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    This commit adds basic support for the UFS2 filesystem. The UFS2 · 88d85c15
    mckusick authored
    filesystem expands the inode to 256 bytes to make space for 64-bit
    block pointers. It also adds a file-creation time field, an ability
    to use jumbo blocks per inode to allow extent like pointer density,
    and space for extended attributes (up to twice the filesystem block
    size worth of attributes, e.g., on a 16K filesystem, there is space
    for 32K of attributes). UFS2 fully supports and runs existing UFS1
    filesystems. New filesystems built using newfs can be built in either
    UFS1 or UFS2 format using the -O option. In this commit UFS1 is
    the default format, so if you want to build UFS2 format filesystems,
    you must specify -O 2. This default will be changed to UFS2 when
    UFS2 proves itself to be stable. In this commit the boot code for
    reading UFS2 filesystems is not compiled (see /sys/boot/common/ufsread.c)
    as there is insufficient space in the boot block. Once the size of the
    boot block is increased, this code can be defined.
    Things to note: the definition of SBSIZE has changed to SBLOCKSIZE.
    The header file <ufs/ufs/dinode.h> must be included before
    <ufs/ffs/fs.h> so as to get the definitions of ufs2_daddr_t and
    Still TODO:
    Verify that the first level bootstraps work for all the architectures.
    Convert the utility ffsinfo to understand UFS2 and test growfs.
    Add support for the extended attribute storage. Update soft updates
    to ensure integrity of extended attribute storage. Switch the
    current extended attribute interfaces to use the extended attribute
    storage. Add the extent like functionality (framework is there,
    but is currently never used).
    Sponsored by: DARPA & NAI Labs.
    Reviewed by:	Poul-Henning Kamp <>