Defined file abstraction, separated ramfs into system/ramfs.c

src/kernel/drivers/pci.c

@@ -45,6 +45,14 @@ void pci_read_file(vfile_t *file, uint32_t *buffer, uint32_t offset, uint32_t co
 void pci_write_file(vfile_t *file, uint32_t *buffer, uint32_t offset, uint32_t count){
     return;
 }
+
+fileops_t pci_fileops = {
+    0,
+    0,
+    pci_write_file,
+    pci_read_file,
+};
+
 void pci_make_file(uint32_t class, uint8_t bus, uint8_t slot, uint8_t func){
     char str[256] = "/dev/pci/\0";
     char *dev = classes[class >> 8][class & 0xf];
@@ -76,8 +84,9 @@ void pci_make_file(uint32_t class, uint8_t bus, uint8_t slot, uint8_t func){
         strcpy(str, cpy);
         strcpy(num, cpy + strlen(cpy));
         file = fcreate(cpy, 0);
-        file->read = pci_read_file;
-        file->write = pci_write_file;
+        // file->read = pci_read_file;
+        // file->write = pci_write_file;
+        file->fileops = &pci_fileops;
         if(tries >= 254){
             mlog(MODULE_NAME, "Failed to make PCI file for device!\n", MLOG_PRINT);
             return;

src/kernel/drivers/ustar.c

@@ -40,10 +40,10 @@ int read_initrd(initrd_t *initrd){
         if(!tmp){
             mlog("INITRD", "Failed to read critical boot file: %s\n", MLOG_PRINT, file->filename);
         }
-        if(tmp->ptr){
-            kfree(tmp->ptr);
+        if(tmp->private){
+            kfree(tmp->private);
         }
-        tmp->ptr = (archive + offset + sizeof(USTAR_file_t));
+        tmp->private = (archive + offset + sizeof(USTAR_file_t));
         tmp->size = fsize_pgs * 4096;
         // printf("%s, %d, %d\n", final_fname, filesize, fsize_pgs);
         offset += (((filesize + 511) / 512) + 1) * 512;

src/kernel/kmain.c

@@ -12,6 +12,7 @@
 #include "system/vfs.h"
 #include "drivers/ustar.h"
 #include "system/initrc.h"
+#include "system/ramfs.h"
 
 kernel_info_t *boot_info = 0;
 
@@ -49,7 +50,7 @@ void sysinit(){
 extern void kmain(kernel_info_t *kernel_info){
     serial_init();
     pm_init(kernel_info);
-    vfs_init();
+    ramfs_init();
     mlog("KERNEL", "Initializing IDT\n", MLOG_PRINT);
     idt_load();
     pic_init(0x20);

src/kernel/system/intirc.c

@@ -17,7 +17,7 @@ int is_num(char c){
 
 void initrc_read(vfile_t *file){
     mlog("KERNEL", "Reading initrc:\n", MLOG_PRINT);
-    char *ptr = file->ptr;
+    char *ptr = file->private;
     if(!file || !ptr){
         mlog("KERNEL", "Failed to read initrc!\n", MLOG_PRINT);
         return;
@@ -67,7 +67,7 @@ void initrc_read(vfile_t *file){
                 printf("Error: Could not find module in Initrc.conf: %s\n", module_name);
                 continue;
             }
-            module_start(module->ptr);
+            module_start(module->private);
         }
         else if(!strcmp(statement, "MOUNT")){
             char mount_src_name[512] = {0};

src/kernel/system/ramfs.c

@@ -0,0 +1,28 @@
+#include "vfs.h"
+#include "ramfs.h"
+#include "../shared/kstdlib.h"
+#include "../shared/memory.h"
+#include "../shared/string.h"
+#define MODULE_NAME "KVFS"
+
+
+fileops_t ramfs_ops = 
+{
+    ramfs_create,
+};
+
+vfile_t root_dir = {"/", FS_FILE_IS_DIR | FS_FILE_SYSTEM, &ramfs_ops};
+
+void ramfs_init(){
+    mlog(MODULE_NAME, "Initializing VFS\n", MLOG_PRINT);
+    root_dir.private = kmalloc(1);
+    root_dir.size = 4096;//one page is 4096 bytes
+}
+
+void ramfs_create(char *path, FS_FILE_FLAGS flags){
+    return 0;
+}
+
+vfile_t *get_root_dir(){
+    return &root_dir;
+}

src/kernel/system/ramfs.h

@@ -0,0 +1,6 @@
+#pragma once
+#include <stdint.h>
+
+void ramfs_init();
+void ramfs_create(char *path, FS_FILE_FLAGS flags);
+vfile_t *get_root_dir();

src/kernel/system/vfs.c

@@ -3,37 +3,32 @@
 #include "../shared/memory.h"
 #include "../shared/string.h"
 #define MODULE_NAME "KVFS"
-vfile_t root_dir = {"/", FS_FILE_IS_DIR | FS_FILE_SYSTEM};
 
 // !TODO: Modify code to become thread-safe
 
-void vfs_init(){
-    mlog(MODULE_NAME, "Initializing VFS\n", MLOG_PRINT);
-    root_dir.ptr = kmalloc(1);
-    root_dir.size = 4096;//one page is 4096 bytes
-}
 
 void add_file(vfile_t *vfile, vfile_t *current_dir){
     return;
 }
 
 vfile_t *fcreate(char *path, FS_FILE_FLAGS flags){
-    if(!path){
+    vfcreate(get_root_dir(), path, flags);
+}
+
+vfile_t *vfcreate(vfile_t *parent_dir, char *relpath, FS_FILE_FLAGS flags){
+    if(!relpath){
         return;
     }
     
-    char *name = kmalloc((strlen(path) + 4095)/4096);//don't make modifications to the original string
-    strcpy(path, name);
-    // printf("Sizeof: %d\n", sizeof(vfile_t));
+    char *name = kmalloc((strlen(relpath) + 4095)/4096);//don't make modifications to the original string
+    strcpy(relpath, name);
     if(name[0] == '/') name++;//first slash just indicates that it's an absolute path, we don't want to include that into the filename.
     uint32_t name_length = strlen(name);
-    // printf("%s, %d: ", name, strlen(name));
     uint32_t name_index = 0;
     uint32_t subpath_start = 0;
     
     vfile_t *new_file = 0;
     
-    while(name[name_index]){//this condition shouldn't ever be triggered, but it's here to stop us if we're at the end.
     subpath_start = name_index;
     while(name[name_index] && name[name_index] != '/'){//split the string at directories
         name_index++;
@@ -41,14 +36,18 @@ vfile_t *fcreate(char *path, FS_FILE_FLAGS flags){
     name[name_index] = 0;
     // printf("%d, %s,", subpath_start, name + subpath_start);
     
-        if(name_index >= name_length){//this should be the only exit condition
-            printf("Creating file in dir; name: %s", name + subpath_start);
-            break;
+    if(name_index >= name_length){//if there is no other directory
+        // printf("Creating file; name: %s\n", name + subpath_start);
+        new_file = parent_dir->fileops->create(name, flags);
     }
-        
-        name_index++;
+    else{
+        vfile_t *new_parent = lookup(name, parent_dir);
+        if(!new_parent){
+            kfree(name);
+            return 0;
+        }
+        new_file = vfcreate(new_parent, name+name_index+1, flags);
     }
-    printf("\n");
     kfree(name);
     return new_file;
 }
@@ -65,9 +64,9 @@ int fread(vfile_t *file_entry, void *byte_array, uint32_t offset, uint32_t count
     return 0;
 }
 
-// vfile_t *lookup(char *name, vfile_t dir){
-//     return 0;
-// }
+vfile_t *lookup(char *name, vfile_t *dir){
+    return 0;
+}
 
 int readdir(vfile_t* file, vfile_t* buffer, uint32_t offset, uint32_t count){
     return 0;
@@ -77,8 +76,3 @@ vfile_t *fopen(char *name){
     
     return 0;
 }
-
-//create file in vfs
-vfile_t *vfs_create(char *path, FS_FILE_FLAGS flags){
-    
-}

src/kernel/system/vfs.h

@@ -9,33 +9,42 @@ typedef enum fs_flags{
     FS_FILE_ARCHIVE = 0x20,
     FS_FILE_PIPE = 0x40,
     FS_FILE_LINK = 0x80,
-    FS_FILE_MOUNT = 0x100,
+    FS_FILE_MOUNT = 0x100, // MUST be assigned to any file that represents a physical filesystem or physical device.
 }FS_FILE_FLAGS;
 
+typedef struct fileops{
+    struct virtual_file *(*create)(char *path, FS_FILE_FLAGS flags);
+    int (*delete)(struct virtual_file *file_entry);
+    int (*write)(struct virtual_file *file_entry, void *data, uint32_t offset, uint32_t count);
+    int (*read)(struct virtual_file *file_entry, void *data, uint32_t offset, uint32_t count);
+    struct virtual_file *(*open)(char *path);
+    void (*close)(struct virtual_file *file);
+    int (*readdir)(struct virtual_file* file, struct virtual_file *buffer, uint32_t count, uint32_t offset);
+    // struct virtual_file **(*lookup)(char *name);
+} fileops_t;
+
 typedef struct virtual_file{
     char name[212];
     uint16_t flags;
-    int (*delete)(struct virtual_file *file_entry);
-    struct virtual_file *(*create)(char *path, FS_FILE_FLAGS flags);
-    int (*write)(struct virtual_file *file_entry, void *data, uint32_t offset, uint32_t count);
-    int (*read)(struct virtual_file *file_entry, void *data, uint32_t offset, uint32_t count);
-    struct virtual_file *(*open)(char *path);
-    // struct virtual_file **(*lookup)(char *name);
-    int (*readdir)(struct virtual_file* file, struct virtual_file *buffer, uint32_t count, uint32_t offset);
+    
+    fileops_t *fileops;
+    uint32_t refcount; //filesystem MUST remain operational until all child refcounts == 0
     
     uint32_t id;//for use in drivers
-    void *ptr; //also for use in drivers
+    void *private; //also for use in drivers
     uint32_t size;
     uint32_t offset; //for use in drivers
     
 }vfile_t;
 
 // vfile_t *lookup(char *name, vfile_t dir);
-void vfs_init();
-vfile_t *fcreate(char *name, FS_FILE_FLAGS flags);
+vfile_t *fcreate(char *path, FS_FILE_FLAGS flags);
 int fdelete(vfile_t* file_entry);
 int fwrite(vfile_t *file_entry, void *byte_array, uint32_t offset, uint32_t count);
 int fread(vfile_t *file_entry, void *byte_array, uint32_t offset, uint32_t count);
 int readdir(vfile_t* file, vfile_t *buffer, uint32_t offset, uint32_t count);
 
+vfile_t *vfcreate(vfile_t *parent, char *relpath, FS_FILE_FLAGS flags);
+vfile_t *lookup(char *name, vfile_t *dir);
+
 vfile_t *fopen(char *path);

src/kmodules/modlib.h

@@ -76,7 +76,7 @@ typedef struct virtual_file{
     int (*readdir)(struct virtual_file* file, struct virtual_file *buffer, uint32_t count, uint32_t offset);
     
     uint32_t id;//for use in drivers
-    void *ptr; //also for use in drivers
+    void *private; //also for use in drivers
     uint32_t size;
     uint32_t offset; //for use in drivers