Below is the list of changes that have just been committed into a local
5.0 repository of istruewing. When istruewing does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html
ChangeSet@stripped, 2007-05-31 20:04:54+02:00, istruewing@stripped +4 -0
Bug#28478 - Improper key_cache_block_size corrupts MyISAM tables
Setting a key_cache_block_size which is not a power of 2
could corrupt MyISAM tables.
A couple of computations in the key cache code use bit
operations which do only work if key_cache_block_size
is a power of 2.
Replaced bit operations by arithmetic operations
to make key cache able to handle block sizes that are
not a power of 2.
include/keycache.h@stripped, 2007-05-31 20:04:51+02:00, istruewing@stripped +0 -1
Bug#28478 - Improper key_cache_block_size corrupts MyISAM tables
Removed element 'key_cache_shift' from KEY_CACHE after
the changes in mf_keycache.c made it unused.
mysql-test/r/key_cache.result@stripped, 2007-05-31 20:04:51+02:00, istruewing@stripped +27 -0
Bug#28478 - Improper key_cache_block_size corrupts MyISAM tables
Added test result
mysql-test/t/key_cache.test@stripped, 2007-05-31 20:04:51+02:00, istruewing@stripped +27 -0
Bug#28478 - Improper key_cache_block_size corrupts MyISAM tables
Added test
mysys/mf_keycache.c@stripped, 2007-05-31 20:04:51+02:00, istruewing@stripped +5 -6
Bug#28478 - Improper key_cache_block_size corrupts MyISAM tables
Replaced bit operations by arithmetic operations
to make key cache able to handle block sizes that are
not a power of 2.
# This is a BitKeeper patch. What follows are the unified diffs for the
# set of deltas contained in the patch. The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User: istruewing
# Host: chilla.local
# Root: /home/mydev/mysql-5.0-bug23068
--- 1.62/mysys/mf_keycache.c 2007-05-31 20:05:01 +02:00
+++ 1.63/mysys/mf_keycache.c 2007-05-31 20:05:01 +02:00
@@ -173,7 +173,7 @@ static void test_key_cache(KEY_CACHE *ke
#endif
#define KEYCACHE_HASH(f, pos) \
-(((ulong) ((pos) >> keycache->key_cache_shift)+ \
+(((ulong) ((pos) / keycache->key_cache_block_size) + \
(ulong) (f)) & (keycache->hash_entries-1))
#define FILE_HASH(f) ((uint) (f) & (CHANGED_BLOCKS_HASH-1))
@@ -329,7 +329,6 @@ int init_key_cache(KEY_CACHE *keycache,
keycache->key_cache_mem_size= use_mem;
keycache->key_cache_block_size= key_cache_block_size;
- keycache->key_cache_shift= my_bit_log2(key_cache_block_size);
DBUG_PRINT("info", ("key_cache_block_size: %u",
key_cache_block_size));
@@ -352,7 +351,7 @@ int init_key_cache(KEY_CACHE *keycache,
ALIGN_SIZE(hash_links * sizeof(HASH_LINK)) +
ALIGN_SIZE(sizeof(HASH_LINK*) *
keycache->hash_entries))) +
- ((ulong) blocks << keycache->key_cache_shift) > use_mem)
+ ((ulong) blocks * keycache->key_cache_block_size) > use_mem)
blocks--;
/* Allocate memory for cache page buffers */
if ((keycache->block_mem=
@@ -1807,7 +1806,7 @@ byte *key_cache_read(KEY_CACHE *keycache
uint status;
int page_st;
- offset= (uint) (filepos & (keycache->key_cache_block_size-1));
+ offset= (uint) (filepos % keycache->key_cache_block_size);
/* Read data in key_cache_block_size increments */
do
{
@@ -1946,7 +1945,7 @@ int key_cache_insert(KEY_CACHE *keycache
int error;
uint offset;
- offset= (uint) (filepos & (keycache->key_cache_block_size-1));
+ offset= (uint) (filepos % keycache->key_cache_block_size);
do
{
keycache_pthread_mutex_lock(&keycache->cache_lock);
@@ -2081,7 +2080,7 @@ int key_cache_write(KEY_CACHE *keycache,
int page_st;
uint offset;
- offset= (uint) (filepos & (keycache->key_cache_block_size-1));
