License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
-#include "config.h"
-#include <stdint.h>
-#include <stdbool.h>
+#include <ccan/tdb2/tdb2.h>
#include <stdlib.h>
#include <stddef.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
-#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <utime.h>
#include <unistd.h>
-#include <ccan/tdb2/tdb2.h>
#include <ccan/likely/likely.h>
-#include <ccan/compiler/compiler.h>
-#if HAVE_BYTESWAP_H
-#include <byteswap.h>
-#endif
+#include <ccan/endian/endian.h>
#ifndef TEST_IT
#define TEST_IT(cond)
/* Packing errors into pointers and v.v. */
#define TDB_PTR_IS_ERR(ptr) \
- unlikely((void *)(ptr) >= (void *)(long)TDB_ERR_LAST)
+ unlikely((unsigned long)(ptr) >= (unsigned long)TDB_ERR_LAST)
#define TDB_PTR_ERR(p) ((enum TDB_ERROR)(long)(p))
#define TDB_ERR_PTR(err) ((void *)(long)(err))
/* Prevent others from opening the file. */
#define TDB_OPEN_LOCK 0
-/* Doing a transaction. */
-#define TDB_TRANSACTION_LOCK 1
/* Expanding file. */
#define TDB_EXPANSION_LOCK 2
+/* Doing a transaction. */
+#define TDB_TRANSACTION_LOCK 8
/* Hash chain locks. */
-#define TDB_HASH_LOCK_START 3
+#define TDB_HASH_LOCK_START 64
/* Range for hash locks. */
#define TDB_HASH_LOCK_RANGE_BITS 30
#define TDB_OFF_HASH_EXTRA_BIT 57
#define TDB_OFF_UPPER_STEAL_SUBHASH_BIT 56
+/* Additional features we understand. Currently: none. */
+#define TDB_FEATURE_MASK ((uint64_t)0)
+
/* The bit number where we store the extra hash bits. */
/* Convenience mask to get actual offset. */
#define TDB_OFF_MASK \
/* Indicates this entry is not on an flist (can happen during coalescing) */
#define TDB_FTABLE_NONE ((1ULL << TDB_OFF_UPPER_STEAL) - 1)
-#if !HAVE_BSWAP_64
-static inline uint64_t bswap_64(uint64_t x)
-{
- return (((x&0x000000FFULL)<<56)
- | ((x&0x0000FF00ULL)<<48)
- | ((x&0x00FF0000ULL)<<40)
- | ((x&0xFF000000ULL)<<32)
- | ((x>>8)&0xFF000000ULL)
- | ((x>>16)&0x00FF0000ULL)
- | ((x>>24)&0x0000FF00ULL)
- | ((x>>32)&0x000000FFULL));
-}
-#endif
-
struct tdb_used_record {
/* For on-disk compatibility, we avoid bitfields:
magic: 16, (highest)
struct tdb_recovery_record {
uint64_t magic;
- /* Length of record. */
+ /* Length of record (add this header to get total length). */
uint64_t max_len;
/* Length used. */
uint64_t len;
tdb_off_t free_table; /* (First) free table. */
tdb_off_t recovery; /* Transaction recovery area. */
- tdb_off_t reserved[26];
+ uint64_t features_used; /* Features all writers understand */
+ uint64_t features_offered; /* Features offered */
+
+ uint64_t seqnum; /* Sequence number for TDB_SEQNUM */
+
+ tdb_off_t reserved[23];
/* Top level hash table. */
tdb_off_t hashtable[1ULL << TDB_TOPLEVEL_HASH_BITS];
TDB_LOCK_NOCHECK = 4,
};
-struct tdb_lock_type {
- uint32_t off;
+struct tdb_lock {
+ struct tdb_context *owner;
+ off_t off;
uint32_t count;
uint32_t ltype;
};
bool convert;
};
-struct tdb_context {
- /* Filename of the database. */
- const char *name;
+struct tdb_file {
+ /* How many are sharing us? */
+ unsigned int refcnt;
/* Mmap (if any), or malloc (for TDB_INTERNAL). */
void *map_ptr;
- /* Are we accessing directly? (debugging check). */
- int direct_access;
+ /* How much space has been mapped (<= current file size) */
+ tdb_len_t map_size;
- /* Open file descriptor (undefined for TDB_INTERNAL). */
+ /* The file descriptor (-1 for TDB_INTERNAL). */
int fd;
- /* How much space has been mapped (<= current file size) */
- tdb_len_t map_size;
+ /* Lock information */
+ pid_t locker;
+ struct tdb_lock allrecord_lock;
+ size_t num_lockrecs;
+ struct tdb_lock *lockrecs;
- /* Operating read-only? (Opened O_RDONLY, or in traverse_read) */
- bool read_only;
+ /* Identity of this file. */
+ dev_t device;
+ ino_t inode;
+};
- /* mmap read only? */
- int mmap_flags;
+struct tdb_context {
+ /* Single list of all TDBs, to detect multiple opens. */
+ struct tdb_context *next;
- /* Error code for last tdb error. */
- enum TDB_ERROR ecode;
+ /* Filename of the database. */
+ const char *name;
- /* the flags passed to tdb_open, for tdb_reopen. */
+ /* Logging function */
+ void (*log_fn)(struct tdb_context *tdb,
+ enum tdb_log_level level,
+ enum TDB_ERROR ecode,
+ const char *message,
+ void *data);
+ void *log_data;
+
+ /* Open flags passed to tdb_open. */
+ int open_flags;
+
+ /* low level (fnctl) lock functions. */
+ int (*lock_fn)(int fd, int rw, off_t off, off_t len, bool w, void *);
+ int (*unlock_fn)(int fd, int rw, off_t off, off_t len, void *);
+ void *lock_data;
+
+ /* the flags passed to tdb_open. */
uint32_t flags;
- /* Logging function */
- void (*logfn)(struct tdb_context *tdb,
- enum tdb_log_level level,
- void *log_private,
- const char *message);
- void *log_private;
+ /* Our statistics. */
+ struct tdb_attribute_stats stats;
+
+ /* Are we accessing directly? (debugging check). */
+ int direct_access;
/* Hash function. */
- uint64_t (*khash)(const void *key, size_t len, uint64_t seed, void *);
- void *hash_priv;
+ uint64_t (*hash_fn)(const void *key, size_t len, uint64_t seed, void *);
+ void *hash_data;
uint64_t hash_seed;
/* Set if we are in a transaction. */
tdb_off_t ftable_off;
unsigned int ftable;
+ /* Our open hook, if any. */
+ enum TDB_ERROR (*openhook)(int fd, void *data);
+ void *openhook_data;
+
/* IO methods: changes for transactions. */
const struct tdb_methods *methods;
- /* Lock information */
- struct tdb_lock_type allrecord_lock;
- size_t num_lockrecs;
- struct tdb_lock_type *lockrecs;
-
- struct tdb_attribute_stats *stats;
-
/* Direct access information */
struct tdb_access_hdr *access;
- /* Single list of all TDBs, to avoid multiple opens. */
- struct tdb_context *next;
- dev_t device;
- ino_t inode;
+ /* Last error we returned. */
+ enum TDB_ERROR last_error;
+
+ /* The actual file information */
+ struct tdb_file *file;
};
struct tdb_methods {
internal prototypes
*/
/* hash.c: */
-void tdb_hash_init(struct tdb_context *tdb);
-
tdb_bool_err first_in_hash(struct tdb_context *tdb,
struct traverse_info *tinfo,
TDB_DATA *kbuf, size_t *dlen);
/* Put this record in a free list. */
enum TDB_ERROR add_free_record(struct tdb_context *tdb,
- tdb_off_t off, tdb_len_t len_with_header);
+ tdb_off_t off, tdb_len_t len_with_header,
+ enum tdb_lock_flags waitflag,
+ bool coalesce_ok);
/* Set up header for a used/ftable/htable/chain record. */
enum TDB_ERROR set_header(struct tdb_context *tdb,
void *tdb_convert(const struct tdb_context *tdb, void *buf, tdb_len_t size);
/* Unmap and try to map the tdb. */
-void tdb_munmap(struct tdb_context *tdb);
+void tdb_munmap(struct tdb_file *file);
void tdb_mmap(struct tdb_context *tdb);
/* Either alloc a copy, or give direct access. Release frees or noop. */
enum TDB_ERROR tdb_read_convert(struct tdb_context *tdb, tdb_off_t off,
void *rec, size_t len);
-/* Adds a stat, if it's in range. */
-void add_stat_(struct tdb_context *tdb, uint64_t *stat, size_t val);
-#define add_stat(tdb, statname, val) \
- do { \
- if (unlikely((tdb)->stats)) \
- add_stat_((tdb), &(tdb)->stats->statname, (val)); \
- } while (0)
+/* Bump the seqnum (caller checks for tdb->flags & TDB_SEQNUM) */
+void tdb_inc_seqnum(struct tdb_context *tdb);
/* lock.c: */
-void tdb_lock_init(struct tdb_context *tdb);
-
/* Lock/unlock a range of hashes. */
enum TDB_ERROR tdb_lock_hashes(struct tdb_context *tdb,
tdb_off_t hash_lock, tdb_len_t hash_range,
tdb_off_t hash_lock,
tdb_len_t hash_range, int ltype);
+/* For closing the file. */
+void tdb_lock_cleanup(struct tdb_context *tdb);
+
/* Lock/unlock a particular free bucket. */
enum TDB_ERROR tdb_lock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off,
enum tdb_lock_flags waitflag);
/* Serialize db open. */
enum TDB_ERROR tdb_lock_open(struct tdb_context *tdb,
- enum tdb_lock_flags flags);
-void tdb_unlock_open(struct tdb_context *tdb);
+ int ltype, enum tdb_lock_flags flags);
+void tdb_unlock_open(struct tdb_context *tdb, int ltype);
bool tdb_has_open_lock(struct tdb_context *tdb);
/* Serialize db expand. */
/* If it needs recovery, grab all the locks and do it. */
enum TDB_ERROR tdb_lock_and_recover(struct tdb_context *tdb);
+/* Default lock and unlock functions. */
+int tdb_fcntl_lock(int fd, int rw, off_t off, off_t len, bool waitflag, void *);
+int tdb_fcntl_unlock(int fd, int rw, off_t off, off_t len, void *);
+
/* transaction.c: */
enum TDB_ERROR tdb_transaction_recover(struct tdb_context *tdb);
tdb_bool_err tdb_needs_recovery(struct tdb_context *tdb);
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