• Mike Christie's avatar
    [SCSI] seperate max_sectors from max_hw_sectors · defd94b7
    Mike Christie authored
    - export __blk_put_request and blk_execute_rq_nowait
    needed for async REQ_BLOCK_PC requests
    - seperate max_hw_sectors and max_sectors for block/scsi_ioctl.c and
    SG_IO bio.c helpers per Jens's last comments. Since block/scsi_ioctl.c SG_IO was
    already testing against max_sectors and SCSI-ml was setting max_sectors and
    max_hw_sectors to the same value this does not change any scsi SG_IO behavior. It only
    prepares ll_rw_blk.c, scsi_ioctl.c and bio.c for when SCSI-ml begins to set
    a valid max_hw_sectors for all LLDs. Today if a LLD does not set it
    SCSI-ml sets it to a safe default and some LLDs set it to a artificial low
    value to overcome memory and feedback issues.
    Note: Since we now cap max_sectors to BLK_DEF_MAX_SECTORS, which is 1024,
    drivers that used to call blk_queue_max_sectors with a large value of
    max_sectors will now see the fs requests capped to BLK_DEF_MAX_SECTORS.
    Signed-off-by: default avatarMike Christie <michaelc@cs.wisc.edu>
    Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
scsi_lib.c 57.3 KB