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file_zbc.c
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file_zbc.c
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/*
* Copyright 2017, Western Digital Inc.
*
* This file is licensed to you under your choice of the GNU Lesser
* General Public License, version 2.1 or any later version (LGPLv2.1 or
* later), or the Apache License 2.0.
*/
/*
* ZBC device emulation with a file backstore.
*/
#define _GNU_SOURCE
#include <stddef.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <endian.h>
#include <errno.h>
#include <scsi/scsi.h>
#include <linux/types.h>
#include "scsi_defs.h"
#include "libtcmu.h"
#include "tcmu-runner.h"
#include "tcmur_device.h"
/*
* SCSI commands.
*/
#define ZBC_OUT 0x94
#define ZBC_IN 0x95
/*
* ZBC IN/OUT Sevice Actions
*/
#define ZBC_SA_REPORT_ZONES 0x00
#define ZBC_SA_CLOSE_ZONE 0x01
#define ZBC_SA_FINISH_ZONE 0x02
#define ZBC_SA_OPEN_ZONE 0x03
#define ZBC_SA_RESET_WP 0x04
/*
* SCSI additional sense codes.
*/
#define ASC_READ_ERROR 0x1100
#define ASC_WRITE_ERROR 0x0C00
#define ASC_LBA_OUT_OF_RANGE 0x2100
#define ASC_INVALID_FIELD_IN_CDB 0x2400
#define ASC_INTERNAL_TARGET_FAILURE 0x4400
/*
* ZBC related additional sense codes.
*/
#define ASC_UNALIGNED_WRITE_COMMAND 0x2104
#define ASC_WRITE_BOUNDARY_VIOLATION 0x2105
#define ASC_ATTEMPT_TO_READ_INVALID_DATA 0x2106
#define ASC_READ_BOUNDARY_VIOLATION 0x2107
#define ASC_INSUFFICIENT_ZONE_RESOURCES 0x550E
/*
* Device zone model.
*/
enum zbc_dev_model {
ZBC_HA = 0x00,
ZBC_HM = 0x14,
};
/*
* Zone types.
*/
enum zbc_zone_type {
ZBC_ZONE_TYPE_CONVENTIONAL = 0x1,
ZBC_ZONE_TYPE_SEQWRITE_REQ = 0x2,
ZBC_ZONE_TYPE_SEQWRITE_PREF = 0x3,
};
/*
* Zone conditions.
*/
enum zbc_zone_cond {
ZBC_ZONE_COND_NOT_WP = 0x0,
ZBC_ZONE_COND_EMPTY = 0x1,
ZBC_ZONE_COND_IMP_OPEN = 0x2,
ZBC_ZONE_COND_EXP_OPEN = 0x3,
ZBC_ZONE_COND_CLOSED = 0x4,
ZBC_ZONE_COND_READONLY = 0xD,
ZBC_ZONE_COND_FULL = 0xE,
ZBC_ZONE_COND_OFFLINE = 0xF,
};
/*
* Metadata zone descriptor.
*/
struct zbc_zone {
__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 reserved[36];
};
/*
* Test zone type.
*/
#define zbc_zone_conv(z) ((z)->type == ZBC_ZONE_TYPE_CONVENTIONAL)
#define zbc_zone_seq_req(z) ((z)->type == ZBC_ZONE_TYPE_SEQWRITE_REQ)
#define zbc_zone_seq_pref(z) ((z)->type == ZBC_ZONE_TYPE_SEQWRITE_PREF)
#define zbc_zone_seq(z) (!zbc_zone_conv(z))
/*
* Test zone conditions.
