linux-stable.git/include/target/target_core_base.h, branch v3.12

target/iscsi: Bump versions to v4.1.0

2013-09-11T03:23:37+00:00

Signed-off-by: Nicholas Bellinger

target: Add Third Party Copy (3PC) bit in INQUIRY response

2013-09-10T23:48:46+00:00

This patch adds the Third Party Copy (3PC) bit to signal support
for EXTENDED_COPY within standard inquiry response data.

Also add emulate_3pc device attribute in configfs (enabled by default)
to allow the exposure of this bit to be disabled, if necessary.

Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Martin Petersen 
Cc: Chris Mason 
Cc: Roland Dreier 
Cc: Zach Brown 
Cc: James Bottomley 
Cc: Nicholas Bellinger 
Signed-off-by: Nicholas Bellinger

target: Add support for EXTENDED_COPY copy offload emulation

2013-09-10T23:48:43+00:00

This patch adds support for EXTENDED_COPY emulation from SPC-3, that
enables full copy offload target support within both a single virtual
backend device, and across multiple virtual backend devices.  It also
functions independent of target fabric, and supports copy offload
across multiple target fabric ports.

This implemenation supports both EXTENDED_COPY PUSH and PULL models
of operation, so the actual CDB may be received on either source or
desination logical unit.

For Target Descriptors, it currently supports the NAA IEEE Registered
Extended designator (type 0xe4), which allows the reference of target
ports to occur independent of fabric type using EVPD 0x83 WWNs.

For Segment Descriptors, it currently supports copy from block to
block (0x02) mode.

It also honors any present SCSI reservations of the destination target
port.  Note that only Supports No List Identifier (SNLID=1) mode is
supported.

Also included is basic RECEIVE_COPY_RESULTS with service action type
OPERATING PARAMETERS (0x03) required for SNLID=1 operation.

v3 changes:
  - Fix incorrect return type in target_do_receive_copy_results()
    (Fengguang)

v2 changes:
  - Use target_alloc_sgl() instead of transport_generic_get_mem()
  - Convert debug output to use pr_debug()
  - Convert target_xcopy_parse_target_descriptors() NAA IEEN WWN
    dump to use 0x%16phN format specification
  - Drop unnecessary xcopy_pt_cmd->xpt_passthrough_wsem, and
    associated usage in xcopy_pt_write_pending() and
    target_xcopy_issue_pt_cmd()
  - Add check for unsupported EXTENDED_COPY(LID4) service action
    bits in target_do_xcopy()

Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Martin Petersen 
Cc: Chris Mason 
Cc: Roland Dreier 
Cc: Zach Brown 
Cc: James Bottomley 
Cc: Nicholas Bellinger 
Signed-off-by: Nicholas Bellinger

target: Add global device list for EXTENDED_COPY

2013-09-10T23:48:40+00:00

EXTENDED_COPY needs to be able to search a global list of devices
based on NAA WWN device identifiers, so add a simple g_device_list
protected by g_device_mutex.

Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Martin Petersen 
Cc: Chris Mason 
Cc: Roland Dreier 
Cc: Zach Brown 
Cc: James Bottomley 
Cc: Nicholas Bellinger 
Signed-off-by: Nicholas Bellinger

target: Add support for COMPARE_AND_WRITE emulation

2013-09-10T23:41:59+00:00

This patch adds support for COMPARE_AND_WRITE emulation on a per block
basis.  This logic is used as an atomic test and set primative currently
used by VMWare ESX VAAI for performing array side locking of individual
VMFS extent ownership.

This includes the COMPARE_AND_WRITE CDB parsing within sbc_parse_cdb(),
and does the majority of the work within the compare_and_write_callback()
to perform the verify instance user data comparision, and subsequent
write instance user data I/O submission upon a successfull comparision.

The synchronization is enforced by se_device->caw_sem, that is obtained
before the initial READ I/O submission in sbc_compare_and_write().  The
mutex is then released upon MISCOMPARE in compare_and_write_callback(),
or upon WRITE instance user-data completion in compare_and_write_post().

