1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011 Red Hat, Inc.
5 * This file is released under the GPL.
8 #include "dm-space-map-common.h"
9 #include "dm-space-map-disk.h"
10 #include "dm-space-map.h"
11 #include "dm-transaction-manager.h"
13 #include <linux/list.h>
14 #include <linux/slab.h>
15 #include <linux/export.h>
16 #include <linux/device-mapper.h>
18 #define DM_MSG_PREFIX "space map disk"
20 /*----------------------------------------------------------------*/
23 * Space map interface.
26 struct dm_space_map sm;
29 struct ll_disk old_ll;
32 dm_block_t nr_allocated_this_transaction;
35 static void sm_disk_destroy(struct dm_space_map *sm)
37 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
42 static int sm_disk_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
44 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
46 return sm_ll_extend(&smd->ll, extra_blocks);
49 static int sm_disk_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count)
51 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
53 *count = smd->old_ll.nr_blocks;
58 static int sm_disk_get_nr_free(struct dm_space_map *sm, dm_block_t *count)
60 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
62 *count = (smd->old_ll.nr_blocks - smd->old_ll.nr_allocated) - smd->nr_allocated_this_transaction;
67 static int sm_disk_get_count(struct dm_space_map *sm, dm_block_t b,
70 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
72 return sm_ll_lookup(&smd->ll, b, result);
75 static int sm_disk_count_is_more_than_one(struct dm_space_map *sm, dm_block_t b,
81 r = sm_disk_get_count(sm, b, &count);
90 static int sm_disk_set_count(struct dm_space_map *sm, dm_block_t b,
94 int32_t nr_allocations;
95 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
97 r = sm_ll_insert(&smd->ll, b, count, &nr_allocations);
99 smd->nr_allocated_this_transaction += nr_allocations;
104 static int sm_disk_inc_blocks(struct dm_space_map *sm, dm_block_t b, dm_block_t e)
107 int32_t nr_allocations;
108 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
110 r = sm_ll_inc(&smd->ll, b, e, &nr_allocations);
112 smd->nr_allocated_this_transaction += nr_allocations;
117 static int sm_disk_dec_blocks(struct dm_space_map *sm, dm_block_t b, dm_block_t e)
120 int32_t nr_allocations;
121 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
123 r = sm_ll_dec(&smd->ll, b, e, &nr_allocations);
125 smd->nr_allocated_this_transaction += nr_allocations;
130 static int sm_disk_new_block(struct dm_space_map *sm, dm_block_t *b)
133 int32_t nr_allocations;
134 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
137 * Any block we allocate has to be free in both the old and current ll.
139 r = sm_ll_find_common_free_block(&smd->old_ll, &smd->ll, smd->begin, smd->ll.nr_blocks, b);
142 * There's no free block between smd->begin and the end of the metadata device.
143 * We search before smd->begin in case something has been freed.
145 r = sm_ll_find_common_free_block(&smd->old_ll, &smd->ll, 0, smd->begin, b);
151 r = sm_ll_inc(&smd->ll, *b, *b + 1, &nr_allocations);
153 smd->nr_allocated_this_transaction += nr_allocations;
158 static int sm_disk_commit(struct dm_space_map *sm)
161 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
163 r = sm_ll_commit(&smd->ll);
167 memcpy(&smd->old_ll, &smd->ll, sizeof(smd->old_ll));
168 smd->nr_allocated_this_transaction = 0;
173 static int sm_disk_root_size(struct dm_space_map *sm, size_t *result)
175 *result = sizeof(struct disk_sm_root);
180 static int sm_disk_copy_root(struct dm_space_map *sm, void *where_le, size_t max)
182 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);
183 struct disk_sm_root root_le;
185 root_le.nr_blocks = cpu_to_le64(smd->ll.nr_blocks);
186 root_le.nr_allocated = cpu_to_le64(smd->ll.nr_allocated);
187 root_le.bitmap_root = cpu_to_le64(smd->ll.bitmap_root);
188 root_le.ref_count_root = cpu_to_le64(smd->ll.ref_count_root);
190 if (max < sizeof(root_le))
193 memcpy(where_le, &root_le, sizeof(root_le));
198 /*----------------------------------------------------------------*/
200 static struct dm_space_map ops = {
201 .destroy = sm_disk_destroy,
202 .extend = sm_disk_extend,
203 .get_nr_blocks = sm_disk_get_nr_blocks,
204 .get_nr_free = sm_disk_get_nr_free,
205 .get_count = sm_disk_get_count,
206 .count_is_more_than_one = sm_disk_count_is_more_than_one,
207 .set_count = sm_disk_set_count,
208 .inc_blocks = sm_disk_inc_blocks,
209 .dec_blocks = sm_disk_dec_blocks,
210 .new_block = sm_disk_new_block,
211 .commit = sm_disk_commit,
212 .root_size = sm_disk_root_size,
213 .copy_root = sm_disk_copy_root,
214 .register_threshold_callback = NULL
217 struct dm_space_map *dm_sm_disk_create(struct dm_transaction_manager *tm,
218 dm_block_t nr_blocks)
223 smd = kmalloc(sizeof(*smd), GFP_KERNEL);
225 return ERR_PTR(-ENOMEM);
228 smd->nr_allocated_this_transaction = 0;
229 memcpy(&smd->sm, &ops, sizeof(smd->sm));
231 r = sm_ll_new_disk(&smd->ll, tm);
235 r = sm_ll_extend(&smd->ll, nr_blocks);
239 r = sm_disk_commit(&smd->sm);
249 EXPORT_SYMBOL_GPL(dm_sm_disk_create);
251 struct dm_space_map *dm_sm_disk_open(struct dm_transaction_manager *tm,
252 void *root_le, size_t len)
257 smd = kmalloc(sizeof(*smd), GFP_KERNEL);
259 return ERR_PTR(-ENOMEM);
262 smd->nr_allocated_this_transaction = 0;
263 memcpy(&smd->sm, &ops, sizeof(smd->sm));
265 r = sm_ll_open_disk(&smd->ll, tm, root_le, len);
269 r = sm_disk_commit(&smd->sm);
279 EXPORT_SYMBOL_GPL(dm_sm_disk_open);
281 /*----------------------------------------------------------------*/