#include <fcntl.h>
#endif
-#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stddef.h>
/** @brief The maximum size of a database page.
*
- * This is 32k, since it must fit in #MDB_page.#mp_upper.
+ * This is 32k, since it must fit in #MDB_page.%mp_upper.
*
* LMDB will use database pages < OS pages if needed.
* That causes more I/O in write transactions: The OS must
#define MDB_TXN_SPILLS 0x08 /**< txn or a parent has spilled pages */
/** @} */
unsigned int mt_flags; /**< @ref mdb_txn */
- /** dirty_list room: Array size - #dirty pages visible to this txn.
+ /** #dirty_list room: Array size - \#dirty pages visible to this txn.
* Includes ancestor txns' dirty pages not hidden by other txns'
* dirty/spilled pages. Thus commit(nested txn) has room to merge
* dirty_list into mt_parent after freeing hidden mt_parent pages.
#define MDB_ENV_ACTIVE 0x20000000U
/** me_txkey is set */
#define MDB_ENV_TXKEY 0x10000000U
- /** Have liveness lock in reader table */
-#define MDB_LIVE_READER 0x08000000U
uint32_t me_flags; /**< @ref mdb_env */
unsigned int me_psize; /**< DB page size, inited from me_os_psize */
unsigned int me_os_psize; /**< OS page size, from #GET_PAGESIZE */
#if !(MDB_MAXKEYSIZE)
unsigned int me_maxkey; /**< max size of a key */
#endif
+ int me_live_reader; /**< have liveness lock in reader table */
#ifdef _WIN32
int me_pidquery; /**< Used in OpenProcess */
HANDLE me_rmutex; /* Windows mutexes don't reside in shared mem */
#define MDB_COMMIT_PAGES IOV_MAX
#endif
- /* max bytes to write in one call */
+ /** max bytes to write in one call */
#define MAX_WRITE (0x80000000U >> (sizeof(ssize_t) == 4))
static int mdb_page_alloc(MDB_cursor *mc, int num, MDB_page **mp);
static MDB_node *mdb_node_search(MDB_cursor *mc, MDB_val *key, int *exactp);
static int mdb_node_add(MDB_cursor *mc, indx_t indx,
MDB_val *key, MDB_val *data, pgno_t pgno, unsigned int flags);
-static void mdb_node_del(MDB_page *mp, indx_t indx, int ksize);
+static void mdb_node_del(MDB_cursor *mc, int ksize);
static void mdb_node_shrink(MDB_page *mp, indx_t indx);
static int mdb_node_move(MDB_cursor *csrc, MDB_cursor *cdst);
static int mdb_node_read(MDB_txn *txn, MDB_node *leaf, MDB_val *data);
mdb_page_dirty(MDB_txn *txn, MDB_page *mp)
{
MDB_ID2 mid;
- int (*insert)(MDB_ID2L, MDB_ID2 *);
+ int rc, (*insert)(MDB_ID2L, MDB_ID2 *);
if (txn->mt_env->me_flags & MDB_WRITEMAP) {
insert = mdb_mid2l_append;
}
mid.mid = mp->mp_pgno;
mid.mptr = mp;
- insert(txn->mt_u.dirty_list, &mid);
+ rc = insert(txn->mt_u.dirty_list, &mid);
+ mdb_tassert(txn, rc == 0);
txn->mt_dirty_room--;
}
return ENOMEM;
mid.mid = pgno;
mid.mptr = np;
- mdb_mid2l_insert(dl, &mid);
+ rc = mdb_mid2l_insert(dl, &mid);
+ mdb_cassert(mc, rc == 0);
} else {
return 0;
}
MDB_PID_T pid = env->me_pid;
pthread_t tid = pthread_self();
- if (!(env->me_flags & MDB_LIVE_READER)) {
+ if (!env->me_live_reader) {
rc = mdb_reader_pid(env, Pidset, pid);
if (rc)
return rc;
- env->me_flags |= MDB_LIVE_READER;
+ env->me_live_reader = 1;
}
LOCK_MUTEX_R(env);
MDB_ID save;
mdb_tassert(txn, len >= 0 && id <= env->me_pglast);
- key.mv_data = &id;
if (len > mop_len) {
len = mop_len;
data.mv_size = (len + 1) * sizeof(MDB_ID);
+ /* Drop MDB_CURRENT when changing the data size */
+ key.mv_data = &id;
flags = 0;
}
data.mv_data = mop -= len;
env->me_mapsize = minsize;
}
- rc = mdb_env_map(env, meta.mm_address, newenv);
+ rc = mdb_env_map(env, meta.mm_address, newenv || env->me_mapsize != meta.mm_mapsize);
if (rc)
return rc;
MDB_node *leaf = NULL;
DKBUF;
- assert(mc);
- mdb_cassert(mc, key);
if (key->mv_size == 0)
return MDB_BAD_VALSIZE;
unsigned int flags)
{
enum { MDB_NO_ROOT = MDB_LAST_ERRCODE+10 }; /* internal code */
- MDB_env *env = mc->mc_txn->mt_env;
+ MDB_env *env;
MDB_node *leaf = NULL;
MDB_page *fp, *mp;
uint16_t fp_flags;
unsigned int nflags;
DKBUF;
+ if (mc == NULL)
+ return EINVAL;
+
+ env = mc->mc_txn->mt_env;
+
/* Check this first so counter will always be zero on any
* early failures.
*/
if (mc->mc_txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR))
return (mc->mc_txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN;
- if (flags != MDB_CURRENT && key->mv_size-1 >= ENV_MAXKEY(env))
- return MDB_BAD_VALSIZE;
+ if (flags != MDB_CURRENT) {
+ if (key == NULL)
+ return EINVAL;
+ if (key->mv_size-1 >= ENV_MAXKEY(env))
+ return MDB_BAD_VALSIZE;
+ } else {
+ /* Ignore key except in sub-cursor, where key holds the data */
+ if (!(mc->mc_flags & C_SUB))
+ key = NULL;
+ }
#if SIZE_MAX > MAXDATASIZE
if (data->mv_size > ((mc->mc_db->md_flags & MDB_DUPSORT) ? ENV_MAXKEY(env) : MAXDATASIZE))
* it. mp: new (sub-)page. offset: growth in page
* size. xdata: node data with new page or DB.
*/
- ssize_t i, offset = 0;
+ unsigned i, offset = 0;
mp = fp = xdata.mv_data = env->me_pbuf;
mp->mp_pgno = mc->mc_pg[mc->mc_top]->mp_pgno;
fp = olddata.mv_data;
switch (flags) {
default:
- i = -(ssize_t)SIZELEFT(fp);
if (!(mc->mc_db->md_flags & MDB_DUPFIXED)) {
- offset = i += (ssize_t) EVEN(
- sizeof(indx_t) + NODESIZE + data->mv_size);
- } else {
- i += offset = fp->mp_pad;
- offset *= 4; /* space for 4 more */
+ offset = EVEN(NODESIZE + sizeof(indx_t) +
+ data->mv_size);
+ break;
}
- if (i > 0)
+ offset = fp->mp_pad;
+ if (SIZELEFT(fp) < offset) {
+ offset *= 4; /* space for 4 more */
break;
- /* FALLTHRU: Sub-page is big enough */
+ }
+ /* FALLTHRU: Big enough MDB_DUPFIXED sub-page */
case MDB_CURRENT:
fp->mp_flags |= P_DIRTY;
COPY_PGNO(fp->mp_pgno, mp->mp_pgno);
} else {
memcpy((char *)mp + mp->mp_upper, (char *)fp + fp->mp_upper,
olddata.mv_size - fp->mp_upper);
- for (i = NUMKEYS(fp); --i >= 0; )
+ for (i=0; i<NUMKEYS(fp); i++)
mp->mp_ptrs[i] = fp->mp_ptrs[i] + offset;
}
}
flags |= F_DUPDATA;
do_sub = 1;
if (!insert)
- mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
+ mdb_node_del(mc, 0);
goto new_sub;
}
current:
return ENOMEM;
id2.mid = pg;
id2.mptr = np;
- mdb_mid2l_insert(mc->mc_txn->mt_u.dirty_list, &id2);
+ rc = mdb_mid2l_insert(mc->mc_txn->mt_u.dirty_list, &id2);
+ mdb_cassert(mc, rc == 0);
if (!(flags & MDB_RESERVE)) {
/* Copy end of page, adjusting alignment so
* compiler may copy words instead of bytes.
*/
if (F_ISSET(flags, MDB_RESERVE))
data->mv_data = olddata.mv_data;
- else if (data->mv_size)
+ else if (!(mc->mc_flags & C_SUB))
memcpy(olddata.mv_data, data->mv_data, data->mv_size);
else
memcpy(NODEKEY(leaf), key->mv_data, key->mv_size);
goto done;
}
- mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
+ mdb_node_del(mc, 0);
mc->mc_db->md_entries--;
}
}
/** Delete the specified node from a page.
- * @param[in] mp The page to operate on.
- * @param[in] indx The index of the node to delete.
+ * @param[in] mc Cursor pointing to the node to delete.
