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authorDavid Howells <dhowells@redhat.com>2023-01-19 15:47:23 +0300
committerSteve French <stfrench@microsoft.com>2023-02-21 02:25:43 +0300
commitf62e52d1276b6cd329fe72d36bdf912b2ce4caaf (patch)
tree9148a5b0747f037f10052832ed3143a1d6eb784f /lib
parent33b3b041543e8b3abf9a692d0f8c2ab0e07c50cd (diff)
downloadlinux-f62e52d1276b6cd329fe72d36bdf912b2ce4caaf.tar.xz
iov_iter: Define flags to qualify page extraction.
Define flags to qualify page extraction to pass into iov_iter_*_pages*() rather than passing in FOLL_* flags. For now only a flag to allow peer-to-peer DMA is supported. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: John Hubbard <jhubbard@nvidia.com> Reviewed-by: Jens Axboe <axboe@kernel.dk> cc: Al Viro <viro@zeniv.linux.org.uk> cc: Logan Gunthorpe <logang@deltatee.com> cc: linux-fsdevel@vger.kernel.org cc: linux-block@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/iov_iter.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 47c484551c59..9d4949ea9b27 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1426,9 +1426,9 @@ static struct page *first_bvec_segment(const struct iov_iter *i,
static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
struct page ***pages, size_t maxsize,
unsigned int maxpages, size_t *start,
- unsigned int gup_flags)
+ iov_iter_extraction_t extraction_flags)
{
- unsigned int n;
+ unsigned int n, gup_flags = 0;
if (maxsize > i->count)
maxsize = i->count;
@@ -1436,6 +1436,8 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
return 0;
if (maxsize > MAX_RW_COUNT)
maxsize = MAX_RW_COUNT;
+ if (extraction_flags & ITER_ALLOW_P2PDMA)
+ gup_flags |= FOLL_PCI_P2PDMA;
if (likely(user_backed_iter(i))) {
unsigned long addr;
@@ -1489,14 +1491,14 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
ssize_t iov_iter_get_pages(struct iov_iter *i,
struct page **pages, size_t maxsize, unsigned maxpages,
- size_t *start, unsigned gup_flags)
+ size_t *start, iov_iter_extraction_t extraction_flags)
{
if (!maxpages)
return 0;
BUG_ON(!pages);
return __iov_iter_get_pages_alloc(i, &pages, maxsize, maxpages,
- start, gup_flags);
+ start, extraction_flags);
}
EXPORT_SYMBOL_GPL(iov_iter_get_pages);
@@ -1509,14 +1511,14 @@ EXPORT_SYMBOL(iov_iter_get_pages2);
ssize_t iov_iter_get_pages_alloc(struct iov_iter *i,
struct page ***pages, size_t maxsize,
- size_t *start, unsigned gup_flags)
+ size_t *start, iov_iter_extraction_t extraction_flags)
{
ssize_t len;
*pages = NULL;
len = __iov_iter_get_pages_alloc(i, pages, maxsize, ~0U, start,
- gup_flags);
+ extraction_flags);
if (len <= 0) {
kvfree(*pages);
*pages = NULL;