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Commit 44894c39 authored by Yoni Fogel's avatar Yoni Fogel
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Addresses #368 

Deals with NULL transactions in an INIT_TXN environment.
Does not deal with NULL txn cursors yet.
Also adds DB_AUTO_COMMIT

git-svn-id: file:///svn/tokudb@2252 c7de825b-a66e-492c-adef-691d508d4ae1
parent 2d5e34ef
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Showing with 215 additions and 87 deletions
newbrt/brt.c
View file @ 44894c39
...@@ -1999,10 +1999,14 @@ static inline void brt_cursor_cleanup(BRT_CURSOR cursor) { ...@@ -1999,10 +1999,14 @@ static inline void brt_cursor_cleanup(BRT_CURSOR cursor) {
dbt_cleanup(&cursor->val); dbt_cleanup(&cursor->val);
} }
inline int brt_cursor_not_set(BRT_CURSOR cursor) { static inline int brt_cursor_not_set(BRT_CURSOR cursor) {
return cursor->key.data == 0 || cursor->val.data == 0; return cursor->key.data == 0 || cursor->val.data == 0;
} }
BOOL toku_brt_cursor_uninitialized(BRT_CURSOR c) {
return brt_cursor_not_set(c);
}
static inline void brt_cursor_set_key_val(BRT_CURSOR cursor, DBT *newkey, DBT *newval) { static inline void brt_cursor_set_key_val(BRT_CURSOR cursor, DBT *newkey, DBT *newval) {
brt_cursor_cleanup(cursor); brt_cursor_cleanup(cursor);
cursor->key = *newkey; memset(newkey, 0, sizeof *newkey); cursor->key = *newkey; memset(newkey, 0, sizeof *newkey);
......
newbrt/brt.h
View file @ 44894c39
...@@ -51,6 +51,7 @@ int toku_brt_cursor (BRT, BRT_CURSOR*); ...@@ -51,6 +51,7 @@ int toku_brt_cursor (BRT, BRT_CURSOR*);
int toku_brt_cursor_get (BRT_CURSOR cursor, DBT *kbt, DBT *vbt, int brtc_flags, TOKUTXN); int toku_brt_cursor_get (BRT_CURSOR cursor, DBT *kbt, DBT *vbt, int brtc_flags, TOKUTXN);
int toku_brt_cursor_delete(BRT_CURSOR cursor, int flags, TOKUTXN); int toku_brt_cursor_delete(BRT_CURSOR cursor, int flags, TOKUTXN);
int toku_brt_cursor_close (BRT_CURSOR curs); int toku_brt_cursor_close (BRT_CURSOR curs);
BOOL toku_brt_cursor_uninitialized(BRT_CURSOR c);
typedef struct brtenv *BRTENV; typedef struct brtenv *BRTENV;
int brtenv_checkpoint (BRTENV env); int brtenv_checkpoint (BRTENV env);
......
src/lock_tree/locktree.c
View file @ 44894c39
...@@ -44,7 +44,7 @@ char* toku_lt_strerror(TOKU_LT_ERROR r) { ...@@ -44,7 +44,7 @@ char* toku_lt_strerror(TOKU_LT_ERROR r) {
return "Unknown error in locking data structures.\n"; return "Unknown error in locking data structures.\n";
} }
/* Compare two payloads assuming that at least one of them is infinite */ /* Compare two payloads assuming that at least one of them is infinite */
static int __toku_infinite_compare(void* a, void* b) { inline static int __toku_infinite_compare(void* a, void* b) {
if (a == b) return 0; if (a == b) return 0;
if (a == toku_lt_infinity) return 1; if (a == toku_lt_infinity) return 1;
if (b == toku_lt_infinity) return -1; if (b == toku_lt_infinity) return -1;
...@@ -52,7 +52,7 @@ static int __toku_infinite_compare(void* a, void* b) { ...@@ -52,7 +52,7 @@ static int __toku_infinite_compare(void* a, void* b) {
assert(b == toku_lt_neg_infinity); return 1; assert(b == toku_lt_neg_infinity); return 1;
} }
static BOOL __toku_lt_is_infinite(const void* p) { inline static BOOL __toku_lt_is_infinite(const void* p) {
if (p == toku_lt_infinity || p == toku_lt_neg_infinity) { if (p == toku_lt_infinity || p == toku_lt_neg_infinity) {
DBT* dbt = (DBT*)p; DBT* dbt = (DBT*)p;
assert(!dbt->data && !dbt->size); assert(!dbt->data && !dbt->size);
...@@ -63,19 +63,19 @@ static BOOL __toku_lt_is_infinite(const void* p) { ...@@ -63,19 +63,19 @@ static BOOL __toku_lt_is_infinite(const void* p) {
/* Verifies that NULL data and size are consistent. /* Verifies that NULL data and size are consistent.
