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linux_dsm_epyc7002/fs/nfsd/nfs4xdr.c
J. Bruce Fields d0a381dd0e nfsd4: teach encoders to handle reserve_space failures 
We've tried to prevent running out of space with COMPOUND_SLACK_SPACE
and special checking in those operations (getattr) whose result can vary
enormously.

However:
	- COMPOUND_SLACK_SPACE may be difficult to maintain as we add
	  more protocol.
	- BUG_ON or page faulting on failure seems overly fragile.
	- Especially in the 4.1 case, we prefer not to fail compounds
	  just because the returned result came *close* to session
	  limits.  (Though perfect enforcement here may be difficult.)
	- I'd prefer encoding to be uniform for all encoders instead of
	  having special exceptions for encoders containing, for
	  example, attributes.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2014-05-30 17:31:49 -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.
*
* TODO: Neil Brown made the following observation: We currently
* initially reserve NFSD_BUFSIZE space on the transmit queue and
* never release any of that until the request is complete.
* It would be good to calculate a new maximum response size while
* decoding the COMPOUND, and call svc_reserve with this number
* at the end of nfs4svc_decode_compoundargs.
*/
#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"
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
#include <linux/security.h>
#endif
#define NFSDDBG_FACILITY NFSDDBG_XDR
/*
* 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 READ32(x) (x) = ntohl(*p++)
#define READ64(x) do { \
(x) = (u64)ntohl(*p++) << 32; \
(x) |= ntohl(*p++); \
} while (0)
#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 + (argp->pagelen>>2);
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 (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 int zero_clientid(clientid_t *clid)
{
return (clid->cl_boot == 0) && (clid->cl_id == 0);
}
/**
* defer_free - mark an allocation as deferred freed
* @argp: NFSv4 compound argument structure to be freed with
* @release: release callback to free @p, typically kfree()
* @p: pointer to be freed
*
* Marks @p to be freed when processing the compound operation
* described in @argp finishes.
*/
static int
defer_free(struct nfsd4_compoundargs *argp,
void (*release)(const void *), void *p)
{
struct tmpbuf *tb;
tb = kmalloc(sizeof(*tb), GFP_KERNEL);
if (!tb)
return -ENOMEM;
tb->buf = p;
tb->release = release;
tb->next = argp->to_free;
argp->to_free = tb;
return 0;
}
/**
* 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)
{
if (p == argp->tmp) {
p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
if (!p)
return NULL;
} else {
BUG_ON(p != argp->tmpp);
argp->tmpp = NULL;
}
if (defer_free(argp, kfree, p)) {
kfree(p);
return NULL;
} else
return (char *)p;
}
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);
READ32(bmlen);
if (bmlen > 1000)
goto xdr_error;
READ_BUF(bmlen << 2);
if (bmlen > 0)
READ32(bmval[0]);
if (bmlen > 1)
READ32(bmval[1]);
if (bmlen > 2)
READ32(bmval[2]);
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 expected_len, len = 0;
u32 dummy32;
char *buf;
DECODE_HEAD;
iattr->ia_valid = 0;
if ((status = nfsd4_decode_bitmap(argp, bmval)))
return status;
READ_BUF(4);
READ32(expected_len);
if (bmval[0] & FATTR4_WORD0_SIZE) {
READ_BUF(8);
len += 8;
READ64(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;
READ32(nace);
if (nace > NFS4_ACL_MAX)
return nfserr_fbig;
*acl = nfs4_acl_new(nace);
if (*acl == NULL)
return nfserr_jukebox;
defer_free(argp, kfree, *acl);
(*acl)->naces = nace;
for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
READ_BUF(16); len += 16;
READ32(ace->type);
READ32(ace->flag);
READ32(ace->access_mask);
READ32(dummy32);
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;
READ32(iattr->ia_mode);
iattr->ia_mode &= (S_IFMT | S_IALLUGO);
iattr->ia_valid |= ATTR_MODE;
}
if (bmval[1] & FATTR4_WORD1_OWNER) {
READ_BUF(4);
len += 4;
READ32(dummy32);
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;
READ32(dummy32);
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;
READ32(dummy32);
switch (dummy32) {
case NFS4_SET_TO_CLIENT_TIME:
/* We require the high 32 bits of 'seconds' to be 0, and we ignore
all 32 bits of 'nseconds'. */
READ_BUF(12);
len += 12;
READ64(iattr->ia_atime.tv_sec);
READ32(iattr->ia_atime.tv_nsec);
if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
return nfserr_inval;
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;
READ32(dummy32);
switch (dummy32) {
case NFS4_SET_TO_CLIENT_TIME:
/* We require the high 32 bits of 'seconds' to be 0, and we ignore
all 32 bits of 'nseconds'. */
READ_BUF(12);
len += 12;
READ64(iattr->ia_mtime.tv_sec);
READ32(iattr->ia_mtime.tv_nsec);
if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
return nfserr_inval;
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;
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
READ_BUF(4);
len += 4;
READ32(dummy32); /* lfs: we don't use it */
READ_BUF(4);
len += 4;
READ32(dummy32); /* pi: we don't use it either */
READ_BUF(4);
len += 4;
READ32(dummy32);
READ_BUF(dummy32);
if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
return nfserr_badlabel;
len += (XDR_QUADLEN(dummy32) << 2);
READMEM(buf, dummy32);
label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
if (!label->data)
return nfserr_jukebox;
