Implement VFS syscalls

kernel/proc/proc.c

@@ -103,25 +103,38 @@ struct elf_aux proc_load_segments (struct proc* proc, uint8_t* elf) {
   return aux;
 }
 
-struct proc* proc_from_file (const char* mountpoint, const char* path) {
+struct proc* proc_from_file (struct procgroup* procgroup, const char* mountpoint,
+                             const char* path) {
   struct fs_desc_buffer desc;
 
-  if (vfs_describe (mountpoint, path, &desc) != ST_OK)
+  if (vfs_open (procgroup, mountpoint, path) != ST_OK)
     return NULL;
 
-  if (desc.type != FS_FILE)
+  if (vfs_describe (procgroup, mountpoint, path, &desc) != ST_OK) {
+    vfs_close (procgroup, mountpoint, path);
     return NULL;
+  }
+
+  if (desc.type != FS_FILE) {
+    vfs_close (procgroup, mountpoint, path);
+    return NULL;
+  }
 
   uint8_t* temp_buffer = malloc (desc.size);
 
-  if (temp_buffer == NULL)
-    return NULL;
-
-  if (vfs_read (mountpoint, path, temp_buffer, 0, desc.size) != ST_OK) {
-    free (temp_buffer);
+  if (temp_buffer == NULL) {
+    vfs_close (procgroup, mountpoint, path);
     return NULL;
   }
 
+  if (vfs_read (procgroup, mountpoint, path, temp_buffer, 0, desc.size) != ST_OK) {
+    free (temp_buffer);
+    vfs_close (procgroup, mountpoint, path);
+    return NULL;
+  }
+
+  vfs_close (procgroup, mountpoint, path);
+
   bool ok = proc_check_elf (temp_buffer);
 
   DEBUG ("Spawning %s:%s, elf header %s\n", mountpoint, path, ok ? "ok" : "bad");
@@ -300,11 +313,11 @@ void proc_init (void) {
   irq_attach (&proc_irq_sched, NULL, CPU_REQUEST_SCHED);
 #endif
 
-  struct proc* spin_proc = proc_from_file ("ramdisk", "/spin");
+  struct proc* spin_proc = proc_from_file (NULL, "ramdisk", "/spin");
   struct cpu* spin_cpu = thiscpu;
   proc_register (spin_proc, &spin_cpu);
 
-  struct proc* init = proc_from_file ("ramdisk", "/init");
+  struct proc* init = proc_from_file (NULL, "ramdisk", "/init");
   init->procgroup->capabilities |= (PROC_CAP_TERMINAL | PROC_CAP_KB);
   struct cpu* init_cpu = thiscpu;
   proc_register (init, &init_cpu);

kernel/proc/proc.h

@@ -51,7 +51,7 @@ bool proc_kill (struct proc* proc, struct cpu** reschedule_cpu);
 struct elf_aux proc_load_segments (struct proc* proc, uint8_t* elf);
 bool proc_register (struct proc* proc, struct cpu** reschedule_cpu);
 struct proc* proc_find_pid (int pid);
-struct proc* proc_from_file (const char* mountpoint, const char* path);
+struct proc* proc_from_file (struct procgroup* procgroup, const char* mountpoint, const char* path);
 void proc_init (void);
 
 #endif // _KERNEL_PROC_PROC_H

kernel/proc/procgroup.c

@@ -1,3 +1,4 @@
+#include <fs/vfs.h>
 #include <libk/rbtree.h>
 #include <libk/std.h>
 #include <libk/string.h>
@@ -195,6 +196,10 @@ void procgroup_detach (struct procgroup* procgroup, struct proc* proc) {
       proc_delete_resource (resource, &reschedule_cpu);
     }
 
+    /* unlock VFS owned mountpoints */
+    vfs_procgroup_cleanup (procgroup);
+
+    /* delete mappings */
     struct list_node_link *mapping_link, *mapping_link_tmp;
     list_foreach (procgroup->mappings, mapping_link, mapping_link_tmp) {
       struct proc_mapping* mapping =