- 根目录:
- fs
- nfs
- callback_xdr.c
/*
* linux/fs/nfs/callback_xdr.c
*
* Copyright (C) 2004 Trond Myklebust
*
* NFSv4 callback encode/decode procedures
*/
#include <linux/kernel.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/slab.h>
#include <linux/sunrpc/bc_xprt.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "internal.h"
#define CB_OP_TAGLEN_MAXSZ (512)
#define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
#define CB_OP_GETATTR_BITMAP_MAXSZ (4)
#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
CB_OP_GETATTR_BITMAP_MAXSZ + \
2 + 2 + 3 + 3)
#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#if defined(CONFIG_NFS_V4_1)
#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
4 + 1 + 3)
#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#endif /* CONFIG_NFS_V4_1 */
#define NFSDBG_FACILITY NFSDBG_CALLBACK
/* Internal error code */
#define NFS4ERR_RESOURCE_HDR 11050
typedef __be32 (*callback_process_op_t)(void *, void *,
struct cb_process_state *);
typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
struct callback_op {
callback_process_op_t process_op;
callback_decode_arg_t decode_args;
callback_encode_res_t encode_res;
long res_maxsize;
};
static struct callback_op callback_ops[];
static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
return htonl(NFS4_OK);
}
static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
return xdr_argsize_check(rqstp, p);
}
static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
return xdr_ressize_check(rqstp, p);
}
static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
{
__be32 *p;
p = xdr_inline_decode(xdr, nbytes);
if (unlikely(p == NULL))
printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
return p;
}
static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
{
__be32 *p;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*len = ntohl(*p);
if (*len != 0) {
p = read_buf(xdr, *len);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*str = (const char *)p;
} else
*str = NULL;
return 0;
}
static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
{
__be32 *p;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
fh->size = ntohl(*p);
if (fh->size > NFS4_FHSIZE)
return htonl(NFS4ERR_BADHANDLE);
p = read_buf(xdr, fh->size);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
memcpy(&fh->data[0], p, fh->size);
memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
return 0;
}
static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
{
__be32 *p;
unsigned int attrlen;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
attrlen = ntohl(*p);
p = read_buf(xdr, attrlen << 2);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
if (likely(attrlen > 0))
bitmap[0] = ntohl(*p++);
if (attrlen > 1)
bitmap[1] = ntohl(*p);
return 0;
}
static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
__be32 *p;
p = read_buf(xdr, 16);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
memcpy(stateid->data, p, 16);
return 0;
}
static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
{
__be32 *p;
__be32 status;
status = decode_string(xdr, &hdr->taglen, &hdr->tag);
if (unlikely(status != 0))
return status;
/* We do not like overly long tags! */
if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
__func__, hdr->taglen);
return htonl(NFS4ERR_RESOURCE);
}
p = read_buf(xdr, 12);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
hdr->minorversion = ntohl(*p++);
/* Check minor version is zero or one. */
if (hdr->minorversion <= 1) {
hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */
} else {
printk(KERN_WARNING "%s: NFSv4 server callback with "
"illegal minor version %u!\n",
__func__, hdr->minorversion);
return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
}
hdr->nops = ntohl(*p);
dprintk("%s: minorversion %d nops %d\n", __func__,
hdr->minorversion, hdr->nops);
return 0;
}
static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
{
__be32 *p;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE_HDR);
*op = ntohl(*p);
return 0;
}
static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
{
__be32 status;
status = decode_fh(xdr, &args->fh);
if (unlikely(status != 0))
goto out;
args->addr = svc_addr(rqstp);
status = decode_bitmap(xdr, args->bitmap);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
return status;
}
static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
{
__be32 *p;
__be32 status;
args->addr = svc_addr(rqstp);
status = decode_stateid(xdr, &args->stateid);
if (unlikely(status != 0))
goto out;
p = read_buf(xdr, 4);
if (unlikely(p == NULL)) {
status = htonl(NFS4ERR_RESOURCE);
goto out;
}
args->truncate = ntohl(*p);
status = decode_fh(xdr, &args->fh);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
return status;
}
#if defined(CONFIG_NFS_V4_1)
static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
struct cb_layoutrecallargs *args)
{
__be32 *p;
__be32 status = 0;
uint32_t iomode;
args->cbl_addr = svc_addr(rqstp);
p = read_buf(xdr, 4 * sizeof(uint32_t));
if (unlikely(p == NULL)) {
status = htonl(NFS4ERR_BADXDR);
goto out;
}
args->cbl_layout_type = ntohl(*p++);
/* Depite the spec's xdr, iomode really belongs in the FILE switch,
* as it is unusable and ignored with the other types.
