fs/nfsd/nfs3xdr.c

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This source file includes following definitions.
encode_time3
decode_time3
decode_fh
nfs3svc_decode_fh
encode_fh
decode_filename
decode_sattr3
encode_fsid
encode_fattr3
encode_saved_post_attr
encode_post_op_attr
nfs3svc_encode_post_op_attr
encode_wcc_data
fill_pre_wcc
fill_post_wcc
nfs3svc_decode_fhandle
nfs3svc_decode_sattrargs
nfs3svc_decode_diropargs
nfs3svc_decode_accessargs
nfs3svc_decode_readargs
nfs3svc_decode_writeargs
nfs3svc_decode_createargs
nfs3svc_decode_mkdirargs
nfs3svc_decode_symlinkargs
nfs3svc_decode_mknodargs
nfs3svc_decode_renameargs
nfs3svc_decode_readlinkargs
nfs3svc_decode_linkargs
nfs3svc_decode_readdirargs
nfs3svc_decode_readdirplusargs
nfs3svc_decode_commitargs
nfs3svc_encode_voidres
nfs3svc_encode_attrstat
nfs3svc_encode_wccstat
nfs3svc_encode_diropres
nfs3svc_encode_accessres
nfs3svc_encode_readlinkres
nfs3svc_encode_readres
nfs3svc_encode_writeres
nfs3svc_encode_createres
nfs3svc_encode_renameres
nfs3svc_encode_linkres
nfs3svc_encode_readdirres
encode_entry_baggage
compose_entry_fh
encode_entryplus_baggage
encode_entry
nfs3svc_encode_entry
nfs3svc_encode_entry_plus
nfs3svc_encode_fsstatres
nfs3svc_encode_fsinfores
nfs3svc_encode_pathconfres
nfs3svc_encode_commitres
nfs3svc_release_fhandle
nfs3svc_release_fhandle2
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * XDR support for nfsd/protocol version 3.
   4  *
   5  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   6  *
   7  * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
   8  */
   9 
  10 #include <linux/namei.h>
  11 #include <linux/sunrpc/svc_xprt.h>
  12 #include "xdr3.h"
  13 #include "auth.h"
  14 #include "netns.h"
  15 #include "vfs.h"
  16 
  17 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  18 
  19 
  20 /*
  21  * Mapping of S_IF* types to NFS file types
  22  */
  23 static u32      nfs3_ftypes[] = {
  24         NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
  25         NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
  26         NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
  27         NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
  28 };
  29 
  30 
  31 /*
  32  * XDR functions for basic NFS types
  33  */
  34 static __be32 *
  35 encode_time3(__be32 *p, struct timespec *time)
  36 {
  37         *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
  38         return p;
  39 }
  40 
  41 static __be32 *
  42 decode_time3(__be32 *p, struct timespec *time)
  43 {
  44         time->tv_sec = ntohl(*p++);
  45         time->tv_nsec = ntohl(*p++);
  46         return p;
  47 }
  48 
  49 static __be32 *
  50 decode_fh(__be32 *p, struct svc_fh *fhp)
  51 {
  52         unsigned int size;
  53         fh_init(fhp, NFS3_FHSIZE);
  54         size = ntohl(*p++);
  55         if (size > NFS3_FHSIZE)
  56                 return NULL;
  57 
  58         memcpy(&fhp->fh_handle.fh_base, p, size);
  59         fhp->fh_handle.fh_size = size;
  60         return p + XDR_QUADLEN(size);
  61 }
  62 
  63 /* Helper function for NFSv3 ACL code */
  64 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
  65 {
  66         return decode_fh(p, fhp);
  67 }
  68 
  69 static __be32 *
  70 encode_fh(__be32 *p, struct svc_fh *fhp)
  71 {
  72         unsigned int size = fhp->fh_handle.fh_size;
  73         *p++ = htonl(size);
  74         if (size) p[XDR_QUADLEN(size)-1]=0;
  75         memcpy(p, &fhp->fh_handle.fh_base, size);
  76         return p + XDR_QUADLEN(size);
  77 }
  78 
  79 /*
  80  * Decode a file name and make sure that the path contains
  81  * no slashes or null bytes.