*/
#define zbc_zone_empty(z) ((z)->cond == ZBC_ZONE_COND_EMPTY)
#define zbc_zone_full(z) ((z)->cond == ZBC_ZONE_COND_FULL)
#define zbc_zone_imp_open(z) ((z)->cond == ZBC_ZONE_COND_IMP_OPEN)
#define zbc_zone_exp_open(z) ((z)->cond == ZBC_ZONE_COND_EXP_OPEN)
#define zbc_zone_is_open(z) (zbc_zone_imp_open(z) || zbc_zone_exp_open(z))
#define zbc_zone_closed(z) ((z)->cond == ZBC_ZONE_COND_CLOSED)
#define zbc_zone_not_wp(z) ((z)->cond == ZBC_ZONE_COND_NOT_WP)
#define zbc_zone_closed(z) ((z)->cond == ZBC_ZONE_COND_CLOSED)
#define zbc_zone_offline(z) ((z)->cond == ZBC_ZONE_COND_OFFLINE)
#define zbc_zone_rdonly(z) ((z)->cond == ZBC_ZONE_COND_READONLY)
#define zbc_zone_rwp(z) ((z)->reset)
#define zbc_zone_non_seq(z) ((z)->non_seq)
/*
* Reporting options.
*/
enum zbc_reporting_options {
/* List all of the zones in the device */
ZBC_RO_ALL = 0x00,
/* List the zones with a Zone Condition of EMPTY */
ZBC_RO_EMPTY = 0x01,
/* List the zones with a Zone Condition of IMPLICIT OPEN */
ZBC_RO_IMP_OPEN = 0x02,
/* List the zones with a Zone Condition of EXPLICIT OPEN */
ZBC_RO_EXP_OPEN = 0x03,
/* List the zones with a Zone Condition of CLOSED */
ZBC_RO_CLOSED = 0x04,
/* List the zones with a Zone Condition of FULL */
ZBC_RO_FULL = 0x05,
/* List the zones with a Zone Condition of READ ONLY */
ZBC_RO_READONLY = 0x06,
/* List the zones with a Zone Condition of OFFLINE */
ZBC_RO_OFFLINE = 0x07,
/* 08h to 0Fh Reserved */
/* List the zones with a zone attribute RESET WP RECOMMENDED set */
ZBC_RO_RWP_RECOMMENDED = 0x10,
/* List the zones with a zone attribute NON_SEQ set */
ZBC_RO_NON_SEQ = 0x11,
/* 12h to 3Eh Reserved */
/* List of the zones with a Zone Condition of NOT WP */
ZBC_RO_NOT_WP = 0x3f,
/* Partial report flag */
ZBC_RO_PARTIAL = 0x80,
};
/*
* Metadata magic.
*/
#define ZBC_MAGIC ((__u32)'U' << 24 | \
(__u32)'Z' << 16 | \
(__u32)'B' << 8 | \
(__u32)'C')
/*
* Disk parameters (metadata).
*/
struct zbc_meta {
/* Magic */
__u32 magic;
/* Device zone model */
__u32 model;
/* Device size (LBAs) */
__u64 capacity;
/* LBA size (B) */
__u32 lba_size;
/* Zone size in (LBAs) */
__u32 zone_size;
/* Number of zones */
__u32 nr_zones;
/* Number of conventional zones */
__u32 nr_conv_zones;
/* Maximum/optimal number of open zones */
__u32 nr_open_zones;
/* Number of implicitly open zones */
__u32 nr_imp_open;
/* Number of explicitly open zones */
__u32 nr_exp_open;
};
/*
* Emulated device configuration.
* Values come from parsing the configuration string, except for the device size
* which is obtained using tcmu_dev_getice_size().
*/
struct zbc_dev_config {
/* Backstore file path */
char *path;
/* Device size in bytes */
long long dev_size;
/* Configuration options */
bool need_format;
enum zbc_dev_model model;
size_t lba_size;
size_t zone_size;
unsigned int conv_num;
unsigned int open_num;
};
#define ZBC_CONF_DEFAULT_MODEL ZBC_HM
#define ZBC_CONF_DEFAULT_ZSIZE (256 * 1024 * 1024)
#define ZBC_CONF_DEFAULT_LBA_SIZE 512
#define ZBC_CONF_DEFAULT_CONV_NUM (unsigned int)(-1)
#define ZBC_CONF_DEFAULT_OPEN_NUM 128
/*
* Emulated device descriptor private data.
