because the level of that page needs to be adjusted separately.

rec_get_nth_field_offs_old(): Split from rec_get_nth_field_old().

rec_get_nth_field_old(): Reimplement as a constness-preserving macro.

dict_drop_index_tree(), dict_truncate_index_tree(): Note that rec is
an in/out parameter, as the B-tree root page number will be updated.

page_get_page_no(page_align(field_ref)) calls with a local variable
rec_page_no = buf_block_get_page_no(rec_block).

#ifdef UNIV_BTR_DEBUG, as it depends on other #ifdef UNIV_BTR_DEBUG code.

Implement dict_index_get_if_in_cache_low() correctly.
Restore the function dict_index_get_if_in_cache() #ifdef UNIV_DEBUG.

buf0lru.c: Always #include "srv0srv.h"

buf_block_get_lock_mutex(), buf_frame_get_lock_mutex(): Remove.

mtr0log.ic: Remove #include "page0page.h" and replace the page_
functions with lower-level ones to break an #include cycle.

dict0dict.ic: Remove unnecessary #include "trx0undo.h" and "trx0sys.h"
that would create an #include cycle.

btr_check_node_ptr(): Replace page_t* parameter with buf_block_t*.

btr_free_externally_stored_field(): Add const qualifier to rec.
Remove an explicit buf_block_align() call, but replace an
mtr_memo_contains() with mtr_memo_contains_page().

row_upd_rec_sys_fields(): Reorder an assertion containing buf_block_align()
so that the costly call can be avoided in some cases.

with rec_t** current_rec.  Reposition *current_rec after calling
page_zip_reorganize().

from the adaptive hash index [btr_search_guess_on_hash() and
btr_search_validate()].  Some references to buf_block_align() remain
in debug builds.

btr_store_big_rec_extern_fields(): Add the parameter rec_block.

page_rec_get_next_low(): Do not assume that the page has been
allocated from the buffer pool when printing the diagnostic information.

page_cur_insert_rec_low(): Replace the parameter page_zip_des_t* page_zip
with the parameter buf_block_t* block.

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.