static int __read_je_payload(struct super_block *sb, u64 ofs,
struct logfs_journal_header *jh)
{
u16 len;
int err;
len = be16_to_cpu(jh->h_len);
err = wbuf_read(sb, ofs + sizeof(*jh), len, jh + 1);
if (err)
return err;
if (jh->h_crc != logfs_crc32(jh, len + sizeof(*jh), 4)) {
if (jh->h_crc == logfs_crc32(jh, len, 4))
WARN_ON_ONCE(1);
else
return -EIO;
}
return 0;
}
static u64 read_gec(struct super_block *sb, u32 segno)
{
struct logfs_segment_header sh;
__be32 crc;
int err;
if (!segno)
return 0;
err = wbuf_read(sb, dev_ofs(sb, segno, 0), sizeof(sh), &sh);
if (err)
return 0;
crc = logfs_crc32(&sh, sizeof(sh), 4);
if (crc != sh.crc) {
WARN_ON(sh.gec != cpu_to_be64(0xffffffffffffffffull));
return 0;
}
return be64_to_cpu(sh.gec);
}
static int __read_je_payload(struct super_block *sb, u64 ofs,
struct logfs_journal_header *jh)
{
u16 len;
int err;
len = be16_to_cpu(jh->h_len);
err = wbuf_read(sb, ofs + sizeof(*jh), len, jh + 1);
if (err)
return err;
if (jh->h_crc != logfs_crc32(jh, len + sizeof(*jh), 4)) {
/* Old code was confused. It forgot about the header length
* and stopped calculating the crc 16 bytes before the end
* of data - ick!
* FIXME: Remove this hack once the old code is fixed.
*/
if (jh->h_crc == logfs_crc32(jh, len, 4))
WARN_ON_ONCE(1);
else
return -EIO;
}
return 0;
}
static int __read_je_header(struct super_block *sb, u64 ofs,
struct logfs_journal_header *jh)
{
struct logfs_super *super = logfs_super(sb);
size_t bufsize = max_t(size_t, sb->s_blocksize, super->s_writesize)
+ MAX_JOURNAL_HEADER;
u16 type, len, datalen;
int err;
err = wbuf_read(sb, ofs, sizeof(*jh), jh);
if (err)
return err;
type = be16_to_cpu(jh->h_type);
len = be16_to_cpu(jh->h_len);
datalen = be16_to_cpu(jh->h_datalen);
if (len > sb->s_blocksize)
return -EIO;
if ((type < JE_FIRST) || (type > JE_LAST))
return -EIO;
if (datalen > bufsize)
return -EIO;
return 0;
}
