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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: vfs_init.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed
 * to Berkeley by John Heidemann of the UCLA Ficus project.
 *
 * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	@(#)vfs_init.c	8.3 (Berkeley) 1/4/94
 */

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

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fnv_hash.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/linker.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/sx.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <sys/malloc.h>

static int	vfs_register(struct vfsconf *);
static int	vfs_unregister(struct vfsconf *);

MALLOC_DEFINE(M_VNODE, "vnodes", "Dynamically allocated vnodes");

/*
 * The highest defined VFS number.
 */
int maxvfsconf = VFS_GENERIC + 1;

/*
 * Single-linked list of configured VFSes.
 * New entries are added/deleted by vfs_register()/vfs_unregister()
 */
struct vfsconfhead vfsconf = TAILQ_HEAD_INITIALIZER(vfsconf);
struct sx vfsconf_sx;
SX_SYSINIT(vfsconf, &vfsconf_sx, "vfsconf");

/*
 * Loader.conf variable vfs.typenumhash enables setting vfc_typenum using a hash
 * calculation on vfc_name, so that it doesn't change when file systems are
 * loaded in a different order. This will avoid the NFS server file handles from
 * changing for file systems that use vfc_typenum in their fsid.
 */
static int	vfs_typenumhash = 1;
SYSCTL_INT(_vfs, OID_AUTO, typenumhash, CTLFLAG_RDTUN, &vfs_typenumhash, 0,
    "Set vfc_typenum using a hash calculation on vfc_name, so that it does not"
    "change when file systems are loaded in a different order.");

/*
 * A Zen vnode attribute structure.
 *
 * Initialized when the first filesystem registers by vfs_register().
 */
struct vattr va_null;

/*
 * vfs_init.c
 *
 * Allocate and fill in operations vectors.
 *
 * An undocumented feature of this approach to defining operations is that
 * there can be multiple entries in vfs_opv_descs for the same operations
 * vector. This allows third parties to extend the set of operations
 * supported by another layer in a binary compatibile way. For example,
 * assume that NFS needed to be modified to support Ficus. NFS has an entry
 * (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by
 * default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions)
 * listing those new operations Ficus adds to NFS, all without modifying the
 * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but
 * that is a(whole)nother story.) This is a feature.
 */

/*
 * Routines having to do with the management of the vnode table.
 */

static struct vfsconf *
vfs_byname_locked(const char *name)
{
	struct vfsconf *vfsp;

sx_assert(&vfsconf_sx, SA_LOCKED);
	if (!strcmp(name, "ffs"))
		name = "ufs";
	TAILQ_FOREACH(vfsp, &vfsconf, vfc_list) {
		if (!strcmp(name, vfsp->vfc_name))
			return (vfsp);
	}
	return (NULL);
}

struct vfsconf *
vfs_byname(const char *name)
{
	struct vfsconf *vfsp;

vfsconf_slock();
	vfsp = vfs_byname_locked(name);
	vfsconf_sunlock();
	return (vfsp);
}

struct vfsconf *
vfs_byname_kld(const char *fstype, struct thread *td, int *error)
{
	struct vfsconf *vfsp;
	int fileid, loaded;

vfsp = vfs_byname(fstype);
	if (vfsp != NULL)
		return (vfsp);

/* Try to load the respective module. */
	*error = kern_kldload(td, fstype, &fileid);
	loaded = (*error == 0);
	if (*error == EEXIST)
		*error = 0;
	if (*error)
		return (NULL);

/* Look up again to see if the VFS was loaded. */
	vfsp = vfs_byname(fstype);
	if (vfsp == NULL) {
		if (loaded)
			(void)kern_kldunload(td, fileid, LINKER_UNLOAD_FORCE);
		*error = ENODEV;
		return (NULL);
	}
	return (vfsp);
}

static int
vfs_mount_sigdefer(struct mount *mp)
{
	int prev_stops, rc;

