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2019-10-19zram: fix race between backing_dev_show and backing_dev_storeChenwandun
CPU0: CPU1: backing_dev_show backing_dev_store ...... ...... file = zram->backing_dev; down_read(&zram->init_lock); down_read(&zram->init_init_lock) file_path(file, ...); zram->backing_dev = backing_dev; up_read(&zram->init_lock); up_read(&zram->init_lock); gets the value of zram->backing_dev too early in backing_dev_show, which resultin the value being NULL at the beginning, and not NULL later. backtrace: d_path+0xcc/0x174 file_path+0x10/0x18 backing_dev_show+0x40/0xb4 dev_attr_show+0x20/0x54 sysfs_kf_seq_show+0x9c/0x10c kernfs_seq_show+0x28/0x30 seq_read+0x184/0x488 kernfs_fop_read+0x5c/0x1a4 __vfs_read+0x44/0x128 vfs_read+0xa0/0x138 SyS_read+0x54/0xb4 Link: http://lkml.kernel.org/r/1571046839-16814-1-git-send-email-chenwandun@huawei.com Signed-off-by: Chenwandun <chenwandun@huawei.com> Acked-by: Minchan Kim <minchan@kernel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: <stable@vger.kernel.org> [4.14+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-10-15rbd: cancel lock_dwork if the wait is interruptedDongsheng Yang
There is a warning message in my test with below steps: # rbd bench --io-type write --io-size 4K --io-threads 1 --io-pattern rand test & # sleep 5 # pkill -9 rbd # rbd map test & # sleep 5 # pkill rbd The reason is that the rbd_add_acquire_lock() is interruptable, that means, when we kill the waiting on ->acquire_wait, the lock_dwork could be still running. 1. do_rbd_add() 2. lock_dwork rbd_add_acquire_lock() - queue_delayed_work() lock_dwork queued - wait_for_completion_killable_timeout() <-- kill happen rbd_dev_image_unlock() <-- UNLOCKED now, nothing to do. rbd_dev_device_release() rbd_dev_image_release() - ... lock successed here - cancel_delayed_work_sync(&rbd_dev->lock_dwork) Then when we reach the rbd_dev_free(), WARN_ON is triggered because lock_state is not RBD_LOCK_STATE_UNLOCKED. To fix it, this commit make sure the lock_dwork was finished before calling rbd_dev_image_unlock(). On the other hand, this would not happend in do_rbd_remove(), because after rbd mapped, lock_dwork will only be queued for IO request, and request will continue unless lock_dwork finished. when we call rbd_dev_image_unlock() in do_rbd_remove(), all requests are done. That means, lock_state should not be locked again after rbd_dev_image_unlock(). [ Cancel lock_dwork in rbd_add_acquire_lock(), only if the wait is interrupted. ] Fixes: 637cd060537d ("rbd: new exclusive lock wait/wake code") Signed-off-by: Dongsheng Yang <dongsheng.yang@easystack.cn> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2019-10-11Merge tag 'for-linus-20191010' of git://git.kernel.dk/linux-blockLinus Torvalds
Pull block fixes from Jens Axboe: - Fix wbt performance regression introduced with the blk-rq-qos refactoring (Harshad) - Fix io_uring fileset removal inadvertently killing the workqueue (me) - Fix io_uring typo in linked command nonblock submission (Pavel) - Remove spurious io_uring wakeups on request free (Pavel) - Fix null_blk zoned command error return (Keith) - Don't use freezable workqueues for backing_dev, also means we can revert a previous libata hack (Mika) - Fix nbd sysfs mutex dropped too soon at removal time (Xiubo) * tag 'for-linus-20191010' of git://git.kernel.dk/linux-block: nbd: fix possible sysfs duplicate warning null_blk: Fix zoned command return code io_uring: only flush workqueues on fileset removal io_uring: remove wait loop spurious wakeups blk-wbt: fix performance regression in wbt scale_up/scale_down Revert "libata, freezer: avoid block device removal while system is frozen" bdi: Do not use freezable workqueue io_uring: fix reversed nonblock flag for link submission
2019-10-10nbd: fix possible sysfs duplicate warningXiubo Li
1. nbd_put takes the mutex and drops nbd->ref to 0. It then does idr_remove and drops the mutex. 2. nbd_genl_connect takes the mutex. idr_find/idr_for_each fails to find an existing device, so it does nbd_dev_add. 3. just before the nbd_put could call nbd_dev_remove or not finished totally, but if nbd_dev_add try to add_disk, we can hit: debugfs: Directory 'nbd1' with parent 'block' already present! This patch will make sure all the disk add/remove stuff are done by holding the nbd_index_mutex lock. Reported-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-10-09null_blk: Fix zoned command return codeKeith Busch
The return code from null_handle_zoned() sets the cmd->error value. Returning OK status when an error occured overwrites the intended cmd->error. Return the appropriate error code instead of setting the error in the cmd. Fixes: fceb5d1b19cbe626 ("null_blk: create a helper for zoned devices") Cc: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-10-04Merge tag 'for-linus-2019-10-03' of git://git.kernel.dk/linux-blockLinus Torvalds
Pull block fixes from Jens Axboe: - Mandate timespec64 for the io_uring timeout ABI (Arnd) - Set of NVMe changes via Sagi: - controller removal race fix from Balbir - quirk additions from Gabriel and Jian-Hong - nvme-pci power state save fix from Mario - Add 64bit user commands (for 64bit registers) from Marta - nvme-rdma/nvme-tcp fixes from Max, Mark and Me - Minor cleanups and nits from James, Dan and John - Two s390 dasd fixes (Jan, Stefan) - Have loop change block size in DIO mode (Martijn) - paride pg header ifdef guard (Masahiro) - Two blk-mq queue scheduler tweaks, fixing an ordering issue on zoned devices and suboptimal performance on others (Ming) * tag 'for-linus-2019-10-03' of git://git.kernel.dk/linux-block: (22 commits) block: sed-opal: fix sparse warning: convert __be64 data block: sed-opal: fix sparse warning: obsolete array init. block: pg: add header include guard Revert "s390/dasd: Add discard support for ESE volumes" s390/dasd: Fix error handling during online processing io_uring: use __kernel_timespec in timeout ABI loop: change queue block size to match when using DIO blk-mq: apply normal plugging for HDD blk-mq: honor IO scheduler for multiqueue devices nvme-rdma: fix possible use-after-free in connect timeout nvme: Move ctrl sqsize to generic space nvme: Add ctrl attributes for queue_count and sqsize nvme: allow 64-bit results in passthru commands nvme: Add quirk for Kingston NVME SSD running FW E8FK11.T nvmet-tcp: remove superflous check on request sgl Added QUIRKs for ADATA XPG SX8200 Pro 512GB nvme-rdma: Fix max_hw_sectors calculation nvme: fix an error code in nvme_init_subsystem() nvme-pci: Save PCI state before putting drive into deepest state nvme-tcp: fix wrong stop condition in io_work ...