label->len = dummy32;
defer_free(argp, kfree, label->data);
memcpy(label->data, buf, dummy32);
}
#endif
if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
|| bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
|| bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
READ_BUF(expected_len - len);
else 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));
READ32(sid->si_generation);
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);
READ32(access->ac_req_access);
DECODE_TAIL;
}
static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
{
DECODE_HEAD;
u32 dummy, uid, gid;
char *machine_name;
int i;
int nr_secflavs;
/* callback_sec_params4 */
READ_BUF(4);
READ32(nr_secflavs);
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);
READ32(dummy);
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 */
READ32(dummy);
/* machine name */
READ32(dummy);
READ_BUF(dummy);
SAVEMEM(machine_name, dummy);
/* uid, gid */
READ_BUF(8);
READ32(uid);
READ32(gid);
/* more gids */
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy * 4);
if (cbs->flavor == (u32)(-1)) {
kuid_t kuid = make_kuid(&init_user_ns, uid);
kgid_t kgid = make_kgid(&init_user_ns, 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 */
READ32(dummy);
/* gcbp_handle_from_server */
READ32(dummy);
READ_BUF(dummy);
p += XDR_QUADLEN(dummy);
/* gcbp_handle_from_client */
READ_BUF(4);
READ32(dummy);
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);
READ32(bc->bc_cb_program);
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);
READ32(bcts->dir);
/* 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);
READ32(close->cl_seqid);
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);
READ64(commit->co_offset);
READ32(commit->co_count);
DECODE_TAIL;
}
static __be32
nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
{
DECODE_HEAD;
READ_BUF(4);
READ32(create->cr_type);
switch (create->cr_type) {
case NF4LNK:
READ_BUF(4);
READ32(create->cr_linklen);
READ_BUF(create->cr_linklen);
SAVEMEM(create->cr_linkname, create->cr_linklen);
break;
case NF4BLK:
case NF4CHR:
READ_BUF(8);
READ32(create->cr_specdata1);
READ32(create->cr_specdata2);
break;
case NF4SOCK:
case NF4FIFO:
case NF4DIR:
default:
break;
}
READ_BUF(4);
READ32(create->cr_namelen);
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);
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);
READ32(link->li_namelen);
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);
READ32(lock->lk_type);
if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
goto xdr_error;
READ32(lock->lk_reclaim);
READ64(lock->lk_offset);
READ64(lock->lk_length);
READ32(lock->lk_is_new);
if (lock->lk_is_new) {
READ_BUF(4);
READ32(lock->lk_new_open_seqid);
status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
if (status)
return status;
READ_BUF(8 + sizeof(clientid_t));
READ32(lock->lk_new_lock_seqid);
COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
READ32(lock->lk_new_owner.len);
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);
READ32(lock->lk_old_lock_seqid);
}
DECODE_TAIL;
}
static __be32
nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
{
DECODE_HEAD;
READ_BUF(32);
READ32(lockt->lt_type);
if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
goto xdr_error;
READ64(lockt->lt_offset);
READ64(lockt->lt_length);
COPYMEM(&lockt->lt_clientid, 8);
READ32(lockt->lt_owner.len);
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);
READ32(locku->lu_type);
if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
goto xdr_error;
READ32(locku->lu_seqid);
status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
if (status)
return status;
READ_BUF(16);
READ64(locku->lu_offset);
READ64(locku->lu_length);
DECODE_TAIL;
}
static __be32
nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
{
DECODE_HEAD;
READ_BUF(4);
READ32(lookup->lo_len);
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);
READ32(w);
*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);
READ32(*x);
/* 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);
READ32(o->len);
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);
READ32(open->op_seqid);
/* 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);
READ32(open->op_create);
switch (open->op_create) {
case NFS4_OPEN_NOCREATE:
break;
case NFS4_OPEN_CREATE:
READ_BUF(4);
READ32(open->op_createmode);
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);
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);
if (status)
goto out;
break;
default:
goto xdr_error;
}
break;
default:
goto xdr_error;
}
/* open_claim */
READ_BUF(4);
READ32(open->op_claim_type);
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
READ_BUF(4);
READ32(open->op_fname.len);
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);
READ32(open->op_delegate_type);
break;
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
if (status)
return status;
READ_BUF(4);
READ32(open->op_fname.len);
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);
READ32(open_conf->oc_seqid);
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);
READ32(open_down->od_seqid);
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);
READ32(putfh->pf_fhlen);
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);
READ64(read->rd_offset);
READ32(read->rd_length);
DECODE_TAIL;
}
static __be32
nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
{
DECODE_HEAD;
READ_BUF(24);
