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  • Hugh Dickins's avatar
    [PATCH] shmem: restore superblock info · 0edd73b3
    Hugh Dickins authored
    To improve shmem scalability, we allowed tmpfs instances which don't need
    their blocks or inodes limited not to count them, and not to allocate any
    sbinfo.  Which was okay when the only use for the sbinfo was accounting
    blocks and inodes; but since then a couple of unrelated projects extending
    tmpfs want to store other data in the sbinfo.  Whether either extension
    reaches mainline is beside the point: I'm guilty of a bad design decision,
    and should restore sbinfo to make any such future extensions easier.
    So, once again allocate a shmem_sb_info for every shmem/tmpfs instance, and
    now let max_blocks 0 indicate unlimited blocks, and max_inodes 0 unlimited
    inodes.  Brent Casavant verified (many months ago) that this does not
    perceptibly impact the scalability (since the unlimited sbinfo cacheline is
    repeatedly accessed but only once dirtied).
    And merge shmem_set_size into its sole caller shmem_remount_fs.
    Signed-off-by: default avatarHugh Dickins <>
    Signed-off-by: default avatarAndrew Morton <>
    Signed-off-by: default avatarLinus Torvalds <>