  82  */
  83 static __be32 *
  84 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
  85 {
  86         char            *name;
  87         unsigned int    i;
  88 
  89         if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
  90                 for (i = 0, name = *namp; i < *lenp; i++, name++) {
  91                         if (*name == '\0' || *name == '/')
  92                                 return NULL;
  93                 }
  94         }
  95 
  96         return p;
  97 }
  98 
  99 static __be32 *
 100 decode_sattr3(__be32 *p, struct iattr *iap, struct user_namespace *userns)
 101 {
 102         u32     tmp;
 103 
 104         iap->ia_valid = 0;
 105 
 106         if (*p++) {
 107                 iap->ia_valid |= ATTR_MODE;
 108                 iap->ia_mode = ntohl(*p++);
 109         }
 110         if (*p++) {
 111                 iap->ia_uid = make_kuid(userns, ntohl(*p++));
 112                 if (uid_valid(iap->ia_uid))
 113                         iap->ia_valid |= ATTR_UID;
 114         }
 115         if (*p++) {
 116                 iap->ia_gid = make_kgid(userns, ntohl(*p++));
 117                 if (gid_valid(iap->ia_gid))
 118                         iap->ia_valid |= ATTR_GID;
 119         }
 120         if (*p++) {
 121                 u64     newsize;
 122 
 123                 iap->ia_valid |= ATTR_SIZE;
 124                 p = xdr_decode_hyper(p, &newsize);
 125                 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
 126         }
 127         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 128                 iap->ia_valid |= ATTR_ATIME;
 129         } else if (tmp == 2) {          /* set to client time */
 130                 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 131                 iap->ia_atime.tv_sec = ntohl(*p++);
 132                 iap->ia_atime.tv_nsec = ntohl(*p++);
 133         }
 134         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 135                 iap->ia_valid |= ATTR_MTIME;
 136         } else if (tmp == 2) {          /* set to client time */
 137                 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
 138                 iap->ia_mtime.tv_sec = ntohl(*p++);
 139                 iap->ia_mtime.tv_nsec = ntohl(*p++);
 140         }
 141         return p;
 142 }
 143 
 144 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
 145 {
 146         u64 f;
 147         switch(fsid_source(fhp)) {
 148         default:
 149         case FSIDSOURCE_DEV:
 150                 p = xdr_encode_hyper(p, (u64)huge_encode_dev
 151                                      (fhp->fh_dentry->d_sb->s_dev));
 152                 break;
 153         case FSIDSOURCE_FSID:
 154                 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
 155                 break;
 156         case FSIDSOURCE_UUID:
 157                 f = ((u64*)fhp->fh_export->ex_uuid)[0];
 158                 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
 159                 p = xdr_encode_hyper(p, f);
 160                 break;
 161         }
 162         return p;
 163 }
 164 
 165 static __be32 *
 166 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
 167               struct kstat *stat)
 168 {
 169         struct user_namespace *userns = nfsd_user_namespace(rqstp);
 170         struct timespec ts;
 171         *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
 172         *p++ = htonl((u32) (stat->mode & S_IALLUGO));
 173         *p++ = htonl((u32) stat->nlink);
 174         *p++ = htonl((u32) from_kuid_munged(userns, stat->uid));
 175         *p++ = htonl((u32) from_kgid_munged(userns, stat->gid));
 176         if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
 177                 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
 178         } else {
 179                 p = xdr_encode_hyper(p, (u64) stat->size);
 180         }
 181         p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
 182         *p++ = htonl((u32) MAJOR(stat->rdev));
 183         *p++ = htonl((u32) MINOR(stat->rdev));
 184         p = encode_fsid(p, fhp);
 185         p = xdr_encode_hyper(p, stat->ino);
 186         ts = timespec64_to_timespec(stat->atime);
 187         p = encode_time3(p, &ts);
 188         ts = timespec64_to_timespec(stat->mtime);
 189         p = encode_time3(p, &ts);
 190         ts = timespec64_to_timespec(stat->ctime);
 191         p = encode_time3(p, &ts);
 192 
 193         return p;
 194 }
 195 
 196 static __be32 *
 197 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 198 {
 199         /* Attributes to follow */
 200         *p++ = xdr_one;
 201         return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
 202 }
 203 
 204 /*
 205  * Encode post-operation attributes.
 206  * The inode may be NULL if the call failed because of a stale file
 207  * handle. In this case, no attributes are returned.
