| #define MSNFS /* HACK HACK */ |
| /* |
| * linux/fs/nfsd/export.c |
| * |
| * NFS exporting and validation. |
| * |
| * We maintain a list of clients, each of which has a list of |
| * exports. To export an fs to a given client, you first have |
| * to create the client entry with NFSCTL_ADDCLIENT, which |
| * creates a client control block and adds it to the hash |
| * table. Then, you call NFSCTL_EXPORT for each fs. |
| * |
| * |
| * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de> |
| */ |
| |
| #include <linux/unistd.h> |
| #include <linux/slab.h> |
| #include <linux/sched.h> |
| #include <linux/stat.h> |
| #include <linux/in.h> |
| #include <linux/seq_file.h> |
| #include <linux/syscalls.h> |
| #include <linux/rwsem.h> |
| #include <linux/dcache.h> |
| #include <linux/namei.h> |
| #include <linux/mount.h> |
| #include <linux/hash.h> |
| #include <linux/module.h> |
| |
| #include <linux/sunrpc/svc.h> |
| #include <linux/nfsd/nfsd.h> |
| #include <linux/nfsd/nfsfh.h> |
| #include <linux/nfsd/syscall.h> |
| #include <linux/lockd/bind.h> |
| |
| #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
| #define NFSD_PARANOIA 1 |
| |
| typedef struct auth_domain svc_client; |
| typedef struct svc_export svc_export; |
| |
| static void exp_do_unexport(svc_export *unexp); |
| static int exp_verify_string(char *cp, int max); |
| |
| /* |
| * We have two caches. |
| * One maps client+vfsmnt+dentry to export options - the export map |
| * The other maps client+filehandle-fragment to export options. - the expkey map |
| * |
| * The export options are actually stored in the first map, and the |
| * second map contains a reference to the entry in the first map. |
| */ |
| |
| #define EXPKEY_HASHBITS 8 |
| #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) |
| #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) |
| static struct cache_head *expkey_table[EXPKEY_HASHMAX]; |
| |
| static void expkey_put(struct kref *ref) |
| { |
| struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
| |
| if (test_bit(CACHE_VALID, &key->h.flags) && |
| !test_bit(CACHE_NEGATIVE, &key->h.flags)) { |
| dput(key->ek_dentry); |
| mntput(key->ek_mnt); |
| } |
| auth_domain_put(key->ek_client); |
| kfree(key); |
| } |
| |
| static void expkey_request(struct cache_detail *cd, |
| struct cache_head *h, |
| char **bpp, int *blen) |
| { |
| /* client fsidtype \xfsid */ |
| struct svc_expkey *ek = container_of(h, struct svc_expkey, h); |
| char type[5]; |
| |
| qword_add(bpp, blen, ek->ek_client->name); |
| snprintf(type, 5, "%d", ek->ek_fsidtype); |
| qword_add(bpp, blen, type); |
| qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); |
| (*bpp)[-1] = '\n'; |
| } |
| |
| static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); |
| static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); |
| static struct cache_detail svc_expkey_cache; |
| |
| static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
| { |
| /* client fsidtype fsid [path] */ |
| char *buf; |
| int len; |
| struct auth_domain *dom = NULL; |
| int err; |
| int fsidtype; |
| char *ep; |
| struct svc_expkey key; |
| struct svc_expkey *ek; |
| |
| if (mesg[mlen-1] != '\n') |
| return -EINVAL; |
| mesg[mlen-1] = 0; |
| |
| buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| err = -ENOMEM; |
| if (!buf) goto out; |
| |
| err = -EINVAL; |
| if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| goto out; |
| |
| err = -ENOENT; |
| dom = auth_domain_find(buf); |
| if (!dom) |
| goto out; |
| dprintk("found domain %s\n", buf); |
| |
| err = -EINVAL; |
| if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| goto out; |
| fsidtype = simple_strtoul(buf, &ep, 10); |
| if (*ep) |
| goto out; |
| dprintk("found fsidtype %d\n", fsidtype); |
| if (key_len(fsidtype)==0) /* invalid type */ |
| goto out; |
| if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| goto out; |
| dprintk("found fsid length %d\n", len); |
| if (len != key_len(fsidtype)) |
| goto out; |
| |
| /* OK, we seem to have a valid key */ |
| key.h.flags = 0; |
| key.h.expiry_time = get_expiry(&mesg); |
| if (key.h.expiry_time == 0) |
| goto out; |
| |
| key.ek_client = dom; |
| key.ek_fsidtype = fsidtype; |
| memcpy(key.ek_fsid, buf, len); |
| |