TSRAW(curthread, TS_ENTER, "VFS_MOUNT", mp->mnt_vfc->vfc_name);
	prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_mount)(mp);
	sigallowstop(prev_stops);
	TSRAW(curthread, TS_EXIT, "VFS_MOUNT", mp->mnt_vfc->vfc_name);
	return (rc);
}

static int
vfs_unmount_sigdefer(struct mount *mp, int mntflags)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_unmount)(mp, mntflags);
	sigallowstop(prev_stops);
	return (rc);
}

static int
vfs_root_sigdefer(struct mount *mp, int flags, struct vnode **vpp)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_root)(mp, flags, vpp);
	sigallowstop(prev_stops);
	return (rc);
}

static int
vfs_cachedroot_sigdefer(struct mount *mp, int flags, struct vnode **vpp)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_cachedroot)(mp, flags, vpp);
	sigallowstop(prev_stops);
	return (rc);
}

static int
vfs_quotactl_sigdefer(struct mount *mp, int cmd, uid_t uid, void *arg)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_quotactl)(mp, cmd, uid, arg);
	sigallowstop(prev_stops);
	return (rc);
}

static int
vfs_statfs_sigdefer(struct mount *mp, struct statfs *sbp)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_statfs)(mp, sbp);
	sigallowstop(prev_stops);
	return (rc);
}

static int
vfs_sync_sigdefer(struct mount *mp, int waitfor)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_sync)(mp, waitfor);
	sigallowstop(prev_stops);
	return (rc);
}

static int
vfs_vget_sigdefer(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_vget)(mp, ino, flags, vpp);
	sigallowstop(prev_stops);
	return (rc);
}

static int
vfs_fhtovp_sigdefer(struct mount *mp, struct fid *fidp, int flags,
    struct vnode **vpp)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_fhtovp)(mp, fidp, flags, vpp);
	sigallowstop(prev_stops);
	return (rc);
}

static int
vfs_checkexp_sigdefer(struct mount *mp, struct sockaddr *nam, uint64_t *exflg,
    struct ucred **credp, int *numsecflavors, int *secflavors)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_checkexp)(mp, nam, exflg, credp,
	    numsecflavors, secflavors);
	sigallowstop(prev_stops);
	return (rc);
}

static int
vfs_extattrctl_sigdefer(struct mount *mp, int cmd, struct vnode *filename_vp,
    int attrnamespace, const char *attrname)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_extattrctl)(mp, cmd,
	    filename_vp, attrnamespace, attrname);
	sigallowstop(prev_stops);
	return (rc);
}

static int
vfs_sysctl_sigdefer(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
{
	int prev_stops, rc;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_sysctl)(mp, op, req);
	sigallowstop(prev_stops);
	return (rc);
}

static void
vfs_susp_clean_sigdefer(struct mount *mp)
{
	int prev_stops;

if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_susp_clean == NULL)
		return;
	prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	(*mp->mnt_vfc->vfc_vfsops_sd->vfs_susp_clean)(mp);
	sigallowstop(prev_stops);
}

static void
vfs_reclaim_lowervp_sigdefer(struct mount *mp, struct vnode *vp)
{
	int prev_stops;

if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_reclaim_lowervp == NULL)
		return;
	prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	(*mp->mnt_vfc->vfc_vfsops_sd->vfs_reclaim_lowervp)(mp, vp);
	sigallowstop(prev_stops);
}

static void
vfs_unlink_lowervp_sigdefer(struct mount *mp, struct vnode *vp)
{
	int prev_stops;

if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_unlink_lowervp == NULL)
		return;
	prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	(*(mp)->mnt_vfc->vfc_vfsops_sd->vfs_unlink_lowervp)(mp, vp);
	sigallowstop(prev_stops);
}

static void
vfs_purge_sigdefer(struct mount *mp)
{
	int prev_stops;

prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
	(*mp->mnt_vfc->vfc_vfsops_sd->vfs_purge)(mp);
	sigallowstop(prev_stops);
}

static struct vfsops vfsops_sigdefer = {
	.vfs_mount =		vfs_mount_sigdefer,
	.vfs_unmount =		vfs_unmount_sigdefer,
	.vfs_root =		vfs_root_sigdefer,
	.vfs_cachedroot =	vfs_cachedroot_sigdefer,
	.vfs_quotactl =		vfs_quotactl_sigdefer,
	.vfs_statfs =		vfs_statfs_sigdefer,
	.vfs_sync =		vfs_sync_sigdefer,
	.vfs_vget =		vfs_vget_sigdefer,
	.vfs_fhtovp =		vfs_fhtovp_sigdefer,
	.vfs_checkexp =		vfs_checkexp_sigdefer,
	.vfs_extattrctl =	vfs_extattrctl_sigdefer,
	.vfs_sysctl =		vfs_sysctl_sigdefer,
	.vfs_susp_clean =	vfs_susp_clean_sigdefer,
	.vfs_reclaim_lowervp =	vfs_reclaim_lowervp_sigdefer,
	.vfs_unlink_lowervp =	vfs_unlink_lowervp_sigdefer,
	.vfs_purge =		vfs_purge_sigdefer,

