summaryrefslogtreecommitdiffstats
path: root/kernel/fs/nfs/filelayout/filelayout.h
blob: 2896cb833a11375e064f926c3a50b5cbfd499f39 (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
/*
 *  NFSv4 file layout driver data structures.
 *
 *  Copyright (c) 2002
 *  The Regents of the University of Michigan
 *  All Rights Reserved
 *
 *  Dean Hildebrand <dhildebz@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 or warranty
 *  of any kind either express or implied, including without limitation
 *  the implied warranties of merchantability, fitness for a particular
 *  purpose, or noninfringement.  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 of 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_NFS4FILELAYOUT_H
#define FS_NFS_NFS4FILELAYOUT_H

#include "../pnfs.h"

/*
 * Field testing shows we need to support up to 4096 stripe indices.
 * We store each index as a u8 (u32 on the wire) to keep the memory footprint
 * reasonable. This in turn means we support a maximum of 256
 * RFC 5661 multipath_list4 structures.
 */
#define NFS4_PNFS_MAX_STRIPE_CNT 4096
#define NFS4_PNFS_MAX_MULTI_CNT  256 /* 256 fit into a u8 stripe_index */

enum stripetype4 {
	STRIPE_SPARSE = 1,
	STRIPE_DENSE = 2
};

struct nfs4_file_layout_dsaddr {
	struct nfs4_deviceid_node	id_node;
	u32				stripe_count;
	u8				*stripe_indices;
	u32				ds_num;
	struct nfs4_pnfs_ds		*ds_list[1];
};

struct nfs4_filelayout_segment {
	struct pnfs_layout_segment generic_hdr;
	u32 stripe_type;
	u32 commit_through_mds;
	u32 stripe_unit;
	u32 first_stripe_index;
	u64 pattern_offset;
	struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
	unsigned int num_fh;
	struct nfs_fh **fh_array;
};

struct nfs4_filelayout {
	struct pnfs_layout_hdr generic_hdr;
	struct pnfs_ds_commit_info commit_info;
};

static inline struct nfs4_filelayout *
FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
{
	return container_of(lo, struct nfs4_filelayout, generic_hdr);
}

static inline struct nfs4_filelayout_segment *
FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
{
	return container_of(lseg,
			    struct nfs4_filelayout_segment,
			    generic_hdr);
}

static inline struct nfs4_deviceid_node *
FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
{
	return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
}

static inline bool
filelayout_test_devid_invalid(struct nfs4_deviceid_node *node)
{
	return test_bit(NFS_DEVICEID_INVALID, &node->flags);
}

extern bool
filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node);

extern struct nfs_fh *
nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);

u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
					u32 ds_idx);

extern struct nfs4_file_layout_dsaddr *
nfs4_fl_alloc_deviceid_node(struct nfs_server *server,
	struct pnfs_device *pdev, gfp_t gfp_flags);
extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);

#endif /* FS_NFS_NFS4FILELAYOUT_H */