![Trond Myklebust](/assets/img/avatar_default.png)
For events that are rare, such as referral DNS lookups, it makes limited sense to have a daemon constantly listening for upcalls on a channel. An alternative in those cases might simply be to run the app that fills the cache using call_usermodehelper_exec() and friends. The following patch allows the cache_detail to specify alternative upcall mechanisms for these particular cases. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
686 lines
15 KiB
C
686 lines
15 KiB
C
/*
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* fs/nfsd/nfs4idmap.c
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*
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* Mapping of UID/GIDs to name and vice versa.
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*
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* Copyright (c) 2002, 2003 The Regents of the University of
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* Michigan. All rights reserved.
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*
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* Marius Aamodt Eriksen <marius@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/utsname.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfs.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_page.h>
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#include <linux/sunrpc/cache.h>
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#include <linux/nfsd_idmap.h>
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#include <linux/list.h>
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#include <linux/time.h>
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#include <linux/seq_file.h>
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#include <linux/sunrpc/svcauth.h>
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/*
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* Cache entry
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*/
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/*
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* XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
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* that.
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*/
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#define IDMAP_TYPE_USER 0
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#define IDMAP_TYPE_GROUP 1
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struct ent {
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struct cache_head h;
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int type; /* User / Group */
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uid_t id;
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char name[IDMAP_NAMESZ];
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char authname[IDMAP_NAMESZ];
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};
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/* Common entry handling */
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#define ENT_HASHBITS 8
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#define ENT_HASHMAX (1 << ENT_HASHBITS)
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#define ENT_HASHMASK (ENT_HASHMAX - 1)
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static void
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ent_init(struct cache_head *cnew, struct cache_head *citm)
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{
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struct ent *new = container_of(cnew, struct ent, h);
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struct ent *itm = container_of(citm, struct ent, h);
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new->id = itm->id;
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new->type = itm->type;
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strlcpy(new->name, itm->name, sizeof(new->name));
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strlcpy(new->authname, itm->authname, sizeof(new->name));
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}
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static void
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ent_put(struct kref *ref)
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{
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struct ent *map = container_of(ref, struct ent, h.ref);
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kfree(map);
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}
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static struct cache_head *
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ent_alloc(void)
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{
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struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
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if (e)
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return &e->h;
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else
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return NULL;
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}
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/*
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* ID -> Name cache
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*/
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static struct cache_head *idtoname_table[ENT_HASHMAX];
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static uint32_t
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idtoname_hash(struct ent *ent)
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{
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uint32_t hash;
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hash = hash_str(ent->authname, ENT_HASHBITS);
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hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
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/* Flip LSB for user/group */
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if (ent->type == IDMAP_TYPE_GROUP)
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hash ^= 1;
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return hash;
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}
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static void
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idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
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int *blen)
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{
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struct ent *ent = container_of(ch, struct ent, h);
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char idstr[11];
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qword_add(bpp, blen, ent->authname);
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snprintf(idstr, sizeof(idstr), "%u", ent->id);
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qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
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qword_add(bpp, blen, idstr);
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(*bpp)[-1] = '\n';
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}
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static int
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idtoname_upcall(struct cache_detail *cd, struct cache_head *ch)
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{
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return sunrpc_cache_pipe_upcall(cd, ch, idtoname_request);
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}
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static int
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idtoname_match(struct cache_head *ca, struct cache_head *cb)
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{
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struct ent *a = container_of(ca, struct ent, h);
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struct ent *b = container_of(cb, struct ent, h);
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return (a->id == b->id && a->type == b->type &&
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strcmp(a->authname, b->authname) == 0);
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}
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static int
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idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
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{
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struct ent *ent;
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if (h == NULL) {
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seq_puts(m, "#domain type id [name]\n");
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return 0;
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}
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ent = container_of(h, struct ent, h);
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seq_printf(m, "%s %s %u", ent->authname,
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ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
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ent->id);
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if (test_bit(CACHE_VALID, &h->flags))
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seq_printf(m, " %s", ent->name);
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seq_printf(m, "\n");
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return 0;
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}
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static void
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warn_no_idmapd(struct cache_detail *detail, int has_died)
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{
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printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
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has_died ? "died" : "not been started");
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}
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static int idtoname_parse(struct cache_detail *, char *, int);
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static struct ent *idtoname_lookup(struct ent *);
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static struct ent *idtoname_update(struct ent *, struct ent *);
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static struct cache_detail idtoname_cache = {
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.owner = THIS_MODULE,
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.hash_size = ENT_HASHMAX,
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.hash_table = idtoname_table,
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.name = "nfs4.idtoname",
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.cache_put = ent_put,
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.cache_upcall = idtoname_upcall,
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.cache_parse = idtoname_parse,
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.cache_show = idtoname_show,
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.warn_no_listener = warn_no_idmapd,
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.match = idtoname_match,
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.init = ent_init,
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.update = ent_init,
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.alloc = ent_alloc,
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};
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static int
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idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
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{
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struct ent ent, *res;
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char *buf1, *bp;
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int len;
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int error = -EINVAL;
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if (buf[buflen - 1] != '\n')
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return (-EINVAL);
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buf[buflen - 1]= '\0';
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buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (buf1 == NULL)
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return (-ENOMEM);
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memset(&ent, 0, sizeof(ent));
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/* Authentication name */
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
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goto out;
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memcpy(ent.authname, buf1, sizeof(ent.authname));
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/* Type */
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
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goto out;
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ent.type = strcmp(buf1, "user") == 0 ?
