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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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