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| author |   Nicholas Bellinger <nab@linux-iscsi.org> | 2013-02-19 17:30:34 -0800 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-02-20 12:29:04 -0800 |
| commit | 7b745c84a9f4ad62db4b67053fbceb5d706451af (patch) | |
| tree | 2c8886e676130abfa4682531eb5c01d57feb6e47 /include/target/target_core_backend.h | |
| parent | iscsi-target: Enforce individual network portal export once per TargetName (diff) | |
| download | linux-dev-7b745c84a9f4ad62db4b67053fbceb5d706451af.tar.xz linux-dev-7b745c84a9f4ad62db4b67053fbceb5d706451af.zip | |
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