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1/*
2 * Copyright (C) 2011 Red Hat, Inc.
3 *
4 * This file is released under the GPL.
5 */
6
7#include "dm-space-map-common.h"
8#include "dm-space-map-disk.h"
9#include "dm-space-map.h"
10#include "dm-transaction-manager.h"
11
12#include <linux/list.h>
13#include <linux/slab.h>
14#include <linux/export.h>
15#include <linux/device-mapper.h>
16
17#define DM_MSG_PREFIX "space map disk"
18
19/*----------------------------------------------------------------*/
20
21/*
22 * Space map interface.
23 */
24struct sm_disk {
25 struct dm_space_map sm;
26
27 struct ll_disk ll;
28 struct ll_disk old_ll;
29
30 dm_block_t begin;
31 dm_block_t nr_allocated_this_transaction;
32};
33
34static void sm_disk_destroy(struct dm_space_map *sm)
35{
36 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
37
38 kfree(smd);
39}
40
41static int sm_disk_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
42{
43 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
44
45 return sm_ll_extend(&smd->ll, extra_blocks);
46}
47
48static int sm_disk_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count)
49{
50 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
51 *count = smd->old_ll.nr_blocks;
52
53 return 0;
54}
55
56static int sm_disk_get_nr_free(struct dm_space_map *sm, dm_block_t *count)
57{
58 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
59 *count = (smd->old_ll.nr_blocks - smd->old_ll.nr_allocated) - smd->nr_allocated_this_transaction;
60
61 return 0;
62}
63
64static int sm_disk_get_count(struct dm_space_map *sm, dm_block_t b,
65 uint32_t *result)
66{
67 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
68 return sm_ll_lookup(&smd->ll, b, result);
69}
70
71static int sm_disk_count_is_more_than_one(struct dm_space_map *sm, dm_block_t b,
72 int *result)
73{
74 int r;
75 uint32_t count;
76
77 r = sm_disk_get_count(sm, b, &count);
78 if (r)
79 return r;
80
81 *result = count > 1;
82
83 return 0;
84}
85
86static int sm_disk_set_count(struct dm_space_map *sm, dm_block_t b,
87 uint32_t count)
88{
89 int r;
90 int32_t nr_allocations;
91 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
92
93 r = sm_ll_insert(&smd->ll, b, count, &nr_allocations);
94 if (!r) {
95 smd->nr_allocated_this_transaction += nr_allocations;
96 }
97
98 return r;
99}
100
101static int sm_disk_inc_blocks(struct dm_space_map *sm, dm_block_t b, dm_block_t e)
102{
103 int r;
104 int32_t nr_allocations;
105 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
106
107 r = sm_ll_inc(&smd->ll, b, e, &nr_allocations);
108 if (!r)
109 smd->nr_allocated_this_transaction += nr_allocations;
110
111 return r;
112}
113
114static int sm_disk_dec_blocks(struct dm_space_map *sm, dm_block_t b, dm_block_t e)
115{
116 int r;
117 int32_t nr_allocations;
118 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
119
120 r = sm_ll_dec(&smd->ll, b, e, &nr_allocations);
121 if (!r)
122 smd->nr_allocated_this_transaction += nr_allocations;
123
124 return r;
125}
126
127static int sm_disk_new_block(struct dm_space_map *sm, dm_block_t *b)
128{
129 int r;
130 int32_t nr_allocations;
131 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
132
133 /*
134 * Any block we allocate has to be free in both the old and current ll.
135 */
136 r = sm_ll_find_common_free_block(&smd->old_ll, &smd->ll, smd->begin, smd->ll.nr_blocks, b);
137 if (r == -ENOSPC) {
138 /*
139 * There's no free block between smd->begin and the end of the metadata device.
140 * We search before smd->begin in case something has been freed.
