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ext4 (fourth extended filesystem) is a journalling file system for Linux, developed as the successor to ext3. Use this tag for question that are ext4 specific, generic file system related questions should use tag [filesystem]

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On this filesystem, there are enough inodes already, I only need more filesystem size: # df -i Filesystem Inodes IUsed IFree IUse% Mounted on /dev/mapper/spinning-backup ...
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How to dump the lost+found content from an ext4 img file that cannot be mounted using debugfs in linux and keep the folder hierarchy? My ext4 disk was failing. I made a disk image. I tried e2fsck and ...
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I'm new to Linux, yet am now committing to Linux, probably formatting HDDs to run the ext4 file-system, for (almost) all work. I need to keep one Windows machine running an NTFS file-system for a few ...
Right Angle Media's user avatar
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I have a docker container with a bind to a the local fs. ../htdocs:/var/www/html The docker container creates folders and files in /var/www/html with apparent userid 33 and groupid 33. Both do not ...
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O_DIRECT allows writes on a file to proceed with i_rwsem in read mode. Let's say I have allocated 100 fs blocks(4K) for a file with posix_fallocate(). This now becomes an unwritten extent for the file....
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Based on this question: How to erase/wipe all ext4 metadata, not just the filesystem signature 53 ef? My SSD is under warranty and I shall hand it over today, so excuse me for the hurry now. It ...
Vlastimil Burián's user avatar
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I’m running a Proxmox VM with a qcow2 disk (Ubuntu guest, ext4 filesystem). I tried to recover a recently deleted file using extundelete and ext4magic, but both tools failed to find the file, even ...
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My disk is partitioned like this: # fdisk -l /dev/nvme0n1 Device Start End Sectors Size Type /dev/nvme0n1p1 2048 411647 409600 200M EFI System /dev/nvme0n1p2 ...
Rodion Iskhakov's user avatar
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I have an old 16GB SD card that started giving I/O errors, known it's gone bad, I dumped all the content to an image file to see what I could restore, and the Disk manager alerted me that 16.1MB were ...
Mauro F.'s user avatar
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I only recently "discovered" the inline_data feature of ext4, although it seems to have been around for 10+ years. I ran a few statistics on various of my systems (desktop/notebook + server),...
Mike's user avatar
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I'm trying to understand how ext4 does some things. I have a small ext4 partition with block size 1024 (not the default 4096). I create a directory there and delete lost+found, just to get it out of ...
rd2's user avatar
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General overview I try to install the Mobian OS on my Pinephone thought the dd’s method as described in the official Debian documentation. Basically, I have to make a dd from an image to a partition ...
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On our RHEL 7.9 systems, we have noticed some strange behavior. Each machine has 4 disks, each with an 8TB capacity, but we are only using about 1.9TB on a partition. What doesn’t make sense is that ...
yael's user avatar
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I have a backup that was copied from Linux (ext4) to an exFAT filesystem. File and directory names that end with a period are inaccessible. I can (partly) list them, but ls behaves strangely. It ...
MRule's user avatar
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I am working on a ext4 file-system tool that aims to delete files such that they are not recoverable later on. My goal is to clear the inode metadata of a deleted file, but despite my efforts, the ...
Dhruv's user avatar
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My problem is to decode the output of the command file -s /dev/sdX on my system (where /dev/sdX is the device file associated to a USB key). Below I'll show the output of the command file -s /dev/sdX ...
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Ubuntu MATE 24.04 LTS System monitor in panel shows something like all day long. Hovering the mouse over the image shows disk usage hitting 83.3% at those peaks. When I run sudo iotop, an item that ...
AlanQ's user avatar
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I'm trying to update the recovery image from sdcard to recovery partition using Uboot command below update recovery mmc 1 fat recovery.ext2 Update is successful when the image size is 479MB and fails ...
Balaji's user avatar
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Inode usage go from 1 to 100% on a single file creation in a raid array on Debian. First, clean boot, then: sudo cryptsetup luksOpen /dev/RaidVG/LVMVol CVol sudo mount /dev/mapper/CVol /mnt/raid/ ...
Alicya Ambre's user avatar
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I've experienced total system freeze while checking if files where copied correctly by diff -rq [INTERNAL HDD] [USB HDD] This happened twice, always while running the diff. On the second occasion I ...
Marek Schwarz's user avatar
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I have an image-file of an ext4 file system (filesystem.img). I am extracting sections sections of the filsystem. Is there a way to manually calculate the the checksum of the sections just with a ...
user722585's user avatar
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I had a dual-boot setup on my laptop, with the Windows partition first, then Linux. I decided to delete Windows, so I removed its partition and expanded the Linux partition into its space using ...
kj7rrv's user avatar
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GDT = Group Descriptor Table ; GD = Group Descriptor. I'm trying to figure out how many bytes I need to read after the superblock to extract the entire GDT, because it's needed for a program I'm ...
james's user avatar
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Steps to reproduce: Use a single USB HDD with LUKSv2 and formatted with ext4 defaults (except 10 reserved blocks only, not 5%); Use Ubuntu or Debian with Gnome which allows to unlock the HDD; Trying ...
us3r's user avatar
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As a user with non root privileges, when copy/moving a bounch of folders and files, in one batch, from some device into another different partition which is ext4 and too small (space allocated to user)...
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I have a debian host configured as a NAS using 6 disks in a RAID 5 setup. The current configuration is as follows: # mdadm -D /dev/md0 /dev/md0: Version : 1.2 Creation Time : Fri Mar ...
Frederik Hoeft's user avatar
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While creating an install USB disk, I made the trivial error of indicating the wrong device, and ended up overwriting the initial few hundred megabytes of a 230 GB disk. The data was not extremely ...
Pietro Battiston's user avatar
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I am trying to synchronise a directory from a local ext4 filesystem to three FreeBSD ufs filesystems using rsync. Here is my setup: Local machine running GNU/Linux, ext4 filesystem mounted at /mnt ...
Giorgio's user avatar
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I needed to compress/archive a folder, so I ran the following command: gzip -v --rsyncable --fast -r myFolder/ -c > myFolderArchive.gz ...foolishly thinking this was going to do just what I ...
Undo's user avatar
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While working on a Seafile server migration, I noticed my rsync of the data took quite a bit longer than I calculated it should. I ended up noticing that some of the directories were already bigger on ...
kRYOoX's user avatar
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It's possible to restore original file timestamps during extraction on linux? I'm tested .zip extraction using 7z, unzip, unar, but only modification date is restored. Environment: Linux Mint 22 ...
osb's user avatar
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I tried copying some browser cache files to a separate disk and although the free space was enough the disk run out of space because each small file used took up the minimum disk allocation space. Is ...
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I have an external HDD drive formatted as Ext4 connected to my Raspberry Pi server. The server has been crashing lately and as a consequence the HDD is corrupt. When I plug to my computer and run sudo ...
hahv56's user avatar
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I was surprised to run out of inodes on a filesystem that was formatted relatively recently. When I compared it to another filesystem that was formatted on an older version of Debian (unfortunately I ...
plugwash's user avatar
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I'm planning on using the Ext4 file encryption ability. Everything works fine, but there is one problem left. After removing the PASSWORD via keyctl, i still can see the content of the encrypted ...
WGRM's user avatar
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I have an embedded device which appends data to an ext4 file in data = ordered mode until its power is cut off. To my surprise, I've noticed that this occasionally results in zeros being appended to ...
gTcV's user avatar
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I created a filesystem following this guide: https://wiki.archlinux.org/title/Ext4#Create_a_new_ext4_filesystem However it looks like I made a mistake because the ratio for /dev/sdc doesn't add up: ...
Atomic Tripod's user avatar
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Edit: I've posted an answer to the following below, but not accepted yet, in the hopes that someone will kindly provide me with a generic calculation for determining whether block group n will have a ...
genericuser99's user avatar
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2 votes
2 answers
582 views

