Copyright (C) Andrew Tridgell 1999-2005
Copyright (C) Paul `Rusty' Russell 2000
Copyright (C) Jeremy Allison 2000-2003
-
+
** NOTE! The following LGPL license applies to the tdb
** library. This does NOT imply that all of Samba is released
** under the LGPL
-
+
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
/* all contexts, to ensure no double-opens (fcntl locks don't nest!) */
static struct tdb_context *tdbs = NULL;
-
-/* This is based on the hash algorithm from gdbm */
-static unsigned int default_tdb_hash(TDB_DATA *key)
+/* We use two hashes to double-check they're using the right hash function. */
+void tdb_header_hash(struct tdb_context *tdb,
+ uint32_t *magic1_hash, uint32_t *magic2_hash)
{
- uint32_t value; /* Used to compute the hash value. */
- uint32_t i; /* Used to cycle through random values. */
+ TDB_DATA hash_key;
+ uint32_t tdb_magic = TDB_MAGIC;
- /* Set the initial value from the key size. */
- for (value = 0x238F13AF * key->dsize, i=0; i < key->dsize; i++)
- value = (value + (key->dptr[i] << (i*5 % 24)));
+ hash_key.dptr = (unsigned char *)TDB_MAGIC_FOOD;
+ hash_key.dsize = sizeof(TDB_MAGIC_FOOD);
+ *magic1_hash = tdb->hash_fn(&hash_key);
- return (1103515243 * value + 12345);
-}
+ hash_key.dptr = (unsigned char *)CONVERT(tdb_magic);
+ hash_key.dsize = sizeof(tdb_magic);
+ *magic2_hash = tdb->hash_fn(&hash_key);
+ /* Make sure at least one hash is non-zero! */
+ if (*magic1_hash == 0 && *magic2_hash == 0)
+ *magic1_hash = 1;
+}
/* initialise a new database with a specified hash size */
static int tdb_new_database(struct tdb_context *tdb, int hash_size)
struct tdb_header *newdb;
size_t size;
int ret = -1;
- ssize_t written;
/* We make it up in memory, then write it out if not internal */
size = sizeof(struct tdb_header) + (hash_size+1)*sizeof(tdb_off_t);
/* Fill in the header */
newdb->version = TDB_VERSION;
newdb->hash_size = hash_size;
+
+ tdb_header_hash(tdb, &newdb->magic1_hash, &newdb->magic2_hash);
+
if (tdb->flags & TDB_INTERNAL) {
tdb->map_size = size;
tdb->map_ptr = (char *)newdb;
/* Don't endian-convert the magic food! */
memcpy(newdb->magic_food, TDB_MAGIC_FOOD, strlen(TDB_MAGIC_FOOD)+1);
/* we still have "ret == -1" here */
- written = write(tdb->fd, newdb, size);
- if (written == size) {
- ret = 0;
- } else if (written != -1) {
- /* call write once again, this usually should return -1 and
- * set errno appropriately */
- size -= written;
- written = write(tdb->fd, newdb+written, size);
- if (written == size) {
+ if (tdb_write_all(tdb->fd, newdb, size))
ret = 0;
- } else if (written >= 0) {
- /* a second incomplete write - we give up.
