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The XFS_IOC_FSGETXATTR ioctl allows unprivileged users to read 12
bytes of uninitialized stack memory, because the fsxattr struct
declared on the stack in xfs_ioc_fsgetxattr() does not alter (or zero)
the 12-byte fsx_pad member before copying it back to the user. This
patch takes care of it.
Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
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A real life genuine preemption leak..
Reported-and-tested-by: Jeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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An execve with a very large total of argument/environment strings
can take a really long time in the execve system call. It runs
uninterruptibly to count and copy all the strings. This change
makes it abort the exec quickly if sent a SIGKILL.
Note that this is the conservative change, to interrupt only for
SIGKILL, by using fatal_signal_pending(). It would be perfectly
correct semantics to let any signal interrupt the string-copying in
execve, i.e. use signal_pending() instead of fatal_signal_pending().
We'll save that change for later, since it could have user-visible
consequences, such as having a timer set too quickly make it so that
an execve can never complete, though it always happened to work before.
Signed-off-by: Roland McGrath <roland@redhat.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This adds a preemption point during the copying of the argument and
environment strings for execve, in copy_strings(). There is already
a preemption point in the count() loop, so this doesn't add any new
points in the abstract sense.
When the total argument+environment strings are very large, the time
spent copying them can be much more than a normal user time slice.
So this change improves the interactivity of the rest of the system
when one process is doing an execve with very large arguments.
Signed-off-by: Roland McGrath <roland@redhat.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The CONFIG_STACK_GROWSDOWN variant of setup_arg_pages() does not
check the size of the argument/environment area on the stack.
When it is unworkably large, shift_arg_pages() hits its BUG_ON.
This is exploitable with a very large RLIMIT_STACK limit, to
create a crash pretty easily.
Check that the initial stack is not too large to make it possible
to map in any executable. We're not checking that the actual
executable (or intepreter, for binfmt_elf) will fit. So those
mappings might clobber part of the initial stack mapping. But
that is just userland lossage that userland made happen, not a
kernel problem.
Signed-off-by: Roland McGrath <roland@redhat.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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* 'kvm-updates/2.6.36' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: x86: Perform hardware_enable in CPU_STARTING callback
KVM: i8259: fix migration
KVM: fix i8259 oops when no vcpus are online
KVM: x86 emulator: fix regression with cmpxchg8b on i386 hosts
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The CPU_STARTING callback was added upstream with the intention
of being used for KVM, specifically for the hardware enablement
that must be done before we can run in hardware virt. It had
bugs on the x86_64 architecture at the time, where it was called
after CPU_ONLINE. The arches have since merged and the bug is
gone.
It might be noted other features should probably start making
use of this callback; microcode updates in particular which
might be fixing important erratums would be best applied before
beginning to run user tasks.
Signed-off-by: Zachary Amsden <zamsden@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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Top of kvm_kpic_state structure should have the same memory layout as
kvm_pic_state since it is copied by memcpy.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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If there are no vcpus, found will be NULL. Check before doing anything with
it.
Signed-off-by: Avi Kivity <avi@redhat.com>
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operand::val and operand::orig_val are 32-bit on i386, whereas cmpxchg8b
operands are 64-bit.
Fix by adding val64 and orig_val64 union members to struct operand, and
using them where needed.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
tracing: t_start: reset FTRACE_ITER_HASH in case of seek/pread
perf symbols: Fix multiple initialization of symbol system
perf: Fix CPU hotplug
perf, trace: Fix module leak
tracing/kprobe: Fix handling of C-unlike argument names
tracing/kprobes: Fix handling of argument names
perf probe: Fix handling of arguments names
perf probe: Fix return probe support
tracing/kprobe: Fix a memory leak in error case
tracing: Do not allow llseek to set_ftrace_filter
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git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into perf/urgent
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Be sure to avoid entering t_show() with FTRACE_ITER_HASH set without
having properly started the iterator to iterate the hash. This case is
degenerate and, as discovered by Robert Swiecki, can cause t_hash_show()
to misuse a pointer. This causes a NULL ptr deref with possible security
implications. Tracked as CVE-2010-3079.
Cc: Robert Swiecki <swiecki@google.com>
Cc: Eugene Teo <eugene@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux-2.6 into perf/urgent
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By returning immediately if it was already initialized, do it as well at
symbol__exit, refusing multiple deinitializations.
This fixes problems in the kmem, sched and timechart commands.
Reported-by: Davidlohr Bueso <dave@gnu.org>
Cc: Davidlohr Bueso <dave@gnu.org>
Signed-off-by: Jovi Zhang <bookjovi@gmail.com>
LKML-Reference: AANLkTi=9Cn=R8SPMCRp5z+gEjXbaBHeb-AaOtRbuwwcn@mail.gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Since we have UP_PREPARE, we should also have UP_CANCELED.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: paulus <paulus@samba.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Commit 1c024eca (perf, trace: Optimize tracepoints by using
per-tracepoint-per-cpu hlist to track events) caused a module
refcount leak.
Reported-And-Tested-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4C7E1F12.8030304@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Check the argument name whether it is invalid (not C-like symbol name). This
makes event format simple.
Reported-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
LKML-Reference: <20100827113912.22882.62313.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Set "argN" name for each argument automatically if it has no specified name.
Since dynamic trace event(kprobe_events) accepts special characters for its
argument, its format can show those special characters (e.g. '$', '%', '+').
However, perf can't parse those format because of the character (especially
'%') mess up the format. This sets "argX" name for those arguments if user
omitted the argument names.
E.g.
# echo 'p do_fork %ax IP=%ip $stack' > tracing/kprobe_events
# cat tracing/kprobe_events
p:kprobes/p_do_fork_0 do_fork arg1=%ax IP=%ip arg3=$stack
Reported-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
LKML-Reference: <20100827113906.22882.59312.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Don't make argument names from raw parameters (means the parameters are written
in kprobe-tracer syntax), because the argument syntax may include special
characters. Just leave it, then kprobe-tracer gives a new name.
Reported-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100827113859.22882.75598.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Fix a bug to support %return probe syntax again. Previous commit 4235b04 has a
bug which disables the %return syntax on perf probe.
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100827113852.22882.87447.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Fix a memory leak which happens when a field name conflicts with others. In
error case, free_trace_probe() will free all arguments until nr_args, so this
increments nr_args the begining of the loop instead of the end.
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
LKML-Reference: <20100827113846.22882.12670.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Reading the file set_ftrace_filter does three things.
1) shows whether or not filters are set for the function tracer
2) shows what functions are set for the function tracer
3) shows what triggers are set on any functions
3 is independent from 1 and 2.
The way this file currently works is that it is a state machine,
and as you read it, it may change state. But this assumption breaks
when you use lseek() on the file. The state machine gets out of sync
and the t_show() may use the wrong pointer and cause a kernel oops.
Luckily, this will only kill the app that does the lseek, but the app
dies while holding a mutex. This prevents anyone else from using the
set_ftrace_filter file (or any other function tracing file for that matter).
A real fix for this is to rewrite the code, but that is too much for
a -rc release or stable. This patch simply disables llseek on the
set_ftrace_filter() file for now, and we can do the proper fix for the
next major release.
Reported-by: Robert Swiecki <swiecki@google.com>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Tavis Ormandy <taviso@google.com>
Cc: Eugene Teo <eugene@redhat.com>
Cc: vendor-sec@lst.de
Cc: <stable@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Fix a bug in keyctl_session_to_parent() whereby it tries to check the ownership
of the parent process's session keyring whether or not the parent has a session
keyring [CVE-2010-2960].
This results in the following oops:
BUG: unable to handle kernel NULL pointer dereference at 00000000000000a0
IP: [<ffffffff811ae4dd>] keyctl_session_to_parent+0x251/0x443
...
Call Trace:
[<ffffffff811ae2f3>] ? keyctl_session_to_parent+0x67/0x443
[<ffffffff8109d286>] ? __do_fault+0x24b/0x3d0
[<ffffffff811af98c>] sys_keyctl+0xb4/0xb8
[<ffffffff81001eab>] system_call_fastpath+0x16/0x1b
if the parent process has no session keyring.
If the system is using pam_keyinit then it mostly protected against this as all
processes derived from a login will have inherited the session keyring created
by pam_keyinit during the log in procedure.
To test this, pam_keyinit calls need to be commented out in /etc/pam.d/.
Reported-by: Tavis Ormandy <taviso@cmpxchg8b.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Tavis Ormandy <taviso@cmpxchg8b.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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There's an protected access to the parent process's credentials in the middle
of keyctl_session_to_parent(). This results in the following RCU warning:
===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
security/keys/keyctl.c:1291 invoked rcu_dereference_check() without protection!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
1 lock held by keyctl-session-/2137:
#0: (tasklist_lock){.+.+..}, at: [<ffffffff811ae2ec>] keyctl_session_to_parent+0x60/0x236
stack backtrace:
Pid: 2137, comm: keyctl-session- Not tainted 2.6.36-rc2-cachefs+ #1
Call Trace:
[<ffffffff8105606a>] lockdep_rcu_dereference+0xaa/0xb3
[<ffffffff811ae379>] keyctl_session_to_parent+0xed/0x236
[<ffffffff811af77e>] sys_keyctl+0xb4/0xb6
[<ffffffff81001eab>] system_call_fastpath+0x16/0x1b
The code should take the RCU read lock to make sure the parents credentials
don't go away, even though it's holding a spinlock and has IRQ disabled.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
block: Range check cpu in blk_cpu_to_group
scatterlist: prevent invalid free when alloc fails
writeback: Fix lost wake-up shutting down writeback thread
writeback: do not lose wakeup events when forking bdi threads
cciss: fix reporting of max queue depth since init
block: switch s390 tape_block and mg_disk to elevator_change()
block: add function call to switch the IO scheduler from a driver
fs/bio-integrity.c: return -ENOMEM on kmalloc failure
bio-integrity.c: remove dependency on __GFP_NOFAIL
BLOCK: fix bio.bi_rw handling
block: put dev->kobj in blk_register_queue fail path
cciss: handle allocation failure
cfq-iosched: Documentation help for new tunables
cfq-iosched: blktrace print per slice sector stats
cfq-iosched: Implement tunable group_idle
cfq-iosched: Do group share accounting in IOPS when slice_idle=0
cfq-iosched: Do not idle if slice_idle=0
cciss: disable doorbell reset on reset_devices
blkio: Fix return code for mkdir calls
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While testing CPU DLPAR, the following problem was discovered.
We were DLPAR removing the first CPU, which in this case was
logical CPUs 0-3. CPUs 0-2 were already marked offline and
we were in the process of offlining CPU 3. After marking
the CPU inactive and offline in cpu_disable, but before the
cpu was completely idle (cpu_die), we ended up in __make_request
on CPU 3. There we looked at the topology map to see which CPU
to complete the I/O on and found no CPUs in the cpu_sibling_map.
This resulted in the block layer setting the completion cpu
to be NR_CPUS, which then caused an oops when we tried to
complete the I/O.
Fix this by sanity checking the value we return from blk_cpu_to_group
to be a valid cpu value.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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When alloc fails, free_table is being called. Depending on the number of
bytes requested, we determine if we are going to call _get_free_page()
or kmalloc(). When alloc fails, our math is wrong (due to sg_size - 1),
and the last buffer is wrongfully assumed to have been allocated by
kmalloc. Hence, kfree gets called and a panic occurs.
