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block: add a bdev_rw_virt helper

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Add a helper to perform synchronous I/O on a kernel direct map range.
Currently this is implemented in various places in usually not very
efficient ways, so provide a generic helper instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20250507120451.4000627-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2025-05-07 14:04:26 +02:00
committed by Jens Axboe
parent 850e210d5a
commit 10b1e59cda
2 changed files with 34 additions and 1 deletions
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block/bio.c
+30
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@@ -1319,6 +1319,36 @@ int submit_bio_wait(struct bio *bio)
}
EXPORT_SYMBOL(submit_bio_wait);
/**
* bdev_rw_virt - synchronously read into / write from kernel mapping
* @bdev: block device to access
* @sector: sector to access
* @data: data to read/write
* @len: length in byte to read/write
* @op: operation (e.g. REQ_OP_READ/REQ_OP_WRITE)
*
* Performs synchronous I/O to @bdev for @data/@len. @data must be in
* the kernel direct mapping and not a vmalloc address.
*/
int bdev_rw_virt(struct block_device *bdev, sector_t sector, void *data,
size_t len, enum req_op op)
{
struct bio_vec bv;
struct bio bio;
int error;
if (WARN_ON_ONCE(is_vmalloc_addr(data)))
return -EIO;
bio_init(&bio, bdev, &bv, 1, op);
bio.bi_iter.bi_sector = sector;
bio_add_virt_nofail(&bio, data, len);
error = submit_bio_wait(&bio);
bio_uninit(&bio);
return error;
}
EXPORT_SYMBOL_GPL(bdev_rw_virt);
static void bio_wait_end_io(struct bio *bio)
{
complete(bio->bi_private);