On Mon, May 02, 2016 at 07:02:08AM +0800, Anand Jain wrote:
> --- a/fs/btrfs/dev-replace.c
> +++ b/fs/btrfs/dev-replace.c
> @@ -569,11 +569,9 @@ static int btrfs_dev_replace_finishing(struct
> btrfs_fs_info *fs_info,
> ASSERT(list_empty(&src_device->resized_list));
> tgt_device->commit_total_bytes = src_device->commit_total_bytes;
> tgt_device->commit_bytes_used = src_device->bytes_used;
> - if (fs_info->sb->s_bdev &&
> - (fs_info->sb->s_bdev == src_device->bdev))
> - fs_info->sb->s_bdev = tgt_device->bdev;
What's the base of this patch? The above code is not in my for-next so
I could be missing some important bits.
> - if (fs_info->fs_devices->latest_bdev == src_device->bdev)
> - fs_info->fs_devices->latest_bdev = tgt_device->bdev;
> +
> + btrfs_assign_next_active_device(fs_info, src_device, tgt_device);
> +
> list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
> fs_info->fs_devices->rw_devices++;
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 5f70c1235466..0bb15da2da40 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -1742,10 +1742,49 @@ out:
> return ret;
> }
>
> +struct btrfs_device *btrfs_find_next_active_device(struct btrfs_fs_devices
> *fs_devs,
> + struct btrfs_device *device)
> +{
> + struct btrfs_device *next_device;
> +
> + list_for_each_entry(next_device, &fs_devs->devices, dev_list) {
> + if (next_device != device &&
> + !next_device->missing && next_device->bdev)
> + return next_device;
> + }
> + return NULL;
> +}
> +
> +/*
> + * Helper function to check if the given device is part of
> + * s_bdev / latest_bdev and replace it with the provided or
> + * the next active device, in the context where this function
> + * called, there should be always be another device which is
> + * active.
> + */
> +void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info,
> + struct btrfs_device *device, struct btrfs_device *this_dev)
> +{
> + struct btrfs_device *next_device;
> +
> + if (this_dev)
> + next_device = this_dev;
> + else
> + next_device = btrfs_find_next_active_device(fs_info->fs_devices,
> + device);
> + BUG_ON(!next_device); /* Logic error */
Please make it an ASSERT.
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