Signed-off-by: Jeffrey Carlyle <jeff.carlyle@motorola.com>
Signed-off-by: Olusanya Soyannwo <c23746@motorola.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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Setting the task state here may cause us to miss the wake up from
kthread_stop(), so we need to recheck kthread_should_stop() or risk
sleeping forever in the following schedule().
Symptom was an indefinite hang on an NFSv4 mount. (NFSv4 may create
multiple mounts in a temporary namespace while traversing the mount
path, and since the temporary namespace is immediately destroyed, it may
end up destroying a mount very soon after it was created, possibly
making this race more likely.)
INFO: task mount.nfs4:4314 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mount.nfs4 D 0000000000000000 2880 4314 4313 0x00000000
ffff88001ed6da28 0000000000000046 ffff88001ed6dfd8 ffff88001ed6dfd8
ffff88001ed6c000 ffff88001ed6c000 ffff88001ed6c000 ffff88001e5003a0
ffff88001ed6dfd8 ffff88001e5003a8 ffff88001ed6c000 ffff88001ed6dfd8
Call Trace:
[<ffffffff8196090d>] schedule_timeout+0x1cd/0x2e0
[<ffffffff8106a31c>] ? mark_held_locks+0x6c/0xa0
[<ffffffff819639a0>] ? _raw_spin_unlock_irq+0x30/0x60
[<ffffffff8106a5fd>] ? trace_hardirqs_on_caller+0x14d/0x190
[<ffffffff819671fe>] ? sub_preempt_count+0xe/0xd0
[<ffffffff8195fc80>] wait_for_common+0x120/0x190
[<ffffffff81033c70>] ? default_wake_function+0x0/0x20
[<ffffffff8195fdcd>] wait_for_completion+0x1d/0x20
[<ffffffff810595fa>] kthread_stop+0x4a/0x150
[<ffffffff81061a60>] ? thaw_process+0x70/0x80
[<ffffffff810cc68a>] bdi_unregister+0x10a/0x1a0
[<ffffffff81229dc9>] nfs_put_super+0x19/0x20
[<ffffffff810ee8c4>] generic_shutdown_super+0x54/0xe0
[<ffffffff810ee9b6>] kill_anon_super+0x16/0x60
[<ffffffff8122d3b9>] nfs4_kill_super+0x39/0x90
[<ffffffff810eda45>] deactivate_locked_super+0x45/0x60
[<ffffffff810edfb9>] deactivate_super+0x49/0x70
[<ffffffff81108294>] mntput_no_expire+0x84/0xe0
[<ffffffff811084ef>] release_mounts+0x9f/0xc0
[<ffffffff81108575>] put_mnt_ns+0x65/0x80
[<ffffffff8122cc56>] nfs_follow_remote_path+0x1e6/0x420
[<ffffffff8122cfbf>] nfs4_try_mount+0x6f/0xd0
[<ffffffff8122d0c2>] nfs4_get_sb+0xa2/0x360
[<ffffffff810edcb8>] vfs_kern_mount+0x88/0x1f0
[<ffffffff810ede92>] do_kern_mount+0x52/0x130
[<ffffffff81963d9a>] ? _lock_kernel+0x6a/0x170
[<ffffffff81108e9e>] do_mount+0x26e/0x7f0
[<ffffffff81106b3a>] ? copy_mount_options+0xea/0x190
[<ffffffff811094b8>] sys_mount+0x98/0xf0
[<ffffffff810024d8>] system_call_fastpath+0x16/0x1b
1 lock held by mount.nfs4/4314:
#0: (&type->s_umount_key#24){+.+...}, at: [<ffffffff810edfb1>] deactivate_super+0x41/0x70
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Acked-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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This patch fixes the following issue:
INFO: task mount.nfs4:1120 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mount.nfs4 D 00000000fffc6a21 0 1120 1119 0x00000000
ffff880235643948 0000000000000046 ffffffff00000000 ffffffff00000000
ffff880235643fd8 ffff880235314760 00000000001d44c0 ffff880235643fd8
00000000001d44c0 00000000001d44c0 00000000001d44c0 00000000001d44c0
Call Trace:
[<ffffffff813bc747>] schedule_timeout+0x34/0xf1
[<ffffffff813bc530>] ? wait_for_common+0x3f/0x130
[<ffffffff8106b50b>] ? trace_hardirqs_on+0xd/0xf
