The repository is mainly for course project, aiming at file system teaching process.
在本次实验中结合 Rust 与 C++ 实现了一个暂时不完全的 EXT2 文件系统。
文件系统主要逻辑在 chiro2001/rfs，本 repo 仅是 rfs 的 c++ 调用移植。
- basic
- init
- destory
- lookup
- getattr
- setattr --
rfs.cpp中未完成 - mknod
- mkdir
- readdir
- read -- 读写大于第二层遍历的文件(~16MiB)暂时未测试
- write
- extra
- copy -- 通过添加 abi-7-28 完成
- cache
- journal
首先将 ddriver 编译为静态库 libddriver.a，然后 Rust 部分的 rfs_bind 和 libddriver.a 一同编译，生成 librfs_bind.a 和 lib_rfs_bind_lib.a，最后将 rfs.cpp 与所有的静态库链接起来得到 rfs_drv 可执行文件。
有两种运行方式：
-
直接运行
rfs，使用 Rust 内的FileDiskDrivergit clone https://github.com/chiro2001/rfs # 或者进入项目子目录 # cd fs/rfs/rfs cd rfs cargo run -- -help
$ cargo run -- --help Compiling rfs v0.1.0 (/home/chiro/os/fuse-ext2/fs/rfs/rfs) Finished dev [unoptimized + debuginfo] target(s) in 2.26s Running `target/debug/rfs --help` Usage: rfs [OPTIONS] [mountpoint] Arguments: [mountpoint] Optional mountpoint to mount on [default: tests/mnt] Options: -f, --front Keep daemon running in front --format Format disk --mkfs Use mkfs.ext2 to format disk -r, --read_only Mount as read only filesystem -v, --verbose Print more debug information, or set `RUST_LOG=debug` -d, --device <FILE> Device path (filesystem storage file) [default: ddriver] -h, --help Print help information -V, --version Print version information $-f：阻塞运行，不另外 fork 新进程--format：强制创建新的文件系统--mkfs：创建文件系统的时候使用系统的mkfs.ext2而不是程序内的
当存在环境变量为
RUST_LOG=debug时输出更多调试信息。$ cargo run -- --mkfs -d disk ~/mnt Finished dev [unoptimized + debuginfo] target(s) in 0.05s Running `target/debug/rfs --mkfs -d disk /home/chiro/mnt` [2022-11-30T12:28:55Z INFO rfs] Device: disk [2022-11-30T12:28:55Z INFO rfs] Daemon running at pid: 81716 [2022-11-30T12:28:55Z INFO rfs] [try 1/3] Mount to /home/chiro/mnt [2022-11-30T12:28:55Z INFO fuse::session] Mounting /home/chiro/mnt [2022-11-30T12:28:55Z INFO disk_driver::file] FileDrv open: disk [2022-11-30T12:28:55Z INFO rfs::rfs_lib] disk layout size: 4194304 [2022-11-30T12:28:55Z INFO rfs::rfs_lib] disk unit size: 512 [2022-11-30T12:28:55Z INFO rfs::rfs_lib] Disk disk has 8192 IO blocks. [2022-11-30T12:28:55Z INFO rfs::rfs_lib] disk info: DiskInfo { stats: DiskStats { write_cnt: 0, read_cnt: 0, seek_cnt: 0 }, consts: DiskConst { read_lat: 2, write_lat: 1, seek_lat: 4, track_num: 0, major_num: 100, layout_size: 4194304, iounit_size: 512 } } [2022-11-30T12:28:55Z INFO rfs::rfs_lib] super block size 2 disk block (1024 bytes) [2022-11-30T12:28:55Z INFO rfs::rfs_lib] FileSystem found! [2022-11-30T12:28:55Z INFO rfs::rfs_lib] fs stats: EXT2 1024 inodes, 1 KiB per block, free inodes 1013, free blocks 3950 [2022-11-30T12:28:55Z INFO rfs::rfs_lib] fs layout: | BSIZE = 1024 B | | Boot(1) | Super(1) | GroupDesc(1) | DATA Map(1) | Inode Map(1) | Inode Table(128) | DATA(*) | [2022-11-30T12:28:55Z INFO rfs::rfs_lib] For inode bitmap, see @ 1000 [2022-11-30T12:28:55Z INFO rfs::rfs_lib] For data bitmap, see @ c00 $ echo a>~/mnt/aaaa $ fusermount -u ~/mnt [2022-11-30T12:29:11Z INFO fuse::session] Unmounted /home/chiro/mnt [2022-11-30T12:29:11Z INFO rfs] All Done. $
-
运行
rfs_drv，使用 C++ 端的DDrivercmake -B build -S , cmake --build build
$ ./build/rfs_drv --help usage: ./build/rfs_drv mountpoint [options] general options: -o opt,[opt...] mount options -h --help print help -V --version print version FUSE options: -d -o debug enable debug output (implies -f) -f foreground operation -s disable multi-threaded operation -o allow_other allow access to other users -o allow_root allow access to root -o auto_unmount auto unmount on process termination -o nonempty allow mounts over non-empty file/dir -o default_permissions enable permission checking by kernel -o fsname=NAME set filesystem name -o subtype=NAME set filesystem type -o large_read issue large read requests (2.4 only) -o max_read=N set maximum size of read requests -o hard_remove immediate removal (don't hide files) -o use_ino let filesystem set inode numbers -o readdir_ino try to fill in d_ino in readdir -o direct_io use direct I/O -o kernel_cache cache files in kernel -o [no]auto_cache enable caching based on modification