+ offset= (uint) (filepos % keycache->key_cache_block_size);
do
{
keycache_pthread_mutex_lock(&keycache->cache_lock);
--- 1.20/mysql-test/r/key_cache.result 2007-05-31 20:05:01 +02:00
+++ 1.21/mysql-test/r/key_cache.result 2007-05-31 20:05:01 +02:00
@@ -341,3 +341,30 @@ Warning 1438 Cannot drop default keycach
select @@global.key_buffer_size;
@@global.key_buffer_size
2097152
+SET @bug28478_key_cache_block_size= @@global.key_cache_block_size;
+SET GLOBAL key_cache_block_size= 1536;
+CREATE TABLE t1 (
+id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
+c1 CHAR(150),
+c2 CHAR(150),
+c3 CHAR(150),
+KEY(c1, c2, c3)
+) ENGINE= MyISAM;
+INSERT INTO t1 (c1, c2, c3) VALUES
+('a', 'b', 'c'), ('b', 'c', 'd'), ('c', 'd', 'e'), ('d', 'e', 'f'),
+('e', 'f', 'g'), ('f', 'g', 'h'), ('g', 'h', 'i'), ('h', 'i', 'j'),
+('i', 'j', 'k'), ('j', 'k', 'l'), ('k', 'l', 'm'), ('l', 'm', 'n'),
+('m', 'n', 'o'), ('n', 'o', 'p'), ('o', 'p', 'q'), ('p', 'q', 'r'),
+('q', 'r', 's'), ('r', 's', 't'), ('s', 't', 'u'), ('t', 'u', 'v'),
+('u', 'v', 'w'), ('v', 'w', 'x'), ('w', 'x', 'y'), ('x', 'y', 'z');
+INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t1;
+INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t1;
+INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t1;
+CHECK TABLE t1;
+Table Op Msg_type Msg_text
+test.t1 check status OK
+SHOW VARIABLES LIKE 'key_cache_block_size';
+Variable_name Value
+key_cache_block_size 1536
+SET GLOBAL key_cache_block_size= @bug28478_key_cache_block_size;
+DROP TABLE t1;
--- 1.19/mysql-test/t/key_cache.test 2007-05-31 20:05:01 +02:00
+++ 1.20/mysql-test/t/key_cache.test 2007-05-31 20:05:01 +02:00
@@ -219,4 +219,31 @@ set global key_cache_block_size= @my_key
set @@global.key_buffer_size=0;
select @@global.key_buffer_size;
+#
+# Bug#28478 - Improper key_cache_block_size corrupts MyISAM tables
+#
+SET @bug28478_key_cache_block_size= @@global.key_cache_block_size;
+SET GLOBAL key_cache_block_size= 1536;
+CREATE TABLE t1 (
+ id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
+ c1 CHAR(150),
+ c2 CHAR(150),
+ c3 CHAR(150),
+ KEY(c1, c2, c3)
+ ) ENGINE= MyISAM;
+INSERT INTO t1 (c1, c2, c3) VALUES
+ ('a', 'b', 'c'), ('b', 'c', 'd'), ('c', 'd', 'e'), ('d', 'e', 'f'),
+ ('e', 'f', 'g'), ('f', 'g', 'h'), ('g', 'h', 'i'), ('h', 'i', 'j'),
+ ('i', 'j', 'k'), ('j', 'k', 'l'), ('k', 'l', 'm'), ('l', 'm', 'n'),
+ ('m', 'n', 'o'), ('n', 'o', 'p'), ('o', 'p', 'q'), ('p', 'q', 'r'),
+ ('q', 'r', 's'), ('r', 's', 't'), ('s', 't', 'u'), ('t', 'u', 'v'),
+ ('u', 'v', 'w'), ('v', 'w', 'x'), ('w', 'x', 'y'), ('x', 'y', 'z');
+INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t1;
+INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t1;
+INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t1;
+CHECK TABLE t1;
+SHOW VARIABLES LIKE 'key_cache_block_size';
+SET GLOBAL key_cache_block_size= @bug28478_key_cache_block_size;
+DROP TABLE t1;
+
# End of 4.1 tests
--- 1.7/include/keycache.h 2007-05-31 20:05:01 +02:00
+++ 1.8/include/keycache.h 2007-05-31 20:05:01 +02:00
@@ -46,7 +46,6 @@ typedef struct st_key_cache
my_bool key_cache_inited;
my_bool resize_in_flush; /* true during flush of resize operation */
my_bool can_be_used; /* usage of cache for read/write is allowed */
- uint key_cache_shift;
ulong key_cache_mem_size; /* specified size of the cache memory */
uint key_cache_block_size; /* size of the page buffer of a cache block */
ulong min_warm_blocks; /* min number of warm blocks; */
Thread |
---|
• bk commit into 5.0 tree (istruewing:1.2466) BUG#28478 | ingo | 31 May |