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CONFIG_EXT4DEV_FS: Ext4dev/ext4 extended fs support development (EXPERIMENTAL)

General informations

The Linux kernel configuration item CONFIG_EXT4DEV_FS:

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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.

If unsure, say N.



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