225 lines
7.4 KiB
C++
225 lines
7.4 KiB
C++
// Copyright (c) Vitaliy Filippov, 2019+
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// License: VNPL-1.1 (see README.md for details)
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#define _LARGEFILE64_SOURCE
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <malloc.h>
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#include <linux/fs.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <stdio.h>
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#include "blockstore_impl.h"
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#include "crc32c.h"
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struct journal_dump_t
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{
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char *journal_device;
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uint32_t journal_block;
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uint64_t journal_offset;
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uint64_t journal_len;
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uint64_t journal_pos;
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bool all;
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bool started;
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int fd;
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uint32_t crc32_last;
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int dump_block(void *buf);
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};
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int main(int argc, char *argv[])
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{
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journal_dump_t self = { 0 };
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int b = 1;
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if (argc >= 2 && !strcmp(argv[1], "--all"))
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{
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self.all = true;
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b = 2;
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}
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if (argc < b+4)
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{
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printf("USAGE: %s [--all] <journal_file> <journal_block_size> <offset> <size>\n", argv[0]);
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return 1;
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}
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self.journal_device = argv[b];
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self.journal_block = strtoul(argv[b+1], NULL, 10);
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self.journal_offset = strtoull(argv[b+2], NULL, 10);
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self.journal_len = strtoull(argv[b+3], NULL, 10);
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if (self.journal_block < MEM_ALIGNMENT || (self.journal_block % MEM_ALIGNMENT) ||
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self.journal_block > 128*1024)
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{
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printf("Invalid journal block size\n");
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return 1;
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}
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self.fd = open(self.journal_device, O_DIRECT|O_RDONLY);
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if (self.fd == -1)
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{
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printf("Failed to open journal\n");
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return 1;
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}
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void *data = memalign(MEM_ALIGNMENT, self.journal_block);
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self.journal_pos = 0;
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if (self.all)
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{
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while (self.journal_pos < self.journal_len)
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{
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int r = pread(self.fd, data, self.journal_block, self.journal_offset+self.journal_pos);
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assert(r == self.journal_block);
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uint64_t s;
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for (s = 0; s < self.journal_block; s += 8)
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{
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if (*((uint64_t*)(data+s)) != 0)
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break;
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}
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if (s == self.journal_block)
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{
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printf("offset %08lx: zeroes\n", self.journal_pos);
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self.journal_pos += self.journal_block;
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}
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else if (((journal_entry*)data)->magic == JOURNAL_MAGIC)
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{
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printf("offset %08lx:\n", self.journal_pos);
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self.dump_block(data);
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}
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else
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{
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printf("offset %08lx: no magic in the beginning, looks like random data (pattern=%lx)\n", self.journal_pos, *((uint64_t*)data));
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self.journal_pos += self.journal_block;
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}
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}
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}
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else
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{
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int r = pread(self.fd, data, self.journal_block, self.journal_offset+self.journal_pos);
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assert(r == self.journal_block);
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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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printf("offset %08lx: journal superblock is invalid\n", self.journal_pos);
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}
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else
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{
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printf("offset %08lx:\n", self.journal_pos);
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self.dump_block(data);
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self.started = false;
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self.journal_pos = je->start.journal_start;
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while (1)
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{
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if (self.journal_pos >= self.journal_len)
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self.journal_pos = self.journal_block;
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r = pread(self.fd, data, self.journal_block, self.journal_offset+self.journal_pos);
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assert(r == self.journal_block);
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printf("offset %08lx:\n", self.journal_pos);
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r = self.dump_block(data);
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if (r <= 0)
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{
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printf("end of the journal\n");
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break;
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}
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}
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}
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}
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free(data);
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close(self.fd);
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return 0;
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}
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int journal_dump_t::dump_block(void *buf)
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{
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uint32_t pos = 0;
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journal_pos += journal_block;
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int entry = 0;
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bool wrapped = false;
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while (pos < journal_block)
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{
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journal_entry *je = (journal_entry*)(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)
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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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printf("entry % 3d: crc32=%08x %s prev=%08x ", entry, je->crc32, (crc32_valid ? "(valid)" : "(invalid)"), je->crc32_prev);
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if (je->type == JE_START)
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{
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printf("je_start start=%08lx\n", je->start.journal_start);
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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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"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_pos + je->small_write.len > journal_len)
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{
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// data continues from the beginning of the journal
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journal_pos = journal_block;
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wrapped = true;
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}
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if (journal_pos != je->small_write.data_offset)
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{
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printf(" (mismatched, calculated = %lu)", journal_pos);
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}
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journal_pos += je->small_write.len;
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if (journal_pos >= journal_len)
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{
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journal_pos = journal_block;
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wrapped = true;
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}
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uint32_t data_crc32 = 0;
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void *data = memalign(MEM_ALIGNMENT, je->small_write.len);
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assert(pread(fd, data, je->small_write.len, journal_offset+je->small_write.data_offset) == je->small_write.len);
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data_crc32 = crc32c(0, data, je->small_write.len);
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free(data);
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printf(
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" data_crc32=%08x%s", je->small_write.crc32_data,
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(data_crc32 != je->small_write.crc32_data) ? " (invalid)" : " (valid)"
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);
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printf("\n");
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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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"je_big_write%s oid=%lx:%lx ver=%lu loc=%08lx\n",
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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, je->big_write.version, je->big_write.location
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);
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}
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else if (je->type == JE_STABLE)
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{
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printf("je_stable oid=%lx:%lx ver=%lu\n", je->stable.oid.inode, je->stable.oid.stripe, je->stable.version);
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}
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else if (je->type == JE_ROLLBACK)
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{
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printf("je_rollback oid=%lx:%lx ver=%lu\n", je->rollback.oid.inode, je->rollback.oid.stripe, je->rollback.version);
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}
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else if (je->type == JE_DELETE)
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{
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printf("je_delete oid=%lx:%lx ver=%lu\n", je->del.oid.inode, je->del.oid.stripe, je->del.version);
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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 = journal_len;
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}
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return entry;
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}
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