goto xdr_error; \
} \
} while (0)
static void next_decode_page(struct nfsd4_compoundargs *argp)
{
argp->p = page_address(argp->pagelist[0]);
argp->pagelist++;
if (argp->pagelen < PAGE_SIZE) {
argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
argp->pagelen = 0;
} else {
argp->end = argp->p + (PAGE_SIZE>>2);
argp->pagelen -= PAGE_SIZE;
}
}
static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
{
/* We want more bytes than seem to be available.
* Maybe we need a new page, maybe we have just run out
*/
unsigned int avail = (char *)argp->end - (char *)argp->p;
__be32 *p;
if (argp->pagelen == 0) {
struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
if (!argp->tail) {
argp->tail = true;
avail = vec->iov_len;
argp->p = vec->iov_base;
argp->end = vec->iov_base + avail;
}
if (avail < nbytes)
return NULL;
p = argp->p;
argp->p += XDR_QUADLEN(nbytes);
return p;
}
if (avail + argp->pagelen < nbytes)
return NULL;
if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
return NULL;
/* ok, we can do it with the current plus the next page */
if (nbytes <= sizeof(argp->tmp))
p = argp->tmp;
else {
kfree(argp->tmpp);
p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
if (!p)
return NULL;
}
/*
* The following memcpy is safe because read_buf is always
* called with nbytes > avail, and the two cases above both
* guarantee p points to at least nbytes bytes.
*/
memcpy(p, argp->p, avail);
next_decode_page(argp);
memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
argp->p += XDR_QUADLEN(nbytes - avail);
return p;
}
static unsigned int compoundargs_bytes_left(struct nfsd4_compoundargs *argp)
{
unsigned int this = (char *)argp->end - (char *)argp->p;
return this + argp->pagelen;
}
static int zero_clientid(clientid_t *clid)
{
return (clid->cl_boot == 0) && (clid->cl_id == 0);
}
/**
* svcxdr_tmpalloc - allocate memory to be freed after compound processing
* @argp: NFSv4 compound argument structure
* @len: length of buffer to allocate
*
* Allocates a buffer of size @len to be freed when processing the compound
* operation described in @argp finishes.
*/
static void *
svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
{
struct svcxdr_tmpbuf *tb;
tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
if (!tb)
return NULL;
tb->next = argp->to_free;
argp->to_free = tb;
return tb->buf;
}
/*
* For xdr strings that need to be passed to other kernel api's
* as null-terminated strings.
*
* Note null-terminating in place usually isn't safe since the
* buffer might end on a page boundary.
*/
static char *
svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
{
char *p = svcxdr_tmpalloc(argp, len + 1);
if (!p)
return NULL;
memcpy(p, buf, len);
p[len] = '\0';
return p;
}
/**
* savemem - duplicate a chunk of memory for later processing
* @argp: NFSv4 compound argument structure to be freed with
* @p: pointer to be duplicated
* @nbytes: length to be duplicated
*
* Returns a pointer to a copy of @nbytes bytes of memory at @p
* that are preserved until processing of the NFSv4 compound
* operation described by @argp finishes.
*/
static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
{
void *ret;
ret = svcxdr_tmpalloc(argp, nbytes);
if (!ret)
return NULL;
memcpy(ret, p, nbytes);
return ret;
}
static __be32
nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
{
DECODE_HEAD;
READ_BUF(12);
p = xdr_decode_hyper(p, &tv->tv_sec);
tv->tv_nsec = be32_to_cpup(p++);
if (tv->tv_nsec >= (u32)1000000000)
return nfserr_inval;
DECODE_TAIL;
}
static __be32
nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
{
u32 bmlen;
DECODE_HEAD;
bmval[0] = 0;
bmval[1] = 0;
bmval[2] = 0;
READ_BUF(4);
bmlen = be32_to_cpup(p++);
if (bmlen > 1000)
goto xdr_error;
READ_BUF(bmlen << 2);
if (bmlen > 0)
bmval[0] = be32_to_cpup(p++);
if (bmlen > 1)
bmval[1] = be32_to_cpup(p++);
if (bmlen > 2)
bmval[2] = be32_to_cpup(p++);
DECODE_TAIL;
}
static __be32
nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
struct iattr *iattr, struct nfs4_acl **acl,
struct xdr_netobj *label, int *umask)
{
int expected_len, len = 0;
u32 dummy32;
char *buf;
DECODE_HEAD;
iattr->ia_valid = 0;
if ((status = nfsd4_decode_bitmap(argp, bmval)))
return status;
if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
|| bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
|| bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
if (nfsd_attrs_supported(argp->minorversion, bmval))
return nfserr_inval;
return nfserr_attrnotsupp;
}
READ_BUF(4);
expected_len = be32_to_cpup(p++);
if (bmval[0] & FATTR4_WORD0_SIZE) {
READ_BUF(8);
len += 8;
p = xdr_decode_hyper(p, &iattr->ia_size);
iattr->ia_valid |= ATTR_SIZE;
}
if (bmval[0] & FATTR4_WORD0_ACL) {
u32 nace;
struct nfs4_ace *ace;
READ_BUF(4); len += 4;
nace = be32_to_cpup(p++);
if (nace > compoundargs_bytes_left(argp)/20)
/*
* Even with 4-byte names there wouldn't be
* space for that many aces; something fishy is
* going on:
*/
return nfserr_fbig;
*acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
if (*acl == NULL)
return nfserr_jukebox;
(*acl)->naces = nace;
for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
READ_BUF(16); len += 16;
ace->type = be32_to_cpup(p++);
ace->flag = be32_to_cpup(p++);
ace->access_mask = be32_to_cpup(p++);
dummy32 = be32_to_cpup(p++);
READ_BUF(dummy32);
len += XDR_QUADLEN(dummy32) << 2;
READMEM(buf, dummy32);
ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
status = nfs_ok;
if (ace->whotype != NFS4_ACL_WHO_NAMED)
;
else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
status = nfsd_map_name_to_gid(argp->rqstp,
buf, dummy32, &ace->who_gid);
else
status = nfsd_map_name_to_uid(argp->rqstp,
buf, dummy32, &ace->who_uid);
if (status)
return status;
}
} else
*acl = NULL;
if (bmval[1] & FATTR4_WORD1_MODE) {
READ_BUF(4);
len += 4;
iattr->ia_mode = be32_to_cpup(p++);
iattr->ia_mode &= (S_IFMT | S_IALLUGO);
iattr->ia_valid |= ATTR_MODE;
}
if (bmval[1] & FATTR4_WORD1_OWNER) {
READ_BUF(4);
len += 4;
dummy32 = be32_to_cpup(p++);
READ_BUF(dummy32);
len += (XDR_QUADLEN(dummy32) << 2);
READMEM(buf, dummy32);
if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
return status;
iattr->ia_valid |= ATTR_UID;
}
if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
READ_BUF(4);
len += 4;
dummy32 = be32_to_cpup(p++);
READ_BUF(dummy32);
len += (XDR_QUADLEN(dummy32) << 2);
READMEM(buf, dummy32);
if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
return status;
iattr->ia_valid |= ATTR_GID;
}
if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
READ_BUF(4);
len += 4;
dummy32 = be32_to_cpup(p++);
switch (dummy32) {
case NFS4_SET_TO_CLIENT_TIME:
len += 12;
status = nfsd4_decode_time(argp, &iattr->ia_atime);
if (status)
return status;
iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
break;
case NFS4_SET_TO_SERVER_TIME:
iattr->ia_valid |= ATTR_ATIME;
break;
default:
goto xdr_error;
}
}
if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
READ_BUF(4);
len += 4;
dummy32 = be32_to_cpup(p++);
switch (dummy32) {
case NFS4_SET_TO_CLIENT_TIME:
len += 12;
status = nfsd4_decode_time(argp, &iattr->ia_mtime);
if (status)
return status;
iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
break;
case NFS4_SET_TO_SERVER_TIME:
iattr->ia_valid |= ATTR_MTIME;
break;
default:
goto xdr_error;
}
}
label->len = 0;
if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
READ_BUF(4);
len += 4;
dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
READ_BUF(4);
len += 4;
dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
READ_BUF(4);
len += 4;
dummy32 = be32_to_cpup(p++);
READ_BUF(dummy32);
if (dummy32 > NFS4_MAXLABELLEN)
return nfserr_badlabel;
len += (XDR_QUADLEN(dummy32) << 2);
READMEM(buf, dummy32);
label->len = dummy32;
label->data = svcxdr_dupstr(argp, buf, dummy32);
if (!label->data)
return nfserr_jukebox;
}
if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
if (!umask)
goto xdr_error;
READ_BUF(8);
len += 8;
dummy32 = be32_to_cpup(p++);
iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
dummy32 = be32_to_cpup(p++);
*umask = dummy32 & S_IRWXUGO;
iattr->ia_valid |= ATTR_MODE;
}
if (len != expected_len)
goto xdr_error;
DECODE_TAIL;
}
static __be32
nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
{
DECODE_HEAD;
READ_BUF(sizeof(stateid_t));
sid->si_generation = be32_to_cpup(p++);
COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
DECODE_TAIL;
}
static __be32
nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
{
DECODE_HEAD;
READ_BUF(4);
access->ac_req_access = be32_to_cpup(p++);
DECODE_TAIL;
}
static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
{
DECODE_HEAD;
struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
u32 dummy, uid, gid;
char *machine_name;
int i;
int nr_secflavs;
/* callback_sec_params4 */
READ_BUF(4);
nr_secflavs = be32_to_cpup(p++);
if (nr_secflavs)
cbs->flavor = (u32)(-1);
else
/* Is this legal? Be generous, take it to mean AUTH_NONE: */
cbs->flavor = 0;
for (i = 0; i < nr_secflavs; ++i) {
READ_BUF(4);
dummy = be32_to_cpup(p++);
switch (dummy) {
case RPC_AUTH_NULL:
/* Nothing to read */
if (cbs->flavor == (u32)(-1))
cbs->flavor = RPC_AUTH_NULL;
break;
case RPC_AUTH_UNIX:
READ_BUF(8);
/* stamp */
dummy = be32_to_cpup(p++);
/* machine name */
dummy = be32_to_cpup(p++);
READ_BUF(dummy);
SAVEMEM(machine_name, dummy);
/* uid, gid */
READ_BUF(8);
uid = be32_to_cpup(p++);
gid = be32_to_cpup(p++);
/* more gids */
READ_BUF(4);
dummy = be32_to_cpup(p++);
READ_BUF(dummy * 4);
if (cbs->flavor == (u32)(-1)) {
kuid_t kuid = make_kuid(userns, uid);
kgid_t kgid = make_kgid(userns, gid);
if (uid_valid(kuid) && gid_valid(kgid)) {
cbs->uid = kuid;
cbs->gid = kgid;
cbs->flavor = RPC_AUTH_UNIX;
} else {
dprintk("RPC_AUTH_UNIX with invalid"
"uid or gid ignoring!\n");
}
}
break;
case RPC_AUTH_GSS:
dprintk("RPC_AUTH_GSS callback secflavor "
"not supported!\n");
READ_BUF(8);
/* gcbp_service */
dummy = be32_to_cpup(p++);
/* gcbp_handle_from_server */
dummy = be32_to_cpup(p++);
READ_BUF(dummy);
p += XDR_QUADLEN(dummy);
/* gcbp_handle_from_client */
READ_BUF(4);
dummy = be32_to_cpup(p++);
READ_BUF(dummy);
break;
default:
dprintk("Illegal callback secflavor\n");
return nfserr_inval;
}
}
DECODE_TAIL;
}
static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
{
DECODE_HEAD;
READ_BUF(4);
bc->bc_cb_program = be32_to_cpup(p++);
nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
DECODE_TAIL;
}
static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
{
DECODE_HEAD;
READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
bcts->dir = be32_to_cpup(p++);
/* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
* could help us figure out we should be using it. */
DECODE_TAIL;
}
static __be32
nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
{
DECODE_HEAD;
READ_BUF(4);
close->cl_seqid = be32_to_cpup(p++);
return nfsd4_decode_stateid(argp, &close->cl_stateid);
DECODE_TAIL;
}