i.e. The size is 0 if and only if the data is NULL. */ i.e. The size is 0 if and only if the data is NULL. */
static void __toku_lt_verify_null_key(const DBT* key) { inline static int __toku_lt_verify_null_key(const DBT* key) {
assert(!key || __toku_lt_is_infinite(key) || if (key && key->size && !key->data) return EINVAL;
(key->size > 0) == (key->data != NULL)); return 0;
} }
static DBT* __toku_recreate_DBT(DBT* dbt, void* payload, u_int32_t length) { inline static DBT* __toku_recreate_DBT(DBT* dbt, void* payload, u_int32_t length) {
memset(dbt, 0, sizeof(DBT)); memset(dbt, 0, sizeof(DBT));
dbt->data = payload; dbt->data = payload;
dbt->size = length; dbt->size = length;
return dbt; return dbt;
} }
static int __toku_lt_txn_cmp(void* a, void* b) { inline static int __toku_lt_txn_cmp(void* a, void* b) {
return a < b ? -1 : (a != b); return a < b ? -1 : (a != b);
} }
...@@ -118,27 +118,27 @@ int __toku_lt_point_cmp(void* a, void* b) { ...@@ -118,27 +118,27 @@ int __toku_lt_point_cmp(void* a, void* b) {
/* Functions to update the range count and compare it with the /* Functions to update the range count and compare it with the
maximum number of ranges */ maximum number of ranges */
static BOOL __toku_lt_range_test_incr(toku_lock_tree* tree, u_int32_t replace) { inline static BOOL __toku_lt_range_test_incr(toku_lock_tree* tree, u_int32_t replace) {
assert(tree); assert(tree);
assert(tree->num_ranges); assert(tree->num_ranges);
assert(replace <= *tree->num_ranges); assert(replace <= *tree->num_ranges);
return *tree->num_ranges - replace < tree->max_ranges; return *tree->num_ranges - replace < tree->max_ranges;
} }
static void __toku_lt_range_incr(toku_lock_tree* tree, u_int32_t replace) { inline static void __toku_lt_range_incr(toku_lock_tree* tree, u_int32_t replace) {
assert(__toku_lt_range_test_incr(tree, replace)); assert(__toku_lt_range_test_incr(tree, replace));
*tree->num_ranges -= replace; *tree->num_ranges -= replace;
*tree->num_ranges += 1; *tree->num_ranges += 1;
} }
static void __toku_lt_range_decr(toku_lock_tree* tree, u_int32_t ranges) { inline static void __toku_lt_range_decr(toku_lock_tree* tree, u_int32_t ranges) {
assert(tree); assert(tree);
assert(tree->num_ranges); assert(tree->num_ranges);
assert(*tree->num_ranges >= ranges); assert(*tree->num_ranges >= ranges);
*tree->num_ranges -= ranges; *tree->num_ranges -= ranges;
} }
static void __toku_p_free(toku_lock_tree* tree, toku_point* point) { inline static void __toku_p_free(toku_lock_tree* tree, toku_point* point) {
assert(point); assert(point);
if (!__toku_lt_is_infinite(point->key_payload)) { if (!__toku_lt_is_infinite(point->key_payload)) {
tree->free(point->key_payload); tree->free(point->key_payload);
...@@ -152,7 +152,7 @@ static void __toku_p_free(toku_lock_tree* tree, toku_point* point) { ...@@ -152,7 +152,7 @@ static void __toku_p_free(toku_lock_tree* tree, toku_point* point) {
/* /*
Allocate and copy the payload. Allocate and copy the payload.
*/ */
static int __toku_payload_copy(toku_lock_tree* tree, inline static int __toku_payload_copy(toku_lock_tree* tree,
void** payload_out, u_int32_t* len_out, void** payload_out, u_int32_t* len_out,
void* payload_in, u_int32_t len_in) { void* payload_in, u_int32_t len_in) {
assert(payload_out && len_out); assert(payload_out && len_out);
...@@ -171,7 +171,7 @@ static int __toku_payload_copy(toku_lock_tree* tree, ...@@ -171,7 +171,7 @@ static int __toku_payload_copy(toku_lock_tree* tree,
return 0; return 0;
} }
static int __toku_p_makecopy(toku_lock_tree* tree, void** ppoint) { inline static int __toku_p_makecopy(toku_lock_tree* tree, void** ppoint) {
assert(ppoint); assert(ppoint);
toku_point* point = *(toku_point**)ppoint; toku_point* point = *(toku_point**)ppoint;
toku_point* temp_point = NULL; toku_point* temp_point = NULL;
...@@ -219,7 +219,7 @@ toku_range_tree* __toku_lt_ifexist_selfwrite(toku_lock_tree* tree, ...@@ -219,7 +219,7 @@ toku_range_tree* __toku_lt_ifexist_selfwrite(toku_lock_tree* tree,
/* Provides access to a selfread tree for a particular transaction. /* Provides access to a selfread tree for a particular transaction.
Creates it if it does not exist. */ Creates it if it does not exist. */
static int __toku_lt_selfread(toku_lock_tree* tree, DB_TXN* txn, inline static int __toku_lt_selfread(toku_lock_tree* tree, DB_TXN* txn,
toku_range_tree** pselfread) { toku_range_tree** pselfread) {
int r; int r;
assert(tree && txn && pselfread); assert(tree && txn && pselfread);
...@@ -246,7 +246,7 @@ static int __toku_lt_selfread(toku_lock_tree* tree, DB_TXN* txn, ...@@ -246,7 +246,7 @@ static int __toku_lt_selfread(toku_lock_tree* tree, DB_TXN* txn,
/* Provides access to a selfwrite tree for a particular transaction. /* Provides access to a selfwrite tree for a particular transaction.
Creates it if it does not exist. */ Creates it if it does not exist. */
static int __toku_lt_selfwrite(toku_lock_tree* tree, DB_TXN* txn, inline static int __toku_lt_selfwrite(toku_lock_tree* tree, DB_TXN* txn,
toku_range_tree** pselfwrite) { toku_range_tree** pselfwrite) {
int r; int r;
assert(tree && txn && pselfwrite); assert(tree && txn && pselfwrite);
...@@ -276,7 +276,7 @@ static int __toku_lt_selfwrite(toku_lock_tree* tree, DB_TXN* txn, ...@@ -276,7 +276,7 @@ static int __toku_lt_selfwrite(toku_lock_tree* tree, DB_TXN* txn,
Uses the standard definition of dominated from the design document. Uses the standard definition of dominated from the design document.
Determines whether 'query' is dominated by 'rt'. Determines whether 'query' is dominated by 'rt'.
*/ */
static int __toku_lt_rt_dominates(toku_lock_tree* tree, toku_range* query, inline static int __toku_lt_rt_dominates(toku_lock_tree* tree, toku_range* query,
toku_range_tree* rt, BOOL* dominated) { toku_range_tree* rt, BOOL* dominated) {
assert(tree && query && dominated); assert(tree && query && dominated);
if (!rt) { if (!rt) {
...@@ -321,7 +321,7 @@ typedef enum ...@@ -321,7 +321,7 @@ typedef enum
If exactly one range overlaps and its data != self, there might be a If exactly one range overlaps and its data != self, there might be a
conflict. We need to check the 'peer'write table to verify. conflict. We need to check the 'peer'write table to verify.
*/ */
static int __toku_lt_borderwrite_conflict(toku_lock_tree* tree, DB_TXN* self, inline static int __toku_lt_borderwrite_conflict(toku_lock_tree* tree, DB_TXN* self,
toku_range* query, toku_range* query,
toku_conflict* conflict, DB_TXN** peer) { toku_conflict* conflict, DB_TXN** peer) {
assert(tree && self && query && conflict && peer); assert(tree && self && query && conflict && peer);
...@@ -355,7 +355,7 @@ static int __toku_lt_borderwrite_conflict(toku_lock_tree* tree, DB_TXN* self, ...@@ -355,7 +355,7 @@ static int __toku_lt_borderwrite_conflict(toku_lock_tree* tree, DB_TXN* self,
Uses the standard definition of 'query' meets 'tree' at 'data' from the Uses the standard definition of 'query' meets 'tree' at 'data' from the
design document. design document.
