A filesystem is a way to organize and store computer files with their data.

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Taking file ownership when file and directory is readable/writable

I got some files in directory: drwxrws-wt 2 me mygroup 4,0K 10.1. 12:34 . -rw-r----- 1 someone mygroup 10G 10.1. 11:22 someonesfile me and someone are regular users without supplementary ...
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0answers
97 views

Span a directory on an SD card and an attached USB stick

Can I span a folder on the SD card on my Raspberry Pi with a folder on an attached USB device? I'd like to basically extend the size of a directory by using an attached USB memory stick. I'm running ...
19
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2answers
3k views

Why is JFS so obscure?

When I first got into using Slackware years ago I quickly learned to love JFS over ext3 or reiserfs given that it was reliable and if there was an unclean shutdown, its disk checking was very very ...
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1answer
331 views

find in /sys/class does not show everything, why?

Like every other person I am from time to time compelled to list the directory structure from a certain point int the filesystem. I do so with find /path/in/fs/ and this yields something like: /path/...
3
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2answers
823 views

Why do . and .. have a file size of 4 kB and 12 kB, respectively? [duplicate]

As displayed by ls -al, for example: drwxr-xr-x 9 jb jb 4.0K Mar 8 18:05 ./ drwx------ 49 jb jb 12K Mar 17 14:15 ../ I assume this is the minimum amount of space required to store the inode's ...
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2answers
691 views

Cannot access any files Manjaro Linux

I cannot open any files on my Manjaro Linux laptop. I really can't remember why it happened but I restarted my computer and now I dont have read/write access to any folder or file even though I've ...
7
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2answers
4k views

A clever way to defragment a FAT filesystem?

What is the best way to defragment a FAT filesystem when running Linux/Unix (on usb stick for instance)? Copy all content elsewhere, format, copy back again? Use FreeDOS defrag utility, in a KVM ...
3
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2answers
353 views

Redis-like temporary filesystem

Is there temporary file system (or ramdisk) that behaves like redis/memcache? so if there is not enough memory, i will dump to disk, when the computer restarted, it could read back from disk
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1answer
256 views

/dev/shm/ecryptfs-$USER-Private keeps climbing in Kubuntu 12.10 Install

I'm having a problem with an installation of Kubuntu 12.10 with an encrypted home directory. I've been trying to figure it out for several weeks. For transparency, I'll note here that I posted this ...
2
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2answers
1k views

Debian won't boot: udevd fails to load device sda and sdb

I can't boot my Debian system, I got this error during boot up: Driver 'pcspkr' is already registered, aborting. I have solved this by adding blacklist snd-pscp to /etc/modprobe.d/blacklist.conf (...
3
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1answer
323 views

How to place big file on two disks without splitting?

I have a file 100gb in size and a server with two 72gb disk's. The server runs Ubuntu Linux, with ext4 on the disks, and without LVM. How I can put the 100gb file on the server with 72+72gb disk's? ...
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1answer
296 views

File attributes does not exist in Linux? [closed]

There is no equivalent of Window's file attributes for Linux ?
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1answer
585 views

In Dolphin file manager Fedora 17, what is the shortcut to create folder?

In Dolphin file manager Fedora 17, what is the shortcut to create the new folder. E.g. Ctrl + Shift + N creates new folder in Windows 7
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0answers
210 views

How can I delete data from in a hexdump file from one offset to another?

I've created a disk image which was zeroed, formatted to ext4 file system, and then had several various files copied to it. I'm trying to extract these files using a combination of xxd and dd, but ...
4
votes
2answers
7k views

Mount HTTP Server As File System

I have a machine on which I wish to mount multiple remote servers to access them all centrally. For remote Linux based systems I am using SSHFS which works fine. But for Windows systems, or systems ...
0
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1answer
5k views

Log4j File Location

I have a Webapp running on an Amazon EC2 Linux AMI. I've been trying to configure my Log4J file for logging but haven't been able to figure out where the logs are getting created. This is my log4j ...
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2answers
317 views

Writing a Linux file system for NFS

I want to write my own custom file system in Linux. Can I share it over standard NFS without making any changes to the local NFS server? If so what VFS APIs are required to be implemented by my file ...
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2answers
1k views

How to make a path world-readable?

To make some item X world-readable, it is not enough for it to have the right permissions: each component of the absolute path leading to it must also have the right permissions. (My understanding, ...
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1answer
3k views

Is it possible to disable file permissions on a ext3 or ext4 file-system?

Is it possible to disable file permissions on an ext3/4 file-system? Just wondering if it's possible to completely disable or ignore file permissions on a ext3 or ext4 file system. Perhaps a mounting ...
11
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3answers
48k views

How can I expand ext4 partition size on debian

I have a drive with this configuration: fdisk -l Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size ...
9
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4answers
10k views

Should a laptop user switch from ext4 to btrfs?

Related to this. I'd like to take advantage of an OS switch to upgrade to BTRFS. BTRFS claims to offer a lot (data-loss resiliency, self-healing if RAID, checksumming of metadata and data, ...
13
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3answers
1k views

Horrible situation - file systems mounted simultaneously by multiple independent OS instances

How do I get out of this situation safely? Details are as follow: A xen server has got block devices allocated to VMs. But these devices have also been mounted inside Xen. In fact 44 of these ...
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4answers
6k views

How can I delete a folder with lots of subfolders fast?

I have a folder with 266778 subfolders. How can I delete it? I have tried cd ~/.local/share/Trash/ sudo rm -rf * but it takes much time. After 1 minute 25 seconds real time and 0.072 seconds user ...
0
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1answer
114 views

Debian VirtualBox Guest - Common Files to Remove for Space Saving?

I have created a VirtualBox guest using debian-6.0.7-amd64. I am using it as a clone template to create Java work nodes, so my needs are pretty much limited to the JVM, networking, SSH and the basics ...
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2answers
762 views

how can “several file nodes” be associated with a single inode?

I am trying to learn about iNodes and file permissions. I thought that there is one inode that holds the permissions for a single file. The OS pulls a single inode into memory to check permissions for ...
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3answers
170 views

Control how linux deletes files

What exactly happens when an application deletes a file? Is there any way to control this behavior? Basically I want to shred instead of rm in all cases, but of course applications do not make calls ...
5
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1answer
971 views

Preventing access blocking while external HDD spins up? [closed]

I have an old laptop where I installed Debian along with a samba server which I am using to share read-write access to 4 external hard drives, which I use to stream my media from. All works fine, ...
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0answers
37 views

Reasons for choosing primary over logical partitions [duplicate]

I guess anyone knows the benefits of logical volumes. But are there any reasons why I should choose primary partitions if I can?
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4answers
1k views

Is Gobolinux active any more?

Today I hear about existence of a revolutionary distro named Gobolinux. I am very interested and excited about it (in particular its file structure). Unfortunately it is not updated for a while. ...
3
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1answer
176 views

reasons for a dd image of an almost-empty drive not be small after gzip

i just cleaned a 50GB partition with dd if=/dev/zero of=/dev/sda1 then added some data to it (actually installed a linux distro) some 3Gb on ext4. and decided to make a image. dd if=/dev/sda1 | ...
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2answers
99 views

Changes to files don't show up until the partition is unmounted

I have a FAT32 filesystem mounted. After changing a file on it, I can read the file back and still see the old version. My changes don't actually persist until I unmount and remount the partition. Is ...
2
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0answers
135 views

Why does my Pandaboard boot partition need to be vfat, and the rootfs need to be ext3 or ext4?

While booting Android on a Pandaboard, I am partitioning the SD card into two partitions, boot and root. They contain different filesystems. Why does the boot partition need to be vfat, while the ...
3
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1answer
150 views

md5sum change after mount?

I have a ext3 filesystem on a .img file. After mounting and unmounting it, I noticed that the md5sum is changed, even if no file inside was changed! md5sum myfilesystem.img XXXX myfilesystem.img ...
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2answers
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cannot touch -m a writable file

Can someone explain why I get permission denied when running touch -m on this file even though it is group writable and I can write to the file fine. ~/test1-> id uid=1000(plyons) gid=1000(plyons) ...
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2answers
27k views

How to extract boot.img?

I am trying to see the content in a boot.img file from an Android image. I googled and found this article to extract system.img, but it doesn't work for boot.img. When trying to do this for boot.img, ...
2
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1answer
554 views

Why do inode-based file systems NOT need reboot after updating library versions? [duplicate]

I am trying to understand what an inode is. However, this passage from Wikipedia puzzles me: Installation of new libraries is simple with inode filesystems. A running process can access a library ...
4
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3answers
291 views

How to prohibit from changing an owner of modifiable files?

I sometimes need to run a Qt Creator from root. After that, some config files of Qt Creator suddenly have a root as an owner. Therefore when running Qt Creator as user, I am getting nag warnings about ...
2
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2answers
1k views

dynamic file system with hooks

Is there anyway in linux (I don't care which distribution or flavor) to have a dynamic file system with read/write hooks? For example I would like to mount a dynamic file system at /dynamic and ...
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1answer
383 views

Can a overlay/union file system be used as makeshift deduplication?

Given a union file system (mhddfs, unionfs, aufs) would it save me anything if I overlaid a writable file system over one with a bunch of ISO files, say Ubuntu 10.04, and then use zsync to update the ...
5
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2answers
2k views

Is there any performance penalty to having multiple segments for one volume in LVM?

We have a big drive that we've split up using LVM. We allocated one segment to the root filesystem and several other segments to other filesystems. Then we wanted to add more space to the root ...
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3answers
215 views

Circumvent permissions of filesystem on an external drive

Suppose that I have only non-root access on a desktop Linux machine. I want to work with an external, pluggable storage device (hdd, flash drive or memory card) with an ext{2,3,4} file system. Since ...
0
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1answer
66 views

see actual partitions usage

I have recently learned that ext3 (or some other filesystems) reserve some space of a drive by default for previliged processes. One can change this by doing the following: # tune2fs -m 4 /dev/sdXY ...
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3answers
444 views

Can a mounted encrypted filesystem be safe from root?

I have access to a shared remote computer from which I would like to run some code I have written which uses an interpreter (not a compiled code). I would like to protect this source code from other ...
0
votes
1answer
212 views

What is Linux for OpenVMS DIRECTORY/NOHEADING/NOTRAILING?

OpenVMS DCL command DIRECTORY/NOHEADING displays just the full file name including path info in a single-column format without any of the normal headings for a directory listing. The /NOTRAILING ...
13
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2answers
528 views

How can I be sure that a directory or file is actually deleted?

I know that most files, when deleted, aren't actually removed from the disk, and can be recovered later. How can I ensure that a directory I had deleted will actually be removed from the disk? Are ...
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0answers
2k views

How to set up ZFS with ZIL and L2ARC SSD?

I have been considering bcache and flashcache. However my friend suggested me something called ZFS. In fact it says that formating disk with ZFS can actually do the exact same thing without kernel ...
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2answers
2k views

Storing thousands of files in one directory

I have a web-site that I'm checking for performance issues and bugs, and i came across a caching code that caches thousands of files into one single directory. I understand that this is not good and ...
29
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1answer
10k views

Purpose of /dev/zero?

I tried to cat /dev/zero, and it didn't seem to do anything. I googled /dev/zero, and it says it's basically a blank file with infinite size. Is cat printing an infinite number of non-existent ...
2
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1answer
5k views

Resize ext4 partition to create more inodes? [duplicate]

Possible Duplicate: How can I increase the number of inodes in an ext4 filesystem? An old headless no-X backup server I use has a small hard drive with three primary ext4 partitions: /, /home ...
5
votes
1answer
3k views

updating `/etc/resolv.conf` on a read only filesystem

I currently have a busybox based embedded linux system. The filesystem is a readonly mounted jffs2 filesystem. One problem I've run into is that /etc/resolv.conf can't be updated by DHCP. Is it ...