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📄 Make.tags.inc(2.13 KB)
📄 Makefile(302 B)
📄 bus_if.m(26.31 KB)
📄 capabilities.conf(13.67 KB)
📄 clock_if.m(1.7 KB)
📄 cpufreq_if.m(2.27 KB)
📄 device_if.m(10.41 KB)
📄 firmw.S(2.15 KB)
📄 genassym.sh(1.11 KB)
📄 genoffset.c(1.68 KB)
📄 genoffset.sh(3.58 KB)
📄 imgact_aout.c(9.45 KB)
📄 imgact_binmisc.c(18.64 KB)
📄 imgact_elf.c(76.32 KB)
📄 imgact_elf32.c(1.47 KB)
📄 imgact_elf64.c(1.47 KB)
📄 imgact_shell.c(8.41 KB)
📄 init_main.c(24.31 KB)
📄 init_sysent.c(95.3 KB)
📄 kern_acct.c(19.03 KB)
📄 kern_alq.c(24.97 KB)
📄 kern_clock.c(21.12 KB)
📄 kern_clocksource.c(23.34 KB)
📄 kern_condvar.c(11.28 KB)
📄 kern_conf.c(36.14 KB)
📄 kern_cons.c(15.75 KB)
📄 kern_context.c(3.59 KB)
📄 kern_cpu.c(30.77 KB)
📄 kern_cpuset.c(59.78 KB)
📄 kern_ctf.c(8.73 KB)
📄 kern_descrip.c(112.87 KB)
📄 kern_dtrace.c(2.94 KB)
📄 kern_dump.c(8.51 KB)
📄 kern_environment.c(22.75 KB)
📄 kern_et.c(7.1 KB)
📄 kern_event.c(62.49 KB)
📄 kern_exec.c(46.67 KB)
📄 kern_exit.c(34.61 KB)
📄 kern_fail.c(29.32 KB)
📄 kern_ffclock.c(12.66 KB)
📄 kern_fork.c(28.29 KB)
📄 kern_hhook.c(13.58 KB)
📄 kern_idle.c(2.74 KB)
📄 kern_intr.c(40.44 KB)
📄 kern_jail.c(112.67 KB)
📄 kern_kcov.c(15.32 KB)
📄 kern_khelp.c(9.45 KB)
📄 kern_kthread.c(11.8 KB)
📄 kern_ktr.c(11.93 KB)
📄 kern_ktrace.c(31.41 KB)
📄 kern_linker.c(54.3 KB)
📄 kern_lock.c(46.99 KB)
📄 kern_lockf.c(64.46 KB)
📄 kern_lockstat.c(3.8 KB)
📄 kern_loginclass.c(6.69 KB)
📄 kern_malloc.c(37.09 KB)
📄 kern_mbuf.c(43.16 KB)
📄 kern_mib.c(24.26 KB)
📄 kern_module.c(11.05 KB)
📄 kern_mtxpool.c(5.82 KB)
📄 kern_mutex.c(33.62 KB)
📄 kern_ntptime.c(32.49 KB)
📄 kern_osd.c(12.37 KB)
📄 kern_physio.c(5.74 KB)
📄 kern_pmc.c(8.89 KB)
📄 kern_poll.c(15.86 KB)
📄 kern_priv.c(9.14 KB)
📄 kern_proc.c(80.01 KB)
📄 kern_procctl.c(19.48 KB)
📄 kern_prot.c(57.94 KB)
📄 kern_racct.c(34.01 KB)
📄 kern_rangelock.c(8.67 KB)
📄 kern_rctl.c(53.87 KB)
📄 kern_resource.c(36.66 KB)
📄 kern_rmlock.c(28.27 KB)
📄 kern_rwlock.c(40.72 KB)
📄 kern_sdt.c(2.05 KB)
📄 kern_sema.c(4.85 KB)
📄 kern_sendfile.c(33.97 KB)
📄 kern_sharedpage.c(10.37 KB)
📄 kern_shutdown.c(43.34 KB)
📄 kern_sig.c(101.89 KB)
📄 kern_switch.c(13.85 KB)
📄 kern_sx.c(40.27 KB)
📄 kern_synch.c(18.17 KB)
📄 kern_syscalls.c(6.74 KB)
📄 kern_sysctl.c(67.24 KB)
📄 kern_tc.c(55.73 KB)
📄 kern_thr.c(14.14 KB)
📄 kern_thread.c(41.75 KB)
📄 kern_time.c(40.89 KB)
📄 kern_timeout.c(43.08 KB)
📄 kern_tslog.c(3.44 KB)
📄 kern_ubsan.c(50.74 KB)
📄 kern_umtx.c(107.14 KB)
📄 kern_uuid.c(11.68 KB)
📄 kern_xxx.c(10.44 KB)
📄 ksched.c(6.56 KB)
📄 link_elf.c(47.99 KB)
📄 link_elf_obj.c(44.41 KB)
📄 linker_if.m(3.96 KB)
📄 makesyscalls.sh(23.57 KB)
📄 md4c.c(7.89 KB)
📄 md5c.c(9.56 KB)
📄 msi_if.m(2.48 KB)
📄 p1003_1b.c(8.84 KB)
📄 pic_if.m(3.9 KB)
📄 posix4_mib.c(5.59 KB)
📄 sched_4bsd.c(45.03 KB)
📄 sched_ule.c(82.65 KB)
📄 serdev_if.m(3.49 KB)
📄 stack_protector.c(613 B)
📄 subr_acl_nfs4.c(37.42 KB)
📄 subr_acl_posix1e.c(17.71 KB)
📄 subr_atomic64.c(3.97 KB)
📄 subr_autoconf.c(7.7 KB)
📄 subr_blist.c(31.88 KB)
📄 subr_boot.c(5.8 KB)
📄 subr_bufring.c(2.21 KB)
📄 subr_bus.c(145.4 KB)
📄 subr_bus_dma.c(19.67 KB)
📄 subr_busdma_bufalloc.c(5.24 KB)
📄 subr_capability.c(11.93 KB)
📄 subr_clock.c(10.61 KB)
📄 subr_compressor.c(13.11 KB)
📄 subr_counter.c(4.44 KB)
📄 subr_coverage.c(6.17 KB)
📄 subr_csan.c(25.39 KB)
📄 subr_devmap.c(9.8 KB)
📄 subr_devstat.c(16.21 KB)
📄 subr_disk.c(8.54 KB)
📄 subr_dummy_vdso_tc.c(1.7 KB)
📄 subr_early.c(2.26 KB)
📄 subr_epoch.c(25.02 KB)
📄 subr_eventhandler.c(9.17 KB)
📄 subr_fattime.c(9.98 KB)
📄 subr_filter.c(12.2 KB)
📄 subr_firmware.c(13.88 KB)
📄 subr_gtaskqueue.c(20.19 KB)
📄 subr_hash.c(4.8 KB)
📄 subr_hints.c(12.87 KB)
📄 subr_intr.c(40.61 KB)
📄 subr_kdb.c(16.13 KB)
📄 subr_kobj.c(7.1 KB)
📄 subr_lock.c(18.81 KB)
📄 subr_log.c(7.64 KB)
📄 subr_mchain.c(11.06 KB)
📄 subr_module.c(12.98 KB)
📄 subr_msgbuf.c(10.6 KB)
📄 subr_param.c(10.93 KB)
📄 subr_pcpu.c(10.18 KB)
📄 subr_pctrie.c(20.99 KB)
📄 subr_physmem.c(11.52 KB)
📄 subr_pidctrl.c(5.43 KB)
📄 subr_power.c(3.13 KB)
📄 subr_prf.c(27.42 KB)
📄 subr_prng.c(3.36 KB)
📄 subr_prof.c(15.43 KB)
📄 subr_rangeset.c(8.5 KB)
📄 subr_rman.c(27.61 KB)
📄 subr_rtc.c(11.42 KB)
📄 subr_sbuf.c(20.53 KB)
📄 subr_scanf.c(15.59 KB)
📄 subr_sfbuf.c(6.17 KB)
📄 subr_sglist.c(22.83 KB)
📄 subr_sleepqueue.c(39.43 KB)
📄 subr_smp.c(31.62 KB)
📄 subr_smr.c(20.17 KB)
📄 subr_stack.c(6.47 KB)
📄 subr_stats.c(103.01 KB)
📄 subr_syscall.c(7.98 KB)
📄 subr_taskqueue.c(21.1 KB)
📄 subr_terminal.c(15.52 KB)
📄 subr_trap.c(10.87 KB)
📄 subr_turnstile.c(35.58 KB)
📄 subr_uio.c(11.38 KB)
📄 subr_unit.c(22.97 KB)
📄 subr_vmem.c(43.25 KB)
📄 subr_witness.c(84.59 KB)
📄 sys_capability.c(15.06 KB)
📄 sys_eventfd.c(8.42 KB)
📄 sys_generic.c(44.22 KB)
📄 sys_getrandom.c(4.21 KB)
📄 sys_pipe.c(45.14 KB)
📄 sys_procdesc.c(14.57 KB)
📄 sys_process.c(30.73 KB)
📄 sys_socket.c(20.11 KB)
📄 syscalls.c(22.73 KB)
📄 syscalls.master(60.26 KB)
📄 systrace_args.c(178.49 KB)
📄 sysv_ipc.c(6.53 KB)
📄 sysv_msg.c(48.65 KB)
📄 sysv_sem.c(49.85 KB)
📄 sysv_shm.c(43.93 KB)
📄 tty.c(55.14 KB)
📄 tty_compat.c(11.46 KB)
📄 tty_info.c(9.93 KB)
📄 tty_inq.c(12.22 KB)
📄 tty_outq.c(8.74 KB)
📄 tty_pts.c(19.74 KB)
📄 tty_tty.c(2.83 KB)
📄 tty_ttydisc.c(28.6 KB)
📄 uipc_accf.c(8.07 KB)
📄 uipc_debug.c(12.42 KB)
📄 uipc_domain.c(13.13 KB)
📄 uipc_ktls.c(55.7 KB)
📄 uipc_mbuf.c(52.45 KB)
📄 uipc_mbuf2.c(12.64 KB)
📄 uipc_mbufhash.c(4.9 KB)
📄 uipc_mqueue.c(64.64 KB)
📄 uipc_sem.c(25.18 KB)
📄 uipc_shm.c(50.47 KB)
📄 uipc_sockbuf.c(42.9 KB)
📄 uipc_socket.c(110.61 KB)
📄 uipc_syscalls.c(35.94 KB)
📄 uipc_usrreq.c(75.11 KB)
📄 vfs_acl.c(14.5 KB)
📄 vfs_aio.c(76.32 KB)
📄 vfs_bio.c(145.39 KB)
📄 vfs_cache.c(143.09 KB)
📄 vfs_cluster.c(28.36 KB)
📄 vfs_default.c(33.16 KB)
📄 vfs_export.c(14.55 KB)
📄 vfs_extattr.c(17.91 KB)
📄 vfs_hash.c(6 KB)
📄 vfs_init.c(15.86 KB)
📄 vfs_lookup.c(45.48 KB)
📄 vfs_mount.c(62.58 KB)
📄 vfs_mountroot.c(26.23 KB)
📄 vfs_subr.c(167.52 KB)
📄 vfs_syscalls.c(106.86 KB)
📄 vfs_vnops.c(86.28 KB)
📄 vnode_if.src(13.66 KB)

Editing: kern_osd.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/jail.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/rmlock.h>
#include <sys/sx.h>
#include <sys/queue.h>
#include <sys/proc.h>
#include <sys/osd.h>

/* OSD (Object Specific Data) */

/*
 * Lock key:
 *  (m) osd_module_lock
 *  (o) osd_object_lock
 *  (l) osd_list_lock
 */
struct osd_master {
	struct sx		 osd_module_lock;
	struct rmlock		 osd_object_lock;
	struct mtx		 osd_list_lock;
	LIST_HEAD(, osd)	 osd_list;		/* (l) */
	osd_destructor_t	*osd_destructors;	/* (o) */
	osd_method_t		*osd_methods;		/* (m) */
	u_int			 osd_ntslots;		/* (m) */
	const u_int		 osd_nmethods;
};

static MALLOC_DEFINE(M_OSD, "osd", "Object Specific Data");

static int osd_debug = 0;
SYSCTL_INT(_debug, OID_AUTO, osd, CTLFLAG_RWTUN, &osd_debug, 0, "OSD debug level");

#define	OSD_DEBUG(...)	do {						\
	if (osd_debug) {						\
		printf("OSD (%s:%u): ", __func__, __LINE__);		\
		printf(__VA_ARGS__);					\
		printf("\n");						\
	}								\
} while (0)

static void do_osd_del(u_int type, struct osd *osd, u_int slot,
    int list_locked);

/*
 * List of objects with OSD.
 */
struct osd_master osdm[OSD_LAST + 1] = {
	[OSD_JAIL] = { .osd_nmethods = PR_MAXMETHOD },
};

static void
osd_default_destructor(void *value __unused)
{
	/* Do nothing. */
}

int
osd_register(u_int type, osd_destructor_t destructor, osd_method_t *methods)
{
	void *newptr;
	u_int i, m;

KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));

/*
	 * If no destructor is given, use default one. We need to use some
	 * destructor, because NULL destructor means unused slot.
	 */
	if (destructor == NULL)
		destructor = osd_default_destructor;

sx_xlock(&osdm[type].osd_module_lock);
	/*
	 * First, we try to find unused slot.
	 */
	for (i = 0; i < osdm[type].osd_ntslots; i++) {
		if (osdm[type].osd_destructors[i] == NULL) {
			OSD_DEBUG("Unused slot found (type=%u, slot=%u).",
			    type, i);
			break;
		}
	}
	/*
	 * If no unused slot was found, allocate one.
	 */
	if (i == osdm[type].osd_ntslots) {
		osdm[type].osd_ntslots++;
		if (osdm[type].osd_nmethods != 0)
			osdm[type].osd_methods = realloc(osdm[type].osd_methods,
			    sizeof(osd_method_t) * osdm[type].osd_ntslots *
			    osdm[type].osd_nmethods, M_OSD, M_WAITOK);
		newptr = malloc(sizeof(osd_destructor_t) *
		    osdm[type].osd_ntslots, M_OSD, M_WAITOK);
		rm_wlock(&osdm[type].osd_object_lock);
		bcopy(osdm[type].osd_destructors, newptr,
		    sizeof(osd_destructor_t) * i);
		free(osdm[type].osd_destructors, M_OSD);
		osdm[type].osd_destructors = newptr;
		rm_wunlock(&osdm[type].osd_object_lock);
		OSD_DEBUG("New slot allocated (type=%u, slot=%u).",
		    type, i + 1);
	}

osdm[type].osd_destructors[i] = destructor;
	if (osdm[type].osd_nmethods != 0) {
		for (m = 0; m < osdm[type].osd_nmethods; m++)
			osdm[type].osd_methods[i * osdm[type].osd_nmethods + m]
			    = methods != NULL ? methods[m] : NULL;
	}
	sx_xunlock(&osdm[type].osd_module_lock);
	return (i + 1);
}

void
osd_deregister(u_int type, u_int slot)
{
	struct osd *osd, *tosd;

KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
	KASSERT(slot > 0, ("Invalid slot."));
	KASSERT(osdm[type].osd_destructors[slot - 1] != NULL, ("Unused slot."));

sx_xlock(&osdm[type].osd_module_lock);
	rm_wlock(&osdm[type].osd_object_lock);
	/*
	 * Free all OSD for the given slot.
	 */
	mtx_lock(&osdm[type].osd_list_lock);
	LIST_FOREACH_SAFE(osd, &osdm[type].osd_list, osd_next, tosd)
		do_osd_del(type, osd, slot, 1);
	mtx_unlock(&osdm[type].osd_list_lock);
	/*
	 * Set destructor to NULL to free the slot.
	 */
	osdm[type].osd_destructors[slot - 1] = NULL;
	if (slot == osdm[type].osd_ntslots) {
		osdm[type].osd_ntslots--;
		osdm[type].osd_destructors = realloc(osdm[type].osd_destructors,
		    sizeof(osd_destructor_t) * osdm[type].osd_ntslots, M_OSD,
		    M_NOWAIT | M_ZERO);
		if (osdm[type].osd_nmethods != 0)
			osdm[type].osd_methods = realloc(osdm[type].osd_methods,
			    sizeof(osd_method_t) * osdm[type].osd_ntslots *
			    osdm[type].osd_nmethods, M_OSD, M_NOWAIT | M_ZERO);
		/*
		 * We always reallocate to smaller size, so we assume it will
		 * always succeed.
		 */
		KASSERT(osdm[type].osd_destructors != NULL &&
		    (osdm[type].osd_nmethods == 0 ||
		     osdm[type].osd_methods != NULL), ("realloc() failed"));
		OSD_DEBUG("Deregistration of the last slot (type=%u, slot=%u).",
		    type, slot);
	} else {
		OSD_DEBUG("Slot deregistration (type=%u, slot=%u).",
		    type, slot);
	}
	rm_wunlock(&osdm[type].osd_object_lock);
	sx_xunlock(&osdm[type].osd_module_lock);
}

int
osd_set(u_int type, struct osd *osd, u_int slot, void *value)
{

return (osd_set_reserved(type, osd, slot, NULL, value));
}

void **
osd_reserve(u_int slot)
{

KASSERT(slot > 0, ("Invalid slot."));