| ek = svc_expkey_lookup(&key); |
| err = -ENOMEM; |
| if (!ek) |
| goto out; |
| |
| /* now we want a pathname, or empty meaning NEGATIVE */ |
| err = -EINVAL; |
| if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) |
| goto out; |
| dprintk("Path seems to be <%s>\n", buf); |
| err = 0; |
| if (len == 0) { |
| set_bit(CACHE_NEGATIVE, &key.h.flags); |
| ek = svc_expkey_update(&key, ek); |
| if (ek) |
| cache_put(&ek->h, &svc_expkey_cache); |
| else err = -ENOMEM; |
| } else { |
| struct nameidata nd; |
| err = path_lookup(buf, 0, &nd); |
| if (err) |
| goto out; |
| |
| dprintk("Found the path %s\n", buf); |
| key.ek_mnt = nd.mnt; |
| key.ek_dentry = nd.dentry; |
| |
| ek = svc_expkey_update(&key, ek); |
| if (ek) |
| cache_put(&ek->h, &svc_expkey_cache); |
| else |
| err = -ENOMEM; |
| path_release(&nd); |
| } |
| cache_flush(); |
| out: |
| if (dom) |
| auth_domain_put(dom); |
| kfree(buf); |
| return err; |
| } |
| |
| static int expkey_show(struct seq_file *m, |
| struct cache_detail *cd, |
| struct cache_head *h) |
| { |
| struct svc_expkey *ek ; |
| |
| if (h ==NULL) { |
| seq_puts(m, "#domain fsidtype fsid [path]\n"); |
| return 0; |
| } |
| ek = container_of(h, struct svc_expkey, h); |
| seq_printf(m, "%s %d 0x%08x", ek->ek_client->name, |
| ek->ek_fsidtype, ek->ek_fsid[0]); |
| if (ek->ek_fsidtype != 1) |
| seq_printf(m, "%08x", ek->ek_fsid[1]); |
| if (ek->ek_fsidtype == 2) |
| seq_printf(m, "%08x", ek->ek_fsid[2]); |
| if (test_bit(CACHE_VALID, &h->flags) && |
| !test_bit(CACHE_NEGATIVE, &h->flags)) { |
| seq_printf(m, " "); |
| seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); |
| } |
| seq_printf(m, "\n"); |
| return 0; |
| } |
| |
| static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
| { |
| struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
| struct svc_expkey *new = container_of(b, struct svc_expkey, h); |
| |
| if (orig->ek_fsidtype != new->ek_fsidtype || |
| orig->ek_client != new->ek_client || |
| memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) |
| return 0; |
| return 1; |
| } |
| |
| static inline void expkey_init(struct cache_head *cnew, |
| struct cache_head *citem) |
| { |
| struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
| struct svc_expkey *item = container_of(citem, struct svc_expkey, h); |
| |
| kref_get(&item->ek_client->ref); |
| new->ek_client = item->ek_client; |
| new->ek_fsidtype = item->ek_fsidtype; |
| new->ek_fsid[0] = item->ek_fsid[0]; |
| new->ek_fsid[1] = item->ek_fsid[1]; |
| new->ek_fsid[2] = item->ek_fsid[2]; |
| } |
| |
| static inline void expkey_update(struct cache_head *cnew, |
| struct cache_head *citem) |
| { |
| struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
| struct svc_expkey *item = container_of(citem, struct svc_expkey, h); |
| |
| new->ek_mnt = mntget(item->ek_mnt); |
| new->ek_dentry = dget(item->ek_dentry); |
| } |
| |
| static struct cache_head *expkey_alloc(void) |
| { |
| struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); |
| if (i) |
| return &i->h; |
| else |
| return NULL; |
| } |
| |
| static struct cache_detail svc_expkey_cache = { |
| .owner = THIS_MODULE, |
| .hash_size = EXPKEY_HASHMAX, |
| .hash_table = expkey_table, |
| .name = "nfsd.fh", |
| .cache_put = expkey_put, |
| .cache_request = expkey_request, |
| .cache_parse = expkey_parse, |
| .cache_show = expkey_show, |
| .match = expkey_match, |
| .init = expkey_init, |
| .update = expkey_update, |
| .alloc = expkey_alloc, |
| }; |
| |
| static struct svc_expkey * |
| svc_expkey_lookup(struct svc_expkey *item) |
| { |
| struct cache_head *ch; |
| int hash = item->ek_fsidtype; |
| char * cp = (char*)item->ek_fsid; |
| int len = key_len(item->ek_fsidtype); |
| |
| hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); |
| hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); |
| hash &= EXPKEY_HASHMASK; |
| |
| ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, |
| hash); |
| if (ch) |
| return container_of(ch, struct svc_expkey, h); |
| else |
| return NULL; |
| } |
| |
| static struct svc_expkey * |
| svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) |
| { |
| struct cache_head *ch; |
| int hash = new->ek_fsidtype; |
| char * cp = (char*)new->ek_fsid; |
| int len = key_len(new->ek_fsidtype); |
| |
| hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); |
| hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS); |
| hash &= EXPKEY_HASHMASK; |
| |
| ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, |
| &old->h, hash); |
| if (ch) |
| return container_of(ch, struct svc_expkey, h); |
| else |
| return NULL; |
| } |
| |
| |
| #define EXPORT_HASHBITS 8 |
| #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) |
| #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) |
| |
| static struct cache_head *export_table[EXPORT_HASHMAX]; |
| |
| static void svc_export_put(struct kref *ref) |
| { |
| struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
| dput(exp->ex_dentry); |
| mntput(exp->ex_mnt); |
| auth_domain_put(exp->ex_client); |
| kfree(exp); |
| } |
| |
| static void svc_export_request(struct cache_detail *cd, |
| struct cache_head *h, |
| char **bpp, int *blen) |
| { |
| /* client path */ |
| struct svc_export *exp = container_of(h, struct svc_export, h); |
| char *pth; |
| |
| qword_add(bpp, blen, exp->ex_client->name); |
| pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); |
| if (IS_ERR(pth)) { |
| /* is this correct? */ |
| (*bpp)[0] = '\n'; |
| return; |
| } |
| qword_add(bpp, blen, pth); |
| (*bpp)[-1] = '\n'; |
| } |
| |
| static struct svc_export *svc_export_update(struct svc_export *new, |
| struct svc_export *old); |
| static struct svc_export *svc_export_lookup(struct svc_export *); |
| |
| static int check_export(struct inode *inode, int flags) |
| { |
| |
| /* We currently export only dirs and regular files. |
| * This is what umountd does. |
| */ |
| if (!S_ISDIR(inode->i_mode) && |
| !S_ISREG(inode->i_mode)) |
| return -ENOTDIR; |
| |
| /* There are two requirements on a filesystem to be exportable. |
| * 1: We must be able to identify the filesystem from a number. |
| * either a device number (so FS_REQUIRES_DEV needed) |
| * or an FSID number (so NFSEXP_FSID needed). |
| * 2: We must be able to find an inode from a filehandle. |
| * This means that s_export_op must be set. |
| */ |
| if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && |
| !(flags & NFSEXP_FSID)) { |
| dprintk("exp_export: export of non-dev fs without fsid\n"); |
| return -EINVAL; |
| } |
| if (!inode->i_sb->s_export_op) { |
| dprintk("exp_export: export of invalid fs type.\n"); |
| return -EINVAL; |
| } |
| |
| /* Ok, we can export it */; |
| if (!inode->i_sb->s_export_op->find_exported_dentry) |
| inode->i_sb->s_export_op->find_exported_dentry = |
| find_exported_dentry; |
| return 0; |
| |
| } |
| |
| static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
| { |
| /* client path expiry [flags anonuid anongid fsid] */ |
| char *buf; |
| int len; |
| int err; |
| struct auth_domain *dom = NULL; |
| struct nameidata nd; |
| struct svc_export exp, *expp; |
| int an_int; |
| |
| nd.dentry = NULL; |
| |
| if (mesg[mlen-1] != '\n') |
| return -EINVAL; |
| mesg[mlen-1] = 0; |
| |
| buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| err = -ENOMEM; |
| if (!buf) goto out; |
| |
| /* client */ |
| len = qword_get(&mesg, buf, PAGE_SIZE); |
| err = -EINVAL; |
| if (len <= 0) goto out; |
| |
| err = -ENOENT; |
| dom = auth_domain_find(buf); |
| if (!dom) |
| goto out; |
| |
| /* path */ |
| err = -EINVAL; |
| if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| goto out; |
| err = path_lookup(buf, 0, &nd); |
| if (err) goto out_no_path; |
| |
| exp.h.flags = 0; |
| exp.ex_client = dom; |
| exp.ex_mnt = nd.mnt; |
| exp.ex_dentry = nd.dentry; |
| |
| /* expiry */ |
| err = -EINVAL; |
| exp.h.expiry_time = get_expiry(&mesg); |
| if (exp.h.expiry_time == 0) |
| goto out; |
| |
| /* flags */ |
| err = get_int(&mesg, &an_int); |
| if (err == -ENOENT) |
| set_bit(CACHE_NEGATIVE, &exp.h.flags); |
| else { |
| if (err || an_int < 0) goto out; |
| exp.ex_flags= an_int; |
| |
| /* anon uid */ |
| err = get_int(&mesg, &an_int); |
| if (err) goto out; |
| exp.ex_anon_uid= an_int; |
| |
| /* anon gid */ |
| err = get_int(&mesg, &an_int); |
| if (err) goto out; |
| exp.ex_anon_gid= an_int; |
| |
| /* fsid */ |
| err = get_int(&mesg, &an_int); |
| if (err) goto out; |
| exp.ex_fsid = an_int; |
| |
| err = check_export(nd.dentry->d_inode, exp.ex_flags); |
| if (err) goto out; |
| } |
| |
| expp = svc_export_lookup(&exp); |
| if (expp) |
| expp = svc_export_update(&exp, expp); |
| else |
| err = -ENOMEM; |
| cache_flush(); |
| if (expp == NULL) |
| err = -ENOMEM; |
| else |
| exp_put(expp); |
| out: |
| if (nd.dentry) |
| path_release(&nd); |
| out_no_path: |
| if (dom) |
| auth_domain_put(dom); |
| kfree(buf); |
| return err; |
| } |
| |
| static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong); |
| |
| static int svc_export_show(struct seq_file *m, |
| struct cache_detail *cd, |
| struct cache_head *h) |
| { |
| struct svc_export *exp ; |
| |
| if (h ==NULL) { |
| seq_puts(m, "#path domain(flags)\n"); |
| return 0; |
| } |
| exp = container_of(h, struct svc_export, h); |
| seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); |
| seq_putc(m, '\t'); |
| seq_escape(m, exp->ex_client->name, " \t\n\\"); |
| seq_putc(m, '('); |
| if (test_bit(CACHE_VALID, &h->flags) && |
| !test_bit(CACHE_NEGATIVE, &h->flags)) |
| exp_flags(m, exp->ex_flags, exp->ex_fsid, |
| exp->ex_anon_uid, exp->ex_anon_gid); |
| seq_puts(m, ")\n"); |
| return 0; |
| } |
| static int svc_export_match(struct cache_head *a, struct cache_head *b) |
| { |
| struct svc_export *orig = container_of(a, struct svc_export, h); |
| struct svc_export *new = container_of(b, struct svc_export, h); |
| return orig->ex_client == new->ex_client && |
| orig->ex_dentry == new->ex_dentry && |
| orig->ex_mnt == new->ex_mnt; |
| } |
| |
| static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) |
| { |
| struct svc_export *new = container_of(cnew, struct svc_export, h); |
| struct svc_export *item = container_of(citem, struct svc_export, h); |
| |
| kref_get(&item->ex_client->ref); |
| new->ex_client = item->ex_client; |
| new->ex_dentry = dget(item->ex_dentry); |
| new->ex_mnt = mntget(item->ex_mnt); |
| } |
| |
| static void export_update(struct cache_head *cnew, struct cache_head *citem) |
| { |
| struct svc_export *new = container_of(cnew, struct svc_export, h); |
| struct svc_export *item = container_of(citem, struct svc_export, h); |
| |
| new->ex_flags = item->ex_flags; |
| new->ex_anon_uid = item->ex_anon_uid; |
| new->ex_anon_gid = item->ex_anon_gid; |
| new->ex_fsid = item->ex_fsid; |
| } |
| |
| static struct cache_head *svc_export_alloc(void) |
| { |
| struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); |
| if (i) |
| return &i->h; |
| else |
| return NULL; |
| } |
| |
| struct cache_detail svc_export_cache = { |
| .owner = THIS_MODULE, |
| .hash_size = EXPORT_HASHMAX, |
| .hash_table = export_table, |
| .name = "nfsd.export", |
| .cache_put = svc_export_put, |
| .cache_request = svc_export_request, |
| .cache_parse = svc_export_parse, |
| .cache_show = svc_export_show, |
| .match = svc_export_match, |
| .init = svc_export_init, |
| .update = export_update, |
| .alloc = svc_export_alloc, |
| }; |
| |
| static struct svc_export * |
| svc_export_lookup(struct svc_export *exp) |
| { |
| struct cache_head *ch; |
| int hash; |
| hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
| hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); |
| hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); |
| |
| ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, |
| hash); |
| if (ch) |
| return container_of(ch, struct svc_export, h); |
| else |
| return NULL; |
| } |
| |
| static struct svc_export * |
| svc_export_update(struct svc_export *new, struct svc_export *old) |
| { |
| struct cache_head *ch; |
| int hash; |
| hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); |
| hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); |
| hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); |
| |
| ch = sunrpc_cache_update(&svc_export_cache, &new->h, |
| &old->h, |
| hash); |
| if (ch) |
| return container_of(ch, struct svc_export, h); |
| else |
| return NULL; |
| } |
| |
| |
| static struct svc_expkey * |
| exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
| { |
| struct svc_expkey key, *ek; |
| int err; |
| |
| if (!clp) |
| return NULL; |
| |
| key.ek_client = clp; |
| key.ek_fsidtype = fsid_type; |
| memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); |
| |
| ek = svc_expkey_lookup(&key); |
| if (ek != NULL) |
| if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp))) |
