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block: Change direct_access calling convention
In order to support accesses to larger chunks of memory, pass in a 'size' parameter (counted in bytes), and return the amount available at that address. Add a new helper function, bdev_direct_access(), to handle common functionality including partition handling, checking the length requested is positive, checking for the sector being page-aligned, and checking the length of the request does not pass the end of the partition. Signed-off-by: Matthew Wilcox <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Boaz Harrosh <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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