2008-10-21 02:28:45 +08:00
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config EXT4_FS
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tristate "The Extended 4 (ext4) filesystem"
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select JBD2
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select CRC16
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help
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This is the next generation of the ext3 filesystem.
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Unlike the change from ext2 filesystem to ext3 filesystem,
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the on-disk format of ext4 is not forwards compatible with
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ext3; it is based on extent maps and it supports 48-bit
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physical block numbers. The ext4 filesystem also supports delayed
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allocation, persistent preallocation, high resolution time stamps,
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and a number of other features to improve performance and speed
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up fsck time. For more information, please see the web pages at
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http://ext4.wiki.kernel.org.
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The ext4 filesystem will support mounting an ext3
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filesystem; while there will be some performance gains from
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the delayed allocation and inode table readahead, the best
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performance gains will require enabling ext4 features in the
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2009-01-26 18:12:25 +08:00
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filesystem, or formatting a new filesystem as an ext4
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2008-10-21 02:28:45 +08:00
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filesystem initially.
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To compile this file system support as a module, choose M here. The
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module will be called ext4.
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If unsure, say N.
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2009-12-08 03:08:51 +08:00
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config EXT4_USE_FOR_EXT23
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bool "Use ext4 for ext2/ext3 file systems"
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2009-12-21 23:54:09 +08:00
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depends on EXT4_FS
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2009-12-10 10:09:58 +08:00
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depends on EXT3_FS=n || EXT2_FS=n
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2009-12-08 03:08:51 +08:00
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default y
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help
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Allow the ext4 file system driver code to be used for ext2 or
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ext3 file system mounts. This allows users to reduce their
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compiled kernel size by using one file system driver for
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ext2, ext3, and ext4 file systems.
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2008-10-21 02:28:45 +08:00
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config EXT4_FS_XATTR
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bool "Ext4 extended attributes"
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depends on EXT4_FS
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default y
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help
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Extended attributes are name:value pairs associated with inodes by
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the kernel or by users (see the attr(5) manual page, or visit
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<http://acl.bestbits.at/> for details).
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If unsure, say N.
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You need this for POSIX ACL support on ext4.
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config EXT4_FS_POSIX_ACL
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bool "Ext4 POSIX Access Control Lists"
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depends on EXT4_FS_XATTR
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select FS_POSIX_ACL
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help
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POSIX Access Control Lists (ACLs) support permissions for users and
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groups beyond the owner/group/world scheme.
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To learn more about Access Control Lists, visit the POSIX ACLs for
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Linux website <http://acl.bestbits.at/>.
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If you don't know what Access Control Lists are, say N
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config EXT4_FS_SECURITY
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bool "Ext4 Security Labels"
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depends on EXT4_FS_XATTR
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help
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Security labels support alternative access control models
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implemented by security modules like SELinux. This option
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enables an extended attribute handler for file security
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labels in the ext4 filesystem.
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If you are not using a security module that requires using
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extended attributes for file security labels, say N.
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2009-09-19 01:38:55 +08:00
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config EXT4_DEBUG
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bool "EXT4 debugging support"
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depends on EXT4_FS
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help
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Enables run-time debugging support for the ext4 filesystem.
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If you select Y here, then you will be able to turn on debugging
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with a command such as "echo 1 > /sys/kernel/debug/ext4/mballoc-debug"
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