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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: H5BT.c
* Mar 9 2005
* Quincey Koziol <koziol@ncsa.uiuc.edu>
*
* Purpose: Tracks blocks of bytes in a file
*
*-------------------------------------------------------------------------
*/
#define H5BT_PACKAGE /*suppress error about including H5BTpkg */
/* Private headers */
#include "H5private.h" /* Generic Functions */
#include "H5BTpkg.h" /* Block tracker */
#include "H5Eprivate.h" /* Error handling */
#include "H5MFprivate.h" /* File memory management */
/* Local macros */
/* v2 B-tree info */
#define H5BT_BT2_NODE_SIZE 512
#define H5BT_BT2_RREC_SIZE(f) (H5F_SIZEOF_ADDR(f) + H5F_SIZEOF_SIZE(f)) /* Offset & length of block tracked */
#define H5BT_BT2_SPLIT_PERC 100
#define H5BT_BT2_MERGE_PERC 40
/* Local typedefs */
/* Local prototypes */
/* Package variables */
/* Declare a free list to manage the H5BT_t struct */
H5FL_DEFINE(H5BT_t);
/* Static variables */
/*-------------------------------------------------------------------------
* Function: H5BT_create
*
* Purpose: Creates a new empty block tracker in the file.
*
* Return: Non-negative on success (with address of new block tracker
* filled in), negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 10 2005
*
*-------------------------------------------------------------------------
*/
herr_t
H5BT_create(H5F_t *f, hid_t dxpl_id, haddr_t *addr_p)
{
H5BT_t *bt = NULL; /* The new B-tree header information */
herr_t ret_value=SUCCEED;
FUNC_ENTER_NOAPI(H5BT_create, FAIL)
/*
* Check arguments.
*/
HDassert(f);
/*
* Allocate file and memory data structures.
*/
if (NULL==(bt = H5FL_CALLOC(H5BT_t)))
HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for block tracker info")
/* Assign internal information */
bt->cache_info.is_dirty = TRUE;
/* Allocate space for the header on disk */
if (HADDR_UNDEF==(*addr_p=H5MF_alloc(f, H5FD_MEM_BLKTRK, dxpl_id, (hsize_t)H5BT_SIZE(f))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "file allocation failed for block tracker info")
/* Create a B-tree for storing the block info records */
if (H5B2_create(f, dxpl_id, H5B2_BLKTRK, H5BT_BT2_NODE_SIZE, H5BT_BT2_RREC_SIZE(f), H5BT_BT2_SPLIT_PERC, H5BT_BT2_MERGE_PERC, &bt->bt2_addr/*out*/)<0)
HGOTO_ERROR(H5E_BLKTRK, H5E_CANTINIT, FAIL, "can't create B-tree for storing block info")
/* Cache the new B-tree node */
if (H5AC_set(f, dxpl_id, H5AC_BLTR, *addr_p, bt, H5AC__NO_FLAGS_SET) < 0)
HGOTO_ERROR(H5E_BLKTRK, H5E_CANTINIT, FAIL, "can't add block tracker info to cache")
done:
if (ret_value<0) {
if (bt)
(void)H5BT_cache_dest(f,bt);
} /* end if */
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5BT_create() */
/*-------------------------------------------------------------------------
* Function: H5BT_insert_neighbor_cb
*
* Purpose: v2 B-tree neighbor callback for H5BT_insert()
*
* Return: Success: 0
*
* Failure: 1
*
* Programmer: Quincey Koziol
* Thursday, March 10, 2005
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static int
H5BT_insert_neighbor_cb(const void *_record, void *_op_data)
{
const H5BT_blk_info_t *record = (const H5BT_blk_info_t *)_record;
H5BT_blk_info_t *search = (H5BT_blk_info_t *)_op_data;
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5BT_insert_neighbor_cb)
*search = *record;
FUNC_LEAVE_NOAPI(0)
} /* end H5BT_insert_neighbor_cb() */
/*-------------------------------------------------------------------------
* Function: H5BT_insert
*
* Purpose: Insert new block (offset/length) into a block tracker.
