diff options
| -rw-r--r-- | fs/Kconfig | 75 | ||||
| -rw-r--r-- | fs/Makefile | 1 | ||||
| -rw-r--r-- | include/linux/magic.h | 1 |
3 files changed, 73 insertions, 4 deletions
diff --git a/fs/Kconfig b/fs/Kconfig index 599de54451af..ac9ba1c30935 100644 --- 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" diff --git a/fs/Makefile b/fs/Makefile index df614eacee86..64396af37b2a 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -62,6 +62,7 @@ obj-$(CONFIG_DLM) += dlm/ # Do not add any filesystems before this line obj-$(CONFIG_REISERFS_FS) += reiserfs/ obj-$(CONFIG_EXT3_FS) += ext3/ # Before ext2 so root fs can be ext3 +obj-$(CONFIG_EXT4DEV_FS) += ext4/ # Before ext2 so root fs can be ext4dev obj-$(CONFIG_JBD) += jbd/ obj-$(CONFIG_EXT2_FS) += ext2/ obj-$(CONFIG_CRAMFS) += cramfs/ diff --git a/include/linux/magic.h b/include/linux/magic.h index 22036dd2ba36..156c40fc664e 100644 --- a/include/linux/magic.h +++ b/include/linux/magic.h @@ -8,6 +8,7 @@ #define EFS_SUPER_MAGIC 0x414A53 #define EXT2_SUPER_MAGIC 0xEF53 #define EXT3_SUPER_MAGIC 0xEF53 +#define EXT4_SUPER_MAGIC 0xEF53 #define HPFS_SUPER_MAGIC 0xf995e849 #define ISOFS_SUPER_MAGIC 0x9660 #define JFFS2_SUPER_MAGIC 0x72b6 |