static __be32
nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
{
DECODE_HEAD;
READ_BUF(12);
p = xdr_decode_hyper(p, &commit->co_offset);
commit->co_count = be32_to_cpup(p++);
DECODE_TAIL;
}
static __be32
nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
{
DECODE_HEAD;
READ_BUF(4);
create->cr_type = be32_to_cpup(p++);
switch (create->cr_type) {
case NF4LNK:
READ_BUF(4);
create->cr_datalen = be32_to_cpup(p++);
READ_BUF(create->cr_datalen);
create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
if (!create->cr_data)
return nfserr_jukebox;
break;
case NF4BLK:
case NF4CHR:
READ_BUF(8);
create->cr_specdata1 = be32_to_cpup(p++);
create->cr_specdata2 = be32_to_cpup(p++);
break;
case NF4SOCK:
case NF4FIFO:
case NF4DIR:
default:
break;
}
READ_BUF(4);
create->cr_namelen = be32_to_cpup(p++);
READ_BUF(create->cr_namelen);
SAVEMEM(create->cr_name, create->cr_namelen);
if ((status = check_filename(create->cr_name, create->cr_namelen)))
return status;
status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
&create->cr_acl, &create->cr_label,
&create->cr_umask);
if (status)
goto out;
DECODE_TAIL;
}
static inline __be32
nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
{
return nfsd4_decode_stateid(argp, &dr->dr_stateid);
}
static inline __be32
nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
{
return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
}
static __be32
nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
{
DECODE_HEAD;
READ_BUF(4);
link->li_namelen = be32_to_cpup(p++);
READ_BUF(link->li_namelen);
SAVEMEM(link->li_name, link->li_namelen);
if ((status = check_filename(link->li_name, link->li_namelen)))
return status;
DECODE_TAIL;
}
static __be32
nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
{
DECODE_HEAD;
/*
* type, reclaim(boolean), offset, length, new_lock_owner(boolean)
*/
READ_BUF(28);
lock->lk_type = be32_to_cpup(p++);
if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
goto xdr_error;
lock->lk_reclaim = be32_to_cpup(p++);
p = xdr_decode_hyper(p, &lock->lk_offset);
p = xdr_decode_hyper(p, &lock->lk_length);
lock->lk_is_new = be32_to_cpup(p++);
if (lock->lk_is_new) {
READ_BUF(4);
lock->lk_new_open_seqid = be32_to_cpup(p++);
status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
if (status)
return status;
READ_BUF(8 + sizeof(clientid_t));
lock->lk_new_lock_seqid = be32_to_cpup(p++);
COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
lock->lk_new_owner.len = be32_to_cpup(p++);
READ_BUF(lock->lk_new_owner.len);
READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
} else {
status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
if (status)
return status;
READ_BUF(4);
lock->lk_old_lock_seqid = be32_to_cpup(p++);
}
DECODE_TAIL;
}
static __be32
nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
{
DECODE_HEAD;
READ_BUF(32);
lockt->lt_type = be32_to_cpup(p++);
if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
goto xdr_error;
p = xdr_decode_hyper(p, &lockt->lt_offset);
p = xdr_decode_hyper(p, &lockt->lt_length);
COPYMEM(&lockt->lt_clientid, 8);
lockt->lt_owner.len = be32_to_cpup(p++);
READ_BUF(lockt->lt_owner.len);
READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
DECODE_TAIL;
}
static __be32
nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
{
DECODE_HEAD;
READ_BUF(8);
locku->lu_type = be32_to_cpup(p++);
if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
goto xdr_error;
locku->lu_seqid = be32_to_cpup(p++);
status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
if (status)
return status;
READ_BUF(16);
p = xdr_decode_hyper(p, &locku->lu_offset);
p = xdr_decode_hyper(p, &locku->lu_length);
DECODE_TAIL;
}
static __be32
nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
{
DECODE_HEAD;
READ_BUF(4);
lookup->lo_len = be32_to_cpup(p++);
READ_BUF(lookup->lo_len);
SAVEMEM(lookup->lo_name, lookup->lo_len);
if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
return status;
DECODE_TAIL;
}
static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
{
__be32 *p;
u32 w;
READ_BUF(4);
w = be32_to_cpup(p++);
*share_access = w & NFS4_SHARE_ACCESS_MASK;
*deleg_want = w & NFS4_SHARE_WANT_MASK;
if (deleg_when)
*deleg_when = w & NFS4_SHARE_WHEN_MASK;
switch (w & NFS4_SHARE_ACCESS_MASK) {
case NFS4_SHARE_ACCESS_READ:
case NFS4_SHARE_ACCESS_WRITE:
case NFS4_SHARE_ACCESS_BOTH:
break;
default:
return nfserr_bad_xdr;
}
w &= ~NFS4_SHARE_ACCESS_MASK;
if (!w)
return nfs_ok;
if (!argp->minorversion)
return nfserr_bad_xdr;
switch (w & NFS4_SHARE_WANT_MASK) {
case NFS4_SHARE_WANT_NO_PREFERENCE:
case NFS4_SHARE_WANT_READ_DELEG:
case NFS4_SHARE_WANT_WRITE_DELEG:
case NFS4_SHARE_WANT_ANY_DELEG:
case NFS4_SHARE_WANT_NO_DELEG:
case NFS4_SHARE_WANT_CANCEL:
break;
default:
return nfserr_bad_xdr;
}
w &= ~NFS4_SHARE_WANT_MASK;
if (!w)
return nfs_ok;
if (!deleg_when) /* open_downgrade */
return nfserr_inval;
switch (w) {
case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
return nfs_ok;
}
xdr_error:
return nfserr_bad_xdr;
}
static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
{
__be32 *p;
READ_BUF(4);
*x = be32_to_cpup(p++);
/* Note: unlinke access bits, deny bits may be zero. */
if (*x & ~NFS4_SHARE_DENY_BOTH)
return nfserr_bad_xdr;
return nfs_ok;
xdr_error:
return nfserr_bad_xdr;
}
static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
{
__be32 *p;
READ_BUF(4);
o->len = be32_to_cpup(p++);
if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
return nfserr_bad_xdr;
READ_BUF(o->len);
SAVEMEM(o->data, o->len);
return nfs_ok;
xdr_error:
return nfserr_bad_xdr;
}
static __be32
nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
{
DECODE_HEAD;
u32 dummy;
memset(open->op_bmval, 0, sizeof(open->op_bmval));
open->op_iattr.ia_valid = 0;
open->op_openowner = NULL;
open->op_xdr_error = 0;
/* seqid, share_access, share_deny, clientid, ownerlen */
READ_BUF(4);
open->op_seqid = be32_to_cpup(p++);
/* decode, yet ignore deleg_when until supported */
status = nfsd4_decode_share_access(argp, &open->op_share_access,
&open->op_deleg_want, &dummy);
if (status)
goto xdr_error;
status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
if (status)
goto xdr_error;
READ_BUF(sizeof(clientid_t));
COPYMEM(&open->op_clientid, sizeof(clientid_t));
status = nfsd4_decode_opaque(argp, &open->op_owner);
if (status)
goto xdr_error;
READ_BUF(4);
open->op_create = be32_to_cpup(p++);
switch (open->op_create) {
case NFS4_OPEN_NOCREATE:
break;
case NFS4_OPEN_CREATE:
READ_BUF(4);
open->op_createmode = be32_to_cpup(p++);
switch (open->op_createmode) {
case NFS4_CREATE_UNCHECKED:
case NFS4_CREATE_GUARDED:
status = nfsd4_decode_fattr(argp, open->op_bmval,
&open->op_iattr, &open->op_acl, &open->op_label,
&open->op_umask);
if (status)
goto out;
break;
case NFS4_CREATE_EXCLUSIVE:
READ_BUF(NFS4_VERIFIER_SIZE);
COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
break;
case NFS4_CREATE_EXCLUSIVE4_1:
if (argp->minorversion < 1)
goto xdr_error;
READ_BUF(NFS4_VERIFIER_SIZE);
COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
status = nfsd4_decode_fattr(argp, open->op_bmval,
&open->op_iattr, &open->op_acl, &open->op_label,
&open->op_umask);
if (status)
goto out;
break;
default:
goto xdr_error;
}
break;
default:
goto xdr_error;
}
/* open_claim */
READ_BUF(4);
open->op_claim_type = be32_to_cpup(p++);
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
READ_BUF(4);
open->op_fname.len = be32_to_cpup(p++);
READ_BUF(open->op_fname.len);
SAVEMEM(open->op_fname.data, open->op_fname.len);
if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
return status;
break;
case NFS4_OPEN_CLAIM_PREVIOUS:
READ_BUF(4);
open->op_delegate_type = be32_to_cpup(p++);
break;
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
if (status)
return status;
READ_BUF(4);
open->op_fname.len = be32_to_cpup(p++);
READ_BUF(open->op_fname.len);
SAVEMEM(open->op_fname.data, open->op_fname.len);
if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
return status;
break;
case NFS4_OPEN_CLAIM_FH:
case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
if (argp->minorversion < 1)
goto xdr_error;
/* void */
break;
case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
if (argp->minorversion < 1)
goto xdr_error;
status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
if (status)
return status;
break;
default:
goto xdr_error;
}
DECODE_TAIL;
}
static __be32
nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
{
DECODE_HEAD;
if (argp->minorversion >= 1)
return nfserr_notsupp;
status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
if (status)
return status;
READ_BUF(4);
open_conf->oc_seqid = be32_to_cpup(p++);
DECODE_TAIL;
}
static __be32
nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
{
DECODE_HEAD;
status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
if (status)
return status;
READ_BUF(4);
open_down->od_seqid = be32_to_cpup(p++);
status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
&open_down->od_deleg_want, NULL);
if (status)
return status;
status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
if (status)
return status;
DECODE_TAIL;
}
static __be32
nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
{
DECODE_HEAD;
READ_BUF(4);
putfh->pf_fhlen = be32_to_cpup(p++);
if (putfh->pf_fhlen > NFS4_FHSIZE)
goto xdr_error;
READ_BUF(putfh->pf_fhlen);
SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
DECODE_TAIL;
}
static __be32
nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
{
if (argp->minorversion == 0)
return nfs_ok;
return nfserr_notsupp;
}
static __be32
nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
{
DECODE_HEAD;
status = nfsd4_decode_stateid(argp, &read->rd_stateid);
if (status)
return status;
READ_BUF(12);
p = xdr_decode_hyper(p, &read->rd_offset);
read->rd_length = be32_to_cpup(p++);
DECODE_TAIL;
}
static __be32
nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
{
DECODE_HEAD;
READ_BUF(24);
p = xdr_decode_hyper(p, &readdir->rd_cookie);
COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
readdir->rd_dircount = be32_to_cpup(p++);
readdir->rd_maxcount = be32_to_cpup(p++);
if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
goto out;
DECODE_TAIL;
}
static __be32
nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
{
DECODE_HEAD;
READ_BUF(4);
remove->rm_namelen = be32_to_cpup(p++);
READ_BUF(remove->rm_namelen);
SAVEMEM(remove->rm_name, remove->rm_namelen);
if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
return status;
DECODE_TAIL;
}
static __be32
nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
{
DECODE_HEAD;
READ_BUF(4);
rename->rn_snamelen = be32_to_cpup(p++);
READ_BUF(rename->rn_snamelen);
SAVEMEM(rename->rn_sname, rename->rn_snamelen);
READ_BUF(4);
rename->rn_tnamelen = be32_to_cpup(p++);
READ_BUF(rename->rn_tnamelen);
SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
return status;
if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
return status;
DECODE_TAIL;
}
static __be32
nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
{
DECODE_HEAD;
if (argp->minorversion >= 1)
return nfserr_notsupp;
READ_BUF(sizeof(clientid_t));
COPYMEM(clientid, sizeof(clientid_t));
DECODE_TAIL;
}
static __be32
nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
struct nfsd4_secinfo *secinfo)
{
DECODE_HEAD;
READ_BUF(4);
secinfo->si_namelen = be32_to_cpup(p++);
READ_BUF(secinfo->si_namelen);
SAVEMEM(secinfo->si_name, secinfo->si_namelen);
status = check_filename(secinfo->si_name, secinfo->si_namelen);
if (status)
return status;
DECODE_TAIL;
}
static __be32
nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
struct nfsd4_secinfo_no_name *sin)
{
DECODE_HEAD;
READ_BUF(4);
sin->sin_style = be32_to_cpup(p++);
DECODE_TAIL;
}
static __be32
nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
{
__be32 status;
status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
if (status)
return status;
return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
&setattr->sa_acl, &setattr->sa_label, NULL);
}
static __be32
nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
{
DECODE_HEAD;
if (argp->minorversion >= 1)
return nfserr_notsupp;
READ_BUF(NFS4_VERIFIER_SIZE);
COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
status = nfsd4_decode_opaque(argp, &setclientid->se_name);
if (status)
return nfserr_bad_xdr;
READ_BUF(8);
setclientid->se_callback_prog = be32_to_cpup(p++);
setclientid->se_callback_netid_len = be32_to_cpup(p++);
READ_BUF(setclientid->se_callback_netid_len);
SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
READ_BUF(4);
setclientid->se_callback_addr_len = be32_to_cpup(p++);
READ_BUF(setclientid->se_callback_addr_len);
SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
READ_BUF(4);
setclientid->se_callback_ident = be32_to_cpup(p++);
DECODE_TAIL;
}
static __be32
nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
{
DECODE_HEAD;
if (argp->minorversion >= 1)
return nfserr_notsupp;
READ_BUF(8 + NFS4_VERIFIER_SIZE);
COPYMEM(&scd_c->sc_clientid, 8);
COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
DECODE_TAIL;
}
/* Also used for NVERIFY */
static __be32
nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
{
DECODE_HEAD;
if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
goto out;
/* For convenience's sake, we compare raw xdr'd attributes in
* nfsd4_proc_verify */
READ_BUF(4);
verify->ve_attrlen = be32_to_cpup(p++);
READ_BUF(verify->ve_attrlen);
SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
DECODE_TAIL;
}
static __be32
nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
{
int avail;
int len;
DECODE_HEAD;
status = nfsd4_decode_stateid(argp, &write->wr_stateid);
if (status)
return status;
READ_BUF(16);
p = xdr_decode_hyper(p, &write->wr_offset);
write->wr_stable_how = be32_to_cpup(p++);
if (write->wr_stable_how > NFS_FILE_SYNC)
goto xdr_error;
write->wr_buflen = be32_to_cpup(p++);
/* Sorry .. no magic macros for this.. *
* READ_BUF(write->wr_buflen);
* SAVEMEM(write->wr_buf, write->wr_buflen);
*/
avail = (char*)argp->end - (char*)argp->p;
if (avail + argp->pagelen < write->wr_buflen) {
dprintk("NFSD: xdr error (%s:%d)\n",
__FILE__, __LINE__);
goto xdr_error;
}
write->wr_head.iov_base = p;
write->wr_head.iov_len = avail;
write->wr_pagelist = argp->pagelist;
len = XDR_QUADLEN(write->wr_buflen) << 2;
if (len >= avail) {
int pages;
len -= avail;
pages = len >> PAGE_SHIFT;
argp->pagelist += pages;
argp->pagelen -= pages * PAGE_SIZE;
len -= pages * PAGE_SIZE;
next_decode_page(argp);
}
argp->p += XDR_QUADLEN(len);
DECODE_TAIL;
}
static __be32
nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
{
DECODE_HEAD;
if (argp->minorversion >= 1)
return nfserr_notsupp;
READ_BUF(12);
COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
rlockowner->rl_owner.len = be32_to_cpup(p++);
READ_BUF(rlockowner->rl_owner.len);
READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
return nfserr_inval;
DECODE_TAIL;
}
static __be32
nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
struct nfsd4_exchange_id *exid)
{
int dummy, tmp;
DECODE_HEAD;
READ_BUF(NFS4_VERIFIER_SIZE);
COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
status = nfsd4_decode_opaque(argp, &exid->clname);
if (status)
return nfserr_bad_xdr;
READ_BUF(4);
exid->flags = be32_to_cpup(p++);
/* Ignore state_protect4_a */
READ_BUF(4);
exid->spa_how = be32_to_cpup(p++);
switch (exid->spa_how) {
case SP4_NONE:
break;
case SP4_MACH_CRED:
/* spo_must_enforce */
status = nfsd4_decode_bitmap(argp,
exid->spo_must_enforce);
if (status)
goto out;
/* spo_must_allow */
status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
if (status)
goto out;
break;
case SP4_SSV:
/* ssp_ops */
READ_BUF(4);
dummy = be32_to_cpup(p++);
READ_BUF(dummy * 4);
p += dummy;
READ_BUF(4);
dummy = be32_to_cpup(p++);
READ_BUF(dummy * 4);
p += dummy;
/* ssp_hash_algs<> */
READ_BUF(4);
tmp = be32_to_cpup(p++);
while (tmp--) {
READ_BUF(4);
dummy = be32_to_cpup(p++);
READ_BUF(dummy);
p += XDR_QUADLEN(dummy);
}
/* ssp_encr_algs<> */
READ_BUF(4);
tmp = be32_to_cpup(p++);
while (tmp--) {
READ_BUF(4);
dummy = be32_to_cpup(p++);
READ_BUF(dummy);
p += XDR_QUADLEN(dummy);
}
/* ignore ssp_window and ssp_num_gss_handles: */
READ_BUF(8);
break;
default:
goto xdr_error;
}
READ_BUF(4); /* nfs_impl_id4 array length */
dummy = be32_to_cpup(p++);
if (dummy > 1)
goto xdr_error;
if (dummy == 1) {
status = nfsd4_decode_opaque(argp, &exid->nii_domain);
if (status)
goto xdr_error;
/* nii_name */
status = nfsd4_decode_opaque(argp, &exid->nii_name);
if (status)
goto xdr_error;
/* nii_date */
status = nfsd4_decode_time(argp, &exid->nii_time);
if (status)
goto xdr_error;
}
DECODE_TAIL;
}
static __be32
nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
struct nfsd4_create_session *sess)
{
DECODE_HEAD;
READ_BUF(16);
COPYMEM(&sess->clientid, 8);
sess->seqid = be32_to_cpup(p++);
sess->flags = be32_to_cpup(p++);
/* Fore channel attrs */
READ_BUF(28);
p++; /* headerpadsz is always 0 */
sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
sess->fore_channel.maxops = be32_to_cpup(p++);
sess->fore_channel.maxreqs = be32_to_cpup(p++);
sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
if (sess->fore_channel.nr_rdma_attrs == 1) {
READ_BUF(4);
sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
} else if (sess->fore_channel.nr_rdma_attrs > 1) {
dprintk("Too many fore channel attr bitmaps!\n");
goto xdr_error;
}
/* Back channel attrs */
READ_BUF(28);
p++; /* headerpadsz is always 0 */
sess->back_channel.maxreq_sz = be32_to_cpup(p++);
sess->back_channel.maxresp_sz = be32_to_cpup(p++);
sess->back_channel.maxresp_cached = be32_to_cpup(p++);
sess->back_channel.maxops = be32_to_cpup(p++);
sess->back_channel.maxreqs = be32_to_cpup(p++);
sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
if (sess->back_channel.nr_rdma_attrs == 1) {
READ_BUF(4);
sess->back_channel.rdma_attrs = be32_to_cpup(p++);
} else if (sess->back_channel.nr_rdma_attrs > 1) {
dprintk("Too many back channel attr bitmaps!\n");
goto xdr_error;
}
READ_BUF(4);
sess->callback_prog = be32_to_cpup(p++);
nfsd4_decode_cb_sec(argp, &sess->cb_sec);
DECODE_TAIL;
}
static __be32
nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
struct nfsd4_destroy_session *destroy_session)
{
DECODE_HEAD;
READ_BUF(NFS4_MAX_SESSIONID_LEN);
COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
DECODE_TAIL;
}
static __be32
nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
struct nfsd4_free_stateid *free_stateid)
{
DECODE_HEAD;
READ_BUF(sizeof(stateid_t));
free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
DECODE_TAIL;
}
static __be32
nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
struct nfsd4_sequence *seq)
{
DECODE_HEAD;
READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
seq->seqid = be32_to_cpup(p++);
seq->slotid = be32_to_cpup(p++);
seq->maxslots = be32_to_cpup(p++);
seq->cachethis = be32_to_cpup(p++);
DECODE_TAIL;
}
static __be32
nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
{
int i;
__be32 *p, status;
struct nfsd4_test_stateid_id *stateid;
READ_BUF(4);
test_stateid->ts_num_ids = ntohl(*p++);
INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
for (i = 0; i < test_stateid->ts_num_ids; i++) {
stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
if (!stateid) {
status = nfserrno(-ENOMEM);
goto out;
}
INIT_LIST_HEAD(&stateid->ts_id_list);
list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
if (status)
goto out;
}
status = 0;
out:
return status;
xdr_error:
dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
status = nfserr_bad_xdr;
goto out;
}
static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
{
DECODE_HEAD;
READ_BUF(8);
COPYMEM(&dc->clientid, 8);
DECODE_TAIL;
}
static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
{
DECODE_HEAD;
READ_BUF(4);
rc->rca_one_fs = be32_to_cpup(p++);
DECODE_TAIL;
}
#ifdef CONFIG_NFSD_PNFS
static __be32
nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
struct nfsd4_getdeviceinfo *gdev)
{
DECODE_HEAD;
u32 num, i;
READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
gdev->gd_layout_type = be32_to_cpup(p++);
gdev->gd_maxcount = be32_to_cpup(p++);
num = be32_to_cpup(p++);
if (num) {
if (num > 1000)
goto xdr_error;
READ_BUF(4 * num);
gdev->gd_notify_types = be32_to_cpup(p++);
for (i = 1; i < num; i++) {
if (be32_to_cpup(p++)) {
status = nfserr_inval;
goto out;
}
}
}
DECODE_TAIL;
}
static __be32
nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
struct nfsd4_layoutget *lgp)
{
DECODE_HEAD;
READ_BUF(36);
lgp->lg_signal = be32_to_cpup(p++);
lgp->lg_layout_type = be32_to_cpup(p++);
lgp->lg_seg.iomode = be32_to_cpup(p++);
p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
p = xdr_decode_hyper(p, &lgp->lg_seg.length);
p = xdr_decode_hyper(p, &lgp->lg_minlength);
status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
if (status)
return status;
READ_BUF(4);
lgp->lg_maxcount = be32_to_cpup(p++);
DECODE_TAIL;
}
static __be32
nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
struct nfsd4_layoutcommit *lcp)
{
DECODE_HEAD;
u32 timechange;
READ_BUF(20);
p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
p = xdr_decode_hyper(p, &lcp->lc_seg.length);
lcp->lc_reclaim = be32_to_cpup(p++);
status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
if (status)
return status;
READ_BUF(4);
lcp->lc_newoffset = be32_to_cpup(p++);
if (lcp->lc_newoffset) {
READ_BUF(8);
p = xdr_decode_hyper(p, &lcp->lc_last_wr);
} else
lcp->lc_last_wr = 0;
READ_BUF(4);
timechange = be32_to_cpup(p++);
if (timechange) {
status = nfsd4_decode_time(argp, &lcp->lc_mtime);
if (status)
return status;
} else {
lcp->lc_mtime.tv_nsec = UTIME_NOW;
}
READ_BUF(8);
lcp->lc_layout_type = be32_to_cpup(p++);
/*
* Save the layout update in XDR format and let the layout driver deal
* with it later.
