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Dump only actual part of the journal by default

v0.5.2
Vitaliy Filippov 2021-01-01 22:58:53 +03:00
parent 78fbaacf1f
commit 28be049909
1 changed files with 80 additions and 29 deletions
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109
dump_journal.cpp
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@ -26,23 +26,32 @@ struct journal_dump_t
uint64_t journal_offset; uint64_t journal_offset;
uint64_t journal_len; uint64_t journal_len;
uint64_t journal_pos; uint64_t journal_pos;
bool all;
bool started;
int fd; int fd;
uint32_t crc32_last;
void dump_block(void *buf); int dump_block(void *buf);
}; };
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
if (argc < 5) journal_dump_t self = { 0 };
int b = 1;
if (argc >= 2 && !strcmp(argv[1], "--all"))
{ {
printf("USAGE: %s <journal_file> <journal_block_size> <offset> <size>\n", argv[0]); self.all = true;
b = 2;
}
if (argc < b+4)
{
printf("USAGE: %s [--all] <journal_file> <journal_block_size> <offset> <size>\n", argv[0]);
return 1; return 1;
} }
journal_dump_t self; self.journal_device = argv[b];
self.journal_device = argv[1]; self.journal_block = strtoul(argv[b+1], NULL, 10);
self.journal_block = strtoul(argv[2], NULL, 10); self.journal_offset = strtoull(argv[b+2], NULL, 10);
self.journal_offset = strtoull(argv[3], NULL, 10); self.journal_len = strtoull(argv[b+3], NULL, 10);
self.journal_len = strtoull(argv[4], NULL, 10);
if (self.journal_block < MEM_ALIGNMENT || (self.journal_block % MEM_ALIGNMENT) || if (self.journal_block < MEM_ALIGNMENT || (self.journal_block % MEM_ALIGNMENT) ||
self.journal_block > 128*1024) self.journal_block > 128*1024)
{ {
@ -57,30 +66,64 @@ int main(int argc, char *argv[])
} }
void *data = memalign(MEM_ALIGNMENT, self.journal_block); void *data = memalign(MEM_ALIGNMENT, self.journal_block);
self.journal_pos = 0; self.journal_pos = 0;
while (self.journal_pos < self.journal_len) if (self.all)
{
while (self.journal_pos < self.journal_len)
{
int r = pread(self.fd, data, self.journal_block, self.journal_offset+self.journal_pos);
assert(r == self.journal_block);
uint64_t s;
for (s = 0; s < self.journal_block; s += 8)
{
if (*((uint64_t*)(data+s)) != 0)
break;
}
if (s == self.journal_block)
{
printf("offset %08lx: zeroes\n", self.journal_pos);
self.journal_pos += self.journal_block;
}
else if (((journal_entry*)data)->magic == JOURNAL_MAGIC)
{
printf("offset %08lx:\n", self.journal_pos);
self.dump_block(data);
}
else
{
printf("offset %08lx: no magic in the beginning, looks like random data (pattern=%lx)\n", self.journal_pos, *((uint64_t*)data));
self.journal_pos += self.journal_block;
}
}
}
else
{ {
int r = pread(self.fd, data, self.journal_block, self.journal_offset+self.journal_pos); int r = pread(self.fd, data, self.journal_block, self.journal_offset+self.journal_pos);
assert(r == self.journal_block); assert(r == self.journal_block);
uint64_t s; journal_entry *je = (journal_entry*)(data);
for (s = 0; s < self.journal_block; s += 8) if (je->magic != JOURNAL_MAGIC || je->type != JE_START || je_crc32(je) != je->crc32)
{ {
if (*((uint64_t*)(data+s)) != 0) printf("offset %08lx: journal superblock is invalid\n", self.journal_pos);
break;
}
if (s == self.journal_block)
{
printf("offset %08lx: zeroes\n", self.journal_pos);
self.journal_pos += self.journal_block;
}
else if (((journal_entry*)data)->magic == JOURNAL_MAGIC)
{
printf("offset %08lx:\n", self.journal_pos);
self.dump_block(data);
} }
else else
{ {
printf("offset %08lx: no magic in the beginning, looks like random data (pattern=%lx)\n", self.journal_pos, *((uint64_t*)data)); printf("offset %08lx:\n", self.journal_pos);
self.journal_pos += self.journal_block; self.dump_block(data);
self.started = false;
self.journal_pos = je->start.journal_start;
while (1)
{
if (self.journal_pos >= self.journal_len)
self.journal_pos = self.journal_block;
r = pread(self.fd, data, self.journal_block, self.journal_offset+self.journal_pos);
assert(r == self.journal_block);
printf("offset %08lx:\n", self.journal_pos);
r = self.dump_block(data);
if (r <= 0)
{
printf("end of the journal\n");
break;
}
}
} }
} }
free(data); free(data);
@ -88,7 +131,7 @@ int main(int argc, char *argv[])
return 0; return 0;
} }
void journal_dump_t::dump_block(void *buf) int journal_dump_t::dump_block(void *buf)
{ {
uint32_t pos = 0; uint32_t pos = 0;
journal_pos += journal_block; journal_pos += journal_block;
@ -97,12 +140,19 @@ void journal_dump_t::dump_block(void *buf)
while (pos < journal_block) while (pos < journal_block)
{ {
journal_entry *je = (journal_entry*)(buf + pos); journal_entry *je = (journal_entry*)(buf + pos);
if (je->magic != JOURNAL_MAGIC || je->type < JE_MIN || je->type > JE_MAX) if (je->magic != JOURNAL_MAGIC || je->type < JE_MIN || je->type > JE_MAX ||
!all && started && je->crc32_prev != crc32_last)
{ {
break; break;
} }
const char *crc32_valid = je_crc32(je) == je->crc32 ? "(valid)" : "(invalid)"; bool crc32_valid = je_crc32(je) == je->crc32;
printf("entry % 3d: crc32=%08x %s prev=%08x ", entry, je->crc32, crc32_valid, je->crc32_prev); if (!all && !crc32_valid)
{
break;
}
started = true;
crc32_last = je->crc32;
printf("entry % 3d: crc32=%08x %s prev=%08x ", entry, je->crc32, (crc32_valid ? "(valid)" : "(invalid)"), je->crc32_prev);
if (je->type == JE_START) if (je->type == JE_START)
{ {
printf("je_start start=%08lx\n", je->start.journal_start); printf("je_start start=%08lx\n", je->start.journal_start);
@ -170,4 +220,5 @@ void journal_dump_t::dump_block(void *buf)
{ {
journal_pos = journal_len; journal_pos = journal_len;
} }
return entry;
} }