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authorRusty Russell <rusty@rustcorp.com.au>2011-04-19 21:00:59 +0930
committerRusty Russell <rusty@rustcorp.com.au>2011-04-19 14:15:22 +0200
commit36cfa7b79e36d880cdbf24d0769558be44d0edda (patch)
tree44d8d98a75a90215877ae336fad29bb4d3f30f88
parentcb884186a55c9ef8aca6ee48b16423b3c881e689 (diff)
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tdb: make sure we skip over recovery area correctly.
If it's really the recovery area, we can trust the rec_len field, and don't have to go groping for bitpatterns. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Autobuild-User: Rusty Russell <rusty@rustcorp.com.au> Autobuild-Date: Tue Apr 19 14:15:22 CEST 2011 on sn-devel-104
-rw-r--r--lib/tdb/common/summary.c13
-rw-r--r--lib/tdb/common/tdb_private.h4
-rw-r--r--lib/tdb/common/transaction.c44
3 files changed, 44 insertions, 17 deletions
diff --git a/lib/tdb/common/summary.c b/lib/tdb/common/summary.c
index b222a5993d..171a1a2055 100644
--- a/lib/tdb/common/summary.c
+++ b/lib/tdb/common/summary.c
@@ -86,12 +86,13 @@ static size_t get_hash_length(struct tdb_context *tdb, unsigned int i)
_PUBLIC_ char *tdb_summary(struct tdb_context *tdb)
{
- tdb_off_t off;
+ tdb_off_t off, rec_off;
struct tally freet, keys, data, dead, extra, hash, uncoal;
struct tdb_record rec;
char *ret = NULL;
bool locked;
size_t len, unc = 0;
+ struct tdb_record recovery;
/* Read-only databases use no locking at all: it's best-effort.
* We may have a write lock already, so skip that case too. */
@@ -103,6 +104,10 @@ _PUBLIC_ char *tdb_summary(struct tdb_context *tdb)
locked = true;
}
+ if (tdb_recovery_area(tdb, tdb->methods, &rec_off, &recovery) != 0) {
+ goto unlock;
+ }
+
tally_init(&freet);
tally_init(&keys);
tally_init(&data);
@@ -135,7 +140,11 @@ _PUBLIC_ char *tdb_summary(struct tdb_context *tdb)
case TDB_RECOVERY_INVALID_MAGIC:
case 0x42424242:
unc++;
- rec.rec_len = tdb_dead_space(tdb, off) - sizeof(rec);
+ /* If it's a valid recovery, we can trust rec_len. */
+ if (off != rec_off) {
+ rec.rec_len = tdb_dead_space(tdb, off)
+ - sizeof(rec);
+ }
/* Fall through */
case TDB_DEAD_MAGIC:
tally_add(&dead, rec.rec_len);
diff --git a/lib/tdb/common/tdb_private.h b/lib/tdb/common/tdb_private.h
index 0186fb9530..140d4ecec5 100644
--- a/lib/tdb/common/tdb_private.h
+++ b/lib/tdb/common/tdb_private.h
@@ -238,6 +238,10 @@ void tdb_release_transaction_locks(struct tdb_context *tdb);
int tdb_transaction_lock(struct tdb_context *tdb, int ltype,
enum tdb_lock_flags lockflags);
int tdb_transaction_unlock(struct tdb_context *tdb, int ltype);
+int tdb_recovery_area(struct tdb_context *tdb,
+ const struct tdb_methods *methods,
+ tdb_off_t *recovery_offset,
+ struct tdb_record *rec);
int tdb_allrecord_lock(struct tdb_context *tdb, int ltype,
enum tdb_lock_flags flags, bool upgradable);
int tdb_allrecord_unlock(struct tdb_context *tdb, int ltype, bool mark_lock);
diff --git a/lib/tdb/common/transaction.c b/lib/tdb/common/transaction.c
index e110a08dbc..e4573cb0a9 100644
--- a/lib/tdb/common/transaction.c
+++ b/lib/tdb/common/transaction.c
@@ -658,6 +658,34 @@ static tdb_len_t tdb_recovery_size(struct tdb_context *tdb)
return recovery_size;
}
+int tdb_recovery_area(struct tdb_context *tdb,
+ const struct tdb_methods *methods,
+ tdb_off_t *recovery_offset,
+ struct tdb_record *rec)
+{
+ if (tdb_ofs_read(tdb, TDB_RECOVERY_HEAD, recovery_offset) == -1) {
+ return -1;
+ }
+
+ if (*recovery_offset == 0) {
+ rec->rec_len = 0;
+ return 0;
+ }
+
+ if (methods->tdb_read(tdb, *recovery_offset, rec, sizeof(*rec),
+ DOCONV()) == -1) {
+ return -1;
+ }
+
+ /* ignore invalid recovery regions: can happen in crash */
+ if (rec->magic != TDB_RECOVERY_MAGIC &&
+ rec->magic != TDB_RECOVERY_INVALID_MAGIC) {
+ *recovery_offset = 0;
+ rec->rec_len = 0;
+ }
+ return 0;
+}
+
/*
allocate the recovery area, or use an existing recovery area if it is
large enough
@@ -671,25 +699,11 @@ static int tdb_recovery_allocate(struct tdb_context *tdb,
const struct tdb_methods *methods = tdb->transaction->io_methods;
tdb_off_t recovery_head;
- if (tdb_ofs_read(tdb, TDB_RECOVERY_HEAD, &recovery_head) == -1) {
+ if (tdb_recovery_area(tdb, methods, &recovery_head, &rec) == -1) {
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_recovery_allocate: failed to read recovery head\n"));
return -1;
}
- rec.rec_len = 0;
-
- if (recovery_head != 0) {
- if (methods->tdb_read(tdb, recovery_head, &rec, sizeof(rec), DOCONV()) == -1) {
- TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_recovery_allocate: failed to read recovery record\n"));
- return -1;
- }
- /* ignore invalid recovery regions: can happen in crash */
- if (rec.magic != TDB_RECOVERY_MAGIC &&
- rec.magic != TDB_RECOVERY_INVALID_MAGIC) {
- recovery_head = 0;
- }
- }
-
*recovery_size = tdb_recovery_size(tdb);
if (recovery_head != 0 && *recovery_size <= rec.rec_len) {