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5.2. Mounting an ext4 File System

An ext4 file system can be mounted with no extra options. For example: 
# mount /dev/device /mount/pointmount /dev/device /mount/pointmount /dev/device /mount/pointmount /dev/device /mount/point
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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/pointmount -o acl,user_xattr /dev/device /mount/pointmount -o acl,user_xattr /dev/device /mount/pointmount -o acl,user_xattr /dev/device /mount/point
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As with ext3, the option data_err=abort can be used to abort the journal if an error occurs in file data. 
# mount -o data_err=abort /dev/device /mount/pointmount -o data_err=abort /dev/device /mount/pointmount -o data_err=abort /dev/device /mount/pointmount -o data_err=abort /dev/device /mount/pointmount -o data_err=abort /dev/device /mount/pointmount -o data_err=abort /dev/device /mount/pointmount -o data_err=abort /dev/device /mount/pointmount -o data_err=abort /dev/device /mount/point
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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
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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/pointmount -o nobarrier /dev/device /mount/pointmount -o nobarrier /dev/device /mount/pointmount -o nobarrier /dev/device /mount/point
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For more information about write barriers, refer to Chapter 22, Write Barriers.

Direct Access Technology Preview
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Starting with Red Hat Enterprise Linux 7.3, Direct Access (DAX) provides, as a Technology Preview on the ext4 and XFS file systems, a means for an application to directly map persistent memory into its address space. To use DAX, a system must have some form of persistent memory available, usually in the form of one or more Non-Volatile Dual In-line Memory Modules (NVDIMMs), and a file system that supports DAX must be created on the NVDIMM(s). Also, the file system must be mounted with the dax mount option. Then, an mmap of a file on the dax-mounted file system results in a direct mapping of storage into the application's address space.
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