Set correct maximum I/O length. We can only handle I/O of up to
max_request_segments * PAGE_SIZE if the I/O is page-aligned; the largest I/O we can guarantee will work is PAGE_SIZE less than that. This unbreaks 'diskinfo -t'.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=216241
@ -508,7 +508,7 @@ blkfront_initialize(struct xb_softc *sc)
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sc->ring_pages = 1;
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sc->max_requests = BLKIF_MAX_RING_REQUESTS(PAGE_SIZE);
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sc->max_request_segments = BLKIF_MAX_SEGMENTS_PER_HEADER_BLOCK;
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sc->max_request_size = sc->max_request_segments * PAGE_SIZE;
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sc->max_request_size = (sc->max_request_segments - 1) * PAGE_SIZE;
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sc->max_request_blocks = BLKIF_SEGS_TO_BLOCKS(sc->max_request_segments);
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/*
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