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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://www.hdfgroup.org/licenses. *
* 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 */
/****************/
#include "H5Gmodule.h" /* This source code file is part of the H5G module */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5Gpkg.h" /* Groups */
#include "H5MFprivate.h" /* File memory management */
#include "H5MMprivate.h" /* Memory management */
#include "H5WBprivate.h" /* Wrapped Buffers */
/****************/
/* Local Macros */
/****************/
#define H5G_NODE_VERS 1 /* Symbol table node version number */
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Package Typedefs */
/********************/
/********************/
/* Local Prototypes */
/********************/
/* Metadata cache (H5AC) callbacks */
static herr_t H5G__cache_node_get_initial_load_size(void *udata, size_t *image_len);
static void *H5G__cache_node_deserialize(const void *image, size_t len, void *udata, hbool_t *dirty);
static herr_t H5G__cache_node_image_len(const void *thing, size_t *image_len);
static herr_t H5G__cache_node_serialize(const H5F_t *f, void *image, size_t len, void *thing);
static herr_t H5G__cache_node_free_icr(void *thing);
/*********************/
/* 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, /* Metadata client ID */
"Symbol table node", /* Metadata client name (for debugging) */
H5FD_MEM_BTREE, /* File space memory type for client */
H5AC__CLASS_NO_FLAGS_SET, /* Client class behavior flags */
H5G__cache_node_get_initial_load_size, /* 'get_initial_load_size' callback */
NULL, /* 'get_final_load_size' callback */
NULL, /* 'verify_chksum' callback */
H5G__cache_node_deserialize, /* 'deserialize' callback */
H5G__cache_node_image_len, /* 'image_len' callback */
NULL, /* 'pre_serialize' callback */
H5G__cache_node_serialize, /* 'serialize' callback */
NULL, /* 'notify' callback */
H5G__cache_node_free_icr, /* 'free_icr' callback */
NULL, /* 'fsf_size' callback */
}};
/* 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__cache_node_get_initial_load_size()
*
* Purpose: Determine the size of the on-disk image of the node, and
* return this value in *image_len.
*
* Return: Success: SUCCEED
* Failure: FAIL
*
* Programmer: John Mainzer
* 7/21/14
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G__cache_node_get_initial_load_size(void *_udata, size_t *image_len)
{
H5F_t *f = (H5F_t *)_udata; /* User data for callback */
FUNC_ENTER_STATIC_NOERR
/* Sanity checks */
HDassert(f);
HDassert(image_len);
/* Set the image length size */
*image_len = (size_t)(H5G_NODE_SIZE(f));
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5G__cache_node_get_initial_load_size() */
/*-------------------------------------------------------------------------
* Function: H5G__cache_node_deserialize
*
* Purpose: Given a buffer containing the on disk image of a symbol table
* node, allocate an instance of H5G_node_t, load the contents of the
* image into it, and return a pointer to the instance.
*
* Note that deserializing the image requires access to the file
* pointer, which is not included in the parameter list for this
* callback. Finesse this issue by passing in the file pointer
* twice to the H5AC_protect() call -- once as the file pointer
* proper, and again as the user data
*
* Return: Success: Pointer to in core representation
* Failure: NULL
*
* Programmer: John Mainzer
* 6/21/14
*
*-------------------------------------------------------------------------
*/
static void *
H5G__cache_node_deserialize(const void *_image, size_t len, void *_udata, hbool_t H5_ATTR_UNUSED *dirty)
{
H5F_t *f = (H5F_t *)_udata; /* User data for callback */
H5G_node_t *sym = NULL; /* Symbol table node created */
const uint8_t *image = (const uint8_t *)_image; /* Pointer to image to deserialize */
const uint8_t *image_end = image + len - 1; /* Pointer to end of image buffer */
void *ret_value = NULL; /* Return value */
FUNC_ENTER_STATIC
/* Sanity checks */
HDassert(image);
HDassert(len > 0);
HDassert(f);
HDassert(dirty);
/* 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 = (size_t)(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")
/* magic */
if (HDmemcmp(image, H5G_NODE_MAGIC, (size_t)H5_SIZEOF_MAGIC) != 0)
HGOTO_ERROR(H5E_SYM, H5E_BADVALUE, NULL, "bad symbol table node signature")
image += H5_SIZEOF_MAGIC;
/* version */
if (H5G_NODE_VERS != *image++)
HGOTO_ERROR(H5E_SYM, H5E_VERSION, NULL, "bad symbol table node version")
/* reserved */
image++;
/* number of symbols */
UINT16DECODE(image, sym->nsyms);
/* entries */
if (H5G__ent_decode_vec(f, &image, image_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:
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__cache_node_deserialize() */
/*-------------------------------------------------------------------------
* Function: H5G__cache_node_image_len
*
* Purpose: Compute the size of the data structure on disk and return
* it in *image_len.
