in r3879.  Spotted by Sunny.

buf_flush_try_page(): Rename to buf_flush_page(), and change the
return type to void.  Replace the parameters space, offset with bpage,
and remove the second page hash lookup.  Note and assert that both
buf_pool_mutex and block_mutex must now be held upon entering the
function.  They will still be released by this function.

buf_flush_try_neighbors(): Replace buf_flush_try_page() with
buf_flush_page().  Make the logic easier to follow by not negating the
precondition of buf_flush_page().

rb://73 approved by Sunny Bains.  This is related to Issue #157.

remove dead code.

buf_flush_ready_for_flush(), buf_flush_try_page(): Assert that
flush_type is one of BUF_FLUSH_LRU or BUF_FLUSH_LIST.  The flush_type
comes from buf_flush_batch(), which already asserts this.  The
assertion holds for all calls in the source code.

buf_flush_try_page(): Remove the dead case BUF_FLUSH_SINGLE_PAGE
of switch (flush_type).

buf_flush_try_page(): Note why it is safe to access bpage without
holding buf_pool_mutex or block_mutex.

buf_page_struct: Note that space and offset are also protected by
buf_pool_mutex.  They are only assigned to by
buf_block_set_file_page().  Thus, it suffices for buf_flush_batch() to
hold just buf_pool_mutex when checking these fields.

buf_flush_try_page(): Rename "locked" to "is_s_latched", per Heikki's request.

buf_flush_batch(): Move the common statement mutex_exit(block_mutex)
from all if-else if-else branches before the if block.  Remove the
redundant test (buf_pool->init_flush[flush_type] == FALSE) that was
apparently copied from buf_flush_write_complete().

buf_flush_write_block_low(): Note why it is safe not to hold buf_pool_mutex
or block_mutex.  Enumerate the assumptions in debug assertions.

buf_flush_insert_sorted_into_flush_list(): Remove unused code.
Change the parameter to buf_block_t* block and assert that
block->state == BUF_BLOCK_FILE_PAGE.  This is part of Issue #155.

for caching the result of buf_page_get_state(bpage) == BUF_BLOCK_FILE_PAGE.

switch case before the switch block.

Add ChangeLog entries for r3795 r3796 r3797 r3798.

SYS_INDEXES when looking for partially created indexes.  Use the
transaction isolation level READ UNCOMMITTED to avoid interfering with
locks held by incomplete transactions that will be rolled back in a
subsequent step in the recovery.  (Issue #152)

Approved by Heikki Tuuri

helper functions that initialize some members of the transaction struct.
(Bug #41680)

innobase_trx_init(): New function: initialize some fields of a
transaction struct from a MySQL THD object.

innobase_trx_allocate(): New function: allocate and initialize a
transaction struct.

check_trx_exists(): Use the above two functions.

ha_innobase::delete_table(), ha_innobase::rename_table(),
ha_innobase::add_index(), ha_innobase::final_drop_index():
Use innobase_trx_allocate().

innobase_drop_database(): In the Windows plugin, initialize the trx_t
specially, because the THD is not available.  Otherwise, use
innobase_trx_allocate().

rb://69 accepted by Heikki Tuuri

if any of the fields are NULL.  While the tuples are equal in the
sorting order, SQL NULL is defined to be logically inequal to
anything else. (Bug #41904)

rb://70 approved by Heikki Tuuri

Add patch to fix the failing main.variables mysql-test. It started failing
after the variable innodb_use_sys_malloc was added because it matches
'%alloc%' and the test is badly written and expects that no new variables
like that will ever be added.

  ------------------------------------------------------------------------
  r3601 | marko | 2008-12-22 16:05:19 +0200 (Mon, 22 Dec 2008) | 9 lines

  branches/5.1: Make
  SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED
  a true replacement of SET GLOBAL INNODB_LOCKS_UNSAFE_FOR_BINLOG=1.
  This fixes an error that was introduced in r370, causing
  semi-consistent read not to not unlock rows in READ COMMITTED mode.
  (Bug #41671, Issue #146)

  rb://67 approved by Heikki Tuuri
  ------------------------------------------------------------------------

(false by default), for disabling InnoDB's internal memory allocator
and using system malloc/free instead.

rb://62 approved by Marko

source tree will work both under 5.1 and 6.0.  Do not add the test case
innodb_ctype_ldml.test, because it would not work under MySQL 5.1.

