fs_foreachmountpoint.c

/****************************************************************************
 * fs/mount/fs_foreachmountpoint.c
 *
 *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/
#include "vfs_config.h"
#include "fs/mount.h"
#include "vnode.h"

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

/****************************************************************************
 * Name: foreach_mountpoint
 *
 * Description:
 *   Visit each mountpoint in the pseudo-file system.  The traversal is
 *   terminated when the callback 'handler' returns a non-zero value, or when
 *   all of the mountpoints have been visited.
 *
 *   This is just a front end "filter" to foreach_vnode() that forwards only
 *   mountpoint vnodes.  It is intended to support the mount() command to
 *   when the mount command is used to enumerate mounts.
 *
 *   NOTE 1: Use with caution... The pseudo-file system is locked throughout
 *   the traversal.
 *   NOTE 2: The search algorithm is recursive and could, in principle, use
 *   an indeterminant amount of stack space.  This will not usually be a
 *   real work issue.
 *
 ****************************************************************************/

int foreach_mountpoint(foreach_mountpoint_t handler, void *arg)
{
  int ret;
  struct Mount *mnt = NULL;
  struct statfs statBuf = {0};
  LIST_HEAD *mntList = GetMountList();
  LOS_DL_LIST_FOR_EACH_ENTRY(mnt, mntList, struct Mount, mountList)
    {
      if (mnt->ops->Statfs != NULL)
        {
           ret = mnt->ops->Statfs(mnt, &statBuf);
           if (ret == OK)
             {
                (void)handler(mnt->pathName, &statBuf, arg);
             }
        }
    }
  return 0;
}