| ek = ERR_PTR(err); |
| return ek; |
| } |
| |
| static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, |
| struct svc_export *exp) |
| { |
| struct svc_expkey key, *ek; |
| |
| key.ek_client = clp; |
| key.ek_fsidtype = fsid_type; |
| memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); |
| key.ek_mnt = exp->ex_mnt; |
| key.ek_dentry = exp->ex_dentry; |
| key.h.expiry_time = NEVER; |
| key.h.flags = 0; |
| |
| ek = svc_expkey_lookup(&key); |
| if (ek) |
| ek = svc_expkey_update(&key,ek); |
| if (ek) { |
| cache_put(&ek->h, &svc_expkey_cache); |
| return 0; |
| } |
| return -ENOMEM; |
| } |
| |
| /* |
| * Find the client's export entry matching xdev/xino. |
| */ |
| static inline struct svc_expkey * |
| exp_get_key(svc_client *clp, dev_t dev, ino_t ino) |
| { |
| u32 fsidv[3]; |
| |
| if (old_valid_dev(dev)) { |
| mk_fsid_v0(fsidv, dev, ino); |
| return exp_find_key(clp, 0, fsidv, NULL); |
| } |
| mk_fsid_v3(fsidv, dev, ino); |
| return exp_find_key(clp, 3, fsidv, NULL); |
| } |
| |
| /* |
| * Find the client's export entry matching fsid |
| */ |
| static inline struct svc_expkey * |
| exp_get_fsid_key(svc_client *clp, int fsid) |
| { |
| u32 fsidv[2]; |
| |
| mk_fsid_v1(fsidv, fsid); |
| |
| return exp_find_key(clp, 1, fsidv, NULL); |
| } |
| |
| svc_export * |
| exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, |
| struct cache_req *reqp) |
| { |
| struct svc_export *exp, key; |
| |
| if (!clp) |
| return NULL; |
| |
| key.ex_client = clp; |
| key.ex_mnt = mnt; |
| key.ex_dentry = dentry; |
| |
| exp = svc_export_lookup(&key); |
| if (exp != NULL) |
| switch (cache_check(&svc_export_cache, &exp->h, reqp)) { |
| case 0: break; |
| case -EAGAIN: |
| exp = ERR_PTR(-EAGAIN); |
| break; |
| default: |
| exp = NULL; |
| } |
| |
| return exp; |
| } |
| |
| /* |
| * Find the export entry for a given dentry. |
| */ |
| struct svc_export * |
| exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, |
| struct cache_req *reqp) |
| { |
| svc_export *exp; |
| |
| dget(dentry); |
| exp = exp_get_by_name(clp, mnt, dentry, reqp); |
| |
| while (exp == NULL && !IS_ROOT(dentry)) { |
| struct dentry *parent; |
| |
| parent = dget_parent(dentry); |
| dput(dentry); |
| dentry = parent; |
| exp = exp_get_by_name(clp, mnt, dentry, reqp); |
| } |
| dput(dentry); |
| return exp; |
| } |
| |
| /* |
| * Hashtable locking. Write locks are placed only by user processes |
| * wanting to modify export information. |
| * Write locking only done in this file. Read locking |
| * needed externally. |
| */ |
| |
| static DECLARE_RWSEM(hash_sem); |
| |
| void |
| exp_readlock(void) |
| { |
| down_read(&hash_sem); |
| } |
| |
| static inline void |
| exp_writelock(void) |
| { |
| down_write(&hash_sem); |
| } |
| |
| void |
| exp_readunlock(void) |
| { |
| up_read(&hash_sem); |
| } |
| |
| static inline void |
| exp_writeunlock(void) |
| { |
| up_write(&hash_sem); |
| } |
| |
| static void exp_fsid_unhash(struct svc_export *exp) |
| { |
| struct svc_expkey *ek; |
| |
| if ((exp->ex_flags & NFSEXP_FSID) == 0) |
| return; |
| |
| ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); |
| if (ek && !IS_ERR(ek)) { |
| ek->h.expiry_time = get_seconds()-1; |
| cache_put(&ek->h, &svc_expkey_cache); |
| } |
| svc_expkey_cache.nextcheck = get_seconds(); |
| } |
| |
| static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) |
| { |
| u32 fsid[2]; |
| |
| if ((exp->ex_flags & NFSEXP_FSID) == 0) |
| return 0; |
| |
| mk_fsid_v1(fsid, exp->ex_fsid); |
| return exp_set_key(clp, 1, fsid, exp); |
| } |
| |
| static int exp_hash(struct auth_domain *clp, struct svc_export *exp) |
| { |
| u32 fsid[2]; |
| struct inode *inode = exp->ex_dentry->d_inode; |
| dev_t dev = inode->i_sb->s_dev; |
| |
| if (old_valid_dev(dev)) { |
| mk_fsid_v0(fsid, dev, inode->i_ino); |
| return exp_set_key(clp, 0, fsid, exp); |
| } |
| mk_fsid_v3(fsid, dev, inode->i_ino); |
| return exp_set_key(clp, 3, fsid, exp); |
| } |
| |
| static void exp_unhash(struct svc_export *exp) |
| { |
| struct svc_expkey *ek; |
| struct inode *inode = exp->ex_dentry->d_inode; |
| |
| ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); |
| if (ek && !IS_ERR(ek)) { |
| ek->h.expiry_time = get_seconds()-1; |
| cache_put(&ek->h, &svc_expkey_cache); |
| } |
