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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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9
include/linux/uio.h
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@@ -51,7 +51,8 @@ struct iov_iter {
};
size_t count;
union {
const struct iovec *iov;
/* use iter_iov() to get the current vec */
const struct iovec *__iov;
const struct kvec *kvec;
const struct bio_vec *bvec;
struct xarray *xarray;
@@ -68,6 +69,8 @@ struct iov_iter {
};
};
#define iter_iov(iter) (iter)->__iov
static inline enum iter_type iov_iter_type(const struct iov_iter *i)
{
return i->iter_type;
@@ -146,9 +149,9 @@ static inline size_t iov_length(const struct iovec *iov, unsigned long nr_segs)
static inline struct iovec iov_iter_iovec(const struct iov_iter *iter)
{
return (struct iovec) {
.iov_base = iter->iov->iov_base + iter->iov_offset,
.iov_base = iter_iov(iter)->iov_base + iter->iov_offset,
.iov_len = min(iter->count,
iter->iov->iov_len - iter->iov_offset),
iter_iov(iter)->iov_len - iter->iov_offset),
};
}