So, I'm trying to understand FileSystem feature flags a little bit better. For what I could find, according to man ext4 a single directory in a ext4 FS can host up to 64,998 subdirectories. Normally, ...
S_Luis's user avatar
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My home directory lives on an EXT4 partition. A while back, accessing this partition started to be delayed (disk sleep) to the point now where it has become painful It would appear to have something ...
leoplaw's user avatar
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2 votes
1 answer
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I have my system to fsck all fs at all reboots. And forced fsck just now. Yet I still get: $ sudo fsck -vn /dev/lvmroot/root fsck from util-linux 2.40.2 e2fsck 1.47.1 (20-May-2024) Warning! /dev/...
gcb's user avatar
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I accidentally ran sudo rm -r on my RAID 1 mount point. I immediately realized my error, panicked, and hit CTRL+C to cancel. Some damage was already done. The lost+found directory and some of my data ...
KnuppenSasper's user avatar
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6 votes
2 answers
2k views

I am attempting to store some large files and I thought an encrypted ext4 partition would be excellent. However the GNOME Disk Utility appears to state ext4 as for internal disks and xfs only for ...
Kitty Cat's user avatar
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I accidentally used mkswap on a unmounted 2 TB data partition of a hard drive (not an SSD), while I was on a live USB session. I did not run swapon as I immediately realized what I had just done. I ...
Samuel's user avatar
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This is an microsd ext4 card on a rooted Android, where I want to use busybox chattr -R +u /mypath I know what +u means but does anyone have an idea about how the undo option is implemented for ext4 ...
user1874594's user avatar
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6 votes
1 answer
803 views

I have a CIFS network mount (ext4 on Synology NAS share), and I can't work out why I can't make hard links on that volume – the command is successful and results in a new file, but the new file has ...
6twenty's user avatar
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OS is Debian. I have a few systems that seem to not be freeing disk space correctly. On a normal system: du --max-depth 1 / --exclude=/proc -h -x Seems to almost exactly agree with: df -h / ie, ~800 ...
cat pants's user avatar
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I'm looking at parsing raw EXT4-formatted block devices, just using Python, primarily as a learning exercise, but am having trouble manually generating the expected Group Descriptor checksums - there ...
genericuser99's user avatar
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-1 votes
3 answers
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I have a RHEL 7 ext4 type filesystem and because of the lack of funding and no backups available I am trying to see if I can import ext4 filesystem from RHEL 7 into RHEL 8. I have a RHEL 7 with 2 ...
user2037551's user avatar
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1 vote
2 answers
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I have a computer at home that I use as a file server, using Nextcloud. Every computer at home is Ubuntu/etx4. I've had multiple outages recently in the neighborhood, and I think the sudden shutdowns ...
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