[PATCH 3/6 v2] btrfs: dev add should add its sysfs entry

[Anand Jain]

we would need the device links to be created,
when device is added.

Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
 v2: the function name change applied here

 fs/btrfs/sysfs.c   | 12 +++++++++---
 fs/btrfs/sysfs.h   |  2 ++
 fs/btrfs/volumes.c |  5 +++++
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 4100771..9733cfc 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -592,14 +592,17 @@ int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info,
        return 0;
 }
 
-static int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info)
+int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
+               struct btrfs_device *one_device)
 {
        int error = 0;
        struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
        struct btrfs_device *dev;
 
-       fs_info->device_dir_kobj = kobject_create_and_add("devices",
+       if (!fs_info->device_dir_kobj)
+               fs_info->device_dir_kobj = kobject_create_and_add("devices",
                                                &fs_info->super_kobj);
+
        if (!fs_info->device_dir_kobj)
                return -ENOMEM;
 
@@ -610,6 +613,9 @@ static int btrfs_kobj_add_device(struct btrfs_fs_info 
*fs_info)
                if (!dev->bdev)
                        continue;
 
+               if (one_device && one_device != dev)
+                       continue;
+
                disk = dev->bdev->bd_part;
                disk_kobj = &part_to_dev(disk)->kobj;
 
@@ -653,7 +659,7 @@ int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
        if (error)
                goto failure;
 
-       error = btrfs_kobj_add_device(fs_info);
+       error = btrfs_kobj_add_device(fs_info, NULL);
        if (error)
                goto failure;
 
diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h
index 529554e..ac46df3 100644
--- a/fs/btrfs/sysfs.h
+++ b/fs/btrfs/sysfs.h
@@ -66,6 +66,8 @@ char *btrfs_printable_features(enum btrfs_feature_set set, 
u64 flags);
 extern const char * const btrfs_feature_set_names[3];
 extern struct kobj_type space_info_ktype;
 extern struct kobj_type btrfs_raid_ktype;
+int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
+               struct btrfs_device *one_device);
 int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info,
                 struct btrfs_device *one_device);
 #endif /* _BTRFS_SYSFS_H_ */
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 5f434d7..4a66e6b 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2101,6 +2101,10 @@ int btrfs_init_new_device(struct btrfs_root *root, char 
*device_path)
        total_bytes = btrfs_super_num_devices(root->fs_info->super_copy);
        btrfs_set_super_num_devices(root->fs_info->super_copy,
                                    total_bytes + 1);
+
+       /* add sysfs device entry */
+       btrfs_kobj_add_device(root->fs_info, device);
+
        mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
 
        if (seeding_dev) {
@@ -2161,6 +2165,7 @@ error_trans:
        unlock_chunks(root);
        btrfs_end_transaction(trans, root);
        rcu_string_free(device->name);
+       btrfs_kobj_rm_device(root->fs_info, device);
        kfree(device);
 error:
        blkdev_put(bdev, FMODE_EXCL);
-- 
1.8.5.3

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