feat: ability to evict dnode and inode cache

[lunaix-os.git] / lunaix-os / kernel / fs / twifs / twifs.c

diff --git a/lunaix-os/kernel/fs/twifs/twifs.c b/lunaix-os/kernel/fs/twifs/twifs.c
index e3abe4b4c2a682577effbfd965c06ea15f318a91..a40340f6eedf85594b709a47d570dd57e3968796 100644 (file)
--- a/lunaix-os/kernel/fs/twifs/twifs.c
+++ b/lunaix-os/kernel/fs/twifs/twifs.c
@@ -19,6 +19,8 @@ static struct twifs_node* fs_root;
 
 static struct cake_pile* twi_pile;
 
+static volatile int32_t inode_id = 0;
+
 int
 __twifs_dirlookup(struct v_inode* inode, struct v_dnode* dnode);
 
@@ -32,7 +34,7 @@ struct v_inode*
 __twifs_create_inode(struct twifs_node* twi_node);
 
 int
-__twifs_iterate_dir(struct v_file* file, struct dir_context* dctx);
+__twifs_iterate_dir(struct v_inode* inode, struct dir_context* dctx);
 
 int
 __twifs_mount(struct v_superblock* vsb, struct v_dnode* mount_point);
@@ -41,7 +43,13 @@ int
 __twifs_mkdir(struct v_inode* inode, struct v_dnode* dnode);
 
 int
-__twifs_rmstuff(struct v_inode* inode);
+__twifs_rmstuff(struct v_inode* inode, struct v_dnode* dir);
+
+int
+__twifs_fwrite(struct v_inode* inode, void* buffer, size_t len, size_t fpos);
+
+int
+__twifs_fread(struct v_inode* inode, void* buffer, size_t len, size_t fpos);
 
 void
 twifs_init()
@@ -52,19 +60,24 @@ twifs_init()
     twifs->fs_name = HSTR("twifs", 5);
     twifs->mount = __twifs_mount;
     twifs->types = FSTYPE_ROFS;
+    twifs->fs_id = 0;
 
     fsm_register(twifs);
 
-    fs_root = twifs_dir_node(NULL, NULL, 0);
+    fs_root = twifs_dir_node(NULL, NULL, 0, 0);
 }
 
 struct twifs_node*
-__twifs_new_node(struct twifs_node* parent, const char* name, int name_len)
+__twifs_new_node(struct twifs_node* parent,
+                 const char* name,
+                 int name_len,
+                 uint32_t itype)
 {
     struct twifs_node* node = cake_grab(twi_pile);
     memset(node, 0, sizeof(*node));
 
     node->name = HSTR(name, name_len);
+    node->itype = itype;
     hstr_rehash(&node->name, HSTR_FULL_HASH);
     llist_init_head(&node->children);
 
@@ -78,20 +91,22 @@ __twifs_new_node(struct twifs_node* parent, const char* name, int name_len)
 int
 twifs_rm_node(struct twifs_node* node)
 {
-    if ((node->itype & VFS_INODE_TYPE_DIR) && !llist_empty(&node->children)) {
+    if ((node->itype & VFS_IFDIR) && !llist_empty(&node->children)) {
         return ENOTEMPTY;
     }
     llist_delete(&node->siblings);
-    vfs_i_free(node->inode);
     cake_release(twi_pile, node);
     return 0;
 }
 
 struct twifs_node*
-twifs_file_node(struct twifs_node* parent, const char* name, int name_len)
+twifs_file_node(struct twifs_node* parent,
+                const char* name,
+                int name_len,
+                uint32_t itype)
 {
-    struct twifs_node* twi_node = __twifs_new_node(parent, name, name_len);
-    twi_node->itype = VFS_INODE_TYPE_FILE;
+    struct twifs_node* twi_node =
+      __twifs_new_node(parent, name, name_len, VFS_IFFILE | itype);
 
     struct v_inode* twi_inode = __twifs_create_inode(twi_node);
     twi_node->inode = twi_inode;
@@ -100,7 +115,10 @@ twifs_file_node(struct twifs_node* parent, const char* name, int name_len)
 }
 
 struct twifs_node*
-twifs_dir_node(struct twifs_node* parent, const char* name, int name_len)
+twifs_dir_node(struct twifs_node* parent,
+               const char* name,
+               int name_len,
+               uint32_t itype)
 {
     struct hstr hname = HSTR(name, name_len);
     hstr_rehash(&hname, HSTR_FULL_HASH);
@@ -109,63 +127,77 @@ twifs_dir_node(struct twifs_node* parent, const char* name, int name_len)
         return node;
     }
 
