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branches/zip: buf_LRU_free_block(): Check if the block has been reloaded

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to the buffer pool while we were not holding buf_pool->mutex.  If it was,
do not attempt to preserve the compressed page.
This commit is contained in:
marko
2007-01-08 14:58:20 +00:00
parent 9d9714b8f3
commit 186549b911
1 changed files with 16 additions and 8 deletions
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24
buf/buf0lru.c
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@@ -925,21 +925,29 @@ buf_LRU_free_block(
mutex_enter(&(buf_pool->mutex));
if (bpage->zip.data) {
/* Keep the compressed page.
Allocate a block descriptor for it. */
buf_page_t* b = buf_buddy_alloc(sizeof *b, FALSE);
const ulint fold = buf_page_address_fold(
bpage->space, bpage->offset);
buf_page_t* b = buf_page_hash_get(
bpage->space, bpage->offset);
if (UNIV_LIKELY_NULL(b)) {
/* The block was reloaded to the buffer pool
while we were not holding buf_pool->mutex.
Free this block entirely; do not attempt to
preserve the compressed page. */
b = NULL;
} else {
/* Keep the compressed page.
Allocate a block descriptor for it. */
b = buf_buddy_alloc(sizeof *b, FALSE);
}
if (b) {
ulint fold;
memcpy(b, bpage, sizeof *b);
b->state = b->oldest_modification
? BUF_BLOCK_ZIP_DIRTY
: BUF_BLOCK_ZIP_PAGE;
fold = buf_page_address_fold(b->space,
b->offset);
HASH_INSERT(buf_page_t, hash,
buf_pool->page_hash, fold, b);