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target: Fail WRITE_SAME w/ UNMAP=1 when emulate_tpws=0

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This patch adds a check within sbc_setup_write_same() to fail a
WRITE_SAME w/ UNMAP=1 op, if the backend device has emulate_tpws
disabled.

Cc: Martin Petersen <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>
This commit is contained in:
Nicholas Bellinger 2015-02-14 01:56:19 +00:00
commit d0a9129555
1 changed files with 5 additions and 0 deletions
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5
drivers/target/target_core_sbc.c
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@ -293,6 +293,11 @@ sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *o
if (!ops->execute_write_same_unmap)
return TCM_UNSUPPORTED_SCSI_OPCODE;
if (!dev->dev_attrib.emulate_tpws) {
pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
" has emulate_tpws disabled\n");
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
cmd->execute_cmd = ops->execute_write_same_unmap;
return 0;
}