760 lines
17 KiB
C
760 lines
17 KiB
C
/*
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* Copyright (C) 2011 Red Hat, Inc.
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*
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* This file is released under the GPL.
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*/
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#include "dm-space-map-common.h"
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#include "dm-transaction-manager.h"
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#include <linux/bitops.h>
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#include <linux/device-mapper.h>
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#define DM_MSG_PREFIX "space map common"
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/*----------------------------------------------------------------*/
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/*
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* Index validator.
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*/
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#define INDEX_CSUM_XOR 160478
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static void index_prepare_for_write(struct dm_block_validator *v,
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struct dm_block *b,
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size_t block_size)
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{
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struct disk_metadata_index *mi_le = dm_block_data(b);
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mi_le->blocknr = cpu_to_le64(dm_block_location(b));
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mi_le->csum = cpu_to_le32(dm_bm_checksum(&mi_le->padding,
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block_size - sizeof(__le32),
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INDEX_CSUM_XOR));
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}
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static int index_check(struct dm_block_validator *v,
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struct dm_block *b,
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size_t block_size)
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{
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struct disk_metadata_index *mi_le = dm_block_data(b);
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__le32 csum_disk;
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if (dm_block_location(b) != le64_to_cpu(mi_le->blocknr)) {
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DMERR_LIMIT("index_check failed: blocknr %llu != wanted %llu",
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le64_to_cpu(mi_le->blocknr), dm_block_location(b));
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return -ENOTBLK;
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}
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csum_disk = cpu_to_le32(dm_bm_checksum(&mi_le->padding,
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block_size - sizeof(__le32),
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INDEX_CSUM_XOR));
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if (csum_disk != mi_le->csum) {
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DMERR_LIMIT("index_check failed: csum %u != wanted %u",
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le32_to_cpu(csum_disk), le32_to_cpu(mi_le->csum));
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return -EILSEQ;
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}
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return 0;
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}
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static struct dm_block_validator index_validator = {
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.name = "index",
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.prepare_for_write = index_prepare_for_write,
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.check = index_check
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};
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/*----------------------------------------------------------------*/
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/*
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* Bitmap validator
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*/
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#define BITMAP_CSUM_XOR 240779
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static void dm_bitmap_prepare_for_write(struct dm_block_validator *v,
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struct dm_block *b,
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size_t block_size)
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{
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struct disk_bitmap_header *disk_header = dm_block_data(b);
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disk_header->blocknr = cpu_to_le64(dm_block_location(b));
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disk_header->csum = cpu_to_le32(dm_bm_checksum(&disk_header->not_used,
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block_size - sizeof(__le32),
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BITMAP_CSUM_XOR));
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}
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static int dm_bitmap_check(struct dm_block_validator *v,
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struct dm_block *b,
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size_t block_size)
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{
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struct disk_bitmap_header *disk_header = dm_block_data(b);
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__le32 csum_disk;
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if (dm_block_location(b) != le64_to_cpu(disk_header->blocknr)) {
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DMERR_LIMIT("bitmap check failed: blocknr %llu != wanted %llu",
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le64_to_cpu(disk_header->blocknr), dm_block_location(b));
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return -ENOTBLK;
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}
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csum_disk = cpu_to_le32(dm_bm_checksum(&disk_header->not_used,
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block_size - sizeof(__le32),
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BITMAP_CSUM_XOR));
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if (csum_disk != disk_header->csum) {
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DMERR_LIMIT("bitmap check failed: csum %u != wanted %u",
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le32_to_cpu(csum_disk), le32_to_cpu(disk_header->csum));
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return -EILSEQ;
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}
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return 0;
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}
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static struct dm_block_validator dm_sm_bitmap_validator = {
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.name = "sm_bitmap",
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.prepare_for_write = dm_bitmap_prepare_for_write,
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.check = dm_bitmap_check,
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};
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/*----------------------------------------------------------------*/
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#define ENTRIES_PER_WORD 32
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#define ENTRIES_SHIFT 5
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static void *dm_bitmap_data(struct dm_block *b)
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{
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return dm_block_data(b) + sizeof(struct disk_bitmap_header);
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}
