[coLinux-devel] [ colinux-Bugs-2152550 ] rsync cannot set mtime correctly on cofs

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Bugs item #2152550, was opened at 2008-10-08 05:29
Message generated for change (Comment added) made by henryn
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https://sourceforge.net/tracker/?func=detail&atid=622063&aid=2152550&group_id=98788

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Category: None
Group: v0.8.x (devel)
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Xuefer (xuefer)
Assigned to: Nobody/Anonymous (nobody)
Summary: rsync cannot set mtime correctly on cofs

Initial Comment:
$ cd ~
(native mount, non-cofs, good result)
$ rm -f a b; touch -d 1970-1-1 a ; rsync -a a b;  ls --full-time a b ; rm -f a b-rw-r--r-- 1 xuefer xuefer 0 1970-01-01 00:00:00.000000000 +0800 a
-rw-r--r-- 1 xuefer xuefer 0 1970-01-01 00:00:00.000000000 +0800 b

$ cd /c/tmp
(cofs mount, wrong result)
$ rm -f a b; touch -d 1970-1-1 a ; rsync -a a b;  ls --full-time a b ; rm -f a b-rwxr-xr-x 1 xuefer users 0 1970-01-01 00:00:00.000000000 +0800 a*
-rwxr-xr-x 1 xuefer users 0 2008-10-08 11:29:22.000000000 +0800 b*


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Comment By: Henry N. (henryn)
Date: 2008-10-27 23:55

Message:
This bug is fixed by SVN revision r1127 and has nothing to do with nocache
and Bug #2176188.
The parameter for set atime and mtime are swapped by wrong variable names.
The current snapshot http://www.colinux.org/snapshots/ includes this
change.

For rsync test have added "stat a b", this shows the swapped times. The
test script:
  cd /mnt/temp
  rm -f a b
  sleep 1
  touch -d 1970-1-1 a
  rsync -a a b
  ls --full-time a b
  stat a b

Before  r1127 (non interesting lines removed):
-rwxr-xr-x 1 root root 0 1970-01-01 00:00:00.000000000 +0000 a
-rwxr-xr-x 1 root root 0 2008-10-27 22:31:25.000000000 +0000 b
  File: `a'
Access: 1970-01-01 00:00:00.000000000 +0000
Modify: 1970-01-01 00:00:00.000000000 +0000
Change: 2008-10-27 22:31:27.000000000 +0000
  File: `b'
Access: 1970-01-01 00:00:00.000000000 +0000
Modify: 2008-10-27 22:31:25.000000000 +0000
Change: 2008-10-27 22:31:27.000000000 +0000

After  r1127 (non interesting lines removed):
-rw-r--r-- 1 root root 0 1970-01-01 00:00:00.000000000 +0000 a
-rw-r--r-- 1 root root 0 1970-01-01 00:00:00.000000000 +0000 b
  File: `a'
Access: 1970-01-01 00:00:00.000000000 +0000
Modify: 1970-01-01 00:00:00.000000000 +0000
Change: 2008-10-27 22:37:22.000000000 +0000
  File: `b'
Access: 2008-10-27 22:37:22.000000000 +0000
Modify: 1970-01-01 00:00:00.000000000 +0000
Change: 2008-10-27 22:37:22.000000000 +0000

The same script on /tmp (cobd), have same times:
-rw-r--r-- 1 root root 0 1970-01-01 00:00:00.000000000 +0000 a
-rw-r--r-- 1 root root 0 1970-01-01 00:00:00.000000000 +0000 b
  File: `a'
Access: 1970-01-01 00:00:00.000000000 +0000
Modify: 1970-01-01 00:00:00.000000000 +0000
Change: 2008-10-27 22:56:18.000000000 +0000
  File: `b'
Access: 2008-10-27 22:56:18.000000000 +0000
Modify: 1970-01-01 00:00:00.000000000 +0000
Change: 2008-10-27 22:56:18.000000000 +0000


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Comment By: Henry N. (henryn)
Date: 2008-10-26 21:55

Message:
This is a duplicate of bug# 2176188 "file sync wrong on cofs".

Rsync creates temporally files like ".b..b8jlLdx". Than rsync tries to
change attributes after rename.
The rename is not complete from async file close, so the file can't reopen
shortly for time modifications.

As workaround you can add "nocache" to the mount options, then it works.


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