*/
lcp->lc_up_len = be32_to_cpup(p++);
if (lcp->lc_up_len > 0) {
READ_BUF(lcp->lc_up_len);
READMEM(lcp->lc_up_layout, lcp->lc_up_len);
}
DECODE_TAIL;
}
static __be32
nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
struct nfsd4_layoutreturn *lrp)
{
DECODE_HEAD;
READ_BUF(16);
lrp->lr_reclaim = be32_to_cpup(p++);
lrp->lr_layout_type = be32_to_cpup(p++);
lrp->lr_seg.iomode = be32_to_cpup(p++);
lrp->lr_return_type = be32_to_cpup(p++);
if (lrp->lr_return_type == RETURN_FILE) {
READ_BUF(16);
p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
p = xdr_decode_hyper(p, &lrp->lr_seg.length);
status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
if (status)
return status;
READ_BUF(4);
lrp->lrf_body_len = be32_to_cpup(p++);
if (lrp->lrf_body_len > 0) {
READ_BUF(lrp->lrf_body_len);
READMEM(lrp->lrf_body, lrp->lrf_body_len);
}
} else {
lrp->lr_seg.offset = 0;
lrp->lr_seg.length = NFS4_MAX_UINT64;
}
DECODE_TAIL;
}
#endif /* CONFIG_NFSD_PNFS */
static __be32
nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
struct nfsd4_fallocate *fallocate)
{
DECODE_HEAD;
status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
if (status)
return status;
READ_BUF(16);
p = xdr_decode_hyper(p, &fallocate->falloc_offset);
xdr_decode_hyper(p, &fallocate->falloc_length);
DECODE_TAIL;
}
static __be32
nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
{
DECODE_HEAD;
status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
if (status)
return status;
status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
if (status)
return status;
READ_BUF(8 + 8 + 8);
p = xdr_decode_hyper(p, &clone->cl_src_pos);
p = xdr_decode_hyper(p, &clone->cl_dst_pos);
p = xdr_decode_hyper(p, &clone->cl_count);
DECODE_TAIL;
}
static __be32
nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
{
DECODE_HEAD;
status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
if (status)
return status;
status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
if (status)
return status;
READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
p = xdr_decode_hyper(p, &copy->cp_src_pos);
p = xdr_decode_hyper(p, &copy->cp_dst_pos);
p = xdr_decode_hyper(p, &copy->cp_count);
p++; /* ca_consecutive: we always do consecutive copies */
copy->cp_synchronous = be32_to_cpup(p++);
/* tmp = be32_to_cpup(p); Source server list not supported */
DECODE_TAIL;
}
static __be32
nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
struct nfsd4_offload_status *os)
{
return nfsd4_decode_stateid(argp, &os->stateid);
}
static __be32
nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
{
DECODE_HEAD;
status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
if (status)
return status;
READ_BUF(8 + 4);
p = xdr_decode_hyper(p, &seek->seek_offset);
seek->seek_whence = be32_to_cpup(p);
DECODE_TAIL;
}
static __be32
nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
{
return nfs_ok;
}
static __be32
nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
{
return nfserr_notsupp;
}
typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
static const nfsd4_dec nfsd4_dec_ops[] = {
[OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
[OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
[OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
[OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
[OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
[OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
[OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
[OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
[OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
[OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
[OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
[OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
[OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
[OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
[OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
[OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
[OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
[OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
[OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
[OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
[OP_READ] = (nfsd4_dec)nfsd4_decode_read,
[OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
[OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
[OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
[OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
[OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
[OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
[OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
[OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
[OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
[OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
[OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
[OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
[OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
[OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
/* new operations for NFSv4.1 */
[OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
[OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
[OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
[OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
[OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
[OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
[OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
#ifdef CONFIG_NFSD_PNFS
[OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
[OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
[OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
[OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
#else
[OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
#endif
[OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
[OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
[OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
[OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
[OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
/* new operations for NFSv4.2 */
[OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
[OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
[OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
[OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_offload_status,
[OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_offload_status,
[OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
[OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
};
static inline bool
nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
{
if (op->opnum < FIRST_NFS4_OP)
return false;
else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
return false;
else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
return false;
else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
return false;
return true;
}
static __be32
nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
{
DECODE_HEAD;
struct nfsd4_op *op;
bool cachethis = false;
int auth_slack= argp->rqstp->rq_auth_slack;
int max_reply = auth_slack + 8; /* opcnt, status */
int readcount = 0;
int readbytes = 0;
int i;
READ_BUF(4);
argp->taglen = be32_to_cpup(p++);
READ_BUF(argp->taglen);
SAVEMEM(argp->tag, argp->taglen);
READ_BUF(8);
argp->minorversion = be32_to_cpup(p++);
argp->opcnt = be32_to_cpup(p++);
max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
if (argp->taglen > NFSD4_MAX_TAGLEN)
goto xdr_error;
/*
* NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
* here, so we return success at the xdr level so that
* nfsd4_proc can handle this is an NFS-level error.
*/
if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
return 0;
if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
if (!argp->ops) {
argp->ops = argp->iops;
dprintk("nfsd: couldn't allocate room for COMPOUND\n");
goto xdr_error;
}
}
if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
argp->opcnt = 0;
for (i = 0; i < argp->opcnt; i++) {
op = &argp->ops[i];
op->replay = NULL;
READ_BUF(4);
op->opnum = be32_to_cpup(p++);
if (nfsd4_opnum_in_range(argp, op))
op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
else {
op->opnum = OP_ILLEGAL;
op->status = nfserr_op_illegal;
}
op->opdesc = OPDESC(op);
/*
* We'll try to cache the result in the DRC if any one
* op in the compound wants to be cached:
*/
cachethis |= nfsd4_cache_this_op(op);
if (op->opnum == OP_READ) {
readcount++;
readbytes += nfsd4_max_reply(argp->rqstp, op);
} else
max_reply += nfsd4_max_reply(argp->rqstp, op);
/*
* OP_LOCK and OP_LOCKT may return a conflicting lock.
* (Special case because it will just skip encoding this
* if it runs out of xdr buffer space, and it is the only
* operation that behaves this way.)
*/
if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
max_reply += NFS4_OPAQUE_LIMIT;
if (op->status) {
argp->opcnt = i+1;
break;
}
}
/* Sessions make the DRC unnecessary: */
if (argp->minorversion)
cachethis = false;
svc_reserve(argp->rqstp, max_reply + readbytes);
argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
DECODE_TAIL;
}
static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
struct svc_export *exp)
{
if (exp->ex_flags & NFSEXP_V4ROOT) {
*p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
*p++ = 0;
} else if (IS_I_VERSION(inode)) {
p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
} else {
*p++ = cpu_to_be32(stat->ctime.tv_sec);
*p++ = cpu_to_be32(stat->ctime.tv_nsec);
}
return p;
}
/*
* ctime (in NFSv4, time_metadata) is not writeable, and the client
* doesn't really care what resolution could theoretically be stored by
* the filesystem.
*
* The client cares how close together changes can be while still
* guaranteeing ctime changes. For most filesystems (which have
* timestamps with nanosecond fields) that is limited by the resolution
* of the time returned from current_time() (which I'm assuming to be
* 1/HZ).
*/
static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
{
struct timespec ts;
u32 ns;
ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
ts = ns_to_timespec(ns);
p = xdr_encode_hyper(p, ts.tv_sec);
*p++ = cpu_to_be32(ts.tv_nsec);
return p;
}
static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
{
*p++ = cpu_to_be32(c->atomic);
if (c->change_supported) {
p = xdr_encode_hyper(p, c->before_change);
p = xdr_encode_hyper(p, c->after_change);
} else {
*p++ = cpu_to_be32(c->before_ctime_sec);
*p++ = cpu_to_be32(c->before_ctime_nsec);
*p++ = cpu_to_be32(c->after_ctime_sec);
*p++ = cpu_to_be32(c->after_ctime_nsec);
}
return p;
}
/* Encode as an array of strings the string given with components
* separated @sep, escaped with esc_enter and esc_exit.
*/
static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
char *components, char esc_enter,
char esc_exit)
{
__be32 *p;
__be32 pathlen;
int pathlen_offset;
int strlen, count=0;
char *str, *end, *next;
dprintk("nfsd4_encode_components(%s)\n", components);
pathlen_offset = xdr->buf->len;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
p++; /* We will fill this in with @count later */
end = str = components;
while (*end) {
bool found_esc = false;
/* try to parse as esc_start, ..., esc_end, sep */
if (*str == esc_enter) {
for (; *end && (*end != esc_exit); end++)
/* find esc_exit or end of string */;
next = end + 1;
if (*end && (!*next || *next == sep)) {
str++;
found_esc = true;
}
}
if (!found_esc)
for (; *end && (*end != sep); end++)
/* find sep or end of string */;
strlen = end - str;
if (strlen) {
p = xdr_reserve_space(xdr, strlen + 4);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque(p, str, strlen);
count++;
}
else
end++;
if (found_esc)
end = next;
str = end;
}
pathlen = htonl(count);
write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
return 0;
}
/* Encode as an array of strings the string given with components
* separated @sep.
*/
static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
char *components)
{
return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
}
/*
* encode a location element of a fs_locations structure
*/
static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
struct nfsd4_fs_location *location)
{
__be32 status;
status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
'[', ']');
if (status)
return status;
status = nfsd4_encode_components(xdr, '/', location->path);
if (status)
return status;
return 0;
}
/*
* Encode a path in RFC3530 'pathname4' format
*/
static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
const struct path *root,
const struct path *path)
{
struct path cur = *path;
__be32 *p;
struct dentry **components = NULL;
unsigned int ncomponents = 0;
__be32 err = nfserr_jukebox;
dprintk("nfsd4_encode_components(");
path_get(&cur);
/* First walk the path up to the nfsd root, and store the
* dentries/path components in an array.
