fsal_tools.c

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

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

#include "fsal.h"
#include "fsal_convert.h"
#include "fsal_internal.h"
#include "config_parsing.h"
#include <string.h>

/* case unsensitivity */
#define STRCMP   strcasecmp

char *LUSTREFSAL_GetFSName()
{
  return "LUSTRE";
}

int LUSTREFSAL_handlecmp(fsal_handle_t * handle_1, fsal_handle_t * handle_2,
                         fsal_status_t * status)
{
  lustrefsal_handle_t * handle1 = (lustrefsal_handle_t *)handle_1;
  lustrefsal_handle_t * handle2 = (lustrefsal_handle_t *)handle_2;

  *status = FSAL_STATUS_NO_ERROR;

  if(!handle1 || !handle2)
    {
      status->major = ERR_FSAL_FAULT;
      return -1;
    }

  return (handle1->data.fid.f_seq != handle2->data.fid.f_seq)
      || (handle1->data.fid.f_oid != handle2->data.fid.f_oid)
      || (handle1->data.fid.f_ver != handle2->data.fid.f_ver);

}

unsigned int LUSTREFSAL_Handle_to_HashIndex(fsal_handle_t *handle,
                                            unsigned int cookie,
                                            unsigned int alphabet_len,
                                            unsigned int index_size)
{
  unsigned long long lval;
  lustrefsal_handle_t * p_handle = (lustrefsal_handle_t *)handle;

  /* polynom of prime numbers */
  lval = 3 * cookie * alphabet_len + 1873 * p_handle->data.fid.f_seq
      + 3511 * p_handle->data.fid.f_oid + 2999 * p_handle->data.fid.f_ver + 10267;

  return lval % index_size;
}

/*
 * FSAL_Handle_to_RBTIndex
 * This function is used for generating a RBT node ID
 * in order to identify entries into the RBT.
 *
 * \param p_handle      The handle to be hashed
 * \param cookie        Makes it possible to have different hash value for the
 *                      same handle, when cookie changes.
 *
 * \return The hash value
 */

unsigned int LUSTREFSAL_Handle_to_RBTIndex(fsal_handle_t *handle,
                                           unsigned int cookie)
{
  unsigned long long lval;
  lustrefsal_handle_t * p_handle = (lustrefsal_handle_t *)handle;

  /* polynom of prime numbers */
  lval = 2239 * cookie + 3559 * p_handle->data.fid.f_seq + 5 * p_handle->data.fid.f_oid
      + 1409 * p_handle->data.fid.f_ver + 20011;

  return high32m(lval) ^ low32m(lval);
}

fsal_status_t LUSTREFSAL_DigestHandle(fsal_export_context_t * exp_context,     /* IN */
                                      fsal_digesttype_t output_type,       /* IN */
                                      fsal_handle_t *in_fsal_handle, /* IN */
                                      struct fsal_handle_desc *fh_desc     /* IN/OUT */ )
{
  unsigned int ino32;
  lustrefsal_export_context_t * p_expcontext = (lustrefsal_export_context_t *)exp_context;
  lustrefsal_handle_t * p_in_fsal_handle = (lustrefsal_handle_t *)in_fsal_handle;
  size_t fh_size;

  /* sanity checks */
  if(!p_in_fsal_handle || !fh_desc || !fh_desc->start || !p_expcontext)
    ReturnCode(ERR_FSAL_FAULT, 0);

  switch (output_type)
    {

    /* NFS handle digest */
    case FSAL_DIGEST_NFSV2:
    case FSAL_DIGEST_NFSV3:
    case FSAL_DIGEST_NFSV4:
      fh_size = sizeof(p_in_fsal_handle->data) ;
      if(fh_desc->len < fh_size)
        {
               LogMajor( COMPONENT_FSAL,
                             "LUSTRE DigestHandle: space too small for handle.  need %lu, have %lu",
                             fh_size, fh_desc->len);
               ReturnCode(ERR_FSAL_TOOSMALL, 0);
            }
      memcpy(fh_desc->start, (caddr_t)p_in_fsal_handle, fh_size);
      fh_desc->len = fh_size;
      break;

      /* FileId digest for NFSv2 */
    case FSAL_DIGEST_FILEID2:

      ino32 = low32m(p_in_fsal_handle->data.inode);

      memset(fh_desc->start, 0, FSAL_DIGEST_SIZE_FILEID2);
      memcpy(fh_desc->start, &ino32, sizeof( ino32 ));
      fh_desc->len = FSAL_DIGEST_SIZE_FILEID2; 
      break;

