예제 #1
0
파일: inode.c 프로젝트: cse451/os161
/*
 * Count a link. Only for regular files because that's what the caller
 * does. (And that, in turn, is because the link count of a directory
 * is a local property.)
 */
void
inode_addlink(uint32_t ino)
{
	struct inodeinfo *inf;

	inf = inode_find(ino);
	assert(inf->type == SFS_TYPE_FILE);
	assert(inf->visited == 0);
	inf->linkcount++;
}
예제 #2
0
파일: fs_rmdir.c 프로젝트: 1015472/PX4NuttX
int rmdir(FAR const char *pathname)
{
  FAR struct inode *inode;
  const char       *relpath = NULL;
  int               ret;

  /* Get an inode for this file */

  inode = inode_find(pathname, &relpath);
  if (!inode)
    {
      /* There is no mountpoint that includes in this path */

      ret = ENOENT;
      goto errout;
    }

  /* Verify that the inode is a valid mountpoint. */

  if (!INODE_IS_MOUNTPT(inode) || !inode->u.i_mops)
    {
      ret = ENXIO;
      goto errout_with_inode;
    }

  /* Perform the rmdir operation using the relative path
   * at the mountpoint.
   */

  if (inode->u.i_mops->rmdir)
    {
      ret = inode->u.i_mops->rmdir(inode, relpath);
      if (ret < 0)
        {
          ret = -ret;
          goto errout_with_inode;
        }
    }
  else
    { 
      ret = ENOSYS;
      goto errout_with_inode;
    }

  /* Successfully removed the directory */

  inode_release(inode);
  return OK;

 errout_with_inode:
  inode_release(inode);
 errout:
  set_errno(ret);
  return ERROR;
}
예제 #3
0
int find_blockdriver(FAR const char *pathname, int mountflags, FAR struct inode **ppinode)
{
  FAR struct inode *inode;
  int ret = 0; /* Assume success */

  /* Sanity checks */
#ifdef CONFIG_DEBUG
  if (!pathname || !ppinode)
    {
      ret = -EINVAL;
      goto errout;
    }
#endif

  /* Find the inode registered with this pathname */

  inode = inode_find(pathname, NULL);
  if (!inode)
    {
      fdbg("Failed to find %s\n", pathname);
      ret = -ENOENT;
      goto errout;
    }

  /* Verify that the inode is a block driver. */

  if (!INODE_IS_BLOCK(inode))
    { 
      fdbg("%s is not a block driver\n", pathname);
      ret = -ENOTBLK;
      goto errout_with_inode;
   }

  /* Make sure that the inode supports the requested access */

  if (!inode->u.i_bops || !inode->u.i_bops->read ||
      (!inode->u.i_bops->write && (mountflags & MS_RDONLY) == 0))
    {
      fdbg("%s does not support requested access\n", pathname);
      ret = -EACCES;
      goto errout_with_inode;
    }

  *ppinode = inode;
  return OK;

errout_with_inode:
  inode_release(inode);
errout:
  return ret;
}
예제 #4
0
int
nfs_gfid_loc_fill (inode_table_t *itable, uuid_t gfid, loc_t *loc, int how)
{
        int             ret = -EFAULT;
        inode_t         *inode = NULL;

        if (!loc)
                return ret;

        inode = inode_find (itable, gfid);
        if (!inode) {
		gf_msg_trace (GF_NFS, 0, "Inode not found in itable, will "
                              "try to create one.");
                if (how == NFS_RESOLVE_CREATE) {
			gf_msg_trace (GF_NFS, 0, "Inode needs to be created.");
                        inode = inode_new (itable);
                        if (!inode) {
                                gf_msg (GF_NFS, GF_LOG_ERROR, ENOMEM,
                                        NFS_MSG_NO_MEMORY, "Failed to "
                                        "allocate memory");
                                ret = -ENOMEM;
                                goto err;
                        }

                } else {
			gf_msg (GF_NFS, GF_LOG_ERROR, ENOENT,
                                NFS_MSG_INODE_NOT_FOUND, "Inode not found in "
                                "itable and no creation was requested.");
                        ret = -ENOENT;
                        goto err;
                }
        } else {
		gf_msg_trace (GF_NFS, 0, "Inode was found in the itable.");
	}

        gf_uuid_copy (loc->gfid, gfid);

        ret = nfs_inode_loc_fill (inode, loc, how);
	if (ret < 0) {
		gf_msg (GF_NFS, GF_LOG_ERROR, -ret,
                        NFS_MSG_INODE_LOC_FILL_ERROR,
                        "Inode loc filling failed.: %s", strerror (-ret));
		goto err;
	}

err:
        if (inode)
                inode_unref (inode);
        return ret;
}
예제 #5
0
파일: inode.c 프로젝트: cse451/os161
/*
 * Mark an inode (directories only, because that's all the caller
 * does) visited. Returns nonzero if already visited.
 *
 * Note that there is no way to clear the visited flag for now because
 * it's only used once (by pass2).
 */
int
inode_visitdir(uint32_t ino)
{
	struct inodeinfo *inf;

	inf = inode_find(ino);
	assert(inf->type == SFS_TYPE_DIR);
	assert(inf->linkcount == 0);
	if (inf->visited) {
		return 1;
	}
	inf->visited = 1;
	return 0;
}
예제 #6
0
파일: fs_open.c 프로젝트: 1015472/PX4NuttX
int open(const char *path, int oflags, ...)
{
  FAR struct filelist *list;
  FAR struct inode    *inode;
  FAR const char      *relpath = NULL;
#if defined(CONFIG_FILE_MODE) || !defined(CONFIG_DISABLE_MOUNTPOINT)
  mode_t               mode = 0666;
#endif
  int                  ret;
  int                  fd;

