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TOMOYO Linux Cross Reference
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  */
 37 static 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 */
 53 int _ore_post_alloc_raid_stuff(struct ore_io_state *ios);
 54 void _ore_free_raid_stuff(struct ore_io_state *ios);
 55 
 56 void _ore_add_sg_seg(struct ore_per_dev_state *per_dev, unsigned cur_len,
 57                  bool not_last);
 58 int _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);
 60 void _ore_add_stripe_page(struct __stripe_pages_2d *sp2d,
 61                        struct ore_striping_info *si, struct page *page);
 62 static 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 */
 71 int  _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);
 75 int _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);
 78 int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp);
 79 int ore_io_execute(struct ore_io_state *ios);
 80 

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