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Subject[RFC PATCH 03/22] fuse: convert fuse to use iov_iter_copy_[to|from]_user
Date
A future patch hides the internals of struct iov_iter, so fuse should
be using the supported interface.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: fuse-devel@lists.sourceforge.net
---
fs/fuse/file.c | 29 ++++++++---------------------
1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 4a199fd..877cee0 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1582,30 +1582,17 @@ static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov,
while (iov_iter_count(&ii)) {
struct page *page = pages[page_idx++];
size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii));
- void *kaddr;
+ size_t left;

- kaddr = kmap(page);
-
- while (todo) {
- char __user *uaddr = ii.iov->iov_base + ii.iov_offset;
- size_t iov_len = ii.iov->iov_len - ii.iov_offset;
- size_t copy = min(todo, iov_len);
- size_t left;
-
- if (!to_user)
- left = copy_from_user(kaddr, uaddr, copy);
- else
- left = copy_to_user(uaddr, kaddr, copy);
-
- if (unlikely(left))
- return -EFAULT;
+ if (!to_user)
+ left = iov_iter_copy_from_user(page, &ii, 0, todo);
+ else
+ left = iov_iter_copy_to_user(page, &ii, 0, todo);

- iov_iter_advance(&ii, copy);
- todo -= copy;
- kaddr += copy;
- }
+ if (unlikely(left))
+ return -EFAULT;

- kunmap(page);
+ iov_iter_advance(&ii, todo);
}

return 0;
--
1.7.9.2


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