*/
struct zbc_dev {
struct tcmu_device *dev;
struct zbc_dev_config cfg;
int fd;
size_t meta_size;
struct zbc_meta *meta;
enum zbc_dev_model model;
unsigned long long capacity;
size_t lba_size;
size_t zone_size;
struct zbc_zone *zones;
unsigned int nr_zones;
unsigned int nr_conv_zones;
unsigned int nr_open_zones;
unsigned int nr_imp_open;
unsigned int nr_exp_open;
};
static char *zbc_parse_model(char *val, struct zbc_dev_config *cfg, char **msg)
{
/* Device model */
if (strncmp(val, "HA", 2) == 0) {
cfg->model = ZBC_HA;
return val + 2;
}
if (strncmp(val, "HM", 2) == 0) {
cfg->model = ZBC_HM;
return val + 2;
}
*msg = "Invalid device model";
return NULL;
}
static char *zbc_parse_lba(char *val, struct zbc_dev_config *cfg, char **msg)
{
char *end;
cfg->lba_size = strtoul(val, &end, 10);
if (cfg->lba_size != 512 && cfg->lba_size != 4096) {
*msg = "Invalid LBA size";
return NULL;
}
return end;
}
static char *zbc_parse_zsize(char *val, struct zbc_dev_config *cfg, char **msg)
{
char *end;
cfg->zone_size = strtoul(val, &end, 10) * 1024 * 1024;
if (!cfg->zone_size ||
(cfg->zone_size & (cfg->zone_size - 1))) {
*msg = "Invalid zone size";
return NULL;
}
return end;
}
static char *zbc_parse_conv(char *val, struct zbc_dev_config *cfg, char **msg)
{
char *end;
cfg->conv_num = strtoul(val, &end, 10);
return end;
}
static char *zbc_parse_open(char *val, struct zbc_dev_config *cfg, char **msg)
{
char *end;
cfg->open_num = strtoul(val, &end, 10);
if (!cfg->open_num) {
*msg = "Invalid number of open zones";
return NULL;
}
return end;
}
#define ZBC_PARAMS 5
struct zbc_dev_config_param {
char *name;
char *(*parse)(char *, struct zbc_dev_config *, char **);
} zbc_params[ZBC_PARAMS] = {
{ "model-", zbc_parse_model },
{ "lba-", zbc_parse_lba },
{ "zsize-", zbc_parse_zsize },
{ "conv-", zbc_parse_conv },
{ "open-", zbc_parse_open },
};
/*
* Get emulated device parameters form the backstore file name
* in the configuration string.
*/
static bool zbc_parse_config(const char *cfgstring, struct zbc_dev_config *cfg,
char **reason)
{
struct stat st;
char *str, *msg = NULL;
int i, ret;
/*
* Set default config: 256 MB zone size host managed device,
* 128 maximum open zones.
*/
memset(cfg, 0, sizeof(struct zbc_dev_config));
cfg->model = ZBC_CONF_DEFAULT_MODEL;
cfg->lba_size = ZBC_CONF_DEFAULT_LBA_SIZE;
cfg->zone_size = ZBC_CONF_DEFAULT_ZSIZE;
cfg->conv_num = ZBC_CONF_DEFAULT_CONV_NUM;
cfg->open_num = ZBC_CONF_DEFAULT_OPEN_NUM;
if (strncmp(cfgstring, "zbc/", 4) != 0)
goto err;
str = (char *)cfgstring + 4;
if (*str != '/') {
/* Parse option parameters */
while (*str && *str != '@') {
for (i = 0; i < ZBC_PARAMS; i++) {
if (strncmp(str, zbc_params[i].name,
strlen(zbc_params[i].name)) == 0)
break;
}
if (i >= ZBC_PARAMS) {
msg = "Invalid option name";
goto failed;
}
str += strlen(zbc_params[i].name);
str = (zbc_params[i].parse)(str, cfg, &msg);
if (!str)
goto failed;
if (*str != '/')
break;
str++;
}
if (*str != '@')
goto err;
str++;
/* Options were specified */
cfg->need_format = true;
}
cfg->path = strdup(str);
if (!cfg->path) {
msg = "Failed to get path";
goto failed;
}
/* Get stats */
ret = stat(cfg->path, &st);
if (ret && errno == ENOENT)
/* New file: reformat */
cfg->need_format = true;
return true;
err:
msg = "Invalid configuration string format";
failed:
if (!msg || asprintf(reason, "%s", msg) == -1)
*reason = NULL;
return false;
}
/*
* Return metadata size;
*/
static size_t zbc_meta_size(unsigned int nr_zones)
{
return sizeof(struct zbc_meta) + nr_zones * sizeof(struct zbc_zone);
}
/*
* Same, aligned up on the system page size.
