[fio.git] / oslib / linux-blkzoned.c

/*
 * Copyright (C) 2020 Western Digital Corporation or its affiliates.
 *
 * This file is released under the GPL.
 */
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>

#include "file.h"
#include "fio.h"
#include "lib/pow2.h"
#include "log.h"
#include "oslib/asprintf.h"
#include "smalloc.h"
#include "verify.h"
#include "zbd_types.h"

#include <linux/blkzoned.h>
#ifndef BLKFINISHZONE
#define BLKFINISHZONE _IOW(0x12, 136, struct blk_zone_range)
#endif

/*
 * If the uapi headers installed on the system lacks zone capacity support,
 * use our local versions. If the installed headers are recent enough to
 * support zone capacity, do not redefine any structs.
 */
#ifndef CONFIG_HAVE_REP_CAPACITY
#define BLK_ZONE_REP_CAPACITY	(1 << 0)

struct blk_zone_v2 {
	__u64	start;          /* Zone start sector */
	__u64	len;            /* Zone length in number of sectors */
	__u64	wp;             /* Zone write pointer position */
	__u8	type;           /* Zone type */
	__u8	cond;           /* Zone condition */
	__u8	non_seq;        /* Non-sequential write resources active */
	__u8	reset;          /* Reset write pointer recommended */
	__u8	resv[4];
	__u64	capacity;       /* Zone capacity in number of sectors */
	__u8	reserved[24];
};
#define blk_zone blk_zone_v2

struct blk_zone_report_v2 {
	__u64	sector;
	__u32	nr_zones;
	__u32	flags;
struct blk_zone zones[0];
};
#define blk_zone_report blk_zone_report_v2
#endif /* CONFIG_HAVE_REP_CAPACITY */

/*
 * Read up to 255 characters from the first line of a file. Strip the trailing
 * newline.
 */
static char *read_file(const char *path)
{
	char line[256], *p = line;
	FILE *f;

	f = fopen(path, "rb");
	if (!f)
		return NULL;
	if (!fgets(line, sizeof(line), f))
		line[0] = '\0';
	strsep(&p, "\n");
	fclose(f);

	return strdup(line);
}

/*
 * Get the value of a sysfs attribute for a block device.
 *
 * Returns NULL on failure.
 * Returns a pointer to a string on success.
 * The caller is responsible for freeing the memory.
 */
static char *blkzoned_get_sysfs_attr(const char *file_name, const char *attr)
{
	char *attr_path = NULL;
	struct stat statbuf;
	char *sys_devno_path = NULL;
	char *part_attr_path = NULL;
	char *part_str = NULL;
	char sys_path[PATH_MAX];
	ssize_t sz;
	char *delim = NULL;
	char *attr_str = NULL;

	if (stat(file_name, &statbuf) < 0)
		goto out;

	if (asprintf(&sys_devno_path, "/sys/dev/block/%d:%d",
		     major(statbuf.st_rdev), minor(statbuf.st_rdev)) < 0)
		goto out;

	sz = readlink(sys_devno_path, sys_path, sizeof(sys_path) - 1);
	if (sz < 0)
		goto out;
	sys_path[sz] = '\0';

	/*
	 * If the device is a partition device, cut the device name in the
	 * canonical sysfs path to obtain the sysfs path of the holder device.
	 *   e.g.:  /sys/devices/.../sda/sda1 -> /sys/devices/.../sda
	 */
	if (asprintf(&part_attr_path, "/sys/dev/block/%s/partition",
		     sys_path) < 0)
		goto out;
	part_str = read_file(part_attr_path);
	if (part_str && *part_str == '1') {
		delim = strrchr(sys_path, '/');
		if (!delim)
			goto out;
		*delim = '\0';
	}

	if (asprintf(&attr_path,
		     "/sys/dev/block/%s/%s", sys_path, attr) < 0)
		goto out;

	attr_str = read_file(attr_path);
out:
	free(attr_path);
	free(part_str);
	free(part_attr_path);
	free(sys_devno_path);

	return attr_str;
}

int blkzoned_get_zoned_model(struct thread_data *td, struct fio_file *f,
			     enum zbd_zoned_model *model)
{
	char *model_str = NULL;

	if (f->filetype != FIO_TYPE_BLOCK)
		return -EINVAL;

