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

learn more… | top users | synonyms (2)

1
vote
1answer
35 views

Filesystem: How to find block of file represented by inode? [on hold]

I am writing a file system for my operating system and am doing research on existing file systems before I start designing my own. I came across some slides about the System Five File System and am ...
1
vote
1answer
12 views

Using chroot to restore Kubuntu 14.04

I have accidentaly purged some system files and now Kubuntu 14.04 won't boot past the start up logo. I read online that I can perform changes on my system through my LiveUSB and the BASH chroot ...
1
vote
0answers
19 views

what's the best filesystem for small files on mdadm RAID10? [on hold]

I need to setup a RAID on my Linux server and I am looking for advise about which filesystem I shall use. These are the type of files I am going to be writing/storing into my system. File size ...
3
votes
0answers
35 views

Most efficient way to thin out a backup which uses hardlinks

I have a backup disk which contains hundreds of backups of the same machine from different dates. The backup was made with rsync and hardlinks, i.e. if a file doesn't change the backup script just ...
-1
votes
1answer
25 views

RHEL 6 filesystem

I'm reading about RHEL 6 and getting confused about a knowledge check. It tells me that not to use a computer to give an answer for this but the question is on a RHEL 6 system, mount /dev/sda12 ...
2
votes
1answer
22 views

Windows safe characters from Linux

I've been copying large amounts of files from a Linux backup to a NTFS partition. The purpose is to have all files accessible from Windows. From this experience I've learned the following. NTFS ...
1
vote
2answers
58 views

How to move from one filesystem to another without changing directory structure?

/dev/xvda1 is full so I want to move its contents onto my 30GB udev filesystem. Filesystem Size Used Avail Use% Mounted on udev 30G 4.0K 30G 1% /dev tmpfs 5.9G 768K ...
1
vote
2answers
24 views

Mount(8) with mount(2)

I have a software that will unmount a partition programatically (if it's not busy) and mount it again after all of the work is done. If I run this in the terminal: sudo mount /dev/sdb1 /mnt/fat32 -o ...
0
votes
0answers
13 views

Some doubts about disk inconsistency

I have a system with 3 elements: An embedded system with this FAT lib that makes several operations in the FAT filesystem (e.g. add/remove file/dir, append to file). The sector read/write functions ...
0
votes
0answers
36 views

Input/Output error on every command! [closed]

When I SSHd into my server this morning every command I ran returned: /usr/bin/...: Input/output error Until I did a hard manual reboot of my server and now everything is working fine. But I am ...
1
vote
0answers
33 views

after running chown -R on home system is in read-only-mode [closed]

Unfortunately I run the following command: sudo chown -R m:m /home/m whereas m is my username. The intention was to fix some right issues for another problem, however it caused the whole system ...
1
vote
0answers
40 views

FUSE Overlay filesystem for “too long filenames”

Is there FUSE overlay filesystem, that: * resolve on it's own "too long filenames" for underlying filesystem * otherwise (for filenames fitting into limits of underlying filesystem) just proxy 1:1 ? ...
0
votes
0answers
42 views

What is a “file header” in Linux file systems?

The following sentence appears in an article in the web: All cryptographic metadata is stored in the headers of files, so encrypted data can be easily moved, stored for backup and recovered. ...
1
vote
0answers
17 views

How do I open access (+x) to a directory behind symlinks in one move?

For example, to open access to /sys/bus/usb/devices/1-1/, the following need to be done: chmod a+x /sys/bus/ chmod a+x /sys/bus/usb/ chmod a+x /sys/bus/usb/devices/ # files in "devices" are ...
3
votes
1answer
27 views

mount: Unrecognised segment type thin

So my Fedora Linux machine crashed during an update, and now refuses to start properly. I'm using SystemRescueCD to try to recover the contents of the hard drive. Following the steps in this post, I ...
2
votes
2answers
28 views

Embedded device, log partition, what file system is more resilient and uses less reads/writes?

I have an embedded Linux device with a read-only file system. I have another partition that is used to store an archive of logs. This partition will be written to a lot. What linux partition should I ...
1
vote
0answers
26 views

Union mount on Linux

A union mount presents a combined view of multiple directories (branches) in a single hierarchy. Ok, but how do I use one in practice, and which one? Many union mount technologies are available on a ...
0
votes
2answers
29 views

Man directory layout — why the subdirectories?

Man expects the man directories listed in $MANPATH or $(manpath) to be split by section into directories named "man$section". This duplicates the section information that is already available in the ...
6
votes
1answer
58 views

Is there filesystem that allows me to insert some block in the middle of file in O(1)?

Assuming we have huge file F. we like to put "around" seek s a new empty (filled with zeros) block in O(1) time (i.e. without rewriting all remining part) "around" means we can round s to nearest ...
0
votes
2answers
24 views

How does ext4 decide number of blocks of a file?

I'm playing with stat command which basically shows the inode information. Though I'm showing the information of a small file (146 characters), it shows 8 blocks. I was wondering why is that? Since ...
1
vote
1answer
26 views

Is it reasonable to use a journaling FS on a filesystem image that is stored on a filsystem that already provides journaling?

I need a filesystem image to put 150k files there, so they should be easily relocatable, i.e. mounted as a folder, when in use, unmounted and copied somewhere when needed. Due to the large number of ...
0
votes
2answers
18 views

Transmission keeps seeding after downloaded file has been deleted

I'm using Transmission 2.82 on Xubuntu 14.04, and I noticed that after I deleted the downloaded file permanently from files manager, the job in Transmission was still active and kept seeding, and ...
0
votes
0answers
16 views

Resize system partition

I would like to re-size xvda1 to 300G. I am using aws ec2 with Ubuntu 14.04. NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvda 202:0 0 300G 0 disk `-xvda1 202:1 0 8G 0 part / xvdb ...
0
votes
1answer
37 views

Incorrect used/free space

I've encountered this issue. I have a VM with Debian 8 on it. I gave that disk 350gb, /dev/sda1 is 344gb, used is 330gb and it's 100%. Situation is as follows, I'm importing huge mysql dump (300gb in ...
1
vote
1answer
19 views

What are the pros and cons of badblock's two non-destructive tests?

I use badblocks to test my 32GB class-10 microSD card that I use to boot my RPi. I already have a functioning file system on it, so I don't want to scan it with the -w option (destructive read-write ...
0
votes
3answers
33 views

Why is /dev a subdirectory of / (the root)? [closed]

Why is /dev a subdirectory of / (the root)? I ask because isn't everything in the file system also mounted from the computer's hard disk which show up in /dev? Then why isn't dev the root directory ...
1
vote
0answers
24 views

Is there a way to mount two folders into one mounting point, so that folders are mirrored?

I want some tool like $ mirroring_mount ~/first_location ~/second_location ~/mount_point So, when I edit file in ~/mount_point, it is edited in both locations, and if ~/first_location and ...
3
votes
1answer
19 views

White-list certain binaries and scripts inside a noexec/nosuid mount?

Just like the question. Is it possible to white-list certain executables from a noexec mounted FS? for instance, mine looks like this: /dev/vg/lv on /tmp type ext4 (rw,noexec,nosuid)
3
votes
1answer
32 views

File execution is denied

I just can't execute any file. For example: And I use zsh now,bash has the same problem.
0
votes
2answers
43 views

How to see information inside inode data structure

I can do an ls -li to see a file's inode number, but how can I list information inside a particular inode by using that inode number.
5
votes
3answers
74 views

How filesystem atomically writes a block to disk?

Block is an abstraction provided by filesystem, block size is integer multiples of disk sector size. Suppose a filesystem uses 4K as its block size, and the disk sector size is 512B, when the ...
1
vote
0answers
24 views

Determine affected file given logical block number [duplicate]

Given the logical block number from these log lines in /var/log/messages, is there a way to determine what file was affected? ...Buffer I/O error on device sdd1, logical block 203953715 ...lost page ...
0
votes
1answer
28 views

How can I share an internal disk via NFS? (What am I doing wrong?)

I have an NFS server (machine A) that mounts a 4TB internal hard drive at /data/Storage, and exports /data to client (Machine B). If I put a regular file in MachineA:/data, you can see it in ...
37
votes
3answers
5k views

Is an ISO image file a filesystem in its own right?

