NILFSv2 - "log-structured" filerendszer Linux-hoz

• Slick snapshots
• Garbage Collection with snapshots
• B-tree based file and inode management
• Immediate recovery after system crash
• 64-bit data structures; support many files, large files and disks
• Loadable kernel module; no recompilation of the kernel is required

Mi kerül bele hamarosan?

• Variety of Garbage Collectio policies.
• Supporting block sizes smaller than the page size (e.g. 1KB or 2KB for the i386 architecture).
• Better error handling.
  • -- improved on NILFS 1.0.10. (Jul 18, 2006)
• Sophisticated file system interface.
• Snapshot management mechanism.
• Basic administration tools such as fsck.
• O_DIRECT support.
  • -- Direct I/O read was implemented on NILFS 1.0.5; direct I/O write is falled back to the buffered write at present. (Jan 30, 2006)
• Efficient synchronous write operations including fsync(), open() with O_SYNC, and so on.
• mmap() support.
  • -- mmap read and write were implemented on NILFS 1.0.9. (May 23, 2006)
• An extended attribute support.
• Quota support.
• atime support.
• Filesystem label support.
• Strict BIO order with a barrier option; ensure the checkpoint blocks and the segusage blocks will be written to the disk in correct order.
  • -- Implemented experimentally on NILFS 1.0.4 (Jan 18, 2006)
  • -- Turned on the barrier mount option by default on NILFS 1.0.10 (Jul 18, 2006)
• Redundant mechanism for critically important blocks (the super block and the segusage blocks).
• B-tree base directory management.
• More sophisticated B-tree node block management.
• Fixing identified bugs (to be described).
• Testing on the other architectures.
  • - Under testing on x86_64 and ppc64 on NILFS 1.0.14 (Oct 25, 2006)
• Performance tuning (e.g. read ahead).
• Source code cleanup.
• Documentation.
  • -- A few documents are included on NILFS 1.0.4 (Jan 18, 2006)

További tervezett szolgáltatások:

• "Time-based" tools (e.g. tls, tdiff, tgrep, tfind, ttar and so on. They come from the Elephant file system).
• GUI tools.
• GNU GRUB support.
• POSIX ACL support.
• Execute-in-Place (XIP) support.
• Porting to MS-Windows (some people want it).
• Native Language Support (NLS).
• Online resizing.
• Extent support.
• Better support of remote block devices (e.g. iSCSI).
• Optimization of the cleaner is one of main challenges in the NILFS project.
• Seamless backup mechanism of accumulated past data to the secondary drives or the remote drives.
• And more...

A NILFSv2-ről bővebben itt. A honlapja itt. A bejelentés itt.

Egy cikk a nemrég bejelentette btrfs-ről és a NILFSv2-ről Jonathan Corbet tollából itt. LWN cikk itt.