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a1fec1db BH |
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); | |
769ba8d9 BH |
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 | } | |
a1fec1db BH |
69 | |
70 | /* ios.c stuff needed by ios_raid.c */ | |
769ba8d9 BH |
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); | |
a1fec1db BH |
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); | |
769ba8d9 BH |
78 | int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp); |
79 | int ore_io_execute(struct ore_io_state *ios); |