- don't allow any locks to be held when a transaction starts,
otherwise we can end up with deadlock (plus lack of lock nesting
- in posix locks would mean the lock is lost)
+ in POSIX locks would mean the lock is lost)
- if the caller gains a lock during the transaction but doesn't
release it then fail the commit
- allow for nested calls to tdb_transaction_start(), re-using the
- existing transaction record. If the inner transaction is cancelled
+ existing transaction record. If the inner transaction is canceled
then a subsequent commit will fail
- keep a mirrored copy of the tdb hash chain heads to allow for the
- allow callers to mix transaction and non-transaction use of tdb,
although once a transaction is started then an exclusive lock is
- gained until the transaction is committed or cancelled
+ gained until the transaction is committed or canceled
- the commit stategy involves first saving away all modified data
into a linearised buffer in the transaction recovery area, then
/* when inside a transaction we need to keep track of any
nested tdb_transaction_start() calls, as these are allowed,
but don't create a new transaction */
- int nesting;
+ unsigned int nesting;
/* set when a prepare has already occurred */
bool prepared;
tdb_len_t old_map_size;
};
+/* This doesn't really need to be pagesize, but we use it for similar reasons. */
+#define PAGESIZE 4096
/*
read while in a transaction. We need to check first if the data is in our list
of transaction elements, then if not do a real read
*/
-static int transaction_read(struct tdb_context *tdb, tdb_off_t off, void *buf,
- tdb_len_t len)
+static enum TDB_ERROR transaction_read(struct tdb_context *tdb, tdb_off_t off,
+ void *buf, tdb_len_t len)
{
size_t blk;
+ enum TDB_ERROR ecode;
/* break it down into block sized ops */
- while (len + (off % getpagesize()) > getpagesize()) {
- tdb_len_t len2 = getpagesize() - (off % getpagesize());
- if (transaction_read(tdb, off, buf, len2) != 0) {
- return -1;
+ while (len + (off % PAGESIZE) > PAGESIZE) {
+ tdb_len_t len2 = PAGESIZE - (off % PAGESIZE);
+ ecode = transaction_read(tdb, off, buf, len2);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
len -= len2;
off += len2;
}
if (len == 0) {
- return 0;
+ return TDB_SUCCESS;
}
- blk = off / getpagesize();
+ blk = off / PAGESIZE;
/* see if we have it in the block list */
if (tdb->transaction->num_blocks <= blk ||
tdb->transaction->blocks[blk] == NULL) {
/* nope, do a real read */
- if (tdb->transaction->io_methods->read(tdb, off, buf, len) != 0) {
+ ecode = tdb->transaction->io_methods->tread(tdb, off, buf, len);
+ if (ecode != TDB_SUCCESS) {
goto fail;
}
return 0;
/* it is in the block list. Now check for the last block */
if (blk == tdb->transaction->num_blocks-1) {
if (len > tdb->transaction->last_block_size) {
+ ecode = TDB_ERR_IO;
goto fail;
}
}
/* now copy it out of this block */
- memcpy(buf, tdb->transaction->blocks[blk] + (off % getpagesize()), len);
- return 0;
+ memcpy(buf, tdb->transaction->blocks[blk] + (off % PAGESIZE), len);
+ return TDB_SUCCESS;
fail:
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_FATAL,
- "transaction_read: failed at off=%zu len=%zu",
- (size_t)off, (size_t)len);
tdb->transaction->transaction_error = 1;
- return -1;
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "transaction_read: failed at off=%zu len=%zu",
+ (size_t)off, (size_t)len);
}
/*
write while in a transaction
*/
-static int transaction_write(struct tdb_context *tdb, tdb_off_t off,
- const void *buf, tdb_len_t len)
+static enum TDB_ERROR transaction_write(struct tdb_context *tdb, tdb_off_t off,
+ const void *buf, tdb_len_t len)
{
size_t blk;
+ enum TDB_ERROR ecode;
/* Only a commit is allowed on a prepared transaction */
if (tdb->transaction->prepared) {
- tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_DEBUG_FATAL,
- "transaction_write: transaction already prepared,"
- " write not allowed");
+ ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_ERROR,
+ "transaction_write: transaction already"
+ " prepared, write not allowed");
goto fail;
}
/* break it up into block sized chunks */
