diff options
| author | Kent Overstreet <kmo@daterainc.com> | 2013-08-05 14:04:06 -0700 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-09-02 11:20:15 +0200 |
| commit | b4839e6cd4a236a81725e422b2e05c26fe36048a (patch) | |
| tree | bf0bee6618afc6007707d2997bb68ab183dd9685 /drivers | |
| parent | 2ffe8469f55805a0ce527bdf32ee85857dfad87a (diff) | |
bcache: Minor journal fix
commit b3fa7e77e67e647db3db2166b65083a427d84ed3 upstream.
The real fix is where we check the bytes we need against how much is
remaining - we also need to check for a journal entry bigger than our
buffer, we'll never write those and it would be bad if we tried to read
one.
Also improve the diagnostic messages.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/bcache/journal.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c index 8435f81e5d85..c4943793cb86 100644 --- a/drivers/md/bcache/journal.c +++ b/drivers/md/bcache/journal.c @@ -42,11 +42,11 @@ static int journal_read_bucket(struct cache *ca, struct list_head *list, int ret = 0; sector_t bucket = bucket_to_sector(ca->set, ca->sb.d[bucket_index]); - pr_debug("reading %llu", (uint64_t) bucket); + pr_debug("reading %u", bucket_index); while (offset < ca->sb.bucket_size) { reread: left = ca->sb.bucket_size - offset; - len = min_t(unsigned, left, PAGE_SECTORS * 8); + len = min_t(unsigned, left, PAGE_SECTORS << JSET_BITS); bio_reset(bio); bio->bi_sector = bucket + offset; @@ -72,17 +72,26 @@ reread: left = ca->sb.bucket_size - offset; struct list_head *where; size_t blocks, bytes = set_bytes(j); - if (j->magic != jset_magic(ca->set)) + if (j->magic != jset_magic(ca->set)) { + pr_debug("%u: bad magic", bucket_index); return ret; + } - if (bytes > left << 9) + if (bytes > left << 9 || + bytes > PAGE_SIZE << JSET_BITS) { + pr_info("%u: too big, %zu bytes, offset %u", + bucket_index, bytes, offset); return ret; + } if (bytes > len << 9) goto reread; - if (j->csum != csum_set(j)) + if (j->csum != csum_set(j)) { + pr_info("%u: bad csum, %zu bytes, offset %u", + bucket_index, bytes, offset); return ret; + } blocks = set_blocks(j, ca->set); |