* BerkeleyDB API, but much simplified.
*/
/*
- * Copyright 2011 Howard Chu, Symas Corp.
+ * Copyright 2011-2012 Howard Chu, Symas Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#include <assert.h>
#include <errno.h>
+#include <limits.h>
#include <stddef.h>
-#include <stdint.h>
+#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
+#if !(defined(BYTE_ORDER) || defined(__BYTE_ORDER))
+#include <resolv.h> /* defines BYTE_ORDER on HPUX and Solaris */
+#endif
+
#ifndef _WIN32
#include <pthread.h>
+#ifdef __APPLE__
+#include <semaphore.h>
+#endif
+#endif
+
+#ifdef USE_VALGRIND
+#include <valgrind/memcheck.h>
+#define VGMEMP_CREATE(h,r,z) VALGRIND_CREATE_MEMPOOL(h,r,z)
+#define VGMEMP_ALLOC(h,a,s) VALGRIND_MEMPOOL_ALLOC(h,a,s)
+#define VGMEMP_FREE(h,a) VALGRIND_MEMPOOL_FREE(h,a)
+#define VGMEMP_DESTROY(h) VALGRIND_DESTROY_MEMPOOL(h)
+#define VGMEMP_DEFINED(a,s) VALGRIND_MAKE_MEM_DEFINED(a,s)
+#else
+#define VGMEMP_CREATE(h,r,z)
+#define VGMEMP_ALLOC(h,a,s)
+#define VGMEMP_FREE(h,a)
+#define VGMEMP_DESTROY(h)
+#define VGMEMP_DEFINED(a,s)
+#endif
+
+#ifndef BYTE_ORDER
+# if (defined(_LITTLE_ENDIAN) || defined(_BIG_ENDIAN)) && !(defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN))
+/* Solaris just defines one or the other */
+# define LITTLE_ENDIAN 1234
+# define BIG_ENDIAN 4321
+# ifdef _LITTLE_ENDIAN
+# define BYTE_ORDER LITTLE_ENDIAN
+# else
+# define BYTE_ORDER BIG_ENDIAN
+# endif
+# else
+# define BYTE_ORDER __BYTE_ORDER
+# endif
+#endif
+
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#endif
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN __BIG_ENDIAN
+#endif
+
+#if defined(__i386) || defined(__x86_64)
+#define MISALIGNED_OK 1
#endif
#include "mdb.h"
#include "midl.h"
+#if (BYTE_ORDER == LITTLE_ENDIAN) == (BYTE_ORDER == BIG_ENDIAN)
+# error "Unknown or unsupported endianness (BYTE_ORDER)"
+#elif (-6 & 5) || CHAR_BIT != 8 || UINT_MAX < 0xffffffff || ULONG_MAX % 0xFFFF
+# error "Two's complement, reasonably sized integer types, please"
+#endif
+
/** @defgroup internal MDB Internals
* @{
*/
#define close(fd) CloseHandle(fd)
#define munmap(ptr,len) UnmapViewOfFile(ptr)
#else
+#ifdef __APPLE__
+#define LOCK_MUTEX_R(env) sem_wait((env)->me_rmutex)
+#define UNLOCK_MUTEX_R(env) sem_post((env)->me_rmutex)
+#define LOCK_MUTEX_W(env) sem_wait((env)->me_wmutex)
+#define UNLOCK_MUTEX_W(env) sem_post((env)->me_wmutex)
+#define fdatasync(fd) fsync(fd)
+#else
+#ifdef ANDROID
+#define fdatasync(fd) fsync(fd)
+#endif
/** Lock the reader mutex.
*/
#define LOCK_MUTEX_R(env) pthread_mutex_lock(&(env)->me_txns->mti_mutex)
/** Unlock the writer mutex.
*/
#define UNLOCK_MUTEX_W(env) pthread_mutex_unlock(&(env)->me_txns->mti_wmutex)
+#endif /* __APPLE__ */
/** Get the error code for the last failed system function.
*/
#define GET_PAGESIZE(x) ((x) = sysconf(_SC_PAGE_SIZE))
#endif
+#if defined(_WIN32) || defined(__APPLE__)
+#define MNAME_LEN 32
+#else
+#define MNAME_LEN (sizeof(pthread_mutex_t))
+#endif
+
/** @} */
#ifndef _WIN32
#ifndef MDB_DSYNC
# define MDB_DSYNC O_DSYNC
#endif
+#endif
+
+/** Function for flushing the data of a file. Define this to fsync
+ * if fdatasync() is not supported.
+ */
+#ifndef MDB_FDATASYNC
+# define MDB_FDATASYNC fdatasync
#endif
/** A page number in the database.
* @note In the #MDB_node structure, we only store 48 bits of this value,
* which thus limits us to only 60 bits of addressable data.
*/
-typedef ULONG pgno_t;
+typedef ID pgno_t;
+
+ /** A transaction ID.
+ * See struct MDB_txn.mt_txnid for details.
+ */
+typedef ID txnid_t;
/** @defgroup debug Debug Macros
* @{
*/
-#ifndef DEBUG
+#ifndef MDB_DEBUG
/** Enable debug output.
* Set this to 1 for copious tracing. Set to 2 to add dumps of all IDLs
* read from and written to the database (used for free space management).
*/
-#define DEBUG 0
+#define MDB_DEBUG 0
#endif
#if !(__STDC_VERSION__ >= 199901L || defined(__GNUC__))
# define DPRINTF (void) /* Vararg macros may be unsupported */
-#elif DEBUG
+#elif MDB_DEBUG
/** Print a debug message with printf formatting. */
# define DPRINTF(fmt, ...) /**< Requires 2 or more args */ \
- fprintf(stderr, "%s:%d:(%p) " fmt "\n", __func__, __LINE__, pthread_self(), __VA_ARGS__)
+ fprintf(stderr, "%s:%d " fmt "\n", __func__, __LINE__, __VA_ARGS__)
#else
# define DPRINTF(fmt, ...) ((void) 0)
#endif
* pressure from other processes is high. So until OSs have
* actual paging support for Huge pages, they're not viable.
*/
-#define PAGESIZE 4096
+#define MDB_PAGESIZE 4096
/** The minimum number of keys required in a database page.
* Setting this to a larger value will place a smaller bound on the
/** The maximum size of a key in the database.
* While data items have essentially unbounded size, we require that
* keys all fit onto a regular page. This limit could be raised a bit
- * further if needed; to something just under #PAGESIZE / #MDB_MINKEYS.
+ * further if needed; to something just under #MDB_PAGESIZE / #MDB_MINKEYS.
*/
#define MAXKEYSIZE 511
-#if DEBUG
+#if MDB_DEBUG
/** A key buffer.
* @ingroup debug
* This is used for printing a hex dump of a key's contents.
#define DKEY(x) mdb_dkey(x, kbuf)
#else
#define DKBUF typedef int dummy_kbuf /* so we can put ';' after */
-#define DKEY(x)
+#define DKEY(x) 0
#endif
/** @defgroup lazylock Lazy Locking
- * Macros for locks that are't actually needed.
+ * Macros for locks that aren't actually needed.
* The DB view is always consistent because all writes are wrapped in
* the wmutex. Finer-grained locks aren't necessary.
* @{
#define LAZY_RWLOCK_UNLOCK(x) pthread_rwlock_unlock(x)
#define LAZY_RWLOCK_WRLOCK(x) pthread_rwlock_wrlock(x)
#define LAZY_RWLOCK_RDLOCK(x) pthread_rwlock_rdlock(x)
-#define LAZY_RWLOCK_DEF(x) pthread_rwlock_t x
+#define LAZY_RWLOCK_DEF(x) pthread_rwlock_t x;
#define LAZY_RWLOCK_INIT(x,y) pthread_rwlock_init(x,y)
#define LAZY_RWLOCK_DESTROY(x) pthread_rwlock_destroy(x)
#endif
* started from so we can avoid overwriting any data used in that
* particular version.
*/
- ULONG mrb_txnid;
+ txnid_t mrb_txnid;
/** The process ID of the process owning this reader txn. */
pid_t mrb_pid;
/** The thread ID of the thread owning this txn. */
* For POSIX the actual mutexes reside in the shared memory of this
* mapped file. On Windows, mutexes are named objects allocated by the
* kernel; we store the mutex names in this mapped file so that other
- * processes can grab them. This same approach will also be used on
+ * processes can grab them. This same approach is also used on
* MacOSX/Darwin (using named semaphores) since MacOSX doesn't support
- * process-shared POSIX mutexes.
+ * process-shared POSIX mutexes. For these cases where a named object
+ * is used, the object name is derived from a 64 bit FNV hash of the
+ * environment pathname. As such, naming collisions are extremely
+ * unlikely. If a collision occurs, the results are unpredictable.
*/
typedef struct MDB_txbody {
- /** Stamp identifying this as an MDB lock file. It must be set
+ /** Stamp identifying this as an MDB file. It must be set
* to #MDB_MAGIC. */
uint32_t mtb_magic;
/** Version number of this lock file. Must be set to #MDB_VERSION. */
uint32_t mtb_version;
-#ifdef _WIN32
- char mtb_rmname[32];
+#if defined(_WIN32) || defined(__APPLE__)
+ char mtb_rmname[MNAME_LEN];
#else
/** Mutex protecting access to this table.
* This is the reader lock that #LOCK_MUTEX_R acquires.
* This is recorded here only for convenience; the value can always
* be determined by reading the main database meta pages.
*/
- ULONG mtb_txnid;
+ txnid_t mtb_txnid;
/** The number of slots that have been used in the reader table.
* This always records the maximum count, it is not decremented
* when readers release their slots.
*/
- uint32_t mtb_numreaders;
+ unsigned mtb_numreaders;
/** The ID of the most recent meta page in the database.
* This is recorded here only for convenience; the value can always
* be determined by reading the main database meta pages.
char pad[(sizeof(MDB_txbody)+CACHELINE-1) & ~(CACHELINE-1)];
} mt1;
union {
-#ifdef _WIN32
- char mt2_wmname[32];
+#if defined(_WIN32) || defined(__APPLE__)
+ char mt2_wmname[MNAME_LEN];
#define mti_wmname mt2.mt2_wmname
#else
pthread_mutex_t mt2_wmutex;
#define mti_wmutex mt2.mt2_wmutex
#endif
- char pad[(sizeof(pthread_mutex_t)+CACHELINE-1) & ~(CACHELINE-1)];
+ char pad[(MNAME_LEN+CACHELINE-1) & ~(CACHELINE-1)];
} mt2;
MDB_reader mti_readers[1];
} MDB_txninfo;
/** @} */
/** Common header for all page types.
- * Overflow pages occupy a number of contiguous pages with no
+ * Overflow records occupy a number of contiguous pages with no
* headers on any page after the first.
*/
typedef struct MDB_page {
#define mp_pgno mp_p.p_pgno
#define mp_next mp_p.p_next
- union padded {
+ union {
pgno_t p_pgno; /**< page number */
void * p_next; /**< for in-memory list of freed structs */
} mp_p;
+ uint16_t mp_pad;
+/** @defgroup mdb_page Page Flags
+ * @ingroup internal
+ * Flags for the page headers.
+ * @{
+ */
#define P_BRANCH 0x01 /**< branch page */
#define P_LEAF 0x02 /**< leaf page */
#define P_OVERFLOW 0x04 /**< overflow page */
#define P_META 0x08 /**< meta page */
#define P_DIRTY 0x10 /**< dirty page */
#define P_LEAF2 0x20 /**< for #MDB_DUPFIXED records */
- uint32_t mp_flags;
+#define P_SUBP 0x40 /**< for #MDB_DUPSORT sub-pages */
+/** @} */
+ uint16_t mp_flags; /**< @ref mdb_page */
#define mp_lower mp_pb.pb.pb_lower
#define mp_upper mp_pb.pb.pb_upper
#define mp_pages mp_pb.pb_pages
- union page_bounds {
+ union {
struct {
indx_t pb_lower; /**< lower bound of free space */
indx_t pb_upper; /**< upper bound of free space */
#define IS_BRANCH(p) F_ISSET((p)->mp_flags, P_BRANCH)
/** Test if a page is an overflow page */
#define IS_OVERFLOW(p) F_ISSET((p)->mp_flags, P_OVERFLOW)
+ /** Test if a page is a sub page */
+#define IS_SUBP(p) F_ISSET((p)->mp_flags, P_SUBP)
/** The number of overflow pages needed to store the given size. */
#define OVPAGES(size, psize) ((PAGEHDRSZ-1 + (size)) / (psize) + 1)
typedef struct MDB_node {
/** lo and hi are used for data size on leaf nodes and for
* child pgno on branch nodes. On 64 bit platforms, flags
- * is also used for pgno. (branch nodes ignore flags)
+ * is also used for pgno. (Branch nodes have no flags).
+ * They are in host byte order in case that lets some
+ * accesses be optimized into a 32-bit word access.
*/
- unsigned short mn_lo;
- unsigned short mn_hi; /**< part of dsize or pgno */
- unsigned short mn_flags; /**< flags for special node types */
+#define mn_lo mn_offset[BYTE_ORDER!=LITTLE_ENDIAN]
+#define mn_hi mn_offset[BYTE_ORDER==LITTLE_ENDIAN] /**< part of dsize or pgno */
+ unsigned short mn_offset[2]; /**< storage for #mn_lo and #mn_hi */
+/** @defgroup mdb_node Node Flags
+ * @ingroup internal
+ * Flags for node headers.
+ * @{
+ */
#define F_BIGDATA 0x01 /**< data put on overflow page */
#define F_SUBDATA 0x02 /**< data is a sub-database */
#define F_DUPDATA 0x04 /**< data has duplicates */
+
+/** valid flags for #mdb_node_add() */
+#define NODE_ADD_FLAGS (F_DUPDATA|F_SUBDATA|MDB_RESERVE|MDB_APPEND)
+
+/** @} */
+ unsigned short mn_flags; /**< @ref mdb_node */
unsigned short mn_ksize; /**< key size */
char mn_data[1]; /**< key and data are appended here */
} MDB_node;
/** Size of the node header, excluding dynamic data at the end */
#define NODESIZE offsetof(MDB_node, mn_data)
+ /** Bit position of top word in page number, for shifting mn_flags */
+#define PGNO_TOPWORD ((pgno_t)-1 > 0xffffffffu ? 32 : 0)
+
/** Size of a node in a branch page with a given key.
* This is just the node header plus the key, there is no data.
*/
#define NODEDATA(node) (void *)((char *)(node)->mn_data + (node)->mn_ksize)
/** Get the page number pointed to by a branch node */
-#if LONG_MAX == 0x7fffffff
-#define NODEPGNO(node) ((node)->mn_lo | ((node)->mn_hi << 16))
- /** Set the page number in a branch node */
-#define SETPGNO(node,pgno) do { \
- (node)->mn_lo = (pgno) & 0xffff; (node)->mn_hi = (pgno) >> 16;} while(0)
-#else
-#define NODEPGNO(node) ((node)->mn_lo | ((node)->mn_hi << 16) | ((unsigned long)(node)->mn_flags << 32))
+#define NODEPGNO(node) \
+ ((node)->mn_lo | ((pgno_t) (node)->mn_hi << 16) | \
+ (PGNO_TOPWORD ? ((pgno_t) (node)->mn_flags << PGNO_TOPWORD) : 0))
/** Set the page number in a branch node */
#define SETPGNO(node,pgno) do { \
(node)->mn_lo = (pgno) & 0xffff; (node)->mn_hi = (pgno) >> 16; \
- (node)->mn_flags = (pgno) >> 32; } while(0)
-#endif
+ if (PGNO_TOPWORD) (node)->mn_flags = (pgno) >> PGNO_TOPWORD; } while(0)
/** Get the size of the data in a leaf node */
#define NODEDSZ(node) ((node)->mn_lo | ((unsigned)(node)->mn_hi << 16))
/** The size of a key in a node */
#define NODEKSZ(node) ((node)->mn_ksize)
+ /** Copy a page number from src to dst */
+#ifdef MISALIGNED_OK
+#define COPY_PGNO(dst,src) dst = src
+#else
+#if SIZE_MAX > 4294967295UL
+#define COPY_PGNO(dst,src) do { \
+ unsigned short *s, *d; \
+ s = (unsigned short *)&(src); \
+ d = (unsigned short *)&(dst); \
+ *d++ = *s++; \
+ *d++ = *s++; \
+ *d++ = *s++; \
+ *d = *s; \
+} while (0)
+#else
+#define COPY_PGNO(dst,src) do { \
+ unsigned short *s, *d; \
+ s = (unsigned short *)&(src); \
+ d = (unsigned short *)&(dst); \
+ *d++ = *s++; \
+ *d = *s; \
+} while (0)
+#endif
+#endif
/** The address of a key in a LEAF2 page.
* LEAF2 pages are used for #MDB_DUPFIXED sorted-duplicate sub-DBs.
* There are no node headers, keys are stored contiguously.
uint32_t md_pad; /**< also ksize for LEAF2 pages */
uint16_t md_flags; /**< @ref mdb_open */
uint16_t md_depth; /**< depth of this tree */
- ULONG md_branch_pages; /**< number of internal pages */
- ULONG md_leaf_pages; /**< number of leaf pages */
- ULONG md_overflow_pages; /**< number of overflow pages */
- ULONG md_entries; /**< number of data items */
+ pgno_t md_branch_pages; /**< number of internal pages */
+ pgno_t md_leaf_pages; /**< number of leaf pages */
+ pgno_t md_overflow_pages; /**< number of overflow pages */
+ size_t md_entries; /**< number of data items */
pgno_t md_root; /**< the root page of this tree */
} MDB_db;
/** Meta page content. */
typedef struct MDB_meta {
- /** Stamp identifying this as an MDB data file. It must be set
+ /** Stamp identifying this as an MDB file. It must be set
* to #MDB_MAGIC. */
uint32_t mm_magic;
/** Version number of this lock file. Must be set to #MDB_VERSION. */
/** Any persistent environment flags. @ref mdb_env */
#define mm_flags mm_dbs[0].md_flags
pgno_t mm_last_pg; /**< last used page in file */
- ULONG mm_txnid; /**< txnid that committed this page */
+ txnid_t mm_txnid; /**< txnid that committed this page */
} MDB_meta;
+ /** Buffer for a stack-allocated dirty page.
+ * The members define size and alignment, and silence type
+ * aliasing warnings. They are not used directly; that could
+ * mean incorrectly using several union members in parallel.
+ */
+typedef union MDB_pagebuf {
+ char mb_raw[MDB_PAGESIZE];
+ MDB_page mb_page;
+ struct {
+ char mm_pad[PAGEHDRSZ];
+ MDB_meta mm_meta;
+ } mb_metabuf;
+} MDB_pagebuf;
+
/** Auxiliary DB info.
* The information here is mostly static/read-only. There is
* only a single copy of this record in the environment.
- * The \b md_dirty flag is not read-only, but only a write
- * transaction can ever update it, and only write transactions
- * need to worry about it.
*/
typedef struct MDB_dbx {
MDB_val md_name; /**< name of the database */
MDB_cmp_func *md_cmp; /**< function for comparing keys */
MDB_cmp_func *md_dcmp; /**< function for comparing data items */
MDB_rel_func *md_rel; /**< user relocate function */
- MDB_dbi md_parent; /**< parent DB of a sub-DB */
- unsigned int md_dirty; /**< TRUE if DB was written in this txn */
+ void *md_relctx; /**< user-provided context for md_rel */
} MDB_dbx;
/** A database transaction.
* Every operation requires a transaction handle.
*/
struct MDB_txn {
+ MDB_txn *mt_parent; /**< parent of a nested txn */
+ MDB_txn *mt_child; /**< nested txn under this txn */
pgno_t mt_next_pgno; /**< next unallocated page */
/** The ID of this transaction. IDs are integers incrementing from 1.
* Only committed write transactions increment the ID. If a transaction
* aborts, the ID may be re-used by the next writer.
*/
- ULONG mt_txnid;
+ txnid_t mt_txnid;
MDB_env *mt_env; /**< the DB environment */
/** The list of pages that became unused during this transaction.
- * This is an #IDL.
*/
- pgno_t *mt_free_pgs;
+ IDL mt_free_pgs;
union {
ID2L dirty_list; /**< modified pages */
MDB_reader *reader; /**< this thread's slot in the reader table */
MDB_dbx *mt_dbxs;
/** Array of MDB_db records for each known DB */
MDB_db *mt_dbs;
+/** @defgroup mt_dbflag Transaction DB Flags
+ * @ingroup internal
+ * @{
+ */
+#define DB_DIRTY 0x01 /**< DB was written in this txn */
+#define DB_STALE 0x02 /**< DB record is older than txnID */
+/** @} */
+ /** Array of cursors for each DB */
+ MDB_cursor **mt_cursors;
+ /** Array of flags for each DB */
+ unsigned char *mt_dbflags;
/** Number of DB records in use. This number only ever increments;
* we don't decrement it when individual DB handles are closed.
*/
- unsigned int mt_numdbs;
+ MDB_dbi mt_numdbs;
+/** @defgroup mdb_txn Transaction Flags
+ * @ingroup internal
+ * @{
+ */
#define MDB_TXN_RDONLY 0x01 /**< read-only transaction */
#define MDB_TXN_ERROR 0x02 /**< an error has occurred */
- unsigned int mt_flags;
+/** @} */
+ unsigned int mt_flags; /**< @ref mdb_txn */
/** Tracks which of the two meta pages was used at the start
* of this transaction.
*/
/** Cursors are used for all DB operations */
struct MDB_cursor {
+ /** Next cursor on this DB in this txn */
+ MDB_cursor *mc_next;
+ /** Original cursor if this is a shadow */
+ MDB_cursor *mc_orig;
/** Context used for databases with #MDB_DUPSORT, otherwise NULL */
struct MDB_xcursor *mc_xcursor;
/** The transaction that owns this cursor */
MDB_txn *mc_txn;
/** The database handle this cursor operates on */
MDB_dbi mc_dbi;
+ /** The database record for this cursor */
+ MDB_db *mc_db;
+ /** The database auxiliary record for this cursor */
+ MDB_dbx *mc_dbx;
+ /** The @ref mt_dbflag for this database */
+ unsigned char *mc_dbflag;
unsigned short mc_snum; /**< number of pushed pages */
- unsigned short mc_top; /**< index of top page, mc_snum-1 */
- unsigned int mc_flags;
+ unsigned short mc_top; /**< index of top page, normally mc_snum-1 */
+/** @defgroup mdb_cursor Cursor Flags
+ * @ingroup internal
+ * Cursor state flags.
+ * @{
+ */
#define C_INITIALIZED 0x01 /**< cursor has been initialized and is valid */
#define C_EOF 0x02 /**< No more data */
-#define C_XDIRTY 0x04 /**< @deprecated mc_xcursor needs to be flushed */
+#define C_SUB 0x04 /**< Cursor is a sub-cursor */
+#define C_SHADOW 0x08 /**< Cursor is a dup from a parent txn */
+#define C_ALLOCD 0x10 /**< Cursor was malloc'd */
+/** @} */
+ unsigned int mc_flags; /**< @ref mdb_cursor */
MDB_page *mc_pg[CURSOR_STACK]; /**< stack of pushed pages */
indx_t mc_ki[CURSOR_STACK]; /**< stack of page indices */
};
typedef struct MDB_xcursor {
/** A sub-cursor for traversing the Dup DB */
MDB_cursor mx_cursor;
- /** A fake transaction struct for pointing to our own table
- * of DB info.
- */
- MDB_txn mx_txn;
- /** Our private DB information tables. Slots 0 and 1 are always
- * copies of the corresponding slots in the main transaction. These
- * hold the FREEDB and MAINDB, respectively. If the main cursor is
- * on a sub-database, that will be copied to slot 2, and the duplicate
- * database info will be in slot 3. If the main cursor is on the MAINDB
- * then the duplicate DB info will be in slot 2 and slot 3 will be unused.
- */
- MDB_dbx mx_dbxs[4];
- /** MDB_db table */
- MDB_db mx_dbs[4];
+ /** The database record for this Dup DB */
+ MDB_db mx_db;
+ /** The auxiliary DB record for this Dup DB */
+ MDB_dbx mx_dbx;
+ /** The @ref mt_dbflag for this Dup DB */
+ unsigned char mx_dbflag;
} MDB_xcursor;
/** A set of pages freed by an earlier transaction. */
*/
struct MDB_oldpages *mo_next;
/** The ID of the transaction in which these pages were freed. */
- ULONG mo_txnid;
+ txnid_t mo_txnid;
/** An #IDL of the pages */
pgno_t mo_pages[1]; /* dynamic */
} MDB_oldpages;
HANDLE me_mfd; /**< just for writing the meta pages */
/** Failed to update the meta page. Probably an I/O error. */
#define MDB_FATAL_ERROR 0x80000000U
- uint32_t me_flags;
+ uint32_t me_flags; /**< @ref mdb_env */
uint32_t me_extrapad; /**< unused for now */
unsigned int me_maxreaders; /**< size of the reader table */
- unsigned int me_numdbs; /**< number of DBs opened */
- unsigned int me_maxdbs; /**< size of the DB table */
+ MDB_dbi me_numdbs; /**< number of DBs opened */
+ MDB_dbi me_maxdbs; /**< size of the DB table */
char *me_path; /**< path to the DB files */
char *me_map; /**< the memory map of the data file */
MDB_txninfo *me_txns; /**< the memory map of the lock file */
pgno_t me_maxpg; /**< me_mapsize / me_psize */
unsigned int me_psize; /**< size of a page, from #GET_PAGESIZE */
unsigned int me_db_toggle; /**< which DB table is current */
+ txnid_t me_wtxnid; /**< ID of last txn we committed */
+ txnid_t me_pgfirst; /**< ID of first old page record we used */
+ txnid_t me_pglast; /**< ID of last old page record we used */
MDB_dbx *me_dbxs; /**< array of static DB info */
MDB_db *me_dbs[2]; /**< two arrays of MDB_db info */
MDB_oldpages *me_pghead; /**< list of old page records */
pthread_key_t me_txkey; /**< thread-key for readers */
MDB_page *me_dpages; /**< list of malloc'd blocks for re-use */
/** IDL of pages that became unused in a write txn */
- pgno_t me_free_pgs[MDB_IDL_UM_SIZE];
+ IDL me_free_pgs;
/** ID2L of pages that were written during a write txn */
ID2 me_dirty_list[MDB_IDL_UM_SIZE];
/** rwlock for the DB tables, if #LAZY_LOCKS is false */
HANDLE me_rmutex; /* Windows mutexes don't reside in shared mem */
HANDLE me_wmutex;
#endif
+#ifdef __APPLE__
+ sem_t *me_rmutex; /* Apple doesn't support shared mutexes */
+ sem_t *me_wmutex;
+#endif
};
/** max number of pages to commit in one writev() call */
#define MDB_COMMIT_PAGES 64
+#if defined(IOV_MAX) && IOV_MAX < MDB_COMMIT_PAGES
+#undef MDB_COMMIT_PAGES
+#define MDB_COMMIT_PAGES IOV_MAX
+#endif
-static MDB_page *mdb_alloc_page(MDB_cursor *mc, int num);
-static int mdb_touch(MDB_cursor *mc);
+static MDB_page *mdb_page_alloc(MDB_cursor *mc, int num);
+static MDB_page *mdb_page_new(MDB_cursor *mc, uint32_t flags, int num);
+static int mdb_page_touch(MDB_cursor *mc);
-static int mdb_search_page_root(MDB_cursor *mc,
+static int mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **mp);
+static int mdb_page_search_root(MDB_cursor *mc,
MDB_val *key, int modify);
-static int mdb_search_page(MDB_cursor *mc,
+static int mdb_page_search(MDB_cursor *mc,
MDB_val *key, int modify);
+static int mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst);
+static int mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata,
+ pgno_t newpgno, unsigned int nflags);
static int mdb_env_read_header(MDB_env *env, MDB_meta *meta);
static int mdb_env_read_meta(MDB_env *env, int *which);
static int mdb_env_write_meta(MDB_txn *txn);
-static int mdb_get_page(MDB_txn *txn, pgno_t pgno, MDB_page **mp);
-static MDB_node *mdb_search_node(MDB_cursor *mc, MDB_val *key, int *exactp);
-static int mdb_add_node(MDB_cursor *mc, indx_t indx,
- MDB_val *key, MDB_val *data, pgno_t pgno, uint8_t flags);
-static void mdb_del_node(MDB_page *mp, indx_t indx, int ksize);
-static int mdb_del0(MDB_cursor *mc, MDB_node *leaf);
-static int mdb_read_data(MDB_txn *txn, MDB_node *leaf, MDB_val *data);
+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_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);
+static size_t mdb_leaf_size(MDB_env *env, MDB_val *key, MDB_val *data);
+static size_t mdb_branch_size(MDB_env *env, MDB_val *key);
static int mdb_rebalance(MDB_cursor *mc);
static int mdb_update_key(MDB_page *mp, indx_t indx, MDB_val *key);
-static int mdb_move_node(MDB_cursor *csrc, MDB_cursor *cdst);
-static int mdb_merge(MDB_cursor *csrc, MDB_cursor *cdst);
-static int mdb_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata,
- pgno_t newpgno);
-static MDB_page *mdb_new_page(MDB_cursor *mc, uint32_t flags, int num);
-static void cursor_pop_page(MDB_cursor *mc);
-static int cursor_push_page(MDB_cursor *mc, MDB_page *mp);
+static void mdb_cursor_pop(MDB_cursor *mc);
+static int mdb_cursor_push(MDB_cursor *mc, MDB_page *mp);
-static int mdb_sibling(MDB_cursor *mc, int move_right);
+static int mdb_cursor_del0(MDB_cursor *mc, MDB_node *leaf);
+static int mdb_cursor_sibling(MDB_cursor *mc, int move_right);
static int mdb_cursor_next(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op);
static int mdb_cursor_prev(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op);
static int mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op,
static int mdb_cursor_first(MDB_cursor *mc, MDB_val *key, MDB_val *data);
static int mdb_cursor_last(MDB_cursor *mc, MDB_val *key, MDB_val *data);
+static void mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx);
static void mdb_xcursor_init0(MDB_cursor *mc);
static void mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node);
-static void mdb_xcursor_init2(MDB_cursor *mc);
-static void mdb_xcursor_fini(MDB_cursor *mc);
-
-static size_t mdb_leaf_size(MDB_env *env, MDB_val *key, MDB_val *data);
-static size_t mdb_branch_size(MDB_env *env, MDB_val *key);
+static int mdb_drop0(MDB_cursor *mc, int subs);
static void mdb_default_cmp(MDB_txn *txn, MDB_dbi dbi);
/** @cond */
-static MDB_cmp_func memncmp, memnrcmp, intcmp, cintcmp;
+static MDB_cmp_func mdb_cmp_memn, mdb_cmp_memnr, mdb_cmp_int, mdb_cmp_cint, mdb_cmp_long;
/** @endcond */
#ifdef _WIN32
return strerror(err);
}
-#if DEBUG
+#if MDB_DEBUG
/** Display a key in hexadecimal and return the address of the result.