- while (len + (off % getpagesize()) > getpagesize()) {
- tdb_len_t len2 = getpagesize() - (off % getpagesize());
- if (transaction_write(tdb, off, buf, len2) != 0) {
+ while (len + (off % PAGESIZE) > PAGESIZE) {
+ tdb_len_t len2 = PAGESIZE - (off % PAGESIZE);
+ ecode = transaction_write(tdb, off, buf, len2);
+ if (ecode != TDB_SUCCESS) {
return -1;
}
len -= len2;
}
if (len == 0) {
- return 0;
+ return TDB_SUCCESS;
}
- blk = off / getpagesize();
- off = off % getpagesize();
+ blk = off / PAGESIZE;
+ off = off % PAGESIZE;
if (tdb->transaction->num_blocks <= blk) {
uint8_t **new_blocks;
(blk+1)*sizeof(uint8_t *));
}
if (new_blocks == NULL) {
- tdb_logerr(tdb, TDB_ERR_OOM, TDB_DEBUG_FATAL,
- "transaction_write: failed to allocate");
+ ecode = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
+ "transaction_write:"
+ " failed to allocate");
goto fail;
}
memset(&new_blocks[tdb->transaction->num_blocks], 0,
/* allocate and fill a block? */
if (tdb->transaction->blocks[blk] == NULL) {
- tdb->transaction->blocks[blk] = (uint8_t *)calloc(getpagesize(), 1);
+ tdb->transaction->blocks[blk] = (uint8_t *)calloc(PAGESIZE, 1);
if (tdb->transaction->blocks[blk] == NULL) {
- tdb_logerr(tdb, TDB_ERR_OOM, TDB_DEBUG_FATAL,
- "transaction_write: failed to allocate");
+ ecode = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
+ "transaction_write:"
+ " failed to allocate");
goto fail;
}
- if (tdb->transaction->old_map_size > blk * getpagesize()) {
- tdb_len_t len2 = getpagesize();
- if (len2 + (blk * getpagesize()) > tdb->transaction->old_map_size) {
- len2 = tdb->transaction->old_map_size - (blk * getpagesize());
+ if (tdb->transaction->old_map_size > blk * PAGESIZE) {
+ tdb_len_t len2 = PAGESIZE;
+ if (len2 + (blk * PAGESIZE) > tdb->transaction->old_map_size) {
+ len2 = tdb->transaction->old_map_size - (blk * PAGESIZE);
}
- if (tdb->transaction->io_methods->read(tdb, blk * getpagesize(),
- tdb->transaction->blocks[blk],
- len2) != 0) {
- tdb_logerr(tdb, TDB_ERR_OOM, TDB_DEBUG_FATAL,
- "transaction_write: failed to"
- " read old block: %s",
- strerror(errno));
+ ecode = tdb->transaction->io_methods->tread(tdb,
+ blk * PAGESIZE,
+ tdb->transaction->blocks[blk],
+ len2);
+ if (ecode != TDB_SUCCESS) {
+ ecode = tdb_logerr(tdb, ecode,
+ TDB_LOG_ERROR,
+ "transaction_write:"
+ " failed to"
+ " read old block: %s",
+ strerror(errno));
SAFE_FREE(tdb->transaction->blocks[blk]);
goto fail;
}
}
}
- return 0;
+ return TDB_SUCCESS;
fail:
tdb->transaction->transaction_error = 1;
- return -1;
+ return ecode;
}
/*
- write while in a transaction - this varient never expands the transaction blocks, it only
+ write while in a transaction - this variant never expands the transaction blocks, it only
updates existing blocks. This means it cannot change the recovery size
*/
static void transaction_write_existing(struct tdb_context *tdb, tdb_off_t off,
size_t blk;
/* break it up into block sized chunks */
- while (len + (off % getpagesize()) > getpagesize()) {
- tdb_len_t len2 = getpagesize() - (off % getpagesize());
+ while (len + (off % PAGESIZE) > PAGESIZE) {
+ tdb_len_t len2 = PAGESIZE - (off % PAGESIZE);
transaction_write_existing(tdb, off, buf, len2);
len -= len2;
off += len2;
return;
}
- blk = off / getpagesize();
- off = off % getpagesize();
+ blk = off / PAGESIZE;
+ off = off % PAGESIZE;
if (tdb->transaction->num_blocks <= blk ||
tdb->transaction->blocks[blk] == NULL) {
/*
out of bounds check during a transaction
*/
-static int transaction_oob(struct tdb_context *tdb, tdb_off_t len, bool probe)
+static enum TDB_ERROR transaction_oob(struct tdb_context *tdb, tdb_off_t len,
+ bool probe)
{
- if (len <= tdb->map_size) {
- return 0;
+ if (len <= tdb->file->map_size) {
+ return TDB_SUCCESS;
}
- tdb->ecode = TDB_ERR_IO;
if (!probe) {
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_FATAL,
+ tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_oob len %lld beyond transaction size %lld",
(long long)len,
- (long long)tdb->map_size);
+ (long long)tdb->file->map_size);
}
- return -1;
+ return TDB_ERR_IO;
}
/*
transaction version of tdb_expand().
