mirror_zfs/module/os/freebsd/zfs/sysctl_os.c

// SPDX-License-Identifier: BSD-2-Clause
/*
 * Copyright (c) 2020 iXsystems, Inc.
 * 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/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/uio.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/kmem.h>
#include <sys/conf.h>
#include <sys/cmn_err.h>
#include <sys/stat.h>
#include <sys/zfs_ioctl.h>
#include <sys/zfs_vfsops.h>
#include <sys/zfs_znode.h>
#include <sys/zap.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/vdev.h>
#include <sys/vdev_impl.h>
#include <sys/arc_os.h>
#include <sys/dmu.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_deleg.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_impl.h>
#include <sys/dmu_tx.h>
#include <sys/sunddi.h>
#include <sys/policy.h>
#include <sys/zone.h>
#include <sys/nvpair.h>
#include <sys/mount.h>
#include <sys/taskqueue.h>
#include <sys/sdt.h>
#include <sys/fs/zfs.h>
#include <sys/zfs_ctldir.h>
#include <sys/zfs_dir.h>
#include <sys/zfs_onexit.h>
#include <sys/zvol.h>
#include <sys/dsl_scan.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_send.h>
#include <sys/dsl_destroy.h>
#include <sys/dsl_bookmark.h>
#include <sys/dsl_userhold.h>
#include <sys/zfeature.h>
#include <sys/zcp.h>
#include <sys/zio_checksum.h>
#include <sys/vdev_removal.h>
#include <sys/dsl_crypt.h>

#include <sys/zfs_ioctl_compat.h>
#include <sys/zfs_context.h>

#include <sys/arc_impl.h>
#include <sys/dsl_pool.h>

#include <sys/vmmeter.h>

SYSCTL_DECL(_vfs_zfs);
SYSCTL_NODE(_vfs_zfs, OID_AUTO, arc, CTLFLAG_RW, 0,
	"ZFS adaptive replacement cache");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, brt, CTLFLAG_RW, 0,
	"ZFS Block Reference Table");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, condense, CTLFLAG_RW, 0, "ZFS condense");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, dbuf, CTLFLAG_RW, 0, "ZFS disk buf cache");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, dbuf_cache, CTLFLAG_RW, 0,
	"ZFS disk buf cache");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, deadman, CTLFLAG_RW, 0, "ZFS deadman");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, dedup, CTLFLAG_RW, 0, "ZFS dedup");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, l2arc, CTLFLAG_RW, 0, "ZFS l2arc");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, livelist, CTLFLAG_RW, 0, "ZFS livelist");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, lua, CTLFLAG_RW, 0, "ZFS lua");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, metaslab, CTLFLAG_RW, 0, "ZFS metaslab");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, mg, CTLFLAG_RW, 0, "ZFS metaslab group");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, multihost, CTLFLAG_RW, 0,
	"ZFS multihost protection");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, prefetch, CTLFLAG_RW, 0, "ZFS prefetch");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, reconstruct, CTLFLAG_RW, 0, "ZFS reconstruct");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, recv, CTLFLAG_RW, 0, "ZFS receive");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, send, CTLFLAG_RW, 0, "ZFS send");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, spa, CTLFLAG_RW, 0, "ZFS space allocation");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, trim, CTLFLAG_RW, 0, "ZFS TRIM");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, txg, CTLFLAG_RW, 0, "ZFS transaction group");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, vdev, CTLFLAG_RW, 0, "ZFS VDEV");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, vnops, CTLFLAG_RW, 0, "ZFS VNOPS");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, zevent, CTLFLAG_RW, 0, "ZFS event");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, zil, CTLFLAG_RW, 0, "ZFS ZIL");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, zio, CTLFLAG_RW, 0, "ZFS ZIO");

SYSCTL_NODE(_vfs_zfs_livelist, OID_AUTO, condense, CTLFLAG_RW, 0,
	"ZFS livelist condense");
SYSCTL_NODE(_vfs_zfs_vdev, OID_AUTO, file, CTLFLAG_RW, 0, "ZFS VDEV file");
SYSCTL_NODE(_vfs_zfs_vdev, OID_AUTO, mirror, CTLFLAG_RD, 0,
	"ZFS VDEV mirror");

SYSCTL_DECL(_vfs_zfs_version);
SYSCTL_CONST_STRING(_vfs_zfs_version, OID_AUTO, module, CTLFLAG_RD,
	(ZFS_META_VERSION "-" ZFS_META_RELEASE), "OpenZFS module version");

