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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* 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 COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5Gcache.c
* Feb 5 2008
* Quincey Koziol
*
* Purpose: Implement group metadata cache methods.
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
#define H5G_PACKAGE /*suppress error about including H5Gpkg */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5Gpkg.h" /* Groups */
#include "H5MFprivate.h" /* File memory management */
#include "H5WBprivate.h" /* Wrapped Buffers */
/****************/
/* Local Macros */
/****************/
#define H5G_NODE_VERS 1 /* Symbol table node version number */
#define H5G_NODE_BUF_SIZE 512 /* Size of stack buffer for serialized nodes */
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Package Typedefs */
/********************/
/********************/
/* Local Prototypes */
/********************/
/* Metadata cache (H5AC) callbacks */
static H5G_node_t *H5G_node_load(H5F_t *f, hid_t dxpl_id, haddr_t addr, void *udata);
static herr_t H5G_node_flush(H5F_t *f, hid_t dxpl_id, hbool_t destroy, haddr_t addr, H5G_node_t *sym,
unsigned *flags_ptr);
static herr_t H5G_node_dest(H5F_t *f, H5G_node_t *sym);
static herr_t H5G_node_clear(H5F_t *f, H5G_node_t *sym, hbool_t destroy);
static herr_t H5G_node_size(const H5F_t *f, const H5G_node_t *sym, size_t *size_ptr);
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/* Symbol table nodes inherit cache-like properties from H5AC */
const H5AC_class_t H5AC_SNODE[1] = {{
H5AC_SNODE_ID,
(H5AC_load_func_t)H5G_node_load,
(H5AC_flush_func_t)H5G_node_flush,
(H5AC_dest_func_t)H5G_node_dest,
(H5AC_clear_func_t)H5G_node_clear,
(H5AC_size_func_t)H5G_node_size,
}};
/* Declare extern the free list to manage the H5G_node_t struct */
H5FL_EXTERN(H5G_node_t);
/* Declare extern the free list to manage sequences of H5G_entry_t's */
H5FL_SEQ_EXTERN(H5G_entry_t);
/*-------------------------------------------------------------------------
* Function: H5G_node_load
*
* Purpose: Loads a symbol table node from the file.
*
* Return: Success: Ptr to the new table.
* Failure: NULL
*
* Programmer: Robb Matzke
* matzke@llnl.gov
* Jun 23 1997
*
*-------------------------------------------------------------------------
*/
static H5G_node_t *
H5G_node_load(H5F_t *f, hid_t dxpl_id, haddr_t addr, void *udata)
{
H5G_node_t * sym = NULL;
H5WB_t * wb = NULL; /* Wrapped buffer for node data */
uint8_t node_buf[H5G_NODE_BUF_SIZE]; /* Buffer for node */
uint8_t * node; /* Pointer to node buffer */
const uint8_t *p;
const uint8_t *p_end;
H5G_node_t * ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOINIT
/* Sanity checks */
HDassert(f);
HDassert(H5F_addr_defined(addr));
HDassert(udata);
/* Allocate symbol table data structures */
if (NULL == (sym = H5FL_CALLOC(H5G_node_t)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
sym->node_size = H5G_NODE_SIZE(f);
if (NULL == (sym->entry = H5FL_SEQ_CALLOC(H5G_entry_t, (size_t)(2 * H5F_SYM_LEAF_K(f)))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
/* Wrap the local buffer for serialized node info */
if (NULL == (wb = H5WB_wrap(node_buf, sizeof(node_buf))))
HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, NULL, "can't wrap buffer")
/* Get a pointer to a buffer that's large enough for node */
if (NULL == (node = (uint8_t *)H5WB_actual(wb, sym->node_size)))
HGOTO_ERROR(H5E_SYM, H5E_NOSPACE, NULL, "can't get actual buffer")
/* Read the serialized symbol table node. */
if (H5F_block_read(f, H5FD_MEM_BTREE, addr, sym->node_size, dxpl_id, node) < 0)
HGOTO_ERROR(H5E_SYM, H5E_READERROR, NULL, "unable to read symbol table node")
/* Get temporary pointer to serialized node */
p = node;
/* Get a pointer to the end of the node. This ensures we don't run off
* the end of the buffer if the file is corrupt.
*/
p_end = p + sym->node_size - 1;
/* magic */
if (HDmemcmp(p, H5G_NODE_MAGIC, (size_t)H5_SIZEOF_MAGIC))
HGOTO_ERROR(H5E_SYM, H5E_CANTLOAD, NULL, "bad symbol table node signature")
p += 4;
/* version */
if (H5G_NODE_VERS != *p++)
HGOTO_ERROR(H5E_SYM, H5E_CANTLOAD, NULL, "bad symbol table node version")
/* reserved */
p++;
/* number of symbols */
UINT16DECODE(p, sym->nsyms);
/* entries */
if (H5G__ent_decode_vec(f, &p, p_end, sym->entry, sym->nsyms) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTLOAD, NULL, "unable to decode symbol table entries")
/* Set return value */
ret_value = sym;
done:
/* Release resources */
if (wb && H5WB_unwrap(wb) < 0)
HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, NULL, "can't close wrapped buffer")
if (!ret_value)
if (sym && H5G__node_free(sym) < 0)
HDONE_ERROR(H5E_SYM, H5E_CANTFREE, NULL, "unable to destroy symbol table node")
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_node_load() */
/*-------------------------------------------------------------------------
* Function: H5G_node_flush
*
* Purpose: Flush a symbol table node to disk.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* matzke@llnl.gov
* Jun 23 1997
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G_node_flush(H5F_t *f, hid_t dxpl_id, hbool_t destroy, haddr_t addr, H5G_node_t *sym,
unsigned H5_ATTR_UNUSED *flags_ptr)
{
H5WB_t *wb = NULL; /* Wrapped buffer for node data */
uint8_t node_buf[H5G_NODE_BUF_SIZE]; /* Buffer for node */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT
/*
* Check arguments.
