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2018-09-15block: bvec_nr_vecs() returns value for wrong slabGreg Edwards
[ Upstream commit d6c02a9beb67f13d5f14f23e72fa9981e8b84477 ] In commit ed996a52c868 ("block: simplify and cleanup bvec pool handling"), the value of the slab index is incremented by one in bvec_alloc() after the allocation is done to indicate an index value of 0 does not need to be later freed. bvec_nr_vecs() was not updated accordingly, and thus returns the wrong value. Decrement idx before performing the lookup. Fixes: ed996a52c868 ("block: simplify and cleanup bvec pool handling") Signed-off-by: Greg Edwards <gedwards@ddn.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-09-09block, bfq: return nbytes and not zero from struct cftype .write() methodMaciej S. Szmigiero
commit fc8ebd01deeb12728c83381f6ec923e4a192ffd3 upstream. The value that struct cftype .write() method returns is then directly returned to userspace as the value returned by write() syscall, so it should be the number of bytes actually written (or consumed) and not zero. Returning zero from write() syscall makes programs like /bin/echo or bash spin. Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name> Fixes: e21b7a0b9887 ("block, bfq: add full hierarchical scheduling and cgroups support") Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-09-09block: really disable runtime-pm for blk-mqMing Lei
commit b233f127042dba991229e3882c6217c80492f6ef upstream. Runtime PM isn't ready for blk-mq yet, and commit 765e40b675a9 ("block: disable runtime-pm for blk-mq") tried to disable it. Unfortunately, it can't take effect in that way since user space still can switch it on via 'echo auto > /sys/block/sdN/device/power/control'. This patch disables runtime-pm for blk-mq really by pm_runtime_disable() and fixes all kinds of PM related kernel crash. Cc: Tomas Janousek <tomi@nomi.cz> Cc: Przemek Socha <soprwa@gmail.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: <stable@vger.kernel.org> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Tested-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-09-09block: blk_init_allocated_queue() set q->fq as NULL in the fail casexiao jin
commit 54648cf1ec2d7f4b6a71767799c45676a138ca24 upstream. We find the memory use-after-free issue in __blk_drain_queue() on the kernel 4.14. After read the latest kernel 4.18-rc6 we think it has the same problem. Memory is allocated for q->fq in the blk_init_allocated_queue(). If the elevator init function called with error return, it will run into the fail case to free the q->fq. Then the __blk_drain_queue() uses the same memory after the free of the q->fq, it will lead to the unpredictable event. The patch is to set q->fq as NULL in the fail case of blk_init_allocated_queue(). Fixes: commit 7c94e1c157a2 ("block: introduce blk_flush_queue to drive flush machinery") Cc: <stable@vger.kernel.org> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: xiao jin <jin.xiao@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-24block: sed-opal: Fix a couple off by one bugsDan Carpenter
[ Upstream commit ce042c183bcb94eb2919e8036473a1fc203420f9 ] resp->num is the number of tokens in resp->tok[]. It gets set in response_parse(). So if n == resp->num then we're reading beyond the end of the data. Fixes: 455a7b238cd6 ("block: Add Sed-opal library") Reviewed-by: Scott Bauer <scott.bauer@intel.com> Tested-by: Scott Bauer <scott.bauer@intel.com> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-17block, bfq: fix wrong init of saved start time for weight raisingPaolo Valente
commit 4baa8bb13f41307f3eb62fe91f93a1a798ebef53 upstream. This commit fixes a bug that causes bfq to fail to guarantee a high responsiveness on some drives, if there is heavy random read+write I/O in the background. More precisely, such a failure allowed this bug to be found [1], but the bug may well cause other yet unreported anomalies. BFQ raises the weight of the bfq_queues associated with soft real-time applications, to privilege the I/O, and thus reduce latency, for these applications. This mechanism is named soft-real-time weight raising in BFQ. A soft real-time period may happen to be nested into an interactive weight raising period, i.e., it may happen that, when a bfq_queue switches to a soft real-time weight-raised state, the bfq_queue is already being weight-raised because deemed interactive too. In this case, BFQ saves in a special variable wr_start_at_switch_to_srt, the time instant when the interactive weight-raising period started for the bfq_queue, i.e., the time instant when BFQ started to deem the bfq_queue interactive. This value is then used to check whether the interactive weight-raising period would still be in progress when the soft real-time weight-raising period ends. If so, interactive weight raising is restored for the bfq_queue. This restore is useful, in particular, because it prevents bfq_queues from losing their interactive weight raising prematurely, as a consequence of spurious, short-lived soft real-time weight-raising periods caused by wrong detections as soft real-time. If, instead, a bfq_queue switches to soft-real-time weight raising while it *is not* already in an interactive weight-raising period, then the variable wr_start_at_switch_to_srt has no meaning during the following soft real-time weight-raising period. Unfortunately the handling of this case is wrong in BFQ: not only the variable is not flagged somehow as meaningless, but it is also set to the time when the switch to soft real-time weight-raising occurs. This may cause an interactive weight-raising period to be considered mistakenly as still in progress, and thus a spurious interactive weight-raising period to start for the bfq_queue, at the end of the soft-real-time weight-raising period. In particular the spurious interactive weight-raising period will be considered as still in progress, if the soft-real-time weight-raising period does not last very long. The bfq_queue will then be wrongly privileged and, if I/O bound, will unjustly steal bandwidth to truly interactive or soft real-time bfq_queues, harming responsiveness and low latency. This commit fixes this issue by just setting wr_start_at_switch_to_srt to minus infinity (farthest past time instant according to jiffies macros): when the soft-real-time weight-raising period ends, certainly no interactive weight-raising period will be considered as still in progress. [1] Background I/O Type: Random - Background I/O mix: Reads and writes - Application to start: LibreOffice Writer in http://www.phoronix.com/scan.php?page=news_item&px=Linux-4.13-IO-Laptop Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Angelo Ruocco <angeloruocco90@gmail.com> Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name> Tested-by: Lee Tibbert <lee.tibbert@gmail.com> Tested-by: Mirko Montanari <mirkomontanari91@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-03block: reset bi_iter.bi_done after splitting bioGreg Edwards
