tree 47f6c4f274b3b6989869734b32afdc2e5d85769d
parent c761d96b079e99d106fa4064e730ef7d0f312f9d
author Matthew Wilcox <matthew.r.wilcox@intel.com> 1420646734 +0200
committer Jens Axboe <axboe@fb.com> 1421211491 -0700

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>