• Nicholas Bellinger's avatar
    target: Add/check max_write_same_len device attribute + update block limits VPD · 773cbaf7
    Nicholas Bellinger authored
    This patch adds a new max_write_same_len device attribute for use with
    WRITE_SAME w/ UNMAP=0 backend emulation.  This can be useful for
    lowering the default backend value (IBLOCK uses 0xFFFF).
    
    Also, update block limits VPD emulation code in spc_emulate_evpd_b0() to
    report MAXIMUM WRITE SAME LENGTH, and enforce max_write_same_len during
    sbc_parse() -> sbc_setup_write_same() CDB sanity checking for all emulated
    WRITE_SAME w/ UNMAP=0 cases.
    
    (Robert: Move max_write_same_len check in sbc_setup_write_same() to
             check both WRITE_SAME w/ UNMAP=1 and w/ UNMAP=0 cases)
    
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Martin K. Petersen <martin.petersen@oracle.com>
    Cc: Robert Elliott <Elliott@hp.com>
    Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
    773cbaf7
target_core_sbc.c 16.3 KB