commit 5151842b9d8732d4cbfa8400b40bff894f501b2f upstream. After the bio has been updated to represent the remaining sectors, reset bi_done so bio_rewind_iter() does not rewind further than it should. This resolves a bio_integrity_process() failure on reads where the original request was split. Fixes: 63573e359d05 ("bio-integrity: Restore original iterator on verify stage") Signed-off-by: Greg Edwards <gedwards@ddn.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-03block: bio_iov_iter_get_pages: fix size of last iovecMartin Wilck
commit b403ea2404889e1227812fa9657667a1deb9c694 upstream. If the last page of the bio is not "full", the length of the last vector slot needs to be corrected. This slot has the index (bio->bi_vcnt - 1), but only in bio->bi_io_vec. In the "bv" helper array, which is shifted by the value of bio->bi_vcnt at function invocation, the correct index is (nr_pages - 1). v2: improved readability following suggestions from Ming Lei. v3: followed a formatting suggestion from Christoph Hellwig. Fixes: 2cefe4dbaadf ("block: add bio_iov_iter_get_pages()") Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin Wilck <mwilck@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-03block, bfq: remove wrong lock in bfq_requests_mergedFilippo Muzzini
[ Upstream commit a12bffebc0c9d6a5851f062aaea3aa7c4adc6042 ] In bfq_requests_merged(), there is a deadlock because the lock on bfqq->bfqd->lock is held by the calling function, but the code of this function tries to grab the lock again. This deadlock is currently hidden by another bug (fixed by next commit for this source file), which causes the body of bfq_requests_merged() to be never executed. This commit removes the deadlock by removing the lock/unlock pair. Signed-off-by: Filippo Muzzini <filippo.muzzini@outlook.it> Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-07-22block: do not use interruptible wait anywhereAlan Jenkins
commit 1dc3039bc87ae7d19a990c3ee71cfd8a9068f428 upstream. When blk_queue_enter() waits for a queue to unfreeze, or unset the PREEMPT_ONLY flag, do not allow it to be interrupted by a signal. The PREEMPT_ONLY flag was introduced later in commit 3a0a529971ec ("block, scsi: Make SCSI quiesce and resume work reliably"). Note the SCSI device is resumed asynchronously, i.e. after un-freezing userspace tasks. So that commit exposed the bug as a regression in v4.15. A mysterious SIGBUS (or -EIO) sometimes happened during the time the device was being resumed. Most frequently, there was no kernel log message, and we saw Xorg or Xwayland killed by SIGBUS.[1] [1] E.g. https://bugzilla.redhat.com/show_bug.cgi?id=1553979 Without this fix, I get an IO error in this test: # dd if=/dev/sda of=/dev/null iflag=direct & \ while killall -SIGUSR1 dd; do sleep 0.1; done & \ echo mem > /sys/power/state ; \ sleep 5; killall dd # stop after 5 seconds The interruptible wait was added to blk_queue_enter in commit 3ef28e83ab15 ("block: generic request_queue reference counting"). Before then, the interruptible wait was only in blk-mq, but I don't think it could ever have been correct. Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: stable@vger.kernel.org Signed-off-by: Alan Jenkins <alan.christopher.jenkins@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-07-11block: cope with WRITE ZEROES failing in blkdev_issue_zeroout()Ilya Dryomov
commit d5ce4c31d6df518dd8f63bbae20d7423c5018a6c upstream. sd_config_write_same() ignores ->max_ws_blocks == 0 and resets it to permit trying WRITE SAME on older SCSI devices, unless ->no_write_same is set. Because REQ_OP_WRITE_ZEROES is implemented in terms of WRITE SAME, blkdev_issue_zeroout() may fail with -EREMOTEIO: $ fallocate -zn -l 1k /dev/sdg fallocate: fallocate failed: Remote I/O error $ fallocate -zn -l 1k /dev/sdg # OK $ fallocate -zn -l 1k /dev/sdg # OK The following calls succeed because sd_done() sets ->no_write_same in response to a sense that would become BLK_STS_TARGET/-EREMOTEIO, causing __blkdev_issue_zeroout() to fall back to generating ZERO_PAGE bios. This means blkdev_issue_zeroout() must cope with WRITE ZEROES failing and fall back to manually zeroing, unless BLKDEV_ZERO_NOFALLBACK is specified. For BLKDEV_ZERO_NOFALLBACK case, return -EOPNOTSUPP if sd_done() has just set ->no_write_same thus indicating lack of offload support. Fixes: c20cfc27a473 ("block: stop using blkdev_issue_write_same for zeroing") Cc: Hannes Reinecke <hare@suse.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Cc: Janne Huttunen <janne.huttunen@nokia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-07-11block: factor out __blkdev_issue_zero_pages()Ilya Dryomov
commit 425a4dba7953e35ffd096771973add6d2f40d2ed upstream. blkdev_issue_zeroout() will use this in !BLKDEV_ZERO_NOFALLBACK case. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Cc: Janne Huttunen <janne.huttunen@nokia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-07-03block: Fix cloning of requests with a special payloadBart Van Assche
commit 297ba57dcdec7ea37e702bcf1a577ac32a034e21 upstream. This patch avoids that removing a path controlled by the dm-mpath driver while mkfs is running triggers the following kernel bug: kernel BUG at block/blk-core.c:3347! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 20 PID: 24369 Comm: mkfs.ext4 Not tainted 4.18.0-rc1-dbg+ #2 RIP: 0010:blk_end_request_all+0x68/0x70 Call Trace: <IRQ> dm_softirq_done+0x326/0x3d0 [dm_mod] blk_done_softirq+0x19b/0x1e0 __do_softirq+0x128/0x60d irq_exit+0x100/0x110 smp_call_function_single_interrupt+0x90/0x330 call_function_single_interrupt+0xf/0x20 </IRQ> Fixes: f9d03f96b988 ("block: improve handling of the magic discard payload") Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Cc: <stable@vger.kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-06-26blk-mq: reinit q->tag_set_list entry only after grace periodRoman Pen
