summaryrefslogtreecommitdiffstats
path: root/include/scsi/osd_ore.h
blob: c5c5e008e6de742cc2f0a9cc27ed596fd0e91b10 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
/*
 * Copyright (C) 2011
 * Boaz Harrosh <bharrosh@panasas.com>
 *
 * Public Declarations of the ORE API
 *
 * This file is part of the ORE (Object Raid Engine) library.
 *
 * ORE is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation. (GPL v2)
 *
 * ORE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the ORE; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __ORE_H__
#define __ORE_H__

#include <scsi/osd_initiator.h>
#include <scsi/osd_attributes.h>
#include <scsi/osd_sec.h>
#include <linux/pnfs_osd_xdr.h>

struct ore_comp {
	struct osd_obj_id	obj;
	u8			cred[OSD_CAP_LEN];
};

struct ore_layout {
	/* Our way of looking at the data_map */
	unsigned stripe_unit;
	unsigned mirrors_p1;

	unsigned group_width;
	u64	 group_depth;
	unsigned group_count;
};

struct ore_components {
	unsigned	numdevs;		/* Num of devices in array    */
	/* If @single_comp == EC_SINGLE_COMP, @comps points to a single
	 * component. else there are @numdevs components
	 */
	enum EC_COMP_USAGE {
		EC_SINGLE_COMP = 0, EC_MULTPLE_COMPS = 0xffffffff
	}		single_comp;
	struct ore_comp	*comps;
	struct osd_dev	**ods;			/* osd_dev array              */
};

struct ore_io_state;
typedef void (*ore_io_done_fn)(struct ore_io_state *ios, void *private);

struct ore_io_state {
	struct kref		kref;

	void			*private;
	ore_io_done_fn	done;

	struct ore_layout	*layout;
	struct ore_components	*comps;

	/* Global read/write IO*/
	loff_t			offset;
	unsigned long		length;
	void			*kern_buff;

	struct page		**pages;
	unsigned		nr_pages;
	unsigned		pgbase;
	unsigned		pages_consumed;

	/* Attributes */
	unsigned		in_attr_len;
	struct osd_attr		*in_attr;
	unsigned		out_attr_len;
	struct osd_attr		*out_attr;

	bool			reading;

	/* Variable array of size numdevs */
	unsigned numdevs;
	struct ore_per_dev_state {
		struct osd_request *or;
		struct bio *bio;
		loff_t offset;
		unsigned length;
		unsigned dev;
	} per_dev[];
};

static inline unsigned ore_io_state_size(unsigned numdevs)
{
	return sizeof(struct ore_io_state) +
		sizeof(struct ore_per_dev_state) * numdevs;
}

/* ore.c */
int ore_get_rw_state(struct ore_layout *layout, struct ore_components *comps,
		     bool is_reading, u64 offset, u64 length,
		     struct ore_io_state **ios);
int ore_get_io_state(struct ore_layout *layout, struct ore_components *comps,
		     struct ore_io_state **ios);
void ore_put_io_state(struct ore_io_state *ios);

int ore_check_io(struct ore_io_state *ios, u64 *resid);

int ore_create(struct ore_io_state *ios);
int ore_remove(struct ore_io_state *ios);
int ore_write(struct ore_io_state *ios);
int ore_read(struct ore_io_state *ios);
int ore_truncate(struct ore_layout *layout, struct ore_components *comps,
		 u64 size);

int extract_attr_from_ios(struct ore_io_state *ios, struct osd_attr *attr);

extern const struct osd_attr g_attr_logical_length;

#endif
OpenPOWER on IntegriCloud