/* arc.c */

int
param_set_arc_u64(SYSCTL_HANDLER_ARGS)
{
	int err;

	err = sysctl_handle_64(oidp, arg1, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (err);

	arc_tuning_update(B_TRUE);

	return (0);
}

int
param_set_arc_int(SYSCTL_HANDLER_ARGS)
{
	int err;

	err = sysctl_handle_int(oidp, arg1, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (err);

	arc_tuning_update(B_TRUE);

	return (0);
}

int
param_set_l2arc_dwpd_limit(SYSCTL_HANDLER_ARGS)
{
	uint64_t old_val = l2arc_dwpd_limit;
	int err;

	err = sysctl_handle_64(oidp, arg1, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (err);

	if (l2arc_dwpd_limit != old_val)
		l2arc_dwpd_bump_reset();

	return (0);
}

int
param_set_arc_max(SYSCTL_HANDLER_ARGS)
{
	unsigned long val;
	int err;

	val = zfs_arc_max;
	err = sysctl_handle_64(oidp, &val, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (SET_ERROR(err));

	if (val != 0 && (val < MIN_ARC_MAX || val <= arc_c_min ||
	    val >= arc_all_memory()))
		return (SET_ERROR(EINVAL));

	zfs_arc_max = val;
	arc_tuning_update(B_TRUE);

	/* Update the sysctl to the tuned value */
	if (val != 0)
		zfs_arc_max = arc_c_max;

	return (0);
}

int
param_set_arc_min(SYSCTL_HANDLER_ARGS)
{
	unsigned long val;
	int err;

	val = zfs_arc_min;
	err = sysctl_handle_64(oidp, &val, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (SET_ERROR(err));

	if (val != 0 && (val < 2ULL << SPA_MAXBLOCKSHIFT || val > arc_c_max))
		return (SET_ERROR(EINVAL));

	zfs_arc_min = val;
	arc_tuning_update(B_TRUE);

	/* Update the sysctl to the tuned value */
	if (val != 0)
		zfs_arc_min = arc_c_min;

	return (0);
}

extern uint_t zfs_arc_free_target;

int
param_set_arc_free_target(SYSCTL_HANDLER_ARGS)
{
	uint_t val;
	int err;

	val = zfs_arc_free_target;
	err = sysctl_handle_int(oidp, &val, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (err);

	if (val < minfree)
		return (EINVAL);
	if (val > vm_cnt.v_page_count)
		return (EINVAL);

	zfs_arc_free_target = val;

	return (0);
}

int
param_set_arc_no_grow_shift(SYSCTL_HANDLER_ARGS)
{
	int err, val;

	val = arc_no_grow_shift;
	err = sysctl_handle_int(oidp, &val, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (err);

	if (val < 0 || val >= arc_shrink_shift)
		return (EINVAL);

	arc_no_grow_shift = val;

	return (0);
}

/* metaslab.c */

int
param_set_active_allocator(SYSCTL_HANDLER_ARGS)
{
	char buf[16];
	int rc;

	if (req->newptr == NULL)
		strlcpy(buf, zfs_active_allocator, sizeof (buf));

	rc = sysctl_handle_string(oidp, buf, sizeof (buf), req);
	if (rc || req->newptr == NULL)
		return (rc);
	if (strcmp(buf, zfs_active_allocator) == 0)
		return (0);

	return (param_set_active_allocator_common(buf));
}

/*
 * In pools where the log space map feature is not enabled we touch
 * multiple metaslabs (and their respective space maps) with each
 * transaction group. Thus, we benefit from having a small space map
 * block size since it allows us to issue more I/O operations scattered
 * around the disk. So a sane default for the space map block size
 * is 8~16K.
 */
extern int zfs_metaslab_sm_blksz_no_log;

SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, sm_blksz_no_log,
	CTLFLAG_RDTUN, &zfs_metaslab_sm_blksz_no_log, 0,
	"Block size for space map in pools with log space map disabled.  "
	"Power of 2 greater than 4096.");

/*
 * When the log space map feature is enabled, we accumulate a lot of
 * changes per metaslab that are flushed once in a while so we benefit
 * from a bigger block size like 128K for the metaslab space maps.
 */
extern int zfs_metaslab_sm_blksz_with_log;

SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, sm_blksz_with_log,
	CTLFLAG_RDTUN, &zfs_metaslab_sm_blksz_with_log, 0,
	"Block size for space map in pools with log space map enabled.  "
	"Power of 2 greater than 4096.");