* @param[in] ksize The size of a node. Only used if the page is
* part of a #MDB_DUPFIXED database.
*/
static void
-mdb_node_del(MDB_page *mp, indx_t indx, int ksize)
+mdb_node_del(MDB_cursor *mc, int ksize)
{
+ MDB_page *mp = mc->mc_pg[mc->mc_top];
+ indx_t indx = mc->mc_ki[mc->mc_top];
unsigned int sz;
indx_t i, j, numkeys, ptr;
MDB_node *node;
DPRINTF(("delete node %u on %s page %"Z"u", indx,
IS_LEAF(mp) ? "leaf" : "branch", mdb_dbg_pgno(mp)));
- assert(indx < NUMKEYS(mp));
+ numkeys = NUMKEYS(mp);
+ mdb_cassert(mc, indx < numkeys);
if (IS_LEAF2(mp)) {
- int x = NUMKEYS(mp) - 1 - indx;
+ int x = numkeys - 1 - indx;
base = LEAF2KEY(mp, indx, ksize);
if (x)
memmove(base, base + ksize, x * ksize);
sz = EVEN(sz);
ptr = mp->mp_ptrs[indx];
- numkeys = NUMKEYS(mp);
for (i = j = 0; i < numkeys; i++) {
if (i != indx) {
mp->mp_ptrs[j] = mp->mp_ptrs[i];
MDB_dbi
mdb_cursor_dbi(MDB_cursor *mc)
{
- assert(mc != NULL);
return mc->mc_dbi;
}
/* not enough space left, do a delete and split */
DPRINTF(("Not enough room, delta = %d, splitting...", delta));
pgno = NODEPGNO(node);
- mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
+ mdb_node_del(mc, 0);
return mdb_page_split(mc, key, NULL, pgno, MDB_SPLIT_REPLACE);
}
/* Delete the node from the source page.
*/
- mdb_node_del(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top], key.mv_size);
+ mdb_node_del(csrc, key.mv_size);
{
/* Adjust other cursors pointing to mp */
* the \b csrc page will be freed.
* @param[in] csrc Cursor pointing to the source page.
* @param[in] cdst Cursor pointing to the destination page.
+ * @return 0 on success, non-zero on failure.
*/
static int
mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst)
/* Unlink the src page from parent and add to free list.
*/
- mdb_node_del(csrc->mc_pg[csrc->mc_top-1], csrc->mc_ki[csrc->mc_top-1], 0);
- if (csrc->mc_ki[csrc->mc_top-1] == 0) {
+ csrc->mc_top--;
+ mdb_node_del(csrc, 0);
+ if (csrc->mc_ki[csrc->mc_top] == 0) {
key.mv_size = 0;
- csrc->mc_top--;
rc = mdb_update_key(csrc, &key);
- csrc->mc_top++;
- if (rc)
+ if (rc) {
+ csrc->mc_top++;
return rc;
+ }
}
+ csrc->mc_top++;
rc = mdb_midl_append(&csrc->mc_txn->mt_free_pgs,
csrc->mc_pg[csrc->mc_top]->mp_pgno);
(rc = mdb_ovpage_free(mc, omp)))
return rc;
}
- mdb_node_del(mp, ki, mc->mc_db->md_pad);
+ mdb_node_del(mc, mc->mc_db->md_pad);
mc->mc_db->md_entries--;
rc = mdb_rebalance(mc);
if (rc != MDB_SUCCESS)
mc->mc_ki[i] = mn.mc_ki[i];
}
mc->mc_pg[ptop] = mn.mc_pg[ptop];
- mc->mc_ki[ptop] = mn.mc_ki[ptop] - 1;
+ if (mn.mc_ki[ptop]) {
+ mc->mc_ki[ptop] = mn.mc_ki[ptop] - 1;
+ } else {
+ /* find right page's left sibling */
+ mc->mc_ki[ptop] = mn.mc_ki[ptop];
+ mdb_cursor_sibling(mc, 0);
+ }
}
} else {
mn.mc_top--;
*/
if (mn.mc_pg[ptop] != mc->mc_pg[ptop] &&
mc->mc_ki[ptop] >= NUMKEYS(mc->mc_pg[ptop])) {
- for (i=0; i<ptop; i++) {
+ for (i=0; i<=ptop; i++) {
mc->mc_pg[i] = mn.mc_pg[i];
mc->mc_ki[i] = mn.mc_ki[i];
}
- mc->mc_pg[ptop] = mn.mc_pg[ptop];
- mc->mc_ki[ptop] = mn.mc_ki[ptop] - 1;
}
}
/* return tmp page to freelist */
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