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49add4966d
Pass the block_device that we plan to use this bio for and the operation to bio_init to optimize the assignment. A NULL block_device can be passed, both for the passthrough case on a raw request_queue and to temporarily avoid refactoring some nasty code. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Link: https://lore.kernel.org/r/20220124091107.642561-19-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 Christoph Hellwig.
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*/
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#include "xfs.h"
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static inline unsigned int bio_max_vecs(unsigned int count)
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{
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return bio_max_segs(howmany(count, PAGE_SIZE));
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}
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static void
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xfs_flush_bdev_async_endio(
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struct bio *bio)
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{
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complete(bio->bi_private);
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}
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/*
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* Submit a request for an async cache flush to run. If the request queue does
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* not require flush operations, just skip it altogether. If the caller needs
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* to wait for the flush completion at a later point in time, they must supply a
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* valid completion. This will be signalled when the flush completes. The
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* caller never sees the bio that is issued here.
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*/
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void
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xfs_flush_bdev_async(
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struct bio *bio,
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struct block_device *bdev,
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struct completion *done)
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{
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struct request_queue *q = bdev->bd_disk->queue;
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if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) {
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complete(done);
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return;
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}
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bio_init(bio, bdev, NULL, 0, REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC);
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bio->bi_private = done;
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bio->bi_end_io = xfs_flush_bdev_async_endio;
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submit_bio(bio);
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}
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int
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xfs_rw_bdev(
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struct block_device *bdev,
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sector_t sector,
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unsigned int count,
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char *data,
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unsigned int op)
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{
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unsigned int is_vmalloc = is_vmalloc_addr(data);
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unsigned int left = count;
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int error;
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struct bio *bio;
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if (is_vmalloc && op == REQ_OP_WRITE)
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flush_kernel_vmap_range(data, count);
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bio = bio_alloc(bdev, bio_max_vecs(left), op | REQ_META | REQ_SYNC,
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GFP_KERNEL);
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bio->bi_iter.bi_sector = sector;
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do {
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struct page *page = kmem_to_page(data);
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unsigned int off = offset_in_page(data);
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unsigned int len = min_t(unsigned, left, PAGE_SIZE - off);
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while (bio_add_page(bio, page, len, off) != len) {
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struct bio *prev = bio;
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bio = bio_alloc(prev->bi_bdev, bio_max_vecs(left),
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prev->bi_opf, GFP_KERNEL);
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bio->bi_iter.bi_sector = bio_end_sector(prev);
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bio_chain(prev, bio);
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submit_bio(prev);
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}
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data += len;
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left -= len;
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} while (left > 0);
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error = submit_bio_wait(bio);
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bio_put(bio);
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if (is_vmalloc && op == REQ_OP_READ)
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invalidate_kernel_vmap_range(data, count);
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return error;
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}
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