[<ffffffff813bc5c3>] wait_for_common+0xd2/0x130
[<ffffffff8104159c>] ? default_wake_function+0x0/0xf
[<ffffffff813beaa0>] ? _raw_spin_unlock+0x26/0x2a
[<ffffffff813bc6bb>] wait_for_completion+0x18/0x1a
[<ffffffff81101a03>] sync_inodes_sb+0xca/0x1bc
[<ffffffff811056a6>] __sync_filesystem+0x47/0x7e
[<ffffffff81105798>] sync_filesystem+0x47/0x4b
[<ffffffff810e7ffd>] generic_shutdown_super+0x22/0xd2
[<ffffffff810e80f8>] kill_anon_super+0x11/0x4f
[<ffffffffa00d06d7>] nfs4_kill_super+0x3f/0x72 [nfs]
[<ffffffff810e7b68>] deactivate_locked_super+0x21/0x41
[<ffffffff810e7fd6>] deactivate_super+0x40/0x45
[<ffffffff810fc66c>] mntput_no_expire+0xb8/0xed
[<ffffffff810fc73b>] release_mounts+0x9a/0xb0
[<ffffffff810fc7bb>] put_mnt_ns+0x6a/0x7b
[<ffffffffa00d0fb2>] nfs_follow_remote_path+0x19a/0x296 [nfs]
[<ffffffffa00d11ca>] nfs4_try_mount+0x75/0xaf [nfs]
[<ffffffffa00d1790>] nfs4_get_sb+0x276/0x2ff [nfs]
[<ffffffff810e7dba>] vfs_kern_mount+0xb8/0x196
[<ffffffff810e7ef6>] do_kern_mount+0x48/0xe8
[<ffffffff810fdf68>] do_mount+0x771/0x7e8
[<ffffffff810fe062>] sys_mount+0x83/0xbd
[<ffffffff810089c2>] system_call_fastpath+0x16/0x1b
The reason of this hang was a race condition: when the flusher thread is
forking a bdi thread, we use 'kthread_run()', so we run it _before_ we make it
visible in 'bdi->wb.task'. The bdi thread runs, does all works, and goes sleep.
'bdi->wb.task' is still NULL. And this is a dangerous time window.
If at this time someone queues a work for this bdi, he does not see the bdi
thread and wakes up the forker thread instead! But the forker has already
forked this bdi thread, but just did not make it visible yet!
The result is that we lose the wake up event for this bdi thread and the NFS4
code waits forever.
To fix the problem, we should use 'ktrhead_create()' for creating bdi threads,
then make them visible in 'bdi->wb.task', and only after this wake them up.
This is exactly what this patch does.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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The ioctl path and the scsi tape path were not accounting
for their additions to the queue depth.
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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Now that we have this API, switch the two in-kernel users to it.
Resolves an oops introduced by commit
1abec4fdbb142e3ccb6ce99832fae42129134a96.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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Currently drivers must do an elevator_exit() + elevator_init()
to switch IO schedulers. There are a few problems with this:
- Since commit 1abec4fdbb142e3ccb6ce99832fae42129134a96,
elevator_init() requires a zeroed out q->elevator
pointer. The two existing in-kernel users don't do that.
- It will only work at initialization time, since using the
above two-staged construct does not properly quisce the queue.
So add elevator_change() which takes care of this, and convert
the elv_iosched_store() sysfs interface to use this helper as well.
Reported-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reported-by: Kevin Vigor <kevin@vigor.nu>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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The kmalloc() in bio_integrity_prep() is failable, so remove __GFP_NOFAIL
from its mask.
