Commit | Line | Data |
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155e7524 FI |
1 | /* |
2 | * linux/fs/nfs/blocklayout/blocklayout.h | |
3 | * | |
4 | * Module for the NFSv4.1 pNFS block layout driver. | |
5 | * | |
6 | * Copyright (c) 2006 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Andy Adamson <andros@citi.umich.edu> | |
10 | * Fred Isaman <iisaman@umich.edu> | |
11 | * | |
12 | * permission is granted to use, copy, create derivative works and | |
13 | * redistribute this software and such derivative works for any purpose, | |
14 | * so long as the name of the university of michigan is not used in | |
15 | * any advertising or publicity pertaining to the use or distribution | |
16 | * of this software without specific, written prior authorization. if | |
17 | * the above copyright notice or any other identification of the | |
18 | * university of michigan is included in any copy of any portion of | |
19 | * this software, then the disclaimer below must also be included. | |
20 | * | |
21 | * this software is provided as is, without representation from the | |
22 | * university of michigan as to its fitness for any purpose, and without | |
23 | * warranty by the university of michigan of any kind, either express | |
24 | * or implied, including without limitation the implied warranties of | |
25 | * merchantability and fitness for a particular purpose. the regents | |
26 | * of the university of michigan shall not be liable for any damages, | |
27 | * including special, indirect, incidental, or consequential damages, | |
28 | * with respect to any claim arising out or in connection with the use | |
29 | * of the software, even if it has been or is hereafter advised of the | |
30 | * possibility of such damages. | |
31 | */ | |
32 | #ifndef FS_NFS_NFS4BLOCKLAYOUT_H | |
33 | #define FS_NFS_NFS4BLOCKLAYOUT_H | |
34 | ||
35 | #include <linux/device-mapper.h> | |
36 | #include <linux/nfs_fs.h> | |
fe0a9b74 JR |
37 | #include <linux/sunrpc/rpc_pipe_fs.h> |
38 | ||
694e096f | 39 | #include "../nfs4_fs.h" |
155e7524 | 40 | #include "../pnfs.h" |
9e2e74db | 41 | #include "../netns.h" |
155e7524 | 42 | |
09cbfeaf KS |
43 | #define PAGE_CACHE_SECTORS (PAGE_SIZE >> SECTOR_SHIFT) |
44 | #define PAGE_CACHE_SECTOR_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) | |
fe6e1e8d | 45 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) |
c1c2a4cd | 46 | |
5c83746a CH |
47 | struct pnfs_block_dev; |
48 | ||
5c83746a CH |
49 | #define PNFS_BLOCK_MAX_UUIDS 4 |
50 | #define PNFS_BLOCK_MAX_DEVICES 64 | |
51 | ||
52 | /* | |
53 | * Random upper cap for the uuid length to avoid unbounded allocation. | |
54 | * Not actually limited by the protocol. | |
55 | */ | |
56 | #define PNFS_BLOCK_UUID_LEN 128 | |
57 | ||
5c83746a CH |
58 | struct pnfs_block_volume { |
59 | enum pnfs_block_volume_type type; | |
60 | union { | |
61 | struct { | |
62 | int len; | |
63 | int nr_sigs; | |
64 | struct { | |
65 | u64 offset; | |
66 | u32 sig_len; | |
67 | u8 sig[PNFS_BLOCK_UUID_LEN]; | |
68 | } sigs[PNFS_BLOCK_MAX_UUIDS]; | |
69 | } simple; | |
70 | struct { | |
71 | u64 start; | |
72 | u64 len; | |
73 | u32 volume; | |
74 | } slice; | |
75 | struct { | |
76 | u32 volumes_count; | |
77 | u32 volumes[PNFS_BLOCK_MAX_DEVICES]; | |
78 | } concat; | |
79 | struct { | |
80 | u64 chunk_size; | |
81 | u32 volumes_count; | |
82 | u32 volumes[PNFS_BLOCK_MAX_DEVICES]; | |
83 | } stripe; | |
d9186c03 CH |
84 | struct { |
85 | enum scsi_code_set code_set; | |
86 | enum scsi_designator_type designator_type; | |
87 | int designator_len; | |
88 | u8 designator[256]; | |
89 | u64 pr_key; | |
90 | } scsi; | |
5c83746a CH |
91 | }; |
92 | }; | |
93 | ||
94 | struct pnfs_block_dev_map { | |
b3960475 BC |
95 | u64 start; |
96 | u64 len; | |
97 | u64 disk_offset; | |
5c83746a CH |
98 | struct block_device *bdev; |
99 | }; | |
100 | ||
fe0a9b74 | 101 | struct pnfs_block_dev { |
5c83746a CH |
102 | struct nfs4_deviceid_node node; |
103 | ||