OSD_DEBUG("Reserving slot array (slot=%u).", slot);
	return (malloc(sizeof(void *) * slot, M_OSD, M_WAITOK | M_ZERO));
}

int
osd_set_reserved(u_int type, struct osd *osd, u_int slot, void **rsv,
    void *value)
{
	struct rm_priotracker tracker;

KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
	KASSERT(slot > 0, ("Invalid slot."));
	KASSERT(osdm[type].osd_destructors[slot - 1] != NULL, ("Unused slot."));

rm_rlock(&osdm[type].osd_object_lock, &tracker);
	if (slot > osd->osd_nslots) {
		void **newptr;

if (value == NULL) {
			OSD_DEBUG(
			    "Not allocating null slot (type=%u, slot=%u).",
			    type, slot);
			rm_runlock(&osdm[type].osd_object_lock, &tracker);
			if (rsv)
				osd_free_reserved(rsv);
			return (0);
		}

/*
		 * Too few slots allocated here, so we need to extend or create
		 * the array.
		 */
		if (rsv) {
			/*
			 * Use the reserve passed in (assumed to be
			 * the right size).
			 */
			newptr = rsv;
			if (osd->osd_nslots != 0) {
				memcpy(newptr, osd->osd_slots,
				    sizeof(void *) * osd->osd_nslots);
				free(osd->osd_slots, M_OSD);
			}
		} else {
			newptr = realloc(osd->osd_slots, sizeof(void *) * slot,
			    M_OSD, M_NOWAIT | M_ZERO);
			if (newptr == NULL) {
				rm_runlock(&osdm[type].osd_object_lock,
				    &tracker);
				return (ENOMEM);
			}
		}
		if (osd->osd_nslots == 0) {
			/*
			 * First OSD for this object, so we need to put it
			 * onto the list.
			 */
			mtx_lock(&osdm[type].osd_list_lock);
			LIST_INSERT_HEAD(&osdm[type].osd_list, osd, osd_next);
			mtx_unlock(&osdm[type].osd_list_lock);
			OSD_DEBUG("Setting first slot (type=%u).", type);
		} else
			OSD_DEBUG("Growing slots array (type=%u).", type);
		osd->osd_slots = newptr;
		osd->osd_nslots = slot;
	} else if (rsv)
		osd_free_reserved(rsv);
	OSD_DEBUG("Setting slot value (type=%u, slot=%u, value=%p).", type,
	    slot, value);
	osd->osd_slots[slot - 1] = value;
	rm_runlock(&osdm[type].osd_object_lock, &tracker);
	return (0);
}

void
osd_free_reserved(void **rsv)
{

OSD_DEBUG("Discarding reserved slot array.");
	free(rsv, M_OSD);
}

void *
osd_get(u_int type, struct osd *osd, u_int slot)
{
	struct rm_priotracker tracker;
	void *value;

KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
	KASSERT(slot > 0, ("Invalid slot."));
	KASSERT(osdm[type].osd_destructors[slot - 1] != NULL, ("Unused slot."));

rm_rlock(&osdm[type].osd_object_lock, &tracker);
	if (slot > osd->osd_nslots) {
		value = NULL;
		OSD_DEBUG("Slot doesn't exist (type=%u, slot=%u).", type, slot);
	} else {
		value = osd->osd_slots[slot - 1];
		OSD_DEBUG("Returning slot value (type=%u, slot=%u, value=%p).",
		    type, slot, value);
	}
	rm_runlock(&osdm[type].osd_object_lock, &tracker);
	return (value);
}

void
osd_del(u_int type, struct osd *osd, u_int slot)
{
	struct rm_priotracker tracker;

rm_rlock(&osdm[type].osd_object_lock, &tracker);
	do_osd_del(type, osd, slot, 0);
	rm_runlock(&osdm[type].osd_object_lock, &tracker);
}

static void
do_osd_del(u_int type, struct osd *osd, u_int slot, int list_locked)
{
	int i;

KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
	KASSERT(slot > 0, ("Invalid slot."));
	KASSERT(osdm[type].osd_destructors[slot - 1] != NULL, ("Unused slot."));

OSD_DEBUG("Deleting slot (type=%u, slot=%u).", type, slot);

if (slot > osd->osd_nslots) {
		OSD_DEBUG("Slot doesn't exist (type=%u, slot=%u).", type, slot);
		return;
	}
	if (osd->osd_slots[slot - 1] != NULL) {
		osdm[type].osd_destructors[slot - 1](osd->osd_slots[slot - 1]);
		osd->osd_slots[slot - 1] = NULL;
	}
	for (i = osd->osd_nslots - 1; i >= 0; i--) {
		if (osd->osd_slots[i] != NULL) {
			OSD_DEBUG("Slot still has a value (type=%u, slot=%u).",
			    type, i + 1);
			break;
		}
	}
	if (i == -1) {
		/* No values left for this object. */
		OSD_DEBUG("No more slots left (type=%u).", type);
		if (!list_locked)
			mtx_lock(&osdm[type].osd_list_lock);
		LIST_REMOVE(osd, osd_next);
		if (!list_locked)
			mtx_unlock(&osdm[type].osd_list_lock);
		free(osd->osd_slots, M_OSD);
		osd->osd_slots = NULL;
		osd->osd_nslots = 0;
	} else if (slot == osd->osd_nslots) {
		/* This was the last slot. */
		osd->osd_slots = realloc(osd->osd_slots,
		    sizeof(void *) * (i + 1), M_OSD, M_NOWAIT | M_ZERO);
		/*
		 * We always reallocate to smaller size, so we assume it will
		 * always succeed.
		 */
		KASSERT(osd->osd_slots != NULL, ("realloc() failed"));
		osd->osd_nslots = i + 1;
		OSD_DEBUG("Reducing slots array to %u (type=%u).",
		    osd->osd_nslots, type);
	}
}

int
osd_call(u_int type, u_int method, void *obj, void *data)
{
	osd_method_t methodfun;
	int error, i;

KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));
	KASSERT(method < osdm[type].osd_nmethods, ("Invalid method."));

/*
	 * Call this method for every slot that defines it, stopping if an
	 * error is encountered.
	 */
	error = 0;
	sx_slock(&osdm[type].osd_module_lock);
	for (i = 0; i < osdm[type].osd_ntslots; i++) {
		methodfun = osdm[type].osd_methods[i * osdm[type].osd_nmethods +
		    method];
		if (methodfun != NULL && (error = methodfun(obj, data)) != 0)
			break;
	}
	sx_sunlock(&osdm[type].osd_module_lock);
	return (error);
}

void
osd_exit(u_int type, struct osd *osd)
{
	struct rm_priotracker tracker;
	u_int i;

KASSERT(type >= OSD_FIRST && type <= OSD_LAST, ("Invalid type."));

if (osd->osd_nslots == 0) {
		KASSERT(osd->osd_slots == NULL, ("Non-null osd_slots."));
		/* No OSD attached, just leave. */
		return;
	}

rm_rlock(&osdm[type].osd_object_lock, &tracker);
	for (i = 1; i <= osd->osd_nslots; i++) {
		if (osdm[type].osd_destructors[i - 1] != NULL)
			do_osd_del(type, osd, i, 0);
		else
			OSD_DEBUG("Unused slot (type=%u, slot=%u).", type, i);
	}
	rm_runlock(&osdm[type].osd_object_lock, &tracker);
	OSD_DEBUG("Object exit (type=%u).", type);
}

static void
osd_init(void *arg __unused)
{
	u_int i;

for (i = OSD_FIRST; i <= OSD_LAST; i++) {
		sx_init(&osdm[i].osd_module_lock, "osd_module");
		rm_init(&osdm[i].osd_object_lock, "osd_object");
		mtx_init(&osdm[i].osd_list_lock, "osd_list", NULL, MTX_DEF);
		LIST_INIT(&osdm[i].osd_list);
		osdm[i].osd_destructors = NULL;
		osdm[i].osd_ntslots = 0;
		osdm[i].osd_methods = NULL;
	}
}
SYSINIT(osd, SI_SUB_LOCK, SI_ORDER_ANY, osd_init, NULL);

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