READ64(readdir->rd_cookie);
COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
READ32(readdir->rd_maxcount);
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);
READ32(remove->rm_namelen);
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);
READ32(rename->rn_snamelen);
READ_BUF(rename->rn_snamelen + 4);
SAVEMEM(rename->rn_sname, rename->rn_snamelen);
READ32(rename->rn_tnamelen);
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);
READ32(secinfo->si_namelen);
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);
READ32(sin->sin_style);
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);
}
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);
READ32(setclientid->se_callback_prog);
READ32(setclientid->se_callback_netid_len);
READ_BUF(setclientid->se_callback_netid_len + 4);
SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
READ32(setclientid->se_callback_addr_len);
READ_BUF(setclientid->se_callback_addr_len + 4);
SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
READ32(setclientid->se_callback_ident);
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);
READ32(verify->ve_attrlen);
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);
READ64(write->wr_offset);
READ32(write->wr_stable_how);
if (write->wr_stable_how > 2)
goto xdr_error;
READ32(write->wr_buflen);
/* 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;
argp->p = (__be32 *)page_address(argp->pagelist[0]);
argp->pagelist++;
argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
}
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));
READ32(rlockowner->rl_owner.len);
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);
READ32(exid->flags);
/* Ignore state_protect4_a */
READ_BUF(4);
READ32(exid->spa_how);
switch (exid->spa_how) {
case SP4_NONE:
break;
case SP4_MACH_CRED:
/* spo_must_enforce */
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy * 4);
p += dummy;
/* spo_must_allow */
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy * 4);
p += dummy;
break;
case SP4_SSV:
/* ssp_ops */
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy * 4);
p += dummy;
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy * 4);
p += dummy;
/* ssp_hash_algs<> */
READ_BUF(4);
READ32(tmp);
while (tmp--) {
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy);
p += XDR_QUADLEN(dummy);
}
/* ssp_encr_algs<> */
READ_BUF(4);
READ32(tmp);
while (tmp--) {
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy);
p += XDR_QUADLEN(dummy);
}
/* ssp_window and ssp_num_gss_handles */
READ_BUF(8);
READ32(dummy);
READ32(dummy);
break;
default:
goto xdr_error;
}
/* Ignore Implementation ID */
READ_BUF(4); /* nfs_impl_id4 array length */
READ32(dummy);
if (dummy > 1)
goto xdr_error;
if (dummy == 1) {
/* nii_domain */
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy);
p += XDR_QUADLEN(dummy);
/* nii_name */
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy);
p += XDR_QUADLEN(dummy);
/* nii_date */
READ_BUF(12);
p += 3;
}
DECODE_TAIL;
}
static __be32
nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
struct nfsd4_create_session *sess)
{
DECODE_HEAD;
u32 dummy;
READ_BUF(16);
COPYMEM(&sess->clientid, 8);
READ32(sess->seqid);
READ32(sess->flags);
/* Fore channel attrs */
READ_BUF(28);
READ32(dummy); /* headerpadsz is always 0 */
READ32(sess->fore_channel.maxreq_sz);
READ32(sess->fore_channel.maxresp_sz);
READ32(sess->fore_channel.maxresp_cached);
READ32(sess->fore_channel.maxops);
READ32(sess->fore_channel.maxreqs);
READ32(sess->fore_channel.nr_rdma_attrs);
if (sess->fore_channel.nr_rdma_attrs == 1) {
READ_BUF(4);
READ32(sess->fore_channel.rdma_attrs);
} 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);
READ32(dummy); /* headerpadsz is always 0 */
READ32(sess->back_channel.maxreq_sz);
READ32(sess->back_channel.maxresp_sz);
READ32(sess->back_channel.maxresp_cached);
READ32(sess->back_channel.maxops);
READ32(sess->back_channel.maxreqs);
READ32(sess->back_channel.nr_rdma_attrs);
if (sess->back_channel.nr_rdma_attrs == 1) {
READ_BUF(4);
READ32(sess->back_channel.rdma_attrs);
} else if (sess->back_channel.nr_rdma_attrs > 1) {
dprintk("Too many back channel attr bitmaps!\n");
goto xdr_error;
}
READ_BUF(4);
READ32(sess->callback_prog);
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));
READ32(free_stateid->fr_stateid.si_generation);
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);
READ32(seq->seqid);
READ32(seq->slotid);
READ32(seq->maxslots);
READ32(seq->cachethis);
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 = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
if (!stateid) {
status = nfserrno(-ENOMEM);
goto out;
}
defer_free(argp, kfree, stateid);
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);
READ32(rc->rca_one_fs);
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 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,
[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,
[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,
};
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;
}
/*
* Return a rough estimate of the maximum possible reply size. Note the
* estimate includes rpc headers so is meant to be passed to
* svc_reserve, not svc_reserve_auth.
*
* Also note the current compound encoding permits only one operation to
* use pages beyond the first one, so the maximum possible length is the
* maximum over these values, not the sum.
