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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * NFS exporting and validation.
0004  *
0005  * We maintain a list of clients, each of which has a list of
0006  * exports. To export an fs to a given client, you first have
0007  * to create the client entry with NFSCTL_ADDCLIENT, which
0008  * creates a client control block and adds it to the hash
0009  * table. Then, you call NFSCTL_EXPORT for each fs.
0010  *
0011  *
0012  * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
0013  */
0014 
0015 #include <linux/slab.h>
0016 #include <linux/namei.h>
0017 #include <linux/module.h>
0018 #include <linux/exportfs.h>
0019 #include <linux/sunrpc/svc_xprt.h>
0020 
0021 #include "nfsd.h"
0022 #include "nfsfh.h"
0023 #include "netns.h"
0024 #include "pnfs.h"
0025 #include "filecache.h"
0026 #include "trace.h"
0027 
0028 #define NFSDDBG_FACILITY    NFSDDBG_EXPORT
0029 
0030 /*
0031  * We have two caches.
0032  * One maps client+vfsmnt+dentry to export options - the export map
0033  * The other maps client+filehandle-fragment to export options. - the expkey map
0034  *
0035  * The export options are actually stored in the first map, and the
0036  * second map contains a reference to the entry in the first map.
0037  */
0038 
0039 #define EXPKEY_HASHBITS     8
0040 #define EXPKEY_HASHMAX      (1 << EXPKEY_HASHBITS)
0041 #define EXPKEY_HASHMASK     (EXPKEY_HASHMAX -1)
0042 
0043 static void expkey_put(struct kref *ref)
0044 {
0045     struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
0046 
0047     if (test_bit(CACHE_VALID, &key->h.flags) &&
0048         !test_bit(CACHE_NEGATIVE, &key->h.flags))
0049         path_put(&key->ek_path);
0050     auth_domain_put(key->ek_client);
0051     kfree_rcu(key, ek_rcu);
0052 }
0053 
0054 static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
0055 {
0056     return sunrpc_cache_pipe_upcall(cd, h);
0057 }
0058 
0059 static void expkey_request(struct cache_detail *cd,
0060                struct cache_head *h,
0061                char **bpp, int *blen)
0062 {
0063     /* client fsidtype \xfsid */
0064     struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
0065     char type[5];
0066 
0067     qword_add(bpp, blen, ek->ek_client->name);
0068     snprintf(type, 5, "%d", ek->ek_fsidtype);
0069     qword_add(bpp, blen, type);
0070     qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
0071     (*bpp)[-1] = '\n';
0072 }
0073 
0074 static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
0075                         struct svc_expkey *old);
0076 static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
0077 
0078 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
0079 {
0080     /* client fsidtype fsid expiry [path] */
0081     char *buf;
0082     int len;
0083     struct auth_domain *dom = NULL;
0084     int err;
0085     int fsidtype;
0086     char *ep;
0087     struct svc_expkey key;
0088     struct svc_expkey *ek = NULL;
0089 
0090     if (mesg[mlen - 1] != '\n')
0091         return -EINVAL;
0092     mesg[mlen-1] = 0;
0093 
0094     buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
0095     err = -ENOMEM;
0096     if (!buf)
0097         goto out;
0098 
0099     err = -EINVAL;
0100     if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
0101         goto out;
0102 
0103     err = -ENOENT;
0104     dom = auth_domain_find(buf);
0105     if (!dom)
0106         goto out;
0107     dprintk("found domain %s\n", buf);
0108 
0109     err = -EINVAL;
0110     if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
0111         goto out;
0112     fsidtype = simple_strtoul(buf, &ep, 10);
0113     if (*ep)
0114         goto out;
0115     dprintk("found fsidtype %d\n", fsidtype);
0116     if (key_len(fsidtype)==0) /* invalid type */
0117         goto out;
0118     if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
0119         goto out;
0120     dprintk("found fsid length %d\n", len);
0121     if (len != key_len(fsidtype))
0122         goto out;
0123 
0124     /* OK, we seem to have a valid key */
0125     key.h.flags = 0;
0126     key.h.expiry_time = get_expiry(&mesg);
0127     if (key.h.expiry_time == 0)
0128         goto out;
0129 
0130     key.ek_client = dom;    
0131     key.ek_fsidtype = fsidtype;
0132     memcpy(key.ek_fsid, buf, len);
0133 
0134     ek = svc_expkey_lookup(cd, &key);
0135     err = -ENOMEM;
0136     if (!ek)
0137         goto out;
0138 
0139     /* now we want a pathname, or empty meaning NEGATIVE  */
0140     err = -EINVAL;
0141     len = qword_get(&mesg, buf, PAGE_SIZE);
0142     if (len < 0)
0143         goto out;
0144     dprintk("Path seems to be <%s>\n", buf);
0145     err = 0;
0146     if (len == 0) {
0147         set_bit(CACHE_NEGATIVE, &key.h.flags);
0148         ek = svc_expkey_update(cd, &key, ek);
0149         if (ek)
0150             trace_nfsd_expkey_update(ek, NULL);
0151         else
0152             err = -ENOMEM;
0153     } else {
0154         err = kern_path(buf, 0, &key.ek_path);
0155         if (err)
0156             goto out;
0157 
0158         dprintk("Found the path %s\n", buf);
0159 
0160         ek = svc_expkey_update(cd, &key, ek);
0161         if (ek)
0162             trace_nfsd_expkey_update(ek, buf);
0163         else
0164             err = -ENOMEM;
0165         path_put(&key.ek_path);
0166     }
0167     cache_flush();
0168  out:
0169     if (ek)
0170         cache_put(&ek->h, cd);
0171     if (dom)
0172         auth_domain_put(dom);
0173     kfree(buf);
0174     return err;
0175 }
0176 
0177 static int expkey_show(struct seq_file *m,
0178                struct cache_detail *cd,
0179                struct cache_head *h)
0180 {
0181     struct svc_expkey *ek ;
0182     int i;
0183 
0184     if (h ==NULL) {
0185         seq_puts(m, "#domain fsidtype fsid [path]\n");
0186         return 0;
0187     }
0188     ek = container_of(h, struct svc_expkey, h);
0189     seq_printf(m, "%s %d 0x", ek->ek_client->name,
0190            ek->ek_fsidtype);
0191     for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
0192         seq_printf(m, "%08x", ek->ek_fsid[i]);
0193     if (test_bit(CACHE_VALID, &h->flags) && 
0194         !test_bit(CACHE_NEGATIVE, &h->flags)) {
0195         seq_printf(m, " ");
0196         seq_path(m, &ek->ek_path, "\\ \t\n");
