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page cache rewrite

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Matheus
2026-07-28 16:33:55 -03:00
parent ad1740738b
commit 31f9ae17cf
17 changed files with 494 additions and 608 deletions
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kernel-src/fs/ext2.c
+4 -21
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@@ -1822,7 +1822,6 @@ static int ext2_getpage(vnode_t *node, uintmax_t offset, struct page_t *page) {
static int ext2_putpage(vnode_t *node, uintmax_t offset, struct page_t *page) {
// only regular files get cached
__assert(node->type == V_TYPE_REGULAR);
size_t writec;
iovec_t iovec = {
.addr = MAKE_HHDM(mm_get_page_address(page)),
.len = PAGE_SIZE
@@ -1830,21 +1829,8 @@ static int ext2_putpage(vnode_t *node, uintmax_t offset, struct page_t *page) {
iovec_iterator_t iovec_iterator;
iovec_iterator_init(&iovec_iterator, &iovec, 1);
int error = VOP_WRITE(node, &iovec_iterator, PAGE_SIZE, offset, 0, &writec, NULL);
// its possible that writec is zero here. the condition where this is possible is when
// the file is truncated after the check in the page sync function but before it actually is
// written back to disk. therefore, we check that the page IS infact truncated if this happens.
// if it isn't, something else happened and its not safe to continue.
//
// TODO: since this check will likely be copied between different filesystem drivers, it could be interesting to have
// ext2_putpage take in a (size_t *) pointer and have this check be in whatever function calls VOP_PUTPAGE.
if (writec == 0) {
__assert(page->flags & PAGE_FLAGS_TRUNCATED);
}
return error;
size_t writec;
return VOP_WRITE(node, &iovec_iterator, PAGE_SIZE, offset, 0, &writec, NULL);
}
static int ext2_rename(vnode_t *sourcedir, vnode_t *source, char *oldname, vnode_t *targetdir, char *newname, int flags) {
@@ -1964,13 +1950,11 @@ static int ext2_rename(vnode_t *sourcedir, vnode_t *source, char *oldname, vnode
}
static int ext2_sync(vnode_t *vnode) {
int e = mm_cache_sync_vnode(vnode, 0, UINT64_MAX);
int e = mm_cache_sync_vnode(vnode);
ext2fs_t *fs = (ext2fs_t *)vnode->vfs;
abc_sync(&fs->abc);
// TODO don't sync the entire disk but rather only the inodes and blocks
VOP_LOCK(fs->backing);
int e2 = mm_cache_sync_vnode(fs->backing, 0, UINT64_MAX);
VOP_UNLOCK(fs->backing);
int e2 = mm_cache_sync_vnode(fs->backing);
// only the first errors are reported
return e ? e : e2;
}
@@ -2007,7 +1991,6 @@ static int ext2_inactive(vnode_t *vnode) {
__assert(hashtable_remove(&fs->inodetable, &node->id, sizeof(node->id)) == 0);
MUTEX_RELEASE(&fs->inodetablelock);
mm_cache_truncate(vnode, 0);
freeinode(fs, &node->inode, node->id);
slab_free(nodecache, node);