linux.git/drivers/target/target_core_device.c, branch v2.6.38

[SCSI] target: Remove procfs based target_core_mib.c code

2011-02-12T18:15:47+00:00

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 
Signed-off-by: James Bottomley

[SCSI] target: fixed missing lock drop in error path

2011-02-12T17:38:17+00:00

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 
Signed-off-by: Nicholas A. Bellinger 
Signed-off-by: James Bottomley

[SCSI] target: Fix demo-mode MappedLUN shutdown UA/PR breakage

2011-02-12T17:37:29+00:00

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:[]  [] __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]  [] ? __slab_free+0x89/0x11c
[  704.380403]  [] core_scsi3_free_all_registrations+0x3e/0x157 [target_core_mod]
[  704.380479]  [] se_release_device_for_hba+0xa6/0xd8 [target_core_mod]
[  704.380479]  [] se_free_virtual_device+0x3b/0x45 [target_core_mod]
[  704.383750]  [] target_core_drop_subdev+0x13a/0x18d [target_core_mod]
[  704.384068]  [] client_drop_item+0x25/0x31 [configfs]
[  704.384263]  [] configfs_rmdir+0x1a1/0x223 [configfs]
[  704.384459]  [] vfs_rmdir+0x7e/0xd3
[  704.384631]  [] do_rmdir+0xa3/0xf4
[  704.384895]  [] ? filp_close+0x67/0x72
[  704.386485]  [] sys_rmdir+0x11/0x13
[  704.387893]  [] 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  [] __core_scsi3_complete_pro_release+0x31/0x133 [target_core_mod]
[  704.389142]  RSP 
[  704.389572] ---[ end trace 2a3614f3cd6261a5 ]---

Signed-off-by: Nicholas A. Bellinger 
Signed-off-by: James Bottomley

[SCSI] target: Add LIO target core v4.0.0-rc6

2011-01-14T16:12:29+00:00

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 
Signed-off-by: James Bottomley