while accessing table->locks or un_member.tab_lock.locks.
This is related to Issue #158.  According to static analysis,
the added debug assertions should always hold.

lock_table_has_to_wait_in_queue(), lock_queue_iterator_reset(),
lock_queue_iterator_get_prev(), add_trx_relevant_locks_to_cache(),
fetch_data_into_cache(): Add ut_ad(mutex_own(&kernel_mutex)).

Add ChangeLog entries for the bug fixes in r3911 and r3930.

buf_LRU_block_free_non_file_page(): ut_ad(block) before dereferencing block.

buf_LRU_block_remove_hashed_page(): Forbid buf_pool_mutex_exit() while
calling buf_buddy_free().  Callers of buf_LRU_block_remove_hashed_page()
assume that the buffer pool mutex will not be released and reacquired.

Add comments and assertions that buf_LRU_block_remove_hashed_page()
will release block_mutex when it returns BUF_BLOCK_ZIP_FREE.

  ------------------------------------------------------------------------
  r3911 | sunny | 2009-01-13 14:15:24 +0200 (Tue, 13 Jan 2009) | 13 lines

  branches/5.1: Fix Bug#38187 Error 153 when creating savepoints
  InnoDB previously treated savepoints as a stack e.g.,
    SAVEPOINT a;
    SAVEPOINT b;
    SAVEPOINT c;
    SAVEPOINT b; <- This would delete b and c.

  This fix changes the behavior to:
    SAVEPOINT a;
    SAVEPOINT b;
    SAVEPOINT c;
    SAVEPOINT b; <- Does not delete savepoint c
  ------------------------------------------------------------------------
  r3930 | marko | 2009-01-14 15:51:30 +0200 (Wed, 14 Jan 2009) | 4 lines

  branches/5.1: dict_load_table(): If dict_load_indexes() fails,
  invoke dict_table_remove_from_cache() instead of dict_mem_table_free(),
  so that the data dictionary will not point to freed data.
  (Bug #42075, Issue #153, rb://76 approved by Heikki Tuuri)
  ------------------------------------------------------------------------

satisfy some conditions when UNIV_DEBUG is defined.

HASH_SEARCH(): New parameter: ASSERTION. All users will pass an appropriate
ut_ad() or nothing.

dict_table_add_to_columns(): Assert that the table being added to the data
dictionary cache is not already being pointed to by the name_hash and
id_hash tables.

HASH_SEARCH_ALL(): New macro, for use in dict_table_add_to_columns().

dict_mem_table_free(): Set ut_d(table->cached = FALSE), so that we can
check ut_ad(table->cached) when traversing the hash tables, as in
HASH_SEARCH(name_hash, dict_sys->table_hash, ...) and
HASH_SEARCH(id_hash, dict_sys->table_id_hash, ...).

dict_table_get_low(), dict_table_get_on_id_low(): Assert
ut_ad(!table || table->cached).

fil_space_get_by_id(): Check ut_ad(space->magic_n == FIL_SPACE_MAGIC_N)
in HASH_SEARCH(hash, fil_system->spaces, ...).

fil_space_get_by_name(): Check ut_ad(space->magic_n == FIL_SPACE_MAGIC_N)
in HASH_SEARCH(name_hash, fil_system->name_hash, ...).

buf_buddy_block_free(): Check that the blocks are in valid state in
HASH_SEARCH(hash, buf_pool->zip_hash, ...).

buf_page_hash_get(): Check that the blocks are in valid state in
HASH_SEARCH(hash, buf_pool->page_hash, ...).

get_share(), free_share(): Check ut_ad(share->use_count > 0) in
HASH_SEARCH(table_name_hash, innobase_open_tables, ...).

This was posted as rb://75 for tracking down errors similar to Issue #153.

row_create_table_for_mysql() already frees new_table.
Do not attempt to free it again.

that was introduced in r3879 (rb://73).

buf_page_t: Note that the LRU fields are protected by buf_pool_mutex
only, not block->mutex or buf_pool_zip_mutex.

buf_page_get_freed_page_clock(): Note that this is sometimes invoked
without mutex protection.

buf_pool_get_oldest_modification(): Note that the result may be out of
date.

buf_page_get_LRU_position(), buf_page_is_old(): Assert that the buffer
pool mutex is being held.

buf_page_release(): Assert that dirty blocks are in the flush list.

unless UNIV_DEBUG is defined.  mtr->magic_n is only assigned to
and checked in UNIV_DEBUG builds.

instead of the buffer pool mutex.  This is related to Issue #157.

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.