X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=zbd.c;h=0f3636a525d835a1514de71a9f652729105cfaff;hp=2bf352122bf1dfae08c9cbb8a97f7f22ca2ace4a;hb=d5bb0a8902b787718e7027be85573773781f0898;hpb=59b0754458f601779fac99f4f9dc95d54e1ab976

diff --git a/zbd.c b/zbd.c
index 2bf35212..0f3636a5 100644
--- a/zbd.c
+++ b/zbd.c
@@ -31,10 +31,10 @@ 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)
+	if (f->zbd_info->zone_size_log2 > 0)
 		zone_idx = offset >> f->zbd_info->zone_size_log2;
 	else
-		zone_idx = (offset >> 9) / f->zbd_info->zone_size;
+		zone_idx = offset / f->zbd_info->zone_size;
 
 	return min(zone_idx, f->zbd_info->nr_zones);
 }
@@ -53,7 +53,7 @@ static bool zbd_zone_full(const struct fio_file *f, struct fio_zone_info *z,
 	assert((required & 511) == 0);
 
 	return z->type == BLK_ZONE_TYPE_SEQWRITE_REQ &&
-		z->wp + (required >> 9) > z->start + f->zbd_info->zone_size;
+		z->wp + required > z->start + f->zbd_info->zone_size;
 }
 
 static bool is_valid_offset(const struct fio_file *f, uint64_t offset)
@@ -121,8 +121,8 @@ static bool zbd_verify_sizes(void)
 				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 (f->file_offset != z->start) {
+				new_offset = (z+1)->start;
 				if (new_offset >= f->file_offset + f->io_size) {
 					log_info("%s: io_size must be at least one zone\n",
 						 f->file_name);
@@ -136,7 +136,7 @@ static bool zbd_verify_sizes(void)
 			}
 			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;
+			new_end = z->start;
 			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",
@@ -168,10 +168,10 @@ static bool zbd_verify_bs(void)
 			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) {
+				    zone_size % 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);
+						 zone_size);
 					return false;
 				}
 			}
@@ -273,9 +273,9 @@ static int init_zone_info(struct thread_data *td, struct fio_file *f)
 	pthread_mutexattr_t attr;
 	int i;
 
-	zone_size = td->o.zone_size >> 9;
+	zone_size = td->o.zone_size;
 	assert(zone_size);
-	nr_zones = ((f->real_file_size >> 9) + zone_size - 1) / zone_size;
+	nr_zones = (f->real_file_size + zone_size - 1) / zone_size;
 	zbd_info = scalloc(1, sizeof(*zbd_info) +
 			   (nr_zones + 1) * sizeof(zbd_info->zone_info[0]));
 	if (!zbd_info)
@@ -300,7 +300,7 @@ static int init_zone_info(struct thread_data *td, struct fio_file *f)
 	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;
+		ilog2(zone_size) : -1;
 	f->zbd_info->nr_zones = nr_zones;
 	pthread_mutexattr_destroy(&attr);
 	return 0;
@@ -351,20 +351,20 @@ static int parse_zone_info(struct thread_data *td, struct fio_file *f)
 		goto close;
 	}
 	z = (void *)(hdr + 1);
-	zone_size = z->len;
-	nr_zones = ((f->real_file_size >> 9) + zone_size - 1) / zone_size;
+	zone_size = z->len << 9;
+	nr_zones = (f->real_file_size + 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) {
+		td->o.zone_size = zone_size;
+	} else if (td->o.zone_size != zone_size) {
 		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);
+			 f->file_name, td->o.zone_size, zone_size);
 		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);
+	       nr_zones, zone_size / 1024);
 
