storage size from 16 to 3 bits.

page_zip_get_size(), page_zip_set_size(): New functions.

Replace direct references to page_zip_des_t:size with calls to
buf_block_get_zip_size(), page_zip_get_size(), and page_zip_set_size().

for log sequence numbers, to replace dulint.

buf_block_get_state().

buf_block_init(), buf_page_init_for_backup_restore(): Assign
block->page.zip.state after invoking page_zip_des_init(&block->page).

introduced in r1057 are of the int type.

which should have been replaced in r1057.

threshold.

and uncompressed buffer pool pages.

buf_block_t: Replace page_zip, space, and offset with buf_page_t page.
Replace some integers with bit-fields.

enum buf_block_state: Rename to buf_page_state.  Add BUF_BLOCK_ZIP_PAGE.

page_zip_des_t: Add the field "state".  Make the integer fields bit-fields.

page_zip_copy(): Document which fields are copied.

buf_block_state_valid(): New macro for replacing the magic_n check

BUF_BLOCK_READY_FOR_USE to BUF_BLOCK_NOT_USED.

buf_block_get_space(), buf_block_get_page_no():
Remove ut_ad(block->buf_fix_count > 0), because since r1052
these functions are also used in low-level code.

buf_block_set_state(): New function.  Also checks the state transitions.

buf_block_set_file_page(): New function.

and block->space with buf_block_get_state(block), buf_block_get_page_no(block),
and buf_block_get_space(block).

enum buf_block_state: Replaces the #define'd buf_block_t.state values.

buf_block_get_state(): New function.

buf_block_get_frame(): Add __attribute__((const)).

buf0buf.ic: Remove the extern declaration of buf_dbg_counter.
It was declared static in buf0buf.c in r1025.

ha0ha.c: #include "btr0sea.h" #ifdef UNIV_SYNC_DEBUG.  Assertions on
btr_search_latch were added in r1041.

buf_pool_page_hash_rebuild(): New function.

hash index, because it might occupy the chunk we would like to free.

TODO: In btr_search_check_free_space_in_heap(), release the block if
btr_search_latch is not immediately available.

buf_pool_shrink(): Split from buf_pool_resize().

btr_search_disabled: New variable, similar to srv_use_adaptive_hash_indexes
that was removed earlier.

btr_search_disable(): New function: disable and purge the adaptive hash index.

btr_search_enable(): New function: enable the adaptive hash index.

ha_clear(): New function: Empty a hash table and free the memory heaps.

function to ha_node_set_data_func().  In this way, the #ifdef in the
callers can be removed.

SHOW MUTEX STATUS in non-debug builds.  (Bug #24386)

assume that non-file pages are free.  After trying to free or flush
file pages, do not proceed to buf_chunk_free(), because the calls will
temporarily release buf_pool->mutex.  Do not flush if there are non-free
blocks, because it would not achieve anything.

enclose buf_validate() and friends in it.

enclose all related debug code in #ifdef UNIV_DEBUG_FILE_ACCESSES.
This should have no effect on the behaviour, as the symbol is
not defined by default.  It only reduces the size of buf_block_t
and removes some assignments and debug functions.

statement that was accidentally checked in in r1022.

record on every compressed BLOB page header, so that compressed BLOBs
can be relocated or the chain of BLOB pages can be validated.

buf_LRU_block_free_non_file_page(): Deallocate block->page_zip.data
to avoid ut_a(!block->page_zip.data) in buf_chunk_free().

buf_chunk_free(): Add the assertion ut_a(!block->in_LRU_list).

buf_pool_resize(): When shrinking the buffer pool and there are
non-free blocks in the candidate chunk, free the clean blocks
and move the dirty blocks to the end of the LRU list and request a flush.
Proceed if the chunk becomes free, and retry otherwise.

buf_LRU_search_and_free_block().

mysql.patch: Patch to change or add variables to MySQL

innodb.patch: Patch to make the master thread poll requests to resize
the buffer pool.

Replace srv_pool_size and innobase_buffer_pool_size
with srv_buf_pool_size, srv_buf_pool_old_size,
and srv_buf_pool_curr_size.

Add buf_chunk_t, a collection of buf_block_t.

when assigning node->data.

ha_delete(), ha_search_and_delete_if_found(), ha_remove_all_nodes_to_page():
Remove the parameter buf_block_t* block, now that it is stored within the
hash data structure in debug builds.

an assertion failure in debug builds when a context switch occurred in
buf_LRU_search_and_free_block() before the call to
btr_search_drop_page_hash_index() managed to acquire the mutexes again.

ha_node_t: Add the field buf_block_t* block.

ha_search_and_update_if_found(): Rename to ha_search_and_update_if_found_func()
with added buf_block_t* parameter in debug builds.  Define the wrapper macro
ha_search_and_update_if_found() that always takes the buf_block_t* parameter.

ha_insert_for_fold(): Rename to ha_insert_for_fold_func()
with added buf_block_t* parameter in debug builds.  Define the wrapper macro
ha_insert_for_fold() that always takes the buf_block_t* parameter.

The bulk of the AWE support was removed in r976.

buf_LRU_block_remove_hashed_page(): Overwrite (space_id,page_no)
when freeing a buffer block.  This will help catching non-file
pages being passed to buf_block_align().

btr_search_guess_on_hash(), btr_search_validate(): Instead of
buf_block_align(), call buf_page_hash_get(), and allow it to return NULL.

with block->frame, because in btr_search_guess_on_hash(), it may
occur that block->buf_fix_count == 0.

calls buf_block_get_frame(block) with block->frame in order
to avoid debug assertions about block->buf_fix_count == 0.

On POSIX, use mmap() and munmap().  On Windows, use VirtualAlloc()
and VirtualFree().  Only on Netware, use ut_malloc_low() and ut_free().
The lower-level functions on POSIX and Windows allow InnoDB to return
memory to the operating system when the buffer pool is shrunk.

to allow the code to be built with UNIV_DEBUG but without UNIV_SYNC_DEBUG.

Instead, get buf_block_t* as a parameter.

Without this patch, buf_page_hash_get() would return NULL in
buf_block_align().  The function buf_LRU_search_and_free_block()
invokes buf_LRU_block_remove_hashed_page(), which removes the
hash mapping needed by buf_page_hash_get().

This was forgotten from r977.

debug assertions.  This was forgotten from r977.