commit a347c7ad8edf4c5685154f3fdc3c12fc1db800ba upstream. It is not allowed to reinit q->tag_set_list list entry while RCU grace period has not completed yet, otherwise the following soft lockup in blk_mq_sched_restart() happens: [ 1064.252652] watchdog: BUG: soft lockup - CPU#12 stuck for 23s! [fio:9270] [ 1064.254445] task: ffff99b912e8b900 task.stack: ffffa6d54c758000 [ 1064.254613] RIP: 0010:blk_mq_sched_restart+0x96/0x150 [ 1064.256510] Call Trace: [ 1064.256664] <IRQ> [ 1064.256824] blk_mq_free_request+0xea/0x100 [ 1064.256987] msg_io_conf+0x59/0xd0 [ibnbd_client] [ 1064.257175] complete_rdma_req+0xf2/0x230 [ibtrs_client] [ 1064.257340] ? ibtrs_post_recv_empty+0x4d/0x70 [ibtrs_core] [ 1064.257502] ibtrs_clt_rdma_done+0xd1/0x1e0 [ibtrs_client] [ 1064.257669] ib_create_qp+0x321/0x380 [ib_core] [ 1064.257841] ib_process_cq_direct+0xbd/0x120 [ib_core] [ 1064.258007] irq_poll_softirq+0xb7/0xe0 [ 1064.258165] __do_softirq+0x106/0x2a2 [ 1064.258328] irq_exit+0x92/0xa0 [ 1064.258509] do_IRQ+0x4a/0xd0 [ 1064.258660] common_interrupt+0x7a/0x7a [ 1064.258818] </IRQ> Meanwhile another context frees other queue but with the same set of shared tags: [ 1288.201183] INFO: task bash:5910 blocked for more than 180 seconds. [ 1288.201833] bash D 0 5910 5820 0x00000000 [ 1288.202016] Call Trace: [ 1288.202315] schedule+0x32/0x80 [ 1288.202462] schedule_timeout+0x1e5/0x380 [ 1288.203838] wait_for_completion+0xb0/0x120 [ 1288.204137] __wait_rcu_gp+0x125/0x160 [ 1288.204287] synchronize_sched+0x6e/0x80 [ 1288.204770] blk_mq_free_queue+0x74/0xe0 [ 1288.204922] blk_cleanup_queue+0xc7/0x110 [ 1288.205073] ibnbd_clt_unmap_device+0x1bc/0x280 [ibnbd_client] [ 1288.205389] ibnbd_clt_unmap_dev_store+0x169/0x1f0 [ibnbd_client] [ 1288.205548] kernfs_fop_write+0x109/0x180 [ 1288.206328] vfs_write+0xb3/0x1a0 [ 1288.206476] SyS_write+0x52/0xc0 [ 1288.206624] do_syscall_64+0x68/0x1d0 [ 1288.206774] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 What happened is the following: 1. There are several MQ queues with shared tags. 2. One queue is about to be freed and now task is in blk_mq_del_queue_tag_set(). 3. Other CPU is in blk_mq_sched_restart() and loops over all queues in tag list in order to find hctx to restart. Because linked list entry was modified in blk_mq_del_queue_tag_set() without proper waiting for a grace period, blk_mq_sched_restart() never ends, spining in list_for_each_entry_rcu_rr(), thus soft lockup. Fix is simple: reinit list entry after an RCU grace period elapsed. Fixes: Fixes: 705cda97ee3a ("blk-mq: Make it safe to use RCU to iterate over blk_mq_tag_set.tag_list") Cc: stable@vger.kernel.org Cc: Sagi Grimberg <sagi@grimberg.me> Cc: linux-block@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-06-21blk-mq: fix sysfs inflight counterOmar Sandoval
[ Upstream commit bf0ddaba65ddbb2715af97041da8e7a45b2d8628 ] When the blk-mq inflight implementation was added, /proc/diskstats was converted to use it, but /sys/block/$dev/inflight was not. Fix it by adding another helper to count in-flight requests by data direction. Fixes: f299b7c7a9de ("blk-mq: provide internal in-flight variant") Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-06-21blkcg: init root blkcg_gq under lockJiang Biao
[ Upstream commit 901932a3f9b2b80352896be946c6d577c0a9652c ] The initializing of q->root_blkg is currently outside of queue lock and rcu, so the blkg may be destroied before the initializing, which may cause dangling/null references. On the other side, the destroys of blkg are protected by queue lock or rcu. Put the initializing inside the queue lock and rcu to make it safer. Signed-off-by: Jiang Biao <jiang.biao2@zte.com.cn> Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> CC: Tejun Heo <tj@kernel.org> CC: Jens Axboe <axboe@kernel.dk> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-06-21blkcg: don't hold blkcg lock when deactivating policyJiang Biao
[ Upstream commit 946b81da114b8ba5c74bb01e57c0c6eca2bdc801 ] As described in the comment of blkcg_activate_policy(), *Update of each blkg is protected by both queue and blkcg locks so that holding either lock and testing blkcg_policy_enabled() is always enough for dereferencing policy data.* with queue lock held, there is no need to hold blkcg lock in blkcg_deactivate_policy(). Similar case is in blkcg_activate_policy(), which has removed holding of blkcg lock in commit 4c55f4f9ad3001ac1fefdd8d8ca7641d18558e23. Signed-off-by: Jiang Biao <jiang.biao2@zte.com.cn> Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> CC: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-06-16blkdev_report_zones_ioctl(): Use vmalloc() to allocate large buffersBart Van Assche
commit 327ea4adcfa37194739f1ec7c70568944d292281 upstream. Avoid that complaints similar to the following appear in the kernel log if the number of zones is sufficiently large: fio: page allocation failure: order:9, mode:0x140c0c0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null) Call Trace: dump_stack+0x63/0x88 warn_alloc+0xf5/0x190 __alloc_pages_slowpath+0x8f0/0xb0d __alloc_pages_nodemask+0x242/0x260 alloc_pages_current+0x6a/0xb0 kmalloc_order+0x18/0x50 kmalloc_order_trace+0x26/0xb0 __kmalloc+0x20e/0x220 blkdev_report_zones_ioctl+0xa5/0x1a0 blkdev_ioctl+0x1ba/0x930 block_ioctl+0x41/0x50 do_vfs_ioctl+0xaa/0x610 SyS_ioctl+0x79/0x90 do_syscall_64+0x79/0x1b0 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Fixes: 3ed05a987e0f ("blk-zoned: implement ioctls") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Shaun Tancheff <shaun.tancheff@seagate.com> Cc: Damien Le Moal <damien.lemoal@hgst.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Hannes Reinecke <hare@suse.com> Cc: <stable@vger.kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-05-30block: display the correct diskname for bioJiufei Xue
[ Upstream commit 9c0fb1e313aaf4e8edec22433c8b22dd308e466c ] bio_devname use __bdevname to display the device name, and can only show the major and minor of the part0, Fix this by using disk_name to display the correct name. Fixes: 74d46992e0d9 ("block: replace bi_bdev with a gendisk pointer and partitions index") Reviewed-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jiufei Xue <jiufei.xue@linux.alibaba.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-05-01bfq-iosched: ensure to clear bic/bfqq pointers when preparing requestJens Axboe
