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Diffstat (limited to 'source4/lib/tdb/tdb.c')
-rw-r--r--source4/lib/tdb/tdb.c91
1 files changed, 67 insertions, 24 deletions
diff --git a/source4/lib/tdb/tdb.c b/source4/lib/tdb/tdb.c
index 513fbce519..fc210f42d4 100644
--- a/source4/lib/tdb/tdb.c
+++ b/source4/lib/tdb/tdb.c
@@ -20,6 +20,27 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+
+
+/* NOTE: If you use tdbs under valgrind, and in particular if you run
+ * tdbtorture, you may get spurious "uninitialized value" warnings. I
+ * think this is because valgrind doesn't understand that the mmap'd
+ * area may be written to by other processes. Memory can, from the
+ * point of view of the grinded process, spontaneously become
+ * initialized.
+ *
+ * I can think of a few solutions. [mbp 20030311]
+ *
+ * 1 - Write suppressions for Valgrind so that it doesn't complain
+ * about this. Probably the most reasonable but people need to
+ * remember to use them.
+ *
+ * 2 - Use IO not mmap when running under valgrind. Not so nice.
+ *
+ * 3 - Use the special valgrind macros to mark memory as valid at the
+ * right time. Probably too hard -- the process just doesn't know.
+ */
+
#ifdef STANDALONE
#if HAVE_CONFIG_H
#include <config.h>
@@ -56,6 +77,8 @@
#define TDB_DEAD(r) ((r)->magic == TDB_DEAD_MAGIC)
#define TDB_BAD_MAGIC(r) ((r)->magic != TDB_MAGIC && !TDB_DEAD(r))
#define TDB_HASH_TOP(hash) (FREELIST_TOP + (BUCKET(hash)+1)*sizeof(tdb_off))
+#define TDB_DATA_START(hash_size) (TDB_HASH_TOP(hash_size-1) + TDB_SPINLOCK_SIZE(hash_size))
+
/* NB assumes there is a local variable called "tdb" that is the
* current context, also takes doubly-parenthesized print-style
@@ -214,10 +237,15 @@ static int tdb_brlock(TDB_CONTEXT *tdb, tdb_off offset,
tdb->fd, offset, rw_type, lck_type));
}
/* Was it an alarm timeout ? */
- if (errno == EINTR && palarm_fired && *palarm_fired)
+ if (errno == EINTR && palarm_fired && *palarm_fired) {
+ TDB_LOG((tdb, 5, "tdb_brlock timed out (fd=%d) at offset %d rw_type=%d lck_type=%d\n",
+ tdb->fd, offset, rw_type, lck_type));
return TDB_ERRCODE(TDB_ERR_LOCK_TIMEOUT, -1);
+ }
/* Otherwise - generic lock error. */
/* errno set by fcntl */
+ TDB_LOG((tdb, 5, "tdb_brlock failed (fd=%d) at offset %d rw_type=%d lck_type=%d: %s\n",
+ tdb->fd, offset, rw_type, lck_type, strerror(errno)));
return TDB_ERRCODE(TDB_ERR_LOCK, -1);
}
return 0;
@@ -642,10 +670,10 @@ static int tdb_free(TDB_CONTEXT *tdb, tdb_off offset, struct list_struct *rec)
left:
/* Look left */
left = offset - sizeof(tdb_off);
- if (left > TDB_HASH_TOP(tdb->header.hash_size-1)) {
+ if (left > TDB_DATA_START(tdb->header.hash_size)) {
struct list_struct l;
tdb_off leftsize;
-
+
/* Read in tailer and jump back to header */
if (ofs_read(tdb, left, &leftsize) == -1) {
TDB_LOG((tdb, 0, "tdb_free: left offset read failed at %u\n", left));
@@ -994,12 +1022,11 @@ static int tdb_keylocked(TDB_CONTEXT *tdb, u32 hash)
}
/* As tdb_find, but if you succeed, keep the lock */
-static tdb_off tdb_find_lock(TDB_CONTEXT *tdb, TDB_DATA key, int locktype,
+static tdb_off tdb_find_lock_hash(TDB_CONTEXT *tdb, TDB_DATA key, u32 hash, int locktype,
struct list_struct *rec)
{
- u32 hash, rec_ptr;
+ u32 rec_ptr;
- hash = tdb_hash(&key);
if (!tdb_keylocked(tdb, hash))
return 0;
if (tdb_lock(tdb, BUCKET(hash), locktype) == -1)
@@ -1040,13 +1067,13 @@ const char *tdb_errorstr(TDB_CONTEXT *tdb)
on failure return -1.
