The ext4 or fourth extended filesystem is a journaling file system for Linux, developed as the successor to ext3.

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Linux Ext4 Filesystem Explanation Needed, 19 million One byte files equals 80+GB?

Here's the deal, I am dupe checking domains for my crawler, I have 145 million domains to dupe check on the fly. Storage Consumed: 80GB for 19 million files To do so, I am creating a directory ...
4
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1answer
5k views

resize2fs seems stuck at pass 3 (scanning inode table) - what to do?

I have a machine running Arch Linux (2010, I believe) with a 6TB RAID-5 array hooked up to a Highpoint RocketRaid 2320. I've been having issues with the RAID controller's drivers and the latest Linux ...
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1answer
6 views

Which namespaces of xattrs a non root user can set in android?

I know it isn’t possible to setsecurity.capabilitiesattributes without uid 0 or CAP_SETFCAP. However I was unable to find a complete list of what namespaces of names are allowed or what are those ...
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142
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8answers
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How to read ext4 partitions on Windows?

Is there a way to read ext4 partitions from Windows? If so, what can I do?
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122 views

Is there any way to access a Ext4 partition from Windows? [duplicate]

I dual boot my PC (Windows 8.1 and Ubuntu 14.04), is there any way I can access the Ext4 partition from Windows? I just need to read a couple of folders, nothing else.
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43 views

Does resizing an ext4 partition formats it?

I currently have my hard-disk divided in 3 ext4 partitions as shown in the image below. Now, recently I've been needing more space and I would like extend the sda2 by shrinking the sda1 and adding ...
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3answers
655 views

Cannot delete directory on Ubuntu 14.04.3 LTS

As you can see below the root user cannot remove myapp directory but can write and delete files in this directory. The filesystem is ext4. Is this a filesystem issue? Do you have any ideas on it? ...
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21 views

Will `tune2fs -E stride=X` have the same effect as `mkfs.ext4 -E stride=X`

The man tune2fs and man mkfs.ext4 state: stride=stride-size ... This mostly affects placement of filesystem metadata like bit‐maps at mke2fs(2) time to avoid placing them on a single ...
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69 views

abnormal behavior of the kernel jbd2 process

I want to understand the mechanism of the journal of the ext4 file system on partitions with no free space. When a process (apache-tomcat, in my case) keeps making small additions to debug log files, ...
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Moving 2TB (10 mil files + dirs), what's my bottleneck?

Background I ran out of space on /home/data and need to transfer /home/data/repo to /home/data2. /home/data/repo contains 1M dirs, each of which contain 11 dirs and 10 files. It totals 2TB. ...
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22 views

Use `extundelete` to Restore Single File

There is a file which I didn't delete but it went missing (see http://unix.stackexchange.com/questions/249894/files-just-go-missing-on-ext4-partition-within-truecrypt-volume). I don't know the full ...
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71 views

Manualy Clean Second Partition In Android Link2SD

I use Link2SD in my Android Phone to link some of my apps into external second partition. My external total size is 32GB and I partition it into 2 partition. First Partition is using FAT32, and the ...
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4answers
51 views

Will transfering a file between two different file systems incur generation loss?

I want to transfer few hundred GBs of .mkv files from my Linux ext4 file system to a NTFS formatted external hard drive and since I'm a multimedia major, I can't really afford to have any quality loss ...
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59 views

How far in the past extundelete can go?

Yesterday I've accidentally deleted files from ext4 partition. During this time some downloading was running. If the content cannot be recovered I would be glad just for file names which were deleted. ...
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1answer
37 views

What data on a filesystem are really affected by powerloss?

Let my filesystem be ext4 mounted with data=journal. I don't fully understand what happens during power loss with filesystem in this case. So I have the following questions: Under which ...
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3answers
120 views

Is file creation date visible and NTFS ADS metadata preserved on an EXT4 partition accessed via SMB?