  /* Get the thread-specific file list */

  list = sched_getfiles();
  if (!list)
    {
      ret = EMFILE;
      goto errout;
    }

#ifdef CONFIG_FILE_MODE
#  ifdef CONFIG_CPP_HAVE_WARNING
#    warning "File creation not implemented"
#  endif

  /* If the file is opened for creation, then get the mode bits */

  if (oflags & (O_WRONLY|O_CREAT) != 0)
    {
      va_list ap;
      va_start(ap, oflags);
      mode = va_arg(ap, mode_t);
      va_end(ap);
    }
#endif

  /* Get an inode for this file */

  inode = inode_find(path, &relpath);
  if (!inode)
    {
      /* "O_CREAT is not set and the named file does not exist.  Or, a
       * directory component in pathname does not exist or is a dangling
       * symbolic link."
       */

      ret = ENOENT;
      goto errout;
    }

  /* Verify that the inode is valid and either a "normal" or a mountpoint.  We
   * specifically exclude block drivers.
   */

#ifndef CONFIG_DISABLE_MOUNTPOINT
  if ((!INODE_IS_DRIVER(inode) && !INODE_IS_MOUNTPT(inode)) || !inode->u.i_ops)
#else
  if (!INODE_IS_DRIVER(inode) || !inode->u.i_ops)
#endif
    {
      ret = ENXIO;
      goto errout_with_inode;
    }

  /* Make sure that the inode supports the requested access */

  ret = inode_checkflags(inode, oflags);
  if (ret < 0)
    {
      ret = -ret;
      goto errout_with_inode;
    }

  /* Associate the inode with a file structure */

  fd = files_allocate(inode, oflags, 0, 0);
  if (fd < 0)
    {
      ret = EMFILE;
      goto errout_with_inode;
    }

  /* Perform the driver open operation.  NOTE that the open method may be
   * called many times.  The driver/mountpoint logic should handled this
   * because it may also be closed that many times.
   */

  ret = OK;
  if (inode->u.i_ops->open)
    {
#ifndef CONFIG_DISABLE_MOUNTPOINT
      if (INODE_IS_MOUNTPT(inode))
        {
          ret = inode->u.i_mops->open((FAR struct file*)&list->fl_files[fd],
                                      relpath, oflags, mode);
        }
      else
#endif
        {
          ret = inode->u.i_ops->open((FAR struct file*)&list->fl_files[fd]);
        }
    }

  if (ret < 0)
    {
      ret = -ret;
      goto errout_with_fd;
    }

  return fd;

 errout_with_fd:
  files_release(fd);
 errout_with_inode:
  inode_release(inode);
 errout:
  set_errno(ret);
  return ERROR;
}
예제 #7
0
struct glfs_object *
glfs_h_create_from_handle (struct glfs *fs, unsigned char *handle, int len,
			   struct stat *stat)
{
	loc_t               loc = {0, };
	int                 ret = -1;
	struct iatt         iatt = {0, };
	inode_t            *newinode = NULL;
	xlator_t           *subvol = NULL;
	struct glfs_object *object = NULL;

	/* validate in args */
	if ((fs == NULL) || (handle == NULL) || (len != GFAPI_HANDLE_LENGTH)) {
		errno = EINVAL;
		return NULL;
	}

	__glfs_entry_fs (fs);

	/* get the active volume */
	subvol = glfs_active_subvol (fs);
	if (!subvol) {
		errno = EIO;
		goto out;
	}

	memcpy (loc.gfid, handle, GFAPI_HANDLE_LENGTH);

	newinode = inode_find (subvol->itable, loc.gfid);
	if (newinode)
		loc.inode = newinode;
	else {
		loc.inode = inode_new (subvol->itable);
		if (!loc.inode) {
			errno = ENOMEM;
			goto out;
		}
	}

	ret = syncop_lookup (subvol, &loc, 0, &iatt, 0, 0);
        DECODE_SYNCOP_ERR (ret);
	if (ret) {
		gf_log (subvol->name, GF_LOG_WARNING,
			"inode refresh of %s failed: %s",
			uuid_utoa (loc.gfid), strerror (errno));
		goto out;
	}

	newinode = inode_link (loc.inode, 0, 0, &iatt);
	if (newinode)
		inode_lookup (newinode);
	else {
		gf_log (subvol->name, GF_LOG_WARNING,
			"inode linking of %s failed: %s",
			uuid_utoa (loc.gfid), strerror (errno));
		errno = EINVAL;
		goto out;
	}

	/* populate stat */
	if (stat)
		glfs_iatt_to_stat (fs, &iatt, stat);

	object = GF_CALLOC (1, sizeof(struct glfs_object),
			    glfs_mt_glfs_object_t);
	if (object == NULL) {
		errno = ENOMEM;
		ret = -1;
		goto out;
	}

	/* populate the return object */
	object->inode = newinode;
	uuid_copy (object->gfid, object->inode->gfid);

out:
	/* TODO: Check where the inode ref is being held? */
	loc_wipe (&loc);

	glfs_subvol_done (fs, subvol);

	return object;
}
예제 #8
0
int stat(const char *path, FAR struct stat *buf)
{
  FAR struct inode *inode;
  const char       *relpath = NULL;
  int               ret     = OK;

  /* Sanity checks */

  if (!path || !buf)
    {
      ret = EFAULT;
      goto errout;
    }

  if (!path[0])
    {
      ret = ENOENT;
      goto errout;
    }

  /* Check for the fake root directory (which has no inode) */

  if (strcmp(path, "/") == 0)
    {
      return statroot(buf);
    }

  /* Get an inode for this file */

  inode = inode_find(path, &relpath);
  if (!inode)
    {
      /* This name does not refer to a psudeo-inode and there is no
       * mountpoint that includes in this path.
       */

      ret = ENOENT;
      goto errout;
    }

  /* The way we handle the stat depends on the type of inode that we
   * are dealing with.
   */