0197     }
0198     seq_printf(m, "\n");
0199     return 0;
0200 }
0201 
0202 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
0203 {
0204     struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
0205     struct svc_expkey *new = container_of(b, struct svc_expkey, h);
0206 
0207     if (orig->ek_fsidtype != new->ek_fsidtype ||
0208         orig->ek_client != new->ek_client ||
0209         memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
0210         return 0;
0211     return 1;
0212 }
0213 
0214 static inline void expkey_init(struct cache_head *cnew,
0215                    struct cache_head *citem)
0216 {
0217     struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
0218     struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
0219 
0220     kref_get(&item->ek_client->ref);
0221     new->ek_client = item->ek_client;
0222     new->ek_fsidtype = item->ek_fsidtype;
0223 
0224     memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
0225 }
0226 
0227 static inline void expkey_update(struct cache_head *cnew,
0228                    struct cache_head *citem)
0229 {
0230     struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
0231     struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
0232 
0233     new->ek_path = item->ek_path;
0234     path_get(&item->ek_path);
0235 }
0236 
0237 static struct cache_head *expkey_alloc(void)
0238 {
0239     struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
0240     if (i)
0241         return &i->h;
0242     else
0243         return NULL;
0244 }
0245 
0246 static void expkey_flush(void)
0247 {
0248     /*
0249      * Take the nfsd_mutex here to ensure that the file cache is not
0250      * destroyed while we're in the middle of flushing.
0251      */
0252     mutex_lock(&nfsd_mutex);
0253     nfsd_file_cache_purge(current->nsproxy->net_ns);
0254     mutex_unlock(&nfsd_mutex);
0255 }
0256 
0257 static const struct cache_detail svc_expkey_cache_template = {
0258     .owner      = THIS_MODULE,
0259     .hash_size  = EXPKEY_HASHMAX,
0260     .name       = "nfsd.fh",
0261     .cache_put  = expkey_put,
0262     .cache_upcall   = expkey_upcall,
0263     .cache_request  = expkey_request,
0264     .cache_parse    = expkey_parse,
0265     .cache_show = expkey_show,
0266     .match      = expkey_match,
0267     .init       = expkey_init,
0268     .update         = expkey_update,
0269     .alloc      = expkey_alloc,
0270     .flush      = expkey_flush,
0271 };
0272 
0273 static int
0274 svc_expkey_hash(struct svc_expkey *item)
0275 {
0276     int hash = item->ek_fsidtype;
0277     char * cp = (char*)item->ek_fsid;
0278     int len = key_len(item->ek_fsidtype);
0279 
0280     hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
0281     hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
0282     hash &= EXPKEY_HASHMASK;
0283     return hash;
0284 }
0285 
0286 static struct svc_expkey *
0287 svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
0288 {
0289     struct cache_head *ch;
0290     int hash = svc_expkey_hash(item);
0291 
0292     ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
0293     if (ch)
0294         return container_of(ch, struct svc_expkey, h);
0295     else
0296         return NULL;
0297 }
0298 
0299 static struct svc_expkey *
0300 svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
0301           struct svc_expkey *old)
0302 {
0303     struct cache_head *ch;
0304     int hash = svc_expkey_hash(new);
0305 
0306     ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
0307     if (ch)
0308         return container_of(ch, struct svc_expkey, h);
0309     else
0310         return NULL;
0311 }
0312 
0313 
0314 #define EXPORT_HASHBITS     8
0315 #define EXPORT_HASHMAX      (1<< EXPORT_HASHBITS)
0316 
0317 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
0318 {
0319     struct nfsd4_fs_location *locations = fsloc->locations;
0320     int i;
0321 
0322     if (!locations)
0323         return;
0324 
0325     for (i = 0; i < fsloc->locations_count; i++) {
0326         kfree(locations[i].path);
0327         kfree(locations[i].hosts);
0328     }
0329 
0330     kfree(locations);
0331     fsloc->locations = NULL;
0332 }
0333 
0334 static int export_stats_init(struct export_stats *stats)
0335 {
0336     stats->start_time = ktime_get_seconds();
0337     return nfsd_percpu_counters_init(stats->counter, EXP_STATS_COUNTERS_NUM);
0338 }
0339 
0340 static void export_stats_reset(struct export_stats *stats)
0341 {
0342     nfsd_percpu_counters_reset(stats->counter, EXP_STATS_COUNTERS_NUM);
0343 }
0344 
0345 static void export_stats_destroy(struct export_stats *stats)
0346 {
0347     nfsd_percpu_counters_destroy(stats->counter, EXP_STATS_COUNTERS_NUM);
0348 }
0349 
0350 static void svc_export_put(struct kref *ref)
0351 {
0352     struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
0353     path_put(&exp->ex_path);
0354     auth_domain_put(exp->ex_client);
0355     nfsd4_fslocs_free(&exp->ex_fslocs);
0356     export_stats_destroy(&exp->ex_stats);
0357     kfree(exp->ex_uuid);
0358     kfree_rcu(exp, ex_rcu);
0359 }
0360 
0361 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
0362 {
0363     return sunrpc_cache_pipe_upcall(cd, h);
0364 }
0365 
0366 static void svc_export_request(struct cache_detail *cd,
0367                    struct cache_head *h,
0368                    char **bpp, int *blen)
0369 {
0370     /*  client path */
0371     struct svc_export *exp = container_of(h, struct svc_export, h);
0372     char *pth;
0373 
0374     qword_add(bpp, blen, exp->ex_client->name);
0375     pth = d_path(&exp->ex_path, *bpp, *blen);
0376     if (IS_ERR(pth)) {
0377         /* is this correct? */
0378         (*bpp)[0] = '\n';
0379         return;
0380     }
0381     qword_add(bpp, blen, pth);
0382     (*bpp)[-1] = '\n';
0383 }
0384 
0385 static struct svc_export *svc_export_update(struct svc_export *new,
0386                         struct svc_export *old);
0387 static struct svc_export *svc_export_lookup(struct svc_export *);
0388 
0389 static int check_export(struct path *path, int *flags, unsigned char *uuid)
0390 {
0391     struct inode *inode = d_inode(path->dentry);
0392 
0393     /*
0394      * We currently export only dirs, regular files, and (for v4
0395      * pseudoroot) symlinks.
