Merge branch 'drm-fixes-3.16' of git://people.freedesktop.org/~agd5f/linux into drm...

[firefly-linux-kernel-4.4.55.git] / include / linux / uio.h

diff --git a/include/linux/uio.h b/include/linux/uio.h
index e2231e47cec131f8de84459568b11aa6d294f62d..09a7cffc224e2d8293d747255db856427e105925 100644 (file)
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -94,8 +94,20 @@ static inline size_t iov_iter_count(struct iov_iter *i)
        return i->count;
 }
 
-static inline void iov_iter_truncate(struct iov_iter *i, size_t count)
+/*
+ * Cap the iov_iter by given limit; note that the second argument is
+ * *not* the new size - it's upper limit for such.  Passing it a value
+ * greater than the amount of data in iov_iter is fine - it'll just do
+ * nothing in that case.
+ */
+static inline void iov_iter_truncate(struct iov_iter *i, u64 count)
 {
+       /*
+        * count doesn't have to fit in size_t - comparison extends both
+        * operands to u64 here and any value that would be truncated by
+        * conversion in assignement is by definition greater than all
+        * values of size_t, including old i->count.
+        */
        if (i->count > count)
                i->count = count;
 }
@@ -111,6 +123,9 @@ static inline void iov_iter_reexpand(struct iov_iter *i, size_t count)
 
 int memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len);
 int memcpy_toiovec(struct iovec *iov, unsigned char *kdata, int len);
-
+int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov,
+                       int offset, int len);
+int memcpy_toiovecend(const struct iovec *v, unsigned char *kdata,
+                     int offset, int len);
 
 #endif