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IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
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/* ID */
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
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goto out;
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ent.id = simple_strtoul(buf1, &bp, 10);
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if (bp == buf1)
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goto out;
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/* expiry */
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ent.h.expiry_time = get_expiry(&buf);
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if (ent.h.expiry_time == 0)
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goto out;
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error = -ENOMEM;
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res = idtoname_lookup(&ent);
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if (!res)
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goto out;
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/* Name */
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error = -EINVAL;
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len = qword_get(&buf, buf1, PAGE_SIZE);
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if (len < 0)
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goto out;
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if (len == 0)
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set_bit(CACHE_NEGATIVE, &ent.h.flags);
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else if (len >= IDMAP_NAMESZ)
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goto out;
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else
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memcpy(ent.name, buf1, sizeof(ent.name));
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error = -ENOMEM;
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res = idtoname_update(&ent, res);
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if (res == NULL)
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goto out;
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cache_put(&res->h, &idtoname_cache);
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error = 0;
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out:
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kfree(buf1);
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return error;
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}
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static struct ent *
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idtoname_lookup(struct ent *item)
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{
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struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache,
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&item->h,
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idtoname_hash(item));
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if (ch)
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return container_of(ch, struct ent, h);
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else
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return NULL;
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}
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static struct ent *
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idtoname_update(struct ent *new, struct ent *old)
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{
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struct cache_head *ch = sunrpc_cache_update(&idtoname_cache,
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&new->h, &old->h,
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idtoname_hash(new));
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if (ch)
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return container_of(ch, struct ent, h);
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else
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return NULL;
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}
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/*
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* Name -> ID cache
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*/
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static struct cache_head *nametoid_table[ENT_HASHMAX];
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static inline int
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nametoid_hash(struct ent *ent)
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{
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return hash_str(ent->name, ENT_HASHBITS);
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}
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static void
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nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
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int *blen)
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{
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struct ent *ent = container_of(ch, struct ent, h);
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qword_add(bpp, blen, ent->authname);
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qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
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qword_add(bpp, blen, ent->name);
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(*bpp)[-1] = '\n';
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}
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static int
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nametoid_upcall(struct cache_detail *cd, struct cache_head *ch)
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{
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return sunrpc_cache_pipe_upcall(cd, ch, nametoid_request);
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}
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static int
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nametoid_match(struct cache_head *ca, struct cache_head *cb)
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{
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struct ent *a = container_of(ca, struct ent, h);
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struct ent *b = container_of(cb, struct ent, h);
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return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
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strcmp(a->authname, b->authname) == 0);
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}
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static int
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nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
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{
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struct ent *ent;
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if (h == NULL) {
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seq_puts(m, "#domain type name [id]\n");
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return 0;
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}
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ent = container_of(h, struct ent, h);
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seq_printf(m, "%s %s %s", ent->authname,
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ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
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ent->name);
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if (test_bit(CACHE_VALID, &h->flags))
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seq_printf(m, " %u", ent->id);
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seq_printf(m, "\n");
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return 0;
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}
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static struct ent *nametoid_lookup(struct ent *);
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static struct ent *nametoid_update(struct ent *, struct ent *);
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static int nametoid_parse(struct cache_detail *, char *, int);
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static struct cache_detail nametoid_cache = {
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.owner = THIS_MODULE,
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.hash_size = ENT_HASHMAX,
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.hash_table = nametoid_table,
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.name = "nfs4.nametoid",
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.cache_put = ent_put,
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.cache_upcall = nametoid_upcall,
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.cache_parse = nametoid_parse,
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.cache_show = nametoid_show,
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.warn_no_listener = warn_no_idmapd,
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.match = nametoid_match,
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.init = ent_init,
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.update = ent_init,
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.alloc = ent_alloc,
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};
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static int
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nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
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{
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struct ent ent, *res;
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char *buf1;
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int error = -EINVAL;
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if (buf[buflen - 1] != '\n')
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return (-EINVAL);
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buf[buflen - 1]= '\0';
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buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (buf1 == NULL)
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return (-ENOMEM);
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memset(&ent, 0, sizeof(ent));
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/* Authentication name */
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
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goto out;
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memcpy(ent.authname, buf1, sizeof(ent.authname));
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/* Type */
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
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goto out;
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ent.type = strcmp(buf1, "user") == 0 ?
