!29 [Desc]fix bug: kernel crashed after rmdir the umounted folder

Merge pull request !29 from LeonChan/lc-master

fs/dirent/fs_opendir.c

@@ -130,7 +130,7 @@ DIR *opendir(const char *path)
     }
   if (ret < 0)
     {
-      goto errout;
+      goto errout_with_count;
     }
   dir->fd_status = DIRENT_MAGIC;
   dir->fd_root = vp;

fs/mount/fs_mount.c

@@ -259,7 +259,9 @@ int mount(const char *source, const char *target,
 
   mnt = MountAlloc(mountpt_vnode, (struct MountOps*)mops);
 
+  mountpt_vnode->useCount++;
   ret = mops->Mount(mnt, device, data);
+  mountpt_vnode->useCount--;
   if (ret != 0)
     {
       /* The vnode is unhappy with the blkdrvr for some reason.  Back out

fs/mount/fs_umount.c

@@ -85,9 +85,6 @@ BOOL fs_in_use(struct Mount *mnt, const char *target)
     return VnodeInUseIter(mnt->vnodeCovered);
 }
 
-struct Vnode *g_coveredVnodeList[100];
-int g_coveredVnodeTop = 0;
-
 int umount(const char *target)
 {
   struct Vnode *mountpt_vnode = NULL;
@@ -195,10 +192,6 @@ int umount(const char *target)
 #endif
   covered_vnode->newMount = NULL;
   covered_vnode->flag &= ~(VNODE_FLAG_MOUNT_NEW);
-  if (g_coveredVnodeTop < 100)
-    {
-      g_coveredVnodeList[g_coveredVnodeTop++] = covered_vnode;
-    }
   VnodeDrop();
 
   return OK;

fs/vfs/fs_mkdir.c

@@ -50,8 +50,6 @@
 #include "fs/path_cache.h"
 #include "fs/vfs_util.h"
 
-struct Vnode *g_parentOfCoveredVnode = NULL;
-
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -141,11 +139,6 @@ int do_mkdir(int dirfd, const char *pathname, mode_t mode)
       // alloc name cache failed is not a critical problem, let it go.
       PRINT_ERR("alloc path cache %s failed\n", dirname);
   }
-  if (!strcmp(dirname, "kernel"))
-    {
-        PRINT_ERR("%s-%d: vnode_of_kernel: %p, inode=%p \n", __FUNCTION__, __LINE__, vnode, vnode->data);
-        g_parentOfCoveredVnode = vnode;
-    }
   parentVnode->useCount--;
   VnodeDrop();
 out:

fs/vfs/fs_open.c

@@ -158,6 +158,7 @@ static int do_creat(struct Vnode **node, char *fullpath, mode_t mode)
       ret = -ENOSYS;
     }
 
+  parentNode->useCount--;
   if (ret < 0)
     {
       return ret;
@@ -235,7 +236,6 @@ int fp_open(char *fullpath, int oflags, mode_t mode)
           goto errout_without_count;
         }
       ret = do_creat(&vnode, fullpath, mode);
-      vnode->useCount--;
       if (ret != OK)
         {
           VnodeDrop();