check disk usage
Hi,
My root filesystem is jffs2, which is mounted by kernel getting booting parameters "root=/dev/mtdblock3 rw" from the command line. I noticed that running 'df -k' only shows the usage of those devices that are mounted explicitly by 'mount' command but not the root filesystem. The following is the result of 'df -k' running on busybox-0.60.2.
# df -k Filesystem 1k-blocks Used Available Use% Mounted on /dev/mtdblock0 16384 688 15696 4% /usr /dev/mtdblock1 16384 5836 10548 36% /home /dev/mtdblock2 16384 652 15732 4% /var
On a regular linux system, e.g. RedHat, we do get information about the usage of the root filesytem, right?
Is this a problem? If it's is, is it related to jffs2 or busybox?
Thanks,
Shawn.
Quoted 14 lines · Xiaogeng (Shawn) Jin
Hi,
My root filesystem is jffs2, which is mounted by kernel getting booting parameters "root=/dev/mtdblock3 rw" from the command line. I noticed that running 'df -k' only shows the usage of those devices that are mounted explicitly by 'mount' command but not the root filesystem. The following is the result of 'df -k' running on busybox-0.60.2.
# df -k Filesystem 1k-blocks Used Available Use% Mounted on /dev/mtdblock0 16384 688 15696 4% /usr /dev/mtdblock1 16384 5836 10548 36% /home /dev/mtdblock2 16384 652 15732 4% /var
Quoted 4 lines
On a regular linux system, e.g. RedHat, we do get information about the usage of the root filesytem, right?
Is this a problem? If it's is, is it related to jffs2 or busybox?
Have you checked the strace output of df -k? As far as I can see, it looks in /proc/mounts. Maybe this is of some help to you.
Regards,
Tino
Signature · 4 lines
[email protected] dipl.-inf. Innominate Security Technologies AG software engineer networking people tel: +49.30.6392-3308 http://www.innominate.com/
Haven't used busybox in a while, but when using "the real thing" the following applies, and it might apply to busybox mount as well:
This problem is caused by a /etc/mtab not beeing in synch with your actual mounts.
There is two ways to go about this
a) Propely set up /etc/mtab when booting. This is done by when having /etc/mtab writeable, clear it, and then redo all mounts done up to that point by using the -f option to only update /etc/mtab.
b) Do not use a real /etc/mtab. Link it to /proc/mounts. For details and limitations of not using a mtab see the mount(1) man page.. almost all setups can work just fine without a real mtab.
Regards
Henrik
Quoted 19 lines · Xiaogeng (Shawn) Jin
Quoted 18 lines
Hi,
My root filesystem is jffs2, which is mounted by kernel getting booting parameters "root=/dev/mtdblock3 rw" from the command line. I noticed that running 'df -k' only shows the usage of those devices that are mounted explicitly by 'mount' command but not the root filesystem. The following is the result of 'df -k' running on busybox-0.60.2.
# df -k Filesystem 1k-blocks Used Available Use% Mounted on /dev/mtdblock0 16384 688 15696 4% /usr /dev/mtdblock1 16384 5836 10548 36% /home /dev/mtdblock2 16384 652 15732 4% /varOn a regular linux system, e.g. RedHat, we do get information about the usage of the root filesytem, right?
Is this a problem? If it's is, is it related to jffs2 or busybox?
Quoted 3 lines
b) Do not use a real
/etc/mtab. Link it to/proc/mounts. For details and limitations of not using a mtab see the mount(1) man page.. almost all setups can work just fine without a real mtab.
Thanks a lot. I did in this way to solve the problem.
Shawn.