/****************************************************************************
 * fs/vfs/fs_mkdir.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include "vfs_config.h"
#include "errno.h"
#include "sys/types.h"
#include "sys/stat.h"
#include "stdlib.h"
#include "vnode.h"
#include "string.h"
#include "capability_api.h"
#include "path_cache.h"

/****************************************************************************
 * Private Functions
 ****************************************************************************/
int do_mkdir(int dirfd, const char *pathname, mode_t mode)
{
  struct Vnode *parentVnode = NULL;
  struct Vnode *vnode = NULL;
  struct Mount *mount = NULL;
  int ret;
  char *fullpath = NULL;
  char *relativepath = NULL;
  char *dirname = NULL;

  mode &= ~GetUmask();
  mode &= (S_IRWXU|S_IRWXG|S_IRWXO);

  /* Get absolute path by dirfd*/
  ret = get_path_from_fd(dirfd, &relativepath);
  if (ret < 0)
    {
      goto errout;
    }

  ret = vfs_normalize_path((const char *)relativepath, pathname, &fullpath);
  if (relativepath)
    {
      free(relativepath);
    }

  if (ret < 0)
    {
      goto errout;
    }
#ifdef LOSCFG_KERNEL_PLIMITS
  if (!strncmp(fullpath, "/dev", 4) || !strcmp(fullpath, "/proc"))
#else
  if (!strncmp(fullpath, "/dev", 4) || !strncmp(fullpath, "/proc", 5))
#endif
    {
      // virtual root create virtual dir
      VnodeHold();
      ret = VnodeLookup(fullpath, &vnode, V_DUMMY|V_CREATE);
      if (ret != OK)
        {
          goto errout_with_lock;
        }
      vnode->mode = mode | S_IFDIR;
      vnode->type = VNODE_TYPE_DIR;
      VnodeDrop();
      goto out;
    }

  dirname = strrchr(fullpath, '/') + 1;

  VnodeHold();
  ret = VnodeLookup(fullpath, &parentVnode, 0);
  if (ret == OK)
    {
      ret = -EEXIST;
      goto errout_with_lock;
    }

  if (parentVnode == NULL)
    {
      ret = -ENOENT;
      goto errout_with_lock;
    }
  mount = parentVnode->originMount;
  if ((mount != NULL) && (mount->mountFlags & MS_RDONLY))
    {
      ret = -EROFS;
      goto errout_with_lock;
    }

  parentVnode->useCount++;

  if (VfsVnodePermissionCheck(parentVnode, (WRITE_OP | EXEC_OP)))
    {
      ret = -EACCES;
      goto errout_with_count;
    }

  if ((parentVnode->vop != NULL) && (parentVnode->vop->Mkdir != NULL))
    {
      ret = parentVnode->vop->Mkdir(parentVnode, dirname, mode, &vnode);
    }
  else
    {
      ret = -ENOSYS;
    }

  if (ret < 0)
    {
      goto errout_with_count;
    }

  struct PathCache *dt = PathCacheAlloc(parentVnode, vnode, dirname, strlen(dirname));
  if (dt == NULL) {
      // alloc name cache failed is not a critical problem, let it go.
      PRINT_ERR("alloc path cache %s failed\n", dirname);
  }
  vnode->filePath = strdup(fullpath);
  parentVnode->useCount--;
  VnodeDrop();
out:
  /* Directory successfully created */
  free(fullpath);

  return OK;
errout_with_count:
  parentVnode->useCount--;
errout_with_lock:
  VnodeDrop();
errout:
  set_errno(-ret);
  if (fullpath)
    {
      free(fullpath);
    }
  return VFS_ERROR;
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: mkdir
 *
 * Description:  Create a directory
 *
 ****************************************************************************/

int mkdir(const char *pathname, mode_t mode)
{
  return do_mkdir(AT_FDCWD, pathname, mode);
}

/****************************************************************************
 * Name: mkdirat
 *
 * Description:  Create a directory by dirfd
 *
 ****************************************************************************/

int mkdirat(int dirfd, const char *pathname, mode_t mode)
{
  return do_mkdir(dirfd, pathname, mode);
}