 	zbd_info = scalloc(1, sizeof(*zbd_info) +
 			   (nr_zones + 1) * sizeof(zbd_info->zone_info[0]));
@@ -378,18 +378,18 @@ static int parse_zone_info(struct thread_data *td, struct fio_file *f)
 		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;
+			p->start = z->start << 9;
 			switch (z->cond) {
 			case BLK_ZONE_COND_NOT_WP:
-				p->wp = z->start;
+				p->wp = p->start;
 				break;
 			case BLK_ZONE_COND_FULL:
-				p->wp = z->start + zone_size;
+				p->wp = p->start + zone_size;
 				break;
 			default:
 				assert(z->start <= z->wp);
-				assert(z->wp <= z->start + zone_size);
-				p->wp = z->wp;
+				assert(z->wp <= z->start + (zone_size >> 9));
+				p->wp = z->wp << 9;
 				break;
 			}
 			p->type = z->type;
@@ -413,12 +413,12 @@ static int parse_zone_info(struct thread_data *td, struct fio_file *f)
 		}
 	}
 	/* a sentinel */
-	zbd_info->zone_info[nr_zones].start = start_sector;
+	zbd_info->zone_info[nr_zones].start = start_sector << 9;
 
 	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;
+		ilog2(zone_size) : -1;
 	f->zbd_info->nr_zones = nr_zones;
 	zbd_info = NULL;
 	ret = 0;
@@ -556,18 +556,18 @@ int zbd_init(struct thread_data *td)
  * 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)
+			   uint64_t offset, uint64_t length)
 {
 	struct blk_zone_range zr = {
-		.sector         = sector,
-		.nr_sectors     = nr_sectors,
+		.sector         = offset >> 9,
+		.nr_sectors     = length >> 9,
 	};
 	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));
+	assert(is_valid_offset(f, offset + length - 1));
 	switch (f->zbd_info->model) {
 	case ZBD_DM_HOST_AWARE:
 	case ZBD_DM_HOST_MANAGED:
@@ -583,12 +583,15 @@ static int zbd_reset_range(struct thread_data *td, const struct fio_file *f,
 		break;
 	}
 
-	zone_idx_b = zbd_zone_idx(f, sector << 9);
+	zone_idx_b = zbd_zone_idx(f, offset);
 	zb = &f->zbd_info->zone_info[zone_idx_b];
-	zone_idx_e = zbd_zone_idx(f, (sector + nr_sectors) << 9);
+	zone_idx_e = zbd_zone_idx(f, offset + length);
 	ze = &f->zbd_info->zone_info[zone_idx_e];
 	for (z = zb; z < ze; z++) {
 		pthread_mutex_lock(&z->mutex);
+		pthread_mutex_lock(&f->zbd_info->mutex);
+		f->zbd_info->sectors_with_data -= z->wp - z->start;
+		pthread_mutex_unlock(&f->zbd_info->mutex);
 		z->wp = z->start;
 		z->verify_block = 0;
 		pthread_mutex_unlock(&z->mutex);
@@ -632,7 +635,7 @@ static int zbd_reset_zones(struct thread_data *td, struct fio_file *f,
 			   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;
+	const uint32_t min_bs = td->o.min_bs[DDIR_WRITE];
 	bool reset_wp;
 	int res = 0;
 
@@ -687,10 +690,65 @@ static int zbd_reset_zones(struct thread_data *td, struct fio_file *f,
 	return res;
 }
 
+/*
+ * Reset zbd_info.write_cnt, the counter that counts down towards the next
+ * zone reset.
+ */
+static void zbd_reset_write_cnt(const struct thread_data *td,
+				const struct fio_file *f)
+{
+	assert(0 <= td->o.zrf.u.f && td->o.zrf.u.f <= 1);
+
+	pthread_mutex_lock(&f->zbd_info->mutex);
+	f->zbd_info->write_cnt = td->o.zrf.u.f ?
+		min(1.0 / td->o.zrf.u.f, 0.0 + UINT_MAX) : UINT_MAX;
+	pthread_mutex_unlock(&f->zbd_info->mutex);
+}
+
+static bool zbd_dec_and_reset_write_cnt(const struct thread_data *td,
+					const struct fio_file *f)
+{
+	uint32_t write_cnt = 0;
+
+	pthread_mutex_lock(&f->zbd_info->mutex);
+	assert(f->zbd_info->write_cnt);
+	if (f->zbd_info->write_cnt)
+		write_cnt = --f->zbd_info->write_cnt;
+	if (write_cnt == 0)
+		zbd_reset_write_cnt(td, f);
+	pthread_mutex_unlock(&f->zbd_info->mutex);
+
+	return write_cnt == 0;
+}
+
+/* Check whether the value of zbd_info.sectors_with_data is correct. */
+static void check_swd(const struct thread_data *td, const struct fio_file *f)
+{
+#if 0
+	struct fio_zone_info *zb, *ze, *z;
+	uint64_t swd;
+
+	zb = &f->zbd_info->zone_info[zbd_zone_idx(f, f->file_offset)];
+	ze = &f->zbd_info->zone_info[zbd_zone_idx(f, f->file_offset +
+						  f->io_size)];
+	swd = 0;
+	for (z = zb; z < ze; z++) {
+		pthread_mutex_lock(&z->mutex);
+		swd += z->wp - z->start;
+	}
+	pthread_mutex_lock(&f->zbd_info->mutex);
+	assert(f->zbd_info->sectors_with_data == swd);
+	pthread_mutex_unlock(&f->zbd_info->mutex);
+	for (z = zb; z < ze; z++)
+		pthread_mutex_unlock(&z->mutex);
+#endif
+}
+
 void zbd_file_reset(struct thread_data *td, struct fio_file *f)
 {
-	struct fio_zone_info *zb, *ze;
+	struct fio_zone_info *zb, *ze, *z;
 	uint32_t zone_idx_e;
+	uint64_t swd = 0;
 
 	if (!f->zbd_info)
 		return;
@@ -698,6 +756,16 @@ void zbd_file_reset(struct thread_data *td, struct fio_file *f)
 	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];
+	for (z = zb ; z < ze; z++) {
+		pthread_mutex_lock(&z->mutex);
+		swd += z->wp - z->start;
+	}
+	pthread_mutex_lock(&f->zbd_info->mutex);
+	f->zbd_info->sectors_with_data = swd;
+	pthread_mutex_unlock(&f->zbd_info->mutex);
+	for (z = zb ; z < ze; z++)
+		pthread_mutex_unlock(&z->mutex);
+	dprint(FD_ZBD, "%s(%s): swd = %ld\n", __func__, f->file_name, swd);
 	/*
 	 * If data verification is enabled reset the affected zones before
 	 * writing any data to avoid that a zone reset has to be issued while
@@ -706,6 +774,7 @@ void zbd_file_reset(struct thread_data *td, struct fio_file *f)
 	zbd_reset_zones(td, f, zb, ze, td->o.verify != VERIFY_NONE &&
 			(td->o.td_ddir & TD_DDIR_WRITE) &&
 			td->runstate != TD_VERIFYING);
+	zbd_reset_write_cnt(td, f);
 }
 
 /* The caller must hold f->zbd_info->mutex. */
@@ -852,7 +921,7 @@ struct fio_zone_info *zbd_convert_to_open_zone(struct thread_data *td,
 	/* Both z->mutex and f->zbd_info->mutex are held. */
 
 examine_zone:
-	if ((z->wp << 9) + min_bs <= ((z+1)->start << 9)) {
+	if (z->wp + min_bs <= (z+1)->start) {
 		pthread_mutex_unlock(&f->zbd_info->mutex);
 		goto out;
 	}
@@ -869,12 +938,12 @@ examine_zone:
 		zone_idx++;
 		pthread_mutex_unlock(&z->mutex);
 		z++;
-		if (!is_valid_offset(f, z->start << 9)) {
+		if (!is_valid_offset(f, z->start)) {
 			/* Wrap-around. */
 			zone_idx = zbd_zone_idx(f, f->file_offset);
 			z = &f->zbd_info->zone_info[zone_idx];
 		}
-		assert(is_valid_offset(f, z->start << 9));
+		assert(is_valid_offset(f, z->start));
 		pthread_mutex_lock(&z->mutex);
 		if (z->open)
 			continue;
@@ -894,7 +963,7 @@ examine_zone:
 		z = &f->zbd_info->zone_info[zone_idx];
 
