Module vfs

Expand description

Virtual File System (VFS) - Plan 9-inspired namespace.

The VFS provides:

Scheme abstraction: Pluggable backends (IPC, kernel, devices)
Mount table: Map path prefixes to schemes
File descriptors: Per-process FD tables
Path resolution: Navigate the namespace hierarchy

§Architecture

User syscall (open "/net/tcp/0")
     ↓
VFS::open() : path resolution
     ↓
MountTable::resolve() → ("/net" → IpcScheme, "tcp/0")
     ↓
IpcScheme::open("tcp/0") → IPC message to network stack
     ↓
OpenFile created with scheme reference + file_id
     ↓
FD allocated in process FD table
     ↓
Returns FD to userspace

Re-exports§

pub use blkdev_scheme::BlkDevScheme;
pub use fd::FileDescriptorTable;
pub use fd::STDERR;
pub use fd::STDIN;
pub use fd::STDOUT;
pub use file::OpenFile;
pub use mount::list_mounts;
pub use mount::mount;
pub use mount::resolve;
pub use mount::unmount;
pub use mount::Namespace;
pub use pipe::PipeScheme;
pub use procfs::ProcScheme;
pub use ramfs_scheme::RamfsScheme;
pub use scheme::DirEntry;
pub use scheme::DynScheme;
pub use scheme::FileFlags;
pub use scheme::IpcScheme;
pub use scheme::KernelScheme;
pub use scheme::Scheme;
pub use scheme_router::get_initfs_file_bytes;
pub use scheme_router::init_builtin_schemes;
pub use scheme_router::list_schemes;
pub use scheme_router::mount_scheme;
pub use scheme_router::register_initfs_file;
pub use scheme_router::register_scheme;

Modules§

blkdev_scheme: Block-device scheme : exposes raw disk devices under /dev.
console_scheme
fd: File Descriptor Table (per-process).
file: Open file state.
ipcfs
mount: Mount table and path resolution.
pipe: Kernel pipe implementation.
procfs: Procfs - process filesystem (similar to Linux & BSD /proc)
pty_scheme: Pseudo-terminal (PTY) scheme.
ramfs_scheme: In-kernel RAM filesystem : mounts on / to provide a writable root.
scheme: Scheme abstraction - backends for VFS operations.
scheme_router: Scheme Router (SR) - central registry for all schemes.

Structs§

FileStat
OpenFlags: Strat9 ABI open flags passed via SYS_OPEN.

Constants§

AT_FDCWD: Base directory for *at() syscalls: use the process CWD.

Functions§

chmod: Change permission bits on a path.
close: Close a file descriptor.
create_background_stdin: Create a background stdin: a pipe read-end whose write end is immediately closed. Any read() on the returned file will return 0 (EOF) at once, preventing processes launched in the background from blocking on stdin or spinning on EBADF.
create_file: Create an empty regular file.
dup: Duplicate a file descriptor (POSIX dup).
dup2: Duplicate a file descriptor to a specific number (POSIX dup2).
fchmod: Change permission bits on an open fd.
fsize: Get file size.
fstat: fstat on an open file descriptor.
fstat_at: Stat a file relative to a directory FD.
fsync: Sync file to storage.
ftruncate: Truncate an open fd.
getdents: Read directory entries from an open directory fd.
init: Initialize the VFS with default mounts.
link: Create a hard link (must be within the same mount).
lseek: POSIX lseek on a file descriptor.
mkdir: Create a directory.
open: Open a file and return a file descriptor.
open_at: Open a file relative to a directory FD.
pipe: Create a pipe, returning (read_fd, write_fd).
read: Read from a file descriptor.
read_all: Read all remaining bytes from a file descriptor.
readlink: Read the target of a symbolic link.
rename: Rename a file or directory (must be within the same mount).
seek: Seek within a file.
stat_path: stat by path (opens, stats, closes).
symlink: Create a symbolic link.
sys_chdir: SYS_CHDIR (440): Change current working directory.
sys_chmod: SYS_CHMOD (452): Change file mode bits.
sys_close: Syscall handler for closing a file.
sys_dup: Syscall handler for dup.
sys_dup2: Syscall handler for dup2.
sys_fchdir: SYS_FCHDIR (441): Change cwd using an open file descriptor.
sys_fchmod: SYS_FCHMOD (453): Change file mode bits on open fd.
sys_fstat: Syscall handler for fstat.
sys_fstatat: SYS_FSTATAT (463): Stat a file relative to a directory FD.
sys_ftruncate: SYS_FTRUNCATE (455): Truncate open fd to given length.
sys_getcwd: SYS_GETCWD (442): Write the current working directory into a user buffer.
sys_getdents: Syscall handler for getdents.
sys_ioctl: SYS_IOCTL (443): I/O control : stub.
sys_link: SYS_LINK (449): Create a hard link.
sys_lseek: Syscall handler for lseek.
sys_mkdir: SYS_MKDIR (447): Create a directory.
sys_open: Syscall handler for opening a file.
sys_openat: SYS_OPENAT (462): Open a file relative to a directory FD.
sys_pipe: Syscall handler for pipe.
sys_pread: SYS_PREAD (456): Read at offset without changing fd position.
sys_pwrite: SYS_PWRITE (457): Write at offset without changing fd position.
sys_read: Syscall handler for reading from a file.
sys_readlink: SYS_READLINK (451): Read a symbolic link.
sys_rename: SYS_RENAME (448): Rename a file or directory.
sys_rmdir: SYS_RMDIR (446): Remove an empty directory.
sys_stat: Syscall handler for stat (by path).
sys_symlink: SYS_SYMLINK (450): Create a symbolic link.
sys_truncate: SYS_TRUNCATE (454): Truncate file to given length.
sys_umask: SYS_UMASK (444): Set file creation mask; return the old mask.
sys_unlink: SYS_UNLINK (445): Remove a file.
sys_write: Syscall handler for writing to a file.
tell: Get current offset in a file.
truncate: Truncate a file by path.
unlink: Remove a file or directory.
write: Write to a file descriptor.

Module vfs

Module vfs Copy item path

§Architecture

Re-exports§

Modules§

Structs§

Constants§

Functions§

Module vfs