Matthew Wilcox dd22f551ac
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 <matthew.r.wilcox@intel.com >
Reviewed-by: Jan Kara <jack@suse.cz >
Reviewed-by: Boaz Harrosh <boaz@plexistor.com >
Signed-off-by: Jens Axboe <axboe@fb.com >
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dd22f551ac
