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 */
_dev_order(unsigned devs_in_group,unsigned mirrors_p1,unsigned par_dev,unsigned dev)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);
_add_stripe_page(struct __stripe_pages_2d * sp2d,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