- 24 Mar, 2017 1 commit
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Geliang Tang authored
Use setup_timer() instead of init_timer() to simplify the code. Signed-off-by:
Geliang Tang <geliangtang@gmail.com> Signed-off-by:
Jens Axboe <axboe@fb.com>
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- 23 Mar, 2017 16 commits
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Dan Carpenter authored
There isn't a bug here, but Smatch is not smart enough to know that "nr_iovecs" can't be negative so it complains about underflows. Really, it's slightly cleaner to make this parameter unsigned. Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Christoph Hellwig authored
Turn the different ways of merging or issuing I/O into a series of if/else statements instead of the current maze of gotos. Note that this means we pin the CPU a little longer for some cases as the CTX put is moved to common code at the end of the function. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Christoph Hellwig authored
Now that we have a nice direct issue heper this helps simplifying the code a bit, and also gets rid of the old_rq variable. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Christoph Hellwig authored
Rename blk_mq_try_issue_directly to __blk_mq_try_issue_directly and add a new wrapper that takes care of RCU / SRCU locking to avoid having boileplate code in the caller which would get duplicated with new callers. Signed-off-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Christoph Hellwig authored
They are mostly the same code anyway - this just one small conditional for the plug case that is different for both variants. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Christoph Hellwig authored
This flag was never used since it was introduced. Signed-off-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by:
Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Jan Kara authored
When device open races with device shutdown, we can get the following oops in scsi_disk_get(): [11863.044351] general protection fault: 0000 [#1] SMP [11863.045561] Modules linked in: scsi_debug xfs libcrc32c netconsole btrfs raid6_pq zlib_deflate lzo_compress xor [last unloaded: loop] [11863.047853] CPU: 3 PID: 13042 Comm: hald-probe-stor Tainted: G W 4.10.0-rc2-xen+ #35 [11863.048030] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [11863.048030] task: ffff88007f438200 task.stack: ffffc90000fd0000 [11863.048030] RIP: 0010:scsi_disk_get+0x43/0x70 [11863.048030] RSP: 0018:ffffc90000fd3a08 EFLAGS: 00010202 [11863.048030] RAX: 6b6b6b6b6b6b6b6b RBX: ffff88007f56d000 RCX: 0000000000000000 [11863.048030] RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff81a8d880 [11863.048030] RBP: ffffc90000fd3a18 R08: 0000000000000000 R09: 0000000000000001 [11863.059217] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000fffffffa [11863.059217] R13: ffff880078872800 R14: ffff880070915540 R15: 000000000000001d [11863.059217] FS: 00007f2611f71800(0000) GS:ffff88007f0c0000(0000) knlGS:0000000000000000 [11863.059217] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [11863.059217] CR2: 000000000060e048 CR3: 00000000778d4000 CR4: 00000000000006e0 [11863.059217] Call Trace: [11863.059217] ? disk_get_part+0x22/0x1f0 [11863.059217] sd_open+0x39/0x130 [11863.059217] __blkdev_get+0x69/0x430 [11863.059217] ? bd_acquire+0x7f/0xc0 [11863.059217] ? bd_acquire+0x96/0xc0 [11863.059217] ? blkdev_get+0x350/0x350 [11863.059217] blkdev_get+0x126/0x350 [11863.059217] ? _raw_spin_unlock+0x2b/0x40 [11863.059217] ? bd_acquire+0x7f/0xc0 [11863.059217] ? blkdev_get+0x350/0x350 [11863.059217] blkdev_open+0x65/0x80 ... As you can see RAX value is already poisoned showing that gendisk we got is already freed. The problem is that get_gendisk() looks up device number in ext_devt_idr and then does get_disk() which does kobject_get() on the disks kobject. However the disk gets removed from ext_devt_idr only in disk_release() (through blk_free_devt()) at which moment it has already 0 refcount and is already on its way to be freed. Indeed we've got a warning from kobject_get() about 0 refcount shortly before the oops. We fix the problem by using kobject_get_unless_zero() in get_disk() so that get_disk() cannot get reference on a disk that is already being freed. Tested-by:
Lekshmi Pillai <lekshmicpillai@in.ibm.com> Reviewed-by:
Bart Van Assche <bart.vanassche@sandisk.com> Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Jan Kara authored
Make the function available for outside use and fortify it against NULL kobject. CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by:
Bart Van Assche <bart.vanassche@sandisk.com> Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Jan Kara authored
When block device is closed, we call inode_detach_wb() in __blkdev_put() which sets inode->i_wb to NULL. That is contrary to expectations that inode->i_wb stays valid once set during the whole inode's lifetime and leads to oops in wb_get() in locked_inode_to_wb_and_lock_list() because inode_to_wb() returned NULL. The reason why we called inode_detach_wb() is not valid anymore though. BDI is guaranteed to stay along until we call bdi_put() from bdev_evict_inode() so we can postpone calling inode_detach_wb() to that moment. Also add a warning to catch if someone uses inode_detach_wb() in a dangerous way. Reported-by:
Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Jan Kara authored
