11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/nfs/callback_xdr.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2004 Trond Myklebust 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * NFSv4 callback encode/decode procedures 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds #include <linux/config.h> 91da177e4SLinus Torvalds #include <linux/kernel.h> 101da177e4SLinus Torvalds #include <linux/sunrpc/svc.h> 111da177e4SLinus Torvalds #include <linux/nfs4.h> 121da177e4SLinus Torvalds #include <linux/nfs_fs.h> 134ce79717STrond Myklebust #include "nfs4_fs.h" 141da177e4SLinus Torvalds #include "callback.h" 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds #define CB_OP_TAGLEN_MAXSZ (512) 171da177e4SLinus Torvalds #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ) 181da177e4SLinus Torvalds #define CB_OP_GETATTR_BITMAP_MAXSZ (4) 191da177e4SLinus Torvalds #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 201da177e4SLinus Torvalds CB_OP_GETATTR_BITMAP_MAXSZ + \ 211da177e4SLinus Torvalds 2 + 2 + 3 + 3) 221da177e4SLinus Torvalds #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_CALLBACK 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds typedef unsigned (*callback_process_op_t)(void *, void *); 271da177e4SLinus Torvalds typedef unsigned (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 281da177e4SLinus Torvalds typedef unsigned (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds struct callback_op { 321da177e4SLinus Torvalds callback_process_op_t process_op; 331da177e4SLinus Torvalds callback_decode_arg_t decode_args; 341da177e4SLinus Torvalds callback_encode_res_t encode_res; 351da177e4SLinus Torvalds long res_maxsize; 361da177e4SLinus Torvalds }; 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds static struct callback_op callback_ops[]; 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds static int nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 411da177e4SLinus Torvalds { 421da177e4SLinus Torvalds return htonl(NFS4_OK); 431da177e4SLinus Torvalds } 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds static int nfs4_decode_void(struct svc_rqst *rqstp, uint32_t *p, void *dummy) 461da177e4SLinus Torvalds { 471da177e4SLinus Torvalds return xdr_argsize_check(rqstp, p); 481da177e4SLinus Torvalds } 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds static int nfs4_encode_void(struct svc_rqst *rqstp, uint32_t *p, void *dummy) 511da177e4SLinus Torvalds { 521da177e4SLinus Torvalds return xdr_ressize_check(rqstp, p); 531da177e4SLinus Torvalds } 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds static uint32_t *read_buf(struct xdr_stream *xdr, int nbytes) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds uint32_t *p; 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds p = xdr_inline_decode(xdr, nbytes); 601da177e4SLinus Torvalds if (unlikely(p == NULL)) 611da177e4SLinus Torvalds printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n"); 621da177e4SLinus Torvalds return p; 631da177e4SLinus Torvalds } 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds static unsigned decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 661da177e4SLinus Torvalds { 671da177e4SLinus Torvalds uint32_t *p; 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds p = read_buf(xdr, 4); 701da177e4SLinus Torvalds if (unlikely(p == NULL)) 711da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 721da177e4SLinus Torvalds *len = ntohl(*p); 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds if (*len != 0) { 751da177e4SLinus Torvalds p = read_buf(xdr, *len); 761da177e4SLinus Torvalds if (unlikely(p == NULL)) 771da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 781da177e4SLinus Torvalds *str = (const char *)p; 791da177e4SLinus Torvalds } else 801da177e4SLinus Torvalds *str = NULL; 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds return 0; 831da177e4SLinus Torvalds } 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds static unsigned decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 861da177e4SLinus Torvalds { 871da177e4SLinus Torvalds uint32_t *p; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds p = read_buf(xdr, 4); 901da177e4SLinus Torvalds if (unlikely(p == NULL)) 911da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 921da177e4SLinus Torvalds fh->size = ntohl(*p); 931da177e4SLinus Torvalds if (fh->size > NFS4_FHSIZE) 941da177e4SLinus Torvalds return htonl(NFS4ERR_BADHANDLE); 951da177e4SLinus Torvalds p = read_buf(xdr, fh->size); 961da177e4SLinus Torvalds if (unlikely(p == NULL)) 971da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 981da177e4SLinus Torvalds memcpy(&fh->data[0], p, fh->size); 991da177e4SLinus Torvalds memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 1001da177e4SLinus Torvalds return 0; 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds static unsigned decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 1041da177e4SLinus Torvalds { 1051da177e4SLinus Torvalds uint32_t *p; 1061da177e4SLinus Torvalds unsigned int attrlen; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds p = read_buf(xdr, 4); 1091da177e4SLinus Torvalds if (unlikely(p == NULL)) 1101da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1111da177e4SLinus Torvalds attrlen = ntohl(*p); 1121da177e4SLinus Torvalds p = read_buf(xdr, attrlen << 2); 1131da177e4SLinus Torvalds if (unlikely(p == NULL)) 1141da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1151da177e4SLinus Torvalds if (likely(attrlen > 0)) 1161da177e4SLinus Torvalds bitmap[0] = ntohl(*p++); 1171da177e4SLinus Torvalds if (attrlen > 1) 1181da177e4SLinus Torvalds bitmap[1] = ntohl(*p); 1191da177e4SLinus Torvalds return 0; 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds static unsigned decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 1231da177e4SLinus Torvalds { 1241da177e4SLinus Torvalds uint32_t *p; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds p = read_buf(xdr, 16); 1271da177e4SLinus Torvalds if (unlikely(p == NULL)) 1281da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1291da177e4SLinus Torvalds memcpy(stateid->data, p, 16); 1301da177e4SLinus Torvalds return 0; 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds static unsigned decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds uint32_t *p; 1361da177e4SLinus Torvalds unsigned int minor_version; 1371da177e4SLinus Torvalds unsigned status; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds status = decode_string(xdr, &hdr->taglen, &hdr->tag); 1401da177e4SLinus Torvalds if (unlikely(status != 0)) 1411da177e4SLinus Torvalds return status; 1421da177e4SLinus Torvalds /* We do not like overly long tags! */ 1431da177e4SLinus Torvalds if (hdr->taglen > CB_OP_TAGLEN_MAXSZ-12 || hdr->taglen < 0) { 1441da177e4SLinus Torvalds printk("NFSv4 CALLBACK %s: client sent tag of length %u\n", 1451da177e4SLinus Torvalds __FUNCTION__, hdr->taglen); 1461da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds p = read_buf(xdr, 12); 1491da177e4SLinus Torvalds if (unlikely(p == NULL)) 1501da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1511da177e4SLinus Torvalds minor_version = ntohl(*p++); 1521da177e4SLinus Torvalds /* Check minor version is zero. */ 1531da177e4SLinus Torvalds if (minor_version != 0) { 1541da177e4SLinus Torvalds printk(KERN_WARNING "%s: NFSv4 server callback with illegal minor version %u!