#ifndef CONFIG_DISABLE_MOUNTPOINT
  if (INODE_IS_MOUNTPT(inode))
    {
      /* The node is a file system mointpoint. Verify that the mountpoint
       * supports the stat() method
       */

      if (inode->u.i_mops && inode->u.i_mops->stat)
        {
          /* Perform the stat() operation */

          ret = inode->u.i_mops->stat(inode, relpath, buf);
        }
    }
  else
#endif
    {
      /* The node is part of the root pseudo file system */

      ret = statpseudo(inode, buf);
    }

  /* Check if the stat operation was successful */

  if (ret < 0)
    {
      ret = -ret;
      goto errout_with_inode;
    }

  /* Successfully stat'ed the file */

  inode_release(inode);
  return OK;

/* Failure conditions always set the errno appropriately */

errout_with_inode:
  inode_release(inode);
errout:
  set_errno(ret);
  return ERROR;
}
예제 #9
0
int rename(FAR const char *oldpath, FAR const char *newpath)
{
  FAR struct inode *oldinode;
  FAR struct inode *newinode;
  const char       *oldrelpath = NULL;
#ifndef CONFIG_DISABLE_MOUNTPOINT
  const char       *newrelpath = NULL;
#endif
  int               errcode;
  int               ret;

  /* Ignore paths that are interpreted as the root directory which has no name
   * and cannot be moved
   */

  if (!oldpath || *oldpath == '\0' || oldpath[0] != '/' ||
      !newpath || *newpath == '\0' || newpath[0] != '/')
    {
      return -EINVAL;
    }

  /* Get an inode that includes the oldpath */

  oldinode = inode_find(oldpath, &oldrelpath);
  if (!oldinode)
    {
      /* There is no inode that includes in this path */

      errcode = ENOENT;
      goto errout;
    }

#ifndef CONFIG_DISABLE_MOUNTPOINT
  /* Verify that the old inode is a valid mountpoint. */

  if (INODE_IS_MOUNTPT(oldinode) && oldinode->u.i_mops)
    {
      /* Get an inode for the new relpath -- it should like on the same
       * mountpoint
       */

      newinode = inode_find(newpath, &newrelpath);
      if (!newinode)
        {
          /* There is no mountpoint that includes in this path */

          errcode = ENOENT;
          goto errout_with_oldinode;
        }

      /* Verify that the two paths lie on the same mountpoint inode */

      if (oldinode != newinode)
        {
          errcode = EXDEV;
          goto errout_with_newinode;
        }

      /* Perform the rename operation using the relative paths
       * at the common mountpoint.
       */

      if (oldinode->u.i_mops->rename)
        {
          ret = oldinode->u.i_mops->rename(oldinode, oldrelpath, newrelpath);
          if (ret < 0)
            {
              errcode = -ret;
              goto errout_with_newinode;
            }
        }
      else
        {
          errcode = ENOSYS;
          goto errout_with_newinode;
        }

      /* Successfully renamed */

      inode_release(newinode);
    }
  else
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
    {
      /* Create a new, empty inode at the destination location.
       * NOTE that the new inode will be created with a reference count
       * of  zero.
       */

      inode_semtake();
      ret = inode_reserve(newpath, &newinode);
      if (ret < 0)
        {
          /* It is an error if a node at newpath already exists in the tree
           * OR if we fail to allocate memory for the new inode (and possibly
           * any new intermediate path segments).
           */

          inode_semgive();
          errcode = EEXIST;
          goto errout_with_oldinode;
        }

      /* Copy the inode state from the old inode to the newly allocated inode */

      newinode->i_child   = oldinode->i_child;   /* Link to lower level inode */
      newinode->i_flags   = oldinode->i_flags;   /* Flags for inode */
      newinode->u.i_ops   = oldinode->u.i_ops;   /* Inode operations */
#ifdef CONFIG_FILE_MODE
      newinode->i_mode    = oldinode->i_mode;    /* Access mode flags */
#endif
      newinode->i_private = oldinode->i_private; /* Per inode driver private data */

      /* We now have two copies of the inode.  One with a reference count of
       * zero (the new one), and one that may have multiple references
       * including one by this logic (the old one)
       *
       * Remove the old inode.  Because we hold a reference count on the
       * inode, it will not be deleted now.  It will be deleted when all of
       * the references to to the inode have been released (perhaps when
       * inode_release() is called below).  inode_remove() should return
       * -EBUSY to indicate that the inode was not deleted now.
       */

      ret = inode_remove(oldpath);
      if (ret < 0 && ret != -EBUSY)
        {
          /* Remove the new node we just recreated */

          (void)inode_remove(newpath);
          inode_semgive();

          errcode = -ret;
          goto errout_with_oldinode;
        }

      /* Remove all of the children from the unlinked inode */

      oldinode->i_child = NULL;
      inode_semgive();
    }
#else
    {
      errcode = ENXIO;
      goto errout;
    }
#endif

  /* Successfully renamed */

  inode_release(oldinode);
  return OK;

#ifndef CONFIG_DISABLE_MOUNTPOINT
errout_with_newinode:
  inode_release(newinode);
#endif
errout_with_oldinode:
  inode_release(oldinode);
errout:
  set_errno(errcode);
  return ERROR;
}
예제 #10
0
mqd_t mq_open(FAR const char *mq_name, int oflags, ...)
{
  FAR struct inode *inode;
  FAR const char *relpath = NULL;
  FAR struct mqueue_inode_s *msgq;
  char fullpath[MAX_MQUEUE_PATH];
  va_list ap;
  struct mq_attr *attr;
  mqd_t mqdes;
  mode_t mode;
  int errcode;
  int ret;