* @param[in] key the key to display
* @param[in] buf the buffer to write into. Should always be #DKBUF.
* printable characters, print it as-is instead of converting to hex.
*/
#if 1
+ buf[0] = '\0';
for (i=0; i<key->mv_size; i++)
ptr += sprintf(ptr, "%02x", *c++);
#else
#endif
return buf;
}
+
+/** Display all the keys in the page. */
+static void
+mdb_page_keys(MDB_page *mp)
+{
+ MDB_node *node;
+ unsigned int i, nkeys;
+ MDB_val key;
+ DKBUF;
+
+ nkeys = NUMKEYS(mp);
+ DPRINTF("numkeys %d", nkeys);
+ for (i=0; i<nkeys; i++) {
+ node = NODEPTR(mp, i);
+ key.mv_size = node->mn_ksize;
+ key.mv_data = node->mn_data;
+ DPRINTF("key %d: %s", i, DKEY(&key));
+ }
+}
+#endif
+
+#if MDB_DEBUG > 2
+/** Count all the pages in each DB and in the freelist
+ * and make sure it matches the actual number of pages
+ * being used.
+ */
+static void mdb_audit(MDB_txn *txn)
+{
+ MDB_cursor mc;
+ MDB_val key, data;
+ int rc, i;
+ ID freecount, count;
+
+ freecount = 0;
+ mdb_cursor_init(&mc, txn, FREE_DBI, NULL);
+ while ((rc = mdb_cursor_get(&mc, &key, &data, MDB_NEXT)) == 0)
+ freecount += *(ID *)data.mv_data;
+ freecount += txn->mt_dbs[0].md_branch_pages + txn->mt_dbs[0].md_leaf_pages +
+ txn->mt_dbs[0].md_overflow_pages;
+
+ count = 0;
+ for (i = 0; i<txn->mt_numdbs; i++) {
+ count += txn->mt_dbs[i].md_branch_pages +
+ txn->mt_dbs[i].md_leaf_pages +
+ txn->mt_dbs[i].md_overflow_pages;
+ if (txn->mt_dbs[i].md_flags & MDB_DUPSORT) {
+ MDB_xcursor mx;
+ mdb_cursor_init(&mc, txn, i, &mx);
+ mdb_page_search(&mc, NULL, 0);
+ do {
+ int j;
+ MDB_page *mp;
+ mp = mc.mc_pg[mc.mc_top];
+ for (j=0; j<NUMKEYS(mp); j++) {
+ MDB_node *leaf = NODEPTR(mp, j);
+ if (leaf->mn_flags & F_SUBDATA) {
+ MDB_db db;
+ memcpy(&db, NODEDATA(leaf), sizeof(db));
+ count += db.md_branch_pages + db.md_leaf_pages +
+ db.md_overflow_pages;
+ }
+ }
+ }
+ while (mdb_cursor_sibling(&mc, 1) == 0);
+ }
+ }
+ assert(freecount + count + 2 >= txn->mt_next_pgno - 1);
+}
#endif
int
return txn->mt_dbxs[dbi].md_cmp(a, b);
}
-/** Compare two data items according to a particular database.
- * This returns a comparison as if the two items were data items of
- * a sorted duplicates #MDB_DUPSORT database.
- * @param[in] txn A transaction handle returned by #mdb_txn_begin()
- * @param[in] dbi A database handle returned by #mdb_open()
- * @param[in] a The first item to compare
- * @param[in] b The second item to compare
- * @return < 0 if a < b, 0 if a == b, > 0 if a > b
- */
int
mdb_dcmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
{
return EINVAL; /* too bad you can't distinguish this from a valid result */
}
+/** Allocate a single page.
+ * Re-use old malloc'd pages first, otherwise just malloc.
+ */
+static MDB_page *
+mdb_page_malloc(MDB_cursor *mc) {
+ MDB_page *ret;
+ size_t sz = mc->mc_txn->mt_env->me_psize;
+ if ((ret = mc->mc_txn->mt_env->me_dpages) != NULL) {
+ VGMEMP_ALLOC(mc->mc_txn->mt_env, ret, sz);
+ VGMEMP_DEFINED(ret, sizeof(ret->mp_next));
+ mc->mc_txn->mt_env->me_dpages = ret->mp_next;
+ } else if ((ret = malloc(sz)) != NULL) {
+ VGMEMP_ALLOC(mc->mc_txn->mt_env, ret, sz);
+ }
+ return ret;
+}
+
/** Allocate pages for writing.
* If there are free pages available from older transactions, they
* will be re-used first. Otherwise a new page will be allocated.
* will always be satisfied by a single contiguous chunk of memory.
*/
static MDB_page *
-mdb_alloc_page(MDB_cursor *mc, int num)
+mdb_page_alloc(MDB_cursor *mc, int num)
{
MDB_txn *txn = mc->mc_txn;
MDB_page *np;
if (txn->mt_txnid > 2) {
- if (!txn->mt_env->me_pghead && mc->mc_dbi != FREE_DBI &&
+ if (!txn->mt_env->me_pghead &&
txn->mt_dbs[FREE_DBI].md_root != P_INVALID) {
/* See if there's anything in the free DB */
MDB_cursor m2;
MDB_node *leaf;
- ULONG *kptr, oldest;
-
- m2.mc_txn = txn;
- m2.mc_dbi = FREE_DBI;
- m2.mc_snum = 0;
- m2.mc_flags = 0;
- mdb_search_page(&m2, NULL, 0);
- leaf = NODEPTR(m2.mc_pg[m2.mc_top], 0);
- kptr = (ULONG *)NODEKEY(leaf);
+ MDB_val data;
+ txnid_t *kptr, oldest, last;
+
+ mdb_cursor_init(&m2, txn, FREE_DBI, NULL);
+ if (!txn->mt_env->me_pgfirst) {
+ mdb_page_search(&m2, NULL, 0);
+ leaf = NODEPTR(m2.mc_pg[m2.mc_top], 0);
+ kptr = (txnid_t *)NODEKEY(leaf);
+ last = *kptr;
+ } else {
+ MDB_val key;
+ int rc, exact;
+again:
+ exact = 0;
+ last = txn->mt_env->me_pglast + 1;
+ leaf = NULL;
+ key.mv_data = &last;
+ key.mv_size = sizeof(last);
+ rc = mdb_cursor_set(&m2, &key, &data, MDB_SET, &exact);
+ if (rc)
+ goto none;
+ last = *(txnid_t *)key.mv_data;
+ }
{
unsigned int i;
oldest = txn->mt_txnid - 1;
for (i=0; i<txn->mt_env->me_txns->mti_numreaders; i++) {
- ULONG mr = txn->mt_env->me_txns->mti_readers[i].mr_txnid;
+ txnid_t mr = txn->mt_env->me_txns->mti_readers[i].mr_txnid;
if (mr && mr < oldest)
oldest = mr;
}
}
- if (oldest > *kptr) {
+ if (oldest > last) {
/* It's usable, grab it.
*/
MDB_oldpages *mop;
- MDB_val data;
pgno_t *idl;
- mdb_read_data(txn, leaf, &data);
- idl = (ULONG *)data.mv_data;
+ if (!txn->mt_env->me_pgfirst) {
+ mdb_node_read(txn, leaf, &data);
+ }
+ txn->mt_env->me_pglast = last;
+ if (!txn->mt_env->me_pgfirst)
+ txn->mt_env->me_pgfirst = last;
+ idl = (ID *) data.mv_data;
+ /* We might have a zero-length IDL due to freelist growth
+ * during a prior commit
+ */
+ if (!idl[0]) goto again;
mop = malloc(sizeof(MDB_oldpages) + MDB_IDL_SIZEOF(idl) - sizeof(pgno_t));
mop->mo_next = txn->mt_env->me_pghead;
- mop->mo_txnid = *kptr;
+ mop->mo_txnid = last;
txn->mt_env->me_pghead = mop;
memcpy(mop->mo_pages, idl, MDB_IDL_SIZEOF(idl));
-#if DEBUG > 1
+#if MDB_DEBUG > 1
{
unsigned int i;
- DPRINTF("IDL read txn %lu root %lu num %lu",
+ DPRINTF("IDL read txn %zu root %zu num %zu",
mop->mo_txnid, txn->mt_dbs[FREE_DBI].md_root, idl[0]);
for (i=0; i<idl[0]; i++) {
- DPRINTF("IDL %lu", idl[i+1]);
+ DPRINTF("IDL %zu", idl[i+1]);
}
}
#endif
- /* drop this IDL from the DB */
- m2.mc_ki[m2.mc_top] = 0;
- m2.mc_flags = C_INITIALIZED;
- mdb_cursor_del(&m2, 0);
}
}
+none:
if (txn->mt_env->me_pghead) {
MDB_oldpages *mop = txn->mt_env->me_pghead;
if (num > 1) {
if (pgno == P_INVALID) {
/* DB size is maxed out */
- if (txn->mt_next_pgno + num >= txn->mt_env->me_maxpg)
+ if (txn->mt_next_pgno + num >= txn->mt_env->me_maxpg) {
+ DPUTS("DB size maxed out");
return NULL;
+ }
}
if (txn->mt_env->me_dpages && num == 1) {
np = txn->mt_env->me_dpages;
+ VGMEMP_ALLOC(txn->mt_env, np, txn->mt_env->me_psize);
+ VGMEMP_DEFINED(np, sizeof(np->mp_next));
txn->mt_env->me_dpages = np->mp_next;
} else {
- if ((np = malloc(txn->mt_env->me_psize * num )) == NULL)
+ size_t sz = txn->mt_env->me_psize * num;
+ if ((np = malloc(sz)) == NULL)
return NULL;
+ VGMEMP_ALLOC(txn->mt_env, np, sz);
}
if (pgno == P_INVALID) {
np->mp_pgno = txn->mt_next_pgno;
* @return 0 on success, non-zero on failure.
*/
static int
-mdb_touch(MDB_cursor *mc)
+mdb_page_touch(MDB_cursor *mc)
{
MDB_page *mp = mc->mc_pg[mc->mc_top];
pgno_t pgno;
if (!F_ISSET(mp->mp_flags, P_DIRTY)) {
MDB_page *np;
- if ((np = mdb_alloc_page(mc, 1)) == NULL)
+ if ((np = mdb_page_alloc(mc, 1)) == NULL)
return ENOMEM;
- DPRINTF("touched db %u page %lu -> %lu", mc->mc_dbi, mp->mp_pgno, np->mp_pgno);
+ DPRINTF("touched db %u page %zu -> %zu", mc->mc_dbi, mp->mp_pgno, np->mp_pgno);
assert(mp->mp_pgno != np->mp_pgno);
- mdb_midl_append(mc->mc_txn->mt_free_pgs, mp->mp_pgno);
+ mdb_midl_append(&mc->mc_txn->mt_free_pgs, mp->mp_pgno);
pgno = np->mp_pgno;
memcpy(np, mp, mc->mc_txn->mt_env->me_psize);
mp = np;
mp->mp_pgno = pgno;
mp->mp_flags |= P_DIRTY;
+finish:
+ /* Adjust other cursors pointing to mp */
+ if (mc->mc_flags & C_SUB) {
+ MDB_cursor *m2, *m3;
+ MDB_dbi dbi = mc->mc_dbi-1;
+
+ for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
+ if (m2 == mc) continue;
+ m3 = &m2->mc_xcursor->mx_cursor;
+ if (m3->mc_snum < mc->mc_snum) continue;
+ if (m3->mc_pg[mc->mc_top] == mc->mc_pg[mc->mc_top]) {
+ m3->mc_pg[mc->mc_top] = mp;
+ }
+ }
+ } else {
+ MDB_cursor *m2;
+
+ for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
+ if (m2 == mc || m2->mc_snum < mc->mc_snum) continue;
+ if (m2->mc_pg[mc->mc_top] == mc->mc_pg[mc->mc_top]) {
+ m2->mc_pg[mc->mc_top] = mp;
+ }
+ }
+ }
mc->mc_pg[mc->mc_top] = mp;
/** If this page has a parent, update the parent to point to
* this new page.
*/
if (mc->mc_top)
SETPGNO(NODEPTR(mc->mc_pg[mc->mc_top-1], mc->mc_ki[mc->mc_top-1]), mp->mp_pgno);
+ else
+ mc->mc_db->md_root = mp->mp_pgno;
+ } else if (mc->mc_txn->mt_parent) {
+ MDB_page *np;
+ ID2 mid;
+ /* If txn has a parent, make sure the page is in our
+ * dirty list.
