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

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ETX4-fs error on startup

Hi everybody, today I run dmesg and at the bottom I found some error lines about the device mmcblk0p2. Everything works fine even with those errors but I'd like to understand the problem. I've ...
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Difference between fsarchiver and dump

What is the difference between dump and fsarchiver? Are there features in dump which are not covered by fsarchiver? Can both backup to tape storage for example?
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How to use the new Ext4 Inline Data feature ? (storing data directly in the inode)

If I read the Ext4 documentation correctly, starting from Linux 3.8 it should be possible to store data directly in the inode in the vase of a very small file. I was expecting such a file to have a ...
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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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Can't write on recently created EXT4 partition

On a new external hard drive (Intenso 05-1204-18A), I made (with GParted) two partitions : Disk /dev/sdc: 931.5 GiB, 1000204883968 bytes, 1953525164 sectors Units: sectors of 1 * 512 = 512 bytes ...
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writing to ext4, 8GB partition vs 512MB partition

I have a question which is slightly programming related, but it mostly relates to how ext4 works. I have a program which writes 128MB to a file with changing random aligned offsets. I write 256KB ...
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How can I partition a volume in a regular file without loop?

I'm trying to play around with OS development, and I started with a boot loader, where phase 0 loads phase 1 from a file (specified by inode) on an ext4 partition (specified by first LBA). Of course, ...
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Problems with file system

I created a partition with EXT4 file system and when I'm writing in this partition frequently the Kernel return the following error: Jan 01 01:17:54 infobuffer360 kernel: r7:c0561280 Jan 01 01:17:54 ...
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Accidentally ran mkfs.vfat on my backup drive [duplicate]

I ran mkfs.vfat /dev/sdb (whole device, not just one partition) on my backup drive, ironic, right. Is there any way to recover my files.
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Can I mount half an ext4 partition

I had a hardware raid array, a disk failed during migration and the controller flipped out and is unable to recover. I've written a small python script which has correctly mapped out the state of the ...
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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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Files copied from Win7 to Linux ext4 are empty/corrupted

Problem: User on Win7 machine. Copy a simple text file from Win7 local drive, through samba, to Linux ext4 dir. The content of copied file on ext4 dir is empty when user open it. Only 1 user has ...
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How to give Windows partions' file execute permission

I have installed Linux Mint 17 and Windows 8, as dual boot. 500GB hard disk has 5 partitions. Two of them are NTFS and the other 3 are ext4 partitions. When I log into Windows, I can not see any ...
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Can overwritten files be recovered?

I am not talking about recovering deleted files, but overwritten files. Namely by the following methods: # move mv new_file old_file # copy cp new_file old_file # edit vi existing_file > D > ...
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Short read while trying to open partition

On my personal home computer running Kubuntu Linux 13.04 I'm having trouble mounting a partition that is very dear to me. My backup policy is to perform a backup about monthly, so I do have a backup ...
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Birth is empty on ext4

I was just reading up on the Birth section of stat and it appears ext4 should support it, but even a file I just created leaves it empty. ~ % touch test ...
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Debian..Can't format and mount external HDD

I have been trying to format my 640GB external Hard Drive in command-line and can't seem to get it working. I have done the following in order: sudo fdisk /dev/sda (Deleted any partitions, created ...
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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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Understanding ext4/jbd2 transactions

I'm trying to debug a bit of trouble I'm having with I/O latency on a system using ext4, but I'm a bit stumped in that I don't understand its journalling as well as I'd like to. What I'm wondering in ...
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Drawbacks of increasing number of inodes in EXT4

I am currently using backintime to take "snapshots" of my file system. It is similar to rsnapshot in that it, makes hard links to unchanged files. I have recently run out of inodes on my EXT4 ...
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Smallest file block size (ext 3, 4)

I'm curious, what is the smallest size a file can really be on Linux? (Assuming Ext3 fs, so why not ext4 fs as well). Sure you can write a file that only contains one byte, or maybe even less; but ...
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extundelete does not finish its work

I need to restore a file on sda7 so I remounted ro und startet extundelete manuel@P5KC:~/recovery/RECOVERED_FILES$ sudo extundelete --restore-all /dev/sda7 WARNING: Extended attributes are not ...
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Red Hat Enterprise Linux 6.5 remounts root filesystem read-only after hibernating

I have a Lenovo ThinkPad T430 running Red Hat Enterprise Linux 6.5, kernel 2.6.32-431.30.1.el6.x86_64, and my filesystem structure consists of a master LUKS partition holding two logical volumes, one ...
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Which file system is better for Ceph?

I've read the Ceph OS recommendations document, but still I have a question. Which file system is better for Ceph? XFS, ext4, or something else?
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Fix EXT4-fs bad geometry (block count exceeds size of device)

I have a micro SD card which has a FAT32 partition and an EXT4 partition. The EXT4 partition will no longer mount. dmesg shows the following error: EXT4-fs (sdb2): bad geometry: block count ...
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Have I destroyed data on drive?

I stupidly ran the following command on an external ext4 USB disk, typing /dev/sdb instead of /dev/sda which was the new disk I was setting up: dd if=/dev/zero of=/dev/sda bs=512 count=100 These ...
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Why doesn't my exactly 100 MiB partition at 1 KiB block size have the corresponding available blocks/space?

I have a very high density virtualized environment with containers, so I'm trying to make each container really small. "Really small" means 87 MB on base Ubuntu 14.04 (Trusty Tahr) without ...
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Restoring data from NTFS formatted pre-ext4 partition

MS recovery just formatted my 1TB Backup disk to NTFS which was ext4 before. It was an MBR disk before but now it's a GPT one. Now I'm on SystemResqueCD and can check with the testdisk. What is the ...
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Recover Data from EXT2 (previously EXT4) partition [duplicate]

When trying to repair "group descriptors" on my EXT4 2TB drive, I have made a mistake. Instead of use this command: e2fsck -b block_number /dev/xxx (using the block number of a backup superblock) ...
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Why ext4 File System is better than NTFS? [closed]

For a presentation, I need to show ext4 File System is better than NTFS. I searched and got nice article on both ext4 and NTFS http://en.wikipedia.org/wiki/Ext4 http://en.wikipedia.org/wiki/NTFS ...
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Why creating partitions in linux is good solution for easy recovery?

I have heard if you don't make partitins in linux it is so hard to recovery your data. And if you make some partitions it would be easy to recovery. for example if you make /par1 /part2 /part3 it is ...
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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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Why can't I delete my files?

I copied some files from a data DVD to /home/emma (ext4), and all of the files are read only. This is what all of the files are like: emma@emma-W54-55SU1-SUW:~$ stat cd/Drivers/Drivers_List.rtf ...
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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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ext4 corruption found in superblock, but filesystem can be mounted

After a crash, I've got an Ext4 filesystem (on an LVM LV) that gives the following error when running fsck.ext4 -nf: e2fsck 1.42.12 (29-Aug-2014) Corruption found in superblock. (blocks_count = 0). ...
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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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ext4 to btrfs conversion: If I accidentally lose power to the system during the conversion, will I lose the data?

I want to convert the 3TB 80% full ext4 block device into btrfs and I want to estimate the risks involved in the process. If I accidentally lose power to the system during the conversion, will I ...
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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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rsync hangs unless I defrag ext4 filesystem

I have a XBian server (Raspberry Pi version of Debian) running rsync via inetd (not the native dæmon). I am serving a couple of directories on an ext4 filesystem (on a USB disk) as individual modules ...
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Can I find out if a given ext4 block is in the inode table, and if so, can I pick it out of a journal with no header by hand?

So en route from my old laptop to a new one my old laptop's hard drive got some physical damage. badblocks reports 64 bad sectors. I had a two-month-old Ubuntu GNOME setup with a split / and /home ...
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119 views

“First orphan inode” in tune2fs output

I ran tune2fs -l /dev/sda on my production server today and got the following output: tune2fs 1.42.9 (4-Feb-2014) Filesystem volume name: <none> Last mounted on: / Filesystem UUID: ...
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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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data recovery from form an accidental format on ext4 partition

When I was installing Mint Debian edition unlike the classic edition, the installation automatically formated my home partition when I did not specify to format. So the formatting previously was ext4 ...
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Why doesn't the owning group get the executable bit? [duplicate]

Playing with ACL's: [root@rex web]# pwd /media/web [root@rex web]# ll -d drwxr-xr-x. 2 root root 4096 Jan 1 14:31 . [root@rex web]# setfacl -m d:g::rwx . [root@rex web]# setfacl -m g::rwx . ...
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What are the implications of using an inode_ratio of 16384 in terms of storage use on ext4?

I'm assuming that this means that if the average file stored (including directories etc) is less than 16384 bytes, it may be possible to run out of inodes before using the full storage capacity of the ...
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How do I know if a partition is ext2, ext3, or ext4?

I just formatted stuff. One disk I format as ext2. The other I want to format as ext4. I want to test how they perform. Now, how do I know the kind of file system in a partition?
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Size Range of ext4 Filesystem Journal

The minimum and maximum sizes respectively for the ext3 filesystem journal are 1,024 blocks and 102,400 blocks. Similarly — what are the minimum and maximum sizes for the journal on an ext4 ...
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How can I capture a consistent snapshot of a directory and all its children?

We have an application that periodically backs itself up to a directory on the local file system. Inside this directory are several more files and directories. I want to produce a "snapshot" of all ...