 208  */
 209 static __be32 *
 210 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 211 {
 212         struct dentry *dentry = fhp->fh_dentry;
 213         if (dentry && d_really_is_positive(dentry)) {
 214                 __be32 err;
 215                 struct kstat stat;
 216 
 217                 err = fh_getattr(fhp, &stat);
 218                 if (!err) {
 219                         *p++ = xdr_one;         /* attributes follow */
 220                         lease_get_mtime(d_inode(dentry), &stat.mtime);
 221                         return encode_fattr3(rqstp, p, fhp, &stat);
 222                 }
 223         }
 224         *p++ = xdr_zero;
 225         return p;
 226 }
 227 
 228 /* Helper for NFSv3 ACLs */
 229 __be32 *
 230 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 231 {
 232         return encode_post_op_attr(rqstp, p, fhp);
 233 }
 234 
 235 /*
 236  * Enocde weak cache consistency data
 237  */
 238 static __be32 *
 239 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 240 {
 241         struct dentry   *dentry = fhp->fh_dentry;
 242 
 243         if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
 244                 if (fhp->fh_pre_saved) {
 245                         *p++ = xdr_one;
 246                         p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
 247                         p = encode_time3(p, &fhp->fh_pre_mtime);
 248                         p = encode_time3(p, &fhp->fh_pre_ctime);
 249                 } else {
 250                         *p++ = xdr_zero;
 251                 }
 252                 return encode_saved_post_attr(rqstp, p, fhp);
 253         }
 254         /* no pre- or post-attrs */
 255         *p++ = xdr_zero;
 256         return encode_post_op_attr(rqstp, p, fhp);
 257 }
 258 
 259 /*
 260  * Fill in the pre_op attr for the wcc data
 261  */
 262 void fill_pre_wcc(struct svc_fh *fhp)
 263 {
 264         struct inode    *inode;
 265         struct kstat    stat;
 266         __be32 err;
 267 
 268         if (fhp->fh_pre_saved)
 269                 return;
 270 
 271         inode = d_inode(fhp->fh_dentry);
 272         err = fh_getattr(fhp, &stat);
 273         if (err) {
 274                 /* Grab the times from inode anyway */
 275                 stat.mtime = inode->i_mtime;
 276                 stat.ctime = inode->i_ctime;
 277                 stat.size  = inode->i_size;
 278         }
 279 
 280         fhp->fh_pre_mtime = timespec64_to_timespec(stat.mtime);
 281         fhp->fh_pre_ctime = timespec64_to_timespec(stat.ctime);
 282         fhp->fh_pre_size  = stat.size;
 283         fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
 284         fhp->fh_pre_saved = true;
 285 }
 286 
 287 /*
 288  * Fill in the post_op attr for the wcc data
 289  */
 290 void fill_post_wcc(struct svc_fh *fhp)
 291 {
 292         __be32 err;
 293 
 294         if (fhp->fh_post_saved)
 295                 printk("nfsd: inode locked twice during operation.\n");
 296 
 297         err = fh_getattr(fhp, &fhp->fh_post_attr);
 298         fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr,
 299                                                      d_inode(fhp->fh_dentry));
 300         if (err) {
 301                 fhp->fh_post_saved = false;
 302                 /* Grab the ctime anyway - set_change_info might use it */
 303                 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
 304         } else
 305                 fhp->fh_post_saved = true;
 306 }
 307 
 308 /*
 309  * XDR decode functions
 310  */
 311 int
 312 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
 313 {
 314         struct nfsd_fhandle *args = rqstp->rq_argp;
 315 
 316         p = decode_fh(p, &args->fh);
 317         if (!p)
 318                 return 0;
 319         return xdr_argsize_check(rqstp, p);
 320 }
 321 
 322 int
 323 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
 324 {
 325         struct nfsd3_sattrargs *args = rqstp->rq_argp;
 326 
 327         p = decode_fh(p, &args->fh);
 328         if (!p)
 329                 return 0;
 330         p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
 331 
 332         if ((args->check_guard = ntohl(*p++)) != 0) { 
 333                 struct timespec time; 
 334                 p = decode_time3(p, &time);
 335                 args->guardtime = time.tv_sec;
 336         }
 337 
 338         return xdr_argsize_check(rqstp, p);
 339 }
 340 
 341 int
 342 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
 343 {
 344         struct nfsd3_diropargs *args = rqstp->rq_argp;
 345 
 346         if (!(p = decode_fh(p, &args->fh))
 347          || !(p = decode_filename(p, &args->name, &args->len)))
 348                 return 0;
 349 
 350         return xdr_argsize_check(rqstp, p);
 351 }
 352 
 353 int
 354 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
 355 {
 356         struct nfsd3_accessargs *args = rqstp->rq_argp;
 357 
 358         p = decode_fh(p, &args->fh);
 359         if (!p)
 360                 return 0;
 361         args->access = ntohl(*p++);
 362 
 363         return xdr_argsize_check(rqstp, p);
 364 }
 365 
 366 int
 367 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
 368 {
 369         struct nfsd3_readargs *args = rqstp->rq_argp;
 370         unsigned int len;
 371         int v;
 372         u32 max_blocksize = svc_max_payload(rqstp);
 373 
 374         p = decode_fh(p, &args->fh);
 375         if (!p)
 376                 return 0;
 377         p = xdr_decode_hyper(p, &args->offset);
 378 
 379         args->count = ntohl(*p++);
 380         len = min(args->count, max_blocksize);
 381 
 382         /* set up the kvec */
 383         v=0;
 384         while (len > 0) {
 385                 struct page *p = *(rqstp->rq_next_page++);
 386 
 387                 rqstp->rq_vec[v].iov_base = page_address(p);
 388                 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
 389                 len -= rqstp->rq_vec[v].iov_len;
 390                 v++;
 391         }
 392         args->vlen = v;
 393         return xdr_argsize_check(rqstp, p);
 394 }
 395 
 396 int
 397 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
 398 {
 399         struct nfsd3_writeargs *args = rqstp->rq_argp;
 400         unsigned int len, hdr, dlen;
 401         u32 max_blocksize = svc_max_payload(rqstp);
 402         struct kvec *head = rqstp->rq_arg.head;
 403         struct kvec *tail = rqstp->rq_arg.tail;
 404 
 405         p = decode_fh(p, &args->fh);
 406         if (!p)
 407                 return 0;
 408         p = xdr_decode_hyper(p, &args->offset);
 409 
 410         args->count = ntohl(*p++);
 411         args->stable = ntohl(*p++);
 412         len = args->len = ntohl(*p++);
 413         if ((void *)p > head->iov_base + head->iov_len)
 414                 return 0;
 415         /*
 416          * The count must equal the amount of data passed.
 417          */
 418         if (args->count != args->len)
 419                 return 0;
 420 
 421         /*
 422          * Check to make sure that we got the right number of
 423          * bytes.
 424          */
 425         hdr = (void*)p - head->iov_base;
 426         dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
 427         /*
 428          * Round the length of the data which was specified up to
 429          * the next multiple of XDR units and then compare that
 430          * against the length which was actually received.
 431          * Note that when RPCSEC/GSS (for example) is used, the
 432          * data buffer can be padded so dlen might be larger
 433          * than required.  It must never be smaller.
 434          */
 435         if (dlen < XDR_QUADLEN(len)*4)
 436                 return 0;
 437 
 438         if (args->count > max_blocksize) {
 439                 args->count = max_blocksize;
 440                 len = args->len = max_blocksize;
 441         }
 442 
 443         args->first.iov_base = (void *)p;
 444         args->first.iov_len = head->iov_len - hdr;
 445         return 1;
 446 }
 447 
 448 int
 449 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
 450 {
 451         struct nfsd3_createargs *args = rqstp->rq_argp;
 452 
 453         if (!(p = decode_fh(p, &args->fh))
 454          || !(p = decode_filename(p, &args->name, &args->len)))
 455                 return 0;
 456 
 457         switch (args->createmode = ntohl(*p++)) {
 458         case NFS3_CREATE_UNCHECKED:
 459         case NFS3_CREATE_GUARDED:
 460                 p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
 461                 break;
 462         case NFS3_CREATE_EXCLUSIVE:
 463                 args->verf = p;
 464                 p += 2;
 465                 break;
 466         default:
 467                 return 0;
 468         }
 469 
 470         return xdr_argsize_check(rqstp, p);
 471 }
 472 
 473 int
 474 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
 475 {
 476         struct nfsd3_createargs *args = rqstp->rq_argp;
 477 
 478         if (!(p = decode_fh(p, &args->fh)) ||
 479             !(p = decode_filename(p, &args->name, &args->len)))
 480                 return 0;
 481         p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
 482 
 483         return xdr_argsize_check(rqstp, p);
 484 }
 485 
 486 int
 487 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
 488 {
 489         struct nfsd3_symlinkargs *args = rqstp->rq_argp;
 490         char *base = (char *)p;
 491         size_t dlen;
 492 
 493         if (!(p = decode_fh(p, &args->ffh)) ||
 494             !(p = decode_filename(p, &args->fname, &args->flen)))
 495                 return 0;
 496         p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
 497 
 498         args->tlen = ntohl(*p++);
 499 
 500         args->first.iov_base = p;
 501         args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
 502         args->first.iov_len -= (char *)p - base;
 503 
 504         dlen = args->first.iov_len + rqstp->rq_arg.page_len +
 505                rqstp->rq_arg.tail[0].iov_len;
 506         if (dlen < XDR_QUADLEN(args->tlen) << 2)
 507                 return 0;
 508         return 1;
 509 }
 510 
 511 int
 512 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
 513 {
 514         struct nfsd3_mknodargs *args = rqstp->rq_argp;
 515 
 516         if (!(p = decode_fh(p, &args->fh))
 517          || !(p = decode_filename(p, &args->name, &args->len)))
 518                 return 0;
 519 
 520         args->ftype = ntohl(*p++);
 521 
 522         if (args->ftype == NF3BLK  || args->ftype == NF3CHR
 523          || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
 524                 p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
 525 
 526         if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
 527                 args->major = ntohl(*p++);
 528                 args->minor = ntohl(*p++);
 529         }
 530 
 531         return xdr_argsize_check(rqstp, p);
 532 }
 533 
 534 int
 535 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
 536 {
 537         struct nfsd3_renameargs *args = rqstp->rq_argp;
 538 
 539         if (!(p = decode_fh(p, &args->ffh))
 540          || !(p = decode_filename(p, &args->fname, &args->flen))
 541          || !(p = decode_fh(p, &args->tfh))
 542          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 543                 return 0;
 544 
 545         return xdr_argsize_check(rqstp, p);
 546 }
 547 
 548 int
 549 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
 550 {
 551         struct nfsd3_readlinkargs *args = rqstp->rq_argp;
 552 
 553         p = decode_fh(p, &args->fh);
 554         if (!p)
 555                 return 0;
 556         args->buffer = page_address(*(rqstp->rq_next_page++));
 557 
 558         return xdr_argsize_check(rqstp, p);
 559 }
 560 
 561 int
 562 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
 563 {
 564         struct nfsd3_linkargs *args = rqstp->rq_argp;
 565 
 566         if (!(p = decode_fh(p, &args->ffh))
 567          || !(p = decode_fh(p, &args->tfh))
 568          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 569                 return 0;
 570 
 571         return xdr_argsize_check(rqstp, p);
 572 }
 573 
