linux-toradex.git/drivers/target, branch v3.7 Linux kernel for Apalis and Colibri modules target: Fix handling of aborted commands 2012-11-17T21:35:44+00:00 Roland Dreier roland@purestorage.com 2012-11-16T16:06:16+00:00 3ea160b3e8f0de8161861995d9901f61192fc0b0 - If we stop processing an already-aborted command in target_execute_cmd(), then we need to complete t_transport_stop_comp to wake up the the TMR handling thread, or else it will end up waiting forever. - If we've a already sent an "aborted" status for a command in transport_check_aborted_status() then we should bail out of transport_send_task_abort() to avoid freeing the command twice. Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com> 
- If we stop processing an already-aborted command in
  target_execute_cmd(), then we need to complete t_transport_stop_comp
  to wake up the the TMR handling thread, or else it will end up
  waiting forever.

- If we've a already sent an "aborted" status for a command in
  transport_check_aborted_status() then we should bail out of
  transport_send_task_abort() to avoid freeing the command twice.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>
target: Fix incorrect usage of nested IRQ spinlocks in ABORT_TASK path 2012-11-01T07:38:45+00:00 Steve Hodgson steve@purestorage.com 2012-10-31T17:24:02+00:00 ab74b3d62f05192bf8fb8f169e7999d1183b2e08 This patch changes core_tmr_abort_task() to use spin_lock -> spin_unlock around se_cmd->t_state_lock while spin_lock_irqsave is held via se_sess->sess_cmd_lock. Signed-off-by: Steve Hodgson <steve@purestorage.com> Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> 
This patch changes core_tmr_abort_task() to use spin_lock -> spin_unlock
around se_cmd->t_state_lock while spin_lock_irqsave is held via
se_sess->sess_cmd_lock.

Signed-off-by: Steve Hodgson <steve@purestorage.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
iscsi-target: Fix missed wakeup race in TX thread 2012-11-01T07:38:44+00:00 Roland Dreier roland@purestorage.com 2012-10-31T16:16:46+00:00 d5627acba9ae584cf4928af19f7ddf5f6837de32 The sleeping code in iscsi_target_tx_thread() is susceptible to the classic missed wakeup race: - TX thread finishes handle_immediate_queue() and handle_response_queue(), thinks both queues are empty. - Another thread adds a queue entry and does wake_up_process(), which does nothing because the TX thread is still awake. - TX thread does schedule_timeout() and sleeps forever. In practice this can kill an iSCSI connection if for example an initiator does single-threaded writes and the target misses the wakeup window when queueing an R2T; in this case the connection will be stuck until the initiator loses patience and does some task management operation (or kills the connection entirely). Fix this by converting to wait_event_interruptible(), which does not suffer from this sort of race. Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: Andy Grover <agrover@redhat.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> 
The sleeping code in iscsi_target_tx_thread() is susceptible to the classic
missed wakeup race:

 - TX thread finishes handle_immediate_queue() and handle_response_queue(),
   thinks both queues are empty.
 - Another thread adds a queue entry and does wake_up_process(), which does
   nothing because the TX thread is still awake.
 - TX thread does schedule_timeout() and sleeps forever.

In practice this can kill an iSCSI connection if for example an initiator
does single-threaded writes and the target misses the wakeup window when
queueing an R2T; in this case the connection will be stuck until the
initiator loses patience and does some task management operation (or kills
the connection entirely).

Fix this by converting to wait_event_interruptible(), which does not
suffer from this sort of race.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: Andy Grover <agrover@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
target: Avoid integer overflow in se_dev_align_max_sectors() 2012-11-01T07:38:44+00:00 Roland Dreier roland@purestorage.com 2012-10-31T16:16:45+00:00 3e03989b5868acf69a391a424dc71fcd6cc48167 The expression (max_sectors * block_size) might overflow a u32 (indeed, since iblock sets max_hw_sectors to UINT_MAX, it is guaranteed to overflow and end up with a much-too-small result in many common cases). Fix this by doing an equivalent calculation that doesn't require multiplication. While we're touching this code, avoid splitting a printk format across two lines and use pr_info(...) instead of printk(KERN_INFO ...). Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> 
The expression (max_sectors * block_size) might overflow a u32
(indeed, since iblock sets max_hw_sectors to UINT_MAX, it is
guaranteed to overflow and end up with a much-too-small result in many
common cases).  Fix this by doing an equivalent calculation that
doesn't require multiplication.

