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-rw-r--r--zbd.c971
1 files changed, 971 insertions, 0 deletions
diff --git a/zbd.c b/zbd.c
new file mode 100644
index 00000000..42487780
--- /dev/null
+++ b/zbd.c
@@ -0,0 +1,971 @@
+/*
+ * Copyright (C) 2018 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 <linux/blkzoned.h>
+#include "file.h"
+#include "fio.h"
+#include "lib/pow2.h"
+#include "log.h"
+#include "smalloc.h"
+#include "verify.h"
+#include "zbd.h"
+
+/**
+ * zbd_zone_idx - convert an offset into a zone number
+ * @f: file pointer.
+ * @offset: offset in bytes. If this offset is in the first zone_size bytes
+ * past the disk size then the index of the sentinel is returned.
+ */
+static uint32_t zbd_zone_idx(const struct fio_file *f, uint64_t offset)
+{
+ uint32_t zone_idx;
+
+ if (f->zbd_info->zone_size_log2)
+ zone_idx = offset >> f->zbd_info->zone_size_log2;
+ else
+ zone_idx = (offset >> 9) / f->zbd_info->zone_size;
+
+ return min(zone_idx, f->zbd_info->nr_zones);
+}
+
+/**
+ * zbd_zone_full - verify whether a minimum number of bytes remain in a zone
+ * @f: file pointer.
+ * @z: zone info pointer.
+ * @required: minimum number of bytes that must remain in a zone.
+ *
+ * The caller must hold z->mutex.
+ */
+static bool zbd_zone_full(const struct fio_file *f, struct fio_zone_info *z,
+ uint64_t required)
+{
+ assert((required & 511) == 0);
+
+ return z->type == BLK_ZONE_TYPE_SEQWRITE_REQ &&
+ z->wp + (required >> 9) > z->start + f->zbd_info->zone_size;
+}
+
+static bool is_valid_offset(const struct fio_file *f, uint64_t offset)
+{
+ return (uint64_t)(offset - f->file_offset) < f->io_size;
+}
+
+/* Verify whether direct I/O is used for all host-managed zoned drives. */
+static bool zbd_using_direct_io(void)
+{
+ struct thread_data *td;
+ struct fio_file *f;
+ int i, j;
+
+ for_each_td(td, i) {
+ if (td->o.odirect || !(td->o.td_ddir & TD_DDIR_WRITE))
+ continue;
+ for_each_file(td, f, j) {
+ if (f->zbd_info &&
+ f->zbd_info->model == ZBD_DM_HOST_MANAGED)
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/* Whether or not the I/O range for f includes one or more sequential zones */
+static bool zbd_is_seq_job(struct fio_file *f)
+{
+ uint32_t zone_idx, zone_idx_b, zone_idx_e;
+
+ assert(f->zbd_info);
+ if (f->io_size == 0)
+ return false;
+ zone_idx_b = zbd_zone_idx(f, f->file_offset);
+ zone_idx_e = zbd_zone_idx(f, f->file_offset + f->io_size - 1);
+ for (zone_idx = zone_idx_b; zone_idx <= zone_idx_e; zone_idx++)
+ if (f->zbd_info->zone_info[zone_idx].type ==
+ BLK_ZONE_TYPE_SEQWRITE_REQ)
+ return true;
+
+ return false;
+}
+
+/*
+ * Verify whether offset and size parameters are aligned with zone boundaries.