104 | u64 start; | |
105 | u64 len; | |
106 | ||
107 | u32 nr_children; | |
108 | struct pnfs_block_dev *children; | |
109 | u64 chunk_size; | |
110 | ||
111 | struct block_device *bdev; | |
112 | u64 disk_offset; | |
113 | ||
d9186c03 CH |
114 | u64 pr_key; |
115 | bool pr_registered; | |
116 | ||
5c83746a CH |
117 | bool (*map)(struct pnfs_block_dev *dev, u64 offset, |
118 | struct pnfs_block_dev_map *map); | |
fe0a9b74 JR |
119 | }; |
120 | ||
155e7524 FI |
121 | /* sector_t fields are all in 512-byte sectors */ |
122 | struct pnfs_block_extent { | |
8067253c CH |
123 | union { |
124 | struct rb_node be_node; | |
125 | struct list_head be_list; | |
126 | }; | |
20d655d6 | 127 | struct nfs4_deviceid_node *be_device; |
155e7524 FI |
128 | sector_t be_f_offset; /* the starting offset in the file */ |
129 | sector_t be_length; /* the size of the extent */ | |
130 | sector_t be_v_offset; /* the starting offset in the volume */ | |
8bb28975 | 131 | enum pnfs_block_extent_state be_state; /* the state of this extent */ |
8067253c CH |
132 | #define EXTENT_WRITTEN 1 |
133 | #define EXTENT_COMMITTING 2 | |
134 | unsigned int be_tag; | |
90ace12a FI |
135 | }; |
136 | ||
155e7524 | 137 | struct pnfs_block_layout { |
8067253c CH |
138 | struct pnfs_layout_hdr bl_layout; |
139 | struct rb_root bl_ext_rw; | |
140 | struct rb_root bl_ext_ro; | |
155e7524 | 141 | spinlock_t bl_ext_lock; /* Protects list manipulation */ |
d9186c03 | 142 | bool bl_scsi_layout; |
41963c10 | 143 | u64 bl_lwb; |
155e7524 FI |
144 | }; |
145 | ||
2f9fd182 FI |
146 | static inline struct pnfs_block_layout * |
147 | BLK_LO2EXT(struct pnfs_layout_hdr *lo) | |
155e7524 FI |
148 | { |
149 | return container_of(lo, struct pnfs_block_layout, bl_layout); | |
150 | } | |
151 | ||
a60d2ebd FI |
152 | static inline struct pnfs_block_layout * |
153 | BLK_LSEG2EXT(struct pnfs_layout_segment *lseg) | |
154 | { | |
155 | return BLK_LO2EXT(lseg->pls_layout); | |
156 | } | |
157 | ||
5ffaf855 SK |
158 | struct bl_pipe_msg { |
159 | struct rpc_pipe_msg msg; | |
160 | wait_queue_head_t *bl_wq; | |
161 | }; | |
162 | ||
fe0a9b74 JR |
163 | struct bl_msg_hdr { |
164 | u8 type; | |
165 | u16 totallen; /* length of entire message, including hdr itself */ | |
166 | }; | |
167 | ||
fe0a9b74 JR |
168 | #define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */ |
169 | #define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/ | |
170 | #define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */ | |
171 | #define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */ | |
172 | #define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */ | |
173 | ||
5c83746a CH |
174 | /* dev.c */ |
175 | struct nfs4_deviceid_node *bl_alloc_deviceid_node(struct nfs_server *server, | |
176 | struct pnfs_device *pdev, gfp_t gfp_mask); | |
177 | void bl_free_deviceid_node(struct nfs4_deviceid_node *d); | |
178 | ||
8067253c CH |
179 | /* extent_tree.c */ |
180 | int ext_tree_insert(struct pnfs_block_layout *bl, | |
181 | struct pnfs_block_extent *new); | |
182 | int ext_tree_remove(struct pnfs_block_layout *bl, bool rw, sector_t start, | |
183 | sector_t end); | |
184 | int ext_tree_mark_written(struct pnfs_block_layout *bl, sector_t start, | |
41963c10 | 185 | sector_t len, u64 lwb); |
8067253c CH |
186 | bool ext_tree_lookup(struct pnfs_block_layout *bl, sector_t isect, |
187 | struct pnfs_block_extent *ret, bool rw); | |
34dc93c2 CH |
188 | int ext_tree_prepare_commit(struct nfs4_layoutcommit_args *arg); |
189 | void ext_tree_mark_committed(struct nfs4_layoutcommit_args *arg, int status); | |
03341d2c | 190 | |
871760ce | 191 | /* rpc_pipefs.c */ |
5c83746a CH |
192 | dev_t bl_resolve_deviceid(struct nfs_server *server, |
193 | struct pnfs_block_volume *b, gfp_t gfp_mask); | |
871760ce | 194 | int __init bl_init_pipefs(void); |
d9186c03 | 195 | void bl_cleanup_pipefs(void); |
871760ce | 196 | |
155e7524 | 197 | #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */ |