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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 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://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5Bcache.c
* Oct 31 2005
* Quincey Koziol <koziol@ncsa.uiuc.edu>
*
* Purpose: Implement B-tree metadata cache methods.
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
#define H5B_PACKAGE /*suppress error about including H5Bpkg */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Bpkg.h" /* B-link trees */
#include "H5Eprivate.h" /* Error handling */
#include "H5MFprivate.h" /* File memory management */
/****************/
/* Local Macros */
/****************/
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Local Prototypes */
/********************/
/* Metadata cache callbacks */
static H5B_t *H5B__load(H5F_t *f, hid_t dxpl_id, haddr_t addr, void *udata);
static herr_t H5B__flush(H5F_t *f, hid_t dxpl_id, hbool_t destroy, haddr_t addr, H5B_t *b, unsigned UNUSED * flags_ptr);
static herr_t H5B__dest(H5F_t *f, H5B_t *bt);
static herr_t H5B__clear(H5F_t *f, H5B_t *b, hbool_t destroy);
static herr_t H5B__compute_size(const H5F_t *f, const H5B_t *bt, size_t *size_ptr);
static herr_t H5B__notify(H5AC_notify_action_t action, H5B_t *bt);
/*********************/
/* Package Variables */
/*********************/
/* H5B inherits cache-like properties from H5AC */
const H5AC_class_t H5AC_BT[1] = {{
H5AC_BT_ID,
(H5AC_load_func_t)H5B__load,
(H5AC_flush_func_t)H5B__flush,
(H5AC_dest_func_t)H5B__dest,
(H5AC_clear_func_t)H5B__clear,
(H5AC_notify_func_t)H5B__notify,
(H5AC_size_func_t)H5B__compute_size,
}};
/*******************/
/* Local Variables */
/*******************/
/*-------------------------------------------------------------------------
* Function: H5B__load
*
* Purpose: Loads a B-tree node from the disk.
*
* Return: Success: Pointer to a new B-tree node.
* Failure: NULL
*
* Programmer: Robb Matzke
* matzke@llnl.gov
* Jun 23 1997
*
*-------------------------------------------------------------------------
*/
static H5B_t *
H5B__load(H5F_t *f, hid_t dxpl_id, haddr_t addr, void *_udata)
{
H5B_t *bt = NULL; /* Pointer to the deserialized B-tree node */
H5B_cache_ud_t *udata = (H5B_cache_ud_t *)_udata; /* User data for callback */
H5B_shared_t *shared; /* Pointer to shared B-tree info */
const uint8_t *p; /* Pointer into raw data buffer */
uint8_t *native; /* Pointer to native keys */
unsigned u; /* Local index variable */
H5B_t *ret_value; /* Return value */
FUNC_ENTER_STATIC
/* Check arguments */
HDassert(f);
HDassert(H5F_addr_defined(addr));
HDassert(udata);
if(NULL == (bt = H5FL_MALLOC(H5B_t)))
HGOTO_ERROR(H5E_BTREE, H5E_CANTALLOC, NULL, "can't allocate B-tree struct")
HDmemset(&bt->cache_info, 0, sizeof(H5AC_info_t));
/* Set & increment the ref-counted "shared" B-tree information for the node */
bt->rc_shared = udata->rc_shared;
H5UC_INC(bt->rc_shared);
/* Get a pointer to the shared info, for convenience */
shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
HDassert(shared);
/* Allocate space for the native keys and child addresses */
if(NULL == (bt->native = H5FL_BLK_MALLOC(native_block, shared->sizeof_keys)))
HGOTO_ERROR(H5E_BTREE, H5E_CANTALLOC, NULL, "can't allocate buffer for native keys")
if(NULL == (bt->child = H5FL_SEQ_MALLOC(haddr_t, (size_t)shared->two_k)))
HGOTO_ERROR(H5E_BTREE, H5E_CANTALLOC, NULL, "can't allocate buffer for child addresses")
if(H5F_block_read(f, H5FD_MEM_BTREE, addr, shared->sizeof_rnode, dxpl_id, shared->page) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_READERROR, NULL, "can't read B-tree node")
/* Set the pointer into the raw data buffer */
p = shared->page;
/* magic number */
if(HDmemcmp(p, H5B_MAGIC, (size_t)H5_SIZEOF_MAGIC))
HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, NULL, "wrong B-tree signature")
p += 4;
/* node type and level */
if(*p++ != (uint8_t)udata->type->id)
HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, NULL, "incorrect B-tree node type")
bt->level = *p++;
/* entries used */
UINT16DECODE(p, bt->nchildren);
/* Check if bt->nchildren is greater than two_k */
if(bt->nchildren > shared->two_k)
HGOTO_ERROR(H5E_BTREE, H5E_BADVALUE, NULL, "number of children is greater than maximum")
/* sibling pointers */
H5F_addr_decode(udata->f, (const uint8_t **)&p, &(bt->left));
H5F_addr_decode(udata->f, (const uint8_t **)&p, &(bt->right));
/* the child/key pairs */
native = bt->native;
for(u = 0; u < bt->nchildren; u++) {
/* Decode native key value */
if((udata->type->decode)(shared, p, native) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_CANTDECODE, NULL, "unable to decode key")
p += shared->sizeof_rkey;
native += udata->type->sizeof_nkey;
/* Decode address value */
H5F_addr_decode(udata->f, (const uint8_t **)&p, bt->child + u);
} /* end for */
/* Decode final key */
if(bt->nchildren > 0) {
/* Decode native key value */
if((udata->type->decode)(shared, p, native) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_CANTDECODE, NULL, "unable to decode key")
} /* end if */
/* Set up flush dependency. The dependency will actually be created in the
* "notify" callback. */
if(shared->swmr_write) {
HDassert(udata->parent);
bt->parent = udata->parent;
} /* end if */
/* Set return value */
ret_value = bt;
done:
if(!ret_value && bt)
if(H5B_node_dest(bt) < 0)
HDONE_ERROR(H5E_BTREE, H5E_CANTFREE, NULL, "unable to destroy B-tree node")
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5B__load() */ /*lint !e818 Can't make udata a pointer to const */
/*-------------------------------------------------------------------------
* Function: H5B__flush
*
* Purpose: Flushes a dirty B-tree node to disk.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* matzke@llnl.gov
* Jun 23 1997
*
*-------------------------------------------------------------------------
*/
static herr_t
H5B__flush(H5F_t *f, hid_t dxpl_id, hbool_t destroy, haddr_t addr, H5B_t *bt, unsigned UNUSED * flags_ptr)
{
H5B_shared_t *shared; /* Pointer to shared B-tree info */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_STATIC
/* check arguments */
HDassert(f);
HDassert(H5F_addr_defined(addr));
HDassert(bt);
shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
HDassert(shared);
HDassert(shared->type);
HDassert(shared->type->encode);
if(bt->cache_info.is_dirty) {
uint8_t *p; /* Pointer into raw data buffer */
uint8_t *native; /* Pointer to native keys */
unsigned u; /* Local index variable */
p = shared->page;
/* magic number */
HDmemcpy(p, H5B_MAGIC, (size_t)H5_SIZEOF_MAGIC);
p += 4;
/* node type and level */
*p++ = (uint8_t)shared->type->id;
H5_CHECK_OVERFLOW(bt->level, unsigned, uint8_t);
*p++ = (uint8_t)bt->level;
/* entries used */
UINT16ENCODE(p, bt->nchildren);
/* sibling pointers */
H5F_addr_encode(f, &p, bt->left);
H5F_addr_encode(f, &p, bt->right);
/* child keys and pointers */
native = bt->native;
for(u = 0; u < bt->nchildren; ++u) {
/* encode the key */
if(shared->type->encode(shared, p, native) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_CANTENCODE, FAIL, "unable to encode B-tree key")
p += shared->sizeof_rkey;
native += shared->type->sizeof_nkey;
/* encode the child address */
H5F_addr_encode(f, &p, bt->child[u]);
} /* end for */
if(bt->nchildren > 0) {
/* Encode the final key */
if(shared->type->encode(shared, p, native) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_CANTENCODE, FAIL, "unable to encode B-tree key")
} /* end if */
/*
* Write the disk page. We always write the header, but we don't
* bother writing data for the child entries that don't exist or
* for the final unchanged children.
*/
if(H5F_block_write(f, H5FD_MEM_BTREE, addr, shared->sizeof_rnode, dxpl_id, shared->page) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_CANTFLUSH, FAIL, "unable to save B-tree node to disk")
bt->cache_info.is_dirty = FALSE;
} /* end if */
if(destroy)
if(H5B__dest(f, bt) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_CANTFREE, FAIL, "unable to destroy B-tree node")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5B__flush() */
/*-------------------------------------------------------------------------
* Function: H5B__dest
*
* Purpose: Destroys a B-tree node in memory.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Jan 15 2003
*
*-------------------------------------------------------------------------
*/
static herr_t
H5B__dest(H5F_t *f, H5B_t *bt)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_STATIC
/*
* Check arguments.