*/ */
static int __toku_lt_meets(toku_lock_tree* tree, toku_range* query, inline static int __toku_lt_meets(toku_lock_tree* tree, toku_range* query,
toku_range_tree* rt, BOOL* met) { toku_range_tree* rt, BOOL* met) {
assert(tree && query && rt && met); assert(tree && query && rt && met);
const u_int32_t query_size = 1; const u_int32_t query_size = 1;
...@@ -385,7 +385,7 @@ static int __toku_lt_meets(toku_lock_tree* tree, toku_range* query, ...@@ -385,7 +385,7 @@ static int __toku_lt_meets(toku_lock_tree* tree, toku_range* query,
Uses the standard definition of 'query' meets 'tree' at 'data' from the Uses the standard definition of 'query' meets 'tree' at 'data' from the
design document. design document.
*/ */
static int __toku_lt_meets_peer(toku_lock_tree* tree, toku_range* query, inline static int __toku_lt_meets_peer(toku_lock_tree* tree, toku_range* query,
toku_range_tree* rt, DB_TXN* self, BOOL* met) { toku_range_tree* rt, DB_TXN* self, BOOL* met) {
assert(tree && query && rt && self && met); assert(tree && query && rt && self && met);
assert(query->left == query->right); assert(query->left == query->right);
...@@ -408,7 +408,7 @@ static int __toku_lt_meets_peer(toku_lock_tree* tree, toku_range* query, ...@@ -408,7 +408,7 @@ static int __toku_lt_meets_peer(toku_lock_tree* tree, toku_range* query,
Utility function to implement: (from design document) Utility function to implement: (from design document)
if K meets E at v'!=t and K meets W_v' then return failure. if K meets E at v'!=t and K meets W_v' then return failure.
*/ */
static int __toku_lt_check_borderwrite_conflict(toku_lock_tree* tree, inline static int __toku_lt_check_borderwrite_conflict(toku_lock_tree* tree,
DB_TXN* txn, toku_range* query) { DB_TXN* txn, toku_range* query) {
assert(tree && txn && query); assert(tree && txn && query);
toku_conflict conflict; toku_conflict conflict;
...@@ -433,18 +433,21 @@ static int __toku_lt_check_borderwrite_conflict(toku_lock_tree* tree, ...@@ -433,18 +433,21 @@ static int __toku_lt_check_borderwrite_conflict(toku_lock_tree* tree,
return 0; return 0;
} }
static void __toku_payload_from_dbt(void** payload, u_int32_t* len, inline static void __toku_payload_from_dbt(void** payload, u_int32_t* len,
const DBT* dbt) { const DBT* dbt) {
assert(payload && len && dbt); assert(payload && len && dbt);
if (__toku_lt_is_infinite(dbt)) *payload = (void*)dbt; if (__toku_lt_is_infinite(dbt)) *payload = (void*)dbt;
else { else if (!dbt->size) {
assert(!dbt->data == !dbt->size); *payload = NULL;
*len = 0;
} else {
assert(dbt->data);
*payload = dbt->data; *payload = dbt->data;
*len = dbt->size;
} }
*len = dbt->size;
} }
static void __toku_init_point(toku_point* point, toku_lock_tree* tree, inline static void __toku_init_point(toku_point* point, toku_lock_tree* tree,
const DBT* key, const DBT* data) { const DBT* key, const DBT* data) {
assert(point && tree && key); assert(point && tree && key);
assert(!tree->duplicates == !data); assert(!tree->duplicates == !data);
...@@ -463,14 +466,14 @@ static void __toku_init_point(toku_point* point, toku_lock_tree* tree, ...@@ -463,14 +466,14 @@ static void __toku_init_point(toku_point* point, toku_lock_tree* tree,
} }
} }
static void __toku_init_query(toku_range* query, inline static void __toku_init_query(toku_range* query,
toku_point* left, toku_point* right) { toku_point* left, toku_point* right) {
query->left = left; query->left = left;
query->right = right; query->right = right;
query->data = NULL; query->data = NULL;
} }
static void __toku_init_insert(toku_range* to_insert, inline static void __toku_init_insert(toku_range* to_insert,
toku_point* left, toku_point* right, toku_point* left, toku_point* right,
DB_TXN* txn) { DB_TXN* txn) {
to_insert->left = left; to_insert->left = left;
...@@ -480,12 +483,12 @@ static void __toku_init_insert(toku_range* to_insert, ...@@ -480,12 +483,12 @@ static void __toku_init_insert(toku_range* to_insert,
/* Returns whether the point already exists /* Returns whether the point already exists
as an endpoint of the given range. */ as an endpoint of the given range. */
static BOOL __toku_lt_p_independent(toku_point* point, toku_range* range) { inline static BOOL __toku_lt_p_independent(toku_point* point, toku_range* range) {
assert(point && range); assert(point && range);
return point != range->left && point != range->right; return point != range->left && point != range->right;
} }
static int __toku_lt_extend_extreme(toku_lock_tree* tree,toku_range* to_insert, inline static int __toku_lt_extend_extreme(toku_lock_tree* tree,toku_range* to_insert,
BOOL* alloc_left, BOOL* alloc_right, BOOL* alloc_left, BOOL* alloc_right,
u_int32_t numfound) { u_int32_t numfound) {
assert(to_insert && tree && alloc_left && alloc_right); assert(to_insert && tree && alloc_left && alloc_right);
...@@ -517,7 +520,7 @@ static int __toku_lt_extend_extreme(toku_lock_tree* tree,toku_range* to_insert, ...@@ -517,7 +520,7 @@ static int __toku_lt_extend_extreme(toku_lock_tree* tree,toku_range* to_insert,
return 0; return 0;
} }
static int __toku_lt_alloc_extreme(toku_lock_tree* tree, toku_range* to_insert, inline static int __toku_lt_alloc_extreme(toku_lock_tree* tree, toku_range* to_insert,
