btrfs.c

/*
 * Copyright (c) 2016 Jeff Mahoney <jeffm@suse.com>
 * 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "defs.h"
#include <linux/fs.h>
#ifdef HAVE_LINUX_BTRFS_H
/*
 * Prior to Linux 3.12, the BTRFS_IOC_DEFAULT_SUBVOL used u64 in
 * its definition, which isn't exported by the kernel.
 */
typedef __u64 u64;

#include <linux/btrfs.h>

#ifndef HAVE_STRUCT_BTRFS_IOCTL_FEATURE_FLAGS_COMPAT_FLAGS
struct btrfs_ioctl_feature_flags {
	uint64_t compat_flags;
	uint64_t compat_ro_flags;
	uint64_t incompat_flags;
};
#endif

#ifndef HAVE_STRUCT_BTRFS_IOCTL_DEFRAG_RANGE_ARGS_START
struct btrfs_ioctl_defrag_range_args {
	uint64_t start;
	uint64_t len;
	uint64_t flags;
	uint32_t extent_thresh;
	uint32_t compress_type;
	uint32_t unused[4];
};
#endif

#ifndef BTRFS_SUBVOL_NAME_MAX
# define BTRFS_SUBVOL_NAME_MAX 4039
#endif

#ifndef BTRFS_LABEL_SIZE
# define BTRFS_LABEL_SIZE 256
#endif

#ifndef BTRFS_FIRST_FREE_OBJECTID
# define BTRFS_FIRST_FREE_OBJECTID 256ULL
#endif

#ifndef BTRFS_IOC_GET_FEATURES
# define BTRFS_IOC_GET_FEATURES _IOR(BTRFS_IOCTL_MAGIC, 57, \
					struct btrfs_ioctl_feature_flags)
# define BTRFS_IOC_SET_FEATURES _IOW(BTRFS_IOCTL_MAGIC, 57, \
					struct btrfs_ioctl_feature_flags[2])
# define BTRFS_IOC_GET_SUPPORTED_FEATURES _IOR(BTRFS_IOCTL_MAGIC, 57, \
					struct btrfs_ioctl_feature_flags[3])
#endif

#ifndef BTRFS_IOC_TREE_SEARCH_V2
# define BTRFS_IOC_TREE_SEARCH_V2 _IOWR(BTRFS_IOCTL_MAGIC, 17, \
					struct btrfs_ioctl_search_args_v2)
struct btrfs_ioctl_search_args_v2 {
	struct btrfs_ioctl_search_key key; /* in/out - search parameters */
	uint64_t buf_size;		   /* in - size of buffer
					    * out - on EOVERFLOW: needed size
					    *       to store item */
	uint64_t buf[0];		   /* out - found items */
};
#endif

#include "xlat/btrfs_balance_args.h"
#include "xlat/btrfs_balance_ctl_cmds.h"
#include "xlat/btrfs_balance_flags.h"
#include "xlat/btrfs_balance_state.h"
#include "xlat/btrfs_compress_types.h"
#include "xlat/btrfs_defrag_flags.h"
#include "xlat/btrfs_dev_replace_cmds.h"
#include "xlat/btrfs_dev_replace_results.h"
#include "xlat/btrfs_dev_replace_state.h"
#include "xlat/btrfs_dev_stats_flags.h"
#include "xlat/btrfs_dev_stats_values.h"
#include "xlat/btrfs_features_compat.h"
#include "xlat/btrfs_features_compat_ro.h"
#include "xlat/btrfs_features_incompat.h"
#include "xlat/btrfs_key_types.h"
#include "xlat/btrfs_qgroup_ctl_cmds.h"
#include "xlat/btrfs_qgroup_inherit_flags.h"
#include "xlat/btrfs_qgroup_limit_flags.h"
#include "xlat/btrfs_qgroup_status_flags.h"
#include "xlat/btrfs_scrub_flags.h"
#include "xlat/btrfs_send_flags.h"
#include "xlat/btrfs_snap_flags_v2.h"
#include "xlat/btrfs_space_info_flags.h"
#include "xlat/btrfs_tree_objectids.h"

static inline char
prnibble(char v)
{
	if (v >= 10)
		return 'a' + (v - 10);
	return '0' + v;
}

/* 8-4-4-4-12 = 36 characters */
#define UUID_STRING_SIZE 36

/* Formats uuid, returns 0 if it's all zeroes */
static int
btrfs_unparse_uuid(unsigned char *uuid, char *out)
{
	int i;
	int ret = 0;
	for (i = 0; i < BTRFS_UUID_SIZE; i++) {
		if (i == 4 || i == 6 || i == 8 || i == 10)
			*out++ = '-';
		*out++ = prnibble(uuid[i] >> 4);
		*out++ = prnibble(uuid[i] & 0xf);
		if (uuid[i])
			ret = 1;
	}
	*out = '\0';
	return ret;
}

static void
print_u64(const char *name, uint64_t value)
{
	tprintf(", %s=%" PRIu64, name, value);
	if (value == UINT64_MAX)
		tprints(" /* UINT64_MAX */");
}