Refuse to create tables whose columns contain collation IDs above 255.
This removes an assertion failure that was introduced in WL#4164
(Two-byte collation IDs).

create_table_def(): Do not fail an assertion if a column contains a
charset-collation ID greater than 256. Instead, issue an error and
refuse to create the table.

The original change (branches/6.0 r2998) was rb://51 approved by Calvin Sun.

from or to 0, compress the page at the same time.  This is necessary,
because the column information stored on the compressed page will
differ between leaf and non-leaf pages.  Leaf pages are identified by
PAGE_LEVEL=0.  This bug was reported as Issue #150.

Document the similarity between btr_page_create() and
btr_page_empty().  Make the function signature of btr_page_empty()
identical with btr_page_create().  (This will add the parameter "level".)

btr_root_raise_and_insert(): Replace some code with a call to
btr_page_empty().

btr_attach_half_pages(): Assert that the page level has already been
set on both block and new_block.  Do not set it again.

btr_discard_only_page_on_level(): Document that this function is
probably never called.  Make it work on any height tree.  (Tested on
2-high tree by disabling btr_lift_page_up().)

rb://68

Use the InnoDB hash table for keeping track of INNOBASE_SHARE objects.

struct st_innobase_share: Make table_name const uchar*.  Add the member
table_name_hash.

innobase_open_tables: Change the type from HASH to hash_table_t*.

innobase_get_key(): Remove.

innobase_fold_name(): New function, for computing the fold value for the
InnoDB hash table.

get_share(), free_share(): Use the InnoDB hash functions.

innobase_end(): Free innobase_open_tables before shutting down InnoDB.
Shutting down InnoDB will invalidate all memory allocated via InnoDB.

rb://65 approved by Heikki Tuuri.  This addresses Issue #104.

the free list, zero out the node pointer field of the deleted record if
the new record would not overwrite it.  This fixes a harmless content
mismatch reported by page_zip_validate() that was reported as Issue #147.

rb://66 approved by Heikki Tuuri

  ------------------------------------------------------------------------
  r3588 | inaam | 2008-12-18 14:26:54 +0200 (Thu, 18 Dec 2008) | 8 lines

  branches/5.1

  It is a bug in unused code. If we don't calculate the hash value when
  calculating the mutex number then two pages which map to same hash
  value can get two different mutex numbers.

  Approved by: Marko
  ------------------------------------------------------------------------
  r3590 | marko | 2008-12-18 15:33:36 +0200 (Thu, 18 Dec 2008) | 11 lines

  branches/5.1: When converting a record to MySQL format, copy the default
  column values for columns that are SQL NULL.  This addresses failures in
  row-based replication (Bug #39648).

  row_prebuilt_t: Add default_rec, for the default values of the columns in
  MySQL format.

  row_sel_store_mysql_rec(): Use prebuilt->default_rec instead of
  padding columns.

  rb://64 approved by Heikki Tuuri
  ------------------------------------------------------------------------
  r3598 | marko | 2008-12-22 15:28:03 +0200 (Mon, 22 Dec 2008) | 6 lines

  branches/5.1: ibuf_delete_rec(): When the record cannot be found and
  the tablespace has been dropped, commit the mini-transaction, so that
  InnoDB will not hold the insert buffer tree latch in exclusive mode,
  causing a potential deadlock.  This bug was introduced in the fix of
  Bug #27276 in r2924.
  ------------------------------------------------------------------------

row_mysql_lock_data_dictionary(), row_mysql_freeze_data_dictionary(),
to better track down locking issues that involve dict_operation_lock.

so that the macros will expand to valid C++.  Unlike C++, C allows
implicit type conversions from void* to other pointer types.

debug assertions that should have been adjusted in r3575.

Remove 2 entries from the ChangeLog about changes not big enough.

Discussed with:	Marko

interpreter.  It was only used for updating the InnoDB internal data
dictionary when renaming or dropping tables.  It could have caused
deadlocks after acquiring latches on insert buffer bitmap pages.
This and r3544 should fix Issue #135.