times (off) -o umask=M set file permissions (octal) -o uid=N set file owner -o gid=N set file group -o entry_timeout=T cache timeout for names (1.0s) -o negative_timeout=T cache timeout for deleted names (0.0s) -o attr_timeout=T cache timeout for attributes (1.0s) -o ac_attr_timeout=T auto cache timeout for attributes (attr_timeout) -o noforget never forget cached inodes -o remember=T remember cached inodes for T seconds (0s) -o nopath don't supply path if not necessary -o intr allow requests to be interrupted -o intr_signal=NUM signal to send on interrupt (10) -o modules=M1[:M2...] names of modules to push onto filesystem stack -o max_write=N set maximum size of write requests -o max_readahead=N set maximum readahead -o max_background=N set number of maximum background requests -o congestion_threshold=N set kernel's congestion threshold -o async_read perform reads asynchronously (default) -o sync_read perform reads synchronously -o atomic_o_trunc enable atomic open+truncate support -o big_writes enable larger than 4kB writes -o no_remote_lock disable remote file locking -o no_remote_flock disable remote file locking (BSD) -o no_remote_posix_lock disable remove file locking (POSIX) -o [no_]splice_write use splice to write to the fuse device -o [no_]splice_move move data while splicing to the fuse device -o [no_]splice_read use splice to read from the fuse device Module options: [iconv] -o from_code=CHARSET original encoding of file names (default: UTF-8) -o to_code=CHARSET new encoding of the file names (default: UTF-8) [subdir] -o subdir=DIR prepend this directory to all paths (mandatory) -o [no]rellinks transform absolute symlinks to relative
经过格式化后的磁盘文件可以被 fuse-ext2 识别并挂载。
$ file disk
disk: Linux rev 0.0 ext2 filesystem data, UUID=c30eff85-3ac3-4290-9c25-1a166e101635
$ fuse-ext2 disk ~/mnt -o rw+
$ ls ~/mnt -lahi
总计 18K
1 drwxr-xr-x 3 root root 1.0K 11月29日 15:40 .
12058626 drwx------ 96 chiro chiro 4.0K 11月30日 20:36 ..
3 drwxr-xr-x 0 root root 1.0K 11月30日 20:25 a
4 -rw-r--r-- 0 root root 2 11月30日 20:29 aaaa
2 drwx------ 2 root root 12K 11月29日 15:40 lost+found
$ fusermount -u ~/mnt
$ cargo run -- -d disk ~/mnt
Finished dev [unoptimized + debuginfo] target(s) in 0.05s
Running `target/debug/rfs -d disk /home/chiro/mnt`
[2022-11-30T12:37:35Z INFO rfs] Device: disk
[2022-11-30T12:37:35Z INFO rfs] Daemon running at pid: 86525
[2022-11-30T12:37:35Z INFO rfs] [try 1/3] Mount to /home/chiro/mnt
[2022-11-30T12:37:35Z INFO fuse::session] Mounting /home/chiro/mnt
[2022-11-30T12:37:35Z INFO disk_driver::file] FileDrv open: disk
[2022-11-30T12:37:35Z INFO rfs::rfs_lib] disk layout size: 4194304
[2022-11-30T12:37:35Z INFO rfs::rfs_lib] disk unit size: 512
[2022-11-30T12:37:35Z INFO rfs::rfs_lib] Disk disk has 8192 IO blocks.
[2022-11-30T12:37:35Z INFO rfs::rfs_lib] disk info: DiskInfo { stats: DiskStats { write_cnt: 0, read_cnt: 0, seek_cnt: 0 }, consts: DiskConst { read_lat: 2, write_lat: 1, seek_lat: 4, track_num: 0, major_num: 100, layout_size: 4194304, iounit_size: 512 } }
[2022-11-30T12:37:35Z INFO rfs::rfs_lib] super block size 2 disk block (1024 bytes)
[2022-11-30T12:37:35Z INFO rfs::rfs_lib] FileSystem found!
[2022-11-30T12:37:35Z INFO rfs::rfs_lib] fs stats: EXT2 1024 inodes, 1 KiB per block, free inodes 1013, free blocks 3950
[2022-11-30T12:37:35Z INFO rfs::rfs_lib] fs layout:
| BSIZE = 1024 B |
| Boot(1) | Super(1) | GroupDesc(1) | DATA Map(1) | Inode Map(1) | Inode Table(128) | DATA(*) |
[2022-11-30T12:37:35Z INFO rfs::rfs_lib] For inode bitmap, see @ 1000
[2022-11-30T12:37:35Z INFO rfs::rfs_lib] For data bitmap, see @ c00
$ ls ~/mnt -lahi
总计 18K
1 drwxr-xr-x 3 root root 1.0K 11月29日 15:40 .
12058626 drwx------ 96 chiro chiro 4.0K 11月30日 20:37 ..
97 drwxr-xr-x 0 root root 1.0K 11月30日 20:25 a
100 -rw-r--r-- 0 root root 2 11月30日 20:29 aaaa
11 drwx------ 2 root root 12K 11月29日 15:40 lost+found
$ mount
// ...
rfs on /home/chiro/mnt type fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)
$ fusermount -u ~/mnt
[2022-11-30T12:38:57Z INFO fuse::session] Unmounted /home/chiro/mnt
[2022-11-30T12:38:57Z INFO rfs] All Done.
$