I want to build a small backup server for my essential data. I'm interested in not losing any of the features that Windows/NTFS offers, like: File Creation Date ADS metadata(comments, tags, etc) ...
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101 views

How to intentionally corrupt an ext4 filesystem?

I want to intentionally corrupt a file on an ext4 filesystem for testing. Is there a way to corrupt it by, say, leaving a file open and then rebooting?
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672 views

Is it ok to limit writes on SSD/EXT4 by setting commit parameter in fstab?

I have installed an SSD on my / (Linux scv 3.8.0-34-generic #49~precise1-Ubuntu SMP Wed Nov 13 18:05:00 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux). If I leave the default settings in /etc/fstab I can ...
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28 views

best way to copy content of NTFS partition to ext4 partition

I have a 263 GiB NTFS partition (with no free space) and want to copy all its files to a ext4 partition, that can't be larger than 294 GiB. I also need to copy NTFS Junctions as some kind of link. ...
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49 views

ext4 for data partition in Windows

I have moved my Windows user profile to a separate partition in order to share it with my linux install. I have originally tried to make a NTFS formatted data partition, but this creates some issues ...
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2answers
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Creating ext4 partition from console

I have a volume /dev/sda1 (1.2 TB) containing an NTFS partition using 0.6 TB space. I want to make an ext4 partition in the remaining 0.6 TB space. I have not tried anything yet because I don't want ...
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1answer
31 views

Sanity check ext partition size?

I ran resize2fs on a ext4 linux partition and I want to create a partition after it. However I want to sanity check that the size I put into fdisk afterwards was correct. What's the best way to ...
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1answer
725 views

How to stop jbd2 to release a device

In an AWS EC2 instance, we have multiple EBS volumes. When I try to detach any of them, the umount command works, but the device can't be detached. # grep -c xvdj /proc/mounts 0 However, lsof ...
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95 views

“Bad magic number in super-block” with external HDD ext4 partition

I have a self-powered external HDD plugged through USB to my laptop. I deleted the single partition it had, intending to create a new encrypted partition. But I started getting an error once I ...
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40 views

Harddisks aren't recognized in new system (ubuntu 14)

I used to have a small home server with two attached USB disks, both formatted as ext4. Now I bought some new hardware, took the disks out of their USB case and installed them in the new server. In ...
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30 views

Best method to copy big partition contents with many hard links

We had a LVM of almost 16TB with ReiserFS. We now want to add more disks, but we cannot continue using ReiserFS, as it has a maximum capacity of 16TB. This volume is being used to make incremental ...
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270 views

Someone please explain how I'm writing to EXT4 from Windows 8.1

I'm dual booting Debian amd-64 Wheezy 7.5 and Windows 8.1 I have 6 drives and I am 100% positive that four of the drives are formatted Ext4 (Formatted in Linux) How on earth is it that when I'm in ...
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2answers
7k views

Multiple partitions for an external USB hard drive used by Linux and Windows

I want to split a large external USB hard drive into at least 2 partitions. I've heard that multiple partitions on a USB drive involves problems not associated with partitioning a regular IDE/SATA ...
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38 views

Sharing Folders over Network via EXT4 Dual Boot

This may be a complicated question, so I apologize in advance: Two computers on a home network: Tesla (dual boot linux Mint & Windows 10), Spitfire (Windows 10). Both have Kodi (XBMC). I want to ...
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69 views

Unable to get ext2fsd to start automatically

I dual-boot between Ubuntu and Windows 8.1, and I am currently using ext2fsd to access files on my Linux drive and my shared file drive when I am booted up on Windows. However, I cannot get ext2fsd ...
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682 views

Want to create an ext4 partition from windows 10

I want to create ext4 partition in my internal hard disk from windows 10. I have seen many questions but all of them mention to partition with external hard disk.I wanted partition in internal ...
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3k views

mkfs.ext4 errors

I've just installed Kali Linux and am working with an img file I created from dd (/dev/zero). When I go to do mkfs.ext4 on it, I get mkfs.ext4: Device size reported to be zero. Invalid partition ...
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Sync Microsoft OneDrive with a folder on EXT4 partition in dual boot scenario

I use Ubuntu and Windows 10 in dual boot scenario. As a student I received plenty of storage on Microsoft OneDrive and I would like to upload and sync my files. I primarily use Ubuntu and prefer to ...
0
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1answer
31 views

How to mount an ext4 filesystem with specific permissions?

