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* iscsi-target: Fix iscsit_sequence_cmd reject handling for iserNicholas Bellinger2013-08-04
| | | | | | | | | | | | | | | | | | | | commit 561bf15892375597ee59d473a704a3e634c4f311 upstream This patch moves ISCSI_OP_REJECT failures into iscsit_sequence_cmd() in order to avoid external iscsit_reject_cmd() reject usage for all PDU types. It also updates PDU specific handlers for traditional iscsi-target code to not reset the session after posting a ISCSI_OP_REJECT during setup. (v2: Fix CMDSN_LOWER_THAN_EXP for ISCSI_OP_SCSI to call target_put_sess_cmd() after iscsit_sequence_cmd() failure) Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Cc: Or Gerlitz <ogerlitz@mellanox.com> Cc: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* iscsi-target: Fix iscsit_add_reject* usage for iserNicholas Bellinger2013-08-04
| | | | | | | | | | | | | | | | | | | | | | | commit ba159914086f06532079fc15141f46ffe7e04a41 upstream This patch changes iscsit_add_reject() + iscsit_add_reject_from_cmd() usage to not sleep on iscsi_cmd->reject_comp to address a free-after-use usage bug in v3.10 with iser-target code. It saves ->reject_reason for use within iscsit_build_reject() so the correct value for both transport cases. It also drops the legacy fail_conn parameter usage throughput iscsi-target code and adds two iscsit_add_reject_cmd() and iscsit_reject_cmd helper functions, along with various small cleanups. (v2: Re-enable target_put_sess_cmd() to be called from iscsit_add_reject_from_cmd() for rejects invoked after target_get_sess_cmd() has been called) Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Cc: Or Gerlitz <ogerlitz@mellanox.com> Cc: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* iser-target: Fix session reset bug with RDMA_CM_EVENT_DISCONNECTEDNicholas Bellinger2013-08-04
| | | | | | | | | | | | | | | | | | | | | | | | commit b2cb96494d83b894a43ba8b9023eead8ff50684b upstream. This patch addresses a bug where RDMA_CM_EVENT_DISCONNECTED may occur before the connection shutdown has been completed by rx/tx threads, that causes isert_free_conn() to wait indefinately on ->conn_wait. This patch allows isert_disconnect_work code to invoke rdma_disconnect when isert_disconnect_work() process context is started by client session reset before isert_free_conn() code has been reached. It also adds isert_conn->conn_mutex protection for ->state within isert_disconnect_work(), isert_cq_comp_err() and isert_free_conn() code, along with isert_check_state() for wait_event usage. (v2: Add explicit iscsit_cause_connection_reinstatement call during isert_disconnect_work() to force conn reset) Cc: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* target: Propigate up ->cmd_kref put return via transport_generic_free_cmdNicholas Bellinger2013-05-31
| | | | | | | | | | | | Go ahead and propigate up the ->cmd_kref put return value from target_put_sess_cmd() -> transport_release_cmd() -> transport_put_cmd() -> transport_generic_free_cmd(). This is useful for certain fabrics when determining the active I/O shutdown case with SCF_ACK_KREF where a final target_put_sess_cmd() is still required by the caller. Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Re-instate sess_wait_list for target_wait_for_sess_cmdsNicholas Bellinger2013-05-30
| | | | | | | | | | | | | | | | | | | | | | | | | Switch back to pre commit 1c7b13fe652 list splicing logic for active I/O shutdown with tcm_qla2xxx + ib_srpt fabrics. The original commit was done under the incorrect assumption that it's safe to walk se_sess->sess_cmd_list unprotected in target_wait_for_sess_cmds() after sess->sess_tearing_down = 1 has been set by target_sess_cmd_list_set_waiting() during session shutdown. So instead of adding sess->sess_cmd_lock protection around sess->sess_cmd_list during target_wait_for_sess_cmds(), switch back to sess->sess_wait_list to allow wait_for_completion() + TFO->release_cmd() to occur without having to walk ->sess_cmd_list after the list_splice. Also add a check to exit if target_sess_cmd_list_set_waiting() has already been called, and add a WARN_ON to check for any fabric bug where new se_cmds are added to sess->sess_cmd_list after sess->sess_tearing_down = 1 has already been set. Cc: Joern Engel <joern@logfs.org> Cc: Roland Dreier <roland@kernel.org> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove unused wait_for_tasks bit in target_wait_for_sess_cmdsJoern Engel2013-05-21
| | | | | | | | | Drop unused transport_wait_for_tasks() check in target_wait_for_sess_cmds shutdown code, and convert tcm_qla2xxx + ib_srpt fabric drivers. Cc: Joern Engel <joern@logfs.org> Cc: Roland Dreier <roland@kernel.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: removed unused transport_state flagJoern Engel2013-05-15
| | | | | Signed-off-by: Joern Engel <joern@logfs.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove unused struct members in se_dev_entryAndy Grover2013-05-03
| | | | | | | Some were incremented, but never used anywhere from what I could tell. Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* iscsi-target: Add iscsit_transport API templateNicholas Bellinger2013-04-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Add basic struct iscsit_transport API template to allow iscsi-target for running with external transport modules using existing iscsi_target_core.h code. For all external modules, this calls try_module_get() and module_put() to obtain + release an external iscsit_transport module reference count. Also include the iscsi-target symbols necessary in iscsi_transport.h to allow external transport modules to function. v3 changes: - Add iscsit_build_reject export for ISTATE_SEND_REJECT usage v2 changes: - Drop unnecessary export of iscsit_get_transport + iscsit_put_transport (roland) - Add ->iscsit_queue_data_in() to remove extra context switch on RDMA_WRITE - Add ->iscsit_queue_status() to remove extra context switch on IB_SEND status - Add ->iscsit_get_dataout() to remove extra context switch on RDMA_READ - Drop ->iscsit_free_cmd() - Drop ->iscsit_unmap_cmd() - Rename iscsit_create_transport() -> iscsit_register_transport() (andy) - Rename iscsit_destroy_transport() -> iscsit_unregister_transport() (andy) Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add export of target_get_sess_cmd symbolNicholas Bellinger2013-04-25
| | | | | | | Export target_get_sess_cmd() symbol so that it can be used by iscsi-target. Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add sbc_execute_unmap() helperAsias He2013-04-25
| | | | | | | | | | | | iblock_execute_unmap() and fd_execute_unmap share a lot of code. Add sbc_execute_unmap() helper to remove duplicated code for iblock_execute_unmap() and fd_execute_unmap(). Cc: Christoph Hellwig <hch@lst.de> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Asias He <asias@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Rename spc_get_write_same_sectors -> sbc_get_write_same_sectorsRoland Dreier2013-02-23
| | | | | | | | | Trivial, but WRITE SAME is an SBC command so it seems strange for a related function (defined in target_core_sbc.c) to be in the spc_ namespace. Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Fix error checking for UNMAP commandsRoland Dreier2013-02-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | SBC-3 (revision 35) says: The PARAMETER LIST LENGTH field specifies the length in bytes of the UNMAP parameter list that is available to be transferred from the Data-Out Buffer. If the parameter list length is greater than zero and less than 0008h (i.e., eight), then the device server shall terminate the command with CHECK CONDITION status with the sense key set to ILLEGAL REQUEST and the additional sense code set to PARAMETER LIST LENGTH ERROR. A PARAMETER LIST LENGTH set to zero specifies that no data shall be sent. so our sense code for too-short descriptors was wrong, and we were incorrectly failing commands that didn't transfer any descriptors. While we're at it, also handle the UNMAP check: If the ANCHOR bit is set to one, and the ANC_SUP bit in the Logical Block Provisioning VPD page (see 6.6.4) is set to zero, then the device server shall terminate the command with CHECK CONDITION status with the sense key set to ILLEGAL REQUEST and the additional sense code set to INVALID FIELD IN CDB. (chris boot: Fix wrong cut+paste comment in transport_send_check_condition_and_sense) Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add device attribute to expose config_item_name for INQUIRY modelTregaron Bayly2013-02-13