0396      */
0397     if (!S_ISDIR(inode->i_mode) &&
0398         !S_ISLNK(inode->i_mode) &&
0399         !S_ISREG(inode->i_mode))
0400         return -ENOTDIR;
0401 
0402     /*
0403      * Mountd should never pass down a writeable V4ROOT export, but,
0404      * just to make sure:
0405      */
0406     if (*flags & NFSEXP_V4ROOT)
0407         *flags |= NFSEXP_READONLY;
0408 
0409     /* There are two requirements on a filesystem to be exportable.
0410      * 1:  We must be able to identify the filesystem from a number.
0411      *       either a device number (so FS_REQUIRES_DEV needed)
0412      *       or an FSID number (so NFSEXP_FSID or ->uuid is needed).
0413      * 2:  We must be able to find an inode from a filehandle.
0414      *       This means that s_export_op must be set.
0415      * 3: We must not currently be on an idmapped mount.
0416      */
0417     if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
0418         !(*flags & NFSEXP_FSID) &&
0419         uuid == NULL) {
0420         dprintk("exp_export: export of non-dev fs without fsid\n");
0421         return -EINVAL;
0422     }
0423 
0424     if (!inode->i_sb->s_export_op ||
0425         !inode->i_sb->s_export_op->fh_to_dentry) {
0426         dprintk("exp_export: export of invalid fs type.\n");
0427         return -EINVAL;
0428     }
0429 
0430     if (is_idmapped_mnt(path->mnt)) {
0431         dprintk("exp_export: export of idmapped mounts not yet supported.\n");
0432         return -EINVAL;
0433     }
0434 
0435     if (inode->i_sb->s_export_op->flags & EXPORT_OP_NOSUBTREECHK &&
0436         !(*flags & NFSEXP_NOSUBTREECHECK)) {
0437         dprintk("%s: %s does not support subtree checking!\n",
0438             __func__, inode->i_sb->s_type->name);
0439         return -EINVAL;
0440     }
0441     return 0;
0442 
0443 }
0444 
0445 #ifdef CONFIG_NFSD_V4
0446 
0447 static int
0448 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
0449 {
0450     int len;
0451     int migrated, i, err;
0452 
0453     /* more than one fsloc */
0454     if (fsloc->locations)
0455         return -EINVAL;
0456 
0457     /* listsize */
0458     err = get_uint(mesg, &fsloc->locations_count);
0459     if (err)
0460         return err;
0461     if (fsloc->locations_count > MAX_FS_LOCATIONS)
0462         return -EINVAL;
0463     if (fsloc->locations_count == 0)
0464         return 0;
0465 
0466     fsloc->locations = kcalloc(fsloc->locations_count,
0467                    sizeof(struct nfsd4_fs_location),
0468                    GFP_KERNEL);
0469     if (!fsloc->locations)
0470         return -ENOMEM;
0471     for (i=0; i < fsloc->locations_count; i++) {
0472         /* colon separated host list */
0473         err = -EINVAL;
0474         len = qword_get(mesg, buf, PAGE_SIZE);
0475         if (len <= 0)
0476             goto out_free_all;
0477         err = -ENOMEM;
0478         fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
0479         if (!fsloc->locations[i].hosts)
0480             goto out_free_all;
0481         err = -EINVAL;
0482         /* slash separated path component list */
0483         len = qword_get(mesg, buf, PAGE_SIZE);
0484         if (len <= 0)
0485             goto out_free_all;
0486         err = -ENOMEM;
0487         fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
0488         if (!fsloc->locations[i].path)
0489             goto out_free_all;
0490     }
0491     /* migrated */
0492     err = get_int(mesg, &migrated);
0493     if (err)
0494         goto out_free_all;
0495     err = -EINVAL;
0496     if (migrated < 0 || migrated > 1)
0497         goto out_free_all;
0498     fsloc->migrated = migrated;
0499     return 0;
0500 out_free_all:
0501     nfsd4_fslocs_free(fsloc);
0502     return err;
0503 }
0504 
0505 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
0506 {
0507     struct exp_flavor_info *f;
0508     u32 listsize;
0509     int err;
0510 
0511     /* more than one secinfo */
0512     if (exp->ex_nflavors)
0513         return -EINVAL;
0514 
0515     err = get_uint(mesg, &listsize);
0516     if (err)
0517         return err;
0518     if (listsize > MAX_SECINFO_LIST)
0519         return -EINVAL;
0520 
0521     for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
0522         err = get_uint(mesg, &f->pseudoflavor);
0523         if (err)
0524             return err;
0525         /*
0526          * XXX: It would be nice to also check whether this
0527          * pseudoflavor is supported, so we can discover the
0528          * problem at export time instead of when a client fails
0529          * to authenticate.