+ */
+ if (mc->mc_txn->mt_u.dirty_list[0].mid) {
+ unsigned x = mdb_mid2l_search(mc->mc_txn->mt_u.dirty_list, mp->mp_pgno);
+ if (x <= mc->mc_txn->mt_u.dirty_list[0].mid &&
+ mc->mc_txn->mt_u.dirty_list[x].mid == mp->mp_pgno) {
+ if (mc->mc_txn->mt_u.dirty_list[x].mptr != mp) {
+ mp = mc->mc_txn->mt_u.dirty_list[x].mptr;
+ mc->mc_pg[mc->mc_top] = mp;
+ }
+ return 0;
+ }
+ }
+ /* No - copy it */
+ np = mdb_page_malloc(mc);
+ memcpy(np, mp, mc->mc_txn->mt_env->me_psize);
+ mid.mid = np->mp_pgno;
+ mid.mptr = np;
+ mdb_mid2l_insert(mc->mc_txn->mt_u.dirty_list, &mid);
+ mp = np;
+ goto finish;
}
return 0;
}
{
int rc = 0;
if (force || !F_ISSET(env->me_flags, MDB_NOSYNC)) {
- if (fdatasync(env->me_fd))
+ if (MDB_FDATASYNC(env->me_fd))
rc = ErrCode();
}
return rc;
}
-static inline void
+/** Make shadow copies of all of parent txn's cursors */
+static int
+mdb_cursor_shadow(MDB_txn *src, MDB_txn *dst)
+{
+ MDB_cursor *mc, *m2;
+ unsigned int i, j, size;
+
+ for (i=0;i<src->mt_numdbs; i++) {
+ if (src->mt_cursors[i]) {
+ size = sizeof(MDB_cursor);
+ if (src->mt_cursors[i]->mc_xcursor)
+ size += sizeof(MDB_xcursor);
+ for (m2 = src->mt_cursors[i]; m2; m2=m2->mc_next) {
+ mc = malloc(size);
+ if (!mc)
+ return ENOMEM;
+ mc->mc_orig = m2;
+ mc->mc_txn = dst;
+ mc->mc_dbi = i;
+ mc->mc_db = &dst->mt_dbs[i];
+ mc->mc_dbx = m2->mc_dbx;
+ mc->mc_dbflag = &dst->mt_dbflags[i];
+ mc->mc_snum = m2->mc_snum;
+ mc->mc_top = m2->mc_top;
+ mc->mc_flags = m2->mc_flags | C_SHADOW;
+ for (j=0; j<mc->mc_snum; j++) {
+ mc->mc_pg[j] = m2->mc_pg[j];
+ mc->mc_ki[j] = m2->mc_ki[j];
+ }
+ if (m2->mc_xcursor) {
+ MDB_xcursor *mx, *mx2;
+ mx = (MDB_xcursor *)(mc+1);
+ mc->mc_xcursor = mx;
+ mx2 = m2->mc_xcursor;
+ mx->mx_db = mx2->mx_db;
+ mx->mx_dbx = mx2->mx_dbx;
+ mx->mx_dbflag = mx2->mx_dbflag;
+ mx->mx_cursor.mc_txn = dst;
+ mx->mx_cursor.mc_dbi = mx2->mx_cursor.mc_dbi;
+ mx->mx_cursor.mc_db = &mx->mx_db;
+ mx->mx_cursor.mc_dbx = &mx->mx_dbx;
+ mx->mx_cursor.mc_dbflag = &mx->mx_dbflag;
+ mx->mx_cursor.mc_snum = mx2->mx_cursor.mc_snum;
+ mx->mx_cursor.mc_top = mx2->mx_cursor.mc_top;
+ mx->mx_cursor.mc_flags = mx2->mx_cursor.mc_flags | C_SHADOW;
+ for (j=0; j<mx2->mx_cursor.mc_snum; j++) {
+ mx->mx_cursor.mc_pg[j] = mx2->mx_cursor.mc_pg[j];
+ mx->mx_cursor.mc_ki[j] = mx2->mx_cursor.mc_ki[j];
+ }
+ } else {
+ mc->mc_xcursor = NULL;
+ }
+ mc->mc_next = dst->mt_cursors[i];
+ dst->mt_cursors[i] = mc;
+ }
+ }
+ }
+ return MDB_SUCCESS;
+}
+
+/** Merge shadow cursors back into parent's */
+static void
+mdb_cursor_merge(MDB_txn *txn)
+{
+ MDB_dbi i;
+ for (i=0; i<txn->mt_numdbs; i++) {
+ if (txn->mt_cursors[i]) {
+ MDB_cursor *mc;
+ while ((mc = txn->mt_cursors[i])) {
+ txn->mt_cursors[i] = mc->mc_next;
+ if (mc->mc_flags & C_SHADOW) {
+ MDB_cursor *m2 = mc->mc_orig;
+ unsigned int j;
+ m2->mc_snum = mc->mc_snum;
+ m2->mc_top = mc->mc_top;
+ for (j=0; j<mc->mc_snum; j++) {
+ m2->mc_pg[j] = mc->mc_pg[j];
+ m2->mc_ki[j] = mc->mc_ki[j];
+ }
+ }
+ if (mc->mc_flags & C_ALLOCD)
+ free(mc);
+ }
+ }
+ }
+}
+
+static void
mdb_txn_reset0(MDB_txn *txn);
/** Common code for #mdb_txn_begin() and #mdb_txn_renew().
* fail for read-only transactions, and then only if the
* reader table is full.
*/
-static inline int
+static int
mdb_txn_renew0(MDB_txn *txn)
{
MDB_env *env = txn->mt_env;
+ char mt_dbflag = 0;
if (txn->mt_flags & MDB_TXN_RDONLY) {
MDB_reader *r = pthread_getspecific(env->me_txkey);
r = &env->me_txns->mti_readers[i];
pthread_setspecific(env->me_txkey, r);
}
- txn->mt_txnid = env->me_txns->mti_txnid;
txn->mt_toggle = env->me_txns->mti_me_toggle;
+ txn->mt_txnid = env->me_txns->mti_txnid;
+ /* This happens if a different process was the
+ * last writer to the DB.
+ */
+ if (env->me_wtxnid < txn->mt_txnid)
+ mt_dbflag = DB_STALE;
r->mr_txnid = txn->mt_txnid;
txn->mt_u.reader = r;
} else {
LOCK_MUTEX_W(env);
- txn->mt_txnid = env->me_txns->mti_txnid+1;
+ txn->mt_txnid = env->me_txns->mti_txnid;
+ if (env->me_wtxnid < txn->mt_txnid)
+ mt_dbflag = DB_STALE;
+ txn->mt_txnid++;
txn->mt_toggle = env->me_txns->mti_me_toggle;
txn->mt_u.dirty_list = env->me_dirty_list;
txn->mt_u.dirty_list[0].mid = 0;
(txn->mt_numdbs - 2) * sizeof(MDB_db));
LAZY_RWLOCK_UNLOCK(&env->me_dblock);
+ memset(txn->mt_dbflags, mt_dbflag, env->me_numdbs);
+
return MDB_SUCCESS;
}
rc = mdb_txn_renew0(txn);
if (rc == MDB_SUCCESS) {
- DPRINTF("renew txn %lu%c %p on mdbenv %p, root page %lu",
- txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w', txn,
- (void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root);
+ DPRINTF("renew txn %zu%c %p on mdbenv %p, root page %zu",
+ txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w',
+ (void *)txn, (void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root);
}
return rc;
}
int
-mdb_txn_begin(MDB_env *env, unsigned int flags, MDB_txn **ret)
+mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
{
MDB_txn *txn;
- int rc;
+ int rc, size;
if (env->me_flags & MDB_FATAL_ERROR) {
DPUTS("environment had fatal error, must shutdown!");
return MDB_PANIC;
}
- if ((txn = calloc(1, sizeof(MDB_txn) + env->me_maxdbs * sizeof(MDB_db))) == NULL) {
+ if (parent) {
+ /* parent already has an active child txn */
+ if (parent->mt_child) {
+ return EINVAL;
+ }
+ }
+ size = sizeof(MDB_txn) + env->me_maxdbs * (sizeof(MDB_db)+1);
+ if (!(flags & MDB_RDONLY))
+ size += env->me_maxdbs * sizeof(MDB_cursor *);
+
+ if ((txn = calloc(1, size)) == NULL) {
DPRINTF("calloc: %s", strerror(ErrCode()));
return ENOMEM;
}
txn->mt_dbs = (MDB_db *)(txn+1);
if (flags & MDB_RDONLY) {
txn->mt_flags |= MDB_TXN_RDONLY;
+ txn->mt_dbflags = (unsigned char *)(txn->mt_dbs + env->me_maxdbs);
+ } else {
+ txn->mt_cursors = (MDB_cursor **)(txn->mt_dbs + env->me_maxdbs);
+ txn->mt_dbflags = (unsigned char *)(txn->mt_cursors + env->me_maxdbs);
}
txn->mt_env = env;
- rc = mdb_txn_renew0(txn);
+ if (parent) {
+ txn->mt_free_pgs = mdb_midl_alloc();
+ if (!txn->mt_free_pgs) {
+ free(txn);
+ return ENOMEM;
+ }
+ txn->mt_u.dirty_list = malloc(sizeof(ID2)*MDB_IDL_UM_SIZE);
+ if (!txn->mt_u.dirty_list) {
+ free(txn->mt_free_pgs);
+ free(txn);
+ return ENOMEM;
+ }
+ txn->mt_txnid = parent->mt_txnid;
+ txn->mt_toggle = parent->mt_toggle;
+ txn->mt_u.dirty_list[0].mid = 0;
+ txn->mt_free_pgs[0] = 0;
+ txn->mt_next_pgno = parent->mt_next_pgno;
+ parent->mt_child = txn;
+ txn->mt_parent = parent;
+ txn->mt_numdbs = parent->mt_numdbs;
+ txn->mt_dbxs = parent->mt_dbxs;
+ memcpy(txn->mt_dbs, parent->mt_dbs, txn->mt_numdbs * sizeof(MDB_db));
+ memcpy(txn->mt_dbflags, parent->mt_dbflags, txn->mt_numdbs);
+ mdb_cursor_shadow(parent, txn);
+ rc = 0;
+ } else {
+ rc = mdb_txn_renew0(txn);
+ }
if (rc)
free(txn);
else {
*ret = txn;
- DPRINTF("begin txn %lu%c %p on mdbenv %p, root page %lu",
- txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w', txn,
- (void *) env, txn->mt_dbs[MAIN_DBI].md_root);
+ DPRINTF("begin txn %zu%c %p on mdbenv %p, root page %zu",
+ txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w',
+ (void *) txn, (void *) env, txn->mt_dbs[MAIN_DBI].md_root);
}
return rc;
/** Common code for #mdb_txn_reset() and #mdb_txn_abort().
* @param[in] txn the transaction handle to reset
*/
-static inline void
+static void
mdb_txn_reset0(MDB_txn *txn)
{
MDB_env *env = txn->mt_env;
MDB_page *dp;
unsigned int i;
+ /* close(free) all cursors */
+ for (i=0; i<txn->mt_numdbs; i++) {
+ if (txn->mt_cursors[i]) {
+ MDB_cursor *mc;
+ while ((mc = txn->mt_cursors[i])) {
+ txn->mt_cursors[i] = mc->mc_next;
+ if (mc->mc_flags & C_ALLOCD)
+ free(mc);
+ }
+ }
+ }
+
/* return all dirty pages to dpage list */
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++) {
dp = txn->mt_u.dirty_list[i].mptr;
if (!IS_OVERFLOW(dp) || dp->mp_pages == 1) {
dp->mp_next = txn->mt_env->me_dpages;
+ VGMEMP_FREE(txn->mt_env, dp);
txn->mt_env->me_dpages = dp;
} else {
/* large pages just get freed directly */
+ VGMEMP_FREE(txn->mt_env, dp);
free(dp);
}
}
+ if (txn->mt_parent) {
+ txn->mt_parent->mt_child = NULL;
+ free(txn->mt_free_pgs);
+ free(txn->mt_u.dirty_list);
+ return;
+ } else {
+ if (mdb_midl_shrink(&txn->mt_free_pgs))
+ env->me_free_pgs = txn->mt_free_pgs;
+ }
+
while ((mop = txn->mt_env->me_pghead)) {
txn->mt_env->me_pghead = mop->mo_next;
free(mop);
}
+ txn->mt_env->me_pgfirst = 0;
+ txn->mt_env->me_pglast = 0;
env->me_txn = NULL;
- for (i=2; i<env->me_numdbs; i++)
- env->me_dbxs[i].md_dirty = 0;
/* The writer mutex was locked in mdb_txn_begin. */
UNLOCK_MUTEX_W(env);
}
if (txn == NULL)
return;
- DPRINTF("reset txn %lu%c %p on mdbenv %p, root page %lu",
- txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w', txn,
- (void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root);
+ DPRINTF("reset txn %zu%c %p on mdbenv %p, root page %zu",
+ txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w',
+ (void *) txn, (void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root);
mdb_txn_reset0(txn);
}
if (txn == NULL)
return;
- DPRINTF("abort txn %lu%c %p on mdbenv %p, root page %lu",
- txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w', txn,
- (void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root);
+ DPRINTF("abort txn %zu%c %p on mdbenv %p, root page %zu",
+ txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w',
+ (void *)txn, (void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root);
+
+ if (txn->mt_child)
+ mdb_txn_abort(txn->mt_child);
mdb_txn_reset0(txn);
free(txn);
off_t size;
MDB_page *dp;
MDB_env *env;
- pgno_t next;
+ pgno_t next, freecnt;
MDB_cursor mc;
assert(txn != NULL);
assert(txn->mt_env != NULL);
+ if (txn->mt_child) {
+ mdb_txn_commit(txn->mt_child);
+ txn->mt_child = NULL;
+ }
+
env = txn->mt_env;
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) {
+ if (txn->mt_numdbs > env->me_numdbs) {
+ /* update the DB tables */
+ int toggle = !env->me_db_toggle;
+ MDB_db *ip, *jp;
+ MDB_dbi i;
+
+ ip = &env->me_dbs[toggle][env->me_numdbs];
+ jp = &txn->mt_dbs[env->me_numdbs];
+ LAZY_RWLOCK_WRLOCK(&env->me_dblock);
+ for (i = env->me_numdbs; i < txn->mt_numdbs; i++) {
+ *ip++ = *jp++;
+ }
+
+ env->me_db_toggle = toggle;
+ env->me_numdbs = txn->mt_numdbs;
+ LAZY_RWLOCK_UNLOCK(&env->me_dblock);
+ }
mdb_txn_abort(txn);
return MDB_SUCCESS;
}
- if (txn != env->me_txn) {
- DPUTS("attempt to commit unknown transaction");
+ if (F_ISSET(txn->mt_flags, MDB_TXN_ERROR)) {
+ DPUTS("error flag is set, can't commit");
+ if (txn->mt_parent)
+ txn->mt_parent->mt_flags |= MDB_TXN_ERROR;
mdb_txn_abort(txn);
return EINVAL;
}
- if (F_ISSET(txn->mt_flags, MDB_TXN_ERROR)) {
- DPUTS("error flag is set, can't commit");
+ /* Merge (and close) our cursors with parent's */
+ mdb_cursor_merge(txn);
+
+ if (txn->mt_parent) {
+ MDB_db *ip, *jp;
+ MDB_dbi i;
+ unsigned x, y;
+ ID2L dst, src;
+
+ /* Update parent's DB table */
+ ip = &txn->mt_parent->mt_dbs[2];
+ jp = &txn->mt_dbs[2];
+ for (i = 2; i < txn->mt_numdbs; i++) {
+ if (ip->md_root != jp->md_root)
+ *ip = *jp;
+ ip++; jp++;
+ }
+ txn->mt_parent->mt_numdbs = txn->mt_numdbs;
+
+ /* Append our free list to parent's */
+ mdb_midl_append_list(&txn->mt_parent->mt_free_pgs,
+ txn->mt_free_pgs);
+ mdb_midl_free(txn->mt_free_pgs);
+
+ /* Merge our dirty list with parent's */
+ dst = txn->mt_parent->mt_u.dirty_list;
+ src = txn->mt_u.dirty_list;
+ x = mdb_mid2l_search(dst, src[1].mid);
+ for (y=1; y<=src[0].mid; y++) {
+ while (x <= dst[0].mid && dst[x].mid != src[y].mid) x++;
+ if (x > dst[0].mid)
+ break;
+ free(dst[x].mptr);
+ dst[x].mptr = src[y].mptr;
+ }
+ x = dst[0].mid;
+ for (; y<=src[0].mid; y++) {
+ if (++x >= MDB_IDL_UM_MAX) {
+ mdb_txn_abort(txn);
+ return ENOMEM;
+ }
+ dst[x] = src[y];
+ }
+ dst[0].mid = x;
+ free(txn->mt_u.dirty_list);
+ txn->mt_parent->mt_child = NULL;
+ free(txn);
+ return MDB_SUCCESS;
+ }
+
+ if (txn != env->me_txn) {
+ DPUTS("attempt to commit unknown transaction");
mdb_txn_abort(txn);
return EINVAL;
}
if (!txn->mt_u.dirty_list[0].mid)
goto done;
- DPRINTF("committing txn %lu %p on mdbenv %p, root page %lu",
- txn->mt_txnid, txn, (void *)env, txn->mt_dbs[MAIN_DBI].md_root);
+ DPRINTF("committing txn %zu %p on mdbenv %p, root page %zu",
+ txn->mt_txnid, (void *)txn, (void *)env, txn->mt_dbs[MAIN_DBI].md_root);
- mc.mc_txn = txn;
- mc.mc_dbi = FREE_DBI;
- mc.mc_flags = 0;
+ mdb_cursor_init(&mc, txn, FREE_DBI, NULL);
/* should only be one record now */
if (env->me_pghead) {
/* make sure first page of freeDB is touched and on freelist */
- mdb_search_page(&mc, NULL, 1);
+ mdb_page_search(&mc, NULL, 1);
+ }
+
+ /* Delete IDLs we used from the free list */
+ if (env->me_pgfirst) {
+ txnid_t cur;
+ MDB_val key;
+ int exact = 0;
+
+ key.mv_size = sizeof(cur);
+ for (cur = env->me_pgfirst; cur <= env->me_pglast; cur++) {
+ key.mv_data = &cur;
+
+ mdb_cursor_set(&mc, &key, NULL, MDB_SET, &exact);
+ mdb_cursor_del(&mc, 0);
+ }
+ env->me_pgfirst = 0;
+ env->me_pglast = 0;
}
+
/* save to free list */
+free2:
+ freecnt = txn->mt_free_pgs[0];
if (!MDB_IDL_IS_ZERO(txn->mt_free_pgs)) {
MDB_val key, data;
- ULONG i;
/* make sure last page of freeDB is touched and on freelist */
key.mv_size = MAXKEYSIZE+1;
key.mv_data = NULL;
- mdb_search_page(&mc, &key, 1);
+ mdb_page_search(&mc, &key, 1);
mdb_midl_sort(txn->mt_free_pgs);
-#if DEBUG > 1
+#if MDB_DEBUG > 1
{
unsigned int i;
- ULONG *idl = txn->mt_free_pgs;
- DPRINTF("IDL write txn %lu root %lu num %lu",
+ ID *idl = txn->mt_free_pgs;
+ DPRINTF("IDL write txn %zu root %zu num %zu",
txn->mt_txnid, txn->mt_dbs[FREE_DBI].md_root, idl[0]);
for (i=0; i<idl[0]; i++) {
- DPRINTF("IDL %lu", idl[i+1]);
+ DPRINTF("IDL %zu", idl[i+1]);
}
}
#endif
/* write to last page of freeDB */
key.mv_size = sizeof(pgno_t);
- key.mv_data = (char *)&txn->mt_txnid;
+ key.mv_data = &txn->mt_txnid;
data.mv_data = txn->mt_free_pgs;
/* The free list can still grow during this call,
* despite the pre-emptive touches above. So check
* and make sure the entire thing got written.
*/
do {
- i = txn->mt_free_pgs[0];
+ freecnt = txn->mt_free_pgs[0];
data.mv_size = MDB_IDL_SIZEOF(txn->mt_free_pgs);
rc = mdb_cursor_put(&mc, &key, &data, 0);
if (rc) {
mdb_txn_abort(txn);
return rc;
}
- } while (i != txn->mt_free_pgs[0]);
+ } while (freecnt != txn->mt_free_pgs[0]);
}
/* should only be one record now */
+again:
if (env->me_pghead) {
MDB_val key, data;
MDB_oldpages *mop;
+ pgno_t orig;
+ txnid_t id;
mop = env->me_pghead;
- key.mv_size = sizeof(pgno_t);
- key.mv_data = (char *)&mop->mo_txnid;
+ id = mop->mo_txnid;
+ key.mv_size = sizeof(id);
+ key.mv_data = &id;
data.mv_size = MDB_IDL_SIZEOF(mop->mo_pages);
data.mv_data = mop->mo_pages;
+ orig = mop->mo_pages[0];
+ /* These steps may grow the freelist again
+ * due to freed overflow pages...
+ */
mdb_cursor_put(&mc, &key, &data, 0);
- free(env->me_pghead);
- env->me_pghead = NULL;
+ if (mop == env->me_pghead && env->me_pghead->mo_txnid == id) {
+ /* could have been used again here */
+ if (mop->mo_pages[0] != orig) {
+ data.mv_size = MDB_IDL_SIZEOF(mop->mo_pages);
+ data.mv_data = mop->mo_pages;
+ id = mop->mo_txnid;
+ mdb_cursor_put(&mc, &key, &data, 0);
+ }
+ env->me_pghead = NULL;
+ free(mop);
+ } else {
+ /* was completely used up */
+ mdb_cursor_del(&mc, 0);
+ if (env->me_pghead)
+ goto again;
+ }
+ env->me_pgfirst = 0;
+ env->me_pglast = 0;
+ }
+ /* Check for growth of freelist again */
+ if (freecnt != txn->mt_free_pgs[0])
+ goto free2;
+
+ if (!MDB_IDL_IS_ZERO(txn->mt_free_pgs)) {
+ if (mdb_midl_shrink(&txn->mt_free_pgs))
+ env->me_free_pgs = txn->mt_free_pgs;
}
/* Update DB root pointers. Their pages have already been
* touched so this is all in-place and cannot fail.
*/
{
+ MDB_dbi i;
MDB_val data;
data.mv_size = sizeof(MDB_db);
- mc.mc_dbi = MAIN_DBI;
- mc.mc_flags = 0;
+ mdb_cursor_init(&mc, txn, MAIN_DBI, NULL);
for (i = 2; i < txn->mt_numdbs; i++) {
- if (txn->mt_dbxs[i].md_dirty) {
+ if (txn->mt_dbflags[i] & DB_DIRTY) {
data.mv_data = &txn->mt_dbs[i];
mdb_cursor_put(&mc, &txn->mt_dbxs[i].md_name, &data, 0);
}
}
}
+#if MDB_DEBUG > 2
+ mdb_audit(txn);
+#endif
/* Commit up to MDB_COMMIT_PAGES dirty pages to disk until done.
*/
for (; i<=txn->mt_u.dirty_list[0].mid; i++) {
size_t wsize;
dp = txn->mt_u.dirty_list[i].mptr;
- DPRINTF("committing page %lu", dp->mp_pgno);
+ DPRINTF("committing page %zu", dp->mp_pgno);
size = dp->mp_pgno * env->me_psize;
ov.Offset = size & 0xffffffff;
ov.OffsetHigh = size >> 16;
return n;
}
}
- done = 1;;
+ done = 1;
#else
struct iovec iov[MDB_COMMIT_PAGES];
n = 0;
dp = txn->mt_u.dirty_list[i].mptr;
if (dp->mp_pgno != next) {
if (n) {
- DPRINTF("committing %u dirty pages", n);
rc = writev(env->me_fd, iov, n);
if (rc != size) {
n = ErrCode();
lseek(env->me_fd, dp->mp_pgno * env->me_psize, SEEK_SET);
next = dp->mp_pgno;
}
- DPRINTF("committing page %lu", dp->mp_pgno);
+ DPRINTF("committing page %zu", dp->mp_pgno);
iov[n].iov_len = env->me_psize;
if (IS_OVERFLOW(dp)) iov[n].iov_len *= dp->mp_pages;
- iov[n].iov_base = dp;
+ iov[n].iov_base = (char *)dp;
size += iov[n].iov_len;
next = dp->mp_pgno + (IS_OVERFLOW(dp) ? dp->mp_pages : 1);
/* clear dirty flag */
if (n == 0)
break;
- DPRINTF("committing %u dirty pages", n);
rc = writev(env->me_fd, iov, n);
if (rc != size) {
n = ErrCode();
dp = txn->mt_u.dirty_list[i].mptr;
if (!IS_OVERFLOW(dp) || dp->mp_pages == 1) {
dp->mp_next = txn->mt_env->me_dpages;
+ VGMEMP_FREE(txn->mt_env, dp);
txn->mt_env->me_dpages = dp;
} else {
+ VGMEMP_FREE(txn->mt_env, dp);
free(dp);
}
txn->mt_u.dirty_list[i].mid = 0;
mdb_txn_abort(txn);
return n;
}
+ env->me_wtxnid = txn->mt_txnid;
done:
env->me_txn = NULL;
{
int toggle = !env->me_db_toggle;
MDB_db *ip, *jp;
+ MDB_dbi i;
ip = &env->me_dbs[toggle][2];
jp = &txn->mt_dbs[2];
ip++; jp++;
}
- for (i = 2; i < txn->mt_numdbs; i++) {
- if (txn->mt_dbxs[i].md_dirty)
- txn->mt_dbxs[i].md_dirty = 0;
- }
env->me_db_toggle = toggle;
env->me_numdbs = txn->mt_numdbs;
LAZY_RWLOCK_UNLOCK(&env->me_dblock);
static int
mdb_env_read_header(MDB_env *env, MDB_meta *meta)
{
- char page[PAGESIZE];
+ MDB_pagebuf pbuf;
MDB_page *p;
MDB_meta *m;
int rc, err;
*/
#ifdef _WIN32
- if (!ReadFile(env->me_fd, page, PAGESIZE, (DWORD *)&rc, NULL) || rc == 0)
+ if (!ReadFile(env->me_fd, &pbuf, MDB_PAGESIZE, (DWORD *)&rc, NULL) || rc == 0)
#else
- if ((rc = read(env->me_fd, page, PAGESIZE)) == 0)
+ if ((rc = read(env->me_fd, &pbuf, MDB_PAGESIZE)) == 0)
#endif
{
return ENOENT;
}
- else if (rc != PAGESIZE) {
+ else if (rc != MDB_PAGESIZE) {
err = ErrCode();
if (rc > 0)
err = EINVAL;
return err;
}
- p = (MDB_page *)page;
+ p = (MDB_page *)&pbuf;
if (!F_ISSET(p->mp_flags, P_META)) {
- DPRINTF("page %lu not a meta page", p->mp_pgno);
+ DPRINTF("page %zu not a meta page", p->mp_pgno);
return EINVAL;
}
assert(txn->mt_env != NULL);
toggle = !txn->mt_toggle;
- DPRINTF("writing meta page %d for root page %lu",
+ DPRINTF("writing meta page %d for root page %zu",
toggle, txn->mt_dbs[MAIN_DBI].md_root);
env = txn->mt_env;
MDB_env *e;
e = calloc(1, sizeof(MDB_env));
- if (!e) return ENOMEM;
+ if (!e)
+ return ENOMEM;
+ e->me_free_pgs = mdb_midl_alloc();
+ if (!e->me_free_pgs) {
+ free(e);
+ return ENOMEM;
+ }
e->me_maxreaders = DEFAULT_READERS;
e->me_maxdbs = 2;
e->me_fd = INVALID_HANDLE_VALUE;
e->me_lfd = INVALID_HANDLE_VALUE;
e->me_mfd = INVALID_HANDLE_VALUE;
+ VGMEMP_CREATE(e,0,0);
*env = e;
return MDB_SUCCESS;
}
if (env->me_map)
return EINVAL;
env->me_mapsize = size;
+ if (env->me_psize)
+ env->me_maxpg = env->me_mapsize / env->me_psize;
return MDB_SUCCESS;
}
int
-mdb_env_set_maxdbs(MDB_env *env, int dbs)
+mdb_env_set_maxdbs(MDB_env *env, MDB_dbi dbs)
{
if (env->me_map)
return EINVAL;
}
int
-mdb_env_set_maxreaders(MDB_env *env, int readers)
+mdb_env_set_maxreaders(MDB_env *env, unsigned int readers)
{
- if (env->me_map)
+ if (env->me_map || readers < 1)
return EINVAL;
env->me_maxreaders = readers;
return MDB_SUCCESS;
}
int
-mdb_env_get_maxreaders(MDB_env *env, int *readers)
+mdb_env_get_maxreaders(MDB_env *env, unsigned int *readers)
{
if (!env || !readers)
return EINVAL;
i |= MAP_FIXED;
env->me_map = mmap(meta.mm_address, env->me_mapsize, PROT_READ, i,
env->me_fd, 0);
- if (env->me_map == MAP_FAILED)
+ if (env->me_map == MAP_FAILED) {
+ env->me_map = NULL;
return ErrCode();
+ }
#endif
if (newenv) {
DPRINTF("opened database version %u, pagesize %u",
env->me_metas[toggle]->mm_version, env->me_psize);
DPRINTF("depth: %u", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_depth);
- DPRINTF("entries: %lu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_entries);
- DPRINTF("branch pages: %lu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_branch_pages);
- DPRINTF("leaf pages: %lu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_leaf_pages);
- DPRINTF("overflow pages: %lu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_overflow_pages);
- DPRINTF("root: %lu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_root);
+ DPRINTF("entries: %zu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_entries);
+ DPRINTF("branch pages: %zu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_branch_pages);
+ DPRINTF("leaf pages: %zu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_leaf_pages);
+ DPRINTF("overflow pages: %zu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_overflow_pages);
+ DPRINTF("root: %zu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_root);
return MDB_SUCCESS;
}
#ifndef _WIN32
-/* Windows doesn't support destructor callbacks for thread-specific storage */
+/** Release a reader thread's slot in the reader lock table.
+ * This function is called automatically when a thread exits.
+ * Windows doesn't support destructor callbacks for thread-specific storage,
+ * so this function is not compiled there.
+ * @param[in] ptr This points to the slot in the reader lock table.
+ */
static void
mdb_env_reader_dest(void *ptr)
{
}
#endif
-/* downgrade the exclusive lock on the region back to shared */
+/** Downgrade the exclusive lock on the region back to shared */
static void
mdb_env_share_locks(MDB_env *env)
{
}
#endif
}
+#if defined(_WIN32) || defined(__APPLE__)
+/*
+ * hash_64 - 64 bit Fowler/Noll/Vo-0 FNV-1a hash code
+ *
+ * @(#) $Revision: 5.1 $
+ * @(#) $Id: hash_64a.c,v 5.1 2009/06/30 09:01:38 chongo Exp $
+ * @(#) $Source: /usr/local/src/cmd/fnv/RCS/hash_64a.c,v $
+ *
+ * http://www.isthe.com/chongo/tech/comp/fnv/index.html
+ *
+ ***
+ *
+ * Please do not copyright this code. This code is in the public domain.
+ *
+ * LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
+ * EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ *
+ * By:
+ * chongo <Landon Curt Noll> /\oo/\
+ * http://www.isthe.com/chongo/
+ *
+ * Share and Enjoy! :-)
+ */
+
+typedef unsigned long long mdb_hash_t;
+#define MDB_HASH_INIT ((mdb_hash_t)0xcbf29ce484222325ULL)
+
+/** perform a 64 bit Fowler/Noll/Vo FNV-1a hash on a buffer
+ * @param[in] str string to hash
+ * @param[in] hval initial value for hash
+ * @return 64 bit hash
+ *
+ * NOTE: To use the recommended 64 bit FNV-1a hash, use MDB_HASH_INIT as the
+ * hval arg on the first call.
+ */
+static mdb_hash_t
+mdb_hash_str(char *str, mdb_hash_t hval)
+{
+ unsigned char *s = (unsigned char *)str; /* unsigned string */
+ /*
+ * FNV-1a hash each octet of the string
+ */
+ while (*s) {
+ /* xor the bottom with the current octet */
+ hval ^= (mdb_hash_t)*s++;
+
+ /* multiply by the 64 bit FNV magic prime mod 2^64 */
+ hval += (hval << 1) + (hval << 4) + (hval << 5) +
+ (hval << 7) + (hval << 8) + (hval << 40);
+ }
+ /* return our new hash value */
+ return hval;
+}
+
+/** Hash the string and output the hash in hex.
+ * @param[in] str string to hash
+ * @param[out] hexbuf an array of 17 chars to hold the hash
+ */
+static void
+mdb_hash_hex(char *str, char *hexbuf)
+{
+ int i;
+ mdb_hash_t h = mdb_hash_str(str, MDB_HASH_INIT);
+ for (i=0; i<8; i++) {
+ hexbuf += sprintf(hexbuf, "%02x", (unsigned int)h & 0xff);
+ h >>= 8;
+ }
+}
+#endif
+/** Open and/or initialize the lock region for the environment.
+ * @param[in] env The MDB environment.
+ * @param[in] lpath The pathname of the file used for the lock region.
+ * @param[in] mode The Unix permissions for the file, if we create it.
+ * @param[out] excl Set to true if we got an exclusive lock on the region.
+ * @return 0 on success, non-zero on failure.
+ */
static int
mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
{
size = rsize - sizeof(MDB_txninfo);
env->me_maxreaders = size/sizeof(MDB_reader) + 1;
}
-#ifdef _WIN32
{
+#ifdef _WIN32
HANDLE mh;
mh = CreateFileMapping(env->me_lfd, NULL, PAGE_READWRITE,
0, 0, NULL);
rc = ErrCode();
goto fail;
}
- }
#else
- env->me_txns = mmap(0, rsize, PROT_READ|PROT_WRITE, MAP_SHARED,
- env->me_lfd, 0);
- if (env->me_txns == MAP_FAILED) {
- rc = ErrCode();
- goto fail;
- }
+ void *m = mmap(NULL, rsize, PROT_READ|PROT_WRITE, MAP_SHARED,
+ env->me_lfd, 0);
+ if (m == MAP_FAILED) {
+ env->me_txns = NULL;
+ rc = ErrCode();
+ goto fail;
+ }
+ env->me_txns = m;
#endif
+ }
if (*excl) {
#ifdef _WIN32
- char *ptr;
+ char hexbuf[17];
if (!mdb_sec_inited) {
InitializeSecurityDescriptor(&mdb_null_sd,
SECURITY_DESCRIPTOR_REVISION);
mdb_all_sa.lpSecurityDescriptor = &mdb_null_sd;
mdb_sec_inited = 1;
}
- /* FIXME: only using up to 20 characters of the env path here,
- * probably not enough to assure uniqueness...
- */
- sprintf(env->me_txns->mti_rmname, "Global\\MDBr%.20s", lpath);
- ptr = env->me_txns->mti_rmname + sizeof("Global\\MDBr");
- while ((ptr = strchr(ptr, '\\')))
- *ptr++ = '/';
+ mdb_hash_hex(lpath, hexbuf);
+ sprintf(env->me_txns->mti_rmname, "Global\\MDBr%s", hexbuf);
env->me_rmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_rmname);
if (!env->me_rmutex) {
rc = ErrCode();
goto fail;
}
- sprintf(env->me_txns->mti_rmname, "Global\\MDBw%.20s", lpath);
- ptr = env->me_txns->mti_rmname + sizeof("Global\\MDBw");
- while ((ptr = strchr(ptr, '\\')))
- *ptr++ = '/';
- env->me_wmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_rmname);
+ sprintf(env->me_txns->mti_wmname, "Global\\MDBw%s", hexbuf);
+ env->me_wmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_wmname);
if (!env->me_wmutex) {
rc = ErrCode();
goto fail;
}
-#else
+#else /* _WIN32 */
+#ifdef __APPLE__
+ char hexbuf[17];
+ mdb_hash_hex(lpath, hexbuf);
+ sprintf(env->me_txns->mti_rmname, "MDBr%s", hexbuf);
+ if (sem_unlink(env->me_txns->mti_rmname)) {
+ rc = ErrCode();
+ if (rc != ENOENT && rc != EINVAL)
+ goto fail;
+ }
+ env->me_rmutex = sem_open(env->me_txns->mti_rmname, O_CREAT, mode, 1);
+ if (!env->me_rmutex) {
+ rc = ErrCode();
+ goto fail;
+ }
+ sprintf(env->me_txns->mti_wmname, "MDBw%s", hexbuf);
+ if (sem_unlink(env->me_txns->mti_wmname)) {
+ rc = ErrCode();
+ if (rc != ENOENT && rc != EINVAL)
+ goto fail;
+ }
+ env->me_wmutex = sem_open(env->me_txns->mti_wmname, O_CREAT, mode, 1);
+ if (!env->me_wmutex) {
+ rc = ErrCode();
+ goto fail;
+ }
+#else /* __APPLE__ */
pthread_mutexattr_t mattr;
pthread_mutexattr_init(&mattr);
}
pthread_mutex_init(&env->me_txns->mti_mutex, &mattr);
pthread_mutex_init(&env->me_txns->mti_wmutex, &mattr);
-#endif
+#endif /* __APPLE__ */
+#endif /* _WIN32 */
env->me_txns->mti_version = MDB_VERSION;
env->me_txns->mti_magic = MDB_MAGIC;
env->me_txns->mti_txnid = 0;
rc = ErrCode();
goto fail;
}
+#endif
+#ifdef __APPLE__
+ env->me_rmutex = sem_open(env->me_txns->mti_rmname, 0);
+ if (!env->me_rmutex) {
+ rc = ErrCode();
+ goto fail;
+ }
+ env->me_wmutex = sem_open(env->me_txns->mti_wmname, 0);
+ if (!env->me_wmutex) {
+ rc = ErrCode();
+ goto fail;
+ }
#endif
}
return MDB_SUCCESS;
#define LOCKNAME "/lock.mdb"
/** The name of the data file in the DB environment */
#define DATANAME "/data.mdb"
+ /** The suffix of the lock file when no subdir is used */
+#define LOCKSUFF "-lock"
+
int
mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode)
{
char *lpath, *dpath;
len = strlen(path);
- lpath = malloc(len + sizeof(LOCKNAME) + len + sizeof(DATANAME));
+ if (flags & MDB_NOSUBDIR) {
+ rc = len + sizeof(LOCKSUFF) + len + 1;
+ } else {
+ rc = len + sizeof(LOCKNAME) + len + sizeof(DATANAME);
+ }
+ lpath = malloc(rc);
if (!lpath)
return ENOMEM;
- dpath = lpath + len + sizeof(LOCKNAME);
- sprintf(lpath, "%s" LOCKNAME, path);
- sprintf(dpath, "%s" DATANAME, path);
+ if (flags & MDB_NOSUBDIR) {
+ dpath = lpath + len + sizeof(LOCKSUFF);
+ sprintf(lpath, "%s" LOCKSUFF, path);
+ strcpy(dpath, path);
+ } else {
+ dpath = lpath + len + sizeof(LOCKNAME);
+ sprintf(lpath, "%s" LOCKNAME, path);
+ sprintf(dpath, "%s" DATANAME, path);
+ }
rc = mdb_env_setup_locks(env, lpath, mode, &excl);
if (rc)
if (env == NULL)
return;
+ VGMEMP_DESTROY(env);
while (env->me_dpages) {
dp = env->me_dpages;
+ VGMEMP_DEFINED(&dp->mp_next, sizeof(dp->mp_next));
env->me_dpages = dp->mp_next;
free(dp);
}
for (i=0; i<env->me_txns->mti_numreaders; i++)
if (env->me_txns->mti_readers[i].mr_pid == pid)
env->me_txns->mti_readers[i].mr_pid = 0;
- munmap(env->me_txns, (env->me_maxreaders-1)*sizeof(MDB_reader)+sizeof(MDB_txninfo));
+ munmap((void *)env->me_txns, (env->me_maxreaders-1)*sizeof(MDB_reader)+sizeof(MDB_txninfo));
}
close(env->me_lfd);
+ mdb_midl_free(env->me_free_pgs);
free(env);
}
-/* only for aligned ints */
+/** Compare two items pointing at aligned size_t's */
static int
-intcmp(const MDB_val *a, const MDB_val *b)
+mdb_cmp_long(const MDB_val *a, const MDB_val *b)
{
- if (a->mv_size == sizeof(long))
- {
- unsigned long *la, *lb;
- la = a->mv_data;
- lb = b->mv_data;
- return *la - *lb;
- } else {
- unsigned int *ia, *ib;
- ia = a->mv_data;
- ib = b->mv_data;
- return *ia - *ib;
- }
+ return (*(size_t *)a->mv_data < *(size_t *)b->mv_data) ? -1 :
+ *(size_t *)a->mv_data > *(size_t *)b->mv_data;
}
-/* ints must always be the same size */
+/** Compare two items pointing at aligned int's */
static int
-cintcmp(const MDB_val *a, const MDB_val *b)
+mdb_cmp_int(const MDB_val *a, const MDB_val *b)
{
-#if __BYTE_ORDER == __LITTLE_ENDIAN
+ return (*(unsigned int *)a->mv_data < *(unsigned int *)b->mv_data) ? -1 :
+ *(unsigned int *)a->mv_data > *(unsigned int *)b->mv_data;
+}
+
+/** Compare two items pointing at ints of unknown alignment.
+ * Nodes and keys are guaranteed to be 2-byte aligned.
+ */
+static int
+mdb_cmp_cint(const MDB_val *a, const MDB_val *b)
+{
+#if BYTE_ORDER == LITTLE_ENDIAN
unsigned short *u, *c;
int x;
#endif
}
+/** Compare two items lexically */
static int
-memncmp(const MDB_val *a, const MDB_val *b)
+mdb_cmp_memn(const MDB_val *a, const MDB_val *b)
{
- int diff, len_diff;
+ int diff;
+ ssize_t len_diff;
unsigned int len;
len = a->mv_size;
- len_diff = a->mv_size - b->mv_size;
- if (len_diff > 0)
+ len_diff = (ssize_t) a->mv_size - (ssize_t) b->mv_size;
+ if (len_diff > 0) {
len = b->mv_size;
+ len_diff = 1;
+ }
+
diff = memcmp(a->mv_data, b->mv_data, len);
- return diff ? diff : len_diff;
+ return diff ? diff : len_diff<0 ? -1 : len_diff;
}
+/** Compare two items in reverse byte order */
static int
-memnrcmp(const MDB_val *a, const MDB_val *b)
+mdb_cmp_memnr(const MDB_val *a, const MDB_val *b)
{
const unsigned char *p1, *p2, *p1_lim;
- int diff, len_diff;
-
- if (b->mv_size == 0)
- return a->mv_size != 0;
- if (a->mv_size == 0)
- return -1;
+ ssize_t len_diff;
+ int diff;
- p1 = (const unsigned char *)a->mv_data + a->mv_size - 1;
- p2 = (const unsigned char *)b->mv_data + b->mv_size - 1;
+ p1_lim = (const unsigned char *)a->mv_data;
+ p1 = (const unsigned char *)a->mv_data + a->mv_size;
+ p2 = (const unsigned char *)b->mv_data + b->mv_size;
- len_diff = a->mv_size - b->mv_size;
- if (len_diff < 0)
- p1_lim = p1 - a->mv_size;
- else
- p1_lim = p1 - b->mv_size;
+ len_diff = (ssize_t) a->mv_size - (ssize_t) b->mv_size;
+ if (len_diff > 0) {
+ p1_lim += len_diff;
+ len_diff = 1;
+ }
while (p1 > p1_lim) {
- diff = *p1 - *p2;
+ diff = *--p1 - *--p2;
if (diff)
return diff;
- p1--;
- p2--;
}
- return len_diff;
+ return len_diff<0 ? -1 : len_diff;
}
-/* Search for key within a leaf page, using binary search.
+/** Search for key within a page, using binary search.
* Returns the smallest entry larger or equal to the key.
* If exactp is non-null, stores whether the found entry was an exact match
* in *exactp (1 or 0).
- * If kip is non-null, stores the index of the found entry in *kip.
+ * Updates the cursor index with the index of the found entry.
* If no entry larger or equal to the key is found, returns NULL.
*/
static MDB_node *
-mdb_search_node(MDB_cursor *mc, MDB_val *key, int *exactp)
+mdb_node_search(MDB_cursor *mc, MDB_val *key, int *exactp)
{
unsigned int i = 0, nkeys;
int low, high;
nkeys = NUMKEYS(mp);
- DPRINTF("searching %u keys in %s page %lu",
- nkeys, IS_LEAF(mp) ? "leaf" : "branch",
- mp->mp_pgno);
+#if MDB_DEBUG
+ {
+ pgno_t pgno;
+ COPY_PGNO(pgno, mp->mp_pgno);
+ DPRINTF("searching %u keys in %s %spage %zu",
+ nkeys, IS_LEAF(mp) ? "leaf" : "branch", IS_SUBP(mp) ? "sub-" : "",
+ pgno);
+ }
+#endif
assert(nkeys > 0);
low = IS_LEAF(mp) ? 0 : 1;
high = nkeys - 1;
- cmp = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_cmp;
- if (IS_LEAF2(mp)) {
- nodekey.mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
- node = NODEPTR(mp, 0); /* fake */
+ cmp = mc->mc_dbx->md_cmp;
+
+ /* Branch pages have no data, so if using integer keys,
+ * alignment is guaranteed. Use faster mdb_cmp_int.
+ */
+ if (cmp == mdb_cmp_cint && IS_BRANCH(mp)) {
+ if (NODEPTR(mp, 1)->mn_ksize == sizeof(size_t))
+ cmp = mdb_cmp_long;
+ else
+ cmp = mdb_cmp_int;
}
- while (low <= high) {
- i = (low + high) >> 1;
- if (IS_LEAF2(mp)) {
+ if (IS_LEAF2(mp)) {
+ nodekey.mv_size = mc->mc_db->md_pad;
+ node = NODEPTR(mp, 0); /* fake */
+ while (low <= high) {
+ i = (low + high) >> 1;
nodekey.mv_data = LEAF2KEY(mp, i, nodekey.mv_size);
- } else {
- node = NODEPTR(mp, i);
-
- nodekey.mv_size = node->mn_ksize;
- nodekey.mv_data = NODEKEY(node);
+ rc = cmp(key, &nodekey);
+ DPRINTF("found leaf index %u [%s], rc = %i",
+ i, DKEY(&nodekey), rc);
+ if (rc == 0)
+ break;
+ if (rc > 0)
+ low = i + 1;
+ else
+ high = i - 1;
}
+ } else {
+ while (low <= high) {
+ i = (low + high) >> 1;
- rc = cmp(key, &nodekey);
+ node = NODEPTR(mp, i);
+ nodekey.mv_size = NODEKSZ(node);
+ nodekey.mv_data = NODEKEY(node);
-#if DEBUG
- if (IS_LEAF(mp))
- DPRINTF("found leaf index %u [%s], rc = %i",
- i, DKEY(&nodekey), rc);
- else
- DPRINTF("found branch index %u [%s -> %lu], rc = %i",
- i, DKEY(&nodekey), NODEPGNO(node), rc);
+ rc = cmp(key, &nodekey);
+#if MDB_DEBUG
+ if (IS_LEAF(mp))
+ DPRINTF("found leaf index %u [%s], rc = %i",
+ i, DKEY(&nodekey), rc);
+ else
+ DPRINTF("found branch index %u [%s -> %zu], rc = %i",
+ i, DKEY(&nodekey), NODEPGNO(node), rc);
#endif
-
- if (rc == 0)
- break;
- if (rc > 0)
- low = i + 1;
- else
- high = i - 1;
+ if (rc == 0)
+ break;
+ if (rc > 0)
+ low = i + 1;
+ else
+ high = i - 1;
+ }
}
if (rc > 0) { /* Found entry is less than the key. */
return node;
}
+#if 0
static void
-cursor_pop_page(MDB_cursor *mc)
+mdb_cursor_adjust(MDB_cursor *mc, func)
+{
+ MDB_cursor *m2;
+
+ for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
+ if (m2->mc_pg[m2->mc_top] == mc->mc_pg[mc->mc_top]) {
+ func(mc, m2);
+ }
+ }
+}
+#endif
+
+/** Pop a page off the top of the cursor's stack. */
+static void
+mdb_cursor_pop(MDB_cursor *mc)
{
MDB_page *top;
if (mc->mc_snum)
mc->mc_top--;
- DPRINTF("popped page %lu off db %u cursor %p", top->mp_pgno,
+ DPRINTF("popped page %zu off db %u cursor %p", top->mp_pgno,
mc->mc_dbi, (void *) mc);
}
}
+/** Push a page onto the top of the cursor's stack. */
static int
-cursor_push_page(MDB_cursor *mc, MDB_page *mp)
+mdb_cursor_push(MDB_cursor *mc, MDB_page *mp)
{
- DPRINTF("pushing page %lu on db %u cursor %p", mp->mp_pgno,
+ DPRINTF("pushing page %zu on db %u cursor %p", mp->mp_pgno,
mc->mc_dbi, (void *) mc);
- if (mc->mc_snum >= CURSOR_STACK)
+ if (mc->mc_snum >= CURSOR_STACK) {
+ assert(mc->mc_snum < CURSOR_STACK);
return ENOMEM;
+ }
mc->mc_top = mc->mc_snum++;
mc->mc_pg[mc->mc_top] = mp;
return MDB_SUCCESS;
}
+/** Find the address of the page corresponding to a given page number.
+ * @param[in] txn the transaction for this access.
+ * @param[in] pgno the page number for the page to retrieve.
+ * @param[out] ret address of a pointer where the page's address will be stored.
+ * @return 0 on success, non-zero on failure.
+ */
static int
-mdb_get_page(MDB_txn *txn, pgno_t pgno, MDB_page **ret)
+mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **ret)
{
MDB_page *p = NULL;
}
*ret = p;
if (!p) {
- DPRINTF("page %lu not found", pgno);
+ DPRINTF("page %zu not found", pgno);
assert(p != NULL);
}
return (p != NULL) ? MDB_SUCCESS : MDB_PAGE_NOTFOUND;
}
+/** Search for the page a given key should be in.
+ * Pushes parent pages on the cursor stack. This function continues a
+ * search on a cursor that has already been initialized. (Usually by
+ * #mdb_page_search() but also by #mdb_node_move().)
+ * @param[in,out] mc the cursor for this operation.
+ * @param[in] key the key to search for. If NULL, search for the lowest
+ * page. (This is used by #mdb_cursor_first().)
+ * @param[in] modify If true, visited pages are updated with new page numbers.
+ * @return 0 on success, non-zero on failure.
+ */
static int
-mdb_search_page_root(MDB_cursor *mc, MDB_val *key, int modify)
+mdb_page_search_root(MDB_cursor *mc, MDB_val *key, int modify)
{
MDB_page *mp = mc->mc_pg[mc->mc_top];
DKBUF;
while (IS_BRANCH(mp)) {
MDB_node *node;
+ indx_t i;
- DPRINTF("branch page %lu has %u keys", mp->mp_pgno, NUMKEYS(mp));
+ DPRINTF("branch page %zu has %u keys", mp->mp_pgno, NUMKEYS(mp));
assert(NUMKEYS(mp) > 1);
- DPRINTF("found index 0 to page %lu", NODEPGNO(NODEPTR(mp, 0)));
+ DPRINTF("found index 0 to page %zu", NODEPGNO(NODEPTR(mp, 0)));
if (key == NULL) /* Initialize cursor to first page. */
- mc->mc_ki[mc->mc_top] = 0;
+ i = 0;
else if (key->mv_size > MAXKEYSIZE && key->mv_data == NULL) {
/* cursor to last page */
- mc->mc_ki[mc->mc_top] = NUMKEYS(mp)-1;
+ i = NUMKEYS(mp)-1;
} else {
int exact;
- node = mdb_search_node(mc, key, &exact);
+ node = mdb_node_search(mc, key, &exact);
if (node == NULL)
- mc->mc_ki[mc->mc_top] = NUMKEYS(mp) - 1;
- else if (!exact) {
- assert(mc->mc_ki[mc->mc_top] > 0);
- mc->mc_ki[mc->mc_top]--;
+ i = NUMKEYS(mp) - 1;
+ else {
+ i = mc->mc_ki[mc->mc_top];
+ if (!exact) {
+ assert(i > 0);
+ i--;
+ }
}
}
if (key)
DPRINTF("following index %u for key [%s]",
- mc->mc_ki[mc->mc_top], DKEY(key));
- assert(mc->mc_ki[mc->mc_top] < NUMKEYS(mp));
- node = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
+ i, DKEY(key));
+ assert(i < NUMKEYS(mp));
+ node = NODEPTR(mp, i);
- if ((rc = mdb_get_page(mc->mc_txn, NODEPGNO(node), &mp)))
+ if ((rc = mdb_page_get(mc->mc_txn, NODEPGNO(node), &mp)))
return rc;
- if ((rc = cursor_push_page(mc, mp)))
+ mc->mc_ki[mc->mc_top] = i;
+ if ((rc = mdb_cursor_push(mc, mp)))
return rc;
if (modify) {
- if ((rc = mdb_touch(mc)) != 0)
+ if ((rc = mdb_page_touch(mc)) != 0)
return rc;
mp = mc->mc_pg[mc->mc_top];
}
return MDB_CORRUPTED;
}
- DPRINTF("found leaf page %lu for key [%s]", mp->mp_pgno,
+ DPRINTF("found leaf page %zu for key [%s]", mp->mp_pgno,
key ? DKEY(key) : NULL);
return MDB_SUCCESS;
}
-/* Search for the page a given key should be in.
- * Pushes parent pages on the cursor stack.
- * If key is NULL, search for the lowest page (used by mdb_cursor_first).
- * If modify is true, visited pages are updated with new page numbers.
+/** Search for the page a given key should be in.
+ * Pushes parent pages on the cursor stack. This function just sets up
+ * the search; it finds the root page for \b mc's database and sets this
+ * as the root of the cursor's stack. Then #mdb_page_search_root() is
+ * called to complete the search.
+ * @param[in,out] mc the cursor for this operation.
+ * @param[in] key the key to search for. If NULL, search for the lowest
+ * page. (This is used by #mdb_cursor_first().)
+ * @param[in] modify If true, visited pages are updated with new page numbers.
+ * @return 0 on success, non-zero on failure.
*/
static int
-mdb_search_page(MDB_cursor *mc, MDB_val *key, int modify)
+mdb_page_search(MDB_cursor *mc, MDB_val *key, int modify)
{
int rc;
pgno_t root;
if (F_ISSET(mc->mc_txn->mt_flags, MDB_TXN_ERROR)) {
DPUTS("transaction has failed, must abort");
return EINVAL;
- } else
- root = mc->mc_txn->mt_dbs[mc->mc_dbi].md_root;
+ } else {
+ /* Make sure we're using an up-to-date root */
+ if (mc->mc_dbi > MAIN_DBI) {
+ if ((*mc->mc_dbflag & DB_STALE) ||
+ (modify && !(*mc->mc_dbflag & DB_DIRTY))) {
+ MDB_cursor mc2;
+ unsigned char dbflag = 0;
+ mdb_cursor_init(&mc2, mc->mc_txn, MAIN_DBI, NULL);
+ rc = mdb_page_search(&mc2, &mc->mc_dbx->md_name, modify);
+ if (rc)
+ return rc;
+ if (*mc->mc_dbflag & DB_STALE) {
+ MDB_val data;
+ int exact = 0;
+ MDB_node *leaf = mdb_node_search(&mc2,
+ &mc->mc_dbx->md_name, &exact);
+ if (!exact)
+ return MDB_NOTFOUND;
+ mdb_node_read(mc->mc_txn, leaf, &data);
+ memcpy(mc->mc_db, data.mv_data, sizeof(MDB_db));
+ }
+ if (modify)
+ dbflag = DB_DIRTY;
+ *mc->mc_dbflag = dbflag;
+ }
+ }
+ root = mc->mc_db->md_root;
- if (root == P_INVALID) { /* Tree is empty. */
- DPUTS("tree is empty");
- return MDB_NOTFOUND;
+ if (root == P_INVALID) { /* Tree is empty. */
+ DPUTS("tree is empty");
+ return MDB_NOTFOUND;
+ }
}
- if ((rc = mdb_get_page(mc->mc_txn, root, &mc->mc_pg[0])))
+ assert(root > 1);
+ if ((rc = mdb_page_get(mc->mc_txn, root, &mc->mc_pg[0])))
return rc;
mc->mc_snum = 1;
mc->mc_top = 0;
- DPRINTF("db %u root page %lu has flags 0x%X",
+ DPRINTF("db %u root page %zu has flags 0x%X",
mc->mc_dbi, root, mc->mc_pg[0]->mp_flags);
if (modify) {
- /* For sub-databases, update main root first */
- if (mc->mc_dbi > MAIN_DBI && !mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty) {
- MDB_cursor mc2;
- mc2.mc_txn = mc->mc_txn;
- mc2.mc_dbi = MAIN_DBI;
- rc = mdb_search_page(&mc2, &mc->mc_txn->mt_dbxs[mc->mc_dbi].md_name, 1);
- if (rc)
- return rc;
- mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty = 1;
- }
- if (!F_ISSET(mc->mc_pg[0]->mp_flags, P_DIRTY)) {
- if ((rc = mdb_touch(mc)))
- return rc;
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = mc->mc_pg[0]->mp_pgno;
- }
+ if ((rc = mdb_page_touch(mc)))
+ return rc;
}
- return mdb_search_page_root(mc, key, modify);
+ return mdb_page_search_root(mc, key, modify);
}
+/** Return the data associated with a given node.
+ * @param[in] txn The transaction for this operation.
+ * @param[in] leaf The node being read.
+ * @param[out] data Updated to point to the node's data.
+ * @return 0 on success, non-zero on failure.
+ */
static int
-mdb_read_data(MDB_txn *txn, MDB_node *leaf, MDB_val *data)
+mdb_node_read(MDB_txn *txn, MDB_node *leaf, MDB_val *data)
{
- MDB_page *omp; /* overflow mpage */
+ MDB_page *omp; /* overflow page */
pgno_t pgno;
int rc;
*/
data->mv_size = NODEDSZ(leaf);
memcpy(&pgno, NODEDATA(leaf), sizeof(pgno));
- if ((rc = mdb_get_page(txn, pgno, &omp))) {
- DPRINTF("read overflow page %lu failed", pgno);
+ if ((rc = mdb_page_get(txn, pgno, &omp))) {
+ DPRINTF("read overflow page %zu failed", pgno);
return rc;
}
data->mv_data = METADATA(omp);
return EINVAL;
}
- mc.mc_txn = txn;
- mc.mc_dbi = dbi;
- mc.mc_flags = 0;
- if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
- mc.mc_xcursor = &mx;
- mdb_xcursor_init0(&mc);
- } else {
- mc.mc_xcursor = NULL;
- }
+ mdb_cursor_init(&mc, txn, dbi, &mx);
return mdb_cursor_set(&mc, key, data, MDB_SET, &exact);
}
+/** Find a sibling for a page.
+ * Replaces the page at the top of the cursor's stack with the
+ * specified sibling, if one exists.
+ * @param[in] mc The cursor for this operation.
+ * @param[in] move_right Non-zero if the right sibling is requested,
+ * otherwise the left sibling.
+ * @return 0 on success, non-zero on failure.