commit 72961c4e6082be79825265d9193272b8a1634dec upstream. Even if we don't have an IO context attached to a request, we still need to clear the priv[0..1] pointers, as they could be pointing to previously used bic/bfqq structures. If we don't do so, we'll either corrupt memory on dispatching a request, or cause an imbalance in counters. Inspired by a fix from Kees. Reported-by: Oleksandr Natalenko <oleksandr@natalenko.name> Reported-by: Kees Cook <keescook@chromium.org> Cc: stable@vger.kernel.org Fixes: aee69d78dec0 ("block, bfq: introduce the BFQ-v0 I/O scheduler as an extra scheduler") Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-26blk-mq: fix discard merge with scheduler attachedJens Axboe
[ Upstream commit 445251d0f4d329aa061f323546cd6388a3bb7ab5 ] I ran into an issue on my laptop that triggered a bug on the discard path: WARNING: CPU: 2 PID: 207 at drivers/nvme/host/core.c:527 nvme_setup_cmd+0x3d3/0x430 Modules linked in: rfcomm fuse ctr ccm bnep arc4 binfmt_misc snd_hda_codec_hdmi nls_iso8859_1 nls_cp437 vfat snd_hda_codec_conexant fat snd_hda_codec_generic iwlmvm snd_hda_intel snd_hda_codec snd_hwdep mac80211 snd_hda_core snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq x86_pkg_temp_thermal intel_powerclamp kvm_intel uvcvideo iwlwifi btusb snd_seq_device videobuf2_vmalloc btintel videobuf2_memops kvm snd_timer videobuf2_v4l2 bluetooth irqbypass videobuf2_core aesni_intel aes_x86_64 crypto_simd cryptd snd glue_helper videodev cfg80211 ecdh_generic soundcore hid_generic usbhid hid i915 psmouse e1000e ptp pps_core xhci_pci xhci_hcd intel_gtt CPU: 2 PID: 207 Comm: jbd2/nvme0n1p7- Tainted: G U 4.15.0+ #176 Hardware name: LENOVO 20FBCTO1WW/20FBCTO1WW, BIOS N1FET59W (1.33 ) 12/19/2017 RIP: 0010:nvme_setup_cmd+0x3d3/0x430 RSP: 0018:ffff880423e9f838 EFLAGS: 00010217 RAX: 0000000000000000 RBX: ffff880423e9f8c8 RCX: 0000000000010000 RDX: ffff88022b200010 RSI: 0000000000000002 RDI: 00000000327f0000 RBP: ffff880421251400 R08: ffff88022b200000 R09: 0000000000000009 R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000ffff R13: ffff88042341e280 R14: 000000000000ffff R15: ffff880421251440 FS: 0000000000000000(0000) GS:ffff880441500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b684795030 CR3: 0000000002e09006 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nvme_queue_rq+0x40/0xa00 ? __sbitmap_queue_get+0x24/0x90 ? blk_mq_get_tag+0xa3/0x250 ? wait_woken+0x80/0x80 ? blk_mq_get_driver_tag+0x97/0xf0 blk_mq_dispatch_rq_list+0x7b/0x4a0 ? deadline_remove_request+0x49/0xb0 blk_mq_do_dispatch_sched+0x4f/0xc0 blk_mq_sched_dispatch_requests+0x106/0x170 __blk_mq_run_hw_queue+0x53/0xa0 __blk_mq_delay_run_hw_queue+0x83/0xa0 blk_mq_run_hw_queue+0x6c/0xd0 blk_mq_sched_insert_request+0x96/0x140 __blk_mq_try_issue_directly+0x3d/0x190 blk_mq_try_issue_directly+0x30/0x70 blk_mq_make_request+0x1a4/0x6a0 generic_make_request+0xfd/0x2f0 ? submit_bio+0x5c/0x110 submit_bio+0x5c/0x110 ? __blkdev_issue_discard+0x152/0x200 submit_bio_wait+0x43/0x60 ext4_process_freed_data+0x1cd/0x440 ? account_page_dirtied+0xe2/0x1a0 ext4_journal_commit_callback+0x4a/0xc0 jbd2_journal_commit_transaction+0x17e2/0x19e0 ? kjournald2+0xb0/0x250 kjournald2+0xb0/0x250 ? wait_woken+0x80/0x80 ? commit_timeout+0x10/0x10 kthread+0x111/0x130 ? kthread_create_worker_on_cpu+0x50/0x50 ? do_group_exit+0x3a/0xa0 ret_from_fork+0x1f/0x30 Code: 73 89 c1 83 ce 10 c1 e1 10 09 ca 83 f8 04 0f 87 0f ff ff ff 8b 4d 20 48 8b 7d 00 c1 e9 09 48 01 8c c7 00 08 00 00 e9 f8 fe ff ff <0f> ff 4c 89 c7 41 bc 0a 00 00 00 e8 0d 78 d6 ff e9 a1 fc ff ff ---[ end trace 50d361cc444506c8 ]--- print_req_error: I/O error, dev nvme0n1, sector 847167488 Decoding the assembly, the request claims to have 0xffff segments, while nvme counts two. This turns out to be because we don't check for a data carrying request on the mq scheduler path, and since blk_phys_contig_segment() returns true for a non-data request, we decrement the initial segment count of 0 and end up with 0xffff in the unsigned short. There are a few issues here: 1) We should initialize the segment count for a discard to 1. 2) The discard merging is currently using the data limits for segments and sectors. Fix this up by having attempt_merge() correctly identify the request, and by initializing the segment count correctly for discards. This can only be triggered with mq-deadline on discard capable devices right now, which isn't a common configuration. Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-26blk-mq-debugfs: don't allow write on attributes with seq_operations setEryu Guan
[ Upstream commit 6b136a24b05c81a24e0b648a4bd938bcd0c4f69e ] Attributes that only implement .seq_ops are read-only, any write to them should be rejected. But currently kernel would crash when writing to such debugfs entries, e.g. chmod +w /sys/kernel/debug/block/<dev>/requeue_list echo 0 > /sys/kernel/debug/block/<dev>/requeue_list chmod -w /sys/kernel/debug/block/<dev>/requeue_list Fix it by returning -EPERM in blk_mq_debugfs_write() when writing to such attributes. Cc: Ming Lei <ming.lei@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-26block: Set BIO_TRACE_COMPLETION on new bio during splitGoldwyn Rodrigues
[ Upstream commit 20d59023c5ec4426284af492808bcea1f39787ef ] We inadvertently set it again on the source bio, but we need to set it on the new split bio instead. Fixes: fbbaf700e7b1 ("block: trace completion of all bios.") Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-26blk-mq: turn WARN_ON in __blk_mq_run_hw_queue into printkMing Lei
[ Upstream commit 7df938fbc4ee641e70e05002ac67c24b19e86e74 ] We know this WARN_ON is harmless and in reality it may be trigged, so convert it to printk() and dump_stack() to avoid to confusing people. Also add comment about two releated races here. Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Stefan Haberland <sth@linux.vnet.ibm.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "jianchao.wang" <jianchao.w.wang@oracle.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-19blk-mq: don't keep offline CPUs mapped to hctx 0Ming Lei
commit bffa9909a6b48d8ca3398dec601bc9162a4020c4 upstream. From commit 4b855ad37194 ("blk-mq: Create hctx for each present CPU), blk-mq doesn't remap queue after CPU topo is changed, that said when some of these offline CPUs become online, they are still mapped to hctx 0, then hctx 0 may become the bottleneck of IO dispatch and completion. This patch sets up the mapping from the beginning, and aligns to queue mapping for PCI device (blk_mq_pci_map_queues()). Cc: Stefan Haberland <sth@linux.vnet.ibm.com> Cc: Keith Busch <keith.busch@intel.com> Cc: stable@vger.kernel.org Fixes: 4b855ad37194 ("blk-mq: Create hctx for each present CPU) Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-12block, bfq: put async queues for root bfq groups tooPaolo Valente