Rename cgwb_bdi_destroy() to cgwb_bdi_unregister() as it gets called from bdi_unregister() which is not necessarily called from bdi_destroy() and thus the name is somewhat misleading. Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Jan Kara authored
Currently we wait for all cgwbs to get released in cgwb_bdi_destroy() (called from bdi_unregister()). That is however unnecessary now when cgwb->bdi is a proper refcounted reference (thus bdi cannot get released before all cgwbs are released) and when cgwb_bdi_destroy() shuts down writeback directly. Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Jan Kara authored
Currently we waited for all cgwbs to get freed in cgwb_bdi_destroy() which also means that writeback has been shutdown on them. Since this wait is going away, directly shutdown writeback on cgwbs from cgwb_bdi_destroy() to avoid live writeback structures after bdi_unregister() has finished. To make that safe with concurrent shutdown from cgwb_release_workfn(), we also have to make sure wb_shutdown() returns only after the bdi_writeback structure is really shutdown. Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Jan Kara authored
Currently root wb_writeback structure is added to bdi->wb_list in bdi_init() and never removed. That is different from all other wb_writeback structures which get added to the list when created and removed from it before wb_shutdown(). So move list addition of root bdi_writeback to bdi_register() and list removal of all wb_writeback structures to wb_shutdown(). That way a wb_writeback structure is on bdi->wb_list if and only if it can handle writeback and it will make it easier for us to handle shutdown of all wb_writeback structures in bdi_unregister(). Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Jan Kara authored
Make wb->bdi a proper refcounted reference to bdi for all bdi_writeback structures except for the one embedded inside struct backing_dev_info. That will allow us to simplify bdi unregistration. Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Jan Kara authored
congested->bdi pointer is used only to be able to remove congested structure from bdi->cgwb_congested_tree on structure release. Moreover the pointer can become NULL when we unregister the bdi. Rename the field to __bdi and add a comment to make it more explicit this is internal stuff of memcg writeback code and people should not use the field as such use will be likely race prone. We do not bother with converting congested->bdi to a proper refcounted reference. It will be slightly ugly to special-case bdi->wb.congested to avoid effectively a cyclic reference of bdi to itself and the reference gets cleared from bdi_unregister() making it impossible to reference a freed bdi. Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Jan Kara authored
When disk->fops->open() in __blkdev_get() returns -ERESTARTSYS, we restart the process of opening the block device. However we forget to switch bdev->bd_bdi back to noop_backing_dev_info and as a result bdev inode will be pointing to a stale bdi. Fix the problem by setting bdev->bd_bdi later when __blkdev_get() is already guaranteed to succeed. Acked-by:
Tejun Heo <tj@kernel.org> Reviewed-by:
Hannes Reinecke <hare@suse.com> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com>
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- 21 Mar, 2017 6 commits
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Jens Axboe authored
If a driver allocates a queue for stacked usage, then it does not currently get stats allocated. This causes the later init of, eg, writeback throttling to blow up. Move the init to the queue allocation instead. Additionally, allow a NULL callback unregistration. This avoids having the caller check for that, fixing another oops on removal of a block device that doesn't have poll stats allocated. Fixes: 34dbad5d ("blk-stat: convert to callback-based statistics reporting") Signed-off-by:
Jens Axboe <axboe@fb.com>
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Omar Sandoval authored
Currently, statistics are gathered in ~0.13s windows, and users grab the statistics whenever they need them. This is not ideal for both in-tree users: 1. Writeback throttling wants its own dynamically sized window of statistics. Since the blk-stats statistics are reset after every window and the wbt windows don't line up with the blk-stats windows, wbt doesn't see every I/O. 2. Polling currently grabs the statistics on every I/O. Again, depending on how the window lines up, we may miss some I/Os. It's also unnecessary overhead to get the statistics on every I/O; the hybrid polling heuristic would be just as happy with the statistics from the previous full window. This reworks the blk-stats infrastructure to be callback-based: users register a callback that they want called at a given time with all of the statistics from the window during which the callback was active. Users can dynamically bucketize the statistics. wbt and polling both currently use read vs. write, but polling can be extended to further subdivide based on request size. The callbacks are kept on an RCU list, and each callback has percpu stats buffers. There will only be a few users, so the overhead on the I/O completion side is low. The stats flushing is also simplified considerably: since the timer function is responsible for clearing the statistics, we don't have to worry about stale statistics. wbt is a trivial conversion. After the conversion, the windowing problem mentioned above is fixed. For polling, we register an extra callback that caches the previous window's statistics in the struct request_queue for the hybrid polling heuristic to use. Since we no longer have a single stats buffer for the request queue, this also removes the sysfs and debugfs stats entries. To replace those, we add a debugfs entry for the poll statistics. Signed-off-by:
Omar Sandoval <osandov@fb.com> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Omar Sandoval authored
This is an implementation detail that no-one outside of blk-stat.c uses. Signed-off-by:
Omar Sandoval <osandov@fb.com> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Omar Sandoval authored
The stats buckets will become generic soon, so make the existing users use the common READ and WRITE definitions instead of one internal to blk-stat. Signed-off-by:
Omar Sandoval <osandov@fb.com> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Omar Sandoval authored
We always call wbt_exit() from blk_release_queue(), so these are unnecessary. Signed-off-by:
Omar Sandoval <osandov@fb.com> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Omar Sandoval authored
We need to flush the batch _before_ we check the number of samples, otherwise we'll miss all of the batched samples. Fixes: cf43e6be ("block: add scalable completion tracking of requests") Signed-off-by:
Omar Sandoval <osandov@fb.com> Signed-off-by:
Jens Axboe <axboe@fb.com>
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- 20 Mar, 2017 5 commits
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Linus Torvalds authored
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Linus Torvalds authored
This BUG_ON() triggered for me once at shutdown, and I don't see a reason for the check. The code correctly checks whether the swap slot cache is usable or not, so an uninitialized swap slot cache is not actually problematic afaik. I've temporarily just switched the BUG_ON() to a WARN_ON_ONCE(), since I'm not sure why that seemingly pointless check was there. I suspect the real fix is to just remove it entirely, but for now we'll warn about it but not bring the machine down. Cc: "Huang, Ying" <ying.huang@intel.com> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linuxLinus Torvalds authored
Pull more powerpc fixes from Michael Ellerman: "A couple of minor powerpc fixes for 4.11: - wire up statx() syscall - don't print a warning on memory hotplug when HPT resizing isn't available Thanks to: David Gibson, Chandan Rajendra" * tag 'powerpc-4.11-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/pseries: Don't give a warning when HPT resizing isn't available powerpc: Wire up statx() syscall
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git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linuxLinus Torvalds authored
Pull parisc fixes from Helge Deller: - Mikulas Patocka added support for R_PARISC_SECREL32 relocations in modules with CONFIG_MODVERSIONS. - Dave Anglin optimized the cache flushing for vmap ranges. - Arvind Yadav provided a fix for a potential NULL pointer dereference in the parisc perf code (and some code cleanups). - I wired up the new statx system call, fixed some compiler warnings with the access_ok() macro and fixed shutdown code to really halt a system at shutdown instead of crashing & rebooting. * 'parisc-4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Fix system shutdown halt parisc: perf: Fix potential NULL pointer dereference parisc: Avoid compiler warnings with access_ok() parisc: Wire up statx system call parisc: Optimize flush_kernel_vmap_range and invalidate_kernel_vmap_range parisc: support R_PARISC_SECREL32 relocation in modules
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git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pendingLinus Torvalds authored
Pull SCSI target fixes from Nicholas Bellinger: "The bulk of the changes are in qla2xxx target driver code to address various issues found during Cavium/QLogic's internal testing (stable CC's included), along with a few other stability and smaller miscellaneous improvements. There are also a couple of different patch sets from Mike Christie, which have been a result of his work to use target-core ALUA logic together with tcm-user backend driver. Finally, a patch to address some long standing issues with pass-through SCSI export of TYPE_TAPE + TYPE_MEDIUM_CHANGER devices, which will make folks using physical (or virtual) magnetic tape happy" * git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (28 commits) qla2xxx: Update driver version to 9.00.00.00-k qla2xxx: Fix delayed response to command for loop mode/direct connect. qla2xxx: Change scsi host lookup method. qla2xxx: Add DebugFS node to display Port Database qla2xxx: Use IOCB interface to submit non-critical MBX. qla2xxx: Add async new target notification qla2xxx: Export DIF stats via debugfs qla2xxx: Improve T10-DIF/PI handling in driver. qla2xxx: Allow relogin to proceed if remote login did not finish qla2xxx: Fix sess_lock & hardware_lock lock order problem. qla2xxx: Fix inadequate lock protection for ABTS. qla2xxx: Fix request queue corruption. qla2xxx: Fix memory leak for abts processing qla2xxx: Allow vref count to timeout on vport delete. tcmu: Convert cmd_time_out into backend device attribute tcmu: make cmd timeout configurable tcmu: add helper to check if dev was configured target: fix race during implicit transition work flushes target: allow userspace to set state to transitioning target: fix ALUA transition timeout handling ...