*/
-static int tdb_update(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf)
+static int tdb_update_hash(TDB_CONTEXT *tdb, TDB_DATA key, u32 hash, TDB_DATA dbuf)
{
struct list_struct rec;
tdb_off rec_ptr;
/* find entry */
- if (!(rec_ptr = tdb_find(tdb, key, tdb_hash(&key), &rec)))
+ if (!(rec_ptr = tdb_find(tdb, key, hash, &rec)))
return -1;
/* must be long enough key, data and tailer */
@@ -1080,9 +1107,11 @@ TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key)
tdb_off rec_ptr;
struct list_struct rec;
TDB_DATA ret;
+ u32 hash;
/* find which hash bucket it is in */
- if (!(rec_ptr = tdb_find_lock(tdb,key,F_RDLCK,&rec)))
+ hash = tdb_hash(&key);
+ if (!(rec_ptr = tdb_find_lock_hash(tdb,key,hash,F_RDLCK,&rec)))
return tdb_null;
if (rec.data_len)
@@ -1101,16 +1130,22 @@ TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key)
this doesn't match the conventions in the rest of this module, but is
compatible with gdbm
*/
-int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key)
+static int tdb_exists_hash(TDB_CONTEXT *tdb, TDB_DATA key, u32 hash)
{
struct list_struct rec;
- if (tdb_find_lock(tdb, key, F_RDLCK, &rec) == 0)
+ if (tdb_find_lock_hash(tdb, key, hash, F_RDLCK, &rec) == 0)
return 0;
tdb_unlock(tdb, BUCKET(rec.full_hash), F_RDLCK);
return 1;
}
+int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key)
+{
+ u32 hash = tdb_hash(&key);
+ return tdb_exists_hash(tdb, key, hash);
+}
+
/* record lock stops delete underneath */
static int lock_record(TDB_CONTEXT *tdb, tdb_off off)
{
@@ -1236,7 +1271,8 @@ static int tdb_next_lock(TDB_CONTEXT *tdb, struct tdb_traverse_lock *tlock,
/* Try to clean dead ones from old traverses */
current = tlock->off;
tlock->off = rec->next;
- if (do_delete(tdb, current, rec) != 0)
+ if (!tdb->read_only &&
+ do_delete(tdb, current, rec) != 0)
goto fail;
}
tdb_unlock(tdb, tlock->hash, F_WRLCK);
@@ -1366,7 +1402,7 @@ TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA oldkey)
if (!tdb->travlocks.off) {
/* No previous element: do normal find, and lock record */
- tdb->travlocks.off = tdb_find_lock(tdb, oldkey, F_WRLCK, &rec);
+ tdb->travlocks.off = tdb_find_lock_hash(tdb, oldkey, tdb_hash(&oldkey), F_WRLCK, &rec);
if (!tdb->travlocks.off)
return tdb_null;
tdb->travlocks.hash = BUCKET(rec.full_hash);
@@ -1394,13 +1430,13 @@ TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA oldkey)
}
/* delete an entry in the database given a key */
-int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key)
+static int tdb_delete_hash(TDB_CONTEXT *tdb, TDB_DATA key, u32 hash)
{
tdb_off rec_ptr;
struct list_struct rec;
int ret;
- if (!(rec_ptr = tdb_find_lock(tdb, key, F_WRLCK, &rec)))
+ if (!(rec_ptr = tdb_find_lock_hash(tdb, key, hash, F_WRLCK, &rec)))
return -1;
ret = do_delete(tdb, rec_ptr, &rec);
if (tdb_unlock(tdb, BUCKET(rec.full_hash), F_WRLCK) != 0)
@@ -1408,6 +1444,12 @@ int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key)
return ret;
}
+int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key)
+{
+ u32 hash = tdb_hash(&key);
+ return tdb_delete_hash(tdb, key, hash);
+}