+ */
+static bool zbd_verify_sizes(void)
+{
+ const struct fio_zone_info *z;
+ struct thread_data *td;
+ struct fio_file *f;
+ uint64_t new_offset, new_end;
+ uint32_t zone_idx;
+ int i, j;
+
+ for_each_td(td, i) {
+ for_each_file(td, f, j) {
+ if (!f->zbd_info)
+ continue;
+ if (f->file_offset >= f->real_file_size)
+ continue;
+ if (!zbd_is_seq_job(f))
+ continue;
+ zone_idx = zbd_zone_idx(f, f->file_offset);
+ z = &f->zbd_info->zone_info[zone_idx];
+ if (f->file_offset != (z->start << 9)) {
+ new_offset = (z+1)->start << 9;
+ if (new_offset >= f->file_offset + f->io_size) {
+ log_info("%s: io_size must be at least one zone\n",
+ f->file_name);
+ return false;
+ }
+ log_info("%s: rounded up offset from %lu to %lu\n",
+ f->file_name, f->file_offset,
+ new_offset);
+ f->io_size -= (new_offset - f->file_offset);
+ f->file_offset = new_offset;
+ }
+ zone_idx = zbd_zone_idx(f, f->file_offset + f->io_size);
+ z = &f->zbd_info->zone_info[zone_idx];
+ new_end = z->start << 9;
+ if (f->file_offset + f->io_size != new_end) {
+ if (new_end <= f->file_offset) {
+ log_info("%s: io_size must be at least one zone\n",
+ f->file_name);
+ return false;
+ }
+ log_info("%s: rounded down io_size from %lu to %lu\n",
+ f->file_name, f->io_size,
+ new_end - f->file_offset);
+ f->io_size = new_end - f->file_offset;
+ }
+ }
+ }
+
+ return true;
+}
+
+static bool zbd_verify_bs(void)
+{
+ struct thread_data *td;
+ struct fio_file *f;
+ uint32_t zone_size;
+ int i, j, k;
+
+ for_each_td(td, i) {
+ for_each_file(td, f, j) {
+ if (!f->zbd_info)
+ continue;
+ zone_size = f->zbd_info->zone_size;
+ for (k = 0; k < ARRAY_SIZE(td->o.bs); k++) {
+ if (td->o.verify != VERIFY_NONE &&
+ (zone_size << 9) % td->o.bs[k] != 0) {
+ log_info("%s: block size %llu is not a divisor of the zone size %d\n",
+ f->file_name, td->o.bs[k],
+ zone_size << 9);
+ return false;
+ }
+ }
+ }
+ }
+ return true;
+}
+
+/*
+ * Read zone information into @buf starting from sector @start_sector.
+ * @fd is a file descriptor that refers to a block device and @bufsz is the
+ * size of @buf.
+ *
+ * Returns 0 upon success and a negative error code upon failure.
+ */
+static int read_zone_info(int fd, uint64_t start_sector,
+ void *buf, unsigned int bufsz)
+{
+ struct blk_zone_report *hdr = buf;
+
+ if (bufsz < sizeof(*hdr))
+ return -EINVAL;
+
+ memset(hdr, 0, sizeof(*hdr));
+
+ hdr->nr_zones = (bufsz - sizeof(*hdr)) / sizeof(struct blk_zone);
+ hdr->sector = start_sector;
+ return ioctl(fd, BLKREPORTZONE, hdr) >= 0 ? 0 : -errno;
+}
+
+/*
+ * 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);
+}
+
+static enum blk_zoned_model get_zbd_model(const char *file_name)
+{
+ enum blk_zoned_model model = ZBD_DM_NONE;
+ char *zoned_attr_path = NULL;
+ char *model_str = NULL;
+ struct stat statbuf;
+
+ if (stat(file_name, &statbuf) < 0)
+ goto out;
+ if (asprintf(&zoned_attr_path, "/sys/dev/block/%d:%d/queue/zoned",
+ major(statbuf.st_rdev), minor(statbuf.st_rdev)) < 0)
+ goto out;
+ model_str = read_file(zoned_attr_path);
+ if (!model_str)
+ goto out;
+ dprint(FD_ZBD, "%s: zbd model string: %s\n", file_name, model_str);
+ if (strcmp(model_str, "host-aware") == 0)
+ model = ZBD_DM_HOST_AWARE;
+ else if (strcmp(model_str, "host-managed") == 0)
+ model = ZBD_DM_HOST_MANAGED;
+
+out:
+ free(model_str);
+ free(zoned_attr_path);
+ return model;
+}
+
+static int ilog2(uint64_t i)
+{
+ int log = -1;
+
+ while (i) {
+ i >>= 1;
+ log++;
+ }
+ return log;
+}
+
+/*
+ * Initialize f->zbd_info for devices that are not zoned block devices. This
+ * allows to execute a ZBD workload against a non-ZBD device.
