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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-09-03 06:30:45 +0000 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-09-11 00:32:26 -0700 |
| commit | 4416f89b8cfcb794d040fc3b68e5fb159b7d8d02 (patch) | |
| tree | 5593bd9e42765628da157c149fae8e7c8ae77dfd /drivers/target | |
| parent | 8f9b565482c537821588444e09ff732c7d65ed6e (diff) | |
| download | lwn-4416f89b8cfcb794d040fc3b68e5fb159b7d8d02.tar.gz lwn-4416f89b8cfcb794d040fc3b68e5fb159b7d8d02.zip | |
target: Attach EXTENDED_COPY local I/O descriptors to xcopy_pt_sess
This patch is a >= v4.1 regression bug-fix where control CDB
emulation logic in commit 38b57f82 now expects a se_cmd->se_sess
pointer to exist when determining T10-PI support is to be exposed
for initiator host ports.
To address this bug, go ahead and add locally generated se_cmd
descriptors for copy-offload block-copy to it's own stand-alone
se_session nexus, while the parent EXTENDED_COPY se_cmd descriptor
remains associated with it's originating se_cmd->se_sess nexus.
Note a valid se_cmd->se_sess is also required for future support
of WRITE_INSERT and READ_STRIP software emulation when submitting
backend I/O to se_device that exposes T10-PI suport.
Reported-by: Alex Gorbachev <ag@iss-integration.com>
Tested-by: Alex Gorbachev <ag@iss-integration.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Doug Gilbert <dgilbert@interlog.com>
Cc: <stable@vger.kernel.org> # v4.1+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_xcopy.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/target/target_core_xcopy.c b/drivers/target/target_core_xcopy.c index 4515f52546f8..47fe94ee10b8 100644 --- a/drivers/target/target_core_xcopy.c +++ b/drivers/target/target_core_xcopy.c @@ -450,6 +450,8 @@ int target_xcopy_setup_pt(void) memset(&xcopy_pt_sess, 0, sizeof(struct se_session)); INIT_LIST_HEAD(&xcopy_pt_sess.sess_list); INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list); + INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list); + spin_lock_init(&xcopy_pt_sess.sess_cmd_lock); xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; @@ -644,7 +646,7 @@ static int target_xcopy_read_source( pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n", (unsigned long long)src_lba, src_sectors, length); - transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length, + transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]); xop->src_pt_cmd = xpt_cmd; @@ -704,7 +706,7 @@ static int target_xcopy_write_destination( pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n", (unsigned long long)dst_lba, dst_sectors, length); - transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length, + transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]); xop->dst_pt_cmd = xpt_cmd; |