xref: /freebsd/sys/kern/kern_osd.c (revision aa90aec2703c8c85e4109f6714bea675b29fcf75)
11ba4a712SPawel Jakub Dawidek /*-
21ba4a712SPawel Jakub Dawidek  * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
31ba4a712SPawel Jakub Dawidek  * All rights reserved.
41ba4a712SPawel Jakub Dawidek  *
51ba4a712SPawel Jakub Dawidek  * Redistribution and use in source and binary forms, with or without
61ba4a712SPawel Jakub Dawidek  * modification, are permitted provided that the following conditions
71ba4a712SPawel Jakub Dawidek  * are met:
81ba4a712SPawel Jakub Dawidek  * 1. Redistributions of source code must retain the above copyright
91ba4a712SPawel Jakub Dawidek  *    notice, this list of conditions and the following disclaimer.
101ba4a712SPawel Jakub Dawidek  * 2. Redistributions in binary form must reproduce the above copyright
111ba4a712SPawel Jakub Dawidek  *    notice, this list of conditions and the following disclaimer in the
121ba4a712SPawel Jakub Dawidek  *    documentation and/or other materials provided with the distribution.
131ba4a712SPawel Jakub Dawidek  *
141ba4a712SPawel Jakub Dawidek  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
151ba4a712SPawel Jakub Dawidek  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
161ba4a712SPawel Jakub Dawidek  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
171ba4a712SPawel Jakub Dawidek  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
181ba4a712SPawel Jakub Dawidek  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
191ba4a712SPawel Jakub Dawidek  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
201ba4a712SPawel Jakub Dawidek  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
211ba4a712SPawel Jakub Dawidek  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
221ba4a712SPawel Jakub Dawidek  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
231ba4a712SPawel Jakub Dawidek  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
241ba4a712SPawel Jakub Dawidek  * SUCH DAMAGE.
251ba4a712SPawel Jakub Dawidek  */
261ba4a712SPawel Jakub Dawidek 
271ba4a712SPawel Jakub Dawidek #include <sys/cdefs.h>
281ba4a712SPawel Jakub Dawidek __FBSDID("$FreeBSD$");
291ba4a712SPawel Jakub Dawidek 
301ba4a712SPawel Jakub Dawidek #include <sys/param.h>
311ba4a712SPawel Jakub Dawidek #include <sys/kernel.h>
321ba4a712SPawel Jakub Dawidek #include <sys/systm.h>
331ba4a712SPawel Jakub Dawidek #include <sys/sysctl.h>
341ba4a712SPawel Jakub Dawidek #include <sys/errno.h>
3549939083SJamie Gritton #include <sys/jail.h>
361ba4a712SPawel Jakub Dawidek #include <sys/malloc.h>
371ba4a712SPawel Jakub Dawidek #include <sys/lock.h>
381ba4a712SPawel Jakub Dawidek #include <sys/mutex.h>
3961304249SJamie Gritton #include <sys/rmlock.h>
4061304249SJamie Gritton #include <sys/sx.h>
411ba4a712SPawel Jakub Dawidek #include <sys/queue.h>
421ba4a712SPawel Jakub Dawidek #include <sys/proc.h>
431ba4a712SPawel Jakub Dawidek #include <sys/osd.h>
441ba4a712SPawel Jakub Dawidek 
451ba4a712SPawel Jakub Dawidek /* OSD (Object Specific Data) */
461ba4a712SPawel Jakub Dawidek 
47859f4d06SJamie Gritton /*
48859f4d06SJamie Gritton  * Lock key:
49859f4d06SJamie Gritton  *  (m) osd_module_lock
50859f4d06SJamie Gritton  *  (o) osd_object_lock
51859f4d06SJamie Gritton  *  (l) osd_list_lock
52859f4d06SJamie Gritton  */
53859f4d06SJamie Gritton struct osd_master {
54859f4d06SJamie Gritton 	struct sx		 osd_module_lock;
55859f4d06SJamie Gritton 	struct rmlock		 osd_object_lock;
56859f4d06SJamie Gritton 	struct mtx		 osd_list_lock;
57320d8421SJamie Gritton 	LIST_HEAD(, osd)	 osd_list;		/* (l) */
58859f4d06SJamie Gritton 	osd_destructor_t	*osd_destructors;	/* (o) */
59859f4d06SJamie Gritton 	osd_method_t		*osd_methods;		/* (m) */
60859f4d06SJamie Gritton 	u_int			 osd_ntslots;		/* (m) */
61859f4d06SJamie Gritton 	const u_int		 osd_nmethods;
62859f4d06SJamie Gritton };
63859f4d06SJamie Gritton 
641ba4a712SPawel Jakub Dawidek static MALLOC_DEFINE(M_OSD, "osd", "Object Specific Data");
651ba4a712SPawel Jakub Dawidek 
661ba4a712SPawel Jakub Dawidek static int osd_debug = 0;
67af3b2549SHans Petter Selasky SYSCTL_INT(_debug, OID_AUTO, osd, CTLFLAG_RWTUN, &osd_debug, 0, "OSD debug level");
681ba4a712SPawel Jakub Dawidek 
691ba4a712SPawel Jakub Dawidek #define	OSD_DEBUG(...)	do {						\
701ba4a712SPawel Jakub Dawidek 	if (osd_debug) {						\
711ba4a712SPawel Jakub Dawidek 		printf("OSD (%s:%u): ", __func__, __LINE__);		\
721ba4a712SPawel Jakub Dawidek 		printf(__VA_ARGS__);					\
731ba4a712SPawel Jakub Dawidek 		printf("\n");						\
741ba4a712SPawel Jakub Dawidek 	}								\
751ba4a712SPawel Jakub Dawidek } while (0)
761ba4a712SPawel Jakub Dawidek 
7761304249SJamie Gritton static void do_osd_del(u_int type, struct osd *osd, u_int slot,
7861304249SJamie Gritton     int list_locked);
7961304249SJamie Gritton 
801ba4a712SPawel Jakub Dawidek /*
81859f4d06SJamie Gritton  * List of objects with OSD.
821ba4a712SPawel Jakub Dawidek  */
83859f4d06SJamie Gritton struct osd_master osdm[OSD_LAST + 1] = {
84859f4d06SJamie Gritton 	[OSD_JAIL] = { .osd_nmethods = PR_MAXMETHOD },
85b38ff370SJamie Gritton };
8661304249SJamie Gritton 
871ba4a712SPawel Jakub Dawidek static void
881ba4a712SPawel Jakub Dawidek osd_default_destructor(void *value __unused)
891ba4a712SPawel Jakub Dawidek {
901ba4a712SPawel Jakub Dawidek 	/* Do nothing. */
911ba4a712SPawel Jakub Dawidek }
921ba4a712SPawel Jakub Dawidek 
931ba4a712SPawel Jakub Dawidek int
9461304249SJamie Gritton osd_register(u_int type, osd_destructor_t destructor, osd_method_t *methods)
951ba4a712SPawel Jakub Dawidek {
961ba4a712SPawel Jakub Dawidek 	void *newptr;
9761304249SJamie Gritton 	u_int i, m;
981ba4a712SPawel Jakub Dawidek 
991ba4a712SPawel Jakub Dawidek 	KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
1001ba4a712SPawel Jakub Dawidek 
1011ba4a712SPawel Jakub Dawidek 	/*
1021ba4a712SPawel Jakub Dawidek 	 * If no destructor is given, use default one. We need to use some
1031ba4a712SPawel Jakub Dawidek 	 * destructor, because NULL destructor means unused slot.
1041ba4a712SPawel Jakub Dawidek 	 */
1051ba4a712SPawel Jakub Dawidek 	if (destructor == NULL)
1061ba4a712SPawel Jakub Dawidek 		destructor = osd_default_destructor;
1071ba4a712SPawel Jakub Dawidek 
108859f4d06SJamie Gritton 	sx_xlock(&osdm[type].osd_module_lock);
1091ba4a712SPawel Jakub Dawidek 	/*
1101ba4a712SPawel Jakub Dawidek 	 * First, we try to find unused slot.
1111ba4a712SPawel Jakub Dawidek 	 */
112859f4d06SJamie Gritton 	for (i = 0; i < osdm[type].osd_ntslots; i++) {
113859f4d06SJamie Gritton 		if (osdm[type].osd_destructors[i] == NULL) {
1141ba4a712SPawel Jakub Dawidek 			OSD_DEBUG("Unused slot found (type=%u, slot=%u).",
1151ba4a712SPawel Jakub Dawidek 			    type, i);
1161ba4a712SPawel Jakub Dawidek 			break;
1171ba4a712SPawel Jakub Dawidek 		}
1181ba4a712SPawel Jakub Dawidek 	}
1191ba4a712SPawel Jakub Dawidek 	/*
1201ba4a712SPawel Jakub Dawidek 	 * If no unused slot was found, allocate one.
1211ba4a712SPawel Jakub Dawidek 	 */
122859f4d06SJamie Gritton 	if (i == osdm[type].osd_ntslots) {
123859f4d06SJamie Gritton 		osdm[type].osd_ntslots++;
124859f4d06SJamie Gritton 		if (osdm[type].osd_nmethods != 0)
125859f4d06SJamie Gritton 			osdm[type].osd_methods = realloc(osdm[type].osd_methods,
126859f4d06SJamie Gritton 			    sizeof(osd_method_t) * osdm[type].osd_ntslots *
127859f4d06SJamie Gritton 			    osdm[type].osd_nmethods, M_OSD, M_WAITOK);
128859f4d06SJamie Gritton 		newptr = malloc(sizeof(osd_destructor_t) *
129859f4d06SJamie Gritton 		    osdm[type].osd_ntslots, M_OSD, M_WAITOK);
130859f4d06SJamie Gritton 		rm_wlock(&osdm[type].osd_object_lock);
131859f4d06SJamie Gritton 		bcopy(osdm[type].osd_destructors, newptr,
13261304249SJamie Gritton 		    sizeof(osd_destructor_t) * i);
133859f4d06SJamie Gritton 		free(osdm[type].osd_destructors, M_OSD);
134859f4d06SJamie Gritton 		osdm[type].osd_destructors = newptr;
135859f4d06SJamie Gritton 		rm_wunlock(&osdm[type].osd_object_lock);
1361ba4a712SPawel Jakub Dawidek 		OSD_DEBUG("New slot allocated (type=%u, slot=%u).",
1371ba4a712SPawel Jakub Dawidek 		    type, i + 1);
1381ba4a712SPawel Jakub Dawidek 	}
13961304249SJamie Gritton 
140859f4d06SJamie Gritton 	osdm[type].osd_destructors[i] = destructor;
141859f4d06SJamie Gritton 	if (osdm[type].osd_nmethods != 0) {
142859f4d06SJamie Gritton 		for (m = 0; m < osdm[type].osd_nmethods; m++)
143859f4d06SJamie Gritton 			osdm[type].osd_methods[i * osdm[type].osd_nmethods + m]
144859f4d06SJamie Gritton 			    = methods != NULL ? methods[m] : NULL;
14561304249SJamie Gritton 	}
146859f4d06SJamie Gritton 	sx_xunlock(&osdm[type].osd_module_lock);
1471ba4a712SPawel Jakub Dawidek 	return (i + 1);
1481ba4a712SPawel Jakub Dawidek }
1491ba4a712SPawel Jakub Dawidek 
1501ba4a712SPawel Jakub Dawidek void
1511ba4a712SPawel Jakub Dawidek osd_deregister(u_int type, u_int slot)
1521ba4a712SPawel Jakub Dawidek {
1531ba4a712SPawel Jakub Dawidek 	struct osd *osd, *tosd;
1541ba4a712SPawel Jakub Dawidek 
1551ba4a712SPawel Jakub Dawidek 	KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
1561ba4a712SPawel Jakub Dawidek 	KASSERT(slot > 0, ("Invalid slot."));
157859f4d06SJamie Gritton 	KASSERT(osdm[type].osd_destructors[slot - 1] != NULL, ("Unused slot."));
1581ba4a712SPawel Jakub Dawidek 
159859f4d06SJamie Gritton 	sx_xlock(&osdm[type].osd_module_lock);
160859f4d06SJamie Gritton 	rm_wlock(&osdm[type].osd_object_lock);
1611ba4a712SPawel Jakub Dawidek 	/*
1621ba4a712SPawel Jakub Dawidek 	 * Free all OSD for the given slot.
1631ba4a712SPawel Jakub Dawidek 	 */
164859f4d06SJamie Gritton 	mtx_lock(&osdm[type].osd_list_lock);
165859f4d06SJamie Gritton 	LIST_FOREACH_SAFE(osd, &osdm[type].osd_list, osd_next, tosd)
16661304249SJamie Gritton 		do_osd_del(type, osd, slot, 1);
167859f4d06SJamie Gritton 	mtx_unlock(&osdm[type].osd_list_lock);
1681ba4a712SPawel Jakub Dawidek 	/*
1691ba4a712SPawel Jakub Dawidek 	 * Set destructor to NULL to free the slot.