141 */
142 r = sm_ll_find_common_free_block(&smd->old_ll, &smd->ll, 0, smd->begin, b);
143 }
144
145 if (r)
146 return r;
147
148 smd->begin = *b + 1;
149 r = sm_ll_inc(&smd->ll, *b, *b + 1, &nr_allocations);
150 if (!r) {
151 smd->nr_allocated_this_transaction += nr_allocations;
152 }
153
154 return r;
155}
156
157static int sm_disk_commit(struct dm_space_map *sm)
158{
159 int r;
160 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
161
162 r = sm_ll_commit(&smd->ll);
163 if (r)
164 return r;
165
166 memcpy(&smd->old_ll, &smd->ll, sizeof(smd->old_ll));
167 smd->nr_allocated_this_transaction = 0;
168
169 return 0;
170}
171
172static int sm_disk_root_size(struct dm_space_map *sm, size_t *result)
173{
174 *result = sizeof(struct disk_sm_root);
175
176 return 0;
177}
178
179static int sm_disk_copy_root(struct dm_space_map *sm, void *where_le, size_t max)
180{
181 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
182 struct disk_sm_root root_le;
183
184 root_le.nr_blocks = cpu_to_le64(smd->ll.nr_blocks);
185 root_le.nr_allocated = cpu_to_le64(smd->ll.nr_allocated);
186 root_le.bitmap_root = cpu_to_le64(smd->ll.bitmap_root);
187 root_le.ref_count_root = cpu_to_le64(smd->ll.ref_count_root);
188
189 if (max < sizeof(root_le))
190 return -ENOSPC;
191
192 memcpy(where_le, &root_le, sizeof(root_le));
193
194 return 0;
195}
196
197/*----------------------------------------------------------------*/
198
199static struct dm_space_map ops = {
200 .destroy = sm_disk_destroy,
201 .extend = sm_disk_extend,
202 .get_nr_blocks = sm_disk_get_nr_blocks,
203 .get_nr_free = sm_disk_get_nr_free,
204 .get_count = sm_disk_get_count,
205 .count_is_more_than_one = sm_disk_count_is_more_than_one,
206 .set_count = sm_disk_set_count,
207 .inc_blocks = sm_disk_inc_blocks,
208 .dec_blocks = sm_disk_dec_blocks,
209 .new_block = sm_disk_new_block,
210 .commit = sm_disk_commit,
211 .root_size = sm_disk_root_size,
212 .copy_root = sm_disk_copy_root,
213 .register_threshold_callback = NULL
214};
215
216struct dm_space_map *dm_sm_disk_create(struct dm_transaction_manager *tm,
217 dm_block_t nr_blocks)
218{
219 int r;
220 struct sm_disk *smd;
221
222 smd = kmalloc(sizeof(*smd), GFP_KERNEL);
223 if (!smd)
224 return ERR_PTR(-ENOMEM);
225
226 smd->begin = 0;
227 smd->nr_allocated_this_transaction = 0;
228 memcpy(&smd->sm, &ops, sizeof(smd->sm));
229
230 r = sm_ll_new_disk(&smd->ll, tm);
231 if (r)
232 goto bad;
233
234 r = sm_ll_extend(&smd->ll, nr_blocks);
235 if (r)
236 goto bad;
237
238 r = sm_disk_commit(&smd->sm);
239 if (r)
240 goto bad;
241
242 return &smd->sm;
243
244bad:
245 kfree(smd);
246 return ERR_PTR(r);
247}
248EXPORT_SYMBOL_GPL(dm_sm_disk_create);
249
250struct dm_space_map *dm_sm_disk_open(struct dm_transaction_manager *tm,
251 void *root_le, size_t len)
252{
253 int r;
254 struct sm_disk *smd;
255
256 smd = kmalloc(sizeof(*smd), GFP_KERNEL);
257 if (!smd)
258 return ERR_PTR(-ENOMEM);
259
260 smd->begin = 0;
261 smd->nr_allocated_this_transaction = 0;
262 memcpy(&smd->sm, &ops, sizeof(smd->sm));
263
264 r = sm_ll_open_disk(&smd->ll, tm, root_le, len);
265 if (r)
266 goto bad;
267
268 r = sm_disk_commit(&smd->sm);
269 if (r)
270 goto bad;
271
272 return &smd->sm;
273
274bad:
275 kfree(smd);
276 return ERR_PTR(r);
277}
278EXPORT_SYMBOL_GPL(dm_sm_disk_open);
279
280/*----------------------------------------------------------------*/
1/*
2 * Copyright (C) 2011 Red Hat, Inc.
3 *
4 * This file is released under the GPL.
