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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2019 Christoph Hellwig.
*/
#include "xfs.h"
static inline unsigned int bio_max_vecs(unsigned int count)
{
return bio_max_segs(howmany(count, PAGE_SIZE));
}
int
xfs_rw_bdev(
struct block_device *bdev,
sector_t sector,
unsigned int count,
char *data,
enum req_op op)
{
unsigned int done = 0, added;
int error;
struct bio *bio;
op |= REQ_META | REQ_SYNC;
if (!is_vmalloc_addr(data))
return bdev_rw_virt(bdev, sector, data, count, op);
bio = bio_alloc(bdev, bio_max_vecs(count), op, GFP_KERNEL);
bio->bi_iter.bi_sector = sector;
do {
added = bio_add_vmalloc_chunk(bio, data + done, count - done);
if (!added) {
struct bio *prev = bio;
bio = bio_alloc(prev->bi_bdev,
bio_max_vecs(count - done),
prev->bi_opf, GFP_KERNEL);
bio->bi_iter.bi_sector = bio_end_sector(prev);
bio_chain(prev, bio);
submit_bio(prev);
}
done += added;
} while (done < count);
error = submit_bio_wait(bio);
bio_put(bio);
if (op == REQ_OP_READ)
invalidate_kernel_vmap_range(data, count);
return error;
}
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