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iov_iter: add iter_iovec() helper

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This returns a pointer to the current iovec entry in the iterator. Only
useful with ITER_IOVEC right now, but it prepares us to treat ITER_UBUF
and ITER_IOVEC identically for the first segment.

Rename struct iov_iter->iov to iov_iter->__iov to find any potentially
troublesome spots, and also to prevent anyone from adding new code that
accesses iter->iov directly.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2023-03-29 08:52:15 -06:00
parent 0a2481cde2
commit de4f5fed3f
12 changed files with 73 additions and 53 deletions
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4
block/blk-map.c
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@@ -31,8 +31,8 @@ static struct bio_map_data *bio_alloc_map_data(struct iov_iter *data,
return NULL;
bmd->iter = *data;
if (iter_is_iovec(data)) {
memcpy(bmd->iov, data->iov, sizeof(struct iovec) * data->nr_segs);
bmd->iter.iov = bmd->iov;
memcpy(bmd->iov, iter_iov(data), sizeof(struct iovec) * data->nr_segs);
bmd->iter.__iov = bmd->iov;
}
return bmd;
}