user/sven/linux.git/include/linux/bio.h, branch v6.2.7

Revert "block: bio_copy_data_iter"

2023-01-04T21:43:27Z

This reverts commit db1c7d77976775483a8ef240b4c705f113e13ea1. We're reinstating the pktcdvd driver, which needs this API. Signed-off-by: Jens Axboe

block: don't clear REQ_ALLOC_CACHE for non-polled requests

2022-12-16T16:18:09Z

Since commit: b99182c501c3 ("bio: add pcpu caching for non-polling bio_put") we support bio caching for IRQ based IO as well, hence there's no need to manually clear REQ_ALLOC_CACHE if we disable polling on a request. Reviewed-by: Keith Busch Signed-off-by: Jens Axboe

block: bio_copy_data_iter

2022-12-06T17:18:27Z

With the pktcdvdv removal, bio_copy_data_iter is unused now. Fold the logic into bio_copy_data and remove the separate lower level function. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20221206144407.722049-1-hch@lst.de Signed-off-by: Jens Axboe

blk-throttle: fix that io throttle can only work for single bio

2022-09-12T06:19:48Z

Test scripts: cd /sys/fs/cgroup/blkio/ echo "8:0 1024" > blkio.throttle.write_bps_device echo $$ > cgroup.procs dd if=/dev/zero of=/dev/sda bs=10k count=1 oflag=direct & dd if=/dev/zero of=/dev/sda bs=10k count=1 oflag=direct & Test result: 10240 bytes (10 kB, 10 KiB) copied, 10.0134 s, 1.0 kB/s 10240 bytes (10 kB, 10 KiB) copied, 10.0135 s, 1.0 kB/s The problem is that the second bio is finished after 10s instead of 20s. Root cause: 1) second bio will be flagged: __blk_throtl_bio while (true) { ... if (sq->nr_queued[rw]) -> some bio is throttled already break }; bio_set_flag(bio, BIO_THROTTLED); -> flag the bio 2) flagged bio will be dispatched without waiting: throtl_dispatch_tg tg_may_dispatch tg_with_in_bps_limit if (bps_limit == U64_MAX || bio_flagged(bio, BIO_THROTTLED)) *wait = 0; -> wait time is zero return true; commit 9f5ede3c01f9 ("block: throttle split bio in case of iops limit") support to count split bios for iops limit, thus it adds flagged bio checking in tg_with_in_bps_limit() so that split bios will only count once for bps limit, however, it introduce a new problem that io throttle won't work if multiple bios are throttled. In order to fix the problem, handle iops/bps limit in different ways: 1) for iops limit, there is no flag to record if the bio is throttled, and iops is always applied. 2) for bps limit, original bio will be flagged with BIO_BPS_THROTTLED, and io throttle will ignore bio with the flag. Noted this patch also remove the code to set flag in __bio_clone(), it's introduced in commit 111be8839817 ("block-throttle: avoid double charge"), and author thinks split bio can be resubmited and throttled again, which is wrong because split bio will continue to dispatch from caller. Fixes: 9f5ede3c01f9 ("block: throttle split bio in case of iops limit") Cc: Signed-off-by: Yu Kuai Acked-by: Tejun Heo Link: https://lore.kernel.org/r/20220829022240.3348319-2-yukuai1@huaweicloud.com Signed-off-by: Jens Axboe

block: Use the new blk_opf_t type

2022-07-14T18:14:30Z

Use the new blk_opf_t type for arguments and variables that represent request flags or a bitwise combination of a request operation and request flags. Rename the function arguments and also a structure member that hold a request operation and flags from 'rw' into 'opf'. This patch does not change any functionality. Cc: Christoph Hellwig Cc: Ming Lei Cc: Hannes Reinecke Cc: Damien Le Moal Cc: Johannes Thumshirn Signed-off-by: Bart Van Assche Link: https://lore.kernel.org/r/20220714180729.1065367-7-bvanassche@acm.org Signed-off-by: Jens Axboe

block: remove bioset_init_from_src

2022-06-08T18:04:14Z

Unused now, and the interface never really made a whole lot of sense to start with. Signed-off-by: Christoph Hellwig Signed-off-by: Mike Snitzer

