Hello,
I was trying to backup a machine using tar and the --one-file-system option
and I was getting an archive without /dev, but tar was spitting :
/dev: file is on a different filesystem; not dumped
So, I had a look at the code in tar, and the comparison is done on the
stat.st_dev field...
I then wrote a simple program to stat("/", ...) and stat("/dev", ...),
and got :
For / :
st_dev : 769
st_ino : 2
st_mode : 16877
st_nlink : 23
st_uid : 0
st_gid : 0
st_rdev : 0
st_size : 4096
For /dev :
st_dev : 15
st_ino : 1117
st_mode : 16877
st_nlink : 23
st_uid : 0
st_gid : 0
st_rdev : 0
st_size : 165580
So, obviously, tar is right...
man 2 stat says :
The st_dev field describes the device on which this file resides.
and df -a reports :
[EMAIL PROTECTED] src]# df -a
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/hda1 7936256 3105556 4421048 42% /
proc 0 0 0 - /proc
sysfs 0 0 0 - /sys
devpts 0 0 0 - /dev/pts
tmpfs 517632 0 517632 0% /dev/shm
/dev/hda5 61787140 237360 58360480 1% /usr/local/witbe
/dev/hda2 4956316 142292 4558192 4% /var/log
none 0 0 0 -
/proc/sys/fs/binfmt_misc
So, obviously, /dev is on /, but the stat(2) says no.
Who is right, and where is the bug ?
Kernel 2.4 had it right : /dev was on /, no doubt.
Regards,
Paul
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