iov_iter: Move iov_iter to uio.h

Signed-off-by: Kent Overstreet <kmo@daterainc.com>

2 files changed, 50 insertions, 32 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index ddfff2ecef0b..2261ac8f0534 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -295,38 +295,6 @@ struct page;
 struct address_space;
 struct writeback_control;
 
-struct iov_iter {
-        const struct iovec *iov;
-        unsigned long nr_segs;
-        size_t iov_offset;
-        size_t count;
-};
-
-size_t iov_iter_copy_from_user_atomic(struct page *page,
-                struct iov_iter *i, unsigned long offset, size_t bytes);
-size_t iov_iter_copy_from_user(struct page *page,
-                struct iov_iter *i, unsigned long offset, size_t bytes);
-void iov_iter_advance(struct iov_iter *i, size_t bytes);
-int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
-size_t iov_iter_single_seg_count(const struct iov_iter *i);
-
-static inline void iov_iter_init(struct iov_iter *i,
-                        const struct iovec *iov, unsigned long nr_segs,
-                        size_t count, size_t written)
-{
-        i->iov = iov;
-        i->nr_segs = nr_segs;
-        i->iov_offset = 0;
-        i->count = count + written;
-
-        iov_iter_advance(i, written);
-}
-
-static inline size_t iov_iter_count(struct iov_iter *i)
-{
-        return i->count;
-}
-
 /*
  * "descriptor" for what we're up to with a read.
  * This allows us to use the same read code yet
diff --git a/include/linux/uio.h b/include/linux/uio.h
index c55ce243cc09..347d70ce098e 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -9,14 +9,23 @@
 #ifndef __LINUX_UIO_H
 #define __LINUX_UIO_H
 
+#include <linux/kernel.h>
 #include <uapi/linux/uio.h>
 
+struct page;
 
 struct kvec {
         void *iov_base; /* and that should *never* hold a userland pointer */
         size_t iov_len;
 };
 
+struct iov_iter {
+        const struct iovec *iov;
+        unsigned long nr_segs;
+        size_t iov_offset;
+        size_t count;
+};
+
 /*
  * Total number of bytes covered by an iovec.
  *
@@ -34,8 +43,49 @@ static inline size_t iov_length(const struct iovec *iov, unsigned long nr_segs)
         return ret;
 }
 
+static inline struct iovec iov_iter_iovec(const struct iov_iter *iter)
+{
+        return (struct iovec) {
+                .iov_base = iter->iov->iov_base + iter->iov_offset,
+                .iov_len = min(iter->count,
+                               iter->iov->iov_len - iter->iov_offset),
+        };
+}
+
+#define iov_for_each(iov, iter, start)                          \
+        for (iter = (start);                                    \
+             (iter).count &&                                    \
+             ((iov = iov_iter_iovec(&(iter))), 1);              \
+             iov_iter_advance(&(iter), (iov).iov_len))
+
 unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to);
 
+size_t iov_iter_copy_from_user_atomic(struct page *page,
+                struct iov_iter *i, unsigned long offset, size_t bytes);
+size_t iov_iter_copy_from_user(struct page *page,
+                struct iov_iter *i, unsigned long offset, size_t bytes);
+void iov_iter_advance(struct iov_iter *i, size_t bytes);
+int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
+size_t iov_iter_single_seg_count(const struct iov_iter *i);
+
+static inline void iov_iter_init(struct iov_iter *i,
+                        const struct iovec *iov, unsigned long nr_segs,
+                        size_t count, size_t written)
+{
+        i->iov = iov;
+        i->nr_segs = nr_segs;
+        i->iov_offset = 0;
+        i->count = count + written;
+
+        iov_iter_advance(i, written);
+}
+
+static inline size_t iov_iter_count(struct iov_iter *i)
+{
+        return i->count;
+}
+
 int memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len);
 int memcpy_toiovec(struct iovec *iov, unsigned char *kdata, int len);
+
 #endif