kernel info:
Linux kylin-Vostro-260s 4.4.0-21-generic #37kord1kylin20160514 SMP Wed May
18 10:18:49 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
/sys/module/aufs:
kylin@kylin-Vostro-260s:/sys/module/aufs$ ls
coresize holders initsize initstate notes parameters refcnt sections
srcversion taint uevent version
kylin@kylin-Vostro-260s:/sys/module/aufs$ cat coresize
237568
kylin@kylin-Vostro-260s:/sys/module/aufs$ cat initsize
0
kylin@kylin-Vostro-260s:/sys/module/aufs$ cat initstate
live
kylin@kylin-Vostro-260s:/sys/module/aufs$ cat refcnt
3475
kylin@kylin-Vostro-260s:/sys/module/aufs$ cat srcversion
DA0A89DEEDADD82FB8A9636
kylin@kylin-Vostro-260s:/sys/module/aufs$ cat taint
kylin@kylin-Vostro-260s:/sys/module/aufs$ cat version
4.x-rcN-20160111
kylin@kylin-Vostro-260s:/sys/module/aufs$
this is mount information, I delete some cgroup and tmpfs info.
kylin@kylin-Vostro-260s:~$ cat /proc/mounts
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
udev/devdevtmpfsrw,nosuid,relatime,size=924724k,nr_inodes=231181,mode=755
0 0
devpts/dev/ptsdevptsrw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
0 0
tmpfs /run tmpfs rw,nosuid,noexec,relatime,size=189080k,mode=755 0 0
/dev/sda2 / aufs rw,relatime,si=9c2da998b3439525 0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs
rw,relatime,fd=24,pgrp=1,timeout=0,minproto=5,maxproto=5,direct 0 0
mqueue /dev/mqueue mqueue rw,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0
sunrpc /run/rpc_pipefs rpc_pipefs rw,relatime 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
/dev/sda1 /boot ext4 rw,relatime,stripe=4,data=ordered 0 0
tmpfs /run/user/1000 tmpfs
rw,nosuid,nodev,relatime,size=189080k,mode=700,uid=1000,gid=1000 0 0
gvfsd-fuse /run/user/1000/gvfs fuse.gvfsd-fuse
rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0
AUFS configration:
CONFIG_AUFS_FS=m
# CONFIG_AUFS_BRANCH_MAX_127 is not set
# CONFIG_AUFS_BRANCH_MAX_511 is not set
CONFIG_AUFS_BRANCH_MAX_1023=y
# CONFIG_AUFS_BRANCH_MAX_32767 is not set
CONFIG_AUFS_SBILIST=y
CONFIG_AUFS_HNOTIFY=y
CONFIG_AUFS_HFSNOTIFY=y
CONFIG_AUFS_EXPORT=y
CONFIG_AUFS_INO_T_64=y
# CONFIG_AUFS_XATTR is not set
# CONFIG_AUFS_FHSM is not set
CONFIG_AUFS_RDU=y
CONFIG_AUFS_SHWH=y
CONFIG_AUFS_BR_RAMFS=y
CONFIG_AUFS_BR_FUSE=y
CONFIG_AUFS_POLL=y
CONFIG_AUFS_BR_HFSPLUS=y
CONFIG_AUFS_BDEV_LOOP=y
actual operation:
kylin@kylin-Vostro-260s:~$ ls /etc/wyb
ls: cannot access '/etc/wyb': No such file or directory
kylin@kylin-Vostro-260s:~$ touch wyb
kylin@kylin-Vostro-260s:~$ cp wyb /etc/
cp: cannot create regular file '/etc/wyb': File exists
here should point out permission deny.
maybe these info are not necessay, but these is wrong.
here is "strace -o /tmp/s cp wyb /etc" info.
stat("/etc", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat("wyb", {st_mode=S_IFREG|0664, st_size=0, ...}) = 0
stat("/etc/wyb", 0x7ffc0c691890) = -1 ENOENT (No such file or
directory)
open("wyb", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0664, st_size=0, ...}) = 0
open("/etc/wyb", O_WRONLY|O_CREAT|O_EXCL, 0664) = -1 EEXIST (File exists)
lstat("/etc/wyb", 0x7ffc0c6919b0) = -1 ENOENT (No such file or
directory)
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=2995, ...}) = 0
read(4, "# Locale name alias data base.\n#"..., 4096) = 2995
read(4, "", 4096) = 0
close(4)
------------------ Original ------------------
From: "sfjro"<sf...@users.sourceforge.net>;
Date: Mon, Jun 27, 2016 11:01 AM
To: "é彦æ"<weiyan...@kylinos.cn>;
Cc: "aufs-users"<aufs-users@lists.sourceforge.net>;
Subject: Re: copy file
Hello,
> I use aufs filesystem as rootfs filesystem. the kylin user is a normal
> user, tips information is wrong when I copy file to super user
directory.
> I use some command, like this.
> kylin@kylin-os:~$ touch wyb
> kylin@kylin-os:~$ cp wyb /etc
> cp: cannot create regular file '/etc/wyb': File exists
I cannot reproduce.
Would you try "strace -o /tmp/s cp wyb /etc" and post /tmp/s file?
And these info are necessary.
(from aufs README)
- /proc/mounts (instead of the output of mount(8))
- /sys/module/aufs/*
- /sys/fs/aufs/* (if you have them)
- /debug/aufs/* (if you have them)
- linux kernel version
if your kernel is not plain, for example modified by distributor,
the url where i can download its source is necessary too.
- aufs version which was printed at loading the module or booting the
system, instead of the date you downloaded.
- configuration (define/undefine CONFIG_AUFS_xxx)
- kernel configuration or /proc/config.gz (if you have it)
- behaviour which you think to be incorrect
- actual operation, reproducible one is better
- mailto: aufs-users at lists.sourceforge.net
J. R. Okajima
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