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[1];
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_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
65 unsigned int num_fh;
66 struct nfs_fh **fh_array;
67 };
68
69 struct nfs4_filelayout {
70 struct pnfs_layout_hdr generic_hdr;
71 struct pnfs_ds_commit_info commit_info;
72 };
73
74 static inline struct nfs4_filelayout *
FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr * lo)75 FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
76 {
77 return container_of(lo, struct nfs4_filelayout, generic_hdr);
78 }
79
80 static inline struct nfs4_filelayout_segment *
FILELAYOUT_LSEG(struct pnfs_layout_segment * lseg)81 FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
82 {
83 return container_of(lseg,
84 struct nfs4_filelayout_segment,
85 generic_hdr);
86 }
87
88 static inline struct nfs4_deviceid_node *
FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment * lseg)89 FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
90 {
91 return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
92 }
93
94 static inline bool
filelayout_test_devid_invalid(struct nfs4_deviceid_node * node)95 filelayout_test_devid_invalid(struct nfs4_deviceid_node *node)
96 {
97 return test_bit(NFS_DEVICEID_INVALID, &node->flags);
98 }
99
100 extern bool
101 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node);
102
103 extern struct nfs_fh *
104 nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
105
106 u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
107 u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
108 struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
109 u32 ds_idx);
110
111 extern struct nfs4_file_layout_dsaddr *
112 nfs4_fl_alloc_deviceid_node(struct nfs_server *server,
113 struct pnfs_device *pdev, gfp_t gfp_flags);
114 extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
115 extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
116
117 #endif /* FS_NFS_NFS4FILELAYOUT_H */
118