  /* Make sure that a non-NULL name is supplied */

  if (!mq_name)
    {
      errcode = EINVAL;
      goto errout;
    }

  /* Get the full path to the message queue */

  snprintf(fullpath, MAX_MQUEUE_PATH, CONFIG_FS_MQUEUE_MPATH "/%s", mq_name);

  /* Make sure that the check for the existence of the message queue
   * and the creation of the message queue are atomic with respect to
   * other processes executing mq_open().  A simple sched_lock() should
   * be sufficient.
   */

  sched_lock();

  /* Get the inode for this mqueue.  This should succeed if the message
   * queue has already been created.
   */

  inode = inode_find(fullpath, &relpath);
  if (inode)
    {
      /* It exists.  Verify that the inode is a message queue */

      if (!INODE_IS_MQUEUE(inode))
        {
          errcode = ENXIO;
          goto errout_with_inode;
        }

      /* It exists and is a message queue.  Check if the caller wanted to
       * create a new mqueue with this name.
       */

      if ((oflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL))
        {
          errcode = EEXIST;
          goto errout_with_inode;
        }

      /* Create a message queue descriptor for the current thread */

      msgq  = inode->u.i_mqueue;
      mqdes = mq_descreate(NULL, msgq, oflags);
      if (!mqdes)
        {
          errcode = ENOMEM;
          goto errout_with_inode;
        }
    }
  else
    {
      /* The mqueue does not exists.  Were we asked to create it? */

      if ((oflags & O_CREAT) == 0)
        {
          /* The mqueue does not exist and O_CREAT is not set */

          errcode = ENOENT;
          goto errout_with_lock;
        }

     /* Create the mqueue.  First we have to extract the additional
      * parameters from the variable argument list.
      */

      va_start(ap, oflags);
      mode = va_arg(ap, mode_t);
      attr = va_arg(ap, FAR struct mq_attr*);
      va_end(ap);

      /* Create an inode in the pseudo-filesystem at this path */

      inode_semtake();
      ret = inode_reserve(fullpath, &inode);
      inode_semgive();

      if (ret < 0)
        {
          errcode = -ret;
          goto errout_with_lock;
        }

      /* Allocate memory for the new message queue. */

      msgq = (FAR struct mqueue_inode_s*)mq_msgqalloc(mode, attr);
      if (!msgq)
        {
          errcode = ENOSPC;
          goto errout_with_inode;
        }

      /* Create a message queue descriptor for the TCB */

       mqdes = mq_descreate(NULL, msgq, oflags);
       if (!mqdes)
         {
           errcode = ENOMEM;
           goto errout_with_msgq;
         }

      /* Bind the message queue and the inode structure */

      INODE_SET_MQUEUE(inode);
      inode->u.i_mqueue = msgq;
      msgq->inode       = inode;

    }

  sched_unlock();
  return mqdes;

errout_with_msgq:
  mq_msgqfree(msgq);
  inode->u.i_mqueue = NULL;
errout_with_inode:
  inode_release(inode);
errout_with_lock:
  sched_unlock();
errout:
  set_errno(errcode);
  return (mqd_t)ERROR;
}
예제 #11
0
int umount2(FAR const char *target, unsigned int flags)
{
  FAR struct inode *mountpt_inode;
  FAR struct inode *blkdrvr_inode = NULL;
  struct inode_search_s desc;
  int errcode = OK;
  int ret;

  /* Verify required pointer arguments */

  if (!target)
    {
      errcode = EFAULT;
      goto errout;
    }

  /* Find the mountpt */

  SETUP_SEARCH(&desc, target, false);

  ret = inode_find(&desc);
  if (ret < 0)
    {
      errcode = ENOENT;
      goto errout_with_search;
    }

  /* Get the search results */

  mountpt_inode = desc.node;
  DEBUGASSERT(mountpt_inode != NULL);

  /* Verify that the inode is a mountpoint */

  if (!INODE_IS_MOUNTPT(mountpt_inode))
    {
      errcode = EINVAL;
      goto errout_with_mountpt;
    }

  /* Unbind the block driver from the file system (destroying any fs
   * private data.
   */

  if (!mountpt_inode->u.i_mops->unbind)
    {
      /* The filesystem does not support the unbind operation ??? */

      errcode = EINVAL;
      goto errout_with_mountpt;
    }

  /* The unbind method returns the number of references to the
   * filesystem (i.e., open files), zero if the unbind was
   * performed, or a negated error code on a failure.
   */

  inode_semtake(); /* Hold the semaphore through the unbind logic */
  ret = mountpt_inode->u.i_mops->unbind(mountpt_inode->i_private,
                                       &blkdrvr_inode, flags);
  if (ret < 0)
    {
      /* The inode is unhappy with the blkdrvr for some reason */

      errcode = -ret;
      goto errout_with_semaphore;
    }
  else if (ret > 0)
    {
      errcode = EBUSY;
      goto errout_with_semaphore;
    }

  /* Successfully unbound.  Convert the mountpoint inode to regular
   * pseudo-file inode.
   */


  mountpt_inode->i_flags  &= ~FSNODEFLAG_TYPE_MASK;
  mountpt_inode->i_private = NULL;
  mountpt_inode->u.i_mops  = NULL;

#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
  /* If the node has children, then do not delete it. */

  if (mountpt_inode->i_child != NULL)
    {
       /* Just decrement the reference count (without deleting it) */

       DEBUGASSERT(mountpt_inode->i_crefs > 0);
       mountpt_inode->i_crefs--;
    }
  else
#endif
    {
      /* Remove the mountpoint inode from the inode tree.  The inode will
       * not be deleted yet because there is still at least reference on
       * it (from the mount)
       */

      ret = inode_remove(target);
      inode_semgive();

