/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Copyright by The HDF Group. * * 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: H5Oalloc.c * Nov 17 2006 * Quincey Koziol * * Purpose: Object header allocation routines. * *------------------------------------------------------------------------- */ /****************/ /* Module Setup */ /****************/ #include "H5Omodule.h" /* This source code file is part of the H5O module */ /***********/ /* Headers */ /***********/ #include "H5private.h" /* Generic Functions */ #include "H5Eprivate.h" /* Error handling */ #include "H5FLprivate.h" /* Free lists */ #include "H5MFprivate.h" /* File memory management */ #include "H5MMprivate.h" /* Memory management */ #include "H5Opkg.h" /* Object headers */ /****************/ /* Local Macros */ /****************/ /******************/ /* Local Typedefs */ /******************/ /********************/ /* Package Typedefs */ /********************/ /********************/ /* Local Prototypes */ /********************/ static herr_t H5O__add_gap(H5F_t *f, H5O_t *oh, unsigned chunkno, hbool_t *chk_dirtied, size_t idx, uint8_t *new_gap_loc, size_t new_gap_size); static herr_t H5O__eliminate_gap(H5O_t *oh, hbool_t *chk_dirtied, H5O_mesg_t *mesg, uint8_t *new_gap_loc, size_t new_gap_size); static herr_t H5O__alloc_null(H5F_t *f, H5O_t *oh, size_t null_idx, const H5O_msg_class_t *new_type, void *new_native, size_t new_size); static htri_t H5O__alloc_extend_chunk(H5F_t *f, H5O_t *oh, unsigned chunkno, size_t size, size_t *msg_idx); static herr_t H5O__alloc_find_best_nonnull(const H5F_t *f, const H5O_t *oh, size_t *size, H5O_msg_alloc_info_t *found_msg); static herr_t H5O__alloc_new_chunk(H5F_t *f, H5O_t *oh, size_t size, size_t *new_idx); static herr_t H5O__alloc_find_best_null(const H5O_t *oh, size_t size, size_t *mesg_idx); static htri_t H5O__move_cont(H5F_t *f, H5O_t *oh, unsigned cont_u); static htri_t H5O__move_msgs_forward(H5F_t *f, H5O_t *oh); static htri_t H5O__merge_null(H5F_t *f, H5O_t *oh); static htri_t H5O__remove_empty_chunks(H5F_t *f, H5O_t *oh); static herr_t H5O__alloc_shrink_chunk(H5F_t *f, H5O_t *oh, unsigned chunkno); /*********************/ /* 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 * Oct 17 2006 * *------------------------------------------------------------------------- */ static herr_t H5O__add_gap(H5F_t H5_ATTR_NDEBUG_UNUSED *f, H5O_t *oh, unsigned chunkno, hbool_t *chk_dirtied, size_t 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 */ size_t u; /* Local index variable */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_PACKAGE /* check args */ HDassert(oh); HDassert(oh->version > H5O_VERSION_1); HDassert(chk_dirtied); HDassert(new_gap_loc); HDassert(new_gap_size); #ifndef NDEBUG if (chunkno > 0) { unsigned chk_proxy_status = 0; /* Object header chunk proxy entry cache status */ /* Check the object header chunk proxy's status in the metadata cache */ if (H5AC_get_entry_status(f, oh->chunk[chunkno].addr, &chk_proxy_status) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "unable to check metadata cache status for object header chunk proxy") /* Make certain that object header is protected */ HDassert(chk_proxy_status & H5AC_ES__IS_PROTECTED); } /* end if */ #endif /* NDEBUG */ /* 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, chk_dirtied, &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, FAIL, "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->native = NULL; null_msg->raw_size = new_gap_size - (size_t)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); /* Mark message as dirty */ null_msg->dirty = TRUE; /* Reset size of gap in chunk */ oh->chunk[chunkno].gap = 0; } /* end if */ else oh->chunk[chunkno].gap = new_gap_size; /* Mark the chunk as modified */ *chk_dirtied = TRUE; } /* 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. * * Note: Sometimes this happens as a result of converting an existing * non-null message to a null message, so we zero out the gap * here, even though it might already be zero (when we're adding * a gap to a chunk with an existing null message). (Mostly, * this just simplifies the code, esp. with the necessary chunk * locking -QAK) * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * Oct 17 2006 * *------------------------------------------------------------------------- */ static herr_t H5O__eliminate_gap(H5O_t *oh, hbool_t *chk_dirtied, 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_PACKAGE_NOERR /* check args */ HDassert(oh); HDassert(oh->version > H5O_VERSION_1); HDassert(chk_dirtied); 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 */ /* (this doesn't change the moved messages 'dirty' state) */ 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 + (size_t)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; /* Set the gap size to zero for the chunk */ oh->chunk[mesg->chunkno].gap = 0; /* Mark null message as dirty */ mesg->dirty = TRUE; *chk_dirtied = 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 * Oct 22 2006 * *------------------------------------------------------------------------- */ static herr_t H5O__alloc_null(H5F_t *f, H5O_t *oh, size_t null_idx, const H5O_msg_class_t *new_type, void *new_native, size_t new_size) { H5O_chunk_proxy_t *chk_proxy = NULL; /* Chunk that message is in */ hbool_t chk_dirtied = FALSE; /* Flags for unprotecting chunk */ H5O_mesg_t *alloc_msg; /* Pointer to null message to allocate out of */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_PACKAGE /* check args */ HDassert(oh); HDassert(new_type); HDassert(new_size); /* Point to null message to allocate out of */ alloc_msg = &oh->mesg[null_idx]; /* Protect chunk */ if (NULL == (chk_proxy = H5O__chunk_protect(f, oh, alloc_msg->chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load object header chunk") /* 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(f, oh, alloc_msg->chunkno, &chk_dirtied, null_idx, alloc_msg->raw + alloc_msg->raw_size, gap_size) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, FAIL, "can't insert gap in chunk") } /* end if */ else { size_t new_mesg_size = new_size + (size_t)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, FAIL, "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->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; /* Mark the message as dirty */ null_msg->dirty = TRUE; chk_dirtied = TRUE; /* 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, &chk_dirtied, 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, FAIL, "can't eliminate gap in chunk") } /* 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->native = new_native; /* Mark the new message as dirty */ alloc_msg->dirty = TRUE; chk_dirtied = TRUE; done: /* Release chunk */ if (chk_proxy && H5O__chunk_unprotect(f, chk_proxy, chk_dirtied) < 0) HDONE_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") 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 * Nov 21 2005 * *------------------------------------------------------------------------- */ 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_PACKAGE /* check args */ HDassert(oh); /* Initialize number of messages information */ old_alloc = oh->alloc_nmesgs; na = oh->alloc_nmesgs + MAX(oh->alloc_nmesgs, min_alloc); /* At least double */ /* 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, size_t *msg_idx) { H5O_chunk_proxy_t *chk_proxy = NULL; /* Chunk that message is in */ hbool_t chk_dirtied = FALSE; /* Flag for unprotecting chunk */ 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 was_extended; /* If chunk can be extended */ size_t extend_msg = 0; /* Index of null message to extend */ hbool_t extended_msg = FALSE; /* Whether an existing message was extended */ uint8_t new_size_flags = 0; /* New chunk #0 size