*/
static int nfsd4_max_reply(u32 opnum)
{
switch (opnum) {
case OP_READLINK:
case OP_READDIR:
/*
* Both of these ops take a single page for data and put
* the head and tail in another page:
*/
return 2 * PAGE_SIZE;
case OP_READ:
return INT_MAX;
default:
return PAGE_SIZE;
}
}
static __be32
nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
{
DECODE_HEAD;
struct nfsd4_op *op;
bool cachethis = false;
int max_reply = PAGE_SIZE;
int i;
READ_BUF(4);
READ32(argp->taglen);
READ_BUF(argp->taglen + 8);
SAVEMEM(argp->tag, argp->taglen);
READ32(argp->minorversion);
READ32(argp->opcnt);
if (argp->taglen > NFSD4_MAX_TAGLEN)
goto xdr_error;
if (argp->opcnt > 100)
goto xdr_error;
if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
argp->ops = kmalloc(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);
READ32(op->opnum);
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;
}
/*
* 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);
max_reply = max(max_reply, nfsd4_max_reply(op->opnum));
if (op->status) {
argp->opcnt = i+1;
break;
}
}
/* Sessions make the DRC unnecessary: */
if (argp->minorversion)
cachethis = false;
if (max_reply != INT_MAX)
svc_reserve(argp->rqstp, max_reply);
argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
DECODE_TAIL;
}
#define WRITE32(n) *p++ = htonl(n)
#define WRITE64(n) do { \
*p++ = htonl((u32)((n) >> 32)); \
*p++ = htonl((u32)(n)); \
} while (0)
#define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \
*(p + XDR_QUADLEN(nbytes) -1) = 0; \
memcpy(p, ptr, nbytes); \
p += XDR_QUADLEN(nbytes); \
}} while (0)
static void write32(__be32 **p, u32 n)
{
*(*p)++ = htonl(n);
}
static void write64(__be32 **p, u64 n)
{
write32(p, (n >> 32));
write32(p, (u32)n);
}
static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
{
if (IS_I_VERSION(inode)) {
write64(p, inode->i_version);
} else {
write32(p, stat->ctime.tv_sec);
write32(p, stat->ctime.tv_nsec);
}
}
static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
{
write32(p, c->atomic);
if (c->change_supported) {
write64(p, c->before_change);
write64(p, c->after_change);
} else {
write32(p, c->before_ctime_sec);
write32(p, c->before_ctime_nsec);
write32(p, c->after_ctime_sec);
write32(p, c->after_ctime_nsec);
}
}
/* 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;
WRITE32(strlen);
WRITEMEM(str, strlen);
count++;
}
else
end++;
str = end;
}
pathlen = htonl(xdr->buf->len - pathlen_offset);
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 (cur.dentry == root->dentry && cur.mnt == root->mnt)
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;
WRITE32(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;
}
WRITE32(len);
WRITEMEM(dentry->d_name.name, len);
dprintk("/%s", dentry->d_name.name);
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;
WRITE32(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);
}
#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
#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.
*/
WRITE32(0); /* lfs */
WRITE32(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 *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;
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);
path_put(&path);
return err;
}
/*
* Note: @fhp can be NULL; in this case, we might have to compose the filehandle
* ourselves.
*/
__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;
int aclsupport = 0;
struct nfs4_acl *acl = NULL;
void *context = NULL;
int contextlen;
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(bmval0 & ~nfsd_suppattrs0(minorversion));
BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
if (exp->ex_fslocs.migrated) {
BUG_ON(bmval[2]);
status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
if (status)
goto out;
}
err = vfs_getattr(&path, &stat);
if (err)
goto out_nfserr;
if ((bmval0 & (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 | FATTR4_WORD0_ACLSUPPORT
| FATTR4_WORD0_SUPPORTED_ATTRS)) {
err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
aclsupport = (err == 0);
if (bmval0 & FATTR4_WORD0_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 ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
err = security_inode_getsecctx(dentry->d_inode,
&context, &contextlen);
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 */
if (bmval2) {
p = xdr_reserve_space(xdr, 16);
if (!p)
goto out_resource;
WRITE32(3);
WRITE32(bmval0);
WRITE32(bmval1);
WRITE32(bmval2);
} else if (bmval1) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
WRITE32(2);
WRITE32(bmval0);
WRITE32(bmval1);
} else {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
WRITE32(1);
WRITE32(bmval0);
}
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 word0 = nfsd_suppattrs0(minorversion);
u32 word1 = nfsd_suppattrs1(minorversion);
u32 word2 = nfsd_suppattrs2(minorversion);
if (!aclsupport)
word0 &= ~FATTR4_WORD0_ACL;
if (!contextsupport)
word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
if (!word2) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
WRITE32(2);
WRITE32(word0);
WRITE32(word1);
} else {
p = xdr_reserve_space(xdr, 16);
if (!p)
goto out_resource;
WRITE32(3);
WRITE32(word0);
WRITE32(word1);
WRITE32(word2);
}
}
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;
}
WRITE32(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)
WRITE32(NFS4_FH_PERSISTENT);
else
WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
}
if (bmval0 & FATTR4_WORD0_CHANGE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
write_change(&p, &stat, dentry->d_inode);
}
if (bmval0 & FATTR4_WORD0_SIZE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
WRITE64(stat.size);
}
if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(1);
}
if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(1);
}
if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(0);
}
if (bmval0 & FATTR4_WORD0_FSID) {
p = xdr_reserve_space(xdr, 16);
if (!p)
goto out_resource;
if (exp->ex_fslocs.migrated) {
WRITE64(NFS4_REFERRAL_FSID_MAJOR);
WRITE64(NFS4_REFERRAL_FSID_MINOR);
} else switch(fsid_source(fhp)) {
case FSIDSOURCE_FSID:
WRITE64((u64)exp->ex_fsid);
WRITE64((u64)0);
break;
case FSIDSOURCE_DEV:
WRITE32(0);
WRITE32(MAJOR(stat.dev));
WRITE32(0);
WRITE32(MINOR(stat.dev));
break;
case FSIDSOURCE_UUID:
WRITEMEM(exp->ex_uuid, 16);
break;
}
}
if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(0);
}
if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(nn->nfsd4_lease);
}
if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(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;
WRITE32(0);
goto out_acl;
}
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(acl->naces);
for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
p = xdr_reserve_space(xdr, 4*3);
if (!p)
goto out_resource;
WRITE32(ace->type);
WRITE32(ace->flag);
WRITE32(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;
WRITE32(aclsupport ?