Merge tag 'for-5.19/block-2022-05-22' of git://git.kernel.dk/linux-block

2022-05-23T20:56:39Z

Pull block updates from Jens Axboe: "Here are the core block changes for 5.19. This contains: - blk-throttle accounting fix (Laibin) - Series removing redundant assignments (Michal) - Expose bio cache via the bio_set, so that DM can use it (Mike) - Finish off the bio allocation interface cleanups by dealing with the weirdest member of the family. bio_kmalloc combines a kmalloc for the bio and bio_vecs with a hidden bio_init call and magic cleanup semantics (Christoph) - Clean up the block layer API so that APIs consumed by file systems are (almost) only struct block_device based, so that file systems don't have to poke into block layer internals like the request_queue (Christoph) - Clean up the blk_execute_rq* API (Christoph) - Clean up various lose end in the blk-cgroup code to make it easier to follow in preparation of reworking the blkcg assignment for bios (Christoph) - Fix use-after-free issues in BFQ when processes with merged queues get moved to different cgroups (Jan) - BFQ fixes (Jan) - Various fixes and cleanups (Bart, Chengming, Fanjun, Julia, Ming, Wolfgang, me)" * tag 'for-5.19/block-2022-05-22' of git://git.kernel.dk/linux-block: (83 commits) blk-mq: fix typo in comment bfq: Remove bfq_requeue_request_body() bfq: Remove superfluous conversion from RQ_BIC() bfq: Allow current waker to defend against a tentative one bfq: Relax waker detection for shared queues blk-cgroup: delete rcu_read_lock_held() WARN_ON_ONCE() blk-throttle: Set BIO_THROTTLED when bio has been throttled blk-cgroup: Remove unnecessary rcu_read_lock/unlock() blk-cgroup: always terminate io.stat lines block, bfq: make bfq_has_work() more accurate block, bfq: protect 'bfqd->queued' by 'bfqd->lock' block: cleanup the VM accounting in submit_bio block: Fix the bio.bi_opf comment block: reorder the REQ_ flags blk-iocost: combine local_stat and desc_stat to stat block: improve the error message from bio_check_eod block: allow passing a NULL bdev to bio_alloc_clone/bio_init_clone block: remove superfluous calls to blkcg_bio_issue_init kthread: unexport kthread_blkcg blk-cgroup: cleanup blkcg_maybe_throttle_current ...

block: Do not call folio_next() on an unreferenced folio

2022-05-05T04:47:29Z

It is unsafe to call folio_next() on a folio unless you hold a reference on it that prevents it from being split or freed. After returning from the iterator, iomap calls folio_end_writeback() which may drop the last reference to the page, or allow the page to be split. If that happens, the iterator will not advance far enough through the bio_vec, leading to assertion failures like the BUG() in folio_end_writeback() that checks we're not trying to end writeback on a page not currently under writeback. Other assertion failures were also seen, but they're all explained by this one bug. Fix the bug by remembering where the next folio starts before returning from the iterator. There are other ways of fixing this bug, but this seems the simplest. Reported-by: Darrick J. Wong Tested-by: Darrick J. Wong Reported-by: Brian Foster Tested-by: Brian Foster Signed-off-by: Matthew Wilcox (Oracle)

block: turn bio_kmalloc into a simple kmalloc wrapper

2022-04-18T01:30:41Z

Remove the magic autofree semantics and require the callers to explicitly call bio_init to initialize the bio. This allows bio_free to catch accidental bio_put calls on bio_init()ed bios as well. Signed-off-by: Christoph Hellwig Acked-by: Coly Li Acked-by: Mike Snitzer Link: https://lore.kernel.org/r/20220406061228.410163-5-hch@lst.de Signed-off-by: Jens Axboe

block: allow use of per-cpu bio alloc cache by block drivers

2022-04-17T22:49:40Z

Refine per-cpu bio alloc cache interfaces so that DM and other block drivers can properly create and use the cache: DM uses bioset_init_from_src() to do its final bioset initialization, so must update bioset_init_from_src() to set BIOSET_PERCPU_CACHE if %src bioset has a cache. Also move bio_clear_polled() to include/linux/bio.h to allow users outside of block core. Signed-off-by: Mike Snitzer Reviewed-by: Christoph Hellwig Link: https://lore.kernel.org/r/20220324203526.62306-3-snitzer@kernel.org Signed-off-by: Jens Axboe