Btrfs: sysfs: add support to show replacing target in the sysfs

This patch will add support to show the replacing target in sysfs
during the process of replacement.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

2 files changed, 7 insertions, 1 deletions

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index f982ef303f1c..862fbc206755 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -376,6 +376,10 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
         WARN_ON(!tgt_device);
         dev_replace->tgtdev = tgt_device;
 
+        ret = btrfs_kobj_add_device(tgt_device->fs_devices, tgt_device);
+        if (ret)
+                btrfs_error(root->fs_info, ret, "kobj add dev failed");
+
         printk_in_rcu(KERN_INFO
                       "BTRFS: dev_replace from %s (devid %llu) to %s started\n",
                       src_device->missing ? "<missing disk>" :
@@ -584,7 +588,6 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
 
         /* replace the sysfs entry */
         btrfs_kobj_rm_device(fs_info->fs_devices, src_device);
-        btrfs_kobj_add_device(fs_info->fs_devices, tgt_device);
         btrfs_rm_dev_replace_free_srcdev(fs_info, src_device);
 
         /* write back the superblocks */
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index ea293db89cc4..2d9061f078ca 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1940,6 +1940,9 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
         mutex_lock(&uuid_mutex);
         WARN_ON(!tgtdev);
         mutex_lock(&fs_info->fs_devices->device_list_mutex);
+
+        btrfs_kobj_rm_device(fs_info->fs_devices, tgtdev);
+
         if (tgtdev->bdev) {
                 btrfs_scratch_superblock(tgtdev);
                 fs_info->fs_devices->open_devices--;