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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 | ||
155e7524 FI |
39 | #include "../pnfs.h" |
40 | ||
2f9fd182 FI |
41 | struct block_mount_id { |
42 | spinlock_t bm_lock; /* protects list */ | |
43 | struct list_head bm_devlist; /* holds pnfs_block_dev */ | |
44 | }; | |
45 | ||
fe0a9b74 JR |
46 | struct pnfs_block_dev { |
47 | struct list_head bm_node; | |
48 | struct nfs4_deviceid bm_mdevid; /* associated devid */ | |
49 | struct block_device *bm_mdev; /* meta device itself */ | |
50 | }; | |
51 | ||
155e7524 FI |
52 | enum exstate4 { |
53 | PNFS_BLOCK_READWRITE_DATA = 0, | |
54 | PNFS_BLOCK_READ_DATA = 1, | |
55 | PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */ | |
56 | PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */ | |
57 | }; | |
58 | ||
59 | struct pnfs_inval_markings { | |
60 | /* STUB */ | |
61 | }; | |
62 | ||
63 | /* sector_t fields are all in 512-byte sectors */ | |
64 | struct pnfs_block_extent { | |
65 | struct kref be_refcnt; | |
66 | struct list_head be_node; /* link into lseg list */ | |
67 | struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */ | |
68 | struct block_device *be_mdev; | |
69 | sector_t be_f_offset; /* the starting offset in the file */ | |
70 | sector_t be_length; /* the size of the extent */ | |
71 | sector_t be_v_offset; /* the starting offset in the volume */ | |
72 | enum exstate4 be_state; /* the state of this extent */ | |
73 | struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */ | |
74 | }; | |
75 | ||
76 | static inline void | |
77 | BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize) | |
78 | { | |
79 | /* STUB */ | |
80 | } | |
81 | ||
82 | enum extentclass4 { | |
83 | RW_EXTENT = 0, /* READWRTE and INVAL */ | |
84 | RO_EXTENT = 1, /* READ and NONE */ | |
85 | EXTENT_LISTS = 2, | |
86 | }; | |
87 | ||
03341d2c FI |
88 | static inline int bl_choose_list(enum exstate4 state) |
89 | { | |
90 | if (state == PNFS_BLOCK_READ_DATA || state == PNFS_BLOCK_NONE_DATA) | |
91 | return RO_EXTENT; | |
92 | else | |
93 | return RW_EXTENT; | |
94 | } | |
95 | ||
155e7524 FI |
96 | struct pnfs_block_layout { |
97 | struct pnfs_layout_hdr bl_layout; | |
98 | struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */ | |
99 | spinlock_t bl_ext_lock; /* Protects list manipulation */ | |
100 | struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */ | |
101 | struct list_head bl_commit; /* Needs layout commit */ | |
102 | struct list_head bl_committing; /* Layout committing */ | |
103 | unsigned int bl_count; /* entries in bl_commit */ | |
104 | sector_t bl_blocksize; /* Server blocksize in sectors */ | |
105 | }; | |
106 | ||
2f9fd182 FI |
107 | #define BLK_ID(lo) ((struct block_mount_id *)(NFS_SERVER(lo->plh_inode)->pnfs_ld_data)) |
108 | ||
109 | static inline struct pnfs_block_layout * | |
110 | BLK_LO2EXT(struct pnfs_layout_hdr *lo) | |
155e7524 FI |
111 | { |
112 | return container_of(lo, struct pnfs_block_layout, bl_layout); | |
113 | } | |
114 | ||
a60d2ebd FI |
115 | static inline struct pnfs_block_layout * |
116 | BLK_LSEG2EXT(struct pnfs_layout_segment *lseg) | |
117 | { | |
118 | return BLK_LO2EXT(lseg->pls_layout); | |
119 | } | |
120 | ||
fe0a9b74 JR |
121 | struct bl_dev_msg { |
122 | int status; | |
123 | uint32_t major, minor; | |
124 | }; | |
125 | ||
126 | struct bl_msg_hdr { | |
127 | u8 type; | |
128 | u16 totallen; /* length of entire message, including hdr itself */ | |
129 | }; | |
130 | ||
131 | extern struct dentry *bl_device_pipe; | |
132 | extern wait_queue_head_t bl_wq; | |
133 | ||
134 | #define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */ | |
135 | #define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/ | |
136 | #define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */ | |
137 | #define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */ | |
138 | #define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */ | |
139 | ||
140 | /* blocklayoutdev.c */ | |
141 | ssize_t bl_pipe_upcall(struct file *, struct rpc_pipe_msg *, | |
142 | char __user *, size_t); | |
143 | ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t); | |
144 | void bl_pipe_destroy_msg(struct rpc_pipe_msg *); | |
145 | struct block_device *nfs4_blkdev_get(dev_t dev); | |
146 | int nfs4_blkdev_put(struct block_device *bdev); | |
147 | struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server, | |
2f9fd182 | 148 | struct pnfs_device *dev); |
fe0a9b74 JR |
149 | int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo, |
150 | struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); | |
151 | ||
025a70ed JR |
152 | /* blocklayoutdm.c */ |
153 | void bl_free_block_dev(struct pnfs_block_dev *bdev); | |
154 | ||
03341d2c | 155 | /* extents.c */ |
9e692969 | 156 | void bl_put_extent(struct pnfs_block_extent *be); |
03341d2c FI |
157 | struct pnfs_block_extent *bl_alloc_extent(void); |
158 | int bl_add_merge_extent(struct pnfs_block_layout *bl, | |
159 | struct pnfs_block_extent *new); | |
160 | ||
155e7524 | 161 | #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */ |