On Thu, 05 Oct 2006 17:36:11 -0700 akpm@xxxxxxxx wrote: > Subject: ext4: enable building of ext4 > From: Mingming Cao<cmm@xxxxxxxxxx> > > Originally part of a patch from Mingming Cao and Randy Dunlap. Reorganized > by Shaggy. > --- > > fs/Kconfig | 75 +++++++++++++++++++++++++++++++++++++--- > fs/Makefile | 1 > include/linux/magic.h | 1 > 3 files changed, 73 insertions(+), 4 deletions(-) > > diff -puN fs/Kconfig~ext4-enable fs/Kconfig > --- a/fs/Kconfig~ext4-enable > +++ a/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 ugh, I'm getting seasick from looking at that indentation. I don't have an ext4 patchset ATM, but I'll fix that if no one else does. > + 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. --- ~Randy - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
