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btrfs: fix rw_devices miss match after seed replace
reproducer: reproducer: mount /dev/sdb /btrfs btrfs dev add /dev/sdc /btrfs btrfs rep start -B /dev/sdb /dev/sdd /btrfs umount /btrfs WARNING: CPU: 0 PID: 3882 at fs/btrfs/volumes.c:892 __btrfs_close_devices+0x1c8/0x200 [btrfs]() which is WARN_ON(fs_devices->rw_devices); The problem here is that we did not add one to the rw_devices when we replace the seed device with a writable device. Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: Chris Mason <clm@fb.com>
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@ -562,6 +562,8 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
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if (fs_info->fs_devices->latest_bdev == src_device->bdev)
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fs_info->fs_devices->latest_bdev = tgt_device->bdev;
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list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
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if (src_device->fs_devices->seeding)
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fs_info->fs_devices->rw_devices++;
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/* replace the sysfs entry */
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btrfs_kobj_rm_device(fs_info, src_device);
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