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Code Issues Releases Wiki Activity

实现fat文件系统的truncate方法 (#428)

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MemoryShore 2023-11-08 21:42:51 +08:00 committed by GitHub
parent df2f5051ac
commit 04babc3fab
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2 changed files with 18 additions and 0 deletions
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11
kernel/src/filesystem/fat/fs.rs
View File

@ -1511,6 +1511,17 @@ impl IndexNode for LockedFATInode {
} }
} }
fn truncate(&self, len: usize) -> Result<(), SystemError> {
let guard: SpinLockGuard<FATInode> = self.0.lock();
let old_size = guard.metadata.size as usize;
if len < old_size {
drop(guard);
self.resize(len)
} else {
Ok(())
}
}
fn list(&self) -> Result<Vec<String>, SystemError> { fn list(&self) -> Result<Vec<String>, SystemError> {
let mut guard: SpinLockGuard<FATInode> = self.0.lock(); let mut guard: SpinLockGuard<FATInode> = self.0.lock();
let fatent: &FATDirEntry = &guard.inode_type; let fatent: &FATDirEntry = &guard.inode_type;

7
kernel/src/syscall/mod.rs
View File

@ -357,6 +357,8 @@ pub const SYS_IOCTL: usize = 16;
#[allow(dead_code)] #[allow(dead_code)]
pub const SYS_WRITEV: usize = 20; pub const SYS_WRITEV: usize = 20;
pub const SYS_MADVISE: usize = 28;
pub const SYS_DUP: usize = 32; pub const SYS_DUP: usize = 32;
pub const SYS_DUP2: usize = 33; pub const SYS_DUP2: usize = 33;
@ -1128,6 +1130,11 @@ impl Syscall {
Ok(0) Ok(0)
} }
SYS_MADVISE => {
kwarn!("SYS_MADVISE has not yet been implemented");
Ok(0)
}
_ => panic!("Unsupported syscall ID: {}", syscall_num), _ => panic!("Unsupported syscall ID: {}", syscall_num),
}; };
return r; return r;