| Commit message (Collapse) | Author | Age | Files | Lines |
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Instead we use standard iterator way to do that.
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Some drivers often use external bvec table, so introduce
this helper for this case. It is always safe to access the
bio->bi_io_vec in this way for this case.
After converting to this usage, it will becomes a bit easier
to evaluate the remaining direct access to bio->bi_io_vec,
so it can help to prepare for the following multipage bvec
support.
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Fixed up the new O_DIRECT cases.
Signed-off-by: Jens Axboe <axboe@fb.com>
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Ensure that all ongoing dm_mq_queue_rq() and dm_mq_requeue_request()
calls have stopped before setting the "queue stopped" flag. This
allows to remove the "queue stopped" test from dm_mq_queue_rq() and
dm_mq_requeue_request(). This patch fixes a race condition because
dm_mq_queue_rq() is called without holding the queue lock and hence
BLK_MQ_S_STOPPED can be set at any time while dm_mq_queue_rq() is
in progress. This patch prevents that the following hang occurs
sporadically when using dm-mq:
INFO: task systemd-udevd:10111 blocked for more than 480 seconds.
Call Trace:
[<ffffffff8161f397>] schedule+0x37/0x90
[<ffffffff816239ef>] schedule_timeout+0x27f/0x470
[<ffffffff8161e76f>] io_schedule_timeout+0x9f/0x110
[<ffffffff8161fb36>] bit_wait_io+0x16/0x60
[<ffffffff8161f929>] __wait_on_bit_lock+0x49/0xa0
[<ffffffff8114fe69>] __lock_page+0xb9/0xc0
[<ffffffff81165d90>] truncate_inode_pages_range+0x3e0/0x760
[<ffffffff81166120>] truncate_inode_pages+0x10/0x20
[<ffffffff81212a20>] kill_bdev+0x30/0x40
[<ffffffff81213d41>] __blkdev_put+0x71/0x360
[<ffffffff81214079>] blkdev_put+0x49/0x170
[<ffffffff812141c0>] blkdev_close+0x20/0x30
[<ffffffff811d48e8>] __fput+0xe8/0x1f0
[<ffffffff811d4a29>] ____fput+0x9/0x10
[<ffffffff810842d3>] task_work_run+0x83/0xb0
[<ffffffff8106606e>] do_exit+0x3ee/0xc40
[<ffffffff8106694b>] do_group_exit+0x4b/0xc0
[<ffffffff81073d9a>] get_signal+0x2ca/0x940
[<ffffffff8101bf43>] do_signal+0x23/0x660
[<ffffffff810022b3>] exit_to_usermode_loop+0x73/0xb0
[<ffffffff81002cb0>] syscall_return_slowpath+0xb0/0xc0
[<ffffffff81624e33>] entry_SYSCALL_64_fastpath+0xa6/0xa8
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Instead of manipulating both QUEUE_FLAG_STOPPED and BLK_MQ_S_STOPPED
in the dm start and stop queue functions, only manipulate the latter
flag. Change blk_queue_stopped() tests into blk_mq_queue_stopped().
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Most blk_mq_requeue_request() and blk_mq_add_to_requeue_list() calls
are followed by kicking the requeue list. Hence add an argument to
these two functions that allows to kick the requeue list. This was
proposed by Christoph Hellwig.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Since blk_mq_requeue_work() no longer restarts stopped queues
canceling requeue work is no longer needed to prevent that a
stopped queue would be restarted. Hence remove this function.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Since blk_mq_requeue_work() starts stopped queues and since
execution of this function can be scheduled after a queue has
been stopped it is not possible to stop queues without using
an additional state variable to track whether or not the queue
has been stopped. Hence modify blk_mq_requeue_work() such that it
does not start stopped queues. My conclusion after a review of
the blk_mq_stop_hw_queues() and blk_mq_{delay_,}kick_requeue_list()
callers is as follows:
* In the dm driver starting and stopping queues should only happen
if __dm_suspend() or __dm_resume() is called and not if the
requeue list is processed.
* In the SCSI core queue stopping and starting should only be
performed by the scsi_internal_device_block() and
scsi_internal_device_unblock() functions but not by any other
function. Although the blk_mq_stop_hw_queue() call in
scsi_queue_rq() may help to reduce CPU load if a LLD queue is
full, figuring out whether or not a queue should be restarted
when requeueing a command would require to introduce additional
locking in scsi_mq_requeue_cmd() to avoid a race with
scsi_internal_device_block(). Avoid this complexity by removing
the blk_mq_stop_hw_queue() call from scsi_queue_rq().
* In the NVMe core only the functions that call
blk_mq_start_stopped_hw_queues() explicitly should start stopped
queues.
* A blk_mq_start_stopped_hwqueues() call must be added in the
xen-blkfront driver in its blkif_recover() function.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Roger Pau Monné <roger.pau@citrix.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: James Bottomley <jejb@linux.vnet.ibm.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Remove the WRITE_* and READ_SYNC wrappers, and just use the flags
directly. Where applicable this also drops usage of the
bio_set_op_attrs wrapper.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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(and remove one layer of masking for the op_is_write call next to it).
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Now that we don't need the common flags to overflow outside the range
of a 32-bit type we can encode them the same way for both the bio and
request fields. This in addition allows us to place the operation
first (and make some room for more ops while we're at it) and to
stop having to shift around the operation values.
In addition this allows passing around only one value in the block layer
instead of two (and eventuall also in the file systems, but we can do
that later) and thus clean up a lot of code.
Last but not least this allows decreasing the size of the cmd_flags
field in struct request to 32-bits. Various functions passing this
value could also be updated, but I'd like to avoid the churn for now.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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A lot of the REQ_* flags are only used on struct requests, and only of
use to the block layer and a few drivers that dig into struct request
internals.
This patch adds a new req_flags_t rq_flags field to struct request for
them, and thus dramatically shrinks the number of common requests. It
also removes the unfortunate situation where we have to fit the fields
from the same enum into 32 bits for struct bio and 64 bits for
struct request.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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A good practice is to prefix the names of functions by the name
of the subsystem.
The kthread worker API is a mix of classic kthreads and workqueues. Each
worker has a dedicated kthread. It runs a generic function that process
queued works. It is implemented as part of the kthread subsystem.
This patch renames the existing kthread worker API to use
the corresponding name from the workqueues API prefixed by
kthread_:
__init_kthread_worker() -> __kthread_init_worker()
init_kthread_worker() -> kthread_init_worker()
init_kthread_work() -> kthread_init_work()
insert_kthread_work() -> kthread_insert_work()
queue_kthread_work() -> kthread_queue_work()
flush_kthread_work() -> kthread_flush_work()
flush_kthread_worker() -> kthread_flush_worker()
Note that the names of DEFINE_KTHREAD_WORK*() macros stay
as they are. It is common that the "DEFINE_" prefix has
precedence over the subsystem names.
Note that INIT() macros and init() functions use different
naming scheme. There is no good solution. There are several
reasons for this solution:
+ "init" in the function names stands for the verb "initialize"
aka "initialize worker". While "INIT" in the macro names
stands for the noun "INITIALIZER" aka "worker initializer".
+ INIT() macros are used only in DEFINE() macros
+ init() functions are used close to the other kthread()
functions. It looks much better if all the functions
use the same scheme.
+ There will be also kthread_destroy_worker() that will
be used close to kthread_cancel_work(). It is related
to the init() function. Again it looks better if all
functions use the same naming scheme.
+ there are several precedents for such init() function
names, e.g. amd_iommu_init_device(), free_area_init_node(),
jump_label_init_type(), regmap_init_mmio_clk(),
+ It is not an argument but it was inconsistent even before.
[arnd@arndb.de: fix linux-next merge conflict]
Link: http://lkml.kernel.org/r/20160908135724.1311726-1-arnd@arndb.de
Link: http://lkml.kernel.org/r/1470754545-17632-3-git-send-email-pmladek@suse.com
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Borislav Petkov <bp@suse.de>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Pull blk-mq irq/cpu mapping updates from Jens Axboe:
"This is the block-irq topic branch for 4.9-rc. It's mostly from
Christoph, and it allows drivers to specify their own mappings, and
more importantly, to share the blk-mq mappings with the IRQ affinity
mappings. It's a good step towards making this work better out of the
box"
* 'for-4.9/block-irq' of git://git.kernel.dk/linux-block:
blk_mq: linux/blk-mq.h does not include all the headers it depends on
blk-mq: kill unused blk_mq_create_mq_map()
blk-mq: get rid of the cpumask in struct blk_mq_tags
nvme: remove the post_scan callout
nvme: switch to use pci_alloc_irq_vectors
blk-mq: provide a default queue mapping for PCI device
blk-mq: allow the driver to pass in a queue mapping
blk-mq: remove ->map_queue
blk-mq: only allocate a single mq_map per tag_set
blk-mq: don't redistribute hardware queues on a CPU hotplug event
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All drivers use the default, so provide an inline version of it. If we
ever need other queue mapping we can add an optional method back,
although supporting will also require major changes to the queue setup
code.
This provides better code generation, and better debugability as well.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into for-4.9/msi-irq
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git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
Pull device mapper updates from Mike Snitzer:
- various fixes and cleanups for request-based DM core
- add support for delaying the requeue of requests; used by DM
multipath when all paths have failed and 'queue_if_no_path' is
enabled
- DM cache improvements to speedup the loading metadata and the writing
of the hint array
- fix potential for a dm-crypt crash on device teardown
- remove dm_bufio_cond_resched() and just using cond_resched()
- change DM multipath to return a reservation conflict error
immediately; rather than failing the path and retrying (potentially
indefinitely)
* tag 'dm-4.9-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (24 commits)
dm mpath: always return reservation conflict without failing over
dm bufio: remove dm_bufio_cond_resched()
dm crypt: fix crash on exit
dm cache metadata: switch to using the new cursor api for loading metadata
dm array: introduce cursor api
dm btree: introduce cursor api
dm cache policy smq: distribute entries to random levels when switching to smq
dm cache: speed up writing of the hint array
dm array: add dm_array_new()
dm mpath: delay the requeue of blk-mq requests while all paths down
dm mpath: use dm_mq_kick_requeue_list()
dm rq: introduce dm_mq_kick_requeue_list()
dm rq: reduce arguments passed to map_request() and dm_requeue_original_request()
dm rq: add DM_MAPIO_DELAY_REQUEUE to delay requeue of blk-mq requests
dm: convert wait loops to use autoremove_wake_function()
dm: use signal_pending_state() in dm_wait_for_completion()
dm: rename task state function arguments
dm: add two lockdep_assert_held() statements
dm rq: simplify dm_old_stop_queue()
dm mpath: check if path's request_queue is dying in activate_path()
...
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If dm-mpath encounters an reservation conflict it should not fail the
path (as communication with the target is not affected) but should
rather retry on another path. However, in doing so we might be inducing
a ping-pong between paths, with no guarantee of any forward progress.
And arguably a reservation conflict is an unexpected error, so we should
be passing it upwards to allow the application to take appropriate
steps.
This change resolves a show-stopper problem seen with the pNFS SCSI
layout because it is trivial to hit reservation conflict based failover
loops without it.
Doubts were raised about the implications of this change relative to
products like IBM's SVC. But there is little point withholding a fix
for Linux because a proprietary product may or may not have some issues
in its implementation of how it interfaces with Linux. In the future,
if there is glaring evidence that this change is certainly problematic
we can revisit it.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com> # tweaked header
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Use cond_resched() like everybody else.