#define print_member_u64(obj, name) print_u64(#name, obj->name)

static void
btrfs_print_balance_args(const char *name, struct btrfs_balance_args *bba)
{
	tprintf(", %s={profiles=", name);
	printflags64(btrfs_space_info_flags, bba->profiles,
		     "BTRFS_BLOCK_GROUP_???");
	print_member_u64(bba, usage);
	print_member_u64(bba, devid);
	print_member_u64(bba, pstart);
	print_member_u64(bba, pend);
	print_member_u64(bba, vstart);
	print_member_u64(bba, vend);
	print_member_u64(bba, target);
	tprints(", flags=");
	printflags64(btrfs_balance_args, bba->flags, "BTRFS_BALANCE_ARGS_???");
	tprints("}");
}

static void
btrfs_print_balance(struct tcb *tcp, const long arg, bool out)
{
	struct btrfs_ioctl_balance_args balance_args;

	if (umove_or_printaddr(tcp, arg, &balance_args))
		return;

	tprints("{flags=");
	printflags64(btrfs_balance_flags, balance_args.flags,
		     "BTRFS_BALANCE_???");
	if (out) {
		tprints(", state=");
		printflags64(btrfs_balance_state, balance_args.state,
			     "BTRFS_BALANCE_STATE_???");
	}

	if (balance_args.flags & BTRFS_BALANCE_DATA)
		btrfs_print_balance_args("data", &balance_args.data);
	if (balance_args.flags & BTRFS_BALANCE_METADATA)
		btrfs_print_balance_args("meta", &balance_args.meta);
	if (balance_args.flags & BTRFS_BALANCE_SYSTEM)
		btrfs_print_balance_args("sys", &balance_args.sys);
	tprints("}");
}

static void
btrfs_print_features(struct btrfs_ioctl_feature_flags *flags)
{
	tprints("{compat_flags=");
	printflags64(btrfs_features_compat, flags->compat_flags,
		     "BTRFS_FEATURE_COMPAT_???");

	tprints(", compat_ro_flags=");
	printflags64(btrfs_features_compat_ro, flags->compat_ro_flags,
		     "BTRFS_FEATURE_COMPAT_RO_???");

	tprints(", incompat_flags=");
	printflags64(btrfs_features_incompat, flags->incompat_flags,
		     "BTRFS_FEATURE_INCOMPAT_???");
	tprints("}");
}

static void
btrfs_print_qgroup_limit(struct btrfs_qgroup_limit *lim)
{
	tprints("{flags=");
	printflags64(btrfs_qgroup_limit_flags, lim->flags,
		     "BTRFS_QGROUP_LIMIT_???");
	tprintf(", max_rfer=%" PRI__u64 ", max_excl=%" PRI__u64
		", rsv_rfer=%" PRI__u64 ", rsv_excl=%" PRI__u64 "}",
		lim->max_rfer, lim->max_excl,
		lim->rsv_rfer, lim->rsv_excl);
}

static void
btrfs_print_key_type(uint32_t type)
{
	const char *str = xlookup(btrfs_key_types, type);
	tprintf("%u", type);
	if (str)
		tprintf(" /* %s */", str);
}

static void
btrfs_print_objectid(uint64_t objectid)
{
	const char *str = xlookup(btrfs_tree_objectids, objectid);
	tprintf("%" PRIu64, objectid);
	if (str)
		tprintf(" /* %s */", str);
}

static void
btrfs_print_data_container_header(struct btrfs_data_container *container)
{
	tprintf("{bytes_left=%u, bytes_missing=%u"
		", elem_cnt=%u, elem_missed=%u, val=",
		container->bytes_left, container->bytes_missing,
		container->elem_cnt, container->elem_missed);
}

static void
btrfs_print_data_container_footer(void)
{
	tprints("}");
}

static uint64_t
data_container_record_offset(unsigned int index)
{
	return offsetof(struct btrfs_data_container, val[index]);
}

static void
btrfs_print_logical_ino_container(struct tcb *tcp, uint64_t inodes_addr)
{
	struct btrfs_data_container container;
	uint32_t i;
	uint32_t printed = 0;

	if (umove_or_printaddr(tcp, inodes_addr, &container))
		return;

	btrfs_print_data_container_header(&container);
	if (abbrev(tcp)) {
		tprints("...");
		btrfs_print_data_container_footer();
		return;
	}

	tprints("[");

	for (i = 0; i < container.elem_cnt; i += 3, printed++) {
		uint64_t offset = data_container_record_offset(i);
		uint64_t record[3];

		if (i)
			tprints(", ");

		if (printed > max_strlen ||
		    umove(tcp, inodes_addr + offset, &record)) {
			tprints("...");
			break;
		}
		tprintf("{inum=%" PRIu64 ", offset=%" PRIu64
			", root=%" PRIu64 "}", record[0], record[1], record[2]);
	}
	tprints("]");
	btrfs_print_data_container_footer();
}

