On Mon, May 26, 2014 at 05:30:25PM +0800, Anand Jain wrote:
> when we replace the device its corresponding sysfs
> entry has to be replaced as well
> 
> Signed-off-by: Anand Jain <anand.j...@oracle.com>
> ---
>  fs/btrfs/dev-replace.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
> index 9f22905..f4f8728 100644
> --- a/fs/btrfs/dev-replace.c
> +++ b/fs/btrfs/dev-replace.c
> @@ -36,6 +36,7 @@
>  #include "check-integrity.h"
>  #include "rcu-string.h"
>  #include "dev-replace.h"
> +#include "sysfs.h"
>  
>  static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
>                                      int scrub_ret);
> @@ -562,6 +563,10 @@ static int btrfs_dev_replace_finishing(struct 
> btrfs_fs_info *fs_info,
>               fs_info->fs_devices->latest_bdev = tgt_device->bdev;
>       list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
>  
> +     /* replace the sysfs entry */
> +     rm_device_membership(fs_info, src_device);
> +     add_device_membership(fs_info, tgt_device);
> +
>       btrfs_rm_dev_replace_blocked(fs_info);
>  
>       btrfs_rm_dev_replace_srcdev(fs_info, src_device);

569         btrfs_rm_dev_replace_unblocked(fs_info);
570

The comment that follows says

571         /*
572          * this is again a consistent state where no dev_replace procedure
573          * is running, the target device is part of the filesystem, the
574          * source device is not part of the filesystem anymore and its 1st
575          * superblock is scratched out so that it is no longer marked to
576          * belong to this filesystem.
577          */

and I think this is the right place to put the sysfs updates, because the
srcdev is processed.
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