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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 | 39 | #include "../pnfs.h" |
9e2e74db | 40 | #include "../netns.h" |
155e7524 | 41 | |
c1c2a4cd FI |
42 | #define PAGE_CACHE_SECTORS (PAGE_CACHE_SIZE >> SECTOR_SHIFT) |
43 | #define PAGE_CACHE_SECTOR_SHIFT (PAGE_CACHE_SHIFT - SECTOR_SHIFT) | |
fe6e1e8d | 44 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) |
c1c2a4cd | 45 | |
2f9fd182 FI |
46 | struct block_mount_id { |
47 | spinlock_t bm_lock; /* protects list */ | |
48 | struct list_head bm_devlist; /* holds pnfs_block_dev */ | |
49 | }; | |
50 | ||
fe0a9b74 JR |
51 | struct pnfs_block_dev { |
52 | struct list_head bm_node; | |
53 | struct nfs4_deviceid bm_mdevid; /* associated devid */ | |
54 | struct block_device *bm_mdev; /* meta device itself */ | |
9e2e74db | 55 | struct net *net; |
fe0a9b74 JR |
56 | }; |
57 | ||
155e7524 FI |
58 | enum exstate4 { |
59 | PNFS_BLOCK_READWRITE_DATA = 0, | |
60 | PNFS_BLOCK_READ_DATA = 1, | |
61 | PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */ | |
62 | PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */ | |
63 | }; | |
64 | ||
c1c2a4cd FI |
65 | #define MY_MAX_TAGS (15) /* tag bitnums used must be less than this */ |
66 | ||
67 | struct my_tree { | |
68 | sector_t mtt_step_size; /* Internal sector alignment */ | |
69 | struct list_head mtt_stub; /* Should be a radix tree */ | |
70 | }; | |
71 | ||
155e7524 | 72 | struct pnfs_inval_markings { |
c1c2a4cd FI |
73 | spinlock_t im_lock; |
74 | struct my_tree im_tree; /* Sectors that need LAYOUTCOMMIT */ | |
75 | sector_t im_block_size; /* Server blocksize in sectors */ | |
7c5465d6 | 76 | struct list_head im_extents; /* Short extents for INVAL->RW conversion */ |
c1c2a4cd FI |
77 | }; |
78 | ||
79 | struct pnfs_inval_tracking { | |
80 | struct list_head it_link; | |
81 | int it_sector; | |
82 | int it_tags; | |
155e7524 FI |
83 | }; |
84 | ||
85 | /* sector_t fields are all in 512-byte sectors */ | |
86 | struct pnfs_block_extent { | |
87 | struct kref be_refcnt; | |
88 | struct list_head be_node; /* link into lseg list */ | |
89 | struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */ | |
90 | struct block_device *be_mdev; | |
91 | sector_t be_f_offset; /* the starting offset in the file */ | |
92 | sector_t be_length; /* the size of the extent */ | |
93 | sector_t be_v_offset; /* the starting offset in the volume */ | |
94 | enum exstate4 be_state; /* the state of this extent */ | |
95 | struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */ | |
96 | }; | |
97 | ||
90ace12a FI |
98 | /* Shortened extent used by LAYOUTCOMMIT */ |
99 | struct pnfs_block_short_extent { | |
100 | struct list_head bse_node; | |
101 | struct nfs4_deviceid bse_devid; | |
102 | struct block_device *bse_mdev; | |
103 | sector_t bse_f_offset; /* the starting offset in the file */ | |
104 | sector_t bse_length; /* the size of the extent */ | |
105 | }; | |
106 | ||
155e7524 FI |
107 | static inline void |
108 | BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize) | |
109 | { | |
c1c2a4cd FI |
110 | spin_lock_init(&marks->im_lock); |
111 | INIT_LIST_HEAD(&marks->im_tree.mtt_stub); | |
7c5465d6 | 112 | INIT_LIST_HEAD(&marks->im_extents); |
c1c2a4cd FI |
113 | marks->im_block_size = blocksize; |
114 | marks->im_tree.mtt_step_size = min((sector_t)PAGE_CACHE_SECTORS, | |
115 | blocksize); | |
155e7524 FI |
116 | } |
117 | ||
118 | enum extentclass4 { | |
119 | RW_EXTENT = 0, /* READWRTE and INVAL */ | |
120 | RO_EXTENT = 1, /* READ and NONE */ | |
121 | EXTENT_LISTS = 2, | |
122 | }; | |
123 | ||
03341d2c FI |
124 | static inline int bl_choose_list(enum exstate4 state) |
125 | { | |
126 | if (state == PNFS_BLOCK_READ_DATA || state == PNFS_BLOCK_NONE_DATA) | |
127 | return RO_EXTENT; | |
128 | else | |
129 | return RW_EXTENT; | |
130 | } | |
131 | ||
155e7524 FI |
132 | struct pnfs_block_layout { |
133 | struct pnfs_layout_hdr bl_layout; | |
