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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5BTcache.c
* Mar 10 2005
* Quincey Koziol <koziol@ncsa.uiuc.edu>
*
* Purpose: Implement block tracker metadata cache methods.
*
*-------------------------------------------------------------------------
*/
#define H5BT_PACKAGE /*suppress error about including H5B2pkg */
/* Private headers */
#include "H5private.h" /* Generic Functions */
#include "H5BTpkg.h" /* Block tracker */
#include "H5Eprivate.h" /* Error handling */
/* Local macros */
/* Block tracker format version #'s */
#define H5BT_VERSION 0
/* Local typedefs */
/* Local prototypes */
/* Metadata cache callbacks */
static H5BT_t *H5BT_cache_load(H5F_t *f, hid_t dxpl_id, haddr_t addr, const void *_type, void *udata);
static herr_t H5BT_cache_flush(H5F_t *f, hid_t dxpl_id, hbool_t destroy, haddr_t addr, H5BT_t *b);
static herr_t H5BT_cache_clear(H5F_t *f, H5BT_t *b, hbool_t destroy);
static herr_t H5BT_cache_size(const H5F_t *f, const H5BT_t *bt, size_t *size_ptr);
/* Package variables */
/* H5BT inherits cache-like properties from H5AC */
const H5AC_class_t H5AC_BLTR[1] = {{
H5AC_BLTR_ID,
(H5AC_load_func_t)H5BT_cache_load,
(H5AC_flush_func_t)H5BT_cache_flush,
(H5AC_dest_func_t)H5BT_cache_dest,
(H5AC_clear_func_t)H5BT_cache_clear,
(H5AC_size_func_t)H5BT_cache_size,
}};
/* Static variables */
/* Declare a free list to manage block tracker data to/from disk */
H5FL_BLK_DEFINE_STATIC(info_block);
/*-------------------------------------------------------------------------
* Function: H5BT_cache_load
*
* Purpose: Loads block tracker info from the disk.
*
* Return: Success: Pointer to a new block tracker
*
* Failure: NULL
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 10 2005
*
*-------------------------------------------------------------------------
*/
static H5BT_t *
H5BT_cache_load(H5F_t *f, hid_t dxpl_id, haddr_t addr, const void UNUSED *udata1, void UNUSED *udata2)
{
H5BT_t *bt = NULL;
size_t size;
uint8_t *buf = NULL;
uint8_t *p; /* Pointer into raw data buffer */
H5BT_t *ret_value;
FUNC_ENTER_NOAPI(H5BT_cache_load, NULL)
/* Check arguments */
HDassert(f);
HDassert(H5F_addr_defined(addr));
if (NULL==(bt = H5FL_MALLOC(H5BT_t)))
HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
HDmemset(&bt->cache_info,0,sizeof(H5AC_info_t));
/* Compute the size of the B-tree header on disk */
size = H5BT_SIZE(f);
/* Allocate temporary buffer */
if ((buf=H5FL_BLK_MALLOC(info_block,size))==NULL)
HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
/* Read header from disk */
if (H5F_block_read(f, H5FD_MEM_BLKTRK, addr, size, dxpl_id, buf)<0)
HGOTO_ERROR(H5E_BLKTRK, H5E_READERROR, NULL, "can't read block tracker info")
p = buf;
/* magic number */
if (HDmemcmp(p, H5BT_MAGIC, H5BT_SIZEOF_MAGIC))
HGOTO_ERROR(H5E_BLKTRK, H5E_CANTLOAD, NULL, "wrong block tracker info signature")
p += H5BT_SIZEOF_MAGIC;
/* version */
if (*p++ != H5BT_VERSION)
HGOTO_ERROR(H5E_BLKTRK, H5E_CANTLOAD, NULL, "wrong block tracker info version")
/* Size status information */
bt->status = *p++;
/* Max. block size info */
H5F_DECODE_LENGTH(f, p, bt->max_block_size);
UINT32DECODE(p, bt->max_block_cnt);
/* Min. block size info */
H5F_DECODE_LENGTH(f, p, bt->min_block_size);
UINT32DECODE(p, bt->min_block_cnt);
/* Total size of all blocks tracked */
H5F_DECODE_LENGTH(f, p, bt->tot_block_size);
/* Address of B-tree for blocks */
H5F_addr_decode(f, (const uint8_t **)&p, &(bt->bt2_addr));
/* Set return value */
ret_value = bt;
done:
if(buf)
H5FL_BLK_FREE(info_block,buf);
if (!ret_value && bt)
(void)H5BT_cache_dest(f,bt);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5BT_cache_load() */
/*-------------------------------------------------------------------------
* Function: H5BT_cache_flush
*
* Purpose: Flushes dirty block tracker info to disk.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 10 2005
