[PATCH] ext4: enable building of ext4

[deliverable/linux.git] / fs / Kconfig

diff --git a/fs/Kconfig b/fs/Kconfig
index 599de54451af61c3297e4d18b068e5799b36e4b2..ac9ba1c3093534d622bd0557da649359813587d0 100644 (file)
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -140,6 +140,73 @@ config EXT3_FS_SECURITY
          If you are not using a security module that requires using
          extended attributes for file security labels, say N.
 
+config EXT4DEV_FS
+       tristate "Ext4dev/ext4 extended fs support development (EXPERIMENTAL)"
+       depends on EXPERIMENTAL
+        select JBD
+        help
+         Ext4dev is a predecessor filesystem of the next generation
+         extended fs ext4, based on ext3 filesystem code. It will be
+         renamed ext4 fs later, once ext4dev is mature and stabilized.
+
+          Unlike the change from ext2 filesystem to ext3 filesystem,
+          the on-disk format of ext4dev is not the same as ext3 any more:
+         it is based on extent maps and it supports 48-bit physical block
+          numbers. These combined on-disk format changes will allow
+         ext4dev/ext4 to handle more than 16 TB filesystem volumes --
+         a hard limit that ext3 cannot overcome without changing the
+          on-disk format.
+
+         Other than extent maps and 48-bit block numbers, ext4dev also is
+          likely to have other new features such as persistent preallocation,
+         high resolution time stamps, and larger file support etc.  These
+          features will be added to ext4dev gradually.
+
+         To compile this file system support as a module, choose M here. The
+         module will be called ext4dev.  Be aware, however, that the filesystem
+         of your root partition (the one containing the directory /) cannot
+         be compiled as a module, and so this could be dangerous.
+
+         If unsure, say N.
+
+config EXT4DEV_FS_XATTR
+       bool "Ext4dev extended attributes"
+       depends on EXT4DEV_FS
+       default y
+       help
+         Extended attributes are name:value pairs associated with inodes by
+         the kernel or by users (see the attr(5) manual page, or visit
+         <http://acl.bestbits.at/> for details).
+
+         If unsure, say N.
+
+         You need this for POSIX ACL support on ext4dev/ext4.
+
+config EXT4DEV_FS_POSIX_ACL
+       bool "Ext4dev POSIX Access Control Lists"
+       depends on EXT4DEV_FS_XATTR
+       select FS_POSIX_ACL
+       help
+         POSIX Access Control Lists (ACLs) support permissions for users and
+         groups beyond the owner/group/world scheme.
+
+         To learn more about Access Control Lists, visit the POSIX ACLs for
+         Linux website <http://acl.bestbits.at/>.
+
+         If you don't know what Access Control Lists are, say N
+
+config EXT4DEV_FS_SECURITY
+       bool "Ext4dev Security Labels"
+       depends on EXT4DEV_FS_XATTR
+       help
+         Security labels support alternative access control models
+         implemented by security modules like SELinux.  This option
+         enables an extended attribute handler for file security
+         labels in the ext4dev/ext4 filesystem.
+
+         If you are not using a security module that requires using
+         extended attributes for file security labels, say N.
+
 config JBD
        tristate
        help
@@ -173,11 +240,11 @@ config JBD_DEBUG
          "echo 0 > /proc/sys/fs/jbd-debug".
 
 config FS_MBCACHE
-# Meta block cache for Extended Attributes (ext2/ext3)
+# Meta block cache for Extended Attributes (ext2/ext3/ext4)
        tristate
-       depends on EXT2_FS_XATTR || EXT3_FS_XATTR
-       default y if EXT2_FS=y || EXT3_FS=y
-       default m if EXT2_FS=m || EXT3_FS=m
+       depends on EXT2_FS_XATTR || EXT3_FS_XATTR || EXT4DEV_FS_XATTR
+       default y if EXT2_FS=y || EXT3_FS=y || EXT4DEV_FS=y
+       default m if EXT2_FS=m || EXT3_FS=m || EXT4DEV_FS=m
 
 config REISERFS_FS
        tristate "Reiserfs support"