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ext3
ext3 (third extended filesystem) is an open source disk filesystem created for Linux, its driver being discontinued since linux 4.3.
Installation
Kernel
Activate the following kernel options for ext3 support:
File systems ---> <*> Ext3 journalling file system support
Support for optional ext3 features:
File systems ---> [*] Default to 'data=ordered' in ext3 [*] Ext3 extended attributes [*] Ext3 POSIX Access Control Lists [*] Ext3 Security Labels
| Option | Description |
|---|---|
| Default to 'data=ordered' in ext3 | |
| Ext3 extended attributes | Extended attributes are name:value pairs associated with inodes by the kernel or by users. See http://acl.bestbits.at/ |
| Ext3 POSIX Access Control Lists | Posix Access Control Lists (ACLs) support permissions for users and groups beyond the owner/group/world scheme. See http://acl.bestbits.at/ |
| Ext3 Security Labels | Enables an extended attribute handler for file security. |
Large drive support
When the system has large disks (2 TB or greater) and a 32-bit (x86) kernel is being used, the following option must be enabled:
-*- Enable the block layer ---> [*] Support for large (2TB+) block devices and files
USE flags
The sys-fs/e2fsprogs package contains the utilities to work with the filesystem. In Gentoo Linux sys-fs/e2fsprogs is part of the system set and should be already installed on the system.
USE flags for sys-fs/e2fsprogs Standard EXT2/EXT3/EXT4 filesystem utilities
+tools
|
Build extfs tools (mke2fs, e2fsck, tune2fs, etc.) |
archive
|
Add support for mke2fs to read a tarball as input. This allows not needing privileges. Needs app-arch/libarchive. |
cron
|
Install e2scrub_all cron script |
fuse
|
Build fuse2fs, a FUSE file system client for ext2/ext3/ext4 file systems |
nls
|
Add Native Language Support (using gettext - GNU locale utilities) |
static-libs
|
Build static versions of dynamic libraries as well |
test
|
Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently) |
Emerge
After setting the USE flag update the system so the changes take effect:
root #emerge --ask --changed-use --deep @worldUsage
Creation
The mkfs.ext3 command irreversibly destroys any content of the partition it is told to format. Be sure to select the right partition!
To create an ext3 filesystem on the /dev/sda1 partition:
root #mkfs.ext3 /dev/sda1Please replace /dev/sda1 with the actual partition to format.
By default, 5% of available disk space is reserved for the root user. This is usually a good thing for the partition where the / directory is mounted, but it may be not desirable on other partitions. To lose reserve disk space for the root user use mkfs.ext3's -m 0 option:
root #mkfs.ext3 -m 0 /dev/sda1External resources
- http://ext4.wiki.kernel.org - The second, third, and fourth extended file system wiki.
- http://article.gmane.org/gmane.linux.kernel/2031297