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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: H5BTcache.c
+ * Mar 10 2005
+ * Quincey Koziol <koziol@ncsa.uiuc.edu>
+ *
+ * Purpose: Implement block tracker metadata cache methods.
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#define H5BT_PACKAGE /*suppress error about including H5B2pkg */
+
+/* Private headers */
+#include "H5private.h" /* Generic Functions */
+#include "H5BTpkg.h" /* Block tracker */
+#include "H5Eprivate.h" /* Error handling */
+
+/* Local macros */
+
+/* Block tracker format version #'s */
+#define H5BT_VERSION 0
+
+
+/* Local typedefs */
+
+/* Local prototypes */
+
+/* Metadata cache callbacks */
+static H5BT_t *H5BT_cache_load(H5F_t *f, hid_t dxpl_id, haddr_t addr, const void *_type, void *udata);
+static herr_t H5BT_cache_flush(H5F_t *f, hid_t dxpl_id, hbool_t destroy, haddr_t addr, H5BT_t *b);
+static herr_t H5BT_cache_clear(H5F_t *f, H5BT_t *b, hbool_t destroy);
+static herr_t H5BT_cache_size(const H5F_t *f, const H5BT_t *bt, size_t *size_ptr);
+
+/* Package variables */
+
+/* H5BT inherits cache-like properties from H5AC */
+const H5AC_class_t H5AC_BLTR[1] = {{
+ H5AC_BLTR_ID,
+ (H5AC_load_func_t)H5BT_cache_load,
+ (H5AC_flush_func_t)H5BT_cache_flush,
+ (H5AC_dest_func_t)H5BT_cache_dest,
+ (H5AC_clear_func_t)H5BT_cache_clear,
+ (H5AC_size_func_t)H5BT_cache_size,
+}};
+
+/* Static variables */
+
+/* Declare a free list to manage block tracker data to/from disk */
+H5FL_BLK_DEFINE_STATIC(info_block);
+
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5BT_cache_load
+ *
+ * Purpose: Loads block tracker info from the disk.
+ *
+ * Return: Success: Pointer to a new block tracker
+ *
+ * Failure: NULL
+ *
+ * Programmer: Quincey Koziol
+ * koziol@ncsa.uiuc.edu
+ * Mar 10 2005
+ *
+ *-------------------------------------------------------------------------
+ */
+static H5BT_t *
+H5BT_cache_load(H5F_t *f, hid_t dxpl_id, haddr_t addr, const void UNUSED *udata1, void UNUSED *udata2)
+{
+ H5BT_t *bt = NULL;
+ size_t size;
+ uint8_t *buf = NULL;
+ uint8_t *p; /* Pointer into raw data buffer */
+ H5BT_t *ret_value;
+
+ FUNC_ENTER_NOAPI(H5BT_cache_load, NULL)
+
+ /* Check arguments */
+ HDassert(f);
+ HDassert(H5F_addr_defined(addr));
+
+ if (NULL==(bt = H5FL_MALLOC(H5BT_t)))
+ HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
+ HDmemset(&bt->cache_info,0,sizeof(H5AC_info_t));
+
+ /* Compute the size of the B-tree header on disk */
+ size = H5BT_SIZE(f);
+
+ /* Allocate temporary buffer */
+ if ((buf=H5FL_BLK_MALLOC(info_block,size))==NULL)
+ HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
+
+ /* Read header from disk */
+ if (H5F_block_read(f, H5FD_MEM_BLKTRK, addr, size, dxpl_id, buf)<0)
+ HGOTO_ERROR(H5E_BLKTRK, H5E_READERROR, NULL, "can't read block tracker info")
+
+ p = buf;
+
+ /* magic number */
+ if (HDmemcmp(p, H5BT_MAGIC, H5BT_SIZEOF_MAGIC))
+ HGOTO_ERROR(H5E_BLKTRK, H5E_CANTLOAD, NULL, "wrong block tracker info signature")
+ p += H5BT_SIZEOF_MAGIC;
+
+ /* version */
+ if (*p++ != H5BT_VERSION)
+ HGOTO_ERROR(H5E_BLKTRK, H5E_CANTLOAD, NULL, "wrong block tracker info version")
+
+ /* Size status information */
+ bt->status = *p++;
+
+ /* Max. block size info */
+ H5F_DECODE_LENGTH(f, p, bt->max_block_size);
+ UINT32DECODE(p, bt->max_block_cnt);
+
+ /* Min. block size info */
+ H5F_DECODE_LENGTH(f, p, bt->min_block_size);
+ UINT32DECODE(p, bt->min_block_cnt);
+
+ /* Total size of all blocks tracked */
+ H5F_DECODE_LENGTH(f, p, bt->tot_block_size);
+
+ /* Address of B-tree for blocks */
+ H5F_addr_decode(f, (const uint8_t **)&p, &(bt->bt2_addr));
+
+ /* Set return value */
+ ret_value = bt;
+
+done:
+ if(buf)
+ H5FL_BLK_FREE(info_block,buf);
+ if (!ret_value && bt)
+ (void)H5BT_cache_dest(f,bt);
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5BT_cache_load() */
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5BT_cache_flush
+ *
+ * Purpose: Flushes dirty block tracker info to disk.
