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2011-03-23target: Fix volume size misreporting for volumes > 2TBNicholas Bellinger
commit 904f0bc482201fa86e75c330d79dfd11be494cf8 upstream. the target infrastructure fails to send the correct conventional size to READ_CAPACITY that force a retry with READ_CAPACITY_16, which reads the capacity for devices > 2TB. Fix by adding the correct return to trigger RC(16). Reported-by: Ben Jarvis <bjarvismn@gmail.com> Signed-off-by: Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-02-28[SCSI] target: Fix t_transport_aborted handling in LUN_RESET + active I/O ↵Nicholas Bellinger
shutdown This patch addresses two outstanding bugs related to T_TASK(cmd)->t_transport_aborted handling during TMR LUN_RESET and active I/O shutdown. This first involves adding two explict t_transport_aborted=1 assignments in core_tmr_lun_reset() in order to signal the task has been aborted, and updating transport_generic_wait_for_tasks() to skip sleeping when t_transport_aborted=1 has been set. This fixes an issue where transport_generic_wait_for_tasks() would end up sleeping indefinately when called from fabric module context while TMR LUN_RESET was happening with long outstanding backend struct se_task not yet being completed. The second adds a missing call to transport_remove_task_from_execute_queue() when task->task_execute_queue=1 is set in order to fix an OOPs when task->t_execute_list has not been dropped. It also fixes the same case in transport_processing_shutdown() to prevent the issue from happening during active I/O struct se_device shutdown. Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12[SCSI] target: fix use after free detected by SLUB poisonNicholas Bellinger
This patch moves a large number of memory release paths inside of the configfs callback target_core_hba_item_ops->release() called from within fs/configfs/item.c: config_item_cleanup() context. This patch resolves the SLUB 'Poison overwritten' warnings. Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12[SCSI] target: Remove procfs based target_core_mib.c codeNicholas Bellinger
This patch removes the legacy procfs based target_core_mib.c code, and moves the necessary scsi_index_tables functions and defines into target_core_transport.c and target_core_base.h code to allow existing fabric independent statistics to function. This includes the removal of a handful of 'atomic_t mib_ref_count' counters used in struct se_node_acl, se_session and se_hba to prevent removal while using seq_list procfs walking logic. [jejb: fix up compile failures] Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12[SCSI] target: Fix SCF_SCSI_CONTROL_SG_IO_CDB breakageNicholas Bellinger
This patch fixes a bug introduced during the v4 control CDB emulation refactoring that broke SCF_SCSI_CONTROL_SG_IO_CDB operation within transport_map_control_cmd_to_task(). It moves the BUG_ON() into transport_do_se_mem_map() after the TRANSPORT(dev)->do_se_mem_map() RAMDISK_DR special case, and adds the proper struct se_mem assignment when !list_empty() for normal non RAMDISK_DR backend device cases. Reported-by: Kai-Thorsten Hambrecht <kai@hambrecht.org> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12[SCSI] target: Fix top-level configfs_subsystem default_group shutdown breakageNicholas Bellinger
This patch fixes two bugs uncovered during testing with slub_debug=FPUZ during module_exit() -> target_core_exit_configfs() with release of configfs subsystem consumer default groups, namely how this should be working with fs/configfs/dir.c:configfs_unregister_subsystem() release logic for struct config_group->default_group. The first issue involves configfs_unregister_subsystem() expecting to walk+drain the top-level subsys->su_group.default_groups directly in unlink_group(), and not directly from the configfs subsystem consumer for the top level struct config_group->default_groups. This patch drops the walk+drain of subsys->su_group.default_groups from TCM configfs subsystem consumer code, and moves the top-level ->default_groups kfree() after configfs_unregister_subsystem() has been called. The second issue involves calling core_alua_free_lu_gp(se_global->default_lu_gp) to release the default_lu_gp->lu_gp_group before configfs_unregister_subsystem() has been called. This patches also moves the core_alua_free_lu_gp() call to release default_lu_group->lu_gp_group after the subsys has been unregistered. Finally, this patch explictly clears the [lu_gp,alua,hba]_cg->default_groups pointers after kfree() to ensure that no stale memory is picked up from child struct config_group->default_group[] while configfs_unregister_subsystem() is called. Reported-by: Fubo Chen <fubo.chen@gmail.com> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12[SCSI] target: fixed missing lock drop in error pathFubo Chen
The struct se_node_acl->device_list_lock needs to be released if either sanity check for struct se_dev_entry->se_lun_acl or deve->se_lun fails. Signed-off-by: Fubo Chen <fubo.chen@gmail.com> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12[SCSI] target: Fix demo-mode MappedLUN shutdown UA/PR breakageNicholas Bellinger
This patch fixes a bug in core_update_device_list_for_node() where individual demo-mode generated MappedLUN's UA + Persistent Reservations metadata where being leaked, instead of falling through and calling existing core_scsi3_ua_release_all() and core_scsi3_free_pr_reg_from_nacl() at the end of core_update_device_list_for_node(). This bug would manifest itself with the following OOPs w/ TPG demo-mode endpoints (tfo->tpg_check_demo_mode()=1), and PROUT REGISTER+RESERVE -> explict struct se_session logout -> struct se_device shutdown: [ 697.021139] LIO_iblock used greatest stack depth: 2704 bytes left [ 702.235017] general protection fault: 0000 [#1] SMP [ 702.235074] last sysfs file: /sys/devices/virtual/net/lo/operstate [ 704.372695] CPU 0 [ 704.372725] Modules linked in: crc32c target_core_stgt scsi_tgt target_core_pscsi target_core_file target_core_iblock target_core_mod configfs sr_mod cdrom sd_mod ata_piix mptspi mptscsih libata mptbase [last unloaded: iscsi_target_mod] [ 704.375442] [ 704.375563] Pid: 4964, comm: tcm_node Not tainted 2.6.37+ #1 440BX Desktop Reference Platform/VMware Virtual Platform [ 704.375912] RIP: 0010:[<ffffffffa00aaa16>] [<ffffffffa00aaa16>] __core_scsi3_complete_pro_release+0x31/0x133 [target_core_mod] [ 704.376017] RSP: 0018:ffff88001e5ffcb8 EFLAGS: 00010296 [ 704.376017] RAX: 6d32335b1b0a0d0a RBX: ffff88001d952cb0 RCX: 0000000000000015 [ 704.376017] RDX: ffff88001b428000 RSI: ffff88001da5a4c0 RDI: ffff88001e5ffcd8 [ 704.376017] RBP: ffff88001e5ffd28 R08: ffff88001e5ffcd8 R09: ffff88001d952080 [ 704.377116] R10: ffff88001dfc5480 R11: ffff88001df8abb0 R12: ffff88001d952cb0 [ 704.377319] R13: 0000000000000000 R14: ffff88001df8abb0 R15: ffff88001b428000 [ 704.377521] FS: 00007f033d15c6e0(0000) GS:ffff88001fa00000(0000) knlGS:0000000000000000 [ 704.377861] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 704.378043] CR2: 00007fff09281510 CR3: 000000001e5db000 CR4: 00000000000006f0 [ 704.378110] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 704.378110] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 704.378110] Process tcm_node (pid: 4964, threadinfo ffff88001e5fe000, task ffff88001d99c260) [ 704.378110] Stack: [ 704.378110] ffffea0000678980 ffff88001da5a4c0 ffffea0000678980 ffff88001f402b00 [ 704.378110] ffff88001e5ffd08 ffffffff810ea236 ffff88001e5ffd18 0000000000000282 [ 704.379772] ffff88001d952080 ffff88001d952cb0 ffff88001d952cb0 ffff88001dc79010 [ 704.380082] Call Trace: [ 704.380220] [<ffffffff810ea236>] ? __slab_free+0x89/0x11c [ 704.380403] [<ffffffffa00ab781>] core_scsi3_free_all_registrations+0x3e/0x157 [target_core_mod] [ 704.380479] [<ffffffffa00a752b>] se_release_device_for_hba+0xa6/0xd8 [target_core_mod] [ 704.380479] [<ffffffffa00a7598>] se_free_virtual_device+0x3b/0x45 [target_core_mod] [ 704.383750] [<ffffffffa00a3177>] target_core_drop_subdev+0x13a/0x18d [target_core_mod] [ 704.384068] [<ffffffffa00960db>] client_drop_item+0x25/0x31 [configfs] [ 704.384263] [<ffffffffa00967b5>] configfs_rmdir+0x1a1/0x223 [configfs] [ 704.384459] [<ffffffff810fa8cd>] vfs_rmdir+0x7e/0xd3 [ 704.384631] [<ffffffff810fc3be>] do_rmdir+0xa3/0xf4 [ 704.384895] [<ffffffff810eed15>] ? filp_close+0x67/0x72 [ 704.386485] [<ffffffff810fc446>] sys_rmdir+0x11/0x13 [ 704.387893] [<ffffffff81002a92>] system_call_fastpath+0x16/0x1b [ 704.388083] Code: 4c 8d 45 b0 41 56 49 89 d7 41 55 41 89 cd 41 54 b9 15 00 00 00 53 48 89 fb 48 83 ec 48 4c 89 c7 48 89 75 98 48 8b 86 28 01 00 00 <48> 8b 80 90 01 00 00 48 89 45 a0 31 c0 f3 aa c7 45 ac 00 00 00 [ 704.388763] RIP [<ffffffffa00aaa16>] __core_scsi3_complete_pro_release+0x31/0x133 [target_core_mod] [ 704.389142] RSP <ffff88001e5ffcb8> [ 704.389572] ---[ end trace 2a3614f3cd6261a5 ]--- Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12[SCSI] target/iblock: Fix failed bd claim NULL pointer dereferenceNicholas Bellinger
This patch adds an explict check for struct iblock_dev->ibd_bd in iblock_free_device() before calling blkdev_put(), which will otherwise hit the following NULL pointer dereference @ ib_dev->ibd_bd when iblock_create_virtdevice() fails to claim an already in-use struct block_device via blkdev_get_by_path(). [ 112.528578] Target_Core_ConfigFS: Allocated struct se_subsystem_dev: ffff88001e750000 se_dev_su_ptr: ffff88001dd05d70 [ 112.534681] Target_Core_ConfigFS: Calling t->free_device() for se_dev_su_ptr: ffff88001dd05d70 [ 112.535029] BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 [ 112.535029] IP: [<ffffffff814987a3>] mutex_lock+0x14/0x35 [ 112.535029] PGD 1e5d0067 PUD 1e274067 PMD 0 [ 112.535029] Oops: 0002 [#1] SMP [ 112.535029] last sysfs file: /sys/devices/pci0000:00/0000:00:07.1/host2/target2:0:0/2:0:0:0/type [ 112.535029] CPU 0 [ 112.535029] Modules linked in: iscsi_target_mod target_core_stgt scsi_tgt target_core_pscsi target_core_file target_core_iblock target_core_mod configfs sr_mod cdrom sd_mod ata_piix mptspi mptscsih libata mptbase [last unloaded: scsi_wait_scan] [ 112.535029] [ 112.535029] Pid: 3345, comm: python2.5 Not tainted 2.6.37+ #1 440BX Desktop Reference Platform/VMware Virtual Platform [ 112.535029] RIP: 0010:[<ffffffff814987a3>] [<ffffffff814987a3>] mutex_lock+0x14/0x35 [ 112.535029] RSP: 0018:ffff88001e6d7d58 EFLAGS: 00010246 [ 112.535029] RAX: 0000000000000000 RBX: 0000000000000020 RCX: 0000000000000082 [ 112.535029] RDX: ffff88001e6d7fd8 RSI: 0000000000000083 RDI: 0000000000000020 [ 112.535029] RBP: ffff88001e6d7d68 R08: 0000000000000000 R09: 0000000000000000 [ 112.535029] R10: ffff8800000be860 R11: ffff88001f420000 R12: 0000000000000020 [ 112.535029] R13: 0000000000000083 R14: ffff88001d809430 R15: ffff88001d8094f8 [ 112.535029] FS: 00007ff17ca7d6e0(0000) GS:ffff88001fa00000(0000) knlGS:0000000000000000 [ 112.535029] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 112.535029] CR2: 0000000000000020 CR3: 000000001e5d2000 CR4: 00000000000006f0 [ 112.535029] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 112.535029] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 112.535029] Process python2.5 (pid: 3345, threadinfo ffff88001e6d6000, task ffff88001e2d0760) [ 112.535029] Stack: [ 112.535029] ffff88001e6d7d88 0000000000000000 ffff88001e6d7d98 ffffffff811187fc [ 112.535029] ffff88001d809430 ffff88001dd05d70 ffff88001e750860 ffff88001e750000 [ 112.535029] ffff88001e6d7db8 ffffffffa00e3757 ffff88001e6d7db8 0000000000000004 [ 112.535029] Call Trace: [ 112.535029] [<ffffffff811187fc>] blkdev_put+0x28/0x107 [ 112.535029] [<ffffffffa00e3757>] iblock_free_device+0x1d/0x36 [target_core_iblock] [ 112.535029] [<ffffffffa00a319c>] target_core_drop_subdev+0x15f/0x18d [target_core_mod] [ 112.535029] [<ffffffffa00960db>] client_drop_item+0x25/0x31 [configfs] [ 112.535029] [<ffffffffa00967b5>] configfs_rmdir+0x1a1/0x223 [configfs] [ 112.535029] [<ffffffff810fa8cd>] vfs_rmdir+0x7e/0xd3 [ 112.535029] [<ffffffff810fc3be>] do_rmdir+0xa3/0xf4 [ 112.535029] [<ffffffff810fc446>] sys_rmdir+0x11/0x13 [ 112.535029] [<ffffffff81002a92>] system_call_fastpath+0x16/0x1b [ 112.535029] Code: 8b 04 25 88 b5 00 00 48 2d d8 1f 00 00 48 89 43 18 31 c0 5e 5b c9 c3 55 48 89 e5 53 48 89 fb 48 83 ec 08 e8 c4 f7 ff ff 48 89 df <3e> ff 0f 79 05 e8 1e ff ff ff 65 48 8b 04 25 88 b5 00 00 48 2d [ 112.535029] RIP [<ffffffff814987a3>] mutex_lock+0x14/0x35 [ 112.535029] RSP <ffff88001e6d7d58> [ 112.535029] CR2: 0000000000000020 [ 132.679636] ---[ end trace 05754bb48eb828f0 ]--- Note it also adds an second explict check for ib_dev->ibd_bio_set before calling bioset_free() to fix the same possible NULL pointer deference during an early iblock_create_virtdevice() failure. Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12[SCSI] target: iblock/pscsi claim checking for NULL instead of IS_ERRDan Carpenter
blkdev_get_by_path() returns an ERR_PTR() or error and it doesn't return a NULL. It looks like this bug would be easy to trigger by mistake. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-01-14[SCSI] target: Add LIO target core v4.0.0-rc6Nicholas Bellinger
LIO target is a full featured in-kernel target framework with the following feature set: High-performance, non-blocking, multithreaded architecture with SIMD support. Advanced SCSI feature set: * Persistent Reservations (PRs) * Asymmetric Logical Unit Assignment (ALUA) * Protocol and intra-nexus multiplexing, load-balancing and failover (MC/S) * Full Error Recovery (ERL=0,1,2) * Active/active task migration and session continuation (ERL=2) * Thin LUN provisioning (UNMAP and WRITE_SAMExx) Multiprotocol target plugins Storage media independence: * Virtualization of all storage media; transparent mapping of IO to LUNs * No hard limits on number of LUNs per Target; maximum LUN size ~750 TB * Backstores: SATA, SAS, SCSI, BluRay, DVD, FLASH, USB, ramdisk, etc. Standards compliance: * Full compliance with IETF (RFC 3720) * Full implementation of SPC-4 PRs and ALUA Significant code cleanups done by Christoph Hellwig. [jejb: fix up for new block bdev exclusive interface. Minor fixes from Randy Dunlap and Dan Carpenter.] Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>