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page cache: proper truncation

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Matheus
2026-08-20 22:36:38 -03:00
parent 31f9ae17cf
commit 7217a1e258
9 changed files with 170 additions and 58 deletions
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kernel-src/mm/writeback.c
+7 -4
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@@ -16,12 +16,15 @@ static bool writer_syncing;
static eventheader_t writer_wakeup_event;
static eventheader_t sync_complete_event;
// OK
void mm_cache_make_dirty(page_t *page) {
vnode_t *vnode = page->backing;
void mm_cache_make_dirty(vnode_t *vnode, page_t *page) {
// check this here as a fast-path to reduce the mutex contention
int flags = __atomic_load_n(&page->flags, __ATOMIC_ACQUIRE);
if (flags & PAGE_FLAGS_TRUNCATED)
return;
MUTEX_ACQUIRE(&vnode->dirty_list_mutex);
int flags = __atomic_load_n(&page->flags, __ATOMIC_RELAXED);
flags = __atomic_load_n(&page->flags, __ATOMIC_RELAXED);
for (;;) {
if (flags & PAGE_FLAGS_TRUNCATED) {
MUTEX_RELEASE(&vnode->dirty_list_mutex);