2019-10-01loop: change queue block size to match when using DIOMartijn Coenen
The loop driver assumes that if the passed in fd is opened with O_DIRECT, the caller wants to use direct I/O on the loop device. However, if the underlying block device has a different block size than the loop block queue, direct I/O can't be enabled. Instead of requiring userspace to manually change the blocksize and re-enable direct I/O, just change the queue block sizes to match, as well as the io_min size. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martijn Coenen <maco@android.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-26Merge branch 'akpm' (patches from Andrew)Linus Torvalds
Merge more updates from Andrew Morton: - almost all of the rest of -mm - various other subsystems Subsystems affected by this patch series: memcg, misc, core-kernel, lib, checkpatch, reiserfs, fat, fork, cpumask, kexec, uaccess, kconfig, kgdb, bug, ipc, lzo, kasan, madvise, cleanups, pagemap * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (77 commits) arch/sparc/include/asm/pgtable_64.h: fix build mm: treewide: clarify pgtable_page_{ctor,dtor}() naming ntfs: remove (un)?likely() from IS_ERR() conditions IB/hfi1: remove unlikely() from IS_ERR*() condition xfs: remove unlikely() from WARN_ON() condition wimax/i2400m: remove unlikely() from WARN*() condition fs: remove unlikely() from WARN_ON() condition xen/events: remove unlikely() from WARN() condition checkpatch: check for nested (un)?likely() calls hexagon: drop empty and unused free_initrd_mem mm: factor out common parts between MADV_COLD and MADV_PAGEOUT mm: introduce MADV_PAGEOUT mm: change PAGEREF_RECLAIM_CLEAN with PAGE_REFRECLAIM mm: introduce MADV_COLD mm: untag user pointers in mmap/munmap/mremap/brk vfio/type1: untag user pointers in vaddr_get_pfn tee/shm: untag user pointers in tee_shm_register media/v4l2-core: untag user pointers in videobuf_dma_contig_user_get drm/radeon: untag user pointers in radeon_gem_userptr_ioctl drm/amdgpu: untag user pointers ...
2019-09-25augmented rbtree: add new RB_DECLARE_CALLBACKS_MAX macroMichel Lespinasse
Add RB_DECLARE_CALLBACKS_MAX, which generates augmented rbtree callbacks for the case where the augmented value is a scalar whose definition follows a max(f(node)) pattern. This actually covers all present uses of RB_DECLARE_CALLBACKS, and saves some (source) code duplication in the various RBCOMPUTE function definitions. [walken@google.com: fix mm/vmalloc.c] Link: http://lkml.kernel.org/r/CANN689FXgK13wDYNh1zKxdipeTuALG4eKvKpsdZqKFJ-rvtGiQ@mail.gmail.com [walken@google.com: re-add check to check_augmented()] Link: http://lkml.kernel.org/r/20190727022027.GA86863@google.com Link: http://lkml.kernel.org/r/20190703040156.56953-3-walken@google.com Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Uladzislau Rezki <urezki@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25Merge tag 'ceph-for-5.4-rc1' of git://github.com/ceph/ceph-clientLinus Torvalds
Pull ceph updates from Ilya Dryomov: "The highlights are: - automatic recovery of a blacklisted filesystem session (Zheng Yan). This is disabled by default and can be enabled by mounting with the new "recover_session=clean" option. - serialize buffered reads and O_DIRECT writes (Jeff Layton). Care is taken to avoid serializing O_DIRECT reads and writes with each other, this is based on the exclusion scheme from NFS. - handle large osdmaps better in the face of fragmented memory (myself) - don't limit what security.* xattrs can be get or set (Jeff Layton). We were overly restrictive here, unnecessarily preventing things like file capability sets stored in security.capability from working. - allow copy_file_range() within the same inode and across different filesystems within the same cluster (Luis Henriques)" * tag 'ceph-for-5.4-rc1' of git://github.com/ceph/ceph-client: (41 commits) ceph: call ceph_mdsc_destroy from destroy_fs_client libceph: use ceph_kvmalloc() for osdmap arrays libceph: avoid a __vmalloc() deadlock in ceph_kvmalloc() ceph: allow object copies across different filesystems in the same cluster ceph: include ceph_debug.h in cache.c ceph: move static keyword to the front of declarations rbd: pull rbd_img_request_create() dout out into the callers ceph: reconnect connection if session hang in opening state libceph: drop unused con parameter of calc_target() ceph: use release_pages() directly rbd: fix response length parameter for encoded strings ceph: allow arbitrary security.* xattrs ceph: only set CEPH_I_SEC_INITED if we got a MAC label ceph: turn ceph_security_invalidate_secctx into static inline ceph: add buffered/direct exclusionary locking for reads and writes libceph: handle OSD op ceph_pagelist_append() errors ceph: don't return a value from void function ceph: don't freeze during write page faults ceph: update the mtime when truncating up ceph: fix indentation in __get_snap_name() ...
2019-09-22pktcdvd: remove warning on attempting to register non-passthrough devJens Axboe
Anatoly reports that he gets the below warning when booting -git on a sparc64 box on debian unstable: ... [ 13.352975] aes_sparc64: Using sparc64 aes opcodes optimized AES implementation [ 13.428002] ------------[ cut here ]------------ [ 13.428081] WARNING: CPU: 21 PID: 586 at drivers/block/pktcdvd.c:2597 pkt_setup_dev+0x2e4/0x5a0 [pktcdvd] [ 13.428147] Attempt to register a non-SCSI queue [ 13.428184] Modules linked in: pktcdvd libdes cdrom aes_sparc64 n2_rng md5_sparc64 sha512_sparc64 rng_core sha256_sparc64 flash sha1_sparc64 ip_tables x_tables ipv6 crc_ccitt nf_defrag_ipv6 autofs4 ext4 crc16 mbcache jbd2 raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor xor async_tx raid6_pq raid1 raid0 multipath linear md_mod crc32c_sparc64 [ 13.428452] CPU: 21 PID: 586 Comm: pktsetup Not tainted 5.3.0-10169-g574cc4539762 #1234 [ 13.428507] Call Trace: [ 13.428542] [00000000004635c0] __warn+0xc0/0x100 [ 13.428582] [0000000000463634] warn_slowpath_fmt+0x34/0x60 [ 13.428626] [000000001045b244] pkt_setup_dev+0x2e4/0x5a0 [pktcdvd] [ 13.428674] [000000001045ccf4] pkt_ctl_ioctl+0x94/0x220 [pktcdvd] [ 13.428724] [00000000006b95c8] do_vfs_ioctl+0x628/0x6e0 [ 13.428764] [00000000006b96c8] ksys_ioctl+0x48/0x80 [ 13.428803] [00000000006b9714] sys_ioctl+0x14/0x40 [ 13.428847] [0000000000406294] linux_sparc_syscall+0x34/0x44 [ 13.428890] irq event stamp: 4181 [ 13.428924] hardirqs last enabled at (4189): [<00000000004e0a74>] console_unlock+0x634/0x6c0 [ 13.428984] hardirqs last disabled at (4196): [<00000000004e0540>] console_unlock+0x100/0x6c0 [ 13.429048] softirqs last enabled at (3978): [<0000000000b2e2d8>] __do_softirq+0x498/0x520 [ 13.429110] softirqs last disabled at (3967): [<000000000042cfb4>] do_softirq_own_stack+0x34/0x60 [ 13.429172] ---[ end trace 2220ca468f32967d ]--- [ 13.430018] pktcdvd: setup of pktcdvd device failed [ 13.455589] des_sparc64: Using sparc64 des opcodes optimized DES implementation [ 13.515334] camellia_sparc64: Using sparc64 camellia opcodes optimized CAMELLIA implementation [ 13.522856] pktcdvd: setup of pktcdvd device failed [ 13.529327] pktcdvd: setup of pktcdvd device failed [ 13.532932] pktcdvd: setup of pktcdvd device failed [ 13.536165] pktcdvd: setup of pktcdvd device failed [ 13.539372] pktcdvd: setup of pktcdvd device failed [ 13.542834] pktcdvd: setup of pktcdvd device failed [ 13.546536] pktcdvd: setup of pktcdvd device failed [ 15.431071] XFS (dm-0): Mounting V5 Filesystem ... Apparently debian auto-attaches any cdrom like device to pktcdvd, which can lead to the above warning. There's really no reason to warn for this situation, kill it. Reported-by: Anatoly Pugachev <matorola@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-17nbd: fix possible page fault for nbd diskXiubo Li
When the NBD_CFLAG_DESTROY_ON_DISCONNECT flag is set and at the same time when the socket is closed due to the server daemon is restarted, just before the last DISCONNET is totally done if we start a new connection by using the old nbd_index, there will be crashing randomly, like: <3>[ 110.151949] block nbd1: Receive control failed (result -32) <1>[ 110.152024] BUG: unable to handle page fault for address: 0000058000000840 <1>[ 110.152063] #PF: supervisor read access in kernel mode <1>[ 110.152083] #PF: error_code(0x0000) - not-present page <6>[ 110.152094] PGD 0 P4D 0 <4>[ 110.152106] Oops: 0000 [#1] SMP PTI <4>[ 110.152120] CPU: 0 PID: 6698 Comm: kworker/u5:1 Kdump: loaded Not tainted 5.3.0-rc4+ #2 <4>[ 110.152136] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 <4>[ 110.152166] Workqueue: knbd-recv recv_work [nbd] <4>[ 110.152187] RIP: 0010:__dev_printk+0xd/0x67 <4>[ 110.152206] Code: 10 e8 c5 fd ff ff 48 8b 4c 24 18 65 48 33 0c 25 28 00 [...] <4>[ 110.152244] RSP: 0018:ffffa41581f13d18 EFLAGS: 00010206 <4>[ 110.152256] RAX: ffffa41581f13d30 RBX: ffff96dd7374e900 RCX: 0000000000000000 <4>[ 110.152271] RDX: ffffa41581f13d20 RSI: 00000580000007f0 RDI: ffffffff970ec24f <4>[ 110.152285] RBP: ffffa41581f13d80 R08: ffff96dd7fc17908 R09: 0000000000002e56 <4>[ 110.152299] R10: ffffffff970ec24f R11: 0000000000000003 R12: ffff96dd7374e900 <4>[ 110.152313] R13: 0000000000000000 R14: ffff96dd7374e9d8 R15: ffff96dd6e3b02c8 <4>[ 110.152329] FS: 0000000000000000(0000) GS:ffff96dd7fc00000(0000) knlGS:0000000000000000 <4>[ 110.152362] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 110.152383] CR2: 0000058000000840 CR3: 0000000067cc6002 CR4: 00000000001606f0 <4>[ 110.152401] Call Trace: <4>[ 110.152422] _dev_err+0x6c/0x83 <4>[ 110.152435] nbd_read_stat.cold+0xda/0x578 [nbd] <4>[ 110.152448] ? __switch_to_asm+0x34/0x70 <4>[ 110.152468] ? __switch_to_asm+0x40/0x70 <4>[ 110.152478] ? __switch_to_asm+0x34/0x70 <4>[ 110.152491] ? __switch_to_asm+0x40/0x70 <4>[ 110.152501] ? __switch_to_asm+0x34/0x70 <4>[ 110.152511] ? __switch_to_asm+0x40/0x70 <4>[ 110.152522] ? __switch_to_asm+0x34/0x70 <4>[ 110.152533] recv_work+0x35/0x9e [nbd] <4>[ 110.152547] process_one_work+0x19d/0x340 <4>[ 110.152558] worker_thread+0x50/0x3b0 <4>[ 110.152568] kthread+0xfb/0x130 <4>[ 110.152577] ? process_one_work+0x340/0x340 <4>[ 110.152609] ? kthread_park+0x80/0x80 <4>[ 110.152637] ret_from_fork+0x35/0x40 This is very easy to reproduce by running the nbd-runner. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-17nbd: rename the runtime flags as NBD_RT_ prefixedXiubo Li
Preparing for the destory when disconnecting crash fixing. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-17Merge tag 'for-5.4/block-2019-09-16' of git://git.kernel.dk/linux-blockLinus Torvalds
Pull block updates from Jens Axboe: - Two NVMe pull requests: - ana log parse fix from Anton - nvme quirks support for Apple devices from Ben - fix missing bio completion tracing for multipath stack devices from Hannes and Mikhail - IP TOS settings for nvme rdma and tcp transports from Israel - rq_dma_dir cleanups from Israel - tracing for Get LBA Status command from Minwoo - Some nvme-tcp cleanups from Minwoo, Potnuri and Myself - Some consolidation between the fabrics transports for handling the CAP register - reset race with ns scanning fix for fabrics (move fabrics commands to a dedicated request queue with a different lifetime from the admin request queue)." - controller reset and namespace scan races fixes - nvme discovery log change uevent support - naming improvements from Keith - multiple discovery controllers reject fix from James - some regular cleanups from various people - Series fixing (and re-fixing) null_blk debug printing and nr_devices checks (André) - A few pull requests from Song, with fixes from Andy, Guoqing, Guilherme, Neil, Nigel, and Yufen. - REQ_OP_ZONE_RESET_ALL support (Chaitanya) - Bio merge handling unification (Christoph) - Pick default elevator correctly for devices with special needs (Damien) - Block stats fixes (Hou) - Timeout and support devices nbd fixes (Mike) - Series fixing races around elevator switching and device add/remove (Ming) - sed-opal cleanups (Revanth) - Per device weight support for BFQ (Fam) - Support for blk-iocost, a new model that can properly account cost of IO workloads. (Tejun) - blk-cgroup writeback fixes (Tejun) - paride queue init fixes (zhengbin) - blk_set_runtime_active() cleanup (Stanley) - Block segment mapping optimizations (Bart) - lightnvm fixes (Hans/Minwoo/YueHaibing) - Various little fixes and cleanups * tag 'for-5.4/block-2019-09-16' of git://git.kernel.dk/linux-block: (186 commits) null_blk: format pr_* logs with pr_fmt null_blk: match the type of parameter nr_devices null_blk: do not fail the module load with zero devices block: also check RQF_STATS in blk_mq_need_time_stamp() block: make rq sector size accessible for block stats bfq: Fix bfq linkage error raid5: use bio_end_sector in r5_next_bio raid5: remove STRIPE_OPS_REQ_PENDING md: add feature flag MD_FEATURE_RAID0_LAYOUT md/raid0: avoid RAID0 data corruption due to layout confusion. raid5: don't set STRIPE_HANDLE to stripe which is in batch list raid5: don't increment read_errors on EILSEQ return nvmet: fix a wrong error status returned in error log page nvme: send discovery log page change events to userspace nvme: add uevent variables for controller devices nvme: enable aen regardless of the presence of I/O queues nvme-fabrics: allow discovery subsystems accept a kato nvmet: Use PTR_ERR_OR_ZERO() in nvmet_init_discovery() nvme: Remove redundant assignment of cq vector nvme: Assign subsys instance from first ctrl ...
2019-09-16null_blk: format pr_* logs with pr_fmtAndré Almeida
Instead of writing "null_blk: " at the beginning of each pr_err/info/warn log message, format messages using pr_fmt() macro. Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: André Almeida <andrealmeid@collabora.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-16null_blk: match the type of parameter nr_devicesAndré Almeida
Since the variable nr_devices is an unsigned int, the module_param() should also use this type. Change the type so they can match. Fixes: f7c4ce890dd2 ("null_blk: validate the number of devices") Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: André Almeida <andrealmeid@collabora.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-16null_blk: do not fail the module load with zero devicesAndré Almeida
The module load should fail only if there is something wrong with the configuration or if an error prevents it to work properly. The module should be able to be loaded with (nr_device == 0), since it will not trigger errors or be in malfunction state. Preventing loading with zero devices also breaks applications that configures this module using configfs API. Remove the nr_device check to fix this. Fixes: f7c4ce890dd2 ("null_blk: validate the number of devices") Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: André Almeida <andrealmeid@collabora.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-16rbd: pull rbd_img_request_create() dout out into the callersIlya Dryomov
Make it more informative: log op_type, offset and length for block layer requests and initiating obj_req for child requests. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2019-09-16rbd: fix response length parameter for encoded stringsDongsheng Yang
rbd_dev_image_id() allocates space for length but passes a smaller value to rbd_obj_method_sync(). rbd_dev_v2_object_prefix() doesn't allocate space for length. Fix both to be consistent. Signed-off-by: Dongsheng Yang <dongsheng.yang@easystack.cn> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2019-09-11null_blk: validate the number of devicesAndré Almeida
A negative number of devices is nonsensical, so change the type to unsigned. If the number of devices is 0, it is impossible for userspace to interact with the module, so refuse loading the driver for that case. Signed-off-by: André Almeida <andrealmeid@collabora.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-11null_blk: fix module name at log messageAndré Almeida
The name of the module is "null_blk", not "null". Make `pr_info()` follow the pattern of `pr_err()` log messages. Signed-off-by: André Almeida <andrealmeid@collabora.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-05block: Set ELEVATOR_F_ZBD_SEQ_WRITE for nullblk zoned disksDamien Le Moal
Using the helper blk_queue_required_elevator_features(), set the elevator feature ELEVATOR_F_ZBD_SEQ_WRITE as required for the request queue of null_blk devices created with zoned mode enabled. This feature requirement can always be satisfied as the mq-deadline elevator is always selected for in-kernel compilation when CONFIG_BLK_DEV_ZONED (zoned block device support) is enabled. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-04paride/pcd: need to check if cd->disk is null in pcd_detectzhengbin
If alloc_disk fails in pcd_init_units, cd->disk & pi are empty, we need to check if cd->disk is null in pcd_detect. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: zhengbin <zhengbin13@huawei.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-04paride/pcd: need to set queue to NULL before put_diskzhengbin
In pcd_init_units, if blk_mq_init_sq_queue fails, need to set queue to NULL before put_disk, otherwise null-ptr-deref Read will occur. put_disk kobject_put disk_release blk_put_queue(disk->queue) Fixes: f0d176255401 ("paride/pcd: Fix potential NULL pointer dereference and mem leak") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: zhengbin <zhengbin13@huawei.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-04paride/pf: need to set queue to NULL before put_diskzhengbin
In pf_init_units, if blk_mq_init_sq_queue fails, need to set queue to NULL before put_disk, otherwise null-ptr-deref Read will occur. put_disk kobject_put disk_release blk_put_queue(disk->queue) Fixes: 77218ddf46d8 ("paride: convert pf to blk-mq") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: zhengbin <zhengbin13@huawei.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-28rbd: restore zeroing past the overlap when reading from parentIlya Dryomov
The parent image is read only up to the overlap point, the rest of the buffer should be zeroed. This snuck in because as it turns out the overlap test case has not been triggering this code path for a while now. Fixes: a9b67e69949d ("rbd: replace obj_req->tried_parent with obj_req->read_state") Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2019-08-23null_blk: fix inline misuseJens Axboe
You can't magically mark a function inline and expect that to work. Fixes: fceb5d1b19cb ("null_blk: create a helper for zoned devices") Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: create a helper for req completionChaitanya Kulkarni
This patch creates a helper function for handling the request completion in the null_handle_cmd(). Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: create a helper for zoned devicesChaitanya Kulkarni
This patch creates a helper function for handling zoned block device operations. This patch also restructured the code for null_blk_zoned.c and uses the pattern to return blk_status_t and catch the error in the function null_handle_cmd() into cmd->error variable instead of setting it up in the deeper layer just like the way it is done for flush, badblocks and memory backed case in the null_handle_cmd(). We also move null_handle_zoned() to the null_blk_zoned.c to keep the zoned code separate. Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: create a helper for mem-backed opsChaitanya Kulkarni
This patch creates a helper for handling requests when null_blk is memory backed in the null_handle_cmd(). Although the helper is very simple right now, it makes the code flow consistent with the rest of code in the null_handle_cmd() and provides a uniform code structure for future code. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: create a helper for badblocksChaitanya Kulkarni
This patch creates a helper for handling badblocks code in the null_handle_cmd(). Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: create a helper for throttlingChaitanya Kulkarni
This patch creates a helper for handling throttling code in the null_handle_cmd(). Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: move duplicate code to callersChaitanya Kulkarni
This is a preparation patch which moves the duplicate code for sectors and nr_sectors calculations for bio vs request mode into their respective callers (null_queue_bio(), null_qeueue_req()). Now the core function only deals with the respective actions and commands instead of having to calculte the bio vs req operations and different sector related variables. We also move the flush command handling at the top which significantly simplifies the rest of the code. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-20nbd: fix max number of supported devsMike Christie
This fixes a bug added in 4.10 with commit: commit 9561a7ade0c205bc2ee035a2ac880478dcc1a024 Author: Josef Bacik <jbacik@fb.com> Date: Tue Nov 22 14:04:40 2016 -0500 nbd: add multi-connection support that limited the number of devices to 256. Before the patch we could create 1000s of devices, but the patch switched us from using our own thread to using a work queue which has a default limit of 256 active works. The problem is that our recv_work function sits in a loop until disconnection but only handles IO for one connection. The work is started when the connection is started/restarted, but if we end up creating 257 or more connections, the queue_work call just queues connection257+'s recv_work and that waits for connection 1 - 256's recv_work to be disconnected and that work instance completing. Instead of reverting back to kthreads, this has us allocate a workqueue_struct per device, so we can block in the work. Cc: stable@vger.kernel.org Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-20nbd: fix zero cmd timeout handling v2Mike Christie
This fixes a regression added in 4.9 with commit: commit 0eadf37afc2500e1162c9040ec26a705b9af8d47 Author: Josef Bacik <jbacik@fb.com> Date: Thu Sep 8 12:33:40 2016 -0700 nbd: allow block mq to deal with timeouts where before the patch userspace would set the timeout to 0 to disable it. With the above patch, a zero timeout tells the block layer to use the default value of 30 seconds. For setups where commands can take a long time or experience transient issues like network disruptions this then results in IO errors being sent to the application. To fix this, the patch still uses the common block layer timeout framework, but if zero is set, nbd just logs a message and then resets the timer when it expires. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-20nbd: add missing config putMike Christie
Fix bug added with the patch: commit 8f3ea35929a0806ad1397db99a89ffee0140822a Author: Josef Bacik <josef@toxicpanda.com> Date: Mon Jul 16 12:11:35 2018 -0400 nbd: handle unexpected replies better where if the timeout handler runs when the completion path is and we fail to grab the mutex in the timeout handler we will leave a config reference and cannot free the config later. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-20nbd: add function to convert blk req op to nbd cmdMike Christie
This adds a helper function to convert a block req op to a nbd cmd type. It will be used in the last patch to log the type in the timeout handler. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-20nbd: add set cmd timeout helperMike Christie
Add a helper to set the cmd timeout. It does not really do a lot now, but will be more useful in the next patches. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-19Merge branch 'siginfo-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace Pull kernel thread signal handling fix from Eric Biederman: "I overlooked the fact that kernel threads are created with all signals set to SIG_IGN, and accidentally caused a regression in cifs and drbd when replacing force_sig with send_sig. This is my fix for that regression. I add a new function allow_kernel_signal which allows kernel threads to receive signals sent from the kernel, but continues to ignore all signals sent from userspace. This ensures the user space interface for cifs and drbd remain the same. These kernel threads depend on blocking networking calls which block until something is received or a signal is pending. Making receiving of signals somewhat necessary for these kernel threads. Perhaps someday we can cleanup those interfaces and remove allow_kernel_signal. If not allow_kernel_signal is pretty trivial and clearly documents what is going on so I don't think we will mind carrying it" * 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: signal: Allow cifs and drbd to receive their terminating signals
2019-08-19signal: Allow cifs and drbd to receive their terminating signalsEric W. Biederman
My recent to change to only use force_sig for a synchronous events wound up breaking signal reception cifs and drbd. I had overlooked the fact that by default kthreads start out with all signals set to SIG_IGN. So a change I thought was safe turned out to have made it impossible for those kernel thread to catch their signals. Reverting the work on force_sig is a bad idea because what the code was doing was very much a misuse of force_sig. As the way force_sig ultimately allowed the signal to happen was to change the signal handler to SIG_DFL. Which after the first signal will allow userspace to send signals to these kernel threads. At least for wake_ack_receiver in drbd that does not appear actively wrong. So correct this problem by adding allow_kernel_signal that will allow signals whose siginfo reports they were sent by the kernel through, but will not allow userspace generated signals, and update cifs and drbd to call allow_kernel_signal in an appropriate place so that their thread can receive this signal. Fixing things this way ensures that userspace won't be able to send signals and cause problems, that it is clear which signals the threads are expecting to receive, and it guarantees that nothing else in the system will be affected. This change was partly inspired by similar cifs and drbd patches that added allow_signal. Reported-by: ronnie sahlberg <ronniesahlberg@gmail.com> Reported-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> Tested-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> Cc: Steve French <smfrench@gmail.com> Cc: Philipp Reisner <philipp.reisner@linbit.com> Cc: David Laight <David.Laight@ACULAB.COM> Fixes: 247bc9470b1e ("cifs: fix rmmod regression in cifs.ko caused by force_sig changes") Fixes: 72abe3bcf091 ("signal/cifs: Fix cifs_put_tcp_session to call send_sig instead of force_sig") Fixes: fee109901f39 ("signal/drbd: Use send_sig not force_sig") Fixes: 3cf5d076fb4d ("signal: Remove task parameter from force_sig") Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2019-08-12xen/blkback: fix memory leaksWenwen Wang