 		pthread_mutex_lock(&z->mutex);
-		if ((z->wp << 9) + min_bs <= ((z+1)->start << 9))
+		if (z->wp + min_bs <= (z+1)->start)
 			goto out;
 		pthread_mutex_lock(&f->zbd_info->mutex);
 	}
@@ -907,7 +976,7 @@ examine_zone:
 out:
 	dprint(FD_ZBD, "%s(%s): returning zone %d\n", __func__, f->file_name,
 	       zone_idx);
-	io_u->offset = z->start << 9;
+	io_u->offset = z->start;
 	return z;
 }
 
@@ -928,7 +997,7 @@ static struct fio_zone_info *zbd_replay_write_order(struct thread_data *td,
 	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;
+	io_u->offset = z->start + z->verify_block++ * min_bs;
 	return z;
 }
 
@@ -957,7 +1026,7 @@ zbd_find_zone(struct thread_data *td, struct io_u *io_u,
 	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)
+			if (z1->start + min_bs <= z1->wp)
 				return z1;
 			pthread_mutex_unlock(&z1->mutex);
 		} else if (!td_random(td)) {
@@ -966,7 +1035,7 @@ zbd_find_zone(struct thread_data *td, struct io_u *io_u,
 		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)
+			if (z2->start + min_bs <= z2->wp)
 				return z2;
 			pthread_mutex_unlock(&z2->mutex);
 		}
@@ -997,7 +1066,7 @@ static void zbd_post_submit(const struct io_u *io_u, bool success)
 		return;
 
 	zone_idx = zbd_zone_idx(io_u->file, io_u->offset);
-	end = (io_u->offset + io_u->buflen) >> 9;
+	end = io_u->offset + io_u->buflen;
 	z = &zbd_info->zone_info[zone_idx];
 	assert(zone_idx < zbd_info->nr_zones);
 	if (z->type != BLK_ZONE_TYPE_SEQWRITE_REQ)
@@ -1007,6 +1076,14 @@ static void zbd_post_submit(const struct io_u *io_u, bool success)
 	switch (io_u->ddir) {
 	case DDIR_WRITE:
 		zone_end = min(end, (z + 1)->start);
+		pthread_mutex_lock(&zbd_info->mutex);
+		/*
+		 * z->wp > zone_end means that one or more I/O errors
+		 * have occurred.
+		 */
+		if (z->wp <= zone_end)
+			zbd_info->sectors_with_data += zone_end - z->wp;
+		pthread_mutex_unlock(&zbd_info->mutex);
 		z->wp = zone_end;
 		break;
 	case DDIR_TRIM:
@@ -1042,7 +1119,7 @@ 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;
+	struct fio_zone_info *zb, *zl, *orig_zb;
 	uint32_t orig_len = io_u->buflen;
 	uint32_t min_bs = td->o.min_bs[io_u->ddir];
 	uint64_t new_len;
@@ -1055,6 +1132,7 @@ enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u)
 	assert(io_u->buflen);
 	zone_idx_b = zbd_zone_idx(f, io_u->offset);
 	zb = &f->zbd_info->zone_info[zone_idx_b];
+	orig_zb = zb;
 