	*model = ZBD_NONE;

	model_str = blkzoned_get_sysfs_attr(f->file_name, "queue/zoned");
	if (!model_str)
		return 0;

	dprint(FD_ZBD, "%s: zbd model string: %s\n", f->file_name, model_str);
	if (strcmp(model_str, "host-aware") == 0)
		*model = ZBD_HOST_AWARE;
	else if (strcmp(model_str, "host-managed") == 0)
		*model = ZBD_HOST_MANAGED;

	free(model_str);

	return 0;
}

int blkzoned_get_max_open_zones(struct thread_data *td, struct fio_file *f,
				unsigned int *max_open_zones)
{
	char *max_open_str;

	if (f->filetype != FIO_TYPE_BLOCK)
		return -EIO;

	max_open_str = blkzoned_get_sysfs_attr(f->file_name, "queue/max_open_zones");
	if (!max_open_str) {
		*max_open_zones = 0;
		return 0;
	}

	dprint(FD_ZBD, "%s: max open zones supported by device: %s\n",
	       f->file_name, max_open_str);
	*max_open_zones = atoll(max_open_str);

	free(max_open_str);

	return 0;
}

int blkzoned_get_max_active_zones(struct thread_data *td, struct fio_file *f,
				  unsigned int *max_active_zones)
{
	char *max_active_str;

	if (f->filetype != FIO_TYPE_BLOCK)
		return -EIO;

	max_active_str = blkzoned_get_sysfs_attr(f->file_name, "queue/max_active_zones");
	if (!max_active_str) {
		*max_active_zones = 0;
		return 0;
	}

	dprint(FD_ZBD, "%s: max active zones supported by device: %s\n",
	       f->file_name, max_active_str);
	*max_active_zones = atoll(max_active_str);

	free(max_active_str);

	return 0;
}

static uint64_t zone_capacity(struct blk_zone_report *hdr,
			      struct blk_zone *blkz)
{
	if (hdr->flags & BLK_ZONE_REP_CAPACITY)
		return blkz->capacity << 9;
	return blkz->len << 9;
}

int blkzoned_report_zones(struct thread_data *td, struct fio_file *f,
			  uint64_t offset, struct zbd_zone *zones,
			  unsigned int nr_zones)
{
	struct blk_zone_report *hdr = NULL;
	struct blk_zone *blkz;
	struct zbd_zone *z;
	unsigned int i;
	int fd = -1, ret;

	fd = open(f->file_name, O_RDONLY | O_LARGEFILE);
	if (fd < 0)
		return -errno;

	hdr = calloc(1, sizeof(struct blk_zone_report) +
			nr_zones * sizeof(struct blk_zone));
	if (!hdr) {
		ret = -ENOMEM;
		goto out;
	}

	hdr->nr_zones = nr_zones;
	hdr->sector = offset >> 9;
	ret = ioctl(fd, BLKREPORTZONE, hdr);
	if (ret) {
		log_err("%s: BLKREPORTZONE ioctl failed, ret=%d, err=%d.\n",
			f->file_name, ret, -errno);
		ret = -errno;
		goto out;
	}

	nr_zones = hdr->nr_zones;
	blkz = (void *) hdr + sizeof(*hdr);
	z = &zones[0];
	for (i = 0; i < nr_zones; i++, z++, blkz++) {
		z->start = blkz->start << 9;
		z->wp = blkz->wp << 9;
		z->len = blkz->len << 9;
		z->capacity = zone_capacity(hdr, blkz);

		switch (blkz->type) {
		case BLK_ZONE_TYPE_CONVENTIONAL:
			z->type = ZBD_ZONE_TYPE_CNV;
			break;
		case BLK_ZONE_TYPE_SEQWRITE_REQ:
			z->type = ZBD_ZONE_TYPE_SWR;
			break;
		case BLK_ZONE_TYPE_SEQWRITE_PREF:
			z->type = ZBD_ZONE_TYPE_SWP;
			break;
		default:
			td_verror(td, errno, "invalid zone type");
			log_err("%s: invalid type for zone at sector %llu.\n",
				f->file_name, (unsigned long long)offset >> 9);
			ret = -EIO;
			goto out;
		}