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#define WORD_MASK_HIGH 0xAAAAAAAAAAAAAAAAULL
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static unsigned dm_bitmap_word_used(void *addr, unsigned b)
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{
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__le64 *words_le = addr;
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__le64 *w_le = words_le + (b >> ENTRIES_SHIFT);
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uint64_t bits = le64_to_cpu(*w_le);
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uint64_t mask = (bits + WORD_MASK_HIGH + 1) & WORD_MASK_HIGH;
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return !(~bits & mask);
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}
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static unsigned sm_lookup_bitmap(void *addr, unsigned b)
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{
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__le64 *words_le = addr;
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__le64 *w_le = words_le + (b >> ENTRIES_SHIFT);
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unsigned hi, lo;
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b = (b & (ENTRIES_PER_WORD - 1)) << 1;
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hi = !!test_bit_le(b, (void *) w_le);
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lo = !!test_bit_le(b + 1, (void *) w_le);
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return (hi << 1) | lo;
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}
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static void sm_set_bitmap(void *addr, unsigned b, unsigned val)
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{
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__le64 *words_le = addr;
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__le64 *w_le = words_le + (b >> ENTRIES_SHIFT);
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b = (b & (ENTRIES_PER_WORD - 1)) << 1;
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if (val & 2)
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__set_bit_le(b, (void *) w_le);
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else
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__clear_bit_le(b, (void *) w_le);
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if (val & 1)
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__set_bit_le(b + 1, (void *) w_le);
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else
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__clear_bit_le(b + 1, (void *) w_le);
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}
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static int sm_find_free(void *addr, unsigned begin, unsigned end,
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unsigned *result)
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{
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while (begin < end) {
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if (!(begin & (ENTRIES_PER_WORD - 1)) &&
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dm_bitmap_word_used(addr, begin)) {
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begin += ENTRIES_PER_WORD;
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continue;
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}
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if (!sm_lookup_bitmap(addr, begin)) {
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*result = begin;
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return 0;
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}
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begin++;
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}
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return -ENOSPC;
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}
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/*----------------------------------------------------------------*/
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static int sm_ll_init(struct ll_disk *ll, struct dm_transaction_manager *tm)
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{
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memset(ll, 0, sizeof(struct ll_disk));
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ll->tm = tm;
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ll->bitmap_info.tm = tm;
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ll->bitmap_info.levels = 1;
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/*
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* Because the new bitmap blocks are created via a shadow
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* operation, the old entry has already had its reference count
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* decremented and we don't need the btree to do any bookkeeping.
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*/
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ll->bitmap_info.value_type.size = sizeof(struct disk_index_entry);
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ll->bitmap_info.value_type.inc = NULL;
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ll->bitmap_info.value_type.dec = NULL;
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ll->bitmap_info.value_type.equal = NULL;
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ll->ref_count_info.tm = tm;
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ll->ref_count_info.levels = 1;
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ll->ref_count_info.value_type.size = sizeof(uint32_t);
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ll->ref_count_info.value_type.inc = NULL;
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ll->ref_count_info.value_type.dec = NULL;
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ll->ref_count_info.value_type.equal = NULL;
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ll->block_size = dm_bm_block_size(dm_tm_get_bm(tm));
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if (ll->block_size > (1 << 30)) {
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DMERR("block size too big to hold bitmaps");
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return -EINVAL;
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}
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ll->entries_per_block = (ll->block_size - sizeof(struct disk_bitmap_header)) *
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ENTRIES_PER_BYTE;
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ll->nr_blocks = 0;
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ll->bitmap_root = 0;
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ll->ref_count_root = 0;
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ll->bitmap_index_changed = false;
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return 0;
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}
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int sm_ll_extend(struct ll_disk *ll, dm_block_t extra_blocks)
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{
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int r;
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dm_block_t i, nr_blocks, nr_indexes;
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unsigned old_blocks, blocks;
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nr_blocks = ll->nr_blocks + extra_blocks;
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old_blocks = dm_sector_div_up(ll->nr_blocks, ll->entries_per_block);
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blocks = dm_sector_div_up(nr_blocks, ll->entries_per_block);
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nr_indexes = dm_sector_div_up(nr_blocks, ll->entries_per_block);
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if (nr_indexes > ll->max_entries(ll)) {
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DMERR("space map too large");
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return -EINVAL;
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}
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/*
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* We need to set this before the dm_tm_new_block() call below.