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IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
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/* Name */
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error = qword_get(&buf, buf1, PAGE_SIZE);
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if (error <= 0 || error >= IDMAP_NAMESZ)
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goto out;
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memcpy(ent.name, buf1, sizeof(ent.name));
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/* expiry */
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ent.h.expiry_time = get_expiry(&buf);
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if (ent.h.expiry_time == 0)
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goto out;
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/* ID */
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error = get_int(&buf, &ent.id);
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if (error == -EINVAL)
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goto out;
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if (error == -ENOENT)
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set_bit(CACHE_NEGATIVE, &ent.h.flags);
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error = -ENOMEM;
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res = nametoid_lookup(&ent);
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if (res == NULL)
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goto out;
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res = nametoid_update(&ent, res);
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if (res == NULL)
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goto out;
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cache_put(&res->h, &nametoid_cache);
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error = 0;
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out:
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kfree(buf1);
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return (error);
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}
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static struct ent *
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nametoid_lookup(struct ent *item)
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{
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struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache,
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&item->h,
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nametoid_hash(item));
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if (ch)
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return container_of(ch, struct ent, h);
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else
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return NULL;
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}
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static struct ent *
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nametoid_update(struct ent *new, struct ent *old)
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{
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struct cache_head *ch = sunrpc_cache_update(&nametoid_cache,
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&new->h, &old->h,
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nametoid_hash(new));
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if (ch)
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return container_of(ch, struct ent, h);
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else
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return NULL;
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}
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/*
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* Exported API
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*/
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int
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nfsd_idmap_init(void)
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{
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int rv;
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rv = cache_register(&idtoname_cache);
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if (rv)
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return rv;
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rv = cache_register(&nametoid_cache);
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if (rv)
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cache_unregister(&idtoname_cache);
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return rv;
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}
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void
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nfsd_idmap_shutdown(void)
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{
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cache_unregister(&idtoname_cache);
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cache_unregister(&nametoid_cache);
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}
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/*
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* Deferred request handling
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*/
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struct idmap_defer_req {
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struct cache_req req;
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struct cache_deferred_req deferred_req;
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wait_queue_head_t waitq;
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atomic_t count;
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};
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static inline void
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put_mdr(struct idmap_defer_req *mdr)
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{
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if (atomic_dec_and_test(&mdr->count))
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kfree(mdr);
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}
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static inline void
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get_mdr(struct idmap_defer_req *mdr)
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{
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atomic_inc(&mdr->count);
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}
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static void
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idmap_revisit(struct cache_deferred_req *dreq, int toomany)
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{
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struct idmap_defer_req *mdr =
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container_of(dreq, struct idmap_defer_req, deferred_req);
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wake_up(&mdr->waitq);
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put_mdr(mdr);
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}
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static struct cache_deferred_req *
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idmap_defer(struct cache_req *req)
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{
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struct idmap_defer_req *mdr =
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container_of(req, struct idmap_defer_req, req);
|
|
|
|
mdr->deferred_req.revisit = idmap_revisit;
|
|
get_mdr(mdr);
|
|
return (&mdr->deferred_req);
|
|
}
|
|
|
|
static inline int
|
|
do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *), struct ent *key,
|
|
struct cache_detail *detail, struct ent **item,
|
|
struct idmap_defer_req *mdr)
|
|
{
|
|
*item = lookup_fn(key);
|
|
if (!*item)
|
|
return -ENOMEM;
|
|
return cache_check(detail, &(*item)->h, &mdr->req);
|
|
}
|
|
|
|
static inline int
|
|
do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *),
|
|
struct ent *key, struct cache_detail *detail,
|
|
struct ent **item)
|
|
{
|
|
int ret = -ENOMEM;
|
|
|
|
*item = lookup_fn(key);
|
|
if (!*item)
|
|
goto out_err;
|
|
ret = -ETIMEDOUT;
|
|
if (!test_bit(CACHE_VALID, &(*item)->h.flags)
|
|
|| (*item)->h.expiry_time < get_seconds()
|
|
|| detail->flush_time > (*item)->h.last_refresh)
|
|
goto out_put;
|
|
ret = -ENOENT;
|
|
if (test_bit(CACHE_NEGATIVE, &(*item)->h.flags))
|
|
goto out_put;
|
|
return 0;
|
|
out_put:
|
|
cache_put(&(*item)->h, detail);
|
|
out_err:
|
|
*item = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
idmap_lookup(struct svc_rqst *rqstp,
|
|
struct ent *(*lookup_fn)(struct ent *), struct ent *key,
|
|
struct cache_detail *detail, struct ent **item)
|
|
{
|
|
struct idmap_defer_req *mdr;
|
|
int ret;
|
|
|
|
mdr = kzalloc(sizeof(*mdr), GFP_KERNEL);
|
|
if (!mdr)
|
|
return -ENOMEM;
|
|
atomic_set(&mdr->count, 1);
|
|
init_waitqueue_head(&mdr->waitq);
|
|
mdr->req.defer = idmap_defer;
|
|
ret = do_idmap_lookup(lookup_fn, key, detail, item, mdr);
|
|
if (ret == -EAGAIN) {
|
|
wait_event_interruptible_timeout(mdr->waitq,
|
|
test_bit(CACHE_VALID, &(*item)->h.flags), 1 * HZ);
|
|
ret = do_idmap_lookup_nowait(lookup_fn, key, detail, item);
|
|
}
|
|
put_mdr(mdr);
|
|
return ret;
|
|
}
|
|
|
|
static char *
|
|
rqst_authname(struct svc_rqst *rqstp)
|
|
{
|
|
struct auth_domain *clp;
|
|
|
|
clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
|
|
return clp->name;
|
|
}
|
|
|
|
static int
|
|
idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
|
|
uid_t *id)
|
|
{
|
|
struct ent *item, key = {
|
|
.type = type,
|
|
};
|
|
int ret;
|
|
|
|
if (namelen + 1 > sizeof(key.name))
|
|
return -EINVAL;
|
|
memcpy(key.name, name, namelen);
|
|
key.name[namelen] = '\0';
|
|
strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
|
|
ret = idmap_lookup(rqstp, nametoid_lookup, &key, &nametoid_cache, &item);
|
|
if (ret == -ENOENT)
|
|
ret = -ESRCH; /* nfserr_badname */
|
|
if (ret)
|
|
return ret;
|
|
*id = item->id;
|
|
cache_put(&item->h, &nametoid_cache);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name)
|
|
{
|
|
struct ent *item, key = {
|
|
.id = id,
|
|
.type = type,
|
|
};
|
|
int ret;
|
|
|
|
strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
|
|
ret = idmap_lookup(rqstp, idtoname_lookup, &key, &idtoname_cache, &item);
|
|
if (ret == -ENOENT)
|
|
return sprintf(name, "%u", id);
|
|
if (ret)
|
|
return ret;
|
|
ret = strlen(item->name);
|
|
BUG_ON(ret > IDMAP_NAMESZ);
|
|
memcpy(name, item->name, ret);
|
|
cache_put(&item->h, &idtoname_cache);
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
|
|
__u32 *id)
|
|
{
|
|
return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id);
|
|
}
|
|
|
|
int
|
|
nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
|
|
__u32 *id)
|
|
{
|
|
return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id);
|
|
}
|
|
|
|
int
|
|
nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
|
|
{
|
|
return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
|
|
}
|
|
|
|
int
|
|
nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
|
|
{
|
|
return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
|
|
}
|