*/
static size_t zbc_meta_size_aligned(unsigned int nr_zones)
{
size_t meta_size = zbc_meta_size(nr_zones);
size_t pg_size = sysconf(_SC_PAGESIZE) - 1;
return (meta_size + pg_size - 1) & (~(pg_size - 1));
}
/*
* Mmap the metadata portion of the backstore file.
*/
static int zbc_map_meta(struct zbc_dev *zdev)
{
int ret;
/* Mmap metadata */
zdev->meta = mmap(NULL, zdev->meta_size, PROT_READ | PROT_WRITE,
MAP_SHARED, zdev->fd, 0);
if (zdev->meta == MAP_FAILED) {
ret = -errno;
tcmu_dev_err(zdev->dev, "mmap %s failed (%m)\n",
zdev->cfg.path);
zdev->meta = NULL;
return ret;
}
zdev->zones = (struct zbc_zone *)(zdev->meta + 1);
tcmu_dev_dbg(zdev->dev, "Mapped %zu B of metadata at %p\n",
zdev->meta_size, zdev->meta);
return 0;
}
/*
* Unmap the metadata portion of the backstore file.
*/
static void zbc_unmap_meta(struct zbc_dev *zdev)
{
if (zdev->meta) {
munmap(zdev->meta, zdev->meta_size);
zdev->meta = NULL;
}
}
/*
* Flush metadata.
*/
static int zbc_flush_meta(struct zbc_dev *zdev)
{
int ret;
ret = msync(zdev->meta, zdev->meta_size, MS_SYNC | MS_INVALIDATE);
if (ret) {
ret = -errno;
tcmu_dev_err(zdev->dev, "msync metadata failed (%m)\n");
return ret;
}
return 0;
}
/*
* Check a zone metadata.
*/
static bool zbc_check_zone(struct zbc_dev *zdev,
struct zbc_meta *meta,
unsigned int zno)
{
struct zbc_zone zone;
ssize_t ret;
ret = pread(zdev->fd, &zone, sizeof(struct zbc_zone),
sizeof(struct zbc_meta) + zno * sizeof(struct zbc_zone));
if (ret != sizeof(struct zbc_zone))
return false;
switch (zone.type) {
case ZBC_ZONE_TYPE_CONVENTIONAL:
case ZBC_ZONE_TYPE_SEQWRITE_PREF:
case ZBC_ZONE_TYPE_SEQWRITE_REQ:
break;
default:
return false;
}
if (zbc_zone_seq_pref(&zone) && meta->model != ZBC_HA)
return false;
if (zbc_zone_seq_req(&zone) && meta->model != ZBC_HM)
return false;
if (zbc_zone_conv(&zone) && zone.cond != ZBC_ZONE_COND_NOT_WP)
return false;
if (zone.start % meta->zone_size ||
zone.len > meta->zone_size)
return false;
return true;
}
/*
* Check metadata.
* Return true if the metadata is correct and can be used without reformatting.
*/
static bool zbc_check_meta(struct zbc_dev *zdev, struct stat *st)
{
struct zbc_meta meta;
unsigned int i, nr_zones;
ssize_t ret;
ret = pread(zdev->fd, &meta, sizeof(struct zbc_meta), 0);
if (ret != sizeof(struct zbc_meta))
return false;
if (meta.magic != ZBC_MAGIC)
return false;
if (meta.model != ZBC_HM && meta.model != ZBC_HA)
return false;
if (meta.lba_size != 512 && meta.lba_size != 4096)
return false;
if (meta.capacity * meta.lba_size != zdev->cfg.dev_size)
return false;
if (!meta.zone_size ||
meta.zone_size & (meta.zone_size - 1))
return false;
nr_zones = (meta.capacity + meta.zone_size - 1) / meta.zone_size;
if (meta.nr_zones != nr_zones ||
meta.nr_conv_zones >= nr_zones ||
meta.nr_open_zones > nr_zones)
return false;
zdev->meta_size = zbc_meta_size_aligned(nr_zones);
if (st->st_size != zdev->meta_size + zdev->cfg.dev_size)
return false;
/* Check all zones */
for (i = 0; i < nr_zones; i++) {
if (!zbc_check_zone(zdev, &meta, i)) {
tcmu_dev_err(zdev->dev, "Invalid zone %u\n", i);
return false;
}
}
zdev->model = meta.model;
zdev->capacity = meta.capacity;
zdev->lba_size = meta.lba_size;
zdev->zone_size = meta.zone_size;
zdev->nr_zones = meta.nr_zones;
zdev->nr_conv_zones = meta.nr_conv_zones;
zdev->nr_open_zones = meta.nr_open_zones;
return true;
}
/*
* Format metadata.
*/
static int zbc_format_meta(struct zbc_dev *zdev)
{
struct zbc_dev_config *cfg = &zdev->cfg;
struct zbc_meta *meta;
struct zbc_zone *zone;
unsigned int nr_seq_zones;
__u64 lba = 0;
unsigned int i;
int ret;
zdev->model = cfg->model;
zdev->lba_size = cfg->lba_size;
zdev->capacity = cfg->dev_size / zdev->lba_size;
zdev->zone_size = cfg->zone_size / zdev->lba_size;
zdev->nr_zones = (zdev->capacity + zdev->zone_size - 1) /
zdev->zone_size;
if (cfg->conv_num == ZBC_CONF_DEFAULT_CONV_NUM) {
/* Default: 1% of the capacity as conventional zones */
zdev->nr_conv_zones = zdev->nr_zones / 100;
if (!zdev->nr_conv_zones)
zdev->nr_conv_zones = 1;
} else {
zdev->nr_conv_zones = cfg->conv_num;
if (zdev->nr_conv_zones >= zdev->nr_zones) {
tcmu_dev_err(zdev->dev,
"Too many conventional zones\n");
return -ENOSPC;
}
}
zdev->nr_open_zones = cfg->open_num;
nr_seq_zones = zdev->nr_zones - zdev->nr_conv_zones;
if (zdev->nr_open_zones >= nr_seq_zones / 2) {
zdev->nr_open_zones = nr_seq_zones / 2;
if (!zdev->nr_open_zones)
zdev->nr_open_zones = 1;
}
tcmu_dev_dbg(zdev->dev, "Formatting...\n");
tcmu_dev_dbg(zdev->dev, " Model: %s\n",
cfg->model == ZBC_HM ? "HM" : "HA");
tcmu_dev_dbg(zdev->dev, " LBA size: %zu B\n",
cfg->lba_size);
tcmu_dev_dbg(zdev->dev, " Zone size: %zu MiB\n",
cfg->zone_size);
tcmu_dev_dbg(zdev->dev, " Number of conventional zones: %u\n",
zdev->nr_conv_zones);
tcmu_dev_dbg(zdev->dev, " Number of open zones: %u\n",
cfg->open_num);
/* Truncate file */
zdev->meta_size = zbc_meta_size_aligned(zdev->nr_zones);
ret = ftruncate(zdev->fd, zdev->meta_size + cfg->dev_size);
if (ret < 0) {
ret = -errno;
tcmu_dev_err(zdev->dev, "Truncate %s failed (%m)\n",
cfg->path);
return ret;
}
/* Mmap metadata */
ret = zbc_map_meta(zdev);
if (ret)
return ret;
/* Write metadata */
meta = zdev->meta;
memset(meta, 0, zdev->meta_size);
meta->magic = ZBC_MAGIC;
meta->model = zdev->model;
meta->capacity = zdev->capacity;
meta->lba_size = zdev->lba_size;
meta->zone_size = zdev->zone_size;
meta->nr_zones = zdev->nr_zones;
meta->nr_conv_zones = zdev->nr_conv_zones;
meta->nr_open_zones = zdev->nr_open_zones;
/* Initialize zones */
zone = zdev->zones;
for (i = 0; i < zdev->nr_zones; i++) {
zone->start = lba;
if (zone->start + meta->zone_size > meta->capacity)
zone->len = meta->capacity - zone->start;
else
zone->len = meta->zone_size;
if (i < zdev->nr_conv_zones) {
zone->wp = ULLONG_MAX;
zone->type = ZBC_ZONE_TYPE_CONVENTIONAL;
zone->cond = ZBC_ZONE_COND_NOT_WP;
} else {
zone->wp = zone->start;
if (meta->model == ZBC_HA)
zone->type = ZBC_ZONE_TYPE_SEQWRITE_PREF;
else
zone->type = ZBC_ZONE_TYPE_SEQWRITE_REQ;
zone->cond = ZBC_ZONE_COND_EMPTY;
}
lba += zone->len;
zone++;
}
ret = zbc_flush_meta(zdev);
if (ret) {
zbc_unmap_meta(zdev);
return ret;
}
return 0;
}
static void __zbc_close_zone(struct zbc_dev *zdev, struct zbc_zone *zone);
/*
* Initialize metadata.