 	/* Accept the I/O offset for conventional zones. */
 	if (zb->type == BLK_ZONE_TYPE_CONVENTIONAL)
@@ -1076,21 +1154,14 @@ enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u)
 			goto accept;
 		}
 		/*
-		 * Avoid reads past the write pointer because such reads do not
-		 * hit the medium.
+		 * Check that there is enough written data in the zone to do an
+		 * I/O of at least min_bs B. If there isn't, find a new zone for
+		 * the I/O.
 		 */
 		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) {
+			zb->wp - zb->start : 0;
+		if (range < min_bs ||
+		    ((!td_random(td)) && (io_u->offset + min_bs > zb->wp))) {
 			pthread_mutex_unlock(&zb->mutex);
 			zl = &f->zbd_info->zone_info[zbd_zone_idx(f,
 						f->file_offset + f->io_size)];
@@ -1102,17 +1173,42 @@ enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u)
 				       io_u->buflen);
 				goto eof;
 			}
-			io_u->offset = zb->start << 9;
+			/*
+			 * zbd_find_zone() returned a zone with a range of at
+			 * least min_bs.
+			 */
+			range = zb->wp - zb->start;
+			assert(range >= min_bs);
+
+			if (!td_random(td))
+				io_u->offset = zb->start;
 		}
-		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;
+		/*
+		 * Make sure the I/O is within the zone valid data range while
+		 * maximizing the I/O size and preserving randomness.
+		 */
+		if (range <= io_u->buflen)
+			io_u->offset = zb->start;
+		else if (td_random(td))
+			io_u->offset = zb->start +
+				((io_u->offset - orig_zb->start) %
+				 (range - io_u->buflen)) / min_bs * min_bs;
+		/*
+		 * Make sure the I/O does not cross over the zone wp position.
+		 */
+		new_len = min((unsigned long long)io_u->buflen,
+			      (unsigned long long)(zb->wp - io_u->offset));
+		new_len = new_len / min_bs * min_bs;
+		if (new_len < io_u->buflen) {
+			io_u->buflen = new_len;
+			dprint(FD_IO, "Changed length from %u into %llu\n",
+			       orig_len, io_u->buflen);
 		}
+		assert(zb->start <= io_u->offset);
+		assert(io_u->offset + io_u->buflen <= zb->wp);
 		goto accept;
 	case DDIR_WRITE:
-		if (io_u->buflen > (f->zbd_info->zone_size << 9))
+		if (io_u->buflen > f->zbd_info->zone_size)
 			goto eof;
 		if (!zbd_open_zone(td, io_u, zone_idx_b)) {
 			pthread_mutex_unlock(&zb->mutex);
@@ -1121,6 +1217,15 @@ enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u)
 				goto eof;
 			zone_idx_b = zb - f->zbd_info->zone_info;
 		}
+		/* Check whether the zone reset threshold has been exceeded */
+		if (td->o.zrf.u.f) {
+			check_swd(td, f);
+			if (f->zbd_info->sectors_with_data >=
+			    f->io_size * td->o.zrt.u.f &&
+			    zbd_dec_and_reset_write_cnt(td, f)) {
+				zb->reset_zone = 1;
+			}
+		}
 		/* Reset the zone pointer if necessary */
 		if (zb->reset_zone || zbd_zone_full(f, zb, min_bs)) {
 			assert(td->o.verify == VERIFY_NONE);
@@ -1135,10 +1240,11 @@ enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u)
 			zb->reset_zone = 0;
 			if (zbd_reset_zone(td, f, zb) < 0)
 				goto eof;
+			check_swd(td, f);
 		}
 		/* Make writes occur at the write pointer */
 		assert(!zbd_zone_full(f, zb, min_bs));
-		io_u->offset = zb->wp << 9;
+		io_u->offset = zb->wp;
 		if (!is_valid_offset(f, io_u->offset)) {
 			dprint(FD_ZBD, "Dropped request with offset %llu\n",
 			       io_u->offset);
@@ -1150,7 +1256,7 @@ enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u)
 		 * small.
 		 */
 		new_len = min((unsigned long long)io_u->buflen,
-			      ((zb + 1)->start << 9) - io_u->offset);
+			      (zb + 1)->start - io_u->offset);
 		new_len = new_len / min_bs * min_bs;
 		if (new_len == io_u->buflen)
 			goto accept;
@@ -1161,7 +1267,7 @@ enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u)
 			goto accept;
 		}
 		log_err("Zone remainder %lld smaller than minimum block size %d\n",
-			(((zb + 1)->start << 9) - io_u->offset),
+			((zb + 1)->start - io_u->offset),
 			min_bs);
 		goto eof;
 	case DDIR_TRIM: