Programming :: Finding Available Space In A Volume?
Nov 15, 2010
Given the name of a mounted volume (e.g., /mnt/vol), how would I determine its capacity and available space in C? I've been googling for a while now and nothing jumps out as the solution. I can use getmntent() to get the name of the actual partition that is associated with the mount point, e.g. /dev/sda2, but I can't figure out how to find the capacity of the volume nor how much space is remaining, such as what the df command shows. Is there an ioctl defined to get this information or some other system call?
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Oct 18, 2009
The space in the volume name seems to disagree with fstab and terminal, I can't change the volume name either as I do not have access to Windows at this time. Is there a way I can help fstab or the terminal to recognize the space in part of the volume name?
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Jan 1, 2010
so i have f12 installed on my hd with lvm using the whole extent of the HD , i want to reduce it so i can dual boot it with a windows system, i managed to reduce the logical volume to free some space, but i cant seem to reduce the physical volume, is this possible and how ?
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Dec 13, 2010
I am developing a I2C CDROM client driver. The CDROM firmware supports TOC information read through a I2C command. It sends the TOC information in burst ( Interrupts a GPIO pin when it is ready ) and my CPU does a I2C read to read the TOC. When the CDROM firmware finishes sending the last data burst , it informs my CPU that it is done with the TOC, by a flag in the last data burst. I would like to know, which is the most efficinet way I can send these TOC information to userspace?
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Jul 7, 2009
I wanna write a file in kernel space but from my searching I can to know that instead of writeing file in kernel space ,I can write data to user space by copy_to_user space.
But link is missing ...I dont know how will my user space will access kernel space means my function in kernel space which will do copy_to_user /....How my user space function will call my kernel level function ..
Can any one of you provide me with some example file which are doing this .I know every char driver is using it ...but i could not trace back how user level function is accessing it ...i m confused between user space and kernel space.
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Jul 14, 2009
How to use execv from kernel space to call a user space program writtenfor socket prog.
I tried to write code for socket in kernel but its not working.
Socket code in kernel is also needed.
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Nov 13, 2009
My computer: (Lenovo T61 Thinkpad, running fc11 for about 2 and half months). Apparently I when I made my partitions I didn't leave quite enough room in my root directory, because I just completely ran out. Here is how my hard drive is partitioned:
1 physical volume group (sda)
4 logical volumes (home, root, swap, var)
The root had about 15 gigs on it, which just filled up. When I restarted to see if that would help, when it rebooted it went fine up to the log-in screen. Instead of the usual fedora blue background, it was black except for the log-in window, which looked very low-res. A little pop-up kept coming up saying the GNOME power configuration settings failed to load or something. When I logged in, the whole screen was black except for the mouse, and I could get no response. I have plenty of space left in home, so I rebooted to rescue mode using the first fedora installation disk, and tried the following command:
Code:
lvreduce -L90G /dev/mapper/DRIVE
which only returned:
Code:
lvreduce: relocation error: lvreduce: symbol dm_tree_node_size_changed, version Base not defined in file libdevmapper.so.1.02
So I couldn't reduce the size of home, and thus couldn't increase the size of root.
IN SUMMARY:
a) the lack of memory in root the probable cause for my computer not working
b) there a good way to reduce home and increase root while running this live disk
Note: When I am looking at it now in the logical volume manager, it says that on the whole physical volume there is only 400MB free. However, when I last looked (about 30 mins before I started having problems) it said there were about 100 Gb free.
Edit: Nevermind. I did some more research and it turned out to be more of a gnome power manager thing rather than a memory space thing, although I'm certainly going to increase my root memory now.
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Jun 14, 2010
I just read and learned about logical volume management today. I have a server running RHEL5.4, LVM2. I have 1 physical volume, with one volume group, and 3 logical volumes. I have no free extents, nor do I have any in my volume group (not sure if it's possible to have free in one and not the other anyway), and I am running out of space on one of my logical volumes. Doing a df -h shows 96% of 9.7GB used on /dev/mapper/MainVG-root, mounted at /. So here's the stupid question: how can I find out what directories/files are taking up what space within this logical volume? As I said I have 3 all together, and the other 2 are mapped to /var and a /var pgsql sub-directory. I figured I could get the sizes of the other directories under / and drill down accordingly, but I seem to be missing some basic rule because the commands I am using and the values I am getting don't add up.