*
* Return: Success: SUCCEED
* Failure: FAIL
*
* Programmer: John Mainzer
* 6/21/14
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G__cache_node_image_len(const void *_thing, size_t *image_len)
{
const H5G_node_t *sym = (const H5G_node_t *)_thing; /* Pointer to object */
FUNC_ENTER_STATIC_NOERR
/* Sanity checks */
HDassert(sym);
HDassert(sym->cache_info.magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
HDassert(sym->cache_info.type == H5AC_SNODE);
HDassert(image_len);
*image_len = sym->node_size;
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5G__cache_node_image_len() */
/*-------------------------------------------------------------------------
* Function: H5G__cache_node_serialize
*
* Purpose: Given a correctly sized buffer and an instance of H5G_node_t,
* serialize the contents of the instance of H5G_node_t, and write
* this data into the supplied buffer. This buffer will be written
* to disk.
*
* Return: Success: SUCCEED
* Failure: FAIL
*
* Programmer: John Mainzer
* 7/21/14
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G__cache_node_serialize(const H5F_t *f, void *_image, size_t len, void *_thing)
{
H5G_node_t *sym = (H5G_node_t *)_thing; /* Pointer to object */
uint8_t *image = (uint8_t *)_image; /* Pointer into raw data buffer */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_STATIC
/* Sanity checks */
HDassert(f);
HDassert(image);
HDassert(sym);
HDassert(sym->cache_info.magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
HDassert(sym->cache_info.type == H5AC_SNODE);
HDassert(len == sym->node_size);
/* magic number */
H5MM_memcpy(image, H5G_NODE_MAGIC, (size_t)H5_SIZEOF_MAGIC);
image += H5_SIZEOF_MAGIC;
/* version number */
*image++ = H5G_NODE_VERS;
/* reserved */
*image++ = 0;
/* number of symbols */
UINT16ENCODE(image, sym->nsyms);
/* entries */
if (H5G__ent_encode_vec(f, &image, sym->entry, sym->nsyms) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTENCODE, FAIL, "can't serialize")
/* Clear rest of symbol table node */
HDmemset(image, 0, len - (size_t)(image - (uint8_t *)_image));
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G__cache_node_serialize() */
/*-------------------------------------------------------------------------
* Function: H5G__cache_node_free_icr
*
* Purpose: Destroys a symbol table node in memory.
*
* Note: The metadata cache sets the object's cache_info.magic to
* H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC before calling a free_icr
* callback (checked in assert).
*
* Return: Success: SUCCEED
* Failure: FAIL
*
* Programmer: John Mainzer
* 6/21/14
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G__cache_node_free_icr(void *_thing)
{
H5G_node_t *sym = (H5G_node_t *)_thing; /* Pointer to the object */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_STATIC
/* Sanity checks */
HDassert(sym);
HDassert(sym->cache_info.magic == H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC);
HDassert(sym->cache_info.type == H5AC_SNODE);
/* 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__cache_node_free_icr() */
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