static void
btrfs_print_ino_path_container(struct tcb *tcp, uint64_t fspath_addr)
{
	struct btrfs_data_container container;
	uint32_t i;

	if (umove_or_printaddr(tcp, fspath_addr, &container))
		return;

	btrfs_print_data_container_header(&container);
	if (abbrev(tcp)) {
		tprints("...");
		btrfs_print_data_container_footer();
		return;
	}

	tprints("[");

	for (i = 0; i < container.elem_cnt; i++) {
		uint64_t offset = data_container_record_offset(i);
		uint64_t ptr;

		if (i)
			tprints(", ");

		if (i > max_strlen ||
		    umove(tcp, fspath_addr + offset, &ptr)) {
			tprints("...");
			break;
		}

		printpath(tcp,
			  fspath_addr + data_container_record_offset(0) + ptr);
	}
	tprints("]");
	btrfs_print_data_container_footer();
}

static void
btrfs_print_qgroup_inherit(struct tcb *tcp, uint64_t qgi_addr)
{
	struct btrfs_qgroup_inherit inherit;

	if (umove_or_printaddr(tcp, qgi_addr, &inherit))
		return;

	tprintf("{flags=");
	printflags64(btrfs_qgroup_inherit_flags, inherit.flags,
		     "BTRFS_QGROUP_INHERIT_???");
	tprintf(", num_qgroups=%" PRI__u64 ", num_ref_copies=%" PRI__u64
		", num_excl_copies=%" PRI__u64 ", lim=",
		inherit.num_qgroups, inherit.num_ref_copies,
		inherit.num_excl_copies);

	btrfs_print_qgroup_limit(&inherit.lim);

	tprints(", qgroups=");

	if (abbrev(tcp)) {
		tprints("...");
	} else {
		uint32_t i;

		tprints("[");
		for (i = 0; i < inherit.num_qgroups; i++) {
			uint64_t offset = offsetof(typeof(inherit), qgroups[i]);
			uint64_t record;
			if (i)
				tprints(", ");
			if (i > max_strlen ||
			    umove(tcp, qgi_addr + offset, &record)) {
				tprints("...");
				break;
			}

			tprintf("%" PRIu64, record);
		}
		tprints("]");
	}
	tprints("}");
}

static void
print_key_value_internal(struct tcb *tcp, const char *name, uint64_t value)
{
	if (value) {
		tprintf(", %s=%" PRIu64, name, value);
		if (value == UINT64_MAX)
			tprints(" /* UINT64_MAX */");
	}
}
#define print_key_value(tcp, key, name)					\
	print_key_value_internal((tcp), #name, (key)->name)

static void
btrfs_print_tree_search(struct tcb *tcp, struct btrfs_ioctl_search_key *key,
			uint64_t buf_addr, uint64_t buf_size, bool print_size)
{
	if (entering(tcp)) {
		tprintf("{key={tree_id=");
		btrfs_print_objectid(key->tree_id);

		if (key->min_objectid != BTRFS_FIRST_FREE_OBJECTID ||
		    !abbrev(tcp)) {
			tprints(", min_objectid=");
			btrfs_print_objectid(key->min_objectid);
		}

		if (key->max_objectid != BTRFS_LAST_FREE_OBJECTID ||
		    !abbrev(tcp)) {
			tprints(", max_objectid=");
			btrfs_print_objectid(key->max_objectid);
		}

		print_key_value(tcp, key, min_offset);
		print_key_value(tcp, key, max_offset);
		print_key_value(tcp, key, min_transid);
		print_key_value(tcp, key, max_transid);

		tprints(", min_type=");
		btrfs_print_key_type(key->min_type);
		tprints(", max_type=");
		btrfs_print_key_type(key->max_type);
		tprintf(", nr_items=%u}", key->nr_items);
		if (print_size)
			tprintf(", buf_size=%" PRIu64, buf_size);
		tprints("}");
		return;
	}
	tprintf("{key={nr_items=%u}", key->nr_items);
	if (print_size)
		tprintf(", buf_size=%" PRIu64, buf_size);
	tprints(", buf=");
	if (abbrev(tcp))
		tprints("...");
	else {
		uint64_t i;
		uint64_t off = 0;
		tprints("[");
		for (i = 0; i < key->nr_items; i++) {
			struct btrfs_ioctl_search_header sh;
			uint64_t addr = buf_addr + off;
			if (i)
				tprints(", ");
			if (i > max_strlen ||
			    umove(tcp, addr, &sh)) {
				tprints("...");
				break;
			}
			tprintf("{transid=%" PRI__u64 ", objectid=",
				sh.transid);
			btrfs_print_objectid(sh.objectid);
			tprintf(", offset=%" PRI__u64 ", type=", sh.offset);
			btrfs_print_key_type(sh.type);
			tprintf(", len=%u}", sh.len);
			off += sizeof(sh) + sh.len;
		}
		tprints("]");
	}

	tprints("}");
}

int
btrfs_ioctl(struct tcb *tcp, const unsigned int code, const long arg)
{
	switch (code) {
	/* Take no arguments; command only. */
	case BTRFS_IOC_TRANS_START:
	case BTRFS_IOC_TRANS_END:
	case BTRFS_IOC_SYNC:
	case BTRFS_IOC_SCRUB_CANCEL:
	case BTRFS_IOC_QUOTA_RESCAN_WAIT:
	/*
	 * The codes for these ioctls are based on each accepting a
	 * vol_args but none of them actually consume an argument.
	 */
	case BTRFS_IOC_DEFRAG:
	case BTRFS_IOC_BALANCE:
		break;