BOOL alloc_left, BOOL* alloc_right) { BOOL alloc_left, BOOL* alloc_right) {
assert(to_insert && alloc_right); assert(to_insert && alloc_right);
BOOL copy_left = FALSE; BOOL copy_left = FALSE;
...@@ -547,7 +550,7 @@ static int __toku_lt_alloc_extreme(toku_lock_tree* tree, toku_range* to_insert, ...@@ -547,7 +550,7 @@ static int __toku_lt_alloc_extreme(toku_lock_tree* tree, toku_range* to_insert,
return 0; return 0;
} }
static int __toku_lt_delete_overlapping_ranges(toku_lock_tree* tree, inline static int __toku_lt_delete_overlapping_ranges(toku_lock_tree* tree,
toku_range_tree* rt, toku_range_tree* rt,
u_int32_t numfound) { u_int32_t numfound) {
assert(tree && rt); assert(tree && rt);
...@@ -561,7 +564,7 @@ static int __toku_lt_delete_overlapping_ranges(toku_lock_tree* tree, ...@@ -561,7 +564,7 @@ static int __toku_lt_delete_overlapping_ranges(toku_lock_tree* tree,
return 0; return 0;
} }
static int __toku_lt_free_points(toku_lock_tree* tree, toku_range* to_insert, inline static int __toku_lt_free_points(toku_lock_tree* tree, toku_range* to_insert,
u_int32_t numfound, toku_range_tree *rt) { u_int32_t numfound, toku_range_tree *rt) {
assert(tree && to_insert); assert(tree && to_insert);
assert(numfound <= tree->buflen); assert(numfound <= tree->buflen);
...@@ -591,7 +594,7 @@ static int __toku_lt_free_points(toku_lock_tree* tree, toku_range* to_insert, ...@@ -591,7 +594,7 @@ static int __toku_lt_free_points(toku_lock_tree* tree, toku_range* to_insert,
} }
/* Consolidate the new range and all the overlapping ranges */ /* Consolidate the new range and all the overlapping ranges */
static int __toku_consolidate(toku_lock_tree* tree, inline static int __toku_consolidate(toku_lock_tree* tree,
toku_range* query, toku_range* to_insert, toku_range* query, toku_range* to_insert,
DB_TXN* txn) { DB_TXN* txn) {
int r; int r;
...@@ -656,7 +659,7 @@ static int __toku_consolidate(toku_lock_tree* tree, ...@@ -656,7 +659,7 @@ static int __toku_consolidate(toku_lock_tree* tree,
return 0; return 0;
} }
static void __toku_lt_init_full_query(toku_lock_tree* tree, toku_range* query, inline static void __toku_lt_init_full_query(toku_lock_tree* tree, toku_range* query,
toku_point* left, toku_point* right) { toku_point* left, toku_point* right) {
__toku_init_point(left, tree, (DBT*)toku_lt_neg_infinity, __toku_init_point(left, tree, (DBT*)toku_lt_neg_infinity,
tree->duplicates ? (DBT*)toku_lt_neg_infinity : NULL); tree->duplicates ? (DBT*)toku_lt_neg_infinity : NULL);
...@@ -665,7 +668,7 @@ static void __toku_lt_init_full_query(toku_lock_tree* tree, toku_range* query, ...@@ -665,7 +668,7 @@ static void __toku_lt_init_full_query(toku_lock_tree* tree, toku_range* query,
__toku_init_query(query, left, right); __toku_init_query(query, left, right);
} }
static int __toku_lt_free_contents_slow(toku_lock_tree* tree, inline static int __toku_lt_free_contents_slow(toku_lock_tree* tree,
toku_range_tree* rt, toku_range_tree* rt,
toku_range_tree* rtdel) { toku_range_tree* rtdel) {
int r; int r;
...@@ -693,7 +696,7 @@ static int __toku_lt_free_contents_slow(toku_lock_tree* tree, ...@@ -693,7 +696,7 @@ static int __toku_lt_free_contents_slow(toku_lock_tree* tree,
return r; return r;
} }
static int __toku_lt_free_contents(toku_lock_tree* tree, toku_range_tree* rt, inline static int __toku_lt_free_contents(toku_lock_tree* tree, toku_range_tree* rt,
toku_range_tree *rtdel) { toku_range_tree *rtdel) {
assert(tree); assert(tree);
if (!rt) return 0; if (!rt) return 0;
...@@ -716,7 +719,7 @@ static int __toku_lt_free_contents(toku_lock_tree* tree, toku_range_tree* rt, ...@@ -716,7 +719,7 @@ static int __toku_lt_free_contents(toku_lock_tree* tree, toku_range_tree* rt,
return r; return r;
} }
static BOOL __toku_r_backwards(toku_range* range) { inline static BOOL __toku_r_backwards(toku_range* range) {
assert(range && range->left && range->right); assert(range && range->left && range->right);
toku_point* left = (toku_point*)range->left; toku_point* left = (toku_point*)range->left;
toku_point* right = (toku_point*)range->right; toku_point* right = (toku_point*)range->right;
...@@ -728,7 +731,7 @@ static BOOL __toku_r_backwards(toku_range* range) { ...@@ -728,7 +731,7 @@ static BOOL __toku_r_backwards(toku_range* range) {
} }
static int __toku_lt_preprocess(toku_lock_tree* tree, DB_TXN* txn, inline static int __toku_lt_preprocess(toku_lock_tree* tree, DB_TXN* txn,
const DBT* key_left, const DBT** pdata_left, const DBT* key_left, const DBT** pdata_left,
const DBT* key_right, const DBT** pdata_right, const DBT* key_right, const DBT** pdata_right,
toku_point* left, toku_point* right, toku_point* left, toku_point* right,
...@@ -744,12 +747,13 @@ static int __toku_lt_preprocess(toku_lock_tree* tree, DB_TXN* txn, ...@@ -744,12 +747,13 @@ static int __toku_lt_preprocess(toku_lock_tree* tree, DB_TXN* txn,
if (tree->duplicates && key_right != data_right && if (tree->duplicates && key_right != data_right &&
__toku_lt_is_infinite(key_right)) return EINVAL; __toku_lt_is_infinite(key_right)) return EINVAL;
int r;
/* Verify that NULL keys have payload and size that are mutually /* Verify that NULL keys have payload and size that are mutually
