mfsl_async_link.c

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/*
 *
 *
 * 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

/* fsal_types contains constants and type definitions for FSAL */
#include "fsal_types.h"
#include "fsal.h"
#include "mfsl_types.h"
#include "mfsl.h"
#include "common_utils.h"

extern mfsl_parameter_t mfsl_param;

fsal_status_t MFSL_link_async_op(mfsl_async_op_desc_t * popasyncdesc)
{
  fsal_status_t fsal_status;

  LogDebug(COMPONENT_MFSL, "Making asynchronous FSAL_link for async op %p",
                  popasyncdesc);

  if(popasyncdesc->op_args.link.pmobject_src !=
     popasyncdesc->op_args.link.pmobject_dirdest)
    {
      P(popasyncdesc->op_args.link.pmobject_src->lock);
      P(popasyncdesc->op_args.link.pmobject_dirdest->lock);
    }
  else
    {
      P(popasyncdesc->op_args.link.pmobject_src->lock);
    }

  fsal_status = FSAL_link(&popasyncdesc->op_args.link.pmobject_src->handle,
                          &popasyncdesc->op_args.link.pmobject_dirdest->handle,
                          &popasyncdesc->op_args.link.name_link,
                          &popasyncdesc->fsal_op_context,
                          &popasyncdesc->op_res.link.attr);

  if(popasyncdesc->op_args.link.pmobject_src !=
     popasyncdesc->op_args.link.pmobject_dirdest)
    {
      V(popasyncdesc->op_args.link.pmobject_src->lock);
      V(popasyncdesc->op_args.link.pmobject_dirdest->lock);
    }
  else
    {
      V(popasyncdesc->op_args.link.pmobject_src->lock);
    }

  return fsal_status;
}                               /* MFSL_link_async_op */

fsal_status_t MFSAL_link_check_perms(mfsl_object_t * target_handle,     /* IN */
                                     mfsl_object_t * dir_handle,        /* IN */
                                     fsal_name_t * p_link_name, /* IN */
                                     mfsl_object_specific_data_t * tgt_pspecdata,       /* IN */
                                     mfsl_object_specific_data_t * dir_pspecdata,       /* IN */
                                     fsal_op_context_t * p_context,     /* IN */
                                     mfsl_context_t * p_mfsl_context /* IN */ )
{
  fsal_status_t fsal_status;

  fsal_status = FSAL_link_access(p_context, &dir_pspecdata->async_attr);

  if(FSAL_IS_ERROR(fsal_status))
    return fsal_status;

  MFSL_return(ERR_FSAL_NO_ERROR, 0);
}                               /* MFSL_link_check_perms */

fsal_status_t MFSL_link(mfsl_object_t * target_handle,  /* IN */
                        mfsl_object_t * dir_handle,     /* IN */
                        fsal_name_t * p_link_name,      /* IN */
                        fsal_op_context_t * p_context,  /* IN */
                        mfsl_context_t * p_mfsl_context,        /* IN */
                        fsal_attrib_list_t * tgt_attributes,    /* [ IN/OUT ] */
                        fsal_attrib_list_t * dir_attributes /* [ IN/OUT ] */ )
{
  fsal_status_t fsal_status;
  mfsl_async_op_desc_t *pasyncopdesc = NULL;
  mfsl_object_specific_data_t *tgt_pasyncdata = NULL;
  mfsl_object_specific_data_t *dir_pasyncdata = NULL;

  P(p_mfsl_context->lock);

  pasyncopdesc = pool_alloc(p_mfsl_context->pool_async_op, NULL);

  V(p_mfsl_context->lock);

  if(pasyncopdesc == NULL)
    MFSL_return(ERR_FSAL_INVAL, 0);

  if(gettimeofday(&pasyncopdesc->op_time, NULL) != 0)
    {
      /* Could'not get time of day... Stopping, this may need a major failure */
      LogMajor(COMPONENT_MFSL, "MFSL_link: cannot get time of day... exiting");
      exit(1);
    }

  if(!mfsl_async_get_specdata(target_handle, &tgt_pasyncdata))
    {
      /* Target is not yet asynchronous */
      P(p_mfsl_context->lock);

      tgt_pasyncdata = pool_alloc(p_mfsl_context->pool_spec_data, NULL);

      V(p_mfsl_context->lock);

      /* In this case use object_attributes parameter to initiate asynchronous object */
      tgt_pasyncdata->async_attr = *tgt_attributes;
    }

  if(!mfsl_async_get_specdata(dir_handle, &dir_pasyncdata))
    {
      /* Target is not yet asynchronous */
      P(p_mfsl_context->lock);

      dir_pasyncdata = pool_alloc(p_mfsl_context->pool_spec_data, NULL);

      V(p_mfsl_context->lock);

      /* In this case use object_attributes parameter to initiate asynchronous object */
      dir_pasyncdata->async_attr = *dir_attributes;
    }

  fsal_status = MFSAL_link_check_perms(target_handle,
                                       dir_handle,
                                       p_link_name,
                                       tgt_pasyncdata,
                                       dir_pasyncdata, p_context, p_mfsl_context);

  if(FSAL_IS_ERROR(fsal_status))
    return fsal_status;

  LogDebug(COMPONENT_MFSL,  "Creating asyncop %p",
                    pasyncopdesc);

  pasyncopdesc->op_type = MFSL_ASYNC_OP_LINK;
  pasyncopdesc->op_args.link.pmobject_src = target_handle;
  pasyncopdesc->op_args.link.pmobject_dirdest = dir_handle;
  pasyncopdesc->op_args.link.name_link = *p_link_name;
  pasyncopdesc->op_res.link.attr = *tgt_attributes;

  pasyncopdesc->op_func = MFSL_link_async_op;
  pasyncopdesc->fsal_op_context = *p_context;

  pasyncopdesc->ptr_mfsl_context = (caddr_t) p_mfsl_context;

  fsal_status = MFSL_async_post(pasyncopdesc);
  if(FSAL_IS_ERROR(fsal_status))
    return fsal_status;

  /* Update the asynchronous metadata */
  tgt_pasyncdata->async_attr.ctime.seconds = pasyncopdesc->op_time.tv_sec;
  tgt_pasyncdata->async_attr.ctime.nseconds = pasyncopdesc->op_time.tv_usec;  
  tgt_pasyncdata->async_attr.numlinks += 1;

  dir_pasyncdata->async_attr.ctime.seconds = pasyncopdesc->op_time.tv_sec;
  dir_pasyncdata->async_attr.ctime.nseconds = pasyncopdesc->op_time.tv_usec;  
  if(!mfsl_async_set_specdata(target_handle, tgt_pasyncdata))
    MFSL_return(ERR_FSAL_SERVERFAULT, 0);

  if(!mfsl_async_set_specdata(dir_handle, dir_pasyncdata))
    MFSL_return(ERR_FSAL_SERVERFAULT, 0);

  target_handle->health = MFSL_ASYNC_ASYNCHRONOUS;
  dir_handle->health = MFSL_ASYNC_ASYNCHRONOUS;

  /* Return the correct attributes */
  *tgt_attributes = tgt_pasyncdata->async_attr;
  *dir_attributes = dir_pasyncdata->async_attr;

  MFSL_return(ERR_FSAL_NO_ERROR, 0);
}                               /* MFSL_link */