f2fs: check zone type before sending async reset zone command

The commit 25f9080576b9 ("f2fs: add async reset zone command support")
introduced "async reset zone commands" by calling
__submit_zone_reset_cmd() in async discard operations. However,
__submit_zone_reset_cmd() is called regardless of zone type of discard
target zone. When devices have conventional zones, zone reset commands
are sent to the conventional zones and cause I/O errors.

Avoid the I/O errors by checking that the discard target zone type is
sequential write required. If not, handle the discard operation in same
manner as non-zoned, regular block devices. For that purpose, add a new
helper function f2fs_bdev_index() which gets index of the zone reset
target device.

Fixes: 25f9080576b9 ("f2fs: add async reset zone command support")
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index d372bedb0fe4..a52830927cb4 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -4423,6 +4423,22 @@ static inline bool f2fs_blkz_is_seq(struct f2fs_sb_info *sbi, int devi,
 }
 #endif
 
+static inline int f2fs_bdev_index(struct f2fs_sb_info *sbi,
+				  struct block_device *bdev)
+{
+	int i;
+
+	if (!f2fs_is_multi_device(sbi))
+		return 0;
+
+	for (i = 0; i < sbi->s_ndevs; i++)
+		if (FDEV(i).bdev == bdev)
+			return i;
+
+	WARN_ON(1);
+	return -1;
+}
+
 static inline bool f2fs_hw_should_discard(struct f2fs_sb_info *sbi)
 {
 	return f2fs_sb_has_blkzoned(sbi);