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remarkable-linux/include/linux/crush/mapper.h

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ceph: clean up header guards Signed-off-by: Sage Weil <sage@newdream.net>
2010-07-07 09:38:17 -06:00
#ifndef CEPH_CRUSH_MAPPER_H
#define CEPH_CRUSH_MAPPER_H
ceph: CRUSH mapping algorithm CRUSH is a pseudorandom data distribution function designed to map inputs onto a dynamic hierarchy of devices, while minimizing the extent to which inputs are remapped when the devices are added or removed. It includes some features that are specifically useful for storage, most notably the ability to map each input onto a set of N devices that are separated across administrator-defined failure domains. CRUSH is used to distribute data across the cluster of Ceph storage nodes. More information about CRUSH can be found in this paper: http://www.ssrc.ucsc.edu/Papers/weil-sc06.pdf Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 12:31:11 -06:00
/*
* CRUSH functions for find rules and then mapping an input to an
* output set.
*
* LGPL2
*/
crush: sync up with userspace .. up to ceph.git commit 1db1abc8328d ("crush: eliminate ad hoc diff between kernel and userspace"). This fixes a bunch of recently pulled coding style issues and makes includes a bit cleaner. A patch "crush:Make the function crush_ln static" from Nicholas Krause <xerofoify@gmail.com> is folded in as crush_ln() has been made static in userspace as well. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2015-06-12 04:21:07 -06:00
#include "crush.h"
ceph: CRUSH mapping algorithm CRUSH is a pseudorandom data distribution function designed to map inputs onto a dynamic hierarchy of devices, while minimizing the extent to which inputs are remapped when the devices are added or removed. It includes some features that are specifically useful for storage, most notably the ability to map each input onto a set of N devices that are separated across administrator-defined failure domains. CRUSH is used to distribute data across the cluster of Ceph storage nodes. More information about CRUSH can be found in this paper: http://www.ssrc.ucsc.edu/Papers/weil-sc06.pdf Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 12:31:11 -06:00
crush: clean up types, const-ness Move various types from int -> __u32 (or similar), and add const as appropriate. This reflects changes that have been present in the userland implementation for some time. Reviewed-by: Alex Elder <elder@inktank.com> Signed-off-by: Sage Weil <sage@inktank.com>
2012-05-07 16:38:35 -06:00
extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, int size);
extern int crush_do_rule(const struct crush_map *map,
ceph: CRUSH mapping algorithm CRUSH is a pseudorandom data distribution function designed to map inputs onto a dynamic hierarchy of devices, while minimizing the extent to which inputs are remapped when the devices are added or removed. It includes some features that are specifically useful for storage, most notably the ability to map each input onto a set of N devices that are separated across administrator-defined failure domains. CRUSH is used to distribute data across the cluster of Ceph storage nodes. More information about CRUSH can be found in this paper: http://www.ssrc.ucsc.edu/Papers/weil-sc06.pdf Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 12:31:11 -06:00
int ruleno,
int x, int *result, int result_max,
crush: eliminate CRUSH_MAX_SET result size limitation This is only present to size the temporary scratch arrays that we put on the stack. Let the caller allocate them as they wish and remove the limitation. Reflects ceph.git commit 1cfe140bf2dab99517589a82a916f4c75b9492d1. Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
2013-12-24 12:19:24 -07:00
const __u32 *weights, int weight_max,
int *scratch);
ceph: CRUSH mapping algorithm CRUSH is a pseudorandom data distribution function designed to map inputs onto a dynamic hierarchy of devices, while minimizing the extent to which inputs are remapped when the devices are added or removed. It includes some features that are specifically useful for storage, most notably the ability to map each input onto a set of N devices that are separated across administrator-defined failure domains. CRUSH is used to distribute data across the cluster of Ceph storage nodes. More information about CRUSH can be found in this paper: http://www.ssrc.ucsc.edu/Papers/weil-sc06.pdf Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 12:31:11 -06:00
#endif
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