static errcode_t walk_journal(ocfs2_filesys *fs, int slot,
struct journal_info *ji, char *buf, int recover)
{
errcode_t err, ret = 0;
uint32_t next_seq;
uint64_t next_block, nr;
journal_superblock_t *jsb = ji->ji_jsb;
journal_header_t jh;
next_seq = jsb->s_sequence;
next_block = jsb->s_start;
/* s_start == 0 when we have nothing to do */
if (next_block == 0)
return 0;
/* ret is set when bad tags are seen in the first scan and when there
* are io errors in the recovery scan. Only stop walking the journal
* when bad tags are seen in the first scan. */
while(recover || !ret) {
verbosef("next_seq %"PRIu32" final_seq %"PRIu32" next_block "
"%"PRIu64"\n", next_seq, ji->ji_final_seq,
next_block);
if (recover && seq_geq(next_seq, ji->ji_final_seq))
break;
/* only mark the blocks used on the first pass */
err = read_journal_block(fs, ji, next_block, buf, !recover);
if (err) {
ret = err;
break;
}
next_block = jwrap(jsb, next_block + 1);
memcpy(&jh, buf, sizeof(jh));
jh.h_magic = be32_to_cpu(jh.h_magic);
jh.h_blocktype = be32_to_cpu(jh.h_blocktype);
jh.h_sequence = be32_to_cpu(jh.h_sequence);
verbosef("jh magic %x\n", jh.h_magic);
if (jh.h_magic != JBD2_MAGIC_NUMBER)
break;
verbosef("jh block %x\n", jh.h_blocktype);
verbosef("jh seq %"PRIu32"\n", jh.h_sequence);
if (jh.h_sequence != next_seq)
break;
switch(jh.h_blocktype) {
case JBD2_DESCRIPTOR_BLOCK:
verbosef("found a desc type %x\n", jh.h_blocktype);
/* replay the blocks described in the desc block */
if (recover) {
err = replay_blocks(fs, ji, buf, next_seq,
&next_block);
if (err)
ret = err;
continue;
}
/* just record the blocks as used and carry on */
err = count_tags(fs, jsb, buf, &nr);
if (err)
ret = err;
else
next_block = jwrap(jsb, next_block + nr);
break;
case JBD2_COMMIT_BLOCK:
verbosef("found a commit type %x\n", jh.h_blocktype);
next_seq++;
break;
case JBD2_REVOKE_BLOCK:
verbosef("found a revoke type %x\n", jh.h_blocktype);
add_revoke_records(ji, buf, jsb->s_blocksize,
next_seq);
break;
default:
verbosef("unknown type %x\n", jh.h_blocktype);
break;
}
}
verbosef("done scanning with seq %"PRIu32"\n", next_seq);
if (!recover) {
ji->ji_set_final_seq = 1;
ji->ji_final_seq = next_seq;
} else if (ji->ji_final_seq != next_seq) {
printf("Replaying slot %d's journal stopped at seq %"PRIu32" "
"but an initial scan indicated that it should have "
"stopped at seq %"PRIu32"\n", ji->ji_slot, next_seq,
ji->ji_final_seq);
if (ret == 0)
err = OCFS2_ET_IO;
}
return ret;
}
static void dump_journal(char *cmdname, FILE *out_file,
struct journal_source *source)
{
struct ext2_super_block *sb;
char jsb_buffer[1024];
char buf[8192];
journal_superblock_t *jsb;
unsigned int blocksize = 1024;
unsigned int got;
int retval;
__u32 magic, sequence, blocktype;
journal_header_t *header;
tid_t transaction;
unsigned int blocknr = 0;
/* First, check to see if there's an ext2 superblock header */
retval = read_journal_block(cmdname, source, 0,
buf, 2048, &got);
if (retval)
return;
jsb = (journal_superblock_t *) buf;
sb = (struct ext2_super_block *) (buf+1024);
#ifdef ENABLE_SWAPFS
if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
ext2fs_swap_super(sb);
#endif
if ((be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) &&
(sb->s_magic == EXT2_SUPER_MAGIC) &&
(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
blocksize = EXT2_BLOCK_SIZE(sb);
blocknr = (blocksize == 1024) ? 2 : 1;
uuid_unparse(sb->s_uuid, jsb_buffer);
fprintf(out_file, "Ext2 superblock header found.\n");
if (dump_all) {
fprintf(out_file, "\tuuid=%s\n", jsb_buffer);
fprintf(out_file, "\tblocksize=%d\n", blocksize);
fprintf(out_file, "\tjournal data size %ld\n",
(long) sb->s_blocks_count);
}
}
/* Next, read the journal superblock */
retval = read_journal_block(cmdname, source, blocknr*blocksize,
jsb_buffer, 1024, &got);
if (retval)
return;
jsb = (journal_superblock_t *) jsb_buffer;
if (be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) {
fprintf(out_file,
"Journal superblock magic number invalid!\n");
return;
}
blocksize = be32_to_cpu(jsb->s_blocksize);
transaction = be32_to_cpu(jsb->s_sequence);
blocknr = be32_to_cpu(jsb->s_start);
fprintf(out_file, "Journal starts at block %u, transaction %u\n",
blocknr, transaction);
if (!blocknr)
/* Empty journal, nothing to do. */
return;
while (1) {
retval = read_journal_block(cmdname, source,
blocknr*blocksize, buf,
blocksize, &got);
if (retval || got != blocksize)
return;
header = (journal_header_t *) buf;
magic = be32_to_cpu(header->h_magic);
sequence = be32_to_cpu(header->h_sequence);
blocktype = be32_to_cpu(header->h_blocktype);
if (magic != JFS_MAGIC_NUMBER) {
fprintf (out_file, "No magic number at block %u: "
"end of journal.\n", blocknr);
return;
}
if (sequence != transaction) {
fprintf (out_file, "Found sequence %u (not %u) at "
"block %u: end of journal.\n",
sequence, transaction, blocknr);
return;
}
if (dump_descriptors) {
fprintf (out_file, "Found expected sequence %u, "
"type %u (%s) at block %u\n",
sequence, blocktype,
type_to_name(blocktype), blocknr);
}
switch (blocktype) {
case JFS_DESCRIPTOR_BLOCK:
dump_descriptor_block(out_file, source, buf, jsb,
&blocknr, blocksize,
transaction);
continue;
case JFS_COMMIT_BLOCK:
transaction++;
blocknr++;
WRAP(jsb, blocknr);
continue;
case JFS_REVOKE_BLOCK:
dump_revoke_block(out_file, buf, jsb,
blocknr, blocksize,
transaction);
blocknr++;
WRAP(jsb, blocknr);
continue;
default:
fprintf (out_file, "Unexpected block type %u at "
"block %u.\n", blocktype, blocknr);
return;
}
}
}
static errcode_t replay_blocks(ocfs2_filesys *fs, struct journal_info *ji,
char *buf, uint64_t seq, uint64_t *next_block)
{
char *tagp;
journal_block_tag_t *tag;
size_t i, num;
char *io_buf = NULL;
errcode_t err, ret = 0;
int tag_bytes = ocfs2_journal_tag_bytes(ji->ji_jsb);
uint32_t t_flags;
uint64_t block64;
tagp = buf + sizeof(journal_header_t);
num = (ji->ji_jsb->s_blocksize - sizeof(journal_header_t)) /
tag_bytes;
ret = ocfs2_malloc_blocks(fs->fs_io, 1, &io_buf);
if (ret) {
com_err(whoami, ret, "while allocating a block buffer");
goto out;
}
for(i = 0; i < num; i++, tagp += tag_bytes, (*next_block)++) {
tag = (journal_block_tag_t *)tagp;
t_flags = be32_to_cpu(tag->t_flags);
block64 = ocfs2_journal_tag_block(tag, tag_bytes);
*next_block = jwrap(ji->ji_jsb, *next_block);
verbosef("recovering journal block %"PRIu64" to disk block "
"%"PRIu64"\n", *next_block, block64);
if (revoke_this_block(&ji->ji_revoke, block64, seq))
goto skip_io;
err = read_journal_block(fs, ji, *next_block, io_buf, 1);
if (err) {
ret = err;
goto skip_io;
}
if (t_flags & JBD2_FLAG_ESCAPE) {
uint32_t magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
memcpy(io_buf, &magic, sizeof(magic));
}
err = io_write_block(fs->fs_io, block64, 1, io_buf);
if (err)
ret = err;
skip_io:
if (t_flags & JBD2_FLAG_LAST_TAG)
i = num; /* be sure to increment next_block */
if (!(t_flags & JBD2_FLAG_SAME_UUID))
tagp += 16;
}
out:
if (io_buf)
ocfs2_free(&io_buf);
return ret;
}