In read_per_ring_refs(), after 'req' and related memory regions are allocated, xen_blkif_map() is invoked to map the shared frame, irq, and etc. However, if this mapping process fails, no cleanup is performed, leading to memory leaks. To fix this issue, invoke the cleanup before returning the error. Acked-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-09floppy: fix usercopy directionJann Horn
As sparse points out, these two copy_from_user() should actually be copy_to_user(). Fixes: 229b53c9bf4e ("take floppy compat ioctls to sodding floppy.c") Cc: stable@vger.kernel.org Acked-by: Alexander Popov <alex.popov@linux.com> Reviewed-by: Mukesh Ojha <mojha@codeaurora.org> Signed-off-by: Jann Horn <jannh@google.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-08loop: Add LOOP_SET_DIRECT_IO to compat ioctlAlessio Balsini
Enabling Direct I/O with loop devices helps reducing memory usage by avoiding double caching. 32 bit applications running on 64 bits systems are currently not able to request direct I/O because is missing from the lo_compat_ioctl. This patch fixes the compatibility issue mentioned above by exporting LOOP_SET_DIRECT_IO as additional lo_compat_ioctl() entry. The input argument for this ioctl is a single long converted to a 1-bit boolean, so compatibility is preserved. Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Alessio Balsini <balsini@android.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-08loop: set PF_MEMALLOC_NOIO for the worker threadMikulas Patocka
A deadlock with this stacktrace was observed. The loop thread does a GFP_KERNEL allocation, it calls into dm-bufio shrinker and the shrinker depends on I/O completion in the dm-bufio subsystem. In order to fix the deadlock (and other similar ones), we set the flag PF_MEMALLOC_NOIO at loop thread entry. PID: 474 TASK: ffff8813e11f4600 CPU: 10 COMMAND: "kswapd0" #0 [ffff8813dedfb938] __schedule at ffffffff8173f405 #1 [ffff8813dedfb990] schedule at ffffffff8173fa27 #2 [ffff8813dedfb9b0] schedule_timeout at ffffffff81742fec #3 [ffff8813dedfba60] io_schedule_timeout at ffffffff8173f186 #4 [ffff8813dedfbaa0] bit_wait_io at ffffffff8174034f #5 [ffff8813dedfbac0] __wait_on_bit at ffffffff8173fec8 #6 [ffff8813dedfbb10] out_of_line_wait_on_bit at ffffffff8173ff81 #7 [ffff8813dedfbb90] __make_buffer_clean at ffffffffa038736f [dm_bufio] #8 [ffff8813dedfbbb0] __try_evict_buffer at ffffffffa0387bb8 [dm_bufio] #9 [ffff8813dedfbbd0] dm_bufio_shrink_scan at ffffffffa0387cc3 [dm_bufio] #10 [ffff8813dedfbc40] shrink_slab at ffffffff811a87ce #11 [ffff8813dedfbd30] shrink_zone at ffffffff811ad778 #12 [ffff8813dedfbdc0] kswapd at ffffffff811ae92f #13 [ffff8813dedfbec0] kthread at ffffffff810a8428 #14 [ffff8813dedfbf50] ret_from_fork at ffffffff81745242 PID: 14127 TASK: ffff881455749c00 CPU: 11 COMMAND: "loop1" #0 [ffff88272f5af228] __schedule at ffffffff8173f405 #1 [ffff88272f5af280] schedule at ffffffff8173fa27 #2 [ffff88272f5af2a0] schedule_preempt_disabled at ffffffff8173fd5e #3 [ffff88272f5af2b0] __mutex_lock_slowpath at ffffffff81741fb5 #4 [ffff88272f5af330] mutex_lock at ffffffff81742133 #5 [ffff88272f5af350] dm_bufio_shrink_count at ffffffffa03865f9 [dm_bufio] #6 [ffff88272f5af380] shrink_slab at ffffffff811a86bd #7 [ffff88272f5af470] shrink_zone at ffffffff811ad778 #8 [ffff88272f5af500] do_try_to_free_pages at ffffffff811adb34 #9 [ffff88272f5af590] try_to_free_pages at ffffffff811adef8 #10 [ffff88272f5af610] __alloc_pages_nodemask at ffffffff811a09c3 #11 [ffff88272f5af710] alloc_pages_current at ffffffff811e8b71 #12 [ffff88272f5af760] new_slab at ffffffff811f4523 #13 [ffff88272f5af7b0] __slab_alloc at ffffffff8173a1b5 #14 [ffff88272f5af880] kmem_cache_alloc at ffffffff811f484b #15 [ffff88272f5af8d0] do_blockdev_direct_IO at ffffffff812535b3 #16 [ffff88272f5afb00] __blockdev_direct_IO at ffffffff81255dc3 #17 [ffff88272f5afb30] xfs_vm_direct_IO at ffffffffa01fe3fc [xfs] #18 [ffff88272f5afb90] generic_file_read_iter at ffffffff81198994 #19 [ffff88272f5afc50] __dta_xfs_file_read_iter_2398 at ffffffffa020c970 [xfs] #20 [ffff88272f5afcc0] lo_rw_aio at ffffffffa0377042 [loop] #21 [ffff88272f5afd70] loop_queue_work at ffffffffa0377c3b [loop] #22 [ffff88272f5afe60] kthread_worker_fn at ffffffff810a8a0c #23 [ffff88272f5afec0] kthread at ffffffff810a8428 #24 [ffff88272f5aff50] ret_from_fork at ffffffff81745242 Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-08block: aoe: Fix kernel crash due to atomic sleep when exitingHe Zhe
Since commit 3582dd291788 ("aoe: convert aoeblk to blk-mq"), aoedev_downdev has had the possibility of sleeping and causing the following crash. BUG: scheduling while atomic: rmmod/2242/0x00000003 Modules linked in: aoe Preemption disabled at: [<ffffffffc01d95e5>] flush+0x95/0x4a0 [aoe] CPU: 7 PID: 2242 Comm: rmmod Tainted: G I 5.2.3 #1 Hardware name: Intel Corporation S5520HC/S5520HC, BIOS S5500.86B.01.10.0025.030220091519 03/02/2009 Call Trace: dump_stack+0x4f/0x6a ? flush+0x95/0x4a0 [aoe] __schedule_bug.cold+0x44/0x54 __schedule+0x44f/0x680 schedule+0x44/0xd0 blk_mq_freeze_queue_wait+0x46/0xb0 ? wait_woken+0x80/0x80 blk_mq_freeze_queue+0x1b/0x20 aoedev_downdev+0x111/0x160 [aoe] flush+0xff/0x4a0 [aoe] aoedev_exit+0x23/0x30 [aoe] aoe_exit+0x35/0x948 [aoe] __se_sys_delete_module+0x183/0x210 __x64_sys_delete_module+0x16/0x20 do_syscall_64+0x4d/0x130 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f24e0043b07 Code: 73 01 c3 48 8b 0d 89 73 0b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 59 73 0b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffe18f7f1e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f24e0043b07 RDX: 000000000000000a RSI: 0000000000000800 RDI: 0000555c3ecf87c8 RBP: 00007ffe18f7f1f0 R08: 0000000000000000 R09: 0000000000000000 R10: 00007f24e00b4ac0 R11: 0000000000000206 R12: 00007ffe18f7f238 R13: 00007ffe18f7f410 R14: 00007ffe18f80e73 R15: 0000555c3ecf8760 This patch, handling in the same way of pass two, unlocks the locks and restart pass one after aoedev_downdev is done. Fixes: 3582dd291788 ("aoe: convert aoeblk to blk-mq") Signed-off-by: He Zhe <zhe.he@windriver.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-04null_blk: implement REQ_OP_ZONE_RESET_ALLChaitanya Kulkarni
