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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"shutil: add reflink=False to file copy functions to control clone/CoW copies (use copy_file_range)","articleBody":"BPO | [37157](https://bugs.python.org/issue37157)\n--- | :---\nNosy | @giampaolo, @albertz, @desbma, @koobs, @pablogsal\nFiles | \u003cli\u003e[cow.diff](https://bugs.python.org/file48390/cow.diff \"Uploaded as text/plain at 2019-06-05.05:02:23 by @giampaolo\")\u003c/li\u003e\u003cli\u003e[cow2.diff](https://bugs.python.org/file48393/cow2.diff \"Uploaded as text/plain at 2019-06-05.10:45:13 by @giampaolo\")\u003c/li\u003e\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = None\ncreated_at = \u003cDate 2019-06-04.21:36:40.594\u003e\nlabels = ['library', '3.9', 'performance']\ntitle = 'shutil: add reflink=False to file copy functions to control clone/CoW copies (use copy_file_range)'\nupdated_at = \u003cDate 2021-10-07.19:23:42.385\u003e\nuser = 'https://github.com/vstinner'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2021-10-07.19:23:42.385\u003e\nactor = 'vstinner'\nassignee = 'none'\nclosed = False\nclosed_date = None\ncloser = None\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2019-06-04.21:36:40.594\u003e\ncreator = 'vstinner'\ndependencies = []\nfiles = ['48390', '48393']\nhgrepos = []\nissue_num = 37157\nkeywords = ['patch']\nmessage_count = 14.0\nmessages = ['344648', '344651', '344667', '344692', '344694', '344697', '344702', '344709', '350623', '384015', '384105', '403414', '403418', '403423']\nnosy_count = 6.0\nnosy_names = ['giampaolo.rodola', 'Albert.Zeyer', 'desbma', 'koobs', 'pablogsal', 'dulanic']\npr_nums = []\npriority = 'normal'\nresolution = None\nstage = None\nstatus = 'open'\nsuperseder = None\ntype = 'performance'\nurl = 'https://bugs.python.org/issue37157'\nversions = ['Python 3.9']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2019-06-04T21:36:41.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":43},"url":"https://github.com/81338/cpython/issues/81338"}