fsal_unlink.c

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/*
 * vim:expandtab:shiftwidth=8:tabstop=8:
 */

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

#include "fsal.h"
#include "fsal_internal.h"
#include "fsal_convert.h"

fsal_status_t ZFSFSAL_unlink(fsal_handle_t * parentdir_handle,     /* IN */
                          fsal_name_t * p_object_name,  /* IN */
                          fsal_op_context_t * p_context,        /* IN */
                          fsal_attrib_list_t * parentdir_attributes     /* [IN/OUT ] */
    )
{

  fsal_status_t st;
  int rc, type;
  inogen_t object;
  creden_t cred;

  /* sanity checks.
   * note : parentdir_attributes are optional.
   *        parentdir_handle is mandatory,
   *        because, we do not allow to delete FS root !
   */
  if(!parentdir_handle || !p_context || !p_object_name)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_unlink);

  /* Hook to prevent removing anything from snapshots */
  if(((zfsfsal_handle_t *)parentdir_handle)->data.i_snap != 0)
  {
    LogDebug(COMPONENT_FSAL, "Trying to remove an object from a snapshot");
    Return(ERR_FSAL_ROFS, 0, INDEX_FSAL_unlink);
  }

  cred.uid = p_context->credential.user;
  cred.gid = p_context->credential.group;

  TakeTokenFSCall();

  if(!(rc = libzfswrap_lookup(((zfsfsal_op_context_t *)p_context)->export_context->p_vfs, &cred,
                              ((zfsfsal_handle_t *)parentdir_handle)->data.zfs_handle,
                              p_object_name->name, &object, &type)))
  {
    if(type == S_IFDIR)
      rc = libzfswrap_rmdir(((zfsfsal_op_context_t *)p_context)->export_context->p_vfs, &cred,
                            ((zfsfsal_handle_t *)parentdir_handle)->data.zfs_handle, p_object_name->name);
    else
      rc = libzfswrap_unlink(((zfsfsal_op_context_t *)p_context)->export_context->p_vfs, &cred,
                             ((zfsfsal_handle_t *)parentdir_handle)->data.zfs_handle, p_object_name->name);
  }

  ReleaseTokenFSCall();

  if(rc)
    Return(posix2fsal_error(rc), 0, INDEX_FSAL_unlink);

  /* >> get post op attributes for the parent, if they are asked,
   * and your filesystem didn't return them << */

  if(parentdir_attributes)
    {

      st = ZFSFSAL_getattrs(parentdir_handle, p_context, parentdir_attributes);

      /* On error, we set a flag in the returned attributes */

      if(FSAL_IS_ERROR(st))
        {
          FSAL_CLEAR_MASK(parentdir_attributes->asked_attributes);
          FSAL_SET_MASK(parentdir_attributes->asked_attributes, FSAL_ATTR_RDATTR_ERR);
        }
    }

  /* OK */
  Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_unlink);

}