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[fs/lustre-release.git] / lustre / ptlrpc / nodemap_handler.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.gnu.org/licenses/gpl-2.0.html
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (C) 2013, Trustees of Indiana University
24  *
25  * Copyright (c) 2014, Intel Corporation.
26  *
27  * Author: Joshua Walgenbach <jjw@iu.edu>
28  */
29 #include <linux/module.h>
30 #include <linux/sort.h>
31 #include <lnet/nidstr.h>
32 #include <lustre_net.h>
33 #include <lustre_acl.h>
34 #include <lustre_eacl.h>
35 #include <obd_class.h>
36 #include "nodemap_internal.h"
37
38 #define HASH_NODEMAP_BKT_BITS 3
39 #define HASH_NODEMAP_CUR_BITS 3
40 #define HASH_NODEMAP_MAX_BITS 7
41
42 #define DEFAULT_NODEMAP "default"
43
44 /* nodemap proc root proc directory under fs/lustre */
45 struct proc_dir_entry *proc_lustre_nodemap_root;
46
47 /* Copy of config active flag to avoid locking in mapping functions */
48 bool nodemap_active;
49
50 /* Lock protecting the active config, useful primarily when proc and
51  * nodemap_hash might be replaced when loading a new config
52  * Any time the active config is referenced, the lock should be held.
53  */
54 DEFINE_MUTEX(active_config_lock);
55 struct nodemap_config *active_config;
56
57 /**
58  * Nodemap destructor
59  *
60  * \param       nodemap         nodemap to destroy
61  */
62 static void nodemap_destroy(struct lu_nodemap *nodemap)
63 {
64         ENTRY;
65
66         if (nodemap->nm_pde_data != NULL)
67                 lprocfs_nodemap_remove(nodemap->nm_pde_data);
68
69         mutex_lock(&active_config_lock);
70         down_read(&active_config->nmc_range_tree_lock);
71         nm_member_reclassify_nodemap(nodemap);
72         up_read(&active_config->nmc_range_tree_lock);
73
74         write_lock(&nodemap->nm_idmap_lock);
75         idmap_delete_tree(nodemap);
76         write_unlock(&nodemap->nm_idmap_lock);
77
78         mutex_unlock(&active_config_lock);
79
80         if (!list_empty(&nodemap->nm_member_list))
81                 CWARN("nodemap_destroy failed to reclassify all members\n");
82
83         nm_member_delete_list(nodemap);
84
85         OBD_FREE_PTR(nodemap);
86
87         EXIT;
88 }
89
90 /**
91  * Functions used for the cfs_hash
92  */
93 void nodemap_getref(struct lu_nodemap *nodemap)
94 {
95         atomic_inc(&nodemap->nm_refcount);
96         CDEBUG(D_INFO, "GETting nodemap %s(p=%p) : new refcount %d\n",
97                nodemap->nm_name, nodemap, atomic_read(&nodemap->nm_refcount));
98 }
99
100 /**
101  * Destroy nodemap if last reference is put. Should be called outside
102  * active_config_lock
103  */
104 void nodemap_putref(struct lu_nodemap *nodemap)
105 {
106         if (!nodemap)
107                 return;
108
109         LASSERT(atomic_read(&nodemap->nm_refcount) > 0);
110
111         CDEBUG(D_INFO, "PUTting nodemap %s(p=%p) : new refcount %d\n",
112                nodemap->nm_name, nodemap,
113                atomic_read(&nodemap->nm_refcount) - 1);
114
115         if (atomic_dec_and_test(&nodemap->nm_refcount))
116                 nodemap_destroy(nodemap);
117 }
118 EXPORT_SYMBOL(nodemap_putref);
119
120 static __u32 nodemap_hashfn(struct cfs_hash *hash_body,
121                             const void *key, unsigned mask)
122 {
123         return cfs_hash_djb2_hash(key, strlen(key), mask);
124 }
125
126 static void *nodemap_hs_key(struct hlist_node *hnode)
127 {
128         struct lu_nodemap *nodemap;
129
130         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
131
132         return nodemap->nm_name;
133 }
134
135 static int nodemap_hs_keycmp(const void *key,
136                              struct hlist_node *compared_hnode)
137 {
138         char *nodemap_name;
139
140         nodemap_name = nodemap_hs_key(compared_hnode);
141
142         return !strcmp(key, nodemap_name);
143 }
144
145 static void *nodemap_hs_hashobject(struct hlist_node *hnode)
146 {
147         return hlist_entry(hnode, struct lu_nodemap, nm_hash);
148 }
149
150 static void nodemap_hs_get(struct cfs_hash *hs, struct hlist_node *hnode)
151 {
152         struct lu_nodemap *nodemap;
153
154         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
155         nodemap_getref(nodemap);
156 }
157
158 static void nodemap_hs_put_locked(struct cfs_hash *hs,
159                                   struct hlist_node *hnode)
160 {
161         struct lu_nodemap *nodemap;
162
163         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
164         nodemap_putref(nodemap);
165 }
166
167 static struct cfs_hash_ops nodemap_hash_operations = {
168         .hs_hash        = nodemap_hashfn,
169         .hs_key         = nodemap_hs_key,
170         .hs_keycmp      = nodemap_hs_keycmp,
171         .hs_object      = nodemap_hs_hashobject,
172         .hs_get         = nodemap_hs_get,
173         .hs_put_locked  = nodemap_hs_put_locked,
174 };
175
176 /* end of cfs_hash functions */
177
178 /**
179  * Initialize nodemap_hash
180  *
181  * \retval      0               success
182  * \retval      -ENOMEM         cannot create hash
183  */
184 static int nodemap_init_hash(struct nodemap_config *nmc)
185 {
186         nmc->nmc_nodemap_hash = cfs_hash_create("NODEMAP",
187                                                 HASH_NODEMAP_CUR_BITS,
188                                                 HASH_NODEMAP_MAX_BITS,
189                                                 HASH_NODEMAP_BKT_BITS, 0,
190                                                 CFS_HASH_MIN_THETA,
191                                                 CFS_HASH_MAX_THETA,
192                                                 &nodemap_hash_operations,
193                                                 CFS_HASH_DEFAULT);
194
195         if (nmc->nmc_nodemap_hash == NULL) {
196                 CERROR("cannot create nodemap_hash table\n");
197                 return -ENOMEM;
198         }
199
200         return 0;
201 }
202
203 /**
204  * Check for valid nodemap name
205  *
206  * \param       name            nodemap name
207  * \retval      true            valid
208  * \retval      false           invalid
209  */
210 static bool nodemap_name_is_valid(const char *name)
211 {
212         if (strlen(name) > LUSTRE_NODEMAP_NAME_LENGTH ||
213             strlen(name) == 0)
214                 return false;
215
216         for (; *name != '\0'; name++) {
217                 if (!isalnum(*name) && *name != '_')
218                         return false;
219         }
220
221         return true;
222 }
223
224 /**
225  * Nodemap lookup
226  *
227  * Look nodemap up in the active_config nodemap hash. Caller should hold the
228  * active_config_lock.
229  *
230  * \param       name            name of nodemap
231  * \retval      nodemap         pointer set to found nodemap
232  * \retval      -EINVAL         name is not valid
233  * \retval      -ENOENT         nodemap not found
234  */
235 struct lu_nodemap *nodemap_lookup(const char *name)
236 {
237         struct lu_nodemap *nodemap = NULL;
238
239         if (!nodemap_name_is_valid(name))
240                 return ERR_PTR(-EINVAL);
241
242         nodemap = cfs_hash_lookup(active_config->nmc_nodemap_hash, name);
243         if (nodemap == NULL)
244                 return ERR_PTR(-ENOENT);
245
246         return nodemap;
247 }
248
249 /**
250  * Classify the nid into the proper nodemap. Caller must hold active config and
251  * nm_range_tree_lock, and call nodemap_putref when done with nodemap.
252  *
253  * \param       nid                     nid to classify
254  * \retval      nodemap                 nodemap containing the nid
255  * \retval      default_nodemap         default nodemap
256  * \retval      -EINVAL                 LO nid given without other local nid
257  */
258 struct lu_nodemap *nodemap_classify_nid(lnet_nid_t nid)
259 {
260         struct lu_nid_range     *range;
261         struct lu_nodemap       *nodemap;
262         int rc;
263
264         ENTRY;
265
266         /* don't use 0@lo, use the first non-lo local NID instead */
267         if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND) {
268                 lnet_process_id_t id;
269                 int i = 0;
270
271                 do {
272                         rc = LNetGetId(i++, &id);
273                         if (rc < 0)
274                                 RETURN(ERR_PTR(-EINVAL));
275                 } while (LNET_NETTYP(LNET_NIDNET(id.nid)) == LOLND);
276
277                 nid = id.nid;
278                 CDEBUG(D_INFO, "found nid %s\n", libcfs_nid2str(nid));
279         }
280
281         range = range_search(&active_config->nmc_range_tree, nid);
282         if (range != NULL)
283                 nodemap = range->rn_nodemap;
284         else
285                 nodemap = active_config->nmc_default_nodemap;
286
287         LASSERT(nodemap != NULL);
288         nodemap_getref(nodemap);
289
290         RETURN(nodemap);
291 }
292
293 /**
294  * simple check for default nodemap
295  */
296 static bool is_default_nodemap(const struct lu_nodemap *nodemap)
297 {
298         return nodemap->nm_id == 0;
299 }
300
301 /**
302  * parse a nodemap range string into two nids
303  *
304  * \param       range_str               string to parse
305  * \param       range[2]                array of two nids
306  * \reyval      0 on success
307  */
308 int nodemap_parse_range(const char *range_str, lnet_nid_t range[2])
309 {
310         char    buf[LNET_NIDSTR_SIZE * 2 + 2];
311         char    *ptr = NULL;
312         char    *start_nidstr;
313         char    *end_nidstr;
314         int     rc = 0;
315
316         snprintf(buf, sizeof(buf), "%s", range_str);
317         ptr = buf;
318         start_nidstr = strsep(&ptr, ":");
319         end_nidstr = strsep(&ptr, ":");
320
321         if (start_nidstr == NULL || end_nidstr == NULL)
322                 GOTO(out, rc = -EINVAL);
323
324         range[0] = libcfs_str2nid(start_nidstr);
325         range[1] = libcfs_str2nid(end_nidstr);
326
327 out:
328         return rc;
329
330 }
331 EXPORT_SYMBOL(nodemap_parse_range);
332
333 /**
334  * parse a string containing an id map of form "client_id:filesystem_id"
335  * into an array of __u32 * for use in mapping functions
336  *
337  * \param       idmap_str               map string
338  * \param       idmap                   array[2] of __u32
339  *
340  * \retval      0 on success
341  * \retval      -EINVAL if idmap cannot be parsed
342  */
343 int nodemap_parse_idmap(char *idmap_str, __u32 idmap[2])
344 {
345         char                    *sep;
346         long unsigned int        idmap_buf;
347         int                      rc;
348
349         if (idmap_str == NULL)
350                 return -EINVAL;
351
352         sep = strchr(idmap_str, ':');
353         if (sep == NULL)
354                 return -EINVAL;
355         *sep = '\0';
356         sep++;
357
358         rc = kstrtoul(idmap_str, 10, &idmap_buf);
359         if (rc != 0)
360                 return -EINVAL;
361         idmap[0] = idmap_buf;
362
363         rc = kstrtoul(sep, 10, &idmap_buf);
364         if (rc != 0)
365                 return -EINVAL;
366         idmap[1] = idmap_buf;
367
368         return 0;
369 }
370 EXPORT_SYMBOL(nodemap_parse_idmap);
371
372 /**
373  * add a member to a nodemap
374  *
375  * \param       nid             nid to add to the members
376  * \param       exp             obd_export structure for the connection
377  *                              that is being added
378  * \retval      -EINVAL         export is NULL, or has invalid NID
379  * \retval      -EEXIST         export is already member of a nodemap
380  */
381 int nodemap_add_member(lnet_nid_t nid, struct obd_export *exp)
382 {
383         struct lu_nodemap *nodemap;
384         int rc = 0;
385         ENTRY;
386
387         mutex_lock(&active_config_lock);
388         down_read(&active_config->nmc_range_tree_lock);
389
390         nodemap = nodemap_classify_nid(nid);
391
392         if (IS_ERR(nodemap)) {
393                 CWARN("%s: error adding to nodemap, no valid NIDs found\n",
394                           exp->exp_obd->obd_name);
395                 rc = -EINVAL;
396         } else {
397                 rc = nm_member_add(nodemap, exp);
398         }
399
400         up_read(&active_config->nmc_range_tree_lock);
401         mutex_unlock(&active_config_lock);
402
403         if (!IS_ERR(nodemap))
404                 nodemap_putref(nodemap);
405
406         RETURN(rc);
407 }
408 EXPORT_SYMBOL(nodemap_add_member);
409
410 /**
411  * delete a member from a nodemap
412  *
413  * \param       exp             export to remove from a nodemap
414  */
415 void nodemap_del_member(struct obd_export *exp)
416 {
417         struct lu_nodemap *nodemap;
418
419         ENTRY;
420
421         /* using ac lock to prevent nodemap reclassification while deleting */
422         mutex_lock(&active_config_lock);
423
424         /* use of ted_nodemap is protected by active_config_lock. we take an
425          * extra reference to make sure nodemap isn't destroyed under
426          * active_config_lock
427          */
428         nodemap = exp->exp_target_data.ted_nodemap;
429         if (nodemap == NULL)
430                 goto out;
431         else
432                 nodemap_getref(nodemap);
433
434         mutex_lock(&nodemap->nm_member_list_lock);
435         nm_member_del(nodemap, exp);
436         mutex_unlock(&nodemap->nm_member_list_lock);
437
438 out:
439         mutex_unlock(&active_config_lock);
440
441         if (nodemap)
442                 nodemap_putref(nodemap);
443
444         EXIT;
445 }
446 EXPORT_SYMBOL(nodemap_del_member);
447
448 /**
449  * add an idmap to the proper nodemap trees
450  *
451  * \param       name            name of nodemap
452  * \param       id_type         NODEMAP_UID or NODEMAP_GID
453  * \param       map             array[2] __u32 containing the map values
454  *                              map[0] is client id
455  *                              map[1] is the filesystem id
456  *
457  * \retval      0 on success
458  */
459 int nodemap_add_idmap_helper(struct lu_nodemap *nodemap,
460                              enum nodemap_id_type id_type,
461                              const __u32 map[2])
462 {
463         struct lu_idmap         *idmap;
464         int                     rc = 0;
465
466         idmap = idmap_create(map[0], map[1]);
467         if (idmap == NULL)
468                 GOTO(out, rc = -ENOMEM);
469
470         write_lock(&nodemap->nm_idmap_lock);
471         idmap_insert(id_type, idmap, nodemap);
472         write_unlock(&nodemap->nm_idmap_lock);
473         nm_member_revoke_locks(nodemap);
474
475 out:
476         return rc;
477 }
478
479 int nodemap_add_idmap(const char *name, enum nodemap_id_type id_type,
480                       const __u32 map[2])
481 {
482         struct lu_nodemap       *nodemap = NULL;
483         int                      rc;
484
485         mutex_lock(&active_config_lock);
486         nodemap = nodemap_lookup(name);
487         if (IS_ERR(nodemap)) {
488                 mutex_unlock(&active_config_lock);
489                 GOTO(out, rc = PTR_ERR(nodemap));
490         }
491
492         if (is_default_nodemap(nodemap)) {
493                 rc = -EINVAL;
494         } else {
495                 rc = nodemap_add_idmap_helper(nodemap, id_type, map);
496                 if (rc == 0)
497                         rc = nodemap_idx_idmap_add(nodemap, id_type, map);
498         }
499         mutex_unlock(&active_config_lock);
500         nodemap_putref(nodemap);
501
502 out:
503         return rc;
504 }
505 EXPORT_SYMBOL(nodemap_add_idmap);
506
507 /**
508  * delete idmap from proper nodemap tree
509  *
510  * \param       name            name of nodemap
511  * \param       id_type         NODEMAP_UID or NODEMAP_GID
512  * \param       map             array[2] __u32 containing the mapA values
513  *                              map[0] is client id
514  *                              map[1] is the filesystem id
515  *
516  * \retval      0 on success
517  */
518 int nodemap_del_idmap(const char *name, enum nodemap_id_type id_type,
519                       const __u32 map[2])
520 {
521         struct lu_nodemap       *nodemap = NULL;
522         struct lu_idmap         *idmap = NULL;
523         int                     rc = 0;
524
525         mutex_lock(&active_config_lock);
526         nodemap = nodemap_lookup(name);
527         if (IS_ERR(nodemap)) {
528                 mutex_unlock(&active_config_lock);
529                 GOTO(out, rc = PTR_ERR(nodemap));
530         }
531
532         if (is_default_nodemap(nodemap))
533                 GOTO(out_putref, rc = -EINVAL);
534
535         write_lock(&nodemap->nm_idmap_lock);
536         idmap = idmap_search(nodemap, NODEMAP_CLIENT_TO_FS, id_type,
537                              map[0]);
538         if (idmap == NULL) {
539                 rc = -EINVAL;
540         } else {
541                 idmap_delete(id_type, idmap, nodemap);
542                 rc = nodemap_idx_idmap_del(nodemap, id_type, map);
543         }
544         write_unlock(&nodemap->nm_idmap_lock);
545
546 out_putref:
547         mutex_unlock(&active_config_lock);
548         if (rc == 0)
549                 nm_member_revoke_locks(nodemap);
550         nodemap_putref(nodemap);
551
552 out:
553         return rc;
554 }
555 EXPORT_SYMBOL(nodemap_del_idmap);
556
557 /**
558  * Get nodemap assigned to given export. Takes a reference on the nodemap.
559  *
560  * Note that this function may return either NULL, or an ERR_PTR()
561  * or a valid nodemap pointer.  All of the functions accessing the
562  * returned nodemap can check IS_ERR(nodemap) to see if an error is
563  * returned.  NULL is not considered an error, which is OK since this
564  * is a valid case if nodemap are not in use.  All nodemap handling
565  * functions must check for nodemap == NULL and do nothing, and the
566  * nodemap returned from this function should not be dereferenced.
567  *
568  * \param       export          export to get nodemap for
569  *
570  * \retval      pointer to nodemap on success
571  * \retval      NULL    nodemap subsystem disabled
572  * \retval      -EACCES export does not have nodemap assigned
573  */
574 struct lu_nodemap *nodemap_get_from_exp(struct obd_export *exp)
575 {
576         struct lu_nodemap *nodemap;
577
578         ENTRY;
579
580         if (!nodemap_active)
581                 RETURN(NULL);
582
583         spin_lock(&exp->exp_target_data.ted_nodemap_lock);
584         nodemap = exp->exp_target_data.ted_nodemap;
585         if (nodemap)
586                 nodemap_getref(nodemap);
587         spin_unlock(&exp->exp_target_data.ted_nodemap_lock);
588
589         if (!nodemap) {
590                 CDEBUG(D_INFO, "%s: nodemap null on export %s (at %s)\n",
591                        exp->exp_obd->obd_name,
592                        obd_uuid2str(&exp->exp_client_uuid),
593                        obd_export_nid2str(exp));
594                 RETURN(ERR_PTR(-EACCES));
595         }
596
597         RETURN(nodemap);
598 }
599 EXPORT_SYMBOL(nodemap_get_from_exp);
600
601 /**
602  * mapping function for nodemap idmaps
603  *
604  * \param       nodemap         lu_nodemap structure defining nodemap
605  * \param       node_type       NODEMAP_UID or NODEMAP_GID
606  * \param       tree_type       NODEMAP_CLIENT_TO_FS or
607  *                              NODEMAP_FS_TO_CLIENT
608  * \param       id              id to map
609  *
610  * \retval      mapped id according to the rules below.
611  *
612  * if the nodemap_active is false, just return the passed id without mapping
613  *
614  * if the id to be looked up is 0, check that root access is allowed and if it
615  * is, return 0. Otherwise, return the squash uid or gid.
616  *
617  * if the nodemap is configured to trusted the ids from the client system, just
618  * return the passwd id without mapping.
619  *
620  * if by this point, we haven't returned and the nodemap in question is the
621  * default nodemap, return the squash uid or gid.
622  *
623  * after these checks, search the proper tree for the mapping, and if found
624  * return the mapped value, otherwise return the squash uid or gid.
625  */
626 __u32 nodemap_map_id(struct lu_nodemap *nodemap,
627                      enum nodemap_id_type id_type,
628                      enum nodemap_tree_type tree_type, __u32 id)
629 {
630         struct lu_idmap         *idmap = NULL;
631         __u32                    found_id;
632
633         ENTRY;
634
635         if (!nodemap_active)
636                 goto out;
637
638         if (unlikely(nodemap == NULL))
639                 goto out;
640
641         if (id == 0) {
642                 if (nodemap->nmf_allow_root_access)
643                         goto out;
644                 else
645                         goto squash;
646         }
647
648         if (nodemap->nmf_trust_client_ids)
649                 goto out;
650
651         if (is_default_nodemap(nodemap))
652                 goto squash;
653
654         read_lock(&nodemap->nm_idmap_lock);
655         idmap = idmap_search(nodemap, tree_type, id_type, id);
656         if (idmap == NULL) {
657                 read_unlock(&nodemap->nm_idmap_lock);
658                 goto squash;
659         }
660
661         if (tree_type == NODEMAP_FS_TO_CLIENT)
662                 found_id = idmap->id_client;
663         else
664                 found_id = idmap->id_fs;
665         read_unlock(&nodemap->nm_idmap_lock);
666         RETURN(found_id);
667
668 squash:
669         if (id_type == NODEMAP_UID)
670                 RETURN(nodemap->nm_squash_uid);
671         else
672                 RETURN(nodemap->nm_squash_gid);
673 out:
674         RETURN(id);
675 }
676 EXPORT_SYMBOL(nodemap_map_id);
677
678 /**
679  * Map posix ACL entries according to the nodemap membership. Removes any
680  * squashed ACLs.
681  *
682  * \param       lu_nodemap      nodemap
683  * \param       buf             buffer containing xattr encoded ACLs
684  * \param       size            size of ACLs in bytes
685  * \param       tree_type       direction of mapping
686  * \retval      size            new size of ACLs in bytes
687  * \retval      -EINVAL         bad \a size param, see posix_acl_xattr_count()
688  */
689 ssize_t nodemap_map_acl(struct lu_nodemap *nodemap, void *buf, size_t size,
690                         enum nodemap_tree_type tree_type)
691 {
692         posix_acl_xattr_header  *header = buf;
693         posix_acl_xattr_entry   *entry = &header->a_entries[0];
694         posix_acl_xattr_entry   *new_entry = entry;
695         posix_acl_xattr_entry   *end;
696         int                      count;
697
698         if (!nodemap_active)
699                 return size;
700
701         if (unlikely(nodemap == NULL))
702                 return size;
703
704         count = posix_acl_xattr_count(size);
705         if (count < 0)
706                 return -EINVAL;
707         if (count == 0)
708                 return 0;
709
710         for (end = entry + count; entry != end; entry++) {
711                 __u16 tag = le16_to_cpu(entry->e_tag);
712                 __u32 id = le32_to_cpu(entry->e_id);
713
714                 switch (tag) {
715                 case ACL_USER:
716                         id = nodemap_map_id(nodemap, NODEMAP_UID,
717                                             tree_type, id);
718                         if (id == nodemap->nm_squash_uid)
719                                 continue;
720                         entry->e_id = cpu_to_le32(id);
721                         break;
722                 case ACL_GROUP:
723                         id = nodemap_map_id(nodemap, NODEMAP_GID,
724                                             tree_type, id);
725                         if (id == nodemap->nm_squash_gid)
726                                 continue;
727                         entry->e_id = cpu_to_le32(id);
728                         break;
729                 }
730
731                 /* if we skip an ACL, copy the following ones over it */
732                 if (new_entry != entry)
733                         *new_entry = *entry;
734
735                 new_entry++;
736         }
737
738         return (void *)new_entry - (void *)header;
739 }
740 EXPORT_SYMBOL(nodemap_map_acl);
741
742 /*
743  * Add nid range to given nodemap
744  *
745  * \param       config          nodemap config to work on
746  * \param       nodemap         nodemap to add range to
747  * \param       nid             nid range to add
748  * \param       range_id        should be 0 unless loading from disk
749  * \retval      0               success
750  * \retval      -ENOMEM
751  *
752  */
753 int nodemap_add_range_helper(struct nodemap_config *config,
754                              struct lu_nodemap *nodemap,
755                              const lnet_nid_t nid[2],
756                              unsigned int range_id)
757 {
758         struct lu_nid_range     *range;
759         int rc;
760
761         down_write(&config->nmc_range_tree_lock);
762         range = range_create(&config->nmc_range_tree, nid[0], nid[1],
763                              nodemap, range_id);
764         if (range == NULL) {
765                 up_write(&config->nmc_range_tree_lock);
766                 GOTO(out, rc = -ENOMEM);
767         }
768
769         rc = range_insert(&config->nmc_range_tree, range);
770         if (rc != 0) {
771                 CERROR("cannot insert nodemap range into '%s': rc = %d\n",
772                       nodemap->nm_name, rc);
773                 up_write(&config->nmc_range_tree_lock);
774                 list_del(&range->rn_list);
775                 range_destroy(range);
776                 GOTO(out, rc = -ENOMEM);
777         }
778
779         list_add(&range->rn_list, &nodemap->nm_ranges);
780
781         /* nodemaps have no members if they aren't on the active config */
782         if (config == active_config)
783                 nm_member_reclassify_nodemap(config->nmc_default_nodemap);
784
785         up_write(&config->nmc_range_tree_lock);
786
787         /* if range_id is non-zero, we are loading from disk */
788         if (range_id == 0)
789                 rc = nodemap_idx_range_add(range, nid);
790
791         if (config == active_config) {
792                 nm_member_revoke_locks(config->nmc_default_nodemap);
793                 nm_member_revoke_locks(nodemap);
794         }
795
796 out:
797         return rc;
798 }
799 int nodemap_add_range(const char *name, const lnet_nid_t nid[2])
800 {
801         struct lu_nodemap       *nodemap = NULL;
802         int                      rc;
803
804         mutex_lock(&active_config_lock);
805         nodemap = nodemap_lookup(name);
806         if (IS_ERR(nodemap)) {
807                 mutex_unlock(&active_config_lock);
808                 GOTO(out, rc = PTR_ERR(nodemap));
809         }
810
811         if (is_default_nodemap(nodemap))
812                 rc = -EINVAL;
813         else
814                 rc = nodemap_add_range_helper(active_config, nodemap, nid, 0);
815         mutex_unlock(&active_config_lock);
816         nodemap_putref(nodemap);
817 out:
818         return rc;
819 }
820 EXPORT_SYMBOL(nodemap_add_range);
821
822 /**
823  * delete a range
824  * \param       name            nodemap name
825  * \param       range_str       string containing range
826  * \retval      0 on success
827  *
828  * Delete range from global range tree, and remove it
829  * from the list in the associated nodemap.
830  */
831 int nodemap_del_range(const char *name, const lnet_nid_t nid[2])
832 {
833         struct lu_nodemap       *nodemap;
834         struct lu_nid_range     *range;
835         int                     rc = 0;
836
837         mutex_lock(&active_config_lock);
838         nodemap = nodemap_lookup(name);
839         if (IS_ERR(nodemap)) {
840                 mutex_unlock(&active_config_lock);
841                 GOTO(out, rc = PTR_ERR(nodemap));
842         }
843
844         if (is_default_nodemap(nodemap))
845                 GOTO(out_putref, rc = -EINVAL);
846
847         down_write(&active_config->nmc_range_tree_lock);
848         range = range_find(&active_config->nmc_range_tree, nid[0], nid[1]);
849         if (range == NULL) {
850                 up_write(&active_config->nmc_range_tree_lock);
851                 GOTO(out_putref, rc = -EINVAL);
852         }
853         rc = nodemap_idx_range_del(range);
854         range_delete(&active_config->nmc_range_tree, range);
855         nm_member_reclassify_nodemap(nodemap);
856         up_write(&active_config->nmc_range_tree_lock);
857
858         nm_member_revoke_locks(active_config->nmc_default_nodemap);
859         nm_member_revoke_locks(nodemap);
860
861 out_putref:
862         mutex_unlock(&active_config_lock);
863         nodemap_putref(nodemap);
864 out:
865         return rc;
866 }
867 EXPORT_SYMBOL(nodemap_del_range);
868
869 /**
870  * set fileset on nodemap
871  * \param       name            nodemap to set fileset on
872  * \param       fileset         string containing fileset
873  * \retval      0 on success
874  *
875  * set a fileset on the named nodemap
876  */
877 static int nodemap_set_fileset_helper(struct nodemap_config *config,
878                                       struct lu_nodemap *nodemap,
879                                       const char *fileset)
880 {
881         int rc = 0;
882
883         /* we allow fileset = "" which means clear fileset info */
884         if (fileset == NULL || (fileset[0] != 0 && fileset[0] != '/'))
885                 rc = -EINVAL;
886         else if (strlcpy(nodemap->nm_fileset, fileset,
887                          sizeof(nodemap->nm_fileset)) >=
888                  sizeof(nodemap->nm_fileset))
889                 rc = -ENAMETOOLONG;
890
891         return rc;
892 }
893
894 int nodemap_set_fileset(const char *name, const char *fileset)
895 {
896         struct lu_nodemap       *nodemap = NULL;
897         int                      rc = 0;
898
899         mutex_lock(&active_config_lock);
900         nodemap = nodemap_lookup(name);
901         if (IS_ERR(nodemap)) {
902                 mutex_unlock(&active_config_lock);
903                 GOTO(out, rc = PTR_ERR(nodemap));
904         }
905
906         if (is_default_nodemap(nodemap))
907                 rc = -EINVAL;
908         else
909                 rc = nodemap_set_fileset_helper(active_config, nodemap,
910                                                 fileset);
911         mutex_unlock(&active_config_lock);
912
913         nodemap_putref(nodemap);
914 out:
915         return rc;
916 }
917 EXPORT_SYMBOL(nodemap_set_fileset);
918
919 /**
920  * get fileset defined on nodemap
921  * \param       nodemap         nodemap to get fileset from
922  * \retval      fileset name, or NULL if not defined or not activated
923  *
924  * get the fileset defined on the nodemap
925  */
926 char *nodemap_get_fileset(const struct lu_nodemap *nodemap)
927 {
928         if (!nodemap_active || is_default_nodemap(nodemap))
929                 return NULL;
930         else
931                 return (char *)nodemap->nm_fileset;
932 }
933 EXPORT_SYMBOL(nodemap_get_fileset);
934
935 /**
936  * Nodemap constructor
937  *
938  * Creates an lu_nodemap structure and assigns sane default
939  * member values. If this is the default nodemap, the defaults
940  * are the most restictive in xterms of mapping behavior. Otherwise
941  * the default flags should be inherited from the default nodemap.
942  * The adds nodemap to nodemap_hash.
943  *
944  * Requires that the caller take the active_config_lock
945  *
946  * \param       name            name of nodemap
947  * \param       is_default      true if default nodemap
948  * \retval      nodemap         success
949  * \retval      -EINVAL         invalid nodemap name
950  * \retval      -EEXIST         nodemap already exists
951  * \retval      -ENOMEM         cannot allocate memory for nodemap
952  */
953 struct lu_nodemap *nodemap_create(const char *name,
954                                   struct nodemap_config *config,
955                                   bool is_default)
956 {
957         struct lu_nodemap       *nodemap = NULL;
958         struct lu_nodemap       *default_nodemap;
959         struct cfs_hash         *hash = config->nmc_nodemap_hash;
960         int                      rc = 0;
961
962         default_nodemap = config->nmc_default_nodemap;
963
964         if (!nodemap_name_is_valid(name))
965                 GOTO(out, rc = -EINVAL);
966
967         if (hash == NULL) {
968                 CERROR("Config nodemap hash is NULL, unable to add %s\n", name);
969                 GOTO(out, rc = -EINVAL);
970         }
971
972         OBD_ALLOC_PTR(nodemap);
973         if (nodemap == NULL) {
974                 CERROR("cannot allocate memory (%zu bytes)"
975                        "for nodemap '%s'\n", sizeof(*nodemap),
976                        name);
977                 GOTO(out, rc = -ENOMEM);
978         }
979
980         /*
981          * take an extra reference to prevent nodemap from being destroyed
982          * while it's being created.
983          */
984         atomic_set(&nodemap->nm_refcount, 2);
985         snprintf(nodemap->nm_name, sizeof(nodemap->nm_name), "%s", name);
986         rc = cfs_hash_add_unique(hash, name, &nodemap->nm_hash);
987         if (rc != 0) {
988                 OBD_FREE_PTR(nodemap);
989                 GOTO(out, rc = -EEXIST);
990         }
991
992         INIT_LIST_HEAD(&nodemap->nm_ranges);
993         INIT_LIST_HEAD(&nodemap->nm_list);
994         INIT_LIST_HEAD(&nodemap->nm_member_list);
995
996         mutex_init(&nodemap->nm_member_list_lock);
997         rwlock_init(&nodemap->nm_idmap_lock);
998         nodemap->nm_fs_to_client_uidmap = RB_ROOT;
999         nodemap->nm_client_to_fs_uidmap = RB_ROOT;
1000         nodemap->nm_fs_to_client_gidmap = RB_ROOT;
1001         nodemap->nm_client_to_fs_gidmap = RB_ROOT;
1002
1003         if (is_default) {
1004                 nodemap->nm_id = LUSTRE_NODEMAP_DEFAULT_ID;
1005                 config->nmc_default_nodemap = nodemap;
1006         } else {
1007                 config->nmc_nodemap_highest_id++;
1008                 nodemap->nm_id = config->nmc_nodemap_highest_id;
1009         }
1010
1011         if (is_default || default_nodemap == NULL) {
1012                 nodemap->nmf_trust_client_ids = 0;
1013                 nodemap->nmf_allow_root_access = 0;
1014                 nodemap->nmf_deny_unknown = 0;
1015
1016                 nodemap->nm_squash_uid = NODEMAP_NOBODY_UID;
1017                 nodemap->nm_squash_gid = NODEMAP_NOBODY_GID;
1018                 if (!is_default)
1019                         CWARN("adding nodemap '%s' to config without"
1020                               " default nodemap\n", nodemap->nm_name);
1021         } else {
1022                 nodemap->nmf_trust_client_ids =
1023                                 default_nodemap->nmf_trust_client_ids;
1024                 nodemap->nmf_allow_root_access =
1025                                 default_nodemap->nmf_allow_root_access;
1026                 nodemap->nmf_deny_unknown =
1027                                 default_nodemap->nmf_deny_unknown;
1028
1029                 nodemap->nm_squash_uid = default_nodemap->nm_squash_uid;
1030                 nodemap->nm_squash_gid = default_nodemap->nm_squash_gid;
1031                 nodemap->nm_fileset[0] = 0;
1032         }
1033
1034         return nodemap;
1035
1036 out:
1037         CERROR("cannot add nodemap: '%s': rc = %d\n", name, rc);
1038         return ERR_PTR(rc);
1039 }
1040
1041 /**
1042  * Set the nmf_deny_unknown flag to true or false.
1043  * \param       name            nodemap name
1044  * \param       deny_unknown    if true, squashed users will get EACCES
1045  * \retval      0 on success
1046  *
1047  */
1048 int nodemap_set_deny_unknown(const char *name, bool deny_unknown)
1049 {
1050         struct lu_nodemap       *nodemap = NULL;
1051         int                     rc = 0;
1052
1053         mutex_lock(&active_config_lock);
1054         nodemap = nodemap_lookup(name);
1055         mutex_unlock(&active_config_lock);
1056         if (IS_ERR(nodemap))
1057                 GOTO(out, rc = PTR_ERR(nodemap));
1058
1059         nodemap->nmf_deny_unknown = deny_unknown;
1060         rc = nodemap_idx_nodemap_update(nodemap);
1061
1062         nm_member_revoke_locks(nodemap);
1063         nodemap_putref(nodemap);
1064 out:
1065         return rc;
1066 }
1067 EXPORT_SYMBOL(nodemap_set_deny_unknown);
1068
1069 /**
1070  * Set the nmf_allow_root_access flag to true or false.
1071  * \param       name            nodemap name
1072  * \param       allow_root      if true, nodemap will not squash the root user
1073  * \retval      0 on success
1074  *
1075  */
1076 int nodemap_set_allow_root(const char *name, bool allow_root)
1077 {
1078         struct lu_nodemap       *nodemap = NULL;
1079         int                     rc = 0;
1080
1081         mutex_lock(&active_config_lock);
1082         nodemap = nodemap_lookup(name);
1083         mutex_unlock(&active_config_lock);
1084         if (IS_ERR(nodemap))
1085                 GOTO(out, rc = PTR_ERR(nodemap));
1086
1087         nodemap->nmf_allow_root_access = allow_root;
1088         rc = nodemap_idx_nodemap_update(nodemap);
1089
1090         nm_member_revoke_locks(nodemap);
1091         nodemap_putref(nodemap);
1092 out:
1093         return rc;
1094 }
1095 EXPORT_SYMBOL(nodemap_set_allow_root);
1096
1097 /**
1098  * Set the nmf_trust_client_ids flag to true or false.
1099  *
1100  * \param       name                    nodemap name
1101  * \param       trust_client_ids        if true, nodemap will not map its IDs
1102  * \retval      0 on success
1103  *
1104  */
1105 int nodemap_set_trust_client_ids(const char *name, bool trust_client_ids)
1106 {
1107         struct lu_nodemap       *nodemap = NULL;
1108         int                     rc = 0;
1109
1110         mutex_lock(&active_config_lock);
1111         nodemap = nodemap_lookup(name);
1112         mutex_unlock(&active_config_lock);
1113         if (IS_ERR(nodemap))
1114                 GOTO(out, rc = PTR_ERR(nodemap));
1115
1116         nodemap->nmf_trust_client_ids = trust_client_ids;
1117         rc = nodemap_idx_nodemap_update(nodemap);
1118
1119         nm_member_revoke_locks(nodemap);
1120         nodemap_putref(nodemap);
1121 out:
1122         return rc;
1123 }
1124 EXPORT_SYMBOL(nodemap_set_trust_client_ids);
1125
1126 /**
1127  * Update the squash_uid for a nodemap.
1128  *
1129  * \param       name            nodemap name
1130  * \param       uid             the new uid to squash unknown users to
1131  * \retval      0 on success
1132  *
1133  * Update the squash_uid for a nodemap. The squash_uid is the uid
1134  * that the all client uids are mapped to if nodemap is active,
1135  * the trust_client_ids flag is not set, and the uid is not in
1136  * the idmap tree.
1137  */
1138 int nodemap_set_squash_uid(const char *name, uid_t uid)
1139 {
1140         struct lu_nodemap       *nodemap = NULL;
1141         int                     rc = 0;
1142
1143         mutex_lock(&active_config_lock);
1144         nodemap = nodemap_lookup(name);
1145         mutex_unlock(&active_config_lock);
1146         if (IS_ERR(nodemap))
1147                 GOTO(out, rc = PTR_ERR(nodemap));
1148
1149         nodemap->nm_squash_uid = uid;
1150         rc = nodemap_idx_nodemap_update(nodemap);
1151
1152         nm_member_revoke_locks(nodemap);
1153         nodemap_putref(nodemap);
1154 out:
1155         return rc;
1156 }
1157 EXPORT_SYMBOL(nodemap_set_squash_uid);
1158
1159 /**
1160  * Update the squash_gid for a nodemap.
1161  *
1162  * \param       name            nodemap name
1163  * \param       gid             the new gid to squash unknown gids to
1164  * \retval      0 on success
1165  *
1166  * Update the squash_gid for a nodemap. The squash_uid is the gid
1167  * that the all client gids are mapped to if nodemap is active,
1168  * the trust_client_ids flag is not set, and the gid is not in
1169  * the idmap tree.
1170  */
1171 int nodemap_set_squash_gid(const char *name, gid_t gid)
1172 {
1173         struct lu_nodemap       *nodemap = NULL;
1174         int                     rc = 0;
1175
1176         mutex_lock(&active_config_lock);
1177         nodemap = nodemap_lookup(name);
1178         mutex_unlock(&active_config_lock);
1179         if (IS_ERR(nodemap))
1180                 GOTO(out, rc = PTR_ERR(nodemap));
1181
1182         nodemap->nm_squash_gid = gid;
1183         rc = nodemap_idx_nodemap_update(nodemap);
1184
1185         nm_member_revoke_locks(nodemap);
1186         nodemap_putref(nodemap);
1187 out:
1188         return rc;
1189 }
1190 EXPORT_SYMBOL(nodemap_set_squash_gid);
1191
1192 /**
1193  * Returns true if this nodemap has root user access. Always returns true if
1194  * nodemaps are not active.
1195  *
1196  * \param       nodemap         nodemap to check access for
1197  */
1198 bool nodemap_can_setquota(const struct lu_nodemap *nodemap)
1199 {
1200         return !nodemap_active || (nodemap && nodemap->nmf_allow_root_access);
1201 }
1202 EXPORT_SYMBOL(nodemap_can_setquota);
1203
1204 /**
1205  * Add a nodemap
1206  *
1207  * \param       name            name of nodemap
1208  * \retval      0               success
1209  * \retval      -EINVAL         invalid nodemap name
1210  * \retval      -EEXIST         nodemap already exists
1211  * \retval      -ENOMEM         cannot allocate memory for nodemap
1212  */
1213 int nodemap_add(const char *nodemap_name)
1214 {
1215         struct lu_nodemap *nodemap;
1216         int rc;
1217
1218         mutex_lock(&active_config_lock);
1219         nodemap = nodemap_create(nodemap_name, active_config, 0);
1220         if (IS_ERR(nodemap)) {
1221                 mutex_unlock(&active_config_lock);
1222                 return PTR_ERR(nodemap);
1223         }
1224
1225         rc = nodemap_idx_nodemap_add(nodemap);
1226         if (rc == 0)
1227                 rc = lprocfs_nodemap_register(nodemap, 0);
1228
1229         mutex_unlock(&active_config_lock);
1230         nodemap_putref(nodemap);
1231
1232         return rc;
1233 }
1234 EXPORT_SYMBOL(nodemap_add);
1235
1236 /**
1237  * Delete a nodemap
1238  *
1239  * \param       name            name of nodemmap
1240  * \retval      0               success
1241  * \retval      -EINVAL         invalid input
1242  * \retval      -ENOENT         no existing nodemap
1243  */
1244 int nodemap_del(const char *nodemap_name)
1245 {
1246         struct lu_nodemap       *nodemap;
1247         struct lu_nid_range     *range;
1248         struct lu_nid_range     *range_temp;
1249         int                      rc = 0;
1250         int                      rc2 = 0;
1251
1252         if (strcmp(nodemap_name, DEFAULT_NODEMAP) == 0)
1253                 RETURN(-EINVAL);
1254
1255         mutex_lock(&active_config_lock);
1256         nodemap = cfs_hash_del_key(active_config->nmc_nodemap_hash,
1257                                    nodemap_name);
1258         if (nodemap == NULL) {
1259                 mutex_unlock(&active_config_lock);
1260                 GOTO(out, rc = -ENOENT);
1261         }
1262
1263         /* erase nodemap from active ranges to prevent client assignment */
1264         down_write(&active_config->nmc_range_tree_lock);
1265         list_for_each_entry_safe(range, range_temp, &nodemap->nm_ranges,
1266                                  rn_list) {
1267                 rc2 = nodemap_idx_range_del(range);
1268                 if (rc2 < 0)
1269                         rc = rc2;
1270
1271                 range_delete(&active_config->nmc_range_tree, range);
1272         }
1273         up_write(&active_config->nmc_range_tree_lock);
1274
1275         rc2 = nodemap_idx_nodemap_del(nodemap);
1276         if (rc2 < 0)
1277                 rc = rc2;
1278
1279         /*
1280          * remove procfs here in case nodemap_create called with same name
1281          * before nodemap_destroy is run.
1282          */
1283         lprocfs_nodemap_remove(nodemap->nm_pde_data);
1284         nodemap->nm_pde_data = NULL;
1285
1286         /* reclassify all member exports from nodemap, so they put their refs */
1287         down_read(&active_config->nmc_range_tree_lock);
1288         nm_member_reclassify_nodemap(nodemap);
1289         up_read(&active_config->nmc_range_tree_lock);
1290
1291         if (!list_empty(&nodemap->nm_member_list))
1292                 CWARN("nodemap_del failed to reclassify all members\n");
1293
1294         mutex_unlock(&active_config_lock);
1295
1296         nodemap_putref(nodemap);
1297
1298 out:
1299         return rc;
1300 }
1301 EXPORT_SYMBOL(nodemap_del);
1302
1303 /**
1304  * activate nodemap functions
1305  *
1306  * \param       value           1 for on, 0 for off
1307  */
1308 void nodemap_activate(const bool value)
1309 {
1310         mutex_lock(&active_config_lock);
1311         active_config->nmc_nodemap_is_active = value;
1312
1313         /* copy active value to global to avoid locking in map functions */
1314         nodemap_active = value;
1315         nodemap_idx_nodemap_activate(value);
1316         mutex_unlock(&active_config_lock);
1317         nm_member_revoke_all();
1318 }
1319 EXPORT_SYMBOL(nodemap_activate);
1320
1321 /**
1322  * Helper iterator to convert nodemap hash to list.
1323  *
1324  * \param       hs                      hash structure
1325  * \param       bd                      bucket descriptor
1326  * \param       hnode                   hash node
1327  * \param       nodemap_list_head       list head for list of nodemaps in hash
1328  */
1329 static int nodemap_cleanup_iter_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1330                                    struct hlist_node *hnode,
1331                                    void *nodemap_list_head)
1332 {
1333         struct lu_nodemap *nodemap;
1334
1335         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
1336         list_add(&nodemap->nm_list, nodemap_list_head);
1337
1338         cfs_hash_bd_del_locked(hs, bd, hnode);
1339
1340         return 0;
1341 }
1342
1343 struct nodemap_config *nodemap_config_alloc(void)
1344 {
1345         struct nodemap_config *config;
1346         int rc = 0;
1347
1348         OBD_ALLOC_PTR(config);
1349         if (config == NULL)
1350                 return ERR_PTR(-ENOMEM);
1351
1352         rc = nodemap_init_hash(config);
1353         if (rc != 0) {
1354                 OBD_FREE_PTR(config);
1355                 return ERR_PTR(rc);
1356         }
1357
1358         init_rwsem(&config->nmc_range_tree_lock);
1359
1360         return config;
1361 }
1362 EXPORT_SYMBOL(nodemap_config_alloc);
1363
1364 /**
1365  * Walk the nodemap_hash and remove all nodemaps.
1366  */
1367 void nodemap_config_dealloc(struct nodemap_config *config)
1368 {
1369         struct lu_nodemap       *nodemap = NULL;
1370         struct lu_nodemap       *nodemap_temp;
1371         struct lu_nid_range     *range;
1372         struct lu_nid_range     *range_temp;
1373         LIST_HEAD(nodemap_list_head);
1374
1375         cfs_hash_for_each_safe(config->nmc_nodemap_hash,
1376                                nodemap_cleanup_iter_cb, &nodemap_list_head);
1377         cfs_hash_putref(config->nmc_nodemap_hash);
1378
1379         /* Because nodemap_destroy might sleep, we can't destroy them
1380          * in cfs_hash_for_each, so we build a list there and destroy here
1381          */
1382         list_for_each_entry_safe(nodemap, nodemap_temp, &nodemap_list_head,
1383                                  nm_list) {
1384                 mutex_lock(&active_config_lock);
1385                 down_write(&config->nmc_range_tree_lock);
1386
1387                 /* move members to new config, requires ac lock */
1388                 nm_member_reclassify_nodemap(nodemap);
1389                 list_for_each_entry_safe(range, range_temp, &nodemap->nm_ranges,
1390                                          rn_list)
1391                         range_delete(&config->nmc_range_tree, range);
1392                 up_write(&config->nmc_range_tree_lock);
1393                 mutex_unlock(&active_config_lock);
1394
1395                 /* putref must be outside of ac lock if nm could be destroyed */
1396                 nodemap_putref(nodemap);
1397         }
1398         OBD_FREE_PTR(config);
1399 }
1400 EXPORT_SYMBOL(nodemap_config_dealloc);
1401
1402 /*
1403  * callback for cfs_hash_for_each_safe used to convert a nodemap hash to a
1404  * nodemap list, generally for locking purposes as a hash cb can't sleep.
1405  */
1406 int nm_hash_list_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1407                     struct hlist_node *hnode,
1408                     void *nodemap_list_head)
1409 {
1410         struct lu_nodemap *nodemap;
1411
1412         nodemap = hlist_entry(hnode, struct lu_nodemap, nm_hash);
1413         list_add(&nodemap->nm_list, nodemap_list_head);
1414         return 0;
1415 }
1416
1417 void nodemap_config_set_active(struct nodemap_config *config)
1418 {
1419         struct nodemap_config   *old_config = active_config;
1420         struct lu_nodemap       *nodemap;
1421         struct lu_nodemap       *tmp;
1422         bool revoke_locks;
1423         LIST_HEAD(nodemap_list_head);
1424
1425         ENTRY;
1426
1427         LASSERT(active_config != config);
1428         LASSERT(config->nmc_default_nodemap);
1429
1430         mutex_lock(&active_config_lock);
1431
1432         /* move proc entries from already existing nms, create for new nms */
1433         cfs_hash_for_each_safe(config->nmc_nodemap_hash,
1434                                nm_hash_list_cb, &nodemap_list_head);
1435         list_for_each_entry_safe(nodemap, tmp, &nodemap_list_head, nm_list) {
1436                 struct lu_nodemap *old_nm = NULL;
1437
1438                 if (active_config != NULL)
1439                         old_nm = cfs_hash_lookup(
1440                                         active_config->nmc_nodemap_hash,
1441                                         nodemap->nm_name);
1442                 if (old_nm != NULL) {
1443                         nodemap->nm_pde_data = old_nm->nm_pde_data;
1444                         old_nm->nm_pde_data = NULL;
1445                         nodemap_putref(old_nm);
1446                 } else {
1447                         bool is_def = (nodemap == config->nmc_default_nodemap);
1448
1449                         lprocfs_nodemap_register(nodemap, is_def);
1450                 }
1451         }
1452
1453         /*
1454          * We only need to revoke locks if old nodemap was active, and new
1455          * config is now nodemap inactive. nodemap_config_dealloc will
1456          * reclassify exports, triggering a lock revoke if and only if new
1457          * nodemap is active.
1458          */
1459         revoke_locks = !config->nmc_nodemap_is_active && nodemap_active;
1460
1461         /* if new config is inactive, deactivate live config before switching */
1462         if (!config->nmc_nodemap_is_active)
1463                 nodemap_active = false;
1464         active_config = config;
1465         if (config->nmc_nodemap_is_active)
1466                 nodemap_active = true;
1467
1468         mutex_unlock(&active_config_lock);
1469
1470         if (old_config != NULL)
1471                 nodemap_config_dealloc(old_config);
1472
1473         if (revoke_locks)
1474                 nm_member_revoke_all();
1475
1476         EXIT;
1477 }
1478
1479 /**
1480  * Cleanup nodemap module on exit
1481  */
1482 void nodemap_mod_exit(void)
1483 {
1484         nodemap_config_dealloc(active_config);
1485         nodemap_procfs_exit();
1486 }
1487
1488 /**
1489  * Initialize the nodemap module
1490  */
1491 int nodemap_mod_init(void)
1492 {
1493         struct nodemap_config   *new_config;
1494         struct lu_nodemap       *nodemap;
1495         int                      rc = 0;
1496
1497         rc = nodemap_procfs_init();
1498         if (rc != 0)
1499                 return rc;
1500
1501         new_config = nodemap_config_alloc();
1502         if (IS_ERR(new_config)) {
1503                 nodemap_procfs_exit();
1504                 GOTO(out, rc = PTR_ERR(new_config));
1505         }
1506
1507         nodemap = nodemap_create(DEFAULT_NODEMAP, new_config, 1);
1508         if (IS_ERR(nodemap)) {
1509                 nodemap_config_dealloc(new_config);
1510                 nodemap_procfs_exit();
1511                 GOTO(out, rc = PTR_ERR(nodemap));
1512         }
1513
1514         nodemap_config_set_active(new_config);
1515         nodemap_putref(nodemap);
1516
1517 out:
1518         return rc;
1519 }
1520
1521 /**
1522  * Revoke locks for all nodemaps.
1523  */
1524 void nm_member_revoke_all(void)
1525 {
1526         struct lu_nodemap *nodemap;
1527         struct lu_nodemap *tmp;
1528         LIST_HEAD(nodemap_list_head);
1529
1530         mutex_lock(&active_config_lock);
1531         cfs_hash_for_each_safe(active_config->nmc_nodemap_hash,
1532                                nm_hash_list_cb, &nodemap_list_head);
1533
1534         /* revoke_locks sleeps, so can't call in cfs hash cb */
1535         list_for_each_entry_safe(nodemap, tmp, &nodemap_list_head, nm_list)
1536                 nm_member_revoke_locks_always(nodemap);
1537         mutex_unlock(&active_config_lock);
1538 }
1539
1540 /**
1541  * Returns the nodemap classification for a given nid into an ioctl buffer.
1542  * Useful for testing the nodemap configuration to make sure it is working as
1543  * expected.
1544  *
1545  * \param       nid             nid to classify
1546  * \param[out]  name_buf        buffer to write the nodemap name to
1547  * \param       name_len        length of buffer
1548  */
1549 void nodemap_test_nid(lnet_nid_t nid, char *name_buf, size_t name_len)
1550 {
1551         struct lu_nodemap       *nodemap;
1552
1553         mutex_lock(&active_config_lock);
1554         down_read(&active_config->nmc_range_tree_lock);
1555         nodemap = nodemap_classify_nid(nid);
1556         up_read(&active_config->nmc_range_tree_lock);
1557         mutex_unlock(&active_config_lock);
1558
1559         if (IS_ERR(nodemap))
1560                 return;
1561
1562         strncpy(name_buf, nodemap->nm_name, name_len);
1563         if (name_len > 0)
1564                 name_buf[name_len - 1] = '\0';
1565
1566         nodemap_putref(nodemap);
1567 }
1568 EXPORT_SYMBOL(nodemap_test_nid);
1569
1570 /**
1571  * Passes back the id mapping for a given nid/id pair. Useful for testing the
1572  * nodemap configuration to make sure it is working as expected.
1573  *
1574  * \param       nid             nid to classify
1575  * \param       idtype          uid or gid
1576  * \param       client_id       id to map to fs
1577  * \param       fs_id_buf       pointer to save mapped fs_id to
1578  *
1579  * \retval      0       success
1580  * \retval      -EINVAL invalid NID
1581  */
1582 int nodemap_test_id(lnet_nid_t nid, enum nodemap_id_type idtype,
1583                     __u32 client_id, __u32 *fs_id)
1584 {
1585         struct lu_nodemap       *nodemap;
1586
1587         mutex_lock(&active_config_lock);
1588         down_read(&active_config->nmc_range_tree_lock);
1589         nodemap = nodemap_classify_nid(nid);
1590         up_read(&active_config->nmc_range_tree_lock);
1591         mutex_unlock(&active_config_lock);
1592
1593         if (IS_ERR(nodemap))
1594                 return PTR_ERR(nodemap);
1595
1596         *fs_id = nodemap_map_id(nodemap, idtype, NODEMAP_CLIENT_TO_FS,
1597                                client_id);
1598         nodemap_putref(nodemap);
1599
1600         return 0;
1601 }
1602 EXPORT_SYMBOL(nodemap_test_id);