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ext3 文件系统是否允许在挂载时扩展分区？

tag-icon • tag-icon linux partitioning filesystems ext3
ext3 文件系统是否允许在挂载时扩展分区？

我读到 ext3 文件系统可以“在线”扩展。ext3 允许扩展已挂载的分区吗？

我在一次考试中发现了这个奇怪的问题。

答案1

相当新的 Linux 内核（在 2.6 系列的某个时候添加）可以在线扩展 ext3/4 文件系统（即在挂载时）：

localhost root # lvcreate -L100M -n test vg0
  Logical volume "test" created.
localhost root # mkfs.ext4 /dev/vg0/test
mke2fs 1.42.13 (17-May-2015)
Creating filesystem with 102400 1k blocks and 25688 inodes
Filesystem UUID: 1d97763f-7a37-41cc-b2a6-c5b2f93a616a
Superblock backups stored on blocks:
        8193, 24577, 40961, 57345, 73729

Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done

localhost root # mount /dev/vg0/test /mnt/test
localhost root # lvextend -L200M vg0/test
  Size of logical volume vg0/test changed from 100.00 MiB (25 extents) to 200.00 MiB (50 extents).
  Logical volume test successfully resized
localhost root # resize2fs /dev/vg0/test
resize2fs 1.42.13 (17-May-2015)
Filesystem at /dev/vg0/test is mounted on /mnt/test; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
The filesystem on /dev/vg0/test is now 204800 (1k) blocks long.

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