While all journaling will return a filesystem to a valid state after a crash, data-mode journaling offers the greatest protection against corruption and data loss. The other filesystems provide ordered-mode journaling, which only logs meta-data. Note: Reiser4 does provide an almost equivalent to ext4's default journaling behavior (meta-data only) with the use of the node41 plugin which also features meta-data and inline checksums, optionally combined with the wandering logs behaviour it provides depending on what transaction model is chosen at mount time. It uses a different journaling techniques: a special model called wandering logs which eliminates the need to write to the disk twice, write-anywhere-a pure copy-on-write approach (mostly equivalent to btrfs' default but with a fundamentally different "tree" design) and a combined approach called hybrid which heuristically alternates between the two former. In the same vein, Reiser4 offers so-called "transaction models" which not only change the features it provides, but in its journaling mode. Data-mode journaling comes with a speed penalty and is not enabled by default. Ext3 and ext4 offer data-mode journaling, which logs both data and meta-data, as well as possibility to journal only meta-data changes. Not all journaling techniques are the same. The logging takes place in a dedicated area of the filesystem. In the event of a system crash or power failure, such file systems are faster to bring back online and less likely to become corrupted. Journaling provides fault-resilience by logging changes before they are committed to the filesystem. Read only, experimental.Īll the above filesystems with the exception of exFAT, ext2, FAT16/32, Reiser4 (optional), Btrfs and ZFS, use journaling.
Windows xfs driver driver#
officially supported kernels are built without CONFIG_NTFS_FS so this driver is not available. Kernel's in-built driver has very limited write support.
File systems supported by the kernel are listed in /proc/filesystems. See filesystems(5) for a general overview and Wikipedia:Comparison of file systems for a detailed feature comparison. Since Arch kernels have most of the file systems built as loadable modules, /proc/filesystems will show very few, if any, usable file systems. Reason: /proc/filesystems only lists file systems whose modules are either built-in or currently loaded.
A brief overview of supported filesystems follows the links are to Wikipedia pages that provide much more information. Each has its own advantages, disadvantages, and unique idiosyncrasies. Individual drive partitions can be setup using one of the many different available filesystems. The structure and logic rules used to manage the groups of information and their names is called a "file system". Taking its name from the way paper-based information systems are named, each group of data is called a "file". By separating the data into pieces and giving each piece a name, the information is easily isolated and identified. Without a file system, information placed in a storage medium would be one large body of data with no way to tell where one piece of information stops and the next begins. In computing, a file system or filesystem controls how data is stored and retrieved.
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