linux/fs/exofs/ore_raid.h
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   1/*
   2 * Copyright (C) from 2011
   3 * Boaz Harrosh <bharrosh@panasas.com>
   4 *
   5 * This file is part of the objects raid engine (ore).
   6 *
   7 * It is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as published
   9 * by the Free Software Foundation.
  10 *
  11 * You should have received a copy of the GNU General Public License
  12 * along with "ore". If not, write to the Free Software Foundation, Inc:
  13 *      "Free Software Foundation <info@fsf.org>"
  14 */
  15
  16#include <scsi/osd_ore.h>
  17
  18#define ORE_ERR(fmt, a...) printk(KERN_ERR "ore: " fmt, ##a)
  19
  20#ifdef CONFIG_EXOFS_DEBUG
  21#define ORE_DBGMSG(fmt, a...) \
  22        printk(KERN_NOTICE "ore @%s:%d: " fmt, __func__, __LINE__, ##a)
  23#else
  24#define ORE_DBGMSG(fmt, a...) \
  25        do { if (0) printk(fmt, ##a); } while (0)
  26#endif
  27
  28/* u64 has problems with printk this will cast it to unsigned long long */
  29#define _LLU(x) (unsigned long long)(x)
  30
  31#define ORE_DBGMSG2(M...) do {} while (0)
  32/* #define ORE_DBGMSG2 ORE_DBGMSG */
  33
  34/* Calculate the component order in a stripe. eg the logical data unit
  35 * address within the stripe of @dev given the @par_dev of this stripe.
  36 */
  37static inline unsigned _dev_order(unsigned devs_in_group, unsigned mirrors_p1,
  38                                  unsigned par_dev, unsigned dev)
  39{
  40        unsigned first_dev = dev - dev % devs_in_group;
  41
  42        dev -= first_dev;
  43        par_dev -= first_dev;
  44
  45        if (devs_in_group == par_dev) /* The raid 0 case */
  46                return dev / mirrors_p1;
  47        /* raid4/5/6 case */
  48        return ((devs_in_group + dev - par_dev - mirrors_p1) % devs_in_group) /
  49               mirrors_p1;
  50}
  51
  52/* ios_raid.c stuff needed by ios.c */
  53int _ore_post_alloc_raid_stuff(struct ore_io_state *ios);
  54void _ore_free_raid_stuff(struct ore_io_state *ios);
  55
  56void _ore_add_sg_seg(struct ore_per_dev_state *per_dev, unsigned cur_len,
  57                 bool not_last);
  58int _ore_add_parity_unit(struct ore_io_state *ios, struct ore_striping_info *si,
  59                     struct ore_per_dev_state *per_dev, unsigned cur_len);
  60void _ore_add_stripe_page(struct __stripe_pages_2d *sp2d,
  61                       struct ore_striping_info *si, struct page *page);
  62static inline void _add_stripe_page(struct __stripe_pages_2d *sp2d,
  63                                struct ore_striping_info *si, struct page *page)
  64{
  65        if (!sp2d) /* Inline the fast path */
  66                return; /* Hay no raid stuff */
  67        _ore_add_stripe_page(sp2d, si, page);
  68}
  69
  70/* ios.c stuff needed by ios_raid.c */
  71int  _ore_get_io_state(struct ore_layout *layout,
  72                        struct ore_components *oc, unsigned numdevs,
  73                        unsigned sgs_per_dev, unsigned num_par_pages,
  74                        struct ore_io_state **pios);
  75int _ore_add_stripe_unit(struct ore_io_state *ios,  unsigned *cur_pg,
  76                unsigned pgbase, struct page **pages,
  77                struct ore_per_dev_state *per_dev, int cur_len);
  78int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp);
  79int ore_io_execute(struct ore_io_state *ios);
  80
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