Doug / smarc-fsl-linux-kernel

10 Jun, 2009

1 commit

  • 003ff182f   nilfs2: allow future expansion of metadata read out via get info ioctl ... Browse Code »

    Nilfs has some ioctl commands to read out metadata from meta data
    files:

    - NILFS_IOCTL_GET_CPINFO for checkpoint file,
    - NILFS_IOCTL_GET_SUINFO for segment usage file, and
    - NILFS_IOCTL_GET_VINFO for Disk Address Transalation (DAT) file,
    respectively.

    Every routine on these metadata files is implemented so that it allows
    future expansion of on-disk format. But, the above ioctl commands do
    not support expansion even though nilfs_argv structure can handle
    arbitrary size for data exchanged via ioctl.

    This allows future expansion of the following structures which give
    basic format of the "get information" ioctls:

    - struct nilfs_cpinfo
    - struct nilfs_suinfo
    - struct nilfs_vinfo

    So, this introduces forward compatility of such ioctl commands.

    In this patch, a sanity check in nilfs_ioctl_get_info() function is
    changed to accept larger data structure [1], and metadata read
    routines are rewritten so that they become compatible for larger
    structures; the routines will just ignore the remaining fields which
    the current version of nilfs doesn't know.

    [1] The ioctl function already has another upper limit (PAGE_SIZE
    against a structure, which appears in nilfs_ioctl_wrap_copy
    function), and this will not cause security problem.

    Signed-off-by: Ryusuke Konishi

    Ryusuke Konishi
     

07 Apr, 2009

1 commit

  • a17564f58   nilfs2: disk address translator ... Browse Code »

    This adds the disk address translation file (DAT) whose primary function
    is to convert virtual disk block numbers to actual disk block numbers.

    The virtual block numbers of NILFS are associated with checkpoint
    generation numbers, and this file also provides functions to manage the
    lifetime information of each virtual block number.

    Signed-off-by: Koji Sato
    Signed-off-by: Ryusuke Konishi
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Koji Sato