Add iov_iter_is_bvec and iov_iter_bvec and convert callers.
Signed-off-by: Omar Sandoval <osandov@xxxxxxxxxxx>
---
fs/splice.c | 7 ++-----
include/linux/uio.h | 7 +++++++
mm/iov_iter.c | 12 ++++++++++++
mm/page_io.c | 14 +++++---------
4 files changed, 26 insertions(+), 14 deletions(-)
diff --git a/fs/splice.c b/fs/splice.c
index 75c6058..7c7176f 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1006,11 +1006,8 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
}
/* ... iov_iter */
- from.type = ITER_BVEC | WRITE;
- from.bvec = array;
- from.nr_segs = n;
- from.count = sd.total_len - left;
- from.iov_offset = 0;
+ iov_iter_bvec(&from, ITER_BVEC | WRITE, array, n,
+ sd.total_len - left);
/* ... and iocb */
init_sync_kiocb(&kiocb, out);
diff --git a/include/linux/uio.h b/include/linux/uio.h
index 1c5e453..23bb5e4 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -63,6 +63,11 @@ static inline struct iovec iov_iter_iovec(const struct iov_iter *iter)
};
}
+static inline int iov_iter_is_bvec(const struct iov_iter *iter)
+{
+ return (iter->type & ITER_BVEC) != 0;
+}
+
#define iov_for_each(iov, iter, start) \
if (!((start).type & ITER_BVEC)) \
for (iter = (start); \
@@ -90,6 +95,8 @@ void iov_iter_init(struct iov_iter *i, int direction, const struct iovec *iov,
unsigned long nr_segs, size_t count);
void iov_iter_kvec(struct iov_iter *i, int direction, const struct kvec *iov,
unsigned long nr_segs, size_t count);
+void iov_iter_bvec(struct iov_iter *i, int direction, const struct bio_vec *bv,
+ unsigned long nr_segs, size_t count);
ssize_t iov_iter_get_pages(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,
diff --git a/mm/iov_iter.c b/mm/iov_iter.c
index a1599ca..c975bc4 100644
--- a/mm/iov_iter.c
+++ b/mm/iov_iter.c
@@ -513,6 +513,18 @@ void iov_iter_kvec(struct iov_iter *i, int direction,
}
EXPORT_SYMBOL(iov_iter_kvec);
+void iov_iter_bvec(struct iov_iter *i, int direction, const struct bio_vec *bv,
+ unsigned long nr_segs, size_t count)
+{
+ BUG_ON(!(direction & ITER_BVEC));
+ i->type = direction;
+ i->bvec = bv;
+ i->nr_segs = nr_segs;
+ i->iov_offset = 0;
+ i->count = count;
+}
+EXPORT_SYMBOL(iov_iter_bvec);
+
unsigned long iov_iter_alignment(const struct iov_iter *i)
{
unsigned long res = 0;
diff --git a/mm/page_io.c b/mm/page_io.c
index 955db8b..532a39b 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -264,18 +264,14 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
struct kiocb kiocb;
struct file *swap_file = sis->swap_file;
struct address_space *mapping = swap_file->f_mapping;
+ struct iov_iter from;
struct bio_vec bv = {
.bv_page = page,
- .bv_len = PAGE_SIZE,
- .bv_offset = 0
+ .bv_len = PAGE_SIZE,
+ .bv_offset = 0,
};
- struct iov_iter from = {
- .type = ITER_BVEC | WRITE,
- .count = PAGE_SIZE,
- .iov_offset = 0,
- .nr_segs = 1,
- };
- from.bvec = &bv; /* older gcc versions are broken */
+
+ iov_iter_bvec(&from, ITER_BVEC | WRITE, &bv, 1, PAGE_SIZE);
init_sync_kiocb(&kiocb, swap_file);
kiocb.ki_pos = page_file_offset(page);
--
2.2.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>