• Nicholas Bellinger's avatar
    target: Add MI_REPORT_TARGET_PGS ext. header + implict_trans_secs attribute · 5b9a4d72
    Nicholas Bellinger authored
    This patch adds support for ALUA MI_REPORT_TARGET_PGS extended header
    format defined within SPC-4.  It changes target core ALUA emulation logic
    within target_emulate_report_target_port_groups() to support both the
    extended and original length only header formats.
    
    It includes adding a new 'implict_trans_secs' attribute for each ALUA
    target port group to control the value returned to the application client
    for an recommended implict translation timeout in seconds.  By default
    this value is currently set to zero, and limited up to 255 by virtue of
    using a single byte in the extended header format.
    
    This value is used by target_emulate_report_target_port_groups() within
    the extended header logic to set IMPLICIT TRANSITION TIME as defined by
    spc4r30.
    
    Cc: Hannes Reinecke <hare@suse.de>
    Cc: Rob Evers <revers@redhat.com>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Roland Dreier <roland@purestorage.com>
    Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
    5b9a4d72
target_core_alua.h 5.41 KB