[ Upstream commit 52257ffbfcaf58d247b13fb148e27ed17c33e526 ] For each pair [device for which bfq is selected as I/O scheduler, group in blkio/io], bfq maintains a corresponding bfq group. Each such bfq group contains a set of async queues, with each async queue created on demand, i.e., when some I/O request arrives for it. On creation, an async queue gets an extra reference, to make sure that the queue is not freed as long as its bfq group exists. Accordingly, to allow the queue to be freed after the group exited, this extra reference must released on group exit. The above holds also for a bfq root group, i.e., for the bfq group corresponding to the root blkio/io root for a given device. Yet, by mistake, the references to the existing async queues of a root group are not released when the latter exits. This causes a memory leak when the instance of bfq for a given device exits. In a similar vein, bfqg_stats_xfer_dead is not executed for a root group. This commit fixes bfq_pd_offline so that the latter executes the above missing operations for a root group too. Reported-by: Holger Hoffstätte <holger@applied-asynchrony.com> Reported-by: Guoqing Jiang <gqjiang@suse.com> Tested-by: Holger Hoffstätte <holger@applied-asynchrony.com> Signed-off-by: Davide Ferrari <davideferrari8@gmail.com> Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-12blk-mq: fix kernel oops in blk_mq_tag_idle()Ming Lei
[ Upstream commit 8ab0b7dc73e1b3e2987d42554b2bff503f692772 ] HW queues may be unmapped in some cases, such as blk_mq_update_nr_hw_queues(), then we need to check it before calling blk_mq_tag_idle(), otherwise the following kernel oops can be triggered, so fix it by checking if the hw queue is unmapped since it doesn't make sense to idle the tags any more after hw queues are unmapped. [ 440.771298] Workqueue: nvme-wq nvme_rdma_del_ctrl_work [nvme_rdma] [ 440.779104] task: ffff894bae755ee0 ti: ffff893bf9bc8000 task.ti: ffff893bf9bc8000 [ 440.788359] RIP: 0010:[<ffffffffb730e2b4>] [<ffffffffb730e2b4>] __blk_mq_tag_idle+0x24/0x40 [ 440.798697] RSP: 0018:ffff893bf9bcbd10 EFLAGS: 00010286 [ 440.805538] RAX: 0000000000000000 RBX: ffff895bb131dc00 RCX: 000000000000011f [ 440.814426] RDX: 00000000ffffffff RSI: 0000000000000120 RDI: ffff895bb131dc00 [ 440.823301] RBP: ffff893bf9bcbd10 R08: 000000000001b860 R09: 4a51d361c00c0000 [ 440.832193] R10: b5907f32b4cc7003 R11: ffffd6cabfb57000 R12: ffff894bafd1e008 [ 440.841091] R13: 0000000000000001 R14: ffff895baf770000 R15: 0000000000000080 [ 440.849988] FS: 0000000000000000(0000) GS:ffff894bbdcc0000(0000) knlGS:0000000000000000 [ 440.859955] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 440.867274] CR2: 0000000000000008 CR3: 000000103d098000 CR4: 00000000001407e0 [ 440.876169] Call Trace: [ 440.879818] [<ffffffffb7309d68>] blk_mq_exit_hctx+0xd8/0xe0 [ 440.887051] [<ffffffffb730dc40>] blk_mq_free_queue+0xf0/0x160 [ 440.894465] [<ffffffffb72ff679>] blk_cleanup_queue+0xd9/0x150 [ 440.901881] [<ffffffffc08a802b>] nvme_ns_remove+0x5b/0xb0 [nvme_core] [ 440.910068] [<ffffffffc08a811b>] nvme_remove_namespaces+0x3b/0x60 [nvme_core] [ 440.919026] [<ffffffffc08b817b>] __nvme_rdma_remove_ctrl+0x2b/0xb0 [nvme_rdma] [ 440.928079] [<ffffffffc08b8237>] nvme_rdma_del_ctrl_work+0x17/0x20 [nvme_rdma] [ 440.937126] [<ffffffffb70ab58a>] process_one_work+0x17a/0x440 [ 440.944517] [<ffffffffb70ac3a8>] worker_thread+0x278/0x3c0 [ 440.951607] [<ffffffffb70ac130>] ? manage_workers.isra.24+0x2a0/0x2a0 [ 440.959760] [<ffffffffb70b352f>] kthread+0xcf/0xe0 [ 440.966055] [<ffffffffb70b3460>] ? insert_kthread_work+0x40/0x40 [ 440.973715] [<ffffffffb76d8658>] ret_from_fork+0x58/0x90 [ 440.980586] [<ffffffffb70b3460>] ? insert_kthread_work+0x40/0x40 [ 440.988229] Code: 5b 41 5c 5d c3 66 90 0f 1f 44 00 00 48 8b 87 20 01 00 00 f0 0f ba 77 40 01 19 d2 85 d2 75 08 c3 0f 1f 80 00 00 00 00 55 48 89 e5 <f0> ff 48 08 48 8d 78 10 e8 7f 0f 05 00 5d c3 0f 1f 00 66 2e 0f [ 441.011620] RIP [<ffffffffb730e2b4>] __blk_mq_tag_idle+0x24/0x40 [ 441.019301] RSP <ffff893bf9bcbd10> [ 441.024052] CR2: 0000000000000008 Reported-by: Zhang Yi <yizhan@redhat.com> Tested-by: Zhang Yi <yizhan@redhat.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-12blk-mq: fix race between updating nr_hw_queues and switching io schedMing Lei
[ Upstream commit fb350e0ad99359768e1e80b4784692031ec340e4 ] In both elevator_switch_mq() and blk_mq_update_nr_hw_queues(), sched tags can be allocated, and q->nr_hw_queue is used, and race is inevitable, for example: blk_mq_init_sched() may trigger use-after-free on hctx, which is freed in blk_mq_realloc_hw_ctxs() when nr_hw_queues is decreased. This patch fixes the race be holding q->sysfs_lock. Reviewed-by: Christoph Hellwig <hch@lst.de> Reported-by: Yi Zhang <yi.zhang@redhat.com> Tested-by: Yi Zhang <yi.zhang@redhat.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-12blk-mq: avoid to map CPU into stale hw queueMing Lei
[ Upstream commit 7d4901a90d02500c8011472a060f9b2e60e6e605 ] blk_mq_pci_map_queues() may not map one CPU into any hw queue, but its previous map isn't cleared yet, and may point to one stale hw queue index. This patch fixes the following issue by clearing the mapping table before setting it up in blk_mq_pci_map_queues(). This patches fixes this following issue reported by Zhang Yi: [ 101.202734] BUG: unable to handle kernel NULL pointer dereference at 0000000094d3013f [ 101.211487] IP: blk_mq_map_swqueue+0xbc/0x200 [ 101.216346] PGD 0 P4D 0 [ 101.219171] Oops: 0000 [#1] SMP [ 101.222674] Modules linked in: sunrpc ipmi_ssif vfat fat intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel intel_cstate intel_uncore mxm_wmi intel_rapl_perf iTCO_wdt ipmi_si ipmi_devintf pcspkr iTCO_vendor_support sg dcdbas ipmi_msghandler wmi mei_me lpc_ich shpchp mei acpi_power_meter dm_multipath ip_tables xfs libcrc32c sd_mod mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm ahci libahci crc32c_intel libata tg3 nvme nvme_core megaraid_sas ptp i2c_core pps_core dm_mirror dm_region_hash dm_log dm_mod [ 101.284881] CPU: 0 PID: 504 Comm: kworker/u25:5 Not tainted 4.15.0-rc2 #1 [ 101.292455] Hardware name: Dell Inc. PowerEdge R730xd/072T6D, BIOS 2.5.5 08/16/2017 [ 101.301001] Workqueue: nvme-wq nvme_reset_work [nvme] [ 101.306636] task: 00000000f2c53190 task.stack: 000000002da874f9 [ 101.313241] RIP: 0010:blk_mq_map_swqueue+0xbc/0x200 [ 101.318681] RSP: 0018:ffffc9000234fd70 EFLAGS: 00010282 [ 101.324511] RAX: ffff88047ffc9480 RBX: ffff88047e130850 RCX: 0000000000000000 [ 101.332471] RDX: ffffe8ffffd40580 RSI: ffff88047e509b40 RDI: ffff88046f37a008 [ 101.340432] RBP: 000000000000000b R08: ffff88046f37a008 R09: 0000000011f94280 [ 101.348392] R10: ffff88047ffd4d00 R11: 0000000000000000 R12: ffff88046f37a008 [ 101.356353] R13: ffff88047e130f38 R14: 000000000000000b R15: ffff88046f37a558 [ 101.364314] FS: 0000000000000000(0000) GS:ffff880277c00000(0000) knlGS:0000000000000000 [ 101.373342] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 101.379753] CR2: 0000000000000098 CR3: 000000047f409004 CR4: 00000000001606f0 [ 101.387714] Call Trace: [ 101.390445] blk_mq_update_nr_hw_queues+0xbf/0x130 [ 101.395791] nvme_reset_work+0x6f4/0xc06 [nvme] [ 101.400848] ? pick_next_task_fair+0x290/0x5f0 [ 101.405807] ? __switch_to+0x1f5/0x430 [ 101.409988] ? put_prev_entity+0x2f/0xd0 [ 101.414365] process_one_work+0x141/0x340 [ 101.418836] worker_thread+0x47/0x3e0 [ 101.422921] kthread+0xf5/0x130 [ 101.426424] ? rescuer_thread+0x380/0x380 [ 101.430896] ? kthread_associate_blkcg+0x90/0x90 [ 101.436048] ret_from_fork+0x1f/0x30 [ 101.440034] Code: 48 83 3c ca 00 0f 84 2b 01 00 00 48 63 cd 48 8b 93 10 01 00 00 8b 0c 88 48 8b 83 20 01 00 00 4a 03 14 f5 60 04 af 81 48 8b 0c c8 <48> 8b 81 98 00 00 00 f0 4c 0f ab 30 8b 81 f8 00 00 00 89 42 44 [ 101.461116] RIP: blk_mq_map_swqueue+0xbc/0x200 RSP: ffffc9000234fd70 [ 101.468205] CR2: 0000000000000098 [ 101.471907] ---[ end trace 5fe710f98228a3ca ]--- [ 101.482489] Kernel panic - not syncing: Fatal exception [ 101.488505] Kernel Offset: disabled [ 101.497752] ---[ end Kernel panic - not syncing: Fatal exception Reviewed-by: Christoph Hellwig <hch@lst.de> Suggested-by: Christoph Hellwig <hch@lst.de> Reported-by: Yi Zhang <yi.zhang@redhat.com> Tested-by: Yi Zhang <yi.zhang@redhat.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-08Fix slab name "biovec-(1<<(21-12))"Mikulas Patocka
commit bd5c4facf59648581d2f1692dad7b107bf429954 upstream. I'm getting a slab named "biovec-(1<<(21-12))". It is caused by unintended expansion of the macro BIO_MAX_PAGES. This patch renames it to biovec-max. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-08partitions/msdos: Unable to mount UFS 44bsd partitionsRichard Narron
commit 5f15684bd5e5ef39d4337988864fec8012471dda upstream. UFS partitions from newer versions of FreeBSD 10 and 11 use relative addressing for their subpartitions. But older versions of FreeBSD still use absolute addressing just like OpenBSD and NetBSD. Instead of simply testing for a FreeBSD partition, the code needs to also test if the starting offset of the C subpartition is zero. https://bugzilla.kernel.org/show_bug.cgi?id=197733 Signed-off-by: Richard Narron <comet.berkeley@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-08blk-mq: don't call io sched's .requeue_request when requeueing rq to ->dispatchMing Lei
commit 105976f517791aed3b11f8f53b308a2069d42055 upstream. __blk_mq_requeue_request() covers two cases: - one is that the requeued request is added to hctx->dispatch, such as blk_mq_dispatch_rq_list() - another case is that the request is requeued to io scheduler, such as blk_mq_requeue_request(). We should call io sched's .requeue_request callback only for the 2nd case. Cc: Paolo Valente <paolo.valente@linaro.org> Cc: Omar Sandoval <osandov@fb.com> Fixes: bd166ef183c2 ("blk-mq-sched: add framework for MQ capable IO schedulers") Cc: stable@vger.kernel.org Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Acked-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-08block: kyber: fix domain token leak during requeueMing Lei
commit ba989a01469d027861e55c8f1121edadef757797 upstream. When requeuing request, the domain token should have been freed before re-inserting the request to io scheduler. Otherwise, the assigned domain token will be leaked, and IO hang can be caused. Cc: Paolo Valente <paolo.valente@linaro.org> Cc: Omar Sandoval <osandov@fb.com> Cc: stable@vger.kernel.org Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-08block: fix the count of PGPGOUT for WRITE_SAMEJiufei Xue
commit 7c5a0dcf557c6511a61e092ba887de28882fe857 upstream. The vm counters is counted in sectors, so we should do the conversation in submit_bio. Fixes: 74d46992e0d9 ("block: replace bi_bdev with a gendisk pointer and partitions index") Cc: stable@vger.kernel.org Reviewed-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jiufei Xue <jiufei.xue@linux.alibaba.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-03block: drain queue before waiting for q_usage_counter becoming zeroMing Lei
[ Upstream commit 454be724f6f99cc7e7bbf15067128be9868186c6 ] Now we track legacy requests with .q_usage_counter in commit 055f6e18e08f ("block: Make q_usage_counter also track legacy requests"), but that commit never runs and drains legacy queue before waiting for this counter becoming zero, then IO hang is caused in the test of pulling disk during IO. This patch fixes the issue by draining requests before waiting for q_usage_counter becoming zero, both Mauricio and chenxiang reported this issue, and observed that it can be fixed by this patch. Link: https://marc.info/?l=linux-block&m=151192424731797&w=2 Fixes: 055f6e18e08f("block: Make q_usage_counter also track legacy requests") Cc: Wen Xiong <wenxiong@us.ibm.com> Tested-by: "chenxiang (M)" <chenxiang66@hisilicon.com> Tested-by: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-02-25blk_rq_map_user_iov: fix error overrideDouglas Gilbert
commit 69e0927b3774563c19b5fb32e91d75edc147fb62 upstream. During stress tests by syzkaller on the sg driver the block layer infrequently returns EINVAL. Closer inspection shows the block layer was trying to return ENOMEM (which is much more understandable) but for some reason overroad that useful error. Patch below does not show this (unchanged) line: ret =__blk_rq_map_user_iov(rq, map_data, &i, gfp_mask, copy); That 'ret' was being overridden when that function failed. Signed-off-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-02-22blk-wbt: account flush requests correctlyJens Axboe
