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ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3. ext4 was initially a series of backward-compatible extensions to ext3, many of them originally developed by Cluster File Systems for the Lustre file system between 2003 and 2006, meant to extend storage limits and add other performance ...
The extended file system, or ext, was implemented in April 1992 as the first file system created specifically for the Linux kernel. Although ext is not a specific file system name, it has been succeeded by ext2, ext3, and ext4.
In Linux, the ext2, ext3, ext4, JFS, Squashfs, UBIFS, Yaffs2, ReiserFS, Reiser4, XFS, Btrfs, OrangeFS, Lustre, OCFS2 1.6, ZFS, and F2FS [11] filesystems support extended attributes (abbreviated xattr) when enabled in the kernel configuration. Any regular file or directory may have extended attributes consisting of a name and associated data.
Definition Example; contains: Keeps results focused on sites that have links to the file types that you specify. To search for websites that contain links to Microsoft Windows Media Audio (.wma) files, type music contains:wma. ext: Returns only webpages with the filename extension that you specify.
Typical file attributes may, for example, indicate or specify whether a file is visible, modifiable, compressed, or encrypted. The availability of most file attributes depends on support by the underlying filesystem (such as FAT, NTFS, ext4) where attribute data must be stored along with other control structures. Each attribute can have one of ...
Ext4 has a file system option called inline_data that allows ext4 to perform inlining if enabled during file system creation. Because an inode's size is limited, this only works for very small files. Because an inode's size is limited, this only works for very small files.
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Not all filesystems make use of trim. Among the filesystems that can issue trim requests automatically are ext4, [25] Btrfs, [26] FAT, GFS2, JFS, [27] XFS, [28] ZFS, [29] and NTFS-3G. However, in some distributions, this is disabled by default due to performance concerns, [30] in favor of scheduled trimming on supported SSDs. [31]