path: root/include/target/target_core_backend.h
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authorNicholas Bellinger <nab@linux-iscsi.org>2013-02-19 17:30:34 -0800
committerNicholas Bellinger <nab@linux-iscsi.org>2013-02-20 12:29:04 -0800
commit7b745c84a9f4ad62db4b67053fbceb5d706451af (patch)
tree2c8886e676130abfa4682531eb5c01d57feb6e47 /include/target/target_core_backend.h
parent6e5459353de4ac80924e94fafa8b3e31a086c5dd (diff)
target/file: Add WRITE_SAME w/ UNMAP=0 emulation support
This patch adds support for emulation of WRITE_SAME w/ UNMAP=0 within fd_execute_write_same() backend code. The emulation uses vfs_writev() to submit a locally populated buffer from the received WRITE_SAME scatterlist block for duplication, and by default enforces a limit of max_write_same_len=0x1000 (8192) sectors up to the limit of 1024 iovec entries for the single call to vfs_writev(). It also sets max_write_same_len to the operational default at setup -> fd_configure_device() time. Tested with 512, 1k, 2k, and 4k block_sizes. (asias: convert to vzalloc) Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Asias He <asias@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include/target/target_core_backend.h')
0 files changed, 0 insertions, 0 deletions