nfs-rs 0.5.0

An asynchronous, pure Rust client library for NFSv3 and NFSv4.1
Documentation 
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use bytes::{Buf, Bytes};
use tracing::{debug, warn};

use super::compound::OpResponse;
use super::mount::{Mount41, decode_fh};
use crate::error::Result;
use crate::mount;
use crate::nfs4::attrs::{decode_getattr_response, encode_setattr, standard_getattr_bitmap};

/// Parse change_info4 from an operation result.
/// Returns (atomic, before_changeid, after_changeid).
fn parse_change_info(op: &OpResponse) -> Option<(bool, u64, u64)> {
    let mut data = op.data.clone();
    if data.remaining() < 20 {
        return None;
    }
    let atomic = data.get_u32() != 0;
    let before = data.get_u64();
    let after = data.get_u64();
    Some((atomic, before, after))
}

impl Mount41 {
    pub(crate) async fn remove(&self, dir_fh: Bytes, filename: &str) -> Result<()> {
        let resp = self
            .compound("remove", |b| b.putfh(&dir_fh).remove(filename))
            .await?;
        resp.op_ok(1)?; // PUTFH
        resp.op_ok(2)?; // REMOVE
        if let Some(remove_op) = resp.results.get(2)
            && let Some((atomic, before, after)) = parse_change_info(remove_op)
        {
            debug!(atomic, before, after, name = filename, "REMOVE change_info");
        }
        Ok(())
    }

    pub(crate) async fn remove_path(&self, path: &str) -> Result<()> {
        let (dir, name) = crate::split_path(path)?;
        let dir_obj = self.lookup_path(&dir).await?;
        self.remove(dir_obj.fh, &name).await
    }

    pub(crate) async fn rmdir(&self, dir_fh: Bytes, dirname: &str) -> Result<()> {
        // NFSv4 REMOVE works for both files and directories
        self.remove(dir_fh, dirname).await
    }

    pub(crate) async fn rmdir_path(&self, path: &str) -> Result<()> {
        self.remove_path(path).await
    }

    pub(crate) async fn rename(
        &self,
        from_dir_fh: Bytes,
        from_filename: &str,
        to_dir_fh: Bytes,
        to_filename: &str,
    ) -> Result<()> {
        // NFSv4 RENAME: PUTFH(src_dir) + SAVEFH + PUTFH(dst_dir) + RENAME(old, new)
        let resp = self
            .compound("rename", |b| {
                b.putfh(&from_dir_fh)
                    .savefh()
                    .putfh(&to_dir_fh)
                    .rename(from_filename, to_filename)
            })
            .await?;
        resp.op_ok(1)?; // PUTFH
        resp.op_ok(2)?; // SAVEFH
        resp.op_ok(3)?; // PUTFH
        resp.op_ok(4)?; // RENAME
        if let Some(rename_op) = resp.results.get(4) {
            let mut data = rename_op.data.clone();
            if data.remaining() >= 40 {
                let src_atomic = data.get_u32() != 0;
                let src_before = data.get_u64();
                let src_after = data.get_u64();
                let dst_atomic = data.get_u32() != 0;
                let dst_before = data.get_u64();
                let dst_after = data.get_u64();
                debug!(
                    src_atomic,
                    src_before,
                    src_after,
                    dst_atomic,
                    dst_before,
                    dst_after,
                    from = from_filename,
                    to = to_filename,
                    "RENAME change_info"
                );
            }
        }
        Ok(())
    }

    pub(crate) async fn rename_path(&self, from_path: &str, to_path: &str) -> Result<()> {
        let (from_dir, from_name) = crate::split_path(from_path)?;
        let (to_dir, to_name) = crate::split_path(to_path)?;
        let from_obj = self.lookup_path(&from_dir).await?;
        let to_obj = self.lookup_path(&to_dir).await?;
        self.rename(from_obj.fh, &from_name, to_obj.fh, &to_name)
            .await
    }

    pub(crate) async fn link(
        &self,
        src_fh: Bytes,
        dst_dir_fh: Bytes,
        dst_filename: &str,
    ) -> Result<mount::Attr> {
        // NFSv4 LINK: PUTFH(src) + SAVEFH + PUTFH(dst_dir) + LINK(newname)
        let bitmap = standard_getattr_bitmap();
        let resp = self
            .compound("link", |b| {
                b.putfh(&src_fh)
                    .savefh()
                    .putfh(&dst_dir_fh)
                    .link(dst_filename)
                    .putfh(&src_fh)
                    .getattr(&bitmap)
            })
            .await?;
        resp.op_ok(1)?; // PUTFH(src)
        resp.op_ok(2)?; // SAVEFH
        resp.op_ok(3)?; // PUTFH(dst_dir)
        resp.op_ok(4)?; // LINK
        if let Some(link_op) = resp.results.get(4)
            && let Some((atomic, before, after)) = parse_change_info(link_op)
        {
            debug!(
                atomic,
                before,
                after,
                name = dst_filename,
                "LINK change_info"
            );
        }
        resp.op_ok(5)?; // PUTFH(src) again for getattr
        let getattr = resp.op_ok(6)?;
        let mut data = getattr.data.clone();
        decode_getattr_response(&mut data)
    }

    pub(crate) async fn link_path(&self, src_path: &str, dst_path: &str) -> Result<mount::Attr> {
        let src_obj = self.lookup_path(src_path).await?;
        let (dst_dir, dst_name) = crate::split_path(dst_path)?;
        let dst_dir_obj = self.lookup_path(&dst_dir).await?;
        self.link(src_obj.fh, dst_dir_obj.fh, &dst_name).await
    }

    pub(crate) async fn symlink(
        &self,
        target: &str,
        dst_dir_fh: Bytes,
        dst_filename: &str,
    ) -> Result<mount::ObjRes> {
        // NFSv4 symlink: CREATE with NF4LNK type
        let bitmap = standard_getattr_bitmap();
        let resp = self
            .compound("symlink", |b| {
                b.putfh(&dst_dir_fh)
                    .create_symlink(dst_filename, target, &[], &[])
                    .getfh()
                    .getattr(&bitmap)
            })
            .await?;
        resp.op_ok(1)?; // PUTFH
        resp.op_ok(2)?; // CREATE(NF4LNK)
        let getfh = resp.op_ok(3)?;
        let mut fh_data = getfh.data.clone();
        let fh = decode_fh(&mut fh_data)?;
        let getattr = resp.op_ok(4)?;
        let mut attr_data = getattr.data.clone();
        let attr = decode_getattr_response(&mut attr_data)?;
        Ok(mount::ObjRes {
            fh,
            attr: Some(attr),
        })
    }

    pub(crate) async fn symlink_path(&self, target: &str, dst_path: &str) -> Result<mount::ObjRes> {
        let (dst_dir, dst_name) = crate::split_path(dst_path)?;
        let dst_dir_obj = self.lookup_path(&dst_dir).await?;
        self.symlink(target, dst_dir_obj.fh, &dst_name).await
    }

    /// CREATE(NF4LNK) 与 SETATTR 合并到单个 COMPOUND 的实现。
    ///
    /// 当 uid/gid/atime/mtime 至少一个 `Some` 时，向 COMPOUND 追加 SETATTR
    /// 与第二个 GETATTR，省一次 RPC 往返；全部为 `None` 时等价于 `symlink()`。
    /// SETATTR 走 anonymous stateid（all-zero），适用于非 file 对象（RFC 5661 §8.2.3）。
    /// 注意：mode 不参与 — symlink 的 POSIX mode 没有可移植语义，data-mover 调用方也不传。
    /// SETATTR 写入 createattrs 会触发部分服务端的 NFS4ERR_ATTRNOTSUPP，
    /// 因此沿用 mkdir/file create 的保守模式：CREATE 用空 attrs，SETATTR 紧随其后。
    /// 若服务端连 in-compound 的 SETATTR 都拒绝，内部用独立 SETATTR + GETATTR 兜底。
    #[allow(clippy::too_many_arguments)]
    pub(crate) async fn symlink_with_attrs(
        &self,
        target: &str,
        dst_dir_fh: Bytes,
        dst_filename: &str,
        uid: Option<u32>,
        gid: Option<u32>,
        atime: Option<crate::Time>,
        mtime: Option<crate::Time>,
    ) -> Result<mount::ObjRes> {
        let (setattr_mask, setattr_vals) = encode_setattr(None, uid, gid, None, atime, mtime);
        if setattr_mask.is_empty() {
            // 无属性要写：等价于旧 symlink，省去 SETATTR 这一 op
            return self.symlink(target, dst_dir_fh, dst_filename).await;
        }

        let bitmap = standard_getattr_bitmap();
        let stateid = [0u8; 16]; // anonymous stateid（RFC 5661 §8.2.3）
        let resp = self
            .compound("symlink_with_attrs", |b| {
                b.putfh(&dst_dir_fh)
                    .create_symlink(dst_filename, target, &[], &[])
                    .getfh()
                    .setattr(&stateid, &setattr_mask, &setattr_vals)
                    .getattr(&bitmap)
            })
            .await?;

        resp.op_ok(1)?; // PUTFH
        resp.op_ok(2)?; // CREATE(NF4LNK) — 此点之后 symlink 已落地
        let getfh = resp.op_ok(3)?;
        let mut fh_data = getfh.data.clone();
        let fh = decode_fh(&mut fh_data)?;

        // SETATTR 失败时 GETATTR 不会执行；symlink 已存在但属性是默认值。
        // 内部用独立 SETATTR + GETATTR 兜底，让上层看到的语义保持不变。
        if let Err(e) = resp.op_ok(4) {
            warn!(
                error = ?e,
                "symlink_with_attrs: in-compound SETATTR failed, falling back to separate SETATTR"
            );
            self.setattr(fh.clone(), None, None, uid, gid, None, atime, mtime)
                .await?;
            let attr = self.getattr(fh.clone()).await?;
            return Ok(mount::ObjRes {
                fh,
                attr: Some(attr),
            });
        }

        let getattr = resp.op_ok(5)?;
        let mut attr_data = getattr.data.clone();
        let attr = decode_getattr_response(&mut attr_data)?;
        Ok(mount::ObjRes {
            fh,
            attr: Some(attr),
        })
    }
}