| Ryusuke Konishi | 4fed598 | 2009-07-12 11:13:55 +0900 | [diff] [blame] | 1 | config NILFS2_FS |
| Kees Cook | f11cb22 | 2012-10-02 11:19:26 -0700 | [diff] [blame] | 2 | tristate "NILFS2 file system support" |
| Ryusuke Konishi | 4fed598 | 2009-07-12 11:13:55 +0900 | [diff] [blame] | 3 | select CRC32 |
| Ryusuke Konishi | 4fed598 | 2009-07-12 11:13:55 +0900 | [diff] [blame] | 4 | help |
| 5 | NILFS2 is a log-structured file system (LFS) supporting continuous |
| 6 | snapshotting. In addition to versioning capability of the entire |
| 7 | file system, users can even restore files mistakenly overwritten or |
| 8 | destroyed just a few seconds ago. Since this file system can keep |
| 9 | consistency like conventional LFS, it achieves quick recovery after |
| 10 | system crashes. |
| 11 | |
| 12 | NILFS2 creates a number of checkpoints every few seconds or per |
| 13 | synchronous write basis (unless there is no change). Users can |
| 14 | select significant versions among continuously created checkpoints, |
| 15 | and can change them into snapshots which will be preserved for long |
| 16 | periods until they are changed back to checkpoints. Each |
| 17 | snapshot is mountable as a read-only file system concurrently with |
| 18 | its writable mount, and this feature is convenient for online backup. |
| 19 | |
| 20 | Some features including atime, extended attributes, and POSIX ACLs, |
| 21 | are not supported yet. |
| 22 | |
| 23 | To compile this file system support as a module, choose M here: the |
| 24 | module will be called nilfs2. If unsure, say N. |