- * guessing the errno... */
- errno = ENOSPC;
- }
- }
fail:
SAFE_FREE(newdb);
ino_t ino)
{
struct tdb_context *i;
-
+
for (i = tdbs; i; i = i->next) {
if (i->device == device && i->inode == ino) {
return 1;
unsigned char *vp;
uint32_t vertest;
unsigned v;
+ uint32_t magic1_hash;
+ uint32_t magic2_hash;
+ const char *hash_alg;
if (!(tdb = (struct tdb_context *)calloc(1, sizeof *tdb))) {
/* Can't log this */
}
tdb_io_init(tdb);
tdb->fd = -1;
+#ifdef TDB_TRACE
+ tdb->tracefd = -1;
+#endif
tdb->name = NULL;
tdb->map_ptr = NULL;
tdb->flags = tdb_flags;
tdb->log.log_fn = null_log_fn;
tdb->log.log_private = NULL;
}
- tdb->hash_fn = hash_fn ? hash_fn : default_tdb_hash;
+
+ if (hash_fn) {
+ tdb->hash_fn = hash_fn;
+ hash_alg = "user defined";
+ } else {
+ tdb->hash_fn = tdb_old_hash;
+ hash_alg = "default";
+ }
/* cache the page size */
tdb->page_size = getpagesize();
errno = EINVAL;
goto fail;
}
-
+
if (hash_size == 0)
hash_size = DEFAULT_HASH_SIZE;
if ((open_flags & O_ACCMODE) == O_RDONLY) {
tdb->flags &= ~TDB_CLEAR_IF_FIRST;
}
+ if ((tdb->flags & TDB_ALLOW_NESTING) &&
+ (tdb->flags & TDB_DISALLOW_NESTING)) {
+ tdb->ecode = TDB_ERR_NESTING;
+ TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_open_ex: "
+ "allow_nesting and disallow_nesting are not allowed together!"));
+ errno = EINVAL;
+ goto fail;
+ }
+
+ if (getenv("TDB_NO_FSYNC")) {
+ tdb->flags |= TDB_NOSYNC;
+ }
+
+ /*
+ * TDB_ALLOW_NESTING is the default behavior.
+ * Note: this may change in future versions!
+ */
+ if (!(tdb->flags & TDB_DISALLOW_NESTING)) {
+ tdb->flags |= TDB_ALLOW_NESTING;
+ }
+
/* internal databases don't mmap or lock, and start off cleared */
if (tdb->flags & TDB_INTERNAL) {
tdb->flags |= (TDB_NOLOCK | TDB_NOMMAP);
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: tdb_new_database failed!"));
goto fail;
}
-#ifdef TDB_TRACE
- /* All tracing will fail. That's ok. */
- tdb->tracefd = -1;
-#endif
goto internal;
}
fcntl(tdb->fd, F_SETFD, v | FD_CLOEXEC);
/* ensure there is only one process initialising at once */
- if (tdb->methods->tdb_brlock(tdb, GLOBAL_LOCK, F_WRLCK, F_SETLKW, 0, 1) == -1) {
- TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: failed to get global lock on %s: %s\n",
+ if (tdb_nest_lock(tdb, OPEN_LOCK, F_WRLCK, TDB_LOCK_WAIT) == -1) {
+ TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: failed to get open lock on %s: %s\n",
name, strerror(errno)));
goto fail; /* errno set by tdb_brlock */
}
/* we need to zero database if we are the only one with it open */
if ((tdb_flags & TDB_CLEAR_IF_FIRST) &&
(!tdb->read_only) &&
- (locked = (tdb->methods->tdb_brlock(tdb, ACTIVE_LOCK, F_WRLCK, F_SETLK, 0, 1) == 0))) {
+ (locked = (tdb_nest_lock(tdb, ACTIVE_LOCK, F_WRLCK, TDB_LOCK_NOWAIT|TDB_LOCK_PROBE) == 0))) {
open_flags |= O_CREAT;
if (ftruncate(tdb->fd, 0) == -1) {
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_open_ex: "
goto fail;
}
+ tdb_header_hash(tdb, &magic1_hash, &magic2_hash);
+
+ if ((tdb->header.magic1_hash == 0) && (tdb->header.magic2_hash == 0)) {
+ /* older TDB without magic hash references */
+ } else if ((tdb->header.magic1_hash != magic1_hash) ||