flags */ hbool_t adjust_size_flags = FALSE; /* Whether to adjust the chunk #0 size flags */ size_t extra_prfx_size = 0; /* Extra bytes added to object header prefix */ size_t u; /* Local index variable */ htri_t ret_value = TRUE; /* return value */ FUNC_ENTER_PACKAGE /* 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; extended_msg = TRUE; break; } /* end if */ } /* end for */ /* If we can extend an existing null message, adjust the delta appropriately */ if (extended_msg) { HDassert(oh->chunk[chunkno].gap == 0); delta = aligned_size - oh->mesg[extend_msg].raw_size; } /* end if */ else delta = (aligned_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh)) - oh->chunk[chunkno].gap; delta = H5O_ALIGN_OH(oh, delta); /* Check for changing the chunk #0 data size enough to need adjusting the flags */ if (oh->version > H5O_VERSION_1 && chunkno == 0) { uint64_t chunk0_size; /* Size of chunk 0's data */ size_t orig_prfx_size = (size_t)1 << (oh->flags & H5O_HDR_CHUNK0_SIZE); /* Original prefix size */ HDassert(oh->chunk[0].size >= (size_t)H5O_SIZEOF_HDR(oh)); chunk0_size = oh->chunk[0].size - (size_t)H5O_SIZEOF_HDR(oh); /* Check for moving to a 8-byte size encoding */ if (orig_prfx_size < 8 && (chunk0_size + delta) > 4294967295) { extra_prfx_size = 8 - orig_prfx_size; new_size_flags = H5O_HDR_CHUNK0_8; adjust_size_flags = TRUE; } /* end if */ /* Check for moving to a 4-byte size encoding */ else if (orig_prfx_size < 4 && (chunk0_size + delta) > 65535) { extra_prfx_size = 4 - orig_prfx_size; new_size_flags = H5O_HDR_CHUNK0_4; adjust_size_flags = TRUE; } /* end if */ /* Check for moving to a 2-byte size encoding */ else if (orig_prfx_size < 2 && (chunk0_size + delta) > 255) { extra_prfx_size = 2 - orig_prfx_size; new_size_flags = H5O_HDR_CHUNK0_2; adjust_size_flags = TRUE; } /* end if */ } /* end if */ /* Protect chunk */ if (NULL == (chk_proxy = H5O__chunk_protect(f, oh, chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load object header chunk") /* Determine whether the chunk can be extended */ was_extended = H5MF_try_extend(f, H5FD_MEM_OHDR, oh->chunk[chunkno].addr, (hsize_t)(oh->chunk[chunkno].size), (hsize_t)(delta + extra_prfx_size)); if (was_extended < 0) /* error */ HGOTO_ERROR(H5E_OHDR, H5E_CANTEXTEND, FAIL, "can't tell if we can extend chunk") else if (was_extended == FALSE) /* can't extend -- we are done */ HGOTO_DONE(FALSE) /* Adjust object header prefix flags */ if (adjust_size_flags) { oh->flags = (uint8_t)(oh->flags & ~H5O_HDR_CHUNK0_SIZE); oh->flags |= new_size_flags; /* Mark object header as dirty in cache */ if (H5AC_mark_entry_dirty(oh) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTMARKDIRTY, FAIL, "unable to mark object header as dirty") } /* end if */ /* If we can extend an existing null message, take care of that */ if (extended_msg) { /* Adjust message size of existing null message */ 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].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) - (size_t)H5O_SIZEOF_MSGHDR_OH(oh); oh->mesg[extend_msg].chunkno = chunkno; } /* end else */ /* Mark the extended message as dirty */ oh->mesg[extend_msg].dirty = TRUE; chk_dirtied = TRUE; /* 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 + extra_prfx_size; oh->chunk[chunkno].image = H5FL_BLK_REALLOC(chunk_image, old_image, oh->chunk[chunkno].size); if (NULL == oh->chunk[chunkno].image) HGOTO_ERROR(H5E_OHDR, H5E_CANTALLOC, FAIL, "can't reallocate extended object header chunk") oh->chunk[chunkno].gap = 0; /* Wipe new space for chunk */ HDmemset(oh->chunk[chunkno].image + old_size, 0, oh->chunk[chunkno].size - old_size); /* Move chunk 0 data up if the size flags changed */ if (adjust_size_flags) HDmemmove(oh->chunk[0].image + H5O_SIZEOF_HDR(oh) - H5O_SIZEOF_CHKSUM_OH(oh), oh->chunk[0].image + H5O_SIZEOF_HDR(oh) - H5O_SIZEOF_CHKSUM_OH(oh) - extra_prfx_size, old_size - (size_t)H5O_SIZEOF_HDR(oh) + extra_prfx_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 + extra_prfx_size + (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, * its 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)) { H5O_chunk_proxy_t *chk_proxy2 = NULL; /* Chunk that continuation message is in */ hbool_t chk_dirtied2 = FALSE; /* Flag for unprotecting chunk */ unsigned cont_chunkno = oh->mesg[u].chunkno; /* Chunk # for continuation message */ /* Protect chunk containing continuation message */ if (NULL == (chk_proxy2 = H5O__chunk_protect(f, oh, cont_chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load object header chunk") /* Adjust size in 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; chk_dirtied2 = TRUE; /* Release chunk containing continuation message */ if (H5O__chunk_unprotect(f, chk_proxy2, chk_dirtied2) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") } /* end if */ } /* end for */ /* Resize the chunk in the cache */ if (H5O__chunk_resize(oh, chk_proxy) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTRESIZE, FAIL, "unable to resize object header chunk") /* Set new message index */ *msg_idx = extend_msg; done: /* Release chunk */ if (chk_proxy && H5O__chunk_unprotect(f, chk_proxy, chk_dirtied) < 0) HDONE_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") FUNC_LEAVE_NOAPI(ret_value) } /* H5O__alloc_extend_chunk() */ /*------------------------------------------------------------------------- * Function: H5O__alloc_find_best_nonnull * * Purpose: Find the best fit non-null message for a given size of message * to allocate. * * Note: The algorithm for finding a message to replace with a * continuation message is still fairly limited. It's possible * that two (or more) messages smaller than a continuation message * might occupy a chunk and need to be moved in order to make * room for the continuation message. * * Also, we aren't checking for NULL messages in front of another * message right now... * * 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: Quincey Koziol * Oct 21 2016 * *------------------------------------------------------------------------- */ static herr_t H5O__alloc_find_best_nonnull(const H5F_t *f, const H5O_t *oh, size_t *size, H5O_msg_alloc_info_t *found_msg) { H5O_mesg_t *curr_msg; /* Pointer to current message to operate on */ size_t cont_size; /* Continuation message size */ size_t multi_size; /* Size of all the messages in the last chunk */ unsigned u; /* Local index variable */ FUNC_ENTER_PACKAGE_NOERR /* Check args */ HDassert(f); HDassert(oh); HDassert(size); HDassert(*size > 0); HDassert(found_msg); /* * 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. * * Avoid moving attributes when possible to preserve their * ordering (although ordering is *not* guaranteed!). * */ cont_size = H5O_ALIGN_OH(oh, (size_t)(H5F_SIZEOF_ADDR(f) + H5F_SIZEOF_SIZE(f))); multi_size = 0; for (u = 0, curr_msg = &oh->mesg[0]; u < oh->nmesgs; u++, curr_msg++) { /* Don't consider continuation messages (for now) */ if (H5O_CONT_ID != curr_msg->type->id) { unsigned msg_chunkno = curr_msg->chunkno; /* Chunk that the message is in */ uint8_t *end_chunk_data = (oh->chunk[msg_chunkno].image + oh->chunk[msg_chunkno].size) - (H5O_SIZEOF_CHKSUM_OH(oh) + oh->chunk[msg_chunkno].gap); /* End of message data in chunk */ uint8_t *end_msg = curr_msg->raw + curr_msg->raw_size; /* End of current message */ size_t gap_size = 0; /* Size of gap after current message */ size_t null_size = 0; /* Size of NULL message after current message */ unsigned null_msgno = 0; /* Index of NULL message after current message */ size_t total_size; /* Total size of available space "around" current message */ /* Check if the message is the last one in the chunk */ if (end_msg == end_chunk_data) gap_size = oh->chunk[msg_chunkno].gap; else { H5O_mesg_t *tmp_msg; /* Temp. pointer to message to operate on */ unsigned v; /* Local index variable */ /* Check for null message after this message, in same chunk */ for (v = 0, tmp_msg = &oh->mesg[0]; v < oh->nmesgs; v++, tmp_msg++) { if (tmp_msg->type->id == H5O_NULL_ID && (tmp_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh)) == end_msg) { null_msgno = v; null_size = (size_t)H5O_SIZEOF_MSGHDR_OH(oh) + tmp_msg->raw_size; break; } /* end if */ /* XXX: Should also check for NULL message in front of current message... */ } /* end for */ } /* end else */ /* Add up current message's total available space */ total_size = curr_msg->raw_size + gap_size + null_size; /* Check if message is large enough to hold continuation info */ if (total_size >= cont_size) { hbool_t better = FALSE; /* Whether the current message is better than a previous one */ /* Check for first message that can be moved */ if (found_msg->msgno < 0) better = TRUE; else { /* Prioritize moving non-attributes above attributes */ /* (Even attributes with an otherwise better fit */ if (found_msg->id == H5O_ATTR_ID && curr_msg->type->id != H5O_ATTR_ID) better = TRUE; /* Either two attributes, or two non-attributes */ else { /* Take a smaller one */ if (total_size < found_msg->total_size) better = TRUE; /* If they are the same size, choose the earliest one * in the chunk array */ /* (Could also bias toward message earlier / later * chunk in, but shouldn't be a big deal - QAK, 2016/10/21) */ else if (total_size == found_msg->total_size) { if (msg_chunkno < found_msg->chunkno) better = TRUE; } /* end else-if */ } /* end else */ } /* end else */ /* If we found a better message, keep its info */ if (better) { found_msg->msgno = (int)u; found_msg->id = curr_msg->type->id; found_msg->chunkno = msg_chunkno; found_msg->gap_size = gap_size; found_msg->null_size = null_size; found_msg->total_size = total_size; found_msg->null_msgno = null_msgno; } /* end if */ } /* end if */ else if (found_msg->msgno < 0 && msg_chunkno == oh->nchunks - 1) /* Keep track of the total size of smaller messages in the last * chunk, in case we need to move more than 1 message. */ multi_size += curr_msg->raw_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh); } /* end if */ } /* end for */ /* * 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 other messages first, and attributes only as a last resort. * * If all else fails, move every message in the last chunk. * */ if (found_msg->msgno < 0) *size += multi_size; else *size += (size_t)H5O_SIZEOF_MSGHDR_OH(oh) + oh->mesg[found_msg->msgno].raw_size; FUNC_LEAVE_NOAPI(SUCCEED) } /* H5O__alloc_find_best_nonnull() */ /*------------------------------------------------------------------------- * Function: H5O__alloc_chunk * * Purpose: Allocates and initializes a new chunk for the object header, * including file space. * * Return: Success: SUCCEED, with chunk number for the * new chunk and a pointer to the location in its * image where the first message should be placed. * * Failure: Negative * * Programmer: Quincey Koziol * Oct 21 2016 * *------------------------------------------------------------------------- */ herr_t H5O__alloc_chunk(H5F_t *f, H5O_t *oh, size_t size, size_t found_null, const H5O_msg_alloc_info_t *found_msg, size_t *new_idx) { H5O_mesg_t *curr_msg; /* Pointer to current message to operate on */ H5O_chunk_proxy_t *chk_proxy; /* Chunk that message is in */ size_t cont_size; /*continuation message size */ size_t idx; /* Message number */ uint8_t *p = NULL; /* Pointer into new chunk image */ H5O_cont_t *cont = NULL; /*native continuation message */ unsigned chunkno; /* Chunk allocated */ haddr_t new_chunk_addr; /* Address of new chunk in file */ unsigned u; /* Local index variable */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_PACKAGE /* check args */ HDassert(f); HDassert(oh); HDassert(found_msg); HDassert(new_idx); /* * The total chunk size must include the requested space plus enough * for the message header. This must be at least some minimum and * aligned properly. */ size = MAX(H5O_MIN_SIZE, size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh)); HDassert(size == H5O_ALIGN_OH(oh, size)); /* * 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); /* Allocate space in file to hold the new chunk */ new_chunk_addr = H5MF_alloc(f, H5FD_MEM_OHDR, (hsize_t)size); if (!H5F_addr_defined(new_chunk_addr)) HGOTO_ERROR(H5E_OHDR, H5E_CANTALLOC, FAIL, "unable to allocate space for new chunk") /* Create the new chunk giving it a file address. */ if (oh->nchunks >= oh->alloc_nchunks) { size_t na = MAX(H5O_NCHUNKS, oh->alloc_nchunks * 2); /* Double # of chunks allocated */ H5O_chunk_t *x; if (NULL == (x = H5FL_SEQ_REALLOC(H5O_chunk_t, oh->chunk, na))) HGOTO_ERROR(H5E_OHDR, H5E_CANTALLOC, FAIL, "can't allocate larger chunk array, na = %zu", na) oh->alloc_nchunks = na; oh->chunk = x; } /* end if */ H5_CHECKED_ASSIGN(chunkno, unsigned, oh->nchunks, size_t); oh->nchunks++; 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_OHDR, H5E_CANTALLOC, FAIL, "can't allocate image for chunk, size = %zu", size) oh->chunk[chunkno].chunk_proxy = NULL; /* 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) { H5MM_memcpy(p, H5O_CHK_MAGIC, (size_t)H5_SIZEOF_MAGIC); p += H5_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, FAIL, "can't allocate more space for messages") /* Check if we need to move multiple messages, in order to make room for the new message */ cont_size = H5O_ALIGN_OH(oh, (size_t)(H5F_SIZEOF_ADDR(f) + H5F_SIZEOF_SIZE(f))); if (found_null >= oh->nmesgs) { if (found_msg->msgno < 0) { /* Move all non-null messages in the last chunk to the new chunk. This * should be extremely rare so we don't care too much about minimizing * the space used. */ H5O_mesg_t *null_msg; /* Pointer to new null message */ /* Protect last chunk */ if (NULL == (chk_proxy = H5O__chunk_protect(f, oh, chunkno - 1))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load object header chunk") /* Copy each message to the new location */ for (u = 0, curr_msg = &oh->mesg[0]; u < oh->nmesgs; u++, curr_msg++) if (curr_msg->chunkno == chunkno - 1) { if (curr_msg->type->id == H5O_NULL_ID) { /* Delete the null message */ if (u < oh->nmesgs - 1) HDmemmove(curr_msg, curr_msg + 1, ((oh->nmesgs - 1) - u) * sizeof(H5O_mesg_t)); oh->nmesgs--; } /* end if */ else { HDassert(curr_msg->type->id != H5O_CONT_ID); /* Copy the raw data */ H5MM_memcpy(p, curr_msg->raw - (size_t)H5O_SIZEOF_MSGHDR_OH(oh), curr_msg->raw_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh)); /* Update the message info */ curr_msg->chunkno = chunkno; curr_msg->raw = p + H5O_SIZEOF_MSGHDR_OH(oh); /* Account for copied message in new chunk */ p += (size_t)H5O_SIZEOF_MSGHDR_OH(oh) + curr_msg->raw_size; size -= (size_t)H5O_SIZEOF_MSGHDR_OH(oh) + curr_msg->raw_size; } /* end else */ } /* end if */ /* Create a null message spanning the entire last chunk */ 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->chunk[chunkno - 1].image + ((chunkno == 1) ? H5O_SIZEOF_HDR(oh) : H5O_SIZEOF_CHKHDR_OH(oh)) - H5O_SIZEOF_CHKSUM_OH(oh) + H5O_SIZEOF_MSGHDR_OH(oh); null_msg->raw_size = oh->chunk[chunkno - 1].size - ((chunkno == 1) ? (size_t)H5O_SIZEOF_HDR(oh) : (size_t)H5O_SIZEOF_CHKHDR_OH(oh)) - (size_t)H5O_SIZEOF_MSGHDR_OH(oh); null_msg->chunkno = chunkno - 1; HDassert(null_msg->raw_size >= cont_size); /* Remove any gap in the chunk */ oh->chunk[chunkno - 1].gap = 0; /* Release chunk, marking it dirty */ if (H5O__chunk_unprotect(f, chk_proxy, TRUE) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") } /* end if */ else { /* Move message (that will be replaced with continuation message) * to new chunk, if necessary. */ H5O_mesg_t *null_msg; /* Pointer to new null message */ /* Protect chunk */ if (NULL == (chk_proxy = H5O__chunk_protect(f, oh, oh->mesg[found_msg->msgno].chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load object header chunk") /* 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->native = NULL; null_msg->raw = oh->mesg[found_msg->msgno].raw; null_msg->raw_size = oh->mesg[found_msg->msgno].raw_size; null_msg->chunkno = oh->mesg[found_msg->msgno].chunkno; /* Copy the message to move (& its prefix) to its new location */ H5MM_memcpy(p, oh->mesg[found_msg->msgno].raw - H5O_SIZEOF_MSGHDR_OH(oh), oh->mesg[found_msg->msgno].raw_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh)); /* Switch moved message to point to new location */ oh->mesg[found_msg->msgno].raw = p + H5O_SIZEOF_MSGHDR_OH(oh); oh->mesg[found_msg->msgno].chunkno = chunkno; /* Account for copied message in new chunk */ p += (size_t)H5O_SIZEOF_MSGHDR_OH(oh) + oh->mesg[found_msg->msgno].raw_size; size -= (size_t)H5O_SIZEOF_MSGHDR_OH(oh) + oh->mesg[found_msg->msgno].raw_size; /* Add any available space after the message to move to the new null message */ if (found_msg->gap_size > 0) { /* Absorb a gap after the moved message */ HDassert(oh->chunk[null_msg->chunkno].gap == found_msg->gap_size); null_msg->raw_size += found_msg->gap_size; oh->chunk[null_msg->chunkno].gap = 0; } /* end if */ else if (found_msg->null_size > 0) { H5O_mesg_t *old_null_msg = &oh->mesg[found_msg->null_msgno]; /* Pointer to NULL message to eliminate */ /* Absorb a null message after the moved message */ HDassert((null_msg->raw + null_msg->raw_size) == (old_null_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh))); null_msg->raw_size += found_msg->null_size; /* Release any information/memory for message */ H5O__msg_free_mesg(old_null_msg); /* Remove null message from list of messages */ if (found_msg->null_msgno < (oh->nmesgs - 1)) HDmemmove(old_null_msg, old_null_msg + 1, ((oh->nmesgs - 1) - found_msg->null_msgno) * sizeof(H5O_mesg_t)); /* Decrement # of messages */ /* (Don't bother reducing size of message array for now -QAK) */ oh->nmesgs--; /* Adjust message index for new NULL message */ found_null--; } /* end if */ /* Mark the new null message as dirty */ null_msg->dirty = TRUE; /* Release chunk, marking it dirty */ if (H5O__chunk_unprotect(f, chk_proxy, TRUE) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") } /* end if */ } /* end if */ /* 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 - (size_t)(H5O_SIZEOF_CHKHDR_OH(oh) + H5O_SIZEOF_MSGHDR_OH(oh)); oh->mesg[idx].chunkno = chunkno; /* Insert the new chunk into the cache */ if (H5O__chunk_add(f, oh, chunkno, oh->mesg[found_null].chunkno) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, FAIL, "can't add new chunk to cache") /* Initialize the continuation information */ if (NULL == (cont = H5FL_MALLOC(H5O_cont_t))) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "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(f, oh, found_null, H5O_MSG_CONT, cont, cont_size) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, FAIL, "can't split null message") /* Set new message index value */ *new_idx = idx; done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O__alloc_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. * * Note: The algorithm for finding a message to replace with a * continuation message is still fairly limited. It's possible * that two (or more) messages smaller than a continuation message * might occupy a chunk and need to be moved in order to make * room for the continuation message. * * Also, we aren't checking for NULL messages in front of another * message right now... * * 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 * Aug 7 1997 * *------------------------------------------------------------------------- */ static herr_t H5O__alloc_new_chunk(H5F_t *f, H5O_t *oh, size_t size, size_t *new_idx) { size_t cont_size; /*continuation message size */ size_t idx; /* Message number */ H5O_msg_alloc_info_t found_msg; /* Best fit non-null message */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_PACKAGE /* check args */ HDassert(oh); HDassert(size > 0); size = H5O_ALIGN_OH(oh, size); /* Find the smallest null message that could hold a continuation message */ idx = oh->nmesgs; cont_size = H5O_ALIGN_OH(oh, (size_t)(H5F_SIZEOF_ADDR(f) + H5F_SIZEOF_SIZE(f))); if (H5O__alloc_find_best_null(oh, cont_size, &idx) < 0) HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "error while locating best null header message") /* If we couldn't find a null message, locate the best message to move to new chunk */ if (idx >= oh->nmesgs) { found_msg.msgno = -1; if (H5O__alloc_find_best_nonnull(f, oh, &size, &found_msg) < 0) HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "error while locating best non-null header message") } /* end if */ /* Allocate and initialize new chunk in the file */ if (H5O__alloc_chunk(f, oh, size, idx, &found_msg, new_idx) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTALLOC, FAIL, "can't allocate new object header chunk") done: FUNC_LEAVE_NOAPI(ret_value) } /* H5O__alloc_new_chunk() */ /*------------------------------------------------------------------------- * Function: H5O__alloc_find_best_null * * Purpose: Find the best fit null message for a given size of message * to allocate. * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * Oct 21 2016 * *------------------------------------------------------------------------- */ static herr_t H5O__alloc_find_best_null(const H5O_t *oh, size_t size, size_t *mesg_idx) { size_t idx; /* Index of message which fits allocation */ ssize_t found_null; /* Best fit null message */ FUNC_ENTER_PACKAGE_NOERR /* check args */ HDassert(oh); HDassert(size > 0); HDassert(mesg_idx); /* Find the smallest null message that could hold the new object header message */ found_null = -1; for (idx = 0; idx < oh->nmesgs; idx++) { if (H5O_NULL_ID == oh->mesg[idx].type->id) { /* If we found an exact fit, use it */ if (oh->mesg[idx].raw_size == size) { /* Keep first exact fit */ if (found_null < 0) found_null = (ssize_t)idx; else /* If we've got more than one exact fit, choose the one in the earliest chunk */ if (oh->mesg[idx].chunkno < oh->mesg[found_null].chunkno) { found_null = (ssize_t)idx; /* If we found an exact fit in object header chunk #0, we can get out */ /* (Could extend this to look for earliest message in * chunk #0 - QAK, 2016/10/21) */ if (0 == oh->mesg[idx].chunkno) break; } /* end if */ } /* end if */ /* Look for null message that's larger than needed */ else if (oh->mesg[idx].raw_size > size) { /* Keep first one found */ if (found_null < 0) found_null = (ssize_t)idx; /* Check for better fit */ else if (oh->mesg[idx].raw_size < oh->mesg[found_null].raw_size) { found_null = (ssize_t)idx; } else { /* If they are the same size, choose the one in the earliest chunk */ if (oh->mesg[idx].raw_size == oh->mesg[found_null].raw_size) { if (oh->mesg[idx].chunkno < oh->mesg[found_null].chunkno) found_null = (ssize_t)idx; } /* end if */ } /* end else */ } /* end else-if */ /* else: Ignore too-small null messages */ } /* end if */ } /* end for */ if (found_null >= 0) *mesg_idx = (size_t)found_null; FUNC_LEAVE_NOAPI(SUCCEED) } /* H5O__alloc_find_best_null() */ /*------------------------------------------------------------------------- * Function: H5O__alloc * * Purpose: Allocate enough space in the object header for this message. * * Return: Non-negative on success/Negative on failure * * Programmer: Robb Matzke * Aug 6 1997 * *------------------------------------------------------------------------- */ herr_t H5O__alloc(H5F_t *f, H5O_t *oh, const H5O_msg_class_t *type, const void *mesg, size_t *mesg_idx) { size_t raw_size; /* Raw size of message */ size_t aligned_size; /* Size of message including alignment */ size_t idx; /* Index of message