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ntfs-3g changes ctime and mtime on access

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ntfs-3g changes ctime and mtime on access

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Sion Joined: Sun Oct 11, 2015 21:26 Posts: 5	ntfs-3g changes ctime and mtime on access Hi. I'm using ntfs-3g on FreeBSD. All seems to work fine except one thing: any access to any file on NTFS partition (even simple reading with cat <filename> command) modifies not only atime (access time), but also ctime (change time) and mtime (modify time). Now I have timestamps damaged on all my photos after just watching them in thumbnails mode... Steps to reproduce problem: 1. Minimal FreeBSD 10.2 installation. 2. Install ntfs-3g package (pkg install sysutils/fusefs-ntfs) or compile ntfs-3g from /usr/ports. 3. Load fuse module (kldload fuse or add to /boot/loader.conf) 4. ntfs-3g /dev/ada0s5 /media/D 5. stat /media/D/some-small-file.txt - shows atime, ctime, mtime 6. cat /media/D/some-small-file.txt - simple reading with cat 7. stat /media/D/some-small-file.txt - shows that ctime and mtime are updated to current time.
Sun Oct 11, 2015 21:44

jpa NTFS-3G Lead Developer Joined: Tue Sep 04, 2007 17:22 Posts: 1286	Re: ntfs-3g changes ctime and mtime on access Hi, Quote: any access to any file on NTFS partition (even simple reading with cat <filename> command) modifies not only atime (access time), but also ctime (change time) and mtime (modify time). Now I have timestamps damaged on all my photos after just watching them in thumbnails mode... I could not reproduce this on OpenIndiana (I do not have FreeBSD). I however found an issue which might be related to what you reported : Code: [root@openindiana]# echo data > test [root@openindiana]# stat test File: ‘test’ Size: 5 Blocks: 1 IO Block: 512 regular file Device: 4780001h/74973185d Inode: 89 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2015-10-14 10:39:02.545545000 +0200 Modify: 2015-10-14 10:39:02.549629000 +0200 Change: 2015-10-14 10:39:02.549629000 +0200 Birth: - [root@openindiana]# cat test data [root@openindiana]# stat test File: ‘test’ Size: 5 Blocks: 1 IO Block: 512 regular file Device: 4780001h/74973185d Inode: 89 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2015-10-14 10:39:02.545545000 +0200 Modify: 2015-10-14 10:39:02.549629000 +0200 Change: 2015-10-14 10:39:02.549629000 +0200 Birth: - Reading the file does not appear to change the access time. Digging into this showed that the file reading is not done by ntfs-3g. The data is just fetched from cache without ntfs-3g being notified. This is a bug in the OpenIndiana fuse kernel module which is a port from the FreeBSD one. Regards Jean-Pierre
Wed Oct 14, 2015 11:01

Sion Joined: Sun Oct 11, 2015 21:26 Posts: 5	Re: ntfs-3g changes ctime and mtime on access Thank you for attention... I tried to repeat the test inside virtual machine (VirtualBox 4.3.30). NTFS partition was created and formatted from Windows 7. Nothing except FreeBSD 10.2 and ntfs-3g was installed. But if you say that it is not ntfs-3g problem, all I can is trust you Thanks any way. Good luck.
Wed Oct 14, 2015 12:47

Sion Joined: Sun Oct 11, 2015 21:26 Posts: 5	Re: ntfs-3g changes ctime and mtime on access Seems like ctime and mtime are updated only on first access after reboot (or mounting partition?). Maybe this is why you can't reproduce problem? You have to use existing file or reboot after creating file... Sorry for bothering.
Wed Oct 14, 2015 13:19

jpa NTFS-3G Lead Developer Joined: Tue Sep 04, 2007 17:22 Posts: 1286	Re: ntfs-3g changes ctime and mtime on access Hi, Quote: Seems like ctime and mtime are updated only on first access after reboot (or mounting partition?). So most likely the cache management is part of the issue. On first access ntfs-3g is obviously called to get the data and feed the cache, but subsequent reads are served from the cache without ntfs-3g being notified. This does however not explain why mtime and ctime are updated instead of atime... I will try to fix the cache issue in the fuse kernel for OpenIndiana, but I will not be able to back-port to FreeBSD. AFAIK fuse for FreeBSD is not supported any more... Regards Jean-Pierre
Wed Oct 14, 2015 14:06

opsec Joined: Sun Oct 18, 2015 10:12 Posts: 2	Re: ntfs-3g changes ctime and mtime on access jpa wrote: AFAIK fuse for FreeBSD is not supported any more... To the contrary, it is part of the base operating system: https://svnweb.freebsd.org/base?view=re ... ion=241519
Sun Oct 18, 2015 10:19

jpa NTFS-3G Lead Developer Joined: Tue Sep 04, 2007 17:22 Posts: 1286	Re: ntfs-3g changes ctime and mtime on access Hi, Quote: Quote: jpa wrote: AFAIK fuse for FreeBSD is not supported any more... To the contrary, it is part of the base operating system: Then you have to report to whom is supporting the fuse kernel module... I have fixed the access time issue on OpenIndiana when data is cached following a write(), but the FreeBSD issue is different (attributes are not cached on FreeBSD). Regards Jean-Pierre
Sun Oct 18, 2015 14:55

Sion Joined: Sun Oct 11, 2015 21:26 Posts: 5	Re: ntfs-3g changes ctime and mtime on access No such problems with fusefs-exfat
Sat Oct 31, 2015 11:11

Sion Joined: Sun Oct 11, 2015 21:26 Posts: 5	Re: ntfs-3g changes ctime and mtime on access And even old ntfsmount works fine... Modifies atime after access, ctime/mtime only after editing file.
Sat Oct 31, 2015 12:32
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