+
/* store an element in the database, replacing any existing element
with the same key
@@ -1430,13 +1472,13 @@ int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag)
/* check for it existing, on insert. */
if (flag == TDB_INSERT) {
- if (tdb_exists(tdb, key)) {
+ if (tdb_exists_hash(tdb, key, hash)) {
tdb->ecode = TDB_ERR_EXISTS;
goto fail;
}
} else {
/* first try in-place update, on modify or replace. */
- if (tdb_update(tdb, key, dbuf) == 0)
+ if (tdb_update_hash(tdb, key, hash, dbuf) == 0)
goto out;
if (flag == TDB_MODIFY && tdb->ecode == TDB_ERR_NOEXIST)
goto fail;
@@ -1448,7 +1490,7 @@ int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag)
care. Doing this first reduces fragmentation, and avoids
coalescing with `allocated' block before it's updated. */
if (flag != TDB_INSERT)
- tdb_delete(tdb, key);
+ tdb_delete_hash(tdb, key, hash);
/* Copy key+value *before* allocating free space in case malloc
fails and we are left with a dead spot in the tdb. */
@@ -1497,13 +1539,13 @@ fail:
is <= the old data size and the key exists.
on failure return -1. Record must be locked before calling.
*/
-static int tdb_append_inplace(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA new_dbuf)
+static int tdb_append_inplace(TDB_CONTEXT *tdb, TDB_DATA key, u32 hash, TDB_DATA new_dbuf)
{
struct list_struct rec;
tdb_off rec_ptr;
/* find entry */
- if (!(rec_ptr = tdb_find(tdb, key, tdb_hash(&key), &rec)))
+ if (!(rec_ptr = tdb_find(tdb, key, hash, &rec)))
return -1;
/* Append of 0 is always ok. */
@@ -1545,7 +1587,7 @@ int tdb_append(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA new_dbuf)
return -1;
/* first try in-place. */
- if (tdb_append_inplace(tdb, key, new_dbuf) == 0)
+ if (tdb_append_inplace(tdb, key, hash, new_dbuf) == 0)
goto out;
/* reset the error code potentially set by the tdb_append_inplace() */
@@ -1588,7 +1630,7 @@ int tdb_append(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA new_dbuf)
care. Doing this first reduces fragmentation, and avoids
coalescing with `allocated' block before it's updated. */
- tdb_delete(tdb, key);
+ tdb_delete_hash(tdb, key, hash);
if (!(rec_ptr = tdb_allocate(tdb, key.dsize + new_data_size, &rec)))
goto fail;
@@ -1728,8 +1770,7 @@ TDB_CONTEXT *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
if (read(tdb->fd, &tdb->header, sizeof(tdb->header)) != sizeof(tdb->header)
|| strcmp(tdb->header.magic_food, TDB_MAGIC_FOOD) != 0
- || tdb->header.version != TDB_VERSION
- || (tdb->header.hash_size != hash_size
+ || (tdb->header.version != TDB_VERSION
&& !(rev = (tdb->header.version==TDB_BYTEREV(TDB_VERSION))))) {
/* its not a valid database - possibly initialise it */
if (!(open_flags & O_CREAT) || tdb_new_database(tdb, hash_size) == -1) {
@@ -1934,6 +1975,8 @@ int tdb_lockkeys(TDB_CONTEXT *tdb, u32 number, TDB_DATA keys[])
void tdb_unlockkeys(TDB_CONTEXT *tdb)
{
u32 i;
+ if (!tdb->lockedkeys)
+ return;
for (i = 0; i < tdb->lockedkeys[0]; i++)
tdb_unlock(tdb, tdb->lockedkeys[i+1], F_WRLCK);
SAFE_FREE(tdb->lockedkeys);
generated by cgit (git 2.34.1) at 2024-12-18 23:11:43 +0000