| | | | | | | | | This patch changes LIO to use the configfs backend device name as the model if you echo '1' to an individual device's emulate_model_alias attribute. This is a valid operation only on devices with an export count of 0. Signed-off-by: Tregaron Bayly <tbayly@bluehost.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target/iblock: Use backend REQ_FLUSH hint for WriteCacheEnabled statusNicholas Bellinger2013-02-13
| | | | | | | | | | | | | | | | | | | | | | | | | This patch allows IBLOCK to check block hints in request_queue->flush_flags when reporting current backend device WriteCacheEnabled status to a remote SCSI initiator port. This is done via a se_subsystem_api->get_write_cache() call instead of a backend se_device creation time flag, as we expect REQ_FLUSH bits to possibly change from an underlying blk_queue_flush() by the SCSI disk driver, or internal raw struct block_device driver usage. Also go ahead and update iblock_execute_rw() bio I/O path code to use REQ_FLUSH + REQ_FUA hints when determining WRITE_FUA usage, and make SPC emulation code use a spc_check_dev_wce() helper to handle both types of cases for virtual backend subsystem drivers. (asias: Drop unnecessary comparsion operators) Reported-by: majianpeng <majianpeng@gmail.com> Cc: majianpeng <majianpeng@gmail.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: James Bottomley <JBottomley@Parallels.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: change sprintf to snprintf in transport_dump_vpd_identDan Carpenter2013-02-13
| | | | | | | | | | "buf" is 128 characters and "vpd->device_identifier" is 256. It makes the static checkers complain. Also bump VPD_TMP_BUF_SIZE to match INQUIRY_VPD_DEVICE_IDENTIFIER_LEN. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove never-used TMR_FABRIC_TMR enum valueRoland Dreier2013-02-13
| | | | | Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Export SPC inquiry emulationHannes Reinecke2013-02-13
| | | | | | | | | | Some target drivers might need to access the inquiry data directly, without sending out the actual command. So export these functions. Signed-off-by: Hannes Reinecke <hare@suse.de> Cc: Nicholas Bellinger <nab@risingtidesystems.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Introduce TCM_NO_SENSEHannes Reinecke2013-01-10
| | | | | | | | | Introduce TCM_NO_SENSE, mapping to sense code 'Not ready, no additional sense information'. Signed-off-by: Hannes Reinecke <hare@suse.de> Cc: Nicholas Bellinger <nab@risingtidesystems.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target/iscsi_target: Add NodeACL tags for initiator group supportAndy Grover2012-12-13
| | | | | | | | | | | | | | | | | | | | | | | | Thanks for reviews, looking a lot better. ---- 8< ---- Initiator access config could be easier. The way other storage vendors have addressed this is to support initiator groups: the admin adds initiator WWNs to the group, and then LUN permissions can be granted for the entire group at once. Instead of changing ktarget's configfs interface, this patch keeps the configfs interface per-initiator-wwn and just adds a 'tag' field for each. This should be enough for user tools like targetcli to group initiator ACLs and sync their configurations. acl_tag is not used internally, but needs to be kept in configfs so that all user tools can avoid dependencies on each other. Code tested to work, although userspace pieces still to be implemented. Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add link_magic for fabric allow_link destination target_itemsNicholas Bellinger2012-12-05
| | | | | | | | | | | | | This patch adds [dev,lun]_link_magic value assignment + checks within generic target_fabric_port_link() and target_fabric_mappedlun_link() code to ensure destination config_item *target_item sent from configfs_symlink() -> config_item_operations->allow_link() is the underlying se_device->dev_group and se_lun->lun_group that we expect to symlink. Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Make spc_get_write_same_sectors return sector_tNicholas Bellinger2012-11-28
| | | | | | | | | | | | We already expect TFO->get_blocks() to return sector_t for zero value case when doing WRITE_SAME to the end of the backend device, so go ahead and return sector_t from spc_get_write_same_sectors() to handle this case properly. Also, update the single iblock_execute_write_same() caller of this code. Cc: Christoph Hellwig <hch@lst.de> Cc: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add/check max_write_same_len device attribute + update block limits VPDNicholas Bellinger2012-11-15
