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* target: Add TFO->put_session() caller for HW fabric session shutdownJoern Engel2012-06-121-0/+1
| | | | | | | | | | | | | This patch adds an optional target_core_fabric_ops->put_session() caller within the existing target_put_session() code path. This is required by tcm_qla2xxx code in order to invoke it's own fabric specific session shutdown handler using se_session->sess_kref. Signed-off-by: Joern Engel <joern@logfs.org> Cc: Roland Dreier <roland@purestorage.com> Cc: Arun Easi <arun.easi@qlogic.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add MI_REPORT_TARGET_PGS ext. header + implict_trans_secs attributeNicholas Bellinger2012-05-171-0/+1
| | | | | | | | | | | | | | | | | | | | | | | This patch adds support for ALUA MI_REPORT_TARGET_PGS extended header format defined within SPC-4. It changes target core ALUA emulation logic within target_emulate_report_target_port_groups() to support both the extended and original length only header formats. It includes adding a new 'implict_trans_secs' attribute for each ALUA target port group to control the value returned to the application client for an recommended implict translation timeout in seconds. By default this value is currently set to zero, and limited up to 255 by virtue of using a single byte in the extended header format. This value is used by target_emulate_report_target_port_groups() within the extended header logic to set IMPLICIT TRANSITION TIME as defined by spc4r30. Cc: Hannes Reinecke <hare@suse.de> Cc: Rob Evers <revers@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: make target_put_session voidJörn Engel2012-05-111-1/+1
| | | | | | | No real change, it effectively already was. Signed-off-by: Joern Engel <joern@logfs.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove max_sectors device attribute for modern se_task less codeNicholas Bellinger2012-05-091-1/+0
| | | | | | | | | | | | | | | | | | | | | This patch removes the original usage of dev_attr->max_sectors in favor of dev_attr->hw_max_sectors that is now being enforced by target core from within transport_generic_cmd_sequencer() for SCF_SCSI_DATA_SG_IO_CDB ops. After the recent se_task removal patches from hch, this value for IBLOCK backends being set via configfs by userspace from an saved max_sectors value that is turning out to be problematic, so it makes sense to go ahead and remove this now legacy attribute all-together. This patch also continues to make se_dev_set_default_attribs() do (sectors / block_size) alignment for what actually get used by target_core_mod to be safe here, following the same alignment currently used by fabric_max_sectors. Reported-by: Andy Grover <agrover@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove the t_se_count field in struct se_cmdChristoph Hellwig2012-05-061-1/+0
| | | | | | | | Now that tasks are gone we are guaranteed to only get a single completion per command, and thus don't need this counter. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove the t_task_cdbs_ex_left field in struct se_cmdChristoph Hellwig2012-05-061-1/+0
| | | | | | | | Now that tasks are gone we are guaranteed to only get a single completion per command, and thus don't need this counter. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove the t_task_cdbs_left field in struct se_cmdChristoph Hellwig2012-05-061-1/+0
| | | | | | | | Now that tasks are gone we are guaranteed to only get a single completion per command, and thus don't need this counter. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove struct se_taskChristoph Hellwig2012-05-062-16/+6
| | | | | | | | | We can use struct se_cmd for everything it did. Make sure to pass the S/G list and data direction to the execution function to ease adding back BIDI support later on. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: move the state and execute lists to the commandChristoph Hellwig2012-05-061-15/+11
| | | | | Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: simplify command to task linkageChristoph Hellwig2012-05-061-6/+1
| | | | | | | | Now that we only have a single task per command we can use a direct pointer to it instead of list. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: replace ->execute_task with ->execute_cmdChristoph Hellwig2012-05-062-2/+3
| | | | | | | | Make CDB emulation work on commands instead of tasks again as a preparation of removing tasks completely. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove the task_sectors field in struct se_taskChristoph Hellwig2012-05-061-1/+0
| | | | | | | Remove the task_sectors field that isn't used anywhere. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove the task_size field in struct se_taskChristoph Hellwig2012-05-061-1/+0
