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.

buf_pool_t: Remove n_frames, max_size, and blocks_of_frames.
The current buffer pool size is in curr_size.

buf_pool_init(): Remove parameter max_size.

buf_pool_get_max_size(), buf_pool_is_block(): Remove.

buf_block_align(): Do not assume that the buffer pool is allocated
in one chunk.  Replace dependency on buf_pool->blocks_of_frames
with a call to buf_page_hash_get().

Removal of the variable innobase_buffer_pool_awe_mem_mb requires
coordination with MySQL AB.

Do not break the latching order in TRUNCATE TABLE.

dict_truncate_index_tree(): Replace parameter rec_t* rec with
btr_pcur_t* pcur.  Reposition pcur before calling btr_create().

sync_thread_add_level(): Remove the relaxation of the assertion added in r968.

The code was previously unused in non-debug builds.

btr_pcur_restore_position(): Add const qualifiers.

buf_LRU_block_remove_hashed_page(): Reduce the amount
of buf_page_hash_get() calls and add a UNIV_UNLIKELY hint
to an assertion-like test.

returns the compressed page size in kilobytes, not bytes.

about block->frame matching rec.

row_ins_check_foreign_constraint(): Pass the correct block to
the lock_ functions.

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.