0530          */
0531         err = get_uint(mesg, &f->flags);
0532         if (err)
0533             return err;
0534         /* Only some flags are allowed to differ between flavors: */
0535         if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
0536             return -EINVAL;
0537     }
0538     exp->ex_nflavors = listsize;
0539     return 0;
0540 }
0541 
0542 #else /* CONFIG_NFSD_V4 */
0543 static inline int
0544 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
0545 static inline int
0546 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
0547 #endif
0548 
0549 static inline int
0550 nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
0551 {
0552     int len;
0553 
0554     /* more than one uuid */
0555     if (*puuid)
0556         return -EINVAL;
0557 
0558     /* expect a 16 byte uuid encoded as \xXXXX... */
0559     len = qword_get(mesg, buf, PAGE_SIZE);
0560     if (len != EX_UUID_LEN)
0561         return -EINVAL;
0562 
0563     *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
0564     if (*puuid == NULL)
0565         return -ENOMEM;
0566 
0567     return 0;
0568 }
0569 
0570 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
0571 {
0572     /* client path expiry [flags anonuid anongid fsid] */
0573     char *buf;
0574     int len;
0575     int err;
0576     struct auth_domain *dom = NULL;
0577     struct svc_export exp = {}, *expp;
0578     int an_int;
0579 
0580     if (mesg[mlen-1] != '\n')
0581         return -EINVAL;
0582     mesg[mlen-1] = 0;
0583 
0584     buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
0585     if (!buf)
0586         return -ENOMEM;
0587 
0588     /* client */
0589     err = -EINVAL;
0590     len = qword_get(&mesg, buf, PAGE_SIZE);
0591     if (len <= 0)
0592         goto out;
0593 
0594     err = -ENOENT;
0595     dom = auth_domain_find(buf);
0596     if (!dom)
0597         goto out;
0598 
0599     /* path */
0600     err = -EINVAL;
0601     if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
0602         goto out1;
0603 
0604     err = kern_path(buf, 0, &exp.ex_path);
0605     if (err)
0606         goto out1;
0607 
0608     exp.ex_client = dom;
0609     exp.cd = cd;
0610     exp.ex_devid_map = NULL;
0611 
0612     /* expiry */
0613     err = -EINVAL;
0614     exp.h.expiry_time = get_expiry(&mesg);
0615     if (exp.h.expiry_time == 0)
0616         goto out3;
0617 
0618     /* flags */
0619     err = get_int(&mesg, &an_int);
0620     if (err == -ENOENT) {
0621         err = 0;
0622         set_bit(CACHE_NEGATIVE, &exp.h.flags);
0623     } else {
0624         if (err || an_int < 0)
0625             goto out3;
0626         exp.ex_flags= an_int;
0627     
0628         /* anon uid */
0629         err = get_int(&mesg, &an_int);
0630         if (err)
0631             goto out3;
0632         exp.ex_anon_uid= make_kuid(current_user_ns(), an_int);
0633 
0634         /* anon gid */
0635         err = get_int(&mesg, &an_int);
0636         if (err)
0637             goto out3;
0638         exp.ex_anon_gid= make_kgid(current_user_ns(), an_int);
0639 
0640         /* fsid */
0641         err = get_int(&mesg, &an_int);
0642         if (err)
0643             goto out3;
0644         exp.ex_fsid = an_int;
0645 
0646         while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
0647             if (strcmp(buf, "fsloc") == 0)
0648                 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
0649             else if (strcmp(buf, "uuid") == 0)
0650                 err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid);
0651             else if (strcmp(buf, "secinfo") == 0)
0652                 err = secinfo_parse(&mesg, buf, &exp);
0653             else
0654                 /* quietly ignore unknown words and anything
0655                  * following. Newer user-space can try to set
0656                  * new values, then see what the result was.
0657                  */
0658                 break;
0659             if (err)
0660                 goto out4;
0661         }
0662 
0663         err = check_export(&exp.ex_path, &exp.ex_flags, exp.ex_uuid);
0664         if (err)
0665             goto out4;
0666         /*
0667          * No point caching this if it would immediately expire.
0668          * Also, this protects exportfs's dummy export from the
0669          * anon_uid/anon_gid checks:
0670          */
0671         if (exp.h.expiry_time < seconds_since_boot())
0672             goto out4;
0673         /*
0674          * For some reason exportfs has been passing down an
0675          * invalid (-1) uid & gid on the "dummy" export which it
0676          * uses to test export support.  To make sure exportfs
0677          * sees errors from check_export we therefore need to
0678          * delay these checks till after check_export:
0679          */
0680         err = -EINVAL;
0681         if (!uid_valid(exp.ex_anon_uid))
0682             goto out4;
0683         if (!gid_valid(exp.ex_anon_gid))
0684             goto out4;
0685         err = 0;
0686 
0687         nfsd4_setup_layout_type(&exp);
0688     }
0689 
0690     expp = svc_export_lookup(&exp);
0691     if (!expp) {
0692         err = -ENOMEM;
0693         goto out4;
0694     }
0695     expp = svc_export_update(&exp, expp);
0696     if (expp) {
0697         trace_nfsd_export_update(expp);
0698         cache_flush();
0699         exp_put(expp);
0700     } else
0701         err = -ENOMEM;
0702 out4:
0703     nfsd4_fslocs_free(&exp.ex_fslocs);
0704     kfree(exp.ex_uuid);
0705 out3:
0706     path_put(&exp.ex_path);
0707 out1:
0708     auth_domain_put(dom);
0709 out:
0710     kfree(buf);
0711     return err;
0712 }
0713 
0714 static void exp_flags(struct seq_file *m, int flag, int fsid,
0715         kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
0716 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
0717 
0718 static int is_export_stats_file(struct seq_file *m)
0719 {
0720     /*
0721      * The export_stats file uses the same ops as the exports file.
