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path: root/include/target/target_core_base.h
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2016-03-06configfs: switch ->default groups to a linked listChristoph Hellwig1-3/+0
Replace the current NULL-terminated array of default groups with a linked list. This gets rid of lots of nasty code to size and/or dynamically allocate the array. While we're at it also provide a conveniant helper to remove the default groups. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Felipe Balbi <balbi@kernel.org> [drivers/usb/gadget] Acked-by: Joel Becker <jlbec@evilplan.org> Acked-by: Nicholas Bellinger <nab@linux-iscsi.org> Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
2016-02-10target/transport: add flag to indicate CPU Affinity is observedQuinn Tran1-0/+2
Signed-off-by: Quinn Tran <quinn.tran@qlogic.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Fixes: fb3269b ("qla2xxx: Add selective command queuing") Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2016-02-06target: Drop legacy se_cmd->task_stop_comp + REQUEST_STOP usageNicholas Bellinger1-4/+0
With CMD_T_FABRIC_STOP + se_cmd->cmd_wait_set usage in place, go ahead and drop left-over CMD_T_REQUEST_STOP checks in target_complete_cmd() and unused target_stop_cmd(). Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Quinn Tran <quinn.tran@qlogic.com> Cc: Himanshu Madhani <himanshu.madhani@qlogic.com> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Andy Grover <agrover@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2016-02-05target: Fix remote-port TMR ABORT + se_cmd fabric stopNicholas Bellinger1-0/+2
To address the bug where fabric driver level shutdown of se_cmd occurs at the same time when TMR CMD_T_ABORTED is happening resulting in a -1 ->cmd_kref, this patch adds a CMD_T_FABRIC_STOP bit that is used to determine when TMR + driver I_T nexus shutdown is happening concurrently. It changes target_sess_cmd_list_set_waiting() to obtain se_cmd->cmd_kref + set CMD_T_FABRIC_STOP, and drop local reference in target_wait_for_sess_cmds() and invoke extra target_put_sess_cmd() during Task Aborted Status (TAS) when necessary. Also, it adds a new target_wait_free_cmd() wrapper around transport_wait_for_tasks() for the special case within transport_generic_free_cmd() to set CMD_T_FABRIC_STOP, and is now aware of CMD_T_ABORTED + CMD_T_TAS status bits to know when an extra transport_put_cmd() during TAS is required. Note transport_generic_free_cmd() is expected to block on cmd->cmd_wait_comp in order to follow what iscsi-target expects during iscsi_conn context se_cmd shutdown. Cc: Quinn Tran <quinn.tran@qlogic.com> Cc: Himanshu Madhani <himanshu.madhani@qlogic.com> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Andy Grover <agrover@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: stable@vger.kernel.org # 3.10+ Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
2016-02-03target: Fix LUN_RESET active I/O handling for ACK_KREFNicholas Bellinger1-0/+1
This patch fixes a NULL pointer se_cmd->cmd_kref < 0 refcount bug during TMR LUN_RESET with active se_cmd I/O, that can be triggered during se_cmd descriptor shutdown + release via core_tmr_drain_state_list() code. To address this bug, add common __target_check_io_state() helper for ABORT_TASK + LUN_RESET w/ CMD_T_COMPLETE checking, and set CMD_T_ABORTED + obtain ->cmd_kref for both cases ahead of last target_put_sess_cmd() after TFO->aborted_task() -> transport_cmd_finish_abort() callback has completed. It also introduces SCF_ACK_KREF to determine when transport_cmd_finish_abort() needs to drop the second extra reference, ahead of calling target_put_sess_cmd() for the final kref_put(&se_cmd->cmd_kref). It also updates transport_cmd_check_stop() to avoid holding se_cmd->t_state_lock while dropping se_cmd device state via target_remove_from_state_list(), now that core_tmr_drain_state_list() is holding the se_device lock while checking se_cmd state from within TMR logic. Finally, move transport_put_cmd() release of SGL + TMR + extended CDB memory into target_free_cmd_mem() in order to avoid potential resource leaks in TMR ABORT_TASK + LUN_RESET code-paths. Also update target_release_cmd_kref() accordingly. Reviewed-by: Quinn Tran <quinn.tran@qlogic.com> Cc: Himanshu Madhani <himanshu.madhani@qlogic.com> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Andy Grover <agrover@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: stable@vger.kernel.org # 3.10+ Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2016-01-20Merge branch 'for-next' of ↵Linus Torvalds1-2/+4
git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending Pull SCSI target updates from Nicholas Bellinger: "The highlights this round include: - Introduce configfs support for unlocked configfs_depend_item() (krzysztof + andrezej) - Conversion of usb-gadget target driver to new function registration interface (andrzej + sebastian) - Enable qla2xxx FC target mode support for Extended Logins (himansu + giridhar) - Enable qla2xxx FC target mode support for Exchange Offload (himansu + giridhar) - Add qla2xxx FC target mode irq affinity notification + selective command queuing. (quinn + himanshu) - Fix iscsi-target deadlock in se_node_acl configfs deletion (sagi + nab) - Convert se_node_acl configfs deletion + se_node_acl->queue_depth to proper se_session->sess_kref + target_get_session() usage. (hch + sagi + nab) - Fix long-standing race between se_node_acl->acl_kref get and get_initiator_node_acl() lookup. (hch + nab) - Fix target/user block-size handling, and make sure netlink reaches all network namespaces (sheng + andy) Note there is an outstanding bug-fix series for remote I_T nexus port TMR LUN_RESET has been posted and still being tested, and will likely become post -rc1 material at this point" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (56 commits) scsi: qla2xxxx: avoid type mismatch in comparison target/user: Make sure netlink would reach all network namespaces target: Obtain se_node_acl->acl_kref during get_initiator_node_acl target: Convert ACL change queue_depth se_session reference usage iscsi-target: Fix potential dead-lock during node acl delete ib_srpt: Convert acl lookup to modern get_initiator_node_acl usage tcm_fc: Convert acl lookup to modern get_initiator_node_acl usage tcm_fc: Wait for command completion before freeing a session target: Fix a memory leak in target_dev_lba_map_store() target: Support aborting tasks with a 64-bit tag usb/gadget: Remove set-but-not-used variables target: Remove an unused variable target: Fix indentation in target_core_configfs.c target/user: Allow user to set block size before enabling device iser-target: Fix non negative ERR_PTR isert_device_get usage target/fcoe: Add tag support to tcm_fc qla2xxx: Check for online flag instead of active reset when transmitting responses qla2xxx: Set all queues to 4k qla2xxx: Disable ZIO at start time. qla2xxx: Move atioq to a different lock to reduce lock contention ...
2016-01-07target: Remove an unused variableBart Van Assche1-2/+0
The num_node_acls member in struct se_portal_group is modified by several functions but is never read. Hence remove it. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Andy Grover <agrover@redhat.com> Cc: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2016-01-07qla2xxx: Add selective command queuingQuinn Tran1-0/+1
queue work element to specific process lessen cache miss Signed-off-by: Quinn Tran <quinn.tran@qlogic.com> Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2016-01-06target/sbc: Add LBPRZ attribute + control CDB emulationJamie Pocas1-0/+3
This change sets the LBPRZ flag in EVPD page b2h and READ CAPACITY (16) based on a new unmap_zeroes_data device attribute. This flag is set automatically for iblock based on underlying block device queue's discard_zeroes_data flag. Signed-off-by: Jamie Pocas <jamie.pocas@emc.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-11-28target: Fix race for SCF_COMPARE_AND_WRITE_POST checkingNicholas Bellinger1-1/+1
This patch addresses a race + use after free where the first stage of COMPARE_AND_WRITE in compare_and_write_callback() is rescheduled after the backend sends the secondary WRITE, resulting in second stage compare_and_write_post() callback completing in target_complete_ok_work() before the first can return. Because current code depends on checking se_cmd->se_cmd_flags after return from se_cmd->transport_complete_callback(), this results in first stage having SCF_COMPARE_AND_WRITE_POST set, which incorrectly falls through into second stage CAW processing code, eventually triggering a NULL pointer dereference due to use after free. To address this bug, pass in a new *post_ret parameter into se_cmd->transport_complete_callback(), and depend upon this value instead of ->se_cmd_flags to determine when to return or fall through into ->queue_status() code for CAW. Cc: Sagi Grimberg <sagig@mellanox.com> Cc: <stable@vger.kernel.org> # v3.12+ Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-11-13Merge branch 'for-next' of ↵Linus Torvalds1-0/+60
git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending Pull SCSI target updates from Nicholas Bellinger: "This series contains HCH's changes to absorb configfs attribute ->show() + ->store() function pointer usage from it's original tree-wide consumers, into common configfs code. It includes usb-gadget, target w/ drivers, netconsole and ocfs2 changes to realize the improved simplicity, that now renders the original include/target/configfs_macros.h CPP magic for fabric drivers and others, unnecessary and obsolete. And with common code in place, new configfs attributes can be added easier than ever before. Note, there are further improvements in-flight from other folks for v4.5 code in configfs land, plus number of target fixes for post -rc1 code" In the meantime, a new user of the now-removed old configfs API came in through the char/misc tree in commit 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices"). This merge resolution comes from Alexander Shishkin, who updated his stm class tracing abstraction to account for the removal of the old show_attribute and store_attribute methods in commit 517982229f78 ("configfs: remove old API") from this pull. As Alexander says about that patch: "There's no need to keep an extra wrapper structure per item and the awkward show_attribute/store_attribute item ops are no longer needed. This patch converts policy code to the new api, all the while making the code quite a bit smaller and easier on the eyes. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>" That patch was folded into the merge so that the tree should be fully bisectable. * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (23 commits) configfs: remove old API ocfs2/cluster: use per-attribute show and store methods ocfs2/cluster: move locking into attribute store methods netconsole: use per-attribute show and store methods target: use per-attribute show and store methods spear13xx_pcie_gadget: use per-attribute show and store methods dlm: use per-attribute show and store methods usb-gadget/f_serial: use per-attribute show and store methods usb-gadget/f_phonet: use per-attribute show and store methods usb-gadget/f_obex: use per-attribute show and store methods usb-gadget/f_uac2: use per-attribute show and store methods usb-gadget/f_uac1: use per-attribute show and store methods usb-gadget/f_mass_storage: use per-attribute show and store methods usb-gadget/f_sourcesink: use per-attribute show and store methods usb-gadget/f_printer: use per-attribute show and store methods usb-gadget/f_midi: use per-attribute show and store methods usb-gadget/f_loopback: use per-attribute show and store methods usb-gadget/ether: use per-attribute show and store methods usb-gadget/f_acm: use per-attribute show and store methods usb-gadget/f_hid: use per-attribute show and store methods ...
2015-10-13target: use per-attribute show and store methodsChristoph Hellwig1-0/+60
This also allows to remove the target-specific old configfs macros, and gets rid of the target_core_fabric_configfs.h header which only had one function declaration left that could be moved to a better place. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org> Acked-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-09-24target: Propigate backend read-only to core_tpg_add_lunNicholas Bellinger1-0/+1
This patch adds a DF_READ_ONLY flag that is used by IBLOCK to signal when a backend has been set to read-only mode, in order to propigate read-only status up to core_tpg_add_lun() for all future LUN fabric exports. With this is place, existing emulation for reporting read-only in spc_emulate_modesense() and normal transport_lookup_cmd_lun() TCM_WRITE_PROTECTED status checking just works as expected. Reported-by: Joeue Deng <joeue404@gmail.com> Reported-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-07-31target: Shrink struct se_cmd by rearranging fieldsRoland Dreier1-8/+8
On x86-64, these changes reduce the struct size from 528 bytes to 496 bytes. We save a cacheline and get under 512 bytes for better packing. Signed-off-by: Roland Dreier <roland@purestorage.com> Acked-by: Sagi Grimberg <sagig@mellanox.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-07-31target: Remove cmd->se_ordered_id (unused except debug log lines)Roland Dreier1-2/+0
For every command, we set se_ordered_id by doing atomic_inc_return on dev->dev_ordered_id for the corresponding device. However, the only places this value gets used are in pr_debug() calls, which doesn't seem worth an extra atomic op per IO. Signed-off-by: Roland Dreier <roland@purestorage.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-07-30target: remove initiatorname field in se_acl_lunChris Zankel1-1/+0
From: Chris Zankel <czankel@purestorage.com> The initiatorname field in se_acl_lun is only a copy of the same field in se_node_acl, so remove it and use the version in se_node_acl where needed (it's actually only used for pr_debug) Signed-off-by: Chris Zankel <czankel@purestorage.com> Signed-off-by: Spencer Baugh <spencer.baugh@purestorage.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-07-30target: remove unused lun_flags field from se_lunChris Zankel1-1/+0
The lun_flags field is not used, so drop it. Signed-off-by: Chris Zankel <czankel@purestorage.com> Signed-off-by: Spencer Baugh <spencer.baugh@purestorage.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-07-06target: Use struct t10_pi_tupleSagi Grimberg1-6/+1
Its not a good idea to keep target specific definition of the same t10-pi tuple. (Fix v4.2-rc1 patch fuzz - nab) Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-07-04Merge branch 'for-next' of ↵Linus Torvalds1-107/+79
git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending Pull SCSI target updates from Nicholas Bellinger: "It's been a busy development cycle for target-core in a number of different areas. The fabric API usage for se_node_acl allocation is now within target-core code, dropping the external API callers for all fabric drivers tree-wide. There is a new conversion to RCU hlists for se_node_acl and se_portal_group LUN mappings, that turns fast-past LUN lookup into a completely lockless code-path. It also removes the original hard-coded limitation of 256 LUNs per fabric endpoint. The configfs attributes for backends can now be shared between core and driver code, allowing existing drivers to use common code while still allowing flexibility for new backend provided attributes. The highlights include: - Merge sbc_verify_dif_* into common code (sagi) - Remove iscsi-target support for obsolete IFMarker/OFMarker (Christophe Vu-Brugier) - Add bidi support in target/user backend (ilias + vangelis + agover) - Move se_node_acl allocation into target-core code (hch) - Add crc_t10dif_update common helper (akinobu + mkp) - Handle target-core odd SGL mapping for data transfer memory (akinobu) - Move transport ID handling into target-core (hch) - Move task tag into struct se_cmd + support 64-bit tags (bart) - Convert se_node_acl->device_list[] to RCU hlist (nab + hch + paulmck) - Convert se_portal_group->tpg_lun_list[] to RCU hlist (nab + hch + paulmck) - Simplify target backend driver registration (hch) - Consolidate + simplify target backend attribute implementations (hch + nab) - Subsume se_port + t10_alua_tg_pt_gp_member into se_lun (hch) - Drop lun_sep_lock for se_lun->lun_se_dev RCU usage (hch + nab) - Drop unnecessary core_tpg_register TFO parameter (nab) - Use 64-bit LUNs tree-wide (hannes) - Drop left-over TARGET_MAX_LUNS_PER_TRANSPORT limit (hannes)" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (76 commits) target: Bump core version to v5.0 target: remove target_core_configfs.h target: remove unused TARGET_CORE_CONFIG_ROOT define target: consolidate version defines target: implement WRITE_SAME with UNMAP bit using ->execute_unmap target: simplify UNMAP handling target: replace se_cmd->execute_rw with a protocol_data field target/user: Fix inconsistent kmap_atomic/kunmap_atomic target: Send UA when changing LUN inventory target: Send UA upon LUN RESET tmr completion target: Send UA on ALUA target port group change target: Convert se_lun->lun_deve_lock to normal spinlock target: use 'se_dev_entry' when allocating UAs target: Remove 'ua_nacl' pointer from se_ua structure target_core_alua: Correct UA handling when switching states xen-scsiback: Fix compile warning for 64-bit LUN target: Remove TARGET_MAX_LUNS_PER_TRANSPORT target: use 64-bit LUNs target: Drop duplicate + unused se_dev_check_wce target: Drop unnecessary core_tpg_register TFO parameter ...