134 | struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */ | |
135 | spinlock_t bl_ext_lock; /* Protects list manipulation */ | |
136 | struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */ | |
137 | struct list_head bl_commit; /* Needs layout commit */ | |
138 | struct list_head bl_committing; /* Layout committing */ | |
139 | unsigned int bl_count; /* entries in bl_commit */ | |
140 | sector_t bl_blocksize; /* Server blocksize in sectors */ | |
141 | }; | |
142 | ||
2f9fd182 FI |
143 | #define BLK_ID(lo) ((struct block_mount_id *)(NFS_SERVER(lo->plh_inode)->pnfs_ld_data)) |
144 | ||
145 | static inline struct pnfs_block_layout * | |
146 | BLK_LO2EXT(struct pnfs_layout_hdr *lo) | |
155e7524 FI |
147 | { |
148 | return container_of(lo, struct pnfs_block_layout, bl_layout); | |
149 | } | |
150 | ||
a60d2ebd FI |
151 | static inline struct pnfs_block_layout * |
152 | BLK_LSEG2EXT(struct pnfs_layout_segment *lseg) | |
153 | { | |
154 | return BLK_LO2EXT(lseg->pls_layout); | |
155 | } | |
156 | ||
5ffaf855 SK |
157 | struct bl_pipe_msg { |
158 | struct rpc_pipe_msg msg; | |
159 | wait_queue_head_t *bl_wq; | |
160 | }; | |
161 | ||
fe0a9b74 JR |
162 | struct bl_msg_hdr { |
163 | u8 type; | |
164 | u16 totallen; /* length of entire message, including hdr itself */ | |
165 | }; | |
166 | ||
fe0a9b74 JR |
167 | #define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */ |
168 | #define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/ | |
169 | #define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */ | |
170 | #define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */ | |
171 | #define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */ | |
172 | ||
173 | /* blocklayoutdev.c */ | |
fe0a9b74 JR |
174 | ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t); |
175 | void bl_pipe_destroy_msg(struct rpc_pipe_msg *); | |
176 | struct block_device *nfs4_blkdev_get(dev_t dev); | |
177 | int nfs4_blkdev_put(struct block_device *bdev); | |
178 | struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server, | |
2f9fd182 | 179 | struct pnfs_device *dev); |
fe0a9b74 JR |
180 | int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo, |
181 | struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); | |
182 | ||
025a70ed JR |
183 | /* blocklayoutdm.c */ |
184 | void bl_free_block_dev(struct pnfs_block_dev *bdev); | |
185 | ||
03341d2c | 186 | /* extents.c */ |
6d742ba5 FI |
187 | struct pnfs_block_extent * |
188 | bl_find_get_extent(struct pnfs_block_layout *bl, sector_t isect, | |
189 | struct pnfs_block_extent **cow_read); | |
c1c2a4cd | 190 | int bl_mark_sectors_init(struct pnfs_inval_markings *marks, |
60c52e3a | 191 | sector_t offset, sector_t length); |
9e692969 | 192 | void bl_put_extent(struct pnfs_block_extent *be); |
03341d2c | 193 | struct pnfs_block_extent *bl_alloc_extent(void); |
c1c2a4cd | 194 | int bl_is_sector_init(struct pnfs_inval_markings *marks, sector_t isect); |
90ace12a FI |
195 | int encode_pnfs_block_layoutupdate(struct pnfs_block_layout *bl, |
196 | struct xdr_stream *xdr, | |
197 | const struct nfs4_layoutcommit_args *arg); | |
b2be7811 FI |
198 | void clean_pnfs_block_layoutupdate(struct pnfs_block_layout *bl, |
199 | const struct nfs4_layoutcommit_args *arg, | |
200 | int status); | |
03341d2c FI |
201 | int bl_add_merge_extent(struct pnfs_block_layout *bl, |
202 | struct pnfs_block_extent *new); | |
31e6306a | 203 | int bl_mark_for_commit(struct pnfs_block_extent *be, |
7c5465d6 PT |
204 | sector_t offset, sector_t length, |
205 | struct pnfs_block_short_extent *new); | |
206 | int bl_push_one_short_extent(struct pnfs_inval_markings *marks); | |
207 | struct pnfs_block_short_extent * | |
208 | bl_pop_one_short_extent(struct pnfs_inval_markings *marks); | |
209 | void bl_free_short_extents(struct pnfs_inval_markings *marks, int num_to_free); | |
03341d2c | 210 | |
155e7524 | 211 | #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */ |