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 | ||
155e7524 FI |
39 | #include "../pnfs.h" |
40 | ||
c1c2a4cd FI |
41 | #define PAGE_CACHE_SECTORS (PAGE_CACHE_SIZE >> SECTOR_SHIFT) |
42 | #define PAGE_CACHE_SECTOR_SHIFT (PAGE_CACHE_SHIFT - SECTOR_SHIFT) | |
43 | ||
2f9fd182 FI |
44 | struct block_mount_id { |
45 | spinlock_t bm_lock; /* protects list */ | |
46 | struct list_head bm_devlist; /* holds pnfs_block_dev */ | |
47 | }; | |
48 | ||
fe0a9b74 JR |
49 | struct pnfs_block_dev { |
50 | struct list_head bm_node; | |
51 | struct nfs4_deviceid bm_mdevid; /* associated devid */ | |
52 | struct block_device *bm_mdev; /* meta device itself */ | |
53 | }; | |
54 | ||
155e7524 FI |
55 | enum exstate4 { |
56 | PNFS_BLOCK_READWRITE_DATA = 0, | |
57 | PNFS_BLOCK_READ_DATA = 1, | |
58 | PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */ | |
59 | PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */ | |
60 | }; | |
61 | ||
c1c2a4cd FI |
62 | #define MY_MAX_TAGS (15) /* tag bitnums used must be less than this */ |
63 | ||
64 | struct my_tree { | |
65 | sector_t mtt_step_size; /* Internal sector alignment */ | |
66 | struct list_head mtt_stub; /* Should be a radix tree */ | |
67 | }; | |
68 | ||
155e7524 | 69 | struct pnfs_inval_markings { |
c1c2a4cd FI |
70 | spinlock_t im_lock; |
71 | struct my_tree im_tree; /* Sectors that need LAYOUTCOMMIT */ | |
72 | sector_t im_block_size; /* Server blocksize in sectors */ | |
73 | }; | |
74 | ||
75 | struct pnfs_inval_tracking { | |
76 | struct list_head it_link; | |
77 | int it_sector; | |
78 | int it_tags; | |
155e7524 FI |
79 | }; |
80 | ||
81 | /* sector_t fields are all in 512-byte sectors */ | |
82 | struct pnfs_block_extent { | |
83 | struct kref be_refcnt; | |
84 | struct list_head be_node; /* link into lseg list */ | |
85 | struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */ | |
86 | struct block_device *be_mdev; | |
87 | sector_t be_f_offset; /* the starting offset in the file */ | |
88 | sector_t be_length; /* the size of the extent */ | |
89 | sector_t be_v_offset; /* the starting offset in the volume */ | |
90 | enum exstate4 be_state; /* the state of this extent */ | |
91 | struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */ | |
92 | }; | |
93 | ||
90ace12a FI |
94 | /* Shortened extent used by LAYOUTCOMMIT */ |
95 | struct pnfs_block_short_extent { | |
96 | struct list_head bse_node; | |
97 | struct nfs4_deviceid bse_devid; | |
98 | struct block_device *bse_mdev; | |
99 | sector_t bse_f_offset; /* the starting offset in the file */ | |
100 | sector_t bse_length; /* the size of the extent */ | |
101 | }; | |
102 | ||
155e7524 FI |
103 | static inline void |
104 | BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize) | |
105 | { | |
c1c2a4cd FI |
106 | spin_lock_init(&marks->im_lock); |
107 | INIT_LIST_HEAD(&marks->im_tree.mtt_stub); | |
108 | marks->im_block_size = blocksize; | |
109 | marks->im_tree.mtt_step_size = min((sector_t)PAGE_CACHE_SECTORS, | |
110 | blocksize); | |
155e7524 FI |
111 | } |
112 | ||
113 | enum extentclass4 { | |
114 | RW_EXTENT = 0, /* READWRTE and INVAL */ | |
115 | RO_EXTENT = 1, /* READ and NONE */ | |
116 | EXTENT_LISTS = 2, | |
117 | }; | |
118 | ||
03341d2c FI |
119 | static inline int bl_choose_list(enum exstate4 state) |
120 | { | |
121 | if (state == PNFS_BLOCK_READ_DATA || state == PNFS_BLOCK_NONE_DATA) | |
122 | return RO_EXTENT; | |
123 | else | |
124 | return RW_EXTENT; | |
125 | } | |
126 | ||
155e7524 FI |
127 | struct pnfs_block_layout { |
128 | struct pnfs_layout_hdr bl_layout; | |
129 | struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */ | |
130 | spinlock_t bl_ext_lock; /* Protects list manipulation */ | |
131 | struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */ | |
132 | struct list_head bl_commit; /* Needs layout commit */ | |
133 | struct list_head bl_committing; /* Layout committing */ | |
134 | unsigned int bl_count; /* entries in bl_commit */ | |
135 | sector_t bl_blocksize; /* Server blocksize in sectors */ | |
136 | }; | |
137 | ||
2f9fd182 FI |
138 | #define BLK_ID(lo) ((struct block_mount_id *)(NFS_SERVER(lo->plh_inode)->pnfs_ld_data)) |
139 | ||
140 | static inline struct pnfs_block_layout * | |
141 | BLK_LO2EXT(struct pnfs_layout_hdr *lo) | |
155e7524 FI |
142 | { |
143 | return container_of(lo, struct pnfs_block_layout, bl_layout); | |
144 | } | |
145 | ||
a60d2ebd FI |
146 | static inline struct pnfs_block_layout * |
147 | BLK_LSEG2EXT(struct pnfs_layout_segment *lseg) | |
148 | { | |
149 | return BLK_LO2EXT(lseg->pls_layout); | |
150 | } | |
151 | ||
fe0a9b74 | 152 | struct bl_dev_msg { |
fdc17abb | 153 | int32_t status; |
fe0a9b74 JR |
154 | uint32_t major, minor; |
155 | }; | |
156 | ||
157 | struct bl_msg_hdr { | |
158 | u8 type; | |
159 | u16 totallen; /* length of entire message, including hdr itself */ | |
160 | }; | |
161 | ||
162 | extern struct dentry *bl_device_pipe; | |
163 | extern wait_queue_head_t bl_wq; | |
164 | ||
165 | #define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */ | |
166 | #define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/ | |
167 | #define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */ | |
168 | #define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */ | |
169 | #define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */ | |
170 | ||
171 | /* blocklayoutdev.c */ | |
fe0a9b74 JR |
172 | ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t); |
173 | void bl_pipe_destroy_msg(struct rpc_pipe_msg *); | |
174 | struct block_device *nfs4_blkdev_get(dev_t dev); | |
175 | int nfs4_blkdev_put(struct block_device *bdev); | |
176 | struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server, | |
2f9fd182 | 177 | struct pnfs_device *dev); |
fe0a9b74 JR |
178 | int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo, |
179 | struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); | |
180 | ||
025a70ed JR |
181 | /* blocklayoutdm.c */ |
182 | void bl_free_block_dev(struct pnfs_block_dev *bdev); | |
183 | ||
03341d2c | 184 | /* extents.c */ |
6d742ba5 FI |
185 | struct pnfs_block_extent * |
186 | bl_find_get_extent(struct pnfs_block_layout *bl, sector_t isect, | |
187 | struct pnfs_block_extent **cow_read); | |
c1c2a4cd FI |
188 | int bl_mark_sectors_init(struct pnfs_inval_markings *marks, |
189 | sector_t offset, sector_t length, | |
190 | sector_t **pages); | |
9e692969 | 191 | void bl_put_extent(struct pnfs_block_extent *be); |
03341d2c | 192 | struct pnfs_block_extent *bl_alloc_extent(void); |
c1c2a4cd | 193 | int bl_is_sector_init(struct pnfs_inval_markings *marks, sector_t isect); |
90ace12a FI |
194 | int encode_pnfs_block_layoutupdate(struct pnfs_block_layout *bl, |
195 | struct xdr_stream *xdr, | |
196 | const struct nfs4_layoutcommit_args *arg); | |
b2be7811 FI |
197 | void clean_pnfs_block_layoutupdate(struct pnfs_block_layout *bl, |
198 | const struct nfs4_layoutcommit_args *arg, | |
199 | int status); | |
03341d2c FI |
200 | int bl_add_merge_extent(struct pnfs_block_layout *bl, |
201 | struct pnfs_block_extent *new); | |
31e6306a FI |
202 | int bl_mark_for_commit(struct pnfs_block_extent *be, |
203 | sector_t offset, sector_t length); | |
03341d2c | 204 | |
155e7524 | 205 | #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */ |