diff mbox series

[v2,09/21] btrfs: factor out create_chunk()

Message ID 20200212072048.629856-10-naohiro.aota@wdc.com (mailing list archive)
State New, archived
Headers show
Series btrfs: refactor and generalize chunk/dev_extent/extent allocation | expand

Commit Message

Naohiro Aota Feb. 12, 2020, 7:20 a.m. UTC 
Factor out create_chunk() from __btrfs_alloc_chunk(). This function finally
creates a chunk. There is no functional changes.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
---
 fs/btrfs/volumes.c | 130 ++++++++++++++++++++++++---------------------
 1 file changed, 70 insertions(+), 60 deletions(-)

Comments

Johannes Thumshirn Feb. 12, 2020, 8:07 a.m. UTC | #1 
Looks good,
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Josef Bacik Feb. 13, 2020, 4:24 p.m. UTC | #2 
On 2/12/20 2:20 AM, Naohiro Aota wrote:
> Factor out create_chunk() from __btrfs_alloc_chunk(). This function finally
> creates a chunk. There is no functional changes.
> 
> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
> ---
>   fs/btrfs/volumes.c | 130 ++++++++++++++++++++++++---------------------
>   1 file changed, 70 insertions(+), 60 deletions(-)
> 
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 00085943e4dd..3e2e3896d72a 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -5052,90 +5052,53 @@ static int decide_stripe_size(struct btrfs_fs_devices *fs_devices,
>   	}
>   }
>   
> -static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
> -			       u64 start, u64 type)
> +static int create_chunk(struct btrfs_trans_handle *trans,
> +			struct alloc_chunk_ctl *ctl,
> +			struct btrfs_device_info *devices_info)
>   {
>   	struct btrfs_fs_info *info = trans->fs_info;
> -	struct btrfs_fs_devices *fs_devices = info->fs_devices;
>   	struct map_lookup *map = NULL;
>   	struct extent_map_tree *em_tree;
>   	struct extent_map *em;
> -	struct btrfs_device_info *devices_info = NULL;
> -	struct alloc_chunk_ctl ctl;
> +	u64 start = ctl->start;
> +	u64 type = ctl->type;
>   	int ret;
>   	int i;
>   	int j;
>   
> -	if (!alloc_profile_is_valid(type, 0)) {
> -		ASSERT(0);
> -		return -EINVAL;
> -	}
> -
> -	if (list_empty(&fs_devices->alloc_list)) {
> -		if (btrfs_test_opt(info, ENOSPC_DEBUG))
> -			btrfs_debug(info, "%s: no writable device", __func__);
> -		return -ENOSPC;
> -	}
> -
> -	if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
> -		btrfs_err(info, "invalid chunk type 0x%llx requested", type);
> -		BUG();
> -	}
> -
> -	ctl.start = start;
> -	ctl.type = type;
> -	init_alloc_chunk_ctl(fs_devices, &ctl);
> -
> -	devices_info = kcalloc(fs_devices->rw_devices, sizeof(*devices_info),
> -			       GFP_NOFS);
> -	if (!devices_info)
> +	map = kmalloc(map_lookup_size(ctl->num_stripes), GFP_NOFS);
> +	if (!map)
>   		return -ENOMEM;
> +	map->num_stripes = ctl->num_stripes;
>   
> -	ret = gather_device_info(fs_devices, &ctl, devices_info);
> -	if (ret < 0)
> -		goto error;
> -
> -	ret = decide_stripe_size(fs_devices, &ctl, devices_info);
> -	if (ret < 0)
> -		goto error;
> -
> -	map = kmalloc(map_lookup_size(ctl.num_stripes), GFP_NOFS);
> -	if (!map) {
> -		ret = -ENOMEM;
> -		goto error;
> -	}
> -
> -	map->num_stripes = ctl.num_stripes;
> -
> -	for (i = 0; i < ctl.ndevs; ++i) {
> -		for (j = 0; j < ctl.dev_stripes; ++j) {
> -			int s = i * ctl.dev_stripes + j;
> +	for (i = 0; i < ctl->ndevs; ++i) {
> +		for (j = 0; j < ctl->dev_stripes; ++j) {
> +			int s = i * ctl->dev_stripes + j;
>   			map->stripes[s].dev = devices_info[i].dev;
>   			map->stripes[s].physical = devices_info[i].dev_offset +
> -						   j * ctl.stripe_size;
> +						   j * ctl->stripe_size;
>   		}
>   	}
>   	map->stripe_len = BTRFS_STRIPE_LEN;
>   	map->io_align = BTRFS_STRIPE_LEN;
>   	map->io_width = BTRFS_STRIPE_LEN;
>   	map->type = type;
> -	map->sub_stripes = ctl.sub_stripes;
> +	map->sub_stripes = ctl->sub_stripes;
>   
> -	trace_btrfs_chunk_alloc(info, map, start, ctl.chunk_size);
> +	trace_btrfs_chunk_alloc(info, map, start, ctl->chunk_size);
>   
>   	em = alloc_extent_map();
>   	if (!em) {
>   		kfree(map);
> -		ret = -ENOMEM;
> -		goto error;
> +		return -ENOMEM;
>   	}
>   	set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags);
>   	em->map_lookup = map;
>   	em->start = start;
> -	em->len = ctl.chunk_size;
> +	em->len = ctl->chunk_size;
>   	em->block_start = 0;
>   	em->block_len = em->len;
> -	em->orig_block_len = ctl.stripe_size;
> +	em->orig_block_len = ctl->stripe_size;
>   
>   	em_tree = &info->mapping_tree;
>   	write_lock(&em_tree->lock);
> @@ -5143,11 +5106,11 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
>   	if (ret) {
>   		write_unlock(&em_tree->lock);
>   		free_extent_map(em);
> -		goto error;
> +		return ret;
>   	}
>   	write_unlock(&em_tree->lock);
>   
> -	ret = btrfs_make_block_group(trans, 0, type, start, ctl.chunk_size);
> +	ret = btrfs_make_block_group(trans, 0, type, start, ctl->chunk_size);
>   	if (ret)
>   		goto error_del_extent;
>   
> @@ -5155,20 +5118,19 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
>   		struct btrfs_device *dev = map->stripes[i].dev;
>   
>   		btrfs_device_set_bytes_used(dev,
> -					    dev->bytes_used + ctl.stripe_size);
> +					    dev->bytes_used + ctl->stripe_size);
>   		if (list_empty(&dev->post_commit_list))
>   			list_add_tail(&dev->post_commit_list,
>   				      &trans->transaction->dev_update_list);
>   	}
>   
> -	atomic64_sub(ctl.stripe_size * map->num_stripes,
> +	atomic64_sub(ctl->stripe_size * map->num_stripes,
>   		     &info->free_chunk_space);
>   
>   	free_extent_map(em);
>   	check_raid56_incompat_flag(info, type);
>   	check_raid1c34_incompat_flag(info, type);
>   
> -	kfree(devices_info);
>   	return 0;
>   
>   error_del_extent:
> @@ -5180,7 +5142,55 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
>   	free_extent_map(em);
>   	/* One for the tree reference */
>   	free_extent_map(em);
> -error:
> +
> +	return ret;
> +}
> +
> +static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
> +			       u64 start, u64 type)
> +{
> +	struct btrfs_fs_info *info = trans->fs_info;
> +	struct btrfs_fs_devices *fs_devices = info->fs_devices;
> +	struct btrfs_device_info *devices_info = NULL;
> +	struct alloc_chunk_ctl ctl;
> +	int ret;
> +
> +	if (!alloc_profile_is_valid(type, 0)) {
> +		ASSERT(0);
> +		return -EINVAL;
> +	}
> +
> +	if (list_empty(&fs_devices->alloc_list)) {
> +		if (btrfs_test_opt(info, ENOSPC_DEBUG))
> +			btrfs_debug(info, "%s: no writable device", __func__);
> +		return -ENOSPC;
> +	}
> +
> +	if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
> +		btrfs_err(info, "invalid chunk type 0x%llx requested", type);
> +		BUG();
> +	}

This is superfluous, alloc_profile_is_valid() handles this check.  Thanks,

Josef
Naohiro Aota Feb. 20, 2020, 10:17 a.m. UTC | #3 
On Thu, Feb 13, 2020 at 11:24:57AM -0500, Josef Bacik wrote:
>On 2/12/20 2:20 AM, Naohiro Aota wrote:
>>Factor out create_chunk() from __btrfs_alloc_chunk(). This function finally
>>creates a chunk. There is no functional changes.
>>
>>Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
>>---
>>  fs/btrfs/volumes.c | 130 ++++++++++++++++++++++++---------------------
>>  1 file changed, 70 insertions(+), 60 deletions(-)
>>
>>diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
>>index 00085943e4dd..3e2e3896d72a 100644
>>--- a/fs/btrfs/volumes.c
>>+++ b/fs/btrfs/volumes.c
>>@@ -5052,90 +5052,53 @@ static int decide_stripe_size(struct btrfs_fs_devices *fs_devices,
>>  	}
>>  }
>>-static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
>>-			       u64 start, u64 type)
>>+static int create_chunk(struct btrfs_trans_handle *trans,
>>+			struct alloc_chunk_ctl *ctl,
>>+			struct btrfs_device_info *devices_info)
>>  {
>>  	struct btrfs_fs_info *info = trans->fs_info;
>>-	struct btrfs_fs_devices *fs_devices = info->fs_devices;
>>  	struct map_lookup *map = NULL;
>>  	struct extent_map_tree *em_tree;
>>  	struct extent_map *em;
>>-	struct btrfs_device_info *devices_info = NULL;
>>-	struct alloc_chunk_ctl ctl;
>>+	u64 start = ctl->start;
>>+	u64 type = ctl->type;
>>  	int ret;
>>  	int i;
>>  	int j;
>>-	if (!alloc_profile_is_valid(type, 0)) {
>>-		ASSERT(0);
>>-		return -EINVAL;
>>-	}
>>-
>>-	if (list_empty(&fs_devices->alloc_list)) {
>>-		if (btrfs_test_opt(info, ENOSPC_DEBUG))
>>-			btrfs_debug(info, "%s: no writable device", __func__);
>>-		return -ENOSPC;
>>-	}
>>-
>>-	if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
>>-		btrfs_err(info, "invalid chunk type 0x%llx requested", type);
>>-		BUG();
>>-	}
>>-
>>-	ctl.start = start;
>>-	ctl.type = type;
>>-	init_alloc_chunk_ctl(fs_devices, &ctl);
>>-
>>-	devices_info = kcalloc(fs_devices->rw_devices, sizeof(*devices_info),
>>-			       GFP_NOFS);
>>-	if (!devices_info)
>>+	map = kmalloc(map_lookup_size(ctl->num_stripes), GFP_NOFS);
>>+	if (!map)
>>  		return -ENOMEM;
>>+	map->num_stripes = ctl->num_stripes;
>>-	ret = gather_device_info(fs_devices, &ctl, devices_info);
>>-	if (ret < 0)
>>-		goto error;
>>-
>>-	ret = decide_stripe_size(fs_devices, &ctl, devices_info);
>>-	if (ret < 0)
>>-		goto error;
>>-
>>-	map = kmalloc(map_lookup_size(ctl.num_stripes), GFP_NOFS);
>>-	if (!map) {
>>-		ret = -ENOMEM;
>>-		goto error;
>>-	}
>>-
>>-	map->num_stripes = ctl.num_stripes;
>>-
>>-	for (i = 0; i < ctl.ndevs; ++i) {
>>-		for (j = 0; j < ctl.dev_stripes; ++j) {
>>-			int s = i * ctl.dev_stripes + j;
>>+	for (i = 0; i < ctl->ndevs; ++i) {
>>+		for (j = 0; j < ctl->dev_stripes; ++j) {
>>+			int s = i * ctl->dev_stripes + j;
>>  			map->stripes[s].dev = devices_info[i].dev;
>>  			map->stripes[s].physical = devices_info[i].dev_offset +
>>-						   j * ctl.stripe_size;
>>+						   j * ctl->stripe_size;
>>  		}
>>  	}
>>  	map->stripe_len = BTRFS_STRIPE_LEN;
>>  	map->io_align = BTRFS_STRIPE_LEN;
>>  	map->io_width = BTRFS_STRIPE_LEN;
>>  	map->type = type;
>>-	map->sub_stripes = ctl.sub_stripes;
>>+	map->sub_stripes = ctl->sub_stripes;
>>-	trace_btrfs_chunk_alloc(info, map, start, ctl.chunk_size);
>>+	trace_btrfs_chunk_alloc(info, map, start, ctl->chunk_size);
>>  	em = alloc_extent_map();
>>  	if (!em) {
>>  		kfree(map);
>>-		ret = -ENOMEM;
>>-		goto error;
>>+		return -ENOMEM;
>>  	}
>>  	set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags);
>>  	em->map_lookup = map;
>>  	em->start = start;
>>-	em->len = ctl.chunk_size;
>>+	em->len = ctl->chunk_size;
>>  	em->block_start = 0;
>>  	em->block_len = em->len;
>>-	em->orig_block_len = ctl.stripe_size;
>>+	em->orig_block_len = ctl->stripe_size;
>>  	em_tree = &info->mapping_tree;
>>  	write_lock(&em_tree->lock);
>>@@ -5143,11 +5106,11 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
>>  	if (ret) {
>>  		write_unlock(&em_tree->lock);
>>  		free_extent_map(em);
>>-		goto error;
>>+		return ret;
>>  	}
>>  	write_unlock(&em_tree->lock);
>>-	ret = btrfs_make_block_group(trans, 0, type, start, ctl.chunk_size);
>>+	ret = btrfs_make_block_group(trans, 0, type, start, ctl->chunk_size);
>>  	if (ret)
>>  		goto error_del_extent;
>>@@ -5155,20 +5118,19 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
>>  		struct btrfs_device *dev = map->stripes[i].dev;
>>  		btrfs_device_set_bytes_used(dev,
>>-					    dev->bytes_used + ctl.stripe_size);
>>+					    dev->bytes_used + ctl->stripe_size);
>>  		if (list_empty(&dev->post_commit_list))
>>  			list_add_tail(&dev->post_commit_list,
>>  				      &trans->transaction->dev_update_list);
>>  	}
>>-	atomic64_sub(ctl.stripe_size * map->num_stripes,
>>+	atomic64_sub(ctl->stripe_size * map->num_stripes,
>>  		     &info->free_chunk_space);
>>  	free_extent_map(em);
>>  	check_raid56_incompat_flag(info, type);
>>  	check_raid1c34_incompat_flag(info, type);
>>-	kfree(devices_info);
>>  	return 0;
>>  error_del_extent:
>>@@ -5180,7 +5142,55 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
>>  	free_extent_map(em);
>>  	/* One for the tree reference */
>>  	free_extent_map(em);
>>-error:
>>+
>>+	return ret;
>>+}
>>+
>>+static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
>>+			       u64 start, u64 type)
>>+{
>>+	struct btrfs_fs_info *info = trans->fs_info;
>>+	struct btrfs_fs_devices *fs_devices = info->fs_devices;
>>+	struct btrfs_device_info *devices_info = NULL;
>>+	struct alloc_chunk_ctl ctl;
>>+	int ret;
>>+
>>+	if (!alloc_profile_is_valid(type, 0)) {
>>+		ASSERT(0);
>>+		return -EINVAL;
>>+	}
>>+
>>+	if (list_empty(&fs_devices->alloc_list)) {
>>+		if (btrfs_test_opt(info, ENOSPC_DEBUG))
>>+			btrfs_debug(info, "%s: no writable device", __func__);
>>+		return -ENOSPC;
>>+	}
>>+
>>+	if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
>>+		btrfs_err(info, "invalid chunk type 0x%llx requested", type);
>>+		BUG();
>>+	}
>
>This is superfluous, alloc_profile_is_valid() handles this check.  Thanks,
>
>Josef

This checks if at least one block group type (data, metadata or
system) flag is set. OTOH, alloc_profile_is_valid() checks if profile
bits are valid.

Maybe, we can move this check into alloc_profile_is_valid()?

Thanks,
diff mbox series

Patch

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 00085943e4dd..3e2e3896d72a 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5052,90 +5052,53 @@  static int decide_stripe_size(struct btrfs_fs_devices *fs_devices,
 	}
 }
 
-static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
-			       u64 start, u64 type)
+static int create_chunk(struct btrfs_trans_handle *trans,
+			struct alloc_chunk_ctl *ctl,
+			struct btrfs_device_info *devices_info)
 {
 	struct btrfs_fs_info *info = trans->fs_info;
-	struct btrfs_fs_devices *fs_devices = info->fs_devices;
 	struct map_lookup *map = NULL;
 	struct extent_map_tree *em_tree;
 	struct extent_map *em;
-	struct btrfs_device_info *devices_info = NULL;
-	struct alloc_chunk_ctl ctl;
+	u64 start = ctl->start;
+	u64 type = ctl->type;
 	int ret;
 	int i;
 	int j;
 
-	if (!alloc_profile_is_valid(type, 0)) {
-		ASSERT(0);
-		return -EINVAL;
-	}
-
-	if (list_empty(&fs_devices->alloc_list)) {
-		if (btrfs_test_opt(info, ENOSPC_DEBUG))
-			btrfs_debug(info, "%s: no writable device", __func__);
-		return -ENOSPC;
-	}
-
-	if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
-		btrfs_err(info, "invalid chunk type 0x%llx requested", type);
-		BUG();
-	}
-
-	ctl.start = start;
-	ctl.type = type;
-	init_alloc_chunk_ctl(fs_devices, &ctl);
-
-	devices_info = kcalloc(fs_devices->rw_devices, sizeof(*devices_info),
-			       GFP_NOFS);
-	if (!devices_info)
+	map = kmalloc(map_lookup_size(ctl->num_stripes), GFP_NOFS);
+	if (!map)
 		return -ENOMEM;
+	map->num_stripes = ctl->num_stripes;
 
-	ret = gather_device_info(fs_devices, &ctl, devices_info);
-	if (ret < 0)
-		goto error;
-
-	ret = decide_stripe_size(fs_devices, &ctl, devices_info);
-	if (ret < 0)
-		goto error;
-
-	map = kmalloc(map_lookup_size(ctl.num_stripes), GFP_NOFS);
-	if (!map) {
-		ret = -ENOMEM;
-		goto error;
-	}
-
-	map->num_stripes = ctl.num_stripes;
-
-	for (i = 0; i < ctl.ndevs; ++i) {
-		for (j = 0; j < ctl.dev_stripes; ++j) {
-			int s = i * ctl.dev_stripes + j;
+	for (i = 0; i < ctl->ndevs; ++i) {
+		for (j = 0; j < ctl->dev_stripes; ++j) {
+			int s = i * ctl->dev_stripes + j;
 			map->stripes[s].dev = devices_info[i].dev;
 			map->stripes[s].physical = devices_info[i].dev_offset +
-						   j * ctl.stripe_size;
+						   j * ctl->stripe_size;
 		}
 	}
 	map->stripe_len = BTRFS_STRIPE_LEN;
 	map->io_align = BTRFS_STRIPE_LEN;
 	map->io_width = BTRFS_STRIPE_LEN;
 	map->type = type;
-	map->sub_stripes = ctl.sub_stripes;
+	map->sub_stripes = ctl->sub_stripes;
 
-	trace_btrfs_chunk_alloc(info, map, start, ctl.chunk_size);
+	trace_btrfs_chunk_alloc(info, map, start, ctl->chunk_size);
 
 	em = alloc_extent_map();
 	if (!em) {
 		kfree(map);
-		ret = -ENOMEM;
-		goto error;
+		return -ENOMEM;
 	}
 	set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags);
 	em->map_lookup = map;
 	em->start = start;
-	em->len = ctl.chunk_size;
+	em->len = ctl->chunk_size;
 	em->block_start = 0;
 	em->block_len = em->len;
-	em->orig_block_len = ctl.stripe_size;
+	em->orig_block_len = ctl->stripe_size;
 
 	em_tree = &info->mapping_tree;
 	write_lock(&em_tree->lock);
@@ -5143,11 +5106,11 @@  static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 	if (ret) {
 		write_unlock(&em_tree->lock);
 		free_extent_map(em);
-		goto error;
+		return ret;
 	}
 	write_unlock(&em_tree->lock);
 
-	ret = btrfs_make_block_group(trans, 0, type, start, ctl.chunk_size);
+	ret = btrfs_make_block_group(trans, 0, type, start, ctl->chunk_size);
 	if (ret)
 		goto error_del_extent;
 
@@ -5155,20 +5118,19 @@  static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 		struct btrfs_device *dev = map->stripes[i].dev;
 
 		btrfs_device_set_bytes_used(dev,
-					    dev->bytes_used + ctl.stripe_size);
+					    dev->bytes_used + ctl->stripe_size);
 		if (list_empty(&dev->post_commit_list))
 			list_add_tail(&dev->post_commit_list,
 				      &trans->transaction->dev_update_list);
 	}
 
-	atomic64_sub(ctl.stripe_size * map->num_stripes,
+	atomic64_sub(ctl->stripe_size * map->num_stripes,
 		     &info->free_chunk_space);
 
 	free_extent_map(em);
 	check_raid56_incompat_flag(info, type);
 	check_raid1c34_incompat_flag(info, type);
 
-	kfree(devices_info);
 	return 0;
 
 error_del_extent:
@@ -5180,7 +5142,55 @@  static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 	free_extent_map(em);
 	/* One for the tree reference */
 	free_extent_map(em);
-error:
+
+	return ret;
+}
+
+static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
+			       u64 start, u64 type)
+{
+	struct btrfs_fs_info *info = trans->fs_info;
+	struct btrfs_fs_devices *fs_devices = info->fs_devices;
+	struct btrfs_device_info *devices_info = NULL;
+	struct alloc_chunk_ctl ctl;
+	int ret;
+
+	if (!alloc_profile_is_valid(type, 0)) {
+		ASSERT(0);
+		return -EINVAL;
+	}
+
+	if (list_empty(&fs_devices->alloc_list)) {
+		if (btrfs_test_opt(info, ENOSPC_DEBUG))
+			btrfs_debug(info, "%s: no writable device", __func__);
+		return -ENOSPC;
+	}
+
+	if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
+		btrfs_err(info, "invalid chunk type 0x%llx requested", type);
+		BUG();
+	}
+
+	ctl.start = start;
+	ctl.type = type;
+	init_alloc_chunk_ctl(fs_devices, &ctl);
+
+	devices_info = kcalloc(fs_devices->rw_devices, sizeof(*devices_info),
+			       GFP_NOFS);
+	if (!devices_info)
+		return -ENOMEM;
+
+	ret = gather_device_info(fs_devices, &ctl, devices_info);
+	if (ret < 0)
+		goto out;
+
+	ret = decide_stripe_size(fs_devices, &ctl, devices_info);
+	if (ret < 0)
+		goto out;
+
+	ret = create_chunk(trans, &ctl, devices_info);
+
+out:
 	kfree(devices_info);
 	return ret;
 }