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r2034: Allow user-selectable hash functions on open only.

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Jeremy.
This commit is contained in:
Jeremy Allison 2004-08-25 01:12:59 +00:00 committed by Gerald (Jerry) Carter
parent eddb31d196
commit b43320ee5c
3 changed files with 22 additions and 17 deletions
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32
source/lib/tdb/common/tdb.c
View File

@ -331,7 +331,7 @@ static int tdb_unlock(TDB_CONTEXT *tdb, int list, int ltype)
}
/* This is based on the hash algorithm from gdbm */
static u32 tdb_hash(TDB_DATA *key)
static u32 default_tdb_hash(TDB_DATA *key)
{
u32 value; /* Used to compute the hash value. */
u32 i; /* Used to cycle through random values. */
@ -1171,7 +1171,7 @@ TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key)
u32 hash;
/* find which hash bucket it is in */
hash = tdb_hash(&key);
hash = tdb->hash_fn(&key);
if (!(rec_ptr = tdb_find_lock_hash(tdb,key,hash,F_RDLCK,&rec)))
return tdb_null;
@ -1203,7 +1203,7 @@ static int tdb_exists_hash(TDB_CONTEXT *tdb, TDB_DATA key, u32 hash)
int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key)
{
u32 hash = tdb_hash(&key);
u32 hash = tdb->hash_fn(&key);
return tdb_exists_hash(tdb, key, hash);
}
@ -1463,7 +1463,7 @@ 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_hash(tdb, oldkey, tdb_hash(&oldkey), F_WRLCK, &rec);
tdb->travlocks.off = tdb_find_lock_hash(tdb, oldkey, tdb->hash_fn(&oldkey), F_WRLCK, &rec);
if (!tdb->travlocks.off)
return tdb_null;
tdb->travlocks.hash = BUCKET(rec.full_hash);
@ -1507,7 +1507,7 @@ static int tdb_delete_hash(TDB_CONTEXT *tdb, TDB_DATA key, u32 hash)
int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key)
{
u32 hash = tdb_hash(&key);
u32 hash = tdb->hash_fn(&key);
return tdb_delete_hash(tdb, key, hash);
}
@ -1525,7 +1525,7 @@ int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag)
int ret = 0;
/* find which hash bucket it is in */
hash = tdb_hash(&key);
hash = tdb->hash_fn(&key);
if (!tdb_keylocked(tdb, hash))
return -1;
if (tdb_lock(tdb, BUCKET(hash), F_WRLCK) == -1)
@ -1643,7 +1643,7 @@ int tdb_append(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA new_dbuf)
size_t new_data_size = 0;
/* find which hash bucket it is in */
hash = tdb_hash(&key);
hash = tdb->hash_fn(&key);
if (!tdb_keylocked(tdb, hash))
return -1;
if (tdb_lock(tdb, BUCKET(hash), F_WRLCK) == -1)
@ -1752,13 +1752,14 @@ static int tdb_already_open(dev_t device,
TDB_CONTEXT *tdb_open(const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode)
{
return tdb_open_ex(name, hash_size, tdb_flags, open_flags, mode, NULL);
return tdb_open_ex(name, hash_size, tdb_flags, open_flags, mode, NULL, NULL);
}
TDB_CONTEXT *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode,
tdb_log_func log_fn)
tdb_log_func log_fn,
tdb_hash_func hash_fn)
{
TDB_CONTEXT *tdb;
struct stat st;
@ -1778,7 +1779,8 @@ TDB_CONTEXT *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
tdb->flags = tdb_flags;
tdb->open_flags = open_flags;
tdb->log_fn = log_fn;
tdb->hash_fn = hash_fn ? hash_fn : default_tdb_hash;
if ((open_flags & O_ACCMODE) == O_WRONLY) {
TDB_LOG((tdb, 0, "tdb_open_ex: can't open tdb %s write-only\n",
name));
@ -2023,7 +2025,7 @@ int tdb_lockkeys(TDB_CONTEXT *tdb, u32 number, TDB_DATA keys[])
/* Insertion sort by bucket */
for (i = 0; i < number; i++) {
hash = tdb_hash(&keys[i]);
hash = tdb->hash_fn(&keys[i]);
for (j = 0; j < i && BUCKET(tdb->lockedkeys[j+1]) < BUCKET(hash); j++);
memmove(&tdb->lockedkeys[j+2], &tdb->lockedkeys[j+1], sizeof(u32) * (i-j));
tdb->lockedkeys[j+1] = hash;
@ -2058,22 +2060,22 @@ void tdb_unlockkeys(TDB_CONTEXT *tdb)
contention - it cannot guarantee how many records will be locked */
int tdb_chainlock(TDB_CONTEXT *tdb, TDB_DATA key)
{
return tdb_lock(tdb, BUCKET(tdb_hash(&key)), F_WRLCK);
return tdb_lock(tdb, BUCKET(tdb->hash_fn(&key)), F_WRLCK);
}
int tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key)
{
return tdb_unlock(tdb, BUCKET(tdb_hash(&key)), F_WRLCK);
return tdb_unlock(tdb, BUCKET(tdb->hash_fn(&key)), F_WRLCK);
}
int tdb_chainlock_read(TDB_CONTEXT *tdb, TDB_DATA key)
{
return tdb_lock(tdb, BUCKET(tdb_hash(&key)), F_RDLCK);
return tdb_lock(tdb, BUCKET(tdb->hash_fn(&key)), F_RDLCK);
}
int tdb_chainunlock_read(TDB_CONTEXT *tdb, TDB_DATA key)
{
return tdb_unlock(tdb, BUCKET(tdb_hash(&key)), F_RDLCK);
return tdb_unlock(tdb, BUCKET(tdb->hash_fn(&key)), F_RDLCK);
}

5
source/lib/tdb/include/tdb.h
View File

@ -102,6 +102,7 @@ typedef struct tdb_context {
dev_t device; /* uniquely identifies this tdb */
ino_t inode; /* uniquely identifies this tdb */
void (*log_fn)(struct tdb_context *tdb, int level, const char *, ...); /* logging function */
u32 (*hash_fn)(TDB_DATA *key);
int open_flags; /* flags used in the open - needed by reopen */
} TDB_CONTEXT;
@ -109,12 +110,14 @@ void tdb_debug(TDB_CONTEXT *, int , const char *, ...);
typedef int (*tdb_traverse_func)(TDB_CONTEXT *, TDB_DATA, TDB_DATA, void *);
typedef void (*tdb_log_func)(TDB_CONTEXT *, int , const char *, ...);
typedef u32 (*tdb_hash_func)(TDB_DATA *key);
TDB_CONTEXT *tdb_open(const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode);
TDB_CONTEXT *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode,
tdb_log_func log_fn);
tdb_log_func log_fn,
tdb_hash_func hash_fn);
int tdb_reopen(TDB_CONTEXT *tdb);
int tdb_reopen_all(void);

2
source/lib/tdb_helper.c
View File

@ -59,7 +59,7 @@ TDB_CONTEXT *tdb_open_log(const char *name, int hash_size, int tdb_flags,
tdb_flags |= TDB_NOMMAP;
tdb = tdb_open_ex(name, hash_size, tdb_flags,
open_flags, mode, tdb_log);
open_flags, mode, tdb_log, NULL);
if (!tdb)
return NULL;