commit 5235553d821433e1f4fa720fd025d2c4b7ee9994 upstream. Mikulas reported a workload that saw bad performance, and figured out what it was due to various other types of requests being accounted as reads. Flush requests, for instance. Due to the high latency of those, we heavily throttle the writes to keep the latencies in balance. But they really should be accounted as writes. Fix this by checking the exact type of the request. If it's a read, account as a read, if it's a write or a flush, account as a write. Any other request we disregard. Previously everything would have been mistakenly accounted as reads. Reported-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@vger.kernel.org # v4.12+ Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-02-16blk-mq: quiesce queue before freeing queueMing Lei
commit c2856ae2f315d754a0b6a268e4c6745b332b42e7 upstream. After queue is frozen, dispatch still may happen, for example: 1) requests are submitted from several contexts 2) requests from all these contexts are inserted to queue, but may dispatch to LLD in one of these paths, but other paths sill need to move on even all these requests are completed(that means blk_mq_freeze_queue_wait() returns at that time) 3) dispatch after queue freezing still moves on and causes use-after-free, because request queue is freed This patch quiesces queue after it is frozen, and makes sure all in-progress dispatch are completed. This patch fixes the following kernel crash when running heavy IOs vs. deleting device: [ 36.719251] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 [ 36.720318] IP: kyber_has_work+0x14/0x40 [ 36.720847] PGD 254bf5067 P4D 254bf5067 PUD 255e6a067 PMD 0 [ 36.721584] Oops: 0000 [#1] PREEMPT SMP [ 36.722105] Dumping ftrace buffer: [ 36.722570] (ftrace buffer empty) [ 36.723057] Modules linked in: scsi_debug ebtable_filter ebtables ip6table_filter ip6_tables tcm_loop iscsi_target_mod target_core_file target_core_iblock target_core_pscsi target_core_mod xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack libcrc32c bridge stp llc fuse iptable_filter ip_tables sd_mod sg btrfs xor zstd_decompress zstd_compress xxhash raid6_pq mptsas mptscsih bcache crc32c_intel ahci mptbase libahci serio_raw scsi_transport_sas nvme libata shpchp lpc_ich virtio_scsi nvme_core binfmt_misc dm_mod iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi null_blk configs [ 36.733438] CPU: 2 PID: 2374 Comm: fio Not tainted 4.15.0-rc2.blk_mq_quiesce+ #714 [ 36.735143] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.9.3-1.fc25 04/01/2014 [ 36.736688] RIP: 0010:kyber_has_work+0x14/0x40 [ 36.737515] RSP: 0018:ffffc9000209bca0 EFLAGS: 00010202 [ 36.738431] RAX: 0000000000000008 RBX: ffff88025578bfc8 RCX: ffff880257bf4ed0 [ 36.739581] RDX: 0000000000000038 RSI: ffffffff81a98c6d RDI: ffff88025578bfc8 [ 36.740730] RBP: ffff880253cebfc8 R08: ffffc9000209bda0 R09: ffff8802554f3480 [ 36.741885] R10: ffffc9000209be60 R11: ffff880263f72538 R12: ffff88025573e9e8 [ 36.743036] R13: ffff88025578bfd0 R14: 0000000000000001 R15: 0000000000000000 [ 36.744189] FS: 00007f9b9bee67c0(0000) GS:ffff88027fc80000(0000) knlGS:0000000000000000 [ 36.746617] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.748483] CR2: 0000000000000008 CR3: 0000000254bf4001 CR4: 00000000003606e0 [ 36.750164] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.751455] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.752796] Call Trace: [ 36.753992] blk_mq_do_dispatch_sched+0x7f/0xe0 [ 36.755110] blk_mq_sched_dispatch_requests+0x119/0x190 [ 36.756179] __blk_mq_run_hw_queue+0x83/0x90 [ 36.757144] __blk_mq_delay_run_hw_queue+0xaf/0x110 [ 36.758046] blk_mq_run_hw_queue+0x24/0x70 [ 36.758845] blk_mq_flush_plug_list+0x1e7/0x270 [ 36.759676] blk_flush_plug_list+0xd6/0x240 [ 36.760463] blk_finish_plug+0x27/0x40 [ 36.761195] do_io_submit+0x19b/0x780 [ 36.761921] ? entry_SYSCALL_64_fastpath+0x1a/0x7d [ 36.762788] entry_SYSCALL_64_fastpath+0x1a/0x7d [ 36.763639] RIP: 0033:0x7f9b9699f697 [ 36.764352] RSP: 002b:00007ffc10f991b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000d1 [ 36.765773] RAX: ffffffffffffffda RBX: 00000000008f6f00 RCX: 00007f9b9699f697 [ 36.766965] RDX: 0000000000a5e6c0 RSI: 0000000000000001 RDI: 00007f9b8462a000 [ 36.768377] RBP: 0000000000000000 R08: 0000000000000001 R09: 00000000008f6420 [ 36.769649] R10: 00007f9b846e5000 R11: 0000000000000206 R12: 00007f9b795d6a70 [ 36.770807] R13: 00007f9b795e4140 R14: 00007f9b795e3fe0 R15: 0000000100000000 [ 36.771955] Code: 83 c7 10 e9 3f 68 d1 ff 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 97 b0 00 00 00 48 8d 42 08 48 83 c2 38 <48> 3b 00 74 06 b8 01 00 00 00 c3 48 3b 40 08 75 f4 48 83 c0 10 [ 36.775004] RIP: kyber_has_work+0x14/0x40 RSP: ffffc9000209bca0 [ 36.776012] CR2: 0000000000000008 [ 36.776690] ---[ end trace 4045cbce364ff2a4 ]--- [ 36.777527] Kernel panic - not syncing: Fatal exception [ 36.778526] Dumping ftrace buffer: [ 36.779313] (ftrace buffer empty) [ 36.780081] Kernel Offset: disabled [ 36.780877] ---[ end Kernel panic - not syncing: Fatal exception Reviewed-by: Christoph Hellwig <hch@lst.de> Tested-by: Yi Zhang <yi.zhang@redhat.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-01-02block: don't let passthrough IO go into .make_request_fn()Ming Lei
commit 14cb0dc6479dc5ebc63b3a459a5d89a2f1b39fed upstream. Commit a8821f3f3("block: Improvements to bounce-buffer handling") tries to make sure that the bio to .make_request_fn won't exceed BIO_MAX_PAGES, but ignores that passthrough I/O can use blk_queue_bounce() too. Especially, passthrough IO may not be sector-aligned, and the check of 'sectors < bio_sectors(*bio_orig)' inside __blk_queue_bounce() may become true even though the max bvec number doesn't exceed BIO_MAX_PAGES, then cause the bio splitted, and the original passthrough bio is submited to generic_make_request(). This patch fixes this issue by checking if the bio is passthrough IO, and use bio_kmalloc() to allocate the cloned passthrough bio. Cc: NeilBrown <neilb@suse.com> Fixes: a8821f3f3("block: Improvements to bounce-buffer handling") Tested-by: Michele Ballabio <barra_cuda@katamail.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-01-02block: fix blk_rq_append_bioJens Axboe
