EROFS vs F2FS vs Btrfs vs reiserFS vs EXT4 性能比对

操作系统-番外-基于NAND存储设备文件系统F2FS
https://houwanfei.github.io/2020/07/02/%E6%93%8D%E4%BD%9C%E7%B3%BB%E7%BB%9F-%E7%95%AA%E5%A4%96-%E5%9F%BA%E4%BA%8ENAND%E5%AD%98%E5%82%A8%E8%AE%BE%E5%A4%87%E6%96%87%E4%BB%B6%E7%B3%BB%E7%BB%9FF2FS/

F2FS文件系统一 设计背景及框架结构
https://blog.csdn.net/frank_zyp/article/details/96426334

F2FS文件系统二 实验分析f2fs文件系统
https://blog.csdn.net/frank_zyp/article/details/96474245

EROFS - Enhanced Read-Only File System
https://docs.kernel.org/filesystems/erofs.html

EROFS
https://source.android.com/docs/core/architecture/kernel/erofs

LWN: 华为EROFS文件系统
https://blog.csdn.net/Linux_Everything/article/details/100088476

浅谈华为EROFS文件系统的两个主要技术
https://blog.csdn.net/shuangguo121/article/details/90901131

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code base:

erofs src:
最新稳定版的mkfs.erofs可以从这里拿到，内含README文件。
https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git/
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git -b dev
https://github.com/torvalds/linux/tree/master/fs/erofs

f2fs src
https://github.com/torvalds/linux/tree/master/fs/f2fs

btrfs src
https://github.com/torvalds/linux/tree/master/fs/btrfs

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Here is the main features of EROFS:

• Little endian on-disk design;

• 4KiB block size and 32-bit block addresses, therefore 16TiB address space at most for now;

• Two inode layouts for different requirements:

  Inode metadata size	32 bytes	64 bytes
  Max file size	4 GiB	16 EiB (also limited by max. vol size)
  Max uids/gids	65536	4294967296
  Per-inode timestamp	no	yes (64 + 32-bit timestamp)
  Max hardlinks	65536	4294967296
  Metadata reserved	8 bytes	18 bytes

• Metadata and data could be mixed as an option;

• Support extended attributes (xattrs) as an option;

• Support tailpacking data and xattr inline compared to byte-addressed unaligned metadata or smaller block size alternatives;

• Support POSIX.1e ACLs by using xattrs;

• Support transparent data compression as an option: LZ4 and MicroLZMA algorithms can be used on a per-file basis; In addition, inplace decompression is also supported to avoid bounce compressed buffers and page cache thrashing.

• Support direct I/O on uncompressed files to avoid double caching for loop devices;

• Support FSDAX on uncompressed images for secure containers and ramdisks in order to get rid of unnecessary page cache.

• Support multiple devices for multi blob container images;

• Support file-based on-demand loading with the Fscache infrastructure.

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ext4、ntfs、xfs、btrfs、zfs、f2fs和reiserFS性能测试对比
https://blog.csdn.net/linkyy5/article/details/125955196

Linux 5.14 SSD Benchmarks With Btrfs vs. EXT4 vs. F2FS vs. XFS
phoronix.com/news/Linux-5.14-File-Systems

Btrfs 介绍与相关操作
https://arch.icekylin.online/advanced/btrfs.html#btrfs-%E7%9A%84%E5%8E%86%E5%8F%B2

 

　　　　　　　　　　　　　　　　　　Btrfs 与其它文件系统功能比较

Feature	Ext 2 / 3	Ext 4	ReiserFS	XFS	OCFS2	Btrfs
Journal (date / metadata)	⚫ / ⚫	⚫ / ⚫	⚪ / ⚫	⚪ / ⚫	⚪ / ⚫	N/A
Journal (internal / external)	⚫ / ⚫	⚫ / ⚫	⚫ / ⚫	⚫ / ⚫	⚫ / ⚪	N/A
Offline extend / shrink	⚫ / ⚫	⚫ / ⚫	⚫ / ⚫	⚪ / ⚪	⚫ / ⚪	⚫ / ⚫
Online extend / shrink	⚫ / ⚪	⚫ / ⚪	⚫ / ⚪	⚫ / ⚪	⚫ / ⚪	⚫ / ⚫
Inode allocation map	table	table	B*-tree	B+-tree	table	B-tree
Sparse files	⚫	⚫	⚫	⚫	⚫	⚫
Tail packing	⚪	⚫	⚫	⚪	⚪	⚫
Defragmentation	⚪	⚫	⚪	⚫	⚪	⚫
ExtArributes / ACLs	⚫ / ⚫	⚫ / ⚫	⚫ / ⚫	⚫ / ⚫	⚫ / ⚫	⚫ / ⚫
Quotas	⚫	⚫	⚫	⚫	⚫	🔴
Dump / restore	⚫	⚫	⚪	⚫	⚪	⚪
Default block size	4 KiB	4 KiB	4 KiB	4 KiB	4 KiB	4 KiB
max. file system size	16 TiB	1 EiB	16 TiB	8 EiB	4 PiB	16 EiB
max. file size	2 TiB	1 EiB	1 EiB	8 EiB	4 PiB	16 EiB
Support status	SLES	SLES	SLES	SLES	SLE HA	SLES

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按照进率1024（2的十次方）计算：
https://www.cnblogs.com/daysme/p/12162572.html

 

1Byte = 8 Bit

1 KB = 1,024 Bytes　

1 MB = 1,024 KB = 1,048,576 Bytes　

1 GB = 1,024 MB = 1,048,576 KB = 1,073,741,824 Bytes

1 TB = 1,024 GB = 1,048,576 MB = 1,073,741,824 KB = 1,099,511,627,776 Bytes

1 PB = 1,024 TB = 1,048,576 GB =1,125,899,906,842,624 Bytes

1 EB = 1,024 PB = 1,048,576 TB = 1,152,921,504,606,846,976 Bytes

1 ZB = 1,024 EB = 1,180,591,620,717,411,303,424 Bytes

1 YB = 1,024 ZB = 1,208,925,819,614,629,174,706,176 Bytes