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

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How much space does an Inode occupy?

In Windows, when a file/folder is created, it is associated with an FRN (a unique number which is like an Index into the MFT). All the file metadata is stored in the MFT which occupies a reserved size ...
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2answers
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How can I increase the number of inodes in an ext4 filesystem?

I had a problem (new to me) last week. I have a ext4 (Fedora 15) filesystem. The application that runs on the server suddenly stopped. I couldn't find the problem at first look. df showed 50% ...
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19 views

Returning last-written file, containing particular sub-string in file name?

Whilst monitoring logging I have to go to my log files, order by written date, so I can then see the name of the log file for the most-recent execution of my application. Is there any way, given a ...
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11 views

BTRFS - removing drive by devid instead of path

I recently lost a 5 TB drive using btrfs. I had a system freeze (unsure why) while a balance was running. My SMR drive got corrupted. I was able to mount my array degraded and balance my data. ...
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33 views

Unknown filesystem type 'LVM2_member' [on hold]

I use to have 2 x 500GB drives merged using LVM as one drive. One of the drives is managed and removed from the server and the LVM is corrupted I tried to mount the second HDD but it's not working ...
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483 views

`ls` error when directory is deleted

I have two shells open. The first is in directory A. In the second, I remove directory A, and then recreate it. When I go back to the first shell, and type ls, the output is: ls: cannot open ...
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16 views

Where am I supposed to put PyCharm files?

I've just downloaded PyCharm (pro) for Linux (I'm running Ubuntu). It's basically a zipped directory containing everything it needs to run (tree below), including an entry point (bin/pycharm.sh). ...
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31 views

ls - why is parent directory smaller than its contents? How to see the size of directory's contents? [duplicate]

So... ls -l --block-size=MB tells me that directory is one MB ls -l --block-size=MB directory tells me there's a 3MB file inside the directory. Shouldn't that make the directory at least 3MB? ...
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438 views

DD and Free Space

I have a partition (/dev/sda1) of 10 GB. Also have "dd" file of another 7 GB partition ( /dev/sdb1). When I execute the command as: dd if=sdb1.dd of=/dev/sda1 then everything goes fine but I ...
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Mount LVM volume as external usb drive? CentOS 6

I'm trying to mount my old 2x500GB drives to the new server which has the same drive volume. Both have LVM structure but it's not working. root@server [/mnt/usb]# ls /dev/sd* /dev/sda /dev/sda2 ...
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27 views

do I need fsck.ext4 before mounting a filesystem?

I have a script that mounts /dev/sdc1 to /home. I do not know the state of /dev/sdc1 in advance, it could possibly be "dirty". Do I need to run fsck.ext4 before mounting the filesystem, or has mount ...
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1answer
15 views

Help about CentOS 7 apps & Driver [closed]

I'm using pc for several years but never tried Linux so I'm quite noob in this field. I'm using Autodesk maya, Nuke & will learn houdini very soon. I found that linux works faster for this apps so ...
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directory structure vs file system

I wonder what is the difference between directory structure and file system? Unix/Linux directories and file system looks as follows: /home/abc/xyzdir1 --is a directory /home/abc/xyzdir2 -- is a ...
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0answers
19 views

'Docker' File System - Compatibility with Symbolic Links

The question is marked in bold if you wish to skip the explanation of our situation. I work as a developer for a server network. We deploy multiple instances of our servers. we have 5 types of server ...
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3answers
1k views

Why is proc called a file system?

The proc file system allows the kernel to communicate information about each running process on a Linux system. Why is proc called a file system? It’s not a real file system like ext4. It’s just a ...
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2answers
985 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 ...
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440 views

Why are these files in an ext4 volume fragmented?

I have a 900GB ext4 partition on a (magnetic) hard drive that has no defects and no bad sectors. The partition is completely empty except for an empty lost+found directory. The partition was formatted ...
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1answer
4k views

Mounting a multi-partition (GPT/HFS+) USB 2.0 harddrive on Debian

I have a 3TB USB 2.0 hard-drive which has two HFS+ (Mac) partitions using GUID partition table for the partition records. It was partitioned with Mac OS Disk Utility. How can I mount these partitions ...
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1answer
23 views

NTFS-3G: All files are an “unsupported reparse point”

I just connected my NTFS HDD to my homeserver and I have an odd problem. EVERY file on the HDD is displayed as an "unsupported reparse point" in ls -lsa I tried mounting with different permissions ...
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1answer
177 views

How to automatically set permission at automount without mask

I store my data on a NTFS parition to share it with my Windows. I use the dmask,fmask option in my fstab entry to avoid rwx default permissions to everyone, for coherence, security, and also because ...
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17 views

fsync on newly created folder? [migrated]

Can anyone explain why fsync can return EINVAL when I pass folder descriptor in it? There is my code, it is pretty simple: #include <dirent.h> /* Defines DT_* constants */ #include ...
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Modifying the EXT2 Filesystem [migrated]

For a project I'm working on, I need to be able to modify the EXT2 filesystem. I have done extensive research, but as this is not a commonly required task, there seems to be very little helpful ...
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1answer
2k views

/etc/fstab is mounting rw filesystem as read-only

A partition of my internal hard drive (not the root partition) I want to mount automatically on boot. I've been using /etc/fstab to mount my external backup drive automatically read-only, so this is ...
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2answers
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ext4 file system tuning for storage partition

I searched the Internet, but I was not able to find a satisfying answer to my problem. The Problem I'm encountering currently is, that I'm transitioning my data from a NTFS Partition to a ext4 ...
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Why does '/' have the inode 2?