0722      * We use the file's name to determine the reported info per export.
0723      * There is no rename in nsfdfs, so d_name.name is stable.
0724      */
0725     return !strcmp(m->file->f_path.dentry->d_name.name, "export_stats");
0726 }
0727 
0728 static int svc_export_show(struct seq_file *m,
0729                struct cache_detail *cd,
0730                struct cache_head *h)
0731 {
0732     struct svc_export *exp;
0733     bool export_stats = is_export_stats_file(m);
0734 
0735     if (h == NULL) {
0736         if (export_stats)
0737             seq_puts(m, "#path domain start-time\n#\tstats\n");
0738         else
0739             seq_puts(m, "#path domain(flags)\n");
0740         return 0;
0741     }
0742     exp = container_of(h, struct svc_export, h);
0743     seq_path(m, &exp->ex_path, " \t\n\\");
0744     seq_putc(m, '\t');
0745     seq_escape(m, exp->ex_client->name, " \t\n\\");
0746     if (export_stats) {
0747         seq_printf(m, "\t%lld\n", exp->ex_stats.start_time);
0748         seq_printf(m, "\tfh_stale: %lld\n",
0749                percpu_counter_sum_positive(&exp->ex_stats.counter[EXP_STATS_FH_STALE]));
0750         seq_printf(m, "\tio_read: %lld\n",
0751                percpu_counter_sum_positive(&exp->ex_stats.counter[EXP_STATS_IO_READ]));
0752         seq_printf(m, "\tio_write: %lld\n",
0753                percpu_counter_sum_positive(&exp->ex_stats.counter[EXP_STATS_IO_WRITE]));
0754         seq_putc(m, '\n');
0755         return 0;
0756     }
0757     seq_putc(m, '(');
0758     if (test_bit(CACHE_VALID, &h->flags) &&
0759         !test_bit(CACHE_NEGATIVE, &h->flags)) {
0760         exp_flags(m, exp->ex_flags, exp->ex_fsid,
0761               exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
0762         if (exp->ex_uuid) {
0763             int i;
0764             seq_puts(m, ",uuid=");
0765             for (i = 0; i < EX_UUID_LEN; i++) {
0766                 if ((i&3) == 0 && i)
0767                     seq_putc(m, ':');
0768                 seq_printf(m, "%02x", exp->ex_uuid[i]);
0769             }
0770         }
0771         show_secinfo(m, exp);
0772     }
0773     seq_puts(m, ")\n");
0774     return 0;
0775 }
0776 static int svc_export_match(struct cache_head *a, struct cache_head *b)
0777 {
0778     struct svc_export *orig = container_of(a, struct svc_export, h);
0779     struct svc_export *new = container_of(b, struct svc_export, h);
0780     return orig->ex_client == new->ex_client &&
0781         path_equal(&orig->ex_path, &new->ex_path);
0782 }
0783 
0784 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
0785 {
0786     struct svc_export *new = container_of(cnew, struct svc_export, h);
0787     struct svc_export *item = container_of(citem, struct svc_export, h);
0788 
0789     kref_get(&item->ex_client->ref);
0790     new->ex_client = item->ex_client;
0791     new->ex_path = item->ex_path;
0792     path_get(&item->ex_path);
0793     new->ex_fslocs.locations = NULL;
0794     new->ex_fslocs.locations_count = 0;
0795     new->ex_fslocs.migrated = 0;
0796     new->ex_layout_types = 0;
0797     new->ex_uuid = NULL;
0798     new->cd = item->cd;
0799     export_stats_reset(&new->ex_stats);
0800 }
0801 
0802 static void export_update(struct cache_head *cnew, struct cache_head *citem)
0803 {
0804     struct svc_export *new = container_of(cnew, struct svc_export, h);
0805     struct svc_export *item = container_of(citem, struct svc_export, h);
0806     int i;
0807 
0808     new->ex_flags = item->ex_flags;
0809     new->ex_anon_uid = item->ex_anon_uid;
0810     new->ex_anon_gid = item->ex_anon_gid;
0811     new->ex_fsid = item->ex_fsid;
0812     new->ex_devid_map = item->ex_devid_map;
0813     item->ex_devid_map = NULL;
0814     new->ex_uuid = item->ex_uuid;
0815     item->ex_uuid = NULL;
0816     new->ex_fslocs.locations = item->ex_fslocs.locations;
0817     item->ex_fslocs.locations = NULL;
0818     new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
0819     item->ex_fslocs.locations_count = 0;
0820     new->ex_fslocs.migrated = item->ex_fslocs.migrated;
0821     item->ex_fslocs.migrated = 0;
0822     new->ex_layout_types = item->ex_layout_types;
0823     new->ex_nflavors = item->ex_nflavors;
0824     for (i = 0; i < MAX_SECINFO_LIST; i++) {
0825         new->ex_flavors[i] = item->ex_flavors[i];
0826     }
0827 }
0828 
0829 static struct cache_head *svc_export_alloc(void)
0830 {
0831     struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
0832     if (!i)
0833         return NULL;
0834 
0835     if (export_stats_init(&i->ex_stats)) {
0836         kfree(i);
0837         return NULL;
0838     }
0839 
0840     return &i->h;
0841 }
0842 
0843 static const struct cache_detail svc_export_cache_template = {
0844     .owner      = THIS_MODULE,
0845     .hash_size  = EXPORT_HASHMAX,
0846     .name       = "nfsd.export",
0847     .cache_put  = svc_export_put,
0848     .cache_upcall   = svc_export_upcall,
0849     .cache_request  = svc_export_request,
0850     .cache_parse    = svc_export_parse,
0851     .cache_show = svc_export_show,
0852     .match      = svc_export_match,
0853     .init       = svc_export_init,
0854     .update     = export_update,
0855     .alloc      = svc_export_alloc,
0856 };
0857 
0858 static int
0859 svc_export_hash(struct svc_export *exp)
0860 {
0861     int hash;
0862 
0863     hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
0864     hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
0865     hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
0866     return hash;
0867 }
0868 
0869 static struct svc_export *
0870 svc_export_lookup(struct svc_export *exp)
0871 {
0872     struct cache_head *ch;
0873     int hash = svc_export_hash(exp);
0874 
0875     ch = sunrpc_cache_lookup_rcu(exp->cd, &exp->h, hash);
0876     if (ch)
0877         return container_of(ch, struct svc_export, h);
0878     else
0879         return NULL;
0880 }
0881 
0882 static struct svc_export *
0883 svc_export_update(struct svc_export *new, struct svc_export *old)
0884 {
0885     struct cache_head *ch;
0886     int hash = svc_export_hash(old);
0887 
0888     ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
0889     if (ch)
0890         return container_of(ch, struct svc_export, h);
0891     else
0892         return NULL;
0893 }
0894 
0895 
0896 static struct svc_expkey *
0897 exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
0898          u32 *fsidv, struct cache_req *reqp)
0899 {
0900     struct svc_expkey key, *ek;
0901     int err;
0902     
0903     if (!clp)
0904         return ERR_PTR(-ENOENT);
0905 
0906     key.ek_client = clp;
0907     key.ek_fsidtype = fsid_type;
0908     memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
0909 
0910     ek = svc_expkey_lookup(cd, &key);
0911     if (ek == NULL)
0912         return ERR_PTR(-ENOMEM);
0913     err = cache_check(cd, &ek->h, reqp);
0914     if (err) {
0915         trace_nfsd_exp_find_key(&key, err);
0916         return ERR_PTR(err);
0917     }
0918     return ek;
0919 }
0920 
0921 static struct svc_export *
0922 exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
0923         const struct path *path, struct cache_req *reqp)
0924 {
0925     struct svc_export *exp, key;
0926     int err;
0927 
0928     if (!clp)
0929         return ERR_PTR(-ENOENT);
0930 
0931     key.ex_client = clp;
0932     key.ex_path = *path;
0933     key.cd = cd;
0934 
0935     exp = svc_export_lookup(&key);
0936     if (exp == NULL)
0937         return ERR_PTR(-ENOMEM);
0938     err = cache_check(cd, &exp->h, reqp);
0939     if (err) {
0940         trace_nfsd_exp_get_by_name(&key, err);
0941         return ERR_PTR(err);
0942     }
0943     return exp;
0944 }
0945 
0946 /*
0947  * Find the export entry for a given dentry.
0948  */
0949 static struct svc_export *
0950 exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
0951 {
0952     struct dentry *saved = dget(path->dentry);
0953     struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
0954 
0955     while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
0956         struct dentry *parent = dget_parent(path->dentry);
0957         dput(path->dentry);
0958         path->dentry = parent;
0959         exp = exp_get_by_name(cd, clp, path, NULL);
0960     }
0961     dput(path->dentry);
0962     path->dentry = saved;
0963     return exp;
0964 }
0965 
0966 
0967 
0968 /*
0969  * Obtain the root fh on behalf of a client.
0970  * This could be done in user space, but I feel that it adds some safety
0971  * since its harder to fool a kernel module than a user space program.
0972  */
0973 int
0974 exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
0975        struct knfsd_fh *f, int maxsize)
0976 {
0977     struct svc_export   *exp;
0978     struct path     path;
0979     struct inode        *inode;
0980     struct svc_fh       fh;
0981     int         err;
0982     struct nfsd_net     *nn = net_generic(net, nfsd_net_id);
0983     struct cache_detail *cd = nn->svc_export_cache;
0984 
0985     err = -EPERM;
0986     /* NB: we probably ought to check that it's NUL-terminated */
0987     if (kern_path(name, 0, &path)) {
0988         printk("nfsd: exp_rootfh path not found %s", name);
0989         return err;
0990     }
0991     inode = d_inode(path.dentry);
0992 
0993     dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
0994          name, path.dentry, clp->name,
0995          inode->i_sb->s_id, inode->i_ino);
0996     exp = exp_parent(cd, clp, &path);
0997     if (IS_ERR(exp)) {
0998         err = PTR_ERR(exp);
0999         goto out;
1000     }
1001 
1002     /*
1003      * fh must be initialized before calling fh_compose
1004      */
1005     fh_init(&fh, maxsize);
1006     if (fh_compose(&fh, exp, path.dentry, NULL))
1007         err = -EINVAL;
1008     else
1009         err = 0;
1010     memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1011     fh_put(&fh);
1012     exp_put(exp);
1013 out:
1014     path_put(&path);
1015     return err;
1016 }
1017 
1018 static struct svc_export *exp_find(struct cache_detail *cd,
1019                    struct auth_domain *clp, int fsid_type,
1020                    u32 *fsidv, struct cache_req *reqp)
1021 {
1022     struct svc_export *exp;
1023     struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
1024     struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
1025     if (IS_ERR(ek))
1026         return ERR_CAST(ek);
1027 
1028     exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
1029     cache_put(&ek->h, nn->svc_expkey_cache);
1030 
1031     if (IS_ERR(exp))
1032         return ERR_CAST(exp);
1033     return exp;
1034 }
1035 
1036 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1037 {
1038     struct exp_flavor_info *f;
1039     struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1040 
1041     /* legacy gss-only clients are always OK: */
1042     if (exp->ex_client == rqstp->rq_gssclient)
1043         return 0;
1044     /* ip-address based client; check sec= export option: */
1045     for (f = exp->ex_flavors; f < end; f++) {
1046         if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
1047             return 0;
1048     }
1049     /* defaults in absence of sec= options: */
1050     if (exp->ex_nflavors == 0) {
1051         if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
1052             rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
1053             return 0;
1054     }
1055 
1056     /* If the compound op contains a spo_must_allowed op,
1057      * it will be sent with integrity/protection which
1058      * will have to be expressly allowed on mounts that
1059      * don't support it
1060      */
1061 
1062     if (nfsd4_spo_must_allow(rqstp))
1063         return 0;
1064 
1065     return rqstp->rq_vers < 4 ? nfserr_acces : nfserr_wrongsec;
1066 }
1067 
1068 /*
1069  * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1070  * auth_unix client) if it's available and has secinfo information;
1071  * otherwise, will try to use rq_gssclient.
