/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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: H5Oalloc.c * Nov 17 2006 * Quincey Koziol * * Purpose: Object header allocation routines. * *------------------------------------------------------------------------- */ /****************/ /* Module Setup */ /****************/ #define H5O_PACKAGE /*suppress error about including H5Opkg */ /***********/ /* Headers */ /***********/ #include "H5private.h" /* Generic Functions */ #include "H5Eprivate.h" /* Error handling */ #include "H5FLprivate.h" /* Free lists */ #include "H5MFprivate.h" /* File memory management */ #include "H5Opkg.h" /* Object headers */ /****************/ /* Local Macros */ /****************/ /******************/ /* Local Typedefs */ /******************/ /********************/ /* Package Typedefs */ /********************/ /********************/ /* Local Prototypes */ /********************/ static herr_t H5O_add_gap(H5O_t *oh, unsigned chunkno, unsigned idx, uint8_t *new_gap_loc, size_t new_gap_size); static herr_t H5O_eliminate_gap(H5O_t *oh, H5O_mesg_t *mesg, uint8_t *new_gap_loc, size_t new_gap_size); static herr_t H5O_alloc_null(H5O_t *oh, unsigned null_idx, const H5O_msg_class_t *new_type, void *new_native, size_t new_size); static herr_t H5O_alloc_msgs(H5O_t *oh, size_t min_alloc); static htri_t H5O_alloc_extend_chunk(H5F_t *f, H5O_t *oh, unsigned chunkno, size_t size, unsigned * msg_idx); static unsigned H5O_alloc_new_chunk(H5F_t *f, hid_t dxpl_id, H5O_t *oh, size_t size); static htri_t H5O_move_msgs_forward(H5O_t *oh); static htri_t H5O_merge_null(H5O_t *oh); static htri_t H5O_remove_empty_chunks(H5F_t *f, H5O_t *oh, hid_t dxpl_id); /*********************/ /* Package Variables */ /*********************/ /* Declare extern the free list for H5O_cont_t's */ H5FL_EXTERN(H5O_cont_t); /*****************************/ /* Library Private Variables */ /*****************************/ /*******************/ /* Local Variables */ /*******************/ /*------------------------------------------------------------------------- * Function: H5O_add_gap * * Purpose: Add a gap to a chunk * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * koziol@hdfgroup.org * Oct 17 2006 * *------------------------------------------------------------------------- */ static herr_t H5O_add_gap(H5O_t *oh, unsigned chunkno, unsigned idx, uint8_t *new_gap_loc, size_t new_gap_size) { hbool_t merged_with_null; /* Whether the gap was merged with a null message */ unsigned u; /* Local index variable */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_NOAPI_NOINIT(H5O_add_gap) /* check args */ HDassert(oh); HDassert(oh->version > H5O_VERSION_1); HDassert(new_gap_loc); HDassert(new_gap_size); /* Check for existing null message in chunk */ merged_with_null = FALSE; for(u = 0; u < oh->nmesgs && !merged_with_null; u++) { /* Find a null message in the chunk with the new gap */ /* (a null message that's not the one we are eliminating) */ if(H5O_NULL_ID == oh->mesg[u].type->id && oh->mesg[u].chunkno == chunkno && u != idx) { /* Sanity check - chunks with null messages shouldn't have a gap */ HDassert(oh->chunk[chunkno].gap == 0); /* Eliminate the gap in the chunk */ if(H5O_eliminate_gap(oh, &oh->mesg[u], new_gap_loc, new_gap_size) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, FAIL, "can't eliminate gap in chunk") /* Set flag to indicate that the gap was handled */ merged_with_null = TRUE; } /* end if */ } /* end for */ /* If we couldn't find a null message in the chunk, move the gap to the end */ if(!merged_with_null) { /* Adjust message offsets after new gap forward in chunk */ for(u = 0; u < oh->nmesgs; u++) if(oh->mesg[u].chunkno == chunkno && oh->mesg[u].raw > new_gap_loc) oh->mesg[u].raw -= new_gap_size; /* Slide raw message info forward in chunk image */ HDmemmove(new_gap_loc, new_gap_loc + new_gap_size, (size_t)((oh->chunk[chunkno].image + (oh->chunk[chunkno].size - H5O_SIZEOF_CHKSUM_OH(oh))) - (new_gap_loc + new_gap_size))); /* Add existing gap size to new gap size */ new_gap_size += oh->chunk[chunkno].gap; /* Merging with existing gap will allow for a new null message */ if(new_gap_size >= (size_t)H5O_SIZEOF_MSGHDR_OH(oh)) { H5O_mesg_t *null_msg; /* Pointer to new null message */ /* Check if we need to extend message table to hold the new null message */ if(oh->nmesgs >= oh->alloc_nmesgs) if(H5O_alloc_msgs(oh, (size_t)1) < 0) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, UFAIL, "can't allocate more space for messages") /* Increment new gap size */ oh->chunk[chunkno].gap += new_gap_size; /* Create new null message, with the tail of the previous null message */ null_msg = &(oh->mesg[oh->nmesgs++]); null_msg->type = H5O_MSG_NULL; null_msg->dirty = TRUE; null_msg->native = NULL; null_msg->raw_size = new_gap_size - H5O_SIZEOF_MSGHDR_OH(oh); null_msg->raw = (oh->chunk[chunkno].image + oh->chunk[chunkno].size) - (H5O_SIZEOF_CHKSUM_OH(oh) + null_msg->raw_size); null_msg->chunkno = chunkno; /* Zero out new null message's raw data */ if(null_msg->raw_size) HDmemset(null_msg->raw, 0, null_msg->raw_size); /* Reset size of gap in chunk */ oh->chunk[chunkno].gap = 0; } /* end if */ else oh->chunk[chunkno].gap = new_gap_size; } /* end if */ done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O_add_gap() */ /*------------------------------------------------------------------------- * Function: H5O_eliminate_gap * * Purpose: Eliminate a gap in a chunk with a null message * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * koziol@hdfgroup.org * Oct 17 2006 * *------------------------------------------------------------------------- */ static herr_t H5O_eliminate_gap(H5O_t *oh, H5O_mesg_t *mesg, uint8_t *gap_loc, size_t gap_size) { uint8_t *move_start, *move_end; /* Pointers to area of messages to move */ hbool_t null_before_gap; /* Flag whether the null message is before the gap or not */ FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5O_eliminate_gap) /* check args */ HDassert(oh); HDassert(oh->version > H5O_VERSION_1); HDassert(mesg); HDassert(gap_loc); HDassert(gap_size); /* Check if the null message is before or after the gap produced */ null_before_gap = (hbool_t)(mesg->raw < gap_loc); /* Set up information about region of messages to move */ if(null_before_gap) { move_start = mesg->raw + mesg->raw_size; move_end = gap_loc; } /* end if */ else { move_start = gap_loc + gap_size; move_end = mesg->raw - H5O_SIZEOF_MSGHDR_OH(oh); } /* end else */ /* Check for messages between null message and gap */ if(move_end > move_start) { unsigned u; /* Local index variable */ /* Look for messages that need to move, to adjust raw pointers in chunk */ for(u = 0; u < oh->nmesgs; u++) { uint8_t *msg_start; /* Start of encoded message in chunk */ msg_start = oh->mesg[u].raw - H5O_SIZEOF_MSGHDR_OH(oh); if(oh->mesg[u].chunkno == mesg->chunkno && (msg_start >= move_start && msg_start < move_end)) { /* Move message's raw pointer in appropriate direction */ if(null_before_gap) oh->mesg[u].raw += gap_size; else oh->mesg[u].raw -= gap_size; } /* end if */ } /* end for */ /* Slide raw message info in chunk image */ if(null_before_gap) /* Slide messages down */ HDmemmove(move_start + gap_size, move_start, (size_t)(move_end - move_start)); else { /* Slide messages up */ HDmemmove(move_start - gap_size, move_start, (size_t)(move_end - move_start)); /* Adjust start of null message */ mesg->raw -= gap_size; } /* end else */ } else if(move_end == move_start && !null_before_gap) { /* Slide null message up */ HDmemmove(move_start - gap_size, move_start, mesg->raw_size + H5O_SIZEOF_MSGHDR_OH(oh)); /* Adjust start of null message */ mesg->raw -= gap_size; } /* end if */ /* Zero out addition to null message */ HDmemset(mesg->raw + mesg->raw_size, 0, gap_size); /* Adjust size of null message */ mesg->raw_size += gap_size; /* Mark null message as dirty */ mesg->dirty = TRUE; FUNC_LEAVE_NOAPI(SUCCEED) } /* H5O_eliminate_gap() */ /*------------------------------------------------------------------------- * * Function: H5O_alloc_null * * Purpose: Allocate room for a new message from a null message * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * koziol@hdfgroup.org * Oct 22 2006 * *------------------------------------------------------------------------- */ static herr_t H5O_alloc_null(H5O_t *oh, unsigned null_idx, const H5O_msg_class_t *new_type, void *new_native, size_t new_size) { H5O_mesg_t *alloc_msg; /* Pointer to null message to allocate out of */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_NOAPI_NOINIT(H5O_alloc_null) /* check args */ HDassert(oh); HDassert(new_type); HDassert(new_size); /* Point to null message to allocate out of */ alloc_msg = &oh->mesg[null_idx]; /* Check if there's a need to split the null message */ if(alloc_msg->raw_size > new_size) { /* Check for producing a gap in the chunk */ if((alloc_msg->raw_size - new_size) < (size_t)H5O_SIZEOF_MSGHDR_OH(oh)) { size_t gap_size = alloc_msg->raw_size - new_size; /* Size of gap produced */ /* Adjust the size of the null message being eliminated */ alloc_msg->raw_size = new_size; /* Add the gap to the chunk */ if(H5O_add_gap(oh, alloc_msg->chunkno, null_idx, alloc_msg->raw + alloc_msg->raw_size, gap_size) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, UFAIL, "can't insert gap in chunk") } /* end if */ else { size_t new_mesg_size = new_size + H5O_SIZEOF_MSGHDR_OH(oh); /* Total size of newly allocated message */ H5O_mesg_t *null_msg; /* Pointer to new null message */ /* Check if we need to extend message table to hold the new null message */ if(oh->nmesgs >= oh->alloc_nmesgs) { if(H5O_alloc_msgs(oh, (size_t)1) < 0) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, UFAIL, "can't allocate more space for messages") /* "Retarget" 'alloc_msg' pointer into newly re-allocated array of messages */ alloc_msg = &oh->mesg[null_idx]; } /* end if */ /* Create new null message, with the tail of the previous null message */ null_msg = &(oh->mesg[oh->nmesgs++]); null_msg->type = H5O_MSG_NULL; null_msg->dirty = TRUE; null_msg->native = NULL; null_msg->raw = alloc_msg->raw + new_mesg_size; null_msg->raw_size = alloc_msg->raw_size - new_mesg_size; null_msg->chunkno = alloc_msg->chunkno; /* Check for gap in new null message's chunk */ if(oh->chunk[null_msg->chunkno].gap > 0) { unsigned null_chunkno = null_msg->chunkno; /* Chunk w/gap */ /* Eliminate the gap in the chunk */ if(H5O_eliminate_gap(oh, null_msg, ((oh->chunk[null_chunkno].image + oh->chunk[null_chunkno].size) - (H5O_SIZEOF_CHKSUM_OH(oh) + oh->chunk[null_chunkno].gap)), oh->chunk[null_chunkno].gap) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTREMOVE, UFAIL, "can't eliminate gap in chunk") /* Set the gap size to zero for the chunk */ oh->chunk[null_chunkno].gap = 0; } /* end if */ /* Set the size of the new "real" message */ alloc_msg->raw_size = new_size; } /* end else */ } /* end if */ /* Initialize the new message */ alloc_msg->type = new_type; alloc_msg->dirty = TRUE; alloc_msg->native = new_native; done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O_alloc_null() */ /*------------------------------------------------------------------------- * * Function: H5O_alloc_msgs * * Purpose: Allocate more messages for a header * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * koziol@ncsa.uiuc.edu * Nov 21 2005 * *------------------------------------------------------------------------- */ static herr_t H5O_alloc_msgs(H5O_t *oh, size_t min_alloc) { size_t old_alloc; /* Old number of messages allocated */ size_t na; /* New number of messages allocated */ H5O_mesg_t *new_mesg; /* Pointer to