	/* takes a signed int */
	case BTRFS_IOC_BALANCE_CTL:
		tprints(", ");
		printxval(btrfs_balance_ctl_cmds, arg, "BTRFS_BALANCE_CTL_???");
		break;

	/* returns a 64 */
	case BTRFS_IOC_START_SYNC: /* R */
		if (entering(tcp))
			return 0;
	/* fall through */
	/* takes a u64 */
	case BTRFS_IOC_DEFAULT_SUBVOL: /* W */
	case BTRFS_IOC_WAIT_SYNC: /* W */
		tprints(", ");
		printnum_int64(tcp, arg, "%" PRIu64);
		break;

	/* u64 but describe a flags bitfield; we can make that symbolic */
	case BTRFS_IOC_SUBVOL_GETFLAGS: { /* R */
		uint64_t flags;

		if (entering(tcp))
			return 0;

		tprints(", ");

		if (umove_or_printaddr(tcp, arg, &flags))
			break;

		printflags64(btrfs_snap_flags_v2, flags, "BTRFS_SUBVOL_???");
		break;
	}

	case BTRFS_IOC_SUBVOL_SETFLAGS: { /* W */
		uint64_t flags;

		tprints(", ");

		if (umove_or_printaddr(tcp, arg, &flags))
			break;

		printflags64(btrfs_snap_flags_v2, flags, "BTRFS_SUBVOL_???");
		break;
	}

	/* More complex types */
	case BTRFS_IOC_BALANCE_V2: /* RW */
		if (entering(tcp)) {
			tprints(", ");
			btrfs_print_balance(tcp, arg, false);
			return 0;
		}

		if (syserror(tcp))
			break;

		tprints(" => ");
		btrfs_print_balance(tcp, arg, true);
		break;
	case BTRFS_IOC_BALANCE_PROGRESS: /* R */
		if (entering(tcp))
			return 0;

		tprints(", ");
		btrfs_print_balance(tcp, arg, true);
		break;

	case BTRFS_IOC_DEFRAG_RANGE: { /* W */
		struct btrfs_ioctl_defrag_range_args args;

		tprints(", ");

		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprintf("{start=%" PRIu64 ", len=", (uint64_t)args.start);

		tprintf("%" PRIu64, args.len);
		if (args.len == UINT64_MAX)
			tprints(" /* UINT64_MAX */");

		tprints(", flags=");
		printflags64(btrfs_defrag_flags, args.flags,
			     "BTRFS_DEFRAG_RANGE_???");
		tprintf(", extent_thresh=%u, compress_type=",
			args.extent_thresh);
		printxval(btrfs_compress_types, args.compress_type,
			  "BTRFS_COMPRESS_???");
		tprints("}");
		break;
	}

	case BTRFS_IOC_DEV_INFO: { /* RW */
		struct btrfs_ioctl_dev_info_args args;
		char uuid[UUID_STRING_SIZE+1];
		int valid;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;
		tprints("{");

		valid = btrfs_unparse_uuid(args.uuid, uuid);
		if (entering(tcp)) {
			tprintf("devid=%" PRI__u64, args.devid);
			if (valid)
				tprintf(", uuid=%s", uuid);
			tprints("}");
			return 0;
		}
		if (valid)
			tprintf("uuid=%s, ", uuid);
		tprintf("bytes_used=%" PRI__u64
			", total_bytes=%" PRI__u64 ", path=",
			args.bytes_used, args.total_bytes);
		print_quoted_string((const char *)args.path, sizeof(args.path),
				    QUOTE_0_TERMINATED);
		tprints("}");
		break;
	}

	case BTRFS_IOC_DEV_REPLACE: { /* RW */
		struct btrfs_ioctl_dev_replace_args args;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");

		if (umove_or_printaddr(tcp, arg, &args))
			break;

		if (entering(tcp)) {
			tprints("{cmd=");
			printxval64(btrfs_dev_replace_cmds, args.cmd,
				    "BTRFS_IOCTL_DEV_REPLACE_CMD_???");
			if (args.cmd == BTRFS_IOCTL_DEV_REPLACE_CMD_START) {
				const char *str;
				tprintf(", start={srcdevid=%" PRI__u64
				   ", cont_reading_from_srcdev_mode=%" PRI__u64
				   ", srcdev_name=",
				   args.start.srcdevid,
				   args.start.cont_reading_from_srcdev_mode);

				str = (const char*) args.start.srcdev_name;
				print_quoted_string(str,
						sizeof(args.start.srcdev_name),
						QUOTE_0_TERMINATED);
				tprints(", tgtdev_name=");
				str = (const char*) args.start.tgtdev_name;
				print_quoted_string(str,
						sizeof(args.start.tgtdev_name),
						QUOTE_0_TERMINATED);
				tprints("}");

