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2021-04-08block: refactor blk_drop_partitionsChristoph Hellwig1-1/+0
Move the busy check and disk-wide sync into the only caller, so that the remainder can be shared with del_gendisk. Also pass the gendisk instead of the bdev as that is all that is needed. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210406062303.811835-5-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-04-06block: refactor the bounce buffering codeChristoph Hellwig1-4/+12
Get rid of all the PFN arithmetics and just use an enum for the two remaining options, and use PageHighMem for the actual bounce decision. Add a fast path to entirely avoid the call for the common case of a queue not using the legacy bouncing code. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Link: https://lore.kernel.org/r/20210331073001.46776-8-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-04-06block: remove BLK_BOUNCE_ISA supportChristoph Hellwig1-5/+0
Remove the BLK_BOUNCE_ISA support now that all users are gone. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Link: https://lore.kernel.org/r/20210331073001.46776-7-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-02-10block: introduce blk_queue_clear_zone_settings()Damien Le Moal1-0/+2
Introduce the internal function blk_queue_clear_zone_settings() to cleanup all limits and resources related to zoned block devices. This new function is called from blk_queue_set_zoned() when a disk zoned model is set to BLK_ZONED_NONE. This particular case can happens when a partition is created on a host-aware scsi disk. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@edc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-02-08block: use bi_max_vecs to find the bvec poolChristoph Hellwig1-3/+3
Instead of encoding of the bvec pool using magic bio flags, just use a helper to find the pool based on the max_vecs value. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-02-08block: reuse BIO_INLINE_VECS for integrity bvecsChristoph Hellwig1-0/+1
bvec_alloc always uses biovec_slabs, and thus always needs to use the same number of inline vecs. Share a single definition for the data and integrity bvecs. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-01-24block: move three bvec helpers declaration into private helperMing Lei1-0/+4
bvec_alloc(), bvec_free() and bvec_nr_vecs() are only used inside block layer core functions, no need to declare them in public header. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Pavel Begunkov <asml.silence@gmail.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-01-24block: use an xarray for disk->part_tblChristoph Hellwig1-1/+0
Now that no fast path lookups in the partition table are left, there is no point in micro-optimizing the data structure for it. Just use a bog standard xarray. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-01-24blk-mq: use ->bi_bdev for I/O accountingChristoph Hellwig1-2/+0
Remove the reverse map from a sector to a partition for I/O accounting by simply using ->bi_bdev. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-01-24block: store a block_device pointer in struct bioChristoph Hellwig1-2/+0
Replace the gendisk pointer in struct bio with a pointer to the newly improved struct block device. From that the gendisk can be trivially accessed with an extra indirection, but it also allows to directly look up all information related to partition remapping. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-16Merge tag 'for-5.11/drivers-2020-12-14' of git://git.kernel.dk/linux-blockLinus Torvalds1-12/+0
Pull block driver updates from Jens Axboe: "Nothing major in here: - NVMe pull request from Christoph: - nvmet passthrough improvements (Chaitanya Kulkarni) - fcloop error injection support (James Smart) - read-only support for zoned namespaces without Zone Append (Javier González) - improve some error message (Minwoo Im) - reject I/O to offline fabrics namespaces (Victor Gladkov) - PCI queue allocation cleanups (Niklas Schnelle) - remove an unused allocation in nvmet (Amit Engel) - a Kconfig spelling fix (Colin Ian King) - nvme_req_qid simplication (Baolin Wang) - MD pull request from Song: - Fix race condition in md_ioctl() (Dae R. Jeong) - Initialize read_slot properly for raid10 (Kevin Vigor) - Code cleanup (Pankaj Gupta) - md-cluster resync/reshape fix (Zhao Heming) - Move null_blk into its own directory (Damien Le Moal) - null_blk zone and discard improvements (Damien Le Moal) - bcache race fix (Dongsheng Yang) - Set of rnbd fixes/improvements (Gioh Kim, Guoqing Jiang, Jack Wang, Lutz Pogrell, Md Haris Iqbal) - lightnvm NULL pointer deref fix (tangzhenhao) - sr in_interrupt() removal (Sebastian Andrzej Siewior) - FC endpoint security support for s390/dasd (Jan Höppner, Sebastian Ott, Vineeth Vijayan). From the s390 arch guys, arch bits included as it made it easier for them to funnel the feature through the block driver tree. - Follow up fixes (Colin Ian King)" * tag 'for-5.11/drivers-2020-12-14' of git://git.kernel.dk/linux-block: (64 commits) block: drop dead assignments in loop_init() sr: Remove in_interrupt() usage in sr_init_command(). sr: Switch the sector size back to 2048 if sr_read_sector() changed it. cdrom: Reset sector_size back it is not 2048. drivers/lightnvm: fix a null-ptr-deref bug in pblk-core.c null_blk: Move driver into its own directory null_blk: Allow controlling max_hw_sectors limit null_blk: discard zones on reset null_blk: cleanup discard handling null_blk: Improve implicit zone close null_blk: improve zone locking block: Align max_hw_sectors to logical blocksize null_blk: Fail zone append to conventional zones null_blk: Fix zone size initialization bcache: fix race between setting bdev state to none and new write request direct to backing block/rnbd: fix a null pointer dereference on dev->blk_symlink_name block/rnbd-clt: Dynamically alloc buffer for pathname & blk_symlink_name block/rnbd: call kobject_put in the failure path Documentation/ABI/rnbd-srv: add document for force_close block/rnbd-srv: close a mapped device from server side. ...
