cache_inode_truncate.c

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/*
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 * Copyright CEA/DAM/DIF  (2008)
 * contributeur : Philippe DENIEL   philippe.deniel@cea.fr
 *                Thomas LEIBOVICI  thomas.leibovici@cea.fr
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * ---------------------------------------
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef _SOLARIS
#include "solaris_port.h"
#endif                          /* _SOLARIS */

#include "fsal.h"
#include "log.h"
#include "HashData.h"
#include "HashTable.h"
#include "cache_inode.h"

#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <time.h>
#include <pthread.h>
#include <assert.h>

cache_inode_status_t
cache_inode_truncate_impl(cache_entry_t *entry,
                          fsal_size_t length,
                          fsal_attrib_list_t *attr,
                          fsal_op_context_t *context,
                          cache_inode_status_t *status)
{
  fsal_status_t fsal_status;
  fsal_file_t *fd;

  /* Set the return default to CACHE_INODE_SUCCESS */
  *status = CACHE_INODE_SUCCESS;

  /* Only regular files can be truncated */
  if(entry->type != REGULAR_FILE)
    {
      *status = CACHE_INODE_BAD_TYPE;
      return *status;
    }

  /* Call FSAL to actually truncate */
  entry->attributes.asked_attributes = cache_inode_params.attrmask;
  if (entry->object.file.open_fd.openflags == FSAL_O_CLOSED)
    fd = NULL;
  else
    fd = &(entry->object.file.open_fd.fd);
  fsal_status = FSAL_truncate(&entry->handle, context, length,
                              fd, /* used by FSAL_GPFS */
                              &entry->attributes);

  if(FSAL_IS_ERROR(fsal_status))
    {
      *status = cache_inode_error_convert(fsal_status);
      if (fsal_status.major == ERR_FSAL_STALE) {
        cache_inode_kill_entry(entry);
      }
      return *status;
    }

  /* Returns the attributes */
  *attr = entry->attributes;

  return *status;
}                               /* cache_inode_truncate_sw */

cache_inode_status_t
cache_inode_truncate(cache_entry_t *entry,
                     fsal_size_t length,
                     fsal_attrib_list_t *attr,
                     fsal_op_context_t *context,
                     cache_inode_status_t *status)
{
  cache_inode_status_t ret;
  pthread_rwlock_wrlock(&entry->attr_lock);
  pthread_rwlock_wrlock(&entry->content_lock);
  ret = cache_inode_truncate_impl(entry,
                                  length, attr, context, status);
  pthread_rwlock_unlock(&entry->attr_lock);
  pthread_rwlock_unlock(&entry->content_lock);
  return ret;
} /* cache_inode_truncate */