			}
			tprints("}");
			return 0;
		}

		tprints("{result=");
		printxval64(btrfs_dev_replace_results, args.result,
			    "BTRFS_IOCTL_DEV_REPLACE_RESULT_???");
		if (args.cmd == BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS) {
			char buf[sizeof("HH:MM:SS") + 1];
			time_t time;
			tprints(", ");
			printxval64(btrfs_dev_replace_state,
				   args.status.replace_state,
				   "BTRFS_IOCTL_DEV_REPLACE_STATE_???");
			tprintf(", progress_1000=%" PRI__u64 " /* ",
				args.status.progress_1000);
			if (args.status.progress_1000 <= 1000)
				tprintf("%" PRI__u64 ".%.2" PRI__u64 "%%",
					args.status.progress_1000 / 10,
					args.status.progress_1000 % 10);
			else
				tprints("???");
			tprints(" */ ,");

			time = args.status.time_started;
			strftime(buf, sizeof(buf), "%T",
				 localtime(&time));
			tprintf("time_started=%" PRI__u64" /* %s */, ",
				args.status.time_started, buf);

			time = args.status.time_stopped;
			strftime(buf, sizeof(buf), "%T",
				 localtime(&time));
			tprintf("time_stopped=%" PRI__u64" /* %s */, ",
				args.status.time_stopped, buf);

			tprintf("num_write_errors=%" PRI__u64
				", num_uncorrectable_read_errors=%" PRI__u64,
				args.status.num_write_errors,
				args.status.num_uncorrectable_read_errors);
		}
		tprints("}");
		break;
	}

	case BTRFS_IOC_GET_FEATURES: { /* R */
		struct btrfs_ioctl_feature_flags flags;

		if (entering(tcp))
			return 0;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &flags))
			break;

		btrfs_print_features(&flags);
		break;
	}

	case BTRFS_IOC_SET_FEATURES: { /* W */
		struct btrfs_ioctl_feature_flags flarg[2];

		tprints(", ");

		if (umove_or_printaddr(tcp, arg, &flarg))
			break;

		tprints("[");
		btrfs_print_features(&flarg[0]);
		tprints(", ");
		btrfs_print_features(&flarg[1]);
		tprints("]");
		break;
	}

	case BTRFS_IOC_GET_SUPPORTED_FEATURES: { /* R */
		struct btrfs_ioctl_feature_flags flarg[3];

		if (entering(tcp))
			return 0;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &flarg))
			break;

		tprints("[ /* supported */ ");
		btrfs_print_features(&flarg[0]);

		tprints(", /* safe to set */ ");
		btrfs_print_features(&flarg[1]);

		tprints(", /* safe to clear */ ");
		btrfs_print_features(&flarg[2]);
		tprints("]");

		break;
	}

	case BTRFS_IOC_FS_INFO: { /* R */
		struct btrfs_ioctl_fs_info_args args;
		char uuid[UUID_STRING_SIZE+1];
		uint32_t nodesize, sectorsize, clone_alignment;
#ifndef HAVE_STRUCT_BTRFS_IOCTL_FS_INFO_ARGS_NODESIZE
		__u32 *reserved32;
#endif

		if (entering(tcp))
			return 0;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;

#ifdef HAVE_STRUCT_BTRFS_IOCTL_FS_INFO_ARGS_NODESIZE
		nodesize = args.nodesize,
		sectorsize = args.sectorsize,
		clone_alignment = args.clone_alignment;
#else
		reserved32 = (__u32 *)args.reserved;
		nodesize = reserved32[0];
		sectorsize = reserved32[1];
		clone_alignment = reserved32[2];
#endif
		btrfs_unparse_uuid(args.fsid, uuid);

		tprints("{");
		tprintf("max_id=%" PRI__u64 ", num_devices=%" PRI__u64
			", fsid=%s, nodesize=%u, sectorsize=%u"
			", clone_alignment=%u",
			args.max_id, args.num_devices, uuid,
			nodesize, sectorsize, clone_alignment);
		tprints("}");
		break;
	}

	case BTRFS_IOC_GET_DEV_STATS: { /* RW */
		struct btrfs_ioctl_get_dev_stats args;
		uint64_t i, max_nr_items;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprints("{");

		if (entering(tcp))
			tprintf("devid=%" PRI__u64 ", ", args.devid);

		tprintf("nr_items=%" PRI__u64 ", flags=", args.nr_items);
		printflags64(btrfs_dev_stats_flags, args.flags,
			     "BTRFS_DEV_STATS_???");

		if (entering(tcp)) {
			tprints("}");
			return 0;
		}

		/*
		 * The structure has a 1k limit; Let's make sure we don't
		 * go off into the middle of nowhere with a bad nr_items
		 * value.
		 */
		max_nr_items = sizeof(args) - offsetof(typeof(args), values);