* Duplicate and overlapping blocks are rejected.
*
* Return: Non-negative on success, negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 10 2005
*
*-------------------------------------------------------------------------
*/
herr_t
H5BT_insert(H5F_t *f, hid_t dxpl_id, haddr_t addr, haddr_t offset, hsize_t length)
{
H5BT_t *bt = NULL; /* The new B-tree header information */
H5BT_blk_info_t lower, upper; /* Info for blocks less than & greater than new block */
hbool_t lower_valid = FALSE, upper_valid = FALSE; /* Lower & upper blocks valid? */
H5BT_blk_info_t new_block; /* Info for new block */
herr_t ret_value=SUCCEED;
FUNC_ENTER_NOAPI(H5BT_insert, FAIL)
/*
* Check arguments.
*/
HDassert(f);
HDassert(H5F_addr_defined(addr));
/* Look up the block tracker header */
if (NULL == (bt = H5AC_protect(f, dxpl_id, H5AC_BLTR, addr, NULL, NULL, H5AC_WRITE)))
HGOTO_ERROR(H5E_BLKTRK, H5E_CANTPROTECT, FAIL, "unable to load block tracker info")
/* Check for block at this address already */
if (H5B2_find(f, dxpl_id, H5B2_BLKTRK, bt->bt2_addr, &offset, NULL, NULL) >= 0)
HGOTO_ERROR(H5E_BLKTRK, H5E_EXISTS, FAIL, "block at address already exists")
/* Clear any errors from H5B2_find() */
H5E_clear_stack(NULL);
/* Find next block lower than the new block */
if ( H5B2_neighbor(f, dxpl_id, H5B2_BLKTRK, bt->bt2_addr, H5B2_COMPARE_LESS, &offset, H5BT_insert_neighbor_cb, &lower) >= 0) {
if ( H5F_addr_overlap(lower.addr, lower.len, offset, length) )
HGOTO_ERROR(H5E_BLKTRK, H5E_OVERLAPS, FAIL, "new block overlaps existing block")
/* Set flag to indicate lower bound found */
lower_valid = TRUE;
} /* end if */
/* Clear any errors from H5B2_neighbor() */
H5E_clear_stack(NULL);
/* Find next block higher than the new block */
if ( H5B2_neighbor(f, dxpl_id, H5B2_BLKTRK, bt->bt2_addr, H5B2_COMPARE_GREATER, &offset, H5BT_insert_neighbor_cb, &upper) >= 0) {
if ( H5F_addr_overlap(upper.addr, upper.len, offset, length) )
HGOTO_ERROR(H5E_BLKTRK, H5E_OVERLAPS, FAIL, "new block overlaps existing block")
/* Set flag to indicate upper bound found */
upper_valid = TRUE;
} /* end if */
/* Clear any errors from H5B2_neighbor() */
H5E_clear_stack(NULL);
/* Check for merged blocks */
if(lower_valid || upper_valid) {
HDfprintf(stderr,"%s: Lower & upper block merging not supported yet!\n",FUNC);
HGOTO_ERROR(H5E_BLKTRK, H5E_UNSUPPORTED, FAIL, "lower or upper block found!")
} /* end if */
/* Insert new block into B-tree */
new_block.addr = offset;
new_block.len = length;
if(H5B2_insert(f, dxpl_id, H5B2_BLKTRK, bt->bt2_addr, &new_block) < 0)
HDONE_ERROR(H5E_BLKTRK, H5E_CANTINSERT, FAIL, "unable to insert block")
done:
/* Release the block tracker info */
if (bt && H5AC_unprotect(f, dxpl_id, H5AC_BLTR, addr, bt, H5AC__NO_FLAGS_SET) < 0)
HDONE_ERROR(H5E_BLKTRK, H5E_CANTUNPROTECT, FAIL, "unable to release block tracker info")
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5BT_insert() */
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