diff options
Diffstat (limited to 'src/H5C.c')
| -rw-r--r-- | src/H5C.c | 3205 |
1 files changed, 2308 insertions, 897 deletions
@@ -85,12 +85,23 @@ #include "H5FDprivate.h" /* File drivers */ #include "H5FLprivate.h" /* Free Lists */ #include "H5Iprivate.h" /* IDs */ +#include "H5MFprivate.h" /* File memory management */ #include "H5MMprivate.h" /* Memory management */ #include "H5Pprivate.h" /* Property lists */ #include "H5SLprivate.h" /* Skip lists */ /* + * Private macros. + */ +#if H5C_DO_MEMORY_SANITY_CHECKS +#define H5C_IMAGE_EXTRA_SPACE 8 +#define H5C_IMAGE_SANITY_VALUE "DeadBeef" +#else /* H5C_DO_MEMORY_SANITY_CHECKS */ +#define H5C_IMAGE_EXTRA_SPACE 0 +#endif /* H5C_DO_MEMORY_SANITY_CHECKS */ + +/* * Private file-scope variables. */ @@ -103,27 +114,21 @@ H5FL_DEFINE_STATIC(H5C_t); */ static herr_t H5C__auto_adjust_cache_size(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - hbool_t write_permitted, - hbool_t * first_flush_ptr); + hid_t dxpl_id, + hbool_t write_permitted); static herr_t H5C__autoadjust__ageout(H5F_t * f, + hid_t dxpl_id, double hit_rate, enum H5C_resize_status * status_ptr, size_t * new_max_cache_size_ptr, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - hbool_t write_permitted, - hbool_t * first_flush_ptr); + hbool_t write_permitted); static herr_t H5C__autoadjust__ageout__cycle_epoch_marker(H5C_t * cache_ptr); static herr_t H5C__autoadjust__ageout__evict_aged_out_entries(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - hbool_t write_permitted, - hbool_t * first_flush_ptr); + hid_t dxpl_id, + hbool_t write_permitted); static herr_t H5C__autoadjust__ageout__insert_new_marker(H5C_t * cache_ptr); @@ -135,19 +140,16 @@ static herr_t H5C__flash_increase_cache_size(H5C_t * cache_ptr, size_t old_entry_size, size_t new_entry_size); -static herr_t H5C_flush_single_entry(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - const H5C_class_t * type_ptr, - haddr_t addr, - unsigned flags, - hbool_t * first_flush_ptr, - hbool_t del_entry_from_slist_on_destroy); +static herr_t H5C_flush_single_entry(const H5F_t * f, + hid_t dxpl_id, + haddr_t addr, + unsigned flags, + hbool_t del_entry_from_slist_on_destroy, + int64_t *entry_size_change_ptr); -static herr_t H5C_flush_invalidate_cache(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - unsigned flags); +static herr_t H5C_flush_invalidate_cache(const H5F_t * f, + hid_t dxpl_id, + unsigned flags); static void * H5C_load_entry(H5F_t * f, hid_t dxpl_id, @@ -156,19 +158,16 @@ static void * H5C_load_entry(H5F_t * f, void * udata); static herr_t H5C_make_space_in_cache(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - size_t space_needed, - hbool_t write_permitted, - hbool_t * first_flush_ptr); + hid_t dxpl_id, + size_t space_needed, + hbool_t write_permitted); static herr_t H5C_tag_entry(H5C_t * cache_ptr, H5C_cache_entry_t * entry_ptr, hid_t dxpl_id); static herr_t H5C_flush_tagged_entries(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, + hid_t dxpl_id, H5C_t * cache_ptr, haddr_t tag); @@ -176,20 +175,29 @@ static herr_t H5C_mark_tagged_entries(H5C_t * cache_ptr, haddr_t tag); static herr_t H5C_flush_marked_entries(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, + hid_t dxpl_id, H5C_t * cache_ptr); #if H5C_DO_TAGGING_SANITY_CHECKS static herr_t H5C_verify_tag(int id, haddr_t tag); #endif +#if H5C_DO_SLIST_SANITY_CHECKS +static hbool_t H5C_entry_in_skip_list(H5C_t * cache_ptr, + H5C_cache_entry_t *target_ptr); +#endif /* H5C_DO_SLIST_SANITY_CHECKS */ + #if H5C_DO_EXTREME_SANITY_CHECKS static herr_t H5C_validate_lru_list(H5C_t * cache_ptr); static herr_t H5C_validate_pinned_entry_list(H5C_t * cache_ptr); static herr_t H5C_validate_protected_entry_list(H5C_t * cache_ptr); #endif /* H5C_DO_EXTREME_SANITY_CHECKS */ +#if 0 /* debugging routines */ +herr_t H5C_dump_cache(H5C_t * cache_ptr, const char * cache_name); +herr_t H5C_dump_cache_skip_list(H5C_t * cache_ptr, char * calling_fcn); +#endif /* debugging routines */ + /**************************************************************************** * @@ -208,25 +216,53 @@ static herr_t H5C_validate_protected_entry_list(H5C_t * cache_ptr); #define H5C__EPOCH_MARKER_TYPE H5C__MAX_NUM_TYPE_IDS -static void *H5C_epoch_marker_load(H5F_t *f, hid_t dxpl_id, haddr_t addr, - void *udata); -static herr_t H5C_epoch_marker_flush(H5F_t *f, hid_t dxpl_id, hbool_t dest, - haddr_t addr, void *thing, - unsigned *flags_ptr); -static herr_t H5C_epoch_marker_dest(H5F_t *f, void *thing); -static herr_t H5C_epoch_marker_clear(H5F_t *f, void *thing, hbool_t dest); -static herr_t H5C_epoch_marker_notify(H5C_notify_action_t action, void *thing); -static herr_t H5C_epoch_marker_size(const H5F_t *f, const void *thing, size_t *size_ptr); +static herr_t H5C__epoch_marker_get_load_size(const void *udata_ptr, + size_t *image_len_ptr); +static void * H5C__epoch_marker_deserialize(const void * image_ptr, + size_t len, + void * udata, + hbool_t * dirty_ptr); +static herr_t H5C__epoch_marker_image_len(const void * thing, + size_t *image_len_ptr, + hbool_t *compressed_ptr, + size_t *compressed_len_ptr); +static herr_t H5C__epoch_marker_pre_serialize(const H5F_t *f, + hid_t dxpl_id, + void * thing, + haddr_t addr, + size_t len, + size_t compressed_len, + haddr_t * new_addr_ptr, + size_t * new_len_ptr, + size_t * new_compressed_len_ptr, + unsigned * flags_ptr); +static herr_t H5C__epoch_marker_serialize(const H5F_t *f, + void * image_ptr, + size_t len, + void * thing); +static herr_t H5C__epoch_marker_notify(H5C_notify_action_t action, void *thing); +static herr_t H5C__epoch_marker_free_icr(void * thing); + +static herr_t H5C__epoch_marker_clear(const H5F_t *f, void * thing, + hbool_t about_to_destroy); +static herr_t H5C__epoch_marker_fsf_size(const void H5_ATTR_UNUSED * thing, + size_t H5_ATTR_UNUSED * fsf_size_ptr); const H5C_class_t epoch_marker_class = { - /* id = */ H5C__EPOCH_MARKER_TYPE, - /* load = */ &H5C_epoch_marker_load, - /* flush = */ &H5C_epoch_marker_flush, - /* dest = */ &H5C_epoch_marker_dest, - /* clear = */ &H5C_epoch_marker_clear, - /* notify = */&H5C_epoch_marker_notify, - /* size = */ &H5C_epoch_marker_size + /* id = */ H5C__EPOCH_MARKER_TYPE, + /* name = */ "epoch marker", + /* mem_type = */ H5FD_MEM_DEFAULT, /* value doesn't matter */ + /* flags = */ H5AC__CLASS_NO_FLAGS_SET, + /* get_load_size = */ H5C__epoch_marker_get_load_size, + /* deserialize = */ H5C__epoch_marker_deserialize, + /* image_len = */ H5C__epoch_marker_image_len, + /* pre_serialize = */ H5C__epoch_marker_pre_serialize, + /* serialize = */ H5C__epoch_marker_serialize, + /* notify = */ H5C__epoch_marker_notify, + /* free_icr = */ H5C__epoch_marker_free_icr, + /* clear = */ H5C__epoch_marker_clear, + /* fsf_size = */ H5C__epoch_marker_fsf_size, }; @@ -239,107 +275,114 @@ const H5C_class_t epoch_marker_class = * JRM - 11/16/04 * ***************************************************************************/ - -static void * -H5C_epoch_marker_load(H5F_t H5_ATTR_UNUSED * f, - hid_t H5_ATTR_UNUSED dxpl_id, - haddr_t H5_ATTR_UNUSED addr, - void H5_ATTR_UNUSED * udata) +static herr_t +H5C__epoch_marker_get_load_size(const void H5_ATTR_UNUSED *udata_ptr, + size_t H5_ATTR_UNUSED *image_len_ptr) { - void * ret_value = NULL; /* Return value */ + FUNC_ENTER_STATIC_NOERR /* Yes, even though this pushes an error on the stack */ - FUNC_ENTER_NOAPI_NOINIT + HERROR(H5E_CACHE, H5E_SYSTEM, "called unreachable fcn."); - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, NULL, "called unreachable fcn.") + FUNC_LEAVE_NOAPI(FAIL) +} /* end H5C__epoch_marker_get_load_size() */ -done: + +static void * +H5C__epoch_marker_deserialize(const void H5_ATTR_UNUSED * image_ptr, size_t H5_ATTR_UNUSED len, + void H5_ATTR_UNUSED * udata, hbool_t H5_ATTR_UNUSED * dirty_ptr) +{ + FUNC_ENTER_STATIC_NOERR /* Yes, even though this pushes an error on the stack */ - FUNC_LEAVE_NOAPI(ret_value) -} + HERROR(H5E_CACHE, H5E_SYSTEM, "called unreachable fcn."); + FUNC_LEAVE_NOAPI(NULL) +} /* end H5C__epoch_marker_deserialize() */ static herr_t -H5C_epoch_marker_flush(H5F_t H5_ATTR_UNUSED *f, - hid_t H5_ATTR_UNUSED dxpl_id, - hbool_t H5_ATTR_UNUSED dest, - haddr_t H5_ATTR_UNUSED addr, - void H5_ATTR_UNUSED *thing, - unsigned H5_ATTR_UNUSED * flags_ptr) +H5C__epoch_marker_image_len(const void H5_ATTR_UNUSED *thing, + size_t H5_ATTR_UNUSED *image_len_ptr, hbool_t H5_ATTR_UNUSED *compressed_ptr, + size_t H5_ATTR_UNUSED *compressed_len_ptr) { - herr_t ret_value = FAIL; /* Return value */ + FUNC_ENTER_STATIC_NOERR /* Yes, even though this pushes an error on the stack */ - FUNC_ENTER_NOAPI_NOINIT + HERROR(H5E_CACHE, H5E_SYSTEM, "called unreachable fcn."); - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "called unreachable fcn.") + FUNC_LEAVE_NOAPI(FAIL) +} /* end H5C__epoch_marker_image_len() */ -done: + +static herr_t +H5C__epoch_marker_pre_serialize(const H5F_t H5_ATTR_UNUSED *f, hid_t H5_ATTR_UNUSED dxpl_id, + void H5_ATTR_UNUSED *thing, haddr_t H5_ATTR_UNUSED addr, size_t H5_ATTR_UNUSED len, + size_t H5_ATTR_UNUSED compressed_len, haddr_t H5_ATTR_UNUSED *new_addr_ptr, + size_t H5_ATTR_UNUSED *new_len_ptr, size_t H5_ATTR_UNUSED *new_compressed_len_ptr, + unsigned H5_ATTR_UNUSED *flags_ptr) +{ + FUNC_ENTER_STATIC_NOERR /* Yes, even though this pushes an error on the stack */ - FUNC_LEAVE_NOAPI(ret_value) -} + HERROR(H5E_CACHE, H5E_SYSTEM, "called unreachable fcn."); + FUNC_LEAVE_NOAPI(FAIL) +} /* end H5C__epoch_marker_pre_serialize() */ static herr_t -H5C_epoch_marker_dest(H5F_t H5_ATTR_UNUSED * f, - void H5_ATTR_UNUSED * thing) +H5C__epoch_marker_serialize(const H5F_t H5_ATTR_UNUSED *f, void H5_ATTR_UNUSED *image_ptr, + size_t H5_ATTR_UNUSED len, void H5_ATTR_UNUSED *thing) { - herr_t ret_value = FAIL; /* Return value */ - - FUNC_ENTER_NOAPI_NOINIT + FUNC_ENTER_STATIC_NOERR /* Yes, even though this pushes an error on the stack */ - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "called unreachable fcn.") + HERROR(H5E_CACHE, H5E_SYSTEM, "called unreachable fcn."); -done: - - FUNC_LEAVE_NOAPI(ret_value) -} + FUNC_LEAVE_NOAPI(FAIL) +} /* end H5C__epoch_marker_serialize() */ + static herr_t -H5C_epoch_marker_clear(H5F_t H5_ATTR_UNUSED * f, - void H5_ATTR_UNUSED * thing, - hbool_t H5_ATTR_UNUSED dest) +H5C__epoch_marker_notify(H5C_notify_action_t H5_ATTR_UNUSED action, + void H5_ATTR_UNUSED * thing) { - herr_t ret_value = FAIL; /* Return value */ - - FUNC_ENTER_NOAPI_NOINIT + FUNC_ENTER_STATIC_NOERR /* Yes, even though this pushes an error on the stack */ - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "called unreachable fcn.") + HERROR(H5E_CACHE, H5E_SYSTEM, "called unreachable fcn."); -done: - - FUNC_LEAVE_NOAPI(ret_value) -} + FUNC_LEAVE_NOAPI(FAIL) +} /* end H5C__epoch_marker_notify() */ + static herr_t -H5C_epoch_marker_notify(H5C_notify_action_t H5_ATTR_UNUSED action, - void H5_ATTR_UNUSED * thing) +H5C__epoch_marker_free_icr(void H5_ATTR_UNUSED * thing) { - herr_t ret_value = FAIL; /* Return value */ + FUNC_ENTER_STATIC_NOERR /* Yes, even though this pushes an error on the stack */ - FUNC_ENTER_NOAPI_NOINIT + HERROR(H5E_CACHE, H5E_SYSTEM, "called unreachable fcn."); - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "called unreachable fcn.") + FUNC_LEAVE_NOAPI(FAIL) +} /* end H5C__epoch_marker_free_icr() */ -done: - FUNC_LEAVE_NOAPI(ret_value) -} - -static herr_t -H5C_epoch_marker_size(const H5F_t H5_ATTR_UNUSED * f, - const void H5_ATTR_UNUSED * thing, - size_t H5_ATTR_UNUSED * size_ptr) + +static herr_t +H5C__epoch_marker_clear(const H5F_t H5_ATTR_UNUSED *f, void H5_ATTR_UNUSED * thing, hbool_t H5_ATTR_UNUSED about_to_destroy) { - herr_t ret_value = FAIL; /* Return value */ + FUNC_ENTER_STATIC_NOERR /* Yes, even though this pushes an error on the stack */ - FUNC_ENTER_NOAPI_NOINIT + HERROR(H5E_CACHE, H5E_SYSTEM, "called unreachable fcn."); - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "called unreachable fcn.") + FUNC_LEAVE_NOAPI(FAIL) +} /* end H5C__epoch_marker_clear() */ -done: + +static herr_t +H5C__epoch_marker_fsf_size(const void H5_ATTR_UNUSED * thing, size_t H5_ATTR_UNUSED *fsf_size_ptr) +{ + FUNC_ENTER_STATIC_NOERR /* Yes, even though this pushes an error on the stack */ + + HERROR(H5E_CACHE, H5E_SYSTEM, "called unreachable fcn."); + + FUNC_LEAVE_NOAPI(FAIL) +} /* end H5C__epoch_marker_fsf_size() */ - FUNC_LEAVE_NOAPI(ret_value) -} /*------------------------------------------------------------------------- @@ -423,21 +466,46 @@ done: * Programmer: John Mainzer * 3/17/10 * + * Changes: Ported code to detect next entry status changes as the + * the result of a flush from the serial code in the scan of + * the LRU. Also added code to detect and adapt to the + * removal from the cache of the next entry in the scan of + * the LRU. + * + * Note that at present, all of these changes should not + * be required as the operations on entries as they are + * flushed that can cause these condiditions are not premitted + * in the parallel case. However, Quincey indicates that + * this may change, and thus has requested the modification. + * + * Note the assert(FALSE) in the if statement whose body + * restarts the scan of the LRU. As the body of the if + * statement should be unreachable, it should never be + * triggered until the constraints on the parallel case + * are relaxed. Please remove the assertion at that time. + * + * Also added warning on the Pinned Entry List scan, as it + * is potentially subject to the same issue. As there is + * no cognate of this scan in the serial code, I don't have + * a fix to port to it. + * + * JRM -- 4/10/19 + * *------------------------------------------------------------------------- */ #ifdef H5_HAVE_PARALLEL #define H5C_APPLY_CANDIDATE_LIST__DEBUG 0 herr_t H5C_apply_candidate_list(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, + hid_t dxpl_id, H5C_t * cache_ptr, int num_candidates, haddr_t * candidates_list_ptr, int mpi_rank, int mpi_size) { - hbool_t first_flush = FALSE; + hbool_t restart_scan; + hbool_t prev_is_dirty; int i; int m; int n; @@ -457,6 +525,7 @@ H5C_apply_candidate_list(H5F_t * f, int * candidate_assignment_table = NULL; haddr_t addr; H5C_cache_entry_t * clear_ptr = NULL; + H5C_cache_entry_t * next_ptr = NULL; H5C_cache_entry_t * entry_ptr = NULL; H5C_cache_entry_t * flush_ptr = NULL; H5C_cache_entry_t * delayed_ptr = NULL; @@ -634,16 +703,29 @@ H5C_apply_candidate_list(H5F_t * f, * should be reworked to account for additional cases. * ===================================================================== */ + HDassert(entries_to_flush >= 0); + + restart_scan = FALSE; entries_examined = 0; initial_list_len = cache_ptr->LRU_list_len; entry_ptr = cache_ptr->LRU_tail_ptr; /* Examine each entry in the LRU list */ - while((entry_ptr != NULL) && (entries_examined <= initial_list_len) && - ((entries_cleared + entries_flushed) < num_candidates)) { + while ( ( entry_ptr != NULL ) + && + ( entries_examined <= (entries_to_flush + 1) * initial_list_len ) + && + ( (entries_cleared + entries_flushed) < num_candidates ) ) { + + if ( entry_ptr->prev != NULL ) + prev_is_dirty = entry_ptr->prev->is_dirty; /* If this process needs to clear this entry. */ if(entry_ptr->clear_on_unprotect) { + + HDassert(entry_ptr->is_dirty); + + next_ptr = entry_ptr->next; entry_ptr->clear_on_unprotect = FALSE; clear_ptr = entry_ptr; entry_ptr = entry_ptr->prev; @@ -654,20 +736,26 @@ H5C_apply_candidate_list(H5F_t * f, (long long)clear_ptr->addr); #endif /* H5C_APPLY_CANDIDATE_LIST__DEBUG */ + /* No need to check for the next entry in the scan being + * removed from the cache, as this call to H5C_flush_single_entry() + * will not call either the pre_serialize or serialize callbacks. + */ + if(H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - clear_ptr->type, + dxpl_id, clear_ptr->addr, H5C__FLUSH_CLEAR_ONLY_FLAG, - &first_flush, - TRUE) < 0) + TRUE, + NULL) < 0) HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't clear entry.") } /* end if */ /* Else, if this process needs to flush this entry. */ else if (entry_ptr->flush_immediately) { + HDassert(entry_ptr->is_dirty); + + next_ptr = entry_ptr->next; entry_ptr->flush_immediately = FALSE; flush_ptr = entry_ptr; entry_ptr = entry_ptr->prev; @@ -678,22 +766,94 @@ H5C_apply_candidate_list(H5F_t * f, (long long)flush_ptr->addr); #endif /* H5C_APPLY_CANDIDATE_LIST__DEBUG */ + /* reset entries_removed_counter and + * last_entry_removed_ptr prior to the call to + * H5C_flush_single_entry() so that we can spot + * unexpected removals of entries from the cache, + * and set the restart_scan flag if proceeding + * would be likely to cause us to scan an entry + * that is no longer in the cache. + * + * Note that as of this writing (April 2015) this + * case cannot occur in the parallel case. However + * Quincey is making noises about changing this, hence + * the insertion of this test. + * + * Note also that there is no test code to verify + * that this code actually works (although similar code + * in the serial version exists and is tested). + * + * Implementing a test will likely require implementing + * flush op like facilities in the parallel tests. At + * a guess this will not be terribly painful, but it + * will take a bit of time. + */ + cache_ptr->entries_removed_counter = 0; + cache_ptr->last_entry_removed_ptr = NULL; + if(H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - flush_ptr->type, + dxpl_id, flush_ptr->addr, H5C__NO_FLAGS_SET, - &first_flush, - TRUE) < 0) + TRUE, + NULL) < 0) HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't flush entry.") + + if ( ( cache_ptr->entries_removed_counter > 1 ) || + ( cache_ptr->last_entry_removed_ptr == entry_ptr ) ) + + restart_scan = TRUE; + } /* end else-if */ /* Otherwise, no action to be taken on this entry. Grab the next. */ else { entry_ptr = entry_ptr->prev; + + if ( entry_ptr != NULL ) + next_ptr = entry_ptr->next; + } /* end else */ + if ( ( entry_ptr != NULL ) + && + ( ( restart_scan ) + || + ( entry_ptr->is_dirty != prev_is_dirty ) + || + ( entry_ptr->next != next_ptr ) + || + ( entry_ptr->is_protected ) + || + ( entry_ptr->is_pinned ) + ) + ) { + + /* something has happened to the LRU -- start over + * from the tail. + * + * Recall that this code should be un-reachable at present, + * as all the operations by entries on flush that could cause + * it to be reachable are disallowed in the parallel case at + * present. Hence the following assertion which should be + * removed if the above changes. + */ + + HDassert( ! restart_scan ); + HDassert( entry_ptr->is_dirty == prev_is_dirty ); + HDassert( entry_ptr->next == next_ptr ); + HDassert( ! entry_ptr->is_protected ); + HDassert( ! entry_ptr->is_pinned ); + + HDassert(FALSE); /* see comment above */ + + restart_scan = FALSE; + entry_ptr = cache_ptr->LRU_tail_ptr; +/* + H5C__UPDATE_STATS_FOR_LRU_SCAN_RESTART(cache_ptr) +*/ + } + entries_examined++; } /* end while */ @@ -705,6 +865,30 @@ H5C_apply_candidate_list(H5F_t * f, /* It is also possible that some of the cleared entries are on the * pinned list. Must scan that also. + * + * WARNING: + * + * As we now allow unpinning, and removal of other entries as a side + * effect of flushing an entry, it is possible that the next entry + * in a PEL scan could either be no longer pinned, or no longer in + * the cache by the time we get to it. + * + * At present, this is not possible in this case, as we disallow such + * operations in the parallel version of the library. However, Quincey + * has been making noises about relaxing this. If and when he does, + * we have a potential problem here. + * + * The same issue exists in the serial cache, and there are tests + * to detect this problem when it occurs, and adjust to it. As seen + * above in the LRU scan, I have ported such tests to the parallel + * code where a close cognate exists in the serial code. + * + * I haven't done so here, as there are no PEL scans where the problem + * can occur in the serial code. Needless to say, this will have to + * be repaired if the constraints on pre_serialize and serialize + * callbacks are relaxed in the parallel version of the metadata cache. + * + * JRM -- 4/1/15 */ #if H5C_APPLY_CANDIDATE_LIST__DEBUG @@ -772,14 +956,12 @@ H5C_apply_candidate_list(H5F_t * f, #endif /* H5C_APPLY_CANDIDATE_LIST__DEBUG */ if(H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - clear_ptr->type, - clear_ptr->addr, - H5C__FLUSH_CLEAR_ONLY_FLAG, - &first_flush, - TRUE) < 0) - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't clear entry.") + dxpl_id, + clear_ptr->addr, + H5C__FLUSH_CLEAR_ONLY_FLAG, + TRUE, + NULL) < 0) + HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't clear entry.") } /* end else-if */ /* Else, if this process needs to independently flush this entry. */ @@ -795,14 +977,12 @@ H5C_apply_candidate_list(H5F_t * f, #endif /* H5C_APPLY_CANDIDATE_LIST__DEBUG */ if(H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - flush_ptr->type, - flush_ptr->addr, - H5C__NO_FLAGS_SET, - &first_flush, - TRUE) < 0) - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't flush entry.") + dxpl_id, + flush_ptr->addr, + H5C__NO_FLAGS_SET, + TRUE, + NULL) < 0) + HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't clear entry.") } /* end else-if */ } /* end if */ @@ -843,13 +1023,11 @@ H5C_apply_candidate_list(H5F_t * f, } /* end if */ if(H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - delayed_ptr->type, + dxpl_id, delayed_ptr->addr, H5C__NO_FLAGS_SET, - &first_flush, - TRUE) < 0) + TRUE, + NULL) < 0) HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't flush entry collectively.") @@ -1184,6 +1362,9 @@ H5C_create(size_t max_cache_size, /* Tagging Field Initializations */ cache_ptr->ignore_tags = FALSE; + cache_ptr->slist_changed = FALSE; + cache_ptr->slist_change_in_pre_serialize = FALSE; + cache_ptr->slist_change_in_serialize = FALSE; cache_ptr->slist_len = 0; cache_ptr->slist_size = (size_t)0; @@ -1197,6 +1378,9 @@ H5C_create(size_t max_cache_size, (cache_ptr->index)[i] = NULL; } + cache_ptr->entries_removed_counter = 0; + cache_ptr->last_entry_removed_ptr = NULL; + cache_ptr->pl_len = 0; cache_ptr->pl_size = (size_t)0; cache_ptr->pl_head_ptr = NULL; @@ -1271,11 +1455,8 @@ H5C_create(size_t max_cache_size, /* Set non-zero/FALSE/NULL fields for epoch markers */ for ( i = 0; i < H5C__MAX_EPOCH_MARKERS; i++ ) { - (cache_ptr->epoch_marker_active)[i] = FALSE; -#ifndef NDEBUG ((cache_ptr->epoch_markers)[i]).magic = H5C__H5C_CACHE_ENTRY_T_MAGIC; -#endif /* NDEBUG */ ((cache_ptr->epoch_markers)[i]).addr = (haddr_t)i; ((cache_ptr->epoch_markers)[i]).type = &epoch_marker_class; } @@ -1530,9 +1711,7 @@ H5C_def_auto_resize_rpt_fcn(H5C_t * cache_ptr, *------------------------------------------------------------------------- */ herr_t -H5C_dest(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id) +H5C_dest(H5F_t * f, hid_t dxpl_id) { H5C_t * cache_ptr = f->shared->cache; herr_t ret_value = SUCCEED; /* Return value */ @@ -1544,8 +1723,7 @@ H5C_dest(H5F_t * f, HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC); /* Flush and invalidate all cache entries */ - if(H5C_flush_invalidate_cache(f, primary_dxpl_id, secondary_dxpl_id, - H5C__NO_FLAGS_SET) < 0 ) + if(H5C_flush_invalidate_cache(f, dxpl_id, H5C__NO_FLAGS_SET) < 0 ) HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush cache") if(cache_ptr->slist_ptr != NULL) { @@ -1570,7 +1748,9 @@ H5C_dest(H5F_t * f, #endif /* H5C_DO_SANITY_CHECKS */ #endif /* NDEBUG */ +#ifndef NDEBUG cache_ptr->magic = 0; +#endif /* NDEBUG */ cache_ptr = H5FL_FREE(H5C_t, cache_ptr); @@ -1595,17 +1775,16 @@ done: *------------------------------------------------------------------------- */ herr_t -H5C_expunge_entry(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - const H5C_class_t * type, - haddr_t addr, - unsigned flags) +H5C_expunge_entry(H5F_t *f, hid_t dxpl_id, const H5C_class_t *type, + haddr_t addr, unsigned flags) { H5C_t * cache_ptr; - herr_t result; - hbool_t first_flush = TRUE; H5C_cache_entry_t * entry_ptr = NULL; + unsigned flush_flags = (H5C__FLUSH_INVALIDATE_FLAG | H5C__FLUSH_CLEAR_ONLY_FLAG); +#if H5C_DO_SANITY_CHECKS + hbool_t entry_was_dirty; + hsize_t entry_size; +#endif /* H5C_DO_SANITY_CHECKS */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_NOAPI(FAIL) @@ -1616,8 +1795,6 @@ H5C_expunge_entry(H5F_t * f, HDassert(cache_ptr); HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC); HDassert(type); - HDassert(type->clear); - HDassert(type->dest); HDassert(H5F_addr_defined(addr)); #if H5C_DO_EXTREME_SANITY_CHECKS @@ -1641,27 +1818,34 @@ H5C_expunge_entry(H5F_t * f, if(entry_ptr->is_pinned) HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, "Target entry is pinned.") - /* Pass along 'free file space' flag to cache client */ - entry_ptr->free_file_space_on_destroy = ( (flags & H5C__FREE_FILE_SPACE_FLAG) != 0 ); - /* If we get this far, call H5C_flush_single_entry() with the * H5C__FLUSH_INVALIDATE_FLAG and the H5C__FLUSH_CLEAR_ONLY_FLAG. * This will clear the entry, and then delete it from the cache. */ - result = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - entry_ptr->type, - entry_ptr->addr, - H5C__FLUSH_INVALIDATE_FLAG | H5C__FLUSH_CLEAR_ONLY_FLAG, - &first_flush, - TRUE); - if ( result < 0 ) { + /* Pass along 'free file space' flag to cache client. */ + flush_flags |= (flags & H5C__FREE_FILE_SPACE_FLAG); - HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, \ - "H5C_flush_single_entry() failed.") +#if H5C_DO_SANITY_CHECKS + entry_was_dirty = entry_ptr->is_dirty; + entry_size = entry_ptr->size; +#endif /* H5C_DO_EXTREME_SANITY_CHECKS */ + + if(H5C_flush_single_entry(f, dxpl_id, entry_ptr->addr, flush_flags, TRUE, NULL) < 0) + HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, "H5C_flush_single_entry() failed.") + +#if H5C_DO_SANITY_CHECKS + if ( entry_was_dirty ) + { + /* we have just removed an entry from the skip list. Thus + * we must touch up cache_ptr->slist_len_increase and + * cache_ptr->slist_size_increase to keep from skewing + * the sanity checks on flushes. + */ + cache_ptr->slist_len_increase -= 1; + cache_ptr->slist_size_increase -= (int64_t)(entry_size); } +#endif /* H5C_DO_SANITY_CHECKS */ done: #if H5C_DO_EXTREME_SANITY_CHECKS @@ -1698,10 +1882,24 @@ done: * Programmer: John Mainzer * 6/2/04 * + * Changes: Modified function to test for slist chamges in + * pre_serialize and serialize callbacks, and re-start + * scans through the slist when such changes occur. + * + * This has been a potential problem for some time, + * and there has been code in this function to deal + * with elements of this issue. However the shift + * to the V3 cache in combination with the activities + * of some of the cache clients (in particular the + * free space manager and the fractal heap) have + * made this re-work necessary. + * + * JRM -- 12/13/14 + * *------------------------------------------------------------------------- */ herr_t -H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsigned flags) +H5C_flush_cache(H5F_t *f, hid_t dxpl_id, unsigned flags) { H5C_t * cache_ptr = f->shared->cache; herr_t status; @@ -1709,9 +1907,9 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign hbool_t destroy; hbool_t flushed_entries_last_pass; hbool_t flush_marked_entries; - hbool_t first_flush = TRUE; hbool_t ignore_protected; hbool_t tried_to_flush_protected_entry = FALSE; + hbool_t restart_slist_scan; int32_t passes = 0; int32_t protected_entries = 0; H5SL_node_t * node_ptr = NULL; @@ -1722,6 +1920,10 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign int64_t flushed_entries_size = 0; int64_t initial_slist_len = 0; size_t initial_slist_size = 0; + int64_t entry_size_change; + int64_t * entry_size_change_ptr = &entry_size_change; +#else /* H5C_DO_SANITY_CHECKS */ + int64_t * entry_size_change_ptr = NULL; #endif /* H5C_DO_SANITY_CHECKS */ FUNC_ENTER_NOAPI(FAIL) @@ -1758,10 +1960,7 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign if ( destroy ) { - status = H5C_flush_invalidate_cache(f, - primary_dxpl_id, - secondary_dxpl_id, - flags); + status = H5C_flush_invalidate_cache(f, dxpl_id, flags); if ( status < 0 ) { @@ -1780,6 +1979,18 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign flushed_entries_last_pass = TRUE; + /* set the cache_ptr->slist_change_in_pre_serialize and + * cache_ptr->slist_change_in_serialize to false. + * + * These flags are set to TRUE by H5C_flush_single_entry if the + * slist is modified by a pre_serialize or serialize call respectively. + * H5C_flush_cache uses these flags to detect any modifications + * to the slist that might corrupt the scan of the slist -- and + * restart the scan in this event. + */ + cache_ptr->slist_change_in_pre_serialize = FALSE; + cache_ptr->slist_change_in_serialize = FALSE; + while ( ( passes < H5C__MAX_PASSES_ON_FLUSH ) && ( cache_ptr->slist_len != 0 ) && ( protected_entries == 0 ) && @@ -1797,18 +2008,6 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign { hbool_t flushed_during_dep_loop = FALSE; - /* Start at beginning of skip list each time */ - node_ptr = H5SL_first(cache_ptr->slist_ptr); - HDassert( node_ptr != NULL ); - - /* Get cache entry for this node */ - next_entry_ptr = (H5C_cache_entry_t *)H5SL_item(node_ptr); - if ( NULL == next_entry_ptr ) - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "next_entry_ptr == NULL ?!?!") - HDassert( next_entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC ); - HDassert( next_entry_ptr->is_dirty ); - HDassert( next_entry_ptr->in_slist ); - #if H5C_DO_SANITY_CHECKS /* For sanity checking, try to verify that the skip list has * the expected size and number of entries at the end of each @@ -1818,8 +2017,10 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign * or may not flush all the entries in the slist. * * To make things more entertaining, with the advent of the - * fractal heap, the entry flush callback can cause entries - * to be dirtied, resized, and/or moved. + * fractal heap, the entry serialize callback can cause entries + * to be dirtied, resized, and/or moved. Also, the + * pre_serialize callback can result in an entry being + * removed from the cache via the take ownership flag. * * To deal with this, we first make note of the initial * skip list length and size: @@ -1834,7 +2035,8 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign flushed_entries_size = 0; /* As mentioned above, there is the possibility that - * entries will be dirtied, resized, and/or flushed during + * entries will be dirtied, resized, flushed, or removed + * from the cache via the take ownership flag during * our pass through the skip list. To capture the number * of entries added, and the skip list size delta, * zero the slist_len_increase and slist_size_increase of @@ -1851,53 +2053,60 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign */ #endif /* H5C_DO_SANITY_CHECKS */ - while ( node_ptr != NULL ) + restart_slist_scan = TRUE; + + while ( ( restart_slist_scan ) || ( node_ptr != NULL ) ) { - entry_ptr = next_entry_ptr; + if ( restart_slist_scan ) + { + restart_slist_scan = FALSE; - /* With the advent of the fractal heap, it is possible - * that the flush callback will dirty and/or resize - * other entries in the cache. In particular, while - * Quincey has promised me that this will never happen, - * it is possible that the flush callback for an - * entry may protect an entry that is not in the cache, - * perhaps causing the cache to flush and possibly - * evict the entry associated with node_ptr to make - * space for the new entry. - * - * Thus we do a bit of extra sanity checking on entry_ptr, - * and break out of this scan of the skip list if we - * detect minor problems. We have a bit of leaway on the - * number of passes though the skip list, so this shouldn't - * be an issue in the flush in and of itself, as it should - * be all but impossible for this to happen more than once - * in any flush. - * - * Observe that that breaking out of the scan early - * shouldn't break the sanity checks just after the end - * of this while loop. - * - * If an entry has merely been marked clean and removed from - * the s-list, we simply break out of the scan. - * - * If the entry has been evicted, we flag an error and - * exit. - */ -#ifndef NDEBUG - if ( entry_ptr->magic != H5C__H5C_CACHE_ENTRY_T_MAGIC ) { + /* Start at beginning of skip list */ + node_ptr = H5SL_first(cache_ptr->slist_ptr); - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "entry_ptr->magic is invalid ?!?!") + if ( node_ptr == NULL ) + { + /* the slist is empty -- break out of inner loop */ + break; + } + HDassert( node_ptr != NULL ); - } else -#endif /* NDEBUG */ - if ( ( ! entry_ptr->is_dirty ) || - ( ! entry_ptr->in_slist ) ) { + /* Get cache entry for this node */ + next_entry_ptr = + (H5C_cache_entry_t *)H5SL_item(node_ptr); - /* the s-list has been modified out from under us. - * break out of the loop. - */ - goto end_of_inner_loop;; + if(NULL == next_entry_ptr) + HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \ + "next_entry_ptr == NULL ?!?!") + + HDassert( next_entry_ptr->magic == \ + H5C__H5C_CACHE_ENTRY_T_MAGIC ); + HDassert( next_entry_ptr->is_dirty ); + HDassert( next_entry_ptr->in_slist ); } + + entry_ptr = next_entry_ptr; + + /* With the advent of the fractal heap, the free space + * manager, and the version 3 cache, it is possible + * that the pre-serialize or serialize callback will + * dirty, resize, or take ownership of other entries + * in the cache. + * + * To deal with this, I have inserted code to detect any + * change in the skip list not directly under the control + * of this function. If such modifications are detected, + * we must re-start the scan of the skip list to avoid + * the possibility that the target of the next_entry_ptr + * may have been flushed or deleted from the cache. + * + * To verify that all such possibilities have been dealt + * with, we do a bit of extra sanity checking on + * entry_ptr. + */ + HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC); + HDassert(entry_ptr->in_slist); + HDassert(entry_ptr->is_dirty); /* increment node pointer now, before we delete its target * from the slist. @@ -1911,6 +2120,7 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign HDassert( next_entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC ); HDassert( next_entry_ptr->is_dirty ); HDassert( next_entry_ptr->in_slist ); + HDassert( entry_ptr != next_entry_ptr ); } else { next_entry_ptr = NULL; } @@ -1927,9 +2137,9 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign if ( entry_ptr->is_protected ) { - /* we probably have major problems -- but lets flush - * everything we can before we decide whether to flag - * an error. + /* we probably have major problems -- but lets + * flush everything we can before we decide + * whether to flag an error. */ tried_to_flush_protected_entry = TRUE; protected_entries++; @@ -1944,15 +2154,14 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign #if H5C_DO_SANITY_CHECKS flushed_entries_count++; flushed_entries_size += (int64_t)entry_ptr->size; + entry_size_change = 0; #endif /* H5C_DO_SANITY_CHECKS */ status = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - NULL, - entry_ptr->addr, - flags, - &first_flush, - FALSE); + dxpl_id, + entry_ptr->addr, + flags, + FALSE, + entry_size_change_ptr); if ( status < 0 ) { /* This shouldn't happen -- if it does, @@ -1961,7 +2170,35 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ "dirty pinned entry flush failed.") } /* end if */ + +#if H5C_DO_SANITY_CHECKS + /* it is possible that the entry size changed + * during flush -- update flushed_entries_size + * to account for this. + */ + flushed_entries_size += entry_size_change; +#endif /* H5C_DO_SANITY_CHECKS */ + flushed_during_dep_loop = TRUE; + + if ((cache_ptr->slist_change_in_serialize) || + (cache_ptr->slist_change_in_pre_serialize)) + { + /* The slist has been modified by something + * other than the simple removal of the + * of the flushed entry after the flush. + * + * This has the potential to corrupt the + * scan through the slist, so restart it. + */ + restart_slist_scan = TRUE; + cache_ptr->slist_change_in_pre_serialize + = FALSE; + cache_ptr->slist_change_in_serialize + = FALSE; + + H5C__UPDATE_STATS_FOR_SLIST_SCAN_RESTART(cache_ptr) + } } /* end if */ else if(entry_ptr->flush_dep_height < curr_flush_dep_height) /* This shouldn't happen -- if it does, just scream and die. */ @@ -1977,15 +2214,14 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign #if H5C_DO_SANITY_CHECKS flushed_entries_count++; flushed_entries_size += (int64_t)entry_ptr->size; + entry_size_change = 0; #endif /* H5C_DO_SANITY_CHECKS */ status = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - NULL, - entry_ptr->addr, - flags, - &first_flush, - FALSE); + dxpl_id, + entry_ptr->addr, + flags, + FALSE, + entry_size_change_ptr); if ( status < 0 ) { /* This shouldn't happen -- if it does, @@ -1994,14 +2230,42 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ "Can't flush entry.") } + +#if H5C_DO_SANITY_CHECKS + /* it is possible that the entry size changed + * during flush -- update flushed_entries_size + * to account for this. + */ + flushed_entries_size += entry_size_change; +#endif /* H5C_DO_SANITY_CHECKS */ + flushed_during_dep_loop = TRUE; + + if ((cache_ptr->slist_change_in_serialize) || + (cache_ptr->slist_change_in_pre_serialize)) + { + /* The slist has been modified by something + * other than the simple removal of the + * of the flushed entry after the flush. + * + * This has the potential to corrupt the + * scan through the slist, so restart it. + */ + restart_slist_scan = TRUE; + cache_ptr->slist_change_in_pre_serialize + = FALSE; + cache_ptr->slist_change_in_serialize + = FALSE; + + H5C__UPDATE_STATS_FOR_SLIST_SCAN_RESTART(cache_ptr) + } } /* end if */ else if(entry_ptr->flush_dep_height < curr_flush_dep_height) /* This shouldn't happen -- if it does, just scream and die. */ HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "dirty entry below current flush dep. height.") } /* end else */ } /* end if */ - } /* while ( node_ptr != NULL ) */ + } /* while ( ( restart_slist_scan ) || ( node_ptr != NULL ) ) */ /* Check for incrementing flush dependency height */ if(flushed_during_dep_loop) { @@ -2020,7 +2284,8 @@ H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsign curr_flush_dep_height++; } /* while ( curr_flush_dep_height <= H5C__NUM_FLUSH_DEP_HEIGHTS) */ -end_of_inner_loop: + + passes++; #if H5C_DO_SANITY_CHECKS /* Verify that the slist size and length are as expected. */ @@ -2032,8 +2297,6 @@ end_of_inner_loop: flushed_entries_size) == cache_ptr->slist_size ); #endif /* H5C_DO_SANITY_CHECKS */ - passes++; - } /* while */ HDassert( protected_entries <= cache_ptr->pl_len ); @@ -2098,12 +2361,10 @@ done: */ herr_t H5C_flush_to_min_clean(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id) + hid_t dxpl_id) { H5C_t * cache_ptr; herr_t result; - hbool_t first_flush = TRUE; hbool_t write_permitted; #if 0 /* modified code -- commented out for now */ int i; @@ -2146,11 +2407,9 @@ H5C_flush_to_min_clean(H5F_t * f, } #if 1 /* original code */ result = H5C_make_space_in_cache(f, - primary_dxpl_id, - secondary_dxpl_id, + dxpl_id, (size_t)0, - write_permitted, - &first_flush); + write_permitted); if ( result < 0 ) { @@ -2645,8 +2904,7 @@ H5C_get_trace_file_ptr_from_entry(const H5C_cache_entry_t *entry_ptr) */ herr_t H5C_insert_entry(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, + hid_t dxpl_id, const H5C_class_t * type, haddr_t addr, void * thing, @@ -2654,7 +2912,6 @@ H5C_insert_entry(H5F_t * f, { H5C_t * cache_ptr; herr_t result; - hbool_t first_flush = TRUE; hbool_t insert_pinned; hbool_t flush_last; #ifdef H5_HAVE_PARALLEL @@ -2678,8 +2935,6 @@ H5C_insert_entry(H5F_t * f, HDassert( cache_ptr ); HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC ); HDassert( type ); - HDassert( type->flush ); - HDassert( type->size ); HDassert( H5F_addr_defined(addr) ); HDassert( thing ); @@ -2718,15 +2973,16 @@ H5C_insert_entry(H5F_t * f, HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, "duplicate entry in cache.") } /* end if */ -#ifndef NDEBUG entry_ptr->magic = H5C__H5C_CACHE_ENTRY_T_MAGIC; -#endif /* NDEBUG */ entry_ptr->cache_ptr = cache_ptr; entry_ptr->addr = addr; entry_ptr->type = type; + entry_ptr->image_ptr = NULL; + entry_ptr->image_up_to_date = FALSE; + /* Apply tag to newly inserted entry */ - if(H5C_tag_entry(cache_ptr, entry_ptr, primary_dxpl_id) < 0) + if(H5C_tag_entry(cache_ptr, entry_ptr, dxpl_id) < 0) HGOTO_ERROR(H5E_CACHE, H5E_CANTTAG, FAIL, "Cannot tag metadata entry") entry_ptr->is_protected = FALSE; @@ -2747,10 +3003,27 @@ H5C_insert_entry(H5F_t * f, /* not protected, so can't be dirtied */ entry_ptr->dirtied = FALSE; - /* Retrieve the size of the thing */ - if((type->size)(f, thing, &(entry_ptr->size)) < 0) + /* Retrieve the size of the thing. Set the compressed field to FALSE + * and the compressed_size field to zero first, as they may not be + * initialized by the image_len call. + */ + entry_ptr->compressed = FALSE; + entry_ptr->compressed_size = 0; + if((type->image_len)(thing, &(entry_ptr->size), &(entry_ptr->compressed), + &(entry_ptr->compressed_size)) < 0) HGOTO_ERROR(H5E_RESOURCE, H5E_CANTGETSIZE, FAIL, "Can't get size of thing") HDassert(entry_ptr->size > 0 && entry_ptr->size < H5C_MAX_ENTRY_SIZE); + HDassert(((type->flags & H5C__CLASS_COMPRESSED_FLAG) != 0) || + (entry_ptr->compressed == FALSE)); + + /* entry has just been inserted -- thus compressed size cannot have + * been computed yet. Thus if entry_ptr->compressed is TRUE, + * entry_ptr->size must equal entry_ptr->compressed_size. + */ + HDassert((entry_ptr->compressed == FALSE) || + (entry_ptr->size == entry_ptr->compressed_size)); + HDassert((entry_ptr->compressed == TRUE) || + (entry_ptr->compressed_size == 0)); entry_ptr->in_slist = FALSE; @@ -2761,7 +3034,6 @@ H5C_insert_entry(H5F_t * f, entry_ptr->flush_in_progress = FALSE; entry_ptr->destroy_in_progress = FALSE; - entry_ptr->free_file_space_on_destroy = FALSE; /* Initialize flush dependency height fields */ entry_ptr->flush_dep_parent = NULL; @@ -2860,11 +3132,9 @@ H5C_insert_entry(H5F_t * f, */ result = H5C_make_space_in_cache(f, - primary_dxpl_id, - secondary_dxpl_id, + dxpl_id, space_needed, - write_permitted, - &first_flush); + write_permitted); if ( result < 0 ) { @@ -2956,18 +3226,39 @@ done: * Programmer: John Mainzer * 7/5/05 * + * Changes: Tidied up code, removeing some old commented out + * code that had been left in pending success of the + * new version. + * + * Note that unlike H5C_apply_candidate_list(), + * H5C_mark_entries_as_clean() makes all its calls to + * H6C_flush_single_entry() with the + * H5C__FLUSH_CLEAR_ONLY_FLAG set. As a result, + * the pre_serialize() and serialize calls are not made. + * + * This then implies that (assuming such actions were + * permitted in the parallel case) no loads, dirties, + * resizes, or removals of other entries can occur as + * a side effect of the flush. Hence, there is no need + * for the checks for entry removal / status change + * that I ported to H5C_apply_candidate_list(). + * + * However, if (in addition to allowing such operations + * in the parallel case), we allow such operations outside + * of the pre_serialize / serialize routines, this may + * cease to be the case -- requiring a review of this + * function. + * *------------------------------------------------------------------------- */ #ifdef H5_HAVE_PARALLEL herr_t H5C_mark_entries_as_clean(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, + hid_t dxpl_id, int32_t ce_array_len, haddr_t * ce_array_ptr) { H5C_t * cache_ptr; - hbool_t first_flush = TRUE; int entries_cleared; int entries_examined; int i; @@ -3061,27 +3352,9 @@ H5C_mark_entries_as_clean(H5F_t * f, #endif /* H5C_DO_SANITY_CHECKS */ HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \ "Listed entry not dirty?!?!?.") -#if 0 /* original code */ - } else if ( entry_ptr->is_protected ) { - - entry_ptr->clear_on_unprotect = TRUE; } else { - if ( H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - entry_ptr->type, - addr, - H5C__FLUSH_CLEAR_ONLY_FLAG, - &first_flush, - TRUE) < 0 ) { - - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't clear entry.") - } - } -#else /* modified code */ - } else { /* Mark the entry to be cleared on unprotect. We will * scan the LRU list shortly, and clear all those entries * not currently protected. @@ -3102,13 +3375,32 @@ H5C_mark_entries_as_clean(H5F_t * f, } #endif /* H5C_DO_SANITY_CHECKS */ } -#endif /* end modified code */ } -#if 1 /* modified code */ + /* Scan through the LRU list from back to front, and flush the * entries whose clear_on_unprotect flags are set. Observe that * any protected entries will not be on the LRU, and therefore * will not be flushed at this time. + * + * Note that unlike H5C_apply_candidate_list(), + * H5C_mark_entries_as_clean() makes all its calls to + * H6C_flush_single_entry() with the H5C__FLUSH_CLEAR_ONLY_FLAG + * set. As a result, the pre_serialize() and serialize calls are + * not made. + * + * This then implies that (assuming such actions were + * permitted in the parallel case) no loads, dirties, + * resizes, or removals of other entries can occur as + * a side effect of the flush. Hence, there is no need + * for the checks for entry removal / status change + * that I ported to H5C_apply_candidate_list(). + * + * However, if (in addition to allowing such operations + * in the parallel case), we allow such operations outside + * of the pre_serialize / serialize routines, this may + * cease to be the case -- requiring a review of this + * point. + * JRM -- 4/7/15 */ entries_cleared = 0; @@ -3128,13 +3420,11 @@ H5C_mark_entries_as_clean(H5F_t * f, entries_cleared++; if ( H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - clear_ptr->type, + dxpl_id, clear_ptr->addr, H5C__FLUSH_CLEAR_ONLY_FLAG, - &first_flush, - TRUE) < 0 ) { + TRUE, + NULL) < 0 ) { HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't clear entry.") } @@ -3165,13 +3455,11 @@ H5C_mark_entries_as_clean(H5F_t * f, entries_cleared++; if ( H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - clear_ptr->type, + dxpl_id, clear_ptr->addr, H5C__FLUSH_CLEAR_ONLY_FLAG, - &first_flush, - TRUE) < 0 ) { + TRUE, + NULL) < 0 ) { HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't clear entry.") } @@ -3202,7 +3490,6 @@ H5C_mark_entries_as_clean(H5F_t * f, } HDassert( (entries_cleared + i) == ce_array_len ); #endif /* H5C_DO_SANITY_CHECKS */ -#endif /* modified code */ done: @@ -3278,6 +3565,7 @@ H5C_mark_entry_dirty(void *thing) /* mark the entry as dirty if it isn't already */ entry_ptr->is_dirty = TRUE; + entry_ptr->image_up_to_date = FALSE; if ( was_pinned_unprotected_and_clean ) { @@ -3427,36 +3715,32 @@ H5C_move_entry(H5C_t * cache_ptr, was_dirty = entry_ptr->is_dirty; #endif /* H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS */ - if ( ! ( entry_ptr->flush_in_progress ) ) { - - entry_ptr->is_dirty = TRUE; - } + entry_ptr->is_dirty = TRUE; + /* This shouldn't be needed, but it keeps the test code happy */ + entry_ptr->image_up_to_date = FALSE; H5C__INSERT_IN_INDEX(cache_ptr, entry_ptr, FAIL) - if ( ! ( entry_ptr->flush_in_progress ) ) { - - H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL) + H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL) #if H5C_DO_SANITY_CHECKS - if ( removed_entry_from_slist ) { - - /* we just removed the entry from the slist. Thus we - * must touch up cache_ptr->slist_len_increase and - * cache_ptr->slist_size_increase to keep from skewing - * the sanity checks. - */ - HDassert( cache_ptr->slist_len_increase > 1 ); - HDassert( cache_ptr->slist_size_increase > - (int64_t)(entry_ptr->size) ); + if ( removed_entry_from_slist ) { - cache_ptr->slist_len_increase -= 1; - cache_ptr->slist_size_increase -= (int64_t)(entry_ptr->size); - } + /* we just removed the entry from the slist. Thus we + * must touch up cache_ptr->slist_len_increase and + * cache_ptr->slist_size_increase to keep from skewing + * the sanity checks. + */ + cache_ptr->slist_len_increase -= 1; + cache_ptr->slist_size_increase -= (int64_t)(entry_ptr->size); + } #endif /* H5C_DO_SANITY_CHECKS */ + if ( ! ( entry_ptr->flush_in_progress ) ) { + + /* skip the update if a flush is in progress */ H5C__UPDATE_RP_FOR_MOVE(cache_ptr, entry_ptr, was_dirty, FAIL) } } @@ -3536,6 +3820,11 @@ H5C_resize_entry(void *thing, size_t new_size) /* mark the entry as dirty if it isn't already */ entry_ptr->is_dirty = TRUE; + entry_ptr->image_up_to_date = FALSE; + + /* Release the current image */ + if( entry_ptr->image_ptr ) + entry_ptr->image_ptr = H5MM_xfree(entry_ptr->image_ptr); /* do a flash cache size increase if appropriate */ if ( cache_ptr->flash_size_increase_possible ) { @@ -3743,18 +4032,6 @@ done: * or flushed -- nor may it be accessed by another call to * H5C_protect. Any attempt to do so will result in a failure. * - * The primary_dxpl_id and secondary_dxpl_id parameters - * specify the dxpl_ids used on the first write occasioned - * by the insertion (primary_dxpl_id), and on all subsequent - * writes (secondary_dxpl_id). This is useful in the - * metadata cache, but may not be needed elsewhere. If so, - * just use the same dxpl_id for both parameters. - * - * All reads are performed with the primary_dxpl_id. - * - * Similarly, the primary_dxpl_id is passed to the - * check_write_permitted function if it is called. - * * Return: Success: Ptr to the desired entry * Failure: NULL * @@ -3776,12 +4053,21 @@ done: * entries long before we actually have to evict something * to make space. * + * JRM -- 9/1/14 + * Replace the old rw parameter with the flags parameter. + * This allows H5C_protect to accept flags other than + * H5C__READ_ONLY_FLAG. + * + * Added support for the H5C__FLUSH_LAST_FLAG and + * H5C__FLUSH_COLLECTIVELY_FLAG flags. At present, these + * flags are only applied if the entry is not in cache, and + * is loaded into the cache as a result of this call. + * *------------------------------------------------------------------------- */ void * H5C_protect(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, + hid_t dxpl_id, const H5C_class_t * type, haddr_t addr, void * udata, @@ -3789,9 +4075,12 @@ H5C_protect(H5F_t * f, { H5C_t * cache_ptr; hbool_t hit; - hbool_t first_flush; hbool_t have_write_permitted = FALSE; hbool_t read_only = FALSE; + hbool_t flush_last; +#ifdef H5_HAVE_PARALLEL + hbool_t flush_collectively; +#endif /* H5_HAVE_PARALLEL */ hbool_t write_permitted; herr_t result; size_t empty_space; @@ -3812,8 +4101,6 @@ H5C_protect(H5F_t * f, HDassert( cache_ptr ); HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC ); HDassert( type ); - HDassert( type->flush ); - HDassert( type->load ); HDassert( H5F_addr_defined(addr) ); #if H5C_DO_EXTREME_SANITY_CHECKS @@ -3827,6 +4114,10 @@ H5C_protect(H5F_t * f, #endif /* H5C_DO_EXTREME_SANITY_CHECKS */ read_only = ( (flags & H5C__READ_ONLY_FLAG) != 0 ); + flush_last = ( (flags & H5C__FLUSH_LAST_FLAG) != 0 ); +#ifdef H5_HAVE_PARALLEL + flush_collectively = ( (flags & H5C__FLUSH_COLLECTIVELY_FLAG) != 0 ); +#endif /* H5_HAVE_PARALLEL */ /* first check to see if the target is in cache */ H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, NULL) @@ -3845,7 +4136,7 @@ H5C_protect(H5F_t * f, from disk. */ /* Get the dataset transfer property list */ - if(NULL == (dxpl = (H5P_genplist_t *)H5I_object_verify(primary_dxpl_id, H5I_GENPROP_LST))) + if(NULL == (dxpl = (H5P_genplist_t *)H5I_object_verify(dxpl_id, H5I_GENPROP_LST))) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a property list"); /* Get the tag from the DXPL */ @@ -3871,7 +4162,7 @@ H5C_protect(H5F_t * f, hit = FALSE; - thing = H5C_load_entry(f, primary_dxpl_id, type, addr, udata); + thing = H5C_load_entry(f, dxpl_id, type, addr, udata); if ( thing == NULL ) { @@ -3881,7 +4172,7 @@ H5C_protect(H5F_t * f, entry_ptr = (H5C_cache_entry_t *)thing; /* Apply tag to newly protected entry */ - if(H5C_tag_entry(cache_ptr, entry_ptr, primary_dxpl_id) < 0) + if(H5C_tag_entry(cache_ptr, entry_ptr, dxpl_id) < 0) HGOTO_ERROR(H5E_CACHE, H5E_CANTTAG, NULL, "Cannot tag metadata entry") /* If the entry is very large, and we are configured to allow it, @@ -3936,7 +4227,6 @@ H5C_protect(H5F_t * f, have_write_permitted = TRUE; - first_flush = TRUE; } } else { @@ -3944,7 +4234,6 @@ H5C_protect(H5F_t * f, have_write_permitted = TRUE; - first_flush = TRUE; } HDassert( entry_ptr->size <= H5C_MAX_ENTRY_SIZE ); @@ -3985,10 +4274,10 @@ H5C_protect(H5F_t * f, * see no point in worrying about the fourth. */ - result = H5C_make_space_in_cache(f, primary_dxpl_id, - secondary_dxpl_id, - space_needed, write_permitted, - &first_flush); + result = H5C_make_space_in_cache(f, + dxpl_id, + space_needed, + write_permitted); if ( result < 0 ) { @@ -4002,7 +4291,24 @@ H5C_protect(H5F_t * f, * * This is no longer true -- due to a bug fix, we may modify * data on load to repair a file. + * + * ******************************************* + * + * Set the flush_last (and possibly flush_collectively) fields + * of the newly loaded entry before inserting it into the + * index. Must do this, as the index tracked the number of + * entries with the flush_last field set, but assumes that + * the field will not change after insertion into the index. + * + * Note that this means that the H5C__FLUSH_LAST_FLAG and + * H5C__FLUSH_COLLECTIVELY_FLAG flags are ignored if the + * entry is already in cache. */ + entry_ptr->flush_me_last = flush_last; +#ifdef H5_HAVE_PARALLEL + entry_ptr->flush_me_collectively = flush_collectively; +#endif + H5C__INSERT_IN_INDEX(cache_ptr, entry_ptr, NULL) if ( ( entry_ptr->is_dirty ) && ( ! (entry_ptr->in_slist) ) ) { @@ -4017,11 +4323,11 @@ H5C_protect(H5F_t * f, */ H5C__UPDATE_RP_FOR_INSERTION(cache_ptr, entry_ptr, NULL) - /* If the entry's type has a 'notify' callback send a 'after insertion' + /* If the entry's type has a 'notify' callback send a 'after load' * notice now that the entry is fully integrated into the cache. */ if(entry_ptr->type->notify && - (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_AFTER_INSERT, entry_ptr) < 0) + (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_AFTER_LOAD, entry_ptr) < 0) HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, NULL, "can't notify client about entry inserted into cache") } @@ -4083,7 +4389,6 @@ H5C_protect(H5F_t * f, have_write_permitted = TRUE; - first_flush = TRUE; } } else { @@ -4091,7 +4396,6 @@ H5C_protect(H5F_t * f, have_write_permitted = TRUE; - first_flush = TRUE; } } @@ -4100,10 +4404,8 @@ H5C_protect(H5F_t * f, (cache_ptr->resize_ctl).epoch_length ) ) { result = H5C__auto_adjust_cache_size(f, - primary_dxpl_id, - secondary_dxpl_id, - write_permitted, - &first_flush); + dxpl_id, + write_permitted); if ( result != SUCCEED ) { HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, \ @@ -4137,10 +4439,10 @@ H5C_protect(H5F_t * f, if(cache_ptr->index_size > cache_ptr->max_cache_size) cache_ptr->cache_full = TRUE; - result = H5C_make_space_in_cache(f, primary_dxpl_id, - secondary_dxpl_id, - (size_t)0, write_permitted, - &first_flush); + result = H5C_make_space_in_cache(f, + dxpl_id, + (size_t)0, + write_permitted); if ( result < 0 ) { @@ -4636,6 +4938,10 @@ done: * total_entries_skipped_in_msic, total_entries_scanned_in_msic, * and max_entries_skipped_in_msic fields. * + * JRM -- 4/11/15 + * Added code displaying the new slist_scan_restarts, + * LRU_scan_restarts, and hash_bucket_scan_restarts fields; + * *------------------------------------------------------------------------- */ herr_t @@ -4659,6 +4965,7 @@ H5C_stats(H5C_t * cache_ptr, int64_t total_clears = 0; int64_t total_flushes = 0; int64_t total_evictions = 0; + int64_t total_take_ownerships = 0; int64_t total_moves = 0; int64_t total_entry_flush_moves = 0; int64_t total_cache_flush_moves = 0; @@ -4687,6 +4994,8 @@ H5C_stats(H5C_t * cache_ptr, FUNC_ENTER_NOAPI(FAIL) + HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC ); + /* This would normally be an assert, but we need to use an HGOTO_ERROR * call to shut up the compiler. */ @@ -4713,6 +5022,7 @@ H5C_stats(H5C_t * cache_ptr, total_clears += cache_ptr->clears[i]; total_flushes += cache_ptr->flushes[i]; total_evictions += cache_ptr->evictions[i]; + total_take_ownerships += cache_ptr->take_ownerships[i]; total_moves += cache_ptr->moves[i]; total_entry_flush_moves += cache_ptr->entry_flush_moves[i]; total_cache_flush_moves += cache_ptr->cache_flush_moves[i]; @@ -4864,11 +5174,16 @@ H5C_stats(H5C_t * cache_ptr, (long)max_read_protects); HDfprintf(stdout, - "%s Total clears / flushes / evictions = %ld / %ld / %ld\n", + "%s Total clears / flushes = %ld / %ld\n", cache_ptr->prefix, (long)total_clears, - (long)total_flushes, - (long)total_evictions); + (long)total_flushes); + + HDfprintf(stdout, + "%s Total evictions / take ownerships = %ld / %ld\n", + cache_ptr->prefix, + (long)total_evictions, + (long)total_take_ownerships); HDfprintf(stdout, "%s Total insertions(pinned) / moves = %ld(%ld) / %ld\n", @@ -4940,6 +5255,13 @@ H5C_stats(H5C_t * cache_ptr, (long long)(cache_ptr->total_entries_scanned_in_msic - cache_ptr->entries_scanned_to_make_space)); + HDfprintf(stdout, + "%s slist/LRU/hash bkt scan restarts = %lld / %lld / %lld.\n", + cache_ptr->prefix, + (long long)(cache_ptr->slist_scan_restarts), + (long long)(cache_ptr->LRU_scan_restarts), + (long long)(cache_ptr->hash_bucket_scan_restarts)); + #if H5C_COLLECT_CACHE_ENTRY_STATS HDfprintf(stdout, "%s aggregate max / min accesses = %d / %d\n", @@ -4993,11 +5315,16 @@ H5C_stats(H5C_t * cache_ptr, (int)(cache_ptr->max_read_protects[i])); HDfprintf(stdout, - "%s clears / flushes / evictions = %ld / %ld / %ld\n", + "%s clears / flushes = %ld / %ld\n", cache_ptr->prefix, (long)(cache_ptr->clears[i]), - (long)(cache_ptr->flushes[i]), - (long)(cache_ptr->evictions[i])); + (long)(cache_ptr->flushes[i])); + + HDfprintf(stdout, + "%s evictions / take ownerships = %ld / %ld\n", + cache_ptr->prefix, + (long)(cache_ptr->evictions[i]), + (long)(cache_ptr->take_ownerships[i])); HDfprintf(stdout, "%s insertions(pinned) / moves = %ld(%ld) / %ld\n", @@ -5092,6 +5419,11 @@ done: * total_entries_skipped_in_msic, total_entries_scanned_in_msic, * and max_entries_skipped_in_msic fields. * + * JRM 4/11/15 + * Added code to initialize the new slist_scan_restarts, + * LRU_scan_restarts, hash_bucket_scan_restarts, and + * take_ownerships fields. + * *------------------------------------------------------------------------- */ void @@ -5125,6 +5457,7 @@ H5C_stats__reset(H5C_t H5_ATTR_UNUSED * cache_ptr) cache_ptr->clears[i] = 0; cache_ptr->flushes[i] = 0; cache_ptr->evictions[i] = 0; + cache_ptr->take_ownerships[i] = 0; cache_ptr->moves[i] = 0; cache_ptr->entry_flush_moves[i] = 0; cache_ptr->cache_flush_moves[i] = 0; @@ -5167,6 +5500,10 @@ H5C_stats__reset(H5C_t H5_ATTR_UNUSED * cache_ptr) cache_ptr->max_entries_scanned_in_msic = 0; cache_ptr->entries_scanned_to_make_space = 0; + cache_ptr->slist_scan_restarts = 0; + cache_ptr->LRU_scan_restarts = 0; + cache_ptr->hash_bucket_scan_restarts = 0; + #if H5C_COLLECT_CACHE_ENTRY_STATS for ( i = 0; i <= cache_ptr->max_type_id; i++ ) @@ -5319,6 +5656,107 @@ done: /*------------------------------------------------------------------------- + * Function: H5C_dump_cache_skip_list + * + * Purpose: Debugging routine that prints a summary of the contents of + * the skip list used by the metadata cache metadata cache to + * maintain an address sorted list of dirty entries. + * + * Return: Non-negative on success/Negative on failure + * + * Programmer: John Mainzer + * 11/15/14 + * + *------------------------------------------------------------------------- + */ +#if 0 /* debugging routine */ +herr_t +H5C_dump_cache_skip_list(H5C_t * cache_ptr, char * calling_fcn) +{ + herr_t ret_value = SUCCEED; /* Return value */ + int i; + H5C_cache_entry_t * entry_ptr = NULL; + H5SL_node_t * node_ptr = NULL; + + FUNC_ENTER_NOAPI(FAIL) + + HDassert(cache_ptr != NULL); + HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC); + HDassert(calling_fcn != NULL); + + HDfprintf(stdout, "\n\nDumping metadata cache skip list from %s.\n", + calling_fcn); + HDfprintf(stdout, " slist len = %d.\n", cache_ptr->slist_len); + HDfprintf(stdout, " slist size = %lld.\n", + (long long)(cache_ptr->slist_size)); + + if ( cache_ptr->slist_len > 0 ) + { + /* If we get this far, all entries in the cache are listed in the + * skip list -- scan the skip list generating the desired output. + */ + + HDfprintf(stdout, + "Num: Addr: Len: Prot/Pind: Dirty: Type:\n"); + + i = 0; + + node_ptr = H5SL_first(cache_ptr->slist_ptr); + + if ( node_ptr != NULL ) { + + entry_ptr = (H5C_cache_entry_t *)H5SL_item(node_ptr); + + } else { + + entry_ptr = NULL; + } + + while ( entry_ptr != NULL ) { + + HDassert( entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC ); + + HDfprintf(stdout, + "%s%d 0x%016llx %4lld %d/%d %d %s\n", + cache_ptr->prefix, i, + (long long)(entry_ptr->addr), + (long long)(entry_ptr->size), + (int)(entry_ptr->is_protected), + (int)(entry_ptr->is_pinned), + (int)(entry_ptr->is_dirty), + entry_ptr->type->name); + + HDfprintf(stdout, " node_ptr = 0x%llx, item = 0x%llx\n", + (unsigned long long)node_ptr, + (unsigned long long)H5SL_item(node_ptr)); + + /* increment node_ptr before we delete its target */ + node_ptr = H5SL_next(node_ptr); + + if ( node_ptr != NULL ) { + + entry_ptr = (H5C_cache_entry_t *)H5SL_item(node_ptr); + + } else { + + entry_ptr = NULL; + } + + i++; + } + } + + HDfprintf(stdout, "\n\n"); + +done: + + FUNC_LEAVE_NOAPI(ret_value) + +} /* H5C_dump_cache_skip_list() */ +#endif /* debugging routine */ + + +/*------------------------------------------------------------------------- * Function: H5C_unpin_entry_from_client() * * Purpose: Internal routine to unpin a cache entry from a client action. @@ -5474,8 +5912,7 @@ done: */ herr_t H5C_unprotect(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, + hid_t dxpl_id, const H5C_class_t * type, haddr_t addr, void * thing, @@ -5515,8 +5952,6 @@ H5C_unprotect(H5F_t * f, HDassert( cache_ptr ); HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC ); HDassert( type ); - HDassert( type->clear ); - HDassert( type->flush ); HDassert( H5F_addr_defined(addr) ); HDassert( thing ); HDassert( ! ( pin_entry && unpin_entry ) ); @@ -5615,6 +6050,19 @@ H5C_unprotect(H5F_t * f, /* Mark the entry as dirty if appropriate */ entry_ptr->is_dirty = (entry_ptr->is_dirty || dirtied); + /* the image_up_to_date field was introduced to support + * journaling. Until we re-introduce journaling, this + * field should be equal to !entry_ptr->is_dirty. + * + * When journaling is re-enabled it should be set + * to FALSE if dirtied is TRUE. + */ +#if 1 /* JRM */ + entry_ptr->image_up_to_date = FALSE; +#else /* JRM */ + entry_ptr->image_up_to_date = !entry_ptr->is_dirty; +#endif /* JRM */ + /* Update index for newly dirtied entry */ if(was_clean && entry_ptr->is_dirty) H5C__UPDATE_INDEX_FOR_ENTRY_DIRTY(cache_ptr, entry_ptr) @@ -5656,13 +6104,6 @@ H5C_unprotect(H5F_t * f, * JRM - 5/19/04 */ if ( deleted ) { - - /* the following first flush flag will never be used as we are - * calling H5C_flush_single_entry with both the - * H5C__FLUSH_CLEAR_ONLY_FLAG and H5C__FLUSH_INVALIDATE_FLAG flags. - * However, it is needed for the function call. - */ - hbool_t dummy_first_flush = TRUE; unsigned flush_flags = (H5C__FLUSH_CLEAR_ONLY_FLAG | H5C__FLUSH_INVALIDATE_FLAG); @@ -5684,36 +6125,40 @@ H5C_unprotect(H5F_t * f, "hash table contains multiple entries for addr?!?.") } - /* Pass along 'free file space' flag to cache client */ - - entry_ptr->free_file_space_on_destroy = free_file_space; + /* Set the 'free file space' flag for the flush, if needed */ + if(free_file_space) + flush_flags |= H5C__FREE_FILE_SPACE_FLAG; /* Set the "take ownership" flag for the flush, if needed */ if(take_ownership) flush_flags |= H5C__TAKE_OWNERSHIP_FLAG; if ( H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - type, + dxpl_id, addr, flush_flags, - &dummy_first_flush, - TRUE) < 0 ) { + TRUE, + NULL) < 0 ) { HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "Can't flush.") } + +#if H5C_DO_SANITY_CHECKS + if ( ( take_ownership ) && ( ! was_clean ) ) + { + /* we have just removed an entry from the skip list. Thus + * we must touch up cache_ptr->slist_len_increase and + * cache_ptr->slist_size_increase to keep from skewing + * the sanity checks on flushes. + */ + cache_ptr->slist_len_increase -= 1; + cache_ptr->slist_size_increase -= (int64_t)(entry_ptr->size); + } +#endif /* H5C_DO_SANITY_CHECKS */ } #ifdef H5_HAVE_PARALLEL else if ( clear_entry ) { - /* the following first flush flag will never be used as we are - * calling H5C_flush_single_entry with the - * H5C__FLUSH_CLEAR_ONLY_FLAG flag. However, it is needed for - * the function call. - */ - hbool_t dummy_first_flush = TRUE; - /* verify that the target entry is in the cache. */ H5C__SEARCH_INDEX(cache_ptr, addr, test_entry_ptr, FAIL) @@ -5730,13 +6175,11 @@ H5C_unprotect(H5F_t * f, } if ( H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - type, + dxpl_id, addr, H5C__FLUSH_CLEAR_ONLY_FLAG, - &dummy_first_flush, - TRUE) < 0 ) { + TRUE, + NULL) < 0 ) { HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "Can't clear.") } @@ -6392,10 +6835,8 @@ done: */ static herr_t H5C__auto_adjust_cache_size(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - hbool_t write_permitted, - hbool_t * first_flush_ptr) + hid_t dxpl_id, + hbool_t write_permitted) { H5C_t * cache_ptr = f->shared->cache; herr_t result; @@ -6596,13 +7037,11 @@ H5C__auto_adjust_cache_size(H5F_t * f, } else { result = H5C__autoadjust__ageout(f, + dxpl_id, hit_rate, &status, &new_max_cache_size, - primary_dxpl_id, - secondary_dxpl_id, - write_permitted, - first_flush_ptr); + write_permitted); if ( result != SUCCEED ) { @@ -6745,13 +7184,11 @@ done: */ static herr_t H5C__autoadjust__ageout(H5F_t * f, + hid_t dxpl_id, double hit_rate, enum H5C_resize_status * status_ptr, size_t * new_max_cache_size_ptr, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - hbool_t write_permitted, - hbool_t * first_flush_ptr) + hbool_t write_permitted) { H5C_t * cache_ptr = f->shared->cache; herr_t result; @@ -6792,8 +7229,7 @@ H5C__autoadjust__ageout(H5F_t * f, if ( cache_ptr->max_cache_size > (cache_ptr->resize_ctl).min_size ){ /* evict aged out cache entries if appropriate... */ - if(H5C__autoadjust__ageout__evict_aged_out_entries(f, primary_dxpl_id, - secondary_dxpl_id, write_permitted, first_flush_ptr) < 0) + if(H5C__autoadjust__ageout__evict_aged_out_entries(f, dxpl_id, write_permitted) < 0) HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "error flushing aged out entries.") /* ... and then reduce cache size if appropriate */ @@ -6990,20 +7426,32 @@ done: * * Programmer: John Mainzer, 11/22/04 * + * Changes: Modified function to detect deletions of entries + * during a scan of the LRU, and where appropriate, + * restart the scan to avoid proceeding with a next + * entry that is no longer in the cache. + * + * Note the absence of checks after flushes of clean + * entries. As a second entry can only be removed by + * by a call to the pre_serialize or serialize callback + * of the first, and as these callbacks will not be called + * on clean entries, no checks are needed. + * + * JRM -- 4/6/15 + * *------------------------------------------------------------------------- */ static herr_t H5C__autoadjust__ageout__evict_aged_out_entries(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - hbool_t write_permitted, - hbool_t * first_flush_ptr) + hid_t dxpl_id, + hbool_t write_permitted) { H5C_t * cache_ptr = f->shared->cache; herr_t result; size_t eviction_size_limit; size_t bytes_evicted = 0; hbool_t prev_is_dirty = FALSE; + hbool_t restart_scan; H5C_cache_entry_t * entry_ptr; H5C_cache_entry_t * next_ptr; H5C_cache_entry_t * prev_ptr; @@ -7032,13 +7480,17 @@ H5C__autoadjust__ageout__evict_aged_out_entries(H5F_t * f, if ( write_permitted ) { + restart_scan = FALSE; entry_ptr = cache_ptr->LRU_tail_ptr; while ( ( entry_ptr != NULL ) && ( (entry_ptr->type)->id != H5C__EPOCH_MARKER_TYPE ) && ( bytes_evicted < eviction_size_limit ) ) { + HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC); HDassert( ! (entry_ptr->is_protected) ); + HDassert( ! (entry_ptr->is_read_only) ); + HDassert( (entry_ptr->ro_ref_count) == 0 ); next_ptr = entry_ptr->next; prev_ptr = entry_ptr->prev; @@ -7050,26 +7502,39 @@ H5C__autoadjust__ageout__evict_aged_out_entries(H5F_t * f, if ( entry_ptr->is_dirty ) { + /* reset entries_removed_counter and + * last_entry_removed_ptr prior to the call to + * H5C_flush_single_entry() so that we can spot + * unexpected removals of entries from the cache, + * and set the restart_scan flag if proceeding + * would be likely to cause us to scan an entry + * that is no longer in the cache. + */ + cache_ptr->entries_removed_counter = 0; + cache_ptr->last_entry_removed_ptr = NULL; + result = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - entry_ptr->type, + dxpl_id, entry_ptr->addr, H5C__NO_FLAGS_SET, - first_flush_ptr, - FALSE); + FALSE, + NULL); + + if ( ( cache_ptr->entries_removed_counter > 1 ) || + ( cache_ptr->last_entry_removed_ptr == prev_ptr ) ) + + restart_scan = TRUE; + } else { bytes_evicted += entry_ptr->size; result = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - entry_ptr->type, + dxpl_id, entry_ptr->addr, H5C__FLUSH_INVALIDATE_FLAG, - first_flush_ptr, - TRUE); + TRUE, + NULL); } if ( result < 0 ) { @@ -7079,30 +7544,25 @@ H5C__autoadjust__ageout__evict_aged_out_entries(H5F_t * f, } if ( prev_ptr != NULL ) { -#ifndef NDEBUG - if ( prev_ptr->magic != H5C__H5C_CACHE_ENTRY_T_MAGIC ) { - - /* something horrible has happened to *prev_ptr -- - * scream and die. - */ - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \ - "*prev_ptr corrupt") - } else -#endif /* NDEBUG */ - if ( ( prev_ptr->is_dirty != prev_is_dirty ) - || - ( prev_ptr->next != next_ptr ) - || - ( prev_ptr->is_protected ) - || - ( prev_ptr->is_pinned ) ) { + if ( ( restart_scan ) + || + ( prev_ptr->is_dirty != prev_is_dirty ) + || + ( prev_ptr->next != next_ptr ) + || + ( prev_ptr->is_protected ) + || + ( prev_ptr->is_pinned ) ) { /* something has happened to the LRU -- start over * from the tail. */ + restart_scan = FALSE; entry_ptr = cache_ptr->LRU_tail_ptr; + H5C__UPDATE_STATS_FOR_LRU_SCAN_RESTART(cache_ptr) + } else { entry_ptr = prev_ptr; @@ -7161,13 +7621,11 @@ H5C__autoadjust__ageout__evict_aged_out_entries(H5F_t * f, if ( ! (entry_ptr->is_dirty) ) { result = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - entry_ptr->type, + dxpl_id, entry_ptr->addr, H5C__FLUSH_INVALIDATE_FLAG, - first_flush_ptr, - TRUE); + TRUE, + NULL); if ( result < 0 ) { @@ -7177,6 +7635,10 @@ H5C__autoadjust__ageout__evict_aged_out_entries(H5F_t * f, } /* just skip the entry if it is dirty, as we can't do * anything with it now since we can't write. + * + * Since all entries are clean, serialize() will not be called, + * and thus we needn't test to see if the LRU has been changed + * out from under us. */ entry_ptr = prev_ptr; @@ -7640,17 +8102,45 @@ done: * Programmer: John Mainzer * 3/24/065 * + * Changes: Modified function to test for slist chamges in + * pre_serialize and serialize callbacks, and re-start + * scans through the slist when such changes occur. + * + * This has been a potential problem for some time, + * and there has been code in this function to deal + * with elements of this issue. However the shift + * to the V3 cache in combination with the activities + * of some of the cache clients (in particular the + * free space manager and the fractal heap) have + * made this re-work necessary in H5C_flush_cache. + * + * At present, this issue doesn't seem to be causing problems + * in H5C_flush_invalidate_cache(). However, it seems + * prudent to port the H5C_flush_cache changes to this + * function as well. + * + * JRM -- 12/14/14 + * + * Added code to track entry size change during flush single + * entry. This didn't used to be a problem, as the entry + * was largely removed from the cache data structures before + * the flush proper. However, re-entrant calls to the cache + * in the parallel case required a re-factoring of