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*/
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ll->nr_blocks = nr_blocks;
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for (i = old_blocks; i < blocks; i++) {
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struct dm_block *b;
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struct disk_index_entry idx;
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r = dm_tm_new_block(ll->tm, &dm_sm_bitmap_validator, &b);
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if (r < 0)
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return r;
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idx.blocknr = cpu_to_le64(dm_block_location(b));
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dm_tm_unlock(ll->tm, b);
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idx.nr_free = cpu_to_le32(ll->entries_per_block);
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idx.none_free_before = 0;
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r = ll->save_ie(ll, i, &idx);
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if (r < 0)
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return r;
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}
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return 0;
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}
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int sm_ll_lookup_bitmap(struct ll_disk *ll, dm_block_t b, uint32_t *result)
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{
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int r;
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dm_block_t index = b;
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struct disk_index_entry ie_disk;
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struct dm_block *blk;
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b = do_div(index, ll->entries_per_block);
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r = ll->load_ie(ll, index, &ie_disk);
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if (r < 0)
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return r;
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r = dm_tm_read_lock(ll->tm, le64_to_cpu(ie_disk.blocknr),
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&dm_sm_bitmap_validator, &blk);
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if (r < 0)
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return r;
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*result = sm_lookup_bitmap(dm_bitmap_data(blk), b);
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dm_tm_unlock(ll->tm, blk);
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return 0;
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}
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static int sm_ll_lookup_big_ref_count(struct ll_disk *ll, dm_block_t b,
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uint32_t *result)
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{
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__le32 le_rc;
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int r;
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r = dm_btree_lookup(&ll->ref_count_info, ll->ref_count_root, &b, &le_rc);
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if (r < 0)
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return r;
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*result = le32_to_cpu(le_rc);
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return r;
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}
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int sm_ll_lookup(struct ll_disk *ll, dm_block_t b, uint32_t *result)
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{
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int r = sm_ll_lookup_bitmap(ll, b, result);
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if (r)
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return r;
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if (*result != 3)
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return r;
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return sm_ll_lookup_big_ref_count(ll, b, result);
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}
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int sm_ll_find_free_block(struct ll_disk *ll, dm_block_t begin,
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dm_block_t end, dm_block_t *result)
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{
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int r;
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struct disk_index_entry ie_disk;
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dm_block_t i, index_begin = begin;
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dm_block_t index_end = dm_sector_div_up(end, ll->entries_per_block);
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/*
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* FIXME: Use shifts
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*/
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begin = do_div(index_begin, ll->entries_per_block);
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end = do_div(end, ll->entries_per_block);
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for (i = index_begin; i < index_end; i++, begin = 0) {
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struct dm_block *blk;
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unsigned position;
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uint32_t bit_end;
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r = ll->load_ie(ll, i, &ie_disk);
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if (r < 0)
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return r;
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if (le32_to_cpu(ie_disk.nr_free) == 0)
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continue;
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r = dm_tm_read_lock(ll->tm, le64_to_cpu(ie_disk.blocknr),
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&dm_sm_bitmap_validator, &blk);
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if (r < 0)
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return r;
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bit_end = (i == index_end - 1) ? end : ll->entries_per_block;
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r = sm_find_free(dm_bitmap_data(blk),
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max_t(unsigned, begin, le32_to_cpu(ie_disk.none_free_before)),
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bit_end, &position);
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if (r == -ENOSPC) {
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/*
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* This might happen because we started searching
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* part way through the bitmap.
