summaryrefslogtreecommitdiffstats
path: root/fs/nfs/blocklayout/blocklayout.h
blob: efc007f007427c84bf0e56961b51f07073b78865 (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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
/*
 *  linux/fs/nfs/blocklayout/blocklayout.h
 *
 *  Module for the NFSv4.1 pNFS block layout driver.
 *
 *  Copyright (c) 2006 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Andy Adamson <andros@citi.umich.edu>
 *  Fred Isaman <iisaman@umich.edu>
 *
 * permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any purpose,
 * so long as the name of the university of michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.  if
 * the above copyright notice or any other identification of the
 * university of michigan is included in any copy of any portion of
 * this software, then the disclaimer below must also be included.
 *
 * this software is provided as is, without representation from the
 * university of michigan as to its fitness for any purpose, and without
 * warranty by the university of michigan of any kind, either express
 * or implied, including without limitation the implied warranties of
 * merchantability and fitness for a particular purpose.  the regents
 * of the university of michigan shall not be liable for any damages,
 * including special, indirect, incidental, or consequential damages,
 * with respect to any claim arising out or in connection with the use
 * of the software, even if it has been or is hereafter advised of the
 * possibility of such damages.
 */
#ifndef FS_NFS_NFS4BLOCKLAYOUT_H
#define FS_NFS_NFS4BLOCKLAYOUT_H

#include <linux/device-mapper.h>
#include <linux/nfs_fs.h>
#include <linux/sunrpc/rpc_pipe_fs.h>

#include "../nfs4_fs.h"
#include "../pnfs.h"
#include "../netns.h"

#define PAGE_CACHE_SECTORS (PAGE_SIZE >> SECTOR_SHIFT)
#define PAGE_CACHE_SECTOR_SHIFT (PAGE_SHIFT - SECTOR_SHIFT)
#define SECTOR_SIZE (1 << SECTOR_SHIFT)

struct pnfs_block_dev;

#define PNFS_BLOCK_MAX_UUIDS	4
#define PNFS_BLOCK_MAX_DEVICES	64

/*
 * Random upper cap for the uuid length to avoid unbounded allocation.
 * Not actually limited by the protocol.
 */
#define PNFS_BLOCK_UUID_LEN	128

struct pnfs_block_volume {
	enum pnfs_block_volume_type	type;
	union {
		struct {
			int		len;
			int		nr_sigs;
			struct {
				u64		offset;
				u32		sig_len;
				u8		sig[PNFS_BLOCK_UUID_LEN];
			} sigs[PNFS_BLOCK_MAX_UUIDS];
		} simple;
		struct {
			u64		start;
			u64		len;
			u32		volume;
		} slice;
		struct {
			u32		volumes_count;
			u32		volumes[PNFS_BLOCK_MAX_DEVICES];
		} concat;
		struct {
			u64		chunk_size;
			u32		volumes_count;
			u32		volumes[PNFS_BLOCK_MAX_DEVICES];
		} stripe;
		struct {
			enum scsi_code_set		code_set;
			enum scsi_designator_type	designator_type;
			int				designator_len;
			u8				designator[256];
			u64				pr_key;
		} scsi;
	};
};

struct pnfs_block_dev_map {
	sector_t			start;
	sector_t			len;

	sector_t			disk_offset;
	struct block_device		*bdev;
};

struct pnfs_block_dev {
	struct nfs4_deviceid_node	node;

	u64				start;
	u64				len;

	u32				nr_children;
	struct pnfs_block_dev		*children;
	u64				chunk_size;

	struct block_device		*bdev;
	u64				disk_offset;

	u64				pr_key;
	bool				pr_registered;

	bool (*map)(struct pnfs_block_dev *dev, u64 offset,
			struct pnfs_block_dev_map *map);
};

/* sector_t fields are all in 512-byte sectors */
struct pnfs_block_extent {
	union {
		struct rb_node	be_node;
		struct list_head be_list;
	};
	struct nfs4_deviceid_node *be_device;
	sector_t	be_f_offset;	/* the starting offset in the file */
	sector_t	be_length;	/* the size of the extent */
	sector_t	be_v_offset;	/* the starting offset in the volume */
	enum pnfs_block_extent_state be_state;	/* the state of this extent */
#define EXTENT_WRITTEN		1
#define EXTENT_COMMITTING	2
	unsigned int	be_tag;
};

struct pnfs_block_layout {
	struct pnfs_layout_hdr	bl_layout;
	struct rb_root		bl_ext_rw;
	struct rb_root		bl_ext_ro;
	spinlock_t		bl_ext_lock;   /* Protects list manipulation */
	bool			bl_scsi_layout;
	u64			bl_lwb;
};

static inline struct pnfs_block_layout *
BLK_LO2EXT(struct pnfs_layout_hdr *lo)
{
	return container_of(lo, struct pnfs_block_layout, bl_layout);
}

static inline struct pnfs_block_layout *
BLK_LSEG2EXT(struct pnfs_layout_segment *lseg)
{
	return BLK_LO2EXT(lseg->pls_layout);
}

struct bl_pipe_msg {
	struct rpc_pipe_msg msg;
	wait_queue_head_t *bl_wq;
};

struct bl_msg_hdr {
	u8  type;
	u16 totallen; /* length of entire message, including hdr itself */
};

#define BL_DEVICE_UMOUNT               0x0 /* Umount--delete devices */
#define BL_DEVICE_MOUNT                0x1 /* Mount--create devices*/
#define BL_DEVICE_REQUEST_INIT         0x0 /* Start request */
#define BL_DEVICE_REQUEST_PROC         0x1 /* User level process succeeds */
#define BL_DEVICE_REQUEST_ERR          0x2 /* User level process fails */

/* dev.c */
struct nfs4_deviceid_node *bl_alloc_deviceid_node(struct nfs_server *server,
		struct pnfs_device *pdev, gfp_t gfp_mask);
void bl_free_deviceid_node(struct nfs4_deviceid_node *d);

/* extent_tree.c */
int ext_tree_insert(struct pnfs_block_layout *bl,
		struct pnfs_block_extent *new);
int ext_tree_remove(struct pnfs_block_layout *bl, bool rw, sector_t start,
		sector_t end);
int ext_tree_mark_written(struct pnfs_block_layout *bl, sector_t start,
		sector_t len, u64 lwb);
bool ext_tree_lookup(struct pnfs_block_layout *bl, sector_t isect,
		struct pnfs_block_extent *ret, bool rw);
int ext_tree_prepare_commit(struct nfs4_layoutcommit_args *arg);
void ext_tree_mark_committed(struct nfs4_layoutcommit_args *arg, int status);

/* rpc_pipefs.c */
dev_t bl_resolve_deviceid(struct nfs_server *server,
		struct pnfs_block_volume *b, gfp_t gfp_mask);
int __init bl_init_pipefs(void);
void bl_cleanup_pipefs(void);

#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */