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16b374ca AA |
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 upto 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 { | |
51 | struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */ | |
52 | u32 ds_ip_addr; | |
53 | u32 ds_port; | |
54 | struct nfs_client *ds_clp; | |
55 | atomic_t ds_count; | |
56 | }; | |
57 | ||
568e8c49 AA |
58 | /* nfs4_file_layout_dsaddr flags */ |
59 | #define NFS4_DEVICE_ID_NEG_ENTRY 0x00000001 | |
60 | ||
16b374ca | 61 | struct nfs4_file_layout_dsaddr { |
ea8eecdd CH |
62 | struct hlist_node node; |
63 | struct nfs4_deviceid deviceid; | |
64 | atomic_t ref; | |
568e8c49 | 65 | unsigned long flags; |
16b374ca AA |
66 | u32 stripe_count; |
67 | u8 *stripe_indices; | |
68 | u32 ds_num; | |
69 | struct nfs4_pnfs_ds *ds_list[1]; | |
70 | }; | |
71 | ||
72 | struct nfs4_filelayout_segment { | |
73 | struct pnfs_layout_segment generic_hdr; | |
74 | u32 stripe_type; | |
75 | u32 commit_through_mds; | |
76 | u32 stripe_unit; | |
77 | u32 first_stripe_index; | |
78 | u64 pattern_offset; | |
79 | struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */ | |
80 | unsigned int num_fh; | |
81 | struct nfs_fh **fh_array; | |
82 | }; | |
83 | ||
84 | static inline struct nfs4_filelayout_segment * | |
85 | FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg) | |
86 | { | |
87 | return container_of(lseg, | |
88 | struct nfs4_filelayout_segment, | |
89 | generic_hdr); | |
90 | } | |
91 | ||
cfe7f412 FI |
92 | extern struct nfs_fh * |
93 | nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j); | |
94 | ||
16b374ca AA |
95 | extern void print_ds(struct nfs4_pnfs_ds *ds); |
96 | extern void print_deviceid(struct nfs4_deviceid *dev_id); | |
cfe7f412 FI |
97 | u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset); |
98 | u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j); | |
99 | struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, | |
100 | u32 ds_idx); | |
16b374ca | 101 | extern struct nfs4_file_layout_dsaddr * |
ea8eecdd CH |
102 | nfs4_fl_find_get_deviceid(struct nfs4_deviceid *dev_id); |
103 | extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr); | |
16b374ca AA |
104 | struct nfs4_file_layout_dsaddr * |
105 | get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id); | |
106 | ||
107 | #endif /* FS_NFS_NFS4FILELAYOUT_H */ |