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  • kib's avatar
    Reduce size of ufs inode. · 20f1e8ac
    kib authored
    Remove redunand i_dev and i_fs pointers, which are available as
    ip->i_ump->um_dev and ip->i_ump->um_fs, and reorder members by size to
    reduce padding.  To compensate added derefences, the most often i_ump
    access to differentiate between UFS1 and UFS2 dinode layout is
    removed, by addition of the new i_flag IN_UFS2.  Overall, this
    actually reduces the amount of memory dereferences.
    On 64bit machine, original struct inode size is 176, reduced to 152
    bytes with the change.
    Tested by:	pho (previous version)
    Reviewed by:	mckusick
    Sponsored by:	The FreeBSD Foundation
    MFC after:	2 weeks