		switch (blkz->cond) {
		case BLK_ZONE_COND_NOT_WP:
			z->cond = ZBD_ZONE_COND_NOT_WP;
			break;
		case BLK_ZONE_COND_EMPTY:
			z->cond = ZBD_ZONE_COND_EMPTY;
			break;
		case BLK_ZONE_COND_IMP_OPEN:
			z->cond = ZBD_ZONE_COND_IMP_OPEN;
			break;
		case BLK_ZONE_COND_EXP_OPEN:
			z->cond = ZBD_ZONE_COND_EXP_OPEN;
			break;
		case BLK_ZONE_COND_CLOSED:
			z->cond = ZBD_ZONE_COND_CLOSED;
			break;
		case BLK_ZONE_COND_FULL:
			z->cond = ZBD_ZONE_COND_FULL;
			break;
		case BLK_ZONE_COND_READONLY:
		case BLK_ZONE_COND_OFFLINE:
		default:
			/* Treat all these conditions as offline (don't use!) */
			z->cond = ZBD_ZONE_COND_OFFLINE;
			z->wp = z->start;
		}
	}

	ret = nr_zones;
out:
	free(hdr);
	close(fd);

	return ret;
}

int blkzoned_reset_wp(struct thread_data *td, struct fio_file *f,
		      uint64_t offset, uint64_t length)
{
	struct blk_zone_range zr = {
		.sector         = offset >> 9,
		.nr_sectors     = length >> 9,
	};
	int fd, ret = 0;

	/* If the file is not yet opened, open it for this function. */
	fd = f->fd;
	if (fd < 0) {
		fd = open(f->file_name, O_RDWR | O_LARGEFILE);
		if (fd < 0)
			return -errno;
	}

	if (ioctl(fd, BLKRESETZONE, &zr) < 0)
		ret = -errno;

	if (f->fd < 0)
		close(fd);

	return ret;
}

int blkzoned_finish_zone(struct thread_data *td, struct fio_file *f,
			 uint64_t offset, uint64_t length)
{
	struct blk_zone_range zr = {
		.sector         = offset >> 9,
		.nr_sectors     = length >> 9,
	};
	int fd, ret = 0;

	/* If the file is not yet opened, open it for this function. */
	fd = f->fd;
	if (fd < 0) {
		fd = open(f->file_name, O_RDWR | O_LARGEFILE);
		if (fd < 0)
			return -errno;
	}

	if (ioctl(fd, BLKFINISHZONE, &zr) < 0) {
		ret = -errno;
		/*
		 * Kernel versions older than 5.5 do not support BLKFINISHZONE
		 * and return the ENOTTY error code. These old kernels only
		 * support block devices that close zones automatically.
		 */
		if (ret == ENOTTY)
			ret = 0;
	}

	if (f->fd < 0)
		close(fd);

