[PATCH] ext4: enable building of ext4
Originally part of a patch from Mingming Cao and Randy Dunlap. Reorganized
by Shaggy.
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Mingming Cao<cmm@us.ibm.com>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/Kconfig b/fs/Kconfig
index 599de54..ac9ba1c 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -140,6 +140,73 @@
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 @@
"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"