which fits allocation */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_PACKAGE /* check args */ HDassert(oh); HDassert(type); HDassert(mesg); HDassert(mesg_idx); /* Compute the size needed to store the message in the object header */ raw_size = (type->raw_size)(f, FALSE, mesg); if (0 == raw_size) HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "can't compute object header message size") if (raw_size >= H5O_MESG_MAX_SIZE) HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "object header message is too large") aligned_size = H5O_ALIGN_OH(oh, raw_size); /* Find the smallest null message that could hold the new object header message */ idx = oh->nmesgs; if (H5O__alloc_find_best_null(oh, aligned_size, &idx) < 0) HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "error while locating best null header message") /* 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; /* Status from attempting to extend chunk */ if ((tri_result = H5O__alloc_extend_chunk(f, oh, chunkno, raw_size, &idx)) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTEXTEND, FAIL, "can't extend existing chunk") if (tri_result == TRUE) break; } /* end for */ /* If we were not able to extend a chunk, create a new one */ if (idx >= oh->nmesgs) if (H5O__alloc_new_chunk(f, oh, raw_size, &idx) < 0) HGOTO_ERROR(H5E_OHDR, H5E_NOSPACE, FAIL, "unable to create a new object header data chunk") } /* end if */ HDassert(idx < oh->nmesgs); /* Split the null message and point at continuation message */ if (H5O__alloc_null(f, oh, idx, type, NULL, aligned_size) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, FAIL, "can't split null message") /* Mark object header as dirty in cache */ if (H5AC_mark_entry_dirty(oh) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTMARKDIRTY, FAIL, "unable to mark object header as dirty") /* Set message index value */ *mesg_idx = 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 * Oct 22 2006 * *------------------------------------------------------------------------- */ herr_t H5O__release_mesg(H5F_t *f, H5O_t *oh, H5O_mesg_t *mesg, hbool_t adj_link) { H5O_chunk_proxy_t *chk_proxy = NULL; /* Chunk that message is in */ hbool_t chk_dirtied = FALSE; /* Flag for unprotecting chunk */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_PACKAGE /* check args */ HDassert(f); HDassert(oh); HDassert(mesg); /* Check if we should operate on the message */ if (adj_link) /* Free any space referred to in the file from this message */ if (H5O__delete_mesg(f, oh, mesg) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTDELETE, FAIL, "unable to delete file space for object header message") /* Protect chunk */ if (NULL == (chk_proxy = H5O__chunk_protect(f, oh, mesg->chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to protect object header chunk") /* 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; /* Mark the message as modified */ mesg->dirty = TRUE; chk_dirtied = 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, &chk_dirtied, 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") } /* end if */ done: /* Release chunk, if not already done */ if (chk_proxy && H5O__chunk_unprotect(f, chk_proxy, chk_dirtied) < 0) HDONE_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") FUNC_LEAVE_NOAPI(ret_value) } /* H5O__release_mesg() */ /*------------------------------------------------------------------------- * Function: H5O__move_cont * * Purpose: Check and move message(s) forward into a continuation message * * Return: Success: non-negative (TRUE/FALSE) * Failure: negative * * Programmer: Vailin Choi * Feb. 2009 * *------------------------------------------------------------------------- */ static htri_t H5O__move_cont(H5F_t *f, H5O_t *oh, unsigned cont_u) { H5O_chunk_proxy_t *chk_proxy = NULL; /* Chunk that continuation message is in */ H5O_mesg_t *cont_msg; /* Pointer to the continuation message */ unsigned deleted_chunkno; /* Chunk # to delete */ hbool_t chk_dirtied = FALSE; /* Flags for unprotecting chunk */ htri_t ret_value = TRUE; /* Return value */ FUNC_ENTER_PACKAGE /* Check arguments. */ HDassert(f); HDassert(oh); /* Get initial information */ cont_msg = &oh->mesg[cont_u]; H5O_LOAD_NATIVE(f, 0, oh, cont_msg, FAIL) deleted_chunkno = ((H5O_cont_t *)(cont_msg->native))->chunkno; /* Check if continuation message is pointing to the last chunk */ if (deleted_chunkno == (oh->nchunks - 1)) { size_t nonnull_size; /* Total size of nonnull messages in the chunk pointed to by cont message */ H5O_mesg_t *curr_msg; /* Pointer to the current message to operate on */ size_t gap_size; /* Size of gap produced */ size_t v; /* Local index variable */ /* Spin through messages */ nonnull_size = 0; for (v = 0, curr_msg = &oh->mesg[0]; v < oh->nmesgs; v++, curr_msg++) { if (curr_msg->chunkno == deleted_chunkno) { /* Find size of all non-null messages in the chunk pointed to by the continuation message */ if (curr_msg->type->id != H5O_NULL_ID) { HDassert(curr_msg->type->id != H5O_CONT_ID); nonnull_size += curr_msg->raw_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh); } /* end if */ } /* end if */ } /* end for */ /* Size of gap in chunk w/continuation message */ gap_size = oh->chunk[cont_msg->chunkno].gap; /* Check if messages can fit into the continuation message + gap size */ /* (Could count any null messages in the chunk w/the continuation * message also, but that is pretty complex. -QAK) */ if (nonnull_size && nonnull_size <= (gap_size + cont_msg->raw_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh))) { uint8_t *move_start, *move_end; /* Pointers to area of messages to move */ unsigned cont_chunkno; /* Chunk number for continuation message */ /* Get continuation info */ move_start = cont_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh); move_end = cont_msg->raw + cont_msg->raw_size; cont_chunkno = cont_msg->chunkno; /* Convert continuation message into a null message. Do not delete * the target chunk yet, so we can still copy messages from it. */ if (H5O__release_mesg(f, oh, cont_msg, FALSE) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTDELETE, FAIL, "unable to convert into null message") /* Protect chunk */ if (NULL == (chk_proxy = H5O__chunk_protect(f, oh, cont_chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to protect object header chunk") /* Move message(s) forward into continuation message */ for (v = 0, curr_msg = &oh->mesg[0]; v < oh->nmesgs; v++, curr_msg++) /* Look for messages in chunk to delete */ if (curr_msg->chunkno == deleted_chunkno) { /* Move messages out of chunk to delete */ if (curr_msg->type->id != H5O_NULL_ID) { size_t move_size; /* Size of the message to be moved */ /* Compute size of message to move */ move_size = curr_msg->raw_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh); /* Move message out of deleted chunk */ H5MM_memcpy(move_start, curr_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh), move_size); curr_msg->raw = move_start + H5O_SIZEOF_MSGHDR_OH(oh); curr_msg->chunkno = cont_chunkno; chk_dirtied = TRUE; /* Adjust location to move messages to */ move_start += move_size; } /* end else */ } /* end if */ /* Delete the target chunk */ if (H5O__chunk_delete(f, oh, deleted_chunkno) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTDELETE, FAIL, "unable to remove chunk from cache") HDassert(move_start <= (move_end + gap_size)); /* Check if there is space remaining in the continuation message */ /* (The remaining space can be gap or a null message) */ gap_size += (size_t)(move_end - move_start); if (gap_size >= (size_t)H5O_SIZEOF_MSGHDR_OH(oh)) { /* Adjust size of null (was continuation) message */ cont_msg->raw_size = gap_size - (size_t)H5O_SIZEOF_MSGHDR_OH(oh); cont_msg->raw = move_start + H5O_SIZEOF_MSGHDR_OH(oh); cont_msg->dirty = TRUE; chk_dirtied = TRUE; } /* end if */ else { /* Check if there is space that should be a gap */ if (gap_size > 0) { /* Convert remnant into gap in chunk */ if (H5O__add_gap(f, oh, cont_chunkno, &chk_dirtied, cont_u, move_start, gap_size) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, FAIL, "can't insert gap in chunk") } /* end if */ /* Release any information/memory for continuation message */ H5O__msg_free_mesg(cont_msg); if (cont_u < (oh->nmesgs - 1)) HDmemmove(&oh->mesg[cont_u], &oh->mesg[cont_u + 1], ((oh->nmesgs - 1) - cont_u) * sizeof(H5O_mesg_t)); oh->nmesgs--; } /* end else */ /* Move message(s) forward into continuation message */ /* Note: unsigned v wrapping around at the end */ for (v = oh->nmesgs - 1, curr_msg = &oh->mesg[v]; v < oh->nmesgs; v--, curr_msg--) /* Look for messages in chunk to delete */ if (curr_msg->chunkno == deleted_chunkno) { /* Remove all null messages in deleted chunk from list of messages */ if (curr_msg->type->id == H5O_NULL_ID) { /* Release any information/memory for message */ H5O__msg_free_mesg(curr_msg); chk_dirtied = TRUE; /* Remove from message list */ if (v < (oh->nmesgs - 1)) HDmemmove(&oh->mesg[v], &oh->mesg[v + 1], ((oh->nmesgs - 1) - v) * sizeof(H5O_mesg_t)); oh->nmesgs--; } /* end if */ } /* end if */ /* Remove chunk from list of chunks */ oh->chunk[deleted_chunkno].image = H5FL_BLK_FREE(chunk_image, oh->chunk[deleted_chunkno].image); oh->nchunks--; } /* end if */ else ret_value = FALSE; } /* end if */ else ret_value = FALSE; done: /* Release chunk, if not already done */ if (chk_proxy && H5O__chunk_unprotect(f, chk_proxy, chk_dirtied) < 0) HDONE_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") FUNC_LEAVE_NOAPI(ret_value) } /* H5O__move_cont() */ /*------------------------------------------------------------------------- * * Function: H5O__move_msgs_forward * * Purpose: Move messages toward first chunk * * Return: Non-negative on success/Negative on failure * * Programmer: Quincey Koziol * Oct 17 2005 * *------------------------------------------------------------------------- */ static htri_t H5O__move_msgs_forward(H5F_t *f, H5O_t *oh) { H5O_chunk_proxy_t *null_chk_proxy = NULL; /* Chunk that null message is in */ H5O_chunk_proxy_t *curr_chk_proxy = NULL; /* Chunk that message is in */ H5O_chunk_proxy_t *cont_targ_chk_proxy = NULL; /* Chunk that continuation message points to */ hbool_t null_chk_dirtied = FALSE; /* Flags for unprotecting null chunk */ hbool_t curr_chk_dirtied = FALSE; /* Flags for unprotecting curr chunk */ 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 = FAIL; /* Return value */ FUNC_ENTER_PACKAGE /* 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) { /* Protect chunk */ if (NULL == (null_chk_proxy = H5O__chunk_protect(f, oh, curr_msg->chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load object header chunk") /* 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 + (size_t)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) */ curr_msg->dirty = TRUE; /* Release chunk, marking it dirty */ if (H5O__chunk_unprotect(f, null_chk_proxy, TRUE) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") null_chk_proxy = NULL; /* 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 */ size_t v; /* Local index variable */ /* Check if messages in chunk pointed to can replace continuation message */ if (H5O_CONT_ID == curr_msg->type->id) { htri_t status; /* Status from moving messages */ if ((status = H5O__move_cont(f, oh, u)) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTDELETE, FAIL, "Error in moving messages into cont message") else if (status > 0) { /* Message(s) got moved into "continuation" message */ packed_msg = TRUE; break; } /* end else-if */ } /* end if */ /* 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; /* Protect chunks */ if (NULL == (null_chk_proxy = H5O__chunk_protect(f, oh, null_msg->chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load object header chunk") if (NULL == (curr_chk_proxy = H5O__chunk_protect(f, oh, curr_msg->chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load object header chunk") /* If the message being moved is a continuation * message and we are doing SWMR writes, we must * update the flush dependencies */ if (oh->swmr_write && (H5O_CONT_ID == curr_msg->type->id)) { void *null_chk_mdc_obj; /* The metadata cache object for the null_msg chunk */ /* Point to the metadata cache object for the * null message chunk, oh if in chunk 0 or the * proxy otherwise */ null_chk_mdc_obj = (null_msg->chunkno == 0 ? (void *)oh : (void *)null_chk_proxy); /* The other chunks involved should never be * chunk 0 */ HDassert(curr_msg->chunkno > 0); HDassert(((H5O_cont_t *)(curr_msg->native))->chunkno > 0); /* Protect continuation message target chunk */ if (NULL == (cont_targ_chk_proxy = H5O__chunk_protect( f, oh, ((H5O_cont_t *)(curr_msg->native))->chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load object header chunk") /* Check for flush dependency on previous continuation chunk */ /* (As opposed to chunk 0) */ if (cont_targ_chk_proxy->fd_parent) { /* Remove flush dependency on old continuation * message chunk */ HDassert(cont_targ_chk_proxy); HDassert(curr_chk_proxy); HDassert((void *)curr_chk_proxy == cont_targ_chk_proxy->fd_parent); if (H5AC_destroy_flush_dependency(curr_chk_proxy, cont_targ_chk_proxy) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNDEPEND, FAIL, "unable to destroy flush dependency") cont_targ_chk_proxy->fd_parent = NULL; } /* end if */ /* Avoid (another) flush dependency on chunk 0 */ if (0 != null_msg->chunkno) { /* Sanity checks */ HDassert(null_chk_mdc_obj); HDassert(((H5C_cache_entry_t *)null_chk_mdc_obj)->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC); HDassert(((H5C_cache_entry_t *)null_chk_mdc_obj)->type); HDassert(((H5C_cache_entry_t *)null_chk_mdc_obj)->type->id == H5AC_OHDR_CHK_ID); /* Create flush dependency on new continuation * message chunk */ if (H5AC_create_flush_dependency(null_chk_mdc_obj, cont_targ_chk_proxy) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTDEPEND, FAIL, "unable to create flush dependency") cont_targ_chk_proxy->fd_parent = null_chk_mdc_obj; } /* end if */ /* Unprotect continuation message target chunk */ if (H5O__chunk_unprotect(f, cont_targ_chk_proxy, FALSE) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") cont_targ_chk_proxy = NULL; } /* end if */ /* Copy raw data for non-null message to new chunk */ H5MM_memcpy(null_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh), curr_msg->raw - H5O_SIZEOF_MSGHDR_OH(oh), curr_msg->raw_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh)); /* Point non-null message at null message's space */ curr_msg->chunkno = null_msg->chunkno; curr_msg->raw = null_msg->raw; curr_chk_dirtied = TRUE; /* 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; null_chk_dirtied = TRUE; /* Release current chunk, marking it dirty */ if (H5O__chunk_unprotect(f, curr_chk_proxy, curr_chk_dirtied) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") curr_chk_proxy = NULL; curr_chk_dirtied = FALSE; /* Check for gap in null message's chunk */ if (oh->chunk[old_chunkno].gap > 0) { /* Eliminate the gap in the chunk */ if (H5O__eliminate_gap( oh, &null_chk_dirtied, 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") } /* end if */ /* Release null chunk, marking it dirty */ if (H5O__chunk_unprotect(f, null_chk_proxy, null_chk_dirtied) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") null_chk_proxy = NULL; null_chk_dirtied = FALSE; } /* end if */ else { size_t 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; /* Mark null message dirty */ null_msg->dirty = TRUE; null_chk_dirtied = TRUE; /* Add the gap to the chunk */ if (H5O__add_gap(f, oh, null_msg->chunkno, &null_chk_dirtied, 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 + (size_t)H5O_SIZEOF_MSGHDR_OH(oh); null_msg->raw_size -= curr_msg->raw_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh); /* Mark null message dirty */ null_msg->dirty = TRUE; null_chk_dirtied = 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 */ /* Release null message's chunk, marking it dirty */ if (H5O__chunk_unprotect(f, null_chk_proxy, null_chk_dirtied) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") null_chk_proxy = NULL; null_chk_dirtied = FALSE; /* 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].