RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 20:07:35 +00:00
Code Issues Activity Actions

Kernel: Fix race condition in TmpFSInode::notify_watchers()

Browse source 
We were doing this dance in notify_watchers():

    set_metadata_dirty(true);
    set_metadata_dirty(false);

This was done in order to force out inode watcher events immediately.
Unfortunately, this was racy, as if SyncTask got scheduled at the wrong
moment, it would try to flush metadata for a clean inode. This then got
trapped by the VERIFY() statement in Inode::sync_all():

    VERIFY(inode.is_metadata_dirty());

This patch fixes the issue by replacing notify_watchers() with lazy
metadata notifications like all other filesystems.
This commit is contained in:
Andreas Kling 2021-12-28 12:33:27 +01:00
parent b24dc84ad9
commit 416b0374fb
2 changed files with 7 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

1
Kernel/FileSystem/TmpFS.h
View file

@ -73,7 +73,6 @@ private:
TmpFSInode(TmpFS& fs, const InodeMetadata& metadata, InodeIdentifier parent);
static ErrorOr<NonnullRefPtr<TmpFSInode>> try_create(TmpFS&, InodeMetadata const& metadata, InodeIdentifier parent);
static ErrorOr<NonnullRefPtr<TmpFSInode>> try_create_root(TmpFS&);
void notify_watchers();
struct Child {
NonnullOwnPtr<KString> name;