consistent*/ consistent*/
__toku_lt_verify_null_key(key_left); if ((r = __toku_lt_verify_null_key(key_left)) != 0) return r;
__toku_lt_verify_null_key(data_left); if ((r = __toku_lt_verify_null_key(data_left)) != 0) return r;
__toku_lt_verify_null_key(key_right); if ((r = __toku_lt_verify_null_key(key_right)) != 0) return r;
__toku_lt_verify_null_key(data_right); if ((r = __toku_lt_verify_null_key(data_right)) != 0) return r;
__toku_init_point(left, tree, key_left, data_left); __toku_init_point(left, tree, key_left, data_left);
__toku_init_point(right, tree, key_right, data_right); __toku_init_point(right, tree, key_right, data_right);
...@@ -758,12 +762,12 @@ static int __toku_lt_preprocess(toku_lock_tree* tree, DB_TXN* txn, ...@@ -758,12 +762,12 @@ static int __toku_lt_preprocess(toku_lock_tree* tree, DB_TXN* txn,
if (__toku_r_backwards(query)) return EDOM; if (__toku_r_backwards(query)) return EDOM;
tree->dups_final = TRUE; tree->dups_final = TRUE;
int r = __toku_lt_callback(tree, txn); r = __toku_lt_callback(tree, txn);
if (r!=0) return r; if (r!=0) return r;
return 0; return 0;
} }
static int __toku_lt_get_border(toku_lock_tree* tree, BOOL in_borderwrite, inline static int __toku_lt_get_border(toku_lock_tree* tree, BOOL in_borderwrite,
toku_range* pred, toku_range* succ, toku_range* pred, toku_range* succ,
BOOL* found_p, BOOL* found_s, BOOL* found_p, BOOL* found_s,
toku_range* to_insert) { toku_range* to_insert) {
...@@ -780,7 +784,7 @@ static int __toku_lt_get_border(toku_lock_tree* tree, BOOL in_borderwrite, ...@@ -780,7 +784,7 @@ static int __toku_lt_get_border(toku_lock_tree* tree, BOOL in_borderwrite,
return 0; return 0;
} }
static int __toku_lt_expand_border(toku_lock_tree* tree, toku_range* to_insert, inline static int __toku_lt_expand_border(toku_lock_tree* tree, toku_range* to_insert,
toku_range* pred, toku_range* succ, toku_range* pred, toku_range* succ,
BOOL found_p, BOOL found_s) { BOOL found_p, BOOL found_s) {
assert(tree && to_insert && pred && succ); assert(tree && to_insert && pred && succ);
...@@ -798,7 +802,7 @@ static int __toku_lt_expand_border(toku_lock_tree* tree, toku_range* to_insert, ...@@ -798,7 +802,7 @@ static int __toku_lt_expand_border(toku_lock_tree* tree, toku_range* to_insert,
return 0; return 0;
} }
static int __toku_lt_split_border(toku_lock_tree* tree, toku_range* to_insert, inline static int __toku_lt_split_border(toku_lock_tree* tree, toku_range* to_insert,
toku_range* pred, toku_range* succ, toku_range* pred, toku_range* succ,
BOOL found_p, BOOL found_s) { BOOL found_p, BOOL found_s) {
assert(tree && to_insert && pred && succ); assert(tree && to_insert && pred && succ);
...@@ -850,7 +854,7 @@ static int __toku_lt_split_border(toku_lock_tree* tree, toku_range* to_insert, ...@@ -850,7 +854,7 @@ static int __toku_lt_split_border(toku_lock_tree* tree, toku_range* to_insert,
done with borderwrite. done with borderwrite.
insert point,point into selfwrite. insert point,point into selfwrite.
*/ */
static int __toku_lt_borderwrite_insert(toku_lock_tree* tree, inline static int __toku_lt_borderwrite_insert(toku_lock_tree* tree,
toku_range* query, toku_range* query,
toku_range* to_insert) { toku_range* to_insert) {
assert(tree && query && to_insert); assert(tree && query && to_insert);
...@@ -1083,7 +1087,13 @@ int toku_lt_acquire_range_write_lock(toku_lock_tree* tree, DB_TXN* txn, ...@@ -1083,7 +1087,13 @@ int toku_lt_acquire_range_write_lock(toku_lock_tree* tree, DB_TXN* txn,
toku_point left; toku_point left;
toku_point right; toku_point right;
toku_range query; toku_range query;
assert(tree);
if (key_left == key_right &&
(data_left == data_right || !tree->duplicates)) {
return toku_lt_acquire_write_lock(tree, txn, key_left, data_left);
}
r = __toku_lt_preprocess(tree, txn, key_left, &data_left, r = __toku_lt_preprocess(tree, txn, key_left, &data_left,
key_right, &data_right, key_right, &data_right,
&left, &right, &left, &right,
...@@ -1096,7 +1106,7 @@ int toku_lt_acquire_range_write_lock(toku_lock_tree* tree, DB_TXN* txn, ...@@ -1096,7 +1106,7 @@ int toku_lt_acquire_range_write_lock(toku_lock_tree* tree, DB_TXN* txn,
} }
static int __toku_sweep_border(toku_lock_tree* tree, toku_range* range) { inline static int __toku_sweep_border(toku_lock_tree* tree, toku_range* range) {
assert(tree && range); assert(tree && range);
toku_range_tree* borderwrite = tree->borderwrite; toku_range_tree* borderwrite = tree->borderwrite;
assert(borderwrite); assert(borderwrite);
...@@ -1164,7 +1174,7 @@ static int __toku_sweep_border(toku_lock_tree* tree, toku_range* range) { ...@@ -1164,7 +1174,7 @@ static int __toku_sweep_border(toku_lock_tree* tree, toku_range* range) {
If both found and pred.data=succ.data, merge pred and succ (expand?) If both found and pred.data=succ.data, merge pred and succ (expand?)
free_points free_points
*/ */
static int __toku_lt_border_delete(toku_lock_tree* tree, toku_range_tree* rt) { inline static int __toku_lt_border_delete(toku_lock_tree* tree, toku_range_tree* rt) {
int r; int r;
assert(tree); assert(tree);
if (!rt) return 0; if (!rt) return 0;
......
src/ydb.c
View file @ 44894c39
...@@ -514,9 +514,17 @@ static void toku_env_set_errpfx(DB_ENV * env, const char *errpfx) { ...@@ -514,9 +514,17 @@ static void toku_env_set_errpfx(DB_ENV * env, const char *errpfx) {
static int toku_env_set_flags(DB_ENV * env, u_int32_t flags, int onoff) { static int toku_env_set_flags(DB_ENV * env, u_int32_t flags, int onoff) {
HANDLE_PANICKED_ENV(env); HANDLE_PANICKED_ENV(env);
u_int32_t change = 0;
if (flags & DB_AUTO_COMMIT) {
change |= DB_AUTO_COMMIT;
flags &= ~DB_AUTO_COMMIT;
}
if (flags != 0 && onoff) { if (flags != 0 && onoff) {
return do_error(env, EINVAL, "TokuDB does not (yet) support any nonzero ENV flags\n"); return do_error(env, EINVAL, "TokuDB does not (yet) support any nonzero ENV flags other than DB_AUTO_COMMIT\n");
} }
if (onoff) env->i->open_flags |= change;
else env->i->open_flags &= ~change;
return 0; return 0;
} }
...@@ -782,20 +790,21 @@ int db_env_create(DB_ENV ** envp, u_int32_t flags) { ...@@ -782,20 +790,21 @@ int db_env_create(DB_ENV ** envp, u_int32_t flags) {
static int toku_txn_release_locks(DB_TXN* txn) { static int toku_txn_release_locks(DB_TXN* txn) {
assert(txn); assert(txn);
toku_lth* lth = txn->i->lth; toku_lth* lth = txn->i->lth;
assert(lth);
int r; int r = 0;
int r2 = 0; if (lth) {
toku_lth_start_scan(lth); toku_lth_start_scan(lth);
toku_lock_tree* next = toku_lth_next(lth); toku_lock_tree* next = toku_lth_next(lth);
while (next) { int r2;
r = toku_lt_unlock(next, txn); while (next) {
if (r!=0 && !r2) r2 = r; r2 = toku_lt_unlock(next, txn);
next = toku_lth_next(lth); if (r2!=0 && !r) r = r2;
} next = toku_lth_next(lth);
toku_lth_close(lth); }
txn->i->lth = NULL; toku_lth_close(lth);
return r2; txn->i->lth = NULL;
}
return r;
} }
static int toku_txn_commit(DB_TXN * txn, u_int32_t flags) { static int toku_txn_commit(DB_TXN * txn, u_int32_t flags) {
...@@ -864,6 +873,7 @@ static int locked_txn_abort(DB_TXN *txn) { ...@@ -864,6 +873,7 @@ static int locked_txn_abort(DB_TXN *txn) {
static int toku_txn_begin(DB_ENV *env, DB_TXN * stxn, DB_TXN ** txn, u_int32_t flags) { static int toku_txn_begin(DB_ENV *env, DB_TXN * stxn, DB_TXN ** txn, u_int32_t flags) {
HANDLE_PANICKED_ENV(env); HANDLE_PANICKED_ENV(env);
if (!toku_logger_is_open(env->i->logger)) return do_error(env, EINVAL, "Environment does not have logging enabled\n"); if (!toku_logger_is_open(env->i->logger)) return do_error(env, EINVAL, "Environment does not have logging enabled\n");
if (!(env->i->open_flags & DB_INIT_TXN)) return do_error(env, EINVAL, "Environment does not have transactions enabled\n");
flags=flags; flags=flags;
DB_TXN *MALLOC(result); DB_TXN *MALLOC(result);
if (result == 0) if (result == 0)
...@@ -880,12 +890,16 @@ static int toku_txn_begin(DB_ENV *env, DB_TXN * stxn, DB_TXN ** txn, u_int32_t f ...@@ -880,12 +890,16 @@ static int toku_txn_begin(DB_ENV *env, DB_TXN * stxn, DB_TXN ** txn, u_int32_t f
return ENOMEM; return ENOMEM;
} }
result->i->parent = stxn; result->i->parent = stxn;
int r = toku_lth_create(&result->i->lth, toku_malloc, toku_free, toku_realloc); int r;
if (r!=0) { if (env->i->open_flags & DB_INIT_LOCK) {
toku_free(result->i); r = toku_lth_create(&result->i->lth,
toku_free(result); toku_malloc, toku_free, toku_realloc);
return r; if (r!=0) {
toku_free(result->i);
toku_free(result);
return r;
}
} }
r = toku_logger_txn_begin(stxn ? stxn->i->tokutxn : 0, &result->i->tokutxn, next_txn++, env->i->logger); r = toku_logger_txn_begin(stxn ? stxn->i->tokutxn : 0, &result->i->tokutxn, next_txn++, env->i->logger);
...@@ -1038,16 +1052,14 @@ static int get_main_cursor_flag(u_int32_t flag) { ...@@ -1038,16 +1052,14 @@ static int get_main_cursor_flag(u_int32_t flag) {
return flag; return flag;
} }
int brt_cursor_not_set(BRT_CURSOR cursor); inline static BOOL toku_c_uninitialized(DBC* c) {
return toku_brt_cursor_uninitialized(c->i->c);
static BOOL toku_c_uninitialized(DBC* c) { }
return brt_cursor_not_set(c->i->c);
}
static int toku_c_get_current_unconditional(DBC* c, DBT* key, DBT* data) { static int toku_c_get_current_unconditional(DBC* c, DBT* key, DBT* data) {
assert(!toku_c_uninitialized(c)); assert(!toku_c_uninitialized(c));
memset(key, 0, sizeof(DBT));
memset(data, 0, sizeof(DBT));
data->flags = key->flags = DB_DBT_MALLOC; data->flags = key->flags = DB_DBT_MALLOC;
TOKUTXN txn = c->i->txn ? c->i->txn->i->tokutxn : NULL; TOKUTXN txn = c->i->txn ? c->i->txn->i->tokutxn : NULL;
int r = toku_brt_cursor_get(c->i->c, key, data, DB_CURRENT_BINDING, txn); int r = toku_brt_cursor_get(c->i->c, key, data, DB_CURRENT_BINDING, txn);
...@@ -1102,7 +1114,6 @@ static int toku_c_get_pre_lock(DBC* c, DBT* key, DBT* data, u_int32_t* flag, ...@@ -1102,7 +1114,6 @@ static int toku_c_get_pre_lock(DBC* c, DBT* key, DBT* data, u_int32_t* flag,
r = toku_save_original_data(saved_key, key); r = toku_save_original_data(saved_key, key);
break; break;
} }
//TODO: #warning "Verify our understanding of DB_GET_BOTH_RANGE IS CORRECT HERE"
case (DB_GET_BOTH_RANGE): { case (DB_GET_BOTH_RANGE): {
if (!duplicates) { if (!duplicates) {
toku_swap_flag(flag, &get_flag, DB_GET_BOTH); goto get_both; } toku_swap_flag(flag, &get_flag, DB_GET_BOTH); goto get_both; }
...@@ -1199,7 +1210,6 @@ static int toku_c_get_post_lock(DBC* c, DBT* key, DBT* data, u_int32_t flag, ...@@ -1199,7 +1210,6 @@ static int toku_c_get_post_lock(DBC* c, DBT* key, DBT* data, u_int32_t flag,
data_r = found ? data : toku_lt_infinity; data_r = found ? data : toku_lt_infinity;
break; break;
} }
//TODO: #warning "Verify our understanding of DB_GET_BOTH_RANGE IS CORRECT HERE"
case (DB_GET_BOTH_RANGE): { case (DB_GET_BOTH_RANGE): {
key_l = key_r = key; key_l = key_r = key;
data_l = saved_data; data_l = saved_data;
...@@ -1272,8 +1282,23 @@ static int toku_c_get_noassociate(DBC * c, DBT * key, DBT * data, u_int32_t flag ...@@ -1272,8 +1282,23 @@ static int toku_c_get_noassociate(DBC * c, DBT * key, DBT * data, u_int32_t flag
} }
static int toku_c_del_noassociate(DBC * c, u_int32_t flags) { static int toku_c_del_noassociate(DBC * c, u_int32_t flags) {
HANDLE_PANICKED_DB(c->dbp); DB* db = c->dbp;
int r = toku_brt_cursor_delete(c->i->c, flags, c->i->txn ? c->i->txn->i->tokutxn : 0); HANDLE_PANICKED_DB(db);
if (toku_c_uninitialized(c)) return EINVAL;
int r;
if (db->i->lt) {
DBT saved_key;
DBT saved_data;
r = toku_c_get_current_unconditional(c, &saved_key, &saved_data);
if (r!=0) return r;
r = toku_lt_acquire_write_lock(db->i->lt, c->i->txn,
&saved_key, &saved_data);
if (saved_key.data) toku_free(saved_key.data);
if (saved_data.data) toku_free(saved_data.data);
if (r!=0) return r;
}
r = toku_brt_cursor_delete(c->i->c, flags, c->i->txn ? c->i->txn->i->tokutxn : 0);
return r; return r;
} }
...@@ -1488,6 +1513,12 @@ static int toku_db_del_noassociate(DB * db, DB_TXN * txn, DBT * key, u_int32_t f ...@@ -1488,6 +1513,12 @@ static int toku_db_del_noassociate(DB * db, DB_TXN * txn, DBT * key, u_int32_t f
toku_free(search_val.data); toku_free(search_val.data);
} }
//Do the actual deleting. //Do the actual deleting.
if (db->i->lt) {
r = toku_lt_acquire_range_write_lock(db->i->lt, txn,
key, toku_lt_neg_infinity,
key, toku_lt_infinity);
if (r!=0) return r;
}
r = toku_brt_delete(db->i->brt, key, txn ? txn->i->tokutxn : 0); r = toku_brt_delete(db->i->brt, key, txn ? txn->i->tokutxn : 0);
return r; return r;
} }
...@@ -2067,6 +2098,7 @@ static int toku_db_put_noassociate(DB * db, DB_TXN * txn, DBT * key, DBT * data, ...@@ -2067,6 +2098,7 @@ static int toku_db_put_noassociate(DB * db, DB_TXN * txn, DBT * key, DBT * data,
r = toku_db_get_noassociate(db, txn, key, toku_init_dbt(&testfordata), 0); r = toku_db_get_noassociate(db, txn, key, toku_init_dbt(&testfordata), 0);
if (r == 0) if (r == 0)
return DB_KEYEXIST; return DB_KEYEXIST;
if (r != DB_NOTFOUND) return r;
} else if (flags != 0) { } else if (flags != 0) {
/* no other flags are currently supported */ /* no other flags are currently supported */
return EINVAL; return EINVAL;
...@@ -2077,6 +2109,7 @@ static int toku_db_put_noassociate(DB * db, DB_TXN * txn, DBT * key, DBT * data, ...@@ -2077,6 +2109,7 @@ static int toku_db_put_noassociate(DB * db, DB_TXN * txn, DBT * key, DBT * data,
r = toku_db_get_noassociate(db, txn, key, data, DB_GET_BOTH); r = toku_db_get_noassociate(db, txn, key, data, DB_GET_BOTH);
if (r == 0) if (r == 0)
return DB_KEYEXIST; return DB_KEYEXIST;
if (r != DB_NOTFOUND) return r;
#else #else
return do_error(db->dbenv, EINVAL, "Tokudb requires that db->put specify DB_YESOVERWRITE or DB_NOOVERWRITE on DB_DUPSORT databases"); return do_error(db->dbenv, EINVAL, "Tokudb requires that db->put specify DB_YESOVERWRITE or DB_NOOVERWRITE on DB_DUPSORT databases");
#endif #endif
...@@ -2244,37 +2277,117 @@ static int toku_db_fd(DB *db, int *fdp) { ...@@ -2244,37 +2277,117 @@ static int toku_db_fd(DB *db, int *fdp) {
#if _THREAD_SAFE #if _THREAD_SAFE
//TODO: DB_AUTO_COMMIT.
//TODO: Nowait only conditionally?
