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- # SPDX-License-Identifier: GPL-2.0-only
- config NILFS2_FS
- tristate "NILFS2 file system support"
- select BUFFER_HEAD
- select CRC32
- select LEGACY_DIRECT_IO
- help
- NILFS2 is a log-structured file system (LFS) supporting continuous
- snapshotting. In addition to versioning capability of the entire
- file system, users can even restore files mistakenly overwritten or
- destroyed just a few seconds ago. Since this file system can keep
- consistency like conventional LFS, it achieves quick recovery after
- system crashes.
- NILFS2 creates a number of checkpoints every few seconds or per
- synchronous write basis (unless there is no change). Users can
- select significant versions among continuously created checkpoints,
- and can change them into snapshots which will be preserved for long
- periods until they are changed back to checkpoints. Each
- snapshot is mountable as a read-only file system concurrently with
- its writable mount, and this feature is convenient for online backup.
- Some features including atime, extended attributes, and POSIX ACLs,
- are not supported yet.
- To compile this file system support as a module, choose M here: the
- module will be called nilfs2. If unsure, say N.
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