/*
 * The in-core space map representation is more compact than its on-disk form.
 * The zfs_condense_pct determines how much more compact the in-core
 * space map representation must be before we compact it on-disk.
 * Values should be greater than or equal to 100.
 */
extern uint_t zfs_condense_pct;

SYSCTL_UINT(_vfs_zfs, OID_AUTO, condense_pct,
	CTLFLAG_RWTUN, &zfs_condense_pct, 0,
	"Condense on-disk spacemap when it is more than this many percents"
	" of in-memory counterpart");

/*
 * Minimum size which forces the dynamic allocator to change
 * it's allocation strategy.  Once the space map cannot satisfy
 * an allocation of this size then it switches to using more
 * aggressive strategy (i.e search by size rather than offset).
 */
extern uint64_t metaslab_df_alloc_threshold;

SYSCTL_QUAD(_vfs_zfs_metaslab, OID_AUTO, df_alloc_threshold,
	CTLFLAG_RWTUN, &metaslab_df_alloc_threshold, 0,
	"Minimum size which forces the dynamic allocator to change its"
	" allocation strategy");

/*
 * The minimum free space, in percent, which must be available
 * in a space map to continue allocations in a first-fit fashion.
 * Once the space map's free space drops below this level we dynamically
 * switch to using best-fit allocations.
 */
extern uint_t metaslab_df_free_pct;

SYSCTL_UINT(_vfs_zfs_metaslab, OID_AUTO, df_free_pct,
	CTLFLAG_RWTUN, &metaslab_df_free_pct, 0,
	"The minimum free space, in percent, which must be available in a"
	" space map to continue allocations in a first-fit fashion");

/* mmp.c */

int
param_set_multihost_interval(SYSCTL_HANDLER_ARGS)
{
	int err;

	err = sysctl_handle_64(oidp, &zfs_multihost_interval, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (err);

	if (spa_mode_global != SPA_MODE_UNINIT)
		mmp_signal_all_threads();

	return (0);
}

/* spa.c */

extern int zfs_ccw_retry_interval;

SYSCTL_INT(_vfs_zfs, OID_AUTO, ccw_retry_interval,
	CTLFLAG_RWTUN, &zfs_ccw_retry_interval, 0,
	"Configuration cache file write, retry after failure, interval"
	" (seconds)");

extern uint64_t zfs_max_missing_tvds_cachefile;

SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, max_missing_tvds_cachefile,
	CTLFLAG_RWTUN, &zfs_max_missing_tvds_cachefile, 0,
	"Allow importing pools with missing top-level vdevs in cache file");

extern uint64_t zfs_max_missing_tvds_scan;

SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, max_missing_tvds_scan,
	CTLFLAG_RWTUN, &zfs_max_missing_tvds_scan, 0,
	"Allow importing pools with missing top-level vdevs during scan");

/* spa_misc.c */

extern int zfs_flags;

static int
sysctl_vfs_zfs_debug_flags(SYSCTL_HANDLER_ARGS)
{
	int err, val;

	val = zfs_flags;
	err = sysctl_handle_int(oidp, &val, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (err);

	/*
	 * ZFS_DEBUG_MODIFY must be enabled prior to boot so all
	 * arc buffers in the system have the necessary additional
	 * checksum data.  However, it is safe to disable at any
	 * time.
	 */
	if (!(zfs_flags & ZFS_DEBUG_MODIFY))
		val &= ~ZFS_DEBUG_MODIFY;
	zfs_flags = val;

	return (0);
}

SYSCTL_PROC(_vfs_zfs, OID_AUTO, debugflags,
	CTLTYPE_UINT | CTLFLAG_MPSAFE | CTLFLAG_RWTUN, NULL, 0,
	sysctl_vfs_zfs_debug_flags, "IU", "Debug flags for ZFS testing.");

int
param_set_deadman_synctime(SYSCTL_HANDLER_ARGS)
{
	unsigned long val;
	int err;

	val = zfs_deadman_synctime_ms;
	err = sysctl_handle_64(oidp, &val, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (err);
	zfs_deadman_synctime_ms = val;

	spa_set_deadman_synctime(MSEC2NSEC(zfs_deadman_synctime_ms));

	return (0);
}

int
param_set_deadman_ziotime(SYSCTL_HANDLER_ARGS)
{
	unsigned long val;
	int err;

