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vfs: finish new locking scheme

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Matheus
2024-08-27 21:02:12 -03:00
parent 8f6bc6c4c1
commit f55b51a06d
8 changed files with 168 additions and 128 deletions
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kernel-src/mm/vmmcache.c
+11 -5
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@@ -294,13 +294,19 @@ int vmmcache_truncate(vnode_t *vnode, uintmax_t offset) {
// called with lock held
// returns with lock released
// expects backing lock to be held
static int syncpage(page_t *page) {
static int syncpage(page_t *page, bool backinglock) {
__assert(page->flags & PAGE_FLAGS_DIRTY);
page->flags &= ~PAGE_FLAGS_DIRTY;
RELEASE_LOCK();
int e = 0;
if ((page->flags & PAGE_FLAGS_TRUNCATED) == 0) {
if (backinglock)
VOP_LOCK(page->backing);
e = VOP_PUTPAGE(page->backing, page->offset, (page_t *)page);
if (backinglock)
VOP_UNLOCK(page->backing);
VOP_RELEASE(page->backing);
} else {
// page got truncated from the file while waiting to be written to disk
@@ -355,7 +361,9 @@ int vmmcache_syncvnode(vnode_t *vnode, uintmax_t offset, size_t size) {
page_t *page = vnodedirtylist;
vnodedirtylist = vnodedirtylist->writenext;
page->writenext = NULL;
int error = syncpage(page);
int error = syncpage(page, false);
if (e == 0)
e = error;
// syncpage returns with lock released
@@ -441,9 +449,7 @@ static void writer() {
page->writenext = NULL;
// TODO notify error on vmmcache_syncvnode
VOP_LOCK(page->backing);
syncpage((page_t *)page);
VOP_UNLOCK(page->backing);
syncpage((page_t *)page, true);
}
}