DirEntryOps

starnix_core::vfs

Trait DirEntryOps 

Source 
pub trait DirEntryOps:
    Send
    + Sync
    + 'static {
    // Provided method
    fn revalidate(
        &self,
        _locked: &mut Locked<FileOpsCore>,
        _: &CurrentTask,
        _: &DirEntry,
    ) -> Result<bool, Errno> { ... }
}

Provided Methods§

Source

fn revalidate( &self, _locked: &mut Locked<FileOpsCore>, _: &CurrentTask, _: &DirEntry, ) -> Result<bool, Errno>

Revalidate the DirEntry, if needed.

Most filesystems don’t need to do any revalidations because they are “local” and all changes to nodes go through the kernel. However some filesystems allow changes to happen through other means (e.g. NFS, FUSE) and these filesystems need a way to let the kernel know it may need to refresh its cached metadata. This method provides that hook for such filesystems.

For more details, see:

  • https://www.halolinux.us/kernel-reference/the-dentry-cache.html
  • https://www.kernel.org/doc/html/latest/filesystems/path-lookup.html#revalidation-and-automounts
  • https://lwn.net/Articles/649115/
  • https://www.infradead.org/~mchehab/kernel_docs/filesystems/path-walking.html

Returns Ok(valid) where valid indicates if the DirEntry is still valid, or an error.

Implementors§