+ *
+ * Return: Non-negative on success/Negative on failure
+ *
+ * Programmer: Quincey Koziol
+ * koziol@ncsa.uiuc.edu
+ * Mar 10 2005
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5BT_cache_flush(H5F_t *f, hid_t dxpl_id, hbool_t destroy, haddr_t addr, H5BT_t *bt)
+{
+ herr_t ret_value = SUCCEED; /* Return value */
+
+ FUNC_ENTER_NOAPI(H5BT_cache_flush, FAIL)
+
+ /* check arguments */
+ HDassert(f);
+ HDassert(H5F_addr_defined(addr));
+ HDassert(bt);
+
+ if (bt->cache_info.is_dirty) {
+ uint8_t *buf = NULL;
+ uint8_t *p; /* Pointer into raw data buffer */
+ size_t size;
+
+ /* Compute the size of the B-tree header on disk */
+ size = H5BT_SIZE(f);
+
+ /* Allocate temporary buffer */
+ if ((buf=H5FL_BLK_MALLOC(info_block,size))==NULL)
+ HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
+
+ p = buf;
+
+ /* magic number */
+ HDmemcpy(p, H5BT_MAGIC, H5BT_SIZEOF_MAGIC);
+ p += H5BT_SIZEOF_MAGIC;
+
+ /* version # */
+ *p++ = H5BT_VERSION;
+
+ /* Size status information */
+ *p++ = bt->status;
+
+ /* Max. block size info */
+ H5F_ENCODE_LENGTH(f, p, bt->max_block_size);
+ UINT32ENCODE(p, bt->max_block_cnt);
+
+ /* Min. block size info */
+ H5F_ENCODE_LENGTH(f, p, bt->min_block_size);
+ UINT32ENCODE(p, bt->min_block_cnt);
+
+ /* Total size of all blocks tracked */
+ H5F_ENCODE_LENGTH(f, p, bt->tot_block_size);
+
+ /* Address of B-tree for blocks */
+ H5F_addr_encode(f, &p, bt->bt2_addr);
+
+ /* Write the block tracker info. */
+ if (H5F_block_write(f, H5FD_MEM_BLKTRK, addr, size, dxpl_id, buf) < 0)
+ HGOTO_ERROR(H5E_BLKTRK, H5E_CANTFLUSH, FAIL, "unable to save block tracker info to disk")
+
+ H5FL_BLK_FREE(info_block,buf);
+
+ bt->cache_info.is_dirty = FALSE;
+ } /* end if */
+
+ if (destroy)
+ if (H5BT_cache_dest(f,bt) < 0)
+ HGOTO_ERROR(H5E_BLKTRK, H5E_CANTFREE, FAIL, "unable to destroy block tracker info")
+
+done:
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* H5BT_cache_flush() */
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5B_cache_dest
+ *
+ * Purpose: Destroys a block tracker in memory.
+ *
+ * Return: Non-negative on success/Negative on failure
+ *
+ * Programmer: Quincey Koziol
+ * koziol@ncsa.uiuc.edu
+ * Mar 10 2005
+ *
+ *-------------------------------------------------------------------------
+ */
+/* ARGSUSED */
+herr_t
+H5BT_cache_dest(H5F_t UNUSED *f, H5BT_t *bt)
+{
+ FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5BT_cache_dest)
+
+ /*
+ * Check arguments.
+ */
+ HDassert(bt);
+
+ /* Free block tracker info */
+ H5FL_FREE(H5BT_t,bt);
+
+ FUNC_LEAVE_NOAPI(SUCCEED)
+} /* end H5BT_cache_dest() */
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5BT_cache_clear
+ *
+ * Purpose: Mark a block tracker info in memory as non-dirty.
+ *
+ * Return: Non-negative on success/Negative on failure
+ *
+ * Programmer: Quincey Koziol
+ * koziol@ncsa.uiuc.edu
+ * Mar 10 2005
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5BT_cache_clear(H5F_t *f, H5BT_t *bt, hbool_t destroy)
+{
+ herr_t ret_value = SUCCEED;
+
+ FUNC_ENTER_NOAPI_NOINIT(H5BT_cache_clear)
+
+ /*
+ * Check arguments.
+ */
+ HDassert(bt);
+
+ /* Reset the dirty flag. */
+ bt->cache_info.is_dirty = FALSE;
+
+ if (destroy)
+ if (H5BT_cache_dest(f, bt) < 0)
+ HGOTO_ERROR(H5E_BLKTRK, H5E_CANTFREE, FAIL, "unable to destroy block tracker info")
+
+done:
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5BT_cache_clear() */
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5BT_cache_size
+ *
+ * Purpose: Compute the size in bytes of a block tracker info
+ * 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: Quincey Koziol
+ * koziol@ncsa.uiuc.edu
+ * Mar 10 2005
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5BT_cache_size(const H5F_t *f, const H5BT_t UNUSED *bt, size_t *size_ptr)
+{
+ FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5BT_cache_size)
+
+ /* check arguments */
+ HDassert(f);
+ HDassert(size_ptr);
+
+ /* Set size value */
+ *size_ptr = H5BT_SIZE(f);
+
+ FUNC_LEAVE_NOAPI(SUCCEED)
+} /* H5BT_cache_size() */
+
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