forked from vitalif/vitastor
Dump only actual part of the journal by default
parent
78fbaacf1f
commit
28be049909
109
dump_journal.cpp
109
dump_journal.cpp
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@ -26,23 +26,32 @@ struct journal_dump_t
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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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void dump_block(void *buf);
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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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if (argc < 5)
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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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printf("USAGE: %s <journal_file> <journal_block_size> <offset> <size>\n", argv[0]);
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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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journal_dump_t self;
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self.journal_device = argv[1];
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self.journal_block = strtoul(argv[2], NULL, 10);
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self.journal_offset = strtoull(argv[3], NULL, 10);
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self.journal_len = strtoull(argv[4], NULL, 10);
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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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@ -57,30 +66,64 @@ int main(int argc, char *argv[])
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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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while (self.journal_pos < self.journal_len)
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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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uint64_t s;
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for (s = 0; s < self.journal_block; s += 8)
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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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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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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: 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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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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@ -88,7 +131,7 @@ int main(int argc, char *argv[])
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return 0;
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}
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void journal_dump_t::dump_block(void *buf)
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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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@ -97,12 +140,19 @@ void journal_dump_t::dump_block(void *buf)
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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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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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const char *crc32_valid = je_crc32(je) == je->crc32 ? "(valid)" : "(invalid)";
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printf("entry % 3d: crc32=%08x %s prev=%08x ", entry, je->crc32, crc32_valid, je->crc32_prev);
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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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@ -170,4 +220,5 @@ void journal_dump_t::dump_block(void *buf)
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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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