linux/fs/nfsd/export.c
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   1/*
   2 * NFS exporting and validation.
   3 *
   4 * We maintain a list of clients, each of which has a list of
   5 * exports. To export an fs to a given client, you first have
   6 * to create the client entry with NFSCTL_ADDCLIENT, which
   7 * creates a client control block and adds it to the hash
   8 * table. Then, you call NFSCTL_EXPORT for each fs.
   9 *
  10 *
  11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
  12 */
  13
  14#include <linux/slab.h>
  15#include <linux/namei.h>
  16#include <linux/module.h>
  17#include <linux/exportfs.h>
  18#include <linux/sunrpc/svc_xprt.h>
  19
  20#include "nfsd.h"
  21#include "nfsfh.h"
  22#include "netns.h"
  23#include "pnfs.h"
  24
  25#define NFSDDBG_FACILITY        NFSDDBG_EXPORT
  26
  27/*
  28 * We have two caches.
  29 * One maps client+vfsmnt+dentry to export options - the export map
  30 * The other maps client+filehandle-fragment to export options. - the expkey map
  31 *
  32 * The export options are actually stored in the first map, and the
  33 * second map contains a reference to the entry in the first map.
  34 */
  35
  36#define EXPKEY_HASHBITS         8
  37#define EXPKEY_HASHMAX          (1 << EXPKEY_HASHBITS)
  38#define EXPKEY_HASHMASK         (EXPKEY_HASHMAX -1)
  39
  40static void expkey_put(struct kref *ref)
  41{
  42        struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
  43
  44        if (test_bit(CACHE_VALID, &key->h.flags) &&
  45            !test_bit(CACHE_NEGATIVE, &key->h.flags))
  46                path_put(&key->ek_path);
  47        auth_domain_put(key->ek_client);
  48        kfree(key);
  49}
  50
  51static void expkey_request(struct cache_detail *cd,
  52                           struct cache_head *h,
  53                           char **bpp, int *blen)
  54{
  55        /* client fsidtype \xfsid */
  56        struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
  57        char type[5];
  58
  59        qword_add(bpp, blen, ek->ek_client->name);
  60        snprintf(type, 5, "%d", ek->ek_fsidtype);
  61        qword_add(bpp, blen, type);
  62        qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
  63        (*bpp)[-1] = '\n';
  64}
  65
  66static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
  67                                            struct svc_expkey *old);
  68static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
  69
  70static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
  71{
  72        /* client fsidtype fsid expiry [path] */
  73        char *buf;
  74        int len;
  75        struct auth_domain *dom = NULL;
  76        int err;
  77        int fsidtype;
  78        char *ep;
  79        struct svc_expkey key;
  80        struct svc_expkey *ek = NULL;
  81
  82        if (mesg[mlen - 1] != '\n')
  83                return -EINVAL;
  84        mesg[mlen-1] = 0;
  85
  86        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  87        err = -ENOMEM;
  88        if (!buf)
  89                goto out;
  90
  91        err = -EINVAL;
  92        if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
  93                goto out;
  94
  95        err = -ENOENT;
  96        dom = auth_domain_find(buf);
  97        if (!dom)
  98                goto out;
  99        dprintk("found domain %s\n", buf);
 100
 101        err = -EINVAL;
 102        if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
 103                goto out;
 104        fsidtype = simple_strtoul(buf, &ep, 10);
 105        if (*ep)
 106                goto out;
 107        dprintk("found fsidtype %d\n", fsidtype);
 108        if (key_len(fsidtype)==0) /* invalid type */
 109                goto out;
 110        if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
 111                goto out;
 112        dprintk("found fsid length %d\n", len);
 113        if (len != key_len(fsidtype))
 114                goto out;
 115
 116        /* OK, we seem to have a valid key */
 117        key.h.flags = 0;
 118        key.h.expiry_time = get_expiry(&mesg);
 119        if (key.h.expiry_time == 0)
 120                goto out;
 121
 122        key.ek_client = dom;    
 123        key.ek_fsidtype = fsidtype;
 124        memcpy(key.ek_fsid, buf, len);
 125
 126        ek = svc_expkey_lookup(cd, &key);
 127        err = -ENOMEM;
 128        if (!ek)
 129                goto out;
 130
 131        /* now we want a pathname, or empty meaning NEGATIVE  */
 132        err = -EINVAL;
 133        len = qword_get(&mesg, buf, PAGE_SIZE);
 134        if (len < 0)
 135                goto out;
 136        dprintk("Path seems to be <%s>\n", buf);
 137        err = 0;
 138        if (len == 0) {
 139                set_bit(CACHE_NEGATIVE, &key.h.flags);
 140                ek = svc_expkey_update(cd, &key, ek);
 141                if (!ek)
 142                        err = -ENOMEM;
 143        } else {
 144                err = kern_path(buf, 0, &key.ek_path);
 145                if (err)
 146                        goto out;
 147
 148                dprintk("Found the path %s\n", buf);
 149
 150                ek = svc_expkey_update(cd, &key, ek);
 151                if (!ek)
 152                        err = -ENOMEM;
 153                path_put(&key.ek_path);
 154        }
 155        cache_flush();
 156 out:
 157        if (ek)
 158                cache_put(&ek->h, cd);
 159        if (dom)
 160                auth_domain_put(dom);
 161        kfree(buf);
 162        return err;
 163}
 164
 165static int expkey_show(struct seq_file *m,
 166                       struct cache_detail *cd,
 167                       struct cache_head *h)
 168{
 169        struct svc_expkey *ek ;
 170        int i;
 171
 172        if (h ==NULL) {
 173                seq_puts(m, "#domain fsidtype fsid [path]\n");
 174                return 0;
 175        }
