ut_is_2pow(): New function for testing if a number is zero or a power of two.
Use this function instead of bitwise arithmetics or ut_2_power_up() where
possible.

ut_a(page_zip_validate()) that are enabled if UNIV_DEBUG or
UNIV_ZIP_DEBUG is defined.

mlog_parse_string(): Remove an off-by-one error in an assertion.

fil_extend_space_to_desired_size(): fsp_header_get_free_limit(),
fsp_try_extend_data_file(): Replace UNIV_PAGE_SIZE with the actual page size.

PAGE_ZIP_MIN_SIZE: New constant, to be used in assertions.

FSP_SEG_INODES_PER_PAGE: Add parameter zip_size.

fsp_seg_inode_page_get_nth_inode(), fsp_seg_inode_page_find_used(),
fsp_seg_inode_page_find_free(): Add parameter zip_size.

ibuf_parse_bitmap_init(), ibuf_bitmap_page_init(),
ibuf_bitmap_page_get_bits(), ibuf_bitmap_set_bits(),
ibuf_bitmap_page_no_calc(), ibuf_bitmap_get_map_page(),
xdes_calc_descriptor_page(), xdes_calc_descriptor_index(),
fsp_descr_page(): Add parameter zip_size.

pages occur every zip_size pages in compressed tablespaces, instead of
UNIV_PAGESIZE (or XDES_DESCRIBED_PER_PAGE).

ibuf_bitmap_page(): Add parameter zip_size.

ibuf_fixed_addr_page(): Add parameter space.

os_aio_simulated_handle(): Temporarily disable os_file_check_page_trailers(),
which cannot be invoked on compressed pages.

dict_table_add_system_columns(): New function, split from
dict_table_add_to_cache().

mlog_parse_index(): Add system columns to the dummy table and identify
DB_TRX_ID and DB_ROLL_PTR in the dummy index.

buf_LRU_get_free_block(): Note that page_zip->data should be allocated from
an aligned memory pool.

buf_flush_buffered_writes(): Write compressed pages to disk.

buf_flush_post_to_doublewrite_buf(): Copy compressed pages to the
doublewrite buffer.  Zero fill any excess space.

buf_flush_init_for_writing(): Treat all compressed pages the same.

buf_read_page_low(): Read compressed pages from disk.

buf_page_io_complete(): Process compressed pages.

trx_sys_doublewrite_init_or_restore_page(): Process compressed pages.

mlog_write_initial_log_record_fast(): Enable a debug printout
#ifdef UNIV_LOG_DEBUG.

fsp_header_init(), fsp_fill_free_list(): Pass the compressed page size
to buf_page_create().

page_zip_compress_write_log(): Flatten the if-else if-else logic.

page_zip_parse_write_blob_ptr(): Do not test page_zip if page==NULL.

page_zip_parse_write_node_ptr(): Do not test page_zip if page==NULL.
Invoke mlog_close() correctly.

row_sel_store_row_id_to_prebuilt(): Add UNIV_UNLIKELY hint to an
assertion-like test.

pages.

buf_flush_post_to_doublewrite_buf(): Add a TODO comment about compressed pages.

mach_read_from_4(...) != mach_read_from_4(...) with memcmp(..., ..., 4).

a few places accordingly.

os_aio_simulated_handle(): Add TODO comments about skipping the write
checks for compressed pages.

dict_create_sys_tables_tuple(): Write the compressed page size to
the TYPE column.

open_or_create_data_files(): Simplify the fil_node_create() call.

fil_node_create(): Do not touch space->zip_size.  It was already initialized
by fil_space_create().

fil_reset_too_high_lsns(), buf_flush_buffered_writes(): Add TODO comment
about compressed pages.

buf_flush_init_for_writing(): Handle pages of type FIL_PAGE_INODE,
FIL_PAGE_IBUF_BITMAP, and FIL_PAGE_TYPE_FSP_HDR as uncompressed ones.

page_zip_compress_write_log(): Make static.

page_zip_compress(): Add optional parameter mtr for redo logging.

page_zip_reorganize(): Low-level counterpart of btr_page_reorganize().

page_zip_copy(): Add debug assertions about mtr_memo_contains.

page_cur_insert_rec_low(): Try page_zip_reorganize() and seek to the
new position of insert_rec if it succeeds.

page_copy_rec_list_end(), page_copy_rec_list_start():
Try page_zip_reorganize().

page_move_rec_list_end(): Remove bogus comment.

page_zip_copy(), page_zip_compress_write_log(): Add parameter 'index'.

page_zip_parse_write_header(): Check for !page_zip only if page != NULL.

page_zip_compress_write_log(), page_zip_parse_compress(): Omit some
fields in the page header.  Omit the unused bytes between the modification
log and the page trailer.

parse_or_apply_log_rec_body(): Remove a bogus debug assertion.

page_move_rec_list_start() and page_move_rec_list_end().  Relax the
conditions on insert_will_fit if page_zip is set.

page_delete_rec_list_start(): Make public.

page_zip_copy(): Clear REC_INFO_MIN_REC_FLAG if FIL_PAGE_PREV != FIL_NULL.

set the FIL_PAGE_PREV field of merge_page to FIL_NULL before copying the
records in order not to break the assumption of page_zip_compress() that
min_rec_mark is always set on the first user record of a non-leaf page
whose FIL_PAGE_PREV field is FIL_NULL, and never otherwise.

btr_compress(): Defer any tree modifications until the records
have successfully been copied.

row_purge_remove_sec_if_poss_low(): Simplify the setting of
the return status.

btr_lift_page_up(): If page_copy_rec_list_end() fails, resort to
page_zip_copy().

page_zip_copy(): Validate the copy of the page.

btr_validate_level(): Add missing parameter to added buf_page_print() calls.

btr_root_raise_and_insert(): Replace low-level code with page_zip_copy().

page_zip_copy(): New function to copy the data payload of a compressed page,
byte for byte.  The file page header and trailer are not copied, to avoid
overwriting the fields FIL_PAGE_OFFSET, FIL_PAGE_PREV and FIL_PAGE_NEXT.

btr_cur_compress_if_useful(): Replace if () return(); return() with return.

page_rec_get_next_low(): New function.

page_rec_get_prev(): Invoke page_is_comp() outside the loop.
Replace page_rec_get_next() with loop-specific instances of
page_rec_get_next_low().

page_copy_rec_list_end(): Add some debug assertions.

records have successfully been copied.

make AM_CFLAGS='-std=c89 -Wall -W -pedantic'

btr_root_raise_and_insert(): When copying root to new_page byte for byte,
restore the page number of new_page afterwards.

buf_flush_init_for_writing(): For FIL_PAGE_INDEX, write the page number
and space id also to the uncompressed page.

btr_root_raise_and_insert(): If page_copy_rec_list_end() fails,
copy the pages byte for byte.

page_zip_compress(): Ensure that the uncompressed storage area will
fit on the compressed page.

reorganizing the page fails when compressed pages are enabled.

in CREATE TABLE and ALTER TABLE with AVG_ROW_LENGTH={1,2,4,8,16}.

Introduce FIL_PAGE_ZBLOB_DATA as a synonym for FIL_PAGE_FILE_FLUSH_LSN.

btr_store_big_rec_extern_fields(): Make the assertion about
dict_table_zip_size() more accurate.

buf_LRU_get_free_block(), buf_block_alloc(): Add parameter zip_size.

buf_calc_zblob_page_checksum(): Remove. Replace with page_zip_calc_checksum().

buf_page_init(): Remove parameter zip_size.

buf_page_io_complete(): Add a placeholder for handling compressed pages.

trx_doublewrite_page_inside(): Remove redundant function.

page_zip_write_rec(): Relax an overly tight assertion about blob_no.

buf_page_print(): Print also compressed pages.  Add parameter zip_size.

buf_flush_init_for_writing(): Stamp the fields on a compressed B-tree index
page.

Add the header field FIL_PAGE_ZBLOB_SPACE_ID as an alias of FIL_PAGE_PREV.

page_zip_calc_checksum(): New function.

page_zip_compress(): Avoid copying the fields that are written in
buf_flush_init_for_writing().

page_zip_header_cmp(): New function for comparing those fields of the
page header that will not be written in buf_flush_init_for_writing().

recompressing the page.

buf_flush_init_for_writing(): Calculate the checksum with the actual zip_size.

buf_calc_zblob_page_checksum(): Skip the field FIL_PAGE_SPACE_OR_CHKSUM.

trx_sys_doublewrite_init_or_restore_page(): Use the actual zip_size.

page_cur_insert_rec_low(): If page_zip_alloc() fails, try compressing the
whole page afterwards.

btr_page_reorganize_low(): Rename new_page to temp_page.

btr_store_big_rec_extern_fields(): FIL_PAGE_TYPE is 2 bytes, not 4.

buf_page_init(), buf_page_create(), buf_read_page_low(),
buf_page_init_for_read(): Add parameter zip_size.

buf_page_init_for_backup_restore(),
recv_apply_log_recs_for_backup(): Enclose in #ifdef UNIV_HOTBACKUP.

Enclose some debug code in #ifdef UNIV_LOG_REPLICATE.

page_zip_write_header_log(): Replace page_zip with a pointer to
the uncompressed page.

page_zip_write_rec(): Relax an assertion about blob_no + n_ext.

page_copy_rec_list_to_created_page_write_log(): Allow logging to be disabled.

and to the file space header (FSP_PAGE_ZIP_SIZE, renamed from
FSP_LOWEST_NO_WRITE).

fil_space_struct: Add zip_size.

dict_table_struct: Embed zip_size in flags.

dict_table_zip_size(): Infer zip_size from table->flags.

dict_sys_tables_get_zip_size(): Read zip_size from SYS_TABLES.TYPE.

fil_space_get_zip_size(): Read zip_size from the file space header.

Add the redo log entry type MLOG_ZIP_FILE_CREATE.

page_zip_alloc(): Add parameter "mtr" and log successful calls
to page_zip_compress().

page_zip_write_blob_ptr(), page_zip_write_node_ptr(): Write the offset on
the uncompressed page, because mlog_write_initial_log_record_fast()
does not do so.

page_zip_write_header_log(), page_zip_parse_write_header(): Encode the
offset in one byte.