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; /* Mark new null message dirty */ oh->mesg[new_null_msg].dirty = TRUE; curr_chk_dirtied = TRUE; /* 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, &curr_chk_dirtied, &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") } /* end if */ /* Release new null message's chunk, marking it dirty */ if (H5O__chunk_unprotect(f, curr_chk_proxy, curr_chk_dirtied) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") curr_chk_proxy = NULL; curr_chk_dirtied = FALSE; } /* 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 = (htri_t)did_packing; done: if (ret_value < 0) { if (null_chk_proxy && H5O__chunk_unprotect(f, null_chk_proxy, null_chk_dirtied) < 0) HDONE_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect null object header chunk") if (curr_chk_proxy && H5O__chunk_unprotect(f, curr_chk_proxy, curr_chk_dirtied) < 0) HDONE_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect current object header chunk") if (cont_targ_chk_proxy && H5O__chunk_unprotect(f, cont_targ_chk_proxy, FALSE) < 0) HDONE_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect continuation message target object header chunk") } /* end if */ else HDassert(!null_chk_proxy && !curr_chk_proxy && !cont_targ_chk_proxy); 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 * Oct 10 2005 * *------------------------------------------------------------------------- */ static htri_t H5O__merge_null(H5F_t *f, 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 = FAIL; /* Return value */ FUNC_ENTER_PACKAGE /* 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) { ssize_t adj_raw = 0; /* Amount to adjust raw message pointer */ size_t adj_raw_size = 0; /* Amount to adjust raw message size */ /* 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 */ adj_raw = 0; adj_raw_size = (size_t)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 */ adj_raw = -((ssize_t)((size_t)H5O_SIZEOF_MSGHDR_OH(oh) + curr_msg2->raw_size)); adj_raw_size = (size_t)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) { H5O_chunk_proxy_t *curr_chk_proxy; /* Chunk that message is in */ htri_t result; /* Release any information/memory for second message */ H5O__msg_free_mesg(curr_msg2); /* Protect chunk */ if (NULL == (curr_chk_proxy = H5O__chunk_protect(f, oh, curr_msg->chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load object header chunk") /* Adjust first message address and extend length to cover second message */ curr_msg->raw += adj_raw; curr_msg->raw_size += adj_raw_size; /* Mark first message as dirty */ curr_msg->dirty = TRUE; /* Release new null message's chunk, marking it dirty */ if (H5O__chunk_unprotect(f, curr_chk_proxy, TRUE) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") /* 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--; /* The merge null message might span the entire chunk: scan for empty chunk to * remove */ if ((result = H5O__remove_empty_chunks(f, oh)) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTPACK, FAIL, "can't remove empty chunk") else if (result > 0) /* Get out of loop */ break; /* If the merged message is too large, shrink the chunk */ if (curr_msg->raw_size >= H5O_MESG_MAX_SIZE) if (H5O__alloc_shrink_chunk(f, oh, curr_msg->chunkno) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTPACK, FAIL, "unable to shrink chunk") /* 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 = (htri_t)did_merging; done: 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 * Oct 17 2005 * *------------------------------------------------------------------------- */ static htri_t H5O__remove_empty_chunks(H5F_t *f, H5O_t *oh) { hbool_t deleted_chunk; /* Whether to a chunk was deleted */ hbool_t did_deleting = FALSE; /* Whether any chunks were deleted */ htri_t ret_value = FAIL; /* Return value */ FUNC_ENTER_PACKAGE /* 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 && ((size_t)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 */ H5O_LOAD_NATIVE(f, 0, oh, cont_msg, FAIL) /* Check if the chunkno needs to be set */ /* (should only occur when the continuation message is first decoded) */ if (0 == ((H5O_cont_t *)(cont_msg->native))->chunkno) { unsigned w; /* Local index variable */ /* Find chunk that this continuation message points to */ for (w = 0; w < oh->nchunks; w++) if (oh->chunk[w].addr == ((H5O_cont_t *)(cont_msg->native))->addr) { ((H5O_cont_t *)(cont_msg->native))->chunkno = w; break; } /* end if */ HDassert(((H5O_cont_t *)(cont_msg->native))->chunkno > 0); } /* 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); HDassert(((H5O_cont_t *)(cont_msg->native))->chunkno == null_msg->chunkno); /* 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, oh, cont_msg, 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 */ oh->chunk[null_msg->chunkno].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)); /* Adjust chunk number for any chunk proxies that are in the cache */ for (u = null_msg->chunkno; u < (oh->nchunks - 1); u++) { unsigned chk_proxy_status = 0; /* Metadata cache status of chunk proxy for chunk */ /* Check the chunk proxy's status in the metadata cache */ if (H5AC_get_entry_status(f, oh->chunk[u].addr, &chk_proxy_status) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "unable to check metadata cache status for chunk proxy") /* If the entry is in the cache, update its chunk index */ if (chk_proxy_status & H5AC_ES__IN_CACHE) { if (H5O__chunk_update_idx(f, oh, u) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTSET, FAIL, "unable to update index for chunk proxy") } /* end if */ } /* end for */ } /* end if */ /* 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++) { /* Sanity check - there should be no messages in deleted chunk */ HDassert(curr_msg->chunkno != deleted_chunkno); /* Adjust chunk index for messages in later chunks */ if (curr_msg->chunkno > deleted_chunkno) curr_msg->chunkno--; /* Check for continuation message */ if (H5O_CONT_ID == curr_msg->type->id) { /* Decode current continuation message if necessary */ H5O_LOAD_NATIVE(f, 0, oh, curr_msg, FAIL) /* Check if the chunkno needs to be set */ /* (should only occur when the continuation message is first decoded) */ if (0 == ((H5O_cont_t *)(curr_msg->native))->chunkno) { unsigned w; /* Local index variable */ /* Find chunk that this continuation message points to */ for (w = 0; w < oh->nchunks; w++) if (oh->chunk[w].addr == ((H5O_cont_t *)(curr_msg->native))->addr) { ((H5O_cont_t *)(curr_msg->native))->chunkno = w; break; } /* end if */ HDassert(((H5O_cont_t *)(curr_msg->native))->chunkno > 0); } /* end if */ else { /* Check for pointer to chunk after deleted chunk */ if (((H5O_cont_t *)(curr_msg->native))->chunkno > deleted_chunkno) ((H5O_cont_t *)(curr_msg->native))->chunkno--; } /* end else */ } /* end if */ } /* 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 = (htri_t)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 * Oct 4 2005 * *------------------------------------------------------------------------- */ herr_t H5O__condense_header(H5F_t *f, H5O_t *oh) { 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_PACKAGE /* 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(f, 