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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/include/kernel/mm.h
+3 -2
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@@ -99,10 +99,11 @@ void mm_init();
extern size_t mm_cache_cached_pages;
// the mm_cache_* functions that take a vnode NEED it to be taken from a source which is not from the page_t itself
#define MM_CACHE_GET_PAGE_FLAGS_NO_POPULATE 1
int mm_cache_get_page(vnode_t *vnode, uintmax_t offset, int flags, page_t **res);
int mm_cache_take_page(page_t *page);
void mm_cache_make_dirty(page_t *page);
void mm_cache_take_page(page_t *page);
void mm_cache_make_dirty(vnode_t *vnode, page_t *page);
int mm_cache_truncate(vnode_t *vnode, uintmax_t offset);
int mm_cache_sync_vnode(vnode_t *vnode);
int mm_cache_sync(void);
kernel-src/include/kernel/page.h
+2
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@@ -18,6 +18,7 @@
#define PAGE_FLAGS_READY 16
#define PAGE_FLAGS_ERROR 32
#define PAGE_FLAGS_SYNCING 64
#define PAGE_FLAGS_RECLAIMING 128
typedef struct page_t {
struct vnode_t *backing;
@@ -47,6 +48,7 @@ void mm_page_init();
void mm_get_page_statistics(size_t *total_pages, size_t *free_pages);
void mm_unlock_page(page_t *page);
bool mm_is_page_locked(page_t *page);
void mm_make_page_anonymous(page_t *page);
extern uintptr_t hhdm_base;
kernel-src/include/kernel/vfs.h
+4
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@@ -147,6 +147,8 @@ typedef struct vnode_t {
pushlock_t pages_lock;
trie_t pages;
size_t page_reclaim_handoffs;
eventheader_t zero_reclaim_event;
mutex_t adv_mutex;
advlock_t *advlock;
@@ -222,6 +224,8 @@ typedef struct vops_t {
(vn)->vfsmounted = NULL; \
trie_init(&(vn)->pages); \
(vn)->pages_lock = 0; \
(vn)->page_reclaim_handoffs = 0; \
EVENT_INITHEADER(&(vn)->zero_reclaim_event); \
MUTEX_INIT(&(vn)->writeback_mutex); \
MUTEX_INIT(&(vn)->dirty_list_mutex); \
(vn)->dirty = false; \