2020-12-07Revert "block: Fix a lockdep complaint triggered by request queue flushing"Ming Lei1-1/+0
This reverts commit b3c6a59975415bde29cfd76ff1ab008edbf614a9. Now we can avoid nvme-loop lockdep warning of 'lockdep possible recursive locking' by nvme-loop's lock class, no need to apply dynamically allocated lock class key, so revert commit b3c6a5997541("block: Fix a lockdep complaint triggered by request queue flushing"). This way fixes horrible SCSI probe delay issue on megaraid_sas, and it is reported the whole probe may take more than half an hour. Tested-by: Kashyap Desai <kashyap.desai@broadcom.com> Reported-by: Qian Cai <cai@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Sumit Saxena <sumit.saxena@broadcom.com> Cc: John Garry <john.garry@huawei.com> Cc: Kashyap Desai <kashyap.desai@broadcom.com> Cc: Bart Van Assche <bvanassche@acm.org> Cc: Hannes Reinecke <hare@suse.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-01block: merge struct block_device and struct hd_structChristoph Hellwig1-1/+1
Instead of having two structures that represent each block device with different life time rules, merge them into a single one. This also greatly simplifies the reference counting rules, as we can use the inode reference count as the main reference count for the new struct block_device, with the device model reference front ending it for device model interaction. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-01block: pass a block_device to blk_alloc_devtChristoph Hellwig1-1/+1
Pass the block_device actually needed instead of the hd_struct. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-01block: switch partition lookup to use struct block_deviceChristoph Hellwig1-2/+2
Use struct block_device to lookup partitions on a disk. This removes all usage of struct hd_struct from the I/O path. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Acked-by: Coly Li <colyli@suse.de> [bcache] Acked-by: Chao Yu <yuchao0@huawei.com> [f2fs] Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-01block: allocate struct hd_struct as part of struct bdev_inodeChristoph Hellwig1-21/+0
Allocate hd_struct together with struct block_device to pre-load the lifetime rule changes in preparation of merging the two structures. Note that part0 was previously embedded into struct gendisk, but is a separate allocation now, and already points to the block_device instead of the hd_struct. The lifetime of struct gendisk is still controlled by the struct device embedded in the part0 hd_struct. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-01block: move the partition_meta_info to struct block_deviceChristoph Hellwig1-1/+0
Move the partition_meta_info to struct block_device in preparation for killing struct hd_struct. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-01block: move disk stat accounting to struct block_deviceChristoph Hellwig1-1/+0
Move the dkstats and stamp field to struct block_device in preparation of killing struct hd_struct. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-01block: remove the nr_sects field in struct hd_structChristoph Hellwig1-53/+0
Now that the hd_struct always has a block device attached to it, there is no need for having two size field that just get out of sync. Additionally the field in hd_struct did not use proper serialization, possibly allowing for torn writes. By only using the block_device field this problem also gets fixed. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Acked-by: Coly Li <colyli@suse.de> [bcache] Acked-by: Chao Yu <yuchao0@huawei.com> [f2fs] Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-01block: simplify bdev/disk lookup in blkdev_getChristoph Hellwig1-1/+1
To simplify block device lookup and a few other upcoming areas, make sure that we always have a struct block_device available for each disk and each partition, and only find existing block devices in bdget. The only downside of this is that each device and partition uses a little more memory. The upside will be that a lot of code can be simplified. With that all we need to look up the block device is to lookup the inode and do a few sanity checks on the gendisk, instead of the separate lookup for the gendisk. For blk-cgroup which wants to access a gendisk without opening it, a new blkdev_{get,put}_no_open low-level interface is added to replace the previous get_gendisk use. Note that the change to look up block device directly instead of the two step lookup using struct gendisk causes a subtile change in behavior: accessing a non-existing partition on an existing block device can now cause a call to request_module. That call is harmless, and in practice no recent system will access these nodes as they aren't created by udev and static /dev/ setups are unusual. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-01block: move blk_rq_bio_prep() to linux/blk-mq.hChaitanya Kulkarni1-12/+0