| | | | | | | | | | | | | | | | | | | This patch adds a new max_write_same_len device attribute for use with WRITE_SAME w/ UNMAP=0 backend emulation. This can be useful for lowering the default backend value (IBLOCK uses 0xFFFF). Also, update block limits VPD emulation code in spc_emulate_evpd_b0() to report MAXIMUM WRITE SAME LENGTH, and enforce max_write_same_len during sbc_parse() -> sbc_setup_write_same() CDB sanity checking for all emulated WRITE_SAME w/ UNMAP=0 cases. (Robert: Move max_write_same_len check in sbc_setup_write_same() to check both WRITE_SAME w/ UNMAP=1 and w/ UNMAP=0 cases) Cc: Christoph Hellwig <hch@lst.de> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Robert Elliott <Elliott@hp.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target/sbc: Seperate WRITE_SAME based on UNMAP flag in sbc_opsNicholas Bellinger2012-11-15
| | | | | | | | | | | | | This patch adds a new sbc_ops->execute_write_same_unmap() caller for use with WRITE_SAME w/ UNMAP=1, and performs the ->execute_cmd() setup based this bit within sbc_setup_write_same() code. Also, makes the changes in sbc_parse_cdb() to handle a sense_reason_t return from sbc_setup_write_same() on error. Reported-by: Christoph Hellwig <hch@lst.de> Cc: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: pass sense_reason as a return valueChristoph Hellwig2012-11-06
| | | | | | | | | | | | | | | Pass the sense reason as an explicit return value from the I/O submission path instead of storing it in struct se_cmd and using negative return values. This cleans up a lot of the code pathes, and with the sparse annotations for the new sense_reason_t type allows for much better error checking. (nab: Convert spc_emulate_modesense + spc_emulate_modeselect to use sense_reason_t with Roland's MODE SELECT changes) Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove ->get_device_revChristoph Hellwig2012-11-06
| | | | | | | | | Now that the reservations and ALUA code have been cleaned up there is no need for the get_device_rev method, as we only need the standards revision in the inquiry data, where we can hardcode it. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: simplify alua supportChristoph Hellwig2012-11-06
| | | | | | | | We always support ALUA for virtual backends, and never for physical ones. Simplify the code to just deal with these two cases and remove the superflous abstractions. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: simplify reservations codeChristoph Hellwig2012-11-06
| | | | | | | | | | | | We do not support host-level reservations for the pscsi backend, and all virtual backends are newere than SCSI-2, so just make the combined SPC-3 + SCSI-2 support the only supported variant and kill the switches for the different implementations, given that this code handles the no-op version just fine. (hch: Update DRF_SPC2_RESERVATIONS lock usage) Signed-off-by: Christoph Hellwig <hch@lst.de>
* target: kill dev->dev_task_attr_typeChristoph Hellwig2012-11-06
| | | | | | | We can just key off ordered tag emulation of the transport_type field. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: provide generic sbc device type/revision helpersChristoph Hellwig2012-11-06
| | | | | Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target/pscsi: call spc_emulate_report_luns directlyChristoph Hellwig2012-11-06
| | | | | | | | | | No need to indirect through spc_parse_cdb if we only ever call it for REPORT LUNS emulation. (nab: Add missing EXPORT_SYMBOL for spc_emulate_report_luns) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: rename spc_opsChristoph Hellwig2012-11-06
| | | | | | | These really are sbc_ops, so name them correctly. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: kill struct se_subsystem_devChristoph Hellwig2012-11-06
| | | | | | | | | | Simplify the code a lot by killing the superflous struct se_subsystem_dev. Instead se_device is allocated early on by the backend driver, which allocates it as part of its own per-device structure, borrowing the scheme that is for example used for inode allocation. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add target_submit_cmd_map_sgls for SGL fabric memory passthroughNicholas Bellinger2012-10-02