*/
for (;;) {
if (path_equal(&cur, root))
break;
if (cur.dentry == cur.mnt->mnt_root) {
if (follow_up(&cur))
continue;
goto out_free;
}
if ((ncomponents & 15) == 0) {
struct dentry **new;
new = krealloc(components,
sizeof(*new) * (ncomponents + 16),
GFP_KERNEL);
if (!new)
goto out_free;
components = new;
}
components[ncomponents++] = cur.dentry;
cur.dentry = dget_parent(cur.dentry);
}
err = nfserr_resource;
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_free;
*p++ = cpu_to_be32(ncomponents);
while (ncomponents) {
struct dentry *dentry = components[ncomponents - 1];
unsigned int len;
spin_lock(&dentry->d_lock);
len = dentry->d_name.len;
p = xdr_reserve_space(xdr, len + 4);
if (!p) {
spin_unlock(&dentry->d_lock);
goto out_free;
}
p = xdr_encode_opaque(p, dentry->d_name.name, len);
dprintk("/%pd", dentry);
spin_unlock(&dentry->d_lock);
dput(dentry);
ncomponents--;
}
err = 0;
out_free:
dprintk(")\n");
while (ncomponents)
dput(components[--ncomponents]);
kfree(components);
path_put(&cur);
return err;
}
static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
struct svc_rqst *rqstp, const struct path *path)
{
struct svc_export *exp_ps;
__be32 res;
exp_ps = rqst_find_fsidzero_export(rqstp);
if (IS_ERR(exp_ps))
return nfserrno(PTR_ERR(exp_ps));
res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
exp_put(exp_ps);
return res;
}
/*
* encode a fs_locations structure
*/
static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
struct svc_rqst *rqstp, struct svc_export *exp)
{
__be32 status;
int i;
__be32 *p;
struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
if (status)
return status;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(fslocs->locations_count);
for (i=0; i<fslocs->locations_count; i++) {
status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
if (status)
return status;
}
return 0;
}
static u32 nfs4_file_type(umode_t mode)
{
switch (mode & S_IFMT) {
case S_IFIFO: return NF4FIFO;
case S_IFCHR: return NF4CHR;
case S_IFDIR: return NF4DIR;
case S_IFBLK: return NF4BLK;
case S_IFLNK: return NF4LNK;
case S_IFREG: return NF4REG;
case S_IFSOCK: return NF4SOCK;
default: return NF4BAD;
};
}
static inline __be32
nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
struct nfs4_ace *ace)
{
if (ace->whotype != NFS4_ACL_WHO_NAMED)
return nfs4_acl_write_who(xdr, ace->whotype);
else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
else
return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
}
static inline __be32
nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
{
__be32 *p;
unsigned long i = hweight_long(layout_types);
p = xdr_reserve_space(xdr, 4 + 4 * i);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(i);
for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
if (layout_types & (1 << i))
*p++ = cpu_to_be32(i);
return 0;
}
#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
FATTR4_WORD0_RDATTR_ERROR)
#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
#define WORD2_ABSENT_FS_ATTRS 0
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
static inline __be32
nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
void *context, int len)
{
__be32 *p;
p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
if (!p)
return nfserr_resource;
/*
* For now we use a 0 here to indicate the null translation; in
* the future we may place a call to translation code here.
*/
*p++ = cpu_to_be32(0); /* lfs */
*p++ = cpu_to_be32(0); /* pi */
p = xdr_encode_opaque(p, context, len);
return 0;
}
#else
static inline __be32
nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
void *context, int len)
{ return 0; }
#endif
static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
{
/* As per referral draft: */
if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
*bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
*bmval0 & FATTR4_WORD0_FS_LOCATIONS)
*rdattr_err = NFSERR_MOVED;
else
return nfserr_moved;
}
*bmval0 &= WORD0_ABSENT_FS_ATTRS;
*bmval1 &= WORD1_ABSENT_FS_ATTRS;
*bmval2 &= WORD2_ABSENT_FS_ATTRS;
return 0;
}
static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
{
struct path path = exp->ex_path;
int err;
path_get(&path);
while (follow_up(&path)) {
if (path.dentry != path.mnt->mnt_root)
break;
}
err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
path_put(&path);
return err;
}
static __be32
nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
{
__be32 *p;
if (bmval2) {
p = xdr_reserve_space(xdr, 16);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(3);
*p++ = cpu_to_be32(bmval0);
*p++ = cpu_to_be32(bmval1);
*p++ = cpu_to_be32(bmval2);
} else if (bmval1) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(2);
*p++ = cpu_to_be32(bmval0);
*p++ = cpu_to_be32(bmval1);
} else {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
*p++ = cpu_to_be32(bmval0);
}
return 0;
out_resource:
return nfserr_resource;
}
/*
* Note: @fhp can be NULL; in this case, we might have to compose the filehandle
* ourselves.
*/
static __be32
nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
struct svc_export *exp,
struct dentry *dentry, u32 *bmval,
struct svc_rqst *rqstp, int ignore_crossmnt)
{
u32 bmval0 = bmval[0];
u32 bmval1 = bmval[1];
u32 bmval2 = bmval[2];
struct kstat stat;
struct svc_fh *tempfh = NULL;
struct kstatfs statfs;
__be32 *p;
int starting_len = xdr->buf->len;
int attrlen_offset;
__be32 attrlen;
u32 dummy;
u64 dummy64;
u32 rdattr_err = 0;
__be32 status;
int err;
struct nfs4_acl *acl = NULL;
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
void *context = NULL;
int contextlen;
#endif
bool contextsupport = false;
struct nfsd4_compoundres *resp = rqstp->rq_resp;
u32 minorversion = resp->cstate.minorversion;
struct path path = {
.mnt = exp->ex_path.mnt,
.dentry = dentry,
};
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
if (exp->ex_fslocs.migrated) {
status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
if (status)
goto out;
}
err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
if (err)
goto out_nfserr;
if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
(bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
FATTR4_WORD1_SPACE_TOTAL))) {
err = vfs_statfs(&path, &statfs);
if (err)
goto out_nfserr;
}
if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
status = nfserr_jukebox;
if (!tempfh)
goto out;
fh_init(tempfh, NFS4_FHSIZE);
status = fh_compose(tempfh, exp, dentry, NULL);
if (status)
goto out;
fhp = tempfh;
}
if (bmval0 & FATTR4_WORD0_ACL) {
err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
if (err == -EOPNOTSUPP)
bmval0 &= ~FATTR4_WORD0_ACL;
else if (err == -EINVAL) {
status = nfserr_attrnotsupp;
goto out;
} else if (err != 0)
goto out_nfserr;
}
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
err = security_inode_getsecctx(d_inode(dentry),
&context, &contextlen);
else
err = -EOPNOTSUPP;
contextsupport = (err == 0);
if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
if (err == -EOPNOTSUPP)
bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
else if (err)
goto out_nfserr;
}
}
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
if (status)
goto out;
attrlen_offset = xdr->buf->len;
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
p++; /* to be backfilled later */
if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
u32 supp[3];
memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
if (!IS_POSIXACL(dentry->d_inode))
supp[0] &= ~FATTR4_WORD0_ACL;
if (!contextsupport)
supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
if (!supp[2]) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(2);
*p++ = cpu_to_be32(supp[0]);
*p++ = cpu_to_be32(supp[1]);
} else {
p = xdr_reserve_space(xdr, 16);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(3);
*p++ = cpu_to_be32(supp[0]);
*p++ = cpu_to_be32(supp[1]);
*p++ = cpu_to_be32(supp[2]);
}
}
if (bmval0 & FATTR4_WORD0_TYPE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
dummy = nfs4_file_type(stat.mode);
if (dummy == NF4BAD) {
status = nfserr_serverfault;
goto out;
}
*p++ = cpu_to_be32(dummy);
}
if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
*p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
else
*p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
NFS4_FH_VOL_RENAME);
}
if (bmval0 & FATTR4_WORD0_CHANGE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = encode_change(p, &stat, d_inode(dentry), exp);
}
if (bmval0 & FATTR4_WORD0_SIZE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, stat.size);
}
if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(0);
}
if (bmval0 & FATTR4_WORD0_FSID) {
p = xdr_reserve_space(xdr, 16);
if (!p)
goto out_resource;
if (exp->ex_fslocs.migrated) {
p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
} else switch(fsid_source(fhp)) {
case FSIDSOURCE_FSID:
p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
p = xdr_encode_hyper(p, (u64)0);
break;
case FSIDSOURCE_DEV:
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(MAJOR(stat.dev));
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(MINOR(stat.dev));
break;
case FSIDSOURCE_UUID:
p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
EX_UUID_LEN);
break;
}
}
if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(0);
}
if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(nn->nfsd4_lease);
}
if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(rdattr_err);
}
if (bmval0 & FATTR4_WORD0_ACL) {
struct nfs4_ace *ace;
if (acl == NULL) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(0);
goto out_acl;
}
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(acl->naces);
for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
p = xdr_reserve_space(xdr, 4*3);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(ace->type);
*p++ = cpu_to_be32(ace->flag);
*p++ = cpu_to_be32(ace->access_mask &
NFS4_ACE_MASK_ALL);
status = nfsd4_encode_aclname(xdr, rqstp, ace);
if (status)
goto out;
}
}
out_acl:
if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
}
if (bmval0 & FATTR4_WORD0_CANSETTIME) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(0);
}
if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
if (!p)
goto out_resource;
p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
fhp->fh_handle.fh_size);
}
if (bmval0 & FATTR4_WORD0_FILEID) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, stat.ino);
}
if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
}
if (bmval0 & FATTR4_WORD0_FILES_FREE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
}
if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) statfs.f_files);
}
if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
if (status)
goto out;
}
if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
}
if (bmval0 & FATTR4_WORD0_MAXLINK) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(255);
}
if (bmval0 & FATTR4_WORD0_MAXNAME) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(statfs.f_namelen);
}
if (bmval0 & FATTR4_WORD0_MAXREAD) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
}
if (bmval0 & FATTR4_WORD0_MAXWRITE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
}
if (bmval1 & FATTR4_WORD1_MODE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(stat.mode & S_IALLUGO);
}
if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval1 & FATTR4_WORD1_NUMLINKS) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(stat.nlink);
}
if (bmval1 & FATTR4_WORD1_OWNER) {
status = nfsd4_encode_user(xdr, rqstp, stat.uid);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
status = nfsd4_encode_group(xdr, rqstp, stat.gid);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_RAWDEV) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
*p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
*p++ = cpu_to_be32((u32) MINOR(stat.rdev));
}
if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_SPACE_USED) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)stat.blocks << 9;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
*p++ = cpu_to_be32(stat.atime.tv_nsec);
}
if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
p = encode_time_delta(p, d_inode(dentry));
}
if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
*p++ = cpu_to_be32(stat.ctime.tv_nsec);
}
if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
*p++ = cpu_to_be32(stat.mtime.tv_nsec);
}
if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
struct kstat parent_stat;
u64 ino = stat.ino;
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
/*
* Get parent's attributes if not ignoring crossmount
* and this is the root of a cross-mounted filesystem.
