- 07 Jul, 2017 30 commits
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Xiubo Li authored
Because the unmap code just after the schdule() returned may take a long time and if the kthread_stop() is fired just when in this routine, the module removal maybe stuck too. Signed-off-by:
Xiubo Li <lixiubo@cmss.chinamobile.com> Reviewed-by:
Mike Christie <mchristi@redhat.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Jiang Yi authored
This patch addresses a COMPARE_AND_WRITE se_device->caw_sem leak, that would be triggered during normal se_cmd shutdown or abort via __transport_wait_for_tasks(). This would occur because target_complete_cmd() would catch this early and do complete_all(&cmd->t_transport_stop_comp), but since target_complete_ok_work() or target_complete_failure_work() are never called to invoke se_cmd->transport_complete_callback(), the COMPARE_AND_WRITE specific callbacks never release caw_sem. To address this special case, go ahead and release caw_sem directly from target_complete_cmd(). (Remove '&& success' from check, to release caw_sem regardless of scsi_status - nab) Signed-off-by:
Jiang Yi <jiangyilism@gmail.com> Cc: <stable@vger.kernel.org> # 3.14+ Signed-off-by:
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Bryant G. Ly authored
This patch adds more info about the attribute being changed, so that usersapce can easily figure out what is happening. Signed-off-by:
Bryant G. Ly <bryantly@linux.vnet.ibm.com> Reviewed-By:
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Bryant G. Ly authored
This allows for userspace to change the device path after it has been created. Thus giving the user the ability to change the path. The use case for this is to allow for virtual optical to have media change. Signed-off-by:
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Bryant G. Ly authored
Allow tcmu backstores to be able to set the device size after it has been configured via set attribute. Part of support in userspace to support certain backstores changing device size. Signed-off-by:
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Bryant G. Ly authored
This gives tcmu the ability to handle events that can cause reconfiguration, such as resize, path changes, write_cache, etc... Signed-off-by:
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Bryant G. Ly authored
This will enable the toggling of write_cache in tcmu through targetcli-fb Signed-off-by:
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Bryant G. Ly authored
ibmvscsis always returned 0 for the tpg/tag, since it did not parse the value passed in by the user. When functions like ALUA members exports the value, it will be incorrect because targetcli/rtslib starts the tpg numbering at 1. Signed-off-by:
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Bart Van Assche authored
If an iSCSI command is rejected before iscsit_process_scsi_cmd() is called, .reject_reason is set but iscsit_process_scsi_cmd() is not called. This means that the "if (cmd->reject_reason) ..." code in this function can be removed without changing the behavior of this function. Signed-off-by:
Bart Van Assche <bart.vanassche@sandisk.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Andy Grover <agrover@redhat.com> Cc: David Disseldorp <ddiss@suse.de> Signed-off-by:
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Bart Van Assche authored
Since .se_tfo is only set if a command has been submitted to the LIO core, check .se_tfo instead of .iscsi_opcode. Since __iscsit_free_cmd() only affects SCSI commands but not TMFs, calling that function for TMFs does not change behavior. This patch does not change the behavior of iscsit_free_cmd(). Signed-off-by:
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Bart Van Assche authored
Initialize .data_direction to DMA_NONE in iscsit_allocate_cmd() such that the second argument of __iscsit_free_cmd() can be left out. Note: this patch causes the first part of __iscsit_free_cmd() no longer to be skipped for TMFs. That's fine since no data segments are associated with TMFs. Signed-off-by:
Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Andy Grover <agrover@redhat.com> Cc: David Disseldorp <ddiss@suse.de> Signed-off-by:
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Bart Van Assche authored
Target drivers must guarantee that struct se_cmd and struct se_tmr_req exist as long as target_tmr_work() is in progress. This is why the tcm_loop driver today passes 1 as second argument to transport_generic_free_cmd() from inside the TMF code. Instead of making the TMF code wait, make the TMF code obtain two references (SCF_ACK_KREF) and drop one reference from inside the .check_stop_free() callback. Signed-off-by:
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Bart Van Assche authored
Use target_submit_tmr() instead of open-coding this function. The only functional change is that TMFs are now added to sess_cmd_list, something the current code does not do. This behavior change is a bug fix because it makes LUN RESETs wait for other TMFs that are in progress for the same LUN. Signed-off-by:
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Bart Van Assche authored
This patch simplifies the implementation of the tcm_loop driver but does not change its behavior. Signed-off-by:
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Bart Van Assche authored
This patch simplifies the tcm_loop implementation but does not change any functionality. Signed-off-by:
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Bart Van Assche authored
Introduce target_show_cmd() and use it where appropriate. If transport_wait_for_tasks() takes too long, make it show the state of the command it is waiting for. (Add missing brackets around multi-line conditions - nab) Signed-off-by:
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Nicholas Bellinger authored
With commit 25cdda95 in place to address the initial login PDU asynchronous socket close OOPs, go ahead and kill off the left-over iscsi_target_do_cleanup() and ->login_cleanup_work. Reported-by:
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Bart Van Assche authored
Target drivers must guarantee that struct se_cmd and struct se_tmr_req exist as long as target_tmr_work() is in progress. Since the last access by the LIO core is a call to .check_stop_free() and since the Xen scsiback .check_stop_free() drops a reference to the TMF, it is already guaranteed that the struct se_cmd that corresponds to the TMF exists as long as target_tmr_work() is in progress. Hence change the second argument of transport_generic_free_cmd() from 1 into 0. Signed-off-by:
Juergen Gross <jgross@suse.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Cc: David Disseldorp <ddiss@suse.de> Cc: xen-devel@lists.xenproject.org Signed-off-by:
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Bart Van Assche authored
This patch simplifies the implementation of the scsiback driver but does not change its behavior. Signed-off-by:
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Bart Van Assche authored
scsiback_release_cmd() must not dereference se_cmd->se_tmr_req because that memory is freed by target_free_cmd_mem() before scsiback_release_cmd() is called. Fix this use-after-free by inlining struct scsiback_tmr into struct vscsibk_pend. Signed-off-by:
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Bart Van Assche authored
Do not only report the state of the I/O context before srpt_abort_cmd() was called but also the new state assigned by srpt_abort_cmd() Signed-off-by:
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Bart Van Assche authored
Move the code for parsing an XCOPY command from the context of the iSCSI receiver thread to the context of the XCOPY workqueue. Keep the simple XCOPY checks in the context of the iSCSI receiver thread. Move the code for allocating and freeing struct xcopy_op from the code that parses an XCOPY command to its caller. This patch fixes the following deadlock: ====================================================== [ INFO: possible circular locking dependency detected ] 4.10.0-rc7-dbg+ #1 Not tainted ------------------------------------------------------- rmdir/13321 is trying to acquire lock: (&sess->cmdsn_mutex){+.+.+.}, at: [<ffffffffa02cb47d>] iscsit_free_all_ooo_cmdsns+0x2d/0xb0 [iscsi_target_mod] but task is already holding lock: (&sb->s_type->i_mutex_key#14){++++++}, at: [<ffffffff811c6e20>] vfs_rmdir+0x50/0x140 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#14){++++++}: lock_acquire+0x71/0x90 down_write+0x3f/0x70 configfs_depend_item+0x3a/0xb0 [configfs] target_depend_item+0x13/0x20 [target_core_mod] target_xcopy_locate_se_dev_e4+0xdd/0x1a0 [target_core_mod] target_do_xcopy+0x34b/0x970 [target_core_mod] __target_execute_cmd+0x22/0xa0 [target_core_mod] target_execute_cmd+0x233/0x2c0 [target_core_mod] iscsit_execute_cmd+0x208/0x270 [iscsi_target_mod] iscsit_sequence_cmd+0x10b/0x190 [iscsi_target_mod] iscsit_get_rx_pdu+0x37d/0xcd0 [iscsi_target_mod] iscsi_target_rx_thread+0x6e/0xa0 [iscsi_target_mod] kthread+0x102/0x140 ret_from_fork+0x31/0x40 -> #0 (&sess->cmdsn_mutex){+.+.+.}: __lock_acquire+0x10e6/0x1260 lock_acquire+0x71/0x90 mutex_lock_nested+0x5f/0x670 iscsit_free_all_ooo_cmdsns+0x2d/0xb0 [iscsi_target_mod] iscsit_close_session+0xac/0x200 [iscsi_target_mod] lio_tpg_close_session+0x9f/0xb0 [iscsi_target_mod] target_shutdown_sessions+0xc3/0xd0 [target_core_mod] core_tpg_del_initiator_node_acl+0x91/0x140 [target_core_mod] target_fabric_nacl_base_release+0x20/0x30 [target_core_mod] config_item_release+0x5a/0xc0 [configfs] config_item_put+0x1d/0x1f [configfs] configfs_rmdir+0x1a6/0x300 [configfs] vfs_rmdir+0xb7/0x140 do_rmdir+0x1f4/0x200 SyS_rmdir+0x11/0x20 entry_SYSCALL_64_fastpath+0x23/0xc6 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#14); lock(&sess->cmdsn_mutex); lock(&sb->s_type->i_mutex_key#14); lock(&sess->cmdsn_mutex); *** DEADLOCK *** 3 locks held by rmdir/13321: #0: (sb_writers#10){.+.+.+}, at: [<ffffffff811e1aff>] mnt_want_write+0x1f/0x50 #1: (&default_group_class[depth - 1]#2/1){+.+.+.}, at: [<ffffffff811cc8ce>] do_rmdir+0x15e/0x200 #2: (&sb->s_type->i_mutex_key#14){++++++}, at: [<ffffffff811c6e20>] vfs_rmdir+0x50/0x140 stack backtrace: CPU: 2 PID: 13321 Comm: rmdir Not tainted 4.10.0-rc7-dbg+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014 Call Trace: dump_stack+0x86/0xc3 print_circular_bug+0x1c7/0x220 __lock_acquire+0x10e6/0x1260 lock_acquire+0x71/0x90 mutex_lock_nested+0x5f/0x670 iscsit_free_all_ooo_cmdsns+0x2d/0xb0 [iscsi_target_mod] iscsit_close_session+0xac/0x200 [iscsi_target_mod] lio_tpg_close_session+0x9f/0xb0 [iscsi_target_mod] target_shutdown_sessions+0xc3/0xd0 [target_core_mod] core_tpg_del_initiator_node_acl+0x91/0x140 [target_core_mod] target_fabric_nacl_base_release+0x20/0x30 [target_core_mod] config_item_release+0x5a/0xc0 [configfs] config_item_put+0x1d/0x1f [configfs] configfs_rmdir+0x1a6/0x300 [configfs] vfs_rmdir+0xb7/0x140 do_rmdir+0x1f4/0x200 SyS_rmdir+0x11/0x20 entry_SYSCALL_64_fastpath+0x23/0xc6 Signed-off-by: -
Bart Van Assche authored
Introduce the function get_unaligned_be24(). Use {get,put}_unaligned_be*() where appropriate. This patch does not change any functionality. Signed-off-by:Christoph Hellwig <hch@lst.de> Reviewed-by:
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Bart Van Assche authored
Avoid that aborting a command before it has been submitted onto a workqueue triggers the following warning: INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. CPU: 3 PID: 46 Comm: kworker/u8:1 Not tainted 4.12.0-rc2-dbg+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014 Workqueue: tmr-iblock target_tmr_work [target_core_mod] Call Trace: dump_stack+0x86/0xcf register_lock_class+0xe8/0x570 __lock_acquire+0xa1/0x11d0 lock_acquire+0x59/0x80 flush_work+0x42/0x2b0 __cancel_work_timer+0x10c/0x180 cancel_work_sync+0xb/0x10 core_tmr_lun_reset+0x352/0x740 [target_core_mod] target_tmr_work+0xd6/0x130 [target_core_mod] process_one_work+0x1ca/0x3f0 worker_thread+0x49/0x3b0 kthread+0x109/0x140 ret_from_fork+0x31/0x40 Signed-off-by:
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Bart Van Assche authored
The last user of se_device.dev_list was removed through commit 0fd97ccf ("target: kill struct se_subsystem_dev"). Hence also remove se_device.dev_list. Signed-off-by:
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Bart Van Assche authored
Now that a symbolic value has been introduced for WRITE_VERIFY_16, use it. This patch does not change any functionality. References: commit c2d26f18 ("target: Add WRITE_VERIFY_16") Signed-off-by:
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Nicholas Bellinger authored
Following Himanshu's earlier patch to drop the redundant tag lookup within __qlt_24xx_handle_abts(), go ahead and drop this now QLA_TGT_ABTS can use TARGET_SCF_LOOKUP_LUN_FROM_TAG and have target_submit_tmr() do this from common code. Reviewed-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Acked-by:
Quinn Tran <quinn.tran@cavium.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by:
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Nicholas Bellinger authored
