fsal_access.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"
#include "fsal_common.h"

fsal_status_t ZFSFSAL_access(fsal_handle_t * obj_handle,        /* IN */
                             fsal_op_context_t * p_context,        /* IN */
                             fsal_accessflags_t access_type,       /* IN */
                             fsal_attrib_list_t * object_attributes        /* [ IN/OUT ] */
    )
{
  creden_t cred;
  zfsfsal_handle_t * object_handle = (zfsfsal_handle_t *)obj_handle;

  /* sanity checks.
   * note : object_attributes is optional in FSAL_access.
   */
  if(!object_handle || !p_context)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_access);

  /* Get the right VFS */
  ZFSFSAL_VFS_RDLock();
  libzfswrap_vfs_t *p_vfs = ZFSFSAL_GetVFS(object_handle);
  if(!p_vfs)
  {
    ZFSFSAL_VFS_Unlock();
    Return(ERR_FSAL_NOENT, 0, INDEX_FSAL_access);
  }

  /* >> convert your fsal access type to your FS access type << */
  int mask = fsal2posix_testperm(access_type);
  cred.uid = p_context->credential.user;
  cred.gid = p_context->credential.group;
  TakeTokenFSCall();
  int rc = libzfswrap_access(p_vfs, &cred,
                             object_handle->data.zfs_handle, mask);
  ReleaseTokenFSCall();
  ZFSFSAL_VFS_Unlock();

  /* >> convert the returned code, an return it on error << */
  if(rc)
    Return(posix2fsal_error(rc),0, INDEX_FSAL_access);

  /* get attributes if object_attributes is not null.
   * If an error occures during getattr operation,
   * an error bit is set in the output structure.
   */
  if(object_attributes)
    {
      fsal_status_t status;

      status = ZFSFSAL_getattrs(object_handle, p_context, object_attributes);

      /* on error, we set a special bit in the mask. */
      if(FSAL_IS_ERROR(status))
        {
          FSAL_CLEAR_MASK(object_attributes->asked_attributes);
          FSAL_SET_MASK(object_attributes->asked_attributes, FSAL_ATTR_RDATTR_ERR);
        }
    }

  Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_access);
}