| | | | | | | | | | | | | | | | | This patch adds a new target_submit_cmd_map_sgls() to pass pre-allocated SGL memory using transport_generic_map_mem_to_cmd() logic into the generic target submit I/O codepath. It also adds a target_submit_cmd() wrapper around target_submit_cmd_map_sgls() for existing fabric code that already assumes internal target-core SGL memory allocation. (v2: Rename to target_submit_cmd_map_sgls + drop TARGET_SCF_MAP_MEM flag in favor of non zero sgl_count check) Reported-by: Christoph Hellwig <hch@lst.de> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Drop se_subsystem_api->[write_cache,fua_write]_emulated flagsNicholas Bellinger2012-09-17
| | | | | | | | | | | | This patch drops se_subsystem_api->[write_cache,fua_write]_emulated flags set by viritual FILEIO/IBLOCK/RD_MCP backend drivers in favor of explict TRANSPORT_PLUGIN_PHBA_PDEV checks to know when to fail if userspace is attempting to set virtual emulation bits for an pSCSI (passthrough) backend device. Reported-by: Christoph Hellwig <hch@lst.de> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Simplify fabric sense data length handlingRoland Dreier2012-09-17
| | | | | | | | | | | | | | | | | | | | | | Every fabric driver has to supply a se_tfo->set_fabric_sense_len() method, just so iSCSI can return an offset of 2. However, every fabric driver is already allocating a sense buffer and passing it into the target core, either via transport_init_se_cmd() or target_submit_cmd(). So instead of having iSCSI pass the start of its sense buffer into the core and then later tell the core to skip the first 2 bytes, it seems easier for iSCSI just to do the offset of 2 when it passes the sense buffer into the core. Then we can drop the se_tfo->set_fabric_sense_len() everywhere, and just add a couple of lines of code to iSCSI to set the sense data length to the beginning of the buffer right before it sends it over the network. (nab: Remove .set_fabric_sense_len usage from tcm_qla2xxx_npiv_ops + change transport_get_sense_buffer to follow v3.6-rc6 code w/o ->set_fabric_sense_len usage) Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove unused target_core_fabric_ops.get_fabric_sense_len methodRoland Dreier2012-09-17
| | | | | | | | There are no callers of se_tfo->get_fabric_sense_len(), so we should stop having every fabric driver implement it. Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: support zero allocation length in REQUEST SENSEPaolo Bonzini2012-09-07
| | | | | | | | | | | | | | | | | | | | | | Similar to INQUIRY and MODE SENSE, construct the sense data in a buffer and later copy it to the scatterlist. Do not do anything, but still clear a pending unit attention condition, if the allocation length is zero. However, SPC tells us that "If a REQUEST SENSE command is terminated with CHECK CONDITION status [and] the REQUEST SENSE command was received on an I_T nexus with a pending unit attention condition (i.e., before the device server reports CHECK CONDITION status), then the device server shall not clear the pending unit attention condition." Do the transport_kmap_data_sg early to detect this case. It also tells us "Device servers shall not adjust the additional sense length to reflect truncation if the allocation length is less than the sense data available", so do not do that! Note that the err variable is write-only. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: fix use-after-free with PSCSI sense dataPaolo Bonzini2012-09-05
| | | | | | | | | | | | | | The pointer to the sense buffer is fetched by transport_get_sense_data, but this is called by target_complete_ok_work long after pscsi_req_done has freed the struct that contains it. Pass instead the fabric's sense buffer to transport_complete, and copy the data to it directly in transport_complete. Setting SCF_TRANSPORT_TASK_SENSE also becomes a duty of transport_complete. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove unused se_cmd.cmd_spdtlRoland Dreier2012-08-21
| | | | | | | | This was originally for helping fabrics to determine overflow/underflow status, and has been superceeded by SCF_OVERFLOW_BIT + SCF_UNDERFLOW_BIT. Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Allow for target_submit_cmd() returning errorsRoland Dreier2012-07-17
