453 lines
17 KiB
C++
453 lines
17 KiB
C++
// Copyright (c) Vitaliy Filippov, 2019+
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// License: VNPL-1.1 (see README.md for details)
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#include "disk_tool.h"
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int disk_tool_t::dump_journal()
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{
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dump_with_blocks = options["format"] == "blocks";
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dump_with_data = options["format"] == "data" || options["format"] == "blocks,data";
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if (dsk.journal_block_size < DIRECT_IO_ALIGNMENT || (dsk.journal_block_size % DIRECT_IO_ALIGNMENT) ||
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dsk.journal_block_size > 128*1024)
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{
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fprintf(stderr, "Invalid journal block size\n");
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return 1;
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}
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first_block = true;
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if (json)
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printf("[\n");
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if (all)
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{
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dsk.journal_fd = open(dsk.journal_device.c_str(), O_DIRECT|O_RDONLY);
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if (dsk.journal_fd < 0)
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{
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fprintf(stderr, "Failed to open journal device %s: %s\n", dsk.journal_device.c_str(), strerror(errno));
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return 1;
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}
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void *journal_buf = memalign_or_die(MEM_ALIGNMENT, dsk.journal_block_size);
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journal_pos = 0;
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while (journal_pos < dsk.journal_len)
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{
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int r = pread(dsk.journal_fd, journal_buf, dsk.journal_block_size, dsk.journal_offset+journal_pos);
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assert(r == dsk.journal_block_size);
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uint64_t s;
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for (s = 0; s < dsk.journal_block_size; s += 8)
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{
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if (*((uint64_t*)((uint8_t*)journal_buf+s)) != 0)
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break;
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}
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if (json)
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{
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printf("%s{\"offset\":\"0x%lx\"", first_block ? "" : ",\n", journal_pos);
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first_block = false;
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}
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if (s == dsk.journal_block_size)
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{
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if (json)
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printf(",\"type\":\"zero\"}");
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else
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printf("offset %08lx: zeroes\n", journal_pos);
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journal_pos += dsk.journal_block_size;
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}
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else if (((journal_entry*)journal_buf)->magic == JOURNAL_MAGIC)
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{
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if (!json)
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printf("offset %08lx:\n", journal_pos);
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else
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printf(",\"entries\":[\n");
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first_entry = true;
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process_journal_block(journal_buf, [this](int num, journal_entry *je) { dump_journal_entry(num, je, json); });
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if (json)
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printf(first_entry ? "]}" : "\n]}");
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}
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else
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{
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if (json)
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printf(",\"type\":\"data\",\"pattern\":\"%08lx\"}", *((uint64_t*)journal_buf));
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else
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printf("offset %08lx: no magic in the beginning, looks like random data (pattern=%08lx)\n", journal_pos, *((uint64_t*)journal_buf));
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journal_pos += dsk.journal_block_size;
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}
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}
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free(journal_buf);
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close(dsk.journal_fd);
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dsk.journal_fd = -1;
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}
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else
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{
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first_entry = true;
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process_journal([this](void *data)
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{
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if (json && dump_with_blocks)
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first_entry = true;
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if (!json)
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printf("offset %08lx:\n", journal_pos);
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auto pos = journal_pos;
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int r = process_journal_block(data, [this, pos](int num, journal_entry *je)
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{
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if (json && dump_with_blocks && first_entry)
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printf("%s{\"offset\":\"0x%lx\",\"entries\":[\n", first_block ? "" : ",\n", pos);
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dump_journal_entry(num, je, json);
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first_block = false;
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});
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if (json && dump_with_blocks && !first_entry)
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printf("\n]}");
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else if (!json && r <= 0)
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printf("end of the journal\n");
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return r;
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});
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}
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if (json)
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printf(first_block ? "]\n" : "\n]\n");
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return 0;
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}
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int disk_tool_t::process_journal(std::function<int(void*)> block_fn)
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{
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dsk.journal_fd = open(dsk.journal_device.c_str(), O_DIRECT|O_RDONLY);
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if (dsk.journal_fd < 0)
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{
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fprintf(stderr, "Failed to open journal device %s: %s\n", dsk.journal_device.c_str(), strerror(errno));
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return 1;
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}
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void *data = memalign_or_die(MEM_ALIGNMENT, dsk.journal_block_size);
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journal_pos = 0;