the + * H5C_flush_single_entry() function to keep entries fully + * in the cache until after the pre-serialize and serialize + * calls. + * JRM -- 12/25/14 + * *------------------------------------------------------------------------- */ static herr_t -H5C_flush_invalidate_cache(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, +H5C_flush_invalidate_cache(const H5F_t * f, + hid_t dxpl_id, unsigned flags) { H5C_t * cache_ptr = f->shared->cache; herr_t status; - hbool_t first_flush = TRUE; + hbool_t restart_slist_scan; int32_t protected_entries = 0; int32_t i; int32_t cur_pel_len; @@ -7661,10 +8151,14 @@ H5C_flush_invalidate_cache(H5F_t * f, H5C_cache_entry_t * entry_ptr = NULL; H5C_cache_entry_t * next_entry_ptr = NULL; #if H5C_DO_SANITY_CHECKS - int64_t actual_slist_len = 0; + int64_t flushed_slist_len = 0; int64_t initial_slist_len = 0; - size_t actual_slist_size = 0; + int64_t flushed_slist_size = 0; size_t initial_slist_size = 0; + int64_t entry_size_change; + int64_t * entry_size_change_ptr = &entry_size_change; +#else /* H5C_DO_SANITY_CHECKS */ + int64_t * entry_size_change_ptr = NULL; #endif /* H5C_DO_SANITY_CHECKS */ herr_t ret_value = SUCCEED; @@ -7743,25 +8237,6 @@ H5C_flush_invalidate_cache(H5F_t * f, * may be created by the flush call backs. Thus it is possible * that the slist will not be empty after we finish the scan. */ - if ( cache_ptr->slist_len == 0 ) { - - node_ptr = NULL; - HDassert( cache_ptr->slist_size == 0 ); - - } else { - - /* Start at beginning of skip list each time */ - node_ptr = H5SL_first(cache_ptr->slist_ptr); - HDassert( node_ptr != NULL ); - - /* Get cache entry for this node */ - next_entry_ptr = (H5C_cache_entry_t *)H5SL_item(node_ptr); - if ( NULL == next_entry_ptr ) - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "next_entry_ptr == NULL ?!?!") - HDassert( next_entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC ); - HDassert( next_entry_ptr->is_dirty ); - HDassert( next_entry_ptr->in_slist ); - } #if H5C_DO_SANITY_CHECKS /* Depending on circumstances, H5C_flush_single_entry() will @@ -7785,63 +8260,80 @@ H5C_flush_invalidate_cache(H5F_t * f, cache_ptr->slist_len_increase = 0; cache_ptr->slist_size_increase = 0; - /* Finally, reset the actual_slist_len and actual_slist_size + /* Finally, reset the flushed_slist_len and flushed_slist_size * fields to zero, as these fields are used to accumulate * the slist lenght and size that we see as we scan through * the slist. */ - actual_slist_len = 0; - actual_slist_size = 0; + flushed_slist_len = 0; + flushed_slist_size = 0; #endif /* H5C_DO_SANITY_CHECKS */ - while ( node_ptr != NULL ) + /* set the cache_ptr->slist_change_in_pre_serialize and + * cache_ptr->slist_change_in_serialize to false. + * + * These flags are set to TRUE by H5C_flush_single_entry if the + * slist is modified by a pre_serialize or serialize call + * respectively. + * + * H5C_flush_invalidate_cache() uses these flags to detect any + * modifications to the slist that might corrupt the scan of + * the slist -- and restart the scan in this event. + */ + cache_ptr->slist_change_in_pre_serialize = FALSE; + cache_ptr->slist_change_in_serialize = FALSE; + + /* this done, start the scan of the slist */ + + restart_slist_scan = TRUE; + + while ( ( restart_slist_scan ) || ( node_ptr != NULL ) ) { - entry_ptr = next_entry_ptr; + if ( restart_slist_scan ) + { + restart_slist_scan = FALSE; - /* With the advent of the fractal heap, it is possible - * that the flush callback will dirty and/or resize - * other entries in the cache. In particular, while - * Quincey has promised me that this will never happen, - * it is possible that the flush callback for an - * entry may protect an entry that is not in the cache, - * perhaps causing the cache to flush and possibly - * evict the entry associated with node_ptr to make - * space for the new entry. - * - * Thus we do a bit of extra sanity checking on entry_ptr, - * and break out of this scan of the skip list if we - * detect major problems. We have a bit of leaway on the - * number of passes though the skip list, so this shouldn't - * be an issue in the flush in and of itself, as it should - * be all but impossible for this to happen more than once - * in any flush. - * - * Observe that that breaking out of the scan early - * shouldn't break the sanity checks just after the end - * of this while loop. - * - * If an entry has merely been marked clean and removed from - * the s-list, we simply break out of the scan. - * - * If the entry has been evicted, we flag an error and - * exit. - */ -#ifndef NDEBUG - if ( entry_ptr->magic != H5C__H5C_CACHE_ENTRY_T_MAGIC ) { + /* Start at beginning of skip list */ + node_ptr = H5SL_first(cache_ptr->slist_ptr); - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "entry_ptr->magic is invalid ?!?!") + if ( node_ptr == NULL ) + { + /* the slist is empty -- break out of inner loop */ + break; + } + HDassert( node_ptr != NULL ); - } else -#endif /* NDEBUG */ - if ( ( ! entry_ptr->is_dirty ) || - ( ! entry_ptr->in_slist ) ) { + /* Get cache entry for this node */ + next_entry_ptr = (H5C_cache_entry_t *)H5SL_item(node_ptr); - /* the s-list has been modified out from under us. - * break out of the loop. - */ - goto end_of_inner_loop;; + if(NULL == next_entry_ptr) + HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \ + "next_entry_ptr == NULL ?!?!") + + HDassert( next_entry_ptr->magic == \ + H5C__H5C_CACHE_ENTRY_T_MAGIC ); + HDassert( next_entry_ptr->is_dirty ); + HDassert( next_entry_ptr->in_slist ); } + entry_ptr = next_entry_ptr; + + /* It is possible that entries will be dirtied, resized, + * flushed, or removed from the cache via the take ownership + * flag as the result of pre_serialize or serialized callbacks. + * + * This in turn can corrupt the scan through the slist. + * + * We test for slist modifications in the pre_serialize + * and serialize callbacks, and restart the scan of the + * slist if we find them. However, best we do some extra + * sanity checking just in case. + */ + + HDassert( entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC ); + HDassert( entry_ptr->in_slist ); + HDassert( entry_ptr->is_dirty ); + /* increment node pointer now, before we delete its target * from the slist. */ @@ -7854,6 +8346,7 @@ H5C_flush_invalidate_cache(H5F_t * f, HDassert( next_entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC ); HDassert( next_entry_ptr->is_dirty ); HDassert( next_entry_ptr->in_slist ); + HDassert( entry_ptr != next_entry_ptr ); } else { next_entry_ptr = NULL; } @@ -7877,21 +8370,6 @@ H5C_flush_invalidate_cache(H5F_t * f, ( cache_ptr->num_last_entries >= cache_ptr->slist_len ) ) ) { -#if H5C_DO_SANITY_CHECKS - /* update actual_slist_len & actual_slist_size before - * the flush. Note that the entry will be removed - * from the slist after the flush, and thus may be - * resized by the flush callback. This is OK, as - * we will catch the size delta in - * cache_ptr->slist_size_increase. - * - * Note that we include pinned entries in this count, even - * though we will not actually flush them. - */ - actual_slist_len++; - actual_slist_size += entry_ptr->size; -#endif /* H5C_DO_SANITY_CHECKS */ - if ( entry_ptr->is_protected ) { /* we have major problems -- but lets flush @@ -7907,14 +8385,26 @@ H5C_flush_invalidate_cache(H5F_t * f, * as pinned entries can't be evicted. */ if(entry_ptr->flush_dep_height == curr_flush_dep_height ) { +#if H5C_DO_SANITY_CHECKS + /* update flushed_slist_len & flushed_slist_size + * before the flush. Note that the entry will + * be removed from the slist after the flush, + * and thus may be resized by the flush callback. + * This is OK, as we will catch the size delta in + * cache_ptr->slist_size_increase. + * + */ + flushed_slist_len++; + flushed_slist_size += (int64_t)entry_ptr->size; + entry_size_change = 0; +#endif /* H5C_DO_SANITY_CHECKS */ + status = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - NULL, + dxpl_id, entry_ptr->addr, H5C__NO_FLAGS_SET, - &first_flush, - FALSE); + FALSE, + entry_size_change_ptr); if ( status < 0 ) { /* This shouldn't happen -- if it does, we @@ -7924,7 +8414,32 @@ H5C_flush_invalidate_cache(H5F_t * f, HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ "dirty pinned entry flush failed.") } /* end if */ + +#if H5C_DO_SANITY_CHECKS + /* entry size may have changed during the flush. + * Update flushed_slist_size to account for this. + */ + flushed_slist_size += entry_size_change; +#endif /* H5C_DO_SANITY_CHECKS */ + flushed_during_dep_loop = TRUE; + + if ( ( cache_ptr->slist_change_in_serialize ) || + ( cache_ptr->slist_change_in_pre_serialize ) ) + { + /* The slist has been modified by something + * other than the simple removal of the + * of the flushed entry after the flush. + * + * This has the potential to corrupt the + * scan through the slist, so restart it. + */ + restart_slist_scan = TRUE; + cache_ptr->slist_change_in_pre_serialize + = FALSE; + cache_ptr->slist_change_in_serialize = FALSE; + H5C__UPDATE_STATS_FOR_SLIST_SCAN_RESTART(cache_ptr); + } } /* end if */ else if(entry_ptr->flush_dep_height < curr_flush_dep_height) /* This shouldn't happen -- if it does, just scream and die. */ @@ -7932,15 +8447,26 @@ H5C_flush_invalidate_cache(H5F_t * f, } /* end if */ else { if(entry_ptr->flush_dep_height == curr_flush_dep_height ){ +#if H5C_DO_SANITY_CHECKS + /* update flushed_slist_len & flushed_slist_size + * before the flush. Note that the entry will + * be removed from the slist after the flush, + * and thus may be resized by the flush callback. + * This is OK, as we will catch the size delta in + * cache_ptr->slist_size_increase. + * + */ + flushed_slist_len++; + flushed_slist_size += (int64_t)entry_ptr->size; + entry_size_change = 0; +#endif /* H5C_DO_SANITY_CHECKS */ status = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - NULL, - entry_ptr->addr, - (cooked_flags | H5C__FLUSH_INVALIDATE_FLAG), - &first_flush, - TRUE); + dxpl_id, + entry_ptr->addr, + (cooked_flags | H5C__FLUSH_INVALIDATE_FLAG), + TRUE, + entry_size_change_ptr); if ( status < 0 ) { /* This shouldn't happen -- if it does, we @@ -7950,7 +8476,32 @@ H5C_flush_invalidate_cache(H5F_t * f, HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ "dirty entry flush destroy failed.") } /* end if */ + +#if H5C_DO_SANITY_CHECKS + /* entry size may have changed during the flush. + * Update flushed_slist_size to account for this. + */ + flushed_slist_size += entry_size_change; +#endif /* H5C_DO_SANITY_CHECKS */ + flushed_during_dep_loop = TRUE; + + if ((cache_ptr->slist_change_in_serialize) || + (cache_ptr->slist_change_in_pre_serialize)) + { + /* The slist has been modified by something + * other than the simple removal of the + * of the flushed entry after the flush. + * + * This has the potential to corrupt the + * scan through the slist, so restart it. + */ + restart_slist_scan = TRUE; + cache_ptr->slist_change_in_pre_serialize + = FALSE; + cache_ptr->slist_change_in_serialize = FALSE; + H5C__UPDATE_STATS_FOR_SLIST_SCAN_RESTART(cache_ptr) + } } /* end if */ else if(entry_ptr->flush_dep_height < curr_flush_dep_height) /* This shouldn't happen -- if it does, just scream and die. */ @@ -7971,11 +8522,10 @@ H5C_flush_invalidate_cache(H5F_t * f, if ( node_ptr == NULL ) { - HDassert( (actual_slist_len + cache_ptr->slist_len) == + HDassert( (flushed_slist_len + cache_ptr->slist_len) == (initial_slist_len + cache_ptr->slist_len_increase) ); - HDassert( (actual_slist_size + cache_ptr->slist_size) == - (initial_slist_size + - (size_t)(cache_ptr->slist_size_increase)) ); + HDassert( (flushed_slist_size + (int64_t)cache_ptr->slist_size) == + ((int64_t)initial_slist_size + cache_ptr->slist_size_increase) ); } #endif /* H5C_DO_SANITY_CHECKS */ @@ -7997,9 +8547,7 @@ H5C_flush_invalidate_cache(H5F_t * f, while ( next_entry_ptr != NULL ) { entry_ptr = next_entry_ptr; -#ifndef NDEBUG HDassert( entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC ); -#endif /* NDEBUG */ next_entry_ptr = entry_ptr->ht_next; HDassert ( ( next_entry_ptr == NULL ) || @@ -8028,14 +8576,40 @@ H5C_flush_invalidate_cache(H5F_t * f, * If we can, go ahead and flush. */ if(entry_ptr->flush_dep_height == curr_flush_dep_height ){ + /* if *entry_ptr is dirty, it is possible + * that one or more other entries may be + * either removed from the cache, loaded + * into the cache, or moved to a new location + * in the file as a side effect of the flush. + * + * If this happens, and one of the target + * entries happens to be the next entry in + * the hash bucket, we could find ourselves + * either find ourselves either scanning a + * non-existant entry, scanning through a + * different bucket, or skipping an entry. + * + * Neither of these are good, so restart the + * the scan at the head of the hash bucket + * after the flush if *entry_ptr was dirty, + * on the off chance that the next entry was + * a target. + * + * This is not as inefficient at it might seem, + * as hash buckets typically have at most two + * or three entries. + */ + hbool_t entry_was_dirty; + + entry_was_dirty = entry_ptr->is_dirty; + status = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - NULL, - entry_ptr->addr, - (cooked_flags | H5C__FLUSH_INVALIDATE_FLAG), - &first_flush, - TRUE); + dxpl_id, + entry_ptr->addr, + (cooked_flags | H5C__FLUSH_INVALIDATE_FLAG), + TRUE, + NULL); + if ( status < 0 ) { /* This shouldn't happen -- if it does, @@ -8045,6 +8619,17 @@ H5C_flush_invalidate_cache(H5F_t * f, HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ "Entry flush destroy failed.") } + + if ( entry_was_dirty ) { + + /* update stats for hash bucket scan + * restart here. + * -- JRM + */ + next_entry_ptr = cache_ptr->index[i]; + H5C__UPDATE_STATS_FOR_HASH_BUCKET_SCAN_RESTART(cache_ptr) + } + flushed_during_dep_loop = TRUE; } /* end if */ else if(entry_ptr->flush_dep_height < curr_flush_dep_height) @@ -8060,7 +8645,7 @@ H5C_flush_invalidate_cache(H5F_t * f, * of pinned entries from pass to pass. If it stops * shrinking before it hits zero, we scream and die. */ - /* if the flush function on the entry we last evicted + /* if the serialize function on the entry we last evicted * loaded an entry into cache (as Quincey has promised me * it never will), and if the cache was full, it is * possible that *next_entry_ptr was flushed or evicted. @@ -8069,8 +8654,13 @@ H5C_flush_invalidate_cache(H5F_t * f, * test is triggred, we are accessing a deallocated piece * of dynamically allocated memory, so we just scream and * die. + * + * Update: The code to restart the scan after flushes + * of dirty entries should make it impossible + * to satisfy the following test. Leave it in + * in case I am wrong. + * -- JRM */ -#ifndef NDEBUG if ( ( next_entry_ptr != NULL ) && ( next_entry_ptr->magic != H5C__H5C_CACHE_ENTRY_T_MAGIC ) ) { @@ -8081,7 +8671,6 @@ H5C_flush_invalidate_cache(H5F_t * f, HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \ "next_entry_ptr->magic is invalid?!?!?.") } -#endif /* NDEBUG */ } /* end while loop scanning hash table bin */ } /* end for loop scanning hash table */ @@ -8099,7 +8688,6 @@ H5C_flush_invalidate_cache(H5F_t * f, curr_flush_dep_height++; } /* end while loop over flush dependency heights */ -end_of_inner_loop: old_pel_len = cur_pel_len; cur_pel_len = cache_ptr->pel_len; @@ -8177,22 +8765,9 @@ done: * Attempts to flush a protected entry will result in an * error. * - * *first_flush_ptr should be true if only one - * flush is contemplated before the next load, or if this - * is the first of a sequence of flushes that will be - * completed before the next load. *first_flush_ptr is set - * to false if a flush actually takes place, and should be - * left false until the end of the sequence. - * - * The primary_dxpl_id is used if *first_flush_ptr is TRUE - * on entry, and a flush actually takes place. The - * secondary_dxpl_id is used in any subsequent flush where - * *first_flush_ptr is FALSE on entry. - * * If the H5C__FLUSH_INVALIDATE_FLAG flag is set, the entry will - * be cleared and not flushed -- in the case *first_flush_ptr, - * primary_dxpl_id, and secondary_dxpl_id are all irrelevent, - * and the call can't be part of a sequence of flushes. + * be cleared and not flushed, and the call can't be part of a + * sequence of flushes. * * If the caller knows the address of the skip list node at * which the target entry resides, it can avoid a lookup @@ -8209,26 +8784,57 @@ done: * * Programmer: John Mainzer, 5/5/04 * + * Changes: Refactored function to remove the type_ptr parameter. + * + * JRM -- 8/7/14 + * + * Added code to check for slist changes in pre_serialize and + * serialize calls, and set + * cache_ptr->slist_change_in_pre_serialize and + * cache_ptr->slist_change_in_serialize as appropriate. + * + * JRM -- 12/13/14 + * + * Refactored function to delay all modifications of the + * metadata cache data structures until after any calls + * to the pre-serialize or serialize callbacks. + * + * Need to do this, as some pre-serialize or serialize + * calls result in calls to the metadata cache and + * modifications to its data structures. Thus, at the + * time of any such call, the target entry flags and + * the metadata cache must all be consistant. + * + * Also added the entry_size_change_ptr parameter, which + * allows the function to report back any change in the size + * of the entry during the flush. Such size changes may + * occur during the pre-serialize callback. + * + * JRM -- 12/24/14 + * *------------------------------------------------------------------------- */ static herr_t -H5C_flush_single_entry(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, - const H5C_class_t * type_ptr, +H5C_flush_single_entry(const H5F_t * f, + hid_t dxpl_id, haddr_t addr, unsigned flags, - hbool_t * first_flush_ptr, - hbool_t del_entry_from_slist_on_destroy) + hbool_t del_entry_from_slist_on_destroy, + int64_t * entry_size_change_ptr) { H5C_t * cache_ptr = f->shared->cache; hbool_t destroy; /* external flag */ hbool_t clear_only; /* external flag */ + hbool_t free_file_space; /* external flag */ hbool_t take_ownership; /* external flag */ + hbool_t write_entry; /* internal flag */ + hbool_t destroy_entry; /* internal flag */ hbool_t was_dirty; - hbool_t destroy_entry; herr_t status; - unsigned flush_flags = H5C_CALLBACK__NO_FLAGS_SET; + haddr_t new_addr = HADDR_UNDEF; + haddr_t old_addr = HADDR_UNDEF; + size_t new_len = 0; + size_t new_compressed_len = 0; H5C_cache_entry_t * entry_ptr = NULL; herr_t ret_value = SUCCEED; /* Return value */ @@ -8238,11 +8844,15 @@ H5C_flush_single_entry(H5F_t * f, HDassert( cache_ptr ); HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC ); HDassert( H5F_addr_defined(addr) ); - HDassert( first_flush_ptr ); + + /* If defined, initialize *entry_size_change_ptr to 0 */ + if(entry_size_change_ptr != NULL) + *entry_size_change_ptr = 0; /* setup external flags from the flags parameter */ destroy = ((flags & H5C__FLUSH_INVALIDATE_FLAG) != 0); clear_only = ((flags & H5C__FLUSH_CLEAR_ONLY_FLAG) != 0); + free_file_space = ((flags & H5C__FREE_FILE_SPACE_FLAG) != 0); take_ownership = ((flags & H5C__TAKE_OWNERSHIP_FLAG) != 0); /* Set the flag for destroying the entry, based on the 'take ownership' @@ -8256,6 +8866,14 @@ H5C_flush_single_entry(H5F_t * f, /* attempt to find the target entry in the hash table */ H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, FAIL) + /* we will write the entry to disk if it exists, is dirty, and if the + * clear only flag is not set. + */ + if ( ( entry_ptr != NULL ) && ( entry_ptr->is_dirty ) && ( ! clear_only ) ) + write_entry = TRUE; + else + write_entry = FALSE; + /* run initial sanity checks */ #if H5C_DO_SANITY_CHECKS if ( entry_ptr != NULL ) { @@ -8264,6 +8882,8 @@ H5C_flush_single_entry(H5F_t * f, if ( entry_ptr->in_slist ) { + HDassert(entry_ptr->is_dirty); + if ( ( ( entry_ptr->flush_marker ) && ( ! entry_ptr->is_dirty ) ) || ( entry_ptr->addr != addr ) ) { @@ -8272,6 +8892,10 @@ H5C_flush_single_entry(H5F_t * f, } } else { + HDassert(!entry_ptr->is_dirty); + HDassert(!entry_ptr->flush_marker); + HDassert(entry_ptr->addr == addr); + if ( ( entry_ptr->is_dirty ) || ( entry_ptr->flush_marker ) || ( entry_ptr->addr != addr ) ) { @@ -8285,22 +8909,32 @@ H5C_flush_single_entry(H5F_t * f, if ( ( entry_ptr != NULL ) && ( entry_ptr->is_protected ) ) { + HDassert(!entry_ptr->is_protected); /* Attempt to flush a protected entry -- scream and die. */ HGOTO_ERROR(H5E_CACHE, H5E_PROTECT, FAIL, \ "Attempt to flush a protected entry.") } - if ( ( entry_ptr != NULL ) && - ( ( type_ptr == NULL ) || ( type_ptr->id == entry_ptr->type->id ) ) ) + /* if the entry exists, set entry_ptr->flush_in_progress = TRUE + * and set entry_ptr->flush_marker = FALSE + * + * in the parallel case, do some sanity checking in passing. + */ + if ( entry_ptr != NULL ) { /* we have work to do */ + HDassert(entry_ptr->type); + + was_dirty = entry_ptr->is_dirty; /* needed later for logging */ /* We will set flush_in_progress back to FALSE at the end if the * entry still exists at that point. */ entry_ptr->flush_in_progress = TRUE; + entry_ptr->flush_marker = FALSE; + #ifdef H5_HAVE_PARALLEL #ifndef NDEBUG /* If MPI based VFD is used, do special parallel I/O sanity checks. @@ -8314,7 +8948,7 @@ H5C_flush_single_entry(H5F_t * f, unsigned coll_meta; /* Collective metadata write flag */ /* Get the dataset transfer property list */ - if(NULL == (dxpl = H5I_object(primary_dxpl_id))) + if(NULL == (dxpl = H5I_object(dxpl_id))) HGOTO_ERROR(H5E_CACHE, H5E_BADTYPE, FAIL, "not a dataset transfer property list") /* Get the collective metadata write property */ @@ -8326,273 +8960,644 @@ H5C_flush_single_entry(H5F_t * f, } /* end if */ #endif /* NDEBUG */ #endif /* H5_HAVE_PARALLEL */ + } - was_dirty = entry_ptr->is_dirty; - - entry_ptr->flush_marker = FALSE; - - if ( clear_only ) { - H5C__UPDATE_STATS_FOR_CLEAR(cache_ptr, entry_ptr) - } else { - H5C__UPDATE_STATS_FOR_FLUSH(cache_ptr, entry_ptr) - } - - if ( destroy ) { - H5C__UPDATE_STATS_FOR_EVICTION(cache_ptr, entry_ptr) - } + if ( ( entry_ptr != NULL ) && ( write_entry ) ) + { + /* serialize the entry if necessary, and then write it to disk. */ - /* If the entry's type has a 'notify' callback and the entry is about - * to be removed from the cache, send a 'before eviction' notice while - * the entry is still fully integrated in the cache. - */ - if(destroy) { - if(entry_ptr->type->notify && - (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_BEFORE_EVICT, entry_ptr) < 0) - HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, "can't notify client about entry to evict") - } /* end if */ + unsigned serialize_flags = H5C__SERIALIZE_NO_FLAGS_SET; - /* Always remove the entry from the hash table on a destroy. On a - * flush with destroy, it is cheaper to discard the skip list all at - * once rather than remove the entries one by one, so we only delete - * from the slist only if requested. + /* The entry is dirty, and we are doing either a flush, + * or a flush destroy. In either case, serialize the + * entry and write it to disk. * - * We must do deletions now as the callback routines will free the - * entry if destroy is true. + * Note that this may cause the entry to be re-sized and/or + * moved in the cache. * - * Note that it is possible that the entry will be moved during - * its call to flush. This will upset H5C_move_entry() if we - * don't tell it that it doesn't have to worry about updating the - * index and SLIST. Use the destroy_in_progress field for this - * purpose. + * As we will not update the metadata cache's data structures + * until we we finish the write, we must touch up these + * data structures for size and location changes even if we + * are about to delete the entry from the cache (i.e. on a + * flush destroy). */ - if ( destroy ) { - entry_ptr->destroy_in_progress = TRUE; + HDassert(entry_ptr->is_dirty); - H5C__DELETE_FROM_INDEX(cache_ptr, entry_ptr) +#if H5C_DO_SANITY_CHECKS + if ( ( cache_ptr->check_write_permitted == NULL ) && + ( !(cache_ptr->write_permitted) ) ) - if ( ( entry_ptr->in_slist ) && - ( del_entry_from_slist_on_destroy ) ) { + HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \ + "Write when writes are always forbidden!?!?!") +#endif /* H5C_DO_SANITY_CHECKS */ - H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr) + if ( NULL == entry_ptr->image_ptr ) + { + size_t image_size; + + if ( entry_ptr->compressed ) + image_size = entry_ptr->compressed_size; + else + image_size = entry_ptr->size; + + HDassert(image_size > 0); + + entry_ptr->image_ptr = + H5MM_malloc(image_size + H5C_IMAGE_EXTRA_SPACE); + + if ( NULL == entry_ptr->image_ptr) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, \ + "memory allocation failed for on disk image buffer") } - } +#if H5C_DO_MEMORY_SANITY_CHECKS - /* Update the replacement policy for the flush or eviction. - * Again, do this now so we don't have to reference freed - * memory in the destroy case. - */ - if ( destroy ) { /* AKA eviction */ + HDmemcpy(((uint8_t *)entry_ptr->image_ptr) + image_size, + H5C_IMAGE_SANITY_VALUE, H5C_IMAGE_EXTRA_SPACE); - H5C__UPDATE_RP_FOR_EVICTION(cache_ptr, entry_ptr, FAIL) +#endif /* H5C_DO_MEMORY_SANITY_CHECKS */ - } else { + } /* end if */ - H5C__UPDATE_RP_FOR_FLUSH(cache_ptr, entry_ptr, FAIL) - } + if ( ! (entry_ptr->image_up_to_date) ) + { + /* reset cache_ptr->slist_changed so we can detect slist + * modifications in the pre_serialize call. + */ + cache_ptr->slist_changed = FALSE; + + /* make note of the entry's current address */ + old_addr = entry_ptr->addr; + + /* Call client's pre-serialize callback, if there's one */ + if ( ( entry_ptr->type->pre_serialize != NULL ) && + ( (entry_ptr->type->pre_serialize)(f, dxpl_id, + (void *)entry_ptr, + entry_ptr->addr, + entry_ptr->size, + entry_ptr->compressed_size, + &new_addr, &new_len, + &new_compressed_len, + &serialize_flags) < 0 ) ) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ + "unable to pre-serialize entry") + } - /* Clear the dirty flag only, if requested */ - if ( clear_only ) { + /* set cache_ptr->slist_change_in_pre_serialize if the + * slist was modified. + */ + if ( cache_ptr->slist_changed ) + cache_ptr->slist_change_in_pre_serialize = TRUE; - if ( destroy ) { -#ifndef NDEBUG - /* we are about to call the clear callback with the - * destroy flag set -- this will result in *entry_ptr - * being freed. Set the magic field to bad magic - * so we can detect a freed cache entry if we see - * one. + /* Check for any flags set in the pre-serialize callback */ + if ( serialize_flags != H5C__SERIALIZE_NO_FLAGS_SET ) + { + /* Check for unexpected flags from serialize callback */ + if ( serialize_flags & ~(H5C__SERIALIZE_RESIZED_FLAG | + H5C__SERIALIZE_MOVED_FLAG | + H5C__SERIALIZE_COMPRESSED_FLAG)) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ + "unknown serialize flag(s)") + } +#ifdef H5_HAVE_PARALLEL + /* In the parallel case, resizes and moves in + * the serialize operation can cause problems. + * If they occur, scream and die. + * + * At present, in the parallel case, the aux_ptr + * will only be set if there is more than one + * process. Thus we can use this to detect + * the parallel case. + * + * This works for now, but if we start using the + * aux_ptr for other purposes, we will have to + * change this test accordingly. + * + * NB: While this test detects entryies that attempt + * to resize or move themselves during a flush + * in the parallel case, it will not detect an + * entry that dirties, resizes, and/or moves + * other entries during its flush. + * + * From what Quincey tells me, this test is + * sufficient for now, as any flush routine that + * does the latter will also do the former. + * + * If that ceases to be the case, further + * tests will be necessary. + */ + if ( cache_ptr->aux_ptr != NULL ) + + HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \ + "resize/move in serialize occured in parallel case.") +#endif /* H5_HAVE_PARALLEL */ + + /* Resize the buffer if required */ + if ( ( ( ! entry_ptr->compressed ) && + ( serialize_flags & H5C__SERIALIZE_RESIZED_FLAG ) ) || + ( ( entry_ptr->compressed ) && + ( serialize_flags & H5C__SERIALIZE_COMPRESSED_FLAG ) ) ) + { + size_t new_image_size; + + if ( entry_ptr->compressed ) + new_image_size = new_compressed_len; + else + new_image_size = new_len; + + HDassert(new_image_size > 0); + + /* Release the current image */ + if ( entry_ptr->image_ptr ) + { + entry_ptr->image_ptr = H5MM_xfree(entry_ptr->image_ptr); + } + + /* Allocate a new image buffer */ + entry_ptr->image_ptr = + H5MM_malloc(new_image_size + H5C_IMAGE_EXTRA_SPACE); + + if ( NULL == entry_ptr->image_ptr ) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, \ + "memory allocation failed for on disk image buffer") + } + +#if H5C_DO_MEMORY_SANITY_CHECKS + + HDmemcpy(((uint8_t *)entry_ptr->image_ptr) + new_image_size, + H5C_IMAGE_SANITY_VALUE, + H5C_IMAGE_EXTRA_SPACE); + +#endif /* H5C_DO_MEMORY_SANITY_CHECKS */ + + } /* end if */ + + /* If required, update the entry and the cache data structures + * for a resize. */ - entry_ptr->magic = H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC; -#endif /* NDEBUG */ - entry_ptr->cache_ptr = NULL; - } - /* Call the callback routine to clear all dirty flags for object */ - if ( (entry_ptr->type->clear)(f, entry_ptr, destroy_entry) < 0 ) { + if ( serialize_flags & H5C__SERIALIZE_RESIZED_FLAG ) { + + H5C__UPDATE_STATS_FOR_ENTRY_SIZE_CHANGE(cache_ptr, \ + entry_ptr, new_len) + + /* update the hash table for the size change*/ + H5C__UPDATE_INDEX_FOR_SIZE_CHANGE(cache_ptr, \ + entry_ptr->size, \ + new_len, entry_ptr, \ + !(entry_ptr->is_dirty)); + + /* The entry can't be protected since we are + * in the process of flushing it. Thus we must + * update the replacement policy data + * structures for the size change. The macro + * deals with the pinned case. + */ + H5C__UPDATE_RP_FOR_SIZE_CHANGE(cache_ptr, entry_ptr, new_len); - HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "can't clear entry") - } - } else { + /* as we haven't updated the cache data structures for + * for the flush or flush destroy yet, the entry should + * be in the slist. Thus update it for the size change. + */ + HDassert(entry_ptr->in_slist); + H5C__UPDATE_SLIST_FOR_SIZE_CHANGE(cache_ptr, entry_ptr->size, \ + new_len) + + /* if defined, update *entry_size_change_ptr for the + * change in entry size. + */ + if(entry_size_change_ptr != NULL) + *entry_size_change_ptr = (int64_t)new_len - (int64_t)(entry_ptr->size); + + /* finally, update the entry for its new size */ + entry_ptr->size = new_len; + } /* end if */ + /* If required, udate the entry and the cache data structures + * for a move + */ + if(serialize_flags & H5C__SERIALIZE_MOVED_FLAG) + { #if H5C_DO_SANITY_CHECKS - if ( ( entry_ptr->is_dirty ) && - ( cache_ptr->check_write_permitted == NULL ) && - ( ! (cache_ptr->write_permitted) ) ) + int64_t saved_slist_len_increase; + int64_t saved_slist_size_increase; +#endif /* H5C_DO_SANITY_CHECKS */ - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \ - "Write when writes are always forbidden!?!?!") + H5C__UPDATE_STATS_FOR_MOVE(cache_ptr, entry_ptr) + + if ( entry_ptr->addr == old_addr ) + { + /* we must update cache data structures for the + * change in address. + */ + + /* delete the entry from the hash table and the slist */ + H5C__DELETE_FROM_INDEX(cache_ptr, entry_ptr) + H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr) + + /* update the entry for its new address */ + entry_ptr->addr = new_addr; + + /* and then reinsert in the index and slist */ + H5C__INSERT_IN_INDEX(cache_ptr, entry_ptr, FAIL) + +#if H5C_DO_SANITY_CHECKS + /* save cache_ptr->slist_len_increase and + * cache_ptr->slist_size_increase before the + * reinsertion into the slist, and restore + * them afterwards to avoid skewing our sanity + * checking. + */ + saved_slist_len_increase = cache_ptr->slist_len_increase; + saved_slist_size_increase = cache_ptr->slist_size_increase; #endif /* H5C_DO_SANITY_CHECKS */ - if ( destroy ) { -#ifndef NDEBUG - /* we are about to call the flush callback with the - * destroy flag set -- this will result in *entry_ptr - * being freed. Set the magic field to bad magic - * so we can detect a freed cache entry if we see - * one. - */ - entry_ptr->magic = H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC; -#endif /* NDEBUG */ - entry_ptr->cache_ptr = NULL; - } + H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL) - /* Only block for all the processes on the first piece of metadata - */ +#if H5C_DO_SANITY_CHECKS + cache_ptr->slist_len_increase = saved_slist_len_increase; + cache_ptr->slist_size_increase = saved_slist_size_increase; +#endif /* H5C_DO_SANITY_CHECKS */ + } + else /* move is alread done for us -- just do sanity checks */ + { + HDassert(entry_ptr->addr == new_addr); + } + } /* end if */ - if ( *first_flush_ptr && entry_ptr->is_dirty ) { + if ( serialize_flags & H5C__SERIALIZE_COMPRESSED_FLAG ) { + /* just save the new compressed entry size in + * entry_ptr->compressed_size. We don't need to + * do more, as compressed size is only used for I/O. + */ + HDassert(entry_ptr->compressed); + entry_ptr->compressed_size = new_compressed_len; + } + } /* end if ( serialize_flags != H5C__SERIALIZE_NO_FLAGS_SET ) */ - status = (entry_ptr->type->flush)(f, primary_dxpl_id, destroy_entry, - entry_ptr->addr, entry_ptr, - &flush_flags); - *first_flush_ptr = FALSE; + /* Serialize object into buffer */ + { + size_t image_len; - } else { + if ( entry_ptr->compressed ) + image_len = entry_ptr->compressed_size; + else + image_len = entry_ptr->size; + + /* reset cache_ptr->slist_changed so we can detect slist + * modifications in the serialize call. + */ + cache_ptr->slist_changed = FALSE; + + + if ( entry_ptr->type->serialize(f, entry_ptr->image_ptr, + image_len, + (void *)entry_ptr) < 0 ) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ + "unable to serialize entry") + } - status = (entry_ptr->type->flush)(f, secondary_dxpl_id, - destroy_entry, entry_ptr->addr, - entry_ptr, &flush_flags); + /* set cache_ptr->slist_change_in_serialize if the + * slist was modified. + */ + if ( cache_ptr->slist_changed ) + cache_ptr->slist_change_in_pre_serialize = TRUE; + +#if H5C_DO_MEMORY_SANITY_CHECKS + + HDassert(0 == HDmemcmp(((uint8_t *)entry_ptr->image_ptr) + + image_len, + H5C_IMAGE_SANITY_VALUE, + H5C_IMAGE_EXTRA_SPACE)); + +#endif /* H5C_DO_MEMORY_SANITY_CHECKS */ + + entry_ptr->image_up_to_date = TRUE; } + } /* end if ( ! (entry_ptr->image_up_to_date) ) */ + + /* Finally, write the image to disk. + * + * Note that if either the H5C__CLASS_NO_IO_FLAG or the + * the H5AC__CLASS_SKIP_WRITES flag is set in the + * in the entry's type, we silently skip the write. This + * flag should only be used in test code. + */ + if ( ( ((entry_ptr->type->flags) & H5C__CLASS_NO_IO_FLAG) == 0 ) && + ( ((entry_ptr->type->flags) & H5C__CLASS_SKIP_WRITES) == 0 ) ) + { + /* If compression is not enabled, the size of the entry on + * disk is entry_prt->size. However if entry_ptr->compressed + * is TRUE, the on disk size is entry_ptr->compressed_size. + */ + size_t image_size; - if ( status < 0 ) { + if ( entry_ptr->compressed ) + image_size = entry_ptr->compressed_size; + else + image_size = entry_ptr->size; + if ( ( H5F_block_write(f, entry_ptr->type->mem_type, + entry_ptr->addr, + image_size, dxpl_id, + entry_ptr->image_ptr) < 0 ) ) + { HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ - "unable to flush entry") + "Can't write image to file.") } + } -#ifdef H5_HAVE_PARALLEL - if ( flush_flags != H5C_CALLBACK__NO_FLAGS_SET ) { - - /* In the parallel case, flush operations can - * cause problems. If they occur, scream and - * die. - * - * At present, in the parallel case, the aux_ptr - * will only be set if there is more than one - * process. Thus we can use this to detect - * the parallel case. - * - * This works for now, but if we start using the - * aux_ptr for other purposes, we will have to - * change this test accordingly. - * - * NB: While this test detects entryies that attempt - * to resize or move themselves during a flush - * in the parallel