I want to mount /home such that any user can read and write to his/her own directory but only a certain user has execute permission. We have a queue system (torque) and I want users not to be able to ...
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How to format to NTFS my EXT4 partition on Windows 8?

I'd like to format one of my partitions to NTFS which is EXT4 at the moment and an ubuntu is installed on, that I don't need anymore. I can't see the partition in My Computer and I've never tried ...
0
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191 views

Recovering data from two partitions, one NTFS, the other ext4

I have an external HD, and it had three partitions on it. One was a 4GB ext4 filesystem, and two others, 120GB NTFS and 120GB ext4. I created an image on the 4GB using the Linux utility dd on Fedora ...
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102 views

sfdisk geometry warning / how to repair

I have problem with superblock in an ext4 disk : usr@rpb ~ $ sudo fsck -v /dev/sda fsck from util-linux 2.20.1 e2fsck 1.42.5 (29-Jul-2012) ext2fs_open2: Numéro magique invalide dans le super-bloc ...
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Corrupted linux partition: EXT4-fs error loading journal

I have a Linux partition (Ubuntu 12.10 upgraded to 13.4) on a machine that originally came with Windows 7. Windows 7 was working unusually slow (still is, and was still running slow after ...
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129 views

Torrents downloaded with Deluge have started getting errors

Basically, while downloading (or more often after it's fully downloaded) deluge starts reporting an an error with the downloaded data. Status: file too short: reading p: 6690 b: 0 s: 262144 (read: ...
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1answer
121 views

partition being mounted as noexec, not fstab, what else can it be?

I have one partition being mounted as noexec. It shows on the mount output, but there is nothing on fstab to do that. Where is the noexec coming from? my fstab: ...
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1answer
181 views

Proper rsync flags for backuping from ext4 to ZFS

I have a home server running Ubuntu 14.04.3 LTS with an ext4 file system, to which I regularly backup data from various devices. Now I have set-up an external USB HDD with ZFS file system and would ...
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126 views

CentOS 7: Partition resizing issue where now there is a lost+found folder full of numbered folders and the data is gone

Set up Running a home server with a 2TB HDD. Running VMWare ESXi 5.5 that has 2 guest OS; CentOS 7 and Windows Server 2012 R2. There are 3 virtual disks (VMDK) thickly provisioned: 20GB CentOS 7 ...
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1answer
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Copying .exe files from ext4 to ntfs

maybe a silly question but.. why cant i copy an .exe file format from linux (ubuntu 14.04) to windows 8.1 without corrupts when i try to execute it? I can copy some others file formats like images ...
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29 views

Partition recovery

During a fresh installation, I accidentally formatted a disk containing datas. I tried using testdisk to recover the erased partition, but , it only detects the new one. With the deeper search mode, ...
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Infinitely deep folder without symlinks in ext4

It seems like I can find an infinite number of /pl/locale subfolders in this ext4 partition, yet none of them are symlinks. Where is the loop? $ ls -ld ...
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fedora 21 lets a user overwrite a file he does not have access to

I reproduced this problem on two fedora 21 machines. I would like that sqlite3 does not write the ~/.sqlite_history file. I couldn't find an option but said, no matter, I'll make it that it can't ...
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1answer
84 views

ext4 superblock checksum?

I'm reading the ext4 superblock, but its s_checksum (offset 0x3FC) is always zero. Also the s_checksum_type (offset 0x175) field is zero as well, however according to ...
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4k views

Is there any way to restore EXT4 partition

Is there any way to restore ext4 partition after formatting the entire hard disk then making two partitions of NTFS