vfs: export vfs_dedupe_file_range_one() to modules

This is needed by the stacked dedupe implementation in overlayfs.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/read_write.c b/fs/read_write.c
index cce4ebac34a83671f3777cb4b52026c035c1aca6..39b4a21dd9337a157927c1f8d0d741190de11e78 100644 (file)
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1964,9 +1964,8 @@ out_error:
 }
 EXPORT_SYMBOL(vfs_dedupe_file_range_compare);
 
-static int vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
-                                    struct file *dst_file, loff_t dst_pos,
-                                    u64 len)
+int vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
+                             struct file *dst_file, loff_t dst_pos, u64 len)
 {
        s64 ret;
 
@@ -2001,6 +2000,7 @@ out_drop_write:
 
        return ret;
 }
+EXPORT_SYMBOL(vfs_dedupe_file_range_one);
 
 int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same)
 {

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 019817a083a01a2d601af639a3d8017d9e36b600..b67209948f1bedaa8b0425f56c01456e95304e0c 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1829,6 +1829,10 @@ extern int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff,
                                         loff_t len, bool *is_same);
 extern int vfs_dedupe_file_range(struct file *file,
                                 struct file_dedupe_range *same);
+extern int vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
+                                    struct file *dst_file, loff_t dst_pos,
+                                    u64 len);
+
 
 struct super_operations {
        struct inode *(*alloc_inode)(struct super_block *sb);