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- 19 Mar, 2017 12 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimmLinus Torvalds authored
Pull device-dax fixes from Dan Williams: "The device-dax driver was not being careful to handle falling back to smaller fault-granularity sizes. The driver already fails fault attempts that are smaller than the device's alignment, but it also needs to handle the cases where a larger page mapping could be established. For simplicity of the immediate fix the implementation just signals VM_FAULT_FALLBACK until fault-size == device-alignment. One fix is for -stable to address pmd-to-pte fallback from the original implementation, another fix is for the new (introduced in 4.11-rc1) pud-to-pmd regression, and a typo fix comes along for the ride. These have received a build success notification from the kbuild robot" * 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: device-dax: fix debug output typo device-dax: fix pud fault fallback handling device-dax: fix pmd/pte fault fallback handling
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Himanshu Madhani authored
Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> signed-off-by:
Giridhar Malavali <giridhar.malavali@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Quinn Tran authored
Current driver wait for FW to be in the ready state before processing in-coming commands. For Arbitrated Loop or Point-to- Point (not switch), FW Ready state can take a while. FW will transition to ready state after all Nports have been logged in. In the mean time, certain initiators have completed the login and starts IO. Driver needs to start processing all queues if FW is already started. Signed-off-by:
Quinn Tran <quinn.tran@cavium.com> Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Quinn Tran authored
For target mode, when new scsi command arrive, driver first performs a look up of the SCSI Host. The current look up method is based on the ALPA portion of the NPort ID. For Cisco switch, the ALPA can not be used as the index. Instead, the new search method is based on the full value of the Nport_ID via btree lib. Signed-off-by:
Quinn Tran <quinn.tran@cavium.com> Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Himanshu Madhani authored
Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Giridhar Malavali <giridhar.malavali@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Quinn Tran authored
The Mailbox interface is currently over subscribed. We like to reserve the Mailbox interface for the chip managment and link initialization. Any non essential Mailbox command will be routed through the IOCB interface. The IOCB interface is able to absorb more commands. Following commands are being routed through IOCB interface - Get ID List (007Ch) - Get Port DB (0064h) - Get Link Priv Stats (006Dh) Signed-off-by:
Quinn Tran <quinn.tran@cavium.com> Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Quinn Tran authored
Signed-off-by:
Quinn Tran <quinn.tran@cavium.com> Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Anil Gurumurthy authored
Signed-off-by:
Anil Gurumurthy <anil.gurumurthy@cavium.com> Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Quinn Tran authored
Add routines to support T10 DIF tag. Signed-off-by:
Quinn Tran <quinn.tran@cavium.com> Signed-off-by:
Anil Gurumurthy <anil.gurumurthy@cavium.com> Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Quinn Tran authored
If the remote port have started the login process, then the PLOGI and PRLI should be back to back. Driver will allow the remote port to complete the process. For the case where the remote port decide to back off from sending PRLI, this local port sets an expiration timer for the PRLI. Once the expiration time passes, the relogin retry logic is allowed to go through and perform login with the remote port. Signed-off-by:
Quinn Tran <quinn.tran@qlogic.com> Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Quinn Tran authored
The main lock that needs to be held for CMD or TMR submission to upper layer is the sess_lock. The sess_lock is used to serialize cmd submission and session deletion. The addition of hardware_lock being held is not necessary. This patch removes hardware_lock dependency from CMD/TMR submission. Use hardware_lock only for error response in this case. Path1 CPU0 CPU1 ---- ---- lock(&(&ha->tgt.sess_lock)->rlock); lock(&(&ha->hardware_lock)->rlock); lock(&(&ha->tgt.sess_lock)->rlock); lock(&(&ha->hardware_lock)->rlock); Path2/deadlock *** DEADLOCK *** Call Trace: dump_stack+0x85/0xc2 print_circular_bug+0x1e3/0x250 __lock_acquire+0x1425/0x1620 lock_acquire+0xbf/0x210 _raw_spin_lock_irqsave+0x53/0x70 qlt_sess_work_fn+0x21d/0x480 [qla2xxx] process_one_work+0x1f4/0x6e0 Cc: <stable@vger.kernel.org> Cc: Bart Van Assche <Bart.VanAssche@sandisk.com> Reported-by:
Bart Van Assche <Bart.VanAssche@sandisk.com> Signed-off-by:
Quinn Tran <quinn.tran@cavium.com> Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Quinn Tran authored
Normally, ABTS is sent to Target Core as Task MGMT command. In the case of error, qla2xxx needs to send response, hardware_lock is required to prevent request queue corruption. Cc: <stable@vger.kernel.org> Signed-off-by:
Quinn Tran <quinn.tran@cavium.com> Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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