Mikulas explained why dm_bufio_cond_resched() was introduced to begin
with (hopefully cond_resched can be improved accordingly) here:
https://www.redhat.com/archives/dm-devel/2016-September/msg00112.html
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Alasdair Kergon <agk@redhat.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com> # added last comment in header
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As the documentation for kthread_stop() says, "if threadfn() may call
do_exit() itself, the caller must ensure task_struct can't go away".
dm-crypt does not ensure this and therefore crashes when crypt_dtr()
calls kthread_stop(). The crash is trivially reproducible by adding a
delay before the call to kthread_stop() and just opening and closing a
dm-crypt device.
general protection fault: 0000 [#1] PREEMPT SMP
CPU: 0 PID: 533 Comm: cryptsetup Not tainted 4.8.0-rc7+ #7
task: ffff88003bd0df40 task.stack: ffff8800375b4000
RIP: 0010: kthread_stop+0x52/0x300
Call Trace:
crypt_dtr+0x77/0x120
dm_table_destroy+0x6f/0x120
__dm_destroy+0x130/0x250
dm_destroy+0x13/0x20
dev_remove+0xe6/0x120
? dev_suspend+0x250/0x250
ctl_ioctl+0x1fc/0x530
? __lock_acquire+0x24f/0x1b10
dm_ctl_ioctl+0x13/0x20
do_vfs_ioctl+0x91/0x6a0
? ____fput+0xe/0x10
? entry_SYSCALL_64_fastpath+0x5/0xbd
? trace_hardirqs_on_caller+0x151/0x1e0
SyS_ioctl+0x41/0x70
entry_SYSCALL_64_fastpath+0x1f/0xbd
This problem was introduced by bcbd94ff481e ("dm crypt: fix a possible
hang due to race condition on exit").
Looking at the description of that patch (excerpted below), it seems
like the problem it addresses can be solved by just using
set_current_state instead of __set_current_state, since we obviously
need the memory barrier.
| dm crypt: fix a possible hang due to race condition on exit
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| A kernel thread executes __set_current_state(TASK_INTERRUPTIBLE),
| __add_wait_queue, spin_unlock_irq and then tests kthread_should_stop().
| It is possible that the processor reorders memory accesses so that
| kthread_should_stop() is executed before __set_current_state(). If
| such reordering happens, there is a possible race on thread
| termination: [...]
So this patch just reverts the aforementioned patch and changes the
__set_current_state(TASK_INTERRUPTIBLE) to set_current_state(...). This
fixes the crash and should also fix the potential hang.
Fixes: bcbd94ff481e ("dm crypt: fix a possible hang due to race condition on exit")
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org # v4.0+
Signed-off-by: Rabin Vincent <rabinv@axis.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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This change offers a pretty significant performance improvement.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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More efficient way to iterate an array due to prefetching (makes use of
the new dm_btree_cursor_* api).
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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This uses prefetching to speed up iteration through a btree.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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For smq the 32 bit 'hint' stores the multiqueue level that the entry
should be stored in. If a different policy has been used previously,
and then switched to smq, the hints will be invalid. In which case we
used to put all entries in the bottom level of the multiqueue, and then
redistribute. Redistribution is faster if we put entries with invalid
hints in random levels initially.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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It's far quicker to always delete the hint array and recreate with
dm_array_new() because we avoid the copying caused by mutation.
Also simplifies the policy interface, replacing the walk_hints() with
the simpler get_hint().
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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dm_array_new() creates a new, populated array more efficiently than
starting with an empty one and resizing.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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Return DM_MAPIO_DELAY_REQUEUE from .clone_and_map_rq. Also, return
false from .busy, if all paths are down, so that blk-mq requests get
mapped via .clone_and_map_rq -- which results in DM_MAPIO_DELAY_REQUEUE
being returned to dm-rq.
This change allows for a noticeable reduction in cpu utilization
(reduced kworker load) while all paths are down, e.g.:
system CPU idleness (as measured by fio's --idle-prof=system):
before: system: 86.58%
after: system: 98.60%
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
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When reinstating a path the blk-mq request_queue's requeue_list should
get kicked. It makes sense to kick the requeue_list as part of the
existing hook (previously only used by bio-based support).
Rename process_queued_bios_list to process_queued_io_list.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
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Make it possible for a request-based target to kick the DM device's
blk-mq request_queue's requeue_list.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
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dm_requeue_original_request()
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
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Otherwise blk-mq will immediately dispatch requests that are requeued
via a BLK_MQ_RQ_QUEUE_BUSY return from blk_mq_ops .queue_rq.
Delayed requeue is implemented using blk_mq_delay_kick_requeue_list()
with a delay of 5 secs. In the context of DM multipath (all paths down)
it doesn't make any sense to requeue more quickly.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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Use autoremove_wake_function() instead of default_wake_function()
to make the dm wait loops more similar to other wait loops in the
kernel. This patch does not change any functionality.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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Use signal_pending_state() instead of open-coding it. This patch does
not change any functionality but makes it possible to pass TASK_KILLABLE
as the second argument of dm_wait_for_completion(). See also commit
16882c1e962b ("sched: fix TASK_WAKEKILL vs SIGKILL race").
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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Rename 'interruptible' into 'task_state' to make it clear that this
argument is a task state instead of a boolean. Also, change type from
int to long.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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Document the locking assumptions for the __bind() and __dm_suspend()
functions.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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This patch does not change any functionality.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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If pg_init_retries is set and a request is queued against a multipath
device with all underlying block device request_queues in the "dying"
state then an infinite loop is triggered because activate_path() never
succeeds and hence never calls pg_init_done().
This change avoids that device removal triggers an infinite loop by
failing the activate_path() which causes the "dying" path to be failed.
Reported-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
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Every call of queue_flag_clear_unlocked() after block device
initialization has finished is wrong if blk_cleanup_queue() can be
called concurrently. Convert queue_flag_clear_unlocked() into
queue_flag_clear() and protect it by the block layer queue lock.
Also, factor out dm_mq_start_queue().
Reported-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
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Also, check that the blk-mq request_queue isn't already stopped.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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This avoids that new requests are queued while __dm_destroy() is in
progress.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
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dm_resume() will return success (0) rather than -EINVAL if
!dm_suspended_md() upon retry within dm_resume().
Reset the error code at the start of dm_resume()'s retry loop.
Also, remove a useless assignment at the end of dm_resume().
Fixes: ffcc393641 ("dm: enhance internal suspend and resume interface")
Cc: stable@vger.kernel.org # 3.19+
Signed-off-by: Minfei Huang <mnghuan@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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Pull block layer updates from Jens Axboe:
"This is the main pull request for block layer changes in 4.9.
As mentioned at the last merge window, I've changed things up and now
do just one branch for core block layer changes, and driver changes.
This avoids dependencies between the two branches. Outside of this
main pull request, there are two topical branches coming as well.
This pull request contains:
- A set of fixes, and a conversion to blk-mq, of nbd. From Josef.
- Set of fixes and updates for lightnvm from Matias, Simon, and Arnd.
Followup dependency fix from Geert.
- General fixes from Bart, Baoyou, Guoqing, and Linus W.
- CFQ async write starvation fix from Glauber.
- Add supprot for delayed kick of the requeue list, from Mike.
- Pull out the scalable bitmap code from blk-mq-tag.c and make it
generally available under the name of sbitmap. Only blk-mq-tag uses
it for now, but the blk-mq scheduling bits will use it as well.
From Omar.
- bdev thaw error progagation from Pierre.
- Improve the blk polling statistics, and allow the user to clear
them. From Stephen.
- Set of minor cleanups from Christoph in block/blk-mq.
- Set of cleanups and optimizations from me for block/blk-mq.
- Various nvme/nvmet/nvmeof fixes from the various folks"
* 'for-4.9/block' of git://git.kernel.dk/linux-block: (54 commits)
fs/block_dev.c: return the right error in thaw_bdev()
nvme: Pass pointers, not dma addresses, to nvme_get/set_features()
nvme/scsi: Remove power management support
nvmet: Make dsm number of ranges zero based
nvmet: Use direct IO for writes
admin-cmd: Added smart-log command support.
nvme-fabrics: Add host_traddr options field to host infrastructure
nvme-fabrics: revise host transport option descriptions
nvme-fabrics: rework nvmf_get_address() for variable options
nbd: use BLK_MQ_F_BLOCKING
blkcg: Annotate blkg_hint correctly
cfq: fix starvation of asynchronous writes
blk-mq: add flag for drivers wanting blocking ->queue_rq()
blk-mq: remove non-blocking pass in blk_mq_map_request
blk-mq: get rid of manual run of queue with __blk_mq_run_hw_queue()
block: export bio_free_pages to other modules
lightnvm: propagate device_add() error code
lightnvm: expose device geometry through sysfs
lightnvm: control life of nvm_dev in driver
blk-mq: register device instead of disk
...
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bio_free_pages is introduced in commit 1dfa0f68c040
("block: add a helper to free bio bounce buffer pages"),
we can reuse the func in other modules after it was
imported.
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@fb.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Shaohua Li <shli@fb.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Acked-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Enable devices without a gendisk instance to register itself with blk-mq
and expose the associated multi-queue sysfs entries.
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Introduce the bio_flags() macro. Ensure that the second argument of
bio_set_op_attrs() only contains flags and no operation. This patch
does not change any functionality.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Mike Christie <mchristi@redhat.com>
Cc: Chris Mason <clm@fb.com> (maintainer:BTRFS FILE SYSTEM)
Cc: Josef Bacik <jbacik@fb.com> (maintainer:BTRFS FILE SYSTEM)
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Damien Le Moal <damien.lemoal@hgst.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Pull MD updates from Shaohua Li:
"This update includes:
- new AVX512 instruction based raid6 gen/recovery algorithm
- a couple of md-cluster related bug fixes
- fix a potential deadlock
- set nonrotational bit for raid array with SSD
- set correct max_hw_sectors for raid5/6, which hopefuly can improve
performance a little bit
- other minor fixes"
* tag 'md/4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md:
md: set rotational bit
raid6/test/test.c: bug fix: Specify aligned(alignment) attributes to the char arrays
raid5: handle register_shrinker failure
raid5: fix to detect failure of register_shrinker
md: fix a potential deadlock
md/bitmap: fix wrong cleanup
raid5: allow arbitrary max_hw_sectors
lib/raid6: Add AVX512 optimized xor_syndrome functions
lib/raid6/test/Makefile: Add avx512 gen_syndrome and recovery functions
lib/raid6: Add AVX512 optimized recovery functions
lib/raid6: Add AVX512 optimized gen_syndrome functions
md-cluster: make resync lock also could be interruptted
md-cluster: introduce dlm_lock_sync_interruptible to fix tasks hang
md-cluster: convert the completion to wait queue
md-cluster: protect md_find_rdev_nr_rcu with rcu lock
md-cluster: clean related infos of cluster
md: changes for MD_STILL_CLOSED flag
md-cluster: remove some unnecessary dlm_unlock_sync
md-cluster: use FORCEUNLOCK in lockres_free
md-cluster: call md_kick_rdev_from_array once ack failed
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if all disks in an array are non-rotational, set the array
non-rotational.
This only works for array with all disks populated at startup. Support
for disk hotadd/hotremove could be added later if necessary.
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Shaohua Li <shli@fb.com>
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register_shrinker() now can fail. When it happens, shrinker.nr_deferred is
null. We use it to determine if unregister_shrinker is required.
Signed-off-by: Shaohua Li <shli@fb.com>
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register_shrinker can fail after commit 1d3d4437eae1 ("vmscan: per-node
deferred work"), we should detect the failure of it, otherwise we may
fail to register shrinker after raid5 configuration was setup successfully.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Shaohua Li <shli@fb.com>
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lockdep reports a potential deadlock. Fix this by droping the mutex
before md_import_device
[ 1137.126601] ======================================================
[ 1137.127013] [ INFO: possible circular locking dependency detected ]
[ 1137.127013] 4.8.0-rc4+ #538 Not tainted
[ 1137.127013] -------------------------------------------------------
[ 1137.127013] mdadm/16675 is trying to acquire lock:
[ 1137.127013] (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81243cf3>] __blkdev_get+0x63/0x450
[ 1137.127013]
but task is already holding lock:
[ 1137.127013] (detected_devices_mutex){+.+.+.}, at: [<ffffffff81a5138c>] md_ioctl+0x2ac/0x1f50
[ 1137.127013]
which lock already depends on the new lock.
