Compare heap_no against PAGE_HEAP_NO_SUPREMUM instead of
PAGE_NEW_SUPREMUM or PAGE_OLD_SUPREMUM.

Return NULL when trying to use heap->free_block that is NULL.

Replace all page_t* parameters with buf_block_t*, and replace many
rec_t* parameters with heap_no.  This eliminates also many
rec_get_heap_no() calls, which became more expensive with the
introduction of ROW_FORMAT=COMPACT in MySQL/InnoDB 5.0.3.

page_rec_get_heap_no(), lock_get_min_heap_no(): New functions.

Replace buf_frame_t* guess with buf_block_t* guess in order to avoid
a buf_block_align() call.

trx_undo_t: Replace page_t* guess_page with buf_block_t* guess_block.

btr_search_t: Replace page_t* root_guess with buf_block_t* root_guess.

buf_calc_page_new_checksum(), buf_calc_page_old_checksum(),
buf_page_is_corrupted(), buf_page_print():
Add const qualifier to byte* parameter.

page_parse_create_zip(): Remove this declaration of non-existing function.

page_rec_check(), page_rec_print(), row_vers_impl_x_locked_off_kernel():
Add const qualifier to rec_t* parameter.

row_vers_old_has_index_entry(): Add const qualifier to dtuple_t* parameter.

row_sel_sec_rec_is_for_blob(): Add const qualifiers.

Replace some occurrences of mtr_memo_contains_page() with mtr_memo_contains().

After calling row_sel_sec_rec_is_for_blob(), skip the cmp_data_data()
comparison of the incomplete prefix.

page_set_max_trx_id(): Replace page_t* parameter with buf_block_t*,
to avoid a buf_block_align() call.

Replace some occurrences of page_get_page_no() with buf_block_get_page_no().

page_cur_delete_rec(): Replace buf_block_align() with page_cur_get_block().

btr_cur_pessimistic_insert(): Remove local variable "block".  Replace
an extraneous call to btr_cur_position() [with wrong "block", in r948]
with a debug assertion that the cursor is positioned on the preceding
record after the page split.

btr_pcur_restore_position(): Do not use btr_pcur_get_page(), because
the debug assertion there could fail.  This bug was introduced in r928.

parameters of some functions.

buf_block_get_frame(), because it will lead to debug assertion failure
when buf_fix_count == 0.  This bug was introduced in r908.

btr_cur_t: Move page_block to page_cur_t::block.

page_cur_get_block(), page_cur_get_page_zip(): New functions.

page_cur_position(): Add parameter block.

Remove many page_zip parameters, now that there is page_cur_get_page_zip().
Replace some page, page_zip parameters with block.

Add some const qualifiers to function parameters and remove casts.

PAGE_HEAP_NO_INFIMUM, PAGE_HEAP_NO_SUPREMUM, PAGE_HEAP_NO_USER_LOW:
New constants.

Replace some cursor code in low-level diagnostic functions with
direct management of rec, because buf_block_t::buf_fix_count may be 0
when the functions are called, and debug assertions would fail.

because it will lead to debug assertion failure when buf_fix_count == 0.
This bug was introduced in r912.

added in r928.  Do not call btr_cur_get_block() in the debug assertion,
because the debug assertion there would fail.

We cannot call buf_block_get_space() or buf_block_get_page_no(),
because the assertions there can fail.

while trying to fix r909: invoke mem_erase_buf() before freeing the
buffer, but after interpreting block->buf_block.

ibuf_page(), ibuf_page_low(), ibuf_free_excess_pages(), ibuf_insert(),
buf_read_page(), buf_read_ahead_linear(), buf_read_recv_pages():
Add parameter zip_size.

btr_search_build_page_hash_index(), fsp_parse_init_file_page(),
ibuf_parse_bitmap_init(): Replace page_t* with buf_block_t*.

buf_read_ibuf_merge_pages(): Add const qualifiers.  Retrieve zip_size.

ibuf_merge_or_delete_for_page(): Replace page_t* with buf_block_t*.
Add parameter zip_size.

dict_index_get_nth_col_pos(), dict_index_get_sys_col_pos(),
dict_index_get_n_fields(), fil_page_get_type():
Add const qualifier to parameter.

dict_index_get_nth_field(): Implement as a macro unless #ifdef UNIV_DEBUG.

accessors returning pointers with macros that preserve const qualifiers.
In UNIV_DEBUG builds, retain the accessors and cast away constness there.

dfield_get_type(), dfield_get_data(), dtuple_get_nth_field(),
dict_table_get_nth_col(), dict_table_get_sys_col(): Implement as macro
unless #ifdef UNIV_DEBUG.

rec_get_nth_field(): Replace with rec_get_nth_field_offs() that does not
do pointer arithmetics.  Implement rec_get_nth_field() as a macro.

passed as TRUE.

