nvrl/proton-drive-linux
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fix(core,fuse): a node written under its stand-in after landing updates its landed row

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nvrl committed 2026-10-04 13:38:54 +02:00
1 parent 9c93860cd8
commit dbc4d9a8c5
4 files changed
+66 -30
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crates/pdfs-fuse/src/lib.rs
+3 -24
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@@ -169,10 +169,6 @@ const DRAIN_BACKOFF_MAX: Duration = Duration::from_secs(300);
/// directly on a new write or a reconnect, so this only bounds how late a
/// backoff can fire.
const DRAIN_IDLE_POLL: Duration = Duration::from_secs(30);
/// How long a write whose create just landed waits for the drain to repoint
/// its inode (`Core::landed_uid`): 200 polls of 10 ms, two seconds in all.
const LANDED_UID_POLLS: u32 = 200;
const LANDED_UID_POLL: Duration = Duration::from_millis(10);
/// How long the mount waits before asking again for a node it has just created
/// when Drive does not list it yet (`Core::fetch_minted_node`).
const MINTED_READ_BACK_DELAYS: [Duration; 2] = [Duration::from_millis(250), Duration::from_secs(1)];
@@ -3430,9 +3426,9 @@ impl Core {
break 'queued attached.superseded;
}
drop(pending);
// The create landed while this handle was open. Its uid is the
// one the drain has just given the inode.
let Some(real) = self.landed_uid(ino) else {
// The create landed while this handle was open, and its row
// already has the uid Drive gave it.
let Some(real) = self.landed_row_uid(ino) else {
error!(%uid, staged = %path.display(),
"queued create vanished under a write; bytes kept in staging");
return Err(Errno::EIO);
@@ -3511,23 +3507,6 @@ impl Core {
Ok(())
}
/// The real uid the drain gave `ino` when its queued create landed.
///
/// Called by a write that found the create already retired. The drain
/// repoints the inode right after it drops `pending`, with no network in
/// between, so a short wait covers the gap; `None` means the inode is gone
/// or never stopped being a placeholder.
fn landed_uid(&self, ino: u64) -> Option<NodeUid> {
for _ in 0..LANDED_UID_POLLS {
let uid = self.state().entries.get(&ino).map(|e| e.uid.clone())?;
if !is_local_uid(&uid) {
return Some(uid);
}
std::thread::sleep(LANDED_UID_POLL);
}
None
}
/// Queue the new content of a path-based truncate — `> file`, or any
/// `setattr(size=…)` arriving without a write handle.
///