LVM+Btrfs如何调整分区大小?

有人知道就顺便解释一下lvm吧,小白再此。

问题已关闭[Taptalk改不了标题],因为我直接格式化了,我的42.2有很多不大不小的烦人问题(例如xorg定时花屏,nouveau动不动崩溃,终端不支持中文显示,steam一玩游戏就崩溃),直接重装了…

想双系统(SUSE 系搞桌面音频工作站 DAW 不启动,不熟悉命令,打算换回 Debian 系),但是当我试图划分空间时出问题了。由于是 LVM+Btrfs,gparted 不认 LVM 下面的 Btrfs(已安装 btrfs-progs 及 btrfs-tools,使用 Linux Deepin 的 LiveCD)。切换回大蜥蜴,试着从 /home 划出 30g 空间
sudo btrfs filesystem resize 42g /home

结束以后,发现并没有空出地方来,用 gnome disk 查看发现磁盘空间占用率反而增加了,用 vgdisplay 也没看到 lvm 存在可分配空间…… :nauseated_face:
— Volume group —
VG Name system
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 7
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 117.23 GiB
PE Size 4.00 MiB
Total PE 30011
Alloc PE / Size 30010 / 117.23 GiB
Free PE / Size 1 / 4.00 MiB
VG UUID Q0Ngv6-UTXN-yAH4-sE0b-f6O7-U6v5-GK4ffA

求解如何把 btrfs 中空闲空间从 lvm 中释放出来,谢谢!

看到空闲空间了

lvm> pvdisplay -v -m
    Wiping internal VG cache
    Wiping cache of LVM-capable devices
  --- Physical volume ---
  PV Name               /dev/sdb2
  VG Name               system
  PV Size               40.00 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              10240
  Free PE               0
  Allocated PE          10240
  PV UUID               q6PbM9-ffo2-D47W-iH2n-Iafk-954y-MIPZgU
   
  --- Physical Segments ---
  Physical extent 0 to 10239:
    Logical volume	/dev/system/root
    Logical extents	0 to 10239
   
  --- Physical volume ---
  PV Name               /dev/sdb3
  VG Name               system
  PV Size               77.23 GiB / not usable 2.00 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              19771
  Free PE               6971
  Allocated PE          12800
  PV UUID               8SnfGN-4X0h-aK8Q-6S27-hUfw-jx5g-YPoHrI
   
  --- Physical Segments ---
  Physical extent 0 to 10239:
    Logical volume	/dev/system/home
    Logical extents	0 to 10239
  Physical extent 10240 to 15929:
    FREE
  Physical extent 15930 to 18489:
    Logical volume	/dev/system/root
    Logical extents	10240 to 12799
  Physical extent 18490 to 19770:
    FREE