This patch implements newly introduced zone reset all operation for null_blk driver. Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-07-31nbd: replace kill_bdev() with __invalidate_device() againMunehisa Kamata
Commit abbbdf12497d ("replace kill_bdev() with __invalidate_device()") once did this, but 29eaadc03649 ("nbd: stop using the bdev everywhere") resurrected kill_bdev() and it has been there since then. So buffer_head mappings still get killed on a server disconnection, and we can still hit the BUG_ON on a filesystem on the top of the nbd device. EXT4-fs (nbd0): mounted filesystem with ordered data mode. Opts: (null) block nbd0: Receive control failed (result -32) block nbd0: shutting down sockets print_req_error: I/O error, dev nbd0, sector 66264 flags 3000 EXT4-fs warning (device nbd0): htree_dirblock_to_tree:979: inode #2: lblock 0: comm ls: error -5 reading directory block print_req_error: I/O error, dev nbd0, sector 2264 flags 3000 EXT4-fs error (device nbd0): __ext4_get_inode_loc:4690: inode #2: block 283: comm ls: unable to read itable block EXT4-fs error (device nbd0) in ext4_reserve_inode_write:5894: IO failure ------------[ cut here ]------------ kernel BUG at fs/buffer.c:3057! invalid opcode: 0000 [#1] SMP PTI CPU: 7 PID: 40045 Comm: jbd2/nbd0-8 Not tainted 5.1.0-rc3+ #4 Hardware name: Amazon EC2 m5.12xlarge/, BIOS 1.0 10/16/2017 RIP: 0010:submit_bh_wbc+0x18b/0x190 ... Call Trace: jbd2_write_superblock+0xf1/0x230 [jbd2] ? account_entity_enqueue+0xc5/0xf0 jbd2_journal_update_sb_log_tail+0x94/0xe0 [jbd2] jbd2_journal_commit_transaction+0x12f/0x1d20 [jbd2] ? __switch_to_asm+0x40/0x70 ... ? lock_timer_base+0x67/0x80 kjournald2+0x121/0x360 [jbd2] ? remove_wait_queue+0x60/0x60 kthread+0xf8/0x130 ? commit_timeout+0x10/0x10 [jbd2] ? kthread_bind+0x10/0x10 ret_from_fork+0x35/0x40 With __invalidate_device(), I no longer hit the BUG_ON with sync or unmount on the disconnected device. Fixes: 29eaadc03649 ("nbd: stop using the bdev everywhere") Cc: linux-block@vger.kernel.org Cc: Ratna Manoj Bolla <manoj.br@gmail.com> Cc: nbd@other.debian.org Cc: stable@vger.kernel.org Cc: David Woodhouse <dwmw@amazon.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Munehisa Kamata <kamatam@amazon.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-07-30loop: Fix mount(2) failure due to race with LOOP_SET_FDJan Kara
Commit 33ec3e53e7b1 ("loop: Don't change loop device under exclusive opener") made LOOP_SET_FD ioctl acquire exclusive block device reference while it updates loop device binding. However this can make perfectly valid mount(2) fail with EBUSY due to racing LOOP_SET_FD holding temporarily the exclusive bdev reference in cases like this: for i in {a..z}{a..z}; do dd if=/dev/zero of=$i.image bs=1k count=0 seek=1024 mkfs.ext2 $i.image mkdir mnt$i done echo "Run" for i in {a..z}{a..z}; do mount -o loop -t ext2 $i.image mnt$i & done Fix the problem by not getting full exclusive bdev reference in LOOP_SET_FD but instead just mark the bdev as being claimed while we update the binding information. This just blocks new exclusive openers instead of failing them with EBUSY thus fixing the problem. Fixes: 33ec3e53e7b1 ("loop: Don't change loop device under exclusive opener") Cc: stable@vger.kernel.org Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-07-29ataflop: Mark expected switch fall-throughGustavo A. R. Silva
Mark switch cases where we are expecting to fall through. This patch fixes the following warning (Building: m68k): drivers/block/ataflop.c: In function ‘fd_locked_ioctl’: drivers/block/ataflop.c:1728:3: warning: this statement may fall through [-Wimplicit-fallthrough=] set_capacity(floppy->disk, MAX_DISK_SIZE * 2); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/block/ataflop.c:1729:2: note: here case FDFMTEND: ^~~~ Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-07-26Merge tag 'for-linus-20190726' of git://git.kernel.dk/linux-blockLinus Torvalds
Pull block fixes from Jens Axboe: - Several io_uring fixes/improvements: - Blocking fix for O_DIRECT (me) - Latter page slowness for registered buffers (me) - Fix poll hang under certain conditions (me) - Defer sequence check fix for wrapped rings (Zhengyuan) - Mismatch in async inc/dec accounting (Zhengyuan) - Memory ordering issue that could cause stall (Zhengyuan) - Track sequential defer in bytes, not pages (Zhengyuan) - NVMe pull request from Christoph - Set of hang fixes for wbt (Josef) - Redundant error message kill for libahci (Ding) - Remove unused blk_mq_sched_started_request() and related ops (Marcos) - drbd dynamic alloc shash descriptor to reduce stack use (Arnd) - blkcg ->pd_stat() non-debug print (Tejun) - bcache memory leak fix (Wei) - Comment fix (Akinobu) - BFQ perf regression fix (Paolo) * tag 'for-linus-20190726' of git://git.kernel.dk/linux-block: (24 commits) io_uring: ensure ->list is initialized for poll commands Revert "nvme-pci: don't create a read hctx mapping without read queues" nvme: fix multipath crash when ANA is deactivated nvme: fix memory leak caused by incorrect subsystem free nvme: ignore subnqn for ADATA SX6000LNP drbd: dynamically allocate shash descriptor block: blk-mq: Remove blk_mq_sched_started_request and started_request bcache: fix possible memory leak in bch_cached_dev_run() io_uring: track io length in async_list based on bytes io_uring: don't use iov_iter_advance() for fixed buffers block: properly handle IOCB_NOWAIT for async O_DIRECT IO blk-mq: allow REQ_NOWAIT to return an error inline io_uring: add a memory barrier before atomic_read rq-qos: use a mb for got_token rq-qos: set ourself TASK_UNINTERRUPTIBLE after we schedule rq-qos: don't reset has_sleepers on spurious wakeups rq-qos: fix missed wake-ups in rq_qos_throttle wait: add wq_has_single_sleeper helper block, bfq: check also in-flight I/O in dispatch plugging block: fix sysfs module parameters directory path in comment ...
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