This source file includes following definitions.
- sm_disk_destroy
- sm_disk_extend
- sm_disk_get_nr_blocks
- sm_disk_get_nr_free
- sm_disk_get_count
- sm_disk_count_is_more_than_one
- sm_disk_set_count
- sm_disk_inc_block
- sm_disk_dec_block
- sm_disk_new_block
- sm_disk_commit
- sm_disk_root_size
- sm_disk_copy_root
- dm_sm_disk_create
- dm_sm_disk_open
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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
23
24 struct 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
34 static 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
41 static 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
48 static 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
56 static 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
64 static 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
71 static 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
86 static 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
103
104
105 smd->nr_allocated_this_transaction++;
106 break;
107
108 case SM_FREE:
109
110
111
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
126 static 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
136
137
138 smd->nr_allocated_this_transaction++;
139
140 return r;
141 }
142
143 static int sm_disk_dec_block(struct dm_space_map *sm, dm_block_t b)
144 {
145 int r;
146 uint32_t old_count;
147 enum allocation_event ev;
148 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
149
150 r = sm_ll_dec(&smd->ll, b, &ev);
151 if (!r && (ev == SM_FREE)) {
152
153
154
155
156 r = sm_ll_lookup(&smd->old_ll, b, &old_count);
157 if (!r && !old_count)
158 smd->nr_allocated_this_transaction--;
159 }
160
161 return r;
162 }
163
164 static int sm_disk_new_block(struct dm_space_map *sm, dm_block_t *b)
165 {
166 int r;
167 enum allocation_event ev;
168 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
169
170
171
172
173 r = sm_ll_find_common_free_block(&smd->old_ll, &smd->ll, smd->begin, smd->ll.nr_blocks, b);
174 if (r)
175 return r;
176
177 smd->begin = *b + 1;
178 r = sm_ll_inc(&smd->ll, *b, &ev);
179 if (!r) {
180 BUG_ON(ev != SM_ALLOC);
181 smd->nr_allocated_this_transaction++;
182 }
183
184 return r;
185 }
186
187 static int sm_disk_commit(struct dm_space_map *sm)
188 {
189 int r;
190 dm_block_t nr_free;
191 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
192
193 r = sm_disk_get_nr_free(sm, &nr_free);
194 if (r)
195 return r;
196
197 r = sm_ll_commit(&smd->ll);
198 if (r)
199 return r;
200
201 memcpy(&smd->old_ll, &smd->ll, sizeof(smd->old_ll));
202 smd->begin = 0;
203 smd->nr_allocated_this_transaction = 0;
204
205 r = sm_disk_get_nr_free(sm, &nr_free);
206 if (r)
207 return r;
208
209 return 0;
210 }
211
212 static int sm_disk_root_size(struct dm_space_map *sm, size_t *result)
213 {
214 *result = sizeof(struct disk_sm_root);
215
216 return 0;
217 }
218
219 static int sm_disk_copy_root(struct dm_space_map *sm, void *where_le, size_t max)
220 {
221 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
222 struct disk_sm_root root_le;
223
224 root_le.nr_blocks = cpu_to_le64(smd->ll.nr_blocks);
225 root_le.nr_allocated = cpu_to_le64(smd->ll.nr_allocated);
226 root_le.bitmap_root = cpu_to_le64(smd->ll.bitmap_root);
227 root_le.ref_count_root = cpu_to_le64(smd->ll.ref_count_root);
228
229 if (max < sizeof(root_le))
230 return -ENOSPC;
231
232 memcpy(where_le, &root_le, sizeof(root_le));
233
234 return 0;
235 }
236
237
238
239 static struct dm_space_map ops = {
240 .destroy = sm_disk_destroy,
241 .extend = sm_disk_extend,
242 .get_nr_blocks = sm_disk_get_nr_blocks,
243 .get_nr_free = sm_disk_get_nr_free,
244 .get_count = sm_disk_get_count,
245 .count_is_more_than_one = sm_disk_count_is_more_than_one,
246 .set_count = sm_disk_set_count,
247 .inc_block = sm_disk_inc_block,
248 .dec_block = sm_disk_dec_block,
249 .new_block = sm_disk_new_block,
250 .commit = sm_disk_commit,
251 .root_size = sm_disk_root_size,
252 .copy_root = sm_disk_copy_root,
253 .register_threshold_callback = NULL
254 };
255
256 struct dm_space_map *dm_sm_disk_create(struct dm_transaction_manager *tm,
257 dm_block_t nr_blocks)
258 {
259 int r;
260 struct sm_disk *smd;
261
262 smd = kmalloc(sizeof(*smd), GFP_KERNEL);
263 if (!smd)
264 return ERR_PTR(-ENOMEM);
265
266 smd->begin = 0;
267 smd->nr_allocated_this_transaction = 0;
268 memcpy(&smd->sm, &ops, sizeof(smd->sm));
269
270 r = sm_ll_new_disk(&smd->ll, tm);
271 if (r)
272 goto bad;
273
274 r = sm_ll_extend(&smd->ll, nr_blocks);
275 if (r)
276 goto bad;
277
278 r = sm_disk_commit(&smd->sm);
279 if (r)
280 goto bad;
281
282 return &smd->sm;
283
284 bad:
285 kfree(smd);
286 return ERR_PTR(r);
287 }
288 EXPORT_SYMBOL_GPL(dm_sm_disk_create);
289
290 struct dm_space_map *dm_sm_disk_open(struct dm_transaction_manager *tm,
291 void *root_le, size_t len)
292 {
293 int r;
294 struct sm_disk *smd;
295
296 smd = kmalloc(sizeof(*smd), GFP_KERNEL);
297 if (!smd)
298 return ERR_PTR(-ENOMEM);
299
300 smd->begin = 0;
301 smd->nr_allocated_this_transaction = 0;
302 memcpy(&smd->sm, &ops, sizeof(smd->sm));
303
304 r = sm_ll_open_disk(&smd->ll, tm, root_le, len);
305 if (r)
306 goto bad;
307
308 r = sm_disk_commit(&smd->sm);
309 if (r)
310 goto bad;
311
312 return &smd->sm;
313
314 bad:
315 kfree(smd);
316 return ERR_PTR(r);
317 }
318 EXPORT_SYMBOL_GPL(dm_sm_disk_open);
319
320