*/
if (ignore_crossmnt == 0 &&
dentry == exp->ex_path.mnt->mnt_root) {
err = get_parent_attributes(exp, &parent_stat);
if (err)
goto out_nfserr;
ino = parent_stat.ino;
}
p = xdr_encode_hyper(p, ino);
}
#ifdef CONFIG_NFSD_PNFS
if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
if (status)
goto out;
}
if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
if (status)
goto out;
}
if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(stat.blksize);
}
#endif /* CONFIG_NFSD_PNFS */
if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
u32 supp[3];
memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
if (status)
goto out;
}
if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
if (IS_I_VERSION(d_inode(dentry)))
*p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
else
*p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
}
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
status = nfsd4_encode_security_label(xdr, rqstp, context,
contextlen);
if (status)
goto out;
}
#endif
attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
status = nfs_ok;
out:
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
if (context)
security_release_secctx(context, contextlen);
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
kfree(acl);
if (tempfh) {
fh_put(tempfh);
kfree(tempfh);
}
if (status)
xdr_truncate_encode(xdr, starting_len);
return status;
out_nfserr:
status = nfserrno(err);
goto out;
out_resource:
status = nfserr_resource;
goto out;
}
static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
struct xdr_buf *buf, __be32 *p, int bytes)
{
xdr->scratch.iov_len = 0;
memset(buf, 0, sizeof(struct xdr_buf));
buf->head[0].iov_base = p;
buf->head[0].iov_len = 0;
buf->len = 0;
xdr->buf = buf;
xdr->iov = buf->head;
xdr->p = p;
xdr->end = (void *)p + bytes;
buf->buflen = bytes;
}
__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
struct svc_fh *fhp, struct svc_export *exp,
struct dentry *dentry, u32 *bmval,
struct svc_rqst *rqstp, int ignore_crossmnt)
{
struct xdr_buf dummy;
struct xdr_stream xdr;
__be32 ret;
svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
ignore_crossmnt);
*p = xdr.p;
return ret;
}
static inline int attributes_need_mount(u32 *bmval)
{
if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
return 1;
if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
return 1;
return 0;
}
static __be32
nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
const char *name, int namlen)
{
struct svc_export *exp = cd->rd_fhp->fh_export;
struct dentry *dentry;
__be32 nfserr;
int ignore_crossmnt = 0;
dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
if (IS_ERR(dentry))
return nfserrno(PTR_ERR(dentry));
if (d_really_is_negative(dentry)) {
/*
* we're not holding the i_mutex here, so there's
* a window where this directory entry could have gone
* away.
*/
dput(dentry);
return nfserr_noent;
}
exp_get(exp);
/*
* In the case of a mountpoint, the client may be asking for
* attributes that are only properties of the underlying filesystem
* as opposed to the cross-mounted file system. In such a case,
* we will not follow the cross mount and will fill the attribtutes
* directly from the mountpoint dentry.
*/
if (nfsd_mountpoint(dentry, exp)) {
int err;
if (!(exp->ex_flags & NFSEXP_V4ROOT)
&& !attributes_need_mount(cd->rd_bmval)) {
ignore_crossmnt = 1;
goto out_encode;
}
/*
* Why the heck aren't we just using nfsd_lookup??
* Different "."/".." handling? Something else?
* At least, add a comment here to explain....
*/
err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
if (err) {
nfserr = nfserrno(err);
goto out_put;
}
nfserr = check_nfsd_access(exp, cd->rd_rqstp);
if (nfserr)
goto out_put;
}
out_encode:
nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
cd->rd_rqstp, ignore_crossmnt);
out_put:
dput(dentry);
exp_put(exp);
return nfserr;
}
static __be32 *
nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
{
__be32 *p;
p = xdr_reserve_space(xdr, 20);
if (!p)
return NULL;
*p++ = htonl(2);
*p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
*p++ = htonl(0); /* bmval1 */
*p++ = htonl(4); /* attribute length */
*p++ = nfserr; /* no htonl */
return p;
}
static int
nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct readdir_cd *ccd = ccdv;
struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
struct xdr_stream *xdr = cd->xdr;
int start_offset = xdr->buf->len;
int cookie_offset;
u32 name_and_cookie;
int entry_bytes;
__be32 nfserr = nfserr_toosmall;
__be64 wire_offset;
__be32 *p;
/* In nfsv4, "." and ".." never make it onto the wire.. */
if (name && isdotent(name, namlen)) {
cd->common.err = nfs_ok;
return 0;
}
if (cd->cookie_offset) {
wire_offset = cpu_to_be64(offset);
write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
&wire_offset, 8);
}
p = xdr_reserve_space(xdr, 4);
if (!p)
goto fail;
*p++ = xdr_one; /* mark entry present */
cookie_offset = xdr->buf->len;
p = xdr_reserve_space(xdr, 3*4 + namlen);
if (!p)
goto fail;
p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
p = xdr_encode_array(p, name, namlen); /* name length & name */
nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
switch (nfserr) {
case nfs_ok:
break;
case nfserr_resource:
nfserr = nfserr_toosmall;
goto fail;
case nfserr_noent:
xdr_truncate_encode(xdr, start_offset);
goto skip_entry;
default:
/*
* If the client requested the RDATTR_ERROR attribute,
* we stuff the error code into this attribute
* and continue. If this attribute was not requested,
* then in accordance with the spec, we fail the
* entire READDIR operation(!)
*/
if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
goto fail;
p = nfsd4_encode_rdattr_error(xdr, nfserr);
if (p == NULL) {
nfserr = nfserr_toosmall;
goto fail;
}
}
nfserr = nfserr_toosmall;
entry_bytes = xdr->buf->len - start_offset;
if (entry_bytes > cd->rd_maxcount)
goto fail;
cd->rd_maxcount -= entry_bytes;
/*
* RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
* let's always let through the first entry, at least:
*/
if (!cd->rd_dircount)
goto fail;
name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
goto fail;
cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
cd->cookie_offset = cookie_offset;
skip_entry:
cd->common.err = nfs_ok;
return 0;
fail:
xdr_truncate_encode(xdr, start_offset);
cd->common.err = nfserr;
return -EINVAL;
}
static __be32
nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
{
__be32 *p;
p = xdr_reserve_space(xdr, sizeof(stateid_t));
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(sid->si_generation);
p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
sizeof(stateid_opaque_t));
return 0;
}
static __be32
nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 8);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(access->ac_supported);
*p++ = cpu_to_be32(access->ac_resp_access);
return 0;
}
static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
NFS4_MAX_SESSIONID_LEN);
*p++ = cpu_to_be32(bcts->dir);
/* Upshifting from TCP to RDMA is not supported */
*p++ = cpu_to_be32(0);
return 0;
}
static __be32
nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
{
struct xdr_stream *xdr = &resp->xdr;
return nfsd4_encode_stateid(xdr, &close->cl_stateid);
}
static __be32
nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
NFS4_VERIFIER_SIZE);
return 0;
}
static __be32
nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 20);
if (!p)
return nfserr_resource;
encode_cinfo(p, &create->cr_cinfo);
return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
create->cr_bmval[1], create->cr_bmval[2]);
}
static __be32
nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
{
struct svc_fh *fhp = getattr->ga_fhp;
struct xdr_stream *xdr = &resp->xdr;
return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
getattr->ga_bmval, resp->rqstp, 0);
}
static __be32
nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
{
struct xdr_stream *xdr = &resp->xdr;
struct svc_fh *fhp = *fhpp;
unsigned int len;
__be32 *p;
len = fhp->fh_handle.fh_size;
p = xdr_reserve_space(xdr, len + 4);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
return 0;
}
/*
* Including all fields other than the name, a LOCK4denied structure requires
* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
*/
static __be32
nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
{
struct xdr_netobj *conf = &ld->ld_owner;
__be32 *p;
again:
p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
if (!p) {
/*
* Don't fail to return the result just because we can't
* return the conflicting open:
*/
if (conf->len) {
kfree(conf->data);
conf->len = 0;
conf->data = NULL;
goto again;
}
return nfserr_resource;
}
p = xdr_encode_hyper(p, ld->ld_start);
p = xdr_encode_hyper(p, ld->ld_length);
*p++ = cpu_to_be32(ld->ld_type);
if (conf->len) {
p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
p = xdr_encode_opaque(p, conf->data, conf->len);
kfree(conf->data);
} else { /* non - nfsv4 lock in conflict, no clientid nor owner */
p = xdr_encode_hyper(p, (u64)0); /* clientid */
*p++ = cpu_to_be32(0); /* length of owner name */
}
return nfserr_denied;
}
static __be32
nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
{
struct xdr_stream *xdr = &resp->xdr;
if (!nfserr)
nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
else if (nfserr == nfserr_denied)
nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
return nfserr;
}
static __be32
nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
{
struct xdr_stream *xdr = &resp->xdr;
if (nfserr == nfserr_denied)
nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
return nfserr;
}
static __be32
nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
{
struct xdr_stream *xdr = &resp->xdr;
return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
}
static __be32
nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 20);
if (!p)
return nfserr_resource;
p = encode_cinfo(p, &link->li_cinfo);
return 0;
}
static __be32
nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
if (nfserr)
return nfserr;
p = xdr_reserve_space(xdr, 24);
if (!p)
return nfserr_resource;
p = encode_cinfo(p, &open->op_cinfo);
*p++ = cpu_to_be32(open->op_rflags);
nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
open->op_bmval[2]);
if (nfserr)
return nfserr;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(open->op_delegate_type);
switch (open->op_delegate_type) {
case NFS4_OPEN_DELEGATE_NONE:
break;
case NFS4_OPEN_DELEGATE_READ:
nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
if (nfserr)
return nfserr;
p = xdr_reserve_space(xdr, 20);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(open->op_recall);
/*
* TODO: ACE's in delegations
*/
*p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
break;
case NFS4_OPEN_DELEGATE_WRITE:
nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
if (nfserr)
return nfserr;
p = xdr_reserve_space(xdr, 32);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(0);
/*
* TODO: space_limit's in delegations
*/
*p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
*p++ = cpu_to_be32(~(u32)0);
*p++ = cpu_to_be32(~(u32)0);
/*
* TODO: ACE's in delegations
*/
*p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
break;
case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
switch (open->op_why_no_deleg) {
case WND4_CONTENTION:
case WND4_RESOURCE:
p = xdr_reserve_space(xdr, 8);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(open->op_why_no_deleg);
/* deleg signaling not supported yet: */
*p++ = cpu_to_be32(0);
break;
default:
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(open->op_why_no_deleg);
}
break;
default:
BUG();
}
/* XXX save filehandle here */
return 0;
}
static __be32
nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
{
struct xdr_stream *xdr = &resp->xdr;
return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
}
static __be32
nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
{
struct xdr_stream *xdr = &resp->xdr;
return nfsd4_encode_stateid(xdr, &od->od_stateid);
}
static __be32 nfsd4_encode_splice_read(
struct nfsd4_compoundres *resp,
struct nfsd4_read *read,
struct file *file, unsigned long maxcount)
{
struct xdr_stream *xdr = &resp->xdr;
struct xdr_buf *buf = xdr->buf;
u32 eof;
long len;
int space_left;
__be32 nfserr;
__be32 *p = xdr->p - 2;
/* Make sure there will be room for padding if needed */
if (xdr->end - xdr->p < 1)
return nfserr_resource;
len = maxcount;
nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
file, read->rd_offset, &maxcount, &eof);
read->rd_length = maxcount;
if (nfserr) {
/*
* nfsd_splice_actor may have already messed with the
* page length; reset it so as not to confuse
* xdr_truncate_encode:
*/
buf->page_len = 0;
return nfserr;
}
*(p++) = htonl(eof);
*(p++) = htonl(maxcount);
buf->page_len = maxcount;
buf->len += maxcount;
xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
/ PAGE_SIZE;
/* Use rest of head for padding and remaining ops: */
buf->tail[0].iov_base = xdr->p;
buf->tail[0].iov_len = 0;
xdr->iov = buf->tail;
if (maxcount&3) {
int pad = 4 - (maxcount&3);
*(xdr->p++) = 0;
buf->tail[0].iov_base += maxcount&3;
buf->tail[0].iov_len = pad;
buf->len += pad;
}
space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
buf->buflen - buf->len);
buf->buflen = buf->len + space_left;
xdr->end = (__be32 *)((void *)xdr->end + space_left);
return 0;
}
static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
struct nfsd4_read *read,
struct file *file, unsigned long maxcount)
{
struct xdr_stream *xdr = &resp->xdr;
u32 eof;
int v;
int starting_len = xdr->buf->len - 8;
long len;
int thislen;
__be32 nfserr;
__be32 tmp;
__be32 *p;
u32 zzz = 0;
int pad;
len = maxcount;
v = 0;
thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
p = xdr_reserve_space(xdr, (thislen+3)&~3);
WARN_ON_ONCE(!p);
resp->rqstp->rq_vec[v].iov_base = p;
resp->rqstp->rq_vec[v].iov_len = thislen;
v++;
len -= thislen;
while (len) {
thislen = min_t(long, len, PAGE_SIZE);
p = xdr_reserve_space(xdr, (thislen+3)&~3);
WARN_ON_ONCE(!p);
resp->rqstp->rq_vec[v].iov_base = p;
resp->rqstp->rq_vec[v].iov_len = thislen;
v++;
len -= thislen;
}
read->rd_vlen = v;
len = maxcount;
nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
&eof);
read->rd_length = maxcount;
if (nfserr)
return nfserr;
xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
tmp = htonl(eof);
write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
tmp = htonl(maxcount);
write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
&zzz, pad);
return 0;
}
static __be32
nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_read *read)
{
unsigned long maxcount;
struct xdr_stream *xdr = &resp->xdr;
struct file *file;
int starting_len = xdr->buf->len;
__be32 *p;
if (nfserr)
return nfserr;
file = read->rd_nf->nf_file;
p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
if (!p) {
WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
return nfserr_resource;
}
if (resp->xdr.buf->page_len &&
test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
WARN_ON_ONCE(1);
return nfserr_resource;
}
xdr_commit_encode(xdr);
maxcount = svc_max_payload(resp->rqstp);
maxcount = min_t(unsigned long, maxcount,
(xdr->buf->buflen - xdr->buf->len));
maxcount = min_t(unsigned long, maxcount, read->rd_length);
if (file->f_op->splice_read &&
test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
else
nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
if (nfserr)
xdr_truncate_encode(xdr, starting_len);
return nfserr;
}
static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
{
int maxcount;
__be32 wire_count;
int zero = 0;
struct xdr_stream *xdr = &resp->xdr;
int length_offset = xdr->buf->len;
__be32 *p;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
maxcount = PAGE_SIZE;
p = xdr_reserve_space(xdr, maxcount);
if (!p)
return nfserr_resource;
/*
* XXX: By default, vfs_readlink() will truncate symlinks if they
* would overflow the buffer. Is this kosher in NFSv4? If not, one
* easy fix is: if vfs_readlink() precisely fills the buffer, assume
* that truncation occurred, and return NFS4ERR_RESOURCE.
