fsal_fileop.c

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/*
 * Copyright (C) 2010 The Linx Box Corporation
 * Contributor : Adam C. Emerson
 *
 * Some Portions 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

#include "fsal.h"
#include "fsal_internal.h"
#include "fsal_convert.h"
#include <stdio.h>

fsal_status_t CEPHFSAL_open(fsal_handle_t * exthandle,
                            fsal_op_context_t * extcontext,
                            fsal_openflags_t openflags,
                            fsal_file_t * extdescriptor,
                            fsal_attrib_list_t * file_attributes)
{
  cephfsal_handle_t* handle = (cephfsal_handle_t*) exthandle;
  cephfsal_op_context_t* context = (cephfsal_op_context_t*) extcontext;
  cephfsal_file_t* descriptor = (cephfsal_file_t *) extdescriptor;
  struct ceph_mount_info *cmount = context->export_context->cmount;
  int rc = 0;
  int uid = FSAL_OP_CONTEXT_TO_UID(context);
  int gid = FSAL_OP_CONTEXT_TO_GID(context);
  int posix_flags = 0;
  Fh *desc = NULL;

  /* sanity checks.
   * note : file_attributes is optional.
   */
  if(!handle || !context || !descriptor)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_open);

  rc = fsal2posix_openflags(openflags, &posix_flags);

  /* flags conflicts. */
  if(rc)
    Return(rc, 0, INDEX_FSAL_open);

  TakeTokenFSCall();

  rc = ceph_ll_open(cmount, VINODE(handle), posix_flags, &desc, uid, gid);

  descriptor->fh = desc;
  descriptor->vi = VINODE(handle);
  descriptor->ctx = *context;

  ReleaseTokenFSCall();

  if (rc < 0)
    Return(posix2fsal_error(rc), 0, INDEX_FSAL_open);

  if(file_attributes)
    {
      fsal_status_t status
        = CEPHFSAL_getattrs(exthandle, extcontext, file_attributes);

      if(FSAL_IS_ERROR(status))
        {
          FSAL_CLEAR_MASK(file_attributes->asked_attributes);
          FSAL_SET_MASK(file_attributes->asked_attributes, FSAL_ATTR_RDATTR_ERR);
        }
    }

  Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_open);
}

fsal_status_t CEPHFSAL_open_by_name(fsal_handle_t * exthandle,
                                    fsal_name_t * filename,
                                    fsal_op_context_t * extcontext,
                                    fsal_openflags_t openflags,
                                    fsal_file_t * extdescriptor,
                                    fsal_attrib_list_t * file_attributes)
{
  fsal_status_t fsal_status;
  fsal_handle_t found;

  if(!exthandle || !filename || !extcontext || !extdescriptor)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_open_by_name);

  fsal_status =
    CEPHFSAL_lookup(exthandle, filename, extcontext, &found, file_attributes);

  if(FSAL_IS_ERROR(fsal_status))
    return fsal_status;

  return CEPHFSAL_open(&found, extcontext, openflags, extdescriptor,
                       file_attributes);
}

fsal_status_t CEPHFSAL_read(fsal_file_t * extdescriptor,
                            fsal_seek_t * seek_descriptor,
                            fsal_size_t buffer_size,
                            caddr_t buffer,
                            fsal_size_t * read_amount,
                            fsal_boolean_t * end_of_file)
{
  cephfsal_file_t* descriptor = (cephfsal_file_t*) extdescriptor;
  struct ceph_mount_info *cmount = descriptor->ctx.export_context->cmount;

  int nb_read = 0;
  fsal_off_t offset;

  /* sanity checks. */

  if(!descriptor || !buffer || !read_amount || !end_of_file)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_read);

  if (seek_descriptor)
    {
      if (seek_descriptor->whence != FSAL_SEEK_SET)
        {
          Return(ERR_FSAL_INVAL, 0, INDEX_FSAL_write);
        }
      else
        {
          offset = seek_descriptor->offset;
        }
    }
  else
    {
      offset = 0;
    }

  TakeTokenFSCall();

  nb_read = ceph_ll_read(cmount, FH(descriptor), offset, buffer_size, buffer);

  ReleaseTokenFSCall();

  if (nb_read < 0)
    Return(posix2fsal_error(nb_read), 0, INDEX_FSAL_read);

  if (nb_read < buffer_size)
    *end_of_file = TRUE;
  else
    *end_of_file = FALSE;

  *read_amount = nb_read;

  Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_read);
}

fsal_status_t CEPHFSAL_write(fsal_file_t * extdescriptor,
                             fsal_op_context_t * p_context,
                             fsal_seek_t * seek_descriptor,
                             fsal_size_t buffer_size,
                             caddr_t buffer,
                             fsal_size_t * write_amount)
{
  cephfsal_file_t* descriptor = (cephfsal_file_t*) extdescriptor;
  struct ceph_mount_info *cmount = descriptor->ctx.export_context->cmount;
  int nb_written=0;
  fsal_off_t offset;

  /* sanity checks. */
  if(!descriptor || !buffer || !write_amount)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_write);

  if (seek_descriptor)
    {
      if (seek_descriptor->whence != FSAL_SEEK_SET)
        {
          Return(ERR_FSAL_INVAL, 0, INDEX_FSAL_write);
        }
      else
        {
          offset = seek_descriptor->offset;
        }
    }
  else
    {
      offset = 0;
    }

  TakeTokenFSCall();

  nb_written = ceph_ll_write(cmount, FH(descriptor), offset, buffer_size,
                             buffer);

  ReleaseTokenFSCall();

  if (nb_written < 0)
    Return(posix2fsal_error(nb_written), 0, INDEX_FSAL_write);

  *write_amount = nb_written;

  Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_write);

}

fsal_status_t CEPHFSAL_close(fsal_file_t * extdescriptor)
{
  cephfsal_file_t* descriptor = (cephfsal_file_t*) extdescriptor;
  struct ceph_mount_info *cmount = descriptor->ctx.export_context->cmount;
  int rc = 0;

  /* sanity checks. */
  if(!descriptor)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_close);

  /* This is because of a bug in the cache layer which must be fixed
     later.  Right now, we work around it. */

  if(!FH(descriptor))
    Return(ERR_FSAL_NOT_OPENED, 0, INDEX_FSAL_close);

  TakeTokenFSCall();

  rc = ceph_ll_close(cmount, FH(descriptor));

  ReleaseTokenFSCall();

  FH(descriptor) = NULL;

  if (rc != 0)
    Return(posix2fsal_error(rc), 0, INDEX_FSAL_read);

  Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_close);

}

unsigned int CEPHFSAL_GetFileno(fsal_file_t * pfile)
{
  unsigned int mask=0xFFFFFFFF;
  return (mask & ((uintptr_t) FH((cephfsal_file_t*) pfile)));
}

fsal_status_t CEPHFSAL_commit( fsal_file_t * extdescriptor, 
                             fsal_off_t    offset, 
                             fsal_size_t   length )
{
  cephfsal_file_t* descriptor = (cephfsal_file_t*) extdescriptor;
  struct ceph_mount_info *cmount = descriptor->ctx.export_context->cmount;
  int rc = 0;

  /* sanity checks. */
  if(!extdescriptor)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_commit);

  TakeTokenFSCall();
  if ((rc = ceph_ll_fsync(cmount, FH(descriptor), 0)) < 0)
    {
      Return(posix2fsal_error(rc), 0, INDEX_FSAL_commit);
    }
  ReleaseTokenFSCall();

  Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_commit);
}