kernel/block/bio.c, branch linux-5.1.y

block: Allow mapping of vmalloc-ed buffers

2019-07-26T07:13:03Z

commit b4c5875d36178e8df409bdce232f270cac89fafe upstream. To allow the SCSI subsystem scsi_execute_req() function to issue requests using large buffers that are better allocated with vmalloc() rather than kmalloc(), modify bio_map_kern() to allow passing a buffer allocated with vmalloc(). To do so, detect vmalloc-ed buffers using is_vmalloc_addr(). For vmalloc-ed buffers, flush the buffer using flush_kernel_vmap_range(), use vmalloc_to_page() instead of virt_to_page() to obtain the pages of the buffer, and invalidate the buffer addresses with invalidate_kernel_vmap_range() on completion of read BIOs. This last point is executed using the function bio_invalidate_vmalloc_pages() which is defined only if the architecture defines ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE, that is, if the architecture actually needs the invalidation done. Fixes: 515ce6061312 ("scsi: sd_zbc: Fix sd_zbc_report_zones() buffer allocation") Fixes: e76239a3748c ("block: add a report_zones method") Cc: stable@vger.kernel.org Reviewed-by: Martin K. Petersen Signed-off-by: Damien Le Moal Reviewed-by: Christoph Hellwig Reviewed-by: Chaitanya Kulkarni Reviewed-by: Ming Lei Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

block: avoid to break XEN by multi-page bvec

2019-05-31T13:43:43Z

[ Upstream commit db5ebd6edd2627d7e81a031643cf43587f63e66c ] XEN has special page merge requirement, see xen_biovec_phys_mergeable(). We can't merge pages into one bvec simply for XEN. So move XEN's specific check on page merge into __bio_try_merge_page(), then abvoid to break XEN by multi-page bvec. Cc: ris Ostrovsky Cc: xen-devel@lists.xenproject.org Cc: Omar Sandoval Cc: Christoph Hellwig Reviewed-by: Juergen Gross Signed-off-by: Ming Lei Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin

block: do not leak memory in bio_copy_user_iov()

2019-04-10T22:14:40Z

When bio_add_pc_page() fails in bio_copy_user_iov() we should free the page we just allocated otherwise we are leaking it. Cc: linux-block@vger.kernel.org Cc: Linus Torvalds Cc: stable@vger.kernel.org Reviewed-by: Chaitanya Kulkarni Signed-off-by: Jérôme Glisse Signed-off-by: Jens Axboe

block: add BIO_NO_PAGE_REF flag

2019-03-18T16:44:48Z

If bio_iov_iter_get_pages() is called on an iov_iter that is flagged with NO_REF, then we don't need to add a page reference for the pages that we add. Add BIO_NO_PAGE_REF to track this in the bio, so IO completion knows not to drop a reference to these pages. Signed-off-by: Jens Axboe

block: implement bio helper to add iter bvec pages to bio

2019-02-28T15:24:23Z

For an ITER_BVEC, we can just iterate the iov and add the pages to the bio directly. For now, we grab a reference to those pages, and release them normally on IO completion. This isn't really needed for the normal case of O_DIRECT from/to a file, but some of the more esoteric use cases (like splice(2)) will unconditionally put the pipe buffer pages when the buffers are released. Until we can manage that case properly, ITER_BVEC pages are treated like normal pages in terms of reference counting. Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: enable multipage bvecs

2019-02-15T15:40:12Z

This patch pulls the trigger for multi-page bvecs. Reviewed-by: Omar Sandoval Signed-off-by: Ming Lei Signed-off-by: Jens Axboe

block: allow bio_for_each_segment_all() to iterate over multi-page bvec

2019-02-15T15:40:11Z

This patch introduces one extra iterator variable to bio_for_each_segment_all(), then we can allow bio_for_each_segment_all() to iterate over multi-page bvec. Given it is just one mechannical & simple change on all bio_for_each_segment_all() users, this patch does tree-wide change in one single patch, so that we can avoid to use a temporary helper for this conversion. Reviewed-by: Omar Sandoval Reviewed-by: Christoph Hellwig Signed-off-by: Ming Lei Signed-off-by: Jens Axboe

Merge tag 'for-4.21/block-20190102' of git://git.kernel.dk/linux-block

2019-01-03T02:49:58Z

Pull more block updates from Jens Axboe: - Dead code removal for loop/sunvdc (Chengguang) - Mark BIDI support for bsg as deprecated, logging a single dmesg warning if anyone is actually using it (Christoph) - blkcg cleanup, killing a dead function and making the tryget_closest variant easier to read (Dennis) - Floppy fixes, one fixing a regression in swim3 (Finn) - lightnvm use-after-free fix (Gustavo) - gdrom leak fix (Wenwen) - a set of drbd updates (Lars, Luc, Nathan, Roland) * tag 'for-4.21/block-20190102' of git://git.kernel.dk/linux-block: (28 commits) block/swim3: Fix regression on PowerBook G3 block/swim3: Fix -EBUSY error when re-opening device after unmount block/swim3: Remove dead return statement block/amiflop: Don't log error message on invalid ioctl gdrom: fix a memory leak bug lightnvm: pblk: fix use-after-free bug block: sunvdc: remove redundant code block: loop: remove redundant code bsg: deprecate BIDI support in bsg blkcg: remove unused __blkg_release_rcu() blkcg: clean up blkg_tryget_closest() drbd: Change drbd_request_detach_interruptible's return type to int drbd: Avoid Clang warning about pointless switch statment drbd: introduce P_ZEROES (REQ_OP_WRITE_ZEROES on the "wire") drbd: skip spurious timeout (ping-timeo) when failing promote drbd: don't retry connection if peers do not agree on "authentication" settings drbd: fix print_st_err()'s prototype to match the definition drbd: avoid spurious self-outdating with concurrent disconnect / down drbd: do not block when adjusting "disk-options" while IO is frozen drbd: fix comment typos ...

