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Diffstat (limited to 'src/H5BT.c')
| -rw-r--r-- | src/H5BT.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/H5BT.c b/src/H5BT.c new file mode 100644 index 0000000..c24ce06 --- /dev/null +++ b/src/H5BT.c @@ -0,0 +1,110 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * 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() */ + |