1072  *
1073  * Called from functions that handle requests; functions that do work on
1074  * behalf of mountd are passed a single client name to use, and should
1075  * use exp_get_by_name() or exp_find().
1076  */
1077 struct svc_export *
1078 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1079 {
1080     struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1081     struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1082     struct cache_detail *cd = nn->svc_export_cache;
1083 
1084     if (rqstp->rq_client == NULL)
1085         goto gss;
1086 
1087     /* First try the auth_unix client: */
1088     exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
1089     if (PTR_ERR(exp) == -ENOENT)
1090         goto gss;
1091     if (IS_ERR(exp))
1092         return exp;
1093     /* If it has secinfo, assume there are no gss/... clients */
1094     if (exp->ex_nflavors > 0)
1095         return exp;
1096 gss:
1097     /* Otherwise, try falling back on gss client */
1098     if (rqstp->rq_gssclient == NULL)
1099         return exp;
1100     gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1101     if (PTR_ERR(gssexp) == -ENOENT)
1102         return exp;
1103     if (!IS_ERR(exp))
1104         exp_put(exp);
1105     return gssexp;
1106 }
1107 
1108 struct svc_export *
1109 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1110 {
1111     struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1112     struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1113     struct cache_detail *cd = nn->svc_export_cache;
1114 
1115     if (rqstp->rq_client == NULL)
1116         goto gss;
1117 
1118     /* First try the auth_unix client: */
1119     exp = exp_find(cd, rqstp->rq_client, fsid_type,
1120                fsidv, &rqstp->rq_chandle);
1121     if (PTR_ERR(exp) == -ENOENT)
1122         goto gss;
1123     if (IS_ERR(exp))
1124         return exp;
1125     /* If it has secinfo, assume there are no gss/... clients */
1126     if (exp->ex_nflavors > 0)
1127         return exp;
1128 gss:
1129     /* Otherwise, try falling back on gss client */
1130     if (rqstp->rq_gssclient == NULL)
1131         return exp;
1132     gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1133                         &rqstp->rq_chandle);
1134     if (PTR_ERR(gssexp) == -ENOENT)
1135         return exp;
1136     if (!IS_ERR(exp))
1137         exp_put(exp);
1138     return gssexp;
1139 }
1140 
1141 struct svc_export *
1142 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1143 {
1144     struct dentry *saved = dget(path->dentry);
1145     struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1146 
1147     while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1148         struct dentry *parent = dget_parent(path->dentry);
1149         dput(path->dentry);
1150         path->dentry = parent;
1151         exp = rqst_exp_get_by_name(rqstp, path);
1152     }
1153     dput(path->dentry);
1154     path->dentry = saved;
1155     return exp;
1156 }
1157 
1158 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1159 {
1160     u32 fsidv[2];
1161 
1162     mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1163 
1164     return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1165 }
1166 
1167 /*
1168  * Called when we need the filehandle for the root of the pseudofs,
1169  * for a given NFSv4 client.   The root is defined to be the
1170  * export point with fsid==0
1171  */
1172 __be32
1173 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1174 {
1175     struct svc_export *exp;
1176     __be32 rv;
1177 
1178     exp = rqst_find_fsidzero_export(rqstp);
1179     if (IS_ERR(exp))
1180         return nfserrno(PTR_ERR(exp));
1181     rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1182     exp_put(exp);
1183     return rv;
1184 }
1185 
1186 static struct flags {
1187     int flag;
1188     char *name[2];
1189 } expflags[] = {
1190     { NFSEXP_READONLY, {"ro", "rw"}},
1191     { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1192     { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1193     { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1194     { NFSEXP_ASYNC, {"async", "sync"}},
1195     { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1196     { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1197     { NFSEXP_NOHIDE, {"nohide", ""}},
1198     { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1199     { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1200     { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1201     { NFSEXP_V4ROOT, {"v4root", ""}},
1202     { NFSEXP_PNFS, {"pnfs", ""}},
1203     { NFSEXP_SECURITY_LABEL, {"security_label", ""}},
1204     { 0, {"", ""}}
1205 };
1206 
1207 static void show_expflags(struct seq_file *m, int flags, int mask)
1208 {
1209     struct flags *flg;
1210     int state, first = 0;
1211 
1212     for (flg = expflags; flg->flag; flg++) {
1213         if (flg->flag & ~mask)
1214             continue;
1215         state = (flg->flag & flags) ? 0 : 1;
1216         if (*flg->name[state])
1217             seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1218     }
1219 }
1220 
1221 static void show_secinfo_flags(struct seq_file *m, int flags)
1222 {
1223     seq_printf(m, ",");
1224     show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1225 }
1226 
1227 static bool secinfo_flags_equal(int f, int g)
1228 {
1229     f &= NFSEXP_SECINFO_FLAGS;
1230     g &= NFSEXP_SECINFO_FLAGS;
1231     return f == g;
1232 }