	return ret;
}
Commit	Line	Data
b7694961 DLM	1	/*
	2	* Copyright (C) 2020 Western Digital Corporation or its affiliates.
	3	*
	4	* This file is released under the GPL.
	5	*/
	6	#include <errno.h>
	7	#include <string.h>
	8	#include <stdlib.h>
	9	#include <dirent.h>
	10	#include <fcntl.h>
	11	#include <sys/ioctl.h>
	12	#include <sys/stat.h>
	13	#include <unistd.h>
	14
	15	#include "file.h"
	16	#include "fio.h"
	17	#include "lib/pow2.h"
	18	#include "log.h"
	19	#include "oslib/asprintf.h"
	20	#include "smalloc.h"
	21	#include "verify.h"
	22	#include "zbd_types.h"
	23
	24	#include <linux/blkzoned.h>
8e2b81b8 BVA	25	#ifndef BLKFINISHZONE
	26	#define BLKFINISHZONE _IOW(0x12, 136, struct blk_zone_range)
	27	#endif
b7694961	28
6ee607ba NC	29	/*
	30	* If the uapi headers installed on the system lacks zone capacity support,
	31	* use our local versions. If the installed headers are recent enough to
	32	* support zone capacity, do not redefine any structs.
	33	*/
	34	#ifndef CONFIG_HAVE_REP_CAPACITY
	35	#define BLK_ZONE_REP_CAPACITY (1 << 0)
	36
	37	struct blk_zone_v2 {
	38	__u64 start; /* Zone start sector */
	39	__u64 len; /* Zone length in number of sectors */
	40	__u64 wp; /* Zone write pointer position */
	41	__u8 type; /* Zone type */
	42	__u8 cond; /* Zone condition */
	43	__u8 non_seq; /* Non-sequential write resources active */
	44	__u8 reset; /* Reset write pointer recommended */
	45	__u8 resv[4];
	46	__u64 capacity; /* Zone capacity in number of sectors */
	47	__u8 reserved[24];
	48	};
	49	#define blk_zone blk_zone_v2
	50
	51	struct blk_zone_report_v2 {
	52	__u64 sector;
	53	__u32 nr_zones;
	54	__u32 flags;
	55	struct blk_zone zones[0];
	56	};
	57	#define blk_zone_report blk_zone_report_v2
	58	#endif /* CONFIG_HAVE_REP_CAPACITY */
	59
b7694961 DLM	60	/*
	61	* Read up to 255 characters from the first line of a file. Strip the trailing
	62	* newline.
	63	*/
	64	static char read_file(const char path)
	65	{
	66	char line[256], *p = line;
	67	FILE *f;
	68
	69	f = fopen(path, "rb");
	70	if (!f)
	71	return NULL;
	72	if (!fgets(line, sizeof(line), f))
	73	line[0] = '\0';
	74	strsep(&p, "\n");
	75	fclose(f);
	76
	77	return strdup(line);
	78	}
	79
eaa45783 NC	80	/*
	81	* Get the value of a sysfs attribute for a block device.
	82	*
	83	* Returns NULL on failure.
	84	* Returns a pointer to a string on success.
	85	* The caller is responsible for freeing the memory.
	86	*/
	87	static char blkzoned_get_sysfs_attr(const char file_name, const char *attr)
b7694961	88	{
eaa45783	89	char *attr_path = NULL;
b7694961 DLM	90	struct stat statbuf;
	91	char *sys_devno_path = NULL;
	92	char *part_attr_path = NULL;
	93	char *part_str = NULL;
	94	char sys_path[PATH_MAX];
	95	ssize_t sz;
	96	char *delim = NULL;
eaa45783	97	char *attr_str = NULL;
b7694961 DLM	98
	99	if (stat(file_name, &statbuf) < 0)
	100	goto out;
	101
	102	if (asprintf(&sys_devno_path, "/sys/dev/block/%d:%d",
	103	major(statbuf.st_rdev), minor(statbuf.st_rdev)) < 0)
	104	goto out;
	105
	106	sz = readlink(sys_devno_path, sys_path, sizeof(sys_path) - 1);
	107	if (sz < 0)
	108	goto out;
	109	sys_path[sz] = '\0';
	110
	111	/*
	112	* If the device is a partition device, cut the device name in the
	113	* canonical sysfs path to obtain the sysfs path of the holder device.
	114	* e.g.: /sys/devices/.../sda/sda1 -> /sys/devices/.../sda
	115	*/
	116	if (asprintf(&part_attr_path, "/sys/dev/block/%s/partition",
	117	sys_path) < 0)
	118	goto out;
	119	part_str = read_file(part_attr_path);
	120	if (part_str && *part_str == '1') {
	121	delim = strrchr(sys_path, '/');
	122	if (!delim)
	123	goto out;
	124	*delim = '\0';
	125	}
	126
eaa45783 NC	127	if (asprintf(&attr_path,
eaa45783 NC	128	"/sys/dev/block/%s/%s", sys_path, attr) < 0)
b7694961 DLM	129	goto out;
b7694961 DLM	130
eaa45783 NC	131	attr_str = read_file(attr_path);
	132	out:
	133	free(attr_path);
	134	free(part_str);
	135	free(part_attr_path);
	136	free(sys_devno_path);
	137
	138	return attr_str;
	139	}
	140
	141	int blkzoned_get_zoned_model(struct thread_data td, struct fio_file f,
	142	enum zbd_zoned_model *model)
	143	{
	144	char *model_str = NULL;
	145
2c7dd23e NC	146	if (f->filetype != FIO_TYPE_BLOCK)
2c7dd23e NC	147	return -EINVAL;
eaa45783 NC	148
	149	*model = ZBD_NONE;
	150
	151	model_str = blkzoned_get_sysfs_attr(f->file_name, "queue/zoned");
b7694961	152	if (!model_str)
eaa45783 NC	153	return 0;
	154
	155	dprint(FD_ZBD, "%s: zbd model string: %s\n", f->file_name, model_str);
b7694961 DLM	156	if (strcmp(model_str, "host-aware") == 0)
	157	*model = ZBD_HOST_AWARE;
	158	else if (strcmp(model_str, "host-managed") == 0)
	159	*model = ZBD_HOST_MANAGED;
eaa45783	160
b7694961	161	free(model_str);
eaa45783	162
b7694961 DLM	163	return 0;
	164	}
	165
d2f442bc NC	166	int blkzoned_get_max_open_zones(struct thread_data td, struct fio_file f,
	167	unsigned int *max_open_zones)
	168	{
	169	char *max_open_str;
	170
	171	if (f->filetype != FIO_TYPE_BLOCK)
	172	return -EIO;
	173
	174	max_open_str = blkzoned_get_sysfs_attr(f->file_name, "queue/max_open_zones");
f3463241 DLM	175	if (!max_open_str) {
f3463241 DLM	176	*max_open_zones = 0;
d2f442bc	177	return 0;
f3463241	178	}
d2f442bc NC	179
	180	dprint(FD_ZBD, "%s: max open zones supported by device: %s\n",
	181	f->file_name, max_open_str);
	182	*max_open_zones = atoll(max_open_str);
	183
	184	free(max_open_str);
	185
	186	return 0;
	187	}
	188
9e523ef8 SK	189	int blkzoned_get_max_active_zones(struct thread_data td, struct fio_file f,
	190	unsigned int *max_active_zones)
	191	{
	192	char *max_active_str;
	193
	194	if (f->filetype != FIO_TYPE_BLOCK)
	195	return -EIO;
	196
	197	max_active_str = blkzoned_get_sysfs_attr(f->file_name, "queue/max_active_zones");
	198	if (!max_active_str) {
	199	*max_active_zones = 0;
	200	return 0;
	201	}
	202
	203	dprint(FD_ZBD, "%s: max active zones supported by device: %s\n",
	204	f->file_name, max_active_str);
	205	*max_active_zones = atoll(max_active_str);
	206
	207	free(max_active_str);
	208
	209	return 0;
	210	}
	211
236d23a8 SK	212	static uint64_t zone_capacity(struct blk_zone_report *hdr,
	213	struct blk_zone *blkz)
	214	{
236d23a8 SK	215	if (hdr->flags & BLK_ZONE_REP_CAPACITY)
236d23a8 SK	216	return blkz->capacity << 9;
236d23a8 SK	217	return blkz->len << 9;
	218	}
	219
b7694961 DLM	220	int blkzoned_report_zones(struct thread_data td, struct fio_file f,
	221	uint64_t offset, struct zbd_zone *zones,
	222	unsigned int nr_zones)
	223	{
	224	struct blk_zone_report *hdr = NULL;
	225	struct blk_zone *blkz;
	226	struct zbd_zone *z;
	227	unsigned int i;
	228	int fd = -1, ret;
	229
	230	fd = open(f->file_name, O_RDONLY \| O_LARGEFILE);
	231	if (fd < 0)
	232	return -errno;
	233
	234	hdr = calloc(1, sizeof(struct blk_zone_report) +
	235	nr_zones * sizeof(struct blk_zone));
	236	if (!hdr) {
	237	ret = -ENOMEM;
	238	goto out;
	239	}
	240
	241	hdr->nr_zones = nr_zones;
	242	hdr->sector = offset >> 9;
	243	ret = ioctl(fd, BLKREPORTZONE, hdr);
	244	if (ret) {
db46d820 DF	245	log_err("%s: BLKREPORTZONE ioctl failed, ret=%d, err=%d.\n",
db46d820 DF	246	f->file_name, ret, -errno);
b7694961 DLM	247	ret = -errno;
	248	goto out;
	249	}
	250
	251	nr_zones = hdr->nr_zones;
f8779edf	252	blkz = (void ) hdr + sizeof(hdr);
b7694961 DLM	253	z = &zones[0];
	254	for (i = 0; i < nr_zones; i++, z++, blkz++) {
	255	z->start = blkz->start << 9;
	256	z->wp = blkz->wp << 9;
	257	z->len = blkz->len << 9;
236d23a8	258	z->capacity = zone_capacity(hdr, blkz);
b7694961 DLM	259
	260	switch (blkz->type) {
	261	case BLK_ZONE_TYPE_CONVENTIONAL:
	262	z->type = ZBD_ZONE_TYPE_CNV;
	263	break;
	264	case BLK_ZONE_TYPE_SEQWRITE_REQ:
	265	z->type = ZBD_ZONE_TYPE_SWR;
	266	break;
	267	case BLK_ZONE_TYPE_SEQWRITE_PREF:
	268	z->type = ZBD_ZONE_TYPE_SWP;
	269	break;
	270	default:
	271	td_verror(td, errno, "invalid zone type");
	272	log_err("%s: invalid type for zone at sector %llu.\n",
	273	f->file_name, (unsigned long long)offset >> 9);
	274	ret = -EIO;
	275	goto out;
	276	}
	277
	278	switch (blkz->cond) {
	279	case BLK_ZONE_COND_NOT_WP:
	280	z->cond = ZBD_ZONE_COND_NOT_WP;
	281	break;
	282	case BLK_ZONE_COND_EMPTY:
	283	z->cond = ZBD_ZONE_COND_EMPTY;
	284	break;
	285	case BLK_ZONE_COND_IMP_OPEN:
	286	z->cond = ZBD_ZONE_COND_IMP_OPEN;
	287	break;
	288	case BLK_ZONE_COND_EXP_OPEN:
	289	z->cond = ZBD_ZONE_COND_EXP_OPEN;
	290	break;
	291	case BLK_ZONE_COND_CLOSED:
	292	z->cond = ZBD_ZONE_COND_CLOSED;
	293	break;
	294	case BLK_ZONE_COND_FULL:
	295	z->cond = ZBD_ZONE_COND_FULL;
	296	break;
	297	case BLK_ZONE_COND_READONLY:
	298	case BLK_ZONE_COND_OFFLINE:
	299	default:
	300	/* Treat all these conditions as offline (don't use!) */
	301	z->cond = ZBD_ZONE_COND_OFFLINE;
59b67452	302	z->wp = z->start;
b7694961 DLM	303	}
	304	}
	305
	306	ret = nr_zones;
	307	out:
	308	free(hdr);
	309	close(fd);
	310
	311	return ret;
	312	}
	313
	314	int blkzoned_reset_wp(struct thread_data td, struct fio_file f,
	315	uint64_t offset, uint64_t length)
	316	{
	317	struct blk_zone_range zr = {
	318	.sector = offset >> 9,
	319	.nr_sectors = length >> 9,
	320	};
b4824992 SK	321	int fd, ret = 0;
	322
	323	/* If the file is not yet opened, open it for this function. */
	324	fd = f->fd;
	325	if (fd < 0) {
	326	fd = open(f->file_name, O_RDWR \| O_LARGEFILE);
	327	if (fd < 0)
	328	return -errno;
	329	}
b7694961	330
b4824992 SK	331	if (ioctl(fd, BLKRESETZONE, &zr) < 0)
b4824992 SK	332	ret = -errno;
b7694961	333
b4824992 SK	334	if (f->fd < 0)
	335	close(fd);
	336
	337	return ret;
b7694961	338	}
f8ec93e4 SK	339
	340	int blkzoned_finish_zone(struct thread_data td, struct fio_file f,
	341	uint64_t offset, uint64_t length)
	342	{
f8ec93e4 SK	343	struct blk_zone_range zr = {
	344	.sector = offset >> 9,
	345	.nr_sectors = length >> 9,
	346	};
	347	int fd, ret = 0;
	348
	349	/* If the file is not yet opened, open it for this function. */
	350	fd = f->fd;
	351	if (fd < 0) {
	352	fd = open(f->file_name, O_RDWR \| O_LARGEFILE);
	353	if (fd < 0)
	354	return -errno;
	355	}
	356
8e2b81b8	357	if (ioctl(fd, BLKFINISHZONE, &zr) < 0) {
f8ec93e4	358	ret = -errno;
8e2b81b8 BVA	359	/*
	360	* Kernel versions older than 5.5 do not support BLKFINISHZONE
	361	* and return the ENOTTY error code. These old kernels only
	362	* support block devices that close zones automatically.
	363	*/
	364	if (ret == ENOTTY)
	365	ret = 0;
	366	}
f8ec93e4 SK	367
	368	if (f->fd < 0)
	369	close(fd);
	370
	371	return ret;
f8ec93e4	372	}