fs: move kernel_read to fs/read_write.c

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 16 insertions, 0 deletions

diff --git a/fs/read_write.c b/fs/read_write.c
index 417dbe199505..1ea862bc7efd 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -415,6 +415,22 @@ ssize_t __vfs_read(struct file *file, char __user *buf, size_t count,
 }
 EXPORT_SYMBOL(__vfs_read);
 
+int kernel_read(struct file *file, loff_t offset, char *addr,
+                unsigned long count)
+{
+        mm_segment_t old_fs;
+        loff_t pos = offset;
+        int result;
+
+        old_fs = get_fs();
+        set_fs(get_ds());
+        /* The cast to a user pointer is valid due to the set_fs() */
+        result = vfs_read(file, (void __user *)addr, count, &pos);
+        set_fs(old_fs);
+        return result;
+}
+EXPORT_SYMBOL(kernel_read);
+
 ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
 {
         ssize_t ret;