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;
WRITE32(1);
}
if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(0);
}
if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(1);
}
if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(1);
}
if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
if (!p)
goto out_resource;
WRITE32(fhp->fh_handle.fh_size);
WRITEMEM(&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;
WRITE64(stat.ino);
}
if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
WRITE64((u64) statfs.f_ffree);
}
if (bmval0 & FATTR4_WORD0_FILES_FREE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
WRITE64((u64) statfs.f_ffree);
}
if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
WRITE64((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;
WRITE32(1);
}
if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
}
if (bmval0 & FATTR4_WORD0_MAXLINK) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(255);
}
if (bmval0 & FATTR4_WORD0_MAXNAME) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(statfs.f_namelen);
}
if (bmval0 & FATTR4_WORD0_MAXREAD) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
WRITE64((u64) svc_max_payload(rqstp));
}
if (bmval0 & FATTR4_WORD0_MAXWRITE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
WRITE64((u64) svc_max_payload(rqstp));
}
if (bmval1 & FATTR4_WORD1_MODE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(stat.mode & S_IALLUGO);
}
if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(1);
}
if (bmval1 & FATTR4_WORD1_NUMLINKS) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
WRITE32(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;
WRITE32((u32) MAJOR(stat.rdev));
WRITE32((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;
WRITE64(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;
WRITE64(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;
WRITE64(dummy64);
}
if (bmval1 & FATTR4_WORD1_SPACE_USED) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)stat.blocks << 9;
WRITE64(dummy64);
}
if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
WRITE64((s64)stat.atime.tv_sec);
WRITE32(stat.atime.tv_nsec);
}
if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
WRITE32(0);
WRITE32(1);
WRITE32(0);
}
if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
WRITE64((s64)stat.ctime.tv_sec);
WRITE32(stat.ctime.tv_nsec);
}
if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
WRITE64((s64)stat.mtime.tv_sec);
WRITE32(stat.mtime.tv_nsec);
}
if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
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)
get_parent_attributes(exp, &stat);
WRITE64(stat.ino);
}
if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
status = nfsd4_encode_security_label(xdr, rqstp, context,
contextlen);
if (status)
goto out;
}
if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
p = xdr_reserve_space(xdr, 16);
if (!p)
goto out_resource;
WRITE32(3);
WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
}
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;
}
__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 = {
.head[0] = {
.iov_base = *p,
},
.buflen = words << 2,
};
struct xdr_stream xdr;
__be32 ret;
xdr_init_encode(&xdr, &dummy, NULL);
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 nfsd4_readdir *cd,
const char *name, int namlen, __be32 **p, int buflen)
{
struct svc_export *exp = cd->rd_fhp->fh_export;
struct dentry *dentry;
__be32 nfserr;
int ignore_crossmnt = 0;
dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
if (IS_ERR(dentry))
return nfserrno(PTR_ERR(dentry));
if (!dentry->d_inode) {
/*
* nfsd_buffered_readdir drops the i_mutex between
* readdir and calling this callback, leaving 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_to_buf(p, buflen, 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(__be32 *p, int buflen, __be32 nfserr)
{
if (buflen < 6)
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);
int buflen;
__be32 *p = cd->buffer;
__be32 *cookiep;
__be32 nfserr = nfserr_toosmall;
/* In nfsv4, "." and ".." never make it onto the wire.. */
if (name && isdotent(name, namlen)) {
cd->common.err = nfs_ok;
return 0;
}
if (cd->offset)
xdr_encode_hyper(cd->offset, (u64) offset);
buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
if (buflen < 0)
goto fail;
*p++ = xdr_one; /* mark entry present */
cookiep = p;
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(cd, name, namlen, &p, buflen);
switch (nfserr) {
case nfs_ok:
break;
case nfserr_resource:
nfserr = nfserr_toosmall;
goto fail;
case nfserr_noent:
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(p, buflen, nfserr);
if (p == NULL) {
nfserr = nfserr_toosmall;
goto fail;
}
}
cd->buflen -= (p - cd->buffer);
cd->buffer = p;
cd->offset = cookiep;
skip_entry:
cd->common.err = nfs_ok;
return 0;
fail:
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;
WRITE32(sid->si_generation);
WRITEMEM(&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;
if (!nfserr) {
p = xdr_reserve_space(xdr, 8);
if (!p)
return nfserr_resource;
WRITE32(access->ac_supported);
WRITE32(access->ac_resp_access);
}
return nfserr;
}
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;
if (!nfserr) {
p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
if (!p)
return nfserr_resource;
WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
WRITE32(bcts->dir);
/* Sorry, we do not yet support RDMA over 4.1: */
WRITE32(0);
}
return nfserr;
}
static __be32
nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
{
struct xdr_stream *xdr = &resp->xdr;
if (!nfserr)
nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
return nfserr;
}
static __be32
nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
if (!nfserr) {