*/
static int zbc_init_meta(struct zbc_dev *zdev)
{
struct zbc_zone *zone;
unsigned int i;
int ret;
/* Mmap metadata */
ret = zbc_map_meta(zdev);
if (ret)
return ret;
/* Close all zones */
zone = zdev->zones;
for (i = 0; i < zdev->nr_zones; i++) {
__zbc_close_zone(zdev, zone);
zone++;
}
zdev->nr_imp_open = 0;
zdev->nr_exp_open = 0;
return 0;
}
/*
* Open the emulated backstore file.
* If the file does not exist, it is created and metadata formatted.
*/
static int zbc_open_backstore(struct tcmu_device *dev)
{
struct zbc_dev *zdev = tcmur_dev_get_private(dev);
struct zbc_dev_config *cfg = &zdev->cfg;
struct stat st;
int ret;
/* Get stats */
ret = stat(cfg->path, &st);
if (ret && errno == ENOENT) {
zdev->cfg.need_format = true;
tcmu_dev_dbg(dev, "New backstore file %s\n", cfg->path);
} else {
tcmu_dev_dbg(dev, "Using backstore file %s\n", cfg->path);
if (!S_ISREG(st.st_mode)) {
tcmu_dev_err(dev, "%s is not a regular file\n",
cfg->path);
return -EINVAL;
}
}
/* Open the file */
zdev->fd = open(cfg->path, O_CREAT | O_RDWR | O_LARGEFILE,
S_IRUSR | S_IWUSR);
if (zdev->fd == -1) {
ret = -errno;
tcmu_dev_err(dev, "Open %s failed (%m)\n", cfg->path);
return ret;
}
if (!zbc_check_meta(zdev, &st))
cfg->need_format = true;
if (cfg->need_format)
ret = zbc_format_meta(zdev);
else
ret = zbc_init_meta(zdev);
if (ret)
goto err;
tcmu_dev_set_block_size(dev, zdev->lba_size);
tcmu_dev_set_num_lbas(dev, zdev->capacity);
tcmu_dev_dbg(dev,
"%s: Host %s zone model\n",
cfg->path,
zdev->model == ZBC_HA ? "aware" : "managed");
tcmu_dev_dbg(dev,
"%llu 512-bytes sectors\n",
(zdev->capacity * zdev->lba_size) >> 9);
tcmu_dev_dbg(dev,
"%llu logical blocks of %u B\n",
(unsigned long long) zdev->capacity,
(unsigned int) zdev->lba_size);
tcmu_dev_dbg(dev,
"%.03F GB capacity\n",
(double)(zdev->capacity * zdev->lba_size) / 1000000000);
tcmu_dev_dbg(dev,
"%u zones of %zu 512-bytes sectors (%zu LBAs)\n",
zdev->nr_zones, (zdev->zone_size * zdev->lba_size) >> 9,
zdev->zone_size);
tcmu_dev_dbg(dev,
"%u conventional zones\n",
zdev->nr_conv_zones);
if (zdev->model == ZBC_HM) {
tcmu_dev_dbg(dev,
"Maximum number of open sequential write required zones: %u\n",
zdev->nr_open_zones);
} else {
tcmu_dev_dbg(dev,
"Optimal number of open sequential write preferred zones: %u\n",
zdev->nr_open_zones);
tcmu_dev_dbg(dev,
"Optimal number of non-sequentially written sequential write preferred zones: %u\n",
zdev->nr_open_zones);
}
return 0;
err:
close(zdev->fd);
return ret;
}
/*
* Ready the emulated device.
