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TOMOYO Linux Cross Reference
Linux/fs/nilfs2/Kconfig

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  1 # SPDX-License-Identifier: GPL-2.0-only
  2 config NILFS2_FS
  3         tristate "NILFS2 file system support"
  4         select BUFFER_HEAD
  5         select CRC32
  6         select LEGACY_DIRECT_IO
  7         help
  8           NILFS2 is a log-structured file system (LFS) supporting continuous
  9           snapshotting.  In addition to versioning capability of the entire
 10           file system, users can even restore files mistakenly overwritten or
 11           destroyed just a few seconds ago.  Since this file system can keep
 12           consistency like conventional LFS, it achieves quick recovery after
 13           system crashes.
 14 
 15           NILFS2 creates a number of checkpoints every few seconds or per
 16           synchronous write basis (unless there is no change).  Users can
 17           select significant versions among continuously created checkpoints,
 18           and can change them into snapshots which will be preserved for long
 19           periods until they are changed back to checkpoints.  Each
 20           snapshot is mountable as a read-only file system concurrently with
 21           its writable mount, and this feature is convenient for online backup.
 22 
 23           Some features including atime, extended attributes, and POSIX ACLs,
 24           are not supported yet.
 25 
 26           To compile this file system support as a module, choose M here: the
 27           module will be called nilfs2.  If unsure, say N.

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