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Subject[PATCH 04/12] btrfs-progs: Introduce zone block device helper functions
Date
This patch introduce several zone related functions: btrfs_get_zones() to
get zone information from the specified device and put the information in
zinfo, and zone_is_random_write() to check if a zone accept random writes.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
---
utils.c | 194 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
utils.h | 16 +++++
volumes.h | 28 ++++++++
3 files changed, 238 insertions(+)

diff --git a/utils.c b/utils.c
index 7d5a1f3b7f8d..d50304b1be80 100644
--- a/utils.c
+++ b/utils.c
@@ -359,6 +359,200 @@ out:
return ret;
}

+enum btrfs_zoned_model zoned_model(const char *file)
+{
+ char model[32];
+ int ret;
+
+ ret = queue_param(file, "zoned", model, sizeof(model));
+ if (ret <= 0)
+ return ZONED_NONE;
+
+ if (strncmp(model, "host-aware", 10) == 0)
+ return ZONED_HOST_AWARE;
+ if (strncmp(model, "host-managed", 12) == 0)
+ return ZONED_HOST_MANAGED;
+
+ return ZONED_NONE;
+}
+
+size_t zone_size(const char *file)
+{
+ char chunk[32];
+ int ret;
+
+ ret = queue_param(file, "chunk_sectors", chunk, sizeof(chunk));
+ if (ret <= 0)
+ return 0;
+
+ return strtoul((const char *)chunk, NULL, 10) << 9;
+}
+
+#ifdef BTRFS_ZONED
+int zone_is_random_write(struct btrfs_zone_info *zinfo, u64 bytenr)
+{
+ unsigned int zno;
+
+ if (zinfo->model == ZONED_NONE)
+ return 1;
+
+ zno = bytenr / zinfo->zone_size;
+
+ /*
+ * Only sequential write required zones on host-managed
+ * devices cannot be written randomly.
+ */
+ return zinfo->zones[zno].type != BLK_ZONE_TYPE_SEQWRITE_REQ;
+}
+
+#define BTRFS_REPORT_NR_ZONES 8192
+
+static int btrfs_get_zones(int fd, const char *file, u64 block_count,
+ struct btrfs_zone_info *zinfo)
+{
+ size_t zone_bytes = zone_size(file);
+ size_t rep_size;
+ u64 sector = 0;
+ struct blk_zone_report *rep;
+ struct blk_zone *zone;
+ unsigned int i, n = 0;
+ int ret;
+
+ /*
+ * Zones are guaranteed (by the kernel) to be a power of 2 number of
+ * sectors. Check this here and make sure that zones are not too
+ * small.
+ */
+ if (!zone_bytes || (zone_bytes & (zone_bytes - 1))) {
+ error("ERROR: Illegal zone size %zu (not a power of 2)\n",
+ zone_bytes);
+ exit(1);
+ }
+ if (zone_bytes < BTRFS_MKFS_SYSTEM_GROUP_SIZE) {
+ error("ERROR: Illegal zone size %zu (smaller than %d)\n",
+ zone_bytes,
+ BTRFS_MKFS_SYSTEM_GROUP_SIZE);
+ exit(1);
+ }
+
+ /* Allocate the zone information array */
+ zinfo->zone_size = zone_bytes;
+ zinfo->nr_zones = block_count / zone_bytes;
+ if (block_count & (zone_bytes - 1))
+ zinfo->nr_zones++;
+ zinfo->zones = calloc(zinfo->nr_zones, sizeof(struct blk_zone));
+ if (!zinfo->zones) {
+ error("No memory for zone information\n");
+ exit(1);
+ }
+
+ /* Allocate a zone report */
+ rep_size = sizeof(struct blk_zone_report) +
+ sizeof(struct blk_zone) * BTRFS_REPORT_NR_ZONES;
+ rep = malloc(rep_size);
+ if (!rep) {
+ error("No memory for zones report\n");
+ exit(1);
+ }
+
+ /* Get zone information */
+ zone = (struct blk_zone *)(rep + 1);
+ while (n < zinfo->nr_zones) {
+
+ memset(rep, 0, rep_size);
+ rep->sector = sector;
+ rep->nr_zones = BTRFS_REPORT_NR_ZONES;
+
+ ret = ioctl(fd, BLKREPORTZONE, rep);
+ if (ret != 0) {
+ error("ioctl BLKREPORTZONE failed (%s)\n",
+ strerror(errno));
+ exit(1);
+ }
+
+ if (!rep->nr_zones)
+ break;
+
+ for (i = 0; i < rep->nr_zones; i++) {
+ if (n >= zinfo->nr_zones)
+ break;
+ memcpy(&zinfo->zones[n], &zone[i],
+ sizeof(struct blk_zone));
+ sector = zone[i].start + zone[i].len;
+ n++;
+ }
+
+ }
+
+ /*
+ * We need at least one random write zone (a conventional zone or
+ * a sequential write preferred zone on a host-aware device).
+ */
+ if (!zone_is_random_write(zinfo, 0)) {
+ error("ERROR: No conventional zone at block 0\n");
+ exit(1);
+ }
+
+ zinfo->nr_zones = n;
+
+ free(rep);
+
+ return 0;
+}
+
+#endif
+
+int btrfs_get_zone_info(int fd, const char *file, int hmzoned,
+ struct btrfs_zone_info *zinfo)
+{
+ struct stat st;
+ int ret;
+
+ memset(zinfo, 0, sizeof(struct btrfs_zone_info));
+
+ ret = fstat(fd, &st);
+ if (ret < 0) {
+ error("unable to stat %s\n", file);
+ return 1;
+ }
+
+ if (!S_ISBLK(st.st_mode))
+ return 0;
+
+ /* Check zone model */
+ zinfo->model = zoned_model(file);
+ if (zinfo->model == ZONED_NONE)
+ return 0;
+
+ if (zinfo->model == ZONED_HOST_MANAGED && !hmzoned) {
+ error("%s: host-managed zoned block device (enable zone block device support with -O hmzoned)\n",
+ file);
+ return -1;
+ }
+
+ if (!hmzoned) {
+ /* Treat host-aware devices as regular devices */
+ zinfo->model = ZONED_NONE;
+ return 0;
+ }
+
+#ifdef BTRFS_ZONED
+ /* Get zone information */
+ ret = btrfs_get_zones(fd, file, btrfs_device_size(fd, &st), zinfo);
+ if (ret != 0)
+ return ret;
+#else
+ error("%s: Unsupported host-%s zoned block device\n",
+ file, zinfo->model == ZONED_HOST_MANAGED ? "managed" : "aware");
+ if (zinfo->model == ZONED_HOST_MANAGED)
+ return -1;
+
+ printf("%s: heandling host-aware block device as a regular disk\n",
+ file);
+#endif
+ return 0;
+}
+
int btrfs_prepare_device(int fd, const char *file, u64 *block_count_ret,
u64 max_block_count, unsigned opflags)
{
diff --git a/utils.h b/utils.h
index 47321f62c8e0..f5e5c5bec66a 100644
--- a/utils.h
+++ b/utils.h
@@ -69,6 +69,7 @@ void units_set_base(unsigned *units, unsigned base);
#define PREP_DEVICE_ZERO_END (1U << 0)
#define PREP_DEVICE_DISCARD (1U << 1)
#define PREP_DEVICE_VERBOSE (1U << 2)
+#define PREP_DEVICE_HMZONED (1U << 3)

