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 | struct nfs4_file_layout_dsaddr { |
50 | struct nfs4_deviceid_node id_node; |
51 | u32 stripe_count; |
52 | u8 *stripe_indices; |
53 | u32 ds_num; |
54 | struct nfs4_pnfs_ds *ds_list[] __counted_by(ds_num); |
55 | }; |
56 | |
57 | struct nfs4_filelayout_segment { |
58 | struct pnfs_layout_segment generic_hdr; |
59 | u32 stripe_type; |
60 | u32 commit_through_mds; |
61 | u32 stripe_unit; |
62 | u32 first_stripe_index; |
63 | u64 pattern_offset; |
64 | struct nfs4_deviceid deviceid; |
65 | struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */ |
66 | unsigned int num_fh; |
67 | struct nfs_fh **fh_array; |
68 | }; |
69 | |
70 | struct nfs4_filelayout { |
71 | struct pnfs_layout_hdr generic_hdr; |
72 | struct pnfs_ds_commit_info commit_info; |
73 | }; |
74 | |
75 | static inline struct nfs4_filelayout * |
76 | FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo) |
77 | { |
78 | return container_of(lo, struct nfs4_filelayout, generic_hdr); |
79 | } |
80 | |
81 | static inline struct nfs4_filelayout_segment * |
82 | FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg) |
83 | { |
84 | return container_of(lseg, |
85 | struct nfs4_filelayout_segment, |
86 | generic_hdr); |
87 | } |
88 | |
89 | static inline struct nfs4_deviceid_node * |
90 | FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg) |
91 | { |
92 | return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node; |
93 | } |
94 | |
95 | static inline bool |
96 | filelayout_test_devid_invalid(struct nfs4_deviceid_node *node) |
97 | { |
98 | return test_bit(NFS_DEVICEID_INVALID, &node->flags); |
99 | } |
100 | |
101 | extern bool |
102 | filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node); |
103 | |
104 | extern struct nfs_fh * |
105 | nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j); |
106 | |
107 | u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset); |
108 | u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j); |
109 | struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, |
110 | u32 ds_idx); |
111 | |
112 | extern struct nfs4_file_layout_dsaddr * |
113 | nfs4_fl_alloc_deviceid_node(struct nfs_server *server, |
114 | struct pnfs_device *pdev, gfp_t gfp_flags); |
115 | extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr); |
116 | extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr); |
117 | |
118 | #endif /* FS_NFS_NFS4FILELAYOUT_H */ |
119 | |