| Ryusuke Konishi | 4fed598 | 2009-07-12 11:13:55 +0900 | [diff] [blame] | 1 | config NILFS2_FS |
| 2 | tristate "NILFS2 file system support (EXPERIMENTAL)" |
| Ryusuke Konishi | 41f4db0 | 2009-08-08 16:09:46 +0900 | [diff] [blame] | 3 | depends on EXPERIMENTAL |
| Ryusuke Konishi | 4fed598 | 2009-07-12 11:13:55 +0900 | [diff] [blame] | 4 | select CRC32 |
| Hiroshi Shimamoto | e4c570c | 2009-12-14 18:00:26 -0800 | [diff] [blame^] | 5 | select FS_JOURNAL_INFO |
| Ryusuke Konishi | 4fed598 | 2009-07-12 11:13:55 +0900 | [diff] [blame] | 6 | help |
| 7 | NILFS2 is a log-structured file system (LFS) supporting continuous |
| 8 | snapshotting. In addition to versioning capability of the entire |
| 9 | file system, users can even restore files mistakenly overwritten or |
| 10 | destroyed just a few seconds ago. Since this file system can keep |
| 11 | consistency like conventional LFS, it achieves quick recovery after |
| 12 | system crashes. |
| 13 | |
| 14 | NILFS2 creates a number of checkpoints every few seconds or per |
| 15 | synchronous write basis (unless there is no change). Users can |
| 16 | select significant versions among continuously created checkpoints, |
| 17 | and can change them into snapshots which will be preserved for long |
| 18 | periods until they are changed back to checkpoints. Each |
| 19 | snapshot is mountable as a read-only file system concurrently with |
| 20 | its writable mount, and this feature is convenient for online backup. |
| 21 | |
| 22 | Some features including atime, extended attributes, and POSIX ACLs, |
| 23 | are not supported yet. |
| 24 | |
| 25 | To compile this file system support as a module, choose M here: the |
| 26 | module will be called nilfs2. If unsure, say N. |