Add support for statfs and fstatfs

regression/syscall_test/Makefile

@@ -1,4 +1,4 @@
-TESTS ?= open_test read_test
+TESTS ?= open_test read_test statfs_test
 
 MKFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
 CUR_DIR := $(patsubst %/,%,$(dir $(MKFILE_PATH)))

regression/syscall_test/blocklists/statfs_test

@@ -0,0 +1,4 @@
+StatfsTest.InternalTmpfs
+StatfsTest.InternalDevShm
+FstatfsTest.InternalTmpfs
+FstatfsTest.InternalDevShm

services/libs/jinux-std/src/fs/fs_resolver.rs

@@ -262,7 +262,7 @@ impl FsResolver {
         let inode_handle = file_table
             .get_file(fd)?
             .downcast_ref::<InodeHandle>()
-            .ok_or(Error::with_message(Errno::EBADE, "not inode"))?;
+            .ok_or(Error::with_message(Errno::EBADF, "not inode"))?;
         Ok(inode_handle.dentry().clone())
     }
 
@@ -381,7 +381,7 @@ impl<'a> FsPath<'a> {
                 FsPathInner::CwdRelative(path)
             }
         } else {
-            return_errno_with_message!(Errno::EINVAL, "invalid dirfd number");
+            return_errno_with_message!(Errno::EBADF, "invalid dirfd number");
         };
 
         Ok(Self {

services/libs/jinux-std/src/fs/procfs/mod.rs

@@ -14,7 +14,7 @@ mod self_;
 mod template;
 
 /// Magic number.
-const PROC_MAGIC: usize = 0x9fa0;
+const PROC_MAGIC: u64 = 0x9fa0;
 /// Root Inode ID.
 const PROC_ROOT_INO: usize = 1;
 /// Block size.

services/libs/jinux-std/src/fs/ramfs/fs.rs

@@ -11,7 +11,7 @@ use super::*;
 use crate::fs::device::Device;
 use crate::fs::utils::{
     DirentVisitor, FileSystem, FsFlags, Inode, InodeMode, InodeType, IoEvents, IoctlCmd, Metadata,
-    Poller, SuperBlock,
+    Poller, SuperBlock, NAME_MAX,
 };
 
 /// A volatile file system whose data and metadata exists only in memory.

services/libs/jinux-std/src/fs/ramfs/mod.rs

@@ -4,7 +4,6 @@ pub use fs::RamFS;
 
 mod fs;
 
-const RAMFS_MAGIC: usize = 0x0102_1994;
+const RAMFS_MAGIC: u64 = 0x0102_1994;
 const BLOCK_SIZE: usize = 4096;
-const NAME_MAX: usize = 255;
 const ROOT_INO: usize = 1;

services/libs/jinux-std/src/fs/utils/dentry_cache.rs

@@ -4,7 +4,7 @@ use crate::prelude::*;
 use alloc::string::String;
 use core::time::Duration;
 
-use super::{InodeMode, InodeType, Metadata, Vnode, NAME_MAX};
+use super::{FileSystem, InodeMode, InodeType, Metadata, Vnode, NAME_MAX};
 
 lazy_static! {
     static ref DCACHE: Mutex<BTreeMap<DentryKey, Arc<Dentry>>> = Mutex::new(BTreeMap::new());
@@ -233,6 +233,11 @@ impl Dentry {
         Ok(())
     }
 
+    /// Get the filesystem the inode belongs to
+    pub fn fs(&self) -> Arc<dyn FileSystem> {
+        self.vnode.fs()
+    }
+
     /// Get the inode metadata
     pub fn inode_metadata(&self) -> Metadata {
         self.vnode.metadata()

services/libs/jinux-std/src/fs/utils/fs.rs

@@ -7,21 +7,21 @@ use crate::prelude::*;
 
 #[derive(Debug, Clone)]
 pub struct SuperBlock {
-    pub magic: usize,
+    pub magic: u64,
     pub bsize: usize,
     pub blocks: usize,
     pub bfree: usize,
     pub bavail: usize,
     pub files: usize,
     pub ffree: usize,
-    pub fsid: usize,
+    pub fsid: u64,
     pub namelen: usize,
     pub frsize: usize,
-    pub flags: usize,
+    pub flags: u64,
 }
 
 impl SuperBlock {
-    pub fn new(magic: usize, block_size: usize, name_len: usize) -> Self {
+    pub fn new(magic: u64, block_size: usize, name_max_len: usize) -> Self {
         Self {
             magic,
             bsize: block_size,
@@ -31,7 +31,7 @@ impl SuperBlock {
             files: 0,
             ffree: 0,
             fsid: 0,
-            namelen: 255,
+            namelen: name_max_len,
             frsize: block_size,
             flags: 0,
         }

services/libs/jinux-std/src/fs/utils/vnode.rs

@@ -1,6 +1,6 @@
 use super::{
-    DirentVisitor, FsFlags, Inode, InodeMode, InodeType, IoEvents, IoctlCmd, Metadata, PageCache,
+    DirentVisitor, FileSystem, FsFlags, Inode, InodeMode, InodeType, IoEvents, IoctlCmd, Metadata,
-    Poller,
+    PageCache, Poller,
 };
 use crate::fs::device::Device;
 use crate::prelude::*;
@@ -202,6 +202,10 @@ impl Vnode {
         self.inner.read().inode.ioctl(cmd, arg)
     }
 
+    pub fn fs(&self) -> Arc<dyn FileSystem> {
+        self.inner.read().inode.fs()
+    }
+
     pub fn metadata(&self) -> Metadata {
         self.inner.read().inode.metadata()
     }

services/libs/jinux-std/src/syscall/chdir.rs

@@ -41,7 +41,7 @@ pub fn sys_fchdir(fd: FileDescripter) -> Result<SyscallReturn> {
         let file = file_table.get_file(fd)?;
         let inode_handle = file
             .downcast_ref::<InodeHandle>()
-            .ok_or(Error::with_message(Errno::EBADE, "not inode"))?;
+            .ok_or(Error::with_message(Errno::EBADF, "not inode"))?;
         inode_handle.dentry().clone()
     };
     if dentry.inode_type() != InodeType::Dir {

services/libs/jinux-std/src/syscall/getdents64.rs

@@ -29,7 +29,7 @@ pub fn sys_getdents64(
     };
     let inode_handle = file
         .downcast_ref::<InodeHandle>()
-        .ok_or(Error::with_message(Errno::EBADE, "not inode"))?;
+        .ok_or(Error::with_message(Errno::EBADF, "not inode"))?;
     if inode_handle.dentry().inode_type() != InodeType::Dir {
         return_errno!(Errno::ENOTDIR);
     }

services/libs/jinux-std/src/syscall/mod.rs

@@ -56,6 +56,7 @@ use crate::syscall::set_robust_list::sys_set_robust_list;
 use crate::syscall::set_tid_address::sys_set_tid_address;
 use crate::syscall::setpgid::sys_setpgid;
 use crate::syscall::stat::{sys_fstat, sys_fstatat, sys_lstat, sys_stat};
+use crate::syscall::statfs::{sys_fstatfs, sys_statfs};
 use crate::syscall::symlink::{sys_symlink, sys_symlinkat};
 use crate::syscall::tgkill::sys_tgkill;
 use crate::syscall::time::sys_time;
@@ -150,6 +151,7 @@ mod setsockopt;
 mod shutdown;
 mod socket;
 mod stat;
+mod statfs;
 mod symlink;
 mod tgkill;
 mod time;
@@ -259,6 +261,8 @@ define_syscall_nums!(
     SYS_SETPGID = 109,
     SYS_GETPPID = 110,
     SYS_GETPGRP = 111,
+    SYS_STATFS = 137,
+    SYS_FSTATFS = 138,
     SYS_PRCTL = 157,
     SYS_ARCH_PRCTL = 158,
     SYS_GETTID = 186,
@@ -411,6 +415,8 @@ pub fn syscall_dispatch(
         SYS_SETPGID => syscall_handler!(2, sys_setpgid, args),
         SYS_GETPPID => syscall_handler!(0, sys_getppid),
         SYS_GETPGRP => syscall_handler!(0, sys_getpgrp),
+        SYS_STATFS => syscall_handler!(2, sys_statfs, args),
+        SYS_FSTATFS => syscall_handler!(2, sys_fstatfs, args),
         SYS_PRCTL => syscall_handler!(5, sys_prctl, args),
         SYS_ARCH_PRCTL => syscall_handler!(2, sys_arch_prctl, args, context),
         SYS_GETTID => syscall_handler!(0, sys_gettid),

services/libs/jinux-std/src/syscall/statfs.rs

@@ -0,0 +1,93 @@
+use crate::fs::{
+    file_table::FileDescripter,
+    fs_resolver::FsPath,
+    inode_handle::InodeHandle,
+    utils::{SuperBlock, PATH_MAX},
+};
+use crate::log_syscall_entry;
+use crate::prelude::*;
+use crate::util::{read_cstring_from_user, write_val_to_user};
+
+use super::SyscallReturn;
+use super::{SYS_FSTATFS, SYS_STATFS};
+
+pub fn sys_statfs(path_ptr: Vaddr, statfs_buf_ptr: Vaddr) -> Result<SyscallReturn> {
+    log_syscall_entry!(SYS_STATFS);
+    let path = read_cstring_from_user(path_ptr, PATH_MAX)?;
+    debug!("path = {:?}, statfs_buf_ptr = 0x{:x}", path, statfs_buf_ptr,);
+
+    let current = current!();
+    let dentry = {
+        let path = path.to_string_lossy();
+        let fs_path = FsPath::try_from(path.as_ref())?;
+        current.fs().read().lookup(&fs_path)?
+    };
+    let statfs = Statfs::from(dentry.fs().sb());
+    write_val_to_user(statfs_buf_ptr, &statfs)?;
+    Ok(SyscallReturn::Return(0))
+}
+
+pub fn sys_fstatfs(fd: FileDescripter, statfs_buf_ptr: Vaddr) -> Result<SyscallReturn> {
+    log_syscall_entry!(SYS_FSTATFS);
+    debug!("fd = {}, statfs_buf_addr = 0x{:x}", fd, statfs_buf_ptr);
+
+    let current = current!();
+    let file_table = current.file_table().lock();
+    let file = file_table.get_file(fd)?;
+    let inode_handle = file
+        .downcast_ref::<InodeHandle>()
+        .ok_or(Error::with_message(Errno::EBADF, "not inode"))?;
+    let dentry = inode_handle.dentry();
+    let statfs = Statfs::from(dentry.fs().sb());
+    write_val_to_user(statfs_buf_ptr, &statfs)?;
+    Ok(SyscallReturn::Return(0))
+}
+
+/// FS Stat
+#[derive(Debug, Clone, Copy, Pod, Default)]
+#[repr(C)]
+struct Statfs {
+    /// Type of filesystem
+    f_type: u64,
+    /// Optimal transfer block size
+    f_bsize: usize,
+    /// Total data blocks in filesystem
+    f_blocks: usize,
+    /// Free blocks in filesystem
+    f_bfree: usize,
+    /// Free blocks available to unprivileged user
+    f_bavail: usize,
+    /// Total inodes in filesystem
+    f_files: usize,
+    /// Free inodes in filesystem
+    f_ffree: usize,
+    /// Filesystem ID
+    f_fsid: u64,
+    /// Maximum length of filenames
+    f_namelen: usize,
+    /// Fragment size
+    f_frsize: usize,
+    /// Mount flags of filesystem
+    f_flags: u64,
+    /// Padding bytes reserved for future use
+    f_spare: [u64; 4],
+}
+
+impl From<SuperBlock> for Statfs {
+    fn from(sb: SuperBlock) -> Self {
+        Self {
+            f_type: sb.magic,
+            f_bsize: sb.bsize,
+            f_blocks: sb.blocks,
+            f_bfree: sb.bfree,
+            f_bavail: sb.bavail,
+            f_files: sb.files,
+            f_ffree: sb.ffree,
+            f_fsid: sb.fsid,
+            f_namelen: sb.namelen,
+            f_frsize: sb.frsize,
+            f_flags: sb.flags,
+            f_spare: [0u64; 4],
+        }
+    }
+}