| Boaz Harrosh | a1fec1d | 2011-10-12 18:42:22 +0200 | [diff] [blame] | 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); |
| Boaz Harrosh | 769ba8d | 2011-10-14 15:33:51 +0200 | [diff] [blame] | 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 | } |
| Boaz Harrosh | a1fec1d | 2011-10-12 18:42:22 +0200 | [diff] [blame] | 69 | |
| 70 | /* ios.c stuff needed by ios_raid.c */ |
| Boaz Harrosh | 769ba8d | 2011-10-14 15:33:51 +0200 | [diff] [blame] | 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); |
| Boaz Harrosh | a1fec1d | 2011-10-12 18:42:22 +0200 | [diff] [blame] | 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); |
| Boaz Harrosh | 769ba8d | 2011-10-14 15:33:51 +0200 | [diff] [blame] | 78 | int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp); |
| 79 | int ore_io_execute(struct ore_io_state *ios); |