Update map.cpp #669
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Update map.cpp #669
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Replace ftruncate with fallocate in map::resize_ to preallocate disk blocks, fix sparse file handling and ensure proper ENOSPC handling
Replace ::fallocate(opened_, 0, 0, size) with ::fallocate(opened_, 0, capacity_, size - capacity_) for efficiency
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Replace ftruncate with fallocate in map::resize_ to preallocate disk blocks, fix sparse file handling and ensure proper ENOSPC handling