-    struct twifs_node* twi_node = __twifs_new_node(parent, name, name_len);
-    twi_node->itype = VFS_INODE_TYPE_DIR;
+    struct twifs_node* twi_node =
+      __twifs_new_node(parent, name, name_len, VFS_IFDIR | itype);
 
     struct v_inode* twi_inode = __twifs_create_inode(twi_node);
-    twi_node->fops.readdir = __twifs_iterate_dir;
     twi_node->inode = twi_inode;
 
     return twi_node;
 }
 
 struct twifs_node*
-twifs_toplevel_node(const char* name, int name_len)
+twifs_toplevel_node(const char* name, int name_len, uint32_t itype)
 {
-    return twifs_dir_node(fs_root, name, name_len);
+    return twifs_dir_node(fs_root, name, name_len, itype);
 }
 
 int
 __twifs_mkdir(struct v_inode* inode, struct v_dnode* dnode)
 {
-    struct twifs_node* parent_node = (struct twifs_node*)inode->data;
-    if (!(parent_node->itype & VFS_INODE_TYPE_DIR)) {
-        return ENOTDIR;
-    }
-    struct twifs_node* new_node =
-      twifs_dir_node(parent_node, dnode->name.value, dnode->name.len);
-    dnode->inode = new_node->inode;
-
-    return 0;
+    return ENOTSUP;
 }
 
 int
 __twifs_mount(struct v_superblock* vsb, struct v_dnode* mount_point)
 {
-    mount_point->inode = fs_root->inode;
+    vfs_assign_inode(mount_point, fs_root->inode);
     return 0;
 }
 
 struct v_inode*
 __twifs_create_inode(struct twifs_node* twi_node)
 {
-    struct v_inode* inode = vfs_i_alloc();
-    *inode = (struct v_inode){ .ctime = 0,
-                               .itype = twi_node->itype,
-                               .lb_addr = 0,
-                               .lb_usage = 0,
-                               .data = twi_node,
-                               .mtime = 0,
-                               .open_count = 0 };
+    struct v_inode* inode = vfs_i_alloc(1, inode_id++);
+    inode->itype = twi_node->itype;
+    inode->data = twi_node;
+
+    inode->ctime = clock_unixtime();
+    inode->atime = inode->ctime;
+    inode->mtime = inode->ctime;
+
     inode->ops.dir_lookup = __twifs_dirlookup;
     inode->ops.mkdir = __twifs_mkdir;
-    inode->ops.unlink = __twifs_rmstuff;
     inode->ops.rmdir = __twifs_rmstuff;
     inode->ops.open = __twifs_openfile;
 
+    inode->default_fops = (struct v_file_ops){ .read = __twifs_fread,
+                                               .write = __twifs_fwrite,
+                                               .readdir = __twifs_iterate_dir };
+
     return inode;
 }
 
+int
+__twifs_fwrite(struct v_inode* inode, void* buffer, size_t len, size_t fpos)
+{
+    struct twifs_node* twi_node = (struct twifs_node*)inode->data;
+    if (!twi_node || !twi_node->ops.write) {
+        return ENOTSUP;
+    }
+    return twi_node->ops.write(inode, buffer, len, fpos);
+}
+
+int
+__twifs_fread(struct v_inode* inode, void* buffer, size_t len, size_t fpos)
+{
+    struct twifs_node* twi_node = (struct twifs_node*)inode->data;
+    if (!twi_node || !twi_node->ops.read) {
+        return ENOTSUP;
+    }
+    return twi_node->ops.read(inode, buffer, len, fpos);
+}
+
 struct twifs_node*
 __twifs_get_node(struct twifs_node* parent, struct hstr* name)
 {
@@ -183,10 +215,9 @@ __twifs_get_node(struct twifs_node* parent, struct hstr* name)
 }
 
 int
-__twifs_rmstuff(struct v_inode* inode)
+__twifs_rmstuff(struct v_inode* inode, struct v_dnode* dir)
 {
-    struct twifs_node* twi_node = (struct twifs_node*)inode->data;
-    return twifs_rm_node(twi_node);
+    return ENOTSUP;
 }
 
 int
@@ -194,22 +225,22 @@ __twifs_dirlookup(struct v_inode* inode, struct v_dnode* dnode)
 {
     struct twifs_node* twi_node = (struct twifs_node*)inode->data;
 
-    if (!(twi_node->itype & VFS_INODE_TYPE_DIR)) {
+    if (!(twi_node->itype & VFS_IFDIR)) {
         return ENOTDIR;
     }
 
     struct twifs_node* child_node = __twifs_get_node(twi_node, &dnode->name);
     if (child_node) {
-        dnode->inode = child_node->inode;
+        vfs_assign_inode(dnode, child_node->inode);
         return 0;
     }
     return ENOENT;
 }
 
 int
-__twifs_iterate_dir(struct v_file* file, struct dir_context* dctx)
+__twifs_iterate_dir(struct v_inode* inode, struct dir_context* dctx)
 {
-    struct twifs_node* twi_node = (struct twifs_node*)(file->inode->data);
+    struct twifs_node* twi_node = (struct twifs_node*)(inode->data);
     int counter = 0;
     struct twifs_node *pos, *n;
 
@@ -231,8 +262,6 @@ __twifs_openfile(struct v_inode* inode, struct v_file* file)
 {
     struct twifs_node* twi_node = (struct twifs_node*)inode->data;
     if (twi_node) {
-        file->inode = twi_node->inode;
-        file->ops = twi_node->fops;
         return 0;
     }
     return ENOTSUP;