create and mkdir funcs

file and directory creation functions for both the vfs and tmpfs
2026-10-30 05:58:22 +00:00 · 2022-08-03 22:05:11 -03:00
parent 2419b2e9e0
commit 6ae75a9e99
4 changed files with 124 additions and 22 deletions
@@ -1,28 +1,75 @@
 #include <kernel/tmpfs.h>
 #include <kernel/vfs.h>
 #include <kernel/alloc.h>
+#include <arch/mmu.h>

-static int tmpfs_mount(dirnode_t** rootptr, vnode_t* device, int mountflags, void* fsinfo){
+static int tmpfs_mount(dirnode_t* mountpoint, vnode_t* device, int mountflags, void* fsinfo){
 	
 	fs_t* desc = alloc(sizeof(fs_t));
 	
 	if(!desc)
 		return ENOMEM;

-	dirnode_t* root = vfs_newdirnode(desc, NULL);
+	dirnode_t* root = vfs_newdirnode(mountpoint->vnode.name, desc, NULL);

 	if(!root){
 		free(desc);
 		return ENOMEM;
 	}
 	
-	*rootptr = root;
+	desc->calls = tmpfs_getfuncs();
+	mountpoint->mount = root;
+
+	return 0;
+}
+
+static int tmpfs_unmount(fs_t* fs) UNIMPLEMENTED
+static int tmpfs_open(dirnode_t* parent, char* name) UNIMPLEMENTED
+static int tmpfs_close(vnode_t* node) UNIMPLEMENTED
+
+static int tmpfs_mkdir(dirnode_t* parent, char* name, mode_t mode){
 	
+	dirnode_t* node = vfs_newdirnode(name, parent->vnode.fs, NULL);
+	
+	if(!node) 
+		return ENOMEM;
+
+	if(!hashtable_insert(&parent->children, name, node)){
+		vfs_destroynode(node);
+		return ENOMEM;
+	}
+	
+	node->vnode.parent = parent;	
+	stat* st = &node->vnode.st;
+	st->st_mode = MAKETYPE(TYPE_DIR) | GETMODE(mode);
+	st->st_blksize = PAGE_SIZE;
+
+	return 0;
+	
+}
+
+static int tmpfs_create(dirnode_t* parent, char* name, mode_t mode){
+	
+	vnode_t* node = vfs_newnode(name, parent->vnode.fs, NULL);
+	
+	if(!node)
+		return ENOMEM;
+	
+	if(!hashtable_insert(&parent->children, name, node)){
+		vfs_destroynode(node);
+		return ENOMEM;
+	}
+	
+	node->parent = parent;
+	stat* st = &node->st;
+	st->st_mode = MAKETYPE(TYPE_DIR) | GETMODE(mode);
+	st->st_blksize = PAGE_SIZE;
+
 	return 0;
 }

 static fscalls_t funcs = {
-	tmpfs_mount
+	tmpfs_mount, tmpfs_unmount, tmpfs_open, tmpfs_close, tmpfs_mkdir, tmpfs_create
 };


@@ -14,6 +14,50 @@ static inline dirnode_t* mountpoint(dirnode_t* node){
 	return ret;
 }

+int vfs_create(dirnode_t* ref, char* path, mode_t mode){
+	
+	dirnode_t* parent = NULL;
+	dirnode_t* buff   = NULL;
+
+	char name[512];
+
+	int result = vfs_resolvepath(&buff, &parent, ref, path, name);
+
+	if(!parent)
+		return result;
+
+	if(buff)
+		return EEXIST;
+
+	result = parent->vnode.fs->calls->create(parent, name, NULL);
+	
+	if(result) return result;
+	
+	return 0;
+}
+
+int vfs_mkdir(dirnode_t* ref, char* path, mode_t mode){
+	
+	dirnode_t* parent = NULL;
+	dirnode_t* buff = NULL;
+
+	char name[512];
+
+	int result = vfs_resolvepath(&buff, &parent, ref, path, name);
+
+	if(!parent)
+		return result;
+
+	if(buff)
+		return EEXIST;
+
+	result = parent->vnode.fs->calls->mkdir(parent, name, NULL);
+	
+	if(result) return result;
+	
+	return 0;
+}
+
 int vfs_mount(dirnode_t* ref, char* device, char* mountpoint, char* fs, int mountflags, void* fsinfo){
 	
 	fscalls_t* fscalls = hashtable_get(&fsfuncs, fs);
@@ -23,11 +67,12 @@ int vfs_mount(dirnode_t* ref, char* device, char* mountpoint, char* fs, int moun

 	vnode_t* dev = NULL;
 	dirnode_t* mountdir = ref;
+	dirnode_t* parent;

 	if(device){
 		dev = ref;
 		if(*device){
-			int result = vfs_resolvepath(&dev, ref, device);
+			int result = vfs_resolvepath(&dev, &parent, ref, device, NULL);
 			
 			if(result)
 				return result;
@@ -35,7 +80,7 @@ int vfs_mount(dirnode_t* ref, char* device, char* mountpoint, char* fs, int moun
 	}


-	int result = vfs_resolvepath(&mountdir, ref, mountpoint);
+	int result = vfs_resolvepath(&mountdir, &parent, ref, mountpoint, NULL);
 	
 	if(result)
 		return result;
@@ -43,16 +88,9 @@ int vfs_mount(dirnode_t* ref, char* device, char* mountpoint, char* fs, int moun
 	if(GETTYPE(mountdir->vnode.st.st_mode) != TYPE_DIR)
 		return ENOTDIR;

-	dirnode_t* mount;
-	
-	result = fscalls->mount(&mount, dev, mountflags, fsinfo);
+	result = fscalls->mount(mountdir, dev, mountflags, fsinfo);

-	if(result)
-		return result;
-
-	mountdir->mount = mount;
-
-	return 0;
+	return result;
 }

 vnode_t* vfs_newnode(char* name, fs_t* fs, void* fsdata){
@@ -100,7 +138,7 @@ dirnode_t* vfs_newdirnode(char* name, fs_t* fs, void* fsdata){

 }

-int vfs_resolvepath(vnode_t** result, dirnode_t* ref, char *path){
+int vfs_resolvepath(vnode_t** result, dirnode_t** resultparent, dirnode_t* ref, char *path, char* namebuff){
 	
 	dirnode_t* iterator = ref;
 	char name[512];
@@ -114,10 +152,13 @@ int vfs_resolvepath(vnode_t** result, dirnode_t* ref, char *path){
 		
 		size_t offset = 0;

+		while(path[nameoffset] == '/')
+			++nameoffset;
+
 		while(path[nameoffset] && path[nameoffset] != '/')
 			name[offset++] = path[nameoffset++];
-
-		if(path[nameoffset] == '/')
+	
+		while(path[nameoffset] == '/')
 			++nameoffset;

 		name[offset] = 0;
@@ -132,14 +173,20 @@ int vfs_resolvepath(vnode_t** result, dirnode_t* ref, char *path){
 		iterator = mountpoint(iterator);

 		// now try to get the right child
-
+		
 		vnode_t* child = hashtable_get(&iterator->children, name);

 		if(!child){
 			// open it
 			int status = iterator->vnode.fs->calls->open(iterator, name);
-			if(status)
+			if(status){
+				if(!path[nameoffset]){
+					if(namebuff)
+						strcpy(namebuff, name);
+					*resultparent = iterator;
+				}
 				return status;
+			}

 			child = hashtable_get(&iterator->children, name);
 			
@@ -148,7 +195,11 @@ int vfs_resolvepath(vnode_t** result, dirnode_t* ref, char *path){
 		iterator = (dirnode_t*)child;

 	}
+	
+	if(namebuff)
+		strcpy(namebuff, name);

+	*resultparent = iterator->vnode.parent;
 	*result = (vnode_t*)iterator;

 	return 0;
@@ -5,5 +5,7 @@
 #define ENODEV  2
 #define ENOMEM  3
 #define EINVAL  4
+#define ENOSYS  5
+#define EEXIST  6

 #endif
@@ -37,7 +37,7 @@ typedef struct _dirnode_t{

 typedef struct _fscalls_t {
 	// prepares the filesystem using a filesystem data pointer and device, returning the root node in rootptr
-	int (*mount)(dirnode_t** rootptr, vnode_t* device, int mountflags, void* fsinfo);
+	int (*mount)(dirnode_t* mountpoint, vnode_t* device, int mountflags, void* fsinfo);
 	// cleanup of the filesystem
 	int	 (*umount)(fs_t* fs);
 	//	 opens a file under a dirnode
@@ -70,6 +70,8 @@ void vfs_releasenode(vnode_t* node);
 vnode_t* vfs_newnode(char* name, fs_t* fs, void* fsdata);
 dirnode_t* vfs_newdirnode(char* name, fs_t* fs, void* fsdata);
 void vfs_destroynode(vnode_t* node);
-int  vfs_resolvepath(vnode_t** result, dirnode_t* ref, char* path);
+int  vfs_resolvepath(vnode_t** result, dirnode_t** parent, dirnode_t* ref, char* path, char* name);
+
+#define UNIMPLEMENTED { return ENOSYS; }

 #endif