*/
HDassert(f);
HDassert(bt);
HDassert(bt->rc_shared);
/* If we're going to free the space on disk, the address must be valid */
HDassert(!bt->cache_info.free_file_space_on_destroy || H5F_addr_defined(bt->cache_info.addr));
/* Check for freeing file space for B-tree node */
if(bt->cache_info.free_file_space_on_destroy) {
H5B_shared_t *shared; /* Pointer to shared B-tree info */
/* Get the pointer to the shared B-tree info */
shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
HDassert(shared);
/* Release the space on disk */
/* (XXX: Nasty usage of internal DXPL value! -QAK) */
if(H5MF_xfree(f, H5FD_MEM_BTREE, H5AC_dxpl_id, bt->cache_info.addr, (hsize_t)shared->sizeof_rnode) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_CANTFREE, FAIL, "unable to free B-tree node")
} /* end if */
/* Destroy B-tree node */
if(H5B_node_dest(bt) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_CANTFREE, FAIL, "unable to destroy B-tree node")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5B__dest() */
/*-------------------------------------------------------------------------
* Function: H5B__clear
*
* Purpose: Mark a B-tree 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
H5B__clear(H5F_t *f, H5B_t *bt, hbool_t destroy)
{
herr_t ret_value = SUCCEED;
FUNC_ENTER_STATIC
/*
* Check arguments.
*/
HDassert(bt);
/* Reset the dirty flag. */
bt->cache_info.is_dirty = FALSE;
if(destroy)
if(H5B__dest(f, bt) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_CANTFREE, FAIL, "unable to destroy B-tree node")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5B__clear() */
/*-------------------------------------------------------------------------
* Function: H5B__notify
*
* Purpose: Handle cache action notifications
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Neil Fortner
* nfortne2@hdfgroup.org
* Aug 17 2010
*
*-------------------------------------------------------------------------
*/
static herr_t
H5B__notify(H5AC_notify_action_t action, H5B_t *bt)
{
H5B_shared_t *shared; /* Pointer to shared B-tree info */
herr_t ret_value = SUCCEED;
FUNC_ENTER_STATIC
/*
* Check arguments.
*/
HDassert(bt);
HDassert(bt->rc_shared);
shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
/* Check if the file was opened with SWMR-write access */
if(shared->swmr_write) {
HDassert(bt->parent);
switch(action) {
case H5AC_NOTIFY_ACTION_AFTER_INSERT:
/* Create flush dependency on parent */
if(H5AC_create_flush_dependency(bt->parent, bt) < 0)
HGOTO_ERROR(H5E_BTREE, H5E_CANTDEPEND, FAIL, "unable to create flush dependency")
break;
case H5AC_NOTIFY_ACTION_BEFORE_EVICT:
/* Nothing to do */
break;
default:
#ifdef NDEBUG
HGOTO_ERROR(H5E_BTREE, H5E_BADVALUE, FAIL, "unknown action from metadata cache")
#else /* NDEBUG */
HDassert(0 && "Unknown action?!?");
#endif /* NDEBUG */
} /* end switch */
} /* end if */
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5B__notify() */
/*-------------------------------------------------------------------------
* Function: H5B__compute_size
*
* Purpose: Compute the size in bytes of the specified instance of
* H5B_t on disk, and return it in *len_ptr. On failure,
* the value of *len_ptr is undefined.
*
* Return: SUCCEED (Can't fail)
*
* Programmer: John Mainzer
* 5/13/04
*
*-------------------------------------------------------------------------
*/
static herr_t
H5B__compute_size(const H5F_t UNUSED *f, const H5B_t *bt, size_t *size_ptr)
{
H5B_shared_t *shared; /* Pointer to shared B-tree info */
FUNC_ENTER_NOAPI_NOINIT_NOERR
/* check arguments */
HDassert(f);
HDassert(bt);
HDassert(bt->rc_shared);
shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
HDassert(shared);
HDassert(shared->type);
HDassert(size_ptr);
/* Set size value */
*size_ptr = shared->sizeof_rnode;
FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5B__compute_size() */
|