1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * lustre/obdclass/capa.c
5 * Lustre Capability Cache Management
7 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
8 * Author: Lai Siyao<lsy@clusterfs.com>
10 * This file is part of Lustre, http://www.lustre.org.
12 * Lustre is free software; you can redistribute it and/or
13 * modify it under the terms of version 2 of the GNU General Public
14 * License as published by the Free Software Foundation.
16 * Lustre is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with Lustre; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 # define EXPORT_SYMTAB
29 #define DEBUG_SUBSYSTEM S_SEC
32 #include <linux/version.h>
34 #include <asm/unistd.h>
35 #include <linux/slab.h>
36 #include <linux/module.h>
37 #include <linux/init.h>
39 #include <linux/obd_class.h>
40 #include <linux/lustre_debug.h>
41 #include <linux/lustre_idl.h>
42 #include <linux/lustre_sec.h>
44 #include <liblustre.h>
47 #include <libcfs/list.h>
48 #include <linux/lustre_sec.h>
50 kmem_cache_t *capa_cachep = NULL;
52 /* capa_lock protect capa hash, list and content. */
53 spinlock_t capa_lock = SPIN_LOCK_UNLOCKED;
54 struct hlist_head *capa_hash;
55 struct list_head capa_list[3];
56 static int capa_count[3] = { 0 };
58 /* TODO: mdc and llite all need this, so define it here.
59 * in the future it will be moved to ll_sb_info to support multi-
61 struct timer_list ll_capa_timer;
63 EXPORT_SYMBOL(capa_lock);
64 EXPORT_SYMBOL(capa_hash);
65 EXPORT_SYMBOL(capa_list);
66 EXPORT_SYMBOL(ll_capa_timer);
68 static inline int const
69 capa_hashfn(unsigned int uid, int capa_op, __u64 mdsid, unsigned long ino)
71 return (ino ^ uid) * (unsigned long)capa_op * (unsigned long)mdsid %
75 int capa_op(int flags)
77 if (flags & (FMODE_WRITE|MDS_OPEN_TRUNC))
79 else if (flags & FMODE_READ)
82 LBUG(); /* should be either MAY_READ or MAY_WRITE */
86 static struct obd_capa *
87 find_capa(struct hlist_head *head, uid_t uid, int capa_op, __u64 mdsid,
88 unsigned long ino, int type)
90 struct hlist_node *pos;
91 struct obd_capa *ocapa;
94 CDEBUG(D_CACHE, "find_capa uid %u op %u mdsid "LPU64" ino %lu "
95 "type %d\n", uid, capa_op, mdsid, ino, type);
97 hlist_for_each_entry(ocapa, pos, head, c_hash) {
98 if (ocapa->c_capa.lc_uid != uid)
100 if (ocapa->c_capa.lc_op != capa_op)
102 if (ocapa->c_capa.lc_mdsid != mdsid)
104 if (ocapa->c_capa.lc_ino != ino)
106 if (ocapa->c_type != type)
114 inline void __capa_get(struct obd_capa *ocapa)
116 atomic_inc(&ocapa->c_refc);
119 static struct obd_capa *
120 find_capa_locked(struct hlist_head *head, uid_t uid, int capa_op, __u64 mdsid,
121 unsigned long ino, int type)
123 struct obd_capa *ocapa;
126 spin_lock(&capa_lock);
127 ocapa = find_capa(head, uid, capa_op, mdsid, ino, type);
130 spin_unlock(&capa_lock);
135 static struct obd_capa *alloc_capa(void)
137 struct obd_capa *ocapa;
140 OBD_SLAB_ALLOC(ocapa, capa_cachep, SLAB_NOFS, sizeof(*ocapa));
142 INIT_HLIST_NODE(&ocapa->c_hash);
143 INIT_LIST_HEAD(&ocapa->c_list);
149 static void destroy_capa(struct obd_capa *ocapa)
151 OBD_SLAB_FREE(ocapa, capa_cachep, sizeof(*ocapa));
154 int capa_cache_init(void)
158 OBD_ALLOC(capa_hash, PAGE_SIZE);
162 nr_hash = PAGE_SIZE / sizeof(struct hlist_head);
163 LASSERT(nr_hash > NR_CAPAHASH);
165 for (i = 0; i < NR_CAPAHASH; i++)
166 INIT_HLIST_HEAD(capa_hash + i);
168 for (i = 0; i < 3; i++)
169 INIT_LIST_HEAD(&capa_list[i]);
174 void capa_cache_cleanup(void)
176 struct obd_capa *ocapa;
177 struct hlist_node *pos, *n;
179 hlist_for_each_entry_safe(ocapa, pos, n, capa_hash, c_hash) {
180 hlist_del(&ocapa->c_hash);
181 list_del(&ocapa->c_list);
182 OBD_FREE(ocapa, sizeof(*ocapa));
187 static inline void list_add_capa(struct obd_capa *ocapa, struct list_head *head)
189 struct obd_capa *tmp;
191 /* XXX: capa is sorted in client, this could be optimized */
192 if (ocapa->c_type == CLIENT_CAPA) {
193 list_for_each_entry_reverse(tmp, head, c_list) {
194 if (ocapa->c_capa.lc_expiry > tmp->c_capa.lc_expiry) {
195 list_add(&ocapa->c_list, &tmp->c_list);
201 list_add_tail(&ocapa->c_list, head);
204 #define DEBUG_CAPA(level, ocapa, fmt, args...) \
206 CDEBUG(level, fmt " capa@%p uid %u op %u ino "LPU64" mdsid %d keyid %d " \
207 "expiry "LPU64" flags %u type %d\n", \
208 ##args, ocapa, ocapa->c_capa.lc_uid, ocapa->c_capa.lc_op, \
209 ocapa->c_capa.lc_ino, ocapa->c_capa.lc_mdsid, ocapa->c_capa.lc_keyid, \
210 ocapa->c_capa.lc_expiry, ocapa->c_capa.lc_flags, ocapa->c_type); \
213 static struct obd_capa *
214 get_new_capa_locked(struct hlist_head *head, uid_t uid, int capa_op,__u64 mdsid,
215 unsigned long ino, int type, struct lustre_capa *capa,
216 struct inode *inode, struct lustre_handle *handle)
218 struct obd_capa *ocapa, *old;
221 ocapa = alloc_capa();
225 spin_lock(&capa_lock);
226 old = find_capa(head, uid, capa_op, mdsid, ino, type);
228 memcpy(&ocapa->c_capa, capa, sizeof(*capa));
229 ocapa->c_type = type;
230 if (type == CLIENT_CAPA) {
235 ocapa->c_inode = inode;
236 memcpy(&ocapa->c_handle, handle, sizeof(*handle));
238 list_add_capa(ocapa, &capa_list[type]);
239 hlist_add_head(&ocapa->c_hash, capa_hash);
241 DEBUG_CAPA(D_CACHE, ocapa, "get_new_capa_locked");
243 if (type != CLIENT_CAPA && capa_count[type] > CAPA_CACHE_SIZE) {
244 struct list_head *node = capa_list[type].next;
245 struct obd_capa *tcapa;
248 /* free 12 unused capa from head */
249 while (node->next != &capa_list[type] && count < 12) {
250 tcapa = list_entry(node, struct obd_capa, c_list);
252 if (atomic_read(&tcapa->c_refc) > 0)
254 list_del(&tcapa->c_list);
260 spin_unlock(&capa_lock);
265 spin_unlock(&capa_lock);
271 static struct obd_capa *
272 capa_get_locked(uid_t uid, int capa_op,__u64 mdsid, unsigned long ino,
273 int type, struct lustre_capa *capa, struct inode *inode,
274 struct lustre_handle *handle)
276 struct hlist_head *head = capa_hash +
277 capa_hashfn(uid, capa_op, mdsid, ino);
278 struct obd_capa *ocapa;
281 ocapa = find_capa_locked(head, uid, capa_op, mdsid, ino, type);
286 ocapa = get_new_capa_locked(head, uid, capa_op, mdsid, ino,
287 type, capa, inode, handle);
292 capa_get(uid_t uid, int capa_op, __u64 mdsid, unsigned long ino, int type,
293 struct lustre_capa *capa, struct inode *inode,
294 struct lustre_handle *handle)
296 return capa_get_locked(uid, capa_op, mdsid, ino, type, capa, inode,
300 static void __capa_put(struct obd_capa *ocapa, int type)
302 hlist_del_init(&ocapa->c_hash);
303 list_del_init(&ocapa->c_list);
307 void capa_put(struct obd_capa *ocapa, int type)
312 if (atomic_dec_and_lock(&ocapa->c_refc, &capa_lock)) {
313 if (type == CLIENT_CAPA) {
315 iput(ocapa->c_inode);
317 __capa_put(ocapa, type);
320 spin_unlock(&capa_lock);
327 static inline void __update_capa(struct obd_capa *ocapa, struct lustre_capa *capa)
329 memcpy(&ocapa->c_capa, capa, sizeof(*capa));
332 static int update_capa_locked(struct lustre_capa *capa, int type)
334 uid_t uid = capa->lc_uid;
335 int capa_op = capa->lc_op;
336 __u64 mdsid = capa->lc_mdsid;
337 unsigned long ino = capa->lc_ino;
338 struct hlist_head *head = capa_hash +
339 capa_hashfn(uid, capa_op, mdsid, ino);
340 struct obd_capa *ocapa;
343 spin_lock(&capa_lock);
344 ocapa = find_capa(head, uid, capa_op, mdsid, ino, type);
346 __update_capa(ocapa, capa);
347 spin_unlock(&capa_lock);
349 if (ocapa == NULL && type == MDS_CAPA)
350 ocapa = get_new_capa_locked(head, uid, capa_op, mdsid, ino, type,
353 RETURN(ocapa ? 0 : -ENOENT);
356 int capa_renew(struct lustre_capa *capa, int type)
358 return update_capa_locked(capa, type);
361 void capa_hmac(struct crypto_tfm *tfm, __u8 *key, struct lustre_capa *capa)
363 int keylen = CAPA_KEY_LEN;
364 struct scatterlist sl = {
365 .page = virt_to_page(capa),
366 .offset = (unsigned long)(capa) % PAGE_SIZE,
367 .length = sizeof(struct lustre_capa_data),
372 crypto_hmac(tfm, key, &keylen, &sl, 1, capa->lc_hmac);
376 void capa_dup(void *dst, struct obd_capa *ocapa)
378 spin_lock(&capa_lock);
379 memcpy(dst, &ocapa->c_capa, sizeof(ocapa->c_capa));
380 spin_unlock(&capa_lock);
383 void capa_dup2(void *dst, struct lustre_capa *capa)
385 spin_lock(&capa_lock);
386 memcpy(dst, capa, sizeof(*capa));
387 spin_unlock(&capa_lock);
390 int capa_expired(struct lustre_capa *capa)
394 do_gettimeofday(&tv);
395 return (capa->lc_expiry < tv.tv_sec) ? 1 : 0;
398 int __capa_is_to_expire(struct obd_capa *ocapa)
401 int pre_expiry = capa_pre_expiry(&ocapa->c_capa);
403 do_gettimeofday(&tv);
404 return (ocapa->c_capa.lc_expiry - pre_expiry < tv.tv_sec)? 1 : 0;
407 int capa_is_to_expire(struct obd_capa *ocapa)
411 spin_lock(&capa_lock);
412 rc = __capa_is_to_expire(ocapa);
413 spin_unlock(&capa_lock);
418 EXPORT_SYMBOL(capa_op);
419 EXPORT_SYMBOL(capa_get);
420 EXPORT_SYMBOL(capa_put);
421 EXPORT_SYMBOL(capa_renew);
422 EXPORT_SYMBOL(__capa_get);
423 EXPORT_SYMBOL(capa_hmac);
424 EXPORT_SYMBOL(capa_dup);
425 EXPORT_SYMBOL(capa_dup2);
426 EXPORT_SYMBOL(capa_expired);
427 EXPORT_SYMBOL(__capa_is_to_expire);
428 EXPORT_SYMBOL(capa_is_to_expire);