This patch introduces support in target_submit_tmr() for locating a unpacked_lun from an existing se_cmd->tag during ABORT_TASK. When TARGET_SCF_LOOKUP_LUN_FROM_TAG is set, target_submit_tmr() will do the extra lookup via target_lookup_lun_from_tag() and subsequently invoke transport_lookup_tmr_lun() so a proper percpu se_lun->lun_ref is taken before workqueue dispatch into se_device->tmr_wq happens. Aside from the extra target_lookup_lun_from_tag(), the existing code-path remains unchanged. Reviewed-by:
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Nicholas Bellinger authored
This patch introduces TMR percpu reference counting using se_lun->lun_ref in transport_lookup_tmr_lun(), following how existing non TMR per se_lun reference counting works within transport_lookup_cmd_lun(). It also adds explicit transport_lun_remove_cmd() calls to drop the reference in the three tmr related locations that invoke transport_cmd_check_stop_to_fabric(); - target_tmr_work() during normal ->queue_tm_rsp() - target_complete_tmr_failure() during error ->queue_tm_rsp() - transport_generic_handle_tmr() during early failure Also, note the exception paths in transport_generic_free_cmd() and transport_cmd_finish_abort() already check SCF_SE_LUN_CMD, and will invoke transport_lun_remove_cmd() when necessary. Reviewed-by:
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Jiang Yi authored
In struct se_dev_attrib, there is a field emulate_caw exposed as a /sys/kernel/config/target/core/$HBA/$DEV/attrib/. If this field is set zero, it means the corresponding struct se_device does not support the scsi cmd COMPARE_AND_WRITE In function sbc_parse_cdb(), go ahead and reject scsi COMPARE_AND_WRITE if emulate_caw is not set, because it has been explicitly disabled from user-space. (Make pr_err ratelimited - nab) Signed-off-by:
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- 09 Jun, 2017 10 commits
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Nicholas Bellinger authored
As originally reported by Jia-Ju, iscsit_tpg_enable_portal_group() holds iscsi_portal_group->tpg_state_lock while updating AUTHMETHOD via iscsi_update_param_value(), which performs a GFP_KERNEL allocation. However, since iscsit_tpg_enable_portal_group() is already protected by iscsit_get_tpg() -> iscsi_portal_group->tpg_access_lock in it's parent caller, ->tpg_state_lock only needs to be held when setting TPG_STATE_ACTIVE. Reported-by:
Jia-Ju Bai <baijiaju1990@163.com> Reviewed-by:
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Nicholas Bellinger authored
Instead of using a hardcoded magic value in se_lun when verifying a target config_item symlink source during target_fabric_mappedlun_link(), go ahead and use target_fabric_port_item_ops directly instead. Reviewed-by:
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Nicholas Bellinger authored
Instead of using a hardcoded magic value in se_device when verifying a target config_item symlink source during target_fabric_port_link(), go ahead and use target_core_dev_item_ops directly instead. Reviewed-by:
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Nicholas Bellinger authored
The people who are actively using iblock_execute_write_same_direct() are doing so in the context of ESX VAAI BlockZero, together with EXTENDED_COPY and COMPARE_AND_WRITE primitives. In practice though I've not seen any users of IBLOCK WRITE_SAME for anything other than VAAI BlockZero, so just using blkdev_issue_zeroout() when available, and falling back to iblock_execute_write_same() if the WRITE_SAME buffer contains anything other than zeros should be OK. (Hook up max_write_zeroes_sectors to signal LBPRZ feature bit in target_configure_unmap_from_queue - nab) Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Jens Axboe <axboe@fb.com> Signed-off-by:
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Michael Cyr authored
Changes to support a new mechanism from phyp to better synchronize the logical partition migration (LPM) of the client partition. This includes a new VIOCTL to register that we support this new functionality, and 2 new Transport Event types, and finally another new VIOCTL to let phyp know once we're ready for the Suspend. Signed-off-by:
Michael Cyr <mikecyr@us.ibm.com> Signed-off-by:
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Byungchul Park authored
Although llist provides proper APIs, they are not used. Make them used. Signed-off-by:
Byungchul Park <byungchul.park@lge.com> Acked-by:
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Gustavo A. R. Silva authored