For example, it seemed logical to me to do an ls -lsh on / to try and identify the largest directories. Each directory is listed as being ~4-8K in size. That doesn't make sense to me. So I decided to do a du -sh on each directory. Having done this on all of the / sub-directories and added up those values, there is not enough reported usage here to equal 8.9GB of used space (as df -h / reports).how they would find out how the 9.7GB here is being allocated? Preferably without scripts as I am not ready to add a layer of complexity to this yet without understanding some fundamentals.
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Jul 21, 2011
I have the following requirement in my module. The driver gets some data from the external device. After getting 1MB of data it has to send it to the user space application. What is the best thing to implement for this in driver.? Is it ok to implement like, after getting data, the driver will send a signal to the user space application. Then the user space application sends an ioctl to read the data. Is there any alternate, that the driver directly sends the data without the user space application asks for it.?
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Sep 13, 2010
Ubuntu 10.04.1 I was just tidying up my panel when I notice the Volume icon is taking up the space of two icons: I can right-click and Move it to the left or right
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Jun 2, 2010
HPDL385 with dual raid controllers (8 disks each). During the install of the ISO, it sees the raid controllers individually. I tried "One Generic Drive" but it still only partitions one of the raid controllers.Is it possible after the OS is installed to configure the space as one logical volume?
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Feb 7, 2011
I plan to install a server using LVM. I thought a partition schema where /boot would be in an ext4 partition while / /usr /var /home and /opt would be in the LVM. My question is: if I'm putting / into the LVM, is it necessary to divide /usr /var /home and /opt into different logical volumes? If I divide them, would it become harder to maintain when new disk space has to be added to the volume group?
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Sep 16, 2010
Is is possible to extend physical volume disk space from one to another?
Quote:
PV VG Fmt Attr PSize PFree
/dev/sda1 Zeus-extra lvm2 a- 149.05G 17.05G
/dev/sdb1 Zeus-misc lvm2 a- 394.96G 274.96G
Could I get 50GB from /dev/sdb1 and add it to /dev/sda1 ???
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Feb 28, 2011
I'm getting an error message that something along the lines of "volume "filesystem root" has only 25mb space remaining". How do I increase the volume size so I never have to worry about it again? This is the 3rd time I've tried ubuntu and it's sticking more and more but this has me thoroughly perplexed. I've got a 320GB HDD partitioned 3 times with a Linux partition being 7GB.
Dual booting Win7Pro.
Running ubuntu 10.10 64-bit
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Jul 1, 2011
I have a 500 GB hard drive connected via a SATA/USB adapter. After connecting it, I did a basic format of the drive with no problem. I then attempted the "Wipe Free Space" option under the File menu in BleachBit, selecting the external drive, and it began the process. It gives me a time estimate of about 300 minutes, but, instead, after a few minutes it says "Done" and gives me the message "[Errno 27] File too large. Disk space recovered: 0 Files recovered: 0 Errors: 1"
What happened? What do I need to do to get this volume wiped?
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Nov 18, 2010
My fedora keeps popping up this message of Low disk space..the volume file system roots has only 200 MB remaining.Then it came to 150 MB and now to 100MB.I am using fedora 13 on vmware .I set my vmware hard disk to 20 GB... my file system is showing 100 MB free while my home has 12.3GB free. Is there a way increase the size of my file system. similar problem has been in ubuntu [URL] but I dont know what to do with fedora.Also can some one tell me the way I can increase the size of usr folder .so that I can get some more softwares.Right now I am just stuck.
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Mar 28, 2010
extend the size of a LVM2 volume group over the remaining free space available on a physical volume. My linux box is a Ubuntu Karmic 9.10 64bit, the 60GB hard disk has 2 win partition for about 19GB, a 1.5GB ext3 boot partition and finally a 36GB LVM partition (/dev/sda4) on which I created a volume group (volgrp) smaller 10GB than the 36GB physical volume (/dev/sda4). What I want now is to extend the size of volume group up to the end of physical volume. I tried to use the "vgextend volgrp /dev/sda4" but system answers me
with following output:
me@pc:~> sudo vgextend volgrp /dev/sda4
Physical volume '/dev/sda4' is already in volume group 'volgrp'
Unable to add physical volume '/dev/sda4' to volume group 'volgrp'.
Here the output of fdisk command:
me@pc:~> sudo fdisk -l
Disk /dev/sda: 60.0 GB, 60011642880 bytes
255 heads, 63 sectors/track, 7296 cylinders
[code]...
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Jun 5, 2009
I've added a new LUN to my Centos 5.2 server using Powerpath and have added it to an ext3 logical volume. I extended the logical volume using lvextend and the new space shows up correctly in lvdisplay. What I'm having problems with is getting Centos to see the new disk space (df -h shows 500GB, not 600GB as expected). I've tried running a resize2fs on the new volume but it tells me that "the filesystem is already n blocks long. Nothing to do". Does any one know where I'm going wrong? If possible I'd like to sort this without a reboot.
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Jan 8, 2010
using Ubuntu file browser, I browsed my Windows network and logged on to a Windows PC. Now Ubuntu file browser shows me "C$ on WinPC" as a folder. I can open it, read/write files, etc.But from bash prompt, I don't see anything of type CIFS/SMBFS listed in the output of "mount". Only the usual suspects (like local CDROM). How can refer to Windows files from Linux commandline?
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May 9, 2010
I know how to manage them from a commandline but I was wondering if there are any graphical partition editors that understand and work with lvm2?
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Sep 14, 2009
Im an academic (university networks and security lecturer) studying/teaching network and operating system security, and inspired by the work of Hovav Shacham set about testing ASLR on linux. Principley I did this by performing a brute force buffer overflow attack on Fedora 10 and Ubuntu 9. I did this by writting a little concurrent server daemon which accidently on purpose didnt do bounds checking.
I then wrote a client to send it a malicious string brute forcing guessed addresses which caused a return-to-libc to the function usleep with a parameter of 16m causing a delay of 16 seconds as laid out in [URL] Once I hit the delay I new I had found the function and could calculate delta_mmap allowing me to create a standard chained ret-to-libc attack. All of that works fine. However .... To complete my understanding I am trying establish where I can find the standard base address for ubuntu 9 (and other distros) for the following, taken from Shacham:-
Quote:
[code]....
/proc/uid/maps gives me some information but not the base address ldd also gives me the randomised starting address for sections in the user address space but neither gives me the base address. Intrestingly ... when a run ldd with aslr on for over (about) 100 times and checked the start point of libc I determined that the last 3 (least significant) hex digits were always 0's and the fist 4 (most significant) where between 0xB7D7 and 0xB7F9. To me this indicated that bits 22-31 were fixed and bits 12-21 were randomized with bits 11-0 fixed. Although even that doesnt define the boundaries observed correctly.
Note: I am replicating the attack to provide signatures to detect it using IDS, and for teaching purposes. I am NOT a hacker and if needed to could reply from my .ac.uk email address as verification.
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Apr 25, 2010
When I logged in today I got this message:
The volume "filesystem root" has only 474.8 MB disk space remaining
What does this mean??
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May 18, 2011
I've got a question on free disk space. I'm currently running CentOS 5.5 on in Xenserver virtual environment. We've had an issue with disk space. My question is as follows: - from a ssh connection i run df -h this gives the value of 90% used leaving me with 9GB. If I use system monitor via a VNC connection the free disk space value is 20GB free on the same volume. Which one is correct? I do use SNMP to monitor the same volume and should alert me when < 10% is free I know this works as I set the alert threshold to < 90% I get an alert.
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Dec 7, 2010
Lucid on an Acer Travelmate800.Can anyone tell me why I have 0k for swap space? I allocated swap which I can see in my Disk Utility's 'volumes' display.
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Feb 27, 2011
When I boot up my PC which is running Ubuntu 10 I get an error message. The volume "Boot" has 0 space.
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Feb 27, 2011
When I boot up my PC which is running Ubuntu 10 I get an error message.
The volume "Boot" has 0 space.
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Jan 4, 2010
Logical Memory Space of 4GB is divided in to 3GB User Space and 1GB Kernel Space. Always. Correct?
1. How can we change it? (just changing value of PAGE_OFFSET is okay?)
2. If system have only 256MB of memory (embedded system) and suppose Kernel Modules eat away all the memory during boot. User space will be left will no memory. Is this case possible?
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Sep 29, 2010
I am interfacing ADE7758 to At91sam9261 spi interface. Linux 2.6.28 is running on my custom board. have driver for this 12-bit ADC (ADE7758) on linux ?
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May 10, 2010
I have a file in which I have string called "already there" in some line of it. I want that if the string is present enter some loop..
like
if(( grep "already there" $file is true ))
then
--
--
fi
But the thing is when I make grep it gives the whole line in which this string is present and gives some error: if[ grep "already there" file ]: command not found. I am very new to shell scripting.
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Nov 10, 2010
I am using the following to find the Day of the Week on my server which is in UTC.
Code:
But say if I want to find the Day of the Week in another timezone, how would one go about it. I had a look at date --help but could not find any timezone related switches so am not sure if this is possible using this method.
Update:
This appears to work but is this the only way?
Code:
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