centos man page for disk_map_sector_rcu

DISK_MAP_SECTOR_RCU(9)						   Block Devices					    DISK_MAP_SECTOR_RCU(9)

NAME
       disk_map_sector_rcu - map sector to partition

SYNOPSIS
       struct hd_struct * disk_map_sector_rcu(struct gendisk * disk, sector_t sector);

ARGUMENTS
       disk
	   gendisk of interest

       sector
	   sector to map

DESCRIPTION
       Find out which partition sector maps to on disk. This is primarily used for stats accounting.

CONTEXT
       RCU read locked. The returned partition pointer is valid only while preemption is disabled.

RETURNS
       Found partition on success, part0 is returned if no partition matches

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						    DISK_MAP_SECTOR_RCU(9)