Title: st_ino (unsigned long long) is casted to long long in posixmodule.c:_pystat_fromstructstat
Type: behavior Stage:
Components: Versions: Python 3.7, Python 3.6, Python 3.5, Python 2.7
Status: open Resolution:
Dependencies: Superseder:
Assigned To: Nosy List: eryksun, haypo, mba, serhiy.storchaka, steve.dower, xiang.zhang
Priority: normal Keywords:

Created on 2017-02-22 12:24 by mba, last changed 2017-03-18 06:32 by serhiy.storchaka.

Pull Requests
URL Status Linked Edit
PR 557 merged haypo, 2017-03-08 08:04
PR 584 merged haypo, 2017-03-09 16:41
Messages (5)
msg288355 - (view) Author: Mba (mba) Date: 2017-02-22 12:24
ino_t is of type 'unsigned long' or 'unsigned long long'. Casting it to signed type means that negative values are incorrectly returned for large inodes.
msg289213 - (view) Author: Xiang Zhang (xiang.zhang) * (Python committer) Date: 2017-03-08 07:36
Any reason our _Py_stat_struct on Windows uses a signed type to represent st_ino?
msg289216 - (view) Author: STINNER Victor (haypo) * (Python committer) Date: 2017-03-08 08:07
On Windows, _Py_attribute_data_to_stat() converts BY_HANDLE_FILE_INFORMATION to _Py_stat_struct, and then _pystat_fromstructstat() creates Python objects.

The file index in BY_HANDLE_FILE_INFORMATION is made of two DWORD, so yes, it's unsigned.

On Linux, stat.st_ino type is ino_t which is unsigned too.

So I created a pull request to fix the bug, even if I don't think that a filesystem produce inodes larger than 2^63-1. Not sure if it's worth it to backport the fix to Python 2.7, 3.5 and 3.6?
msg289221 - (view) Author: Serhiy Storchaka (serhiy.storchaka) * (Python committer) Date: 2017-03-08 09:24
I think it is worth to backport this at least to 3.6.
msg289288 - (view) Author: Mba (mba) Date: 2017-03-09 12:52
> I don't think that a filesystem produce inodes larger than 2^63-1

The problem is real: the large inode number was assigned to a file created by MacOS on a share exported via CIFS, and then stated by Linux using NFS export.
Date User Action Args
2017-03-18 06:32:45serhiy.storchakasetpull_requests: - pull_request599
2017-03-17 21:00:33larrysetpull_requests: + pull_request599
2017-03-09 16:41:36hayposetpull_requests: + pull_request481
2017-03-09 12:52:08mbasetmessages: + msg289288
2017-03-08 09:24:49serhiy.storchakasetnosy: + serhiy.storchaka
messages: + msg289221
2017-03-08 08:08:00hayposetnosy: + haypo
messages: + msg289216
2017-03-08 08:04:54hayposetpull_requests: + pull_request458
2017-03-08 07:36:06xiang.zhangsetnosy: + eryksun, steve.dower
messages: + msg289213
2017-02-22 12:55:43xiang.zhangsetnosy: + xiang.zhang

versions: - Python 3.3, Python 3.4
2017-02-22 12:39:48mbasetcomponents: - Library (Lib)
2017-02-22 12:24:02mbacreate