		tprints(", [");
		for (i = 0; i < args.nr_items; i++) {
			const char *name = xlookup(btrfs_dev_stats_values, i);
			if (i)
				tprints(", ");
			if (i > max_nr_items) {
				tprints("/* overflow */");
				break;
			}
			if (name)
				tprintf("/* %s */ ", name);
			tprintf("%" PRI__u64, args.values[i]);
		}
		tprints("]}");
		break;
	}

	case BTRFS_IOC_INO_LOOKUP: { /* RW */
		struct btrfs_ioctl_ino_lookup_args args;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");

		if (umove_or_printaddr(tcp, arg, &args))
			break;

		if (entering(tcp)) {
			/* Use subvolume id of the containing root */
			if (args.treeid == 0)
				/* abuse of auxstr to retain state */
				tcp->auxstr = (void *)1;
			else
				tcp->auxstr = NULL;

			tprints("{treeid=");
			btrfs_print_objectid(args.treeid);
			tprints(", objectid=");
			btrfs_print_objectid(args.objectid);
			tprints("}");
			return 0;
		}

		tprints("{");
		if (tcp->auxstr) {
			tprints("treeid=");
			btrfs_print_objectid(args.treeid);
			tprints(", ");
		}
		tcp->auxstr = NULL;

		tprints("name=");
		print_quoted_string(args.name, sizeof(args.name),
				    QUOTE_0_TERMINATED);
		tprints("}");
		break;
	}

	case BTRFS_IOC_INO_PATHS: { /* RW */
		struct btrfs_ioctl_ino_path_args args;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");

		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprints("{");

		if (entering(tcp)) {
			tprintf("inum=%" PRI__u64 ", size=%" PRI__u64,
				args.inum, args.size);
			tprintf(", fspath=0x%" PRI__x64 "}", args.fspath);
			return 0;
		}

		tprints("fspath=");
		btrfs_print_ino_path_container(tcp, args.fspath);

		tprints("}");
		break;
	}

	case BTRFS_IOC_LOGICAL_INO: { /* RW */
		struct btrfs_ioctl_logical_ino_args args;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");

		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprints("{");

		if (entering(tcp)) {
			tprintf("logical=%" PRI__u64 ", size=%" PRI__u64,
				args.logical, args.size);
			tprintf(", inodes=0x%" PRI__x64 "}", args.inodes);
			return 0;
		}

		tprints("inodes=");
		btrfs_print_logical_ino_container(tcp, args.inodes);

		tprints("}");
		break;
	}

	case BTRFS_IOC_QGROUP_ASSIGN: { /* W */
		struct btrfs_ioctl_qgroup_assign_args args;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprintf("{assign=%" PRI__u64 ", src=%" PRI__u64
			", dst=%" PRI__u64 "}",
			args.assign, args.src, args.dst);
		break;
	}

	case BTRFS_IOC_QGROUP_CREATE: { /* W */
		struct btrfs_ioctl_qgroup_create_args args;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprintf("{create=%" PRI__u64 ", qgroupid=%" PRI__u64 "}",
			args.create, args.qgroupid);
		break;
	}

	case BTRFS_IOC_QGROUP_LIMIT: { /* R */
		struct btrfs_ioctl_qgroup_limit_args args;

		if (entering(tcp))
			return 0;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprintf("{qgroupid=%" PRI__u64 ", lim=", args.qgroupid);
		btrfs_print_qgroup_limit(&args.lim);
		tprints("}");
		break;
	}

	case BTRFS_IOC_QUOTA_CTL: { /* W */
		struct btrfs_ioctl_quota_ctl_args args;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;

		printxval64(btrfs_qgroup_ctl_cmds, args.cmd,
			    "BTRFS_QUOTA_CTL_???");
		tprints("}");

		break;
	}

	case BTRFS_IOC_QUOTA_RESCAN: { /* W */
		struct btrfs_ioctl_quota_rescan_args args;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprintf("{flags=%" PRI__u64 "}", args.flags);
		break;
	}

	case BTRFS_IOC_QUOTA_RESCAN_STATUS: { /* R */
		struct btrfs_ioctl_quota_rescan_args args;

		if (entering(tcp))
			return 0;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprintf("{flags=%" PRI__u64 ", progress=", args.flags);
		btrfs_print_objectid(args.progress);
		tprints("}");
		break;
	}

	case BTRFS_IOC_SET_RECEIVED_SUBVOL: { /* RW */
#ifdef BTRFS_IOC_SET_RECEIVED_SUBVOL_32
	case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: { /* RW */
		struct btrfs_ioctl_received_subvol_args_32 args32;
#endif
		struct btrfs_ioctl_received_subvol_args args;
		char uuid[UUID_STRING_SIZE+1];

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");

#ifdef BTRFS_IOC_SET_RECEIVED_SUBVOL_32
		/*
		 * This is a compat ioctl for 32 bit tools on
		 * 64 bit systems.
		 */
		if (code == BTRFS_IOC_SET_RECEIVED_SUBVOL_32) {
			if (umove_or_printaddr(tcp, arg, &args32))
				break;
			memcpy(args.uuid, args32.uuid, sizeof(uuid));
			args.stransid = args32.stransid;
			args.rtransid = args32.rtransid;
			args.stime.sec = args32.stime.sec;
			args.stime.nsec = args32.stime.nsec;
			args.rtime.sec = args32.rtime.sec;
			args.rtime.nsec = args32.rtime.nsec;
			args.flags = args32.flags;
		} else
#endif
		if (umove_or_printaddr(tcp, arg, &args))
			break;

		if (entering(tcp)) {
			btrfs_unparse_uuid((unsigned char *)args.uuid, uuid);
			tprintf("{uuid=%s, stransid=%" PRI__u64
				", stime=%" PRI__u64 ".%u, flags=%" PRI__u64
				"}", uuid, args.stransid, args.stime.sec,
				args.stime.nsec, args.flags);
			return 0;
		}
		tprintf("{rtransid=%" PRI__u64 ", rtime=%" PRI__u64 ".%u}",
			args.rtransid, args.rtime.sec, args.rtime.nsec);
		break;
	}

	case BTRFS_IOC_SCRUB: /* RW */
	case BTRFS_IOC_SCRUB_PROGRESS: { /* RW */
		struct btrfs_ioctl_scrub_args args;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");

		if (umove_or_printaddr(tcp, arg, &args))
			break;

		if (entering(tcp)) {
			tprintf("{devid=%" PRI__u64, args.devid);
			if (code == BTRFS_IOC_SCRUB) {
				tprintf(", start=%" PRI__u64 ", end=",
					args.start);
				tprintf("%" PRI__u64, args.end);
				if (args.end == UINT64_MAX)
					tprints(" /* UINT64_MAX */");
				tprints(", flags=");
				printflags64(btrfs_scrub_flags, args.flags,
					     "BTRFS_SCRUB_???");
			}
			tprints("}");
			return 0;
		}
		tprintf("{data_extents_scrubbed=%" PRI__u64
			", tree_extents_scrubbed=%" PRI__u64
			", data_bytes_scrubbed=%" PRI__u64
			", tree_bytes_scrubbed=%" PRI__u64
			", read_errors=%" PRI__u64
			", csum_errors=%" PRI__u64
			", verify_errors=%" PRI__u64
			", no_csum=%" PRI__u64
			", csum_discards=%" PRI__u64
			", super_errors=%" PRI__u64
			", malloc_errors=%" PRI__u64
			", uncorrectable_errors=%" PRI__u64
			", corrected_errors=%" PRI__u64
			", last_physical=%" PRI__u64
			", unverified_errors=%" PRI__u64 "}",
			args.progress.data_extents_scrubbed,
			args.progress.tree_extents_scrubbed,
			args.progress.data_bytes_scrubbed,
			args.progress.tree_bytes_scrubbed,
			args.progress.read_errors,
			args.progress.csum_errors,
			args.progress.verify_errors,
			args.progress.no_csum,
			args.progress.csum_discards,
			args.progress.super_errors,
			args.progress.malloc_errors,
			args.progress.uncorrectable_errors,
			args.progress.corrected_errors,
			args.progress.last_physical,
			args.progress.unverified_errors);
		break;
	}

	case BTRFS_IOC_TREE_SEARCH: { /* RW */
		struct btrfs_ioctl_search_args args;
		uint64_t buf_offset;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");

		if (umove_or_printaddr(tcp, arg, &args))
			break;

		buf_offset = offsetof(struct btrfs_ioctl_search_args, buf);
		btrfs_print_tree_search(tcp, &args.key, arg + buf_offset,
					sizeof(args.buf), false);
		if (entering(tcp))
			return 0;
		break;
	}

	case BTRFS_IOC_TREE_SEARCH_V2: { /* RW */
		struct btrfs_ioctl_search_args_v2 args;
		uint64_t buf_offset;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp)) {
			if (tcp->u_error == EOVERFLOW) {
				tcp->u_error = 0;
				if (!umove_or_printaddr(tcp, arg, &args))
					tprintf(" => {buf_size=%" PRIu64 "}",
						(uint64_t)args.buf_size);
				tcp->u_error = EOVERFLOW;
			}
			break;
		} else
			tprints(" => ");

		if (umove_or_printaddr(tcp, arg, &args))
			break;

		buf_offset = offsetof(struct btrfs_ioctl_search_args_v2, buf);
		btrfs_print_tree_search(tcp, &args.key, arg + buf_offset,
					args.buf_size, true);
		if (entering(tcp))
			return 0;
		break;
	}

	case BTRFS_IOC_SEND: { /* W */
		struct btrfs_ioctl_send_args args;
		uint64_t base_addr;
		uint64_t i;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprintf("{send_fd=%" PRI__d64 ", clone_sources_count=%" PRI__u64
			", clone_sources=", args.send_fd,
			args.clone_sources_count);

		if (abbrev(tcp)) {
			tprints("...");
		} else {
			tprints("[");
			base_addr = (unsigned long)args.clone_sources;
			for (i = 0; i < args.clone_sources_count; i++) {
				uint64_t offset = sizeof(uint64_t) * i;
				uint64_t record;
				if (i)
					tprints(", ");
				if (i > max_strlen ||
				    umove(tcp, base_addr + offset, &record)) {
					tprints("...");
					break;
				}
				btrfs_print_objectid(record);
			}
			tprints("]");
		}
		tprints(", parent_root=");
		btrfs_print_objectid(args.parent_root);
		tprints(", flags=");
		printflags64(btrfs_send_flags, args.flags,
			     "BTRFS_SEND_FLAGS_???");
		tprints("}");
		break;
	}

	case BTRFS_IOC_SPACE_INFO: { /* RW */
		struct btrfs_ioctl_space_args args;
		uint64_t i;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");

		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprints("{");
		if (entering(tcp)) {
			tprintf("space_slots=%" PRI__u64 "}", args.space_slots);
			return 0;
		}

		tprintf("total_spaces=%" PRI__u64, args.total_spaces);

		if (args.space_slots == 0 && args.total_spaces) {
			tprints("}");
			break;
		}

		tprints(", spaces=");

		if (abbrev(tcp)) {
			tprints("...}");
			break;
		}

		tprints("[");

		for (i = 0; i < args.total_spaces; i++) {
			struct btrfs_ioctl_space_info info;
			uint64_t off = offsetof(typeof(args), spaces[i]);
			if (i)
				tprints(", ");

			if (i > max_strlen ||
			    umove(tcp, arg + off, &info)) {
				tprints("...");
				break;
			}

			tprints("{flags=");
			printflags64(btrfs_space_info_flags, info.flags,
				     "BTRFS_SPACE_INFO_???");
			tprintf(", total_bytes=%" PRI__u64
			        ", used_bytes=%" PRI__u64 "}",
				info.total_bytes, info.used_bytes);
		}
		tprints("]}");
		break;
	}

	case BTRFS_IOC_SNAP_CREATE:
	case BTRFS_IOC_RESIZE:
	case BTRFS_IOC_SCAN_DEV:
	case BTRFS_IOC_ADD_DEV:
	case BTRFS_IOC_RM_DEV:
	case BTRFS_IOC_SUBVOL_CREATE:
	case BTRFS_IOC_SNAP_DESTROY:
	case BTRFS_IOC_DEVICES_READY: { /* W */
		struct btrfs_ioctl_vol_args args;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &args))
			break;

		tprintf("{fd=%" PRI__d64 ", name=", args.fd);
		print_quoted_string(args.name, sizeof(args.name),
				    QUOTE_0_TERMINATED);
		tprints("}");
		break;
	}

	case BTRFS_IOC_SNAP_CREATE_V2:
	case BTRFS_IOC_SUBVOL_CREATE_V2: { /* code is W, but is actually RW */
		struct btrfs_ioctl_vol_args_v2 args;

		if (entering(tcp))
			tprints(", ");
		else if (syserror(tcp))
			break;
		else
			tprints(" => ");

		if (umove_or_printaddr(tcp, arg, &args))
			break;

		if (entering(tcp)) {
			tprintf("{fd=%" PRI__d64 ", flags=", args.fd);
			printflags64(btrfs_snap_flags_v2, args.flags,
				     "BTRFS_SUBVOL_???");
			if (args.flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
				tprintf(", size=%" PRI__u64 ", qgroup_inherit=",
					args.size);

				btrfs_print_qgroup_inherit(tcp,
					(unsigned long)args.qgroup_inherit);

			}
			tprintf(", name=");
			print_quoted_string(args.name,
					    BTRFS_SUBVOL_NAME_MAX + 1,
					    QUOTE_0_TERMINATED);
			tprints("}");
			return 0;
		}
		tprintf("{transid=%" PRI__u64 "}", args.transid);
		break;
	}
	case BTRFS_IOC_GET_FSLABEL: /* R */
	case BTRFS_IOC_SET_FSLABEL: {/* W */
		char label[BTRFS_LABEL_SIZE];
		if (code == BTRFS_IOC_GET_FSLABEL && entering(tcp))
			return 0;

		tprints(", ");
		if (umove_or_printaddr(tcp, arg, &label))
			break;
		print_quoted_string(label, sizeof(label), QUOTE_0_TERMINATED);
		break;
	}

	case BTRFS_IOC_CLONE:			/* FICLONE */
	case BTRFS_IOC_CLONE_RANGE:		/* FICLONERANGE */
	case BTRFS_IOC_FILE_EXTENT_SAME:	/* FIDEDUPERANGE */
		/*
		 * FICLONE, FICLONERANGE, and FIDEDUPERANGE started out as
		 * btrfs ioctls and the code was kept for the generic
		 * implementations.  We use the BTRFS_* names here because
		 * they will be available on older systems.
		 */
		return file_ioctl(tcp, code, arg);

	default:
		return RVAL_DECODED;
	};
	return RVAL_DECODED | 1;
}
#endif /* HAVE_LINUX_BTRFS_H */