#include "config.h"
#include <ccan/tdb2/tdb2.h>
#include <ccan/likely/likely.h>
+#include <ccan/compiler/compiler.h>
#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#endif
#define TDB_VERSION ((uint64_t)(0x26011967 + 7))
#define TDB_MAGIC ((uint64_t)0x1999)
#define TDB_FREE_MAGIC ((uint64_t)0xFE)
-#define TDB_COALESCING_MAGIC ((uint64_t)0xFD)
#define TDB_HASH_MAGIC (0xA1ABE11A01092008ULL)
-#define TDB_RECOVERY_MAGIC (0xf53bc0e7U)
-#define TDB_RECOVERY_INVALID_MAGIC (0x0)
+#define TDB_RECOVERY_MAGIC (0xf53bc0e7ad124589ULL)
+#define TDB_RECOVERY_INVALID_MAGIC (0x0ULL)
#define TDB_OFF_ERR ((tdb_off_t)-1)
#define TDB_SUBLEVEL_HASH_BITS 6
/* And 8 entries in each group, ie 8 groups per sublevel. */
#define TDB_HASH_GROUP_BITS 3
+/* This is currently 10: beyond this we chain. */
+#define TDB_MAX_LEVELS (1+(64-TDB_TOPLEVEL_HASH_BITS) / TDB_SUBLEVEL_HASH_BITS)
-/* Extend file by least 32 times larger than needed. */
-#define TDB_EXTENSION_FACTOR 32
+/* Extend file by least 100 times larger than needed. */
+#define TDB_EXTENSION_FACTOR 100
/* We steal bits from the offsets to store hash info. */
#define TDB_OFF_HASH_GROUP_MASK ((1ULL << TDB_HASH_GROUP_BITS) - 1)
/* We steal this many upper bits, giving a maximum offset of 64 exabytes. */
#define TDB_OFF_UPPER_STEAL 8
#define TDB_OFF_UPPER_STEAL_EXTRA 7
-#define TDB_OFF_UPPER_STEAL_TRUNCBIT 1
-/* If this is set, hash is truncated (only 1 bit is valid). */
-#define TDB_OFF_HASH_TRUNCATED_BIT 56
-/* The bit number where we store next level of hash. */
+/* The bit number where we store extra hash bits. */
#define TDB_OFF_HASH_EXTRA_BIT 57
+#define TDB_OFF_UPPER_STEAL_SUBHASH_BIT 56
+
+/* The bit number where we store the extra hash bits. */
/* Convenience mask to get actual offset. */
#define TDB_OFF_MASK \
(((1ULL << (64 - TDB_OFF_UPPER_STEAL)) - 1) - TDB_OFF_HASH_GROUP_MASK)
#define TDB_MIN_DATA_LEN \
(sizeof(struct tdb_free_record) - sizeof(struct tdb_used_record))
+/* Indicates this entry is not on an flist (can happen during coalescing) */
+#define TDB_FLIST_NONE ((1ULL << TDB_OFF_UPPER_STEAL) - 1)
+
#if !HAVE_BSWAP_64
static inline uint64_t bswap_64(uint64_t x)
{
}
struct tdb_free_record {
- uint64_t magic_and_meta; /* TDB_OFF_UPPER_STEAL bits of magic */
- uint64_t data_len; /* Not counting these two fields. */
- /* This is why the minimum record size is 16 bytes. */
- uint64_t next, prev;
+ uint64_t magic_and_prev; /* TDB_OFF_UPPER_STEAL bits magic, then prev */
+ uint64_t flist_and_len; /* Len not counting these two fields. */
+ /* This is why the minimum record size is 8 bytes. */
+ uint64_t next;
};
+static inline uint64_t frec_prev(const struct tdb_free_record *f)
+{
+ return f->magic_and_prev & ((1ULL << (64 - TDB_OFF_UPPER_STEAL)) - 1);
+}
+
static inline uint64_t frec_magic(const struct tdb_free_record *f)
{
- return f->magic_and_meta >> (64 - TDB_OFF_UPPER_STEAL);
+ return f->magic_and_prev >> (64 - TDB_OFF_UPPER_STEAL);
}
-static inline uint64_t frec_flist(const struct tdb_free_record *f)
+static inline uint64_t frec_len(const struct tdb_free_record *f)
{
- return f->magic_and_meta & ((1ULL << (64 - TDB_OFF_UPPER_STEAL)) - 1);
+ return f->flist_and_len & ((1ULL << (64 - TDB_OFF_UPPER_STEAL))-1);
}
+static inline unsigned frec_flist(const struct tdb_free_record *f)
