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

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Recovering ext4 superblocks

Recently, my external hard drive enclosure failed (the hard drive itself powers up in another enclosure). However, as a result, it appears its EXT4 file system is corrupt. The drive has a single ...
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1answer
955 views

how to make malware file readable with “No read permission on file” on linux ext-4?

There is an ongoing campaign of sending virus/trojans in e-mail messages faked as being from HSBC Bank, Lloyds TSB, Amazon etc. The trojan/virus is sent in a application/zip attachment. I've saved ...
11
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1answer
11k views

How can I mount filesystems with > 4KB block sizes?

I have a 3TB hard disk pulled out of a WD Mybook Live NAS. The partition table is as follows: Model: ATA WDC WD30EZRS-11J (scsi) Disk /dev/sdb: 3001GB Sector size (logical/physical): 512B/4096B ...
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3answers
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“write-once archive”: ext2 vs ext4^has_journal vs

summary Suppose one is setting up an external drive to be a "write-once archive": one intends to reformat it, copy some files that will (hopefully) never be updated, then set it aside until I need to ...
60
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8answers
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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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1answer
19 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 ...
2
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2answers
731 views

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). ...
3
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1answer
90 views

Formatting an sdcard with mkfs hangs indefinitely

I am trying to format an sdcard following this guide. I am able to successfully create the partition table, but attempting to format the Linux partition with mkfs yields the following output: mke2fs ...
3
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1answer
33 views

If I grow an ext4 partition, will it increase the number of inodes available?

If I create a small filesystem, and grow it when I need to, will the number of inodes increase proportionally? I want to use Docker with the overlay storage driver. This can be very inode hungry ...
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7answers
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Tell fs to free space from deleted files NOW

Is there a way to tell the kernel to give back the free disk space now? Like a write to something in /proc/ ? Using Ubuntu 11.10 with ext4. This is probably an old and very repeated theme. After ...
11
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1answer
2k views

Why is this empty directory 3.5MB?

I've just read this question: What does size of a directory mean in output of 'ls -l' command? ...which doesn't quite answer my question. Basically, I'm moving files onto a NAS. The folders ...
4
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1answer
275 views

File containing ext filesystem

Let's suppose I create a file, map it to /dev/loop0, and create a LUKS partition inside dd if=/dev/zero of=myfile bs=1M count=1000 losetup /dev/loop0 myfile cryptsetup -c aes-cbc-essiv:sha256 -s 256 ...
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7answers
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Sync writes very slow. Ubuntu 10.10, 32 bits, ext4

I am running ActiveMQ on my Macbook Pro that runs Ubuntu 10.10, 32 bits with an ext4 partition. Linux iker-laptop 2.6.35-23-generic-pae #40-Ubuntu SMP Wed Nov 17 22:32:51 UTC 2010 i686 GNU/Linux If ...
0
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0answers
30 views

Files Just Go Missing On ext4 Partition (within TrueCrypt Volume)

There are spooky things happening on one of my external hard drives. It's a 3 TB hard drive with: one big partition taking up basically all the storage space there is, and a pretty small partition ...
2
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0answers
53 views

tune2fs - how much space to reserve on large ext4 filesystem

I am aware that there are several questions concerning how much space to reserve on a filesystem using tune2fs -m, but some of the advice is contradictory, some seems to be relevant only to the ...
3
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1answer
32 views

Can I create a file on ext4 with a depth > 1 for testing purposes?

In order to test an analysis tool, I need a file where the depth (eh.eh_depth) is greater than 1. I've tried a couple of things: A large file (1GiB) Creating hundreds of smaller files (1MiB), ...
3
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1answer
38 views

Decrypt a portion of a corrupted drive

I have a hard drive that got corrupted after a doing an MTP mounting of a cell phone. It was created under Fedora Core 20 using defaults. Originally, I thought I did it as an ext4 partition. I ...
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0answers
62 views

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 ...
2
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1answer
76 views

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 ...
3
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1answer
34 views

Any way to help “visualize” the superblock, filesystem, group descriptors, etc

I've been reading a lot about filesystems, trying to learn all I can in depth, but I'm having trouble really visualizing some of it, especially when it comes to things like the superblock, group ...
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0answers
23 views

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 ...
3
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3answers
102 views

How can I identify the filesystem/partition type

My hard drive got corrupted at some point after mounting an mtpfs system. I would ask how to fix that, but I'm not confident about the partition and file system types. My OS is new Fedora Core 23, ...
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0answers
56 views

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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0answers
16 views

GlusterFS on EXT4 is stable enough?

I saw an Article on Rackspace about setting up GlusterFS without using XFS but instead, it uses EXT4. I've been wondering about setup like that since before, to know whether it is production ready ...
0
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1answer
187 views

File type inode/x-corrupted

My system had an unexpected shutdown. Now when I open the file from pcmanfm or nautilus I get file corrupted error. Strangely the files are accessible just fine if I launch pcmanfmas root user. The ...
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2answers
5k views

How to fix intermittant “No space left on device” errors during mv when device has plenty of space?

