2 * Copyright (C) from 2011
3 * Boaz Harrosh <bharrosh@panasas.com>
5 * This file is part of the objects raid engine (ore).
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.
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>"
16 #include <scsi/osd_ore.h>
18 #define ORE_ERR(fmt, a...) printk(KERN_ERR "ore: " fmt, ##a)
20 #ifdef CONFIG_EXOFS_DEBUG
21 #define ORE_DBGMSG(fmt, a...) \
22 printk(KERN_NOTICE "ore @%s:%d: " fmt, __func__, __LINE__, ##a)
24 #define ORE_DBGMSG(fmt, a...) \
25 do { if (0) printk(fmt, ##a); } while (0)
28 /* u64 has problems with printk this will cast it to unsigned long long */
29 #define _LLU(x) (unsigned long long)(x)
31 #define ORE_DBGMSG2(M...) do {} while (0)
32 /* #define ORE_DBGMSG2 ORE_DBGMSG */
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.
37 static inline unsigned _dev_order(unsigned devs_in_group
, unsigned mirrors_p1
,
38 unsigned par_dev
, unsigned dev
)
40 unsigned first_dev
= dev
- dev
% devs_in_group
;
45 if (devs_in_group
== par_dev
) /* The raid 0 case */
46 return dev
/ mirrors_p1
;
48 return ((devs_in_group
+ dev
- par_dev
- mirrors_p1
) % devs_in_group
) /
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
);
56 void _ore_add_sg_seg(struct ore_per_dev_state
*per_dev
, unsigned cur_len
,
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
)
65 if (!sp2d
) /* Inline the fast path */
66 return; /* Hay no raid stuff */
67 _ore_add_stripe_page(sp2d
, si
, page
);
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
);
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