2015-06-23target: Bump core version to v5.0Nicholas Bellinger1-1/+1
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-23target: consolidate version definesChristoph Hellwig1-2/+1
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-23target: replace se_cmd->execute_rw with a protocol_data fieldChristoph Hellwig1-2/+1
Instead of leaking this SBC read/write implementation detail just add an opaqueue protocol specific pointer to struct se_cmd that we can assign the sbc_ops vector to. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-16target: Remove 'ua_nacl' pointer from se_ua structureHannes Reinecke1-1/+0
Unused. Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-15target: Remove TARGET_MAX_LUNS_PER_TRANSPORTHannes Reinecke1-3/+0
LUN allocation is now fully dynamic, so there is no need to artificially restrain the number of exported LUNs. Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-15target: use 64-bit LUNsHannes Reinecke1-9/+10
As we're now using a list to hold the LUNs the target core can now converted to use 64-bit LUNs internally. Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-02target: Minimize SCSI header #include directivesBart Van Assche1-2/+1
Only include SCSI initiator header files in target code that needs these header files, namely the SCSI pass-through code and the tcm_loop driver. Change SCSI_SENSE_BUFFERSIZE into TRANSPORT_SENSE_BUFFER in target code because the former is intended for initiator code and the latter for target code. With this patch the only initiator include directives in target code that remain are as follows: $ git grep -nHE 'include .scsi/(scsi.h|scsi_host.h|scsi_device.h|scsi_cmnd.h)' drivers/target drivers/infiniband/ulp/{isert,srpt} drivers/usb/gadget/legacy/tcm_*.[ch] drivers/{vhost,xen} include/{target,trace/events/target.h} drivers/target/loopback/tcm_loop.c:29:#include <scsi/scsi.h> drivers/target/loopback/tcm_loop.c:31:#include <scsi/scsi_host.h> drivers/target/loopback/tcm_loop.c:32:#include <scsi/scsi_device.h> drivers/target/loopback/tcm_loop.c:33:#include <scsi/scsi_cmnd.h> drivers/target/target_core_pscsi.c:39:#include <scsi/scsi_device.h> drivers/target/target_core_pscsi.c:40:#include <scsi/scsi_host.h> drivers/xen/xen-scsiback.c:52:#include <scsi/scsi_host.h> /* SG_ALL */ Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-06-02target: Correct a commentBart Van Assche1-10/+2
Correct the comment above the definition of TCM_MAX_COMMAND_SIZE. A quote from Christoph: There aren't any legacy issues, we just decided to handle > 16 byte CDBs in the slow path. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-06-01target: Drop se_lun->lun_active for existing percpu lun_refNicholas Bellinger1-1/+0
With se_port_t and t10_alua_tg_pt_gp_member being absored into se_lun, there is no need for an extra atomic_t based reference count for PR ALL_TG_PT=1 and ALUA access state transition. Go ahead and use the existing percpu se_lun->lun_ref instead, and convert the two special cases to percpu_ref_tryget_live() to avoid se_lun if transport_clear_lun_ref() has already been invoked to shutdown the se_lun. Cc: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target: Drop lun_sep_lock for se_lun->lun_se_dev RCU usageNicholas Bellinger1-4/+6
With se_port and t10_alua_tg_pt_gp_member being absored into se_lun, there is no need for an extra lock to protect se_lun->lun_se_dev assignment. This patch also converts backend drivers to use call_rcu() release to allow any se_device readers to complete. The call_rcu() instead of kfree_rcu() is required here because se_device is embedded into the backend driver specific structure. Also, convert se_lun->lun_stats to use atomic_long_t within the target_complete_ok_work() completion callback, and add FIXME for transport_lookup_tmr_lun() with se_lun->lun_ref. Finally, update sbp_update_unit_directory() special case usage with proper rcu_dereference_raw() and configfs symlink comment. Reported-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Chris Boot <bootc@bootc.net> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target: Subsume se_port + t10_alua_tg_pt_gp_member into se_lunChristoph Hellwig1-42/+32
This patch eliminates all se_port + t10_alua_tg_pt_gp_member usage, and converts current users to direct se_lun pointer dereference. This includes the removal of core_export_port(), core_release_port() core_dev_export() and core_dev_unexport(). Along with conversion of special case se_lun pointer dereference within PR ALL_TG_PT=1 and ALUA access state transition UNIT_ATTENTION handling. Also, update core_enable_device_list_for_node() to reference the new per se_lun->lun_deve_list when creating a new entry, or replacing an existing one via RCU. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target: Simplify LUN shutdown codeBart Van Assche1-1/+0
