[f2fs-dev] [PATCH v6 2/8] libf2fs_zoned: Introduce f2fs_report_zone() helper function

[Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>]

To prepare for write pointer consistency check by fsck, add
f2fs_report_zone() helper function which calls REPORT ZONE command to
get write pointer status of a single zone. The function is added to
lib/libf2fs_zoned which gathers zoned block device related functions.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
---
 include/f2fs_fs.h   |  1 +
 lib/libf2fs_zoned.c | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index a437379..1f7ef05 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -1299,6 +1299,7 @@ blk_zone_cond_str(struct blk_zone *blkz)
 
 extern int f2fs_get_zoned_model(int);
 extern int f2fs_get_zone_blocks(int);
+extern int f2fs_report_zone(int, u_int64_t, void *);
 typedef int (report_zones_cb_t)(int i, void *, void *);
 extern int f2fs_report_zones(int, report_zones_cb_t *, void *);
 extern int f2fs_check_zones(int);
diff --git a/lib/libf2fs_zoned.c b/lib/libf2fs_zoned.c
index 8ad4171..5328c56 100644
--- a/lib/libf2fs_zoned.c
+++ b/lib/libf2fs_zoned.c
@@ -191,6 +191,33 @@ int f2fs_get_zone_blocks(int i)
 	return 0;
 }
 
+int f2fs_report_zone(int i, u_int64_t sector, void *blkzone)
+{
+	struct blk_zone *blkz = (struct blk_zone *)blkzone;
+	struct blk_zone_report *rep;
+	int ret = -1;
+
+	rep = malloc(sizeof(struct blk_zone_report) + sizeof(struct blk_zone));
+	if (!rep) {
+		ERR_MSG("No memory for report zones\n");
+		return -ENOMEM;
+	}
+
+	rep->sector = sector;
+	rep->nr_zones = 1;
+	ret = ioctl(c.devices[i].fd, BLKREPORTZONE, rep);
+	if (ret != 0) {
+		ret = -errno;
+		ERR_MSG("ioctl BLKREPORTZONE failed: errno=%d\n", errno);
+		goto out;
+	}
+
+	*blkz = *(struct blk_zone *)(rep + 1);
+out:
+	free(rep);
+	return ret;
+}
+
 #define F2FS_REPORT_ZONES_BUFSZ	524288
 
 int f2fs_report_zones(int j, report_zones_cb_t *report_zones_cb, void *opaque)
@@ -425,6 +452,12 @@ out:
 
 #else
 
+int f2fs_report_zone(int i, u_int64_t sector, void *blkzone)
+{
+	ERR_MSG("%d: Unsupported zoned block device\n", i);
+	return -1;
+}
+
 int f2fs_report_zones(int i, report_zones_cb_t *report_zones_cb, void *opaque)
 {
 	ERR_MSG("%d: Unsupported zoned block device\n", i);
-- 
2.21.0



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