5 */
6
7#include "dm-space-map-common.h"
8#include "dm-space-map-disk.h"
9#include "dm-space-map.h"
10#include "dm-transaction-manager.h"
11
12#include <linux/list.h>
13#include <linux/slab.h>
14#include <linux/export.h>
15#include <linux/device-mapper.h>
16
17#define DM_MSG_PREFIX "space map disk"
18
19/*----------------------------------------------------------------*/
20
21/*
22 * Space map interface.
23 */
24struct sm_disk {
25 struct dm_space_map sm;
26
27 struct ll_disk ll;
28 struct ll_disk old_ll;
29
30 dm_block_t begin;
31 dm_block_t nr_allocated_this_transaction;
32};
33
34static void sm_disk_destroy(struct dm_space_map *sm)
35{
36 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
37
38 kfree(smd);
39}
40
41static int sm_disk_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
42{
43 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
44
45 return sm_ll_extend(&smd->ll, extra_blocks);
46}
47
48static int sm_disk_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count)
49{
50 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
51 *count = smd->old_ll.nr_blocks;
52
53 return 0;
54}
55
56static int sm_disk_get_nr_free(struct dm_space_map *sm, dm_block_t *count)
57{
58 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
59 *count = (smd->old_ll.nr_blocks - smd->old_ll.nr_allocated) - smd->nr_allocated_this_transaction;
60
61 return 0;
62}
63
64static int sm_disk_get_count(struct dm_space_map *sm, dm_block_t b,
65 uint32_t *result)
66{
67 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
68 return sm_ll_lookup(&smd->ll, b, result);
69}
70
71static int sm_disk_count_is_more_than_one(struct dm_space_map *sm, dm_block_t b,
72 int *result)
73{
74 int r;
75 uint32_t count;
76
77 r = sm_disk_get_count(sm, b, &count);
78 if (r)
79 return r;
80
81 *result = count > 1;
82
83 return 0;
84}
85
86static int sm_disk_set_count(struct dm_space_map *sm, dm_block_t b,
87 uint32_t count)
88{
89 int r;
90 uint32_t old_count;
91 enum allocation_event ev;
92 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
93
94 r = sm_ll_insert(&smd->ll, b, count, &ev);
95 if (!r) {
96 switch (ev) {
97 case SM_NONE:
98 break;
99
100 case SM_ALLOC:
101 /*
102 * This _must_ be free in the prior transaction
103 * otherwise we've lost atomicity.
104 */
105 smd->nr_allocated_this_transaction++;
106 break;
107
108 case SM_FREE:
109 /*
110 * It's only free if it's also free in the last
111 * transaction.
112 */
113 r = sm_ll_lookup(&smd->old_ll, b, &old_count);
114 if (r)
115 return r;
116
117 if (!old_count)
118 smd->nr_allocated_this_transaction--;
119 break;
120 }
121 }
122
123 return r;
124}
125
126static int sm_disk_inc_block(struct dm_space_map *sm, dm_block_t b)
127{
128 int r;
129 enum allocation_event ev;
130 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
131
132 r = sm_ll_inc(&smd->ll, b, &ev);
133 if (!r && (ev == SM_ALLOC))
134 /*
135 * This _must_ be free in the prior transaction
136 * otherwise we've lost atomicity.