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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Return of the bi_rw tests is no longer bool after commit 74450be1. But
results of such tests are stored in bools. This doesn't fit in there
for some compilers (gcc 4.5 here), so either use !! magic to get real
bools or use ulong where the result is assigned somewhere.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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kernel needs to kobject_put on dev->kobj if elv_register_queue fails.
Signed-off-by: Xiaotian Feng <dfeng@redhat.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Nikanth Karthikesan <knikanth@suse.de>
Cc: David Teigland <teigland@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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If kmalloc() fails then cleanup and return failure (-1).
Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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Some documentation to provide help with tunables.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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o Divyesh had gotten rid of this code in the past. I want to re-introduce it
back as it helps me a lot during debugging.
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Divyesh Shah <dpshah@google.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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o Implement a new tunable group_idle, which allows idling on the group
instead of a cfq queue. Hence one can set slice_idle = 0 and not idle
on the individual queues but idle on the group. This way on fast storage
we can get fairness between groups at the same time overall throughput
improves.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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o Implement another CFQ mode where we charge group in terms of number
of requests dispatched instead of measuring the time. Measuring in terms
of time is not possible when we are driving deeper queue depths and there
are requests from multiple cfq queues in the request queue.
o This mode currently gets activated if one sets slice_idle=0 and associated
disk supports NCQ. Again the idea is that on an NCQ disk with idling disabled
most of the queues will dispatch 1 or more requests and then cfq queue
expiry happens and we don't have a way to measure time. So start providing
fairness in terms of IOPS.
o Currently IOPS mode works only with cfq group scheduling. CFQ is following
different scheduling algorithms for queue and group scheduling. These IOPS
stats are used only for group scheduling hence in non-croup mode nothing
should change.
o For CFQ group scheduling one can disable slice idling so that we don't idle
on queue and drive deeper request queue depths (achieving better throughput),
at the same time group idle is enabled so one should get service
differentiation among groups.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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Do not idle either on cfq queue or service tree if slice_idle=0. User does
not want any queue or service tree idling. Currently even if slice_idle=0,
we were waiting for request to finish before expiring the queue and that
can lead to lower queue depths.
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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The doorbell reset initially appears to work correctly,
the controller resets, comes up, some i/o can even be
done, but on at least some Smart Arrays in some servers,
it eventually causes a subsequent controller lockup due
to some kind of PCIe error, and kdump can end up leaving
the root filesystem in an unbootable state. For this
reason, until the problem is fixed, or at least isolated
to certain hardware enough to be avoided, the doorbell
reset should not be used at all.
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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If the cgroup hierarchy for blkio control groups is deeper than two
levels, kernel should not allow the creation of further levels. mkdir
system call does not except EINVAL as a return value. This patch
replaces EINVAL with more appropriate EPERM
Signed-off-by: Ciju Rajan K <ciju@linux.vnet.ibm.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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* 'at91-fixes-for-linus' of git://github.com/at91linux/linux-2.6-at91:
AT91: at91sam9261ek: remove C99 comments but keep information
AT91: at91sam9261ek board: remove warnings related to use of SPI or SD/MMC
AT91: dm9000 initialization update
AT91: SAM9G45 - add a separate clock entry for every single TC block
AT91: clock: peripheral clocks can have other parent than mck
AT91: change dma resource index
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Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
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The sd/mmc data structure is not used if SPI is selected. The configuration
of PIO on the board prevent from using both interfaces at the same time
(board dependent).
Remove the warnings at compilation time adding a preprocessor condition.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
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Add information in dm9000 mac/phy chip initialization:
- irq resource details
- platform data details
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
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Without this patch you will not be able to register the first block
because of the second association call on at91_add_device_tc().
Signed-off-by: Fabian Godehardt <fg@emlix.com>
[nicolas.ferre@atmel.com: change tcb1_clk to fake child clock of tcb0_clk]
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
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