This is a preparation patch to have minimal block layer request bio append functionality in the context of the NVMeOF Passthru driver which falls in the fast path and doesn't need calls from blk_rq_append_bio(). Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Reviewed-by: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-10-06block: move blk_mq_sched_try_merge to blk-merge.cChristoph Hellwig1-19/+0
Move blk_mq_sched_try_merge to blk-merge.c, which allows to mark a lot of the merge infrastructure static there. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-10-06block: remove the unused blk_integrity_merge_bio exportChristoph Hellwig1-0/+7
Also move the definition from the public blkdev.h to the private block/blk.h header. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-10-06block: remove the unused blk_integrity_merge_rq exportChristoph Hellwig1-0/+8
Also move the definition from the public blkdev.h to the private block/blk.h header. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-09-01block: remove the disk argument to delete_partitionChristoph Hellwig1-1/+1
We can trivially derive the gendisk from the hd_struct. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-09-01block: Add a new helper to attempt to merge a bioBaolin Wang1-6/+15
There are lots of duplicated code when trying to merge a bio from plug list and sw queue, we can introduce a new helper to attempt to merge a bio, which can simplify the blk_bio_list_merge() and blk_attempt_plug_merge(). Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-09-01block: Move blk_mq_bio_list_merge() into blk-merge.cBaolin Wang1-0/+2
Move the blk_mq_bio_list_merge() into blk-merge.c and rename it as a generic name. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-07-17block: improve discard bio alignment in __blkdev_issue_discard()Coly Li1-0/+14
This patch improves discard bio split for address and size alignment in __blkdev_issue_discard(). The aligned discard bio may help underlying device controller to perform better discard and internal garbage collection, and avoid unnecessary internal fragment. Current discard bio split algorithm in __blkdev_issue_discard() may have non-discarded fregment on device even the discard bio LBA and size are both aligned to device's discard granularity size. Here is the example steps on how to reproduce the above problem. - On a VMWare ESXi 6.5 update3 installation, create a 51GB virtual disk with thin mode and give it to a Linux virtual machine. - Inside the Linux virtual machine, if the 50GB virtual disk shows up as /dev/sdb, fill data into the first 50GB by, # dd if=/dev/zero of=/dev/sdb bs=4096 count=13107200 - Discard the 50GB range from offset 0 on /dev/sdb, # blkdiscard /dev/sdb -o 0 -l 53687091200 - Observe the underlying mapping status of the device # sg_get_lba_status /dev/sdb -m 1048 --lba=0 descriptor LBA: 0x0000000000000000 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000000000800 blocks: 16773120 deallocated descriptor LBA: 0x0000000000fff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000001000000 blocks: 8386560 deallocated descriptor LBA: 0x00000000017ff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000001800000 blocks: 8386560 deallocated descriptor LBA: 0x0000000001fff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000002000000 blocks: 8386560 deallocated descriptor LBA: 0x00000000027ff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000002800000 blocks: 8386560 deallocated descriptor LBA: 0x0000000002fff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000003000000 blocks: 8386560 deallocated descriptor LBA: 0x00000000037ff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000003800000 blocks: 8386560 deallocated descriptor LBA: 0x0000000003fff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000004000000 blocks: 8386560 deallocated descriptor LBA: 0x00000000047ff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000004800000 blocks: 8386560 deallocated descriptor LBA: 0x0000000004fff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000005000000 blocks: 8386560 deallocated descriptor LBA: 0x00000000057ff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000005800000 blocks: 8386560 deallocated descriptor LBA: 0x0000000005fff800 blocks: 2048 mapped (or unknown) descriptor LBA: 0x0000000006000000 blocks: 6291456 deallocated descriptor LBA: 0x0000000006600000 blocks: 0 deallocated Although the discard bio starts at LBA 0 and has 50<<30 bytes size which are perfect aligned to the discard granularity, from the above list these are many 1MB (2048 sectors) internal fragments exist unexpectedly. The problem is in __blkdev_issue_discard(), an improper algorithm causes an improper bio size which is not aligned. 