\n", 1551da177e4SLinus Torvalds __FUNCTION__, minor_version); 1561da177e4SLinus Torvalds return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds hdr->callback_ident = ntohl(*p++); 1591da177e4SLinus Torvalds hdr->nops = ntohl(*p); 1601da177e4SLinus Torvalds return 0; 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds static unsigned decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 1641da177e4SLinus Torvalds { 1651da177e4SLinus Torvalds uint32_t *p; 1661da177e4SLinus Torvalds p = read_buf(xdr, 4); 1671da177e4SLinus Torvalds if (unlikely(p == NULL)) 1681da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1691da177e4SLinus Torvalds *op = ntohl(*p); 1701da177e4SLinus Torvalds return 0; 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds static unsigned decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 1741da177e4SLinus Torvalds { 1751da177e4SLinus Torvalds unsigned status; 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds status = decode_fh(xdr, &args->fh); 1781da177e4SLinus Torvalds if (unlikely(status != 0)) 1791da177e4SLinus Torvalds goto out; 1801da177e4SLinus Torvalds args->addr = &rqstp->rq_addr; 1811da177e4SLinus Torvalds status = decode_bitmap(xdr, args->bitmap); 1821da177e4SLinus Torvalds out: 1831da177e4SLinus Torvalds dprintk("%s: exit with status = %d\n", __FUNCTION__, status); 1841da177e4SLinus Torvalds return status; 1851da177e4SLinus Torvalds } 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds static unsigned decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 1881da177e4SLinus Torvalds { 1891da177e4SLinus Torvalds uint32_t *p; 1901da177e4SLinus Torvalds unsigned status; 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds args->addr = &rqstp->rq_addr; 1931da177e4SLinus Torvalds status = decode_stateid(xdr, &args->stateid); 1941da177e4SLinus Torvalds if (unlikely(status != 0)) 1951da177e4SLinus Torvalds goto out; 1961da177e4SLinus Torvalds p = read_buf(xdr, 4); 1971da177e4SLinus Torvalds if (unlikely(p == NULL)) { 1981da177e4SLinus Torvalds status = htonl(NFS4ERR_RESOURCE); 1991da177e4SLinus Torvalds goto out; 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds args->truncate = ntohl(*p); 2021da177e4SLinus Torvalds status = decode_fh(xdr, &args->fh); 2031da177e4SLinus Torvalds out: 2041da177e4SLinus Torvalds dprintk("%s: exit with status = %d\n", __FUNCTION__, status); 2051da177e4SLinus Torvalds return 0; 2061da177e4SLinus Torvalds } 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds static unsigned encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 2091da177e4SLinus Torvalds { 2101da177e4SLinus Torvalds uint32_t *p; 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 4 + len); 2131da177e4SLinus Torvalds if (unlikely(p == NULL)) 2141da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 2151da177e4SLinus Torvalds xdr_encode_opaque(p, str, len); 2161da177e4SLinus Torvalds return 0; 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 2201da177e4SLinus Torvalds #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 2211da177e4SLinus Torvalds static unsigned encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, uint32_t **savep) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds uint32_t bm[2]; 2241da177e4SLinus Torvalds uint32_t *p; 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 2271da177e4SLinus Torvalds bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 2281da177e4SLinus Torvalds if (bm[1] != 0) { 2291da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 16); 2301da177e4SLinus Torvalds if (unlikely(p == NULL)) 2311da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 2321da177e4SLinus Torvalds *p++ = htonl(2); 2331da177e4SLinus Torvalds *p++ = bm[0]; 2341da177e4SLinus Torvalds *p++ = bm[1]; 2351da177e4SLinus Torvalds } else if (bm[0] != 0) { 2361da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 12); 2371da177e4SLinus Torvalds if (unlikely(p == NULL)) 2381da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 2391da177e4SLinus Torvalds *p++ = htonl(1); 2401da177e4SLinus Torvalds *p++ = bm[0]; 2411da177e4SLinus Torvalds } else { 2421da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 8); 2431da177e4SLinus Torvalds if (unlikely(p == NULL)) 2441da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 2451da177e4SLinus Torvalds *p++ = htonl(0); 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds *savep = p; 2481da177e4SLinus Torvalds return 0; 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds static unsigned encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 2521da177e4SLinus Torvalds { 2531da177e4SLinus Torvalds uint32_t *p; 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 2561da177e4SLinus Torvalds return 0; 2571da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 8); 2581da177e4SLinus Torvalds if (unlikely(p == 0)) 2591da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 2601da177e4SLinus Torvalds p = xdr_encode_hyper(p, change); 2611da177e4SLinus Torvalds return 0; 2621da177e4SLinus Torvalds } 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds static unsigned encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 2651da177e4SLinus Torvalds { 2661da177e4SLinus Torvalds uint32_t *p; 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 2691da177e4SLinus Torvalds return 0; 2701da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 8); 2711da177e4SLinus Torvalds if (unlikely(p == 0)) 2721da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 2731da177e4SLinus Torvalds p = xdr_encode_hyper(p, size); 2741da177e4SLinus Torvalds return 0; 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds static unsigned encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 2781da177e4SLinus Torvalds { 2791da177e4SLinus Torvalds uint32_t *p; 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 12); 2821da177e4SLinus Torvalds if (unlikely(p == 0)) 2831da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 2841da177e4SLinus Torvalds p = xdr_encode_hyper(p, time->tv_sec); 2851da177e4SLinus Torvalds *p = htonl(time->tv_nsec); 2861da177e4SLinus Torvalds return 0; 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds static unsigned encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 2901da177e4SLinus Torvalds { 2911da177e4SLinus Torvalds if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 2921da177e4SLinus Torvalds return 0; 2931da177e4SLinus Torvalds return encode_attr_time(xdr,time); 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds static unsigned encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 2971da177e4SLinus Torvalds { 2981da177e4SLinus Torvalds if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 2991da177e4SLinus Torvalds return 0; 3001da177e4SLinus Torvalds return encode_attr_time(xdr,time); 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds static unsigned encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 3041da177e4SLinus Torvalds { 3051da177e4SLinus Torvalds unsigned status; 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds hdr->status = xdr_reserve_space(xdr, 4); 3081da177e4SLinus Torvalds if (unlikely(hdr->status == NULL)) 3091da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 3101da177e4SLinus Torvalds status = encode_string(xdr, hdr->taglen, hdr->tag); 3111da177e4SLinus Torvalds if (unlikely(status != 0)) 3121da177e4SLinus Torvalds return status; 3131da177e4SLinus Torvalds hdr->nops = xdr_reserve_space(xdr, 4); 3141da177e4SLinus Torvalds if (unlikely(hdr->nops == NULL)) 3151da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 3161da177e4SLinus Torvalds return 0; 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds static unsigned encode_op_hdr(struct xdr_stream *xdr, uint32_t op, uint32_t res) 3201da177e4SLinus Torvalds { 3211da177e4SLinus Torvalds uint32_t *p; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 8); 3241da177e4SLinus Torvalds if (unlikely(p == NULL)) 3251da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 3261da177e4SLinus Torvalds *p++ = htonl(op); 3271da177e4SLinus Torvalds *p = res; 3281da177e4SLinus Torvalds return 0; 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds static unsigned encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 3321da177e4SLinus Torvalds { 333a162a6b8STrond Myklebust uint32_t *savep = NULL; 3341da177e4SLinus Torvalds unsigned status = res->status; 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds if (unlikely(status != 0)) 3371da177e4SLinus Torvalds goto out; 3381da177e4SLinus Torvalds status = encode_attr_bitmap(xdr, res->bitmap, &savep); 3391da177e4SLinus Torvalds if (unlikely(status != 0)) 3401da177e4SLinus Torvalds goto out; 3411da177e4SLinus Torvalds status = encode_attr_change(xdr, res->bitmap, res->change_attr); 3421da177e4SLinus Torvalds if (unlikely(status != 0)) 3431da177e4SLinus Torvalds goto out; 3441da177e4SLinus Torvalds status = encode_attr_size(xdr, res->bitmap, res->size); 3451da177e4SLinus Torvalds if (unlikely(status != 0)) 3461da177e4SLinus Torvalds goto out; 3471da177e4SLinus Torvalds status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 3481da177e4SLinus Torvalds if (unlikely(status != 0)) 3491da177e4SLinus Torvalds goto out; 3501da177e4SLinus Torvalds status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 3511da177e4SLinus Torvalds *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 3521da177e4SLinus Torvalds out: 3531da177e4SLinus Torvalds dprintk("%s: exit with status = %d\n", __FUNCTION__, status); 3541da177e4SLinus Torvalds return status; 3551da177e4SLinus Torvalds } 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds static unsigned process_op(struct svc_rqst *rqstp, 3581da177e4SLinus Torvalds struct xdr_stream *xdr_in, void *argp, 3591da177e4SLinus Torvalds struct xdr_stream *xdr_out, void *resp) 3601da177e4SLinus Torvalds { 361a162a6b8STrond Myklebust struct callback_op *op = &callback_ops[0]; 362a162a6b8STrond Myklebust unsigned int op_nr = OP_CB_ILLEGAL; 3631da177e4SLinus Torvalds unsigned int status = 0; 3641da177e4SLinus Torvalds long maxlen; 3651da177e4SLinus Torvalds unsigned res; 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds dprintk("%s: start\n", __FUNCTION__); 3681da177e4SLinus Torvalds status = decode_op_hdr(xdr_in, &op_nr); 369a162a6b8STrond Myklebust if (likely(status == 0)) { 370a162a6b8STrond Myklebust switch (op_nr) { 371a162a6b8STrond Myklebust case OP_CB_GETATTR: 372a162a6b8STrond Myklebust case OP_CB_RECALL: 373a162a6b8STrond Myklebust op = &callback_ops[op_nr]; 374a162a6b8STrond Myklebust break; 375a162a6b8STrond Myklebust default: 3761da177e4SLinus Torvalds op_nr = OP_CB_ILLEGAL; 3771da177e4SLinus Torvalds op = &callback_ops[0]; 3781da177e4SLinus Torvalds status = htonl(NFS4ERR_OP_ILLEGAL); 379a162a6b8STrond Myklebust } 380a162a6b8STrond Myklebust } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds maxlen = xdr_out->end - xdr_out->p; 3831da177e4SLinus Torvalds if (maxlen > 0 && maxlen < PAGE_SIZE) { 3841da177e4SLinus Torvalds if (likely(status == 0 && op->decode_args != NULL)) 3851da177e4SLinus Torvalds status = op->decode_args(rqstp, xdr_in, argp); 3861da177e4SLinus Torvalds if (likely(status == 0 && op->process_op != NULL)) 3871da177e4SLinus Torvalds status = op->process_op(argp, resp); 3881da177e4SLinus Torvalds } else 3891da177e4SLinus Torvalds status = htonl(NFS4ERR_RESOURCE); 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds res = encode_op_hdr(xdr_out, op_nr, status); 3921da177e4SLinus Torvalds if (status == 0) 3931da177e4SLinus Torvalds status = res; 3941da177e4SLinus Torvalds if (op->encode_res != NULL && status == 0) 3951da177e4SLinus Torvalds status = op->encode_res(rqstp, xdr_out, resp); 3961da177e4SLinus Torvalds dprintk("%s: done, status = %d\n", __FUNCTION__, status); 3971da177e4SLinus Torvalds return status; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds /* 4011da177e4SLinus Torvalds * Decode, process and encode a COMPOUND 4021da177e4SLinus Torvalds */ 4031da177e4SLinus Torvalds static int nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 4041da177e4SLinus Torvalds { 4051da177e4SLinus Torvalds struct cb_compound_hdr_arg hdr_arg; 4061da177e4SLinus