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*/
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dm_tm_unlock(ll->tm, blk);
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continue;
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} else if (r < 0) {
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dm_tm_unlock(ll->tm, blk);
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return r;
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}
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dm_tm_unlock(ll->tm, blk);
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*result = i * ll->entries_per_block + (dm_block_t) position;
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return 0;
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}
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return -ENOSPC;
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}
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static int sm_ll_mutate(struct ll_disk *ll, dm_block_t b,
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int (*mutator)(void *context, uint32_t old, uint32_t *new),
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void *context, enum allocation_event *ev)
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{
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int r;
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uint32_t bit, old, ref_count;
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struct dm_block *nb;
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dm_block_t index = b;
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struct disk_index_entry ie_disk;
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void *bm_le;
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int inc;
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bit = do_div(index, ll->entries_per_block);
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r = ll->load_ie(ll, index, &ie_disk);
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if (r < 0)
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return r;
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r = dm_tm_shadow_block(ll->tm, le64_to_cpu(ie_disk.blocknr),
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&dm_sm_bitmap_validator, &nb, &inc);
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if (r < 0) {
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DMERR("dm_tm_shadow_block() failed");
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return r;
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}
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ie_disk.blocknr = cpu_to_le64(dm_block_location(nb));
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bm_le = dm_bitmap_data(nb);
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old = sm_lookup_bitmap(bm_le, bit);
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if (old > 2) {
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r = sm_ll_lookup_big_ref_count(ll, b, &old);
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if (r < 0) {
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dm_tm_unlock(ll->tm, nb);
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return r;
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}
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}
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r = mutator(context, old, &ref_count);
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if (r) {
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dm_tm_unlock(ll->tm, nb);
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return r;
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}
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if (ref_count <= 2) {
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sm_set_bitmap(bm_le, bit, ref_count);
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dm_tm_unlock(ll->tm, nb);
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if (old > 2) {
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r = dm_btree_remove(&ll->ref_count_info,
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ll->ref_count_root,
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&b, &ll->ref_count_root);
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if (r)
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return r;
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}
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} else {
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__le32 le_rc = cpu_to_le32(ref_count);
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sm_set_bitmap(bm_le, bit, 3);
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dm_tm_unlock(ll->tm, nb);
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__dm_bless_for_disk(&le_rc);
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r = dm_btree_insert(&ll->ref_count_info, ll->ref_count_root,
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&b, &le_rc, &ll->ref_count_root);
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if (r < 0) {
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DMERR("ref count insert failed");
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return r;
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}
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}
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if (ref_count && !old) {
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*ev = SM_ALLOC;
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ll->nr_allocated++;
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le32_add_cpu(&ie_disk.nr_free, -1);
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if (le32_to_cpu(ie_disk.none_free_before) == bit)
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ie_disk.none_free_before = cpu_to_le32(bit + 1);
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} else if (old && !ref_count) {
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*ev = SM_FREE;
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ll->nr_allocated--;