#define SEEN_FSID_HASH_SIZE 256
struct seen_fsid {
@@ -78,10 +79,25 @@ struct seen_fsid {
int fd;
};

+struct btrfs_zone_info;
+
+enum btrfs_zoned_model zoned_model(const char *file);
+size_t zone_size(const char *file);
int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 objectid);
int btrfs_prepare_device(int fd, const char *file, u64 *block_count_ret,
u64 max_block_count, unsigned opflags);
+int btrfs_get_zone_info(int fd, const char *file, int hmzoned,
+ struct btrfs_zone_info *zinfo);
+#ifdef BTRFS_ZONED
+int zone_is_random_write(struct btrfs_zone_info *zinfo, u64 bytenr);
+#else
+static inline int zone_is_random_write(struct btrfs_zone_info *zinfo,
+ u64 bytenr)
+{
+ return 1;
+}
+#endif
int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
struct btrfs_root *root, int fd, const char *path,
u64 block_count, u32 io_width, u32 io_align,
diff --git a/volumes.h b/volumes.h
index dbe9d3dea647..c9262ceaea93 100644
--- a/volumes.h
+++ b/volumes.h
@@ -22,12 +22,40 @@
#include "kerncompat.h"
#include "ctree.h"

+#ifdef BTRFS_ZONED
+#include <linux/blkzoned.h>
+#else
+struct blk_zone {
+ int dummy;
+};
+#endif
+
+/*
+ * Zoned block device models.
+ */
+enum btrfs_zoned_model {
+ ZONED_NONE = 0,
+ ZONED_HOST_AWARE,
+ ZONED_HOST_MANAGED,
+};
+
+/*
+ * Zone information for a zoned block device.
+ */
+struct btrfs_zone_info {
+ enum btrfs_zoned_model model;
+ size_t zone_size;
+ struct blk_zone *zones;
+ unsigned int nr_zones;
+};
+
#define BTRFS_STRIPE_LEN SZ_64K

struct btrfs_device {
struct list_head dev_list;
struct btrfs_root *dev_root;
struct btrfs_fs_devices *fs_devices;
+ struct btrfs_zone_info zinfo;

u64 total_ios;

--
2.21.0
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