new helper: alloc_file_clone()
alloc_file_clone(old_file, mode, ops): create a new struct file with
->f_path equal to that of old_file. pipe converted.
Acked-by: Linus Torvalds <[email protected]>
Signed-off-by: Al Viro <[email protected]>
diff --git a/fs/file_table.c b/fs/file_table.c
index 6b37239..78b067d 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -211,6 +211,17 @@ struct file *alloc_file_pseudo(struct inode *inode, struct vfsmount *mnt,
}
EXPORT_SYMBOL(alloc_file_pseudo);
+struct file *alloc_file_clone(struct file *base, int flags,
+ const struct file_operations *fops)
+{
+ struct file *f = alloc_file(&base->f_path, flags, fops);
+ if (!IS_ERR(f)) {
+ path_get(&f->f_path);
+ f->f_mapping = base->f_mapping;
+ }
+ return f;
+}
+
/* the real guts of fput() - releasing the last reference to file
*/
static void __fput(struct file *file)
