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Subject[PATCH 0/27] nilfs2: continuous snapshotting file system
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This is a new patch set for the nilfs2 file system.

The first submission is found at:

http://marc.info/?l=linux-fsdevel&m=121920195516073

The old patch was not divided, and this time I divided it into 27
patches:

The patch #1 adds a document to Documentation/filesystems/
The patch #2 adds a header file of the disk format to include/linux/
The patches #2-#26 adds nilfs2 source files to fs/nilfs2/
and the patch #27 updates Makefile and Kconfig.

This patch set also includes some cleanups and improvements. The main
changes from the previous patch are as follows:

* Use the standard mm/ cache instead of uniquely implemented page
cache to hold B-tree node buffers; the peculiar page cache was
removed by this.

* Integrate two similar allocators found in DAT and inode file.

* Read requests for GC blocks are now submitted in parallel to
mitigate GC overhead.

More than 2,000 lines are reduced by the cleanups.


The patch set is available from

http://www.nilfs.org/pub/patch/nilfs2-2.6.27-rc6/

If you like a git tree:

http://git.nilfs.org/nilfs2-2.6.git nilfs2
( gitweb: http://www.nilfs.org/git/?p=nilfs2-2.6.git )

The userland tools are included in the nilfs-utils package
which is available on

http://www.nilfs.org/en/download.html


Example:
In this example, /dev/sdb1 is used as a nilfs2 partition.

- To use nilfs2 as a local file system, simply:

# mkfs -t nilfs2 /dev/sdb1
# mount -t nilfs2 /dev/sdb1 /dir

This will also invoke the cleaner through the mount helper program
(mount.nilfs2).

- Checkpoints and snapshots are managed by the following commands.
Their manpages are included in the nilfs-utils package.

lscp list checkpoints or snapshots.
mkcp make a checkpoint or a snapshot.
chcp change an existing checkpoint to a snapshot or vice versa.
rmcp invalidate specified checkpoint(s).

For example,

# lscp /dev/sdb1

will list checkpoints on the device.
The block device argument is omissible if there is no other nilfs2
partition.

# chcp ss 2

will change the past checkpoint No. 2 into snapshot.

# mkcp -s

will make a snapshot of the current state.

# lscp -s

will list snapshots

- To mount a snapshot, use the read-only option and cp= option.

# mount -t nilfs2 -r -o cp=<cno> /dev/sdb1 /snap_dir

where <cno> is the checkpoint number of the snapshot.
Snapshots are mountable concurrently with the writable mount.





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