*
*-------------------------------------------------------------------------
*/
static herr_t
H5BT_cache_flush(H5F_t *f, hid_t dxpl_id, hbool_t destroy, haddr_t addr, H5BT_t *bt)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5BT_cache_flush, FAIL)
/* check arguments */
HDassert(f);
HDassert(H5F_addr_defined(addr));
HDassert(bt);
if (bt->cache_info.is_dirty) {
uint8_t *buf = NULL;
uint8_t *p; /* Pointer into raw data buffer */
size_t size;
/* Compute the size of the B-tree header on disk */
size = H5BT_SIZE(f);
/* Allocate temporary buffer */
if ((buf=H5FL_BLK_MALLOC(info_block,size))==NULL)
HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
p = buf;
/* magic number */
HDmemcpy(p, H5BT_MAGIC, H5BT_SIZEOF_MAGIC);
p += H5BT_SIZEOF_MAGIC;
/* version # */
*p++ = H5BT_VERSION;
/* Size status information */
*p++ = bt->status;
/* Max. block size info */
H5F_ENCODE_LENGTH(f, p, bt->max_block_size);
UINT32ENCODE(p, bt->max_block_cnt);
/* Min. block size info */
H5F_ENCODE_LENGTH(f, p, bt->min_block_size);
UINT32ENCODE(p, bt->min_block_cnt);
/* Total size of all blocks tracked */
H5F_ENCODE_LENGTH(f, p, bt->tot_block_size);
/* Address of B-tree for blocks */
H5F_addr_encode(f, &p, bt->bt2_addr);
/* Write the block tracker info. */
if (H5F_block_write(f, H5FD_MEM_BLKTRK, addr, size, dxpl_id, buf) < 0)
HGOTO_ERROR(H5E_BLKTRK, H5E_CANTFLUSH, FAIL, "unable to save block tracker info to disk")
H5FL_BLK_FREE(info_block,buf);
bt->cache_info.is_dirty = FALSE;
} /* end if */
if (destroy)
if (H5BT_cache_dest(f,bt) < 0)
HGOTO_ERROR(H5E_BLKTRK, H5E_CANTFREE, FAIL, "unable to destroy block tracker info")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5BT_cache_flush() */
/*-------------------------------------------------------------------------
* Function: H5B_cache_dest
*
* Purpose: Destroys a block tracker in memory.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 10 2005
*
*-------------------------------------------------------------------------
*/
/* ARGSUSED */
herr_t
H5BT_cache_dest(H5F_t UNUSED *f, H5BT_t *bt)
{
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5BT_cache_dest)
/*
* Check arguments.
*/
HDassert(bt);
/* Free block tracker info */
H5FL_FREE(H5BT_t,bt);
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5BT_cache_dest() */
/*-------------------------------------------------------------------------
* Function: H5BT_cache_clear
*
* Purpose: Mark a block tracker info in memory as non-dirty.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 10 2005
*
*-------------------------------------------------------------------------
*/
static herr_t
H5BT_cache_clear(H5F_t *f, H5BT_t *bt, hbool_t destroy)
{
herr_t ret_value = SUCCEED;
FUNC_ENTER_NOAPI_NOINIT(H5BT_cache_clear)
/*
* Check arguments.
*/
HDassert(bt);
/* Reset the dirty flag. */
bt->cache_info.is_dirty = FALSE;
if (destroy)
if (H5BT_cache_dest(f, bt) < 0)
HGOTO_ERROR(H5E_BLKTRK, H5E_CANTFREE, FAIL, "unable to destroy block tracker info")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5BT_cache_clear() */
/*-------------------------------------------------------------------------
* Function: H5BT_cache_size
*
* Purpose: Compute the size in bytes of a block tracker info
* on disk, and return it in *size_ptr. On failure,
* the value of *size_ptr is undefined.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 10 2005
*
*-------------------------------------------------------------------------
*/
static herr_t
H5BT_cache_size(const H5F_t *f, const H5BT_t UNUSED *bt, size_t *size_ptr)
{
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5BT_cache_size)
/* check arguments */
HDassert(f);
HDassert(size_ptr);
/* Set size value */
*size_ptr = H5BT_SIZE(f);
FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5BT_cache_size() */
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