+ */
+static int init_zone_info(struct thread_data *td, struct fio_file *f)
+{
+ uint32_t nr_zones;
+ struct fio_zone_info *p;
+ uint64_t zone_size;
+ struct zoned_block_device_info *zbd_info = NULL;
+ pthread_mutexattr_t attr;
+ int i;
+
+ zone_size = td->o.zone_size >> 9;
+ assert(zone_size);
+ nr_zones = ((f->real_file_size >> 9) + zone_size - 1) / zone_size;
+ zbd_info = scalloc(1, sizeof(*zbd_info) +
+ (nr_zones + 1) * sizeof(zbd_info->zone_info[0]));
+ if (!zbd_info)
+ return -ENOMEM;
+
+ pthread_mutexattr_init(&attr);
+ pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+ pthread_mutexattr_setpshared(&attr, true);
+ pthread_mutex_init(&zbd_info->mutex, &attr);
+ zbd_info->refcount = 1;
+ p = &zbd_info->zone_info[0];
+ for (i = 0; i < nr_zones; i++, p++) {
+ pthread_mutex_init(&p->mutex, &attr);
+ p->start = i * zone_size;
+ p->wp = p->start + zone_size;
+ p->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
+ p->cond = BLK_ZONE_COND_EMPTY;
+ }
+ /* a sentinel */
+ p->start = nr_zones * zone_size;
+
+ f->zbd_info = zbd_info;
+ f->zbd_info->zone_size = zone_size;
+ f->zbd_info->zone_size_log2 = is_power_of_2(zone_size) ?
+ ilog2(zone_size) + 9 : -1;
+ f->zbd_info->nr_zones = nr_zones;
+ pthread_mutexattr_destroy(&attr);
+ return 0;
+}
+
+/*
+ * Parse the BLKREPORTZONE output and store it in f->zbd_info. Must be called
+ * only for devices that support this ioctl, namely zoned block devices.
+ */
+static int parse_zone_info(struct thread_data *td, struct fio_file *f)
+{
+ const unsigned int bufsz = sizeof(struct blk_zone_report) +
+ 4096 * sizeof(struct blk_zone);
+ uint32_t nr_zones;
+ struct blk_zone_report *hdr;
+ const struct blk_zone *z;
+ struct fio_zone_info *p;
+ uint64_t zone_size, start_sector;
+ struct zoned_block_device_info *zbd_info = NULL;
+ pthread_mutexattr_t attr;
+ void *buf;
+ int fd, i, j, ret = 0;
+
+ pthread_mutexattr_init(&attr);
+ pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+ pthread_mutexattr_setpshared(&attr, true);
+
+ buf = malloc(bufsz);
+ if (!buf)
+ goto out;
+
+ fd = open(f->file_name, O_RDONLY | O_LARGEFILE);
+ if (fd < 0) {
+ ret = -errno;
+ goto free;
+ }
+
+ ret = read_zone_info(fd, 0, buf, bufsz);
+ if (ret < 0) {
+ log_info("fio: BLKREPORTZONE(%lu) failed for %s (%d).\n",
+ 0UL, f->file_name, -ret);
+ goto close;
+ }
+ hdr = buf;
+ if (hdr->nr_zones < 1) {
+ log_info("fio: %s has invalid zone information.\n",
+ f->file_name);
+ goto close;
+ }
+ z = (void *)(hdr + 1);
+ zone_size = z->len;
+ nr_zones = ((f->real_file_size >> 9) + zone_size - 1) / zone_size;
+
+ if (td->o.zone_size == 0) {
+ td->o.zone_size = zone_size << 9;
+ } else if (td->o.zone_size != zone_size << 9) {
+ log_info("fio: %s job parameter zonesize %lld does not match disk zone size %ld.\n",
+ f->file_name, td->o.zone_size, zone_size << 9);
+ ret = -EINVAL;
+ goto close;
+ }
+
+ dprint(FD_ZBD, "Device %s has %d zones of size %lu KB\n", f->file_name,
+ nr_zones, zone_size / 2);
+
+ zbd_info = scalloc(1, sizeof(*zbd_info) +
+ (nr_zones + 1) * sizeof(zbd_info->zone_info[0]));
+ ret = -ENOMEM;
+ if (!zbd_info)
+ goto close;
+ pthread_mutex_init(&zbd_info->mutex, &attr);
+ zbd_info->refcount = 1;
+ p = &zbd_info->zone_info[0];
+ for (start_sector = 0, j = 0; j < nr_zones;) {
+ z = (void *)(hdr + 1);
+ for (i = 0; i < hdr->nr_zones; i++, j++, z++, p++) {
+ pthread_mutex_init(&p->mutex, &attr);
+ p->start = z->start;
+ switch (z->cond) {
+ case BLK_ZONE_COND_NOT_WP:
+ p->wp = z->start;
+ break;
+ case BLK_ZONE_COND_FULL:
+ p->wp = z->start + zone_size;
+ break;
+ default:
+ assert(z->start <= z->wp);
+ assert(z->wp <= z->start + zone_size);
+ p->wp = z->wp;
+ break;
+ }
+ p->type = z->type;
+ p->cond = z->cond;
+ if (j > 0 && p->start != p[-1].start + zone_size) {
+ log_info("%s: invalid zone data\n",
+ f->file_name);
+ ret = -EINVAL;
+ goto close;
+ }
+ }
+ z--;
+ start_sector = z->start + z->len;
+ if (j >= nr_zones)
+ break;
+ ret = read_zone_info(fd, start_sector, buf, bufsz);
+ if (ret < 0) {
+ log_info("fio: BLKREPORTZONE(%lu) failed for %s (%d).\n",
+ start_sector, f->file_name, -ret);
+ goto close;
+ }
+ }
+ /* a sentinel */
+ zbd_info->zone_info[nr_zones].start = start_sector;
+
+ f->zbd_info = zbd_info;
+ f->zbd_info->zone_size = zone_size;
+ f->zbd_info->zone_size_log2 = is_power_of_2(zone_size) ?
