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991d9fa0 JT |
1 | /* |
2 | * Copyright (C) 2010-2011 Red Hat, Inc. | |
3 | * | |
4 | * This file is released under the GPL. | |
5 | */ | |
6 | ||
7 | #ifndef DM_THIN_METADATA_H | |
8 | #define DM_THIN_METADATA_H | |
9 | ||
10 | #include "persistent-data/dm-block-manager.h" | |
ac8c3f3d | 11 | #include "persistent-data/dm-space-map.h" |
7d48935e | 12 | #include "persistent-data/dm-space-map-metadata.h" |
991d9fa0 | 13 | |
7d48935e | 14 | #define THIN_METADATA_BLOCK_SIZE DM_SM_METADATA_BLOCK_SIZE |
991d9fa0 | 15 | |
c4a69ecd MS |
16 | /* |
17 | * The metadata device is currently limited in size. | |
c4a69ecd | 18 | */ |
7d48935e | 19 | #define THIN_METADATA_MAX_SECTORS DM_SM_METADATA_MAX_SECTORS |
c4a69ecd MS |
20 | |
21 | /* | |
22 | * A metadata device larger than 16GB triggers a warning. | |
23 | */ | |
24 | #define THIN_METADATA_MAX_SECTORS_WARNING (16 * (1024 * 1024 * 1024 >> SECTOR_SHIFT)) | |
25 | ||
991d9fa0 JT |
26 | /*----------------------------------------------------------------*/ |
27 | ||
07f2b6e0 MS |
28 | /* |
29 | * Thin metadata superblock flags. | |
30 | */ | |
31 | #define THIN_METADATA_NEEDS_CHECK_FLAG (1 << 0) | |
32 | ||
991d9fa0 JT |
33 | struct dm_pool_metadata; |
34 | struct dm_thin_device; | |
35 | ||
36 | /* | |
37 | * Device identifier | |
38 | */ | |
39 | typedef uint64_t dm_thin_id; | |
40 | ||
41 | /* | |
42 | * Reopens or creates a new, empty metadata volume. | |
43 | */ | |
44 | struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, | |
66b1edc0 JT |
45 | sector_t data_block_size, |
46 | bool format_device); | |
991d9fa0 JT |
47 | |
48 | int dm_pool_metadata_close(struct dm_pool_metadata *pmd); | |
49 | ||
50 | /* | |
51 | * Compat feature flags. Any incompat flags beyond the ones | |
52 | * specified below will prevent use of the thin metadata. | |
53 | */ | |
54 | #define THIN_FEATURE_COMPAT_SUPP 0UL | |
55 | #define THIN_FEATURE_COMPAT_RO_SUPP 0UL | |
56 | #define THIN_FEATURE_INCOMPAT_SUPP 0UL | |
57 | ||
58 | /* | |
59 | * Device creation/deletion. | |
60 | */ | |
61 | int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev); | |
62 | ||
63 | /* | |
64 | * An internal snapshot. | |
65 | * | |
66 | * You can only snapshot a quiesced origin i.e. one that is either | |
67 | * suspended or not instanced at all. | |
68 | */ | |
69 | int dm_pool_create_snap(struct dm_pool_metadata *pmd, dm_thin_id dev, | |
70 | dm_thin_id origin); | |
71 | ||
72 | /* | |
73 | * Deletes a virtual device from the metadata. It _is_ safe to call this | |
74 | * when that device is open. Operations on that device will just start | |
75 | * failing. You still need to call close() on the device. | |
76 | */ | |
77 | int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, | |
78 | dm_thin_id dev); | |
79 | ||
80 | /* | |
81 | * Commits _all_ metadata changes: device creation, deletion, mapping | |
82 | * updates. | |
83 | */ | |
84 | int dm_pool_commit_metadata(struct dm_pool_metadata *pmd); | |
85 | ||
da105ed5 JT |
86 | /* |
87 | * Discards all uncommitted changes. Rereads the superblock, rolling back | |
88 | * to the last good transaction. Thin devices remain open. | |
89 | * dm_thin_aborted_changes() tells you if they had uncommitted changes. | |
90 | * | |
91 | * If this call fails it's only useful to call dm_pool_metadata_close(). | |
92 | * All other methods will fail with -EINVAL. | |
93 | */ | |
94 | int dm_pool_abort_metadata(struct dm_pool_metadata *pmd); | |
95 | ||
991d9fa0 JT |
96 | /* |
97 | * Set/get userspace transaction id. | |
98 | */ | |
99 | int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
100 | uint64_t current_id, | |
101 | uint64_t new_id); | |
102 | ||
103 | int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, | |
104 | uint64_t *result); | |
105 | ||
106 | /* | |
107 | * Hold/get root for userspace transaction. | |
cc8394d8 JT |
108 | * |
109 | * The metadata snapshot is a copy of the current superblock (minus the | |
110 | * space maps). Userland can access the data structures for READ | |
111 | * operations only. A small performance hit is incurred by providing this | |
112 | * copy of the metadata to userland due to extra copy-on-write operations | |
113 | * on the metadata nodes. Release this as soon as you finish with it. | |
991d9fa0 | 114 | */ |
cc8394d8 JT |
115 | int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd); |
116 | int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd); | |
991d9fa0 | 117 | |
cc8394d8 JT |
118 | int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd, |
119 | dm_block_t *result); | |
991d9fa0 JT |
120 | |
121 | /* | |
122 | * Actions on a single virtual device. | |
123 | */ | |