I am trying to understand what the relationship a xxx.iso file has to the other aspects of a block device, e.g. partitions and a file system. It's common for people to describe accessing or making a ...
-3
votes
1answer
26 views

How does ext[n] delete files?

I know that a lot of deleted files can theoretically be recovered, which suggests that "deleting" doesn't actually remove the information. So how do the various extN (e.g. ext4) filesystems delete ...
1
vote
0answers
15 views

Partition on raid array incorrectly states it is full

Sorry if this is the wrong place to post this question. I have a small home media (samba) server, which has a software (mdadm) raid10 array, with 4 disks, each being 3TB. It has only one xfs ...
4
votes
1answer
46 views

File permissions on Linux?

I am surprised that /mnt, /media or even /opt are not writable by myself on my own system (Linux-Ubuntu). Should I always use sudo for any action on these paths? Or would it be better to add myself ...
3
votes
3answers
42 views

Is CentOS using synchronous or asynchronous write

Is CentOS using synchronous or asynchronous write? Is ther any way to check or to change this?
0
votes
0answers
15 views

Is it possible to format a disk within an iPXE script?

I can mount a disk in the script, but it has to be formatted. I can't seem to find a way to format a disk within an iPXE script. Is it possible? How? Thanks
0
votes
0answers
21 views

Performance of FS directory structures

Given a large (hundreds of thousands objects) fs-based database of uniquely identified objects with potentially a large number of long prefixes with many objects sharing the same prefix are treeish ...
4
votes
1answer
91 views

What is using trillions of inodes on my almost empty server? [closed]

I have 18446744069923968593 inodes (which seem really too much) and much more problematic: I have 18446744069414835186 used so the system won't create any other file (even if the disk is almost ...
3
votes
1answer
27 views

How does Linux manage “simultaneous” writes to swap/disk partitions in virtual memory?

I'm currently working on an educational operating system called Pintos. While implementing virtual memory, one of the issues that I'm having is writing data to swap in a page fault that happened while ...
0
votes
0answers
18 views

Unable to create a filesystem on /dev/sda2 on a virtual machine , device showing busy, Kernel can't read partition table

This question has been asked several times on this platform, but none of the solution resolves my issue. Linux OS: RHEL 6.5 I created a partition /dev/sda2. # fdisk -l Device Boot Start ...
2
votes
1answer
46 views

Is it safe to mount same ext4 filesystem at different mount points?

I know there is option "--bind" for multiple mount operation to handle such case. But ext4 can be directly mounted at different mount points, without option "--bind". So, I wonder whether it is safe ...
0
votes
1answer
73 views

Need permission for Windows client to access linux NFS [closed]

I have a linux NFS the /etc/exports is like below: /opt/nfs 10.8.0.0/20(no_root_squash, rw, sync) I can r/w files from other linux machines. However, I only have read permission on Windows client. ...
2
votes
2answers
58 views

Why does df show negative available space?

Filesystem Size Used Avail Capacity Mounted on /dev/ada0p2 1G 624M 302M 67% / devfs 1.0k 1.0k 0B 100% /dev /dev/ada0p4 503M 20k 463M 0% ...
0
votes
1answer
43 views

lvreduce : “No directory, logging in with HOME=/”

I wanted to reduce my home LVM size so I executed the following commands : sudo umount -fl /dev/ubuntu-vg/home lvreduce --size -4G /dev/ubuntu-vg/home As the last command didn't work (apparently ...
0
votes
0answers
17 views

How do I check what mode my filesystem is in?

According to this answer regarding the shred command, the efficacy of the command depends on the mode the filesystem is in (e.g., journaled, ordered, writeback). How can I check what mode my Linux ...
0
votes
1answer
64 views

Struggling to remove a faulted ZFS pool on Centos 7 using zpool

I have been doing lots of testing of ZFS recently on a new server. I'm ready to move this server into production now, but I'm wondering if I can get rid of my old 'faulted' diskpools before I do, ...
1
vote
1answer
40 views

Fast filesystem for virtual backup environments

I know filesystem supporters war is behind the corner and there are plenty of fine tuning guide for each filesystem in the wild, so please stick to the specifications: I'm asking what would you ...