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le32_add_cpu(&ie_disk.nr_free, 1);
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ie_disk.none_free_before = cpu_to_le32(min(le32_to_cpu(ie_disk.none_free_before), bit));
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} else
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*ev = SM_NONE;
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return ll->save_ie(ll, index, &ie_disk);
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}
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static int set_ref_count(void *context, uint32_t old, uint32_t *new)
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{
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*new = *((uint32_t *) context);
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return 0;
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}
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int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
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uint32_t ref_count, enum allocation_event *ev)
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{
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return sm_ll_mutate(ll, b, set_ref_count, &ref_count, ev);
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}
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static int inc_ref_count(void *context, uint32_t old, uint32_t *new)
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{
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*new = old + 1;
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return 0;
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}
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int sm_ll_inc(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
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{
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return sm_ll_mutate(ll, b, inc_ref_count, NULL, ev);
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}
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static int dec_ref_count(void *context, uint32_t old, uint32_t *new)
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{
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if (!old) {
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DMERR_LIMIT("unable to decrement a reference count below 0");
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return -EINVAL;
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}
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*new = old - 1;
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return 0;
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}
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int sm_ll_dec(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
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{
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return sm_ll_mutate(ll, b, dec_ref_count, NULL, ev);
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}
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int sm_ll_commit(struct ll_disk *ll)
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{
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int r = 0;
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if (ll->bitmap_index_changed) {
|
|
r = ll->commit(ll);
|
|
if (!r)
|
|
ll->bitmap_index_changed = false;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
static int metadata_ll_load_ie(struct ll_disk *ll, dm_block_t index,
|
|
struct disk_index_entry *ie)
|
|
{
|
|
memcpy(ie, ll->mi_le.index + index, sizeof(*ie));
|
|
return 0;
|
|
}
|
|
|
|
static int metadata_ll_save_ie(struct ll_disk *ll, dm_block_t index,
|
|
struct disk_index_entry *ie)
|
|
{
|
|
ll->bitmap_index_changed = true;
|
|
memcpy(ll->mi_le.index + index, ie, sizeof(*ie));
|
|
return 0;
|
|
}
|
|
|
|
static int metadata_ll_init_index(struct ll_disk *ll)
|
|
{
|
|
int r;
|
|
struct dm_block *b;
|
|
|
|
r = dm_tm_new_block(ll->tm, &index_validator, &b);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
ll->bitmap_root = dm_block_location(b);
|
|
|
|
dm_tm_unlock(ll->tm, b);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int metadata_ll_open(struct ll_disk *ll)
|
|
{
|
|
int r;
|
|
struct dm_block *block;
|
|
|
|
r = dm_tm_read_lock(ll->tm, ll->bitmap_root,
|
|
&index_validator, &block);
|
|
if (r)
|
|
return r;
|
|
|
|
memcpy(&ll->mi_le, dm_block_data(block), sizeof(ll->mi_le));
|
|
dm_tm_unlock(ll->tm, block);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static dm_block_t metadata_ll_max_entries(struct ll_disk *ll)
|
|
{
|
|
return MAX_METADATA_BITMAPS;
|
|
}
|
|
|
|
static int metadata_ll_commit(struct ll_disk *ll)
|
|
{
|
|
int r, inc;
|
|
struct dm_block *b;
|
|
|
|
r = dm_tm_shadow_block(ll->tm, ll->bitmap_root, &index_validator, &b, &inc);
|
|
if (r)
|
|
return r;
|
|
|
|
memcpy(dm_block_data(b), &ll->mi_le, sizeof(ll->mi_le));
|
|
ll->bitmap_root = dm_block_location(b);
|
|
|
|
dm_tm_unlock(ll->tm, b);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sm_ll_new_metadata(struct ll_disk *ll, struct dm_transaction_manager *tm)
|
|
{
|
|
int r;
|
|
|
|
r = sm_ll_init(ll, tm);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
ll->load_ie = metadata_ll_load_ie;
|
|
ll->save_ie = metadata_ll_save_ie;
|
|
ll->init_index = metadata_ll_init_index;
|
|
ll->open_index = metadata_ll_open;
|
|
ll->max_entries = metadata_ll_max_entries;
|
|
ll->commit = metadata_ll_commit;
|
|
|
|
ll->nr_blocks = 0;
|
|
ll->nr_allocated = 0;
|
|
|
|
r = ll->init_index(ll);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dm_btree_empty(&ll->ref_count_info, &ll->ref_count_root);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sm_ll_open_metadata(struct ll_disk *ll, struct dm_transaction_manager *tm,
|
|
void *root_le, size_t len)
|
|
{
|
|
int r;
|
|
struct disk_sm_root smr;
|
|
|
|
if (len < sizeof(struct disk_sm_root)) {
|
|
DMERR("sm_metadata root too small");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* We don't know the alignment of the root_le buffer, so need to
|
|
* copy into a new structure.
