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authorKent Overstreet <kmo@daterainc.com>2014-04-11 00:58:49 (GMT)
committerKent Overstreet <kmo@daterainc.com>2014-08-04 22:23:02 (GMT)
commit9aa61a992acceeec0d1de2cd99938421498659d5 (patch)
treed414fdba809e0193f0d19d5ea80180ef96f3a23e
parent5b1016e62f74c53e0330403025954c8d95384c03 (diff)
downloadlinux-9aa61a992acceeec0d1de2cd99938421498659d5.tar.xz
bcache: Fix a journal replay bug
journal replay wansn't validating pointers with bch_extent_invalid() before derefing, fixed Signed-off-by: Kent Overstreet <kmo@daterainc.com>
-rw-r--r--drivers/md/bcache/extents.c13
-rw-r--r--drivers/md/bcache/extents.h1
-rw-r--r--drivers/md/bcache/journal.c16
3 files changed, 19 insertions, 11 deletions
diff --git a/drivers/md/bcache/extents.c b/drivers/md/bcache/extents.c
index 3a0de4c..243de0bf 100644
--- a/drivers/md/bcache/extents.c
+++ b/drivers/md/bcache/extents.c
@@ -474,9 +474,8 @@ out:
return false;
}
-static bool bch_extent_invalid(struct btree_keys *bk, const struct bkey *k)
+bool __bch_extent_invalid(struct cache_set *c, const struct bkey *k)
{
- struct btree *b = container_of(bk, struct btree, keys);
char buf[80];
if (!KEY_SIZE(k))
@@ -485,16 +484,22 @@ static bool bch_extent_invalid(struct btree_keys *bk, const struct bkey *k)
if (KEY_SIZE(k) > KEY_OFFSET(k))
goto bad;
- if (__ptr_invalid(b->c, k))
+ if (__ptr_invalid(c, k))
goto bad;
return false;
bad:
bch_extent_to_text(buf, sizeof(buf), k);
- cache_bug(b->c, "spotted extent %s: %s", buf, bch_ptr_status(b->c, k));
+ cache_bug(c, "spotted extent %s: %s", buf, bch_ptr_status(c, k));
return true;
}
+static bool bch_extent_invalid(struct btree_keys *bk, const struct bkey *k)
+{
+ struct btree *b = container_of(bk, struct btree, keys);
+ return __bch_extent_invalid(b->c, k);
+}
+
static bool bch_extent_bad_expensive(struct btree *b, const struct bkey *k,
unsigned ptr)
{
diff --git a/drivers/md/bcache/extents.h b/drivers/md/bcache/extents.h
index e4e2340..e2ed540 100644
--- a/drivers/md/bcache/extents.h
+++ b/drivers/md/bcache/extents.h
@@ -9,5 +9,6 @@ struct cache_set;
void bch_extent_to_text(char *, size_t, const struct bkey *);
bool __bch_btree_ptr_invalid(struct cache_set *, const struct bkey *);
+bool __bch_extent_invalid(struct cache_set *, const struct bkey *);
#endif /* _BCACHE_EXTENTS_H */
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index 59e8202..363b881 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -7,6 +7,7 @@
#include "bcache.h"
#include "btree.h"
#include "debug.h"
+#include "extents.h"
#include <trace/events/bcache.h>
@@ -291,15 +292,16 @@ void bch_journal_mark(struct cache_set *c, struct list_head *list)
for (k = i->j.start;
k < bset_bkey_last(&i->j);
- k = bkey_next(k)) {
- unsigned j;
+ k = bkey_next(k))
+ if (!__bch_extent_invalid(c, k)) {
+ unsigned j;
- for (j = 0; j < KEY_PTRS(k); j++)
- if (ptr_available(c, k, j))
- atomic_inc(&PTR_BUCKET(c, k, j)->pin);
+ for (j = 0; j < KEY_PTRS(k); j++)
+ if (ptr_available(c, k, j))
+ atomic_inc(&PTR_BUCKET(c, k, j)->pin);
- bch_initial_mark_key(c, 0, k);
- }
+ bch_initial_mark_key(c, 0, k);
+ }
}
}