| svc_expkey_cache.nextcheck = get_seconds(); |
| } |
| |
| /* |
| * Export a file system. |
| */ |
| int |
| exp_export(struct nfsctl_export *nxp) |
| { |
| svc_client *clp; |
| struct svc_export *exp = NULL; |
| struct svc_export new; |
| struct svc_expkey *fsid_key = NULL; |
| struct nameidata nd; |
| int err; |
| |
| /* Consistency check */ |
| err = -EINVAL; |
| if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || |
| !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) |
| goto out; |
| |
| dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", |
| nxp->ex_client, nxp->ex_path, |
| (unsigned)nxp->ex_dev, (long)nxp->ex_ino, |
| nxp->ex_flags); |
| |
| /* Try to lock the export table for update */ |
| exp_writelock(); |
| |
| /* Look up client info */ |
| if (!(clp = auth_domain_find(nxp->ex_client))) |
| goto out_unlock; |
| |
| |
| /* Look up the dentry */ |
| err = path_lookup(nxp->ex_path, 0, &nd); |
| if (err) |
| goto out_unlock; |
| err = -EINVAL; |
| |
| exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); |
| |
| /* must make sure there won't be an ex_fsid clash */ |
| if ((nxp->ex_flags & NFSEXP_FSID) && |
| (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) && |
| !IS_ERR(fsid_key) && |
| fsid_key->ek_mnt && |
| (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) ) |
| goto finish; |
| |
| if (exp) { |
| /* just a flags/id/fsid update */ |
| |
| exp_fsid_unhash(exp); |
| exp->ex_flags = nxp->ex_flags; |
| exp->ex_anon_uid = nxp->ex_anon_uid; |
| exp->ex_anon_gid = nxp->ex_anon_gid; |
| exp->ex_fsid = nxp->ex_dev; |
| |
| err = exp_fsid_hash(clp, exp); |
| goto finish; |
| } |
| |
| err = check_export(nd.dentry->d_inode, nxp->ex_flags); |
| if (err) goto finish; |
| |
| err = -ENOMEM; |
| |
| dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); |
| |
| new.h.expiry_time = NEVER; |
| new.h.flags = 0; |
| new.ex_client = clp; |
| new.ex_mnt = nd.mnt; |
| new.ex_dentry = nd.dentry; |
| new.ex_flags = nxp->ex_flags; |
| new.ex_anon_uid = nxp->ex_anon_uid; |
| new.ex_anon_gid = nxp->ex_anon_gid; |
| new.ex_fsid = nxp->ex_dev; |
| |
| exp = svc_export_lookup(&new); |
| if (exp) |
| exp = svc_export_update(&new, exp); |
| |
| if (!exp) |
| goto finish; |
| |
| if (exp_hash(clp, exp) || |
| exp_fsid_hash(clp, exp)) { |
| /* failed to create at least one index */ |
| exp_do_unexport(exp); |
| cache_flush(); |
| err = -ENOMEM; |
| } |
| |
| finish: |
| if (exp) |
| exp_put(exp); |
| if (fsid_key && !IS_ERR(fsid_key)) |
| cache_put(&fsid_key->h, &svc_expkey_cache); |
| if (clp) |
| auth_domain_put(clp); |
| path_release(&nd); |
| out_unlock: |
| exp_writeunlock(); |
| out: |
| return err; |
| } |
| |
| /* |
| * Unexport a file system. The export entry has already |
| * been removed from the client's list of exported fs's. |
| */ |
| static void |
| exp_do_unexport(svc_export *unexp) |
| { |
| unexp->h.expiry_time = get_seconds()-1; |
| svc_export_cache.nextcheck = get_seconds(); |
| exp_unhash(unexp); |
| exp_fsid_unhash(unexp); |
| } |
| |
| |
| /* |
| * unexport syscall. |
| */ |
| int |
| exp_unexport(struct nfsctl_export *nxp) |
| { |
| struct auth_domain *dom; |
| svc_export *exp; |
| struct nameidata nd; |
| int err; |
| |
| /* Consistency check */ |
| if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || |
| !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) |
| return -EINVAL; |
| |
| exp_writelock(); |
| |
| err = -EINVAL; |
| dom = auth_domain_find(nxp->ex_client); |
| if (!dom) { |
| dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); |
| goto out_unlock; |
| } |
| |
| err = path_lookup(nxp->ex_path, 0, &nd); |
| if (err) |
| goto out_domain; |
| |
| err = -EINVAL; |
| exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); |
| path_release(&nd); |
| if (!exp) |
| goto out_domain; |
| |
| exp_do_unexport(exp); |
| exp_put(exp); |
| err = 0; |
| |
| out_domain: |
| auth_domain_put(dom); |
| cache_flush(); |
| out_unlock: |
| exp_writeunlock(); |
| return err; |
| } |
| |
| /* |
| * Obtain the root fh on behalf of a client. |
| * This could be done in user space, but I feel that it adds some safety |
| * since its harder to fool a kernel module than a user space program. |
| */ |
| int |
| exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) |