*/
-static int transaction_expand_file(struct tdb_context *tdb, tdb_off_t addition)
+static enum TDB_ERROR transaction_expand_file(struct tdb_context *tdb,
+ tdb_off_t addition)
{
+ enum TDB_ERROR ecode;
+
/* add a write to the transaction elements, so subsequent
reads see the zero data */
- if (transaction_write(tdb, tdb->map_size, NULL, addition) != 0) {
- return -1;
+ ecode = transaction_write(tdb, tdb->file->map_size, NULL, addition);
+ if (ecode == TDB_SUCCESS) {
+ tdb->file->map_size += addition;
}
- tdb->map_size += addition;
- return 0;
+ return ecode;
}
static void *transaction_direct(struct tdb_context *tdb, tdb_off_t off,
- size_t len)
+ size_t len, bool write_mode)
{
- /* FIXME */
- return NULL;
+ size_t blk = off / PAGESIZE, end_blk;
+
+ /* This is wrong for zero-length blocks, but will fail gracefully */
+ end_blk = (off + len - 1) / PAGESIZE;
+
+ /* Can only do direct if in single block and we've already copied. */
+ if (write_mode) {
+ if (blk != end_blk)
+ return NULL;
+ if (blk >= tdb->transaction->num_blocks)
+ return NULL;
+ if (tdb->transaction->blocks[blk] == NULL)
+ return NULL;
+ return tdb->transaction->blocks[blk] + off % PAGESIZE;
+ }
+
+ /* Single which we have copied? */
+ if (blk == end_blk
+ && blk < tdb->transaction->num_blocks
+ && tdb->transaction->blocks[blk])
+ return tdb->transaction->blocks[blk] + off % PAGESIZE;
+
+ /* Otherwise must be all not copied. */
+ while (blk <= end_blk) {
+ if (blk >= tdb->transaction->num_blocks)
+ break;
+ if (tdb->transaction->blocks[blk])
+ return NULL;
+ blk++;
+ }
+ return tdb->transaction->io_methods->direct(tdb, off, len, false);
}
static const struct tdb_methods transaction_methods = {
/*
sync to disk
*/
-static int transaction_sync(struct tdb_context *tdb, tdb_off_t offset, tdb_len_t length)
+static enum TDB_ERROR transaction_sync(struct tdb_context *tdb,
+ tdb_off_t offset, tdb_len_t length)
{
if (tdb->flags & TDB_NOSYNC) {
- return 0;
+ return TDB_SUCCESS;
}
- if (fsync(tdb->fd) != 0) {
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_FATAL,
- "tdb_transaction: fsync failed: %s",
- strerror(errno));
- return -1;
+ if (fsync(tdb->file->fd) != 0) {
+ return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
+ "tdb_transaction: fsync failed: %s",
+ strerror(errno));
}
#ifdef MS_SYNC
- if (tdb->map_ptr) {
- tdb_off_t moffset = offset & ~(getpagesize()-1);
- if (msync(moffset + (char *)tdb->map_ptr,
+ if (tdb->file->map_ptr) {
+ tdb_off_t moffset = offset & ~(PAGESIZE-1);
+ if (msync(moffset + (char *)tdb->file->map_ptr,
length + (offset - moffset), MS_SYNC) != 0) {
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_FATAL,
- "tdb_transaction: msync failed: %s",
- strerror(errno));
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
+ "tdb_transaction: msync failed: %s",
+ strerror(errno));
}
}
#endif
- return 0;
+ return TDB_SUCCESS;
}
static void _tdb_transaction_cancel(struct tdb_context *tdb)
{
int i;
+ enum TDB_ERROR ecode;
if (tdb->transaction == NULL) {
- tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_DEBUG_ERROR,
+ tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
"tdb_transaction_cancel: no transaction");
return;
}
return;
}
- tdb->map_size = tdb->transaction->old_map_size;
+ tdb->file->map_size = tdb->transaction->old_map_size;
/* free all the transaction blocks */
for (i=0;i<tdb->transaction->num_blocks;i++) {
uint64_t invalid = TDB_RECOVERY_INVALID_MAGIC;
/* remove the recovery marker */
- if (methods->write(tdb, tdb->transaction->magic_offset,
- &invalid, sizeof(invalid)) == -1 ||
- transaction_sync(tdb, tdb->transaction->magic_offset,
- sizeof(invalid)) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
+ ecode = methods->twrite(tdb, tdb->transaction->magic_offset,
+ &invalid, sizeof(invalid));
+ if (ecode == TDB_SUCCESS)
+ ecode = transaction_sync(tdb,
+ tdb->transaction->magic_offset,
+ sizeof(invalid));
+ if (ecode != TDB_SUCCESS) {
+ tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
"tdb_transaction_cancel: failed to remove"
" recovery magic");
}
}
- if (tdb->allrecord_lock.count)
- tdb_allrecord_unlock(tdb, tdb->allrecord_lock.ltype);
+ if (tdb->file->allrecord_lock.count)
+ tdb_allrecord_unlock(tdb, tdb->file->allrecord_lock.ltype);
/* restore the normal io methods */
tdb->methods = tdb->transaction->io_methods;
start a tdb transaction. No token is returned, as only a single
transaction is allowed to be pending per tdb_context
*/
-int tdb_transaction_start(struct tdb_context *tdb)
+enum TDB_ERROR tdb_transaction_start(struct tdb_context *tdb)
{
+ enum TDB_ERROR ecode;
+
/* some sanity checks */
if (tdb->read_only || (tdb->flags & TDB_INTERNAL)) {
- tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_DEBUG_ERROR,
- "tdb_transaction_start: cannot start a transaction"
- " on a read-only or internal db");
- return -1;
+ return tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_transaction_start:"
+ " cannot start a"
+ " transaction on a "
+ "read-only or internal db");
}
/* cope with nested tdb_transaction_start() calls */
if (tdb->transaction != NULL) {
- tdb_logerr(tdb, TDB_ERR_NESTING, TDB_DEBUG_ERROR,
- "tdb_transaction_start:"
- " already inside transaction");
- return -1;
+ if (!(tdb->flags & TDB_ALLOW_NESTING)) {
+ return tdb->last_error
+ = tdb_logerr(tdb, TDB_ERR_IO,
+ TDB_LOG_USE_ERROR,
+ "tdb_transaction_start:"
+ " already inside transaction");
+ }
+ tdb->transaction->nesting++;
+ return 0;
}
if (tdb_has_hash_locks(tdb)) {
/* the caller must not have any locks when starting a
transaction as otherwise we'll be screwed by lack
- of nested locks in posix */
- tdb_logerr(tdb, TDB_ERR_LOCK, TDB_DEBUG_ERROR,
- "tdb_transaction_start: cannot start a transaction"
- " with locks held");
- return -1;
+ of nested locks in POSIX */
+ return tdb->last_error = tdb_logerr(tdb, TDB_ERR_LOCK,
+ TDB_LOG_USE_ERROR,
+ "tdb_transaction_start:"
+ " cannot start a"
+ " transaction with locks"
+ " held");
}
tdb->transaction = (struct tdb_transaction *)
calloc(sizeof(struct tdb_transaction), 1);
if (tdb->transaction == NULL) {
- tdb_logerr(tdb, TDB_ERR_OOM, TDB_DEBUG_ERROR,
- "tdb_transaction_start: cannot allocate");
- return -1;
+ return tdb->last_error = tdb_logerr(tdb, TDB_ERR_OOM,
+ TDB_LOG_ERROR,
+ "tdb_transaction_start:"
+ " cannot allocate");
}
/* get the transaction write lock. This is a blocking lock. As
discussed with Volker, there are a number of ways we could
make this async, which we will probably do in the future */
- if (tdb_transaction_lock(tdb, F_WRLCK) == -1) {
+ ecode = tdb_transaction_lock(tdb, F_WRLCK);
+ if (ecode != TDB_SUCCESS) {
SAFE_FREE(tdb->transaction->blocks);
SAFE_FREE(tdb->transaction);
- return -1;
+ return tdb->last_error = ecode;
}
/* get a read lock over entire file. This is upgraded to a write
lock during the commit */
- if (tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_WAIT, true) == -1) {
+ ecode = tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_WAIT, true);
+ if (ecode != TDB_SUCCESS) {
goto fail_allrecord_lock;
}
/* make sure we know about any file expansions already done by
anyone else */
- tdb->methods->oob(tdb, tdb->map_size + 1, true);
- tdb->transaction->old_map_size = tdb->map_size;
+ tdb->methods->oob(tdb, tdb->file->map_size + 1, true);
+ tdb->transaction->old_map_size = tdb->file->map_size;
/* finally hook the io methods, replacing them with
transaction specific methods */
tdb->transaction->io_methods = tdb->methods;
tdb->methods = &transaction_methods;
- return 0;
+ return tdb->last_error = TDB_SUCCESS;
fail_allrecord_lock:
tdb_transaction_unlock(tdb, F_WRLCK);
SAFE_FREE(tdb->transaction->blocks);
SAFE_FREE(tdb->transaction);
- return -1;
+ return tdb->last_error = ecode;
}
recovery_size = sizeof(tdb_len_t);
for (i=0;i<tdb->transaction->num_blocks;i++) {
- if (i * getpagesize() >= tdb->transaction->old_map_size) {
+ if (i * PAGESIZE >= tdb->transaction->old_map_size) {
break;
}
if (tdb->transaction->blocks[i] == NULL) {
if (i == tdb->transaction->num_blocks-1) {
recovery_size += tdb->transaction->last_block_size;
} else {
- recovery_size += getpagesize();
+ recovery_size += PAGESIZE;
}
}
allocate the recovery area, or use an existing recovery area if it is
large enough
*/
-static int tdb_recovery_allocate(struct tdb_context *tdb,
- tdb_len_t *recovery_size,
- tdb_off_t *recovery_offset,
- tdb_len_t *recovery_max_size)
+static enum TDB_ERROR tdb_recovery_allocate(struct tdb_context *tdb,
+ tdb_len_t *recovery_size,
+ tdb_off_t *recovery_offset,
+ tdb_len_t *recovery_max_size)
{
struct tdb_recovery_record rec;
const struct tdb_methods *methods = tdb->transaction->io_methods;
tdb_off_t recovery_head;
size_t addition;
+ enum TDB_ERROR ecode;
recovery_head = tdb_read_off(tdb, offsetof(struct tdb_header,recovery));
- if (recovery_head == TDB_OFF_ERR) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_recovery_allocate:"
- " failed to read recovery head");
- return -1;
+ if (TDB_OFF_IS_ERR(recovery_head)) {
+ return tdb_logerr(tdb, recovery_head, TDB_LOG_ERROR,
+ "tdb_recovery_allocate:"
+ " failed to read recovery head");
}
if (recovery_head != 0) {
- if (methods->read(tdb, recovery_head, &rec, sizeof(rec))) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_recovery_allocate:"
- " failed to read recovery record");
- return -1;
+ ecode = methods->tread(tdb, recovery_head, &rec, sizeof(rec));
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_recovery_allocate:"
+ " failed to read recovery record");
}
tdb_convert(tdb, &rec, sizeof(rec));
/* ignore invalid recovery regions: can happen in crash */
/* it fits in the existing area */
*recovery_max_size = rec.max_len;
*recovery_offset = recovery_head;
- return 0;
+ return TDB_SUCCESS;
}
/* we need to free up the old recovery area, then allocate a
us an area that is being currently used (as of the start of
the transaction) */
if (recovery_head != 0) {
- add_stat(tdb, frees, 1);
- if (add_free_record(tdb, recovery_head,
- sizeof(rec) + rec.max_len) != 0) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_recovery_allocate:"
- " failed to free previous recovery area");
- return -1;
+ tdb->stats.frees++;
+ ecode = add_free_record(tdb, recovery_head,
+ sizeof(rec) + rec.max_len,
+ TDB_LOCK_WAIT);
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_recovery_allocate:"
+ " failed to free previous"
+ " recovery area");
}
}
/* the tdb_free() call might have increased the recovery size */
*recovery_size = tdb_recovery_size(tdb);
- /* round up to a multiple of page size */
+ /* round up to a multiple of page size. Overallocate, since each
+ * such allocation forces us to expand the file. */
*recovery_max_size
- = (((sizeof(rec) + *recovery_size) + getpagesize()-1)
- & ~(getpagesize()-1))
+ = (((sizeof(rec) + *recovery_size + *recovery_size / 2)
+ + PAGESIZE-1) & ~(PAGESIZE-1))
- sizeof(rec);
- *recovery_offset = tdb->map_size;
+ *recovery_offset = tdb->file->map_size;
recovery_head = *recovery_offset;
/* Restore ->map_size before calling underlying expand_file.
Also so that we don't try to expand the file again in the
transaction commit, which would destroy the recovery
area */
- addition = (tdb->map_size - tdb->transaction->old_map_size) +
+ addition = (tdb->file->map_size - tdb->transaction->old_map_size) +
sizeof(rec) + *recovery_max_size;
- tdb->map_size = tdb->transaction->old_map_size;
- if (methods->expand_file(tdb, addition) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_recovery_allocate:"
- " failed to create recovery area");
- return -1;
+ tdb->file->map_size = tdb->transaction->old_map_size;
+ ecode = methods->expand_file(tdb, addition);
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_recovery_allocate:"
+ " failed to create recovery area");
}
/* we have to reset the old map size so that we don't try to
expand the file again in the transaction commit, which
would destroy the recovery area */
- tdb->transaction->old_map_size = tdb->map_size;
+ tdb->transaction->old_map_size = tdb->file->map_size;
/* write the recovery header offset and sync - we can sync without a race here
as the magic ptr in the recovery record has not been set */
tdb_convert(tdb, &recovery_head, sizeof(recovery_head));
- if (methods->write(tdb, offsetof(struct tdb_header, recovery),
- &recovery_head, sizeof(tdb_off_t)) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_recovery_allocate:"
- " failed to write recovery head");
- return -1;
+ ecode = methods->twrite(tdb, offsetof(struct tdb_header, recovery),
+ &recovery_head, sizeof(tdb_off_t));
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_recovery_allocate:"
+ " failed to write recovery head");
}
transaction_write_existing(tdb, offsetof(struct tdb_header, recovery),
&recovery_head,
sizeof(tdb_off_t));
- return 0;
+ return TDB_SUCCESS;
}
/* Set up header for the recovery record. */
/*
setup the recovery data that will be used on a crash during commit
*/
-static int transaction_setup_recovery(struct tdb_context *tdb,
- tdb_off_t *magic_offset)
+static enum TDB_ERROR transaction_setup_recovery(struct tdb_context *tdb,
+ tdb_off_t *magic_offset)
{
- tdb_len_t recovery_size;
+ /* Initialized for GCC's 4.4.5 overzealous uninitialized warnings. */
+ tdb_len_t recovery_size = 0;
+ tdb_off_t recovery_offset = 0, recovery_max_size = 0;
unsigned char *data, *p;
const struct tdb_methods *methods = tdb->transaction->io_methods;
struct tdb_recovery_record *rec;
- tdb_off_t recovery_offset, recovery_max_size;
tdb_off_t old_map_size = tdb->transaction->old_map_size;
uint64_t magic, tailer;
int i;
+ enum TDB_ERROR ecode;
/*
check that the recovery area has enough space
*/
- if (tdb_recovery_allocate(tdb, &recovery_size,
- &recovery_offset, &recovery_max_size) == -1) {
- return -1;
+ ecode = tdb_recovery_allocate(tdb, &recovery_size,
+ &recovery_offset, &recovery_max_size);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
data = (unsigned char *)malloc(recovery_size + sizeof(*rec));
if (data == NULL) {
- tdb_logerr(tdb, TDB_ERR_OOM, TDB_DEBUG_FATAL,
- "transaction_setup_recovery: cannot allocate");
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
+ "transaction_setup_recovery:"
+ " cannot allocate");
}
rec = (struct tdb_recovery_record *)data;
continue;
}
- offset = i * getpagesize();
- length = getpagesize();
+ offset = i * PAGESIZE;
+ length = PAGESIZE;
if (i == tdb->transaction->num_blocks-1) {
length = tdb->transaction->last_block_size;
}
if (offset >= old_map_size) {
continue;
}
- if (offset + length > tdb->map_size) {
- tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_DEBUG_FATAL,
- "tdb_transaction_setup_recovery:"
- " transaction data over new region boundary");
+ if (offset + length > tdb->file->map_size) {
free(data);
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_transaction_setup_recovery:"
+ " transaction data over new region"
+ " boundary");
}
memcpy(p, &offset, sizeof(offset));
memcpy(p + sizeof(offset), &length, sizeof(length));
/* the recovery area contains the old data, not the
new data, so we have to call the original tdb_read
method to get it */
- if (methods->read(tdb, offset,
- p + sizeof(offset) + sizeof(length),
- length) != 0) {
+ ecode = methods->tread(tdb, offset,
+ p + sizeof(offset) + sizeof(length),
+ length);
+ if (ecode != TDB_SUCCESS) {
free(data);
- return -1;
+ return ecode;
}
p += sizeof(offset) + sizeof(length) + length;
}
tdb_convert(tdb, p, sizeof(tailer));
/* write the recovery data to the recovery area */
- if (methods->write(tdb, recovery_offset, data,
- sizeof(*rec) + recovery_size) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_setup_recovery:"
- " failed to write recovery data");
+ ecode = methods->twrite(tdb, recovery_offset, data,
+ sizeof(*rec) + recovery_size);
+ if (ecode != TDB_SUCCESS) {
free(data);
- return -1;
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_transaction_setup_recovery:"
+ " failed to write recovery data");
}
transaction_write_existing(tdb, recovery_offset, data,
sizeof(*rec) + recovery_size);
/* as we don't have ordered writes, we have to sync the recovery
data before we update the magic to indicate that the recovery
data is present */
- if (transaction_sync(tdb, recovery_offset,
- sizeof(*rec) + recovery_size) == -1) {
+ ecode = transaction_sync(tdb, recovery_offset,
+ sizeof(*rec) + recovery_size);
+ if (ecode != TDB_SUCCESS) {
free(data);
- return -1;
+ return ecode;
}
free(data);
*magic_offset = recovery_offset + offsetof(struct tdb_recovery_record,
magic);
- if (methods->write(tdb, *magic_offset, &magic, sizeof(magic)) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_setup_recovery:"
- " failed to write recovery magic");
- return -1;
+ ecode = methods->twrite(tdb, *magic_offset, &magic, sizeof(magic));
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_transaction_setup_recovery:"
+ " failed to write recovery magic");
}
transaction_write_existing(tdb, *magic_offset, &magic, sizeof(magic));
/* ensure the recovery magic marker is on disk */
- if (transaction_sync(tdb, *magic_offset, sizeof(magic)) == -1) {
- return -1;
- }
-
- return 0;
+ return transaction_sync(tdb, *magic_offset, sizeof(magic));
}
-static int _tdb_transaction_prepare_commit(struct tdb_context *tdb)
+static enum TDB_ERROR _tdb_transaction_prepare_commit(struct tdb_context *tdb)
{
const struct tdb_methods *methods;
+ enum TDB_ERROR ecode;
if (tdb->transaction == NULL) {
- tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_DEBUG_ERROR,
- "tdb_transaction_prepare_commit: no transaction");
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
+ "tdb_transaction_prepare_commit:"
+ " no transaction");
}
if (tdb->transaction->prepared) {
_tdb_transaction_cancel(tdb);
- tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_DEBUG_ERROR,
- "tdb_transaction_prepare_commit:"
- " transaction already prepared");
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
+ "tdb_transaction_prepare_commit:"
+ " transaction already prepared");
}
if (tdb->transaction->transaction_error) {
_tdb_transaction_cancel(tdb);
- tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_DEBUG_ERROR,
- "tdb_transaction_prepare_commit:"
- " transaction error pending");
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_ERROR,
+ "tdb_transaction_prepare_commit:"
+ " transaction error pending");
}
if (tdb->transaction->nesting != 0) {
- tdb->transaction->nesting--;
- return 0;
+ return TDB_SUCCESS;
}
/* check for a null transaction */
if (tdb->transaction->blocks == NULL) {
- return 0;
+ return TDB_SUCCESS;
}
methods = tdb->transaction->io_methods;
/* upgrade the main transaction lock region to a write lock */
- if (tdb_allrecord_upgrade(tdb) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_ERROR,
- "tdb_transaction_prepare_commit:"
- " failed to upgrade hash locks");
- _tdb_transaction_cancel(tdb);
- return -1;
+ ecode = tdb_allrecord_upgrade(tdb);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
/* get the open lock - this prevents new users attaching to the database
during the commit */
- if (tdb_lock_open(tdb, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_ERROR,
- "tdb_transaction_prepare_commit:"
- " failed to get open lock");
- _tdb_transaction_cancel(tdb);
- return -1;
+ ecode = tdb_lock_open(tdb, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
/* Since we have whole db locked, we don't need the expansion lock. */
if (!(tdb->flags & TDB_NOSYNC)) {
/* write the recovery data to the end of the file */
- if (transaction_setup_recovery(tdb, &tdb->transaction->magic_offset) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_prepare_commit:"
- " failed to setup recovery data");
- _tdb_transaction_cancel(tdb);
- return -1;
+ ecode = transaction_setup_recovery(tdb,
+ &tdb->transaction
+ ->magic_offset);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
}
tdb->transaction->prepared = true;
/* expand the file to the new size if needed */
- if (tdb->map_size != tdb->transaction->old_map_size) {
- tdb_len_t add = tdb->map_size - tdb->transaction->old_map_size;
+ if (tdb->file->map_size != tdb->transaction->old_map_size) {
+ tdb_len_t add;
+
+ add = tdb->file->map_size - tdb->transaction->old_map_size;
/* Restore original map size for tdb_expand_file */
- tdb->map_size = tdb->transaction->old_map_size;
- if (methods->expand_file(tdb, add) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_ERROR,
- "tdb_transaction_prepare_commit:"
- " expansion failed");
- _tdb_transaction_cancel(tdb);
- return -1;
+ tdb->file->map_size = tdb->transaction->old_map_size;
+ ecode = methods->expand_file(tdb, add);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
}
/* Keep the open lock until the actual commit */
-
- return 0;
+ return TDB_SUCCESS;
}
/*
prepare to commit the current transaction
*/
-int tdb_transaction_prepare_commit(struct tdb_context *tdb)
+enum TDB_ERROR tdb_transaction_prepare_commit(struct tdb_context *tdb)
{
return _tdb_transaction_prepare_commit(tdb);
}
/*
commit the current transaction
*/
-int tdb_transaction_commit(struct tdb_context *tdb)
+enum TDB_ERROR tdb_transaction_commit(struct tdb_context *tdb)
{
const struct tdb_methods *methods;
int i;
+ enum TDB_ERROR ecode;
if (tdb->transaction == NULL) {
- tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_DEBUG_ERROR,
- "tdb_transaction_commit: no transaction");
- return -1;
+ return tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_transaction_commit:"
+ " no transaction");
}
tdb_trace(tdb, "tdb_transaction_commit");
- if (tdb->transaction->transaction_error) {
- tdb_transaction_cancel(tdb);
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_ERROR,
- "tdb_transaction_commit:"
- " transaction error pending");
- return -1;
- }
-
-
if (tdb->transaction->nesting != 0) {
tdb->transaction->nesting--;
- return 0;
+ return tdb->last_error = TDB_SUCCESS;
}
/* check for a null transaction */
if (tdb->transaction->blocks == NULL) {
_tdb_transaction_cancel(tdb);
- return 0;
+ return tdb->last_error = TDB_SUCCESS;
}
if (!tdb->transaction->prepared) {
- int ret = _tdb_transaction_prepare_commit(tdb);
- if (ret)
- return ret;
+ ecode = _tdb_transaction_prepare_commit(tdb);
+ if (ecode != TDB_SUCCESS) {
+ _tdb_transaction_cancel(tdb);
+ return tdb->last_error = ecode;
+ }
}
methods = tdb->transaction->io_methods;
continue;
}
- offset = i * getpagesize();
- length = getpagesize();
+ offset = i * PAGESIZE;
+ length = PAGESIZE;
if (i == tdb->transaction->num_blocks-1) {
length = tdb->transaction->last_block_size;
}
- if (methods->write(tdb, offset, tdb->transaction->blocks[i],
- length) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_commit:"
- " write failed during commit");
-
+ ecode = methods->twrite(tdb, offset,
+ tdb->transaction->blocks[i], length);
+ if (ecode != TDB_SUCCESS) {
/* we've overwritten part of the data and
possibly expanded the file, so we need to
run the crash recovery code */
_tdb_transaction_cancel(tdb);
- return -1;
+ return tdb->last_error = ecode;
}
SAFE_FREE(tdb->transaction->blocks[i]);
}
tdb->transaction->num_blocks = 0;
/* ensure the new data is on disk */
- if (transaction_sync(tdb, 0, tdb->map_size) == -1) {
- return -1;
+ ecode = transaction_sync(tdb, 0, tdb->file->map_size);
+ if (ecode != TDB_SUCCESS) {
+ return tdb->last_error = ecode;
}
/*
#endif
/* use a transaction cancel to free memory and remove the
- transaction locks */
+ transaction locks: it "restores" map_size, too. */
+ tdb->transaction->old_map_size = tdb->file->map_size;
_tdb_transaction_cancel(tdb);
- return 0;
+ return tdb->last_error = TDB_SUCCESS;
}
database write access already established (including the open
lock to prevent new processes attaching)
*/
-int tdb_transaction_recover(struct tdb_context *tdb)
+enum TDB_ERROR tdb_transaction_recover(struct tdb_context *tdb)
{
tdb_off_t recovery_head, recovery_eof;
unsigned char *data, *p;
struct tdb_recovery_record rec;
+ enum TDB_ERROR ecode;
/* find the recovery area */
recovery_head = tdb_read_off(tdb, offsetof(struct tdb_header,recovery));
- if (recovery_head == TDB_OFF_ERR) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_recover:"
- " failed to read recovery head");
- return -1;
+ if (TDB_OFF_IS_ERR(recovery_head)) {
+ return tdb_logerr(tdb, recovery_head, TDB_LOG_ERROR,
+ "tdb_transaction_recover:"
+ " failed to read recovery head");
}
if (recovery_head == 0) {
/* we have never allocated a recovery record */
- return 0;
+ return TDB_SUCCESS;
}
/* read the recovery record */
- if (tdb_read_convert(tdb, recovery_head, &rec, sizeof(rec)) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_recover:"
- " failed to read recovery record");
- return -1;
+ ecode = tdb_read_convert(tdb, recovery_head, &rec, sizeof(rec));