Furthermore, the update-in-place-in-select does not account for
compression failure.  That was not a problem yet, since the InnoDB SQL
interpreter has so far assumed ROW_FORMAT=REDUNDANT.

rb://63 approved by Heikki Tuuri

InnoDB Plugin 1.0.2, except changes to source code comments.

index without enabling UNIV_DEBUG.

when inserting or deleting from the insert buffer B-tree.  Assert that
records in the insert buffer B-tree are never updated.  This could cure
Issue #135.

btr_cur_optimistic_insert(): Do not update the insert buffer bitmap
when inserting to the insert buffer tree.

btr_cur_optimistic_delete(): Do not update the insert buffer bitmap
when deleting from the insert buffer tree.  This could be the cause
of the assertion failure that was reported in Issue #135.

btr_cur_update_alloc_zip(): Assert that the index is not the insert
buffer.  The insert buffer will never be stored in compressed format.

btr_cur_update_in_place(), btr_cur_optimistic_update(),
btr_cur_pessimistic_update(): Assert that these functions are never
invoked on the insert buffer tree.  The insert buffer only supports
the insertion and deletion of records.

must be latched before calling mtr_commit(mtr) if the function returns TRUE.

assertion about SYNC_BUF_POOL and SYNC_BUF_BLOCK.

Originally, there were provisions in InnoDB for multiple insert buffer
B-trees, apparently one for each tablespace.

When Heikki implemented innodb_file_per_table (multiple InnoDB
tablespaces) in MySQL 4.1, he made the insert buffer live only in the
system tablespace (space 0) but left the provisions in the code.

When Osku Salerma implemented delete buffering, he also cleaned up the
insert buffer subsystem so that only one insert buffer B-tree exists.
This patch applies the clean-up to the InnoDB Plugin.

Having a separate patch of the insert buffer clean-up should help us
better compare the essential changes of the InnoDB Plugin and InnoDB+
and to track down bugs that are specific to InnoDB+.

IBUF_SPACE_ID: New constant, defined as 0.

ibuf_data_t: Remove.

ibuf_t: Add the applicable fields from ibuf_data_t.  There is only one
insert buffer tree from now on.

ibuf_page_low(), ibuf_page(): Merge to a single function ibuf_page().

fil_space_t: Remove ibuf_data.

fil_space_get_ibuf_data(): Remove.  There is only one ibuf_data, for
space IBUF_SPACE_ID.

fil_ibuf_init_at_db_start(): Remove.

ibuf_init_at_db_start(): Fuse with ibuf_data_init_for_space().

ibuf_validate_low(): Remove.  There is only one ibuf tree.

ibuf_free_excess_pages(), ibuf_header_page_get(),
ibuf_free_excess_pages(): Remove the parameter space, which was always
0.

ibuf_tree_root_get(): Remove the parameters space and data.  There is
only one ibuf tree, for space IBUF_SPACE_ID.

ibuf_data_sizes_update(): Rename to ibuf_size_update(), and remove the
parameter data.  There is only one ibuf data struct.

ibuf_build_entry_pre_4_1_x(): New function, refactored from
ibuf_build_entry_from_ibuf_rec().

ibuf_data_enough_free_for_insert(), ibuf_data_too_much_free(): Remove
the parameter data.  There is only one insert buffer tree.

ibuf_add_free_page(), ibuf_remove_free_page(): Remove the parameters
space and data.  There is only one insert buffer tree.

ibuf_get_merge_page_nos(): Add parenthesis, to reduce diffs to
branches/innodb+.

ibuf_contract_ext(): Do not pick an insert buffer tree at random.
There is only one.

ibuf_print(): Print the single insert buffer tree.

rb://19 approved by Heikki on IM

Make the variables rw_latch and buf_mode local in the for loop.
Initialize them at the beginning of each for loop round to reduce
register spilling on register-starved platforms such as the x86.  Move
the assignment of rw_latch and buf_mode from the end of the loop to
the beginning of the loop.  These parameters will only be needed in
the buf_page_get_gen() call at the start of the loop.

Remove the second (redundant) call to ibuf_should_try().

ibuf_should_try(): Now that the successful calls to this function will
be halved, halve the magic constant that ibuf_flush_count will be
compared to, accordingly.

rb://61 approved by Heikki over IM.

for (rw_latch != RW_NO_LATCH) around debug code.

redundant checks for ibuf_fixed_addr_page() || fsp_descr_page() that
were removed in r3432, and add a comment explaining why.

Thanks to Michael for reporting this bug.