      /* FileId digest for NFSv3 */
    case FSAL_DIGEST_FILEID3:
      memset(fh_desc->start, 0, FSAL_DIGEST_SIZE_FILEID3);
      memcpy(fh_desc->start, &(p_in_fsal_handle->data.inode), sizeof(fsal_u64_t));
      fh_desc->len = FSAL_DIGEST_SIZE_FILEID3;
      break;

      /* FileId digest for NFSv4 */
    case FSAL_DIGEST_FILEID4:
      memset(fh_desc->start, 0, FSAL_DIGEST_SIZE_FILEID4);
      memcpy(fh_desc->start, &(p_in_fsal_handle->data.inode), sizeof(fsal_u64_t));
      fh_desc->len = FSAL_DIGEST_SIZE_FILEID4;
      break;

    default:
      ReturnCode(ERR_FSAL_SERVERFAULT, 0);

    }

  ReturnCode(ERR_FSAL_NO_ERROR, 0);

}

fsal_status_t LUSTREFSAL_ExpandHandle(fsal_export_context_t * pexpcontext,     /* IN not used */
                                   fsal_digesttype_t in_type,   /* IN */
                                   struct fsal_handle_desc *fh_desc  /* IN/OUT */ )
{
  lustrefsal_export_context_t * p_expcontext = (lustrefsal_export_context_t *)pexpcontext;
  lustrefsal_handle_t dummy_handle ;
  size_t fh_size;

  /* sanity checks */
  if(!fh_desc || !fh_desc->start || !p_expcontext)
    ReturnCode(ERR_FSAL_FAULT, 0);

  fh_size = sizeof( dummy_handle.data ); /* All LUSTRE handle have the same size */
  if(in_type == FSAL_DIGEST_NFSV2)
    {
      if(fh_desc->len < fh_size)
        {
          LogMajor(COMPONENT_FSAL,
                   "LUSTRE ExpandHandle: V2 size too small for handle.  should be %lu, got %lu",
                   fh_size, fh_desc->len);
          ReturnCode(ERR_FSAL_SERVERFAULT, 0);
        }
    }
  else if(in_type != FSAL_DIGEST_SIZEOF && fh_desc->len != fh_size)
    {
      LogMajor(COMPONENT_FSAL,
               "LUSTRE ExpandHandle: size mismatch for handle.  should be %lu, got %lu",
               fh_size, fh_desc->len);
      ReturnCode(ERR_FSAL_SERVERFAULT, 0);
    }
  fh_desc->len = fh_size;  /* pass back the actual size */
  ReturnCode(ERR_FSAL_NO_ERROR, 0);
}

fsal_status_t LUSTREFSAL_SetDefault_FS_specific_parameter(fsal_parameter_t *
                                                          out_parameter)
{
  /* defensive programming... */
  if(out_parameter == NULL)
    ReturnCode(ERR_FSAL_FAULT, 0);

  /* set default values for all parameters of fs_specific_info */

#ifdef _USE_PGSQL

  /* pgsql db */
  strcpy(out_parameter->fs_specific_info.dbparams.host, "localhost");
  strcpy(out_parameter->fs_specific_info.dbparams.port, "5432");
  out_parameter->fs_specific_info.dbparams.dbname[0] = '\0';
  out_parameter->fs_specific_info.dbparams.login[0] = '\0';
  out_parameter->fs_specific_info.dbparams.passwdfile[0] = '\0';

#elif defined(_USE_MYSQL)

  strcpy(out_parameter->fs_specific_info.dbparams.host, "localhost");
  strcpy(out_parameter->fs_specific_info.dbparams.port, "");
  out_parameter->fs_specific_info.dbparams.dbname[0] = '\0';
  out_parameter->fs_specific_info.dbparams.login[0] = '\0';
  out_parameter->fs_specific_info.dbparams.passwdfile[0] = '\0';

#endif

  ReturnCode(ERR_FSAL_NO_ERROR, 0);

}

/* load specific filesystem configuration options */

fsal_status_t LUSTREFSAL_load_FS_specific_parameter_from_conf(config_file_t in_config,
                                                              fsal_parameter_t *
                                                              out_parameter)
{

  ReturnCode(ERR_FSAL_NO_ERROR, 0);

}                               /* FSAL_load_FS_specific_parameter_from_conf */