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2012-03-15target: Use array_zalloc for device_listJörn Engel
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>
2012-03-15target: Use array_zalloc for tpg_lun_listJörn Engel
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>
2012-03-10target: Bump core version to v4.1.0-rc2-ml + fabric versionsNicholas Bellinger
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>
2012-03-10target: Drop unused legacy target_core_fabric_ops API callersNicholas Bellinger
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>
2012-03-10target: Convert se_node_acl->acl_group removal to use ->acl_krefNicholas Bellinger
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>
2012-03-10target: Add se_node_acl->acl_kref for ->acl_free_comp usageNicholas Bellinger
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>
2012-03-10target: Add se_node_acl->acl_free_comp for NodeACL release pathNicholas Bellinger
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>
2012-03-10target: Add se_sess->sess_kref + get/put helpersNicholas Bellinger
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>
2012-02-25target: Allow target_submit_tmr interrupt context + pass ABORT_TASK tagNicholas Bellinger
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>
2012-02-25target: Fix target_submit_tmr se_tmr_req allocation failuresNicholas Bellinger
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>
2012-02-25target: Untangle front-end and back-end meanings of max_sectors attributeRoland Dreier
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>
2012-02-25target: Fix up handling of short INQUIRY buffersRoland Dreier
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>
2012-02-25target: Add SCF_ACK_KREF flag for acknowledgement krefNicholas Bellinger
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>
2012-02-25target: Export transport_generic_request_failure symbolNicholas Bellinger
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>
2012-02-25target: Add target_submit_tmr helper functionAndy Grover
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>
2012-02-25target: Add SCF_SCSI_TMR_CDB usage and drop se_tmr_req_cacheAndy Grover
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>
2012-02-25target: Remove unused struct se_queue_reqAndy Grover
Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2012-02-25target: fix comment typosAndy Grover
Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2012-02-25target: remove the transport_lun_active field in struct se_cmdChristoph Hellwig
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>
2012-02-25target: replace various cmd flags with a transport stateChristoph Hellwig
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>
2012-02-07target: Change target_submit_cmd() to return voidAndy Grover
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>
2012-01-18target: Allow control CDBs with data > 1 pageAndy Grover
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>
2011-12-16target: Set additional sense length field in sense dataRoland Dreier
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>
2011-12-14target: Remove extra se_device->execute_task_lock access in fast pathNicholas Bellinger
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>
2011-12-14target: Drop se_device TCQ queue_depth usage from I/O pathNicholas Bellinger
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>
2011-12-14target: Remove TFO->check_release_cmd() fabric API callerNicholas Bellinger
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>
2011-12-14target: Add target_submit_cmd() for process context fabric submissionNicholas Bellinger
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>
2011-12-14target: Make target_put_sess_cmd use target_release_cmd_krefNicholas Bellinger
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>
2011-12-14target: remove overagressive ____cacheline_aligned annoationsChristoph Hellwig
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>
2011-12-14target: make the se_task task_state_active a normal boolChristoph Hellwig
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>
2011-12-14target: remove the se_task task_error_status fieldChristoph Hellwig
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>
2011-12-14target: fold se_task.task_sense into task_flagsChristoph Hellwig
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-14target: header reshuffle, part2Christoph Hellwig
This reorganized the headers under include/target into: - target_core_base.h stays as is with all target-wide data stuctures and defines - target_core_backend.h contains the whole interface to I/O backends - target_core_fabric.h contains the whole interface to fabric modules Except for those only the various configfs macro headers stay around. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-14target: reshuffle headersChristoph Hellwig
