tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2011
3 * Boaz Harrosh <bharrosh@panasas.com>
4 *
5 * Public Declarations of the ORE API
6 *
7 * This file is part of the ORE (Object Raid Engine) library.
8 *
9 * ORE is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation. (GPL v2)
12 *
13 * ORE is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with the ORE; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22#ifndef __ORE_H__
23#define __ORE_H__
24
25#include <scsi/osd_initiator.h>
26#include <scsi/osd_attributes.h>
27#include <scsi/osd_sec.h>
28#include <linux/pnfs_osd_xdr.h>
29
30struct ore_comp {
31 struct osd_obj_id obj;
32 u8 cred[OSD_CAP_LEN];
33};
34
35struct ore_layout {
36 /* Our way of looking at the data_map */
37 unsigned stripe_unit;
38 unsigned mirrors_p1;
39
40 unsigned group_width;
41 u64 group_depth;
42 unsigned group_count;
43};
44
45struct ore_components {
46 unsigned numdevs; /* Num of devices in array */
47 /* If @single_comp == EC_SINGLE_COMP, @comps points to a single
48 * component. else there are @numdevs components
49 */
50 enum EC_COMP_USAGE {
51 EC_SINGLE_COMP = 0, EC_MULTPLE_COMPS = 0xffffffff
52 } single_comp;
53 struct ore_comp *comps;
54 struct osd_dev **ods; /* osd_dev array */
55};
56
57struct ore_io_state;
58typedef void (*ore_io_done_fn)(struct ore_io_state *ios, void *private);
59
60struct ore_io_state {
61 struct kref kref;
62
63 void *private;
64 ore_io_done_fn done;
65
66 struct ore_layout *layout;
67 struct ore_components *comps;
68
69 /* Global read/write IO*/
70 loff_t offset;
71 unsigned long length;
72 void *kern_buff;
73
74 struct page **pages;
75 unsigned nr_pages;
76 unsigned pgbase;
77 unsigned pages_consumed;
78
79 /* Attributes */
80 unsigned in_attr_len;
81 struct osd_attr *in_attr;
82 unsigned out_attr_len;
83 struct osd_attr *out_attr;
84
85 bool reading;
86
87 /* Variable array of size numdevs */
88 unsigned numdevs;
89 struct ore_per_dev_state {
90 struct osd_request *or;
91 struct bio *bio;
92 loff_t offset;
93 unsigned length;
94 unsigned dev;
95 } per_dev[];
96};
97
98static inline unsigned ore_io_state_size(unsigned numdevs)
99{
100 return sizeof(struct ore_io_state) +
101 sizeof(struct ore_per_dev_state) * numdevs;
102}
103
104/* ore.c */
105int ore_get_rw_state(struct ore_layout *layout, struct ore_components *comps,
106 bool is_reading, u64 offset, u64 length,
107 struct ore_io_state **ios);
108int ore_get_io_state(struct ore_layout *layout, struct ore_components *comps,
109 struct ore_io_state **ios);
110void ore_put_io_state(struct ore_io_state *ios);
111
112int ore_check_io(struct ore_io_state *ios, u64 *resid);
113
114int ore_create(struct ore_io_state *ios);
115int ore_remove(struct ore_io_state *ios);
116int ore_write(struct ore_io_state *ios);
117int ore_read(struct ore_io_state *ios);
118int ore_truncate(struct ore_layout *layout, struct ore_components *comps,
119 u64 size);
120
121int extract_attr_from_ios(struct ore_io_state *ios, struct osd_attr *attr);
122
123extern const struct osd_attr g_attr_logical_length;
124
125#endif