};

/* Register a new filesystem type in the global table */
static int
vfs_register(struct vfsconf *vfc)
{
	struct sysctl_oid *oidp;
	struct vfsops *vfsops;
	static int once;
	struct vfsconf *tvfc;
	uint32_t hashval;
	int secondpass;

if (!once) {
		vattr_null(&va_null);
		once = 1;
	}

if (vfc->vfc_version != VFS_VERSION) {
		printf("ERROR: filesystem %s, unsupported ABI version %x\n",
		    vfc->vfc_name, vfc->vfc_version);
		return (EINVAL);
	}
	vfsconf_lock();
	if (vfs_byname_locked(vfc->vfc_name) != NULL) {
		vfsconf_unlock();
		return (EEXIST);
	}

if (vfs_typenumhash != 0) {
		/*
		 * Calculate a hash on vfc_name to use for vfc_typenum. Unless
		 * all of 1<->255 are assigned, it is limited to 8bits since
		 * that is what ZFS uses from vfc_typenum and is also the
		 * preferred range for vfs_getnewfsid().
		 */
		hashval = fnv_32_str(vfc->vfc_name, FNV1_32_INIT);
		hashval &= 0xff;
		secondpass = 0;
		do {
			/* Look for and fix any collision. */
			TAILQ_FOREACH(tvfc, &vfsconf, vfc_list) {
				if (hashval == tvfc->vfc_typenum) {
					if (hashval == 255 && secondpass == 0) {
						hashval = 1;
						secondpass = 1;
					} else
						hashval++;
					break;
				}
			}
		} while (tvfc != NULL);
		vfc->vfc_typenum = hashval;
		if (vfc->vfc_typenum >= maxvfsconf)
			maxvfsconf = vfc->vfc_typenum + 1;
	} else
		vfc->vfc_typenum = maxvfsconf++;
	TAILQ_INSERT_TAIL(&vfsconf, vfc, vfc_list);

/*
	 * Initialise unused ``struct vfsops'' fields, to use
	 * the vfs_std*() functions.  Note, we need the mount
	 * and unmount operations, at the least.  The check
	 * for vfsops available is just a debugging aid.
	 */
	KASSERT(vfc->vfc_vfsops != NULL,
	    ("Filesystem %s has no vfsops", vfc->vfc_name));
	/*
	 * Check the mount and unmount operations.
	 */
	vfsops = vfc->vfc_vfsops;
	KASSERT(vfsops->vfs_mount != NULL,
	    ("Filesystem %s has no mount op", vfc->vfc_name));
	KASSERT(vfsops->vfs_unmount != NULL,
	    ("Filesystem %s has no unmount op", vfc->vfc_name));

if (vfsops->vfs_root == NULL)
		/* return file system's root vnode */
		vfsops->vfs_root =	vfs_stdroot;
	if (vfsops->vfs_quotactl == NULL)
		/* quota control */
		vfsops->vfs_quotactl =	vfs_stdquotactl;
	if (vfsops->vfs_statfs == NULL)
		/* return file system's status */
		vfsops->vfs_statfs =	vfs_stdstatfs;
	if (vfsops->vfs_sync == NULL)
		/*
		 * flush unwritten data (nosync)
		 * file systems can use vfs_stdsync
		 * explicitly by setting it in the
		 * vfsop vector.
		 */
		vfsops->vfs_sync =	vfs_stdnosync;
	if (vfsops->vfs_vget == NULL)
		/* convert an inode number to a vnode */
		vfsops->vfs_vget =	vfs_stdvget;
	if (vfsops->vfs_fhtovp == NULL)
		/* turn an NFS file handle into a vnode */
		vfsops->vfs_fhtovp =	vfs_stdfhtovp;
	if (vfsops->vfs_checkexp == NULL)
		/* check if file system is exported */
		vfsops->vfs_checkexp =	vfs_stdcheckexp;
	if (vfsops->vfs_init == NULL)
		/* file system specific initialisation */
		vfsops->vfs_init =	vfs_stdinit;
	if (vfsops->vfs_uninit == NULL)
		/* file system specific uninitialisation */
		vfsops->vfs_uninit =	vfs_stduninit;
	if (vfsops->vfs_extattrctl == NULL)
		/* extended attribute control */
		vfsops->vfs_extattrctl = vfs_stdextattrctl;
	if (vfsops->vfs_sysctl == NULL)
		vfsops->vfs_sysctl = vfs_stdsysctl;

