An attribute allows the users to request secure deletion on files. When such a file is deleted, random data is written in the disk blocks previously allocated to the file.
This prevents malicious people from gaining access to the previous content of the file by using a disk editor. Last, new types of files inspired from the 4. Immutable files can only be read: nobody can write or delete them. This can be used to protect sensitive configuration files.
Append-only files can be opened in write mode but data is always appended at the end of the file. Like immutable files, they cannot be deleted or renamed. This is especially useful for log files which can only grow. The physical structure of Ext2 filesystems has been strongly influenced by the layout of the BSD filesystem.
A filesystem is made up of block groups. However, block groups are not tied to the physical layout of the blocks on the disk, since modern drives tend to be optimized for sequential access and hide their physical geometry to the operating system. Each block group contains a redundant copy of crucial filesystem control informations superblock and the filesystem descriptors and also contains a part of the filesystem a block bitmap, an inode bitmap, a piece of the inode table, and data blocks.
Using block groups is a big win in terms of reliability: since the control structures are replicated in each block group, it is easy to recover from a filesystem where the superblock has been corrupted.
In Ext2fs, directories are managed as linked lists of variable length entries. Each entry contains the inode number, the entry length, the file name and its length.
By using variable length entries, it is possible to implement long file names without wasting disk space in directories. This way, it tries to ensure that the next block to read will already be loaded into the buffer cache. Readaheads are normally performed during sequential reads on files and Ext2fs extends them to directory reads, either explicit reads readdir 2 calls or implicit ones namei kernel directory lookup.
Ext2fs also contains many allocation optimizations. Block groups are used to cluster together related inodes and data: the kernel code always tries to allocate data blocks for a file in the same group as its inode. This is intended to reduce the disk head seeks made when the kernel reads an inode and its data blocks. When writing data to a file, Ext2fs preallocates up to 8 adjacent blocks when allocating a new block. This preallocation achieves good write performances under heavy load. It also allows contiguous blocks to be allocated to files, thus it speeds up the future sequential reads.
These two allocation optimizations produce a very good locality of: related files through block groups related blocks through the 8 bits clustering of block allocations.
Ext3 support the same features as Ext2, but includes also Journaling. Software consists of a patch to the linux kernel, and patched versions of various software principally e2fsprogs i. Zimmermann fht-esslingen. You can access read, write, modify your Linux files when running one of the other operating systems.
Additionally a JAVA program as a stand alone graphical user interface is available. Alternatively, you can use your standard web browser as a graphical user interface. Supports hard disks and removable media, including zip and floppy. Uses a windows explorer like interface to show files and details.
Written for Windows NT, but has some support for Windows Large disks can cause problems. Access: Read-only, long filenames supported. The version that is currently released author consider pretty stable. People have been using it for a long time, with no bug reports. The drivers will be pulled into future BeOS releases. It can read and write the actual ext2 version as implemented in Linux for example. The partition size is not limited and the logical sector size can be , or bytes.
The only restriction is that the physical sector size is smaller or equal to the logical sector size. The blocksize can be configured if you initialize the partition with mke2fs. Needs updated for glib libraries. License: GPL Resizes second extended filesystem. To be GPLed once stable. For use with LVM Consists of 2 utilites. If ext2endable has not been run when the file system was created ext2end will only be able to extend it to the next multiple of MB. Author: tgud tochnapc2.
It will show you the ext2 filesystem structures in a nice and intuitive way, letting you easily "travel" between them and making the necessary modifications. Author: Scott D. Supports ext2, minix, and xiafs.
You must patch sources to compile on 2. Next, do a complete file system check with the e2fsck command to fix and repair. To enable the ext4 features on an existing ext3 filesystem, use the command. After running this command we MUST run fsck to fix up some on-disk structures that tune2fs have modified. TecMint is the fastest growing and most trusted community site for any kind of Linux Articles, Guides and Books on the web.
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Thanks for updating us, yes in next update I will add this topic, hopefully, will re-distribute updated copies by next week. Please ignore my previous comment, I was using small o instead capital.
I got it later. You can call it filesystem or partition, nothing makes sense, becasue everything is a file in Linux. I think you mean to say how to change Linux partition Label names, if yes so, you can read this article that explains how to change or modify partition label names on Linux filesystem. A nice way is to manage LVM through ssm. Only one step-we can create a logical volume and volume group, choose file system type.
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