| # 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. |
