fsal_unlink.c

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/*
 * vim:expandtab:shiftwidth=4:tabstop=4:
 */

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

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

fsal_status_t LUSTREFSAL_unlink(fsal_handle_t * p_parent_directory_handle,        /* IN */
                                fsal_name_t * p_object_name,    /* IN */
                                fsal_op_context_t * p_context,    /* IN */
                                fsal_attrib_list_t * p_parent_directory_attributes      /* [IN/OUT ] */
    )
{

  fsal_status_t status;
  int rc, errsv;
  struct stat buffstat, buffstat_parent;
  fsal_path_t fsalpath;

  /* sanity checks. */
  if(!p_parent_directory_handle || !p_context || !p_object_name)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_unlink);

  /* build the FID path */
  status = fsal_internal_Handle2FidPath(p_context, p_parent_directory_handle, &fsalpath);
  if(FSAL_IS_ERROR(status))
    ReturnStatus(status, INDEX_FSAL_unlink);

  /* get directory metadata */
  TakeTokenFSCall();
  rc = lstat(fsalpath.path, &buffstat_parent);
  errsv = errno;
  ReleaseTokenFSCall();
  if(rc)
    {
      if(errsv == ENOENT)
        Return(ERR_FSAL_STALE, errsv, INDEX_FSAL_unlink);
      else
        Return(posix2fsal_error(errsv), errsv, INDEX_FSAL_unlink);
    }

  /* build the child path */
  status = fsal_internal_appendNameToPath(&fsalpath, p_object_name);
  if(FSAL_IS_ERROR(status))
    ReturnStatus(status, INDEX_FSAL_unlink);

  /* get file metadata */
  TakeTokenFSCall();
  rc = lstat(fsalpath.path, &buffstat);
  errsv = errno;
  ReleaseTokenFSCall();
  if(rc)
    Return(posix2fsal_error(errsv), errsv, INDEX_FSAL_unlink);

  /* check access rights */

  /* Sticky bit on the directory => the user who wants to delete the file must own it or its parent dir */
  if((buffstat_parent.st_mode & S_ISVTX)
     && buffstat_parent.st_uid != p_context->credential.user
     && buffstat.st_uid != p_context->credential.user && p_context->credential.user != 0)
    {
      Return(ERR_FSAL_ACCESS, 0, INDEX_FSAL_unlink);
    }

  /* client must be able to lookup the parent directory and modify it */
  status =
      fsal_internal_testAccess(p_context, FSAL_W_OK | FSAL_X_OK, &buffstat_parent, NULL);
  if(FSAL_IS_ERROR(status))
    ReturnStatus(status, INDEX_FSAL_unlink);

  /******************************
   * DELETE FROM THE FILESYSTEM *
   ******************************/
  TakeTokenFSCall();
  /* If the object to delete is a directory, use 'rmdir' to delete the object, else use 'unlink' */
  rc = (S_ISDIR(buffstat.st_mode)) ? rmdir(fsalpath.path) : unlink(fsalpath.path);
  errsv = errno;
  ReleaseTokenFSCall();
  if(rc)
    Return(posix2fsal_error(errsv), errsv, INDEX_FSAL_unlink);

  /***********************
   * FILL THE ATTRIBUTES *
   ***********************/

  if(p_parent_directory_attributes)
    {
      status =
          LUSTREFSAL_getattrs(p_parent_directory_handle, p_context,
                              p_parent_directory_attributes);
      if(FSAL_IS_ERROR(status))
        {
          FSAL_CLEAR_MASK(p_parent_directory_attributes->asked_attributes);
          FSAL_SET_MASK(p_parent_directory_attributes->asked_attributes,
                        FSAL_ATTR_RDATTR_ERR);
        }
    }
  /* OK */
  Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_unlink);

}