[ 1137.127013]
the existing dependency chain (in reverse order) is:
[ 1137.127013]
-> #1 (detected_devices_mutex){+.+.+.}:
[ 1137.127013] [<ffffffff810b6f19>] lock_acquire+0xb9/0x220
[ 1137.127013] [<ffffffff81c51647>] mutex_lock_nested+0x67/0x3d0
[ 1137.127013] [<ffffffff81a4eeaf>] md_autodetect_dev+0x3f/0x90
[ 1137.127013] [<ffffffff81595be8>] rescan_partitions+0x1a8/0x2c0
[ 1137.127013] [<ffffffff81590081>] __blkdev_reread_part+0x71/0xb0
[ 1137.127013] [<ffffffff815900e5>] blkdev_reread_part+0x25/0x40
[ 1137.127013] [<ffffffff81590c4b>] blkdev_ioctl+0x51b/0xa30
[ 1137.127013] [<ffffffff81242bf1>] block_ioctl+0x41/0x50
[ 1137.127013] [<ffffffff81214c96>] do_vfs_ioctl+0x96/0x6e0
[ 1137.127013] [<ffffffff81215321>] SyS_ioctl+0x41/0x70
[ 1137.127013] [<ffffffff81c56825>] entry_SYSCALL_64_fastpath+0x18/0xa8
[ 1137.127013]
-> #0 (&bdev->bd_mutex){+.+.+.}:
[ 1137.127013] [<ffffffff810b6af2>] __lock_acquire+0x1662/0x1690
[ 1137.127013] [<ffffffff810b6f19>] lock_acquire+0xb9/0x220
[ 1137.127013] [<ffffffff81c51647>] mutex_lock_nested+0x67/0x3d0
[ 1137.127013] [<ffffffff81243cf3>] __blkdev_get+0x63/0x450
[ 1137.127013] [<ffffffff81244307>] blkdev_get+0x227/0x350
[ 1137.127013] [<ffffffff812444f6>] blkdev_get_by_dev+0x36/0x50
[ 1137.127013] [<ffffffff81a46d65>] lock_rdev+0x35/0x80
[ 1137.127013] [<ffffffff81a49bb4>] md_import_device+0xb4/0x1b0
[ 1137.127013] [<ffffffff81a513d6>] md_ioctl+0x2f6/0x1f50
[ 1137.127013] [<ffffffff815909b3>] blkdev_ioctl+0x283/0xa30
[ 1137.127013] [<ffffffff81242bf1>] block_ioctl+0x41/0x50
[ 1137.127013] [<ffffffff81214c96>] do_vfs_ioctl+0x96/0x6e0
[ 1137.127013] [<ffffffff81215321>] SyS_ioctl+0x41/0x70
[ 1137.127013] [<ffffffff81c56825>] entry_SYSCALL_64_fastpath+0x18/0xa8
[ 1137.127013]
other info that might help us debug this:
[ 1137.127013] Possible unsafe locking scenario:
[ 1137.127013] CPU0 CPU1
[ 1137.127013] ---- ----
[ 1137.127013] lock(detected_devices_mutex);
[ 1137.127013] lock(&bdev->bd_mutex);
[ 1137.127013] lock(detected_devices_mutex);
[ 1137.127013] lock(&bdev->bd_mutex);
[ 1137.127013]
*** DEADLOCK ***
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>
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if bitmap_create fails, the bitmap is already cleaned up and the returned value
is an error number. We can't do the cleanup again.
Reported-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Shaohua Li <shli@fb.com>
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