 176        ek = container_of(h, struct svc_expkey, h);
 177        seq_printf(m, "%s %d 0x", ek->ek_client->name,
 178                   ek->ek_fsidtype);
 179        for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
 180                seq_printf(m, "%08x", ek->ek_fsid[i]);
 181        if (test_bit(CACHE_VALID, &h->flags) && 
 182            !test_bit(CACHE_NEGATIVE, &h->flags)) {
 183                seq_printf(m, " ");
 184                seq_path(m, &ek->ek_path, "\\ \t\n");
 185        }
 186        seq_printf(m, "\n");
 187        return 0;
 188}
 189
 190static inline int expkey_match (struct cache_head *a, struct cache_head *b)
 191{
 192        struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
 193        struct svc_expkey *new = container_of(b, struct svc_expkey, h);
 194
 195        if (orig->ek_fsidtype != new->ek_fsidtype ||
 196            orig->ek_client != new->ek_client ||
 197            memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
 198                return 0;
 199        return 1;
 200}
 201
 202static inline void expkey_init(struct cache_head *cnew,
 203                                   struct cache_head *citem)
 204{
 205        struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
 206        struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
 207
 208        kref_get(&item->ek_client->ref);
 209        new->ek_client = item->ek_client;
 210        new->ek_fsidtype = item->ek_fsidtype;
 211
 212        memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
 213}
 214
 215static inline void expkey_update(struct cache_head *cnew,
 216                                   struct cache_head *citem)
 217{
 218        struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
 219        struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
 220
 221        new->ek_path = item->ek_path;
 222        path_get(&item->ek_path);
 223}
 224
 225static struct cache_head *expkey_alloc(void)
 226{
 227        struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
 228        if (i)
 229                return &i->h;
 230        else
 231                return NULL;
 232}
 233
 234static struct cache_detail svc_expkey_cache_template = {
 235        .owner          = THIS_MODULE,
 236        .hash_size      = EXPKEY_HASHMAX,
 237        .name           = "nfsd.fh",
 238        .cache_put      = expkey_put,
 239        .cache_request  = expkey_request,
 240        .cache_parse    = expkey_parse,
 241        .cache_show     = expkey_show,
 242        .match          = expkey_match,
 243        .init           = expkey_init,
 244        .update         = expkey_update,
 245        .alloc          = expkey_alloc,
 246};
 247
 248static int
 249svc_expkey_hash(struct svc_expkey *item)
 250{
 251        int hash = item->ek_fsidtype;
 252        char * cp = (char*)item->ek_fsid;
 253        int len = key_len(item->ek_fsidtype);
 254
 255        hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
 256        hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
 257        hash &= EXPKEY_HASHMASK;
 258        return hash;
 259}
 260
 261static struct svc_expkey *
 262svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
 263{
 264        struct cache_head *ch;
 265        int hash = svc_expkey_hash(item);
 266
 267        ch = sunrpc_cache_lookup(cd, &item->h, hash);
 268        if (ch)
 269                return container_of(ch, struct svc_expkey, h);
 270        else
 271                return NULL;
 272}
 273
 274static struct svc_expkey *
 275svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
 276                  struct svc_expkey *old)
 277{
 278        struct cache_head *ch;
 279        int hash = svc_expkey_hash(new);
 280
 281        ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
 282        if (ch)
 283                return container_of(ch, struct svc_expkey, h);
 284        else
 285                return NULL;
 286}
 287
 288
 289#define EXPORT_HASHBITS         8
 290#define EXPORT_HASHMAX          (1<< EXPORT_HASHBITS)
 291
 292static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
 293{
 294        struct nfsd4_fs_location *locations = fsloc->locations;
 295        int i;
 296
 297        if (!locations)
 298                return;
 299
 300        for (i = 0; i < fsloc->locations_count; i++) {
 301                kfree(locations[i].path);
 302                kfree(locations[i].hosts);
 303        }
 304
 305        kfree(locations);
 306        fsloc->locations = NULL;
 307}
 308
 309static void svc_export_put(struct kref *ref)
 310{
 311        struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
 312        path_put(&exp->ex_path);
 313        auth_domain_put(exp->ex_client);
 314        nfsd4_fslocs_free(&exp->ex_fslocs);
 315        kfree(exp->ex_uuid);
 316        kfree(exp);
 317}
 318
 319static void svc_export_request(struct cache_detail *cd,
 320                               struct cache_head *h,
 321                               char **bpp, int *blen)
 322{
 323        /*  client path */
 324        struct svc_export *exp = container_of(h, struct svc_export, h);
 325        char *pth;
 326
 327        qword_add(bpp, blen, exp->ex_client->name);
 328        pth = d_path(&exp->ex_path, *bpp, *blen);
 329        if (IS_ERR(pth)) {
 330                /* is this correct? */
 331                (*bpp)[0] = '\n';
 332                return;
 333        }
 334        qword_add(bpp, blen, pth);
 335        (*bpp)[-1] = '\n';
 336}
 337
 338static struct svc_export *svc_export_update(struct svc_export *new,
 339                                            struct svc_export *old);
 340static struct svc_export *svc_export_lookup(struct svc_export *);
 341
 342static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
 343{
 344
 345        /*
 346         * We currently export only dirs, regular files, and (for v4
 347         * pseudoroot) symlinks.
 348         */
 349        if (!S_ISDIR(inode->i_mode) &&
 350            !S_ISLNK(inode->i_mode) &&
 351            !S_ISREG(inode->i_mode))
 352                return -ENOTDIR;
 353
 354        /*
 355         * Mountd should never pass down a writeable V4ROOT export, but,
 356         * just to make sure:
 357         */
 358        if (*flags & NFSEXP_V4ROOT)
 359                *flags |= NFSEXP_READONLY;
 360
 361        /* There are two requirements on a filesystem to be exportable.
 362         * 1:  We must be able to identify the filesystem from a number.
 363         *       either a device number (so FS_REQUIRES_DEV needed)
 364         *       or an FSID number (so NFSEXP_FSID or ->uuid is needed).
 365         * 2:  We must be able to find an inode from a filehandle.
 366         *       This means that s_export_op must be set.
 367         */
 368        if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
 369            !(*flags & NFSEXP_FSID) &&
 370            uuid == NULL) {
 371                dprintk("exp_export: export of non-dev fs without fsid\n");
 372                return -EINVAL;
 373        }
 374
 375        if (!inode->i_sb->s_export_op ||
 376            !inode->i_sb->s_export_op->fh_to_dentry) {
 377                dprintk("exp_export: export of invalid fs type.\n");
 378                return -EINVAL;
 379        }
 380
 381        return 0;
 382
 383}
 384
 385#ifdef CONFIG_NFSD_V4
 386
 387static int
 388fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
 389{
 390        int len;
 391        int migrated, i, err;
 392
 393        /* more than one fsloc */
 394        if (fsloc->locations)
 395                return -EINVAL;
 396
 397        /* listsize */
 398        err = get_uint(mesg, &fsloc->locations_count);
 399        if (err)
 400                return err;
 401        if (fsloc->locations_count > MAX_FS_LOCATIONS)
 402                return -EINVAL;
 403        if (fsloc->locations_count == 0)
 404                return 0;
 405
 406        fsloc->locations = kzalloc(fsloc->locations_count
 407                        * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
 408        if (!fsloc->locations)
 409                return -ENOMEM;
 410        for (i=0; i < fsloc->locations_count; i++) {
 411                /* colon separated host list */
 412                err = -EINVAL;
 413                len = qword_get(mesg, buf, PAGE_SIZE);
 414                if (len <= 0)
 415                        goto out_free_all;
 416                err = -ENOMEM;
 417                fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
 418                if (!fsloc->locations[i].hosts)
 419                        goto out_free_all;
 420                err = -EINVAL;
 421                /* slash separated path component list */
 422                len = qword_get(mesg, buf, PAGE_SIZE);
 423                if (len <= 0)
 424                        goto out_free_all;
 425                err = -ENOMEM;
 426                fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
 427                if (!fsloc->locations[i].path)
 428                        goto out_free_all;
 429        }
 430        /* migrated */
 431        err = get_int(mesg, &migrated);
 432        if (err)
 433                goto out_free_all;
 434        err = -EINVAL;
 435        if (migrated < 0 || migrated > 1)
 436                goto out_free_all;
 437        fsloc->migrated = migrated;
 438        return 0;
 439out_free_all:
 440        nfsd4_fslocs_free(fsloc);
 441        return err;
 442}
 443
 444static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
 445{
 446        struct exp_flavor_info *f;
 447        u32 listsize;
 448        int err;
 449
 450        /* more than one secinfo */
 451        if (exp->ex_nflavors)
 452                return -EINVAL;
 453
 454        err = get_uint(mesg, &listsize);
 455        if (err)
 456                return err;
 457        if (listsize > MAX_SECINFO_LIST)
 458                return -EINVAL;
 459
 460        for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
 461                err = get_uint(mesg, &f->pseudoflavor);
 462                if (err)
 463                        return err;
 464                /*
 465                 * XXX: It would be nice to also check whether this
 466                 * pseudoflavor is supported, so we can discover the
 467                 * problem at export time instead of when a client fails
 468                 * to authenticate.