      /* The return value of -EBUSY is normal (in fact, it should
       * not be OK)
       */

      if (ret != OK && ret != -EBUSY)
        {
          errcode = -ret;
          goto errout_with_mountpt;
       }

      /* Release the mountpoint inode and any block driver inode
       * returned by the file system unbind above.  This should cause
       * the inode to be deleted (unless there are other references)
       */

      inode_release(mountpt_inode);
    }

  /* Did the unbind method return a contained block driver */

  if (blkdrvr_inode)
    {
      inode_release(blkdrvr_inode);
    }

  RELEASE_SEARCH(&desc);
  return OK;

  /* A lot of goto's!  But they make the error handling much simpler */

errout_with_semaphore:
  inode_semgive();

errout_with_mountpt:
  inode_release(mountpt_inode);
  if (blkdrvr_inode)
    {
      inode_release(blkdrvr_inode);
    }

errout_with_search:
  RELEASE_SEARCH(&desc);

errout:
  set_errno(errcode);
  return ERROR;
}
예제 #12
0
파일: fs_syslog.c 프로젝트: KimMui/i2sTest
int syslog_initialize(void)
{
  FAR struct inode    *inode;
  FAR const char      *relpath = NULL;
  int                  ret;

  /* At this point, the only expected states are SYSLOG_UNINITIALIZED or
   * SYSLOG_REOPEN..  Not SYSLOG_INITIALIZING, SYSLOG_FAILURE, SYSLOG_OPENED.
   */

  DEBUGASSERT(g_sysdev.sl_state == SYSLOG_UNINITIALIZED ||
              g_sysdev.sl_state == SYSLOG_REOPEN);

  g_sysdev.sl_state = SYSLOG_INITIALIZING;

  /* Try to open the device.
   *
   * Note that we cannot just call open.  The syslog device must work on all
   * threads.  Open returns a file descriptor that is valid only for the
   * task that opened the device (and its pthread children).  Instead, we
   * essentially re-implement the guts of open() here so that we can get to
   * the thread-independent structures of the inode.
   */

  /* Get an inode for this file/device */

  inode = inode_find(CONFIG_SYSLOG_DEVPATH, &relpath);
  if (!inode)
    {
      /* The inode was not found.  In this case, we will attempt to re-open
       * the device repeatedly.  The assumption is that the device path is
       * valid but that the driver has not yet been registered.
       */

      g_sysdev.sl_state = SYSLOG_REOPEN;
      return -ENOENT;
    }

  /* Verify that the inode is valid and either a character driver or a
   * mountpoint.
   */

#ifndef CONFIG_DISABLE_MOUNTPOINT
  if ((!INODE_IS_DRIVER(inode) && !INODE_IS_MOUNTPT(inode)))
#else
  if (!INODE_IS_DRIVER(inode))
#endif
    {
      ret = -ENXIO;
      goto errout_with_inode;
    }

  /* Make sure that the "entity" at this inode supports write access */

  if (!inode->u.i_ops || !inode->u.i_ops->write)
    {
      ret = -EACCES;
      goto errout_with_inode;
    }

  /* Initialize the file structure */

  g_sysdev.sl_file.f_oflags = SYSLOG_OFLAGS;
  g_sysdev.sl_file.f_pos    = 0;
  g_sysdev.sl_file.f_inode  = inode;

  /* Perform the low-level open operation. */

  ret = OK;
  if (inode->u.i_ops->open)
    {
      /* Is the inode a mountpoint? */

#ifndef CONFIG_DISABLE_MOUNTPOINT
      if (INODE_IS_MOUNTPT(inode))
        {
          /* Yes.  Open the device write-only, try to create it if it
           * doesn't exist, if the file that already exists, then append the
           * new log data to end of the file.
           */

          ret = inode->u.i_mops->open(&g_sysdev.sl_file, relpath,
                                      SYSLOG_OFLAGS, 0666);
        }

      /* No... then it must be a character driver in the NuttX pseudo-
       * file system.
       */

      else
#endif
        {
          ret = inode->u.i_ops->open(&g_sysdev.sl_file);
        }
    }

  /* Was the file/device successfully opened? */

  if (ret < 0)
    {
      ret = -ret;
      goto errout_with_inode;
    }

  /* The SYSLOG device is open and ready for writing. */

  sem_init(&g_sysdev.sl_sem, 0, 1);
  g_sysdev.sl_holder = NO_HOLDER;
  g_sysdev.sl_state  = SYSLOG_OPENED;
  return OK;

 errout_with_inode:
  inode_release(inode);
  g_sysdev.sl_state = SYSLOG_FAILURE;
  return ret;
}
예제 #13
0
static int fat_attrib(const char *path, fat_attrib_t *retattrib,
                      fat_attrib_t setbits, fat_attrib_t clearbits)
{
  struct fat_mountpt_s *fs;
  struct fat_dirinfo_s  dirinfo;
  FAR struct inode     *inode;
  const char           *relpath = NULL;
  uint8_t              *direntry;
  uint8_t               oldattributes;
  uint8_t               newattributes;
  int                   ret;

  /* Get an inode for this file */

  inode = inode_find(path, &relpath);
  if (!inode)
    {
      /* There is no mountpoint that includes in this path */

      ret = ENOENT;
      goto errout;
    }

  /* Verify that the inode is a valid mountpoint. */

  if (!INODE_IS_MOUNTPT(inode) || !inode->u.i_mops || !inode->i_private)
    {
      ret = ENXIO;
      goto errout_with_inode;
    }

  /* Get the mountpoint private data from the inode structure */

  fs = inode->i_private;