| | | | | | | | | | Now that we don't split commands the size field in the task is always equivalent to the one in the CDB, even in cases where we have two tasks due to a BIDI transfer. Just refer the the size in the command instead of duplicating it in the task. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove the task_lba field in struct se_taskChristoph Hellwig2012-05-061-1/+0
| | | | | | | | | | Now that we don't split commands the lba field in the task is always equivalent to the one in the CDB, even in cases where we have two tasks due to a BIDI transfer. Just refer the the lba in the command instead of duplicating it in the task. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove target_get_task_cdbChristoph Hellwig2012-05-061-2/+0
| | | | | | | | | | Now that tasks are always the same size as the command there is no need to rewrite a CDB in common code. Notw that we keep the separately allocated CDB in the pscsi and stgt backends for now, to easy reintroducing any command splitting local to these backends if nessecary. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Rename target_allocate_tasks to target_setup_cmd_from_cdbAndy Grover2012-04-141-1/+1
| | | | | | | | | | | This patch renames a horribly misnamed function that no longer allocate tasks to something more descriptive for it's modern use in target core. (nab: Fix up ib_srpt to use this as well ahead of a target_submit_cmd conversion) Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove transport_do_task_sg_chain() and associated detritusRoland Dreier2012-04-142-9/+0
| | | | | | | | | | | | | Now that all fabrics are converted over to using se_cmd->t_data_sg directly, we can drop the task sg chaining support. With the modern memory allocation in target core, task sg chaining is needless overhead -- we would split up the main cmd sglist into pieces, and then splice those pieces back together instead of just using the original list directly. Signed-off-by: Roland Dreier <roland@purestorage.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: add unknown size flag to target_submit_cmd()Sebastian Andrzej Siewior2012-04-141-0/+2
| | | | | | | | | | | The UASP protocol does not inform the target device upfront how much data it should expect so we have to learn in from the CDB. So in order to handle this case, add a TARGET_SCF_UNKNOWN_SIZE to target_submit_cmd() and perform an explictly assignment for se_cmd->data_length from the extracted CDB size in transport_generic_cmd_sequencer(). Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove obsolete DF_READ_ONLY usageNicholas Bellinger2012-04-141-3/+2
| | | | | | | | | | | | | This was used at one time as a hack by FILEIO backend registration to allow a struct block_device that was claimed with blkdev_get (by a local filesystem mount for example) to be exported as read-only (SCSI WP=1). Since FILEIO backend registration will no longer attempt to obtain exclusive access to an underlying struct block_device here, this flag is now obsolete. Reported-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Use array_zalloc for device_listJörn Engel2012-03-151-1/+1
| | | | | | | | | | | | | Turns an order-8 allocation into slab-sized ones, thereby preventing allocation failures with memory fragmentation. This likely saves memory as well, as the slab allocator can pack objects more tightly than the buddy allocator. (nab: Fix lio-core patch fuzz) Signed-off-by: Joern Engel <joern@logfs.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Use array_zalloc for tpg_lun_listJörn Engel2012-03-152-1/+3
| | | | | | | | | | | Turns an order-10 allocation into slab-sized ones, thereby preventing allocation failures with memory fragmentation. This likely saves memory as well, as the slab allocator can pack objects more tightly than the buddy allocator. Signed-off-by: Joern Engel <joern@logfs.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Bump core version to v4.1.0-rc2-ml + fabric versionsNicholas Bellinger2012-03-101-1/+1
| | | | | | | | | | | Bump core version to v4.1.0-rc2-ml, and for versions from the following mainline fabric modules: loopback: v2.1-rc2 tcm_fc: v0.4 iscsi-target: v4.1.0-rc2 Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Drop unused legacy target_core_fabric_ops API callersNicholas Bellinger2012-03-101-4/+0
| | | | | | | | | | | | | | This patch drops the following unused legacy API callers from target_core_fabric.h: *) TFO->fall_back_to_erl0() *) TFO->stop_session() *) TFO->sess_logged_in() *) TFO->is_state_remove() This patch also removes the stub usage in loopback, tcm_fc, iscsi_target, and ib_srpt fabric modules. Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Convert se_node_acl->acl_group removal to use ->acl_krefNicholas Bellinger2012-03-101-0/+1
