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branches/zip: buf_page_init_for_read(): IO-fix the block during

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buf_zip_decompress().  This will prevent btr_cur_search_to_nth_level()
from accessing a half-decompressed leaf page.  Internal B-tree nodes
(non-leaf pages) in B-tree searches are only protected by the tree
latch (index->lock) and by buffer-fixing.
This commit is contained in:
marko 2007-01-16 12:40:15 +00:00
parent ccd2090964
commit 8efb68f1c9
1 changed files with 4 additions and 0 deletions
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4
buf/buf0buf.c
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@ -2180,6 +2180,7 @@ buf_page_init_for_read(
block->page.state = BUF_BLOCK_FILE_PAGE;
ut_a(!block->page.buf_fix_count);
block->page.buf_fix_count++;;
buf_block_set_io_fix(block, BUF_IO_READ);
rw_lock_x_lock(&block->lock);
mutex_exit(&block->mutex);
mutex_exit(&buf_pool->zip_mutex);
@ -2194,8 +2195,11 @@ buf_page_init_for_read(
}
buf_zip_decompress(block, srv_use_checksums);
mutex_enter(&buf_pool->mutex);
mutex_enter(&block->mutex);
block->page.buf_fix_count--;
buf_block_set_io_fix(block, BUF_IO_NONE);
mutex_exit(&buf_pool->mutex);
mutex_exit(&block->mutex);
rw_lock_x_unlock(&block->lock);