+ (tdb->header.magic2_hash != magic2_hash)) {
+ TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_open_ex: "
+ "%s was not created with the %s hash function we are using\n"
+ "magic1_hash[0x%08X %s 0x%08X] "
+ "magic2_hash[0x%08X %s 0x%08X]\n",
+ name, hash_alg,
+ tdb->header.magic1_hash,
+ (tdb->header.magic1_hash == magic1_hash) ? "==" : "!=",
+ magic1_hash,
+ tdb->header.magic2_hash,
+ (tdb->header.magic2_hash == magic2_hash) ? "==" : "!=",
+ magic2_hash));
+ errno = EINVAL;
+ goto fail;
+ }
+
/* Is it already in the open list? If so, fail. */
if (tdb_already_open(st.st_dev, st.st_ino)) {
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: "
tdb->inode = st.st_ino;
tdb_mmap(tdb);
if (locked) {
- if (tdb->methods->tdb_brlock(tdb, ACTIVE_LOCK, F_UNLCK, F_SETLK, 0, 1) == -1) {
+ if (tdb_nest_unlock(tdb, ACTIVE_LOCK, F_WRLCK, false) == -1) {
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: "
- "failed to take ACTIVE_LOCK on %s: %s\n",
+ "failed to release ACTIVE_LOCK on %s: %s\n",
name, strerror(errno)));
goto fail;
}
if (tdb_flags & TDB_CLEAR_IF_FIRST) {
/* leave this lock in place to indicate it's in use */
- if (tdb->methods->tdb_brlock(tdb, ACTIVE_LOCK, F_RDLCK, F_SETLKW, 0, 1) == -1)
+ if (tdb_nest_lock(tdb, ACTIVE_LOCK, F_RDLCK, TDB_LOCK_WAIT) == -1) {
goto fail;
+ }
}
/* if needed, run recovery */
internal:
/* Internal (memory-only) databases skip all the code above to
* do with disk files, and resume here by releasing their
- * global lock and hooking into the active list. */
- if (tdb->methods->tdb_brlock(tdb, GLOBAL_LOCK, F_UNLCK, F_SETLKW, 0, 1) == -1)
+ * open lock and hooking into the active list. */
+ if (tdb_nest_unlock(tdb, OPEN_LOCK, F_WRLCK, false) == -1) {
goto fail;
+ }
tdb->next = tdbs;
tdbs = tdb;
return tdb;
if (tdb->fd != -1)
if (close(tdb->fd) != 0)
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: failed to close tdb->fd on error!\n"));
+ SAFE_FREE(tdb->lockrecs);
SAFE_FREE(tdb);
errno = save_errno;
return NULL;
struct tdb_context **i;
int ret = 0;
- tdb_trace(tdb, "tdb_close");
if (tdb->transaction) {
- _tdb_transaction_cancel(tdb);
+ tdb_transaction_cancel(tdb);
}
+ tdb_trace(tdb, "tdb_close");
if (tdb->map_ptr) {
if (tdb->flags & TDB_INTERNAL)
tdb_munmap(tdb);
}
SAFE_FREE(tdb->name);
- if (tdb->fd != -1)
+ if (tdb->fd != -1) {
ret = close(tdb->fd);
+ tdb->fd = -1;
+ }
SAFE_FREE(tdb->lockrecs);
/* Remove from contexts list */
return 0; /* Nothing to do. */
}
- if (tdb->num_locks != 0 || tdb->global_lock.count) {
+ if (tdb_have_extra_locks(tdb)) {
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_reopen: reopen not allowed with locks held\n"));
goto fail;
}
tdb_mmap(tdb);
#endif /* fake pread or pwrite */
- if (active_lock &&
- (tdb->methods->tdb_brlock(tdb, ACTIVE_LOCK, F_RDLCK, F_SETLKW, 0, 1) == -1)) {
+ /* We may still think we hold the active lock. */
+ tdb->num_lockrecs = 0;
+ SAFE_FREE(tdb->lockrecs);
+
+ if (active_lock && tdb_nest_lock(tdb, ACTIVE_LOCK, F_RDLCK, TDB_LOCK_WAIT) == -1) {
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: failed to obtain active lock\n"));
goto fail;
}
git.samba.org / metze / ctdb / wip.git / blobdiff