new message array */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_NOAPI_NOINIT(H5O_alloc_msgs) /* check args */ HDassert(oh); /* Initialize number of messages information */ old_alloc = oh->alloc_nmesgs; na = oh->alloc_nmesgs + MAX(oh->alloc_nmesgs, min_alloc); /* Attempt to allocate more memory */ if(NULL == (new_mesg = H5FL_SEQ_REALLOC(H5O_mesg_t, oh->mesg, na))) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed") /* Update ohdr information */ oh->alloc_nmesgs = na; oh->mesg = new_mesg; /* Set new object header info to zeros */ HDmemset(&oh->mesg[old_alloc], 0, (oh->alloc_nmesgs - old_alloc) * sizeof(H5O_mesg_t)); done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O_alloc_msgs() */ /*------------------------------------------------------------------------- * * Function: H5O_alloc_extend_chunk * * Purpose: Attempt to extend a chunk that is allocated on disk. * * If the extension is successful, and if the last message * of the chunk is the null message, then that message will * be extended with the chunk. Otherwise a new null message * is created. * * f is the file in which the chunk will be written. It is * included to ensure that there is enough space to extend * this chunk. * * Return: TRUE: The chunk has been extended, and *msg_idx * contains the message index for null message * which is large enough to hold size bytes. * * FALSE: The chunk cannot be extended, and *msg_idx * is undefined. * * FAIL: Some internal error has been detected. * * Programmer: John Mainzer -- 8/16/05 * *------------------------------------------------------------------------- */ static htri_t H5O_alloc_extend_chunk(H5F_t *f, H5O_t *oh, unsigned chunkno, size_t size, unsigned * msg_idx) { size_t delta; /* Change in chunk's size */ size_t aligned_size = H5O_ALIGN_OH(oh, size); uint8_t *old_image; /* Old address of chunk's image in memory */ size_t old_size; /* Old size of chunk */ htri_t tri_result; /* Result from checking if chunk can be extended */ int extend_msg = -1;/* Index of null message to extend */ unsigned u; /* Local index variable */ htri_t ret_value = TRUE; /* return value */ FUNC_ENTER_NOAPI_NOINIT(H5O_alloc_extend_chunk) /* check args */ HDassert(f != NULL); HDassert(oh != NULL); HDassert(chunkno < oh->nchunks); HDassert(size > 0); HDassert(msg_idx != NULL); HDassert(H5F_addr_defined(oh->chunk[chunkno].addr)); /* Test to see if the specified chunk ends with a null messages. * If successful, set the index of the the null message in extend_msg. */ for(u = 0; u < oh->nmesgs; u++) { /* Check for null message at end of proper chunk */ /* (account for possible checksum at end of chunk) */ if(oh->mesg[u].chunkno == chunkno && H5O_NULL_ID == oh->mesg[u].type->id && ((oh->mesg[u].raw + oh->mesg[u].raw_size) == ((oh->chunk[chunkno].image + oh->chunk[chunkno].size) - (oh->chunk[chunkno].gap + H5O_SIZEOF_CHKSUM_OH(oh))))) { extend_msg = u; break; } /* end if */ } /* end for */ /* If we can extend an existing null message, adjust the delta appropriately */ if(extend_msg >= 0) { HDassert(oh->chunk[chunkno].gap == 0); delta = aligned_size - oh->mesg[extend_msg].raw_size; } /* end if */ else delta = (aligned_size + H5O_SIZEOF_MSGHDR_OH(oh)) - oh->chunk[chunkno].gap; delta = H5O_ALIGN_OH(oh, delta); /* Determine whether the chunk can be extended */ tri_result = H5MF_can_extend(f, H5FD_MEM_OHDR, oh->chunk[chunkno].addr, (hsize_t)(oh->chunk[chunkno].size), (hsize_t)delta); if(tri_result == FALSE) /* can't extend -- we are done */ HGOTO_DONE(FALSE) else if(tri_result < 0) /* error */ HGOTO_ERROR(H5E_RESOURCE, H5E_SYSTEM, FAIL, "can't tell if we can extend chunk") /* If we get this far, we should be able to extend the chunk */ if(H5MF_extend(f, H5FD_MEM_OHDR, oh->chunk[chunkno].addr, (hsize_t)(oh->chunk[chunkno].size), (hsize_t)delta) < 0 ) HGOTO_ERROR(H5E_RESOURCE, H5E_SYSTEM, FAIL, "can't extend chunk") /* If we can extend an existing null message, take care of that */ if(extend_msg >= 0) { /* Adjust message size of existing null message */ oh->mesg[extend_msg].dirty = TRUE; oh->mesg[extend_msg].raw_size += delta; } /* end if */ /* Create new null message for end of chunk */ else { /* Create a new null message */ if(oh->nmesgs >= oh->alloc_nmesgs) if(H5O_alloc_msgs(oh, (size_t)1) < 0) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate more space for messages") /* Set extension message */ extend_msg = oh->nmesgs++; /* Initialize new null message */ oh->mesg[extend_msg].type = H5O_MSG_NULL; oh->mesg[extend_msg].dirty = TRUE; oh->mesg[extend_msg].native = NULL; oh->mesg[extend_msg].raw = ((oh->chunk[chunkno].image + oh->chunk[chunkno].size) - (H5O_SIZEOF_CHKSUM_OH(oh) + oh->chunk[chunkno].gap)) + H5O_SIZEOF_MSGHDR_OH(oh); oh->mesg[extend_msg].raw_size = (delta + oh->chunk[chunkno].gap) - H5O_SIZEOF_MSGHDR_OH(oh); oh->mesg[extend_msg].chunkno = chunkno; } /* end else */ /* Allocate more memory space for chunk's image */ old_image = oh->chunk[chunkno].image; old_size = oh->chunk[chunkno].size; oh->chunk[chunkno].size += delta; oh->chunk[chunkno].image = H5FL_BLK_REALLOC(chunk_image, old_image, oh->chunk[chunkno].size); oh->chunk[chunkno].gap = 0; oh->chunk[chunkno].dirty = TRUE; if(NULL == oh->chunk[chunkno].image) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed") /* Wipe new space for chunk */ HDmemset(oh->chunk[chunkno].image + old_size, 0, oh->chunk[chunkno].size - old_size); /* Spin through existing messages, adjusting them */ for(u = 0; u < oh->nmesgs; u++) { /* Adjust raw addresses for messages in this chunk to reflect new 'image' address */ if(oh->mesg[u].chunkno == chunkno) oh->mesg[u].raw = oh->chunk[chunkno].image + (oh->mesg[u].raw - old_image); /* Find continuation message which points to this chunk and adjust chunk's size */ /* (Chunk 0 doesn't have a continuation message that points to it and * it's size is directly encoded in the object header) */ if(chunkno > 0 && (H5O_CONT_ID == oh->mesg[u].type->id) && (((H5O_cont_t *)(oh->mesg[u].native))->chunkno == chunkno)) { /* Adjust size of continuation message */ HDassert(((H5O_cont_t *)(oh->mesg[u].native))->size == old_size); ((H5O_cont_t *)(oh->mesg[u].native))->size = oh->chunk[chunkno].size; /* Flag continuation message as dirty */ oh->mesg[u].dirty = TRUE; } /* end if */ } /* end for */ /* Set return value */ *msg_idx = extend_msg; done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O_alloc_extend_chunk() */ /*------------------------------------------------------------------------- * Function: H5O_alloc_new_chunk * * Purpose: Allocates a new chunk for the object header, including * file space. * * One of the other chunks will get an object continuation * message. If there isn't room in any other chunk for the * object continuation message, then some message from * another chunk is moved into this chunk to make room. * * SIZE need not be aligned. * * Return: Success: Index number of the null message for the * new chunk. The null message will be at * least SIZE bytes not counting the message * ID or size fields. * * Failure: Negative * * Programmer: Robb Matzke * matzke@llnl.gov * Aug 7 1997 * *------------------------------------------------------------------------- */ static unsigned H5O_alloc_new_chunk(H5F_t *f, hid_t dxpl_id, H5O_t *oh, size_t size) { size_t cont_size; /*continuation message size */ int found_null = (-1); /*best fit null message */ int found_attr = (-1); /*best fit attribute message */ int found_link = (-1); /*best fit link message */ int found_other = (-1); /*best fit other message */ unsigned idx; /*message number */ uint8_t *p = NULL; /*ptr into new chunk */ H5O_cont_t *cont = NULL; /*native continuation message */ unsigned chunkno; /* Chunk allocated */ haddr_t new_chunk_addr; unsigned u; /* Local index variable */ unsigned ret_value; /* Return value */ FUNC_ENTER_NOAPI_NOINIT(H5O_alloc_new_chunk) /* check args */ HDassert(oh); HDassert(size > 0); size = H5O_ALIGN_OH(oh, size); /* * Find the smallest null message that will hold an object * continuation message. Failing that, find the smallest message * that could be moved to make room for the continuation message. * * Don't ever move continuation message from one chunk to another. * Prioritize link messages moving to later chunks, instead of * more "important" messages. * Avoid moving attributes when possible to preserve their * ordering (although ordering is *not* guaranteed!). * */ cont_size = H5O_ALIGN_OH(oh, H5F_SIZEOF_ADDR(f) + H5F_SIZEOF_SIZE(f)); for(u = 0; u < oh->nmesgs; u++) { int msg_id = oh->mesg[u].type->id; /* Temp. copy of message type ID */ if(H5O_NULL_ID == msg_id) { if(cont_size == oh->mesg[u].raw_size) { found_null = u; break; } else if(oh->mesg[u].raw_size >= cont_size && (found_null < 0 || oh->mesg[u].raw_size < oh->mesg[found_null].raw_size)) { found_null = u; } } else if(H5O_CONT_ID == msg_id) { /*don't consider continuation messages */ } else if(H5O_ATTR_ID == msg_id) { if(oh->mesg[u].raw_size >= cont_size && (found_attr < 0 || oh->mesg[u].raw_size < oh->mesg[found_attr].raw_size)) found_attr = u; } else if(H5O_LINK_ID == msg_id) { if(oh->mesg[u].raw_size >= cont_size && (found_link < 0 || oh->mesg[u].raw_size < oh->mesg[found_link].raw_size)) found_link = u; } else { if(oh->mesg[u].raw_size >= cont_size && (found_other < 0 || oh->mesg[u].raw_size < oh->mesg[found_other].raw_size)) found_other = u; } /* end else */ } /* end for */ HDassert(found_null >= 0 || found_attr >= 0 || found_link >= 0 || found_other >= 0); /* * If we must move some other message to make room for the null * message, then make sure the new chunk has enough room for that * other message. * * Move link messages first, then other messages, and attributes * only as a last resort. * */ if(found_null < 0) { if(found_link >= 0) found_other = found_link; if(found_other < 0) found_other = found_attr; HDassert(found_other >= 0); size += H5O_SIZEOF_MSGHDR_OH(oh) + oh->mesg[found_other].raw_size; } /* end if */ /* * The total chunk size must include enough space for the checksum * on the chunk and the continuation chunk magic #. (which are only present * in later versions of the object header) */ size += H5O_SIZEOF_CHKHDR_OH(oh); /* * The total chunk size must include the requested space plus enough * for the message header. This must be at least some minimum and a * multiple of the alignment size. */ size = MAX(H5O_MIN_SIZE, size + H5O_SIZEOF_MSGHDR_OH(oh)); HDassert(size == H5O_ALIGN_OH(oh, size)); /* allocate space in file to hold the new chunk */ new_chunk_addr = H5MF_alloc(f, H5FD_MEM_OHDR, dxpl_id, (hsize_t)size); if(HADDR_UNDEF == new_chunk_addr) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, UFAIL, "unable to allocate space for new chunk") /* * Create the new chunk giving it a file address. */ if(oh->nchunks >= oh->alloc_nchunks) { unsigned na = MAX(H5O_NCHUNKS, oh->alloc_nchunks * 2); /* Double # of chunks allocated */ H5O_chunk_t *x = H5FL_SEQ_REALLOC(H5O_chunk_t, oh->chunk, (size_t)na); if(!x) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, UFAIL, "memory allocation failed") oh->alloc_nchunks = na; oh->chunk = x; } /* end if */ chunkno = oh->nchunks++; oh->chunk[chunkno].dirty = TRUE; oh->chunk[chunkno].addr = new_chunk_addr; oh->chunk[chunkno].size = size; oh->chunk[chunkno].gap = 0; if(NULL == (oh->chunk[chunkno].image = p = H5FL_BLK_CALLOC(chunk_image, size))) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, UFAIL, "memory allocation failed") /* If this is a later version of the object header format, put the magic * # at the beginning of the chunk image. */ if(oh->version > H5O_VERSION_1) { HDmemcpy(p, H5O_CHK_MAGIC, (size_t)H5O_SIZEOF_MAGIC); p += H5O_SIZEOF_MAGIC; } /* end if */ /* * Make sure we have enough space for all possible new messages * that could be generated below. */ if(oh->nmesgs + 3 > oh->alloc_nmesgs) if(H5O_alloc_msgs(oh, (size_t)3) < 0) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, UFAIL, "can't allocate more space for messages") /* Move message (that will be replaced with continuation message) * to new chunk, if necessary. */ if(found_null < 0) { H5O_mesg_t *null_msg; /* Pointer to new null message */ /* Create null message for space that message to copy currently occupies */ found_null = oh->nmesgs++; null_msg = &(oh->mesg[found_null]); null_msg->type = H5O_MSG_NULL; null_msg->dirty = TRUE; null_msg->native = NULL; null_msg->raw = oh->mesg[found_other].raw; null_msg->raw_size = oh->mesg[found_other].raw_size; null_msg->chunkno = oh->mesg[found_other].chunkno; /* Copy the message to move to its new location */ /* (Chunk is already dirty, no need to mark it) */ HDmemcpy(p, oh->mesg[found_other].raw - H5O_SIZEOF_MSGHDR_OH(oh), oh->mesg[found_other].raw_size + H5O_SIZEOF_MSGHDR_OH(oh)); /* Switch message to point to new location */ oh->mesg[found_other].raw = p + H5O_SIZEOF_MSGHDR_OH(oh); oh->mesg[found_other].chunkno = chunkno; /* Account for copied message in new chunk */ p += H5O_SIZEOF_MSGHDR_OH(oh) + oh->mesg[found_other].raw_size; size -= H5O_SIZEOF_MSGHDR_OH(oh) + oh->mesg[found_other].raw_size; } /* end if */ HDassert(found_null >= 0); /* Create null message for [rest of] space in new chunk */ /* (account for chunk's magic # & checksum) */ idx = oh->nmesgs++; oh->mesg[idx].type = H5O_MSG_NULL; oh->mesg[idx].dirty = TRUE; oh->mesg[idx].native = NULL; oh->mesg[idx].raw = p + H5O_SIZEOF_MSGHDR_OH(oh); oh->mesg[idx].raw_size = size - (H5O_SIZEOF_CHKHDR_OH(oh) + H5O_SIZEOF_MSGHDR_OH(oh)); oh->mesg[idx].chunkno = chunkno; /* Initialize the continuation information */ if(NULL == (cont = H5FL_MALLOC(H5O_cont_t))) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, UFAIL, "memory allocation failed") cont->addr = oh->chunk[chunkno].addr; cont->size = oh->chunk[chunkno].size; cont->chunkno = chunkno; /* Split the null message and point at continuation message */ if(H5O_alloc_null(oh, (unsigned)found_null, H5O_MSG_CONT, cont, cont_size) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, UFAIL, "can't split null message") /* Set return value */ ret_value = idx; done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O_alloc_new_chunk() */ /*------------------------------------------------------------------------- * Function: H5O_alloc * * Purpose: Allocate enough space in the object header for this message. * * Return: Success: Index of message * * Failure: Negative * * Programmer: Robb Matzke * matzke@llnl.gov * Aug 6 1997 * *------------------------------------------------------------------------- */ unsigned H5O_alloc(H5F_t *f, hid_t dxpl_id, H5O_t *oh, const H5O_msg_class_t *type, size_t size, unsigned * oh_flags_ptr) { size_t aligned_size = H5O_ALIGN_OH(oh, size); unsigned idx; /* Index of message which fits allocation */ unsigned ret_value; /* Return value */ FUNC_ENTER_NOAPI(H5O_alloc, UFAIL) /* check args */ HDassert(oh); HDassert(type); HDassert(oh_flags_ptr); /* look for a null message which is large enough */ for(idx = 0; idx < oh->nmesgs; idx++) if(H5O_NULL_ID == oh->mesg[idx].type->id && oh->mesg[idx].raw_size >= aligned_size) break; /* if we didn't find one, then allocate more header space */ if(idx >= oh->nmesgs) { unsigned chunkno; /* check to see if we can extend one of the chunks. If we can, * do so. Otherwise, we will have to allocate a new chunk. * * Note that in this new version of this function, all chunks * must have file space allocated to them. */ for(chunkno = 0; chunkno < oh->nchunks; chunkno++) { htri_t tri_result; HDassert(H5F_addr_defined(oh->chunk[chunkno].addr)); tri_result = H5O_alloc_extend_chunk(f, oh, chunkno, size, &idx); if(tri_result == TRUE) break; else if(tri_result == FALSE) idx = UFAIL; else HGOTO_ERROR(H5E_OHDR, H5E_SYSTEM, UFAIL, "H5O_alloc_extend_chunk failed unexpectedly") } /* end for */ /* If idx is still UFAIL, we were not able to extend a chunk, * create a new one. */ if(idx == UFAIL) if((idx = H5O_alloc_new_chunk(f, dxpl_id, oh, size)) == UFAIL) HGOTO_ERROR(H5E_OHDR, H5E_NOSPACE, UFAIL, "unable to create a new object header data chunk") } /* end if */ /* Split the null message and point at continuation message */ if(H5O_alloc_null(oh, idx, type, NULL, aligned_size) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, UFAIL, "can't split null message") /* Mark the object header as modified */ *oh_flags_ptr |= H5AC__DIRTIED_FLAG; /* Set return value */ ret_value = idx; done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O_alloc() */ /*------------------------------------------------------------------------- * * Function: H5O_release_mesg * * Purpose: Convert a message into a null message * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * koziol@hdfgroup.org * Oct 22 2006 * *------------------------------------------------------------------------- */ herr_t H5O_release_mesg(H5F_t *f, hid_t dxpl_id, H5O_t *oh, H5O_mesg_t *mesg, hbool_t delete_mesg, hbool_t adj_link) { herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_NOAPI(H5O_release_mesg, FAIL) /* check args */ HDassert(f); HDassert(oh); HDassert(mesg); /* Check if we should operate on the message */ if(delete_mesg) { /* Free any space referred to in the file from this message */ if(H5O_delete_mesg(f, dxpl_id, mesg, adj_link) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTDELETE, FAIL, "unable to delete file space for object header message") } /* end if */ /* Free any native information */ H5O_msg_free_mesg(mesg); /* Change message type to nil and zero it */ mesg->type = H5O_MSG_NULL; HDassert(mesg->raw + mesg->raw_size <= (oh->chunk[mesg->chunkno].image + oh->chunk[mesg->chunkno].size) - (H5O_SIZEOF_CHKSUM_OH(oh) + oh->chunk[mesg->chunkno].gap)); HDmemset(mesg->raw, 0, mesg->raw_size); /* Clear message flags */ mesg->flags = 0; /* Indicate that the message was modified */ mesg->dirty = TRUE; /* Check if chunk has a gap currently */ if(oh->chunk[mesg->chunkno].gap) { /* Eliminate the gap in the chunk */ if(H5O_eliminate_gap(oh, mesg, ((oh->chunk[mesg->chunkno].image + oh->chunk[mesg->chunkno].size) - (H5O_SIZEOF_CHKSUM_OH(oh) + oh->chunk[mesg->chunkno].gap)), oh->chunk[mesg->chunkno].gap) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTREMOVE, FAIL, "can't eliminate gap in chunk") /* Set the gap size to zero for the chunk */ oh->chunk[mesg->chunkno].gap = 0; } /* end if */ done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O_release_mesg() */ /*------------------------------------------------------------------------- * * Function: H5O_move_msgs_forward * * Purpose: Move messages toward first chunk * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * koziol@ncsa.uiuc.edu * Oct 17 2005 * *------------------------------------------------------------------------- */ static htri_t H5O_move_msgs_forward(H5O_t *oh) { hbool_t packed_msg; /* Flag to indicate that messages were packed */ hbool_t did_packing = FALSE; /* Whether any messages were packed */ htri_t ret_value; /* Return value */ FUNC_ENTER_NOAPI_NOINIT(H5O_move_msgs_forward) /* check args */ HDassert(oh); /* Loop until no messages packed */ /* (Double loop is not very efficient, but it would be some extra work to * add a list of messages to each chunk -QAK) */ do { H5O_mesg_t *curr_msg; /* Pointer to current message to operate on */ unsigned u; /* Local index variable */ /* Reset packed messages flag */ packed_msg = FALSE; /* Scan through messages for messages that can be moved earlier in chunks */ for(u = 0, curr_msg = &oh->mesg[0]; u < oh->nmesgs; u++, curr_msg++) { if(H5O_NULL_ID == curr_msg->type->id) { H5O_chunk_t *chunk; /* Pointer to chunk that null message is in */ /* Check if null message is not last in chunk */ chunk = &(oh->chunk[curr_msg->chunkno]); if((curr_msg->raw + curr_msg->raw_size) != ((chunk->image + chunk->size) - (H5O_SIZEOF_CHKSUM_OH(oh) + chunk->gap))) { H5O_mesg_t *nonnull_msg; /* Pointer to current message to operate on */ unsigned v; /* Local index variable */ /* Loop over messages again, looking for the message in the chunk after the null message */ for(v = 0, nonnull_msg = &oh->mesg[0]; v < oh->nmesgs; v++, nonnull_msg++) { /* Locate message that is immediately after the null message */ if((curr_msg->chunkno == nonnull_msg->chunkno) && ((curr_msg->raw + curr_msg->raw_size) == (nonnull_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh)))) { /* Don't swap messages if the second message is also a null message */ /* (We'll merge them together later, in another routine) */ if(H5O_NULL_ID != nonnull_msg->type->id) { /* Copy raw data for non-null message to new location */ HDmemmove(curr_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh), nonnull_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh), nonnull_msg->raw_size + H5O_SIZEOF_MSGHDR_OH(oh)); /* Adjust non-null message's offset in chunk */ nonnull_msg->raw = curr_msg->raw; /* Adjust null message's offset in chunk */ curr_msg->raw = nonnull_msg->raw + nonnull_msg->raw_size + H5O_SIZEOF_MSGHDR_OH(oh); /* Mark null message dirty */ /* (since we need to re-encode its message header) */ /* (also, marking this message dirty means we * don't have to mark chunk as dirty) */ curr_msg->dirty = TRUE; /* Set the flag to indicate that the null message * was packed - if its not at the end its chunk, * we'll move it again on the next pass. */ packed_msg = TRUE; } /* end if */ /* Break out of loop */ break; } /* end if */ } /* end for */ /* Should have been message after null message */ HDassert(v < oh->nmesgs); } /* end if */ } /* end if */ else { H5O_mesg_t *null_msg; /* Pointer to current message to operate on */ unsigned v; /* Local index variable */ /* Loop over messages again, looking for large enough null message in earlier chunk */ for(v = 0, null_msg = &oh->mesg[0]; v < oh->nmesgs; v++, null_msg++) { if(H5O_NULL_ID == null_msg->type->id && curr_msg->chunkno > null_msg->chunkno && curr_msg->raw_size <= null_msg->raw_size) { unsigned old_chunkno; /* Old message information */ uint8_t *old_raw; /* Keep old information about non-null message */ old_chunkno = curr_msg->chunkno; old_raw = curr_msg->raw; /* Copy raw data for non-null message to new chunk */ HDmemcpy(null_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh), curr_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh), curr_msg->raw_size + H5O_SIZEOF_MSGHDR_OH(oh)); /* Mark null message's chunk as dirty, since the raw data image changed */ oh->chunk[null_msg->chunkno].dirty = TRUE; /* Point non-null message at null message's space */ curr_msg->chunkno = null_msg->chunkno; curr_msg->raw = null_msg->raw; /* Change information for null message */ if(curr_msg->raw_size == null_msg->raw_size) { /* Point null message at old non-null space */ /* (Instead of freeing it and allocating new message) */ null_msg->chunkno = old_chunkno; null_msg->raw = old_raw; /* Mark null message dirty */ null_msg->dirty = TRUE; } /* end if */ else { unsigned new_null_msg; /* Message index for new null message */ /* Check if null message is large enough to still exist */ if((null_msg->raw_size - curr_msg->raw_size) < (size_t)H5O_SIZEOF_MSGHDR_OH(oh)) { size_t gap_size = null_msg->raw_size - curr_msg->raw_size; /* Size of gap produced */ /* Adjust the size of the null message being eliminated */ null_msg->raw_size = curr_msg->raw_size; /* Add the gap to the chunk */ if(H5O_add_gap(oh, null_msg->chunkno, v, null_msg->raw + null_msg->raw_size, gap_size) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, FAIL, "can't insert gap in chunk") /* Re-use message # for new null message taking place of non-null message */ new_null_msg = v; } /* end if */ else { /* Adjust null message's size & offset */ null_msg->raw += curr_msg->raw_size + H5O_SIZEOF_MSGHDR_OH(oh); null_msg->raw_size -= curr_msg->raw_size + H5O_SIZEOF_MSGHDR_OH(oh); /* Mark null message dirty */ null_msg->dirty = TRUE; /* Create new null message for previous location of non-null message */ if(oh->nmesgs >= oh->alloc_nmesgs) { if(H5O_alloc_msgs(oh, (size_t)1) < 0) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate more space for messages") /* "Retarget" 'curr_msg' pointer into newly re-allocated array of messages */ curr_msg = &oh->mesg[u]; } /* end if */ /* Get message # for new null message */ new_null_msg = oh->nmesgs++; } /* end else */ /* Initialize new null message to take over non-null message's location */ oh->mesg[new_null_msg].type = H5O_MSG_NULL; oh->mesg[new_null_msg].dirty = TRUE; oh->mesg[new_null_msg].native = NULL; oh->mesg[new_null_msg].raw = old_raw; oh->mesg[new_null_msg].raw_size = curr_msg->raw_size; oh->mesg[new_null_msg].chunkno = old_chunkno; /* Check for gap in new null message's chunk */ if(oh->chunk[old_chunkno].gap > 0) { /* Eliminate the gap in the chunk */ if(H5O_eliminate_gap(oh, &oh->mesg[new_null_msg], ((oh->chunk[old_chunkno].image + oh->chunk[old_chunkno].size) - (H5O_SIZEOF_CHKSUM_OH(oh) + oh->chunk[old_chunkno].gap)), oh->chunk[old_chunkno].gap) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTREMOVE, FAIL, "can't eliminate gap in chunk") /* Set the gap size to zero for the chunk */ oh->chunk[old_chunkno].gap = 0; } /* end if */ } /* end else */ /* Indicate that we packed messages */ packed_msg = TRUE; /* Break out of loop */ /* (If it's possible to move message to even earlier chunk * we'll get it on the next pass - QAK) */ break; } /* end if */ } /* end for */ /* If we packed messages, get out of loop and start over */ /* (Don't know if this has any benefit one way or the other -QAK) */ if(packed_msg) break; } /* end else */ } /* end for */ /* If we did any packing, remember that */ if(packed_msg) did_packing = TRUE; } while(packed_msg); /* Set return value */ ret_value = did_packing; done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O_move_msgs_forward() */ /*------------------------------------------------------------------------- * * Function: H5O_merge_null * * Purpose: Merge neighboring null messages in an object header * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * koziol@ncsa.uiuc.edu * Oct 10 2005 * *------------------------------------------------------------------------- */ static htri_t H5O_merge_null(H5O_t *oh) { hbool_t merged_msg; /* Flag to indicate that messages were merged */ hbool_t did_merging = FALSE; /* Whether any messages were merged */ htri_t ret_value; /* Return value */ FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5O_merge_null) /* check args */ HDassert(oh != NULL); /* Loop until no messages merged */ /* (Double loop is not very efficient, but it would be some extra work to add * a list of messages to each chunk -QAK) */ do { H5O_mesg_t *curr_msg; /* Pointer to current message to operate on */ unsigned u; /* Local index variable */ /* Reset merged messages flag */ merged_msg = FALSE; /* Scan messages for adjacent null messages & merge them */ for(u = 0, curr_msg = &oh->mesg[0]; u < oh->nmesgs; u++, curr_msg++) { if(H5O_NULL_ID == curr_msg->type->id) { H5O_mesg_t *curr_msg2; /* Pointer to current message to operate on */ unsigned v; /* Local index variable */ /* Should be no gaps in chunk with null message */ HDassert(oh->chunk[curr_msg->chunkno].gap == 0); /* Loop over messages again, looking for null message in same chunk */ for(v = 0, curr_msg2 = &oh->mesg[0]; v < oh->nmesgs; v++, curr_msg2++) { if(u != v && H5O_NULL_ID == curr_msg2->type->id && curr_msg->chunkno == curr_msg2->chunkno) { /* Check for second message after first message */ if((curr_msg->raw + curr_msg->raw_size) == (curr_msg2->raw - H5O_SIZEOF_MSGHDR_OH(oh))) { /* Extend first null message length to cover second null message */ curr_msg->raw_size += (H5O_SIZEOF_MSGHDR_OH(oh) + curr_msg2->raw_size); /* Message has been merged */ merged_msg = TRUE; } /* end if */ /* Check for second message before first message */ else if((curr_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh)) == (curr_msg2->raw + curr_msg2->raw_size)) { /* Adjust first message address and extend length to cover second message */ curr_msg->raw -= (H5O_SIZEOF_MSGHDR_OH(oh) + curr_msg2->raw_size); curr_msg->raw_size += (H5O_SIZEOF_MSGHDR_OH(oh) + curr_msg2->raw_size); /* Message has been merged */ merged_msg = TRUE; } /* end if */ /* Second message has been merged, delete it */ if(merged_msg) { /* Release any information/memory for second message */ H5O_msg_free_mesg(curr_msg2); /* Mark first message as dirty */ curr_msg->dirty = TRUE; /* Remove second message from list of messages */ if(v < (oh->nmesgs - 1)) HDmemmove(&oh->mesg[v], &oh->mesg[v + 1], ((oh->nmesgs - 1) - v) * sizeof(H5O_mesg_t)); /* Decrement # of messages */ /* (Don't bother reducing size of message array for now -QAK) */ oh->nmesgs--; /* Get out of loop */ break; } /* end if */ } /* end if */ } /* end for */ /* Get out of loop if we merged messages */ if(merged_msg) break; } /* end if */ } /* end for */ /* If we did any merging, remember that */ if(merged_msg) did_merging = TRUE; } while(merged_msg); /* Set return value */ ret_value = did_merging; FUNC_LEAVE_NOAPI(ret_value) } /* H5O_merge_null() */ /*------------------------------------------------------------------------- * * Function: H5O_remove_empty_chunks * * Purpose: Attempt to eliminate empty chunks