[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>
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Mingming Cao
Linus Torvalds
parent
617ba13b31
commit
02ea2104c5
3 changed files with 73 additions and 4 deletions
75
fs/Kconfig
75
fs/Kconfig
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@ -140,6 +140,73 @@ config EXT3_FS_SECURITY
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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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config EXT4DEV_FS
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tristate "Ext4dev/ext4 extended fs support development (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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select JBD
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help
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Ext4dev is a predecessor filesystem of the next generation
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extended fs ext4, based on ext3 filesystem code. It will be
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renamed ext4 fs later, once ext4dev is mature and stabilized.
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Unlike the change from ext2 filesystem to ext3 filesystem,
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the on-disk format of ext4dev is not the same as ext3 any more:
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it is based on extent maps and it supports 48-bit physical block
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numbers. These combined on-disk format changes will allow
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ext4dev/ext4 to handle more than 16 TB filesystem volumes --
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a hard limit that ext3 cannot overcome without changing the
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on-disk format.
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Other than extent maps and 48-bit block numbers, ext4dev also is
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likely to have other new features such as persistent preallocation,
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high resolution time stamps, and larger file support etc. These
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features will be added to ext4dev gradually.
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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 ext4dev. Be aware, however, that the filesystem
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of your root partition (the one containing the directory /) cannot
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be compiled as a module, and so this could be dangerous.
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If unsure, say N.
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config EXT4DEV_FS_XATTR
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bool "Ext4dev extended attributes"
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depends on EXT4DEV_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 ext4dev/ext4.
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config EXT4DEV_FS_POSIX_ACL
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bool "Ext4dev POSIX Access Control Lists"
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depends on EXT4DEV_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 EXT4DEV_FS_SECURITY
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bool "Ext4dev Security Labels"
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depends on EXT4DEV_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 ext4dev/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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config JBD
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tristate
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help
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@ -173,11 +240,11 @@ config JBD_DEBUG
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"echo 0 > /proc/sys/fs/jbd-debug".
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config FS_MBCACHE
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# Meta block cache for Extended Attributes (ext2/ext3)
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# Meta block cache for Extended Attributes (ext2/ext3/ext4)
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tristate
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depends on EXT2_FS_XATTR || EXT3_FS_XATTR
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default y if EXT2_FS=y || EXT3_FS=y
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default m if EXT2_FS=m || EXT3_FS=m
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depends on EXT2_FS_XATTR || EXT3_FS_XATTR || EXT4DEV_FS_XATTR
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default y if EXT2_FS=y || EXT3_FS=y || EXT4DEV_FS=y
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default m if EXT2_FS=m || EXT3_FS=m || EXT4DEV_FS=m
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config REISERFS_FS
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tristate "Reiserfs support"
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@ -62,6 +62,7 @@ obj-$(CONFIG_DLM) += dlm/
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# Do not add any filesystems before this line
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obj-$(CONFIG_REISERFS_FS) += reiserfs/
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obj-$(CONFIG_EXT3_FS) += ext3/ # Before ext2 so root fs can be ext3
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obj-$(CONFIG_EXT4DEV_FS) += ext4/ # Before ext2 so root fs can be ext4dev
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obj-$(CONFIG_JBD) += jbd/
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obj-$(CONFIG_EXT2_FS) += ext2/
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obj-$(CONFIG_CRAMFS) += cramfs/
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@ -8,6 +8,7 @@
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#define EFS_SUPER_MAGIC 0x414A53
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#define EXT2_SUPER_MAGIC 0xEF53
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#define EXT3_SUPER_MAGIC 0xEF53
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#define EXT4_SUPER_MAGIC 0xEF53
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#define HPFS_SUPER_MAGIC 0xf995e849
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#define ISOFS_SUPER_MAGIC 0x9660
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#define JFFS2_SUPER_MAGIC 0x72b6
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