and merged in r2324:

ibuf_page(): Assert that recv_no_ibuf_operations == FALSE.

fil_io(): Check !recv_no_ibuf_operations before calling ibuf_page().

buf_page_get_gen(): Once again, zip_size must always match the
compressed page size of the tablespace where the page is requested from.
This seems to hold also for all calls from the insert buffer.

buf_page_optimistic_get_func(): Do not pass mtr to ibuf_page(), because
there is no guarantee that mtr would contain an x-latch to the insert
buffer bitmap page that covers (block->page.space, block->page.offset).

zip_size should always equal fil_space_get_zip_size(space), even when called
from ibuf.

ibuf_page() should be called with mtr=NULL to be equivalent to the original
implementation.  We cannot assume that mtr holds an x-latch on the insert
buffer bitmap page that covers the page that is being requested.

differ from branches/zip.

so that this will be identical to branches/zip.

differences from branches/zip.  The __attribute__((unused)) should
work on all platforms.  When compiled with something else than GCC,
MySQL supposedly does #define __attribute__(x) /* empty */
so that the attributes will be ignored.

from branches/zip.

btr_cur_optimistic_delete(): Split a too long line in the way it is
split in branches/zip.

buf_page_get_gen(): Add missing space in the function comment.

buf_print_io(): Restoer a removed space to the printout.

univ.i: Remove C++-style (or C99-style) comments.

buf0buf.h: Undo the white-space changes to the wrapper macros of
buf_page_get_gen().

ibuf_update_free_bits_low(): Revert the changes.  Restore the assertion
that this function must not be invoked on compressed pages.  The function
ibuf_update_free_bits_zip() is for compressed pages.

ibuf_insert_to_index_page(): Undo a white-space change.

accessing a freed record on a compressed page.

The variable srv_stats_sample_pages was declared ib_uint64_t in srv0srv.c
and unsigned long long in srv0srv.h.

the file differ from branches/zip.

btr0cur.c: Undo changes to white space that make the code differ from
branches/zip.

btr_cur_del_unmark_for_ibuf(): Remove this unused function.

btr_cur_set_deleted_flag_for_ibuf(): Add missing UNIV_INTERN specifier.
Correct the function comment.  Call btr_rec_set_deleted_flag() instead
of rec_set_deleted_flag_new(), so that delete buffering will actually
work on ROW_FORMAT=REDUNDANT tables.

closer to branches/zip.

ibuf_size_update(): Add const qualifier to the parameter "root".
Remove #ifdef UNIV_SYNC_DEBUG around ut_ad(mutex_own()).

ibuf_page(): Use the variable name local_mtr instead of mtr_local, to
be more like existing functions.  Eliminate the flag use_local_mtr.

ibuf_get_merge_page_nos(): Restore an "if (...) break; else if" to
"if (...) break; if" as in branches/zip.

ibuf_dummy_index_create(), ibuf_dummy_index_add_col(),
ibuf_contract_ext(), ibuf_insert_low(): Revert to the formatting of
branches/zip.

ibuf_print(): Do not print n_ops[].

ibuf_print_ops(): Output trailing newline.

to eliminate double negation from an assertion.

The followin mysql-tests failed (and they are known to fail):
main.information_schema        	[ fail ]
main.innodb_file_per_table_basic[ fail ]
main.type_bit_innodb           	[ fail ]

Tested against : MYSQL_SERVER_VERSION  "5.1.28"

zip size can be 0.

(These changes remove the POSIX AIO stuff)

that are used in merge sort when creating indexes.

Fix Bug#25640:

Introduce an user visible parameter innodb_stats_sample (default 8,
min 1, max 1000) and use that parameter instead of the
BTR_KEY_VAL_ESTIMATE_N_PAGES macro. Remove this macro.

Approved by:	Heikki

and incorrect "BLOB bug fix" that was suggested by Heikki.  Explain in
a comment why no such fix is needed.

in *.h files, so that the function signatures in the *.h and *.c files fully
match each other.

ut_dulint_sort(): Add a UNIV_INTERN qualifier also to the function definition.

lock_rec_restore_from_page_infimum(): Correct the comment of the parameter rec.

lock_sec_rec_read_check_and_lock(): Add the debug assertion
ut_ad(mode == LOCK_X || mode == LOCK_S).

buf_LRU_old_adjust_len(): Replace a constant ut_ad() with a preprocessor check.

buf_LRU_free_block(): Remove the check for the unlikely case
buf_pool->LRU_old == prev_b in order to simplify the function.
The check was implemented as part of r2306.

suggested by Heikki, because it breaks row_vers_impl_x_locked_off_kernel();
see Mantis issue #10.

However, now that Heikki's fix has been removed, the code may break elsewhere
when it tries to dereference half-freed or completely freed externally
stored columns.