commit 0abc2a10389f0c9070f76ca906c7382788036b93 upstream. Commit caa4b02476e3(blk-map: call blk_queue_bounce from blk_rq_append_bio) moves blk_queue_bounce() into blk_rq_append_bio(), but don't consider the fact that the bounced bio becomes invisible to caller since the parameter type is 'struct bio *'. Make it a pointer to a pointer to a bio, so the caller sees the right bio also after a bounce. Fixes: caa4b02476e3 ("blk-map: call blk_queue_bounce from blk_rq_append_bio") Cc: Christoph Hellwig <hch@lst.de> Reported-by: Michele Ballabio <barra_cuda@katamail.com> (handling failure of blk_rq_append_bio(), only call bio_get() after blk_rq_append_bio() returns OK) Tested-by: Michele Ballabio <barra_cuda@katamail.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-12-29block-throttle: avoid double chargeShaohua Li
commit 111be883981748acc9a56e855c8336404a8e787c upstream. If a bio is throttled and split after throttling, the bio could be resubmited and enters the throttling again. This will cause part of the bio to be charged multiple times. If the cgroup has an IO limit, the double charge will significantly harm the performance. The bio split becomes quite common after arbitrary bio size change. To fix this, we always set the BIO_THROTTLED flag if a bio is throttled. If the bio is cloned/split, we copy the flag to new bio too to avoid a double charge. However, cloned bio could be directed to a new disk, keeping the flag be a problem. The observation is we always set new disk for the bio in this case, so we can clear the flag in bio_set_dev(). This issue exists for a long time, arbitrary bio size change just makes it worse, so this should go into stable at least since v4.2. V1-> V2: Not add extra field in bio based on discussion with Tejun Cc: Vivek Goyal <vgoyal@redhat.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-12-25block,bfq: Disable writeback throttlingLuca Miccio
[ Upstream commit b5dc5d4d1f4ff9032eb6c21a3c571a1317dc9289 ] Similarly to CFQ, BFQ has its write-throttling heuristics, and it is better not to combine them with further write-throttling heuristics of a different nature. So this commit disables write-back throttling for a device if BFQ is used as I/O scheduler for that device. Signed-off-by: Luca Miccio <lucmiccio@gmail.com> Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name> Tested-by: Lee Tibbert <lee.tibbert@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-12-20blk-mq-sched: dispatch from scheduler IFF progress is made in ->dispatchMing Lei
[ Upstream commit 5e3d02bbafad38975099b5848f5ebadedcf7bb7e ] When the hw queue is busy, we shouldn't take requests from the scheduler queue any more, otherwise it is difficult to do IO merge. This patch fixes the awful IO performance on some SCSI devices(lpfc, qla2xxx, ...) when mq-deadline/kyber is used by not taking requests if hw queue is busy. Reviewed-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-12-20badblocks: fix wrong return value in badblocks_set if badblocks are disabledLiu Bo
[ Upstream commit 39b4954c0a1556f8f7f1fdcf59a227117fcd8a0b ] MD's rdev_set_badblocks() expects that badblocks_set() returns 1 if badblocks are disabled, otherwise, rdev_set_badblocks() will record superblock changes and return success in that case and md will fail to report an IO error which it should. This bug has existed since badblocks were introduced in commit 9e0e252a048b ("badblocks: Add core badblock management code"). Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Acked-by: Guoqing Jiang <gqjiang@suse.com> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-12-17blk-mq: Avoid that request queue removal can trigger list corruptionBart Van Assche
[ Upstream commit aba7afc5671c23beade64d10caf86e24a9105dab ] Avoid that removal of a request queue sporadically triggers the following warning: list_del corruption. next->prev should be ffff8807d649b970, but was 6b6b6b6b6b6b6b6b WARNING: CPU: 3 PID: 342 at lib/list_debug.c:56 __list_del_entry_valid+0x92/0xa0 Call Trace: process_one_work+0x11b/0x660 worker_thread+0x3d/0x3b0 kthread+0x129/0x140 ret_from_fork+0x27/0x40 Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-12-14block: wake up all tasks blocked in get_request()Ming Lei
[ Upstream commit 34d9715ac1edd50285168dd8d80c972739a4f6a4 ] Once blk_set_queue_dying() is done in blk_cleanup_queue(), we call blk_freeze_queue() and wait for q->q_usage_counter becoming zero. But if there are tasks blocked in get_request(), q->q_usage_counter can never become zero. So we have to wake up all these tasks in blk_set_queue_dying() first. Fixes: 3ef28e83ab157997 ("block: generic request_queue reference counting") Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-30block: Fix a race between blk_cleanup_queue() and timeout handlingBart Van Assche
commit 4e9b6f20828ac880dbc1fa2fdbafae779473d1af upstream. Make sure that if the timeout timer fires after a queue has been marked "dying" that the affected requests are finished. Reported-by: chenxiang (M) <chenxiang66@hisilicon.com> Fixes: commit 287922eb0b18 ("block: defer timeouts to a workqueue") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Tested-by: chenxiang (M) <chenxiang66@hisilicon.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Keith Busch <keith.busch@intel.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Ming Lei <ming.lei@redhat.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-24bio: ensure __bio_clone_fast copies bi_partnoMichael Lyle
commit 62530ed8b1d07a45dec94d46e521c0c6c2d476e6 upstream. A new field was introduced in 74d46992e0d9, bi_partno, instead of using bdev->bd_contains and encoding the partition information in the bi_bdev field. __bio_clone_fast was changed to copy the disk information, but not the partition information. At minimum, this regressed bcache and caused data corruption. Signed-off-by: Michael Lyle <mlyle@lyle.org> Fixes: 74d46992e0d9 ("block: replace bi_bdev with a gendisk pointer and partitions index") Reported-by: Pavel Goran <via-bcache@pvgoran.name> Reported-by: Campbell Steven <casteven@gmail.com> Reviewed-by: Coly Li <colyli@suse.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02License cleanup: add SPDX GPL-2.0 license identifier to files with no licenseGreg Kroah-Hartman
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-10-10bio_copy_user_iov(): don't ignore ->iov_offsetAl Viro
Since "block: support large requests in blk_rq_map_user_iov" we started to call it with partially drained iter; that works fine on the write side, but reads create a copy of iter for completion time. And that needs to take the possibility of ->iov_iter != 0 into account... Cc: stable@vger.kernel.org #v4.5+ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-02 16:07:37 +0000