//TODO: NOSYNC change to SYNC if DB_ENV has something in set_flags
inline static int toku_db_construct_autotxn(DB* db, DB_TXN **txn, BOOL* changed,
BOOL force_auto_commit) {
assert(db && txn && changed);
DB_ENV* env = db->dbenv;
if (*txn || !(env->i->open_flags & DB_INIT_TXN)) {
*changed = FALSE;
return 0;
}
BOOL nosync = !force_auto_commit && !(env->i->open_flags & DB_AUTO_COMMIT);
u_int32_t txn_flags = DB_TXN_NOWAIT | (nosync ? DB_TXN_NOSYNC : 0);
int r = toku_txn_begin(env, NULL, txn, txn_flags);
if (r!=0) return r;
*changed = TRUE;
return 0;
}
inline static int toku_db_destruct_autotxn(DB_TXN *txn, int r, BOOL changed) {
if (!changed) return r;
if (r==0) return toku_txn_commit(txn, 0);
toku_txn_abort(txn);
return r;
}
inline static int autotxn_db_associate(DB *primary, DB_TXN *txn, DB *secondary,
int (*callback)(DB *secondary, const DBT *key, const DBT *data, DBT *result), u_int32_t flags) {
BOOL changed; int r;
r = toku_db_construct_autotxn(primary, &txn, &changed, FALSE);
if (r!=0) return r;
r = toku_db_associate(primary, txn, secondary, callback, flags);
return toku_db_destruct_autotxn(txn, r, changed);
}
static int locked_db_associate (DB *primary, DB_TXN *txn, DB *secondary, static int locked_db_associate (DB *primary, DB_TXN *txn, DB *secondary,
int (*callback)(DB *secondary, const DBT *key, const DBT *data, DBT *result), u_int32_t flags) { int (*callback)(DB *secondary, const DBT *key, const DBT *data, DBT *result), u_int32_t flags) {
ydb_lock(); int r = toku_db_associate(primary, txn, secondary, callback, flags); ydb_unlock(); return r; ydb_lock(); int r = autotxn_db_associate(primary, txn, secondary, callback, flags); ydb_unlock(); return r;
} }
static int locked_db_close(DB * db, u_int32_t flags) { static int locked_db_close(DB * db, u_int32_t flags) {
ydb_lock(); int r = toku_db_close(db, flags); ydb_unlock(); return r; ydb_lock(); int r = toku_db_close(db, flags); ydb_unlock(); return r;
} }
//TODO: Something about the cursor with no txn.. EINVAL maybe?
static int locked_db_cursor(DB *db, DB_TXN *txn, DBC **c, u_int32_t flags) { static int locked_db_cursor(DB *db, DB_TXN *txn, DBC **c, u_int32_t flags) {
ydb_lock(); int r = toku_db_cursor(db, txn, c, flags); ydb_unlock(); return r; ydb_lock(); int r = toku_db_cursor(db, txn, c, flags); ydb_unlock(); return r;
} }
inline static int autotxn_db_del(DB* db, DB_TXN* txn, DBT* key,
u_int32_t flags) {
BOOL changed; int r;
r = toku_db_construct_autotxn(db, &txn, &changed, FALSE);
if (r!=0) return r;
r = toku_db_del(db, txn, key, flags);
return toku_db_destruct_autotxn(txn, r, changed);
}
static int locked_db_del(DB * db, DB_TXN * txn, DBT * key, u_int32_t flags) { static int locked_db_del(DB * db, DB_TXN * txn, DBT * key, u_int32_t flags) {
ydb_lock(); int r = toku_db_del(db, txn, key, flags); ydb_unlock(); return r; ydb_lock(); int r = autotxn_db_del(db, txn, key, flags); ydb_unlock(); return r;
}
inline static int autotxn_db_get(DB* db, DB_TXN* txn, DBT* key, DBT* data,
u_int32_t flags) {
BOOL changed; int r;
r = toku_db_construct_autotxn(db, &txn, &changed, FALSE);
if (r!=0) return r;
r = toku_db_get(db, txn, key, data, flags);
return toku_db_destruct_autotxn(txn, r, changed);
} }
static int locked_db_get (DB * db, DB_TXN * txn, DBT * key, DBT * data, u_int32_t flags) { static int locked_db_get (DB * db, DB_TXN * txn, DBT * key, DBT * data, u_int32_t flags) {
ydb_lock(); int r = toku_db_get(db, txn, key, data, flags); ydb_unlock(); return r; ydb_lock(); int r = autotxn_db_get(db, txn, key, data, flags); ydb_unlock(); return r;
}
inline static int autotxn_db_pget(DB* db, DB_TXN* txn, DBT* key, DBT* pkey,
DBT* data, u_int32_t flags) {
BOOL changed; int r;
r = toku_db_construct_autotxn(db, &txn, &changed, FALSE);
if (r!=0) return r;
r = toku_db_pget(db, txn, key, pkey, data, flags);
return toku_db_destruct_autotxn(txn, r, changed);
} }
static int locked_db_pget (DB *db, DB_TXN *txn, DBT *key, DBT *pkey, DBT *data, u_int32_t flags) { static int locked_db_pget (DB *db, DB_TXN *txn, DBT *key, DBT *pkey, DBT *data, u_int32_t flags) {
ydb_lock(); int r = toku_db_pget(db, txn, key, pkey, data, flags); ydb_unlock(); return r; ydb_lock(); int r = autotxn_db_pget(db, txn, key, pkey, data, flags); ydb_unlock(); return r;
}
inline static int autotxn_db_open(DB* db, DB_TXN* txn, const char *fname, const char *dbname, DBTYPE dbtype, u_int32_t flags, int mode) {
BOOL changed; int r;
r = toku_db_construct_autotxn(db, &txn, &changed, flags & DB_AUTO_COMMIT);
if (r!=0) return r;
r = toku_db_open(db, txn, fname, dbname, dbtype, flags & ~DB_AUTO_COMMIT, mode);
return toku_db_destruct_autotxn(txn, r, changed);
} }
static int locked_db_open(DB *db, DB_TXN *txn, const char *fname, const char *dbname, DBTYPE dbtype, u_int32_t flags, int mode) { static int locked_db_open(DB *db, DB_TXN *txn, const char *fname, const char *dbname, DBTYPE dbtype, u_int32_t flags, int mode) {
ydb_lock(); int r = toku_db_open(db, txn, fname, dbname, dbtype, flags, mode); ydb_unlock(); return r; ydb_lock(); int r = toku_db_open(db, txn, fname, dbname, dbtype, flags, mode); ydb_unlock(); return r;
} }
inline static int autotxn_db_put(DB* db, DB_TXN* txn, DBT* key, DBT* data,
u_int32_t flags) {
BOOL changed; int r;
r = toku_db_construct_autotxn(db, &txn, &changed, FALSE);
if (r!=0) return r;
r = toku_db_put(db, txn, key, data, flags);
return toku_db_destruct_autotxn(txn, r, changed);
}
static int locked_db_put(DB * db, DB_TXN * txn, DBT * key, DBT * data, u_int32_t flags) { static int locked_db_put(DB * db, DB_TXN * txn, DBT * key, DBT * data, u_int32_t flags) {
ydb_lock(); int r = toku_db_put(db, txn, key, data, flags); ydb_unlock(); return r; ydb_lock(); int r = autotxn_db_put(db, txn, key, data, flags); ydb_unlock(); return r;
} }
static int locked_db_remove(DB * db, const char *fname, const char *dbname, u_int32_t flags) { static int locked_db_remove(DB * db, const char *fname, const char *dbname, u_int32_t flags) {
......
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