Commit | Line | Data |
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4fed598a RK |
1 | config NILFS2_FS |
2 | tristate "NILFS2 file system support (EXPERIMENTAL)" | |
41f4db0f | 3 | depends on EXPERIMENTAL |
4fed598a | 4 | select CRC32 |
e4c570c4 | 5 | select FS_JOURNAL_INFO |
4fed598a RK |
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. |