|
|
*/
|
|
memcpy(&smr, root_le, sizeof(smr));
|
|
|
|
r = sm_ll_init(ll, tm);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
ll->load_ie = metadata_ll_load_ie;
|
|
ll->save_ie = metadata_ll_save_ie;
|
|
ll->init_index = metadata_ll_init_index;
|
|
ll->open_index = metadata_ll_open;
|
|
ll->max_entries = metadata_ll_max_entries;
|
|
ll->commit = metadata_ll_commit;
|
|
|
|
ll->nr_blocks = le64_to_cpu(smr.nr_blocks);
|
|
ll->nr_allocated = le64_to_cpu(smr.nr_allocated);
|
|
ll->bitmap_root = le64_to_cpu(smr.bitmap_root);
|
|
ll->ref_count_root = le64_to_cpu(smr.ref_count_root);
|
|
|
|
return ll->open_index(ll);
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
static int disk_ll_load_ie(struct ll_disk *ll, dm_block_t index,
|
|
struct disk_index_entry *ie)
|
|
{
|
|
return dm_btree_lookup(&ll->bitmap_info, ll->bitmap_root, &index, ie);
|
|
}
|
|
|
|
static int disk_ll_save_ie(struct ll_disk *ll, dm_block_t index,
|
|
struct disk_index_entry *ie)
|
|
{
|
|
__dm_bless_for_disk(ie);
|
|
return dm_btree_insert(&ll->bitmap_info, ll->bitmap_root,
|
|
&index, ie, &ll->bitmap_root);
|
|
}
|
|
|
|
static int disk_ll_init_index(struct ll_disk *ll)
|
|
{
|
|
return dm_btree_empty(&ll->bitmap_info, &ll->bitmap_root);
|
|
}
|
|
|
|
static int disk_ll_open(struct ll_disk *ll)
|
|
{
|
|
/* nothing to do */
|
|
return 0;
|
|
}
|
|
|
|
static dm_block_t disk_ll_max_entries(struct ll_disk *ll)
|
|
{
|
|
return -1ULL;
|
|
}
|
|
|
|
static int disk_ll_commit(struct ll_disk *ll)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int sm_ll_new_disk(struct ll_disk *ll, struct dm_transaction_manager *tm)
|
|
{
|
|
int r;
|
|
|
|
r = sm_ll_init(ll, tm);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
ll->load_ie = disk_ll_load_ie;
|
|
ll->save_ie = disk_ll_save_ie;
|
|
ll->init_index = disk_ll_init_index;
|
|
ll->open_index = disk_ll_open;
|
|
ll->max_entries = disk_ll_max_entries;
|
|
ll->commit = disk_ll_commit;
|
|
|
|
ll->nr_blocks = 0;
|
|
ll->nr_allocated = 0;
|
|
|
|
r = ll->init_index(ll);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dm_btree_empty(&ll->ref_count_info, &ll->ref_count_root);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sm_ll_open_disk(struct ll_disk *ll, struct dm_transaction_manager *tm,
|
|
void *root_le, size_t len)
|
|
{
|
|
int r;
|
|
struct disk_sm_root *smr = root_le;
|
|
|
|
if (len < sizeof(struct disk_sm_root)) {
|
|
DMERR("sm_metadata root too small");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
r = sm_ll_init(ll, tm);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
ll->load_ie = disk_ll_load_ie;
|
|
ll->save_ie = disk_ll_save_ie;
|
|
ll->init_index = disk_ll_init_index;
|
|
ll->open_index = disk_ll_open;
|
|
ll->max_entries = disk_ll_max_entries;
|
|
ll->commit = disk_ll_commit;
|
|
|
|
ll->nr_blocks = le64_to_cpu(smr->nr_blocks);
|
|
ll->nr_allocated = le64_to_cpu(smr->nr_allocated);
|
|
ll->bitmap_root = le64_to_cpu(smr->bitmap_root);
|
|
ll->ref_count_root = le64_to_cpu(smr->ref_count_root);
|
|
|
|
return ll->open_index(ll);
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|