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_transaction_recover:"
+ " failed to read recovery record");
}
if (rec.magic != TDB_RECOVERY_MAGIC) {
/* there is no valid recovery data */
- return 0;
+ return TDB_SUCCESS;
}
if (tdb->read_only) {
- tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_DEBUG_FATAL,
- "tdb_transaction_recover:"
- " attempt to recover read only database");
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_transaction_recover:"
+ " attempt to recover read only database");
}
recovery_eof = rec.eof;
data = (unsigned char *)malloc(rec.len);
if (data == NULL) {
- tdb_logerr(tdb, TDB_ERR_OOM, TDB_DEBUG_FATAL,
- "tdb_transaction_recover:"
- " failed to allocate recovery data");
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
+ "tdb_transaction_recover:"
+ " failed to allocate recovery data");
}
/* read the full recovery data */
- if (tdb->methods->read(tdb, recovery_head + sizeof(rec), data,
- rec.len) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_recover:"
- " failed to read recovery data");
- return -1;
+ ecode = tdb->methods->tread(tdb, recovery_head + sizeof(rec), data,
+ rec.len);
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_transaction_recover:"
+ " failed to read recovery data");
}
/* recover the file data */
memcpy(&len, p + sizeof(ofs), sizeof(len));
p += sizeof(ofs) + sizeof(len);
- if (tdb->methods->write(tdb, ofs, p, len) == -1) {
+ ecode = tdb->methods->twrite(tdb, ofs, p, len);
+ if (ecode != TDB_SUCCESS) {
free(data);
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_recover:"
- " failed to recover %zu bytes at offset %zu",
- (size_t)len, (size_t)ofs);
- return -1;
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_transaction_recover:"
+ " failed to recover %zu bytes"
+ " at offset %zu",
+ (size_t)len, (size_t)ofs);
}
p += len;
}
free(data);
- if (transaction_sync(tdb, 0, tdb->map_size) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_recover: failed to sync recovery");
- return -1;
+ ecode = transaction_sync(tdb, 0, tdb->file->map_size);
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_transaction_recover:"
+ " failed to sync recovery");
}
/* if the recovery area is after the recovered eof then remove it */
if (recovery_eof <= recovery_head) {
- if (tdb_write_off(tdb, offsetof(struct tdb_header,recovery), 0)
- == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_recover:"
- " failed to remove recovery head");
- return -1;
+ ecode = tdb_write_off(tdb, offsetof(struct tdb_header,
+ recovery),
+ 0);
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_transaction_recover:"
+ " failed to remove recovery head");
}
}
/* remove the recovery magic */
- if (tdb_write_off(tdb,
- recovery_head
- + offsetof(struct tdb_recovery_record, magic),
- TDB_RECOVERY_INVALID_MAGIC) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_recover:"
- " failed to remove recovery magic");
- return -1;
+ ecode = tdb_write_off(tdb,
+ recovery_head
+ + offsetof(struct tdb_recovery_record, magic),
+ TDB_RECOVERY_INVALID_MAGIC);
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_transaction_recover:"
+ " failed to remove recovery magic");
}
- if (transaction_sync(tdb, 0, recovery_eof) == -1) {
- tdb_logerr(tdb, tdb->ecode, TDB_DEBUG_FATAL,
- "tdb_transaction_recover: failed to sync2 recovery");
- return -1;
+ ecode = transaction_sync(tdb, 0, recovery_eof);
+ if (ecode != TDB_SUCCESS) {
+ return tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_transaction_recover:"
+ " failed to sync2 recovery");
}
- tdb_logerr(tdb, TDB_SUCCESS, TDB_DEBUG_TRACE,
+ tdb_logerr(tdb, TDB_SUCCESS, TDB_LOG_WARNING,
"tdb_transaction_recover: recovered %zu byte database",
(size_t)recovery_eof);
/* all done */
- return 0;
+ return TDB_SUCCESS;
}
-/* Any I/O failures we say "needs recovery". */
-bool tdb_needs_recovery(struct tdb_context *tdb)
+tdb_bool_err tdb_needs_recovery(struct tdb_context *tdb)
{
tdb_off_t recovery_head;
struct tdb_recovery_record rec;
+ enum TDB_ERROR ecode;
/* find the recovery area */
recovery_head = tdb_read_off(tdb, offsetof(struct tdb_header,recovery));
- if (recovery_head == TDB_OFF_ERR) {
- return true;
+ if (TDB_OFF_IS_ERR(recovery_head)) {
+ return recovery_head;
}
if (recovery_head == 0) {
}
/* read the recovery record */
- if (tdb_read_convert(tdb, recovery_head, &rec, sizeof(rec)) == -1) {
- return true;
+ ecode = tdb_read_convert(tdb, recovery_head, &rec, sizeof(rec));
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
return (rec.magic == TDB_RECOVERY_MAGIC);
projects / ccan / blobdiff