Create a new headers, drivers/target/target_core_internal.h that is supposed to hold all target_core-internal prototypes. Move all non-exported includes from include/target to it, and merge the smaller prototype-only includes inside drivers/target into it as well. Mark functions that were found to not be called outside their implementation file static. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-06target: remove the unused se_dev_listChristoph Hellwig
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-06target: remove unused struct fieldsJörn Engel
Some are never used, some are set but never read, dev_hoq_count is incremented and decremented, but never read. Signed-off-by: Joern Engel <joern@logfs.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-06target: remove the unused t_task_pt_sgl and t_task_pt_sgl_num se_cmd fieldsChristoph Hellwig
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-06target: remove the t_tasks_bidi se_cmd fieldChristoph Hellwig
And use a SCF_BIDI flag instead. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-06target: remove the t_tasks_fua se_cmd fieldChristoph Hellwig
And use a SCF_FUA flag instead. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-06target: remove the se_ordered_node se_cmd fieldChristoph Hellwig
We never walk ordered_cmd_list in the se_device, so remove all code related to supporting it. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-06target: remove the se_obj_ptr and se_orig_obj_ptr se_cmd fieldsChristoph Hellwig
We already have a perfectly valid se_device pointer in the command, so remove the mostly useless duplicates. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-06target: Avoid compiler warnings about signed one-bit bitfieldsBart Van Assche
Convert to unsigned bit fields for active I/O shutdown fields. Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-06target: Address legacy PYX_TRANSPORT_* return code breakageNicholas Bellinger
This patch removes legacy usage of PYX_TRANSPORT_* return codes in a number of locations and addresses cases where transport_generic_request_failure() was returning the incorrect sense upon CHECK_CONDITION status after the v3.1 converson to use errno return codes. This includes the conversion of transport_generic_request_failure() to process cmd->scsi_sense_reason and handle extra TCM_RESERVATION_CONFLICT before calling transport_send_check_condition_and_sense() to queue up response status. It also drops PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES legacy usgae, and returns TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE w/ a response for these cases. transport_generic_allocate_tasks(), transport_generic_new_cmd(), backend SCF_SCSI_DATA_SG_IO_CDB ->do_task(), and emulated ->execute_task() have all been updated to set se_cmd->scsi_sense_reason and return errno codes universally upon failure. This includes cmd->scsi_sense_reason assignment in target_core_alua.c, target_core_pr.c and target_core_cdb.c emulation code. Finally it updates fabric modules to remove the legacy usage, and for TFO->new_cmd_map() callers forwards return values outside of fabric code. iscsi-target has also been updated to remove a handful of special cases related to the cleanup and signaling QUEUE_FULL handling w/ ft_write_pending() (v2: Drop extra SCF_SCSI_CDB_EXCEPTION check during failure from transport_generic_new_cmd, and re-add missing task->task_error_status assignment in transport_complete_task) Cc: Christoph Hellwig <hch@lst.de> Cc: stable@kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-11-06Merge branch 'for-next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: target: use ->exectute_task for all CDB emulation target: remove SCF_EMULATE_CDB_ASYNC target: refactor transport_emulate_control_cdb target: pass the se_task to the CDB emulation callback target: split core_scsi3_emulate_pr target: split core_scsi2_emulate_crh target: Add generic active I/O shutdown logic target: add back error handling in transport_complete_task target/pscsi: blk_make_request() returns an ERR_PTR() target: Remove core TRANSPORT_FREE_CMD_INTR usage target: Make TFO->check_stop_free return free status iscsi-target: Fix non-immediate TMR handling iscsi-target: Add missing CMDSN_LOWER_THAN_EXP check in iscsit_handle_scsi_cmd target: Avoid double list_del for aborted se_tmr_req target: Minor cleanups to core_tmr_drain_tmr_list target: Fix wrong se_tmr being added to drain_tmr_list target: Fix incorrect se_cmd assignment in core_tmr_drain_tmr_list target: Check -ENOMEM to signal QUEUE_FULL from fabric callbacks tcm_loop: Add explict read buffer memset for SCF_SCSI_CONTROL_SG_IO_CDB target: Fix compile warning w/ missing module.h include
2011-11-04target: remove SCF_EMULATE_CDB_ASYNCChristoph Hellwig
