btrfs: zoned: pass start block to btrfs_use_zone_append

btrfs_use_zone_append only needs the passed in extent_map's block_start
member, so there's no need to pass in the full extent map.

This also enables the use of btrfs_use_zone_append in places where we only
have a start byte but no extent_map.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: morbidrsa

fs/btrfs/extent_io.c

@@ -3762,7 +3762,7 @@ static noinline_for_stack int __extent_writepage_io(struct btrfs_inode *inode,
 		/* Note that em_end from extent_map_end() is exclusive */
 		iosize = min(em_end, end + 1) - cur;
 
-		if (btrfs_use_zone_append(inode, em))
+		if (btrfs_use_zone_append(inode, em->block_start))
 			opf = REQ_OP_ZONE_APPEND;
 
 		free_extent_map(em);

fs/btrfs/inode.c

@@ -7796,7 +7796,7 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
 	iomap->bdev = fs_info->fs_devices->latest_bdev;
 	iomap->length = len;
 
-	if (write && btrfs_use_zone_append(BTRFS_I(inode), em))
+	if (write && btrfs_use_zone_append(BTRFS_I(inode), em->block_start))
 		iomap->flags |= IOMAP_F_ZONE_APPEND;
 
 	free_extent_map(em);

fs/btrfs/zoned.c

@@ -1278,7 +1278,7 @@ void btrfs_free_redirty_list(struct btrfs_transaction *trans)
 	spin_unlock(&trans->releasing_ebs_lock);
 }
 
-bool btrfs_use_zone_append(struct btrfs_inode *inode, struct extent_map *em)
+bool btrfs_use_zone_append(struct btrfs_inode *inode, u64 start)
 {
 	struct btrfs_fs_info *fs_info = inode->root->fs_info;
 	struct btrfs_block_group *cache;
@@ -1293,7 +1293,7 @@ bool btrfs_use_zone_append(struct btrfs_inode *inode, struct extent_map *em)
 	if (!is_data_inode(&inode->vfs_inode))
 		return false;
 
-	cache = btrfs_lookup_block_group(fs_info, em->block_start);
+	cache = btrfs_lookup_block_group(fs_info, start);
 	ASSERT(cache);
 	if (!cache)
 		return false;

fs/btrfs/zoned.h

@@ -53,7 +53,7 @@ void btrfs_calc_zone_unusable(struct btrfs_block_group *cache);
 void btrfs_redirty_list_add(struct btrfs_transaction *trans,
 			    struct extent_buffer *eb);
 void btrfs_free_redirty_list(struct btrfs_transaction *trans);
-bool btrfs_use_zone_append(struct btrfs_inode *inode, struct extent_map *em);
+bool btrfs_use_zone_append(struct btrfs_inode *inode, u64 start);
 void btrfs_record_physical_zoned(struct inode *inode, u64 file_offset,
 				 struct bio *bio);
 void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered);
@@ -152,8 +152,7 @@ static inline void btrfs_redirty_list_add(struct btrfs_transaction *trans,
 					  struct extent_buffer *eb) { }
 static inline void btrfs_free_redirty_list(struct btrfs_transaction *trans) { }
 
-static inline bool btrfs_use_zone_append(struct btrfs_inode *inode,
-					 struct extent_map *em)
+static inline bool btrfs_use_zone_append(struct btrfs_inode *inode, u64 start)
 {
 	return false;
 }