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* Copyright (C) from 2011
* Boaz Harrosh <>
* This file is part of the objects raid engine (ore).
* It is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
* You should have received a copy of the GNU General Public License
* along with "ore". If not, write to the Free Software Foundation, Inc:
* "Free Software Foundation <>"
#include <scsi/osd_ore.h>
#define ORE_ERR(fmt, a...) printk(KERN_ERR "ore: " fmt, ##a)
#define ORE_DBGMSG(fmt, a...) \
printk(KERN_NOTICE "ore @%s:%d: " fmt, __func__, __LINE__, ##a)
#define ORE_DBGMSG(fmt, a...) \
do { if (0) printk(fmt, ##a); } while (0)
/* u64 has problems with printk this will cast it to unsigned long long */
#define _LLU(x) (unsigned long long)(x)
#define ORE_DBGMSG2(M...) do {} while (0)
/* #define ORE_DBGMSG2 ORE_DBGMSG */
/* Calculate the component order in a stripe. eg the logical data unit
* address within the stripe of @dev given the @par_dev of this stripe.
static inline unsigned _dev_order(unsigned devs_in_group, unsigned mirrors_p1,
unsigned par_dev, unsigned dev)
unsigned first_dev = dev - dev % devs_in_group;
dev -= first_dev;
par_dev -= first_dev;
if (devs_in_group == par_dev) /* The raid 0 case */
return dev / mirrors_p1;
/* raid4/5/6 case */
return ((devs_in_group + dev - par_dev - mirrors_p1) % devs_in_group) /
/* ios_raid.c stuff needed by ios.c */
int _ore_post_alloc_raid_stuff(struct ore_io_state *ios);
void _ore_free_raid_stuff(struct ore_io_state *ios);
void _ore_add_sg_seg(struct ore_per_dev_state *per_dev, unsigned cur_len,
bool not_last);
int _ore_add_parity_unit(struct ore_io_state *ios, struct ore_striping_info *si,
struct ore_per_dev_state *per_dev, unsigned cur_len);
void _ore_add_stripe_page(struct __stripe_pages_2d *sp2d,
struct ore_striping_info *si, struct page *page);
static inline void _add_stripe_page(struct __stripe_pages_2d *sp2d,
struct ore_striping_info *si, struct page *page)
if (!sp2d) /* Inline the fast path */
return; /* Hay no raid stuff */
_ore_add_stripe_page(sp2d, si, page);
/* ios.c stuff needed by ios_raid.c */
int _ore_get_io_state(struct ore_layout *layout,
struct ore_components *oc, unsigned numdevs,
unsigned sgs_per_dev, unsigned num_par_pages,
struct ore_io_state **pios);
int _ore_add_stripe_unit(struct ore_io_state *ios, unsigned *cur_pg,
unsigned pgbase, struct page **pages,
struct ore_per_dev_state *per_dev, int cur_len);
int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp);
int ore_io_execute(struct ore_io_state *ios);