All ->execute_task instances now need to complete the I/O explicitly, which can either happen synchronously or asynchronously. Note that a lot of the CDB emulations appear to return success even if some lowlevel operations failed. Given that this is an existing issue this patch doesn't change that fact. (nab: Adding missing switch breaks in PR-IN + PR_OUT) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-11-04target: pass the se_task to the CDB emulation callbackChristoph Hellwig
We want to be able to handle all CDBs through it and remove hacks like always using the first task in a CDB in target_report_luns. Also rename the callback to ->execute_task to better describe its use. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-11-04target: Add generic active I/O shutdown logicNicholas Bellinger
This patch adds the initial pieces of generic active I/O shutdown logic. This is intended to be a 'opt-in' feature for fabric modules that includes the following functions to provide a mechinism for fabric modules to track se_cmd via se_session->sess_cmd_list: *) target_get_sess_cmd() - Add se_cmd to sess->sess_cmd_list, called from fabric module incoming I/O path. *) target_put_sess_cmd() - Check for completion or drop se_cmd from ->sess_cmd_list *) target_splice_sess_cmd_list() - Splice active I/O list from ->sess_cmd_list to ->sess_wait_list, can called with HW fabric lock held. *) target_wait_for_sess_cmds() - Walk ->sess_wait_list waiting on individual ->cmd_wait_comp. Optional transport_wait_for_tasks() call. target_splice_sess_cmd_list() is allowed to be called under HW fabric lock, and performs the splice into se_sess->sess_wait_list and set se_cmd->cmd_wait_set. Then target_wait_for_sess_cmds() walks the list waiting for individual target_put_sess_cmd() fabric callbacks to complete. It also adds TFO->check_release_cmd() to split the completion and memory release calls, where a fabric module uses target_put_sess_cmd() to check for I/O completion during session shutdown. This is currently pushed out into fabric modules as current fabric code may sleep here waiting for TFO->check_stop_free() to complete in main response path, and because target_wait_for_sess_cmds() calling TFO->release_cmd() to free fabric descriptor memory directly. Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
2011-11-02target: Remove core TRANSPORT_FREE_CMD_INTR usageNicholas Bellinger
This patch drops TRANSPORT_FREE_CMD_INTR usage from target core, which includes the removal of transport_generic_free_cmd_intr() symbol, TRANSPORT_FREE_CMD_INTR usage in transport_processing_thread(), and special case LUN_RESET handling to skip TRANSPORT_FREE_CMD_INTR processing in core_tmr_drain_cmd_list(). We now expect that fabric modules will use an internal workqueue to provide process context when releasing se_cmd descriptor resources via transport_generic_free_cmd(). Reported-by: Christoph Hellwig <hch@lst.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Cc: Madhuranath Iyengar <mni@risingtidesystems.com> Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>
2011-11-02target: Make TFO->check_stop_free return free statusNicholas Bellinger
This patch converts target_core_fabric_ops->check_stop_free() usage in transport_cmd_check_stop() and associated fabric module usage to return '1' when the passed se_cmd has been released directly within ->check_stop_free(), or return '0' when the passed se_cmd has not been released. This addresses an issue where transport_cmd_finish_abort() -> transport_cmd_check_stop_to_fabric() was leaking descriptors during LUN_RESET for modules using ->check_stop_free(), but not directly releasing se_cmd in all cases. Cc: stable@kernel.org Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>
2011-10-25Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (59 commits) MAINTAINERS: linux-m32r is moderated for non-subscribers linux@lists.openrisc.net is moderated for non-subscribers Drop default from "DM365 codec select" choice parisc: Kconfig: cleanup Kernel page size default Kconfig: remove redundant CONFIG_ prefix on two symbols cris: remove arch/cris/arch-v32/lib/nand_init.S microblaze: add missing CONFIG_ prefixes h8300: drop puzzling Kconfig dependencies MAINTAINERS: microblaze-uclinux@itee.uq.edu.au is moderated for non-subscribers tty: drop superfluous dependency in Kconfig ARM: mxc: fix Kconfig typo 'i.MX51' Fix file references in Kconfig files aic7xxx: fix Kconfig references to READMEs Fix file references in drivers/ide/ thinkpad_acpi: Fix printk typo 'bluestooth' bcmring: drop commented out line in Kconfig btmrvl_sdio: fix typo 'btmrvl_sdio_sd6888' doc: raw1394: Trivial typo fix CIFS: Don't free volume_info->UNC until we are entirely done with it. treewide: Correct spelling of successfully in comments ...
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