diff options
| -rw-r--r-- | include/linux/uio.h | 24 | ||||
| -rw-r--r-- | lib/iov_iter.c | 27 |
2 files changed, 20 insertions, 31 deletions
diff --git a/include/linux/uio.h b/include/linux/uio.h index b70d28693400..5896af36199c 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -247,9 +247,9 @@ void iov_iter_pipe(struct iov_iter *i, unsigned int direction, struct pipe_inode void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count); void iov_iter_xarray(struct iov_iter *i, unsigned int direction, struct xarray *xarray, loff_t start, size_t count); -ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages, +ssize_t iov_iter_get_pages2(struct iov_iter *i, struct page **pages, size_t maxsize, unsigned maxpages, size_t *start); -ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, struct page ***pages, +ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i, struct page ***pages, size_t maxsize, size_t *start); int iov_iter_npages(const struct iov_iter *i, int maxpages); void iov_iter_restore(struct iov_iter *i, struct iov_iter_state *state); @@ -351,24 +351,4 @@ static inline void iov_iter_ubuf(struct iov_iter *i, unsigned int direction, }; } -static inline ssize_t iov_iter_get_pages2(struct iov_iter *i, struct page **pages, - size_t maxsize, unsigned maxpages, size_t *start) -{ - ssize_t res = iov_iter_get_pages(i, pages, maxsize, maxpages, start); - - if (res >= 0) - iov_iter_advance(i, res); - return res; -} - -static inline ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i, struct page ***pages, - size_t maxsize, size_t *start) -{ - ssize_t res = iov_iter_get_pages_alloc(i, pages, maxsize, start); - - if (res >= 0) - iov_iter_advance(i, res); - return res; -} - #endif diff --git a/lib/iov_iter.c b/lib/iov_iter.c index f003a20d8683..c48c83602aae 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1328,6 +1328,7 @@ static ssize_t pipe_get_pages(struct iov_iter *i, left -= PAGE_SIZE - off; if (left <= 0) { buf->len += maxsize; + iov_iter_advance(i, maxsize); return maxsize; } buf->len = PAGE_SIZE; @@ -1347,7 +1348,9 @@ static ssize_t pipe_get_pages(struct iov_iter *i, } if (!npages) return -EFAULT; - return maxsize - left; + maxsize -= left; + iov_iter_advance(i, maxsize); + return maxsize; } static ssize_t iter_xarray_populate_pages(struct page **pages, struct xarray *xa, @@ -1397,7 +1400,9 @@ static ssize_t iter_xarray_get_pages(struct iov_iter *i, if (nr == 0) return 0; - return min_t(size_t, nr * PAGE_SIZE - offset, maxsize); + maxsize = min_t(size_t, nr * PAGE_SIZE - offset, maxsize); + iov_iter_advance(i, maxsize); + return maxsize; } /* must be done on non-empty ITER_UBUF or ITER_IOVEC one */ @@ -1469,7 +1474,9 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i, res = get_user_pages_fast(addr, n, gup_flags, *pages); if (unlikely(res <= 0)) return res; - return min_t(size_t, maxsize, res * PAGE_SIZE - *start); + maxsize = min_t(size_t, maxsize, res * PAGE_SIZE - *start); + iov_iter_advance(i, maxsize); + return maxsize; } if (iov_iter_is_bvec(i)) { struct page **p; @@ -1481,8 +1488,10 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i, return -ENOMEM; p = *pages; for (int k = 0; k < n; k++) - get_page(*p++ = page++); - return min_t(size_t, maxsize, n * PAGE_SIZE - *start); + get_page(p[k] = page + k); + maxsize = min_t(size_t, maxsize, n * PAGE_SIZE - *start); + iov_iter_advance(i, maxsize); + return maxsize; } if (iov_iter_is_pipe(i)) return pipe_get_pages(i, pages, maxsize, maxpages, start); @@ -1491,7 +1500,7 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i, return -EFAULT; } -ssize_t iov_iter_get_pages(struct iov_iter *i, +ssize_t iov_iter_get_pages2(struct iov_iter *i, struct page **pages, size_t maxsize, unsigned maxpages, size_t *start) { @@ -1501,9 +1510,9 @@ ssize_t iov_iter_get_pages(struct iov_iter *i, return __iov_iter_get_pages_alloc(i, &pages, maxsize, maxpages, start); } -EXPORT_SYMBOL(iov_iter_get_pages); +EXPORT_SYMBOL(iov_iter_get_pages2); -ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, +ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i, struct page ***pages, size_t maxsize, size_t *start) { @@ -1518,7 +1527,7 @@ ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, } return len; } -EXPORT_SYMBOL(iov_iter_get_pages_alloc); +EXPORT_SYMBOL(iov_iter_get_pages_alloc2); size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i) |