nilfs2: update makefile and Kconfig
This adds a Makefile for the nilfs2 file system, and updates the
makefile and Kconfig file in the file system directory.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/Kconfig b/fs/Kconfig
index 86b203f..9f7270f 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -175,9 +175,34 @@
source "fs/romfs/Kconfig"
source "fs/sysv/Kconfig"
source "fs/ufs/Kconfig"
-
source "fs/exofs/Kconfig"
+config NILFS2_FS
+ tristate "NILFS2 file system support (EXPERIMENTAL)"
+ depends on BLOCK && EXPERIMENTAL
+ select CRC32
+ 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.
+
endif # MISC_FILESYSTEMS
menuconfig NETWORK_FILESYSTEMS