While we're touching this code, avoid splitting a printk format across
two lines and use pr_info(...) instead of printk(KERN_INFO ...).

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
target: Don't return success from module_init() if setup fails 2012-11-01T07:38:31+00:00 Roland Dreier roland@purestorage.com 2012-10-31T16:16:44+00:00 0d0f9dfb31e0a6c92063e235417b42df185b3275 If the call to core_dev_release_virtual_lun0() fails, then nothing sets ret to anything other than 0, so even though everything is torn down and freed, target_core_init_configfs() will seem to succeed and the module will be loaded. Fix this by passing the return value on up the chain. Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> 
If the call to core_dev_release_virtual_lun0() fails, then nothing
sets ret to anything other than 0, so even though everything is
torn down and freed, target_core_init_configfs() will seem to succeed
and the module will be loaded.  Fix this by passing the return value
on up the chain.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
target: Re-add explict zeroing of INQUIRY bounce buffer memory 2012-11-01T05:17:12+00:00 Nicholas Bellinger nab@linux-iscsi.org 2012-11-01T05:04:26+00:00 dea5f0998aa82bdeca260b87c653db11e91329b2 This patch fixes a regression in spc_emulate_inquiry() code where the local scope bounce buffer was no longer getting it's memory zeroed, causing various problems with SCSI initiators that depend upon areas of INQUIRY EVPD=0x83 payload having been zeroed. This bug was introduced with the following v3.7-rc1 patch + CC'ed stable commit: commit ffe7b0e9326d9c68f5688bef691dd49f1e0d3651 Author: Paolo Bonzini <pbonzini@redhat.com> Date: Fri Sep 7 17:30:38 2012 +0200 target: support zero allocation length in INQUIRY Go ahead and re-add the missing memset of bounce buffer memory to be copied into the outgoing se_cmd descriptor kmapped SGL payload. Reported-by: Kelsey Prantis <kelsey.prantis@intel.com> Cc: Kelsey Prantis <kelsey.prantis@intel.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Andy Grover <agrover@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> 
This patch fixes a regression in spc_emulate_inquiry() code where the
local scope bounce buffer was no longer getting it's memory zeroed,
causing various problems with SCSI initiators that depend upon areas
of INQUIRY EVPD=0x83 payload having been zeroed.

This bug was introduced with the following v3.7-rc1 patch + CC'ed
stable commit:

commit ffe7b0e9326d9c68f5688bef691dd49f1e0d3651
Author: Paolo Bonzini <pbonzini@redhat.com>
Date:   Fri Sep 7 17:30:38 2012 +0200

    target: support zero allocation length in INQUIRY

Go ahead and re-add the missing memset of bounce buffer memory to be
copied into the outgoing se_cmd descriptor kmapped SGL payload.

Reported-by: Kelsey Prantis <kelsey.prantis@intel.com>
Cc: Kelsey Prantis <kelsey.prantis@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andy Grover <agrover@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
target: reintroduce some obsolete SCSI-2 commands 2012-10-26T23:49:40+00:00 Bernhard Kohl bernhard.kohl@nsn.com 2012-10-24T13:53:58+00:00 1a1ff38c4cebf23be8bf0009a76b082a13bd25cb With kernel 3.6 some obsolete SCSI-2 commands including SEEK_10 have have been removed by commit 1fd032ee10d2816c947f5d5b9abda95e728f0a8f "target: move code for CDB emulation". There are still clients out there which use these old SCSI-2 commands. This mainly happens when running VMs with legacy guest systems, connected via SCSI command pass-through to iSCSI targets. Make them happy and return status GOOD. Many real SCSI disks or external iSCSI storage devices still support these old commands. So let's make LIO backward compatible as well. This patch adds support for the previously removed SEEK_10 and additionally the SEEK_6 and REZERO_UNIT commands. Signed-off-by: Bernhard Kohl <bernhard.kohl@nsn.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> 
With kernel 3.6 some obsolete SCSI-2 commands including SEEK_10 have
have been removed by commit 1fd032ee10d2816c947f5d5b9abda95e728f0a8f
"target: move code for CDB emulation".

There are still clients out there which use these old SCSI-2 commands.
This mainly happens when running VMs with legacy guest systems,
connected via SCSI command pass-through to iSCSI targets. Make them
happy and return status GOOD.

Many real SCSI disks or external iSCSI storage devices still support
these old commands. So let's make LIO backward compatible as well.

This patch adds support for the previously removed SEEK_10 and
additionally the SEEK_6 and REZERO_UNIT commands.

Signed-off-by: Bernhard Kohl <bernhard.kohl@nsn.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
target: Fix double-free of se_cmd in target_complete_tmr_failure 2012-10-26T23:21:20+00:00 Nicholas Bellinger nab@linux-iscsi.org 2012-10-26T22:35:45+00:00 e13d5fef88c40b87c8430f8274c3a9ca32ef90bc Fabric drivers currently expect to internally release se_cmd in the event of a TMR failure during target_submit_tmr(), which means the immediate call to transport_generic_free_cmd() after TFO->queue_tm_rsp() from within target_complete_tmr_failure() workqueue context is wrong. This is done as some fabrics expect TMR operations to be acknowledged before releasing the descriptor, so the assumption that core is releasing se_cmd associated TMR memory is incorrect. This fixes a OOPs where transport_generic_free_cmd() was being called more than once. This bug was originally observed with tcm_qla2xxx fabric ports. Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Cc: Andy Grover <agrover@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> 
Fabric drivers currently expect to internally release se_cmd in the event
of a TMR failure during target_submit_tmr(), which means the immediate call
to transport_generic_free_cmd() after TFO->queue_tm_rsp() from within
target_complete_tmr_failure() workqueue context is wrong.

This is done as some fabrics expect TMR operations to be acknowledged
before releasing the descriptor, so the assumption that core is releasing
se_cmd associated TMR memory is incorrect.  This fixes a OOPs where
transport_generic_free_cmd() was being called more than once.

This bug was originally observed with tcm_qla2xxx fabric ports.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Andy Grover <agrover@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Merge branch 'for-3.7/core' of git://git.kernel.dk/linux-block 2012-10-11T00:04:23+00:00 Linus Torvalds torvalds@linux-foundation.org 2012-10-11T00:04:23+00:00 ce40be7a820bb393ac4ac69865f018d2f4038cf0 Pull block IO update from Jens Axboe: "Core block IO bits for 3.7. Not a huge round this time, it contains: - First series from Kent cleaning up and generalizing bio allocation and freeing. - WRITE_SAME support from Martin. - Mikulas patches to prevent O_DIRECT crashes when someone changes the block size of a device. - Make bio_split() work on data-less bio's (like trim/discards). - A few other minor fixups." Fixed up silent semantic mis-merge as per Mikulas Patocka and Andrew Morton. It is due to the VM no longer using a prio-tree (see commit 6b2dbba8b6ac: "mm: replace vma prio_tree with an interval tree"). So make set_blocksize() use mapping_mapped() instead of open-coding the internal VM knowledge that has changed. * 'for-3.7/core' of git://git.kernel.dk/linux-block: (26 commits) block: makes bio_split support bio without data scatterlist: refactor the sg_nents scatterlist: add sg_nents fs: fix include/percpu-rwsem.h export error percpu-rw-semaphore: fix documentation typos fs/block_dev.c:1644:5: sparse: symbol 'blkdev_mmap' was not declared blockdev: turn a rw semaphore into a percpu rw semaphore Fix a crash when block device is read and block size is changed at the same time block: fix request_queue->flags initialization block: lift the initial queue bypass mode on blk_register_queue() instead of blk_init_allocated_queue() block: ioctl to zero block ranges block: Make blkdev_issue_zeroout use WRITE SAME block: Implement support for WRITE SAME block: Consolidate command flag and queue limit checks for merges block: Clean up special command handling logic block/blk-tag.c: Remove useless kfree block: remove the duplicated setting for congestion_threshold block: reject invalid queue attribute values block: Add bio_clone_bioset(), bio_clone_kmalloc() block: Consolidate bio_alloc_bioset(), bio_kmalloc() ... 
Pull block IO update from Jens Axboe:
 "Core block IO bits for 3.7.  Not a huge round this time, it contains:

   - First series from Kent cleaning up and generalizing bio allocation
     and freeing.

   - WRITE_SAME support from Martin.

   - Mikulas patches to prevent O_DIRECT crashes when someone changes
     the block size of a device.

   - Make bio_split() work on data-less bio's (like trim/discards).

   - A few other minor fixups."

Fixed up silent semantic mis-merge as per Mikulas Patocka and Andrew
Morton.  It is due to the VM no longer using a prio-tree (see commit
6b2dbba8b6ac: "mm: replace vma prio_tree with an interval tree").

So make set_blocksize() use mapping_mapped() instead of open-coding the
internal VM knowledge that has changed.

* 'for-3.7/core' of git://git.kernel.dk/linux-block: (26 commits)
  block: makes bio_split support bio without data
  scatterlist: refactor the sg_nents
  scatterlist: add sg_nents
  fs: fix include/percpu-rwsem.h export error
  percpu-rw-semaphore: fix documentation typos
  fs/block_dev.c:1644:5: sparse: symbol 'blkdev_mmap' was not declared
  blockdev: turn a rw semaphore into a percpu rw semaphore
  Fix a crash when block device is read and block size is changed at the same time
  block: fix request_queue->flags initialization
  block: lift the initial queue bypass mode on blk_register_queue() instead of blk_init_allocated_queue()
  block: ioctl to zero block ranges
  block: Make blkdev_issue_zeroout use WRITE SAME
  block: Implement support for WRITE SAME
  block: Consolidate command flag and queue limit checks for merges
  block: Clean up special command handling logic
  block/blk-tag.c: Remove useless kfree
  block: remove the duplicated setting for congestion_threshold
  block: reject invalid queue attribute values
  block: Add bio_clone_bioset(), bio_clone_kmalloc()
  block: Consolidate bio_alloc_bioset(), bio_kmalloc()
  ...
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2012-10-10T10:52:19+00:00 Linus Torvalds torvalds@linux-foundation.org 2012-10-10T10:52:19+00:00 a188e7e93a36627fb3f0013f41857ab54f076d04 Pull scsi target updates from Nicholas Bellinger: "Things have been calm for the most part with no new fabric drivers in flight for v3.7 (we're up to eight now !), so this update is primarily focused on addressing a few long-standing items within target-core and iscsi-target fabric code. The highlights include: - target: Simplify fabric sense data length handling (roland) - qla2xxx: Fix endianness of task management response code (roland) - target: fix truncation of mode data, support zero allocation length (paolo) - target: Properly support zero-length commands in normal processing path (paolo) - iscsi-target: Correctly set 0xffffffff field within ISCSI_OP_REJECT PDU (ronnie + nab) - iscsi-target: Add explicit set of cache_dynamic_acls=1 for TPG demo-mode (ronnie + nab) - target/file: Re-enable optional fd_buffered_io=1 operation (nab + hch) - iscsi-target: Add MaxXmitDataSegmenthLength forr target -> initiator MDRSL declaration (nab) - target: Add target_submit_cmd_map_sgls for SGL fabric memory passthrough (nab + hch) - tcm_loop: Convert I/O path to use target_submit_cmd_map_sgls (hch + nab) - tcm_vhost: Convert I/O path to use target_submit_cmd_map_sgls (nab + hch) The last series for adding a new target_submit_cmd_map_sgls() fabric caller (as requested by hch) that accepts pre-allocated SGL memory (using existing logic), along with converting tcm_loop + tcm_vhost has only been in -next for the last days, but has gotten enough review +testing and is clear enough a mechanical change that I think it's reasonable to merge for -rc1 code. Thanks again to everyone who contributed this round! Extra special thanks to Roland (PureStorage) for tracking down the qla2xxx target TMR response code endian issue, and to Paolo (Redhat) for resolving the long standing zero-length CDB issues within target-core between virtual and pSCSI backends." * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (44 commits) iscsi-target: Bump defaults for nopin_timeout + nopin_response_timeout values iscsit: proper endianess conversions iscsit: use the itt_t abstract type iscsit: add missing endianess conversion in iscsit_check_inaddr_any iscsit: remove incorrect unlock in iscsit_build_sendtargets_resp iscsit: mark various functions static target/iscsi: precedence bug in iscsit_set_dataout_sequence_values() target/usb-gadget: strlen() doesn't count the terminator target/usb-gadget: remove duplicate initialization tcm_vhost: Convert I/O path to use target_submit_cmd_map_sgls target: Add control CDB READ payload zero work-around tcm_loop: Convert I/O path to use target_submit_cmd_map_sgls target: Add target_submit_cmd_map_sgls for SGL fabric memory passthrough iscsi-target: Add explicit set of cache_dynamic_acls=1 for TPG demo-mode iscsi-target: Change iscsi_target_seq_pdu_list.c to honor MaxXmitDataSegmentLength iscsi-target: Add MaxXmitDataSegmentLength connection recovery check iscsi-target: Convert incoming PDU payload checks to MaxXmitDataSegmentLength iscsi-target: Enable MaxXmitDataSegmentLength operation in login path iscsi-target: Add base MaxXmitDataSegmentLength code target/file: Re-enable optional fd_buffered_io=1 operation ... 
Pull scsi target updates from Nicholas Bellinger:
 "Things have been calm for the most part with no new fabric drivers in
  flight for v3.7 (we're up to eight now !), so this update is primarily
  focused on addressing a few long-standing items within target-core and
  iscsi-target fabric code.

  The highlights include:

   - target: Simplify fabric sense data length handling (roland)
   - qla2xxx: Fix endianness of task management response code (roland)
   - target: fix truncation of mode data, support zero allocation length
     (paolo)
   - target: Properly support zero-length commands in normal processing
     path (paolo)
   - iscsi-target: Correctly set 0xffffffff field within ISCSI_OP_REJECT
     PDU (ronnie + nab)
   - iscsi-target: Add explicit set of cache_dynamic_acls=1 for TPG
     demo-mode (ronnie + nab)
   - target/file: Re-enable optional fd_buffered_io=1 operation (nab +
     hch)
   - iscsi-target: Add MaxXmitDataSegmenthLength forr target ->
     initiator MDRSL declaration (nab)
   - target: Add target_submit_cmd_map_sgls for SGL fabric memory
     passthrough (nab + hch)
   - tcm_loop: Convert I/O path to use target_submit_cmd_map_sgls (hch +
     nab)
   - tcm_vhost: Convert I/O path to use target_submit_cmd_map_sgls (nab
     + hch)

  The last series for adding a new target_submit_cmd_map_sgls() fabric
  caller (as requested by hch) that accepts pre-allocated SGL memory
  (using existing logic), along with converting tcm_loop + tcm_vhost has
  only been in -next for the last days, but has gotten enough review
  +testing and is clear enough a mechanical change that I think it's
  reasonable to merge for -rc1 code.

  Thanks again to everyone who contributed this round! Extra special
  thanks to Roland (PureStorage) for tracking down the qla2xxx target
  TMR response code endian issue, and to Paolo (Redhat) for resolving
  the long standing zero-length CDB issues within target-core between
  virtual and pSCSI backends."

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (44 commits)
  iscsi-target: Bump defaults for nopin_timeout + nopin_response_timeout values
  iscsit: proper endianess conversions
  iscsit: use the itt_t abstract type
  iscsit: add missing endianess conversion in iscsit_check_inaddr_any
  iscsit: remove incorrect unlock in iscsit_build_sendtargets_resp
  iscsit: mark various functions static
  target/iscsi: precedence bug in iscsit_set_dataout_sequence_values()
  target/usb-gadget: strlen() doesn't count the terminator
  target/usb-gadget: remove duplicate initialization
  tcm_vhost: Convert I/O path to use target_submit_cmd_map_sgls
  target: Add control CDB READ payload zero work-around
  tcm_loop: Convert I/O path to use target_submit_cmd_map_sgls
  target: Add target_submit_cmd_map_sgls for SGL fabric memory passthrough
  iscsi-target: Add explicit set of cache_dynamic_acls=1 for TPG demo-mode
  iscsi-target: Change iscsi_target_seq_pdu_list.c to honor MaxXmitDataSegmentLength
  iscsi-target: Add MaxXmitDataSegmentLength connection recovery check
  iscsi-target: Convert incoming PDU payload checks to MaxXmitDataSegmentLength
  iscsi-target: Enable MaxXmitDataSegmentLength operation in login path
  iscsi-target: Add base MaxXmitDataSegmentLength code
  target/file: Re-enable optional fd_buffered_io=1 operation
  ...