[PATCH v2 2/2] btrfs: zoned: return error from btrfs_zone_finish_endio()

[Johannes Thumshirn <jth@kernel.org>]

From: Johannes Thumshirn <johannes.thumshirn@wdc.com>

Now that btrfs_zone_finish_endio_workfn() is directly calling
do_zone_finish() the only caller of btrfs_zone_finish_endio() is
btrfs_finish_one_ordered().

btrfs_finish_one_ordered() already has error handling in-place so
btrfs_zone_finish_endio() can return an error if the block group lookup
fails.

Also as btrfs_zone_finish_endio() already checks for zoned filesystems and
returns early, there's no need to do this in the caller. For developer
builds leave the ASSERT() in place to check for a block-group lookup
failure.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 fs/btrfs/inode.c | 7 ++++---
 fs/btrfs/zoned.c | 8 +++++---
 fs/btrfs/zoned.h | 9 ++++++---
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 6d9a8d8bea4c..793b1d520e8d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3109,9 +3109,10 @@ int btrfs_finish_one_ordered(struct btrfs_ordered_extent *ordered_extent)
 		goto out;
 	}
 
-	if (btrfs_is_zoned(fs_info))
-		btrfs_zone_finish_endio(fs_info, ordered_extent->disk_bytenr,
-					ordered_extent->disk_num_bytes);
+	ret = btrfs_zone_finish_endio(fs_info, ordered_extent->disk_bytenr,
+				      ordered_extent->disk_num_bytes);
+	if (ret)
+		goto out;
 
 	if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered_extent->flags)) {
 		truncated = true;
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 5a234f31c8da..0e61e49b8ce9 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -2431,16 +2431,17 @@ bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags)
 	return ret;
 }
 
-void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical, u64 length)
+int btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical, u64 length)
 {
 	struct btrfs_block_group *block_group;
 	u64 min_alloc_bytes;
 
 	if (!btrfs_is_zoned(fs_info))
-		return;
+		return 0;
 
 	block_group = btrfs_lookup_block_group(fs_info, logical);
-	ASSERT(block_group);
+	if (WARN_ON_ONCE(!block_group))
+		return -ENOENT;
 
 	/* No MIXED_BG on zoned btrfs. */
 	if (block_group->flags & BTRFS_BLOCK_GROUP_DATA)
@@ -2457,6 +2458,7 @@ void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical, u64 len
 
 out:
 	btrfs_put_block_group(block_group);
+	return 0;
 }
 
 static void btrfs_zone_finish_endio_workfn(struct work_struct *work)
diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h
index 6e11533b8e14..17c5656580dd 100644
--- a/fs/btrfs/zoned.h
+++ b/fs/btrfs/zoned.h
@@ -83,7 +83,7 @@ int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
 bool btrfs_zone_activate(struct btrfs_block_group *block_group);
 int btrfs_zone_finish(struct btrfs_block_group *block_group);
 bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags);
-void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical,
+int btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical,
 			     u64 length);
 void btrfs_schedule_zone_finish_bg(struct btrfs_block_group *bg,
 				   struct extent_buffer *eb);
@@ -234,8 +234,11 @@ static inline bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices,
 	return true;
 }
 
-static inline void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info,
-					   u64 logical, u64 length) { }
+static inline int btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info,
+					   u64 logical, u64 length)
+{
+	return 0;
+}
 
 static inline void btrfs_schedule_zone_finish_bg(struct btrfs_block_group *bg,
 						 struct extent_buffer *eb) { }
-- 
2.50.1