 469                 */
 470                err = get_uint(mesg, &f->flags);
 471                if (err)
 472                        return err;
 473                /* Only some flags are allowed to differ between flavors: */
 474                if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
 475                        return -EINVAL;
 476        }
 477        exp->ex_nflavors = listsize;
 478        return 0;
 479}
 480
 481#else /* CONFIG_NFSD_V4 */
 482static inline int
 483fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
 484static inline int
 485secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
 486#endif
 487
 488static inline int
 489uuid_parse(char **mesg, char *buf, unsigned char **puuid)
 490{
 491        int len;
 492
 493        /* more than one uuid */
 494        if (*puuid)
 495                return -EINVAL;
 496
 497        /* expect a 16 byte uuid encoded as \xXXXX... */
 498        len = qword_get(mesg, buf, PAGE_SIZE);
 499        if (len != EX_UUID_LEN)
 500                return -EINVAL;
 501
 502        *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
 503        if (*puuid == NULL)
 504                return -ENOMEM;
 505
 506        return 0;
 507}
 508
 509static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
 510{
 511        /* client path expiry [flags anonuid anongid fsid] */
 512        char *buf;
 513        int len;
 514        int err;
 515        struct auth_domain *dom = NULL;
 516        struct svc_export exp = {}, *expp;
 517        int an_int;
 518
 519        if (mesg[mlen-1] != '\n')
 520                return -EINVAL;
 521        mesg[mlen-1] = 0;
 522
 523        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 524        if (!buf)
 525                return -ENOMEM;
 526
 527        /* client */
 528        err = -EINVAL;
 529        len = qword_get(&mesg, buf, PAGE_SIZE);
 530        if (len <= 0)
 531                goto out;
 532
 533        err = -ENOENT;
 534        dom = auth_domain_find(buf);
 535        if (!dom)
 536                goto out;
 537
 538        /* path */
 539        err = -EINVAL;
 540        if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
 541                goto out1;
 542
 543        err = kern_path(buf, 0, &exp.ex_path);
 544        if (err)
 545                goto out1;
 546
 547        exp.ex_client = dom;
 548        exp.cd = cd;
 549        exp.ex_devid_map = NULL;
 550
 551        /* expiry */
 552        err = -EINVAL;
 553        exp.h.expiry_time = get_expiry(&mesg);
 554        if (exp.h.expiry_time == 0)
 555                goto out3;
 556
 557        /* flags */
 558        err = get_int(&mesg, &an_int);
 559        if (err == -ENOENT) {
 560                err = 0;
 561                set_bit(CACHE_NEGATIVE, &exp.h.flags);
 562        } else {
 563                if (err || an_int < 0)
 564                        goto out3;
 565                exp.ex_flags= an_int;
 566        
 567                /* anon uid */
 568                err = get_int(&mesg, &an_int);
 569                if (err)
 570                        goto out3;
 571                exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
 572
 573                /* anon gid */
 574                err = get_int(&mesg, &an_int);
 575                if (err)
 576                        goto out3;
 577                exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
 578
 579                /* fsid */
 580                err = get_int(&mesg, &an_int);
 581                if (err)
 582                        goto out3;
 583                exp.ex_fsid = an_int;
 584
 585                while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
 586                        if (strcmp(buf, "fsloc") == 0)
 587                                err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
 588                        else if (strcmp(buf, "uuid") == 0)
 589                                err = uuid_parse(&mesg, buf, &exp.ex_uuid);
 590                        else if (strcmp(buf, "secinfo") == 0)
 591                                err = secinfo_parse(&mesg, buf, &exp);
 592                        else
 593                                /* quietly ignore unknown words and anything
 594                                 * following. Newer user-space can try to set
 595                                 * new values, then see what the result was.
 596                                 */
 597                                break;
 598                        if (err)
 599                                goto out4;
 600                }
 601
 602                err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
 603                                   exp.ex_uuid);
 604                if (err)
 605                        goto out4;
 606                /*
 607                 * No point caching this if it would immediately expire.
 608                 * Also, this protects exportfs's dummy export from the
 609                 * anon_uid/anon_gid checks:
 610                 */
 611                if (exp.h.expiry_time < seconds_since_boot())
 612                        goto out4;
 613                /*
 614                 * For some reason exportfs has been passing down an
 615                 * invalid (-1) uid & gid on the "dummy" export which it
 616                 * uses to test export support.  To make sure exportfs
 617                 * sees errors from check_export we therefore need to
 618                 * delay these checks till after check_export:
 619                 */
 620                err = -EINVAL;
 621                if (!uid_valid(exp.ex_anon_uid))
 622                        goto out4;
 623                if (!gid_valid(exp.ex_anon_gid))
 624                        goto out4;
 625                err = 0;
 626
 627                nfsd4_setup_layout_type(&exp);
 628        }
 629
 630        expp = svc_export_lookup(&exp);
 631        if (expp)
 632                expp = svc_export_update(&exp, expp);
 633        else
 634                err = -ENOMEM;
 635        cache_flush();
 636        if (expp == NULL)
 637                err = -ENOMEM;
 638        else
 639                exp_put(expp);
 640out4:
 641        nfsd4_fslocs_free(&exp.ex_fslocs);
 642        kfree(exp.ex_uuid);
 643out3:
 644        path_put(&exp.ex_path);
 645out1:
 646        auth_domain_put(dom);
 647out:
 648        kfree(buf);
 649        return err;
 650}
 651
 652static void exp_flags(struct seq_file *m, int flag, int fsid,
 653                kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
 654static void show_secinfo(struct seq_file *m, struct svc_export *exp);
 655
 656static int svc_export_show(struct seq_file *m,
 657                           struct cache_detail *cd,
 658                           struct cache_head *h)
