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documentation/content/en/books/handbook/filesystems/_index.adoc

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	[[filesystems-linux]]			[[filesystems-linux]]
	== Linux(R) File Systems			== Linux(R) File Systems

	FreeBSD provides built-in support for several Linux(R) file systems.			FreeBSD provides built-in support for several Linux(R) file systems.
	This section demonstrates how to load support for and how to mount the supported Linux(R) file systems.			This section demonstrates how to load support for and how to mount the supported Linux(R) file systems.

	=== ext2			=== ext2

				The man:ext2fs[5] driver allows the FreeBSD kernel to both read and write to ext2 file systems.

	Kernel support for ext2 file systems has been available since FreeBSD 2.2.			Kernel support for ext2 file systems has been available since FreeBSD 2.2.
	In FreeBSD 8.x and earlier, the code is licensed under the GPL.			In FreeBSD 8.x and earlier, the code was licensed under the GPL.
	Since FreeBSD 9.0, the code has been rewritten and is now BSD licensed.			Since FreeBSD 9.0, the code has been rewritten and is now BSD licensed.
				Starting with FreeBSD 12.1-RELEASE, a DTrace provider is available.

	The man:ext2fs[5] driver allows the FreeBSD kernel to both read and write to ext2 file systems.			[WARNING]

	[NOTE]
	====			====
	This driver can also be used to access ext3 and ext4 file systems.			This driver can also be used to access ext3 and ext4 file systems.
	The man:ext2fs[5] filesystem has full read and write support for ext4 as of FreeBSD 12.0-RELEASE.			The man:ext2fs[5] filesystem has read and write support for ext3 and ext4 as of FreeBSD 12.0-RELEASE, while prior versions of FreeBSD can access ext3 and ext4 in read-only mode using package:sysutils/fusefs-ext2[].
	Additionally, extended attributes and ACLs are also supported, while journalling and encryption are not.			Although the man:ext2fs[5] driver supports extended attributes and ACLs, journalling and encryption are not; therefore when accessing an ext3 or ext4 filesystem, it is recommended to mount the filesystem read-only.
				pauamma_gundo.comUnsubmitted Done Inline Actions Is that warning applicable to base system support, to sysutils/fusefs-ext2, or both? (Given its position in the text and with no indication of scope, it reads as applicable to sysutils/fusefs-ext2 only.) pauamma_gundo.com: Is that warning applicable to base system support, to sysutils/fusefs-ext2, or both? (Given its…
				ceriAuthorUnsubmitted Done Inline Actions Clarified; thanks. It's supposed to apply to both. I want to discourage people from using read-write support at all, I think. ceri: Clarified; thanks. It's supposed to apply to both. I want to discourage people from using…
				pauamma_gundo.comUnsubmitted Not Done Inline Actions I see you also removed "Starting with FreeBSD 12.1-RELEASE, a DTrace provider will be available as well." but the review summary doesn't explain why. Accidental overdeletion? pauamma_gundo.com: I see you also removed "Starting with FreeBSD 12.1-RELEASE, a DTrace provider will be available…
				ceriAuthorUnsubmitted Done Inline Actions It wasn't appropriate for a WARNING, so I moved it higher up - see new line 89. ceri: It wasn't appropriate for a WARNING, so I moved it higher up - see new line 89.
				pauamma_gundo.comUnsubmitted Done Inline Actions Oh, right, missed it. pauamma_gundo.com: Oh, right, missed it.
	Starting with FreeBSD 12.1-RELEASE, a DTrace provider will be available as well.
	Prior versions of FreeBSD can access ext4 in read and write mode using package:sysutils/fusefs-ext2[].
	====			====

	To access an ext file system, first load the kernel loadable module:			To access an ext file system, first load the kernel loadable module:

	[source,shell]			[source,shell]
	....			....
	# kldload ext2fs			# kldload ext2fs
	....			....

	Then, mount the ext volume by specifying its FreeBSD partition name and an existing mount point.			Then, mount the ext volume by specifying its FreeBSD partition name and an existing mount point.
	This example mounts [.filename]#/dev/ad1s1# on [.filename]#/mnt#:			This example mounts [.filename]#/dev/ad1s1# on [.filename]#/mnt#:

	[source,shell]			[source,shell]
	....			....
	# mount -t ext2fs /dev/ad1s1 /mnt			# mount -t ext2fs /dev/ad1s1 /mnt
	....			....

				To mount an ext volume read-only, include the `-o ro` option:
				[source,shell]
				....
				# mount -t ext2fs -o ro /dev/ad1s1 /mnt
				....