*/
iomode = ntohl(*p++);
args->cbl_layoutchanged = ntohl(*p++);
args->cbl_recall_type = ntohl(*p++);
if (args->cbl_recall_type == RETURN_FILE) {
args->cbl_range.iomode = iomode;
status = decode_fh(xdr, &args->cbl_fh);
if (unlikely(status != 0))
goto out;
p = read_buf(xdr, 2 * sizeof(uint64_t));
if (unlikely(p == NULL)) {
status = htonl(NFS4ERR_BADXDR);
goto out;
}
p = xdr_decode_hyper(p, &args->cbl_range.offset);
p = xdr_decode_hyper(p, &args->cbl_range.length);
status = decode_stateid(xdr, &args->cbl_stateid);
if (unlikely(status != 0))
goto out;
} else if (args->cbl_recall_type == RETURN_FSID) {
p = read_buf(xdr, 2 * sizeof(uint64_t));
if (unlikely(p == NULL)) {
status = htonl(NFS4ERR_BADXDR);
goto out;
}
p = xdr_decode_hyper(p, &args->cbl_fsid.major);
p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
} else if (args->cbl_recall_type != RETURN_ALL) {
status = htonl(NFS4ERR_BADXDR);
goto out;
}
dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
__func__,
args->cbl_layout_type, iomode,
args->cbl_layoutchanged, args->cbl_recall_type);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
return status;
}
static __be32 decode_sessionid(struct xdr_stream *xdr,
struct nfs4_sessionid *sid)
{
__be32 *p;
int len = NFS4_MAX_SESSIONID_LEN;
p = read_buf(xdr, len);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
memcpy(sid->data, p, len);
return 0;
}
static __be32 decode_rc_list(struct xdr_stream *xdr,
struct referring_call_list *rc_list)
{
__be32 *p;
int i;
__be32 status;
status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
if (status)
goto out;
status = htonl(NFS4ERR_RESOURCE);
p = read_buf(xdr, sizeof(uint32_t));
if (unlikely(p == NULL))
goto out;
rc_list->rcl_nrefcalls = ntohl(*p++);
if (rc_list->rcl_nrefcalls) {
p = read_buf(xdr,
rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
if (unlikely(p == NULL))
goto out;
rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
sizeof(*rc_list->rcl_refcalls),
GFP_KERNEL);
if (unlikely(rc_list->rcl_refcalls == NULL))
goto out;
for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
}
}
status = 0;
out:
return status;
}
static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
struct cb_sequenceargs *args)
{
__be32 *p;
int i;
__be32 status;
status = decode_sessionid(xdr, &args->csa_sessionid);
if (status)
goto out;
status = htonl(NFS4ERR_RESOURCE);
p = read_buf(xdr, 5 * sizeof(uint32_t));
if (unlikely(p == NULL))
goto out;
args->csa_addr = svc_addr(rqstp);
args->csa_sequenceid = ntohl(*p++);
args->csa_slotid = ntohl(*p++);
args->csa_highestslotid = ntohl(*p++);
args->csa_cachethis = ntohl(*p++);
args->csa_nrclists = ntohl(*p++);
args->csa_rclists = NULL;
if (args->csa_nrclists) {
args->csa_rclists = kmalloc(args->csa_nrclists *
sizeof(*args->csa_rclists),
GFP_KERNEL);
if (unlikely(args->csa_rclists == NULL))
goto out;
for (i = 0; i < args->csa_nrclists; i++) {
status = decode_rc_list(xdr, &args->csa_rclists[i]);
if (status)
goto out_free;
}
}
status = 0;
dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
"highestslotid %u cachethis %d nrclists %u\n",
__func__,
((u32 *)&args->csa_sessionid)[0],
((u32 *)&args->csa_sessionid)[1],
((u32 *)&args->csa_sessionid)[2],
((u32 *)&args->csa_sessionid)[3],
args->csa_sequenceid, args->csa_slotid,
args->csa_highestslotid, args->csa_cachethis,
args->csa_nrclists);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
return status;
out_free:
for (i = 0; i < args->csa_nrclists; i++)
kfree(args->csa_rclists[i].rcl_refcalls);
kfree(args->csa_rclists);
goto out;
}
static __be32 decode_recallany_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
struct cb_recallanyargs *args)
{
__be32 *p;
args->craa_addr = svc_addr(rqstp);
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_BADXDR);
args->craa_objs_to_keep = ntohl(*p++);
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_BADXDR);
args->craa_type_mask = ntohl(*p);
return 0;
}
static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
struct cb_recallslotargs *args)
{
__be32 *p;
args->crsa_addr = svc_addr(rqstp);
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_BADXDR);
args->crsa_target_max_slots = ntohl(*p++);
return 0;
}
#endif /* CONFIG_NFS_V4_1 */
static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
{
__be32 *p;
p = xdr_reserve_space(xdr, 4 + len);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
xdr_encode_opaque(p, str, len);
return 0;
}
#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
{
__be32 bm[2];
__be32 *p;
bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
if (bm[1] != 0) {
p = xdr_reserve_space(xdr, 16);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*p++ = htonl(2);
*p++ = bm[0];
*p++ = bm[1];
} else if (bm[0] != 0) {
p = xdr_reserve_space(xdr, 12);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*p++ = htonl(1);
*p++ = bm[0];
} else {
p = xdr_reserve_space(xdr, 8);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*p++ = htonl(0);
}
*savep = p;
return 0;
}
static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
{
__be32 *p;
if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
return 0;
p = xdr_reserve_space(xdr, 8);
if (unlikely(!p))
return htonl(NFS4ERR_RESOURCE);
p = xdr_encode_hyper(p, change);
return 0;
}
static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
{
__be32 *p;
if (!(bitmap[0] & FATTR4_WORD0_SIZE))
return 0;
p = xdr_reserve_space(xdr, 8);
if (unlikely(!p))
return htonl(NFS4ERR_RESOURCE);
p = xdr_encode_hyper(p, size);
return 0;
}
static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
{
__be32 *p;
p = xdr_reserve_space(xdr, 12);
if (unlikely(!p))
return htonl(NFS4ERR_RESOURCE);
p = xdr_encode_hyper(p, time->tv_sec);
*p = htonl(time->tv_nsec);
return 0;
}
static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
{
if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
return 0;
return encode_attr_time(xdr,time);
}
static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
{
if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
return 0;
return encode_attr_time(xdr,time);
}
static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
{
__be32 status;
hdr->status = xdr_reserve_space(xdr, 4);
if (unlikely(hdr->status == NULL))
return htonl(NFS4ERR_RESOURCE);
status = encode_string(xdr, hdr->taglen, hdr->tag);
if (unlikely(status != 0))
return status;
hdr->nops = xdr_reserve_space(xdr, 4);
if (unlikely(hdr->nops == NULL))
return htonl(NFS4ERR_RESOURCE);
return 0;
}
static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
{
__be32 *p;
p = xdr_reserve_space(xdr, 8);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE_HDR);
*p++ = htonl(op);
*p = res;
return 0;
}
static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
{
__be32 *savep = NULL;
__be32 status = res->status;
if (unlikely(status != 0))
goto out;
status = encode_attr_bitmap(xdr, res->bitmap, &savep);
if (unlikely(status != 0))
goto out;
status = encode_attr_change(xdr, res->bitmap, res->change_attr);
if (unlikely(status != 0))
goto out;
status = encode_attr_size(xdr, res->bitmap, res->size);
if (unlikely(status != 0))
goto out;
status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
if (unlikely(status != 0))
goto out;
status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
*savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
return status;
}
#if defined(CONFIG_NFS_V4_1)
static __be32 encode_sessionid(struct xdr_stream *xdr,
const struct nfs4_sessionid *sid)
{
__be32 *p;
int len = NFS4_MAX_SESSIONID_LEN;
p = xdr_reserve_space(xdr, len);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