Torvalds struct cb_compound_hdr_res hdr_res; 4071da177e4SLinus Torvalds struct xdr_stream xdr_in, xdr_out; 4081da177e4SLinus Torvalds uint32_t *p; 4091da177e4SLinus Torvalds unsigned int status; 4101da177e4SLinus Torvalds unsigned int nops = 1; 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds dprintk("%s: start\n", __FUNCTION__); 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds p = (uint32_t*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 4171da177e4SLinus Torvalds xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds decode_compound_hdr_arg(&xdr_in, &hdr_arg); 4201da177e4SLinus Torvalds hdr_res.taglen = hdr_arg.taglen; 4211da177e4SLinus Torvalds hdr_res.tag = hdr_arg.tag; 422a162a6b8STrond Myklebust hdr_res.nops = NULL; 4231da177e4SLinus Torvalds encode_compound_hdr_res(&xdr_out, &hdr_res); 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds for (;;) { 4261da177e4SLinus Torvalds status = process_op(rqstp, &xdr_in, argp, &xdr_out, resp); 4271da177e4SLinus Torvalds if (status != 0) 4281da177e4SLinus Torvalds break; 4291da177e4SLinus Torvalds if (nops == hdr_arg.nops) 4301da177e4SLinus Torvalds break; 4311da177e4SLinus Torvalds nops++; 4321da177e4SLinus Torvalds } 4331da177e4SLinus Torvalds *hdr_res.status = status; 4341da177e4SLinus Torvalds *hdr_res.nops = htonl(nops); 4351da177e4SLinus Torvalds dprintk("%s: done, status = %u\n", __FUNCTION__, status); 4361da177e4SLinus Torvalds return rpc_success; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds /* 4401da177e4SLinus Torvalds * Define NFS4 callback COMPOUND ops. 4411da177e4SLinus Torvalds */ 4421da177e4SLinus Torvalds static struct callback_op callback_ops[] = { 4431da177e4SLinus Torvalds [0] = { 4441da177e4SLinus Torvalds .res_maxsize = CB_OP_HDR_RES_MAXSZ, 4451da177e4SLinus Torvalds }, 4461da177e4SLinus Torvalds [OP_CB_GETATTR] = { 4471da177e4SLinus Torvalds .process_op = (callback_process_op_t)nfs4_callback_getattr, 4481da177e4SLinus Torvalds .decode_args = (callback_decode_arg_t)decode_getattr_args, 4491da177e4SLinus Torvalds .encode_res = (callback_encode_res_t)encode_getattr_res, 4501da177e4SLinus Torvalds .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 4511da177e4SLinus Torvalds }, 4521da177e4SLinus Torvalds [OP_CB_RECALL] = { 4531da177e4SLinus Torvalds .process_op = (callback_process_op_t)nfs4_callback_recall, 4541da177e4SLinus Torvalds .decode_args = (callback_decode_arg_t)decode_recall_args, 4551da177e4SLinus Torvalds .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds }; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds /* 4601da177e4SLinus Torvalds * Define NFS4 callback procedures 4611da177e4SLinus Torvalds */ 4621da177e4SLinus Torvalds static struct svc_procedure nfs4_callback_procedures1[] = { 4631da177e4SLinus Torvalds [CB_NULL] = { 4641da177e4SLinus Torvalds .pc_func = nfs4_callback_null, 4651da177e4SLinus Torvalds .pc_decode = (kxdrproc_t)nfs4_decode_void, 4661da177e4SLinus Torvalds .pc_encode = (kxdrproc_t)nfs4_encode_void, 4671da177e4SLinus Torvalds .pc_xdrressize = 1, 4681da177e4SLinus Torvalds }, 4691da177e4SLinus Torvalds [CB_COMPOUND] = { 4701da177e4SLinus Torvalds .pc_func = nfs4_callback_compound, 4711da177e4SLinus Torvalds .pc_encode = (kxdrproc_t)nfs4_encode_void, 4721da177e4SLinus Torvalds .pc_argsize = 256, 4731da177e4SLinus Torvalds .pc_ressize = 256, 4741da177e4SLinus Torvalds .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds }; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds struct svc_version nfs4_callback_version1 = { 4791da177e4SLinus Torvalds .vs_vers = 1, 4801da177e4SLinus Torvalds .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 4811da177e4SLinus Torvalds .vs_proc = nfs4_callback_procedures1, 4821da177e4SLinus Torvalds .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 4831da177e4SLinus Torvalds .vs_dispatch = NULL, 4841da177e4SLinus Torvalds }; 4851da177e4SLinus Torvalds 486