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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2011 Red Hat, Inc.4 *5 * This file is released under the GPL.6 */7 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"12 13#include <linux/list.h>14#include <linux/slab.h>15#include <linux/export.h>16#include <linux/device-mapper.h>17 18#define DM_MSG_PREFIX "space map disk"19 20/*----------------------------------------------------------------*/21 22/*23 * Space map interface.24 */25struct sm_disk {26 struct dm_space_map sm;27 28 struct ll_disk ll;29 struct ll_disk old_ll;30 31 dm_block_t begin;32 dm_block_t nr_allocated_this_transaction;33};34 35static void sm_disk_destroy(struct dm_space_map *sm)36{37 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);38 39 kfree(smd);40}41 42static int sm_disk_extend(struct dm_space_map *sm, dm_block_t extra_blocks)43{44 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);45 46 return sm_ll_extend(&smd->ll, extra_blocks);47}48 49static int sm_disk_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count)50{51 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);52 53 *count = smd->old_ll.nr_blocks;54 55 return 0;56}57 58static int sm_disk_get_nr_free(struct dm_space_map *sm, dm_block_t *count)59{60 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);61 62 *count = (smd->old_ll.nr_blocks - smd->old_ll.nr_allocated) - smd->nr_allocated_this_transaction;63 64 return 0;65}66 67static int sm_disk_get_count(struct dm_space_map *sm, dm_block_t b,68 uint32_t *result)69{70 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);71 72 return sm_ll_lookup(&smd->ll, b, result);73}74 75static int sm_disk_count_is_more_than_one(struct dm_space_map *sm, dm_block_t b,76 int *result)77{78 int r;79 uint32_t count;80 81 r = sm_disk_get_count(sm, b, &count);82 if (r)83 return r;84 85 *result = count > 1;86 87 return 0;88}89 90static int sm_disk_set_count(struct dm_space_map *sm, dm_block_t b,91 uint32_t count)92{93 int r;94 int32_t nr_allocations;95 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);96 97 r = sm_ll_insert(&smd->ll, b, count, &nr_allocations);98 if (!r)99 smd->nr_allocated_this_transaction += nr_allocations;100 101 return r;102}103 104static int sm_disk_inc_blocks(struct dm_space_map *sm, dm_block_t b, dm_block_t e)105{106 int r;107 int32_t nr_allocations;108 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);109 110 r = sm_ll_inc(&smd->ll, b, e, &nr_allocations);111 if (!r)112 smd->nr_allocated_this_transaction += nr_allocations;113 114 return r;115}116 117static int sm_disk_dec_blocks(struct dm_space_map *sm, dm_block_t b, dm_block_t e)118{119 int r;120 int32_t nr_allocations;121 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);122 123 r = sm_ll_dec(&smd->ll, b, e, &nr_allocations);124 if (!r)125 smd->nr_allocated_this_transaction += nr_allocations;126 127 return r;128}129 130static int sm_disk_new_block(struct dm_space_map *sm, dm_block_t *b)131{132 int r;133 int32_t nr_allocations;134 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);135 136 /*137 * Any block we allocate has to be free in both the old and current ll.138 */139 r = sm_ll_find_common_free_block(&smd->old_ll, &smd->ll, smd->begin, smd->ll.nr_blocks, b);140 if (r == -ENOSPC)141 /*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.144 */145 r = sm_ll_find_common_free_block(&smd->old_ll, &smd->ll, 0, smd->begin, b);146 147 if (r)148 return r;149 150 smd->begin = *b + 1;151 r = sm_ll_inc(&smd->ll, *b, *b + 1, &nr_allocations);152 if (!r)153 smd->nr_allocated_this_transaction += nr_allocations;154 155 return r;156}157 158static int sm_disk_commit(struct dm_space_map *sm)159{160 int r;161 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);162 163 r = sm_ll_commit(&smd->ll);164 if (r)165 return r;166 167 memcpy(&smd->old_ll, &smd->ll, sizeof(smd->old_ll));168 smd->nr_allocated_this_transaction = 0;169 170 return 0;171}172 173static int sm_disk_root_size(struct dm_space_map *sm, size_t *result)174{175 *result = sizeof(struct disk_sm_root);176 177 return 0;178}179 180static int sm_disk_copy_root(struct dm_space_map *sm, void *where_le, size_t max)181{182 struct sm_disk *smd = container_of(sm, struct sm_disk, sm);183 struct disk_sm_root root_le;184 185 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);189 190 if (max < sizeof(root_le))191 return -ENOSPC;192 193 memcpy(where_le, &root_le, sizeof(root_le));194 195 return 0;196}197 198/*----------------------------------------------------------------*/199 200static 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 = NULL215};216 217struct dm_space_map *dm_sm_disk_create(struct dm_transaction_manager *tm,218 dm_block_t nr_blocks)219{220 int r;221 struct sm_disk *smd;222 223 smd = kmalloc(sizeof(*smd), GFP_KERNEL);224 if (!smd)225 return ERR_PTR(-ENOMEM);226 227 smd->begin = 0;228 smd->nr_allocated_this_transaction = 0;229 memcpy(&smd->sm, &ops, sizeof(smd->sm));230 231 r = sm_ll_new_disk(&smd->ll, tm);232 if (r)233 goto bad;234 235 r = sm_ll_extend(&smd->ll, nr_blocks);236 if (r)237 goto bad;238 239 r = sm_disk_commit(&smd->sm);240 if (r)241 goto bad;242 243 return &smd->sm;244 245bad:246 kfree(smd);247 return ERR_PTR(r);248}249EXPORT_SYMBOL_GPL(dm_sm_disk_create);250 251struct dm_space_map *dm_sm_disk_open(struct dm_transaction_manager *tm,252 void *root_le, size_t len)253{254 int r;255 struct sm_disk *smd;256 257 smd = kmalloc(sizeof(*smd), GFP_KERNEL);258 if (!smd)259 return ERR_PTR(-ENOMEM);260 261 smd->begin = 0;262 smd->nr_allocated_this_transaction = 0;263 memcpy(&smd->sm, &ops, sizeof(smd->sm));264 265 r = sm_ll_open_disk(&smd->ll, tm, root_le, len);266 if (r)267 goto bad;268 269 r = sm_disk_commit(&smd->sm);270 if (r)271 goto bad;272 273 return &smd->sm;274 275bad:276 kfree(smd);277 return ERR_PTR(r);278}279EXPORT_SYMBOL_GPL(dm_sm_disk_open);280 281/*----------------------------------------------------------------*/282