| | | | | | | | | | | | | | | | | | This patch converts core_tpg_del_initiator_node_acl() shutdown from configfs context to use se_node_acl->acl_kref and ->acl_free_comp in order to wait for outstanding fabric callbacks to complete via transport_deregister_session() callbacks before waking ->acl_free_comp from the last ->acl_kref put. It also changes core_tpg_del_initiator_node_acl() to setup a local sess_list with target_get_session() + acl->acl_stop = 1 for active sessions that will be shutdown, and changes transport_deregister_session_configfs() to check for ->acl_stop usage. Cc: Roland Dreier <roland@purestorage.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Joern Engel <joern@logfs.org> Cc: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add se_node_acl->acl_kref for ->acl_free_comp usageNicholas Bellinger2012-03-102-0/+2
| | | | | | | | | | | | | | | | | This patch adds se_node_acl->acl_kref for use with ->acl_free_comp during explict se_node_acl release. It adds kref_init() during se_node_acl setup, kref_get() during __transport_register_session() -> target_put_nacl() with existing transport_deregister_session() fabric callback usage. It also moves transport_free_session() to release *se_sess memory after target_put_nacl() execution in transport_deregister_session() Cc: Roland Dreier <roland@purestorage.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Joern Engel <joern@logfs.org> Cc: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add se_node_acl->acl_free_comp for NodeACL release pathNicholas Bellinger2012-03-101-0/+1
| | | | | | | | | | | | | | | | Add se_node_acl->acl_free_comp for NodeACL release path to wait for outstanding fabric session shutdown to complete in transport_deregister_session() before finishing NodeACL release from configfs process context. Also make transport_deregister_session() clear the comp_nacl bit to skip se_node_acl->acl_free_comp completion for dynamically generated NodeACL during fabric session shutdown. Cc: Roland Dreier <roland@purestorage.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Joern Engel <joern@logfs.org> Cc: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add se_sess->sess_kref + get/put helpersNicholas Bellinger2012-03-102-0/+3
| | | | | | | | | | | | | This patch adds basic se_session->sess_kref and get/put helpers for fabric session reference counting. It sets the initial kref in transport_init_session() and adds a target_release_session() callback to invoke TFO->close_session() for final session shutdown. Cc: Roland Dreier <roland@purestorage.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Joern Engel <joern@logfs.org> Cc: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Allow target_submit_tmr interrupt context + pass ABORT_TASK tagNicholas Bellinger2012-02-251-1/+2
| | | | | | | | | | | | | | This patch allows target_submit_tmr() to pass gfp_t for se_cmd->se_tmr_req allocation, and also set up se_cmd->se_tmr_req->ref_task_tag for passed tag with TMR_ABORT_TASK. Also update tcm_fc(fcoe) parameter usgae and add ref_task_tag FIXME for TMR_ABORT_TASK usage, Cc: Andy Grover <agrover@redhat.com> Cc: Kiran Patil <kiran.patil@intel.com> Cc: Arun Easi <arun.easi@qlogic.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Fix target_submit_tmr se_tmr_req allocation failuresNicholas Bellinger2012-02-251-1/+1
| | | | | | | | | | | This patch makes target_submit_tmr() se_tmr_req allocation occur before target_get_sess_cmd(), and changes target_submit_tmr() to return a failure w/ non zero status to the fabric caller upon core_tmr_alloc_req() failure. Cc: Andy Grover <agrover@redhat.com> Cc: Kiran Patil <kiran.patil@intel.com> Cc: Arun Easi <arun.easi@qlogic.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Untangle front-end and back-end meanings of max_sectors attributeRoland Dreier2012-02-251-0/+3
| | | | | | | | | | | | | | | | | se_dev_attrib.max_sectors currently has two independent meanings: - It is reported in the block limits VPD page as the maximum transfer length, ie the largest IO that the front-end (fabric) can handle. Also the target core doesn't enforce this maximum transfer length. - It is used to hold the size of the largest IO that the back-end can handle, so we know when to split SCSI commands into multiple tasks. Fix this by adding a new se_dev_attrib.fabric_max_sectors to hold the maximum transfer length, and checking incoming IOs against that limit. Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Fix up handling of short INQUIRY buffersRoland Dreier2012-02-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | If the initiator sends us an INQUIRY command with an allocation length that's shorter than what we want to return, we're simply supposed to truncate our response and return what the initiator gave us space for, without signaling any error. Current target code has various tests that don't fill out the full response if the buffer is too short and sometimes return errors incorrectly. Fix this up by allocating a bounce buffer for INQUIRY responses if we need to, ie if we have cmd->data_length too small as well as SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC set in cmd->se_cmd_flags -- for most fabrics, we always allocate at least a full page, but for tcm_loop we may have a small buffer coming directly from the SCSI stack. This lets us delete a lot of cmd->data_length checking, and also makes our INQUIRY handling correct per SPC in a lot more cases. Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add SCF_ACK_KREF flag for acknowledgement krefNicholas Bellinger2012-02-251-1/+2