Instead of starting a thread from transport_clear_lun_ref() that waits for LUN shutdown, wait in that function for LUN shutdown to finish. Additionally, change the return type of transport_clear_lun_ref() from int to void. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target: simplify backend driver registrationChristoph Hellwig1-2/+2
Rewrite the backend driver registration based on what we did to the fabric drivers: introduce a read-only struct target_bakckend_ops that the driver registers, which is then instanciate as a struct target_backend by the core. This allows the ops vector to be smaller and allows us to mark it const. At the same time the registration function can set up the configfs attributes, avoiding the need to add additional boilerplate code for that to the drivers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target: Drop left-over se_lun->lun_statusNicholas Bellinger1-8/+0
Now that se_portal_group->tpg_lun_hlist is a RCU protected hlist, go ahead and drop the left-over lun->lun_status usage. Reported-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target: Drop unused se_lun->lun_acl_listNicholas Bellinger1-3/+0
Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target: Convert se_tpg->acl_node_lock to ->acl_node_mutexNicholas Bellinger1-1/+1
This patch converts se_tpg->acl_node_lock to struct mutex, so that ->acl_node_acl walkers in core_clear_lun_from_tpg() can block when calling core_disable_device_list_for_node(). It also updates core_dev_add_lun() to hold ->acl_node_mutex when calling core_tpg_add_node_to_devs() to build ->lun_entry_hlist for dynamically generated se_node_acl. Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target: Convert se_portal_group->tpg_lun_list[] to RCU hlistNicholas Bellinger1-2/+4
This patch converts the fixed size se_portal_group->tpg_lun_list[] to use modern RCU with hlist_head in order to support an arbitary number of se_lun ports per target endpoint. It includes dropping core_tpg_alloc_lun() from core_dev_add_lun(), and calling it directly from target_fabric_make_lun() to allocate a new se_lun. And add a new target_fabric_port_release() configfs item callback to invoke kfree_rcu() to release memory during se_lun->lun_group shutdown. Also now that se_node_acl->lun_entry_hlist is using RCU, convert existing tpg_lun_lock to struct mutex so core_tpg_add_node_to_devs() can perform RCU updater logic without releasing ->tpg_lun_mutex. Also, drop core_tpg_clear_object_luns() and it's single consumer in iscsi-target, which is duplicating TPG LUN shutdown logic and is current code results in a NOP. Finally, sbp-target and xen-scsiback fabric driver conversions are included, which are required due to the non-standard way they use ->tpg_lun_hlist. Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Chris Boot <bootc@bootc.net> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target/pr: Change alloc_registration to avoid pr_reg_tg_pt_lunNicholas Bellinger1-2/+2
This patch changes __core_scsi3_do_alloc_registration() code to drop pr_reg->pr_reg_tg_pt_lun pointer usage in favor of a new pr_reg RPTI + existing pr_reg->pr_aptpl_target_lun used by APTPL metadata logic. It also includes changes to REGISTER, REGISTER_AND_MOVE and APTPL feature bit codepaths to use rcu_dereference_check() with the expected non-zero se_dev_entry->pr_kref reference held. Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target/pr: Use atomic bitop for se_dev_entry->deve_flags reservation checkNicholas Bellinger1-1/+2
This patch converts the core_scsi3_pr_seq_non_holder() check for non reservation holding registrations to use an atomic bitop in ->deve_flags to determine if a registration is currently active. It also includes associated a set_bit() in __core_scsi3_add_registration() and clear_bit() in __core_scsi3_free_registration(), if se_dev_entry still exists, and has not already been released via se_dev_entry shutdown path in core_disable_device_list_for_node(). Also, clear_bit in core_disable_device_list_for_node as well to ensure the read-critical path in core_scsi3_pr_seq_non_holder() picks up the new state, preceeding the final kfree_rcu() call. Reported-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01target: Convert se_node_acl->device_list[] to RCU hlistNicholas Bellinger1-12/+15
This patch converts se_node_acl->device_list[] table for mappedluns to modern RCU hlist_head usage in order to support an arbitrary number of node_acl lun mappings. It converts transport_lookup_*_lun() fast-path code to use RCU read path primitives when looking up se_dev_entry. It adds a new hlist_head at se_node_acl->lun_entry_hlist for this purpose. For transport_lookup_cmd_lun() code, it works with existing per-cpu se_lun->lun_ref when associating se_cmd with se_lun + se_device. Also, go ahead and update core_create_device_list_for_node() + core_free_device_list_for_node() to use ->lun_entry_hlist. It also converts se_dev_entry->pr_ref_count access to use modern struct kref counting, and updates core_disable_device_list_for_node() to kref_put() and block on se_deve->pr_comp waiting for outstanding PR special-case PR references to drop, then invoke kfree_rcu() to wait for the RCU grace period to complete before releasing memory. So now that se_node_acl->lun_entry_hlist fast path access uses RCU protected pointers, go ahead and convert remaining non-fast path RCU updater code using ->lun_entry_lock to struct mutex to allow callers to block while walking se_node_acl->lun_entry_hlist. Finally drop the left-over core_clear_initiator_node_from_tpg() that originally cleared lun_access during se_node_acl shutdown, as post RCU conversion it now becomes duplicated logic. Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-05-30target: Move task tag into struct se_cmd + support 64-bit tagsBart Van Assche1-1/+2
Simplify target core and target drivers by storing the task tag a.k.a. command identifier inside struct se_cmd. For several transports (e.g. SRP) tags are 64 bits wide. Hence add support for 64-bit tags. (Fix core_tmr_abort_task conversion spec warnings - nab) (Fix up usb-gadget to use 16-bit tags - HCH + bart) Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Andy Grover <agrover@redhat.com> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: <qla2xxx-upstream@qlogic.com> Cc: Felipe Balbi <balbi@ti.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Juergen Gross <jgross@suse.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-05-30target: change core_tpg_register prototypeChristoph Hellwig1-10/+6
Remove the unneeded fabric_ptr argument, and change the type argument to pass in a SPC protocol identifier. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-05-30target: ensure se_cmd->t_prot_sg is allocated when requiredAkinobu Mita1-0/+1
Even if the device backend is initialized with protection info is enabled, some requests don't have the protection info attached for WRITE SAME command issued by block device helpers, WRITE command with WRPROTECT=0 by SG_IO ioctl, etc. So when TCM loopback fabric module is used, se_cmd->t_prot_sg is NULL for these requests and performing WRITE_INSERT of PI using software emulation by sbc_dif_generate() causes kernel crash. To fix this, introduce SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC for se_cmd_flags, which is used to determine that se_cmd->t_prot_sg needs to be allocated or use pre-allocated protection information by scsi mid-layer. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: target-devel@vger.kernel.org Cc: linux-scsi@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-05-30target: fix DPO and FUA bit checksChristoph Hellwig1-6/+0
Drivers may override the WCE flag, in which case the DPOFUA flag in MODE SENSE might differ from the check used to reject invalid FUA bits in sbc_check_dpofua. Also now that we reject invalid FUA bits early there is no need to duplicate the same buggy check down in the fileio code. As the DPOFUA flag controls th support for FUA bits on read and write commands as well as DPO key off all the checks off a single helper, and deprecate the emulate_dpo and emulate_fua_read attributs. This fixes various failures in the libiscsi testsuite. Personally I'd prefer to also remove the emulate_fua_write attribute as there is no good reason to disable it, but I'll leave that for a separate discussion. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-04-15target: Ensure sess_prot_type is saved across session restartNicholas Bellinger1-0/+1
The following incremental patch saves the current sess_prot_type into se_node_acl, and will always reset sess_prot_type if a previous saved value exists. So the PI setting for the fabric's session with backend devices not supporting PI is persistent across session restart. (Fix se_node_acl dereference for discovery sessions - DanCarpenter) Reviewed-by: Martin Petersen <martin.petersen@oracle.com> Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-04-14target: Remove the unused flag SCF_ACK_KREFBart Van Assche1-1/+0
The flag SCF_ACK_KREF is only set but never tested. Hence remove this flag. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-04-14target: Fix COMPARE_AND_WRITE with SG_TO_MEM_NOALLOC handlingNicholas Bellinger1-1/+1