*/
HDassert(f);
HDassert(H5F_addr_defined(addr));
HDassert(sym);
/*
* Write the symbol node to disk.
*/
if (sym->cache_info.is_dirty) {
uint8_t *node; /* Pointer to node buffer */
uint8_t *p; /* Pointer into raw data buffer */
/* Wrap the local buffer for serialized node info */
if (NULL == (wb = H5WB_wrap(node_buf, sizeof(node_buf))))
HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't wrap buffer")
/* Get a pointer to a buffer that's large enough for node */
if (NULL == (node = (uint8_t *)H5WB_actual(wb, sym->node_size)))
HGOTO_ERROR(H5E_SYM, H5E_NOSPACE, FAIL, "can't get actual buffer")
/* Get temporary pointer to serialized symbol table node */
p = node;
/* magic number */
HDmemcpy(p, H5G_NODE_MAGIC, (size_t)H5_SIZEOF_MAGIC);
p += 4;
/* version number */
*p++ = H5G_NODE_VERS;
/* reserved */
*p++ = 0;
/* number of symbols */
UINT16ENCODE(p, sym->nsyms);
/* entries */
if (H5G__ent_encode_vec(f, &p, sym->entry, sym->nsyms) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTENCODE, FAIL, "can't serialize")
HDmemset(p, 0, sym->node_size - (size_t)(p - node));
/* Write the serialized symbol table node. */
if (H5F_block_write(f, H5FD_MEM_BTREE, addr, sym->node_size, dxpl_id, node) < 0)
HGOTO_ERROR(H5E_SYM, H5E_WRITEERROR, FAIL, "unable to write symbol table node to the file")
/* Reset the node's dirty flag */
sym->cache_info.is_dirty = FALSE;
} /* end if */
/*
* Destroy the symbol node? This might happen if the node is being
* preempted from the cache.
*/
if (destroy)
if (H5G_node_dest(f, sym) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTFREE, FAIL, "unable to destroy symbol table node")
done:
/* Release resources */
if (wb && H5WB_unwrap(wb) < 0)
HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "can't close wrapped buffer")
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_node_flush() */
/*-------------------------------------------------------------------------
* Function: H5G_node_dest
*
* Purpose: Destroy a symbol table node in memory.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Jan 15 2003
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G_node_dest(H5F_t *f, H5G_node_t *sym)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT
/*
* Check arguments.
*/
HDassert(f);
HDassert(sym);
/* Verify that node is clean */
HDassert(sym->cache_info.is_dirty == FALSE);
/* If we're going to free the space on disk, the address must be valid */
HDassert(!sym->cache_info.free_file_space_on_destroy || H5F_addr_defined(sym->cache_info.addr));
/* Check for freeing file space for symbol table node */
if (sym->cache_info.free_file_space_on_destroy) {
/* Release the space on disk */
/* (XXX: Nasty usage of internal DXPL value! -QAK) */
if (H5MF_xfree(f, H5FD_MEM_BTREE, H5AC_dxpl_id, sym->cache_info.addr, (hsize_t)sym->node_size) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTFREE, FAIL, "unable to free symbol table node")
} /* end if */
/* Destroy symbol table node */
if (H5G__node_free(sym) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTFREE, FAIL, "unable to destroy symbol table node")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_node_dest() */
/*-------------------------------------------------------------------------
* Function: H5G_node_clear
*
* Purpose: Mark a symbol table node in memory as non-dirty.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 20 2003
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G_node_clear(H5F_t *f, H5G_node_t *sym, hbool_t destroy)
{
herr_t ret_value = SUCCEED;
FUNC_ENTER_NOAPI_NOINIT
/*
* Check arguments.
*/
HDassert(sym);
/* Reset the node's dirty flag */
sym->cache_info.is_dirty = FALSE;
/*
* Destroy the symbol node? This might happen if the node is being
* preempted from the cache.
*/
if (destroy)
if (H5G_node_dest(f, sym) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTFREE, FAIL, "unable to destroy symbol table node")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_node_clear() */
/*-------------------------------------------------------------------------
* Function: H5G_node_size
*
* Purpose: Compute the size in bytes of the specified instance of
* H5G_node_t 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: John Mainzer
* 5/13/04
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G_node_size(const H5F_t H5_ATTR_UNUSED *f, const H5G_node_t *sym, size_t *size_ptr)
{
FUNC_ENTER_NOAPI_NOINIT_NOERR
/*
* Check arguments.
*/
HDassert(f);
HDassert(size_ptr);
*size_ptr = sym->node_size;
FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5G_node_size() */
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