| | | | | | | | | | | When TARGET_SCF_ACK_KREF is in use with target_submit_cmd() for setting the extra acknowledgement reference to se_cmd->cmd_kref, go ahead and set SCF_ACK_KREF in order to be used later by abort task. Reported-by: Roland Dreier <roland@purestorage.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Export transport_generic_request_failure symbolNicholas Bellinger2012-02-251-0/+1
| | | | | | | | | | | | | | transport_generic_request_failure() is a wrapper around calling transport_send_check_condition_and_sense() that is required once an se_cmd->cmd_kref has been obtained via target_submit_cmd() -> target_get_sess_cmd(). tcm_qla2xxx currently requires this, and since it's necessary for other callers using target_submit_cmd() make it exportable now. Reported-by: Roland Dreier <roland@purestorage.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add target_submit_tmr helper functionAndy Grover2012-02-251-0/+3
| | | | | | | | | | | Similar to target_submit_cmd, this function lets fabrics call one function (albeit with a lot of parameters) instead of 3 or more. (nab: Add missing return for transport_lookup_tmr_lun failure) Signed-off-by: Andy Grover <agrover@redhat.com> Cc: Kiran Patil <kiran.patil@intel.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add SCF_SCSI_TMR_CDB usage and drop se_tmr_req_cacheAndy Grover2012-02-252-20/+21
| | | | | | | | | | | | Change the test for if a cmd is a tmr request to checking if SCF_SCSI_TMR_CDB (a new flag) is set in cmd->se_cmd_flags. Also remove se_tmr_req_cache usage in favor of kzalloc usage, and make core_tmr_alloc_req() return int + setup se_cmd->se_tmr_req directly and fix up various fabric module usages Cc: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove unused struct se_queue_reqAndy Grover2012-02-251-6/+0
| | | | | Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: fix comment typosAndy Grover2012-02-251-2/+2
| | | | | Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove the transport_lun_active field in struct se_cmdChristoph Hellwig2012-02-251-1/+0
| | | | | | | | | There is no reason to have a flag telling if a command is on the per-lun list, we can simply do a list_empty check before removing it as long as we're careful to always use list_del_init. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: replace various cmd flags with a transport stateChristoph Hellwig2012-02-251-10/+11
| | | | | | | | | | | | | | Replace various atomic_ts used as flags in struct se_cmd with a single transport_state bitmap that requires t_state_lock to be held for modifications. In the target core that assumption generally is true, but some recently added code in the SRP target had to grow new lock calls. I can't say I like the way how it messes with the command state directly, but let's leave that for later. (Re-add missing ib_srpt.c changes that nab dropped..) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Change target_submit_cmd() to return voidAndy Grover2012-02-071-1/+1
| | | | | | | | | | | | | | | | Retval not very useful, and may even be harmful. Once submitted, fabrics should expect a sense error if anything goes wrong. All fabrics checking of this retval are useless or broken: fc checks it just to emit more debug output. ib_srpt trickles retval up, then it is ignored. qla2xxx trickles it up, which then causes a bug because the abort goto in qla_target.c thinks cmd hasn't been sent to target. Just returning nothing is best. Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Allow control CDBs with data > 1 pageAndy Grover2012-01-182-2/+3
| | | | | | | | | | | | We need to handle >1 page control cdbs, so extend the code to do a vmap if bigger than 1 page. It seems like kmap() is still preferable if just a page, fewer TLB shootdowns(?), so keep using that when possible. Rename function pair for their new scope. Signed-off-by: Andy Grover <agrover@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Set additional sense length field in sense dataRoland Dreier2011-12-161-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The target code was not setting the additional sense length field in the sense data it returned, which meant that at least the Linux stack ignored the ASC/ASCQ fields. For example, without this patch, on a tcm_loop device: # sg_raw -v /dev/sda 2 0 0 0 0 0 gives cdb to send: 02 00 00 00 00 00 SCSI Status: Check Condition Sense Information: Fixed format, current; Sense key: Illegal Request Raw sense data (in hex): 70 00 05 00 00 00 00 00 while after the patch we correctly get the following (which matches what a regular disk returns): cdb to send: 02 00 00 00 00 00 SCSI Status: Check Condition Sense Information: Fixed format, current; Sense key: Illegal Request Additional sense: Invalid command operation code Raw sense data (in hex): 70 00 05 00 00 00 00 0a 00 00 00 00 20 00 00 00 00 00 Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: stable@kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove extra se_device->execute_task_lock access in fast pathNicholas Bellinger2011-12-141-1/+0
