The rw argument to direct_IO has some ill-defined semantics. Some
filesystems (e.g., ext4, FAT) decide whether they're doing a write with
rw == WRITE, but others (e.g., XFS) check rw & WRITE. Let's set a good
example in the swap file code and say ITER_BVEC belongs in
iov_iter->flags but not in rw. This caters to the least common
denominator and avoids a sweeping change of every direct_IO
implementation for now.
Signed-off-by: Omar Sandoval <osandov@xxxxxxxxxxx>
---
mm/page_io.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/mm/page_io.c b/mm/page_io.c
index 1630ac0..c229f88 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -285,8 +285,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
set_page_writeback(page);
unlock_page(page);
mutex_lock(&inode->i_mutex);
- ret = mapping->a_ops->direct_IO(ITER_BVEC | WRITE,
- &kiocb, &from,
+ ret = mapping->a_ops->direct_IO(WRITE, &kiocb, &from,
kiocb.ki_pos);
mutex_unlock(&inode->i_mutex);
if (ret == PAGE_SIZE) {
--
2.1.3
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