This patch fixes a bug for COMPARE_AND_WRITE handling with fabrics using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC. It adds the missing allocation for cmd->t_bidi_data_sg within transport_generic_new_cmd() that is used by COMPARE_AND_WRITE for the initial READ payload, even if the fabric is already providing a pre-allocated buffer for cmd->t_data_sg. Also, fix zero-length COMPARE_AND_WRITE handling within the compare_and_write_callback() and target_complete_ok_work() to queue the response, skipping the initial READ. This fixes COMPARE_AND_WRITE emulation with loopback, vhost, and xen-backend fabric drivers using SG_TO_MEM_NOALLOC. Reported-by: Christoph Hellwig <hch@lst.de> Cc: Christoph Hellwig <hch@lst.de> Cc: <stable@vger.kernel.org> # v3.12+ Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-04-14target: simplify the target template registration APIChristoph Hellwig1-2/+2
Instead of calling target_fabric_configfs_init() + target_fabric_configfs_register() / target_fabric_configfs_deregister() target_fabric_configfs_free() from every target driver, rewrite the API so that we have simple register/unregister functions that operate on a const operations vector. This patch also fixes a memory leak in several target drivers. Several target drivers namely called target_fabric_configfs_deregister() without calling target_fabric_configfs_free(). A large part of this patch is based on earlier changes from Bart Van Assche <bart.vanassche@sandisk.com>. (v2: Add a new TF_CIT_SETUP_DRV macro so that the core configfs code can declare attributes as either core only or for drivers) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-04-07target: remove the unused SCF_CMD_XCOPY_PASSTHROUGH flagChristoph Hellwig1-1/+0
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-04-07target: Add protected fabric + unprotected device supportNicholas Bellinger1-0/+1
This patch adds a new target_core_fabric_ops callback for allowing fabric drivers to expose a TPG attribute for signaling when a T10-PI protected fabric wants to function with an un-protected device without T10-PI. This specifically is to allow LIO to perform WRITE_STRIP + READ_INSERT operations when functioning with non T10-PI enabled devices, seperate from any available hw offloads the fabric supports. This is done using a new se_sess->sess_prot_type that is set at fabric session creation time based upon the TPG attribute. It currently cannot be changed for individual sessions after initial creation. Also, update existing target_core_sbc.c code to honor sess_prot_type when setting up cmd->prot_op + cmd->prot_type assignments. (Add unlikely and !! boolean conversion in sbc_check_prot - Sagi) Cc: Martin Petersen <martin.petersen@oracle.com> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Doug Gilbert <dgilbert@interlog.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-02-21Merge branch 'for-next' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending Pull SCSI target updates from Nicholas Bellinger: "The highlights this round include: - Update vhost-scsi to support F_ANY_LAYOUT using mm/iov_iter.c logic, and signal VERSION_1 support (MST + Viro + nab) - Fix iscsi/iser-target to remove problematic active_ts_set usage (Gavin Guo) - Update iscsi/iser-target to support multi-sequence sendtargets (Sagi) - Fix original PR_APTPL_BUF_LEN 8k size limitation (Martin Svec) - Add missing WRITE_SAME end-of-device sanity check (Bart) - Check for LBA + sectors wrap-around in sbc_parse_cdb() (nab) - Other various minor SPC/SBC compliance fixes based upon Ronnie Sahlberg test suite (nab)" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (32 commits) target: Set LBPWS10 bit in Logical Block Provisioning EVPD target: Fail UNMAP when emulate_tpu=0 target: Fail WRITE_SAME w/ UNMAP=1 when emulate_tpws=0 target: Add sanity checks for DPO/FUA bit usage target: Perform PROTECT sanity checks for WRITE_SAME target: Fail I/O with PROTECT bit when protection is unsupported target: Check for LBA + sectors wrap-around in sbc_parse_cdb target: Add missing WRITE_SAME end-of-device sanity check iscsi-target: Avoid IN_LOGOUT failure case for iser-target target: Fix PR_APTPL_BUF_LEN buffer size limitation iscsi-target: Drop problematic active_ts_list usage iscsi/iser-target: Support multi-sequence sendtargets text response iser-target: Remove duplicate function names vhost/scsi: potential memory corruption vhost/scsi: Global tcm_vhost -> vhost_scsi rename vhost/scsi: Drop left-over scsi_tcq.h include vhost/scsi: Set VIRTIO_F_ANY_LAYOUT + VIRTIO_F_VERSION_1 feature bits vhost/scsi: Add ANY_LAYOUT support in vhost_scsi_handle_vq vhost/scsi: Add ANY_LAYOUT iov -> sgl mapping prerequisites vhost/scsi: Change vhost_scsi_map_to_sgl to accept iov ptr + len ...
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