124 | ||
125 | /* | |
126 | * Opening the same device more than once will fail with -EBUSY. | |
127 | */ | |
128 | int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, | |
129 | struct dm_thin_device **td); | |
130 | ||
131 | int dm_pool_close_thin_device(struct dm_thin_device *td); | |
132 | ||
133 | dm_thin_id dm_thin_dev_id(struct dm_thin_device *td); | |
134 | ||
135 | struct dm_thin_lookup_result { | |
136 | dm_block_t block; | |
7f214665 | 137 | bool shared:1; |
991d9fa0 JT |
138 | }; |
139 | ||
140 | /* | |
141 | * Returns: | |
e5cfc69a | 142 | * -EWOULDBLOCK iff @can_issue_io is set and would issue IO |
991d9fa0 JT |
143 | * -ENODATA iff that mapping is not present. |
144 | * 0 success | |
145 | */ | |
146 | int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, | |
e5cfc69a | 147 | int can_issue_io, struct dm_thin_lookup_result *result); |
991d9fa0 | 148 | |
a5d895a9 JT |
149 | /* |
150 | * Retrieve the next run of contiguously mapped blocks. Useful for working | |
151 | * out where to break up IO. Returns 0 on success, < 0 on error. | |
152 | */ | |
153 | int dm_thin_find_mapped_range(struct dm_thin_device *td, | |
154 | dm_block_t begin, dm_block_t end, | |
155 | dm_block_t *thin_begin, dm_block_t *thin_end, | |
156 | dm_block_t *pool_begin, bool *maybe_shared); | |
157 | ||
991d9fa0 JT |
158 | /* |
159 | * Obtain an unused block. | |
160 | */ | |
161 | int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result); | |
162 | ||
163 | /* | |
164 | * Insert or remove block. | |
165 | */ | |
166 | int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, | |
167 | dm_block_t data_block); | |
168 | ||
169 | int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block); | |
6550f075 JT |
170 | int dm_thin_remove_range(struct dm_thin_device *td, |
171 | dm_block_t begin, dm_block_t end); | |
991d9fa0 JT |
172 | |
173 | /* | |
174 | * Queries. | |
175 | */ | |
40db5a53 JT |
176 | bool dm_thin_changed_this_transaction(struct dm_thin_device *td); |
177 | ||
4d1662a3 MS |
178 | bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd); |
179 | ||
da105ed5 JT |
180 | bool dm_thin_aborted_changes(struct dm_thin_device *td); |
181 | ||
991d9fa0 JT |
182 | int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, |
183 | dm_block_t *highest_mapped); | |
184 | ||
185 | int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result); | |
186 | ||
187 | int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, | |
188 | dm_block_t *result); | |
189 | ||
190 | int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, | |
191 | dm_block_t *result); | |
192 | ||
193 | int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, | |
194 | dm_block_t *result); | |
195 | ||
991d9fa0 JT |
196 | int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result); |
197 | ||
d445bd9c | 198 | int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result); |
2a0fbffb JT |
199 | |
200 | int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e); | |
201 | int dm_pool_dec_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e); | |
19fa1a67 | 202 | |
991d9fa0 JT |
203 | /* |
204 | * Returns -ENOSPC if the new size is too small and already allocated | |
205 | * blocks would be lost. | |
206 | */ | |
207 | int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_size); | |
24347e95 | 208 | int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_size); |
991d9fa0 | 209 | |
12ba58af JT |
210 | /* |
211 | * Flicks the underlying block manager into read only mode, so you know | |
212 | * that nothing is changing. | |
213 | */ | |
214 | void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd); | |
9b7aaa64 | 215 | void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd); |
12ba58af | 216 | |
ac8c3f3d JT |
217 | int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, |
218 | dm_block_t threshold, | |
219 | dm_sm_threshold_fn fn, | |
220 | void *context); | |
221 | ||
07f2b6e0 MS |
222 | /* |
223 | * Updates the superblock immediately. | |
224 | */ | |
225 | int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd); | |
226 | bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd); | |
227 | ||
8a01a6af JT |
228 | /* |
229 | * Issue any prefetches that may be useful. | |
230 | */ | |
231 | void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd); | |
232 | ||
ecda7c02 NT |
233 | /* Pre-commit callback */ |
234 | typedef int (*dm_pool_pre_commit_fn)(void *context); | |
235 | ||
236 | void dm_pool_register_pre_commit_callback(struct dm_pool_metadata *pmd, | |
237 | dm_pool_pre_commit_fn fn, | |
238 | void *context); | |
239 | ||
991d9fa0 JT |
240 | /*----------------------------------------------------------------*/ |
241 | ||
242 | #endif |