 659{
 660        struct svc_export *exp ;
 661
 662        if (h ==NULL) {
 663                seq_puts(m, "#path domain(flags)\n");
 664                return 0;
 665        }
 666        exp = container_of(h, struct svc_export, h);
 667        seq_path(m, &exp->ex_path, " \t\n\\");
 668        seq_putc(m, '\t');
 669        seq_escape(m, exp->ex_client->name, " \t\n\\");
 670        seq_putc(m, '(');
 671        if (test_bit(CACHE_VALID, &h->flags) && 
 672            !test_bit(CACHE_NEGATIVE, &h->flags)) {
 673                exp_flags(m, exp->ex_flags, exp->ex_fsid,
 674                          exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
 675                if (exp->ex_uuid) {
 676                        int i;
 677                        seq_puts(m, ",uuid=");
 678                        for (i = 0; i < EX_UUID_LEN; i++) {
 679                                if ((i&3) == 0 && i)
 680                                        seq_putc(m, ':');
 681                                seq_printf(m, "%02x", exp->ex_uuid[i]);
 682                        }
 683                }
 684                show_secinfo(m, exp);
 685        }
 686        seq_puts(m, ")\n");
 687        return 0;
 688}
 689static int svc_export_match(struct cache_head *a, struct cache_head *b)
 690{
 691        struct svc_export *orig = container_of(a, struct svc_export, h);
 692        struct svc_export *new = container_of(b, struct svc_export, h);
 693        return orig->ex_client == new->ex_client &&
 694                path_equal(&orig->ex_path, &new->ex_path);
 695}
 696
 697static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
 698{
 699        struct svc_export *new = container_of(cnew, struct svc_export, h);
 700        struct svc_export *item = container_of(citem, struct svc_export, h);
 701
 702        kref_get(&item->ex_client->ref);
 703        new->ex_client = item->ex_client;
 704        new->ex_path = item->ex_path;
 705        path_get(&item->ex_path);
 706        new->ex_fslocs.locations = NULL;
 707        new->ex_fslocs.locations_count = 0;
 708        new->ex_fslocs.migrated = 0;
 709        new->ex_layout_type = 0;
 710        new->ex_uuid = NULL;
 711        new->cd = item->cd;
 712}
 713
 714static void export_update(struct cache_head *cnew, struct cache_head *citem)
 715{
 716        struct svc_export *new = container_of(cnew, struct svc_export, h);
 717        struct svc_export *item = container_of(citem, struct svc_export, h);
 718        int i;
 719
 720        new->ex_flags = item->ex_flags;
 721        new->ex_anon_uid = item->ex_anon_uid;
 722        new->ex_anon_gid = item->ex_anon_gid;
 723        new->ex_fsid = item->ex_fsid;
 724        new->ex_devid_map = item->ex_devid_map;
 725        item->ex_devid_map = NULL;
 726        new->ex_uuid = item->ex_uuid;
 727        item->ex_uuid = NULL;
 728        new->ex_fslocs.locations = item->ex_fslocs.locations;
 729        item->ex_fslocs.locations = NULL;
 730        new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
 731        item->ex_fslocs.locations_count = 0;
 732        new->ex_fslocs.migrated = item->ex_fslocs.migrated;
 733        item->ex_fslocs.migrated = 0;
 734        new->ex_layout_type = item->ex_layout_type;
 735        new->ex_nflavors = item->ex_nflavors;
 736        for (i = 0; i < MAX_SECINFO_LIST; i++) {
 737                new->ex_flavors[i] = item->ex_flavors[i];
 738        }
 739}
 740
 741static struct cache_head *svc_export_alloc(void)
 742{
 743        struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
 744        if (i)
 745                return &i->h;
 746        else
 747                return NULL;
 748}
 749
 750static struct cache_detail svc_export_cache_template = {
 751        .owner          = THIS_MODULE,
 752        .hash_size      = EXPORT_HASHMAX,
 753        .name           = "nfsd.export",
 754        .cache_put      = svc_export_put,
 755        .cache_request  = svc_export_request,
 756        .cache_parse    = svc_export_parse,
 757        .cache_show     = svc_export_show,
 758        .match          = svc_export_match,
 759        .init           = svc_export_init,
 760        .update         = export_update,
 761        .alloc          = svc_export_alloc,
 762};
 763
 764static int
 765svc_export_hash(struct svc_export *exp)
 766{
 767        int hash;
 768
 769        hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
 770        hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
 771        hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
 772        return hash;
 773}
 774
 775static struct svc_export *
 776svc_export_lookup(struct svc_export *exp)
 777{
 778        struct cache_head *ch;
 779        int hash = svc_export_hash(exp);
 780
 781        ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
 782        if (ch)
 783                return container_of(ch, struct svc_export, h);
 784        else
 785                return NULL;
 786}
 787
 788static struct svc_export *
 789svc_export_update(struct svc_export *new, struct svc_export *old)
 790{
 791        struct cache_head *ch;
 792        int hash = svc_export_hash(old);
 793
 794        ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
 795        if (ch)
 796                return container_of(ch, struct svc_export, h);
 797        else
 798                return NULL;
 799}
 800
 801
 802static struct svc_expkey *
 803exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
 804             u32 *fsidv, struct cache_req *reqp)
 805{
 806        struct svc_expkey key, *ek;
 807        int err;
 808        
 809        if (!clp)
 810                return ERR_PTR(-ENOENT);
 811
 812        key.ek_client = clp;
 813        key.ek_fsidtype = fsid_type;
 814        memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
 815
 816        ek = svc_expkey_lookup(cd, &key);
 817        if (ek == NULL)
 818                return ERR_PTR(-ENOMEM);
 819        err = cache_check(cd, &ek->h, reqp);
 820        if (err)
 821                return ERR_PTR(err);
 822        return ek;
 823}
 824
 825static struct svc_export *
 826exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
 827                const struct path *path, struct cache_req *reqp)
 828{
 829        struct svc_export *exp, key;
 830        int err;
 831
 832        if (!clp)
 833                return ERR_PTR(-ENOENT);
 834
 835        key.ex_client = clp;
 836        key.ex_path = *path;
 837        key.cd = cd;
 838
 839        exp = svc_export_lookup(&key);
 840        if (exp == NULL)
 841                return ERR_PTR(-ENOMEM);
 842        err = cache_check(cd, &exp->h, reqp);
 843        if (err)
 844                return ERR_PTR(err);
 845        return exp;
 846}
 847
 848/*
 849 * Find the export entry for a given dentry.
 850 */
 851static struct svc_export *
 852exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
 853{
 854        struct dentry *saved = dget(path->dentry);
 855        struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
 856
 857        while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
 858                struct dentry *parent = dget_parent(path->dentry);
 859                dput(path->dentry);
 860                path->dentry = parent;
 861                exp = exp_get_by_name(cd, clp, path, NULL);
 862        }
 863        dput(path->dentry);
 864        path->dentry = saved;
 865        return exp;
 866}
 867
 868
 869
 870/*
 871 * Obtain the root fh on behalf of a client.
 872 * This could be done in user space, but I feel that it adds some safety
 873 * since its harder to fool a kernel module than a user space program.
 874 */
 875int
 876exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
 877           struct knfsd_fh *f, int maxsize)
 878{
 879        struct svc_export       *exp;
 880        struct path             path;
 881        struct inode            *inode;
 882        struct svc_fh           fh;
 883        int                     err;
 884        struct nfsd_net         *nn = net_generic(net, nfsd_net_id);
 885        struct cache_detail     *cd = nn->svc_export_cache;
 886
 887        err = -EPERM;
 888        /* NB: we probably ought to check that it's NUL-terminated */
 889        if (kern_path(name, 0, &path)) {
 890                printk("nfsd: exp_rootfh path not found %s", name);
 891                return err;
 892        }
 893        inode = d_inode(path.dentry);
 894
 895        dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
 896                 name, path.dentry, clp->name,
 897                 inode->i_sb->s_id, inode->i_ino);
 898        exp = exp_parent(cd, clp, &path);
 899        if (IS_ERR(exp)) {
 900                err = PTR_ERR(exp);
 901                goto out;
 902        }
 903
 904        /*
 905         * fh must be initialized before calling fh_compose
 906         */
 907        fh_init(&fh, maxsize);
 908        if (fh_compose(&fh, exp, path.dentry, NULL))
 909                err = -EINVAL;
 910        else
 911                err = 0;
 912        memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
 913        fh_put(&fh);
 914        exp_put(exp);
 915out:
 916        path_put(&path);
 917        return err;
 918}
 919
 920static struct svc_export *exp_find(struct cache_detail *cd,
 921                                   struct auth_domain *clp, int fsid_type,
 922                                   u32 *fsidv, struct cache_req *reqp)
 923{
 924        struct svc_export *exp;
 925        struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
 926        struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
 927        if (IS_ERR(ek))
 928                return ERR_CAST(ek);
 929
 930        exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
 931        cache_put(&ek->h, nn->svc_expkey_cache);
 932
 933        if (IS_ERR(exp))
 934                return ERR_CAST(exp);
 935        return exp;
 936}
 937
 938__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
 939{
 940        struct exp_flavor_info *f;
 941        struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
 942
 943        /* legacy gss-only clients are always OK: */
 944        if (exp->ex_client == rqstp->rq_gssclient)
 945                return 0;
 946        /* ip-address based client; check sec= export option: */
 947        for (f = exp->ex_flavors; f < end; f++) {
 948                if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
 949                        return 0;
 950        }
 951        /* defaults in absence of sec= options: */
 952        if (exp->ex_nflavors == 0) {
 953                if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
 954                    rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
 955                        return 0;
 956        }
 957        return nfserr_wrongsec;
 958}
 959
 960/*
 961 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
 962 * auth_unix client) if it's available and has secinfo information;
 963 * otherwise, will try to use rq_gssclient.
 964 *
 965 * Called from functions that handle requests; functions that do work on
 966 * behalf of mountd are passed a single client name to use, and should
 967 * use exp_get_by_name() or exp_find().
 968 */
 969struct svc_export *
 970rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
 971{
 972        struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
 973        struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 974        struct cache_detail *cd = nn->svc_export_cache;
 975
 976        if (rqstp->rq_client == NULL)
 977                goto gss;
 978
 979        /* First try the auth_unix client: */
 980        exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
 981        if (PTR_ERR(exp) == -ENOENT)
 982                goto gss;
 983        if (IS_ERR(exp))
 984                return exp;
 985        /* If it has secinfo, assume there are no gss/... clients */
 986        if (exp->ex_nflavors > 0)
 987                return exp;
 988gss:
 989        /* Otherwise, try falling back on gss client */
 990        if (rqstp->rq_gssclient == NULL)
 991                return exp;
 992        gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
 993        if (PTR_ERR(gssexp) == -ENOENT)
 994                return exp;
 995        if (!IS_ERR(exp))
 996                exp_put(exp);
 997        return gssexp;
 998}
 999
1000struct svc_export *
1001rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1002{
1003        struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1004        struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1005        struct cache_detail *cd = nn->svc_export_cache;
1006
1007        if (rqstp->rq_client == NULL)
1008                goto gss;
1009
1010        /* First try the auth_unix client: */
1011        exp = exp_find(cd, rqstp->rq_client, fsid_type,
1012                       fsidv, &rqstp->rq_chandle);
1013        if (PTR_ERR(exp) == -ENOENT)
1014                goto gss;
1015        if (IS_ERR(exp))
1016                return exp;
1017        /* If it has secinfo, assume there are no gss/... clients */
1018        if (exp->ex_nflavors > 0)
1019                return exp;
1020gss:
1021        /* Otherwise, try falling back on gss client */
1022        if (rqstp->rq_gssclient == NULL)
1023                return exp;
1024        gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1025                                                &rqstp->rq_chandle);
1026        if (PTR_ERR(gssexp) == -ENOENT)
1027                return exp;
1028        if (!IS_ERR(exp))
1029                exp_put(exp);
1030        return gssexp;
1031}
1032
1033struct svc_export *
1034rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1035{
1036        struct dentry *saved = dget(path->dentry);
1037        struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1038
1039        while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1040                struct dentry *parent = dget_parent(path->dentry);
1041                dput(path->dentry);
1042                path->dentry = parent;
1043                exp = rqst_exp_get_by_name(rqstp, path);
1044        }
1045        dput(path->dentry);
1046        path->dentry = saved;
1047        return exp;
1048}
1049
1050struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1051{
1052        u32 fsidv[2];
1053
1054        mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1055
1056        return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1057}
1058
1059/*
1060 * Called when we need the filehandle for the root of the pseudofs,
1061 * for a given NFSv4 client.   The root is defined to be the
1062 * export point with fsid==0
1063 */
1064__be32
1065exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1066{
1067        struct svc_export *exp;
1068        __be32 rv;
1069
1070        exp = rqst_find_fsidzero_export(rqstp);
1071        if (IS_ERR(exp))
1072                return nfserrno(PTR_ERR(exp));
1073        rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1074        exp_put(exp);
1075        return rv;
1076}
1077
1078/* Iterator */
1079
1080static void *e_start(struct seq_file *m, loff_t *pos)
1081        __acquires(((struct cache_detail *)m->private)->hash_lock)
1082{
1083        loff_t n = *pos;
1084        unsigned hash, export;
1085        struct cache_head *ch;
1086        struct cache_detail *cd = m->private;
1087        struct cache_head **export_table = cd->hash_table;
1088
1089        read_lock(&cd->hash_lock);
1090        if (!n--)
1091                return SEQ_START_TOKEN;
1092        hash = n >> 32;
1093        export = n & ((1LL<<32) - 1);
1094
1095        
1096        for (ch=export_table[hash]; ch; ch=ch->next)
1097                if (!export--)
1098                        return ch;
1099        n &= ~((1LL<<32) - 1);
1100        do {
1101                hash++;
1102                n += 1LL<<32;
1103        } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1104        if (hash >= EXPORT_HASHMAX)
1105                return NULL;
1106        *pos = n+1;
1107        return export_table[hash];
1108}
1109
1110static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1111{
1112        struct cache_head *ch = p;
1113        int hash = (*pos >> 32);
1114        struct cache_detail *cd = m->private;
1115        struct cache_head **export_table = cd->hash_table;
1116
1117        if (p == SEQ_START_TOKEN)
1118                hash = 0;
1119        else if (ch->next == NULL) {
1120                hash++;
1121                *pos += 1LL<<32;
1122        } else {
1123                ++*pos;
1124                return ch->next;
1125        }
1126        *pos &= ~((1LL<<32) - 1);
1127        while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1128                hash++;
1129                *pos += 1LL<<32;
1130        }
1131        if (hash >= EXPORT_HASHMAX)
1132                return NULL;
1133        ++*pos;
1134        return export_table[hash];
1135}
1136
1137static void e_stop(struct seq_file *m, void *p)
1138        __releases(((struct cache_detail *)m->private)->hash_lock)
1139{
1140        struct cache_detail *cd = m->private;
1141
1142        read_unlock(&cd->hash_lock);
1143}
1144
1145static struct flags {
1146        int flag;
1147        char *name[2];
1148} expflags[] = {
1149        { NFSEXP_READONLY, {"ro", "rw"}},
1150        { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1151        { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1152        { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1153        { NFSEXP_ASYNC, {"async", "sync"}},
1154        { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1155        { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1156        { NFSEXP_NOHIDE, {"nohide", ""}},