On many *nix systems like OS X and Ubuntu, We can see the inode of root directory is 2. Then what is the inode 1 used for?
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58 views

“ls -l” shows some abnormal files with “?”

Recently I ran into a problem with FTP server access. The server system logs shows that /etc/wu-ftpd/ftpaccess file is missing, as below: wu-ftpd[15695]: cannot open access file ...
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517 views

How does Unix implement file permissions?

I have a text file named foo.txt with root permission in one Linux distribution. I copied it to another Linux distribution on another computer. Would file permissions be still maintained for ...
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0answers
17 views

Mapping a physical sector to a filename

I just finished using ddrescue to recover the contents of a failing hard drive. It was able to recover everything but two sectors. How do I figure out which files (if any) occupied those sectors? ...
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2answers
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How many inodes do I need to access to read a file?

Imagine I want to access the blocks of file /hello/file. How many inodes should I walt through? I guess two, since I should not go through the root inode, right?
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1answer
135 views

“mount: wrong fs type..” error when mounting USB

I'm stuck trying to mount a USB drive on a Raspberry Pi (Wheezy). I've reformatted it (ext4) and tried re-mounting it in /media/owncloud (following sudo chown -R pi:pi /media/owncloud), but hit an ...
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4answers
627 views

filesystem for archiving

I have some complex read-only data in my file system. It contains thousands of snapshots of certain revisions of a svn repository, and the output of regression tests. Identical files between snapshots ...
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1answer
417 views

referring to files inside a jar or zip files in Linux

I am wondering if I can refer to files inside JAR or ZIP files using URLs. I mean, without using a tool (such as the Java Jar utility) but just at the operative system level. For example, if I have a ...
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2answers
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What are the differences between split and rar?

I am used to raring files -- but I am looking for something faster. I see that there is a "split" command. How does this command compare to rar? What is are the differences between split and rar?
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224 views

Virtual write-only file system for storing files in archive

I have an embarrassingly parallel process that creates a huge amount of nearly (but not completely) identical files. Is there a way to archive the files "on the fly", so that the data does not consume ...
13
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2answers
786 views

Is that possible to integrate zip and tar.gz files as directory into the file system

I wonder if there is a way to integrate (it's a bit different from mounting, I think) compressed files as directories into the file system? E.g., one could download a compressed-file.tar.gz to his ...
2
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1answer
112 views

zfs deduplication “low” ratio

In Solaris 11, in a pool named mypool I activated deduplication with zfs set dedup=on mypool Then I created two 100 MB file: file1 and its copy file1copy. Only their names are different: their ...
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Should I put old projects in tarballs

I never really used tarballs/archived much, except for uploads (with compression). Now I've accumulated a huge list of software projects coding experiments -- basically directories with lots and lots ...
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3answers
533 views

Can the filesystem become inconsistent if interrupted when moving a file?

I have two folders on the same partition (EXT2) If I mv folder1/file folder2 and some interruption occur (e.g. power failure) could the file system ever end up being inconsistent? Isn't the mv ...
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Repeated Ext4-fs error with comm psad: invalid block. Does it mean the SSD is dying?

Configuration : Debian Jessie with SSD. /dev/sda1 is root filesystem, /dev/sda6 is home filesystem. Errors occurs only on /dev/sda1. For the third time, I've got software errors because the root ...
2
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1answer
118 views

Mount linux mount in windows (without ftp)?

I successfully mounted my external hard drive (ntfs) to /mnt/seagate. I'm using debian and the server is connected over LAN to my PC. So how can I mount my hard drive in my windows explorer without ...
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1answer
739 views

How do I mount a UFS disk in read-write mode?

I have a system drive that has filled up to the last sector, so that it doesn't boot anymore. The file system is UFS (it's an old Freenas 0.7 installation), but since UFS write support doesn't appear ...
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how to remove root clone folder

I am not entirely sure what i have done to be honest, but i believe i have mounted a folder to a / directory. So no when i am in / folder i have : bin etc lib media proc ...
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Filesytem errors during boot

I am using OMAPL138 and kernel version 2.6.37 and I would like to improve the boot time of my system. I made some progress on this, but I still have some errors which may be causing delay in the boot ...
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1answer
27 views

How do file permissions work with partition filesystem?

If I store a file in ext2, ext3, or ext4 formatted partition, it's permission is saved. I mean, I can have different permissions for different files in extX partition. However, If I store a file in ...
2
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1answer
131 views

rm -rf: cannot remove `/opt/jetty': Directory not empty

I have a script using the following command to remove a folder: ssh -q root@hostname sh -c 'rm -rf /opt/jetty/' Most of the times it works fine, but occasionally I get this message: rm: cannot ...
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Precaching the list of files of the filesystem

I was wondering where and in what form a list of files and directories is stored on the ext4 filesystem. The problem is that whenever I try to access a certain directory for the first time since boot ...
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2answers
4k views

Give read-only access to specific folders?

I would like to give read-only access to a user but I want him/her to see only the exact folders I give access. for example he/she shouldn't travel around all the server and browse to all users ...
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Not detecting hfs+ partition on second drive

I'm having a problem, I want to backup some files to my second drive before reinstalling, but I can't mount it. The filesystem is contained in /dev/sdb10, according to GParted, but that doesn't exist ...
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1answer
39 views

How can I (easily) map a block device node to the directory it's mounted on?

I need to find (in C or C++) the used space on a filesystem (Linux) when being provided only with the disk block device name and the partition number. For most filesystems I can go: Craft a dev ...
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1answer
26 views

Backup Files on ext4 to external NTFS drive

Would there be any problems in copying files on my Linux system with ext4 filesystem to an external drive that is formatted in NTFS? I'm reinstalling my OS and intend to copy these files back to my ...