25 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 26 sector_t nr_sects, gfp_t gfp_mask, int flags, 27 struct bio **biop) 28 { 29 struct request_queue *q = bdev_get_queue(bdev); [snipped] 56 57 while (nr_sects) { 58 sector_t req_sects = min_t(sector_t, nr_sects, 59 bio_allowed_max_sectors(q)); 60 61 WARN_ON_ONCE((req_sects << 9) > UINT_MAX); 62 63 bio = blk_next_bio(bio, 0, gfp_mask); 64 bio->bi_iter.bi_sector = sector; 65 bio_set_dev(bio, bdev); 66 bio_set_op_attrs(bio, op, 0); 67 68 bio->bi_iter.bi_size = req_sects << 9; 69 sector += req_sects; 70 nr_sects -= req_sects; [snipped] 79 } 80 81 *biop = bio; 82 return 0; 83 } 84 EXPORT_SYMBOL(__blkdev_issue_discard); At line 58-59, to discard a 50GB range, req_sects is set as return value of bio_allowed_max_sectors(q), which is 8388607 sectors. In the above case, the discard granularity is 2048 sectors, although the start LBA and discard length are aligned to discard granularity, req_sects never has chance to be aligned to discard granularity. This is why there are some still-mapped 2048 sectors fragment in every 4 or 8 GB range. If req_sects at line 58 is set to a value aligned to discard_granularity and close to UNIT_MAX, then all consequent split bios inside device driver are (almostly) aligned to discard_granularity of the device queue. The 2048 sectors still-mapped fragment will disappear. This patch introduces bio_aligned_discard_max_sectors() to return the the value which is aligned to q->limits.discard_granularity and closest to UINT_MAX. Then this patch replaces bio_allowed_max_sectors() with this new routine to decide a more proper split bio length. But we still need to handle the situation when discard start LBA is not aligned to q->limits.discard_granularity, otherwise even the length is aligned, current code may still leave 2048 fragment around every 4GB range. Therefore, to calculate req_sects, firstly the start LBA of discard range is checked (including partition offset), if it is not aligned to discard granularity, the first split location should make sure following bio has bi_sector aligned to discard granularity. Then there won't be still-mapped fragment in the middle of the discard range. The above is how this patch improves discard bio alignment in __blkdev_issue_discard(). Now with this patch, after discard with same command line mentiond previously, sg_get_lba_status returns, descriptor LBA: 0x0000000000000000 blocks: 106954752 deallocated descriptor LBA: 0x0000000006600000 blocks: 0 deallocated We an see there is no 2048 sectors segment anymore, everything is clean. Reported-and-tested-by: Acshai Manoj <acshai.manoj@microfocus.com> Signed-off-by: Coly Li <colyli@suse.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Xiao Ni <xni@redhat.com> Cc: Bart Van Assche <bvanassche@acm.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Enzo Matsumiya <ematsumiya@suse.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-07-08blk-mq: centralise related handling into blk_mq_get_driver_tagMing Lei1-5/+0
Move .nr_active update and request assignment into blk_mq_get_driver_tag(), all are good to do during getting driver tag. Meantime blk-flush related code is simplified and flush request needn't to update the request table manually any more. Signed-off-by: Ming Lei <ming.lei@redhat.com> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-07-01Revert "blk-mq: put driver tag when this request is completed"Jens Axboe1-0/+5
This reverts commits the following commits: 37f4a24c2469a10a4c16c641671bd766e276cf9f 723bf178f158abd1ce6069cb049581b3cb003aab 36a3df5a4574d5ddf59804fcd0c4e9654c514d9a The last one is the culprit, but we have to go a bit deeper to get this to revert cleanly. There's been a report that this breaks some MMC setups [1], and also causes an issue with swap [2]. Until this can be figured out, revert the offending commits. [1] https://lore.kernel.org/linux-block/57fb09b1-54ba-f3aa-f82c-d709b0e6b281@samsung.com/ [2] https://lore.kernel.org/linux-block/20200702043721.GA1087@lca.pw/ Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> Reported-by: Qian Cai <cai@lca.pw> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-07-01block: move ->make_request_fn to struct block_device_operationsChristoph Hellwig1-2/+0
The make_request_fn is a little weird in that it sits directly in struct request_queue instead of an operation vector. Replace it with a block_device_operations method called submit_bio (which describes much better what it does). Also remove the request_queue argument to it, as the queue can be derived pretty trivially from the bio. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-07-01block: remove the request_queue argument from blk_queue_splitChristoph Hellwig1-2/+1
The queue can be trivially derived from the bio, so pass one less argument. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-30blk-mq: centralise related handling into blk_mq_get_driver_tagMing Lei1-5/+0