| { |
| struct svc_export *exp; |
| struct nameidata nd; |
| struct inode *inode; |
| struct svc_fh fh; |
| int err; |
| |
| err = -EPERM; |
| /* NB: we probably ought to check that it's NUL-terminated */ |
| if (path_lookup(path, 0, &nd)) { |
| printk("nfsd: exp_rootfh path not found %s", path); |
| return err; |
| } |
| inode = nd.dentry->d_inode; |
| |
| dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", |
| path, nd.dentry, clp->name, |
| inode->i_sb->s_id, inode->i_ino); |
| exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); |
| if (!exp) { |
| dprintk("nfsd: exp_rootfh export not found.\n"); |
| goto out; |
| } |
| |
| /* |
| * fh must be initialized before calling fh_compose |
| */ |
| fh_init(&fh, maxsize); |
| if (fh_compose(&fh, exp, nd.dentry, NULL)) |
| err = -EINVAL; |
| else |
| err = 0; |
| memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); |
| fh_put(&fh); |
| exp_put(exp); |
| out: |
| path_release(&nd); |
| return err; |
| } |
| |
| struct svc_export * |
| exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv, |
| struct cache_req *reqp) |
| { |
| struct svc_export *exp; |
| struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); |
| if (!ek || IS_ERR(ek)) |
| return ERR_PTR(PTR_ERR(ek)); |
| |
| exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); |
| cache_put(&ek->h, &svc_expkey_cache); |
| |
| if (!exp || IS_ERR(exp)) |
| return ERR_PTR(PTR_ERR(exp)); |
| return exp; |
| } |
| |
| |
| /* |
| * Called when we need the filehandle for the root of the pseudofs, |
| * for a given NFSv4 client. The root is defined to be the |
| * export point with fsid==0 |
| */ |
| int |
| exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp, |
| struct cache_req *creq) |
| { |
| struct svc_expkey *fsid_key; |
| struct svc_export *exp; |
| int rv; |
| u32 fsidv[2]; |
| |
| mk_fsid_v1(fsidv, 0); |
| |
| fsid_key = exp_find_key(clp, 1, fsidv, creq); |
| if (IS_ERR(fsid_key) && PTR_ERR(fsid_key) == -EAGAIN) |
| return nfserr_dropit; |
| if (!fsid_key || IS_ERR(fsid_key)) |
| return nfserr_perm; |
| |
| exp = exp_get_by_name(clp, fsid_key->ek_mnt, fsid_key->ek_dentry, creq); |
| if (exp == NULL) |
| rv = nfserr_perm; |
| else if (IS_ERR(exp)) |
| rv = nfserrno(PTR_ERR(exp)); |
| else { |
| rv = fh_compose(fhp, exp, |
| fsid_key->ek_dentry, NULL); |
| exp_put(exp); |
| } |
| cache_put(&fsid_key->h, &svc_expkey_cache); |
| return rv; |
| } |
| |
| /* Iterator */ |
| |
| static void *e_start(struct seq_file *m, loff_t *pos) |
| { |
| loff_t n = *pos; |
| unsigned hash, export; |
| struct cache_head *ch; |
| |
| exp_readlock(); |
| read_lock(&svc_export_cache.hash_lock); |
| if (!n--) |
| return SEQ_START_TOKEN; |
| hash = n >> 32; |
| export = n & ((1LL<<32) - 1); |
| |
| |
| for (ch=export_table[hash]; ch; ch=ch->next) |
| if (!export--) |
| return ch; |
| n &= ~((1LL<<32) - 1); |
| do { |
| hash++; |
| n += 1LL<<32; |
| } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); |
| if (hash >= EXPORT_HASHMAX) |
| return NULL; |
| *pos = n+1; |
| return export_table[hash]; |
| } |
| |
| static void *e_next(struct seq_file *m, void *p, loff_t *pos) |
| { |
| struct cache_head *ch = p; |
| int hash = (*pos >> 32); |
| |
| if (p == SEQ_START_TOKEN) |
| hash = 0; |
| else if (ch->next == NULL) { |
| hash++; |
| *pos += 1LL<<32; |
| } else { |
| ++*pos; |
| return ch->next; |
| } |
| *pos &= ~((1LL<<32) - 1); |
| while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { |
| hash++; |
| *pos += 1LL<<32; |
| } |
| if (hash >= EXPORT_HASHMAX) |
| return NULL; |
| ++*pos; |
| return export_table[hash]; |
| } |
| |
| static void e_stop(struct seq_file *m, void *p) |
| { |
| read_unlock(&svc_export_cache.hash_lock); |
| exp_readunlock(); |
| } |
| |
| static struct flags { |
| int flag; |
| char *name[2]; |
| } expflags[] = { |
| { NFSEXP_READONLY, {"ro", "rw"}}, |
| { NFSEXP_INSECURE_PORT, {"insecure", ""}}, |
| { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, |
| { NFSEXP_ALLSQUASH, {"all_squash", ""}}, |
| { NFSEXP_ASYNC, {"async", "sync"}}, |
| { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, |
| { NFSEXP_NOHIDE, {"nohide", ""}}, |
| { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, |
| { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, |
| { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, |
| #ifdef MSNFS |
| { NFSEXP_MSNFS, {"msnfs", ""}}, |
| #endif |
| { 0, {"", ""}} |
| }; |
| |
| static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong) |
| { |
| int first = 0; |
| struct flags *flg; |
| |
| for (flg = expflags; flg->flag; flg++) { |
| int state = (flg->flag & flag)?0:1; |
| if (*flg->name[state]) |
| seq_printf(m, "%s%s", first++?",":"", flg->name[state]); |
| } |
| if (flag & NFSEXP_FSID) |
| seq_printf(m, "%sfsid=%d", first++?",":"", fsid); |
| if (anonu != (uid_t)-2 && anonu != (0x10000-2)) |
| seq_printf(m, "%sanonuid=%d", first++?",":"", anonu); |
| if (anong != (gid_t)-2 && anong != (0x10000-2)) |
| seq_printf(m, "%sanongid=%d", first++?",":"", anong); |
| } |
| |
| static int e_show(struct seq_file *m, void *p) |
| { |
| struct cache_head *cp = p; |
| struct svc_export *exp = container_of(cp, struct svc_export, h); |
| |
| if (p == SEQ_START_TOKEN) { |
| seq_puts(m, "# Version 1.1\n"); |
| seq_puts(m, "# Path Client(Flags) # IPs\n"); |
| return 0; |
| } |
| |
| cache_get(&exp->h); |
| if (cache_check(&svc_export_cache, &exp->h, NULL)) |
| return 0; |
| cache_put(&exp->h, &svc_export_cache); |
| return svc_export_show(m, &svc_export_cache, cp); |
| } |
| |
| struct seq_operations nfs_exports_op = { |
| .start = e_start, |
| .next = e_next, |
| .stop = e_stop, |
| .show = e_show, |
| }; |
| |
| /* |
| * Add or modify a client. |
| * Change requests may involve the list of host addresses. The list of |
| * exports and possibly existing uid maps are left untouched. |
| */ |
| int |
| exp_addclient(struct nfsctl_client *ncp) |
| { |
| struct auth_domain *dom; |
| int i, err; |
| |
| /* First, consistency check. */ |
| err = -EINVAL; |
| if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) |
| goto out; |
| if (ncp->cl_naddr > NFSCLNT_ADDRMAX) |
| goto out; |
| |
| /* Lock the hashtable */ |
| exp_writelock(); |
| |
| dom = unix_domain_find(ncp->cl_ident); |
| |
| err = -ENOMEM; |
| if (!dom) |
| goto out_unlock; |
| |
| /* Insert client into hashtable. */ |
| for (i = 0; i < ncp->cl_naddr; i++) |
| auth_unix_add_addr(ncp->cl_addrlist[i], dom); |
| |
| auth_unix_forget_old(dom); |
| auth_domain_put(dom); |
| |
| err = 0; |
| |
| out_unlock: |
| exp_writeunlock(); |
| out: |
| return err; |
| } |
| |
| /* |
| * Delete a client given an identifier. |
| */ |
| int |
| exp_delclient(struct nfsctl_client *ncp) |
| { |
| int err; |
| struct auth_domain *dom; |
| |
| err = -EINVAL; |
| if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) |
| goto out; |
| |
| /* Lock the hashtable */ |
| exp_writelock(); |
| |
| dom = auth_domain_find(ncp->cl_ident); |
| /* just make sure that no addresses work |
| * and that it will expire soon |
| */ |
| if (dom) { |
| err = auth_unix_forget_old(dom); |
| auth_domain_put(dom); |
| } |
| |
| exp_writeunlock(); |
| out: |
| return err; |
| } |
| |
| /* |
| * Verify that string is non-empty and does not exceed max length. |
| */ |
| static int |
| exp_verify_string(char *cp, int max) |
| { |
| int i; |
| |
| for (i = 0; i < max; i++) |
| if (!cp[i]) |
| return i; |
| cp[i] = 0; |
| printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); |
| return 0; |
| } |
| |
| /* |
| * Initialize the exports module. |
| */ |
| void |
| nfsd_export_init(void) |
| { |
| dprintk("nfsd: initializing export module.\n"); |
| |
| cache_register(&svc_export_cache); |
| cache_register(&svc_expkey_cache); |
| |
| } |
| |
| /* |
| * Flush exports table - called when last nfsd thread is killed |
| */ |
| void |
| nfsd_export_flush(void) |
| { |
| exp_writelock(); |
| cache_purge(&svc_expkey_cache); |
| cache_purge(&svc_export_cache); |
| exp_writeunlock(); |
| } |
| |
| /* |
| * Shutdown the exports module. |
| */ |
| void |
| nfsd_export_shutdown(void) |
| { |
| |
| dprintk("nfsd: shutting down export module.\n"); |
| |
| exp_writelock(); |
| |
| if (cache_unregister(&svc_expkey_cache)) |
| printk(KERN_ERR "nfsd: failed to unregister expkey cache\n"); |
| if (cache_unregister(&svc_export_cache)) |
| printk(KERN_ERR "nfsd: failed to unregister export cache\n"); |
| svcauth_unix_purge(); |
| |
| exp_writeunlock(); |
| dprintk("nfsd: export shutdown complete.\n"); |
| } |