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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How does my partition (ext4) know its size of used/free space?

I ran df, and the output appears almost instantly: (FS Size Used Avail Use%) /dev/sda1 145G 8.4G 130G 7% sda1 is an ext4 partition. Without summing the size of all files, how can ...
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Disk problems prevent me from booting, or set the disk to read-only. How do I fix the disk?

Problem: Since about one week ago, my Ubuntu system encounters various severe and strange problems. Sometimes the whole system suddenly freezes. I have to push the power button to shut down the ...
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not able to add files to HDD

I created a single primary partition to my WD WD800BB-55JHA0 80GB HDD using MBR partitioning scheme. Into this partition I created an ext4 file-system with 200048640 inodes! Then I created loads of ...
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Filesystem suddenly read-only?

I've been storing some files on a MicroSD formatted to ext4 that I connect via USB. I tried to move a directory in it to an external hard drive, and I got mv: error reading ...
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Does Debian use GB or GiB for it's partition manager during installation?

I'd like to create a 5GB (1000) as one partition during the install of Debian. However, I'm not sure if if the partition manager uses Gib or GB. The version of Debian to be installed is 8.4 using the ...
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Recover lost ntfs partition?

I made a live USB of ubuntu to install it on my hp pavilion running win 10. Was planning to do dual boot, but accidentally reformatted my main ntfs partition into an ext4. Is there any way I can ...
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ext4 disk space not reclaimed after deleting files

I recently got a "device full" warning for a 2 Tb external ext4 drive. I deleted a bunch of files, about 90-100 Gb of old system backups, and since I did not want to empty all trash, I deleted the ...
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Is it possible to store data directly inside an inode on a Unix / Linux filesystem?

According to this Red Hat bug report (which I am trying to reproduce) it looks like the Netapp filer is able to store data directly in the inode, in case of very small files. Considering I had a FS ...
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Deleting an Impossible File

A picture is worth a thousand words, so I want to start with that: From the image you can see that I have a ~500GB hard drive. The filesystem is ext4. On this 500GB hard drive, I have a file that ...
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613 views

du and ls commands reporting wrong directory size

I'm used to the du command. I often use it with -h option. I report the result in a text file which I use to track space consumers. But I was wondered today to see a directory being reported as using ...
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69 views

What is this data that keeps reappearing after partition delete + new partition creation?

I deleted a big extended partition containing an ntfs logical partition with high percentage of occupied space and from that extended partition I made a new, smaller extended part. In it I ...
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493 views

Why does find -inum iterate through the whole filesystem tree?

It surprises me to see find iterate/walk through the complete filesystem when I do a simple find -inum 12345 Without background info it seems to me that there should be much easier ways for to tell ...
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577 views

Recovering truncated file

I'm in a peculiar situation. While editing a Perl program I accidentally truncated the file to zero length (using an Emacs lisp code I was developing). I need to recover that program... How do I that ...
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615 views

Linux EXT 4: How to list files that occupy a block group?

Linux EXT 4: How to list files that occupy a block group? I believe a file can span multiple block groups. Given a block group, how do i enumerate the paths of all files contained in it?
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Recovering files from partition (ext4)

a part of out homework assignment is to recover deleted files from the partition with the ext4 file system. I've tried using the extundelete tool, by following this tutorial. The tool recovered a lot ...
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What is a generic way of finding out whether the kernel has ext4 (or other) bugs?

From /. found this worrisome post by Theodore Ts'o. Turns out ext4 has some journalling problems. How can I quickly find out version numbers of susceptible kernels for this and other bugs?
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Keep ext4 journal on another system, how much space would be necessary?

I'm going to move journal to another partition, but I don't know how to correctly caculate the size needed for journal? I'm running ext4 file system with 15GB capacity.
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is it safe to backup ext4 partition with partimage , which is detected as a ext3 partition

I use partimage to backup my ext4 partition, but during backup, the partition was detected as an ext3 partition. So I'm wondering if this can cause something bad.
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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 ...
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How to mount HDD extracted from singledrive-ZyXEL NAS

Gparted Information and Warning: <i>Filesystem volume name: <none> Last mounted on: /i-data/f128dac5 Filesystem UUID: c2f55399-a8ab-400b-a144-d605ceb58c9d Filesystem ...
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29 views

Is it safe to reencrypt unencrypted mdadm array with LUKS?

I would like to convert my raid6 mdadm into encrypted LUKS. Right now raid6 consists of "/dev/sdX1" which are raid partitions. /dev/md0 doesn't have a partition - it is pure ext4 FS. Is it safe to ...
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Choosing File Format of /home between NTFS and Ext4, Understanding Trade Offs in Performance vs Data sharing with WinXP in Dual boot [closed]

I have Win Xp on first Primary Partition. I am leaving another 2 primaries for a future possible Win install. I am planning my Logical partitions to install a Linux Mint. I read that a separate ...
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Content Explanation Of: /proc/fs/ext4/device_name/mb_groups

I've been wondering, what are the explanation of the columns in the /proc/fs/ext4/device_name/mb_groups file. The columns are: #group: free frags first [ 2^0 2^1 2^2 2^3 2^4 2^5 2^6 2^7 2^8 2^9 2^10 ...
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144 views

Why can't I write to my ext4 partition even with 777 permessions?

When I touch a new file for example I get: touch: cannot touch 'file': permission denied It is a partition that is mounted in the /media directory on demand. I am the owner and I've had it's ...
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439 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 ...
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311 views

find the cause of file corruption when copying files to a network share on an Ubuntu machine

I am copying files from my SD card to my Ubuntu server via Windows 7 using a network drive. The problem is that sometimes, 2 files out of 150, are corrupted during transfer. See here 2 example files ...
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15 GB of unaccounted-for space in filesystem

[nathanb /mnt/work] sudo du -hs . 23G . [nathanb /mnt/work] df -h . Filesystem Size Used Avail Use% Mounted on /dev/sdb1 40G 38G 6.4M 100% /mnt/work Where is the other 15 GB? ...
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269 views

Write to ext4 filesystem hang while lazyinit in background

I am running SUSE 12 on a node that has 6TB disks attached with EXT4 filesystem initialized. Lazyinit in the background takes atleast 24 hrs to complete. Write performance to the disk is significantly ...
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476 views

Recovering from bad superblock on external drive

read a few similar questions/posts and tried the solutions, still stuck. My scenario is simple, external ext4 drive was powered off (via cat) while operating, and failed to mount on boot. As I dug ...
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Tiny directory on ext4 file system taking up 2024 blocks? [closed]

I have an ext4 file system on my work computer and I came across a directory that is taking up >1 mb of space. There are 7 entries in the directory. The directory hasn't ever contained more than 20 ...
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350 views

How to increase the size of Linux Partition (EXT4) without loosing data when the swap partition is exactly after it?

I have a problem and I appreciate if anyone can help me. 1: fdisk -l: Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors Units = ...
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259 views

archlinux check disks on boot

How can I check and mark bad blocks on Linux startup? There are a number of options available and most of them require accessing hardware and running live CD's. But I would like to avoid and perform ...
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harddisk not recognized / filesystem too large to mount safely on this system / hdparm shows garbage

I have a 4 TB Verbatim external hard disk with ext4. It can be successfully mounted at my Raspberry Pi. I am trying to plug it at my WD Mybook Live Duo device where I have SSH root access. When I ...
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Could I set flag “barrier=0” when using SSD?

I'm using ext4 filesystem in SSD,when mounting SSD,could I use flag "barrier=0"? I knew this flag is safe for BBU(battery backup unit),but is it safe for SSD?
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Why is it impossible to change the inode count of an ext filesystem?

I know that it isn't possible to change the inode count of an ext filesystem after its creation, but I haven't been able to find any explanation on why it isn't. Can anyone enlighten me?
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recovering /home folder from faulty drive

I was going to try ddrescue to recover data from a faulty (beeping) laptop drive and a primary ext4 partition. Reducing the number of reads from the disk should reduce the recovery time and increase ...
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791 views

Why is my ext4 filesystem recognizable only on the machine it was formatted on?

Xubuntu liveCD 11.04 running on "bad machine" with mdadm RAID1 array with an unrecognizable ext4 filesystem: To rescue some files, I installed a new hard drive and formatted it to ext4. I copied ...
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488 views

fsck ext4 on ssd: max mountcount and checkinterval

I'm using an ssd as the only drive in my laptop (Debian stable). It seems that SuSE sets mountcount to -1, disabling fsck at boot. The thread linked says that ext4 needn't be fsck'd anyway. Is that ...
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Restored VG has shifted volumes

I'm recovering a PV on a mdadm RAID 1 with a single VG containing several LVs. The underlying devices have several bad sectors (one just a few, the other really much) and a silly typo made it ...
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199 views

ext4 drive takes forever to ls?

I've had an external HDD formatted in ext4 for a while. For some reason, it's started to take forever to list directories. Sometimes just running ls /mount/point/of/drive takes minutes, sometimes that ...
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934 views

Ext4 exhibits unexpected write latency variance vs. ext2

I have a latency sensitive application running on an embedded system, and I'm seeing some discrepancy between writing to a ext4 partition and an ext2 partition on the same physical device. ...
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Ext4 corrupted and unrecoverable after LVM resizing + power failure

I have a completely standard, single hard drive Fedora 23 desktop. The dual-boot installer set up the Linux partition as LVM, with root, swap and home logical volumes; root and home were both ext4. ...
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How to move an ext4 journal

I have an ext4 filesystem on an USB stick and after using it for some time I would like to move the journal to some other blocks, so that the stick lives longer. The journal is described by inode 8, ...
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External USB drive fsck fails on boot

Yesterday I tried setting the fsck flag on fstab to 2 for the external USB HDD I use in my Raspberry Pi, so that it would be checked on boot, like: proc /proc ...
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ext4 & jbd2 dirty metadata

I have an embedded system based on the RiotBoard, I have the main file system on the MMC set as read-only, and an 8gb usb flash drive for writeable storage. rootfs is debian, linux kernel version ...
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Are the links between the inode and data blocks of a file removed when deleting the file?

Suppose there is only one hard link to a file. When rm the hard link, the inode and data blocks of the file will be marked as unused. But are the links from the inode to the data blocks of the file ...
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Why is OS constantly writing to disk (ext4) on a Ubuntu 14.04 machine? Is it normal?

I'm quite sure it didn't happen before I started using LUKS and LVM on my disk (2 or 3 weeks ago), but now root user is constantly (every 2-3 seconds) writing (not reading, just writing) on disk and I ...
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Untar a filesystem to device as normal user but maintaining the correct UID and GID

I'm doing quite a bit of development using Yocto to target an embedded system. As its final output, Yocto generates a tarball of the filesystem, which I then untar onto an ext4 partition of an SD ...
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Flash drive fat32 partition overwritten by Linux Mint 17.1 image writer - need to recover [closed]

Ah Yeah...Mint 17.2 image is written onto a Kingston flash drive (8GB) and overwritten a fat32 partition. I can take You to the moon if You tell Me that, those files aren't lost ones. ///the image ...
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Trying to mount ext4 partition from eMMC gives “Invalid Argument” error

I'm trying to set up a custom Linux installation on an Intel Atom (Baytrail) based Android tablet, using Qt 5.5 for device creation. The build system is based on the Yocto project and builds an ...