 574 int
 575 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
 576 {
 577         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 578         int len;
 579         u32 max_blocksize = svc_max_payload(rqstp);
 580 
 581         p = decode_fh(p, &args->fh);
 582         if (!p)
 583                 return 0;
 584         p = xdr_decode_hyper(p, &args->cookie);
 585         args->verf   = p; p += 2;
 586         args->dircount = ~0;
 587         args->count  = ntohl(*p++);
 588         len = args->count  = min_t(u32, args->count, max_blocksize);
 589 
 590         while (len > 0) {
 591                 struct page *p = *(rqstp->rq_next_page++);
 592                 if (!args->buffer)
 593                         args->buffer = page_address(p);
 594                 len -= PAGE_SIZE;
 595         }
 596 
 597         return xdr_argsize_check(rqstp, p);
 598 }
 599 
 600 int
 601 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
 602 {
 603         struct nfsd3_readdirargs *args = rqstp->rq_argp;
 604         int len;
 605         u32 max_blocksize = svc_max_payload(rqstp);
 606 
 607         p = decode_fh(p, &args->fh);
 608         if (!p)
 609                 return 0;
 610         p = xdr_decode_hyper(p, &args->cookie);
 611         args->verf     = p; p += 2;
 612         args->dircount = ntohl(*p++);
 613         args->count    = ntohl(*p++);
 614 
 615         len = args->count = min(args->count, max_blocksize);
 616         while (len > 0) {
 617                 struct page *p = *(rqstp->rq_next_page++);
 618                 if (!args->buffer)
 619                         args->buffer = page_address(p);
 620                 len -= PAGE_SIZE;
 621         }
 622 
 623         return xdr_argsize_check(rqstp, p);
 624 }
 625 
 626 int
 627 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
 628 {
 629         struct nfsd3_commitargs *args = rqstp->rq_argp;
 630         p = decode_fh(p, &args->fh);
 631         if (!p)
 632                 return 0;
 633         p = xdr_decode_hyper(p, &args->offset);
 634         args->count = ntohl(*p++);
 635 
 636         return xdr_argsize_check(rqstp, p);
 637 }
 638 
 639 /*
 640  * XDR encode functions
 641  */
 642 /*
 643  * There must be an encoding function for void results so svc_process
 644  * will work properly.
 645  */
 646 int
 647 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
 648 {
 649         return xdr_ressize_check(rqstp, p);
 650 }
 651 
 652 /* GETATTR */
 653 int
 654 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
 655 {
 656         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 657 
 658         if (resp->status == 0) {
 659                 lease_get_mtime(d_inode(resp->fh.fh_dentry),
 660                                 &resp->stat.mtime);
 661                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
 662         }
 663         return xdr_ressize_check(rqstp, p);
 664 }
 665 
 666 /* SETATTR, REMOVE, RMDIR */
 667 int
 668 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
 669 {
 670         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 671 
 672         p = encode_wcc_data(rqstp, p, &resp->fh);
 673         return xdr_ressize_check(rqstp, p);
 674 }
 675 
 676 /* LOOKUP */
 677 int
 678 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
 679 {
 680         struct nfsd3_diropres *resp = rqstp->rq_resp;
 681 
 682         if (resp->status == 0) {
 683                 p = encode_fh(p, &resp->fh);
 684                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 685         }
 686         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
 687         return xdr_ressize_check(rqstp, p);
 688 }
 689 
 690 /* ACCESS */
 691 int
 692 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
 693 {
 694         struct nfsd3_accessres *resp = rqstp->rq_resp;
 695 
 696         p = encode_post_op_attr(rqstp, p, &resp->fh);
 697         if (resp->status == 0)
 698                 *p++ = htonl(resp->access);
 699         return xdr_ressize_check(rqstp, p);
 700 }
 701 
 702 /* READLINK */
 703 int
 704 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
 705 {
 706         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 707 
 708         p = encode_post_op_attr(rqstp, p, &resp->fh);
 709         if (resp->status == 0) {
 710                 *p++ = htonl(resp->len);
 711                 xdr_ressize_check(rqstp, p);
 712                 rqstp->rq_res.page_len = resp->len;
 713                 if (resp->len & 3) {
 714                         /* need to pad the tail */
 715                         rqstp->rq_res.tail[0].iov_base = p;
 716                         *p = 0;
 717                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
 718                 }
 719                 return 1;
 720         } else
 721                 return xdr_ressize_check(rqstp, p);
 722 }
 723 
 724 /* READ */
 725 int
 726 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
 727 {
 728         struct nfsd3_readres *resp = rqstp->rq_resp;
 729 
 730         p = encode_post_op_attr(rqstp, p, &resp->fh);
 731         if (resp->status == 0) {
 732                 *p++ = htonl(resp->count);
 733                 *p++ = htonl(resp->eof);
 734                 *p++ = htonl(resp->count);      /* xdr opaque count */
 735                 xdr_ressize_check(rqstp, p);
 736                 /* now update rqstp->rq_res to reflect data as well */
 737                 rqstp->rq_res.page_len = resp->count;
 738                 if (resp->count & 3) {
 739                         /* need to pad the tail */
 740                         rqstp->rq_res.tail[0].iov_base = p;
 741                         *p = 0;
 742                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
 743                 }
 744                 return 1;
 745         } else
 746                 return xdr_ressize_check(rqstp, p);
 747 }
 748 
 749 /* WRITE */
 750 int
 751 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
 752 {
 753         struct nfsd3_writeres *resp = rqstp->rq_resp;
 754         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 755         __be32 verf[2];
 756 
 757         p = encode_wcc_data(rqstp, p, &resp->fh);
 758         if (resp->status == 0) {
 759                 *p++ = htonl(resp->count);
 760                 *p++ = htonl(resp->committed);
 761                 /* unique identifier, y2038 overflow can be ignored */
 762                 nfsd_copy_boot_verifier(verf, nn);
 763                 *p++ = verf[0];
 764                 *p++ = verf[1];
 765         }
 766         return xdr_ressize_check(rqstp, p);
 767 }
 768 
 769 /* CREATE, MKDIR, SYMLINK, MKNOD */
 770 int
 771 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
 772 {
 773         struct nfsd3_diropres *resp = rqstp->rq_resp;
 774 
 775         if (resp->status == 0) {
 776                 *p++ = xdr_one;
 777                 p = encode_fh(p, &resp->fh);
 778                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 779         }
 780         p = encode_wcc_data(rqstp, p, &resp->dirfh);
 781         return xdr_ressize_check(rqstp, p);
 782 }
 783 
 784 /* RENAME */
 785 int
 786 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
 787 {
 788         struct nfsd3_renameres *resp = rqstp->rq_resp;
 789 
 790         p = encode_wcc_data(rqstp, p, &resp->ffh);
 791         p = encode_wcc_data(rqstp, p, &resp->tfh);
 792         return xdr_ressize_check(rqstp, p);
 793 }
 794 
 795 /* LINK */
 796 int
 797 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
 798 {
 799         struct nfsd3_linkres *resp = rqstp->rq_resp;
 800 
 801         p = encode_post_op_attr(rqstp, p, &resp->fh);
 802         p = encode_wcc_data(rqstp, p, &resp->tfh);
 803         return xdr_ressize_check(rqstp, p);
 804 }
 805 
 806 /* READDIR */
 807 int
 808 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
 809 {
 810         struct nfsd3_readdirres *resp = rqstp->rq_resp;
 811 
 812         p = encode_post_op_attr(rqstp, p, &resp->fh);
 813 
 814         if (resp->status == 0) {
 815                 /* stupid readdir cookie */
 816                 memcpy(p, resp->verf, 8); p += 2;
 817                 xdr_ressize_check(rqstp, p);
 818                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
 819                         return 1; /*No room for trailer */
 820                 rqstp->rq_res.page_len = (resp->count) << 2;
 821 
 822                 /* add the 'tail' to the end of the 'head' page - page 0. */
 823                 rqstp->rq_res.tail[0].iov_base = p;
 824                 *p++ = 0;               /* no more entries */
 825                 *p++ = htonl(resp->common.err == nfserr_eof);
 826                 rqstp->rq_res.tail[0].iov_len = 2<<2;
 827                 return 1;
 828         } else
 829                 return xdr_ressize_check(rqstp, p);
 830 }
 831 
 832 static __be32 *
 833 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
 834              int namlen, u64 ino)
 835 {
 836         *p++ = xdr_one;                          /* mark entry present */
 837         p    = xdr_encode_hyper(p, ino);         /* file id */
 838         p    = xdr_encode_array(p, name, namlen);/* name length & name */
 839 
 840         cd->offset = p;                         /* remember pointer */
 841         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
 842 
 843         return p;
 844 }
 845 
 846 static __be32
 847 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
 848                  const char *name, int namlen, u64 ino)
 849 {
 850         struct svc_export       *exp;
 851         struct dentry           *dparent, *dchild;
 852         __be32 rv = nfserr_noent;
 853 
 854         dparent = cd->fh.fh_dentry;
 855         exp  = cd->fh.fh_export;
 856 
 857         if (isdotent(name, namlen)) {
 858                 if (namlen == 2) {
 859                         dchild = dget_parent(dparent);
 860                         /* filesystem root - cannot return filehandle for ".." */
 861                         if (dchild == dparent)
 862                                 goto out;
 863                 } else
 864                         dchild = dget(dparent);
 865         } else
 866                 dchild = lookup_one_len_unlocked(name, dparent, namlen);
 867         if (IS_ERR(dchild))
 868                 return rv;
 869         if (d_mountpoint(dchild))
 870                 goto out;
 871         if (d_really_is_negative(dchild))
 872                 goto out;
 873         if (dchild->d_inode->i_ino != ino)
 874                 goto out;
 875         rv = fh_compose(fhp, exp, dchild, &cd->fh);
