fs/exofs/ore_raid.h

   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 /* ios_raid.c stuff needed by ios.c */
  35 int _ore_post_alloc_raid_stuff(struct ore_io_state *ios);
  36 void _ore_free_raid_stuff(struct ore_io_state *ios);
  37
  38 void _ore_add_sg_seg(struct ore_per_dev_state *per_dev, unsigned cur_len,
  39                  bool not_last);
  40 int _ore_add_parity_unit(struct ore_io_state *ios, struct ore_striping_info *si,
  41                      struct ore_per_dev_state *per_dev, unsigned cur_len,
  42                      bool do_xor);
  43 void _ore_add_stripe_page(struct __stripe_pages_2d *sp2d,
  44                        struct ore_striping_info *si, struct page *page);
  45 static inline void _add_stripe_page(struct __stripe_pages_2d *sp2d,
  46                                 struct ore_striping_info *si, struct page *page)
  47 {
  48         if (!sp2d) /* Inline the fast path */
  49                 return; /* Hay no raid stuff */
  50         _ore_add_stripe_page(sp2d, si, page);
  51 }
  52
  53 /* ios.c stuff needed by ios_raid.c */
  54 int  _ore_get_io_state(struct ore_layout *layout,
  55                         struct ore_components *oc, unsigned numdevs,
  56                         unsigned sgs_per_dev, unsigned num_par_pages,
  57                         struct ore_io_state **pios);
  58 int _ore_add_stripe_unit(struct ore_io_state *ios,  unsigned *cur_pg,
  59                 unsigned pgbase, struct page **pages,
  60                 struct ore_per_dev_state *per_dev, int cur_len);
  61 int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp);
  62 int ore_io_execute(struct ore_io_state *ios);