+ ilog2(zone_size) + 9 : -1;
+ f->zbd_info->nr_zones = nr_zones;
+ zbd_info = NULL;
+ ret = 0;
+
+close:
+ sfree(zbd_info);
+ close(fd);
+free:
+ free(buf);
+out:
+ pthread_mutexattr_destroy(&attr);
+ return ret;
+}
+
+/*
+ * Allocate zone information and store it into f->zbd_info if zonemode=zbd.
+ *
+ * Returns 0 upon success and a negative error code upon failure.
+ */
+int zbd_create_zone_info(struct thread_data *td, struct fio_file *f)
+{
+ enum blk_zoned_model zbd_model;
+ int ret = 0;
+
+ assert(td->o.zone_mode == ZONE_MODE_ZBD);
+
+ zbd_model = get_zbd_model(f->file_name);
+ switch (zbd_model) {
+ case ZBD_DM_HOST_AWARE:
+ case ZBD_DM_HOST_MANAGED:
+ ret = parse_zone_info(td, f);
+ break;
+ case ZBD_DM_NONE:
+ ret = init_zone_info(td, f);
+ break;
+ }
+ if (ret == 0)
+ f->zbd_info->model = zbd_model;
+ return ret;
+}
+
+void zbd_free_zone_info(struct fio_file *f)
+{
+ uint32_t refcount;
+
+ if (!f->zbd_info)
+ return;
+
+ pthread_mutex_lock(&f->zbd_info->mutex);
+ refcount = --f->zbd_info->refcount;
+ pthread_mutex_unlock(&f->zbd_info->mutex);
+
+ assert((int32_t)refcount >= 0);
+ if (refcount == 0)
+ sfree(f->zbd_info);
+ f->zbd_info = NULL;
+}
+
+/*
+ * Initialize f->zbd_info.
+ *
+ * Returns 0 upon success and a negative error code upon failure.
+ *
+ * Note: this function can only work correctly if it is called before the first
+ * fio fork() call.
+ */
+static int zbd_init_zone_info(struct thread_data *td, struct fio_file *file)
+{
+ struct thread_data *td2;
+ struct fio_file *f2;
+ int i, j, ret;
+
+ for_each_td(td2, i) {
+ for_each_file(td2, f2, j) {
+ if (td2 == td && f2 == file)
+ continue;
+ if (!f2->zbd_info ||
+ strcmp(f2->file_name, file->file_name) != 0)
+ continue;
+ file->zbd_info = f2->zbd_info;
+ file->zbd_info->refcount++;
+ return 0;
+ }
+ }
+
+ ret = zbd_create_zone_info(td, file);
+ if (ret < 0)
+ td_verror(td, -ret, "BLKREPORTZONE failed");
+ return ret;
+}
+
+int zbd_init(struct thread_data *td)
+{
+ struct fio_file *f;
+ int i;
+
+ for_each_file(td, f, i) {
+ if (f->filetype != FIO_TYPE_BLOCK)
+ continue;
+ if (td->o.zone_size && td->o.zone_size < 512) {
+ log_err("%s: zone size must be at least 512 bytes for --zonemode=zbd\n\n",
+ f->file_name);
+ return 1;
+ }
+ if (td->o.zone_size == 0 &&
+ get_zbd_model(f->file_name) == ZBD_DM_NONE) {
+ log_err("%s: Specifying the zone size is mandatory for regular block devices with --zonemode=zbd\n\n",
+ f->file_name);
+ return 1;
+ }
+ zbd_init_zone_info(td, f);
+ }
+
+ if (!zbd_using_direct_io()) {
+ log_err("Using direct I/O is mandatory for writing to ZBD drives\n\n");
+ return 1;
+ }
+
+ if (!zbd_verify_sizes())
+ return 1;
+
+ if (!zbd_verify_bs())
+ return 1;
+
+ return 0;
+}
+
+/**
+ * zbd_reset_range - reset zones for a range of sectors
+ * @td: FIO thread data.
+ * @f: Fio file for which to reset zones
+ * @sector: Starting sector in units of 512 bytes
+ * @nr_sectors: Number of sectors in units of 512 bytes
+ *
+ * Returns 0 upon success and a negative error code upon failure.
+ */
+static int zbd_reset_range(struct thread_data *td, const struct fio_file *f,
+ uint64_t sector, uint64_t nr_sectors)
+{
+ struct blk_zone_range zr = {
+ .sector = sector,
+ .nr_sectors = nr_sectors,
+ };
+ uint32_t zone_idx_b, zone_idx_e;
+ struct fio_zone_info *zb, *ze, *z;
+ int ret = 0;
+
+ assert(f->fd != -1);
+ assert(is_valid_offset(f, ((sector + nr_sectors) << 9) - 1));
+ switch (f->zbd_info->model) {
+ case ZBD_DM_HOST_AWARE:
+ case ZBD_DM_HOST_MANAGED:
+ ret = ioctl(f->fd, BLKRESETZONE, &zr);
+ if (ret < 0) {
+ td_verror(td, errno, "resetting wp failed");
+ log_err("%s: resetting wp for %llu sectors at sector %llu failed (%d).\n",
+ f->file_name, zr.nr_sectors, zr.sector, errno);
+ return ret;
+ }
+ break;
+ case ZBD_DM_NONE:
+ break;
+ }
+
+ zone_idx_b = zbd_zone_idx(f, sector << 9);
+ zb = &f->zbd_info->zone_info[zone_idx_b];
+ zone_idx_e = zbd_zone_idx(f, (sector + nr_sectors) << 9);
+ ze = &f->zbd_info->zone_info[zone_idx_e];
+ for (z = zb; z < ze; z++) {
+ pthread_mutex_lock(&z->mutex);
+ z->wp = z->start;
+ z->verify_block = 0;
+ pthread_mutex_unlock(&z->mutex);
+ }
+
+ return ret;
+}
+
+/**
+ * zbd_reset_zone - reset the write pointer of a single zone
+ * @td: FIO thread data.
+ * @f: FIO file associated with the disk for which to reset a write pointer.
+ * @z: Zone to reset.
+ *
+ * Returns 0 upon success and a negative error code upon failure.
+ */
+static int zbd_reset_zone(struct thread_data *td, const struct fio_file *f,
+ struct fio_zone_info *z)
+{
+ int ret;
+
+ dprint(FD_ZBD, "%s: resetting wp of zone %lu.\n", f->file_name,
+ z - f->zbd_info->zone_info);
+ ret = zbd_reset_range(td, f, z->start, (z+1)->start - z->start);
+ return ret;
+}
+
+/*
+ * Reset a range of zones. Returns 0 upon success and 1 upon failure.
+ * @td: fio thread data.
+ * @f: fio file for which to reset zones
+ * @zb: first zone to reset.
+ * @ze: first zone not to reset.
+ * @all_zones: whether to reset all zones or only those zones for which the
+ * write pointer is not a multiple of td->o.min_bs[DDIR_WRITE].
