diff options
Diffstat (limited to 'lib/tdb/common/traverse.c')
| -rw-r--r-- | lib/tdb/common/traverse.c | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/lib/tdb/common/traverse.c b/lib/tdb/common/traverse.c index 07b0c23858..8e5a63a5ec 100644 --- a/lib/tdb/common/traverse.c +++ b/lib/tdb/common/traverse.c @@ -27,8 +27,11 @@ #include "tdb_private.h" -/* Uses traverse lock: 0 = finish, -1 = error, other = record offset */ -static int tdb_next_lock(struct tdb_context *tdb, struct tdb_traverse_lock *tlock, +#define TDB_NEXT_LOCK_ERR ((tdb_off_t)-1) + +/* Uses traverse lock: 0 = finish, TDB_NEXT_LOCK_ERR = error, + other = record offset */ +static tdb_off_t tdb_next_lock(struct tdb_context *tdb, struct tdb_traverse_lock *tlock, struct list_struct *rec) { int want_next = (tlock->off != 0); @@ -71,7 +74,7 @@ static int tdb_next_lock(struct tdb_context *tdb, struct tdb_traverse_lock *tloc } if (tdb_lock(tdb, tlock->hash, tlock->lock_rw) == -1) - return -1; + return TDB_NEXT_LOCK_ERR; /* No previous record? Start at top of chain. */ if (!tlock->off) { @@ -99,6 +102,7 @@ static int tdb_next_lock(struct tdb_context *tdb, struct tdb_traverse_lock *tloc /* Detect infinite loops. From "Shlomi Yaakobovich" <Shlomi@exanet.com>. */ if (tlock->off == rec->next) { + tdb->ecode = TDB_ERR_CORRUPT; TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_next_lock: loop detected.\n")); goto fail; } @@ -127,7 +131,7 @@ static int tdb_next_lock(struct tdb_context *tdb, struct tdb_traverse_lock *tloc tlock->off = 0; if (tdb_unlock(tdb, tlock->hash, tlock->lock_rw) != 0) TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_next_lock: On error unlock failed!\n")); - return -1; + return TDB_NEXT_LOCK_ERR; } /* traverse the entire database - calling fn(tdb, key, data) on each element. @@ -141,7 +145,8 @@ static int tdb_traverse_internal(struct tdb_context *tdb, { TDB_DATA key, dbuf; struct list_struct rec; - int ret, count = 0; + int ret = 0, count = 0; + tdb_off_t off; /* This was in the initializaton, above, but the IRIX compiler * did not like it. crh @@ -152,7 +157,11 @@ static int tdb_traverse_internal(struct tdb_context *tdb, tdb->travlocks.next = tl; /* tdb_next_lock places locks on the record returned, and its chain */ - while ((ret = tdb_next_lock(tdb, tl, &rec)) > 0) { + while ((off = tdb_next_lock(tdb, tl, &rec)) != 0) { + if (off == TDB_NEXT_LOCK_ERR) { + ret = -1; + goto out; + } count++; /* now read the full record */ key.dptr = tdb_alloc_read(tdb, tl->off + sizeof(rec), @@ -177,7 +186,6 @@ static int tdb_traverse_internal(struct tdb_context *tdb, } if (fn && fn(tdb, key, dbuf, private_data)) { /* They want us to terminate traversal */ - ret = count; if (tdb_unlock_record(tdb, tl->off) != 0) { TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_traverse: unlock_record failed!\n"));; ret = -1; @@ -256,6 +264,7 @@ TDB_DATA tdb_firstkey(struct tdb_context *tdb) { TDB_DATA key; struct list_struct rec; + tdb_off_t off; /* release any old lock */ if (tdb_unlock_record(tdb, tdb->travlocks.off) != 0) @@ -264,7 +273,8 @@ TDB_DATA tdb_firstkey(struct tdb_context *tdb) tdb->travlocks.lock_rw = F_RDLCK; /* Grab first record: locks chain and returned record. */ - if (tdb_next_lock(tdb, &tdb->travlocks, &rec) <= 0) + off = tdb_next_lock(tdb, &tdb->travlocks, &rec); + if (off == 0 || off == TDB_NEXT_LOCK_ERR) return tdb_null; /* now read the key */ key.dsize = rec.key_len; @@ -283,6 +293,7 @@ TDB_DATA tdb_nextkey(struct tdb_context *tdb, TDB_DATA oldkey) TDB_DATA key = tdb_null; struct list_struct rec; unsigned char *k = NULL; + tdb_off_t off; /* Is locked key the old key? If so, traverse will be reliable. */ if (tdb->travlocks.off) { @@ -322,7 +333,8 @@ TDB_DATA tdb_nextkey(struct tdb_context *tdb, TDB_DATA oldkey) /* Grab next record: locks chain and returned record, unlocks old record */ - if (tdb_next_lock(tdb, &tdb->travlocks, &rec) > 0) { + off = tdb_next_lock(tdb, &tdb->travlocks, &rec); + if (off != TDB_NEXT_LOCK_ERR && off != 0) { key.dsize = rec.key_len; key.dptr = tdb_alloc_read(tdb, tdb->travlocks.off+sizeof(rec), key.dsize); |