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 * Field testing shows we need to support up to 4096 stripe indices.
37 * We store each index as a u8 (u32 on the wire) to keep the memory footprint
38 * reasonable. This in turn means we support a maximum of 256
39 * RFC 5661 multipath_list4 structures.
40 */
41 #define NFS4_PNFS_MAX_STRIPE_CNT 4096
42 #define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */
43
44 enum stripetype4 {
45 STRIPE_SPARSE = 1,
46 STRIPE_DENSE = 2
47 };
48
49 /* Individual ip address */
50 struct nfs4_pnfs_ds_addr {
51 struct sockaddr_storage da_addr;
52 size_t da_addrlen;
53 struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
54 char *da_remotestr; /* human readable addr+port */
55 };
56
57 struct nfs4_pnfs_ds {
58 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
59 char *ds_remotestr; /* comma sep list of addrs */
60 struct list_head ds_addrs;
61 struct nfs_client *ds_clp;
62 atomic_t ds_count;
63 };
64
65 /* nfs4_file_layout_dsaddr flags */
66 #define NFS4_DEVICE_ID_NEG_ENTRY 0x00000001
67
68 struct nfs4_file_layout_dsaddr {
69 struct nfs4_deviceid_node id_node;
70 unsigned long flags;
71 u32 stripe_count;
72 u8 *stripe_indices;
73 u32 ds_num;
74 struct nfs4_pnfs_ds *ds_list[1];
75 };
76
77 struct nfs4_filelayout_segment {
78 struct pnfs_layout_segment generic_hdr;
79 u32 stripe_type;
80 u32 commit_through_mds;
81 u32 stripe_unit;
82 u32 first_stripe_index;
83 u64 pattern_offset;
84 struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
85 unsigned int num_fh;
86 struct nfs_fh **fh_array;
87 struct list_head *commit_buckets; /* Sort commits to ds */
88 int number_of_buckets;
89 };
90
91 static inline struct nfs4_filelayout_segment *
FILELAYOUT_LSEG(struct pnfs_layout_segment * lseg)92 FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
93 {
94 return container_of(lseg,
95 struct nfs4_filelayout_segment,
96 generic_hdr);
97 }
98
99 static inline struct nfs4_deviceid_node *
FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment * lseg)100 FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
101 {
102 return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
103 }
104
105 extern struct nfs_fh *
106 nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
107
108 extern void print_ds(struct nfs4_pnfs_ds *ds);
109 u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
110 u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
111 struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
112 u32 ds_idx);
113 extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
114 extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
115 struct nfs4_file_layout_dsaddr *
116 get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
117
118 #endif /* FS_NFS_NFS4FILELAYOUT_H */
119