*/
static int zbc_open(struct tcmu_device *dev, bool reopen)
{
struct zbc_dev *zdev;
char *err = NULL;
int ret;
tcmu_dev_dbg(dev, "Configuration string: %s\n",
tcmu_dev_get_cfgstring(dev));
zdev = calloc(1, sizeof(*zdev));
if (!zdev)
return -ENOMEM;
tcmur_dev_set_private(dev, zdev);
zdev->dev = dev;
/* Parse config */
if (!zbc_parse_config(tcmu_dev_get_cfgstring(dev), &zdev->cfg, &err)) {
if (err) {
tcmu_dev_err(dev, "%s\n", err);
free(err);
}
ret = -EINVAL;
goto err;
}
/* Get device capacity */
zdev->cfg.dev_size = tcmu_cfgfs_dev_get_info_u64(dev, "Size", &ret);
if (ret < 0) {
tcmu_dev_err(dev, "Could not get device size\n");
goto err;
}
/* Open the backstore file */
ret = zbc_open_backstore(dev);
if (ret)
goto err;
return 0;
err:
free(zdev->cfg.path);
free(zdev);
return ret;
}
/*
* Cleanup resources used by the emulated device.
*/
static void zbc_close(struct tcmu_device *dev)
{
struct zbc_dev *zdev = tcmur_dev_get_private(dev);
zbc_unmap_meta(zdev);
close(zdev->fd);
free(zdev->cfg.path);
free(zdev);
}
/*
* VPD page inquiry.
*/
static int zbc_evpd_inquiry(struct tcmu_device *dev, struct tcmulib_cmd *cmd)
{
struct zbc_dev *zdev = tcmur_dev_get_private(dev);
uint8_t *cdb = cmd->cdb;
struct iovec *iovec = cmd->iovec;
size_t iov_cnt = cmd->iov_cnt;
size_t len;
uint8_t data[512];
char *ptr;
size_t used = 0;
char *wwn, *p;
bool next = true;
int block_size;
int max_xfer_len;
uint16_t val16;
uint32_t val32;
uint64_t val64;
int i;
memset(data, 0, sizeof(data));
data[0] = zdev->meta->model;
data[1] = cdb[2];
switch (cdb[2]) {
case 0x00:
/* Supported VPD pages */
data[3] = 5;
data[4] = 0x83;
data[5] = 0xb0;
data[6] = 0xb1;
data[7] = 0xb6;
tcmu_memcpy_into_iovec(iovec, iov_cnt, data, 8);
break;
case 0x83:
/* Device identification */
wwn = tcmu_cfgfs_dev_get_wwn(dev);
if (!wwn)
return tcmu_sense_set_data(cmd->sense_buf,
HARDWARE_ERROR,
ASC_INTERNAL_TARGET_FAILURE);
ptr = (char *)&data[4];
/* 1/5: T10 Vendor id */
ptr[0] = 2; /* code set: ASCII */
ptr[1] = 1; /* identifier: T10 vendor id */
memcpy(&ptr[4], "LIO-ORG ", 8);
len = snprintf(&ptr[12], sizeof(data) - 16, "%s", wwn);
ptr[3] = 8 + len + 1;
used += (uint8_t)ptr[3] + 4;
ptr += used;
/* 2/5: NAA binary */
ptr[0] = 1; /* code set: binary */
ptr[1] = 3; /* identifier: NAA */
ptr[3] = 16; /* body length for naa registered extended format */
/*
* Set type 6 and use OpenFabrics IEEE Company ID: 00 14 05
*/
ptr[4] = 0x60;
ptr[5] = 0x01;
ptr[6] = 0x40;
ptr[7] = 0x50;
/*
* Fill in the rest with a binary representation of WWN
*
* This implementation only uses a nibble out of every byte of
* WWN, but this is what the kernel does, and it's nice for our