  /* Check if the mount is still healthy */

  fat_semtake(fs);
  ret = fat_checkmount(fs);
  if (ret != OK)
    {
      goto errout_with_semaphore;
    }

  /* Find the file/directory entry for the oldrelpath */

  ret = fat_finddirentry(fs, &dirinfo, relpath);
  if (ret != OK)
    {
      /* Some error occurred -- probably -ENOENT */

      goto errout_with_semaphore;
    }

  /* Make sure that we found some valid file or directory */

  if (dirinfo.fd_root)
    {
      /* Ooops.. we found the root directory */

      ret = EACCES;
      goto errout_with_semaphore;
    }

  /* Get the current attributes */

  direntry      = &fs->fs_buffer[dirinfo.fd_seq.ds_offset];
  oldattributes = DIR_GETATTRIBUTES(direntry);
  newattributes = oldattributes;

  /* Set or clear any bits as requested */

  newattributes &= ~(clearbits & (FATATTR_READONLY|FATATTR_HIDDEN|FATATTR_SYSTEM|FATATTR_ARCHIVE));
  newattributes |=  (setbits   & (FATATTR_READONLY|FATATTR_HIDDEN|FATATTR_SYSTEM|FATATTR_ARCHIVE));

  /* Did any thingchange? */

  if (newattributes != oldattributes)
    {
      DIR_PUTATTRIBUTES(direntry, newattributes);
      fs->fs_dirty = true;
      ret = fat_updatefsinfo(fs);
      if (ret != OK)
        {
          ret = -ret;
          goto errout_with_semaphore;
        }
    }

  /* Success */

  if (retattrib)
    {
      *retattrib = newattributes;
    }

  fat_semgive(fs);
  inode_release(inode);
  return OK;

errout_with_semaphore:
  fat_semgive(fs);
errout_with_inode:
  inode_release(inode);
errout:
  *get_errno_ptr() = ret;
  return ERROR;
}
예제 #14
0
파일: fs_rmdir.c 프로젝트: KimMui/i2sTest
int rmdir(FAR const char *pathname)
{
  FAR struct inode *inode;
  const char       *relpath = NULL;
  int               errcode;

  /* Get an inode for this file.  inode_find() automatically increments the
   * reference count on the inode if one is found.
   */

  inode = inode_find(pathname, &relpath);
  if (!inode)
    {
      /* There is no inode that includes in this path */

      errcode = ENOENT;
      goto errout;
    }

#ifndef CONFIG_DISABLE_MOUNTPOINT
  /* Check if the inode is a valid mountpoint. */

  if (INODE_IS_MOUNTPT(inode) && inode->u.i_mops)
    {
      /* Perform the rmdir operation using the relative path
       * from the mountpoint.
       */

      if (inode->u.i_mops->rmdir)
        {
          int ret = inode->u.i_mops->rmdir(inode, relpath);
          if (ret < 0)
            {
              errcode = -ret;
              goto errout_with_inode;
            }
        }
      else
        {
          errcode = ENOSYS;
          goto errout_with_inode;
        }
    }
  else
#endif

#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
  /* If this is a "dangling" pseudo-directory node (i.e., it has no operations)
   * then rmdir should remove the node.
   */

  if (!inode->u.i_ops)
    {
      int ret;

      /* If the directory inode has children, however, then it cannot be
       * removed.
       */

      if (inode->i_child)
        {
          errcode = ENOTEMPTY;
          goto errout_with_inode;
        }

      /* Remove the inode.  NOTE: Because we hold a reference count on the
       * inode, it will not be deleted now.  But probably when inode_release()
       * is called below.  inode_remove should return -EBUSY to indicate that
       * the inode was not deleted now.
       */

      inode_semtake();
      ret = inode_remove(pathname);
      inode_semgive();

      if (ret < 0 && ret != -EBUSY)
        {
          errcode = -ret;
          goto errout_with_inode;
        }
    }
  else
    {
      errcode = ENOTDIR;
      goto errout_with_inode;
    }
#else
    {
      errcode = ENXIO;
      goto errout_with_inode;
    }
#endif

  /* Successfully removed the directory */

  inode_release(inode);
  return OK;

errout_with_inode:
  inode_release(inode);
errout:
  set_errno(errcode);
  return ERROR;
}
예제 #15
0
int mkdir(const char *pathname, mode_t mode)
{
  FAR struct inode *inode;
  const char       *relpath = NULL;
  int               errcode;
  int               ret;

  /* Find the inode that includes this path */

  inode = inode_find(pathname, &relpath);
  if (inode)
    {
      /* An inode was found that includes this path and possibly refers to a
       * mountpoint.
       */

#ifndef CONFIG_DISABLE_MOUNTPOINT
      /* Check if the inode is a valid mountpoint. */

      if (!INODE_IS_MOUNTPT(inode) || !inode->u.i_mops)
        {
          /* The inode is not a mountpoint */

          errcode = ENXIO;
          goto errout_with_inode;
        }

      /* Perform the mkdir operation using the relative path
       * at the mountpoint.
       */

      if (inode->u.i_mops->mkdir)
        {
          ret = inode->u.i_mops->mkdir(inode, relpath, mode);
          if (ret < 0)
            {
              errcode = -ret;
              goto errout_with_inode;
            }
        }
      else
        {
          errcode = ENOSYS;
          goto errout_with_inode;
        }

      /* Release our reference on the inode */

      inode_release(inode);
#else
      /* But mountpoints are not supported in this configuration */

      errcode = EEXIST;
      goto errout_with_inode;
#endif
    }

#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
  /* No inode exists that contains this path.  Create a new inode in the
   * pseudo-filesystem at this location.
   */

  else
    {
      /* Create an inode in the pseudo-filesystem at this path */

      inode_semtake();
      ret = inode_reserve(pathname, &inode);
      inode_semgive();

      if (ret < 0)
        {
          errcode = -ret;
          goto errout;
        }
    }
#else
  else
    {
예제 #16
0
int sem_unlink(FAR const char *name)
{
  FAR struct inode *inode;
  FAR const char *relpath = NULL;
  char fullpath[MAX_SEMPATH];
  int errcode;
  int ret;