from object header. * * This examines a chunk to see if it's empty * and removes it (and the continuation message that points to it) * from the object header. * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * koziol@ncsa.uiuc.edu * Oct 17 2005 * *------------------------------------------------------------------------- */ static htri_t H5O_remove_empty_chunks(H5F_t *f, H5O_t *oh, hid_t dxpl_id) { hbool_t deleted_chunk; /* Whether to a chunk was deleted */ hbool_t did_deleting = FALSE; /* Whether any chunks were deleted */ htri_t ret_value; /* Return value */ FUNC_ENTER_NOAPI_NOINIT(H5O_remove_empty_chunks) /* check args */ HDassert(oh != NULL); /* Loop until no chunks are freed */ do { H5O_mesg_t *null_msg; /* Pointer to null message found */ H5O_mesg_t *cont_msg; /* Pointer to continuation message found */ unsigned u, v; /* Local index variables */ /* Reset 'chunk deleted' flag */ deleted_chunk = FALSE; /* Scan messages for null messages that fill an entire chunk */ for(u = 0, null_msg = &oh->mesg[0]; u < oh->nmesgs; u++, null_msg++) { /* If a null message takes up an entire object header chunk (and * its not the "base" chunk), delete that chunk from object header */ if(H5O_NULL_ID == null_msg->type->id && null_msg->chunkno > 0 && (H5O_SIZEOF_MSGHDR_OH(oh) + null_msg->raw_size) == (oh->chunk[null_msg->chunkno].size - H5O_SIZEOF_CHKHDR_OH(oh))) { H5O_mesg_t *curr_msg; /* Pointer to current message to operate on */ unsigned null_msg_no; /* Message # for null message */ unsigned deleted_chunkno; /* Chunk # to delete */ /* Locate continuation message that points to chunk */ for(v = 0, cont_msg = &oh->mesg[0]; v < oh->nmesgs; v++, cont_msg++) { if(H5O_CONT_ID == cont_msg->type->id) { /* Decode current continuation message if necessary */ if(NULL == cont_msg->native) { HDassert(H5O_MSG_CONT->decode); cont_msg->native = (H5O_MSG_CONT->decode)(f, dxpl_id, cont_msg->raw); if(NULL == cont_msg->native) HGOTO_ERROR(H5E_OHDR, H5E_CANTDECODE, FAIL, "unable to decode message") } /* end if */ /* Check for correct chunk to delete */ if(oh->chunk[null_msg->chunkno].addr == ((H5O_cont_t *)(cont_msg->native))->addr) break; } /* end if */ } /* end for */ /* Must be a continuation message that points to chunk containing null message */ HDassert(v < oh->nmesgs); HDassert(cont_msg); /* Initialize information about null message */ null_msg_no = u; deleted_chunkno = null_msg->chunkno; /* Convert continuation message into a null message */ if(H5O_release_mesg(f, dxpl_id, oh, cont_msg, TRUE, TRUE) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTDELETE, FAIL, "unable to convert into null message") /* * Remove chunk from object header's data structure */ /* Free memory for chunk image */ H5FL_BLK_FREE(chunk_image, oh->chunk[null_msg->chunkno].image); /* Remove chunk from list of chunks */ if(null_msg->chunkno < (oh->nchunks - 1)) HDmemmove(&oh->chunk[null_msg->chunkno], &oh->chunk[null_msg->chunkno + 1], ((oh->nchunks - 1) - null_msg->chunkno) * sizeof(H5O_chunk_t)); /* Decrement # of chunks */ /* (Don't bother reducing size of chunk array for now -QAK) */ oh->nchunks--; /* * Delete null message (in empty chunk that was be freed) from list of messages */ /* Release any information/memory for message */ H5O_msg_free_mesg(null_msg); /* Remove null message from list of messages */ if(null_msg_no < (oh->nmesgs - 1)) HDmemmove(&oh->mesg[null_msg_no], &oh->mesg[null_msg_no + 1], ((oh->nmesgs - 1) - null_msg_no) * sizeof(H5O_mesg_t)); /* Decrement # of messages */ /* (Don't bother reducing size of message array for now -QAK) */ oh->nmesgs--; /* Adjust chunk # for messages in chunks after deleted chunk */ for(u = 0, curr_msg = &oh->mesg[0]; u < oh->nmesgs; u++, curr_msg++) { HDassert(curr_msg->chunkno != deleted_chunkno); if(curr_msg->chunkno > deleted_chunkno) curr_msg->chunkno--; } /* end for */ /* Found chunk to delete */ deleted_chunk = TRUE; break; } /* end if */ } /* end for */ /* If we deleted any chunks, remember that */ if(deleted_chunk) did_deleting = TRUE; } while(deleted_chunk); /* Set return value */ ret_value = did_deleting; done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O_remove_empty_chunks() */ /*------------------------------------------------------------------------- * * Function: H5O_condense_header * * Purpose: Attempt to eliminate empty chunks from object header. * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * koziol@ncsa.uiuc.edu * Oct 4 2005 * *------------------------------------------------------------------------- */ herr_t H5O_condense_header(H5F_t *f, H5O_t *oh, hid_t dxpl_id) { hbool_t rescan_header; /* Whether to rescan header */ htri_t result; /* Result from packing/merging/etc */ herr_t ret_value = SUCCEED; /* return value */ FUNC_ENTER_NOAPI(H5O_condense_header, FAIL) /* check args */ HDassert(oh != NULL); /* Loop until no changed to the object header messages & chunks */ do { /* Reset 'rescan chunks' flag */ rescan_header = FALSE; /* Scan for messages that can be moved earlier in chunks */ result = H5O_move_msgs_forward(oh); if(result < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTPACK, FAIL, "can't move header messages forward") if(result > 0) rescan_header = TRUE; /* Scan for adjacent null messages & merge them */ result = H5O_merge_null(oh); if(result < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTPACK, FAIL, "can't pack null header messages") if(result > 0) rescan_header = TRUE; /* Scan for empty chunks to remove */ result = H5O_remove_empty_chunks(f, oh, dxpl_id); if(result < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTPACK, FAIL, "can't remove empty chunk") if(result > 0) rescan_header = TRUE; } while(rescan_header); #ifdef H5O_DEBUG H5O_assert(oh); #endif /* H5O_DEBUG */ done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O_condense_header() */