*/
nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
(char *)p, &maxcount);
if (nfserr == nfserr_isdir)
nfserr = nfserr_inval;
if (nfserr) {
xdr_truncate_encode(xdr, length_offset);
return nfserr;
}
wire_count = htonl(maxcount);
write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
if (maxcount & 3)
write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
&zero, 4 - (maxcount&3));
return 0;
}
static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
{
int maxcount;
int bytes_left;
loff_t offset;
__be64 wire_offset;
struct xdr_stream *xdr = &resp->xdr;
int starting_len = xdr->buf->len;
__be32 *p;
p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
if (!p)
return nfserr_resource;
/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0);
resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
- (char *)resp->xdr.buf->head[0].iov_base;
/*
* Number of bytes left for directory entries allowing for the
* final 8 bytes of the readdir and a following failed op:
*/
bytes_left = xdr->buf->buflen - xdr->buf->len
- COMPOUND_ERR_SLACK_SPACE - 8;
if (bytes_left < 0) {
nfserr = nfserr_resource;
goto err_no_verf;
}
maxcount = svc_max_payload(resp->rqstp);
maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
/*
* Note the rfc defines rd_maxcount as the size of the
* READDIR4resok structure, which includes the verifier above
* and the 8 bytes encoded at the end of this function:
*/
if (maxcount < 16) {
nfserr = nfserr_toosmall;
goto err_no_verf;
}
maxcount = min_t(int, maxcount-16, bytes_left);
/* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
if (!readdir->rd_dircount)
readdir->rd_dircount = svc_max_payload(resp->rqstp);
readdir->xdr = xdr;
readdir->rd_maxcount = maxcount;
readdir->common.err = 0;
readdir->cookie_offset = 0;
offset = readdir->rd_cookie;
nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
&offset,
&readdir->common, nfsd4_encode_dirent);
if (nfserr == nfs_ok &&
readdir->common.err == nfserr_toosmall &&
xdr->buf->len == starting_len + 8) {
/* nothing encoded; which limit did we hit?: */
if (maxcount - 16 < bytes_left)
/* It was the fault of rd_maxcount: */
nfserr = nfserr_toosmall;
else
/* We ran out of buffer space: */
nfserr = nfserr_resource;
}
if (nfserr)
goto err_no_verf;
if (readdir->cookie_offset) {
wire_offset = cpu_to_be64(offset);
write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
&wire_offset, 8);
}
p = xdr_reserve_space(xdr, 8);
if (!p) {
WARN_ON_ONCE(1);
goto err_no_verf;
}
*p++ = 0; /* no more entries */
*p++ = htonl(readdir->common.err == nfserr_eof);
return 0;
err_no_verf:
xdr_truncate_encode(xdr, starting_len);
return nfserr;
}
static __be32
nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 20);
if (!p)
return nfserr_resource;
p = encode_cinfo(p, &remove->rm_cinfo);
return 0;
}
static __be32
nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 40);
if (!p)
return nfserr_resource;
p = encode_cinfo(p, &rename->rn_sinfo);
p = encode_cinfo(p, &rename->rn_tinfo);
return 0;
}
static __be32
nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
{
u32 i, nflavs, supported;
struct exp_flavor_info *flavs;
struct exp_flavor_info def_flavs[2];
__be32 *p, *flavorsp;
static bool report = true;
if (exp->ex_nflavors) {
flavs = exp->ex_flavors;
nflavs = exp->ex_nflavors;
} else { /* Handling of some defaults in absence of real secinfo: */
flavs = def_flavs;
if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
nflavs = 2;
flavs[0].pseudoflavor = RPC_AUTH_UNIX;
flavs[1].pseudoflavor = RPC_AUTH_NULL;
} else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
nflavs = 1;
flavs[0].pseudoflavor
= svcauth_gss_flavor(exp->ex_client);
} else {
nflavs = 1;
flavs[0].pseudoflavor
= exp->ex_client->flavour->flavour;
}
}
supported = 0;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
flavorsp = p++; /* to be backfilled later */
for (i = 0; i < nflavs; i++) {
rpc_authflavor_t pf = flavs[i].pseudoflavor;
struct rpcsec_gss_info info;
if (rpcauth_get_gssinfo(pf, &info) == 0) {
supported++;
p = xdr_reserve_space(xdr, 4 + 4 +
XDR_LEN(info.oid.len) + 4 + 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(RPC_AUTH_GSS);
p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
*p++ = cpu_to_be32(info.qop);
*p++ = cpu_to_be32(info.service);
} else if (pf < RPC_AUTH_MAXFLAVOR) {
supported++;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(pf);
} else {
if (report)
pr_warn("NFS: SECINFO: security flavor %u "
"is not supported\n", pf);
}
}
if (nflavs != supported)
report = false;
*flavorsp = htonl(supported);
return 0;
}
static __be32
nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_secinfo *secinfo)
{
struct xdr_stream *xdr = &resp->xdr;
return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
}
static __be32
nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_secinfo_no_name *secinfo)
{
struct xdr_stream *xdr = &resp->xdr;
return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
}
/*
* The SETATTR encode routine is special -- it always encodes a bitmap,
* regardless of the error status.
*/
static __be32
nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 16);
if (!p)
return nfserr_resource;
if (nfserr) {
*p++ = cpu_to_be32(3);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0);
}
else {
*p++ = cpu_to_be32(3);
*p++ = cpu_to_be32(setattr->sa_bmval[0]);
*p++ = cpu_to_be32(setattr->sa_bmval[1]);
*p++ = cpu_to_be32(setattr->sa_bmval[2]);
}
return nfserr;
}
static __be32
nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
if (!nfserr) {
p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
NFS4_VERIFIER_SIZE);
}
else if (nfserr == nfserr_clid_inuse) {
p = xdr_reserve_space(xdr, 8);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0);
}
return nfserr;
}
static __be32
nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 16);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(write->wr_bytes_written);
*p++ = cpu_to_be32(write->wr_how_written);
p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
NFS4_VERIFIER_SIZE);
return 0;
}
static __be32
nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_exchange_id *exid)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
char *major_id;
char *server_scope;
int major_id_sz;
int server_scope_sz;
uint64_t minor_id = 0;
major_id = utsname()->nodename;
major_id_sz = strlen(major_id);
server_scope = utsname()->nodename;
server_scope_sz = strlen(server_scope);
p = xdr_reserve_space(xdr,
8 /* eir_clientid */ +
4 /* eir_sequenceid */ +
4 /* eir_flags */ +
4 /* spr_how */);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
*p++ = cpu_to_be32(exid->seqid);
*p++ = cpu_to_be32(exid->flags);
*p++ = cpu_to_be32(exid->spa_how);
switch (exid->spa_how) {
case SP4_NONE:
break;
case SP4_MACH_CRED:
/* spo_must_enforce bitmap: */
nfserr = nfsd4_encode_bitmap(xdr,
exid->spo_must_enforce[0],
exid->spo_must_enforce[1],
exid->spo_must_enforce[2]);
if (nfserr)
return nfserr;
/* spo_must_allow bitmap: */
nfserr = nfsd4_encode_bitmap(xdr,
exid->spo_must_allow[0],
exid->spo_must_allow[1],
exid->spo_must_allow[2]);
if (nfserr)
return nfserr;
break;
default:
WARN_ON_ONCE(1);
}
p = xdr_reserve_space(xdr,
8 /* so_minor_id */ +
4 /* so_major_id.len */ +
(XDR_QUADLEN(major_id_sz) * 4) +
4 /* eir_server_scope.len */ +
(XDR_QUADLEN(server_scope_sz) * 4) +
4 /* eir_server_impl_id.count (0) */);
if (!p)
return nfserr_resource;
/* The server_owner struct */
p = xdr_encode_hyper(p, minor_id); /* Minor id */
/* major id */
p = xdr_encode_opaque(p, major_id, major_id_sz);
/* Server scope */
p = xdr_encode_opaque(p, server_scope, server_scope_sz);
/* Implementation id */
*p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
return 0;
}
static __be32
nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_create_session *sess)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 24);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
NFS4_MAX_SESSIONID_LEN);
*p++ = cpu_to_be32(sess->seqid);
*p++ = cpu_to_be32(sess->flags);
p = xdr_reserve_space(xdr, 28);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(0); /* headerpadsz */
*p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
*p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
*p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
*p++ = cpu_to_be32(sess->fore_channel.maxops);
*p++ = cpu_to_be32(sess->fore_channel.maxreqs);
*p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
if (sess->fore_channel.nr_rdma_attrs) {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
}
p = xdr_reserve_space(xdr, 28);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(0); /* headerpadsz */
*p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
*p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
*p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
*p++ = cpu_to_be32(sess->back_channel.maxops);
*p++ = cpu_to_be32(sess->back_channel.maxreqs);
*p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
if (sess->back_channel.nr_rdma_attrs) {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
}
return 0;
}
static __be32
nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_sequence *seq)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
NFS4_MAX_SESSIONID_LEN);
*p++ = cpu_to_be32(seq->seqid);
*p++ = cpu_to_be32(seq->slotid);
/* Note slotid's are numbered from zero: */
*p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
*p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
*p++ = cpu_to_be32(seq->status_flags);
resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
return 0;
}
static __be32
nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_test_stateid *test_stateid)
{
struct xdr_stream *xdr = &resp->xdr;
struct nfsd4_test_stateid_id *stateid, *next;
__be32 *p;
p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
if (!p)
return nfserr_resource;
*p++ = htonl(test_stateid->ts_num_ids);
list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
*p++ = stateid->ts_id_status;
}
return 0;
}
#ifdef CONFIG_NFSD_PNFS
static __be32
nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_getdeviceinfo *gdev)
{
struct xdr_stream *xdr = &resp->xdr;
const struct nfsd4_layout_ops *ops;
u32 starting_len = xdr->buf->len, needed_len;
__be32 *p;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(gdev->gd_layout_type);
/* If maxcount is 0 then just update notifications */
if (gdev->gd_maxcount != 0) {
ops = nfsd4_layout_ops[gdev->gd_layout_type];
nfserr = ops->encode_getdeviceinfo(xdr, gdev);
if (nfserr) {
/*
* We don't bother to burden the layout drivers with
* enforcing gd_maxcount, just tell the client to
* come back with a bigger buffer if it's not enough.
*/
if (xdr->buf->len + 4 > gdev->gd_maxcount)
goto toosmall;
return nfserr;
}
}
if (gdev->gd_notify_types) {
p = xdr_reserve_space(xdr, 4 + 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(1); /* bitmap length */
*p++ = cpu_to_be32(gdev->gd_notify_types);
} else {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = 0;
}
return 0;
toosmall:
dprintk("%s: maxcount too small\n", __func__);
needed_len = xdr->buf->len + 4 /* notifications */;
xdr_truncate_encode(xdr, starting_len);
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(needed_len);
return nfserr_toosmall;
}
static __be32
nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_layoutget *lgp)
{
struct xdr_stream *xdr = &resp->xdr;
const struct nfsd4_layout_ops *ops;
__be32 *p;
p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(1); /* we always set return-on-close */
*p++ = cpu_to_be32(lgp->lg_sid.si_generation);
p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
sizeof(stateid_opaque_t));
*p++ = cpu_to_be32(1); /* we always return a single layout */
p = xdr_encode_hyper(p, lgp->lg_seg.offset);
p = xdr_encode_hyper(p, lgp->lg_seg.length);
*p++ = cpu_to_be32(lgp->lg_seg.iomode);
*p++ = cpu_to_be32(lgp->lg_layout_type);
ops = nfsd4_layout_ops[lgp->lg_layout_type];
return ops->encode_layoutget(xdr, lgp);
}
static __be32
nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_layoutcommit *lcp)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(lcp->lc_size_chg);
if (lcp->lc_size_chg) {
p = xdr_reserve_space(xdr, 8);
if (!p)
return nfserr_resource;
p = xdr_encode_hyper(p, lcp->lc_newsize);
}
return 0;
}
static __be32
nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_layoutreturn *lrp)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(lrp->lrs_present);
if (lrp->lrs_present)
return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
return 0;
}
#endif /* CONFIG_NFSD_PNFS */
static __be32
nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
struct nfsd42_write_res *write, bool sync)
{
__be32 *p;
p = xdr_reserve_space(&resp->xdr, 4);
if (!p)
return nfserr_resource;
if (sync)
*p++ = cpu_to_be32(0);
else {
__be32 nfserr;
*p++ = cpu_to_be32(1);
nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
if (nfserr)
return nfserr;
}
p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
if (!p)
return nfserr_resource;
p = xdr_encode_hyper(p, write->wr_bytes_written);
*p++ = cpu_to_be32(write->wr_stable_how);
p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
NFS4_VERIFIER_SIZE);
return nfs_ok;
}
static __be32
nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_copy *copy)
{
__be32 *p;
nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
copy->cp_synchronous);
if (nfserr)
return nfserr;
p = xdr_reserve_space(&resp->xdr, 4 + 4);
*p++ = xdr_one; /* cr_consecutive */
*p++ = cpu_to_be32(copy->cp_synchronous);
return 0;
}
static __be32
nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_offload_status *os)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 8 + 4);
if (!p)
return nfserr_resource;
p = xdr_encode_hyper(p, os->count);
*p++ = cpu_to_be32(0);
return nfserr;
}
static __be32
nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_seek *seek)
{
__be32 *p;
p = xdr_reserve_space(&resp->xdr, 4 + 8);
*p++ = cpu_to_be32(seek->seek_eof);
p = xdr_encode_hyper(p, seek->seek_pos);
return 0;
}
static __be32
nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
{
return nfserr;
}
typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
/*
* Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
* since we don't need to filter out obsolete ops as this is
* done in the decoding phase.
*/
static const nfsd4_enc nfsd4_enc_ops[] = {
[OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
[OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
[OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
[OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
[OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
[OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
[OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
[OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
[OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
[OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
[OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
[OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
[OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
[OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
[OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
[OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
[OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
[OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
[OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
[OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
[OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
[OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
[OP_READ] = (nfsd4_enc)nfsd4_encode_read,
[OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
[OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
[OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
[OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
[OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
[OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
[OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
[OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
[OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
[OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
[OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
[OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
[OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
[OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
/* NFSv4.1 operations */
[OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
[OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
[OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
[OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
[OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
[OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
[OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
#ifdef CONFIG_NFSD_PNFS
[OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
[OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
[OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
[OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
[OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
#else
[OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
[OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
[OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
[OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
[OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
#endif
[OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
[OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
[OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
[OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
[OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
[OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
[OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
/* NFSv4.2 operations */
[OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
[OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
[OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
[OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
[OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
[OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
[OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
[OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
[OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_offload_status,
[OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
[OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
[OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
[OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
};
/*
* Calculate whether we still have space to encode repsize bytes.
* There are two considerations:
* - For NFS versions >=4.1, the size of the reply must stay within
* session limits
* - For all NFS versions, we must stay within limited preallocated
* buffer space.
*
* This is called before the operation is processed, so can only provide
* an upper estimate. For some nonidempotent operations (such as
* getattr), it's not necessarily a problem if that estimate is wrong,
* as we can fail it after processing without significant side effects.
*/
__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
{
struct xdr_buf *buf = &resp->rqstp->rq_res;
struct nfsd4_slot *slot = resp->cstate.slot;
if (buf->len + respsize <= buf->buflen)
return nfs_ok;
if (!nfsd4_has_session(&resp->cstate))
return nfserr_resource;
if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
WARN_ON_ONCE(1);
return nfserr_rep_too_big_to_cache;
}
return nfserr_rep_too_big;
}
void
nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
struct xdr_stream *xdr = &resp->xdr;
struct nfs4_stateowner *so = resp->cstate.replay_owner;
struct svc_rqst *rqstp = resp->rqstp;
const struct nfsd4_operation *opdesc = op->opdesc;
int post_err_offset;
nfsd4_enc encoder;
__be32 *p;
p = xdr_reserve_space(xdr, 8);
if (!p) {
WARN_ON_ONCE(1);
return;
}
*p++ = cpu_to_be32(op->opnum);
post_err_offset = xdr->buf->len;
if (op->opnum == OP_ILLEGAL)
goto status;
if (op->status && opdesc &&
!(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
goto status;
BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
!nfsd4_enc_ops[op->opnum]);
encoder = nfsd4_enc_ops[op->opnum];
op->status = encoder(resp, op->status, &op->u);
if (opdesc && opdesc->op_release)
opdesc->op_release(&op->u);
xdr_commit_encode(xdr);
/* nfsd4_check_resp_size guarantees enough room for error status */
if (!op->status) {
int space_needed = 0;
if (!nfsd4_last_compound_op(rqstp))
space_needed = COMPOUND_ERR_SLACK_SPACE;
op->status = nfsd4_check_resp_size(resp, space_needed);
}
if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
struct nfsd4_slot *slot = resp->cstate.slot;
if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
op->status = nfserr_rep_too_big_to_cache;
else
op->status = nfserr_rep_too_big;
}
if (op->status == nfserr_resource ||
op->status == nfserr_rep_too_big ||
op->status == nfserr_rep_too_big_to_cache) {
/*
* The operation may have already been encoded or
* partially encoded. No op returns anything additional
* in the case of one of these three errors, so we can
* just truncate back to after the status. But it's a
* bug if we had to do this on a non-idempotent op:
*/
warn_on_nonidempotent_op(op);
xdr_truncate_encode(xdr, post_err_offset);
}
if (so) {
int len = xdr->buf->len - post_err_offset;
so->so_replay.rp_status = op->status;
so->so_replay.rp_buflen = len;
read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
so->so_replay.rp_buf, len);
}
status:
/* Note that op->status is already in network byte order: */
write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
}
/*
* Encode the reply stored in the stateowner reply cache
*
* XDR note: do not encode rp->rp_buflen: the buffer contains the
* previously sent already encoded operation.
*/
void
nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
{
__be32 *p;
struct nfs4_replay *rp = op->replay;
BUG_ON(!rp);
p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
if (!p) {
WARN_ON_ONCE(1);
return;
}
*p++ = cpu_to_be32(op->opnum);
*p++ = rp->rp_status; /* already xdr'ed */
p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
}
int
nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
{
return xdr_ressize_check(rqstp, p);
}
void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
{
struct nfsd4_compoundargs *args = rqstp->rq_argp;
if (args->ops != args->iops) {
kfree(args->ops);
args->ops = args->iops;
}
kfree(args->tmpp);
args->tmpp = NULL;
while (args->to_free) {
struct svcxdr_tmpbuf *tb = args->to_free;
args->to_free = tb->next;
kfree(tb);
}
}
int
nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
{
struct nfsd4_compoundargs *args = rqstp->rq_argp;
if (rqstp->rq_arg.head[0].iov_len % 4) {
/* client is nuts */
dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
__func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
return 0;
}
args->p = p;
args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
args->pagelist = rqstp->rq_arg.pages;
args->pagelen = rqstp->rq_arg.page_len;
args->tail = false;
args->tmpp = NULL;
args->to_free = NULL;
args->ops = args->iops;
args->rqstp = rqstp;
return !nfsd4_decode_compound(args);
}
int
nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
{
/*
* All that remains is to write the tag and operation count...
*/
struct nfsd4_compoundres *resp = rqstp->rq_resp;
struct xdr_buf *buf = resp->xdr.buf;
WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
buf->tail[0].iov_len);
rqstp->rq_next_page = resp->xdr.page_ptr + 1;
p = resp->tagp;
*p++ = htonl(resp->taglen);
memcpy(p, resp->tag, resp->taglen);
p += XDR_QUADLEN(resp->taglen);
*p++ = htonl(resp->opcnt);
nfsd4_sequence_done(resp);
return 1;
}
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
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