case, it will not detect an - * entry that dirties, resizes, and/or moves - * other entries during its flush. - * - * From what Quincey tells me, this test is - * sufficient for now, as any flush routine that - * does the latter will also do the former. - * - * If that ceases to be the case, further - * tests will be necessary. - */ - if ( cache_ptr->aux_ptr != NULL ) + /* if the entry has a notify callback, notify it that we have + * just flushed the entry. + */ - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \ - "resize/move in serialize occured in parallel case.") + if ( ( entry_ptr->type->notify ) && + ( (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_AFTER_FLUSH, + entry_ptr) < 0 ) ) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, \ + "can't notify client of entry flush") + } + } /* if ( ( entry_ptr != NULL ) && ( write_entry ) ) */ - } -#endif /* H5_HAVE_PARALLEL */ + + /* At this point, all pre-serialize and serialize calls have been + * made if it was appropriate to make them. Similarly, the entry + * has been written to disk if desired. + * + * Thus it is now safe to update the cache data structures for the + * flush. + */ + + if ( entry_ptr != NULL ) + { + /* start by updating the statistics */ + + if ( clear_only ) { + + /* only log a clear if the entry was dirty */ + if ( was_dirty ) { + + H5C__UPDATE_STATS_FOR_CLEAR(cache_ptr, entry_ptr) + } + } else if ( write_entry ) { + + HDassert( was_dirty ); + + /* only log a flush if we actually wrote to disk */ + H5C__UPDATE_STATS_FOR_FLUSH(cache_ptr, entry_ptr) + + } + + if ( destroy ) + { + if ( take_ownership ) + { + HDassert(!destroy_entry); + } + else + { + HDassert(destroy_entry); + } + + H5C__UPDATE_STATS_FOR_EVICTION(cache_ptr, entry_ptr, \ + take_ownership) } - if ( ( ! destroy ) && ( entry_ptr->in_slist ) ) { + /* If the entry's type has a 'notify' callback and the entry is about + * to be removed from the cache, send a 'before eviction' notice while + * the entry is still fully integrated in the cache. + */ + if ( destroy ) { + + if ( ( entry_ptr->type->notify ) && + ( (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_BEFORE_EVICT, + entry_ptr) < 0 ) ) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, \ + "can't notify client about entry to evict") + } + } /* end if */ - H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr) + /* Update the cache internal data structures. */ + if ( destroy ) + { + /* Update the cache internal data structures as appropriate + * for a destroy. Specifically: + * + * 1) Delete it from the index + * + * 2) Delete it from the skip list if requested. + * + * 3) Update the replacement policy for eviction + * + * Finally, if the destroy_entry flag is set, discard the + * entry. + */ + + H5C__DELETE_FROM_INDEX(cache_ptr, entry_ptr) + + if ( ( entry_ptr->in_slist ) && + ( del_entry_from_slist_on_destroy ) ) { + + H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr) + } + + H5C__UPDATE_RP_FOR_EVICTION(cache_ptr, entry_ptr, FAIL) } + else + { + HDassert(clear_only || write_entry); + HDassert(entry_ptr->is_dirty); + HDassert(entry_ptr->in_slist); + + /* We are either doing a flush or a clear. + * + * A clear and a flush are the same from the point of + * view of the replacement policy and the slist. + * Hence no differentiation between them. + * + * JRM -- 7/7/07 + */ + + H5C__UPDATE_RP_FOR_FLUSH(cache_ptr, entry_ptr, FAIL) - if ( ( ! destroy ) && ( was_dirty ) ) { + H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr) + + + /* mark the entry as clean and update the index for + * entry clean. Also, call the clear callback + * if defined. + */ + + entry_ptr->is_dirty = FALSE; H5C__UPDATE_INDEX_FOR_ENTRY_CLEAN(cache_ptr, entry_ptr); + + if ( ( entry_ptr->type->clear != NULL ) && + ( (entry_ptr->type->clear)(f, (void *)entry_ptr, FALSE) ) ) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ + "unable to clear entry") + } } - if ( ! destroy ) { /* i.e. if the entry still exists */ + /* reset the flush_in progress flag */ - HDassert( !(entry_ptr->is_dirty) ); - HDassert( !(entry_ptr->flush_marker) ); - HDassert( !(entry_ptr->in_slist) ); - HDassert( !(entry_ptr->is_protected) ); - HDassert( !(entry_ptr->is_read_only) ); - HDassert( (entry_ptr->ro_ref_count) == 0 ); + entry_ptr->flush_in_progress = FALSE; - if ( (flush_flags & H5C_CALLBACK__SIZE_CHANGED_FLAG) != 0 ) { + } /* end if */ - /* The entry size changed as a result of the flush. - * - * Most likely, the entry was compressed, and the - * new version is of a different size than the old. - * - * In any case, we must update entry and cache size - * accordingly. - */ - size_t new_size; - if ( (entry_ptr->type->size)(f, (void *)entry_ptr, &new_size) - < 0 ) { + /* Internal cache data structures should now be up to date, and + * consistant with the status of the entry. + * + * Now discard the entry if appropriate. + */ + if ( entry_ptr != NULL ) + { + if ( destroy ) + { + /* start by freeing the buffer for the on disk image */ + if(entry_ptr->image_ptr != NULL) + entry_ptr->image_ptr = H5MM_xfree(entry_ptr->image_ptr); + + /* Check whether we should free the space in the file that + * the entry occupies + */ + if ( free_file_space ) + { + + size_t fsf_size; + + /* Sanity checks */ + HDassert(H5F_addr_defined(entry_ptr->addr)); + HDassert(!H5F_IS_TMP_ADDR(f, entry_ptr->addr)); +#ifndef NDEBUG +{ + hbool_t curr_compressed = FALSE; + size_t curr_len; + size_t curr_compressed_len = 0; + + /* Get the actual image size for the thing again */ + entry_ptr->type->image_len((void *)entry_ptr, &curr_len, &curr_compressed, &curr_compressed_len); + HDassert(curr_len == entry_ptr->size); + HDassert(curr_compressed == entry_ptr->compressed); + HDassert(curr_compressed_len == entry_ptr->compressed_size); +} +#endif /* NDEBUG */ - HGOTO_ERROR(H5E_RESOURCE, H5E_CANTGETSIZE, FAIL, \ - "Can't get entry size after flush") + /* if the file space free size callback is defined, use + * it to get the size of the block of file space to free. + * Otherwise use entry_ptr->compressed_size if + * entry_ptr->compressed == TRUE, and entry_ptr->size + * if entry_ptr->compressed == FALSE. + */ + if ( entry_ptr->type->fsf_size ) + { + if ( (entry_ptr->type->fsf_size)((void *)entry_ptr, + &fsf_size) < 0 ) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTFREE, FAIL, \ + "unable to get file space free size") + } + } + else if ( entry_ptr->compressed ) /* use compressed size */ + { + fsf_size = entry_ptr->compressed_size; + } + else /* no file space free size callback -- use entry size */ + { + fsf_size = entry_ptr->size; } - if ( new_size != entry_ptr->size ) { + /* Release the space on disk */ + if ( H5MF_xfree(f, entry_ptr->type->mem_type, dxpl_id, + entry_ptr->addr, (hsize_t)fsf_size) < 0) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTFREE, FAIL, \ + "unable to free file space for cache entry") + } + } /* end if ( free_file_space ) */ - HDassert( entry_ptr->size < H5C_MAX_ENTRY_SIZE ); - /* update the hash table for the size change - * We pass TRUE as the was_clean parameter, as we - * have already updated the clean and dirty index - * size fields for the fact that the entry has - * been flushed. (See above call to - * H5C__UPDATE_INDEX_FOR_ENTRY_CLEAN()). - */ - H5C__UPDATE_INDEX_FOR_SIZE_CHANGE((cache_ptr), \ - (entry_ptr->size), \ - (new_size), \ - (entry_ptr), \ - (TRUE)) - - /* The entry can't be protected since we just flushed it. - * Thus we must update the replacement policy data - * structures for the size change. The macro deals - * with the pinned case. - */ - H5C__UPDATE_RP_FOR_SIZE_CHANGE(cache_ptr, entry_ptr, \ - new_size) + /* Reset the pointer to the cache the entry is within. -QAK */ + entry_ptr->cache_ptr = NULL; - /* The entry can't be in the slist, so no need to update - * the slist for the size change. - */ + /* increment entries_removed_counter and set + * last_entry_removed_ptr. As we are likely abuut to + * free the entry, recall that last_entry_removed_ptr + * must NEVER be dereferenced. + * + * Recall that these fields are maintained to allow functions + * that perform scans of lists of entries to detect the + * unexpected removal of entries (via expunge, eviction, + * or take ownership at present), so that they can re-start + * their scans if necessary. + */ + cache_ptr->last_entry_removed_ptr++; + cache_ptr->last_entry_removed_ptr = entry_ptr; - /* update stats for the size change */ - H5C__UPDATE_STATS_FOR_ENTRY_SIZE_CHANGE(cache_ptr, \ - entry_ptr, \ - new_size) + /* Check for actually destroying the entry in memory */ + /* (As opposed to taking ownership of it) */ + if ( destroy_entry ) + { + /* if the entry is dirty and it has a clear callback, + * call this callback now. Since this callback exists, + * it follows tht the client maintains its own dirty bits, + * which must be cleared before the entry is freed to avoid + * sanity check failures. Also clear the dirty flag for + * the same reason. + */ - /* finally, update the entry size proper */ - entry_ptr->size = new_size; - } - } + if ( entry_ptr->is_dirty ) { - if ( (flush_flags & H5C_CALLBACK__MOVED_FLAG) != 0 ) { - - /* The entry was moved as the result of the flush. - * - * Most likely, the entry was compressed, and the - * new version is larger than the old and thus had - * to be relocated. - * - * At preset, all processing for this case is - * handled elsewhere. But lets keep the if statement - * around just in case. - */ + entry_ptr->is_dirty = FALSE; - } + if ( ( entry_ptr->type->clear != NULL ) && + ( (entry_ptr->type->clear)(f, (void *)entry_ptr, TRUE) ) ) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ + "unable to clear entry") + } + } + + /* we are about to discard the in core representation -- + * set the magic field to bad magic so we can detect a + * freed entry if we see one. + */ + entry_ptr->magic = H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC; - /* reset the flush_in progress flag */ - entry_ptr->flush_in_progress = FALSE; - } + /* verify that the image has been freed */ + HDassert( entry_ptr->image_ptr == NULL ); + + if ( entry_ptr->type->free_icr((void *)entry_ptr) < 0 ) + { + HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \ + "free_icr callback failed.") + } + } + else + { + HDassert(take_ownership); + + /* client is taking ownership of the entry. + * set bad magic here too so the cache will choke + * unless the entry is re-inserted properly + */ + entry_ptr->magic = H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC; + } + } /* if ( destroy ) */ + } + + if ( entry_ptr != NULL ) + { if ( cache_ptr->log_flush ) { status = (cache_ptr->log_flush)(cache_ptr, addr, was_dirty, flags); @@ -8606,8 +9611,14 @@ H5C_flush_single_entry(H5F_t * f, } done: - HDassert( ( destroy ) || + + HDassert( ( ret_value != SUCCEED ) || ( destroy_entry ) || ( ( entry_ptr ) && ( ! entry_ptr->flush_in_progress ) ) ); + + HDassert( ( ret_value != SUCCEED ) || ( destroy_entry ) || + ( take_ownership ) || + ( ( entry_ptr ) && ( ! entry_ptr->is_dirty ) ) ); + FUNC_LEAVE_NOAPI(ret_value) } /* H5C_flush_single_entry() */ @@ -8637,8 +9648,19 @@ H5C_load_entry(H5F_t * f, haddr_t addr, void * udata) { + hbool_t dirty = FALSE; /* Flag indicating whether thing was dirtied during deserialize */ + hbool_t compressed = FALSE; /* flag indicating whether thing */ + /* will be run through filters on */ + /* on read and write. Usually FALSE */ + /* set to true if appropriate. */ + size_t compressed_size = 0; /* entry compressed size if */ + /* known -- otherwise uncompressed. */ + /* Zero indicates compression not */ + /* enabled. */ + void * image = NULL; /* Buffer for disk image */ void * thing = NULL; /* Pointer to thing loaded */ H5C_cache_entry_t * entry; /* Alias for thing loaded, as cache entry */ + size_t len; /* Size of image in file */ unsigned u; /* Local index variable */ void * ret_value; /* Return value */ @@ -8648,14 +9670,310 @@ H5C_load_entry(H5F_t * f, HDassert(f->shared); HDassert(f->shared->cache); HDassert(type); - HDassert(type->load); - HDassert(type->size); + + /* verify absence of prohibited or unsupported type flag combinations */ + HDassert(!(type->flags & H5C__CLASS_NO_IO_FLAG)); + + /* for now, we do not combine the speculative load and compressed flags */ + HDassert(!((type->flags & H5C__CLASS_SPECULATIVE_LOAD_FLAG) && + (type->flags & H5C__CLASS_COMPRESSED_FLAG))); + + /* Can't see how skip reads could be usefully combined with + * either the speculative read or compressed flags. Hence disallow. + */ + HDassert(!((type->flags & H5C__CLASS_SKIP_READS) && + (type->flags & H5C__CLASS_SPECULATIVE_LOAD_FLAG))); + HDassert(!((type->flags & H5C__CLASS_SKIP_READS) && + (type->flags & H5C__CLASS_COMPRESSED_FLAG))); + HDassert(H5F_addr_defined(addr)); + HDassert(type->get_load_size); + HDassert(type->deserialize); + + /* Call the get_load_size callback, to retrieve the initial + * size of image + */ + if(type->get_load_size(udata, &len) < 0) + HGOTO_ERROR(H5E_CACHE, H5E_CANTGET, NULL, "can't retrieve image size") + + HDassert(len > 0); + + /* Check for possible speculative read off the end of the file */ + if(type->flags & H5C__CLASS_SPECULATIVE_LOAD_FLAG) { + +/* Quincey has added patches for eoa calculations -- leave the original + * code around until we see the effect of these patches. + * JRM -- 1/1/15 + */ +#if 0 /* original code */ /* JRM */ + /* the original version of this code has several problems: + * + * First, the sblock is not available until the sblock + * has been read in, which causes a seg fault. This is + * dealt with easily enough by testing to see if + * f->shared->sblock is NULL, and calling H5FD_get_base_addr() + * to obtain the base addr when it is. + * + * The second issue is more subtle. H5F_get_eoa() calls + * H5FD_get_eoa(). However, this function returns the EOA as + * a relative address -- i.e. relative to the base address. + * This means that the base addr + addr < eoa sanity check will + * fail whenever the super block is not at address 0 when + * reading in the first chunk of the super block. + * + * To address these issues, I have rewritten the code to + * simply verify that the address plus length is less than + * the eoa. I think this is sufficient, but further testing + * should tell me if it isn't. + * JRM -- 8/29/14 + */ + haddr_t eoa; /* End-of-allocation in the file */ + haddr_t base_addr; /* Base address of file data */ + + /* Get the file's end-of-allocation value */ + eoa = H5F_get_eoa(f, type->mem_type); + HDassert(H5F_addr_defined(eoa)); + + /* Get the file's base address */ + if ( f->shared->sblock ) + + base_addr = H5F_BASE_ADDR(f); + + else { /* sblock not loaded yet -- use file driver info */ + + HDassert(f->shared->lf); + base_addr = H5FD_get_base_addr(f->shared->lf); + + } + HDassert(H5F_addr_defined(base_addr)); + + /* Check for bad address in general */ + if((addr + base_addr) > eoa) + HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, \ + "address of object past end of allocation") + + /* Check if the amount of data to read will be past the eoa */ + if((addr + base_addr + len) > eoa) + /* Trim down the length of the metadata */ + len = (size_t)(eoa - (addr + base_addr)); + +#else /* modified code */ /* JRM */ + + haddr_t eoa; /* End-of-allocation in the file */ + H5FD_mem_t cooked_type; + + /* if type == H5FD_MEM_GHEAP, H5F_block_read() forces + * type to H5FD_MEM_DRAW via its call to H5F__accum_read(). + * Thus we do the same for purposes of computing the eoa + * for sanity checks. + */ + cooked_type = + (type->mem_type == H5FD_MEM_GHEAP) ? H5FD_MEM_DRAW : type->mem_type; + + /* Get the file's end-of-allocation value */ + eoa = H5F_get_eoa(f, cooked_type); + + HDassert(H5F_addr_defined(eoa)); + + /* Check for bad address in general */ + if ( H5F_addr_gt(addr, eoa) ) + + HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, \ + "address of object past end of allocation") + + /* Check if the amount of data to read will be past the eoa */ + if( H5F_addr_gt((addr + len), eoa) ) { + + /* Trim down the length of the metadata */ + + /* Note that for some cache clients, this will cause an + * assertion failure. JRM -- 8/29/14 + */ + len = (size_t)(eoa - addr); + } + + if ( len <= 0 ) + HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, \ + "len not positive after adjustment for EOA.") + +#endif /* modified code */ /* JRM */ + } + /* Allocate the buffer for reading the on-disk entry image */ + if(NULL == (image = H5MM_malloc(len + H5C_IMAGE_EXTRA_SPACE))) + + HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, NULL, \ + "memory allocation failed for on disk image buffer.") + +#if H5C_DO_MEMORY_SANITY_CHECKS + HDmemcpy(((uint8_t *)image) + len, H5C_IMAGE_SANITY_VALUE, H5C_IMAGE_EXTRA_SPACE); +#endif /* H5C_DO_MEMORY_SANITY_CHECKS */ + + /* Get the on-disk entry image */ + if ( 0 == (type->flags & H5C__CLASS_SKIP_READS) ) + if(H5F_block_read(f, type->mem_type, addr, len, dxpl_id, image) < 0) + HGOTO_ERROR(H5E_CACHE, H5E_READERROR, NULL, "Can't read image*") + + /* Deserialize the on-disk image into the native memory form */ + if(NULL == (thing = type->deserialize(image, len, udata, &dirty))) + HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "Can't deserialize image") + + /* If the client's cache has an image_len callback, check it */ + if(type->image_len) { + size_t new_len; /* New size of on-disk image */ + + /* set magic and type field in *entry_ptr. While the image_len + * callback shouldn't touch the cache specific fields, it may check + * these fields to ensure that it it has received the expected + * value. + * + * Note that this initialization is repeated below on the off + * chance that we had to re-try the deserialization. + */ + entry = (H5C_cache_entry_t *)thing; + entry->magic = H5C__H5C_CACHE_ENTRY_T_MAGIC; + entry->type = type; + + /* verify that compressed and compressed_len are initialized */ + HDassert(compressed == FALSE); + HDassert(compressed_size == 0); + + /* Get the actual image size for the thing */ + if(type->image_len(thing, &new_len, &compressed, &compressed_size) < 0) + + HGOTO_ERROR(H5E_CACHE, H5E_CANTGET, NULL, \ + "can't retrieve image length") + + if(new_len == 0) + + HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, "image length is 0") + + HDassert(((type->flags & H5C__CLASS_COMPRESSED_FLAG) != 0) || + ((compressed == FALSE) && (compressed_size == 0))); + HDassert((compressed == TRUE) || (compressed_size == 0)); + + if(new_len != len) { + + if(type->flags & H5C__CLASS_COMPRESSED_FLAG) { + + /* if new_len != len, then compression must be + * enabled on the entry. In this case, the image_len + * callback should have set compressed to TRUE, set + * new_len equal to the uncompressed size of the + * entry, and compressed_len equal to the compressed + * size -- which must equal len. + * + * We can't verify the uncompressed size, but we can + * verify the rest with the following assertions. + */ + HDassert(compressed); + HDassert(compressed_size == len); + + /* new_len should contain the uncompressed size. Set len + * equal to new_len, so that the cache will use the + * uncompressed size for purposes of space allocation, etc. + */ + len = new_len; + + } else if (type->flags & H5C__CLASS_SPECULATIVE_LOAD_FLAG) { + + void *new_image; /* Buffer for disk image */ + + /* compressed must be FALSE, and compressed_size + * must be zero. + */ + HDassert(!compressed); + HDassert(compressed_size == 0); + + /* Adjust the size of the image to match new_len */ + if(NULL == (new_image = H5MM_realloc(image, + new_len + H5C_IMAGE_EXTRA_SPACE))) + + HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, NULL, \ + "image null after H5MM_realloc()") + + image = new_image; + +#if H5C_DO_MEMORY_SANITY_CHECKS + + HDmemcpy(((uint8_t *)image) + new_len, + H5C_IMAGE_SANITY_VALUE, H5C_IMAGE_EXTRA_SPACE); + +#endif /* H5C_DO_MEMORY_SANITY_CHECKS */ + + /* If the thing's image needs to be bigger for a speculatively + * loaded thing, free the thing and retry with new length + */ + if (new_len > len) { + + /* Release previous (possibly partially initialized) + * thing. Note that we must set entry->magic to + * H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC and set one or + * two other fields before the call to free_icr + * so as to avoid sanity check failures. + */ + entry->magic = H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC; + + entry->addr = addr; + + if ( type->free_icr(thing) < 0 ) + + HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, NULL, \ + "free_icr callback failed") + + /* Go get the on-disk image again */ + if(H5F_block_read(f, type->mem_type, addr, + new_len, dxpl_id, image) < 0) + + HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, \ + "Can't read image") + + /* Deserialize on-disk image into native memory + * form again + */ + if(NULL == (thing = type->deserialize(image, new_len, + udata, &dirty))) - if(NULL == (thing = (type->load)(f, dxpl_id, addr, udata))) + HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, \ + "Can't deserialize image") - HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "unable to load entry") +#ifndef NDEBUG + { + /* new_compressed and new_compressed_size must be + * initialize to FALSE / 0 respectively, as clients + * that don't use compression may ignore these two + * parameters. + */ + hbool_t new_compressed = FALSE; + size_t new_compressed_size = 0; + size_t new_new_len; + + /* Get the actual image size for the thing again. Note + * that since this is a new thing, we have to set + * the magic and type fields again so as to avoid + * failing sanity checks. + */ + entry = (H5C_cache_entry_t *)thing; + entry->magic = H5C__H5C_CACHE_ENTRY_T_MAGIC; + entry->type = type; + + type->image_len(thing, &new_new_len, &new_compressed, &new_compressed_size); + HDassert(new_new_len == new_len); + HDassert(!new_compressed); + HDassert(new_compressed_size == 0); + } +#endif /* NDEBUG */ + } /* end if (new_len > len) */ + + /* Retain adjusted size */ + len = new_len; + } else { /* throw an error */ + + HGOTO_ERROR(H5E_CACHE, H5E_UNSUPPORTED, NULL, \ + "size of non-speculative, non-compressed object changed") + } + } /* end if (new_len != len) */ + } /* end if */ entry = (H5C_cache_entry_t *)thing; @@ -8663,35 +9981,39 @@ H5C_load_entry(H5F_t * f, * * However, when this code is used in the metadata cache, it is * possible that object headers will be dirty at this point, as - * the load function will alter object headers if necessary to + * the deserialize function will alter object headers if necessary to * fix an old bug. * - * To support this bug fix, I have replace the old assert: - * - * HDassert( entry->is_dirty == FALSE ); - * - * with: + * In the following assert: * - * HDassert( ( entry->is_dirty == FALSE ) || ( type->id == 5 ) ); + * HDassert( ( dirty == FALSE ) || ( type->id == 5 || type->id == 6 ) ); * - * Note that type id 5 is associated with object headers in the metadata - * cache. + * note that type ids 5 & 6 are associated with object headers in the + * metadata cache. * * When we get to using H5C for other purposes, we may wish to * tighten up the assert so that the loophole only applies to the * metadata cache. */ - HDassert( ( entry->is_dirty == FALSE ) || ( type->id == 5 ) ); -#ifndef NDEBUG + HDassert( ( dirty == FALSE ) || ( type->id == 5 || type->id == 6) ); + entry->magic = H5C__H5C_CACHE_ENTRY_T_MAGIC; -#endif /* NDEBUG */ entry->cache_ptr = f->shared->cache; entry->addr = addr; + entry->size = len; + HDassert(entry->size < H5C_MAX_ENTRY_SIZE); + entry->compressed = compressed; + entry->compressed_size = compressed_size; + entry->image_ptr = image; + entry->image_up_to_date = TRUE; entry->type = type; + entry->is_dirty = dirty; + entry->dirtied = FALSE; entry->is_protected = FALSE; entry->is_read_only = FALSE; entry->ro_ref_count = 0; + entry->is_pinned = FALSE; entry->in_slist = FALSE; entry->flush_marker = FALSE; #ifdef H5_HAVE_PARALLEL @@ -8700,13 +10022,6 @@ H5C_load_entry(H5F_t * f, #endif /* H5_HAVE_PARALLEL */ entry->flush_in_progress = FALSE; entry->destroy_in_progress = FALSE; - entry->free_file_space_on_destroy = FALSE; - - if((type->size)(f, thing, &(entry->size)) < 0) - - HGOTO_ERROR(H5E_RESOURCE, H5E_CANTGETSIZE, NULL, "Can't get size of thing") - - HDassert( entry->size < H5C_MAX_ENTRY_SIZE ); /* Initialize flush dependency height fields */ entry->flush_dep_parent = NULL; @@ -8727,6 +10042,18 @@ H5C_load_entry(H5F_t * f, ret_value = thing; done: + /* Cleanup on error */ + if(NULL == ret_value) { + + /* Release resources */ + if ( thing && type->free_icr(thing) < 0 ) + + HDONE_ERROR(H5E_CACHE, H5E_CANTFLUSH, NULL, \ + "free_icr callback failed") + + if(image) + image = H5MM_xfree(image); + } /* end if */ FUNC_LEAVE_NOAPI(ret_value) } /* H5C_load_entry() */ @@ -8765,36 +10092,45 @@ done: * * Programmer: John Mainzer, 5/14/04 * - * JRM -- 11/13/08 - * Modified function to always observe the min_clean_size - * whether we are maintaining the clean and dirt LRU lists - * or not. To do this, we had to add the new clean_index_size - * and dirty_index_size fields to H5C_t, and supporting code - * as needed throughout the cache. + * Changes: Modified function to skip over entries with the + * flush_in_progress flag set. If this is not done, + * an infinite recursion is possible if the cache is + * full, and the pre-serialize or serialize routine + * attempts to load another entry. * - * The purpose of this modification is to avoid "metadata - * blizzards" in the write only case. In such instances, - * the cache was allowed to fill with dirty metadata. When - * we finally needed to evict an entry to make space, we had - * to flush out a whole cache full of metadata -- which has - * interesting performance effects. We hope to avoid (or - * perhaps more accurately hide) this effect by maintaining - * the min_clean_size, which should force us to start flushing - * entries long before we actually have to evict something - * to make space. + * This error was exposed by a re-factor of the + * H5C_flush_single_entry() routine. However, it was + * a potential bug from the moment that entries were + * allowed to load other entries on flush. + * + * In passing, note that the primary and secondary dxpls + * mentioned in the comment above have been replaced by + * a single dxpl at some point, and thus the discussion + * above is somewhat obsolete. Date of this change is + * unkown. + * + * JRM -- 12/26/14 + * + * Modified function to detect deletions of entries + * during a scan of the LRU, and where appropriate, + * restart the scan to avoid proceeding with a next + * entry that is no longer in the cache. + * + * Note the absence of checks after flushes of clean + * entries. As a second entry can only be removed by + * by a call to the pre_serialize or serialize callback + * of the first, and as these callbacks will not be called + * on clean entries, no checks are needed. + * + * JRM -- 4/6/15 * - * MAM -- 01/06/09 - * Added code to maintain clean_entries_skipped and total_entries - * scanned statistics. *------------------------------------------------------------------------- */ static herr_t H5C_make_space_in_cache(H5F_t * f, - hid_t primary_dxpl_id, - hid_t secondary_dxpl_id, + hid_t dxpl_id, size_t space_needed, - hbool_t write_permitted, - hbool_t * first_flush_ptr) + hbool_t write_permitted) { H5C_t * cache_ptr = f->shared->cache; herr_t result; @@ -8807,6 +10143,7 @@ H5C_make_space_in_cache(H5F_t * f, size_t empty_space; hbool_t prev_is_dirty = FALSE; hbool_t didnt_flush_entry = FALSE; + hbool_t restart_scan; H5C_cache_entry_t * entry_ptr; H5C_cache_entry_t * prev_ptr; H5C_cache_entry_t * next_ptr; @@ -8817,13 +10154,12 @@ H5C_make_space_in_cache(H5F_t * f, HDassert( f ); HDassert( cache_ptr ); HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC ); - HDassert( first_flush_ptr != NULL ); - HDassert( ( *first_flush_ptr == TRUE ) || ( *first_flush_ptr == FALSE ) ); HDassert( cache_ptr->index_size == (cache_ptr->clean_index_size + cache_ptr->dirty_index_size) ); if ( write_permitted ) { + restart_scan = FALSE; initial_list_len = cache_ptr->LRU_list_len; entry_ptr = cache_ptr->LRU_tail_ptr; @@ -8854,6 +10190,7 @@ H5C_make_space_in_cache(H5F_t * f, ( entry_ptr != NULL ) ) { + HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC); HDassert( ! (entry_ptr->is_protected) ); HDassert( ! (entry_ptr->is_read_only) ); HDassert( (entry_ptr->ro_ref_count) == 0 ); @@ -8866,7 +10203,8 @@ H5C_make_space_in_cache(H5F_t * f, prev_is_dirty = prev_ptr->is_dirty; } - if ( (entry_ptr->type)->id != H5C__EPOCH_MARKER_TYPE ) { + if ( ( (entry_ptr->type)->id != H5C__EPOCH_MARKER_TYPE ) && + ( ! entry_ptr->flush_in_progress ) ) { didnt_flush_entry = FALSE; @@ -8881,14 +10219,29 @@ H5C_make_space_in_cache(H5F_t * f, } #endif /* H5C_COLLECT_CACHE_STATS */ + /* reset entries_removed_counter and + * last_entry_removed_ptr prior to the call to + * H5C_flush_single_entry() so that we can spot + * unexpected removals of entries from the cache, + * and set the restart_scan flag if proceeding + * would be likely to cause us to scan an entry + * that is no longer in the cache. + */ + cache_ptr->entries_removed_counter = 0; + cache_ptr->last_entry_removed_ptr = NULL; + result = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - entry_ptr->type, + dxpl_id, entry_ptr->addr, H5C__NO_FLAGS_SET, - first_flush_ptr, - FALSE); + FALSE, + NULL); + + if ( ( cache_ptr->entries_removed_counter > 1 ) || + ( cache_ptr->last_entry_removed_ptr == prev_ptr ) ) + + restart_scan = TRUE; + } else if ( (cache_ptr->index_size + space_needed) > cache_ptr->max_cache_size ) { @@ -8897,13 +10250,12 @@ H5C_make_space_in_cache(H5F_t * f, #endif /* H5C_COLLECT_CACHE_STATS */ result = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - entry_ptr->type, + dxpl_id, entry_ptr->addr, H5C__FLUSH_INVALIDATE_FLAG, - first_flush_ptr, - TRUE); + TRUE, + NULL); + } else { /* We have enough space so don't flush clean entry. @@ -8924,7 +10276,8 @@ H5C_make_space_in_cache(H5F_t * f, } else { - /* Skip epoch markers. Set result to SUCCEED to avoid + /* Skip epoch markers and entries that are in the process + * of being flushed. Set result to SUCCEED to avoid * triggering the error code below. */ didnt_flush_entry = TRUE; @@ -8938,26 +10291,20 @@ H5C_make_space_in_cache(H5F_t * f, } if ( prev_ptr != NULL ) { -#ifndef NDEBUG - if ( prev_ptr->magic != H5C__H5C_CACHE_ENTRY_T_MAGIC ) { - - /* something horrible has happened to *prev_ptr -- - * scream and die. - */ - HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \ - "*prev_ptr corrupt 1") - } -#endif /* NDEBUG */ if ( didnt_flush_entry ) { - /* epoch markers don't get flushed, so the sanity checks - * on normal entries will fail -- thus just set entry_ptr - * to prev_ptr and go on. + /* epoch markers don't get flushed, and we don't touch + * entries that are in the process of being flushed. + * Hence no need for sanity checks, as we haven't + * flushed anything. Thus just set entry_ptr to prev_ptr + * and go on. */ entry_ptr = prev_ptr; - } else if ( ( prev_ptr->is_dirty != prev_is_dirty ) + } else if ( ( restart_scan ) + || + ( prev_ptr->is_dirty != prev_is_dirty ) || ( prev_ptr->next != next_ptr ) || @@ -8968,7 +10315,9 @@ H5C_make_space_in_cache(H5F_t * f, /* something has happened to the LRU -- start over * from the tail. */ + restart_scan = FALSE; entry_ptr = cache_ptr->LRU_tail_ptr; + H5C__UPDATE_STATS_FOR_LRU_SCAN_RESTART(cache_ptr) } else { @@ -9056,13 +10405,11 @@ H5C_make_space_in_cache(H5F_t * f, prev_ptr = entry_ptr->aux_prev; result = H5C_flush_single_entry(f, - primary_dxpl_id, - secondary_dxpl_id, - entry_ptr->type, + dxpl_id, entry_ptr->addr, H5C__FLUSH_INVALIDATE_FLAG, - first_flush_ptr, - TRUE); + TRUE, + NULL); if ( result < 0 ) { @@ -9070,6 +10417,12 @@ H5C_make_space_in_cache(H5F_t * f, "unable to flush entry") } + /* we are scanning the clean LRU, so the serialize function + * will not be called on any entry -- thus there is no + * concern about the list being modified out from under + * this function. + */ + entry_ptr = prev_ptr; entries_examined++; } @@ -9482,6 +10835,66 @@ done: /*------------------------------------------------------------------------- * + * Function: H5C_entry_in_skip_list + * + * Purpose: Debugging function that scans skip list to see if it + * is in present. We need this, as it is possible for + * an entry to be in the skip list twice. + * + * Return: FALSE if the entry is not in the skip list, and TRUE + * if it is. + * + * Programmer: John Mainzer, 11/1/14 + * + * Changes: + * + * None. + * + *------------------------------------------------------------------------- + */ +#if H5C_DO_SLIST_SANITY_CHECKS + +static hbool_t +H5C_entry_in_skip_list(H5C_t * cache_ptr, H5C_cache_entry_t *target_ptr) +{ + hbool_t in_slist = FALSE; + H5SL_node_t * node_ptr = NULL; + H5C_cache_entry_t * entry_ptr = NULL; + + HDassert( cache_ptr ); + HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC ); + HDassert( cache_ptr->slist_ptr ); + + node_ptr = H5SL_first(cache_ptr->slist_ptr); + + while ( ( node_ptr != NULL ) && ( ! in_slist ) ) + { + entry_ptr = (H5C_cache_entry_t *)H5SL_item(node_ptr); + + HDassert( entry_ptr ); + HDassert( entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC ); + HDassert( entry_ptr->is_dirty ); + HDassert( entry_ptr->in_slist ); + + if ( entry_ptr == target_ptr ) { + + in_slist = TRUE; + + } else { + + node_ptr = H5SL_next(node_ptr); + } + } + + return(in_slist); + +} /* H5C_entry_in_skip_list() */ + +#endif /* H5C_DO_SLIST_SANITY_CHECKS */ + + +/*------------------------------------------------------------------------- + * * Function: H5C_get_entry_ptr_from_addr() * * Purpose: Debugging function that attempts to look up an entry in the @@ -9784,7 +11197,7 @@ done: *------------------------------------------------------------------------- */ static herr_t -H5C_flush_tagged_entries(H5F_t * f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, H5C_t * cache_ptr, haddr_t tag) +H5C_flush_tagged_entries(H5F_t * f, hid_t dxpl_id, H5C_t * cache_ptr, haddr_t tag) { herr_t ret_value = SUCCEED; @@ -9800,7 +11213,7 @@ H5C_flush_tagged_entries(H5F_t * f, hid_t primary_dxpl_id, hid_t secondary_dxpl_ HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "Can't mark tagged entries") /* Flush all marked entries */ - if(H5C_flush_marked_entries(f, primary_dxpl_id, secondary_dxpl_id, cache_ptr) < 0) + if(H5C_flush_marked_entries(f, dxpl_id, cache_ptr) < 0) HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "Can't flush marked entries") done: @@ -9873,7 +11286,7 @@ H5C_mark_tagged_entries(H5C_t * cache_ptr, haddr_t tag) *------------------------------------------------------------------------- */ static herr_t -H5C_flush_marked_entries(H5F_t * f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, H5C_t * cache_ptr) +H5C_flush_marked_entries(H5F_t * f, hid_t dxpl_id, H5C_t * cache_ptr) { herr_t ret_value = SUCCEED; @@ -9885,8 +11298,7 @@ H5C_flush_marked_entries(H5F_t * f, hid_t primary_dxpl_id, hid_t secondary_dxpl_ HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC); /* Flush all marked entries */ - if(H5C_flush_cache(f, primary_dxpl_id, secondary_dxpl_id, - H5C__FLUSH_MARKED_ENTRIES_FLAG | H5C__FLUSH_IGNORE_PROTECTED_FLAG) < 0) + if(H5C_flush_cache(f, dxpl_id, H5C__FLUSH_MARKED_ENTRIES_FLAG | H5C__FLUSH_IGNORE_PROTECTED_FLAG) < 0) HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "Can't flush cache") done: @@ -9929,7 +11341,7 @@ H5C_verify_tag(int id, haddr_t tag) * constraints are met. */ /* Superblock */ - if(id == H5AC_SUPERBLOCK_ID) { + if((id == H5AC_SUPERBLOCK_ID) || (id == H5AC_DRVRINFO_ID)) { if(tag != H5AC__SUPERBLOCK_TAG) HGOTO_ERROR(H5E_CACHE, H5E_CANTTAG, FAIL, "superblock not tagged with H5AC__SUPERBLOCK_TAG") } @@ -10001,10 +11413,9 @@ H5C_retag_copied_metadata(H5C_t * cache_ptr, haddr_t metadata_tag) next_entry_ptr = cache_ptr->index[u]; while(next_entry_ptr != NULL) { - if(cache_ptr->index[u] != NULL) { + if(cache_ptr->index[u] != NULL) if((cache_ptr->index[u])->tag == H5AC__COPIED_TAG) (cache_ptr->index[u])->tag = metadata_tag; - } /* end if */ next_entry_ptr = next_entry_ptr->ht_next; } /* end while */ |