+ */
+static int zbd_reset_zones(struct thread_data *td, struct fio_file *f,
+ struct fio_zone_info *const zb,
+ struct fio_zone_info *const ze, bool all_zones)
+{
+ struct fio_zone_info *z, *start_z = ze;
+ const uint32_t min_bs = td->o.min_bs[DDIR_WRITE] >> 9;
+ bool reset_wp;
+ int res = 0;
+
+ dprint(FD_ZBD, "%s: examining zones %lu .. %lu\n", f->file_name,
+ zb - f->zbd_info->zone_info, ze - f->zbd_info->zone_info);
+ assert(f->fd != -1);
+ for (z = zb; z < ze; z++) {
+ pthread_mutex_lock(&z->mutex);
+ switch (z->type) {
+ case BLK_ZONE_TYPE_SEQWRITE_REQ:
+ reset_wp = all_zones ? z->wp != z->start :
+ (td->o.td_ddir & TD_DDIR_WRITE) &&
+ z->wp % min_bs != 0;
+ if (start_z == ze && reset_wp) {
+ start_z = z;
+ } else if (start_z < ze && !reset_wp) {
+ dprint(FD_ZBD,
+ "%s: resetting zones %lu .. %lu\n",
+ f->file_name,
+ start_z - f->zbd_info->zone_info,
+ z - f->zbd_info->zone_info);
+ if (zbd_reset_range(td, f, start_z->start,
+ z->start - start_z->start) < 0)
+ res = 1;
+ start_z = ze;
+ }
+ break;
+ default:
+ if (start_z == ze)
+ break;
+ dprint(FD_ZBD, "%s: resetting zones %lu .. %lu\n",
+ f->file_name, start_z - f->zbd_info->zone_info,
+ z - f->zbd_info->zone_info);
+ if (zbd_reset_range(td, f, start_z->start,
+ z->start - start_z->start) < 0)
+ res = 1;
+ start_z = ze;
+ break;
+ }
+ }
+ if (start_z < ze) {
+ dprint(FD_ZBD, "%s: resetting zones %lu .. %lu\n", f->file_name,
+ start_z - f->zbd_info->zone_info,
+ z - f->zbd_info->zone_info);
+ if (zbd_reset_range(td, f, start_z->start,
+ z->start - start_z->start) < 0)
+ res = 1;
+ }
+ for (z = zb; z < ze; z++)
+ pthread_mutex_unlock(&z->mutex);
+
+ return res;
+}
+
+void zbd_file_reset(struct thread_data *td, struct fio_file *f)
+{
+ struct fio_zone_info *zb, *ze;
+ uint32_t zone_idx_e;
+
+ if (!f->zbd_info)
+ return;
+
+ zb = &f->zbd_info->zone_info[zbd_zone_idx(f, f->file_offset)];
+ zone_idx_e = zbd_zone_idx(f, f->file_offset + f->io_size);
+ ze = &f->zbd_info->zone_info[zone_idx_e];
+ /*
+ * If data verification is enabled reset the affected zones before
+ * writing any data to avoid that a zone reset has to be issued while
+ * writing data, which causes data loss.
+ */
+ zbd_reset_zones(td, f, zb, ze, td->o.verify != VERIFY_NONE &&
+ (td->o.td_ddir & TD_DDIR_WRITE) &&
+ td->runstate != TD_VERIFYING);
+}
+
+/* The caller must hold z->mutex. */
+static void zbd_replay_write_order(struct thread_data *td, struct io_u *io_u,
+ struct fio_zone_info *z)
+{
+ const struct fio_file *f = io_u->file;
+ const uint32_t min_bs = td->o.min_bs[DDIR_WRITE];
+
+ if (z->verify_block * min_bs >= f->zbd_info->zone_size)
+ log_err("%s: %d * %d >= %ld\n", f->file_name, z->verify_block,
+ min_bs, f->zbd_info->zone_size);
+ io_u->offset = (z->start << 9) + z->verify_block++ * min_bs;
+}
+
+/*
+ * Find another zone for which @io_u fits below the write pointer. Start
+ * searching in zones @zb + 1 .. @zl and continue searching in zones
+ * @zf .. @zb - 1.
+ *
+ * Either returns NULL or returns a zone pointer and holds the mutex for that
+ * zone.
+ */
+static struct fio_zone_info *
+zbd_find_zone(struct thread_data *td, struct io_u *io_u,
+ struct fio_zone_info *zb, struct fio_zone_info *zl)
+{
+ const uint32_t min_bs = td->o.min_bs[io_u->ddir];
+ const struct fio_file *f = io_u->file;
+ struct fio_zone_info *z1, *z2;
+ const struct fio_zone_info *const zf =
+ &f->zbd_info->zone_info[zbd_zone_idx(f, f->file_offset)];
+
+ /*
+ * Skip to the next non-empty zone in case of sequential I/O and to
+ * the nearest non-empty zone in case of random I/O.
+ */
+ for (z1 = zb + 1, z2 = zb - 1; z1 < zl || z2 >= zf; z1++, z2--) {
+ if (z1 < zl && z1->cond != BLK_ZONE_COND_OFFLINE) {
+ pthread_mutex_lock(&z1->mutex);
+ if (z1->start + (min_bs >> 9) <= z1->wp)
+ return z1;
+ pthread_mutex_unlock(&z1->mutex);
+ } else if (!td_random(td)) {
+ break;
+ }
+ if (td_random(td) && z2 >= zf &&
+ z2->cond != BLK_ZONE_COND_OFFLINE) {
+ pthread_mutex_lock(&z2->mutex);
+ if (z2->start + (min_bs >> 9) <= z2->wp)
+ return z2;
+ pthread_mutex_unlock(&z2->mutex);
+ }
+ }
+ dprint(FD_ZBD, "%s: adjusting random read offset failed\n",
+ f->file_name);
+ return NULL;
+}
+
+
+/**
+ * zbd_post_submit - update the write pointer and unlock the zone lock
+ * @io_u: I/O unit
+ * @success: Whether or not the I/O unit has been executed successfully
+ *
+ * For write and trim operations, update the write pointer of all affected
+ * zones.
+ */
+static void zbd_post_submit(const struct io_u *io_u, bool success)
+{
+ struct zoned_block_device_info *zbd_info;
+ struct fio_zone_info *z;
+ uint32_t zone_idx;
+ uint64_t end, zone_end;
+
+ zbd_info = io_u->file->zbd_info;
+ if (!zbd_info)
+ return;
+
+ zone_idx = zbd_zone_idx(io_u->file, io_u->offset);
+ end = (io_u->offset + io_u->buflen) >> 9;
+ z = &zbd_info->zone_info[zone_idx];
+ assert(zone_idx < zbd_info->nr_zones);
+ if (z->type != BLK_ZONE_TYPE_SEQWRITE_REQ)
+ return;
+ if (!success)
+ goto unlock;
+ switch (io_u->ddir) {
+ case DDIR_WRITE:
+ zone_end = min(end, (z + 1)->start);
+ z->wp = zone_end;
+ break;
+ case DDIR_TRIM:
+ assert(z->wp == z->start);
+ break;
+ default:
+ break;
+ }
+unlock:
+ pthread_mutex_unlock(&z->mutex);
+}
+
+bool zbd_unaligned_write(int error_code)
+{
+ switch (error_code) {
+ case EIO:
+ case EREMOTEIO:
+ return true;
+ }
+ return false;
+}
+
+/**
+ * zbd_adjust_block - adjust the offset and length as necessary for ZBD drives
+ * @td: FIO thread data.
+ * @io_u: FIO I/O unit.
+ *
+ * Locking strategy: returns with z->mutex locked if and only if z refers
+ * to a sequential zone and if io_u_accept is returned. z is the zone that
+ * corresponds to io_u->offset at the end of this function.
+ */
+enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u)
+{
+ const struct fio_file *f = io_u->file;
+ uint32_t zone_idx_b;
+ struct fio_zone_info *zb, *zl;
+ uint32_t orig_len = io_u->buflen;
+ uint32_t min_bs = td->o.min_bs[io_u->ddir];
+ uint64_t new_len;
+ int64_t range;
+
+ if (!f->zbd_info)
+ return io_u_accept;
+
+ assert(is_valid_offset(f, io_u->offset));
+ assert(io_u->buflen);
+ zone_idx_b = zbd_zone_idx(f, io_u->offset);
+ zb = &f->zbd_info->zone_info[zone_idx_b];
+
+ /* Accept the I/O offset for conventional zones. */
+ if (zb->type == BLK_ZONE_TYPE_CONVENTIONAL)
+ return io_u_accept;
+
+ /*
+ * Accept the I/O offset for reads if reading beyond the write pointer
+ * is enabled.
+ */
+ if (zb->cond != BLK_ZONE_COND_OFFLINE &&
+ io_u->ddir == DDIR_READ && td->o.read_beyond_wp)
+ return io_u_accept;
+
+ pthread_mutex_lock(&zb->mutex);
+ switch (io_u->ddir) {
+ case DDIR_READ:
+ if (td->runstate == TD_VERIFYING) {
+ zbd_replay_write_order(td, io_u, zb);
+ goto accept;
+ }
+ /*
+ * Avoid reads past the write pointer because such reads do not
+ * hit the medium.
