resize2fs: Bad magic number in super-block while trying to open详解程序员

os: centos 7.4

[[email protected] ~]# pvs 
  PV         VG     Fmt  Attr PSize   PFree  
  /dev/sda2  centos lvm2 a--  <19.00g     0  
  /dev/sda3  centos lvm2 a--  <30.00g <2.00g 
[[email protected] ~]# vgs 
  VG     #PV #LV #SN Attr   VSize  VFree  
  centos   2   2   0 wz--n- 48.99g <2.00g 
[[email protected] ~]# lvs 
  LV   VG     Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert 
  root centos -wi-ao---- <45.00g                                                     
  swap centos -wi-ao----   2.00g  
[[email protected] ~]# df -hT 
Filesystem              Type      Size  Used Avail Use% Mounted on 
/dev/mapper/centos-root xfs        17G  5.5G   12G  33% / 
devtmpfs                devtmpfs  985M     0  985M   0% /dev 
tmpfs                   tmpfs    1001M     0 1001M   0% /dev/shm 
tmpfs                   tmpfs    1001M  8.8M  992M   1% /run 
tmpfs                   tmpfs    1001M     0 1001M   0% /sys/fs/cgroup 
/dev/sda1               xfs      1014M  160M  855M  16% /boot 
tmpfs                   tmpfs     201M  8.0K  201M   1% /run/user/42 
tmpfs                   tmpfs     201M     0  201M   0% /run/user/0

使用 resize2fs时，提示错误

[[email protected] ~]# resize2fs /dev/mapper/centos-root  
resize2fs 1.42.9 (28-Dec-2013) 
resize2fs: Bad magic number in super-block while trying to open /dev/mapper/centos-root 
Couldn't find valid filesystem superblock.

了解后发现，xfs格式的文件扩充需要使用 xfs_growfs

[root@node1 ~]# xfs 
xfs_admin      xfs_db         xfs_freeze     xfs_info       xfs_logprint   xfs_mkfile     xfs_repair      
xfs_bmap       xfsdump        xfs_fsr        xfsinvutil     xfs_mdrestore  xfs_ncheck     xfsrestore      
xfs_copy       xfs_estimate   xfs_growfs     xfs_io         xfs_metadump   xfs_quota      xfs_rtcp        
[root@node1 ~]# xfs_growfs /dev/mapper/centos-root 
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=1113856 blks 
         =                       sectsz=512   attr=2, projid32bit=1 
         =                       crc=1        finobt=0 spinodes=0 
data     =                       bsize=4096   blocks=4455424, imaxpct=25 
         =                       sunit=0      swidth=0 blks 
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1 
log      =internal               bsize=4096   blocks=2560, version=2 
         =                       sectsz=512   sunit=0 blks, lazy-count=1 
realtime =none                   extsz=4096   blocks=0, rtextents=0 
data blocks changed from 4455424 to 11795456

[root@node1 ~]# df -hT 
Filesystem              Type      Size  Used Avail Use% Mounted on 
/dev/mapper/centos-root xfs        45G  5.5G   40G  13% / 
devtmpfs                devtmpfs  985M     0  985M   0% /dev 
tmpfs                   tmpfs    1001M     0 1001M   0% /dev/shm 
tmpfs                   tmpfs    1001M  8.8M  992M   1% /run 
tmpfs                   tmpfs    1001M     0 1001M   0% /sys/fs/cgroup 
/dev/sda1               xfs      1014M  160M  855M  16% /boot 
tmpfs                   tmpfs     201M  8.0K  201M   1% /run/user/42 
tmpfs                   tmpfs     201M     0  201M   0% /run/user/0