Move .nr_active update and request assignment into blk_mq_get_driver_tag(), all are good to do during getting driver tag. Meantime blk-flush related code is simplified and flush request needn't to update the request table manually any more. Signed-off-by: Ming Lei <ming.lei@redhat.com> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-29blk-cgroup: remove blkcg_bio_issue_checkChristoph Hellwig1-0/+2
blkcg_bio_issue_check is a giant inline function that does three entirely different things. Factor out the blk-cgroup related bio initalization into a new helper, and the open code the sequence in the only caller, relying on the fact that all the actual functionality is stubbed out for non-cgroup builds. Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-24block: create the request_queue debugfs_dir on registrationLuis Chamberlain1-2/+0
We were only creating the request_queue debugfs_dir only for make_request block drivers (multiqueue), but never for request-based block drivers. We did this as we were only creating non-blktrace additional debugfs files on that directory for make_request drivers. However, since blktrace *always* creates that directory anyway, we special-case the use of that directory on blktrace. Other than this being an eye-sore, this exposes request-based block drivers to the same debugfs fragile race that used to exist with make_request block drivers where if we start adding files onto that directory we can later run a race with a double removal of dentries on the directory if we don't deal with this carefully on blktrace. Instead, just simplify things by always creating the request_queue debugfs_dir on request_queue registration. Rename the mutex also to reflect the fact that this is used outside of the blktrace context. Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-24blk-mq: move failure injection out of blk_mq_complete_requestChristoph Hellwig1-9/+0
Move the call to blk_should_fake_timeout out of blk_mq_complete_request and into the drivers, skipping call sites that are obvious error handlers, and remove the now superflous blk_mq_force_complete_rq helper. This ensures we don't keep injecting errors into completions that just terminate the Linux request after the hardware has been reset or the command has been aborted. Reviewed-by: Daniel Wagner <dwagner@suse.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-04block: nr_sects_write(): Disable preemption on seqcount writeAhmed S. Darwish1-0/+2
For optimized block readers not holding a mutex, the "number of sectors" 64-bit value is protected from tearing on 32-bit architectures by a sequence counter. Disable preemption before entering that sequence counter's write side critical section. Otherwise, the read side can preempt the write side section and spin for the entire scheduler tick. If the reader belongs to a real-time scheduling class, it can spin forever and the kernel will livelock. Fixes: c83f6bf98dc1 ("block: add partition resize function to blkpg ioctl") Cc: <stable@vger.kernel.org> Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-29blk-throttle: remove blk_throtl_drainGuoqing Jiang1-2/+0
After the commit 5addeae1bedc4 ("blk-cgroup: remove blkcg_drain_queue"), there is no caller of blk_throtl_drain, so let's remove it. Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-27block: add a blk_account_io_merge_bio helperKonstantin Khlebnikov1-1/+1
Move the non-"new_io" branch of blk_account_io_start() into separate function. Fix merge accounting for discards (they were counted as write merges). The new blk_account_io_merge_bio() doesn't call update_io_ticks() unlike blk_account_io_start(), as there is no reason for that. [hch: rebased] Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-27block: always use a percpu variable for disk statsChristoph Hellwig1-1/+1
percpu variables have a perfectly fine working stub implementation for UP kernels, so use that. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-27block: move update_io_ticks to blk-core.cChristoph Hellwig1-1/+0
All callers are in blk-core.c, so move update_io_ticks over. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-19block: Remove unused flush_queue_delayed in struct blk_flush_queueBaolin Wang1-1/+0
The flush_queue_delayed was introdued to hold queue if flush is running for non-queueable flush drive by commit 3ac0cc450870 ("hold queue if flush is running for non-queueable flush drive"), but the non mq parts of the flush code had been removed by commit 7e992f847a08 ("block: remove non mq parts from the flush code"), as well as removing the usage of the flush_queue_delayed flag. Thus remove the unused flush_queue_delayed flag. Signed-off-by: Baolin Wang <baolin.wang7@gmail.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-19block: merge part_{inc,dev}_in_flight into their only callersChristoph Hellwig1-4/+0
part_inc_in_flight and part_dec_in_flight only have one caller each, and those callers are purely for bio based drivers. Merge each function into the only caller, and remove the superflous blk-mq checks. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-19block: mark blk_account_io_completion staticChristoph Hellwig1-1/+0