1157        { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1158        { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1159        { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1160        { NFSEXP_V4ROOT, {"v4root", ""}},
1161        { NFSEXP_PNFS, {"pnfs", ""}},
1162        { 0, {"", ""}}
1163};
1164
1165static void show_expflags(struct seq_file *m, int flags, int mask)
1166{
1167        struct flags *flg;
1168        int state, first = 0;
1169
1170        for (flg = expflags; flg->flag; flg++) {
1171                if (flg->flag & ~mask)
1172                        continue;
1173                state = (flg->flag & flags) ? 0 : 1;
1174                if (*flg->name[state])
1175                        seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1176        }
1177}
1178
1179static void show_secinfo_flags(struct seq_file *m, int flags)
1180{
1181        seq_printf(m, ",");
1182        show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1183}
1184
1185static bool secinfo_flags_equal(int f, int g)
1186{
1187        f &= NFSEXP_SECINFO_FLAGS;
1188        g &= NFSEXP_SECINFO_FLAGS;
1189        return f == g;
1190}
1191
1192static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1193{
1194        int flags;
1195
1196        flags = (*fp)->flags;
1197        seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1198        (*fp)++;
1199        while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1200                seq_printf(m, ":%d", (*fp)->pseudoflavor);
1201                (*fp)++;
1202        }
1203        return flags;
1204}
1205
1206static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1207{
1208        struct exp_flavor_info *f;
1209        struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1210        int flags;
1211
1212        if (exp->ex_nflavors == 0)
1213                return;
1214        f = exp->ex_flavors;
1215        flags = show_secinfo_run(m, &f, end);
1216        if (!secinfo_flags_equal(flags, exp->ex_flags))
1217                show_secinfo_flags(m, flags);
1218        while (f != end) {
1219                flags = show_secinfo_run(m, &f, end);
1220                show_secinfo_flags(m, flags);
1221        }
1222}
1223
1224static void exp_flags(struct seq_file *m, int flag, int fsid,
1225                kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1226{
1227        show_expflags(m, flag, NFSEXP_ALLFLAGS);
1228        if (flag & NFSEXP_FSID)
1229                seq_printf(m, ",fsid=%d", fsid);
1230        if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1231            !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1232                seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1233        if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1234            !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1235                seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1236        if (fsloc && fsloc->locations_count > 0) {
1237                char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1238                int i;
1239
1240                seq_printf(m, ",%s=", loctype);
1241                seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1242                seq_putc(m, '@');
1243                seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1244                for (i = 1; i < fsloc->locations_count; i++) {
1245                        seq_putc(m, ';');
1246                        seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1247                        seq_putc(m, '@');
1248                        seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1249                }
1250        }
1251}
1252
1253static int e_show(struct seq_file *m, void *p)
1254{
1255        struct cache_head *cp = p;
1256        struct svc_export *exp = container_of(cp, struct svc_export, h);
1257        struct cache_detail *cd = m->private;
1258
1259        if (p == SEQ_START_TOKEN) {
1260                seq_puts(m, "# Version 1.1\n");
1261                seq_puts(m, "# Path Client(Flags) # IPs\n");
1262                return 0;
1263        }
1264
1265        exp_get(exp);
1266        if (cache_check(cd, &exp->h, NULL))
1267                return 0;
1268        exp_put(exp);
1269        return svc_export_show(m, cd, cp);
1270}
1271
1272const struct seq_operations nfs_exports_op = {
1273        .start  = e_start,
1274        .next   = e_next,
1275        .stop   = e_stop,
1276        .show   = e_show,
1277};
1278
1279/*
1280 * Initialize the exports module.
1281 */
1282int
1283nfsd_export_init(struct net *net)
1284{
1285        int rv;
1286        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1287
1288        dprintk("nfsd: initializing export module (net: %p).\n", net);
1289
1290        nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1291        if (IS_ERR(nn->svc_export_cache))
1292                return PTR_ERR(nn->svc_export_cache);
1293        rv = cache_register_net(nn->svc_export_cache, net);
1294        if (rv)
1295                goto destroy_export_cache;
1296
1297        nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1298        if (IS_ERR(nn->svc_expkey_cache)) {
1299                rv = PTR_ERR(nn->svc_expkey_cache);
1300                goto unregister_export_cache;
1301        }
1302        rv = cache_register_net(nn->svc_expkey_cache, net);
1303        if (rv)
1304                goto destroy_expkey_cache;
1305        return 0;
1306
1307destroy_expkey_cache:
1308        cache_destroy_net(nn->svc_expkey_cache, net);
1309unregister_export_cache:
1310        cache_unregister_net(nn->svc_export_cache, net);
1311destroy_export_cache:
1312        cache_destroy_net(nn->svc_export_cache, net);
1313        return rv;
1314}
1315
1316/*
1317 * Flush exports table - called when last nfsd thread is killed
1318 */
1319void
1320nfsd_export_flush(struct net *net)
1321{
1322        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1323
1324        cache_purge(nn->svc_expkey_cache);
1325        cache_purge(nn->svc_export_cache);
1326}
1327
1328/*
1329 * Shutdown the exports module.
1330 */
1331void
1332nfsd_export_shutdown(struct net *net)
1333{
1334        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1335
1336        dprintk("nfsd: shutting down export module (net: %p).\n", net);
1337
1338        cache_unregister_net(nn->svc_expkey_cache, net);
1339        cache_unregister_net(nn->svc_export_cache, net);
1340        cache_destroy_net(nn->svc_expkey_cache, net);
1341        cache_destroy_net(nn->svc_export_cache, net);
1342        svcauth_unix_purge(net);
1343
1344        dprintk("nfsd: export shutdown complete (net: %p).\n", net);
1345}
1346