137 */
138 smd->nr_allocated_this_transaction++;
139
140 return r;
141}
142
143static int sm_disk_dec_block(struct dm_space_map *sm, dm_block_t b)
144{
145 enum allocation_event ev;
146 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
147
148 return sm_ll_dec(&smd->ll, b, &ev);
149}
150
151static int sm_disk_new_block(struct dm_space_map *sm, dm_block_t *b)
152{
153 int r;
154 enum allocation_event ev;
155 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
156
157 /* FIXME: we should loop round a couple of times */
158 r = sm_ll_find_free_block(&smd->old_ll, smd->begin, smd->old_ll.nr_blocks, b);
159 if (r)
160 return r;
161
162 smd->begin = *b + 1;
163 r = sm_ll_inc(&smd->ll, *b, &ev);
164 if (!r) {
165 BUG_ON(ev != SM_ALLOC);
166 smd->nr_allocated_this_transaction++;
167 }
168
169 return r;
170}
171
172static int sm_disk_commit(struct dm_space_map *sm)
173{
174 int r;
175 dm_block_t nr_free;
176 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
177
178 r = sm_disk_get_nr_free(sm, &nr_free);
179 if (r)
180 return r;
181
182 r = sm_ll_commit(&smd->ll);
183 if (r)
184 return r;
185
186 memcpy(&smd->old_ll, &smd->ll, sizeof(smd->old_ll));
187 smd->begin = 0;
188 smd->nr_allocated_this_transaction = 0;
189
190 r = sm_disk_get_nr_free(sm, &nr_free);
191 if (r)
192 return r;
193
194 return 0;
195}
196
197static int sm_disk_root_size(struct dm_space_map *sm, size_t *result)
198{
199 *result = sizeof(struct disk_sm_root);
200
201 return 0;
202}
203
204static int sm_disk_copy_root(struct dm_space_map *sm, void *where_le, size_t max)
205{
206 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
207 struct disk_sm_root root_le;
208
209 root_le.nr_blocks = cpu_to_le64(smd->ll.nr_blocks);
210 root_le.nr_allocated = cpu_to_le64(smd->ll.nr_allocated);
211 root_le.bitmap_root = cpu_to_le64(smd->ll.bitmap_root);
212 root_le.ref_count_root = cpu_to_le64(smd->ll.ref_count_root);
213
214 if (max < sizeof(root_le))
215 return -ENOSPC;
216
217 memcpy(where_le, &root_le, sizeof(root_le));
218
219 return 0;
220}
221
222/*----------------------------------------------------------------*/
223
224static struct dm_space_map ops = {
225 .destroy = sm_disk_destroy,
226 .extend = sm_disk_extend,
227 .get_nr_blocks = sm_disk_get_nr_blocks,
228 .get_nr_free = sm_disk_get_nr_free,
229 .get_count = sm_disk_get_count,
230 .count_is_more_than_one = sm_disk_count_is_more_than_one,
231 .set_count = sm_disk_set_count,
232 .inc_block = sm_disk_inc_block,
233 .dec_block = sm_disk_dec_block,
234 .new_block = sm_disk_new_block,
235 .commit = sm_disk_commit,
236 .root_size = sm_disk_root_size,
237 .copy_root = sm_disk_copy_root,
238 .register_threshold_callback = NULL
239};
240
241struct dm_space_map *dm_sm_disk_create(struct dm_transaction_manager *tm,
242 dm_block_t nr_blocks)
243{
244 int r;
245 struct sm_disk *smd;
246
247 smd = kmalloc(sizeof(*smd), GFP_KERNEL);
248 if (!smd)
249 return ERR_PTR(-ENOMEM);
250
251 smd->begin = 0;
252 smd->nr_allocated_this_transaction = 0;
253 memcpy(&smd->sm, &ops, sizeof(smd->sm));
254
255 r = sm_ll_new_disk(&smd->ll, tm);
256 if (r)
257 goto bad;
258
259 r = sm_ll_extend(&smd->ll, nr_blocks);
260 if (r)
261 goto bad;
262
263 r = sm_disk_commit(&smd->sm);
264 if (r)
265 goto bad;
266
267 return &smd->sm;
268
269bad:
270 kfree(smd);
271 return ERR_PTR(r);
272}
273EXPORT_SYMBOL_GPL(dm_sm_disk_create);
274
275struct dm_space_map *dm_sm_disk_open(struct dm_transaction_manager *tm,
276 void *root_le, size_t len)
277{
278 int r;
279 struct sm_disk *smd;
280
281 smd = kmalloc(sizeof(*smd), GFP_KERNEL);
282 if (!smd)
283 return ERR_PTR(-ENOMEM);
284
285 smd->begin = 0;
286 smd->nr_allocated_this_transaction = 0;
287 memcpy(&smd->sm, &ops, sizeof(smd->sm));
288
289 r = sm_ll_open_disk(&smd->ll, tm, root_le, len);
290 if (r)
291 goto bad;
292
293 r = sm_disk_commit(&smd->sm);
294 if (r)
295 goto bad;
296
297 return &smd->sm;
298
299bad:
300 kfree(smd);
301 return ERR_PTR(r);
302}
303EXPORT_SYMBOL_GPL(dm_sm_disk_open);
304
305/*----------------------------------------------------------------*/