+{
+ return f->flist_and_len >> (64 - TDB_OFF_UPPER_STEAL);
+}
+
+struct tdb_recovery_record {
+ uint64_t magic;
+ /* Length of record. */
+ uint64_t max_len;
+ /* Length used. */
+ uint64_t len;
+ /* Old length of file before transaction. */
+ uint64_t eof;
+};
+
+/* If we bottom out of the subhashes, we chain. */
+struct tdb_chain {
+ tdb_off_t rec[1 << TDB_HASH_GROUP_BITS];
+ tdb_off_t next;
+};
+
/* this is stored at the front of every database */
struct tdb_header {
char magic_food[64]; /* for /etc/magic */
uint64_t hash_test; /* result of hashing HASH_MAGIC. */
uint64_t hash_seed; /* "random" seed written at creation time. */
tdb_off_t free_list; /* (First) free list. */
+ tdb_off_t recovery; /* Transaction recovery area. */
- tdb_off_t reserved[27];
+ tdb_off_t reserved[26];
/* Top level hash table. */
tdb_off_t hashtable[1ULL << TDB_TOPLEVEL_HASH_BITS];
/* We ignore groups here, and treat it as a big array. */
unsigned entry;
unsigned int total_buckets;
- } levels[64 / TDB_SUBLEVEL_HASH_BITS];
+ } levels[TDB_MAX_LEVELS + 1];
unsigned int num_levels;
unsigned int toplevel_group;
/* This makes delete-everything-inside-traverse work as expected. */
TDB_LOCK_WAIT = 1,
/* If set, don't log an error on failure. */
TDB_LOCK_PROBE = 2,
+ /* If set, don't check for recovery (used by recovery code). */
+ TDB_LOCK_NOCHECK = 4,
};
struct tdb_lock_type {
uint32_t ltype;
};
+/* This is only needed for tdb_access_commit, but used everywhere to
+ * simplify. */
+struct tdb_access_hdr {
+ struct tdb_access_hdr *next;
+ tdb_off_t off;
+ tdb_len_t len;
+ bool convert;
+};
+
struct tdb_context {
/* Filename of the database. */
const char *name;
uint32_t flags;
/* Logging function */
- tdb_logfn_t log;
- void *log_priv;
+ tdb_logfn_t logfn;
+ void *log_private;
/* Hash function. */
tdb_hashfn_t khash;
/* What freelist are we using? */
uint64_t flist_off;
+ unsigned int flist;
/* IO methods: changes for transactions. */
const struct tdb_methods *methods;
/* Lock information */
struct tdb_lock_type allrecord_lock;
- uint64_t num_lockrecs;
+ 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;
int (*write)(struct tdb_context *, tdb_off_t, const void *, tdb_len_t);
int (*oob)(struct tdb_context *, tdb_off_t, bool);
int (*expand_file)(struct tdb_context *, tdb_len_t);
- void *(*direct)(struct tdb_context *, tdb_off_t, size_t);
+ void *(*direct)(struct tdb_context *, tdb_off_t, size_t, bool);
};
/*
tdb_off_t off, tdb_len_t len_with_header);
/* Set up header for a used record. */
-int set_header(struct tdb_context *tdb,
- struct tdb_used_record *rec,
- uint64_t keylen, uint64_t datalen,
- uint64_t actuallen, unsigned hashlow);
+int set_used_header(struct tdb_context *tdb,
+ struct tdb_used_record *rec,
+ uint64_t keylen, uint64_t datalen,
+ uint64_t actuallen, unsigned hashlow);
/* Used by tdb_check to verify. */
unsigned int size_to_bucket(tdb_len_t data_len);
tdb_off_t bucket_off(tdb_off_t flist_off, unsigned bucket);
+/* Used by tdb_summary */
+size_t dead_space(struct tdb_context *tdb, tdb_off_t off);
+
/* io.c: */
/* Initialize tdb->methods. */
void tdb_io_init(struct tdb_context *tdb);
void tdb_munmap(struct tdb_context *tdb);
void tdb_mmap(struct tdb_context *tdb);
-/* Either make a copy into pad and return that, or return ptr into mmap.