+ */
+ range = zb->cond != BLK_ZONE_COND_OFFLINE ?
+ ((zb->wp - zb->start) << 9) - io_u->buflen : 0;
+ if (td_random(td) && range >= 0) {
+ io_u->offset = (zb->start << 9) +
+ ((io_u->offset - (zb->start << 9)) %
+ (range + 1)) / min_bs * min_bs;
+ assert(zb->start << 9 <= io_u->offset);
+ assert(io_u->offset + io_u->buflen <= zb->wp << 9);
+ goto accept;
+ }
+ if (zb->cond == BLK_ZONE_COND_OFFLINE ||
+ (io_u->offset + io_u->buflen) >> 9 > zb->wp) {
+ pthread_mutex_unlock(&zb->mutex);
+ zl = &f->zbd_info->zone_info[zbd_zone_idx(f,
+ f->file_offset + f->io_size)];
+ zb = zbd_find_zone(td, io_u, zb, zl);
+ if (!zb) {
+ dprint(FD_ZBD,
+ "%s: zbd_find_zone(%lld, %llu) failed\n",
+ f->file_name, io_u->offset,
+ io_u->buflen);
+ goto eof;
+ }
+ io_u->offset = zb->start << 9;
+ }
+ if ((io_u->offset + io_u->buflen) >> 9 > zb->wp) {
+ dprint(FD_ZBD, "%s: %lld + %lld > %" PRIu64 "\n",
+ f->file_name, io_u->offset, io_u->buflen,
+ zb->wp);
+ goto eof;
+ }
+ goto accept;
+ case DDIR_WRITE:
+ if (io_u->buflen > (f->zbd_info->zone_size << 9))
+ goto eof;
+ /* Reset the zone pointer if necessary */
+ if (zb->reset_zone || zbd_zone_full(f, zb, min_bs)) {
+ assert(td->o.verify == VERIFY_NONE);
+ /*
+ * Since previous write requests may have been submitted
+ * asynchronously and since we will submit the zone
+ * reset synchronously, wait until previously submitted
+ * write requests have completed before issuing a
+ * zone reset.
+ */
+ io_u_quiesce(td);
+ zb->reset_zone = 0;
+ if (zbd_reset_zone(td, f, zb) < 0)
+ goto eof;
+ }
+ /* Make writes occur at the write pointer */
+ assert(!zbd_zone_full(f, zb, min_bs));
+ io_u->offset = zb->wp << 9;
+ if (!is_valid_offset(f, io_u->offset)) {
+ dprint(FD_ZBD, "Dropped request with offset %llu\n",
+ io_u->offset);
+ goto eof;
+ }
+ /*
+ * Make sure that the buflen is a multiple of the minimal
+ * block size. Give up if shrinking would make the request too
+ * small.
+ */
+ new_len = min((unsigned long long)io_u->buflen,
+ ((zb + 1)->start << 9) - io_u->offset);
+ new_len = new_len / min_bs * min_bs;
+ if (new_len == io_u->buflen)
+ goto accept;
+ if (new_len >= min_bs) {
+ io_u->buflen = new_len;
+ dprint(FD_IO, "Changed length from %u into %llu\n",
+ orig_len, io_u->buflen);
+ goto accept;
+ }
+ log_err("Zone remainder %lld smaller than minimum block size %d\n",
+ (((zb + 1)->start << 9) - io_u->offset),
+ min_bs);
+ goto eof;
+ case DDIR_TRIM:
+ /* fall-through */
+ case DDIR_SYNC:
+ case DDIR_DATASYNC:
+ case DDIR_SYNC_FILE_RANGE:
+ case DDIR_WAIT:
+ case DDIR_LAST:
+ case DDIR_INVAL:
+ goto accept;
+ }
+
+ assert(false);
+
+accept:
+ assert(zb);
+ assert(zb->cond != BLK_ZONE_COND_OFFLINE);
+ assert(!io_u->post_submit);
+ io_u->post_submit = zbd_post_submit;
+ return io_u_accept;
+
+eof:
+ if (zb)
+ pthread_mutex_unlock(&zb->mutex);
+ return io_u_eof;
+}