Enclose hash_table_t::adaptive and buf_block_t::n_pointers in
#ifdef UNIV_DEBUG.

btr_search_drop_page_hash_index(): Enclose the corruption check
(which depends on buf_block_t::n_pointers) in #ifdef UNIV_DEBUG.

calling buf_block_align() in btr_pcur_move_backward_from_page().
Also, enclose some assertions about page_is_comp() in #ifdef UNIV_BTR_DEBUG.

Replace page_t* or page_zip_des_t* parameters in some functions with
buf_block_t*.

buf_frame_get_page_zip(): Disable unless #ifdef UNIV_DEBUG || UNIV_ZIP_DEBUG.

btr_cur_t: Add buf_block_t* page_block.

btr_pcur_get_block(), btr_cur_get_block(), btr_cur_get_page_zip():
New functions.

btr_cur_position(): Add the parameter block.

and modify some functions to return const pointers.  Add const qualifiers
to local variable declarations or casts to remove the const qualifier
in those places where write access is needed.

the symbol UNIV_DEBUG_PRINT, which was introduced in r729.

buf_LRU_print(), buf_print(): Replace #ifdef UNIV_DEBUG_PRINT
with #if defined UNIV_DEBUG || defined UNIV_DEBUG_PRINT.

of rec accessor functions.

Trim the fetched prefix with dtype_get_at_most_n_mbchars().

and remove the buf_block_align() call.

Replace buf_frame_modify_clock_inc() with buf_block_modify_clock_inc().
Replace buf_frame_get_lock_hash_val() with buf_block_get_lock_hash_val().
Replace buf_frame_get_lock_mutex() with buf_block_get_lock_mutex().

page_create_zip(), page_create(), page_create_low(), btr_page_free(),
btr_page_free_low(): Replace page_t with buf_block_t.

invoke mem_erase_buf() only after interpreting block->buf_block.

ibuf_update_free_bits_low(), ibuf_update_free_bits_for_two_pages_low(),
ibuf_set_free_bits_low(): Replace page_t with buf_block_t.

ibuf_reset_free_bits(): Remove, as there already is a similar function
ibuf_reset_free_bits_with_type().

ibuf_reset_free_bits_with_type(), ibuf_set_free_bits(),
ibuf_update_free_bits_if_full(), btr_leaf_page_release(),
buf_page_make_young(): Replace page_t with buf_block_t.

btr_compress(): Replace btr_page_get() with btr_block_get().

mlog_write_initial_log_record_fast(): Remove the buf_block_align() call
unless #ifdef UNIV_DEBUG.

btr_cur_update_in_place(): Replace buf_frame_get_page_zip() with
buf_block_get_page_zip().

btr_page_create(), btr_page_empty(): Replace the parameter page with block.

btr_attach_half_pages(): Use btr_block_get() instead of btr_page_get().
Remove buf_block_align() calls.

btr_cur_latch_leaves(): Remove duplicated code.  Use btr_block_get()
instead of btr_page_get().  Remove buf_block_align() calls.

When allocating a block from heap->free_block, set buf_block.

with buf_block_alloc() and buf_block_free(), in order to
avoid buf_block_align() calls.

btr_block_get(): New function to return buf_block_t.

btr_page_alloc(), buf_page_get_release_on_io(), buf_page_get_gen(),
buf_page_create(), fseg_create(), fseg_create_general(): Return buf_block_t.

buf_page_get_known_nowait(): Expect buf_block_t instead of buf_frame_t.

buf_frame_get_newest_modification(): Replace with
buf_block_get_newest_modification().

buf_page_dbg_add_level(): Replace with buf_block_dbg_add_level().

buf_block_get_zip_size(): New function.

buf_block_get_page_zip(): Reintroduce.

recv_recover_page(): Replace page, space, page_no with block.

ibuf_bitmap_page_init(): Replace page, zip_size with block.

ibuf_parse_bitmap_init(): Remove the parameter zip_size.

btr_search_drop_page_hash_index(): Replace page with block.

with page_get_page_no() and page_get_space_id().  We want to avoid
buf_block_align() calls, and the page_no and space_id are now stamped
on the pages early on.

dict_table_add_system_columns() to dict_table_add_to_cache().

buf_flush_init_for_writing(): Remove parameters space, page_no.

fsp_init_file_page_low(): Wriet space_id and page_no to the page.

fil_create_new_single_table_tablespace(): Write space_id to the page.