  /* Get the full path to the semaphore */

  snprintf(fullpath, MAX_SEMPATH, CONFIG_FS_NAMED_SEMPATH "/%s", name);

  /* Get the inode for this semaphore. */

  sched_lock();
  inode = inode_find(fullpath, &relpath);
  if (!inode)
    {
      /* There is no inode that includes in this path */

      errcode = ENOENT;
      goto errout;
    }

  /* Verify that what we found is, indeed, a semaphore */

  if (!INODE_IS_NAMEDSEM(inode))
    {
      errcode = ENXIO;
      goto errout_with_inode;
    }

  /* Refuse to unlink the inode if it has children.  I.e., if it is
   * functioning as a directory and the directory is not empty.
   */

  inode_semtake();
  if (inode->i_child != NULL)
    {
      errcode = ENOTEMPTY;
      goto errout_with_semaphore;
    }

  /* Remove the old inode from the tree.  Because we hold a reference count
   * on the inode, it will not be deleted now.  This will set the
   * FSNODEFLAG_DELETED bit in the inode flags.
   */

  ret = inode_remove(fullpath);

  /* inode_remove() should always fail with -EBUSY because we hae a reference
   * on the inode.  -EBUSY means taht the inode was, indeed, unlinked but
   * thatis could not be freed because there are refrences.
   */

  DEBUGASSERT(ret >= 0 || ret == -EBUSY);
  UNUSED(ret);

  /* Now we do not release the reference count in the normal way (by calling
   * inode release.  Rather, we call sem_close().  sem_close will decrement
   * the reference count on the inode.  But it will also free the semaphore
   * if that reference count decrements to zero.  Since we hold one reference,
   * that can only occur if the semaphore is not in-use.
   */

  inode_semgive();
  ret = sem_close((FAR sem_t *)inode->u.i_nsem);
  sched_unlock();
  return ret;

errout_with_semaphore:
  inode_semgive();
errout_with_inode:
  inode_release(inode);
errout:
  set_errno(errcode);
  sched_unlock();
  return ERROR;
}
예제 #17
0
int umount(const char *target)
{
  FAR struct inode *mountpt_inode;
  FAR struct inode *blkdrvr_inode = NULL;
  int errcode = OK;
  int status;

  /* Verify required pointer arguments */

  if (!target)
    {
      errcode = EFAULT;
      goto errout;
    }

  /* Find the mountpt */

  mountpt_inode = inode_find(target, NULL);
  if (!mountpt_inode)
    {
      errcode = ENOENT;
      goto errout;
    }

  /* Verify that the inode is a mountpoint */

  if (!INODE_IS_MOUNTPT(mountpt_inode))
    {
      errcode = EINVAL;
      goto errout_with_mountpt;
    }

  /* Unbind the block driver from the file system (destroying any fs
   * private data.
   */

  if (!mountpt_inode->u.i_mops->unbind)
    {
      /* The filesystem does not support the unbind operation ??? */

      errcode = EINVAL;
      goto errout_with_mountpt;
    }

  /* The unbind method returns the number of references to the
   * filesystem (i.e., open files), zero if the unbind was
   * performed, or a negated error code on a failure.
   */

  inode_semtake(); /* Hold the semaphore through the unbind logic */
  status = mountpt_inode->u.i_mops->unbind( mountpt_inode->i_private, &blkdrvr_inode);
  if (status < 0)
    {
      /* The inode is unhappy with the blkdrvr for some reason */

      errcode = -status;
      goto errout_with_semaphore;
    }
  else if (status > 0)
    {
      errcode = EBUSY;
      goto errout_with_semaphore;
    }

  /* Successfully unbound */

  mountpt_inode->i_private = NULL;

  /* Successfully unbound, remove the mountpoint inode from
   * the inode tree.  The inode will not be deleted yet because
   * there is still at least reference on it (from the mount)
   */

  status = inode_remove(target);
  inode_semgive();

  /* The return value of -EBUSY is normal (in fact, it should
   * not be OK)
   */

  if (status != OK && status != -EBUSY)
    {
      errcode = -status;
      goto errout_with_mountpt;
    }

  /* Release the mountpoint inode and any block driver inode
   * returned by the file system unbind above.  This should cause
   * the inode to be deleted (unless there are other references)
   */

  inode_release(mountpt_inode);

  /* Did the unbind method return a contained block driver */

  if (blkdrvr_inode)
    {
      inode_release(blkdrvr_inode);
    }

  return OK;

  /* A lot of goto's!  But they make the error handling much simpler */

errout_with_semaphore:
  inode_semgive();
errout_with_mountpt:
  inode_release(mountpt_inode);
  if (blkdrvr_inode)
    {
      inode_release(blkdrvr_inode);
    }
errout:
  set_errno(errcode);
  return ERROR;
}
예제 #18
0
int unlink(FAR const char *pathname)
{
  FAR struct inode *inode;
  const char       *relpath = NULL;
  int               errcode;
  int               ret;

  /* Get an inode for this file */

  inode = inode_find(pathname, &relpath);
  if (!inode)
    {
      /* There is no inode that includes in this path */

      errcode = ENOENT;
      goto errout;
    }

#ifndef CONFIG_DISABLE_MOUNTPOINT
  /* Check if the inode is a valid mountpoint. */

  if (INODE_IS_MOUNTPT(inode) && inode->u.i_mops)
    {
      /* Perform the unlink operation using the relative path at the
       * mountpoint.
       */

      if (inode->u.i_mops->unlink)
        {
          ret = inode->u.i_mops->unlink(inode, relpath);
          if (ret < 0)
            {
              errcode = -ret;
              goto errout_with_inode;
            }
        }
      else
        {
          errcode = ENOSYS;
          goto errout_with_inode;
        }
    }
  else
#endif