- * Converts endian (ie. will use pad in that case). */
-void *tdb_get(struct tdb_context *tdb, tdb_off_t off, void *pad, size_t len);
-
/* Either alloc a copy, or give direct access. Release frees or noop. */
const void *tdb_access_read(struct tdb_context *tdb,
tdb_off_t off, tdb_len_t len, bool convert);
int 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)
/* lock.c: */
void tdb_lock_init(struct tdb_context *tdb);
enum tdb_lock_flags waitflag);
void tdb_unlock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off);
-/* Do we have any locks? */
-bool tdb_has_locks(struct tdb_context *tdb);
+/* Serialize transaction start. */
+int tdb_transaction_lock(struct tdb_context *tdb, int ltype);
+int tdb_transaction_unlock(struct tdb_context *tdb, int ltype);
+
+/* Do we have any hash locks (ie. via tdb_chainlock) ? */
+bool tdb_has_hash_locks(struct tdb_context *tdb);
/* Lock entire database. */
int tdb_allrecord_lock(struct tdb_context *tdb, int ltype,
enum tdb_lock_flags flags, bool upgradable);
int tdb_allrecord_unlock(struct tdb_context *tdb, int ltype);
+int tdb_allrecord_upgrade(struct tdb_context *tdb);
/* Serialize db open. */
-int tdb_lock_open(struct tdb_context *tdb);
+int tdb_lock_open(struct tdb_context *tdb, enum tdb_lock_flags flags);
void tdb_unlock_open(struct tdb_context *tdb);
+bool tdb_has_open_lock(struct tdb_context *tdb);
/* Serialize db expand. */
int tdb_lock_expand(struct tdb_context *tdb, int ltype);
void tdb_unlock_expand(struct tdb_context *tdb, int ltype);
bool tdb_has_expansion_lock(struct tdb_context *tdb);
+/* If it needs recovery, grab all the locks and do it. */
+int tdb_lock_and_recover(struct tdb_context *tdb);
/* traverse.c: */
int first_in_hash(struct tdb_context *tdb, int ltype,
struct traverse_info *tinfo,
TDB_DATA *kbuf, size_t *dlen);
-
-#if 0
-/* Low-level locking primitives. */
-int tdb_nest_lock(struct tdb_context *tdb, tdb_off_t offset, int ltype,
- enum tdb_lock_flags flags);
-int tdb_nest_unlock(struct tdb_context *tdb, tdb_off_t offset, int ltype);
-
-int tdb_munmap(struct tdb_context *tdb);
-void tdb_mmap(struct tdb_context *tdb);
-int tdb_lock(struct tdb_context *tdb, int list, int ltype);
-int tdb_lock_nonblock(struct tdb_context *tdb, int list, int ltype);
-bool tdb_have_locks(struct tdb_context *tdb);
-int tdb_unlock(struct tdb_context *tdb, int list, int ltype);
-int tdb_brlock(struct tdb_context *tdb,
- int rw_type, tdb_off_t offset, size_t len,
- enum tdb_lock_flags flags);
-int tdb_brunlock(struct tdb_context *tdb,
- int rw_type, tdb_off_t offset, size_t len);
-bool tdb_have_extra_locks(struct tdb_context *tdb);
-void tdb_release_extra_locks(struct tdb_context *tdb);
-int tdb_transaction_lock(struct tdb_context *tdb, int ltype);
-int tdb_transaction_unlock(struct tdb_context *tdb, int ltype);
-int tdb_allrecord_lock(struct tdb_context *tdb, int ltype,
- enum tdb_lock_flags flags, bool upgradable);
-int tdb_allrecord_unlock(struct tdb_context *tdb, int ltype);
-int tdb_allrecord_upgrade(struct tdb_context *tdb);
-int tdb_write_lock_record(struct tdb_context *tdb, tdb_off_t off);
-int tdb_write_unlock_record(struct tdb_context *tdb, tdb_off_t off);
-int tdb_ofs_read(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
-int tdb_ofs_write(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
-int tdb_free(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec);
-tdb_off_t tdb_allocate(struct tdb_context *tdb, tdb_len_t length, struct tdb_record *rec);
-int tdb_ofs_read(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
-int tdb_ofs_write(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
-int tdb_lock_record(struct tdb_context *tdb, tdb_off_t off);
-int tdb_unlock_record(struct tdb_context *tdb, tdb_off_t off);
+/* transaction.c: */
+int tdb_transaction_recover(struct tdb_context *tdb);
bool tdb_needs_recovery(struct tdb_context *tdb);
-int tdb_rec_read(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec);
-int tdb_rec_write(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec);
-int tdb_do_delete(struct tdb_context *tdb, tdb_off_t rec_ptr, struct tdb_record *rec);
-unsigned char *tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset, tdb_len_t len);
-int tdb_parse_data(struct tdb_context *tdb, TDB_DATA key,
- tdb_off_t offset, tdb_len_t len,
- int (*parser)(TDB_DATA key, TDB_DATA data,
- void *private_data),
- void *private_data);
-tdb_off_t tdb_find_lock_hash(struct tdb_context *tdb, TDB_DATA key, uint32_t hash, int locktype,
- struct tdb_record *rec);
-void tdb_io_init(struct tdb_context *tdb);
-int tdb_expand(struct tdb_context *tdb, tdb_off_t size);
-int tdb_rec_free_read(struct tdb_context *tdb, tdb_off_t off,
- struct tdb_record *rec);
-#endif
+
+/* tdb.c: */
+void COLD tdb_logerr(struct tdb_context *tdb,
+ enum TDB_ERROR ecode,
+ enum tdb_debug_level level,
+ const char *fmt, ...);
#ifdef TDB_TRACE
void tdb_trace(struct tdb_context *tdb, const char *op);
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