p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
if (!p)
return nfserr_resource;
WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
}
return nfserr;
}
static __be32
nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
if (!nfserr) {
p = xdr_reserve_space(xdr, 32);
if (!p)
return nfserr_resource;
write_cinfo(&p, &create->cr_cinfo);
WRITE32(2);
WRITE32(create->cr_bmval[0]);
WRITE32(create->cr_bmval[1]);
}
return nfserr;
}
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;
if (nfserr)
return nfserr;
nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
getattr->ga_bmval,
resp->rqstp, 0);
return nfserr;
}
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;
if (!nfserr) {
len = fhp->fh_handle.fh_size;
p = xdr_reserve_space(xdr, len + 4);
if (!p)
return nfserr_resource;
WRITE32(len);
WRITEMEM(&fhp->fh_handle.fh_base, len);
}
return nfserr;
}
/*
* 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;
p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
if (!p)
return nfserr_resource;
WRITE64(ld->ld_start);
WRITE64(ld->ld_length);
WRITE32(ld->ld_type);
if (conf->len) {
WRITEMEM(&ld->ld_clientid, 8);
WRITE32(conf->len);
WRITEMEM(conf->data, conf->len);
kfree(conf->data);
} else { /* non - nfsv4 lock in conflict, no clientid nor owner */
WRITE64((u64)0); /* clientid */
WRITE32(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;
if (!nfserr)
nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
return nfserr;
}
static __be32
nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
if (!nfserr) {
p = xdr_reserve_space(xdr, 20);
if (!p)
return nfserr_resource;
write_cinfo(&p, &link->li_cinfo);
}
return nfserr;
}
static __be32
nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
if (nfserr)
goto out;
nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
if (nfserr)
goto out;
p = xdr_reserve_space(xdr, 40);
if (!p)
return nfserr_resource;
write_cinfo(&p, &open->op_cinfo);
WRITE32(open->op_rflags);
WRITE32(2);
WRITE32(open->op_bmval[0]);
WRITE32(open->op_bmval[1]);
WRITE32(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;
WRITE32(open->op_recall);
/*
* TODO: ACE's in delegations
*/
WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
WRITE32(0);
WRITE32(0);
WRITE32(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;
WRITE32(0);
/*
* TODO: space_limit's in delegations
*/
WRITE32(NFS4_LIMIT_SIZE);
WRITE32(~(u32)0);
WRITE32(~(u32)0);
/*
* TODO: ACE's in delegations
*/
WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
WRITE32(0);
WRITE32(0);
WRITE32(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;
WRITE32(open->op_why_no_deleg);
WRITE32(0); /* deleg signaling not supported yet */
break;
default:
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
WRITE32(open->op_why_no_deleg);
}
break;
default:
BUG();
}
/* XXX save filehandle here */
out:
return nfserr;
}
static __be32
nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
{
struct xdr_stream *xdr = &resp->xdr;
if (!nfserr)
nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
return nfserr;
}
static __be32
nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
{
struct xdr_stream *xdr = &resp->xdr;
if (!nfserr)
nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
return nfserr;
}
static __be32
nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_read *read)
{
u32 eof;
int v;
struct page *page;
unsigned long maxcount;
struct xdr_stream *xdr = &resp->xdr;
int starting_len = xdr->buf->len;
long len;
__be32 *p;
if (nfserr)
return nfserr;
if (resp->xdr.buf->page_len)
return nfserr_resource;
p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
if (!p)
return nfserr_resource;
maxcount = svc_max_payload(resp->rqstp);
if (maxcount > read->rd_length)
maxcount = read->rd_length;
len = maxcount;
v = 0;
while (len > 0) {
page = *(resp->rqstp->rq_next_page);
if (!page) { /* ran out of pages */
maxcount -= len;
break;
}
resp->rqstp->rq_vec[v].iov_base = page_address(page);
resp->rqstp->rq_vec[v].iov_len =
len < PAGE_SIZE ? len : PAGE_SIZE;
resp->rqstp->rq_next_page++;
v++;
len -= PAGE_SIZE;
}
read->rd_vlen = v;
nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
&maxcount);
if (nfserr) {
/*
* nfsd_splice_actor may have already messed with the
* page length; reset it so as not to confuse
* xdr_truncate_encode:
*/
xdr->buf->page_len = 0;
xdr_truncate_encode(xdr, starting_len);
return nfserr;
}
eof = (read->rd_offset + maxcount >=
read->rd_fhp->fh_dentry->d_inode->i_size);
WRITE32(eof);
WRITE32(maxcount);
WARN_ON_ONCE(resp->xdr.buf->head[0].iov_len != (char *)p
- (char *)resp->xdr.buf->head[0].iov_base);
resp->xdr.buf->page_len = maxcount;
xdr->buf->len += maxcount;
xdr->iov = xdr->buf->tail;
/* Use rest of head for padding and remaining ops: */
resp->xdr.buf->tail[0].iov_base = p;
resp->xdr.buf->tail[0].iov_len = 0;
if (maxcount&3) {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
WRITE32(0);
resp->xdr.buf->tail[0].iov_base += maxcount&3;
resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
xdr->buf->len -= (maxcount&3);
}
return 0;
}
static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
{
int maxcount;
struct xdr_stream *xdr = &resp->xdr;
char *page;
int length_offset = xdr->buf->len;
__be32 *p;
if (nfserr)
return nfserr;
if (resp->xdr.buf->page_len)
return nfserr_resource;
if (!*resp->rqstp->rq_next_page)
return nfserr_resource;
page = page_address(*(resp->rqstp->rq_next_page++));
maxcount = PAGE_SIZE;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
/*
* XXX: By default, the ->readlink() VFS op will truncate symlinks
* if they would overflow the buffer. Is this kosher in NFSv4? If
* not, one easy fix is: if ->readlink() precisely fills the buffer,
* assume that truncation occurred, and return NFS4ERR_RESOURCE.
*/
nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
if (nfserr == nfserr_isdir)
nfserr = nfserr_inval;
if (nfserr) {
xdr_truncate_encode(xdr, length_offset);
return nfserr;
}
WRITE32(maxcount);
resp->xdr.buf->head[0].iov_len = (char *)p
- (char *)resp->xdr.buf->head[0].iov_base;
resp->xdr.buf->page_len = maxcount;
xdr->buf->len += maxcount;
xdr->iov = xdr->buf->tail;
/* Use rest of head for padding and remaining ops: */
resp->xdr.buf->tail[0].iov_base = p;
resp->xdr.buf->tail[0].iov_len = 0;
if (maxcount&3) {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
WRITE32(0);
resp->xdr.buf->tail[0].iov_base += maxcount&3;
resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
}
return 0;
}
static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
{
int maxcount;
loff_t offset;
struct xdr_stream *xdr = &resp->xdr;
int starting_len = xdr->buf->len;
__be32 *page, *tailbase;
__be32 *p;
if (nfserr)
return nfserr;
if (resp->xdr.buf->page_len)
return nfserr_resource;
if (!*resp->rqstp->rq_next_page)
return nfserr_resource;
p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
if (!p)
return nfserr_resource;
/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
WRITE32(0);
WRITE32(0);
resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
- (char *)resp->xdr.buf->head[0].iov_base;
tailbase = p;
maxcount = PAGE_SIZE;
if (maxcount > readdir->rd_maxcount)
maxcount = readdir->rd_maxcount;
/*
* Convert from bytes to words, account for the two words already
* written, make sure to leave two words at the end for the next
* pointer and eof field.
*/
maxcount = (maxcount >> 2) - 4;
if (maxcount < 0) {
nfserr = nfserr_toosmall;
goto err_no_verf;
}
page = page_address(*(resp->rqstp->rq_next_page++));
readdir->common.err = 0;
readdir->buflen = maxcount;
readdir->buffer = page;
readdir->offset = NULL;
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 &&
readdir->buffer == page)
nfserr = nfserr_toosmall;
if (nfserr)
goto err_no_verf;
if (readdir->offset)
xdr_encode_hyper(readdir->offset, offset);
p = readdir->buffer;
*p++ = 0; /* no more entries */
*p++ = htonl(readdir->common.err == nfserr_eof);
resp->xdr.buf->page_len = ((char *)p) -
(char*)page_address(*(resp->rqstp->rq_next_page-1));
xdr->buf->len += xdr->buf->page_len;
xdr->iov = xdr->buf->tail;
/* Use rest of head for padding and remaining ops: */
resp->xdr.buf->tail[0].iov_base = tailbase;
resp->xdr.buf->tail[0].iov_len = 0;
resp->xdr.p = resp->xdr.buf->tail[0].iov_base;
resp->xdr.end = resp->xdr.p +
(PAGE_SIZE - resp->xdr.buf->head[0].iov_len)/4;
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;
if (!nfserr) {
p = xdr_reserve_space(xdr, 20);
if (!p)
return nfserr_resource;
write_cinfo(&p, &remove->rm_cinfo);
}
return nfserr;
}
static __be32
nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
{
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
if (!nfserr) {
p = xdr_reserve_space(xdr, 40);
if (!p)
return nfserr_resource;
write_cinfo(&p, &rename->rn_sinfo);
write_cinfo(&p, &rename->rn_tinfo);
}
return nfserr;
}
static __be32
nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
__be32 nfserr, 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 (nfserr)
goto out;
nfserr = nfserr_resource;
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)
goto out;
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)
goto out;
WRITE32(RPC_AUTH_GSS);
WRITE32(info.oid.len);
WRITEMEM(info.oid.data, info.oid.len);
WRITE32(info.qop);
WRITE32(info.service);
} else if (pf < RPC_AUTH_MAXFLAVOR) {
supported++;
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out;
WRITE32(pf);
} else {
if (report)
pr_warn("NFS: SECINFO: security flavor %u "
"is not supported\n", pf);
}
}
if (nflavs != supported)
report = false;
*flavorsp = htonl(supported);
nfserr = 0;
out:
if (exp)
exp_put(exp);
return nfserr;
}
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, nfserr, 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, nfserr, 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) {
WRITE32(3);
WRITE32(0);
WRITE32(0);
WRITE32(0);
}
else {
WRITE32(3);
WRITE32(setattr->sa_bmval[0]);
WRITE32(setattr->sa_bmval[1]);
WRITE32(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;
WRITEMEM(&scd->se_clientid, 8);
WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
}
else if (nfserr == nfserr_clid_inuse) {
p = xdr_reserve_space(xdr, 8);
if (!p)
return nfserr_resource;
WRITE32(0);
WRITE32(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;
if (!nfserr) {
p = xdr_reserve_space(xdr, 16);
if (!p)
return nfserr_resource;
WRITE32(write->wr_bytes_written);
WRITE32(write->wr_how_written);
WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
}
return nfserr;
}
static const u32 nfs4_minimal_spo_must_enforce[2] = {
[1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
1 << (OP_EXCHANGE_ID - 32) |
1 << (OP_CREATE_SESSION - 32) |
1 << (OP_DESTROY_SESSION - 32) |
1 << (OP_DESTROY_CLIENTID - 32)
};
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;
if (nfserr)
return nfserr;
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;
WRITEMEM(&exid->clientid, 8);
WRITE32(exid->seqid);
WRITE32(exid->flags);
WRITE32(exid->spa_how);
switch (exid->spa_how) {
case SP4_NONE:
break;
case SP4_MACH_CRED:
/* spo_must_enforce, spo_must_allow */
p = xdr_reserve_space(xdr, 16);
if (!p)
return nfserr_resource;
/* spo_must_enforce bitmap: */
WRITE32(2);
WRITE32(nfs4_minimal_spo_must_enforce[0]);
WRITE32(nfs4_minimal_spo_must_enforce[1]);
/* empty spo_must_allow bitmap: */
WRITE32(0);
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 */
WRITE64(minor_id); /* Minor id */
/* major id */
WRITE32(major_id_sz);
WRITEMEM(major_id, major_id_sz);
/* Server scope */
WRITE32(server_scope_sz);
WRITEMEM(server_scope, server_scope_sz);
/* Implementation id */
WRITE32(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;
if (nfserr)
return nfserr;
p = xdr_reserve_space(xdr, 24);
if (!p)
return nfserr_resource;
WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
WRITE32(sess->seqid);
WRITE32(sess->flags);
p = xdr_reserve_space(xdr, 28);
if (!p)
return nfserr_resource;
WRITE32(0); /* headerpadsz */
WRITE32(sess->fore_channel.maxreq_sz);
WRITE32(sess->fore_channel.maxresp_sz);
WRITE32(sess->fore_channel.maxresp_cached);
WRITE32(sess->fore_channel.maxops);
WRITE32(sess->fore_channel.maxreqs);
WRITE32(sess->fore_channel.nr_rdma_attrs);
if (sess->fore_channel.nr_rdma_attrs) {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
WRITE32(sess->fore_channel.rdma_attrs);
}
p = xdr_reserve_space(xdr, 28);
if (!p)
return nfserr_resource;
WRITE32(0); /* headerpadsz */
WRITE32(sess->back_channel.maxreq_sz);
WRITE32(sess->back_channel.maxresp_sz);
WRITE32(sess->back_channel.maxresp_cached);
WRITE32(sess->back_channel.maxops);
WRITE32(sess->back_channel.maxreqs);
WRITE32(sess->back_channel.nr_rdma_attrs);
if (sess->back_channel.nr_rdma_attrs) {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
WRITE32(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;
if (nfserr)
return nfserr;
p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
if (!p)
return nfserr_resource;
WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
WRITE32(seq->seqid);
WRITE32(seq->slotid);
/* Note slotid's are numbered from zero: */
WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
WRITE32(seq->status_flags);
resp->cstate.datap = p; /* 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;
if (nfserr)
return nfserr;
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 nfserr;
}
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 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,
[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,
[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,
};
/*
* Calculate the total amount of memory that the compound response has taken
* after encoding the current operation with pad.
*
* pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
* which was specified at nfsd4_operation, else pad is zero.
*
* Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
*
* Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
* will be at least a page and will therefore hold the xdr_buf head.
*/
__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
{
struct xdr_buf *xb = &resp->rqstp->rq_res;
struct nfsd4_session *session = NULL;
struct nfsd4_slot *slot = resp->cstate.slot;
u32 length, tlen = 0;
if (!nfsd4_has_session(&resp->cstate))
return 0;
session = resp->cstate.session;
if (xb->page_len == 0) {
length = (char *)resp->xdr.p - (char *)xb->head[0].iov_base + pad;
} else {
if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
tlen = (char *)resp->xdr.p - (char *)xb->tail[0].iov_base;
length = xb->head[0].iov_len + xb->page_len + tlen + pad;
}
dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
length, xb->page_len, tlen, pad);
if (length > session->se_fchannel.maxresp_sz)
return nfserr_rep_too_big;
if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
length > session->se_fchannel.maxresp_cached)
return nfserr_rep_too_big_to_cache;
return 0;
}
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;
int post_err_offset;
nfsd4_enc encoder;
__be32 *p;
p = xdr_reserve_space(xdr, 8);
if (!p) {
WARN_ON_ONCE(1);
return;
}
WRITE32(op->opnum);
post_err_offset = xdr->buf->len;
if (op->opnum == OP_ILLEGAL)
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);
/* 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 ||
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.
*
* called with nfs4_lock_state() held
*/
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;
}
WRITE32(op->opnum);
*p++ = rp->rp_status; /* already xdr'ed */
WRITEMEM(rp->rp_buf, rp->rp_buflen);
}
int
nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
return xdr_ressize_check(rqstp, p);
}
int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
{
struct svc_rqst *rqstp = rq;
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 tmpbuf *tb = args->to_free;
args->to_free = tb->next;
tb->release(tb->buf);
kfree(tb);
}
return 1;
}
int
nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
{
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->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, struct nfsd4_compoundres *resp)
{
/*
* All that remains is to write the tag and operation count...
*/
struct nfsd4_compound_state *cs = &resp->cstate;
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);
p = resp->tagp;
*p++ = htonl(resp->taglen);
memcpy(p, resp->tag, resp->taglen);
p += XDR_QUADLEN(resp->taglen);
*p++ = htonl(resp->opcnt);
if (nfsd4_has_session(cs)) {
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
struct nfs4_client *clp = cs->session->se_client;
if (cs->status != nfserr_replay_cache) {
nfsd4_store_cache_entry(resp);
cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
}
/* Renew the clientid on success and on replay */
spin_lock(&nn->client_lock);
nfsd4_put_session(cs->session);
spin_unlock(&nn->client_lock);
put_client_renew(clp);
}
return 1;
}
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
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