Tagged Questions
1
vote
0answers
52 views
EXT3 file operations [migrated]
I am trying to follow how Linux deals with EXT3 files.
I am looking at fs/ext3/file.c where there are file operations that deal with the files are present:
const struct file_operations ...
1
vote
2answers
226 views
ext3 root filesystems goes read-only with aborted journal even after repairs
Short version: ext3 root filesystem on rackspace (xen) VM detects aborted journal on boot and mounts read-only. I've attempted to repair this from a rescue environment with tune2fs and e2fsck as ...
4
votes
1answer
142 views
Is it possible to disable file permissions on a ext3 or ext4 file-system?
Is it possible to disable file permissions on an ext3/4 file-system?
Just wondering if it's possible to completely disable or ignore file permissions on a ext3 or ext4 file system. Perhaps a mounting ...
3
votes
1answer
65 views
md5sum change after mount?
I have a ext3 filesystem on a .img file. After mounting and unmounting it, I noticed that the md5sum is changed, even if no file inside was changed!
md5sum myfilesystem.img
XXXX myfilesystem.img
...
3
votes
2answers
179 views
Location of inodes (ext)?
Say I want to observe how the flow from file name to cluster on hard disc goes.
I get the inode number of I file (which is mapped in a directory data):
1863 autorun.inf
So, now i know that i have ...
2
votes
1answer
158 views
Any command to view the file system internal fragmentation size under a directory?
If the block size of a file system is 4KB, then for a 1KB file, 3KB space(which is internal fragmentation) is wasted. So, under a directory, is there any command to summarize how much disk space is ...
2
votes
1answer
151 views
How do I choose between ext 3 and 4?
I tried looking at the difference, the main ones seem to be 4 supports more subdirectories in a file, supports larger files, has delayed write which I don't prefer as I don't want data loss. I also ...
2
votes
1answer
184 views
How to fix a fragmented ext disk - myth or truth?
I just read this article about the virtually non-existent disk fragmentation on *nix filesystems.
It was mentioned that due to the way ext handles writing data to the disks, fragmentation may only ...
3
votes
2answers
431 views
Besides the journal, what are the differences between ext2 and ext3?
I just saw an answer question about filesystems for embedded hardware on another Stack Exchange site. The question was "What file system format should I use on flash memory?" and the answer suggested ...
5
votes
1answer
1k views
largefile feature at creating file-system
Is useful to use -T largefile flag at creating a file-system for a partition with big files like video, and audio in flac format?
I tested the same partition with that flag and without it, and using ...
5
votes
3answers
400 views
ext2/3/4 reserved blocks percentage purpose
I know that this feature dates back 20 years but I still would like to find out
What is the purpose of the reserved blocks in ext2/3/4 filesystems?
11
votes
1answer
283 views
How to compact a directory
Every so often, some application runs wild and fills a directory with a huge amount of files. Once we fix the bug and clean up the files, the directory stays big (>50MB) even though there's only 20-30 ...
0
votes
1answer
792 views
How to resize ext3 image files
I have created an 200MB ext3 using the following commands.
dd if=/dev/zero of=./system.img bs=1000000 count=200
mkfs.ext2 ./system.img
tune2fs -j ./system.img
How can I resize it to 50MB and 300MB? ...
5
votes
2answers
218 views
Testing ext3 filesystem on embedded device [closed]
My set up:
An embedded device with flash memory on it.
Flash is partitioned into ext3 filesystem partitions.
Have busybox on it.
My Goal:
To uncover errors /bugs/ problems on ext3 filesystems.
...
2
votes
1answer
109 views
“Short read block” error trying to boot RHEL
I changed my network configurations from static IP to DHCP and removed the DNS entry, etc.
Then I rebooted the computer, but am now unable to boot, I get an error message along the lines of "short ...
3
votes
1answer
747 views
What is a fragment size in an ext3 filesystem?
This is an output from dumpe2fs:
root: ~/# dumpe2fs -h /dev/sdb3 | grep -i 'fragment|block size'
dumpe2fs 1.39 (29-May-2006)
Block size: 4096
Fragment size: 4096
Fragments ...
1
vote
1answer
168 views
With full data journaling, why does data appear in the directory immediately?
I've got a question regarding full data journaling on ext3 filesystems. The man page states the following:
data=journal
All data is committed into the journal prior to being written into
the main ...
6
votes
1answer
3k views
Difference between block size and cluster size
I've got a question concerning the block size and cluster size. Regarding to what I have read about that I assume the following:
The block size is the physical size of a block, mostly 512 bytes. ...
3
votes
1answer
405 views
Where can I see the last mount time?
E.g: I need to know when was the last time a pendrive was mounted. Where could I see that? The pendrive has e.g.: FAT32, EXT3 filesystem.
3
votes
1answer
1k views
What options are there for tuning Linux file system caching?
What various types of caching are possible in the ext3 file system and how can their values be changed using system calls or other methods? I don't want to use commands or tools.
3
votes
3answers
636 views
How many bits is the access flags of a file?
How many bits on a linux file system is taken up for the permissions of a file?
3
votes
1answer
158 views
EXT3 file system pre digest material
I am looking for understanding EXT3 filesystem source code. I think I need a little pre-digestion to fully understand the code. Can anyone please suggest some material(blog etc.) where I can get some ...
8
votes
2answers
872 views
How to repair an ext3 partition after broken resize operation?
I was using gparted to resize a near-terabyte ext3 partition, adding about 40 GB to the left. After nearly 12 hours of moving data (and with 23 more hours estimated to remain) the system hung. Now ...
