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d78173828e
As btrfs showed, a partial read of data in AIO /O_DIRECT circumstances can really confuse MariaDB. Filipe Manana (SuSE)[1] showed how database programmers can assume O_DIRECT is all or nothing. While a fix was done in the kernel side, we can do better in our code by requesting that the rest of the block be read/written synchronously if we do only get a partial read/write. Per the APIs, a partial read/write can occur before an error, so reattempting the request will leave the caller with a concrete error to handle. [1] https://lore.kernel.org/linux-btrfs/CABVffENfbsC6HjGbskRZGR2NvxbnQi17gAuW65eOM+QRzsr8Bg@mail.gmail.com/T/#mb2738e675e48e0e0778a2e8d1537dec5ec0d3d3a Also spell synchronously correctly in other files.