|
|
/****************************************************************************
* fs/nfs/nfs_util.h
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <nuttx/config.h>
#include <sys/types.h>
#include <sys/time.h>
#include <stdint.h>
#include <queue.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/fs/dirent.h>
#include "nfs_proto.h"
#include "nfs_mount.h"
#include "nfs_node.h"
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nfs_semtake
****************************************************************************/
void nfs_semtake(struct nfsmount *nmp)
{
/* Take the semaphore (perhaps waiting) */
while (sem_wait(&nmp->nm_sem) != 0)
{
/* The only case that an error should occur here is if
* the wait was awakened by a signal.
*/
ASSERT(*get_errno_ptr() == EINTR);
}
}
/****************************************************************************
* Name: nfs_semgive
****************************************************************************/
void nfs_semgive(struct nfsmount *nmp)
{
sem_post(&nmp->nm_sem);
}
/****************************************************************************
* Name: nfs_checkmount
*
* Desciption: Check if the mountpoint is still valid.
*
* The caller should hold the mountpoint semaphore
*
****************************************************************************/
int nfs_checkmount(struct nfsmount *nmp)
{
struct nfsnode *file;
/* If the nm_mounted flag is false, then we have already handled the loss
* of the mount.
*/
DEBUGASSERT(nmp);
if (nmp->nm_mounted)
{
/* We still think the mount is healthy. Check an see if this is
* still the case
*/
#warning "This makes no sense... If you get here, then you know that nmp->nm_mounted and the code will always return OK. Something is wrong."
if (nmp->nm_mounted == true)
{
return OK;
}
/* If we get here, the mount is NOT healthy */
nmp->nm_mounted = false;
/* Make sure that this is flagged in every opened file */
for (file = nmp->nm_head; file; file = file->n_next)
{
file->n_open = false;
}
}
return -ENODEV;
}
|
