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authorNicholas Bellinger <nab@linux-iscsi.org>2012-11-07 20:08:38 -0800
committerNicholas Bellinger <nab@linux-iscsi.org>2012-11-15 12:48:45 -0800
commitf6970ad31d42fceb38b5595cbad093a4d0bfcc43 (patch)
tree12ac358feba2529dbd5b0ab488e0fe3b353c458b /drivers/target/target_core_pr.c
parent773cbaf7460aa58c67d4dca83c3f8bca10323bbe (diff)
target/iblock: Add WRITE_SAME w/ UNMAP=0 emulation support
This patch adds support for emulation of WRITE_SAME w/ UNMAP=0 within iblock_execute_write_same() backend code. The emulation uses a bio_add_page() call for each sector, and by default enforces a limit of max_write_same_len=0xFFFF (65536) sectors following what scsi_debug reports per default for MAXIMUM WRITE SAME LENGTH. It also sets max_write_same_len to the operational default at setup -> iblock_configure_device() time. (hch: Move unmap logic into iblock_execute_write_same_unmap + add check for single sector SGLs in iblock_execute_write_same) (mkp: Update comment for 0xFFFF magic constant) (nab: drop left-over max_write_same_len check in iblock_execute_write_same) Cc: Christoph Hellwig <hch@lst.de> Cc: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_pr.c')
0 files changed, 0 insertions, 0 deletions