linux.git/block, branch v3.1-rc2

fault-injection: add ability to export fault_attr in arbitrary directory

2011-08-04T00:25:20+00:00

init_fault_attr_dentries() is used to export fault_attr via debugfs.
But it can only export it in debugfs root directory.

Per Forlin is working on mmc_fail_request which adds support to inject
data errors after a completed host transfer in MMC subsystem.

The fault_attr for mmc_fail_request should be defined per mmc host and
export it in debugfs directory per mmc host like
/sys/kernel/debug/mmc0/mmc_fail_request.

init_fault_attr_dentries() doesn't help for mmc_fail_request.  So this
introduces fault_create_debugfs_attr() which is able to create a
directory in the arbitrary directory and replace
init_fault_attr_dentries().

[akpm@linux-foundation.org: extraneous semicolon, per Randy]
Signed-off-by: Akinobu Mita 
Tested-by: Per Forlin 
Cc: Jens Axboe 
Cc: Christoph Lameter 
Cc: Pekka Enberg 
Cc: Matt Mackall 
Cc: Randy Dunlap 
Cc: Stephen Rothwell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fail_make_request: cleanup should_fail_request

2011-07-26T23:49:46+00:00

This changes should_fail_request() to more usable wrapper function of
should_fail().  It can avoid putting #ifdef CONFIG_FAIL_MAKE_REQUEST in
the middle of a function.

Signed-off-by: Akinobu Mita 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

block: fix warning with calling smp_processor_id() in preemptible section

2011-07-26T13:01:15+00:00

After commit 5757a6d7 introduced an unsafe calling of
smp_processor_id(), with preempt debuggin turned on we spew a lot of:

BUG: using smp_processor_id() in preemptible [00000000] code: kjournald/514
caller is __make_request+0x1b8/0x308
[] (unwind_backtrace+0x0/0xe8) from [] (debug_smp_processor_id+0xbc/0xf0)
[] (debug_smp_processor_id+0xbc/0xf0) from [] (__make_request+0x1b8/0x308)
[] (__make_request+0x1b8/0x308) from [] (generic_make_request+0x4dc/0x558)
[] (generic_make_request+0x4dc/0x558) from [] (submit_bio+0x114/0x138)
[] (submit_bio+0x114/0x138) from [] (submit_bh+0x148/0x16c)
[] (submit_bh+0x148/0x16c) from [] (__sync_dirty_buffer+0x88/0xd8)
[] (__sync_dirty_buffer+0x88/0xd8) from [] (journal_commit_transaction+0x1198/0x1688)
[] (journal_commit_transaction+0x1198/0x1688) from [] (kjournald+0xb4/0x224)
[] (kjournald+0xb4/0x224) from [] (kthread+0x8c/0x94)
[] (kthread+0x8c/0x94) from [] (kernel_thread_exit+0x0/0x8)

Fix this by just using raw_smp_processor_id(), it's just a hint
after all. There's no pinning of the CPU or accessing per-cpu
structures involved.

Reported-by: Ming Lei 
Signed-off-by: Jens Axboe

Merge branch 'for-3.1/drivers' of git://git.kernel.dk/linux-block

2011-07-25T17:38:18+00:00

* 'for-3.1/drivers' of git://git.kernel.dk/linux-block:
  cciss: do not attempt to read from a write-only register
  xen/blkback: Add module alias for autoloading
  xen/blkback: Don't let in-flight requests defer pending ones.
  bsg: fix address space warning from sparse
  bsg: remove unnecessary conditional expressions
  bsg: fix bsg_poll() to return POLLOUT properly

Merge branch 'for-3.1/core' of git://git.kernel.dk/linux-block

2011-07-25T17:33:36+00:00

* 'for-3.1/core' of git://git.kernel.dk/linux-block: (24 commits)
  block: strict rq_affinity
  backing-dev: use synchronize_rcu_expedited instead of synchronize_rcu
  block: fix patch import error in max_discard_sectors check
  block: reorder request_queue to remove 64 bit alignment padding
  CFQ: add think time check for group
  CFQ: add think time check for service tree
  CFQ: move think time check variables to a separate struct
  fixlet: Remove fs_excl from struct task.
  cfq: Remove special treatment for metadata rqs.
  block: document blk_plug list access
  block: avoid building too big plug list
  compat_ioctl: fix make headers_check regression
  block: eliminate potential for infinite loop in blkdev_issue_discard
  compat_ioctl: fix warning caused by qemu
  block: flush MEDIA_CHANGE from drivers on close(2)
  blk-throttle: Make total_nr_queued unsigned
  block: Add __attribute__((format(printf...) and fix fallout
  fs/partitions/check.c: make local symbols static
  block:remove some spare spaces in genhd.c
  block:fix the comment error in blkdev.h
  ...

block: strict rq_affinity

2011-07-23T18:44:25+00:00

Some systems benefit from completions always being steered to the strict
requester cpu rather than the looser "per-socket" steering that
blk_cpu_to_group() attempts by default. This is because the first
CPU in the group mask ends up being completely overloaded with work,
while the others (including the original submitter) has power left
to spare.

Allow the strict mode to be set by writing '2' to the sysfs control
file. This is identical to the scheme used for the nomerges file,
where '2' is a more aggressive setting than just being turned on.

echo 2 > /sys/block//queue/rq_affinity

Cc: Christoph Hellwig 
Cc: Roland Dreier 
Tested-by: Dave Jiang 
Signed-off-by: Dan Williams 
Signed-off-by: Jens Axboe

block: fix patch import error in max_discard_sectors check

2011-07-23T18:34:59+00:00

A '!' snuck in before the unlikely, rendering it useless.

Reported-by: Mike Snitzer 
Signed-off-by: Jens Axboe

Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6

2011-07-23T18:13:11+00:00

* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (77 commits)
  [SCSI] fix crash in scsi_dispatch_cmd()
  [SCSI] sr: check_events() ignore GET_EVENT when TUR says otherwise
  [SCSI] bnx2i: Fixed kernel panic due to illegal usage of sc->request->cpu
  [SCSI] bfa: Update the driver version to 3.0.2.1
  [SCSI] bfa: Driver and BSG enhancements.
  [SCSI] bfa: Added support to query PHY.
  [SCSI] bfa: Added HBA diagnostics support.
  [SCSI] bfa: Added support for flash configuration
  [SCSI] bfa: Added support to obtain SFP info.
  [SCSI] bfa: Added support for CEE info and stats query.
  [SCSI] bfa: Extend BSG interface.
  [SCSI] bfa: FCS bug fixes.
  [SCSI] bfa: DMA memory allocation enhancement.
  [SCSI] bfa: Brocade-1860 Fabric Adapter vHBA support.
  [SCSI] bfa: Brocade-1860 Fabric Adapter PLL init fixes.
  [SCSI] bfa: Added Fabric Assigned Address(FAA) support
  [SCSI] bfa: IOC bug fixes.
  [SCSI] bfa: Enable ASIC block configuration and query.
  [SCSI] bnx2i: Updated copyright and bump version
  [SCSI] bnx2i: Modified to skip CNIC registration if iSCSI is not supported
  ...

Fix up some trivial conflicts in:
 - drivers/scsi/bnx2fc/{bnx2fc.h,bnx2fc_fcoe.c}:
	Crazy broadcom version number conflicts
 - drivers/target/tcm_fc/tfc_cmd.c
	Just trivial cleanups done on adjacent lines

[SCSI] fix crash in scsi_dispatch_cmd()

2011-07-21T21:21:18+00:00

USB surprise removal of sr is triggering an oops in
scsi_dispatch_command().  What seems to be happening is that USB is
hanging on to a queue reference until the last close of the upper
device, so the crash is caused by surprise remove of a mounted CD
followed by attempted unmount.

The problem is that USB doesn't issue its final commands as part of
the SCSI teardown path, but on last close when the block queue is long
gone.  The long term fix is probably to make sr do the teardown in the
same way as sd (so remove all the lower bits on ejection, but keep the
upper disk alive until last close of user space).  However, the
current oops can be simply fixed by not allowing any commands to be
sent to a dead queue.

Cc: stable@kernel.org
Signed-off-by: James Bottomley

block,rcu: Convert call_rcu(disk_free_ptbl_rcu_cb) to kfree_rcu()

2011-07-20T21:10:13+00:00

The rcu callback disk_free_ptbl_rcu_cb() just calls a kfree(),
so we use kfree_rcu() instead of the call_rcu(disk_free_ptbl_rcu_cb).

Signed-off-by: Lai Jiangshan 
Signed-off-by: Paul E. McKenney 
Cc: Jens Axboe 
Reviewed-by: Josh Triplett