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int r = pread(dsk.journal_fd, data, dsk.journal_block_size, dsk.journal_offset+journal_pos);
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assert(r == dsk.journal_block_size);
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journal_entry *je = (journal_entry*)(data);
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if (je->magic != JOURNAL_MAGIC || je->type != JE_START || je_crc32(je) != je->crc32)
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{
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fprintf(stderr, "offset %08lx: journal superblock is invalid\n", journal_pos);
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r = 1;
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}
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else
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{
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started = false;
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crc32_last = 0;
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block_fn(data);
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started = false;
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crc32_last = 0;
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journal_pos = je->start.journal_start;
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while (1)
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{
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if (journal_pos >= dsk.journal_len)
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journal_pos = dsk.journal_block_size;
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r = pread(dsk.journal_fd, data, dsk.journal_block_size, dsk.journal_offset+journal_pos);
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assert(r == dsk.journal_block_size);
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r = block_fn(data);
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if (r <= 0)
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break;
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}
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}
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close(dsk.journal_fd);
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dsk.journal_fd = -1;
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free(data);
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return r;
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}
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int disk_tool_t::process_journal_block(void *buf, std::function<void(int, journal_entry*)> iter_fn)
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{
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uint32_t pos = 0;
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journal_pos += dsk.journal_block_size;
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int entry = 0;
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bool wrapped = false;
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while (pos <= dsk.journal_block_size-JOURNAL_ENTRY_HEADER_SIZE)
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{
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journal_entry *je = (journal_entry*)((uint8_t*)buf + pos);
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if (je->magic != JOURNAL_MAGIC || je->type < JE_MIN || je->type > JE_MAX ||
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!all && started && je->crc32_prev != crc32_last || pos > dsk.journal_block_size-je->size)
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{
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break;
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}
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bool crc32_valid = je_crc32(je) == je->crc32;
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if (!all && !crc32_valid)
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{
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break;
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}
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started = true;
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crc32_last = je->crc32;
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if (je->type == JE_SMALL_WRITE || je->type == JE_SMALL_WRITE_INSTANT)
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{
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journal_calc_data_pos = journal_pos;
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if (journal_pos + je->small_write.len > dsk.journal_len)
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{
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// data continues from the beginning of the journal
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journal_calc_data_pos = journal_pos = dsk.journal_block_size;
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wrapped = true;
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}
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journal_pos += je->small_write.len;
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if (journal_pos >= dsk.journal_len)
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{
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journal_pos = dsk.journal_block_size;
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wrapped = true;
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}
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small_write_data = memalign_or_die(MEM_ALIGNMENT, je->small_write.len);
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assert(pread(dsk.journal_fd, small_write_data, je->small_write.len, dsk.journal_offset+je->small_write.data_offset) == je->small_write.len);
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data_crc32 = crc32c(0, small_write_data, je->small_write.len);
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}
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iter_fn(entry, je);
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if (je->type == JE_SMALL_WRITE || je->type == JE_SMALL_WRITE_INSTANT)
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{
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free(small_write_data);
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small_write_data = NULL;
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}
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pos += je->size;
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entry++;
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}
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if (wrapped)
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{
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journal_pos = dsk.journal_len;
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}
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return entry;
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}
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void disk_tool_t::dump_journal_entry(int num, journal_entry *je, bool json)
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{
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if (json)
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{
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if (!first_entry)
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printf(",\n");
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first_entry = false;
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printf(
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"{\"crc32\":\"%08x\",\"valid\":%s,\"crc32_prev\":\"%08x\"",
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je->crc32, (je_crc32(je) == je->crc32 ? "true" : "false"), je->crc32_prev
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);
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}
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else
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{
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printf(
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"entry % 3d: crc32=%08x %s prev=%08x ",
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num, je->crc32, (je_crc32(je) == je->crc32 ? "(valid)" : "(invalid)"), je->crc32_prev
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);
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}
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if (je->type == JE_START)
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{
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printf(
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json ? ",\"type\":\"start\",\"start\":\"0x%lx\"}" : "je_start start=%08lx\n",
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je->start.journal_start
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);
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}
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else if (je->type == JE_SMALL_WRITE || je->type == JE_SMALL_WRITE_INSTANT)
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{
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printf(
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json ? ",\"type\":\"small_write%s\",\"inode\":\"0x%lx\",\"stripe\":\"0x%lx\",\"ver\":\"%lu\",\"offset\":%u,\"len\":%u,\"loc\":\"0x%lx\""
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: "je_small_write%s oid=%lx:%lx ver=%lu offset=%u len=%u loc=%08lx",
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je->type == JE_SMALL_WRITE_INSTANT ? "_instant" : "",
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je->small_write.oid.inode, je->small_write.oid.stripe,
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je->small_write.version, je->small_write.offset, je->small_write.len,
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je->small_write.data_offset
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);
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if (journal_calc_data_pos != je->small_write.data_offset)
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{
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printf(json ? ",\"bad_loc\":true,\"calc_loc\":\"0x%lx\""
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: " (mismatched, calculated = %lu)", journal_pos);
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}
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if (je->small_write.size > sizeof(journal_entry_small_write))
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{
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printf(json ? ",\"bitmap\":\"" : " (bitmap: ");
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for (int i = sizeof(journal_entry_small_write); i < je->small_write.size; i++)
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{
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printf("%02x", ((uint8_t*)je)[i]);
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}
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printf(json ? "\"" : ")");
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}
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if (dump_with_data)
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{
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printf(json ? ",\"data\":\"" : " (data: ");
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for (int i = 0; i < je->small_write.len; i++)
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{
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printf("%02x", ((uint8_t*)small_write_data)[i]);
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}
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printf(json ? "\"" : ")");
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}
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printf(
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json ? ",\"data_crc32\":\"%08x\",\"data_valid\":%s}" : " data_crc32=%08x%s\n",
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je->small_write.crc32_data,
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(data_crc32 != je->small_write.crc32_data
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? (json ? "false" : " (invalid)")
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: (json ? "true" : " (valid)"))
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);
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}
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else if (je->type == JE_BIG_WRITE || je->type == JE_BIG_WRITE_INSTANT)
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{
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printf(
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json ? ",\"type\":\"big_write%s\",\"inode\":\"0x%lx\",\"stripe\":\"0x%lx\",\"ver\":\"%lu\",\"offset\":%u,\"len\":%u,\"loc\":\"0x%lx\""
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: "je_big_write%s oid=%lx:%lx ver=%lu offset=%u len=%u loc=%08lx",
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je->type == JE_BIG_WRITE_INSTANT ? "_instant" : "",
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je->big_write.oid.inode, je->big_write.oid.stripe,
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je->big_write.version, je->big_write.offset, je->big_write.len,
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je->big_write.location
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);
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if (je->big_write.size > sizeof(journal_entry_big_write))
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{
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printf(json ? ",\"bitmap\":\"" : " (bitmap: ");
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for (int i = sizeof(journal_entry_big_write); i < je->big_write.size; i++)
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{
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printf("%02x", ((uint8_t*)je)[i]);
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}
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printf(json ? "\"" : ")");
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}
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printf(json ? "}" : "\n");
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}
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else if (je->type == JE_STABLE)
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{
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printf(
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json ? ",\"type\":\"stable\",\"inode\":\"0x%lx\",\"stripe\":\"0x%lx\",\"ver\":\"%lu\"}"
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: "je_stable oid=%lx:%lx ver=%lu\n",
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je->stable.oid.inode, je->stable.oid.stripe, je->stable.version
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);
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}
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else if (je->type == JE_ROLLBACK)
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{
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printf(
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json ? ",\"type\":\"rollback\",\"inode\":\"0x%lx\",\"stripe\":\"0x%lx\",\"ver\":\"%lu\"}"
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: "je_rollback oid=%lx:%lx ver=%lu\n",
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je->rollback.oid.inode, je->rollback.oid.stripe, je->rollback.version
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);
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}
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else if (je->type == JE_DELETE)
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{
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printf(
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json ? ",\"type\":\"delete\",\"inode\":\"0x%lx\",\"stripe\":\"0x%lx\",\"ver\":\"%lu\"}"
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: "je_delete oid=%lx:%lx ver=%lu\n",
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je->del.oid.inode, je->del.oid.stripe, je->del.version
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);
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}
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}
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int disk_tool_t::write_json_journal(json11::Json entries)
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{
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new_journal_buf = (uint8_t*)memalign_or_die(MEM_ALIGNMENT, new_journal_len);
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new_journal_ptr = new_journal_buf;
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new_journal_data = new_journal_ptr + dsk.journal_block_size;
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new_journal_in_pos = 0;
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memset(new_journal_buf, 0, new_journal_len);
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std::map<std::string,uint16_t> type_by_name = {
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{ "start", JE_START },
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{ "small_write", JE_SMALL_WRITE },
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{ "small_write_instant", JE_SMALL_WRITE_INSTANT },
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{ "big_write", JE_BIG_WRITE },
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{ "big_write_instant", JE_BIG_WRITE_INSTANT },
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{ "stable", JE_STABLE },
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{ "delete", JE_DELETE },
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{ "rollback", JE_ROLLBACK },
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};
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// Write start entry into the first block
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*((journal_entry_start*)new_journal_buf) = (journal_entry_start){
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.magic = JOURNAL_MAGIC,
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.type = JE_START,
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.size = sizeof(journal_entry_start),
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.journal_start = dsk.journal_block_size,
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.version = JOURNAL_VERSION,
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};
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((journal_entry*)new_journal_buf)->crc32 = je_crc32((journal_entry*)new_journal_buf);
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new_journal_ptr += dsk.journal_block_size;
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new_journal_data = new_journal_ptr+dsk.journal_block_size;
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new_journal_in_pos = 0;
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for (const auto & rec: entries.array_items())
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{
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auto t_it = type_by_name.find(rec["type"].string_value());
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if (t_it == type_by_name.end())
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{
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fprintf(stderr, "Unknown journal entry type \"%s\", skipping\n", rec["type"].string_value().c_str());
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continue;
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}
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uint16_t type = t_it->second;
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if (type == JE_START)
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continue;
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uint32_t entry_size = (type == JE_START
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? sizeof(journal_entry_start)
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: (type == JE_SMALL_WRITE || type == JE_SMALL_WRITE_INSTANT
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? sizeof(journal_entry_small_write) + dsk.clean_entry_bitmap_size
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: (type == JE_BIG_WRITE || type == JE_BIG_WRITE_INSTANT
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? sizeof(journal_entry_big_write) + dsk.clean_entry_bitmap_size
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: sizeof(journal_entry_del))));
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if (dsk.journal_block_size < new_journal_in_pos + entry_size)
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{
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new_journal_ptr = new_journal_data;
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if (new_journal_ptr-new_journal_buf >= new_journal_len)
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{
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fprintf(stderr, "Error: entries don't fit to the new journal\n");
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free(new_journal_buf);
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return 1;
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}
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new_journal_data = new_journal_ptr+dsk.journal_block_size;
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new_journal_in_pos = 0;
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if (dsk.journal_block_size < entry_size)
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{
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fprintf(stderr, "Error: journal entry too large (%u bytes)\n", entry_size);
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free(new_journal_buf);
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return 1;
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}
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}
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journal_entry *ne = (journal_entry*)(new_journal_ptr + new_journal_in_pos);
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if (type == JE_SMALL_WRITE || type == JE_SMALL_WRITE_INSTANT)
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{
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if (new_journal_data - new_journal_buf + ne->small_write.len > new_journal_len)
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{
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fprintf(stderr, "Error: entries don't fit to the new journal\n");
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free(new_journal_buf);
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return 1;
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}
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*((journal_entry_small_write*)ne) = (journal_entry_small_write){
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.magic = JOURNAL_MAGIC,
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.type = type,
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.size = entry_size,
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.crc32_prev = new_crc32_prev,
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.oid = {
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.inode = sscanf_json(NULL, rec["inode"]),
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.stripe = sscanf_json(NULL, rec["stripe"]),
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},
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.version = rec["ver"].uint64_value(),
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.offset = (uint32_t)rec["offset"].uint64_value(),
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.len = (uint32_t)rec["len"].uint64_value(),
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.data_offset = (uint64_t)(new_journal_data-new_journal_buf),
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.crc32_data = (uint32_t)sscanf_json("%x", rec["data_crc32"]),
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};
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fromhexstr(rec["bitmap"].string_value(), dsk.clean_entry_bitmap_size, ((uint8_t*)ne) + sizeof(journal_entry_small_write));
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fromhexstr(rec["data"].string_value(), ne->small_write.len, new_journal_data);
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if (rec["data"].is_string())
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ne->small_write.crc32_data = crc32c(0, new_journal_data, ne->small_write.len);
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new_journal_data += ne->small_write.len;
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}
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else if (type == JE_BIG_WRITE || type == JE_BIG_WRITE_INSTANT)
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{
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*((journal_entry_big_write*)ne) = (journal_entry_big_write){
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.magic = JOURNAL_MAGIC,
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.type = type,
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.size = entry_size,
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.crc32_prev = new_crc32_prev,
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.oid = {
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.inode = sscanf_json(NULL, rec["inode"]),
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.stripe = sscanf_json(NULL, rec["stripe"]),
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},
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.version = rec["ver"].uint64_value(),
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.offset = (uint32_t)rec["offset"].uint64_value(),
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.len = (uint32_t)rec["len"].uint64_value(),
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.location = sscanf_json(NULL, rec["loc"]),
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};
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fromhexstr(rec["bitmap"].string_value(), dsk.clean_entry_bitmap_size, ((uint8_t*)ne) + sizeof(journal_entry_big_write));
|
|
}
|
|
else if (type == JE_STABLE || type == JE_ROLLBACK || type == JE_DELETE)
|
|
{
|
|
*((journal_entry_del*)ne) = (journal_entry_del){
|
|
.magic = JOURNAL_MAGIC,
|
|
.type = type,
|
|
.size = entry_size,
|
|
.crc32_prev = new_crc32_prev,
|
|
.oid = {
|
|
.inode = sscanf_json(NULL, rec["inode"]),
|
|
.stripe = sscanf_json(NULL, rec["stripe"]),
|
|
},
|
|
.version = rec["ver"].uint64_value(),
|
|
};
|
|
}
|
|
ne->crc32 = je_crc32(ne);
|
|
new_crc32_prev = ne->crc32;
|
|
new_journal_in_pos += ne->size;
|
|
}
|
|
int r = resize_write_new_journal();
|
|
free(new_journal_buf);
|
|
return r;
|
|
}
|