	val = zfs_deadman_ziotime_ms;
	err = sysctl_handle_64(oidp, &val, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (err);
	zfs_deadman_ziotime_ms = val;

	spa_set_deadman_ziotime(MSEC2NSEC(zfs_deadman_synctime_ms));

	return (0);
}

int
param_set_deadman_failmode(SYSCTL_HANDLER_ARGS)
{
	char buf[16];
	int rc;

	if (req->newptr == NULL)
		strlcpy(buf, zfs_deadman_failmode, sizeof (buf));

	rc = sysctl_handle_string(oidp, buf, sizeof (buf), req);
	if (rc || req->newptr == NULL)
		return (rc);
	if (strcmp(buf, zfs_deadman_failmode) == 0)
		return (0);
	if (strcmp(buf, "wait") == 0)
		zfs_deadman_failmode = "wait";
	if (strcmp(buf, "continue") == 0)
		zfs_deadman_failmode = "continue";
	if (strcmp(buf, "panic") == 0)
		zfs_deadman_failmode = "panic";

	return (-param_set_deadman_failmode_common(buf));
}

int
param_set_raidz_impl(SYSCTL_HANDLER_ARGS)
{
	const size_t bufsize = 128;
	char *buf;
	int rc;

	buf = malloc(bufsize, M_SOLARIS, M_WAITOK | M_ZERO);
	if (req->newptr == NULL)
		vdev_raidz_impl_get(buf, bufsize);

	rc = sysctl_handle_string(oidp, buf, bufsize, req);
	if (rc || req->newptr == NULL) {
		free(buf, M_SOLARIS);
		return (rc);
	}
	rc = vdev_raidz_impl_set(buf);
	free(buf, M_SOLARIS);
	return (rc);
}

int
param_set_slop_shift(SYSCTL_HANDLER_ARGS)
{
	int val;
	int err;

	val = spa_slop_shift;
	err = sysctl_handle_int(oidp, &val, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (err);

	if (val < 1 || val > 31)
		return (EINVAL);

	spa_slop_shift = val;

	return (0);
}

/* spacemap.c */

extern int space_map_ibs;

SYSCTL_INT(_vfs_zfs, OID_AUTO, space_map_ibs, CTLFLAG_RWTUN,
	&space_map_ibs, 0, "Space map indirect block shift");


/* vdev.c */

int
param_set_min_auto_ashift(SYSCTL_HANDLER_ARGS)
{
	int val;
	int err;

	val = zfs_vdev_min_auto_ashift;
	err = sysctl_handle_int(oidp, &val, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (SET_ERROR(err));

	if (val < ASHIFT_MIN || val > zfs_vdev_max_auto_ashift)
		return (SET_ERROR(EINVAL));

	zfs_vdev_min_auto_ashift = val;

	return (0);
}

int
param_set_max_auto_ashift(SYSCTL_HANDLER_ARGS)
{
	int val;
	int err;

	val = zfs_vdev_max_auto_ashift;
	err = sysctl_handle_int(oidp, &val, 0, req);
	if (err != 0 || req->newptr == NULL)
		return (SET_ERROR(err));

	if (val > ASHIFT_MAX || val < zfs_vdev_min_auto_ashift)
		return (SET_ERROR(EINVAL));

	zfs_vdev_max_auto_ashift = val;

	return (0);
}

/*
 * Since the DTL space map of a vdev is not expected to have a lot of
 * entries, we default its block size to 4K.
 */
extern int zfs_vdev_dtl_sm_blksz;

SYSCTL_INT(_vfs_zfs, OID_AUTO, dtl_sm_blksz,
	CTLFLAG_RDTUN, &zfs_vdev_dtl_sm_blksz, 0,
	"Block size for DTL space map.  Power of 2 greater than 4096.");

/*
 * vdev-wide space maps that have lots of entries written to them at
 * the end of each transaction can benefit from a higher I/O bandwidth
 * (e.g. vdev_obsolete_sm), thus we default their block size to 128K.
 */
extern int zfs_vdev_standard_sm_blksz;

SYSCTL_INT(_vfs_zfs, OID_AUTO, standard_sm_blksz,
	CTLFLAG_RDTUN, &zfs_vdev_standard_sm_blksz, 0,
	"Block size for standard space map.  Power of 2 greater than 4096.");

/* zio.c */

SYSCTL_INT(_vfs_zfs_zio, OID_AUTO, exclude_metadata,
	CTLFLAG_RDTUN, &zio_exclude_metadata, 0,
	"Exclude metadata buffers from dumps as well");