 876 out:
 877         dput(dchild);
 878         return rv;
 879 }
 880 
 881 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
 882 {
 883         struct svc_fh   *fh = &cd->scratch;
 884         __be32 err;
 885 
 886         fh_init(fh, NFS3_FHSIZE);
 887         err = compose_entry_fh(cd, fh, name, namlen, ino);
 888         if (err) {
 889                 *p++ = 0;
 890                 *p++ = 0;
 891                 goto out;
 892         }
 893         p = encode_post_op_attr(cd->rqstp, p, fh);
 894         *p++ = xdr_one;                 /* yes, a file handle follows */
 895         p = encode_fh(p, fh);
 896 out:
 897         fh_put(fh);
 898         return p;
 899 }
 900 
 901 /*
 902  * Encode a directory entry. This one works for both normal readdir
 903  * and readdirplus.
 904  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 905  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 906  * 
 907  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 908  * file handle.
 909  */
 910 
 911 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
 912 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
 913 static int
 914 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 915              loff_t offset, u64 ino, unsigned int d_type, int plus)
 916 {
 917         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
 918                                                         common);
 919         __be32          *p = cd->buffer;
 920         caddr_t         curr_page_addr = NULL;
 921         struct page **  page;
 922         int             slen;           /* string (name) length */
 923         int             elen;           /* estimated entry length in words */
 924         int             num_entry_words = 0;    /* actual number of words */
 925 
 926         if (cd->offset) {
 927                 u64 offset64 = offset;
 928 
 929                 if (unlikely(cd->offset1)) {
 930                         /* we ended up with offset on a page boundary */
 931                         *cd->offset = htonl(offset64 >> 32);
 932                         *cd->offset1 = htonl(offset64 & 0xffffffff);
 933                         cd->offset1 = NULL;
 934                 } else {
 935                         xdr_encode_hyper(cd->offset, offset64);
 936                 }
 937                 cd->offset = NULL;
 938         }
 939 
 940         /*
 941         dprintk("encode_entry(%.*s @%ld%s)\n",
 942                 namlen, name, (long) offset, plus? " plus" : "");
 943          */
 944 
 945         /* truncate filename if too long */
 946         namlen = min(namlen, NFS3_MAXNAMLEN);
 947 
 948         slen = XDR_QUADLEN(namlen);
 949         elen = slen + NFS3_ENTRY_BAGGAGE
 950                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
 951 
 952         if (cd->buflen < elen) {
 953                 cd->common.err = nfserr_toosmall;
 954                 return -EINVAL;
 955         }
 956 
 957         /* determine which page in rq_respages[] we are currently filling */
 958         for (page = cd->rqstp->rq_respages + 1;
 959                                 page < cd->rqstp->rq_next_page; page++) {
 960                 curr_page_addr = page_address(*page);
 961 
 962                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
 963                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
 964                         break;
 965         }
 966 
 967         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
 968                 /* encode entry in current page */
 969 
 970                 p = encode_entry_baggage(cd, p, name, namlen, ino);
 971 
 972                 if (plus)
 973                         p = encode_entryplus_baggage(cd, p, name, namlen, ino);
 974                 num_entry_words = p - cd->buffer;
 975         } else if (*(page+1) != NULL) {
 976                 /* temporarily encode entry into next page, then move back to
 977                  * current and next page in rq_respages[] */
 978                 __be32 *p1, *tmp;
 979                 int len1, len2;
 980 
 981                 /* grab next page for temporary storage of entry */
 982                 p1 = tmp = page_address(*(page+1));
 983 
 984                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 985 
 986                 if (plus)
 987                         p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
 988 
 989                 /* determine entry word length and lengths to go in pages */
 990                 num_entry_words = p1 - tmp;
 991                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
 992                 if ((num_entry_words << 2) < len1) {
 993                         /* the actual number of words in the entry is less
 994                          * than elen and can still fit in the current page
 995                          */
 996                         memmove(p, tmp, num_entry_words << 2);
 997                         p += num_entry_words;
 998 
 999                         /* update offset */
1000                         cd->offset = cd->buffer + (cd->offset - tmp);
1001                 } else {
1002                         unsigned int offset_r = (cd->offset - tmp) << 2;
1003 
1004                         /* update pointer to offset location.
1005                          * This is a 64bit quantity, so we need to
1006                          * deal with 3 cases:
1007                          *  -   entirely in first page
1008                          *  -   entirely in second page
1009                          *  -   4 bytes in each page
1010                          */
1011                         if (offset_r + 8 <= len1) {
1012                                 cd->offset = p + (cd->offset - tmp);
1013                         } else if (offset_r >= len1) {
1014                                 cd->offset -= len1 >> 2;
1015                         } else {
1016                                 /* sitting on the fence */
1017                                 BUG_ON(offset_r != len1 - 4);
1018                                 cd->offset = p + (cd->offset - tmp);
1019                                 cd->offset1 = tmp;
1020                         }
1021 
1022                         len2 = (num_entry_words << 2) - len1;
1023 
1024                         /* move from temp page to current and next pages */
1025                         memmove(p, tmp, len1);
1026                         memmove(tmp, (caddr_t)tmp+len1, len2);
1027 
1028                         p = tmp + (len2 >> 2);
1029                 }
1030         }
1031         else {
1032                 cd->common.err = nfserr_toosmall;
1033                 return -EINVAL;
1034         }
1035 
1036         cd->buflen -= num_entry_words;
1037         cd->buffer = p;
1038         cd->common.err = nfs_ok;
1039         return 0;
1040 
1041 }
1042 
1043 int
1044 nfs3svc_encode_entry(void *cd, const char *name,
1045                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1046 {
1047         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1048 }
1049 
1050 int
1051 nfs3svc_encode_entry_plus(void *cd, const char *name,
1052                           int namlen, loff_t offset, u64 ino,
1053                           unsigned int d_type)
1054 {
1055         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1056 }
1057 
1058 /* FSSTAT */
1059 int
1060 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1061 {
1062         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1063         struct kstatfs  *s = &resp->stats;
1064         u64             bs = s->f_bsize;
1065 
1066         *p++ = xdr_zero;        /* no post_op_attr */
1067 
1068         if (resp->status == 0) {
1069                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1070                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1071                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1072                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1073                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1074                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1075                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1076         }
1077         return xdr_ressize_check(rqstp, p);
1078 }
1079 
1080 /* FSINFO */
1081 int
1082 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1083 {
1084         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1085 
1086         *p++ = xdr_zero;        /* no post_op_attr */
1087 
1088         if (resp->status == 0) {
1089                 *p++ = htonl(resp->f_rtmax);
1090                 *p++ = htonl(resp->f_rtpref);
1091                 *p++ = htonl(resp->f_rtmult);
1092                 *p++ = htonl(resp->f_wtmax);
1093                 *p++ = htonl(resp->f_wtpref);
1094                 *p++ = htonl(resp->f_wtmult);
1095                 *p++ = htonl(resp->f_dtpref);
1096                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1097                 *p++ = xdr_one;
1098                 *p++ = xdr_zero;
1099                 *p++ = htonl(resp->f_properties);
1100         }
1101 
1102         return xdr_ressize_check(rqstp, p);
1103 }
1104 
1105 /* PATHCONF */
1106 int
1107 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1108 {
1109         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1110 
1111         *p++ = xdr_zero;        /* no post_op_attr */
1112 
1113         if (resp->status == 0) {
1114                 *p++ = htonl(resp->p_link_max);
1115                 *p++ = htonl(resp->p_name_max);
1116                 *p++ = htonl(resp->p_no_trunc);
1117                 *p++ = htonl(resp->p_chown_restricted);
1118                 *p++ = htonl(resp->p_case_insensitive);
1119                 *p++ = htonl(resp->p_case_preserving);
1120         }
1121 
1122         return xdr_ressize_check(rqstp, p);
1123 }
1124 
1125 /* COMMIT */
1126 int
1127 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1128 {
1129         struct nfsd3_commitres *resp = rqstp->rq_resp;
1130         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1131         __be32 verf[2];
1132 
1133         p = encode_wcc_data(rqstp, p, &resp->fh);
1134         /* Write verifier */
1135         if (resp->status == 0) {
1136                 /* unique identifier, y2038 overflow can be ignored */
1137                 nfsd_copy_boot_verifier(verf, nn);
1138                 *p++ = verf[0];
1139                 *p++ = verf[1];
1140         }
1141         return xdr_ressize_check(rqstp, p);
1142 }
1143 
1144 /*
1145  * XDR release functions
1146  */
1147 void
1148 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1149 {
1150         struct nfsd3_attrstat *resp = rqstp->rq_resp;
1151 
1152         fh_put(&resp->fh);
1153 }
1154 
1155 void
1156 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1157 {
1158         struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
1159 
1160         fh_put(&resp->fh1);
1161         fh_put(&resp->fh2);
1162 }
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root/fs/nfsd/nfs3xdr.c

DEFINITIONS