| | | | | | | | | | | | | | | | | | | This patch makes __transport_execute_tasks() perform the addition of tasks to dev->execute_task_list via __transport_add_tasks_from_cmd() while holding dev->execute_task_lock during normal I/O fast path submission. It effectively removes the unnecessary re-acquire of dev->execute_task_lock during transport_execute_tasks() -> transport_add_tasks_from_cmd() ahead of calling __transport_execute_tasks() to queue tasks for the passed *se_cmd descriptor. (v2: Re-add goto check_depth usage for multi-task submission for now..) Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Cc: Joern Engel <joern@logfs.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Drop se_device TCQ queue_depth usage from I/O pathNicholas Bellinger2011-12-141-1/+0
| | | | | | | | | | | | | Historically, pSCSI devices have been the ones that required target-core to enforce a per se_device->depth_left. This patch changes target-core to no longer (by default) enforce a per se_device->depth_left or sleep in transport_tcq_window_closed() when we out of queue slots for all backend export cases. Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Cc: Joern Engel <joern@logfs.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove TFO->check_release_cmd() fabric API callerNicholas Bellinger2011-12-141-4/+0
| | | | | | | | Remove the now unused target_core_fabric_ops->check_release_cmd() as target_core handles this directly for se_cmd->cmd_kref objects now. Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add target_submit_cmd() for process context fabric submissionNicholas Bellinger2011-12-142-1/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds a target_submit_cmd() caller that can be used by fabrics to submit an uninitialized se_cmd descriptor to an struct se_session + unpacked_lun from workqueue process context. This call will invoke the following steps: - transport_init_se_cmd() to setup se_cmd specific pointers - Obtain se_cmd->cmd_kref references with target_get_sess_cmd() - set se_cmd->t_tasks_bidi - transport_lookup_cmd_lun() to setup struct se_cmd->se_lun from the passed unpacked_lun - transport_generic_allocate_tasks() to setup the passed *cdb, and - transport_handle_cdb_direct() handle READ dispatch or WRITE ready-to-transfer callback to fabric v2 changes from hch feedback: *) Add target_sc_flags_table for target_submit_cmd flags *) Rename bidi parameter to flags, add TARGET_SCF_BIDI_OP *) Convert checks to BUG_ON *) Add out_check_cond for transport_send_check_condition_and_sense usage v3 changes: *) Add TARGET_SCF_ACK_KREF for target_submit_cmd into target_get_sess_cmd to determine when the fabric caller is expecting a second kref_put() from fabric packet acknowledgement. Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Make target_put_sess_cmd use target_release_cmd_krefNicholas Bellinger2011-12-141-0/+1
| | | | | | | | | | | | | This patch moves target_put_sess_cmd() to use a se_cmd->cmd_kref callback target_release_cmd_kref when performing driver release of fabric->se_cmd descriptor memory. It sets the default cmd_kref count value to '2' within target_get_sess_cmd() setup, and currently assumes TFO->check_stop_free() usage. It drops se_tfo->check_release_cmd() usage in the main transport_release_cmd codepath. Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove overagressive ____cacheline_aligned annoationsChristoph Hellwig2011-12-141-31/+31
| | | | | | | | | If we want dynamically allocated objects to be cacheline aligned we need to tell that to the slab allocator by using the proper flags and not by liberally sprinkling annotations onto all structures. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: make the se_task task_state_active a normal boolChristoph Hellwig2011-12-141-1/+1
| | | | | | | | | | | There is no need to make task_state_active an atomic_t given that it is always set under the execute_task_lock so we can make it a simple bool. Also rename it to t_state_active to be closer to the list it guards, and make sure all checks before the list addion/removal actually happen under execute_task_lock. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove the se_task task_error_status fieldChristoph Hellwig2011-12-141-1/+0
| | | | | | | | We only reach transport_complete_task once per task, so the test and set on task_error_status is never going to have an effect. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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