if ((vfc->vfc_flags & VFCF_SBDRY) != 0) {
		vfc->vfc_vfsops_sd = vfc->vfc_vfsops;
		vfc->vfc_vfsops = &vfsops_sigdefer;
	}

if (vfc->vfc_flags & VFCF_JAIL)
		prison_add_vfs(vfc);

/*
	 * Call init function for this VFS...
	 */
	if ((vfc->vfc_flags & VFCF_SBDRY) != 0)
		vfc->vfc_vfsops_sd->vfs_init(vfc);
	else
		vfc->vfc_vfsops->vfs_init(vfc);
	vfsconf_unlock();

/*
	 * If this filesystem has a sysctl node under vfs
	 * (i.e. vfs.xxfs), then change the oid number of that node to
	 * match the filesystem's type number.  This allows user code
	 * which uses the type number to read sysctl variables defined
	 * by the filesystem to continue working. Since the oids are
	 * in a sorted list, we need to make sure the order is
	 * preserved by re-registering the oid after modifying its
	 * number.
	 */
	sysctl_wlock();
	SLIST_FOREACH(oidp, SYSCTL_CHILDREN(&sysctl___vfs), oid_link) {
		if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
			sysctl_unregister_oid(oidp);
			oidp->oid_number = vfc->vfc_typenum;
			sysctl_register_oid(oidp);
			break;
		}
	}
	sysctl_wunlock();

return (0);
}

/* Remove registration of a filesystem type */
static int
vfs_unregister(struct vfsconf *vfc)
{
	struct vfsconf *vfsp;
	int error, maxtypenum;

vfsconf_lock();
	vfsp = vfs_byname_locked(vfc->vfc_name);
	if (vfsp == NULL) {
		vfsconf_unlock();
		return (EINVAL);
	}
	if (vfsp->vfc_refcount != 0) {
		vfsconf_unlock();
		return (EBUSY);
	}
	error = 0;
	if ((vfc->vfc_flags & VFCF_SBDRY) != 0) {
		if (vfc->vfc_vfsops_sd->vfs_uninit != NULL)
			error = vfc->vfc_vfsops_sd->vfs_uninit(vfsp);
	} else {
		if (vfc->vfc_vfsops->vfs_uninit != NULL) {
			error = vfc->vfc_vfsops->vfs_uninit(vfsp);
	}
	if (error != 0) {
		vfsconf_unlock();
		return (error);
	}
	}
	TAILQ_REMOVE(&vfsconf, vfsp, vfc_list);
	maxtypenum = VFS_GENERIC;
	TAILQ_FOREACH(vfsp, &vfsconf, vfc_list)
		if (maxtypenum < vfsp->vfc_typenum)
			maxtypenum = vfsp->vfc_typenum;
	maxvfsconf = maxtypenum + 1;
	vfsconf_unlock();
	return (0);
}

/*
 * Standard kernel module handling code for filesystem modules.
 * Referenced from VFS_SET().
 */
int
vfs_modevent(module_t mod, int type, void *data)
{
	struct vfsconf *vfc;
	int error = 0;

vfc = (struct vfsconf *)data;

switch (type) {
	case MOD_LOAD:
		if (vfc)
			error = vfs_register(vfc);
		break;

case MOD_UNLOAD:
		if (vfc)
			error = vfs_unregister(vfc);
		break;
	default:
		error = EOPNOTSUPP;
		break;
	}
	return (error);
}

003 File Manager

Editing: vfs_init.c

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