kernel/linux.git/block/bio.c, branch v6.19.11

block: prohibit calls to bio_chain_endio

2025-12-09T17:20:03+00:00

Now that all potential callers of bio_chain_endio have been eliminated, completely prohibit any future calls to this function. Suggested-by: Ming Lei Suggested-by: Andreas Gruenbacher Suggested-by: Christoph Hellwig Reviewed-by: Christoph Hellwig Signed-off-by: Shida Zhang Signed-off-by: Jens Axboe

block: enable per-cpu bio cache by default

2025-12-04T14:19:24+00:00

Since after commit 12e4e8c7ab59 ("io_uring/rw: enable bio caches for IRQ rw"), bio_put is safe for task and irq context, bio_alloc_bioset is safe for task context and no one calls in irq context, so we can enable per cpu bio cache by default. Benchmarked with t/io_uring and ext4+nvme: taskset -c 6 /root/fio/t/io_uring -p0 -d128 -b4096 -s1 -c1 -F1 -B1 -R1 -X1 -n1 -P1 /mnt/testfile base IOPS is 562K, patch IOPS is 574K. The CPU usage of bio_alloc_bioset decrease from 1.42% to 1.22%. The worst case is allocate bio in CPU A but free in CPU B, still use t/io_uring and ext4+nvme: base IOPS is 648K, patch IOPS is 647K. Also use fio test ext4/xfs with libaio/sync/io_uring on null_blk and nvme, no obvious performance regression. Signed-off-by: Fengnan Chang Signed-off-by: Jens Axboe

block: accumulate memory segment gaps per bio

2025-11-07T01:11:58+00:00

The blk-mq dma iterator has an optimization for requests that align to the device's iommu merge boundary. This boundary may be larger than the device's virtual boundary, but the code had been depending on that queue limit to know ahead of time if the request is guaranteed to align to that optimization. Rather than rely on that queue limit, which many devices may not report, save the lowest set bit of any boundary gap between each segment in the bio while checking the segments. The request stores the value for merging and quickly checking per io if the request can use iova optimizations. Signed-off-by: Keith Busch Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Signed-off-by: Jens Axboe

block: rename bio_iov_iter_get_pages_aligned to bio_iov_iter_get_pages

2025-10-07T14:05:44+00:00

Now that the bio_iov_iter_get_pages is free again, use it instead of the more complicated now. Also drop the unused export. Signed-off-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Reviewed-by: Johannes Thumshirn Reviewed-by: Keith Busch Reviewed-by: Qu Wenruo Signed-off-by: Jens Axboe

block: cleanup bio_issue

2025-09-10T11:23:45+00:00

Now that bio->bi_issue is only used by blk-iolatency to get bio issue time, replace bio_issue with u64 time directly and remove bio_issue to make code cleaner. Signed-off-by: Yu Kuai Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: align the bio after building it

2025-09-09T16:27:01+00:00

Instead of ensuring each vector is block size aligned while constructing the bio, just ensure the entire size is aligned after it's built. This makes getting bio pages more flexible to accepting device valid io vectors that would otherwise get rejected by alignment checks. Signed-off-by: Keith Busch Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Signed-off-by: Jens Axboe

block: add size alignment to bio_iov_iter_get_pages

2025-09-09T16:27:01+00:00

The block layer tries to align bio vectors to the block device's logical block size. Some cases don't have a block device, or we may need to align to something larger, which we can't derive it from the queue limits. Have the caller specify what they want, or allow any length alignment if nothing was specified. Since the most common use case relies on the block device's limits, a helper function is provided. Signed-off-by: Keith Busch Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Signed-off-by: Jens Axboe

block: remove the bi_inline_vecs variable sized array from struct bio

2025-09-09T13:31:59+00:00

Bios are embedded into other structures, and at least spare is unhappy about embedding structures with variable sized arrays. There's no real need to the array anyway, we can replace it with a helper pointing to the memory just behind the bio, and with the previous cleanups there is very few site doing anything special with it. Signed-off-by: Christoph Hellwig Reviewed-by: John Garry Signed-off-by: Jens Axboe

block: add a bio_init_inline helper

2025-09-09T13:31:59+00:00

Just a simpler wrapper around bio_init for callers that want to initialize a bio with inline bvecs. Signed-off-by: Christoph Hellwig Reviewed-by: John Garry Reviewed-by: Yu Kuai Signed-off-by: Jens Axboe

blk-mq: remove REQ_P2PDMA flag

2025-08-25T13:44:39+00:00

It's not serving any particular purpose. pci_p2pdma_state() already has all the appropriate checks, so the config and flag checks are not guarding anything. Signed-off-by: Keith Busch Reviewed-by: Kanchan Joshi Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Link: https://lore.kernel.org/r/20250813153153.3260897-5-kbusch@meta.com Signed-off-by: Jens Axboe