Ubuntu 14.04 on a desktop Source Drive: /dev/sda1: 5TB ext4 single drive volume Target Volume: /dev/mapper/archive-lvarchive: raid6 (mdadm) 18TB volume with lvm partition and ext4 There are ...
3
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1answer
119 views

To use -c0 -i0 in file-systems with journal

I've several partitions with ext4. Now, I would want if it makes sense to use tune2fs with flags -c0 (max-mount-counts) and -i0 (interval-between-checks) in the partitions with a journal file-system ...
2
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1answer
61 views

Disappearance of files in all ext4 filesystems of a Debian server

Apparently the disappearance of files and directories occurred in all ext4 filesystems, including files and directories usually "read-only" in /var and /usr, like binaries installed for gcc, and ...
4
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2answers
5k views

recovering ext4 partition after dd'ing over start of HD

I accidentally used dd and wrote over the first 208MB of my external disk. What I wrote over is a partition on its own (Debian nestinstaller) so what I see now is not my old (now damaged) ext4 ...
5
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1answer
4k views

Is there any difference between e2fsck and e4fsck on CentOS / RHEL systems?

ext4.wiki.kernel.org makes it sound like e2fsck was simply renamed to e4fsck so that e4fsprogs and e2fsprogs could coexist without overlapping. However, there is no mention of any difference in the ...
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1answer
102 views

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 ...
1
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1answer
5k views

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 ...
3
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1answer
58 views

Many transient files on journaled filesystem?

Writing and deleting many files quickly I'm going to write many temporary files per second, over a sustained period. Each will be deleted after some milliseconds. Say we have an image processing ...
0
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1answer
48 views

how to get crtime of a file in an ext4 partition as a single number or string

I am seeking a method of getting the crtime of a file in hexadecimal or decimal in unix epoch seconds instead of in a date and clock format and with no additional output. This command adds additional ...
0
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1answer
589 views

how to restore a logical partition to its original ext4 format

This question is following Unable to mount /home/ partition after reinstalling grub after reinstalling windows 7 where the diagnostic was that installing windows 7 deleted my /home partition, lovingly ...
4
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1answer
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Ext4: I/O errors on a clean external drive

So I've an external Seagate hard disk that I used to mount on my Mac through Paragon ExtFS. For some unknown reason it stopped to mount on my Mac due to I/O errors - I may have removed the drive ...
0
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1answer
16 views

fat32 partition overwritten by Mint image

Was Running Mint 17.1 Two Kingston USB devices attached accidentally written a Mint image the the archive Kingston by the image writer, and lost my fat32 partition with important data collection. ...
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0answers
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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 ...
33
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3answers
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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 ...
2
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1answer
38 views

Comparing 2 partitions on identical disks

I have 2 physically identical disks. Each with 1 partition: | Disk | FS | Size | Comment | |----------+------+----------+----------------------------------| | ...
3
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2answers
837 views

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 ...
0
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1answer
79 views

How can I zero the unused blocks on my filesystem in order to minimize the compressed disk image size? [duplicate]

If I dd my disk and compress the image with lzma or lzo the image is still big. The partition is 10GB used, 90GB available. But the image still around 20GB. I believe that is because I have copied ...
10
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3answers
8k views

External hard drive permissions - ext4

I have an external USB 3 disk drive (2TB capacity) that is most likely going to be moved from machine to machine. The disk has a GUID partition table and an ext4 partition. I am unable to write to the ...
2
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0answers
39 views

How do distribution installers avoid ext2/3/4 initialization?

When I format a volume with ext4, I have two options regarding initialization. I can either use lazy_itable_init=1 (the default setting) to delay initialization until after the volume is first ...
4
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4answers
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How do I find the offset of an ext4 filesystem?

I have a failing hard drive that is unable to write or read the first sectors of the disk. It just gives I/O errors and that is all there is. There are other areas on the disk that seem (mostly) fine. ...
5
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2answers
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Finding the offset for ext4 partition

I've created an image of my hd with dd, but grub was installed on it, and I'm trying to figure out how to mount the image file, but mount doesn't recognise it as an ext4 partition because of the grub ...
2
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0answers
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ext4 inodes in use for files that are missing

Executive summary: Every tool I've tried confirms lots of inodes in use on this ext4 partition Every tool I've tried shows me that there are no files on the partition It's not files held open and ...
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2answers
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ext4 reported as clean by fsck after hard reset: Is that normal?

My root-partition is formatted as ext4-filesystem. I notice that, whenever my machine crashes and I have to hard-reset it, when booting up again and the root filesystem is checked this step takes a ...
0
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1answer
157 views

How can I convert a disk from ext4 to ext2?

I have Ubuntu with a root volume using ext4. I need to downgrade it so that it is using ext2. Is there a way to do that?
2
votes
0answers
36 views

What happens to directory entry when a file is renamed

What exactly happens to the directory entry when a file is renamed? Is it that the entry of the oldfile is flushed and the newfile is replaced at it's place or a completely new entry is made at the ...