1233 
1234 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1235 {
1236     int flags;
1237 
1238     flags = (*fp)->flags;
1239     seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1240     (*fp)++;
1241     while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1242         seq_printf(m, ":%d", (*fp)->pseudoflavor);
1243         (*fp)++;
1244     }
1245     return flags;
1246 }
1247 
1248 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1249 {
1250     struct exp_flavor_info *f;
1251     struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1252     int flags;
1253 
1254     if (exp->ex_nflavors == 0)
1255         return;
1256     f = exp->ex_flavors;
1257     flags = show_secinfo_run(m, &f, end);
1258     if (!secinfo_flags_equal(flags, exp->ex_flags))
1259         show_secinfo_flags(m, flags);
1260     while (f != end) {
1261         flags = show_secinfo_run(m, &f, end);
1262         show_secinfo_flags(m, flags);
1263     }
1264 }
1265 
1266 static void exp_flags(struct seq_file *m, int flag, int fsid,
1267         kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1268 {
1269     struct user_namespace *userns = m->file->f_cred->user_ns;
1270 
1271     show_expflags(m, flag, NFSEXP_ALLFLAGS);
1272     if (flag & NFSEXP_FSID)
1273         seq_printf(m, ",fsid=%d", fsid);
1274     if (!uid_eq(anonu, make_kuid(userns, (uid_t)-2)) &&
1275         !uid_eq(anonu, make_kuid(userns, 0x10000-2)))
1276         seq_printf(m, ",anonuid=%u", from_kuid_munged(userns, anonu));
1277     if (!gid_eq(anong, make_kgid(userns, (gid_t)-2)) &&
1278         !gid_eq(anong, make_kgid(userns, 0x10000-2)))
1279         seq_printf(m, ",anongid=%u", from_kgid_munged(userns, anong));
1280     if (fsloc && fsloc->locations_count > 0) {
1281         char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1282         int i;
1283 
1284         seq_printf(m, ",%s=", loctype);
1285         seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1286         seq_putc(m, '@');
1287         seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1288         for (i = 1; i < fsloc->locations_count; i++) {
1289             seq_putc(m, ';');
1290             seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1291             seq_putc(m, '@');
1292             seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1293         }
1294     }
1295 }
1296 
1297 static int e_show(struct seq_file *m, void *p)
1298 {
1299     struct cache_head *cp = p;
1300     struct svc_export *exp = container_of(cp, struct svc_export, h);
1301     struct cache_detail *cd = m->private;
1302     bool export_stats = is_export_stats_file(m);
1303 
1304     if (p == SEQ_START_TOKEN) {
1305         seq_puts(m, "# Version 1.1\n");
1306         if (export_stats)
1307             seq_puts(m, "# Path Client Start-time\n#\tStats\n");
1308         else
1309             seq_puts(m, "# Path Client(Flags) # IPs\n");
1310         return 0;
1311     }
1312 
1313     exp_get(exp);
1314     if (cache_check(cd, &exp->h, NULL))
1315         return 0;
1316     exp_put(exp);
1317     return svc_export_show(m, cd, cp);
1318 }
1319 
1320 const struct seq_operations nfs_exports_op = {
1321     .start  = cache_seq_start_rcu,
1322     .next   = cache_seq_next_rcu,
1323     .stop   = cache_seq_stop_rcu,
1324     .show   = e_show,
1325 };
1326 
1327 /*
1328  * Initialize the exports module.
1329  */
1330 int
1331 nfsd_export_init(struct net *net)
1332 {
1333     int rv;
1334     struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1335 
1336     dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
1337 
1338     nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1339     if (IS_ERR(nn->svc_export_cache))
1340         return PTR_ERR(nn->svc_export_cache);
1341     rv = cache_register_net(nn->svc_export_cache, net);
1342     if (rv)
1343         goto destroy_export_cache;
1344 
1345     nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1346     if (IS_ERR(nn->svc_expkey_cache)) {
1347         rv = PTR_ERR(nn->svc_expkey_cache);
1348         goto unregister_export_cache;
1349     }
1350     rv = cache_register_net(nn->svc_expkey_cache, net);
1351     if (rv)
1352         goto destroy_expkey_cache;
1353     return 0;
1354 
1355 destroy_expkey_cache:
1356     cache_destroy_net(nn->svc_expkey_cache, net);
1357 unregister_export_cache:
1358     cache_unregister_net(nn->svc_export_cache, net);
1359 destroy_export_cache:
1360     cache_destroy_net(nn->svc_export_cache, net);
1361     return rv;
1362 }
1363 
1364 /*
1365  * Flush exports table - called when last nfsd thread is killed
1366  */
1367 void
1368 nfsd_export_flush(struct net *net)
1369 {
1370     struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1371 
1372     cache_purge(nn->svc_expkey_cache);
1373     cache_purge(nn->svc_export_cache);
1374 }
1375 
1376 /*
1377  * Shutdown the exports module.
1378  */
1379 void
1380 nfsd_export_shutdown(struct net *net)
1381 {
1382     struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1383 
1384     dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
1385 
1386     cache_unregister_net(nn->svc_expkey_cache, net);
1387     cache_unregister_net(nn->svc_export_cache, net);
1388     cache_destroy_net(nn->svc_expkey_cache, net);
1389     cache_destroy_net(nn->svc_export_cache, net);
1390     svcauth_unix_purge(net);
1391 
1392     dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
1393 }
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