Merge tag 'for-4.21/block-20181221' of git://git.kernel.dk/linux-block

2018-12-28T21:19:59Z

Pull block updates from Jens Axboe: "This is the main pull request for block/storage for 4.21. Larger than usual, it was a busy round with lots of goodies queued up. Most notable is the removal of the old IO stack, which has been a long time coming. No new features for a while, everything coming in this week has all been fixes for things that were previously merged. This contains: - Use atomic counters instead of semaphores for mtip32xx (Arnd) - Cleanup of the mtip32xx request setup (Christoph) - Fix for circular locking dependency in loop (Jan, Tetsuo) - bcache (Coly, Guoju, Shenghui) * Optimizations for writeback caching * Various fixes and improvements - nvme (Chaitanya, Christoph, Sagi, Jay, me, Keith) * host and target support for NVMe over TCP * Error log page support * Support for separate read/write/poll queues * Much improved polling * discard OOM fallback * Tracepoint improvements - lightnvm (Hans, Hua, Igor, Matias, Javier) * Igor added packed metadata to pblk. Now drives without metadata per LBA can be used as well. * Fix from Geert on uninitialized value on chunk metadata reads. * Fixes from Hans and Javier to pblk recovery and write path. * Fix from Hua Su to fix a race condition in the pblk recovery code. * Scan optimization added to pblk recovery from Zhoujie. * Small geometry cleanup from me. - Conversion of the last few drivers that used the legacy path to blk-mq (me) - Removal of legacy IO path in SCSI (me, Christoph) - Removal of legacy IO stack and schedulers (me) - Support for much better polling, now without interrupts at all. blk-mq adds support for multiple queue maps, which enables us to have a map per type. This in turn enables nvme to have separate completion queues for polling, which can then be interrupt-less. Also means we're ready for async polled IO, which is hopefully coming in the next release. - Killing of (now) unused block exports (Christoph) - Unification of the blk-rq-qos and blk-wbt wait handling (Josef) - Support for zoned testing with null_blk (Masato) - sx8 conversion to per-host tag sets (Christoph) - IO priority improvements (Damien) - mq-deadline zoned fix (Damien) - Ref count blkcg series (Dennis) - Lots of blk-mq improvements and speedups (me) - sbitmap scalability improvements (me) - Make core inflight IO accounting per-cpu (Mikulas) - Export timeout setting in sysfs (Weiping) - Cleanup the direct issue path (Jianchao) - Export blk-wbt internals in block debugfs for easier debugging (Ming) - Lots of other fixes and improvements" * tag 'for-4.21/block-20181221' of git://git.kernel.dk/linux-block: (364 commits) kyber: use sbitmap add_wait_queue/list_del wait helpers sbitmap: add helpers for add/del wait queue handling block: save irq state in blkg_lookup_create() dm: don't reuse bio for flushes nvme-pci: trace SQ status on completions nvme-rdma: implement polling queue map nvme-fabrics: allow user to pass in nr_poll_queues nvme-fabrics: allow nvmf_connect_io_queue to poll nvme-core: optionally poll sync commands block: make request_to_qc_t public nvme-tcp: fix spelling mistake "attepmpt" -> "attempt" nvme-tcp: fix endianess annotations nvmet-tcp: fix endianess annotations nvme-pci: refactor nvme_poll_irqdisable to make sparse happy nvme-pci: only set nr_maps to 2 if poll queues are supported nvmet: use a macro for default error location nvmet: fix comparison of a u16 with -1 blk-mq: enable IO poll if .nr_queues of type poll > 0 blk-mq: change blk_mq_queue_busy() to blk_mq_queue_inflight() blk-mq: skip zero-queue maps in blk_mq_map_swqueue ...

blkcg: clean up blkg_tryget_closest()

2018-12-21T15:47:05Z

The implementation of blkg_tryget_closest() wasn't super obvious and became a point of suspicion when debugging [1]. So let's clean it up so it's obviously not the problem. Also add missing RCU read locking to bio_clone_blkg_association(), which got exposed by adding the RCU read lock held check in blkg_tryget_closest(). [1] https://lore.kernel.org/linux-block/a7e97e4b-0dd8-3a54-23b7-a0f27b17fde8@kernel.dk/ Signed-off-by: Dennis Zhou Signed-off-by: Jens Axboe