memcpy(p, sid, len);
return 0;
}
static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
const struct cb_sequenceres *res)
{
__be32 *p;
unsigned status = res->csr_status;
if (unlikely(status != 0))
goto out;
encode_sessionid(xdr, &res->csr_sessionid);
p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*p++ = htonl(res->csr_sequenceid);
*p++ = htonl(res->csr_slotid);
*p++ = htonl(res->csr_highestslotid);
*p++ = htonl(res->csr_target_highestslotid);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
return status;
}
static __be32
preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
{
if (op_nr == OP_CB_SEQUENCE) {
if (nop != 0)
return htonl(NFS4ERR_SEQUENCE_POS);
} else {
if (nop == 0)
return htonl(NFS4ERR_OP_NOT_IN_SESSION);
}
switch (op_nr) {
case OP_CB_GETATTR:
case OP_CB_RECALL:
case OP_CB_SEQUENCE:
case OP_CB_RECALL_ANY:
case OP_CB_RECALL_SLOT:
case OP_CB_LAYOUTRECALL:
*op = &callback_ops[op_nr];
break;
case OP_CB_NOTIFY_DEVICEID:
case OP_CB_NOTIFY:
case OP_CB_PUSH_DELEG:
case OP_CB_RECALLABLE_OBJ_AVAIL:
case OP_CB_WANTS_CANCELLED:
case OP_CB_NOTIFY_LOCK:
return htonl(NFS4ERR_NOTSUPP);
default:
return htonl(NFS4ERR_OP_ILLEGAL);
}
return htonl(NFS_OK);
}
static void nfs4_callback_free_slot(struct nfs4_session *session)
{
struct nfs4_slot_table *tbl = &session->bc_slot_table;
spin_lock(&tbl->slot_tbl_lock);
/*
* Let the state manager know callback processing done.
* A single slot, so highest used slotid is either 0 or -1
*/
tbl->highest_used_slotid--;
nfs4_check_drain_bc_complete(session);
spin_unlock(&tbl->slot_tbl_lock);
}
static void nfs4_cb_free_slot(struct nfs_client *clp)
{
if (clp && clp->cl_session)
nfs4_callback_free_slot(clp->cl_session);
}
/* A single slot, so highest used slotid is either 0 or -1 */
void nfs4_cb_take_slot(struct nfs_client *clp)
{
struct nfs4_slot_table *tbl = &clp->cl_session->bc_slot_table;
spin_lock(&tbl->slot_tbl_lock);
tbl->highest_used_slotid++;
BUG_ON(tbl->highest_used_slotid != 0);
spin_unlock(&tbl->slot_tbl_lock);
}
#else /* CONFIG_NFS_V4_1 */
static __be32
preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
{
return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
}
static void nfs4_cb_free_slot(struct nfs_client *clp)
{
}
#endif /* CONFIG_NFS_V4_1 */
static __be32
preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
{
switch (op_nr) {
case OP_CB_GETATTR:
case OP_CB_RECALL:
*op = &callback_ops[op_nr];
break;
default:
return htonl(NFS4ERR_OP_ILLEGAL);
}
return htonl(NFS_OK);
}
static __be32 process_op(uint32_t minorversion, int nop,
struct svc_rqst *rqstp,
struct xdr_stream *xdr_in, void *argp,
struct xdr_stream *xdr_out, void *resp,
struct cb_process_state *cps)
{
struct callback_op *op = &callback_ops[0];
unsigned int op_nr;
__be32 status;
long maxlen;
__be32 res;
dprintk("%s: start\n", __func__);
status = decode_op_hdr(xdr_in, &op_nr);
if (unlikely(status))
return status;
dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
__func__, minorversion, nop, op_nr);
status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) :
preprocess_nfs4_op(op_nr, &op);
if (status == htonl(NFS4ERR_OP_ILLEGAL))
op_nr = OP_CB_ILLEGAL;
if (status)
goto encode_hdr;
if (cps->drc_status) {
status = cps->drc_status;
goto encode_hdr;
}
maxlen = xdr_out->end - xdr_out->p;
if (maxlen > 0 && maxlen < PAGE_SIZE) {
status = op->decode_args(rqstp, xdr_in, argp);
if (likely(status == 0))
status = op->process_op(argp, resp, cps);
} else
status = htonl(NFS4ERR_RESOURCE);
encode_hdr:
res = encode_op_hdr(xdr_out, op_nr, status);
if (unlikely(res))
return res;
if (op->encode_res != NULL && status == 0)
status = op->encode_res(rqstp, xdr_out, resp);
dprintk("%s: done, status = %d\n", __func__, ntohl(status));
return status;
}
/*
* Decode, process and encode a COMPOUND
*/
