2 files changed, 37 insertions, 0 deletions

diff --git a/fs/libfs.c b/fs/libfs.c
index ea9a6cc9b35c..232bea425b09 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -547,6 +547,40 @@ ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos,
 }
 
 /**
+ * simple_write_to_buffer - copy data from user space to the buffer
+ * @to: the buffer to write to
+ * @available: the size of the buffer
+ * @ppos: the current position in the buffer
+ * @from: the user space buffer to read from
+ * @count: the maximum number of bytes to read
+ *
+ * The simple_write_to_buffer() function reads up to @count bytes from the user
+ * space address starting at @from into the buffer @to at offset @ppos.
+ *
+ * On success, the number of bytes written is returned and the offset @ppos is
+ * advanced by this number, or negative value is returned on error.
+ **/
+ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
+                const void __user *from, size_t count)
+{
+        loff_t pos = *ppos;
+        size_t res;
+
+        if (pos < 0)
+                return -EINVAL;
+        if (pos >= available || !count)
+                return 0;
+        if (count > available - pos)
+                count = available - pos;
+        res = copy_from_user(to + pos, from, count);
+        if (res == count)
+                return -EFAULT;
+        count -= res;
+        *ppos = pos + count;
+        return count;
+}
+
+/**
  * memory_read_from_buffer - copy data from the buffer
  * @to: the kernel space buffer to read to
  * @count: the maximum number of bytes to read
@@ -864,6 +898,7 @@ EXPORT_SYMBOL(simple_statfs);
 EXPORT_SYMBOL(simple_sync_file);
 EXPORT_SYMBOL(simple_unlink);
 EXPORT_SYMBOL(simple_read_from_buffer);
+EXPORT_SYMBOL(simple_write_to_buffer);
 EXPORT_SYMBOL(memory_read_from_buffer);
 EXPORT_SYMBOL(simple_transaction_set);
 EXPORT_SYMBOL(simple_transaction_get);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 44f35aea2f1f..948bd2bfb1de 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2362,6 +2362,8 @@ extern void simple_release_fs(struct vfsmount **mount, int *count);
 
 extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
                         loff_t *ppos, const void *from, size_t available);
+extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
+                const void __user *from, size_t count);
 
 extern int simple_fsync(struct file *, struct dentry *, int);