| | | | | | | | | | | | | | | | | | | | | | | | | | We want it to be possible for target_submit_cmd() to return errors up to its fabric module callers. For now just update the prototype to return an int, and update all callers to handle non-zero return values as an error. This is immediately useful for tcm_qla2xxx to fix a long-standing active I/O session shutdown race, but tcm_fc, usb-gadget, and sbp-target the fabric maintainers need to check + ACK that handling a target_submit_cmd() failure due to session shutdown does not introduce regressions (nab: Respin against for-next after initial NACK + update docbook comment + fix double se_cmd init in exception path for usb-gadget) Cc: Chad Dupuis <chad.dupuis@qlogic.com> Cc: Arun Easi <arun.easi@qlogic.com> Cc: Chris Boot <bootc@bootc.net> Cc: Stefan Richter <stefanr@s5r6.in-berlin.de> Cc: Mark Rustad <mark.d.rustad@intel.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Felipe Balbi <balbi@ti.com> Cc: Andy Grover <agrover@redhat.com> Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Add generation of LOGICAL BLOCK ADDRESS OUT OF RANGERoland Dreier2012-07-16
| | | | | | | | | | | Many SCSI commands are defined to return a CHECK CONDITION / ILLEGAL REQUEST with ASC set to LOGICAL BLOCK ADDRESS OUT OF RANGE if the initiator sends a command that accesses a too-big LBA. Add an enum value and case entries so that target code can return this status. Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Remove se_session.sess_wait_listRoland Dreier2012-07-16
| | | | | | | | | | | | | | | | Since we set se_session.sess_tearing_down and stop new commands from being added to se_session.sess_cmd_list before we wait for commands to finish when freeing a session, there's no need for a separate sess_wait_list -- if we let new commands be added to sess_cmd_list after setting sess_tearing_down, that would be a bug that breaks the logic of waiting in-flight commands. Also rename target_splice_sess_cmd_list() to target_sess_cmd_list_set_waiting(), since we are no longer splicing onto a separate list. Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: Un-export target_get_sess_cmd()Roland Dreier2012-07-16
| | | | | | | | | | | | There are no in-tree users of target_get_sess_cmd() outside of target_core_transport.c. Any new code should use the higher-level target_submit_cmd() interface. So let's un-export target_get_sess_cmd() and make it static to the one file where it's actually used. (nab: Fix up minor fuzz to for-next) Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: replace the processing thread with a TMR work queueChristoph Hellwig2012-07-16
| | | | | | | | | | The last functionality of the target processing thread is offloading possibly long running task management requests from the submitter context. To keep TMR semantics the same we need a single threaded ordered queue, which can be provided by a per-device workqueue with the right flags. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove transport_generic_handle_cdb_mapChristoph Hellwig2012-07-16
| | | | | | | | | Remove this command submission path which is not used by any in-tree driver. This also removes the now unused new_cmd_map fabtric method, which a few drivers implemented despite never calling transport_generic_handle_cdb_map. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove transport_generic_handle_dataChristoph Hellwig2012-07-16
| | | | | Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: remove transport_generic_process_writeChristoph Hellwig2012-07-16
| | | | | | | | Just call target_execute_cmd directly. Also, convert loopback, sbp, usb-gadget to use the newly exported target_execute_cmd(). Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: move unmap to struct spc_opsChristoph Hellwig2012-07-16
| | | | | | | | | Having all the unmap payload parsing in the backed is a bit ugly, but until more drivers support it and we can find a good interface for all of them that seems the way to go. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
* target: move write_same to struct spc_opsChristoph Hellwig2012-07-16
| | | | | | | | | | | | Add spc_ops->execute_write_same() caller for ->execute_cmd() setup, and update IBLOCK backends to use it. (nab: add export of spc_get_write_same_sectors symbol) (roland: Carry forward: Fix range calculation in WRITE SAME emulation when num blocks == 0) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-29 13:30:02 -0500