static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
{
struct cb_compound_hdr_arg hdr_arg = { 0 };
struct cb_compound_hdr_res hdr_res = { NULL };
struct xdr_stream xdr_in, xdr_out;
__be32 *p, status;
struct cb_process_state cps = {
.drc_status = 0,
.clp = NULL,
};
unsigned int nops = 0;
dprintk("%s: start\n", __func__);
xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
if (status == __constant_htonl(NFS4ERR_RESOURCE))
return rpc_garbage_args;
if (hdr_arg.minorversion == 0) {
cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident);
if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
return rpc_drop_reply;
}
hdr_res.taglen = hdr_arg.taglen;
hdr_res.tag = hdr_arg.tag;
if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
return rpc_system_err;
while (status == 0 && nops != hdr_arg.nops) {
status = process_op(hdr_arg.minorversion, nops, rqstp,
&xdr_in, argp, &xdr_out, resp, &cps);
nops++;
}
/* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
* resource error in cb_compound status without returning op */
if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
status = htonl(NFS4ERR_RESOURCE);
nops--;
}
*hdr_res.status = status;
*hdr_res.nops = htonl(nops);
nfs4_cb_free_slot(cps.clp);
nfs_put_client(cps.clp);
dprintk("%s: done, status = %u\n", __func__, ntohl(status));
return rpc_success;
}
/*
* Define NFS4 callback COMPOUND ops.
*/
static struct callback_op callback_ops[] = {
[0] = {
.res_maxsize = CB_OP_HDR_RES_MAXSZ,
},
[OP_CB_GETATTR] = {
.process_op = (callback_process_op_t)nfs4_callback_getattr,
.decode_args = (callback_decode_arg_t)decode_getattr_args,
.encode_res = (callback_encode_res_t)encode_getattr_res,
.res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
},
[OP_CB_RECALL] = {
.process_op = (callback_process_op_t)nfs4_callback_recall,
.decode_args = (callback_decode_arg_t)decode_recall_args,
.res_maxsize = CB_OP_RECALL_RES_MAXSZ,
},
#if defined(CONFIG_NFS_V4_1)
[OP_CB_LAYOUTRECALL] = {
.process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
.decode_args =
(callback_decode_arg_t)decode_layoutrecall_args,
.res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
},
[OP_CB_SEQUENCE] = {
.process_op = (callback_process_op_t)nfs4_callback_sequence,
.decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
.encode_res = (callback_encode_res_t)encode_cb_sequence_res,
.res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
},
[OP_CB_RECALL_ANY] = {
.process_op = (callback_process_op_t)nfs4_callback_recallany,
.decode_args = (callback_decode_arg_t)decode_recallany_args,
.res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
},
[OP_CB_RECALL_SLOT] = {
.process_op = (callback_process_op_t)nfs4_callback_recallslot,
.decode_args = (callback_decode_arg_t)decode_recallslot_args,
.res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
},
#endif /* CONFIG_NFS_V4_1 */
};
/*
* Define NFS4 callback procedures
*/
static struct svc_procedure nfs4_callback_procedures1[] = {
[CB_NULL] = {
.pc_func = nfs4_callback_null,
.pc_decode = (kxdrproc_t)nfs4_decode_void,
.pc_encode = (kxdrproc_t)nfs4_encode_void,
.pc_xdrressize = 1,
},
[CB_COMPOUND] = {
.pc_func = nfs4_callback_compound,
.pc_encode = (kxdrproc_t)nfs4_encode_void,
.pc_argsize = 256,
.pc_ressize = 256,
.pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
}
};
struct svc_version nfs4_callback_version1 = {
.vs_vers = 1,
.vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
.vs_proc = nfs4_callback_procedures1,
.vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
.vs_dispatch = NULL,
.vs_hidden = 1,
};
struct svc_version nfs4_callback_version4 = {
.vs_vers = 4,
.vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
.vs_proc = nfs4_callback_procedures1,
.vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
.vs_dispatch = NULL,
};