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1/*
2 * NFSv4 file layout driver data structures.
3 *
4 * Copyright (c) 2002
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#ifndef FS_NFS_NFS4FILELAYOUT_H
31#define FS_NFS_NFS4FILELAYOUT_H
32
33#include "pnfs.h"
34
35/*
36 * Default data server connection timeout and retrans vaules.
37 * Set by module paramters dataserver_timeo and dataserver_retrans.
38 */
39#define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */
40#define NFS4_DEF_DS_RETRANS 5
41
42/*
43 * Field testing shows we need to support up to 4096 stripe indices.
44 * We store each index as a u8 (u32 on the wire) to keep the memory footprint
45 * reasonable. This in turn means we support a maximum of 256
46 * RFC 5661 multipath_list4 structures.
47 */
48#define NFS4_PNFS_MAX_STRIPE_CNT 4096
49#define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */
50
51/* error codes for internal use */
52#define NFS4ERR_RESET_TO_MDS 12001
53
54enum stripetype4 {
55 STRIPE_SPARSE = 1,
56 STRIPE_DENSE = 2
57};
58
59/* Individual ip address */
60struct nfs4_pnfs_ds_addr {
61 struct sockaddr_storage da_addr;
62 size_t da_addrlen;
63 struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
64 char *da_remotestr; /* human readable addr+port */
65};
66
67struct nfs4_pnfs_ds {
68 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
69 char *ds_remotestr; /* comma sep list of addrs */
70 struct list_head ds_addrs;
71 struct nfs_client *ds_clp;
72 atomic_t ds_count;
73};
74
75struct nfs4_file_layout_dsaddr {
76 struct nfs4_deviceid_node id_node;
77 u32 stripe_count;
78 u8 *stripe_indices;
79 u32 ds_num;
80 struct nfs4_pnfs_ds *ds_list[1];
81};
82
83struct nfs4_filelayout_segment {
84 struct pnfs_layout_segment generic_hdr;
85 u32 stripe_type;
86 u32 commit_through_mds;
87 u32 stripe_unit;
88 u32 first_stripe_index;
89 u64 pattern_offset;
90 struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
91 unsigned int num_fh;
92 struct nfs_fh **fh_array;
93};
94
95struct nfs4_filelayout {
96 struct pnfs_layout_hdr generic_hdr;
97 struct pnfs_ds_commit_info commit_info;
98};
99
100static inline struct nfs4_filelayout *
101FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
102{
103 return container_of(lo, struct nfs4_filelayout, generic_hdr);
104}
105
106static inline struct nfs4_filelayout_segment *
107FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
108{
109 return container_of(lseg,
110 struct nfs4_filelayout_segment,
111 generic_hdr);
112}
113
114static inline struct nfs4_deviceid_node *
115FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
116{
117 return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
118}
119
120static inline void
121filelayout_mark_devid_invalid(struct nfs4_deviceid_node *node)
122{
123 u32 *p = (u32 *)&node->deviceid;
124
125 printk(KERN_WARNING "NFS: Deviceid [%x%x%x%x] marked out of use.\n",
126 p[0], p[1], p[2], p[3]);
127
128 set_bit(NFS_DEVICEID_INVALID, &node->flags);
129}
130
131static inline bool
132filelayout_test_devid_invalid(struct nfs4_deviceid_node *node)
133{
134 return test_bit(NFS_DEVICEID_INVALID, &node->flags);
135}
136
137extern bool
138filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node);
139
140extern struct nfs_fh *
141nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
142
143extern void print_ds(struct nfs4_pnfs_ds *ds);
144u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
145u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
146struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
147 u32 ds_idx);
148extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
149extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
150struct nfs4_file_layout_dsaddr *
151filelayout_get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
152
153#endif /* FS_NFS_NFS4FILELAYOUT_H */