On 27.11.18 г. 10:38 ч., Qu Wenruo wrote:
> We have btrfs_alloc_dev_extent() accepting @convert flag to toggle
> special handling for convert.
>
> However that @convert flag only determine whether we call
> find_free_dev_extent(), and we may later need to insert dev extents
> without searching dev tree.
>
> So refactor btrfs_alloc_dev_extent() into 2 functions,
> btrfs_alloc_dev_extent(), which will try to find free dev extent, and
> btrfs_insert_dev_extent(), which will just insert a dev extent.
>
> For implementation, btrfs_alloc_dev_extent() will call
> btrfs_insert_dev_extent() anyway, so no duplicated code.
>
> This removes the need of @convert parameter, and make
> btrfs_insert_dev_extent() public for later usage.
>
> Signed-off-by: Qu Wenruo <w...@suse.com>
This looks much better:
Reviewed-by: Nikolay Borisov <nbori...@suse.com>
> ---
> volumes.c | 48 ++++++++++++++++++++++++++++++------------------
> volumes.h | 3 +++
> 2 files changed, 33 insertions(+), 18 deletions(-)
>
> diff --git a/volumes.c b/volumes.c
> index 30090ce5f8e8..0dd082cd1718 100644
> --- a/volumes.c
> +++ b/volumes.c
> @@ -530,10 +530,12 @@ static int find_free_dev_extent(struct btrfs_device
> *device, u64 num_bytes,
> return find_free_dev_extent_start(device, num_bytes, 0, start, len);
> }
>
> -static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
> - struct btrfs_device *device,
> - u64 chunk_offset, u64 num_bytes, u64 *start,
> - int convert)
> +/*
> + * Insert one device extent into the fs.
> + */
> +int btrfs_insert_dev_extent(struct btrfs_trans_handle *trans,
> + struct btrfs_device *device,
> + u64 chunk_offset, u64 num_bytes, u64 start)
> {
> int ret;
> struct btrfs_path *path;
> @@ -546,18 +548,8 @@ static int btrfs_alloc_dev_extent(struct
> btrfs_trans_handle *trans,
> if (!path)
> return -ENOMEM;
>
> - /*
> - * For convert case, just skip search free dev_extent, as caller
> - * is responsible to make sure it's free.
> - */
> - if (!convert) {
> - ret = find_free_dev_extent(device, num_bytes, start, NULL);
> - if (ret)
> - goto err;
> - }
> -
> key.objectid = device->devid;
> - key.offset = *start;
> + key.offset = start;
> key.type = BTRFS_DEV_EXTENT_KEY;
> ret = btrfs_insert_empty_item(trans, root, path, &key,
> sizeof(*extent));
> @@ -583,6 +575,22 @@ err:
> return ret;
> }
>
> +/*
> + * Allocate one free dev extent and insert it into the fs.
> + */
> +static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
> + struct btrfs_device *device,
> + u64 chunk_offset, u64 num_bytes, u64 *start)
> +{
> + int ret;
> +
> + ret = find_free_dev_extent(device, num_bytes, start, NULL);
> + if (ret)
> + return ret;
> + return btrfs_insert_dev_extent(trans, device, chunk_offset, num_bytes,
> + *start);
> +}
> +
> static int find_next_chunk(struct btrfs_fs_info *fs_info, u64 *offset)
> {
> struct btrfs_root *root = fs_info->chunk_root;
> @@ -1107,7 +1115,7 @@ again:
> list_move_tail(&device->dev_list, dev_list);
>
> ret = btrfs_alloc_dev_extent(trans, device, key.offset,
> - calc_size, &dev_offset, 0);
> + calc_size, &dev_offset);
> if (ret < 0)
> goto out_chunk_map;
>
> @@ -1241,8 +1249,12 @@ int btrfs_alloc_data_chunk(struct btrfs_trans_handle
> *trans,
> while (index < num_stripes) {
> struct btrfs_stripe *stripe;
>
> - ret = btrfs_alloc_dev_extent(trans, device, key.offset,
> - calc_size, &dev_offset, convert);
> + if (convert)
> + ret = btrfs_insert_dev_extent(trans, device, key.offset,
> + calc_size, dev_offset);
> + else
> + ret = btrfs_alloc_dev_extent(trans, device, key.offset,
> + calc_size, &dev_offset);
> BUG_ON(ret);
>
> device->bytes_used += calc_size;
> diff --git a/volumes.h b/volumes.h
> index b4ea93f0bec3..44284ee75adb 100644
> --- a/volumes.h
> +++ b/volumes.h
> @@ -268,6 +268,9 @@ int btrfs_open_devices(struct btrfs_fs_devices
> *fs_devices,
> int flags);
> int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
> void btrfs_close_all_devices(void);
> +int btrfs_insert_dev_extent(struct btrfs_trans_handle *trans,
> + struct btrfs_device *device,
> + u64 chunk_offset, u64 num_bytes, u64 start);
> int btrfs_add_device(struct btrfs_trans_handle *trans,
> struct btrfs_fs_info *fs_info,
> struct btrfs_device *device);
>