#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
  /* If this is a "dangling" pseudo-file node (i.e., it has operations) then rm
   * should remove the node.
   */

  if (!INODE_IS_SPECIAL(inode) && inode->u.i_ops)
    {
      /* If this is a pseudo-file node (i.e., it has no operations)
       * then rmdir should remove the node.
       */

      if (inode->u.i_ops)
        {
          inode_semtake();

          /* Refuse to unlink the inode if it has children.  I.e., if it is
           * functioning as a directory and the directory is not empty.
           */

          if (inode->i_child != NULL)
            {
              errcode = ENOTEMPTY;
              inode_semgive();
              goto errout_with_inode;
            }

          /* Remove the old inode.  Because we hold a reference count on the
           * inode, it will not be deleted now.  It will be deleted when all
           * of the references to to the inode have been released (perhaps
           * when inode_release() is called below).  inode_remove() will
           * return -EBUSY to indicate that the inode was not deleted now.
           */

          ret = inode_remove(pathname);
          inode_semgive();

          if (ret < 0 && ret != -EBUSY)
            {
              errcode = -ret;
              goto errout_with_inode;
            }
        }
      else
        {
          errcode = EISDIR;
          goto errout_with_inode;
        }
    }
  else
#endif
    {
      errcode = ENXIO;
      goto errout_with_inode;
    }

  /* Successfully unlinked */

  inode_release(inode);
  return OK;

 errout_with_inode:
  inode_release(inode);
 errout:
  set_errno(errcode);
  return ERROR;
}
예제 #19
0
int open(const char *path, int oflags, ...)
{
  FAR struct file *filep;
  FAR struct inode *inode;
  FAR const char *relpath = NULL;
#if defined(CONFIG_FILE_MODE) || !defined(CONFIG_DISABLE_MOUNTPOINT)
  mode_t mode = 0666;
#endif
  int ret;
  int fd;

#ifdef CONFIG_FILE_MODE
#  ifdef CONFIG_CPP_HAVE_WARNING
#    warning "File creation not implemented"
#  endif

  /* If the file is opened for creation, then get the mode bits */

  if ((oflags & (O_WRONLY | O_CREAT)) != 0)
    {
      va_list ap;
      va_start(ap, oflags);
      mode = va_arg(ap, mode_t);
      va_end(ap);
    }
#endif

  /* Get an inode for this file */

  inode = inode_find(path, &relpath);
  if (!inode)
    {
      /* "O_CREAT is not set and the named file does not exist.  Or, a
       * directory component in pathname does not exist or is a dangling
       * symbolic link."
       */

      ret = ENOENT;
      goto errout;
    }

#if !defined(CONFIG_DISABLE_PSEUDOFS_OPERATIONS) && \
    !defined(CONFIG_DISABLE_MOUNTPOINT)
   /* If the inode is block driver, then we may return a character driver
    * proxy for the block driver.  block_proxy() will instantiate a BCH
    * character driver wrapper around the block driver, open(), then
    * unlink() the character driver.  On success, block_proxy() will
    * return the file descriptor of the opened character driver.
    *
    * NOTE: This will recurse to open the character driver proxy.
    */

   if (INODE_IS_BLOCK(inode))
     {
       /* Release the inode reference */

       inode_release(inode);

       /* Get the file descriptor of the opened character driver proxy */

       fd = block_proxy(path, oflags);
       if (fd < 0)
         {
           ret = fd;
           goto errout;
         }

       /* Return the file descriptor */

       return fd;
     }
   else
#endif

  /* Verify that the inode is either a "normal" character driver or a
   * mountpoint.  We specifically "special" inodes (semaphores, message
   * queues, shared memory).
   */

#ifndef CONFIG_DISABLE_MOUNTPOINT
  if ((!INODE_IS_DRIVER(inode) && !INODE_IS_MOUNTPT(inode)) || !inode->u.i_ops)
#else
  if (!INODE_IS_DRIVER(inode) || !inode->u.i_ops)
#endif
    {
      ret = ENXIO;
      goto errout_with_inode;
    }

  /* Make sure that the inode supports the requested access */

  ret = inode_checkflags(inode, oflags);
  if (ret < 0)
    {
      ret = -ret;
      goto errout_with_inode;
    }

  /* Associate the inode with a file structure */

  fd = files_allocate(inode, oflags, 0, 0);
  if (fd < 0)
    {
      ret = EMFILE;
      goto errout_with_inode;
    }

  /* Get the file structure corresponding to the file descriptor. */

  filep = fs_getfilep(fd);
  if (!filep)
    {
      /* The errno value has already been set */

      return ERROR;
    }

  /* Perform the driver open operation.  NOTE that the open method may be
   * called many times.  The driver/mountpoint logic should handled this
   * because it may also be closed that many times.
   */

  ret = OK;
  if (inode->u.i_ops->open)
    {
#ifndef CONFIG_DISABLE_MOUNTPOINT
      if (INODE_IS_MOUNTPT(inode))
        {
          ret = inode->u.i_mops->open(filep, relpath, oflags, mode);
        }
      else
#endif
        {
          ret = inode->u.i_ops->open(filep);
        }
    }

  if (ret < 0)
    {
      ret = -ret;
      goto errout_with_fd;
    }

  return fd;

errout_with_fd:
  files_release(fd);
errout_with_inode:
  inode_release(inode);
errout:
  set_errno(ret);
  return ERROR;
}