task_struct: make journal_info conditional
[deliverable/linux.git] / fs / nilfs2 / Kconfig
1 config NILFS2_FS
2 tristate "NILFS2 file system support (EXPERIMENTAL)"
3 depends on EXPERIMENTAL
4 select CRC32
5 select FS_JOURNAL_INFO
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.
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