6.2. Mounting an Ext4 File System
An ext4 file system can be mounted with no extra options. For example:
# mount /dev/device /mount/point
The ext4 file system also supports several mount options to influence behavior. For example, the
acl
parameter enables access control lists, while the user_xattr
parameter enables user extended attributes. To enable both options, use their respective parameters with -o
, as in:
# mount -o acl,user_xattr /dev/device /mount/point
The
tune2fs
utility also allows administrators to set default mount options in the file system superblock. For more information on this, refer to man tune2fs
.
Write Barriers
By default, ext4 uses write barriers to ensure file system integrity even when power is lost to a device with write caches enabled. For devices without write caches, or with battery-backed write caches, disable barriers using the
nobarrier
option, as in:
# mount -o nobarrier /dev/device /mount/point
For more information about write barriers, refer to Chapter 22, Write Barriers.