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-19blk-mq: allow blk_mq_make_request to consume the q_usage_counter referenceChristoph Hellwig1-11/+0
blk_mq_make_request currently needs to grab an q_usage_counter reference when allocating a request. This is because the block layer grabs one before calling blk_mq_make_request, but also releases it as soon as blk_mq_make_request returns. Remove the blk_queue_exit call after blk_mq_make_request returns, and instead let it consume the reference. This works perfectly fine for the block layer caller, just device mapper needs an extra reference as the old problem still persists there. Open code blk_queue_enter_live in device mapper, as there should be no other callers and this allows better documenting why we do a non-try get. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-14block: Inline encryption support for blk-mqSatya Tangirala1-0/+2
We must have some way of letting a storage device driver know what encryption context it should use for en/decrypting a request. However, it's the upper layers (like the filesystem/fscrypt) that know about and manages encryption contexts. As such, when the upper layer submits a bio to the block layer, and this bio eventually reaches a device driver with support for inline encryption, the device driver will need to have been told the encryption context for that bio. We want to communicate the encryption context from the upper layer to the storage device along with the bio, when the bio is submitted to the block layer. To do this, we add a struct bio_crypt_ctx to struct bio, which can represent an encryption context (note that we can't use the bi_private field in struct bio to do this because that field does not function to pass information across layers in the storage stack). We also introduce various functions to manipulate the bio_crypt_ctx and make the bio/request merging logic aware of the bio_crypt_ctx. We also make changes to blk-mq to make it handle bios with encryption contexts. blk-mq can merge many bios into the same request. These bios need to have contiguous data unit numbers (the necessary changes to blk-merge are also made to ensure this) - as such, it suffices to keep the data unit number of just the first bio, since that's all a storage driver needs to infer the data unit number to use for each data block in each bio in a request. blk-mq keeps track of the encryption context to be used for all the bios in a request with the request's rq_crypt_ctx. When the first bio is added to an empty request, blk-mq will program the encryption context of that bio into the request_queue's keyslot manager, and store the returned keyslot in the request's rq_crypt_ctx. All the functions to operate on encryption contexts are in blk-crypto.c. Upper layers only need to call bio_crypt_set_ctx with the encryption key, algorithm and data_unit_num; they don't have to worry about getting a keyslot for each encryption context, as blk-mq/blk-crypto handles that. Blk-crypto also makes it possible for request-based layered devices like dm-rq to make use of inline encryption hardware by cloning the rq_crypt_ctx and programming a keyslot in the new request_queue when necessary. Note that any user of the block layer can submit bios with an encryption context, such as filesystems, device-mapper targets, etc. Signed-off-by: Satya Tangirala <satyat@google.com> Reviewed-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-12block: rename __bio_add_pc_page to bio_add_hw_pageChristoph Hellwig1-2/+2
Rename __bio_add_pc_page() to bio_add_hw_page() and explicitly pass in a max_sectors argument. This max_sectors argument can be used to specify constraints from the hardware. Signed-off-by: Christoph Hellwig <hch@lst.de> [ jth: rebased and made public for blk-map.c ] Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Daniel Wagner <dwagner@suse.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-12block: don't hold part0's refcount in IO pathMing Lei1-7/+6
gendisk can't be gone when there is IO activity, so not hold part0's refcount in IO path. Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@infradead.org> Cc: Yufen Yu <yuyufen@huawei.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Hou Tao <houtao1@huawei.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-04-25block: remove create_io_contextChristoph Hellwig1-20/+0
create_io_context just has a single caller, which also happens to not even use the return value. Just open code it there. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-04-20block: remove hd_struct_killChristoph Hellwig1-5/+0
The function has a single caller, so just open code it. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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