To prepare for write pointer consistency fix by fsck, add
f2fs_reset_zone() helper function which calls RESET ZONE command. The
function is added to lib/libf2fs_zoned which gathers zoned block device
related functions.

When f2fs-tools are built without blkzoned.h kernel header, the helper
function f2fs_reset_zone() prints an error message as other helper
functions in lib/libf2fs_zoned print. To make the message consistent
through the all helper functions, modify message strings in
f2fs_check_zones() and f2fs_reset_zones().

Signed-off-by: Shin'ichiro Kawasaki <[email protected]>
Reviewed-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
---
 include/f2fs_fs.h   |  1 +
 lib/libf2fs_zoned.c | 32 ++++++++++++++++++++++++++++++--
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index d6ea688..9c26314 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -1323,6 +1323,7 @@ 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);
+int f2fs_reset_zone(int, void *);
 extern int f2fs_reset_zones(int);
 
 #define SIZE_ALIGN(val, size)  ((val) + (size) - 1) / (size)
diff --git a/lib/libf2fs_zoned.c b/lib/libf2fs_zoned.c
index 5328c56..8b88fe9 100644
--- a/lib/libf2fs_zoned.c
+++ b/lib/libf2fs_zoned.c
@@ -388,6 +388,28 @@ out:
        return ret;
 }
 
+int f2fs_reset_zone(int i, void *blkzone)
+{
+       struct blk_zone *blkz = (struct blk_zone *)blkzone;
+       struct device_info *dev = c.devices + i;
+       struct blk_zone_range range;
+       int ret;
+
+       if (!blk_zone_seq(blkz) || blk_zone_empty(blkz))
+               return 0;
+
+       /* Non empty sequential zone: reset */
+       range.sector = blk_zone_sector(blkz);
+       range.nr_sectors = blk_zone_length(blkz);
+       ret = ioctl(dev->fd, BLKRESETZONE, &range);
+       if (ret != 0) {
+               ret = -errno;
+               ERR_MSG("ioctl BLKRESETZONE failed: errno=%d\n", errno);
+       }
+
+       return ret;
+}
+
 int f2fs_reset_zones(int j)
 {
        struct device_info *dev = c.devices + j;
@@ -487,13 +509,19 @@ int f2fs_get_zone_blocks(int i)
 
 int f2fs_check_zones(int i)
 {
-       ERR_MSG("%d: Zoned block devices are not supported\n", i);
+       ERR_MSG("%d: Unsupported zoned block device\n", i);
+       return -1;
+}
+
+int f2fs_reset_zone(int i, void *blkzone)
+{
+       ERR_MSG("%d: Unsupported zoned block device\n", i);
        return -1;
 }
 
 int f2fs_reset_zones(int i)
 {
-       ERR_MSG("%d: Zoned block devices are not supported\n", i);
+       ERR_MSG("%d: Unsupported zoned block device\n", i);
        return -1;
 }
 
-- 
2.23.0



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