1701ba4a712SPawel Jakub Dawidek 	 */
171859f4d06SJamie Gritton 	osdm[type].osd_destructors[slot - 1] = NULL;
172859f4d06SJamie Gritton 	if (slot == osdm[type].osd_ntslots) {
173859f4d06SJamie Gritton 		osdm[type].osd_ntslots--;
174859f4d06SJamie Gritton 		osdm[type].osd_destructors = realloc(osdm[type].osd_destructors,
175859f4d06SJamie Gritton 		    sizeof(osd_destructor_t) * osdm[type].osd_ntslots, M_OSD,
1761ba4a712SPawel Jakub Dawidek 		    M_NOWAIT | M_ZERO);
177859f4d06SJamie Gritton 		if (osdm[type].osd_nmethods != 0)
178859f4d06SJamie Gritton 			osdm[type].osd_methods = realloc(osdm[type].osd_methods,
179859f4d06SJamie Gritton 			    sizeof(osd_method_t) * osdm[type].osd_ntslots *
180859f4d06SJamie Gritton 			    osdm[type].osd_nmethods, M_OSD, M_NOWAIT | M_ZERO);
1811ba4a712SPawel Jakub Dawidek 		/*
1821ba4a712SPawel Jakub Dawidek 		 * We always reallocate to smaller size, so we assume it will
1831ba4a712SPawel Jakub Dawidek 		 * always succeed.
1841ba4a712SPawel Jakub Dawidek 		 */
185859f4d06SJamie Gritton 		KASSERT(osdm[type].osd_destructors != NULL &&
186859f4d06SJamie Gritton 		    (osdm[type].osd_nmethods == 0 ||
187859f4d06SJamie Gritton 		     osdm[type].osd_methods != NULL), ("realloc() failed"));
1881ba4a712SPawel Jakub Dawidek 		OSD_DEBUG("Deregistration of the last slot (type=%u, slot=%u).",
1891ba4a712SPawel Jakub Dawidek 		    type, slot);
1901ba4a712SPawel Jakub Dawidek 	} else {
1911ba4a712SPawel Jakub Dawidek 		OSD_DEBUG("Slot deregistration (type=%u, slot=%u).",
1921ba4a712SPawel Jakub Dawidek 		    type, slot);
1931ba4a712SPawel Jakub Dawidek 	}
194859f4d06SJamie Gritton 	rm_wunlock(&osdm[type].osd_object_lock);
195859f4d06SJamie Gritton 	sx_xunlock(&osdm[type].osd_module_lock);
1961ba4a712SPawel Jakub Dawidek }
1971ba4a712SPawel Jakub Dawidek 
1981ba4a712SPawel Jakub Dawidek int
1991ba4a712SPawel Jakub Dawidek osd_set(u_int type, struct osd *osd, u_int slot, void *value)
2001ba4a712SPawel Jakub Dawidek {
201320d8421SJamie Gritton 
202320d8421SJamie Gritton 	return (osd_set_reserved(type, osd, slot, NULL, value));
203320d8421SJamie Gritton }
204320d8421SJamie Gritton 
205*aa90aec2SConrad Meyer void **
206320d8421SJamie Gritton osd_reserve(u_int slot)
207320d8421SJamie Gritton {
208320d8421SJamie Gritton 
209320d8421SJamie Gritton 	KASSERT(slot > 0, ("Invalid slot."));
210320d8421SJamie Gritton 
211320d8421SJamie Gritton 	OSD_DEBUG("Reserving slot array (slot=%u).", slot);
212320d8421SJamie Gritton 	return (malloc(sizeof(void *) * slot, M_OSD, M_WAITOK | M_ZERO));
213320d8421SJamie Gritton }
214320d8421SJamie Gritton 
215320d8421SJamie Gritton int
216*aa90aec2SConrad Meyer osd_set_reserved(u_int type, struct osd *osd, u_int slot, void **rsv,
217320d8421SJamie Gritton     void *value)
218320d8421SJamie Gritton {
21961304249SJamie Gritton 	struct rm_priotracker tracker;
2201ba4a712SPawel Jakub Dawidek 
2211ba4a712SPawel Jakub Dawidek 	KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
2221ba4a712SPawel Jakub Dawidek 	KASSERT(slot > 0, ("Invalid slot."));
223859f4d06SJamie Gritton 	KASSERT(osdm[type].osd_destructors[slot - 1] != NULL, ("Unused slot."));
2241ba4a712SPawel Jakub Dawidek 
225859f4d06SJamie Gritton 	rm_rlock(&osdm[type].osd_object_lock, &tracker);
22661304249SJamie Gritton 	if (slot > osd->osd_nslots) {
227*aa90aec2SConrad Meyer 		void **newptr;
228320d8421SJamie Gritton 
22961304249SJamie Gritton 		if (value == NULL) {
23061304249SJamie Gritton 			OSD_DEBUG(
23161304249SJamie Gritton 			    "Not allocating null slot (type=%u, slot=%u).",
23261304249SJamie Gritton 			    type, slot);
233859f4d06SJamie Gritton 			rm_runlock(&osdm[type].osd_object_lock, &tracker);
234320d8421SJamie Gritton 			if (rsv)
235320d8421SJamie Gritton 				osd_free_reserved(rsv);
23661304249SJamie Gritton 			return (0);
23761304249SJamie Gritton 		}
2381ba4a712SPawel Jakub Dawidek 
2391ba4a712SPawel Jakub Dawidek 		/*
240320d8421SJamie Gritton 		 * Too few slots allocated here, so we need to extend or create
24161304249SJamie Gritton 		 * the array.
2421ba4a712SPawel Jakub Dawidek 		 */
243320d8421SJamie Gritton 		if (rsv) {
244320d8421SJamie Gritton 			/*
245320d8421SJamie Gritton 			 * Use the reserve passed in (assumed to be
246320d8421SJamie Gritton 			 * the right size).
247320d8421SJamie Gritton 			 */
248320d8421SJamie Gritton 			newptr = rsv;
249320d8421SJamie Gritton 			if (osd->osd_nslots != 0) {
250320d8421SJamie Gritton 				memcpy(newptr, osd->osd_slots,
251320d8421SJamie Gritton 				    sizeof(void *) * osd->osd_nslots);
252320d8421SJamie Gritton 				free(osd->osd_slots, M_OSD);
253320d8421SJamie Gritton 			}
254320d8421SJamie Gritton 		} else {
25561304249SJamie Gritton 			newptr = realloc(osd->osd_slots, sizeof(void *) * slot,
25661304249SJamie Gritton 			    M_OSD, M_NOWAIT | M_ZERO);
25761304249SJamie Gritton 			if (newptr == NULL) {
258859f4d06SJamie Gritton 				rm_runlock(&osdm[type].osd_object_lock,
259859f4d06SJamie Gritton 				    &tracker);
2601ba4a712SPawel Jakub Dawidek 				return (ENOMEM);
26161304249SJamie Gritton 			}
262320d8421SJamie Gritton 		}
263320d8421SJamie Gritton 		if (osd->osd_nslots == 0) {
264320d8421SJamie Gritton 			/*
265320d8421SJamie Gritton 			 * First OSD for this object, so we need to put it
266320d8421SJamie Gritton 			 * onto the list.
267320d8421SJamie Gritton 			 */
268320d8421SJamie Gritton 			mtx_lock(&osdm[type].osd_list_lock);
269320d8421SJamie Gritton 			LIST_INSERT_HEAD(&osdm[type].osd_list, osd, osd_next);
270320d8421SJamie Gritton 			mtx_unlock(&osdm[type].osd_list_lock);
271320d8421SJamie Gritton 			OSD_DEBUG("Setting first slot (type=%u).", type);
272320d8421SJamie Gritton 		} else
273320d8421SJamie Gritton 			OSD_DEBUG("Growing slots array (type=%u).", type);
2741ba4a712SPawel Jakub Dawidek 		osd->osd_slots = newptr;
2751ba4a712SPawel Jakub Dawidek 		osd->osd_nslots = slot;
276320d8421SJamie Gritton 	} else if (rsv)
277320d8421SJamie Gritton 		osd_free_reserved(rsv);
2781ba4a712SPawel Jakub Dawidek 	OSD_DEBUG("Setting slot value (type=%u, slot=%u, value=%p).", type,
2791ba4a712SPawel Jakub Dawidek 	    slot, value);
2801ba4a712SPawel Jakub Dawidek 	osd->osd_slots[slot - 1] = value;
281859f4d06SJamie Gritton 	rm_runlock(&osdm[type].osd_object_lock, &tracker);
2821ba4a712SPawel Jakub Dawidek 	return (0);
2831ba4a712SPawel Jakub Dawidek }
2841ba4a712SPawel Jakub Dawidek 
285320d8421SJamie Gritton void
286*aa90aec2SConrad Meyer osd_free_reserved(void **rsv)
287320d8421SJamie Gritton {
288320d8421SJamie Gritton 
289320d8421SJamie Gritton 	OSD_DEBUG("Discarding reserved slot array.");
290320d8421SJamie Gritton 	free(rsv, M_OSD);
291320d8421SJamie Gritton }
292320d8421SJamie Gritton 
2931ba4a712SPawel Jakub Dawidek void *
2941ba4a712SPawel Jakub Dawidek osd_get(u_int type, struct osd *osd, u_int slot)
2951ba4a712SPawel Jakub Dawidek {
29661304249SJamie Gritton 	struct rm_priotracker tracker;
29761304249SJamie Gritton 	void *value;
2981ba4a712SPawel Jakub Dawidek 
2991ba4a712SPawel Jakub Dawidek 	KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
3001ba4a712SPawel Jakub Dawidek 	KASSERT(slot > 0, ("Invalid slot."));
301859f4d06SJamie Gritton 	KASSERT(osdm[type].osd_destructors[slot - 1] != NULL, ("Unused slot."));
3021ba4a712SPawel Jakub Dawidek 
303859f4d06SJamie Gritton 	rm_rlock(&osdm[type].osd_object_lock, &tracker);
3041ba4a712SPawel Jakub Dawidek 	if (slot > osd->osd_nslots) {
30561304249SJamie Gritton 		value = NULL;
3061ba4a712SPawel Jakub Dawidek 		OSD_DEBUG("Slot doesn't exist (type=%u, slot=%u).", type, slot);
30761304249SJamie Gritton 	} else {
30861304249SJamie Gritton 		value = osd->osd_slots[slot - 1];
30961304249SJamie Gritton 		OSD_DEBUG("Returning slot value (type=%u, slot=%u, value=%p).",
31061304249SJamie Gritton 		    type, slot, value);
3111ba4a712SPawel Jakub Dawidek 	}
312859f4d06SJamie Gritton 	rm_runlock(&osdm[type].osd_object_lock, &tracker);
31361304249SJamie Gritton 	return (value);
3141ba4a712SPawel Jakub Dawidek }
3151ba4a712SPawel Jakub Dawidek 
3161ba4a712SPawel Jakub Dawidek void
3171ba4a712SPawel Jakub Dawidek osd_del(u_int type, struct osd *osd, u_int slot)
3181ba4a712SPawel Jakub Dawidek {
31961304249SJamie Gritton 	struct rm_priotracker tracker;
32061304249SJamie Gritton 
321859f4d06SJamie Gritton 	rm_rlock(&osdm[type].osd_object_lock, &tracker);
32261304249SJamie Gritton 	do_osd_del(type, osd, slot, 0);
323859f4d06SJamie Gritton 	rm_runlock(&osdm[type].osd_object_lock, &tracker);
32461304249SJamie Gritton }
32561304249SJamie Gritton 
32661304249SJamie Gritton static void
32761304249SJamie Gritton do_osd_del(u_int type, struct osd *osd, u_int slot, int list_locked)
32861304249SJamie Gritton {
3291ba4a712SPawel Jakub Dawidek 	int i;
3301ba4a712SPawel Jakub Dawidek 
3311ba4a712SPawel Jakub Dawidek 	KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
3321ba4a712SPawel Jakub Dawidek 	KASSERT(slot > 0, ("Invalid slot."));
333859f4d06SJamie Gritton 	KASSERT(osdm[type].osd_destructors[slot - 1] != NULL, ("Unused slot."));
3341ba4a712SPawel Jakub Dawidek 
3351ba4a712SPawel Jakub Dawidek 	OSD_DEBUG("Deleting slot (type=%u, slot=%u).", type, slot);
3361ba4a712SPawel Jakub Dawidek 
3371ba4a712SPawel Jakub Dawidek 	if (slot > osd->osd_nslots) {
3381ba4a712SPawel Jakub Dawidek 		OSD_DEBUG("Slot doesn't exist (type=%u, slot=%u).", type, slot);
3391ba4a712SPawel Jakub Dawidek 		return;
3401ba4a712SPawel Jakub Dawidek 	}
3413dd4fac9SJamie Gritton 	if (osd->osd_slots[slot - 1] != NULL) {
342859f4d06SJamie Gritton 		osdm[type].osd_destructors[slot - 1](osd->osd_slots[slot - 1]);
3431ba4a712SPawel Jakub Dawidek 		osd->osd_slots[slot - 1] = NULL;
3443dd4fac9SJamie Gritton 	}
3451ba4a712SPawel Jakub Dawidek 	for (i = osd->osd_nslots - 1; i >= 0; i--) {
3461ba4a712SPawel Jakub Dawidek 		if (osd->osd_slots[i] != NULL) {
34761304249SJamie Gritton 			OSD_DEBUG("Slot still has a value (type=%u, slot=%u).",
34861304249SJamie Gritton 			    type, i + 1);
3491ba4a712SPawel Jakub Dawidek 			break;
3501ba4a712SPawel Jakub Dawidek 		}
3511ba4a712SPawel Jakub Dawidek 	}
3521ba4a712SPawel Jakub Dawidek 	if (i == -1) {
3531ba4a712SPawel Jakub Dawidek 		/* No values left for this object. */
3541ba4a712SPawel Jakub Dawidek 		OSD_DEBUG("No more slots left (type=%u).", type);
35561304249SJamie Gritton 		if (!list_locked)
356859f4d06SJamie Gritton 			mtx_lock(&osdm[type].osd_list_lock);
3571ba4a712SPawel Jakub Dawidek 		LIST_REMOVE(osd, osd_next);
35861304249SJamie Gritton 		if (!list_locked)
359859f4d06SJamie Gritton 			mtx_unlock(&osdm[type].osd_list_lock);
3601ba4a712SPawel Jakub Dawidek 		free(osd->osd_slots, M_OSD);
3611ba4a712SPawel Jakub Dawidek 		osd->osd_slots = NULL;
3621ba4a712SPawel Jakub Dawidek 		osd->osd_nslots = 0;
3631ba4a712SPawel Jakub Dawidek 	} else if (slot == osd->osd_nslots) {
3641ba4a712SPawel Jakub Dawidek 		/* This was the last slot. */
3651ba4a712SPawel Jakub Dawidek 		osd->osd_slots = realloc(osd->osd_slots,
3661ba4a712SPawel Jakub Dawidek 		    sizeof(void *) * (i + 1), M_OSD, M_NOWAIT | M_ZERO);
3671ba4a712SPawel Jakub Dawidek 		/*
3681ba4a712SPawel Jakub Dawidek 		 * We always reallocate to smaller size, so we assume it will
3691ba4a712SPawel Jakub Dawidek 		 * always succeed.
3701ba4a712SPawel Jakub Dawidek 		 */
3711ba4a712SPawel Jakub Dawidek 		KASSERT(osd->osd_slots != NULL, ("realloc() failed"));
3721ba4a712SPawel Jakub Dawidek 		osd->osd_nslots = i + 1;
3731ba4a712SPawel Jakub Dawidek 		OSD_DEBUG("Reducing slots array to %u (type=%u).",
3741ba4a712SPawel Jakub Dawidek 		    osd->osd_nslots, type);
3751ba4a712SPawel Jakub Dawidek 	}
3761ba4a712SPawel Jakub Dawidek }
3771ba4a712SPawel Jakub Dawidek 
37861304249SJamie Gritton int
37961304249SJamie Gritton osd_call(u_int type, u_int method, void *obj, void *data)
38061304249SJamie Gritton {
38161304249SJamie Gritton 	osd_method_t methodfun;
38261304249SJamie Gritton 	int error, i;
38361304249SJamie Gritton 
38461304249SJamie Gritton 	KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
385859f4d06SJamie Gritton 	KASSERT(method < osdm[type].osd_nmethods, ("Invalid method."));
38661304249SJamie Gritton 
38761304249SJamie Gritton 	/*
38861304249SJamie Gritton 	 * Call this method for every slot that defines it, stopping if an
38961304249SJamie Gritton 	 * error is encountered.
39061304249SJamie Gritton 	 */
39161304249SJamie Gritton 	error = 0;
392859f4d06SJamie Gritton 	sx_slock(&osdm[type].osd_module_lock);
393859f4d06SJamie Gritton 	for (i = 0; i < osdm[type].osd_ntslots; i++) {
394859f4d06SJamie Gritton 		methodfun = osdm[type].osd_methods[i * osdm[type].osd_nmethods +
395859f4d06SJamie Gritton 		    method];
39661304249SJamie Gritton 		if (methodfun != NULL && (error = methodfun(obj, data)) != 0)
39761304249SJamie Gritton 			break;
39861304249SJamie Gritton 	}
399859f4d06SJamie Gritton 	sx_sunlock(&osdm[type].osd_module_lock);
40061304249SJamie Gritton 	return (error);
40161304249SJamie Gritton }
40261304249SJamie Gritton 
4031ba4a712SPawel Jakub Dawidek void
4041ba4a712SPawel Jakub Dawidek osd_exit(u_int type, struct osd *osd)
4051ba4a712SPawel Jakub Dawidek {
40661304249SJamie Gritton 	struct rm_priotracker tracker;
4071ba4a712SPawel Jakub Dawidek 	u_int i;
4081ba4a712SPawel Jakub Dawidek 
4091ba4a712SPawel Jakub Dawidek 	KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
4101ba4a712SPawel Jakub Dawidek 
4111ba4a712SPawel Jakub Dawidek 	if (osd->osd_nslots == 0) {
4121ba4a712SPawel Jakub Dawidek 		KASSERT(osd->osd_slots == NULL, ("Non-null osd_slots."));
4131ba4a712SPawel Jakub Dawidek 		/* No OSD attached, just leave. */
4141ba4a712SPawel Jakub Dawidek 		return;
4151ba4a712SPawel Jakub Dawidek 	}
4161ba4a712SPawel Jakub Dawidek 
417859f4d06SJamie Gritton 	rm_rlock(&osdm[type].osd_object_lock, &tracker);
41861304249SJamie Gritton 	for (i = 1; i <= osd->osd_nslots; i++) {
419859f4d06SJamie Gritton 		if (osdm[type].osd_destructors[i - 1] != NULL)
42061304249SJamie Gritton 			do_osd_del(type, osd, i, 0);
42161304249SJamie Gritton 		else
42261304249SJamie Gritton 			OSD_DEBUG("Unused slot (type=%u, slot=%u).", type, i);
42361304249SJamie Gritton 	}
424859f4d06SJamie Gritton 	rm_runlock(&osdm[type].osd_object_lock, &tracker);
4251ba4a712SPawel Jakub Dawidek 	OSD_DEBUG("Object exit (type=%u).", type);
4261ba4a712SPawel Jakub Dawidek }
4271ba4a712SPawel Jakub Dawidek 
4281ba4a712SPawel Jakub Dawidek static void
4291ba4a712SPawel Jakub Dawidek osd_init(void *arg __unused)
4301ba4a712SPawel Jakub Dawidek {
4311ba4a712SPawel Jakub Dawidek 	u_int i;
4321ba4a712SPawel Jakub Dawidek 
4331ba4a712SPawel Jakub Dawidek 	for (i = OSD_FIRST; i <= OSD_LAST; i++) {
434859f4d06SJamie Gritton 		sx_init(&osdm[i].osd_module_lock, "osd_module");
435859f4d06SJamie Gritton 		rm_init(&osdm[i].osd_object_lock, "osd_object");
436859f4d06SJamie Gritton 		mtx_init(&osdm[i].osd_list_lock, "osd_list", NULL, MTX_DEF);
437859f4d06SJamie Gritton 		LIST_INIT(&osdm[i].osd_list);
438859f4d06SJamie Gritton 		osdm[i].osd_destructors = NULL;
439859f4d06SJamie Gritton 		osdm[i].osd_ntslots = 0;
440859f4d06SJamie Gritton 		osdm[i].osd_methods = NULL;
4411ba4a712SPawel Jakub Dawidek 	}
4421ba4a712SPawel Jakub Dawidek }
4431ba4a712SPawel Jakub Dawidek SYSINIT(osd, SI_SUB_LOCK, SI_ORDER_ANY, osd_init, NULL);
444