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(f, 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); 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() */ /*------------------------------------------------------------------------- * * Function: H5O__alloc_shrink_chunk * * Purpose: Shrinks a chunk, removing all null messages and any gap. * * Return: Non-negative on success/Negative on failure * * Programmer: Neil Fortner * Oct 20 2008 * *------------------------------------------------------------------------- */ static herr_t H5O__alloc_shrink_chunk(H5F_t *f, H5O_t *oh, unsigned chunkno) { H5O_chunk_t *chunk = &oh->chunk[chunkno]; /* Chunk to shrink */ H5O_chunk_proxy_t *chk_proxy = NULL; /* Metadata cache proxy for chunk to shrink */ H5O_mesg_t *curr_msg; /* Current message to examine */ uint8_t *old_image = chunk->image; /* Old address of chunk's image in memory */ size_t old_size = chunk->size; /* Old size of chunk */ size_t new_size = chunk->size - chunk->gap; /* Size of shrunk chunk */ size_t total_msg_size; /* Size of the messages in this chunk */ size_t min_chunk_size = H5O_ALIGN_OH(oh, H5O_MIN_SIZE); /* Minimum chunk size */ size_t sizeof_chksum = H5O_SIZEOF_CHKSUM_OH(oh); /* Size of chunk checksum */ size_t sizeof_msghdr = H5O_SIZEOF_MSGHDR_OH(oh); /* Size of message header */ uint8_t new_size_flags = 0; /* New chunk #0 size flags */ hbool_t adjust_size_flags = FALSE; /* Whether to adjust the chunk #0 size flags */ size_t less_prfx_size = 0; /* Bytes removed from object header prefix */ size_t u; /* Index */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_PACKAGE /* check args */ HDassert(f); HDassert(oh); /* Protect chunk */ if (NULL == (chk_proxy = H5O__chunk_protect(f, oh, chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to protect object header chunk") /* Loop backwards to increase the chance of seeing more null messages at the * end of the chunk. Note that we rely on unsigned u wrapping around at the * end. */ for (u = oh->nmesgs - 1, curr_msg = &oh->mesg[u]; u < oh->nmesgs; u--, curr_msg--) { if ((H5O_NULL_ID == curr_msg->type->id) && (chunkno == curr_msg->chunkno)) { size_t shrink_size = curr_msg->raw_size + sizeof_msghdr; /* Amount to shrink the chunk by */ /* If the current message is not at the end of the chunk, copy the * data after it (except the checksum). */ if (curr_msg->raw + curr_msg->raw_size < old_image + new_size - sizeof_chksum) { unsigned v; /* Index */ H5O_mesg_t *curr_msg2; uint8_t *src = curr_msg->raw + curr_msg->raw_size; /* Source location */ /* Slide down the raw data */ HDmemmove(curr_msg->raw - sizeof_msghdr, src, (size_t)(old_image + new_size - sizeof_chksum - src)); /* Update the raw data pointers for messages after this one */ for (v = 0, curr_msg2 = &oh->mesg[0]; v < oh->nmesgs; v++, curr_msg2++) if ((chunkno == curr_msg2->chunkno) && (curr_msg2->raw > curr_msg->raw)) curr_msg2->raw -= shrink_size; } /* end if */ /* Adjust the new chunk size */ new_size -= shrink_size; /* Release any information/memory for the message */ H5O__msg_free_mesg(curr_msg); /* Remove the deleted null message from list of messages */ if (u < (oh->nmesgs - 1)) HDmemmove(&oh->mesg[u], &oh->mesg[u + 1], ((oh->nmesgs - 1) - u) * sizeof(H5O_mesg_t)); /* Decrement # of messages */ /* (Don't bother reducing size of message array for now) */ oh->nmesgs--; } /* end if */ } /* end for */ /* Check if the chunk is too small, extend if necessary */ total_msg_size = new_size - (size_t)(chunkno == 0 ? H5O_SIZEOF_HDR(oh) : H5O_SIZEOF_CHKHDR_OH(oh)); if (total_msg_size < min_chunk_size) { HDassert(oh->alloc_nmesgs > oh->nmesgs); oh->nmesgs++; /* Initialize new null message to make the chunk large enough */ curr_msg = &oh->mesg[oh->nmesgs - 1]; curr_msg->type = H5O_MSG_NULL; curr_msg->dirty = TRUE; curr_msg->native = NULL; curr_msg->raw = old_image + new_size + sizeof_msghdr - sizeof_chksum; curr_msg->raw_size = MAX(H5O_ALIGN_OH(oh, min_chunk_size - total_msg_size), sizeof_msghdr) - sizeof_msghdr; curr_msg->chunkno = chunkno; /* update the new chunk size */ new_size += curr_msg->raw_size + sizeof_msghdr; } /* end if */ /* Check for changing the chunk #0 data size enough to need adjusting the flags */ if (oh->version > H5O_VERSION_1 && chunkno == 0) { uint64_t chunk0_newsize = new_size - (size_t)H5O_SIZEOF_HDR(oh); /* New size of chunk 0's data */ size_t orig_prfx_size = (size_t)1 << (oh->flags & H5O_HDR_CHUNK0_SIZE); /* Original prefix size */ /* Check for moving to a 1-byte size encoding */ if (orig_prfx_size > 1 && chunk0_newsize <= 255) { less_prfx_size = orig_prfx_size - 1; new_size_flags = H5O_HDR_CHUNK0_1; adjust_size_flags = TRUE; } /* end if */ /* Check for moving to a 2-byte size encoding */ else if (orig_prfx_size > 2 && chunk0_newsize <= 65535) { less_prfx_size = orig_prfx_size - 2; new_size_flags = H5O_HDR_CHUNK0_2; adjust_size_flags = TRUE; } /* end if */ /* Check for moving to a 4-byte size encoding */ else if (orig_prfx_size > 4 && chunk0_newsize <= 4294967295) { less_prfx_size = orig_prfx_size - 4; new_size_flags = H5O_HDR_CHUNK0_4; adjust_size_flags = TRUE; } /* end if */ } /* end if */ if (adjust_size_flags) { /* Adjust object header prefix flags */ oh->flags = (uint8_t)(oh->flags & ~H5O_HDR_CHUNK0_SIZE); oh->flags |= new_size_flags; /* Slide chunk 0 data down */ HDmemmove(chunk->image + H5O_SIZEOF_HDR(oh) - sizeof_chksum, chunk->image + H5O_SIZEOF_HDR(oh) - sizeof_chksum + less_prfx_size, new_size - (size_t)H5O_SIZEOF_HDR(oh)); /* Adjust chunk size */ new_size -= less_prfx_size; } /* end if */ /* Allocate less memory space for chunk's image */ chunk->size = new_size; chunk->image = H5FL_BLK_REALLOC(chunk_image, old_image, chunk->size); chunk->gap = 0; if (NULL == oh->chunk[chunkno].image) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed") /* Spin through existing messages, adjusting them */ for (u = 0, curr_msg = &oh->mesg[0]; u < oh->nmesgs; u++, curr_msg++) { if (adjust_size_flags || (chunk->image != old_image)) /* Adjust raw addresses for messages in this chunk to reflect new 'image' address */ if (curr_msg->chunkno == chunkno) curr_msg->raw = chunk->image - less_prfx_size + (curr_msg->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 * its size is directly encoded in the object header) */ if (chunkno > 0 && (H5O_CONT_ID == curr_msg->type->id) && (((H5O_cont_t *)(curr_msg->native))->chunkno == chunkno)) { H5O_chunk_proxy_t *cont_chk_proxy; /* Chunk that message is in */ /* Protect chunk */ if (NULL == (cont_chk_proxy = H5O__chunk_protect(f, oh, curr_msg->chunkno))) HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to protect object header chunk") /* Adjust size of continuation message */ HDassert(((H5O_cont_t *)(curr_msg->native))->size == old_size); ((H5O_cont_t *)(curr_msg->native))->size = chunk->size; /* Flag continuation message as dirty */ curr_msg->dirty = TRUE; /* Release chunk, marking it dirty */ if (H5O__chunk_unprotect(f, cont_chk_proxy, TRUE) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") } /* end if */ } /* end for */ HDassert(new_size <= old_size); /* Resize the chunk in the cache */ if (H5O__chunk_resize(oh, chk_proxy) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTRESIZE, FAIL, "unable to resize object header chunk") /* Free the unused space in the file */ if (H5MF_xfree(f, H5FD_MEM_OHDR, chunk->addr + new_size, (hsize_t)(old_size - new_size)) < 0) HGOTO_ERROR(H5E_OHDR, H5E_CANTFREE, FAIL, "unable to shrink object header chunk") done: /* Release chunk, marking it dirty */ if (chk_proxy && H5O__chunk_unprotect(f, chk_proxy, TRUE) < 0) HDONE_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to unprotect object header chunk") FUNC_LEAVE_NOAPI(ret_value) } /* H5O__alloc_shrink_chunk() */