The implementation currently assumes a single logical block (NoLB=1).

v4 changes:
 - Explicitly clear cmd->transport_complete_callback for two failure
   cases in sbc_compare_and_write() in order to avoid double unlock
   of ->caw_sem in compare_and_write_callback() (Dan Carpenter)

v3 changes:
 - Convert se_device->caw_mutex to ->caw_sem

v2 changes:
 - Set SCF_COMPARE_AND_WRITE and cmd->execute_cmd() to
   sbc_compare_and_write() during setup in sbc_parse_cdb()
 - Use sbc_compare_and_write() for initial READ submission with
   DMA_FROM_DEVICE
 - Reset cmd->execute_cmd() to sbc_execute_rw() for write instance
   user-data in compare_and_write_callback()
 - Drop SCF_BIDI command flag usage
 - Set TRANSPORT_PROCESSING + transport_state flags before write
   instance submission, and convert to __target_execute_cmd()
 - Prevent sbc_get_size() from being being called twice to
   generate incorrect size in sbc_parse_cdb()
 - Enforce se_device->caw_mutex synchronization between initial
   READ I/O submission, and final WRITE I/O completion.

Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Martin Petersen 
Cc: Chris Mason 
Cc: James Bottomley 
Cc: Nicholas Bellinger 
Signed-off-by: Nicholas Bellinger

target: Add MAXIMUM COMPARE AND WRITE LENGTH in Block Limits VPD

2013-09-09T21:29:35+00:00

This patch adds the MAXIMUM COMPARE AND WRITE LENGTH bit, currently
hardcoded to a single logical block (NoLB=1) within the Block Limits
VPD in spc_emulate_evpd_b0().

Also add emulate_caw device attribute in configfs (enabled by default)
to allow the exposure of this bit to be disabled, if necessary.

Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Martin Petersen 
Cc: Chris Mason 
Cc: James Bottomley 
Cc: Nicholas Bellinger 
Signed-off-by: Nicholas Bellinger

target: Add transport_reset_sgl_orig() for COMPARE_AND_WRITE

2013-09-09T21:29:33+00:00

After COMPARE_AND_WRITE completes it's comparision, the WRITE
payload SGLs head expect to be updated to point from the verify
instance of user data, to the write instance of user data.

So for this special case, add transport_reset_sgl_orig() usage
within transport_free_pages() and add se_cmd->t_data_[sg,nents]_orig
members to save the original assignments.

Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Martin Petersen 
Cc: Chris Mason 
Cc: James Bottomley 
Cc: Nicholas Bellinger 
Signed-off-by: Nicholas Bellinger

target: Allow sbc_ops->execute_rw() to accept SGLs + data_direction

2013-09-09T21:29:28+00:00

COMPARE_AND_WRITE expects to be able to send down a DMA_FROM_DEVICE
to obtain the necessary READ payload for comparision against the
first half of the WRITE payload containing the verify user data.

Currently virtual backends expect to internally reference SGLs,
SGL nents, and data_direction, so change IBLOCK, FILEIO and RD
sbc_ops->execute_rw() to accept this values as function parameters.

Also add default sbc_execute_rw() handler for the typical case for
cmd->execute_rw() submission using cmd->t_data_sg, cmd->t_data_nents,
and cmd->data_direction).

v2 Changes:
  - Add SCF_COMPARE_AND_WRITE command flag
  - Use sbc_execute_rw() for normal cmd->execute_rw() submission
    with expected se_cmd members.

Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Martin Petersen 
Cc: Chris Mason 
Cc: James Bottomley 
Cc: Nicholas Bellinger 
Signed-off-by: Nicholas Bellinger

target: Add TCM_MISCOMPARE_VERIFY sense handling

2013-09-09T21:29:27+00:00

This patch adds TCM_MISCOMPARE_VERIFY (ASC=0x1d, ASCQ=0x00) sense
handling to transport_send_check_condition_and_sense(), which is
required for a COMPARE_AND_WRITE comparision failure.

Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Martin Petersen 
Cc: Chris Mason 
Cc: James Bottomley 
Cc: Nicholas Bellinger 
Signed-off-by: Nicholas Bellinger

target: Add return for se_cmd->transport_complete_callback

2013-09-09T21:29:26+00:00

This patch adds a sense_reason_t return to ->transport_complete_callback(),
and updates target_complete_ok_work() to invoke the call if necessary to
transport_send_check_condition_and_sense() during the failure case.

Also update xdreadwrite_callback() to use this return value.

Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Martin Petersen 
Cc: Chris Mason 
Cc: James Bottomley 
Cc: Nicholas Bellinger 
Signed-off-by: Nicholas Bellinger