Local variable _ret_ is assigned to a constant value and it is never updated again. Remove this variable and the dead code it guards. Addresses-Coverity-ID: 140761 Signed-off-by:
Gustavo A. R. Silva <garsilva@embeddedor.com> Reviewed-by:
Tyrel Datwyler <tyreld@linux.vnet.ibm.com> Signed-off-by:
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Nicholas Bellinger authored
When iscsi WRITE underflow occurs there are two different scenarios that can happen. Normally in practice, when an EDTL vs. SCSI CDB TRANSFER LENGTH underflow is detected, the iscsi immediate data payload is the smaller SCSI CDB TRANSFER LENGTH. That is, when a host fabric LLD is using a fixed size EDTL for a specific control CDB, the SCSI CDB TRANSFER LENGTH and actual SCSI payload ends up being smaller than EDTL. In iscsi, this means the received iscsi immediate data payload matches the smaller SCSI CDB TRANSFER LENGTH, because there is no more SCSI payload to accept beyond SCSI CDB TRANSFER LENGTH. However, it's possible for a malicous host to send a WRITE underflow where EDTL is larger than SCSI CDB TRANSFER LENGTH, but incoming iscsi immediate data actually matches EDTL. In the wild, we've never had a iscsi host environment actually try to do this. For this special case, it's wrong to truncate part of the control CDB payload and continue to process the command during underflow when immediate data payload received was larger than SCSI CDB TRANSFER LENGTH, so go ahead and reject and drop the bogus payload as a defensive action. Note this potential bug was originally relaxed by the following for allowing WRITE underflow in MSFT FCP host environments: commit c72c5250 Author: Roland Dreier <roland@purestorage.com> Date: Wed Jul 22 15:08:18 2015 -0700 target: allow underflow/overflow for PR OUT etc. commands Cc: Roland Dreier <roland@purestorage.com> Cc: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: <stable@vger.kernel.org> # v4.3+ Signed-off-by:
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Nicholas Bellinger authored
This patch fixes a BUG() in iscsit_close_session() that could be triggered when iscsit_logout_post_handler() execution from within tx thread context was not run for more than SECONDS_FOR_LOGOUT_COMP (15 seconds), and the TCP connection didn't already close before then forcing tx thread context to automatically exit. This would manifest itself during explicit logout as: [33206.974254] 1 connection(s) still exist for iSCSI session to iqn.1993-08.org.debian:01:3f5523242179 [33206.980184] INFO: NMI handler (kgdb_nmi_handler) took too long to run: 2100.772 msecs [33209.078643] ------------[ cut here ]------------ [33209.078646] kernel BUG at drivers/target/iscsi/iscsi_target.c:4346! Normally when explicit logout attempt fails, the tx thread context exits and iscsit_close_connection() from rx thread context does the extra cleanup once it detects conn->conn_logout_remove has not been cleared by the logout type specific post handlers. To address this special case, if the logout post handler in tx thread context detects conn->tx_thread_active has already been cleared, simply return and exit in order for existing iscsit_close_connection() logic from rx thread context do failed logout cleanup. Reported-by:
Gary Guo <ghg@datera.io> Tested-by:
Chu Yuan Lin <cyl@datera.io> Signed-off-by:
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Nicholas Bellinger authored
This patch fixes a se_cmd->cmd_kref underflow during CMD_T_ABORTED when a fabric driver drops it's second reference from below the target_core_tmr.c based callers of transport_cmd_finish_abort(). Recently with the conversion of kref to refcount_t, this bug was manifesting itself as: [705519.601034] refcount_t: underflow; use-after-free. [705519.604034] INFO: NMI handler (kgdb_nmi_handler) took too long to run: 20116.512 msecs [705539.719111] ------------[ cut here ]------------ [705539.719117] WARNING: CPU: 3 PID: 26510 at lib/refcount.c:184 refcount_sub_and_test+0x33/0x51 Since the original kref atomic_t based kref_put() didn't check for underflow and only invoked the final callback when zero was reached, this bug did not manifest in practice since all se_cmd memory is using preallocated tags. To address this, go ahead and propigate the existing return from transport_put_cmd() up via transport_cmd_finish_abort(), and change transport_cmd_finish_abort() + core_tmr_handle_tas_abort() callers to only do their local target_put_sess_cmd() if necessary. Reported-by:
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