+ */
static int
-mdb_sibling(MDB_cursor *mc, int move_right)
+mdb_cursor_sibling(MDB_cursor *mc, int move_right)
{
int rc;
- unsigned int ptop;
MDB_node *indx;
MDB_page *mp;
if (mc->mc_snum < 2) {
return MDB_NOTFOUND; /* root has no siblings */
}
- ptop = mc->mc_top-1;
- DPRINTF("parent page is page %lu, index %u",
- mc->mc_pg[ptop]->mp_pgno, mc->mc_ki[ptop]);
+ mdb_cursor_pop(mc);
+ DPRINTF("parent page is page %zu, index %u",
+ mc->mc_pg[mc->mc_top]->mp_pgno, mc->mc_ki[mc->mc_top]);
- cursor_pop_page(mc);
- if (move_right ? (mc->mc_ki[ptop] + 1u >= NUMKEYS(mc->mc_pg[ptop]))
- : (mc->mc_ki[ptop] == 0)) {
+ if (move_right ? (mc->mc_ki[mc->mc_top] + 1u >= NUMKEYS(mc->mc_pg[mc->mc_top]))
+ : (mc->mc_ki[mc->mc_top] == 0)) {
DPRINTF("no more keys left, moving to %s sibling",
move_right ? "right" : "left");
- if ((rc = mdb_sibling(mc, move_right)) != MDB_SUCCESS)
+ if ((rc = mdb_cursor_sibling(mc, move_right)) != MDB_SUCCESS)
return rc;
} else {
if (move_right)
- mc->mc_ki[ptop]++;
+ mc->mc_ki[mc->mc_top]++;
else
- mc->mc_ki[ptop]--;
+ mc->mc_ki[mc->mc_top]--;
DPRINTF("just moving to %s index key %u",
- move_right ? "right" : "left", mc->mc_ki[ptop]);
+ move_right ? "right" : "left", mc->mc_ki[mc->mc_top]);
}
- assert(IS_BRANCH(mc->mc_pg[ptop]));
+ assert(IS_BRANCH(mc->mc_pg[mc->mc_top]));
- indx = NODEPTR(mc->mc_pg[ptop], mc->mc_ki[ptop]);
- if ((rc = mdb_get_page(mc->mc_txn, NODEPGNO(indx), &mp)))
+ indx = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
+ if ((rc = mdb_page_get(mc->mc_txn, NODEPGNO(indx), &mp)))
return rc;;
- cursor_push_page(mc, mp);
+ mdb_cursor_push(mc, mp);
return MDB_SUCCESS;
}
+/** Move the cursor to the next data item. */
static int
mdb_cursor_next(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op)
{
mp = mc->mc_pg[mc->mc_top];
- if (mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPSORT) {
+ if (mc->mc_db->md_flags & MDB_DUPSORT) {
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
if (op == MDB_NEXT || op == MDB_NEXT_DUP) {
return rc;
}
} else {
- mc->mc_xcursor->mx_cursor.mc_flags = 0;
+ mc->mc_xcursor->mx_cursor.mc_flags &= ~C_INITIALIZED;
if (op == MDB_NEXT_DUP)
return MDB_NOTFOUND;
}
}
- DPRINTF("cursor_next: top page is %lu in cursor %p", mp->mp_pgno, (void *) mc);
+ DPRINTF("cursor_next: top page is %zu in cursor %p", mp->mp_pgno, (void *) mc);
if (mc->mc_ki[mc->mc_top] + 1u >= NUMKEYS(mp)) {
DPUTS("=====> move to next sibling page");
- if (mdb_sibling(mc, 1) != MDB_SUCCESS) {
+ if (mdb_cursor_sibling(mc, 1) != MDB_SUCCESS) {
mc->mc_flags |= C_EOF;
+ mc->mc_flags &= ~C_INITIALIZED;
return MDB_NOTFOUND;
}
mp = mc->mc_pg[mc->mc_top];
- DPRINTF("next page is %lu, key index %u", mp->mp_pgno, mc->mc_ki[mc->mc_top]);
+ DPRINTF("next page is %zu, key index %u", mp->mp_pgno, mc->mc_ki[mc->mc_top]);
} else
mc->mc_ki[mc->mc_top]++;
- DPRINTF("==> cursor points to page %lu with %u keys, key index %u",
+ DPRINTF("==> cursor points to page %zu with %u keys, key index %u",
mp->mp_pgno, NUMKEYS(mp), mc->mc_ki[mc->mc_top]);
if (IS_LEAF2(mp)) {
- key->mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
+ key->mv_size = mc->mc_db->md_pad;
key->mv_data = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->mv_size);
return MDB_SUCCESS;
}
mdb_xcursor_init1(mc, leaf);
}
if (data) {
- if ((rc = mdb_read_data(mc->mc_txn, leaf, data) != MDB_SUCCESS))
+ if ((rc = mdb_node_read(mc->mc_txn, leaf, data) != MDB_SUCCESS))
return rc;
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
return MDB_SUCCESS;
}
+/** Move the cursor to the previous data item. */
static int
mdb_cursor_prev(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op)
{
mp = mc->mc_pg[mc->mc_top];
- if (mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPSORT) {
+ if (mc->mc_db->md_flags & MDB_DUPSORT) {
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
if (op == MDB_PREV || op == MDB_PREV_DUP) {
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
if (op != MDB_PREV || rc == MDB_SUCCESS)
return rc;
} else {
- mc->mc_xcursor->mx_cursor.mc_flags = 0;
+ mc->mc_xcursor->mx_cursor.mc_flags &= ~C_INITIALIZED;
if (op == MDB_PREV_DUP)
return MDB_NOTFOUND;
}
}
}
- DPRINTF("cursor_prev: top page is %lu in cursor %p", mp->mp_pgno, (void *) mc);
+ DPRINTF("cursor_prev: top page is %zu in cursor %p", mp->mp_pgno, (void *) mc);
if (mc->mc_ki[mc->mc_top] == 0) {
DPUTS("=====> move to prev sibling page");
- if (mdb_sibling(mc, 0) != MDB_SUCCESS) {
+ if (mdb_cursor_sibling(mc, 0) != MDB_SUCCESS) {
mc->mc_flags &= ~C_INITIALIZED;
return MDB_NOTFOUND;
}
mp = mc->mc_pg[mc->mc_top];
mc->mc_ki[mc->mc_top] = NUMKEYS(mp) - 1;
- DPRINTF("prev page is %lu, key index %u", mp->mp_pgno, mc->mc_ki[mc->mc_top]);
+ DPRINTF("prev page is %zu, key index %u", mp->mp_pgno, mc->mc_ki[mc->mc_top]);
} else
mc->mc_ki[mc->mc_top]--;
mc->mc_flags &= ~C_EOF;
- DPRINTF("==> cursor points to page %lu with %u keys, key index %u",
+ DPRINTF("==> cursor points to page %zu with %u keys, key index %u",
mp->mp_pgno, NUMKEYS(mp), mc->mc_ki[mc->mc_top]);
if (IS_LEAF2(mp)) {
- key->mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
+ key->mv_size = mc->mc_db->md_pad;
key->mv_data = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->mv_size);
return MDB_SUCCESS;
}
mdb_xcursor_init1(mc, leaf);
}
if (data) {
- if ((rc = mdb_read_data(mc->mc_txn, leaf, data) != MDB_SUCCESS))
+ if ((rc = mdb_node_read(mc->mc_txn, leaf, data) != MDB_SUCCESS))
return rc;
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
return MDB_SUCCESS;
}
+/** Set the cursor on a specific data item. */
static int
mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data,
MDB_cursor_op op, int *exactp)
{
int rc;
+ MDB_page *mp;
MDB_node *leaf;
DKBUF;
if (mc->mc_flags & C_INITIALIZED) {
MDB_val nodekey;
- if (mc->mc_pg[mc->mc_top]->mp_flags & P_LEAF2) {
- nodekey.mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
- nodekey.mv_data = LEAF2KEY(mc->mc_pg[mc->mc_top], 0, nodekey.mv_size);
+ mp = mc->mc_pg[mc->mc_top];
+ if (!NUMKEYS(mp)) {
+ mc->mc_ki[mc->mc_top] = 0;
+ return MDB_NOTFOUND;
+ }
+ if (mp->mp_flags & P_LEAF2) {
+ nodekey.mv_size = mc->mc_db->md_pad;
+ nodekey.mv_data = LEAF2KEY(mp, 0, nodekey.mv_size);
} else {
- leaf = NODEPTR(mc->mc_pg[mc->mc_top], 0);
+ leaf = NODEPTR(mp, 0);
MDB_SET_KEY(leaf, &nodekey);
}
- rc = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_cmp(key, &nodekey);
+ rc = mc->mc_dbx->md_cmp(key, &nodekey);
if (rc == 0) {
/* Probably happens rarely, but first node on the page
* was the one we wanted.
*/
mc->mc_ki[mc->mc_top] = 0;
-set1:
+ leaf = NODEPTR(mp, 0);
if (exactp)
*exactp = 1;
- leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
- goto set3;
+ goto set1;
}
if (rc > 0) {
unsigned int i;
- if (NUMKEYS(mc->mc_pg[mc->mc_top]) > 1) {
- if (mc->mc_pg[mc->mc_top]->mp_flags & P_LEAF2) {
- nodekey.mv_data = LEAF2KEY(mc->mc_pg[mc->mc_top],
- NUMKEYS(mc->mc_pg[mc->mc_top])-1, nodekey.mv_size);
+ unsigned int nkeys = NUMKEYS(mp);
+ if (nkeys > 1) {
+ if (mp->mp_flags & P_LEAF2) {
+ nodekey.mv_data = LEAF2KEY(mp,
+ nkeys-1, nodekey.mv_size);
} else {
- leaf = NODEPTR(mc->mc_pg[mc->mc_top], NUMKEYS(mc->mc_pg[mc->mc_top])-1);
+ leaf = NODEPTR(mp, nkeys-1);
MDB_SET_KEY(leaf, &nodekey);
}
- rc = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_cmp(key, &nodekey);
+ rc = mc->mc_dbx->md_cmp(key, &nodekey);
if (rc == 0) {
/* last node was the one we wanted */
- mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top])-1;
+ mc->mc_ki[mc->mc_top] = nkeys-1;
+ leaf = NODEPTR(mp, nkeys-1);
+ if (exactp)
+ *exactp = 1;
goto set1;
}
if (rc < 0) {
break;
if (i == mc->mc_top) {
/* There are no other pages */
- mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top]);
+ mc->mc_ki[mc->mc_top] = nkeys;
return MDB_NOTFOUND;
}
}
+ if (!mc->mc_top) {
+ /* There are no other pages */
+ mc->mc_ki[mc->mc_top] = 0;
+ return MDB_NOTFOUND;
+ }
}
- rc = mdb_search_page(mc, key, 0);
+ rc = mdb_page_search(mc, key, 0);
if (rc != MDB_SUCCESS)
return rc;
- assert(IS_LEAF(mc->mc_pg[mc->mc_top]));
+ mp = mc->mc_pg[mc->mc_top];
+ assert(IS_LEAF(mp));
set2:
- leaf = mdb_search_node(mc, key, exactp);
+ leaf = mdb_node_search(mc, key, exactp);
if (exactp != NULL && !*exactp) {
/* MDB_SET specified and not an exact match. */
return MDB_NOTFOUND;
if (leaf == NULL) {
DPUTS("===> inexact leaf not found, goto sibling");
- if ((rc = mdb_sibling(mc, 1)) != MDB_SUCCESS)
+ if ((rc = mdb_cursor_sibling(mc, 1)) != MDB_SUCCESS)
return rc; /* no entries matched */
- mc->mc_ki[mc->mc_top] = 0;
- assert(IS_LEAF(mc->mc_pg[mc->mc_top]));
- leaf = NODEPTR(mc->mc_pg[mc->mc_top], 0);
+ mp = mc->mc_pg[mc->mc_top];
+ assert(IS_LEAF(mp));
+ leaf = NODEPTR(mp, 0);
}
-set3:
+set1:
mc->mc_flags |= C_INITIALIZED;
mc->mc_flags &= ~C_EOF;
- if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
- key->mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
- key->mv_data = LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], key->mv_size);
+ if (IS_LEAF2(mp)) {
+ key->mv_size = mc->mc_db->md_pad;
+ key->mv_data = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->mv_size);
return MDB_SUCCESS;
}
}
} else if (op == MDB_GET_BOTH || op == MDB_GET_BOTH_RANGE) {
MDB_val d2;
- if ((rc = mdb_read_data(mc->mc_txn, leaf, &d2)) != MDB_SUCCESS)
+ if ((rc = mdb_node_read(mc->mc_txn, leaf, &d2)) != MDB_SUCCESS)
return rc;
- rc = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dcmp(data, &d2);
+ rc = mc->mc_dbx->md_dcmp(data, &d2);
if (rc) {
if (op == MDB_GET_BOTH || rc > 0)
return MDB_NOTFOUND;
}
} else {
- if ((rc = mdb_read_data(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
+ if (mc->mc_xcursor)
+ mc->mc_xcursor->mx_cursor.mc_flags &= ~C_INITIALIZED;
+ if ((rc = mdb_node_read(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
return rc;
}
}
return rc;
}
+/** Move the cursor to the first item in the database. */
static int
mdb_cursor_first(MDB_cursor *mc, MDB_val *key, MDB_val *data)
{
int rc;
MDB_node *leaf;
- rc = mdb_search_page(mc, NULL, 0);
- if (rc != MDB_SUCCESS)
- return rc;
+ if (!(mc->mc_flags & C_INITIALIZED) || mc->mc_top) {
+ rc = mdb_page_search(mc, NULL, 0);
+ if (rc != MDB_SUCCESS)
+ return rc;
+ }
assert(IS_LEAF(mc->mc_pg[mc->mc_top]));
leaf = NODEPTR(mc->mc_pg[mc->mc_top], 0);
mc->mc_flags |= C_INITIALIZED;
mc->mc_flags &= ~C_EOF;
+ mc->mc_ki[mc->mc_top] = 0;
+
if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
- key->mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
+ key->mv_size = mc->mc_db->md_pad;
key->mv_data = LEAF2KEY(mc->mc_pg[mc->mc_top], 0, key->mv_size);
return MDB_SUCCESS;
}
return rc;
} else {
if (mc->mc_xcursor)
- mc->mc_xcursor->mx_cursor.mc_flags = 0;
- if ((rc = mdb_read_data(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
+ mc->mc_xcursor->mx_cursor.mc_flags &= ~C_INITIALIZED;
+ if ((rc = mdb_node_read(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
return rc;
}
}
return MDB_SUCCESS;
}
+/** Move the cursor to the last item in the database. */
static int
mdb_cursor_last(MDB_cursor *mc, MDB_val *key, MDB_val *data)
{
lkey.mv_size = MAXKEYSIZE+1;
lkey.mv_data = NULL;
- rc = mdb_search_page(mc, &lkey, 0);
- if (rc != MDB_SUCCESS)
- return rc;
+ if (!(mc->mc_flags & C_INITIALIZED) || mc->mc_top) {
+ rc = mdb_page_search(mc, &lkey, 0);
+ if (rc != MDB_SUCCESS)
+ return rc;
+ }
assert(IS_LEAF(mc->mc_pg[mc->mc_top]));
leaf = NODEPTR(mc->mc_pg[mc->mc_top], NUMKEYS(mc->mc_pg[mc->mc_top])-1);
mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top]) - 1;
if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
- key->mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
+ key->mv_size = mc->mc_db->md_pad;
key->mv_data = LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], key->mv_size);
return MDB_SUCCESS;
}
if (rc)
return rc;
} else {
- if ((rc = mdb_read_data(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
+ if (mc->mc_xcursor)
+ mc->mc_xcursor->mx_cursor.mc_flags &= ~C_INITIALIZED;
+ if ((rc = mdb_node_read(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
return rc;
}
}
break;
case MDB_GET_MULTIPLE:
if (data == NULL ||
- !(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPFIXED) ||
+ !(mc->mc_db->md_flags & MDB_DUPFIXED) ||
!(mc->mc_flags & C_INITIALIZED)) {
rc = EINVAL;
break;
goto fetchm;
case MDB_NEXT_MULTIPLE:
if (data == NULL ||
- !(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPFIXED)) {
+ !(mc->mc_db->md_flags & MDB_DUPFIXED)) {
rc = EINVAL;
break;
}
fetchm:
mx = &mc->mc_xcursor->mx_cursor;
data->mv_size = NUMKEYS(mx->mc_pg[mx->mc_top]) *
- mx->mc_txn->mt_dbs[mx->mc_dbi].md_pad;
+ mx->mc_db->md_pad;
data->mv_data = METADATA(mx->mc_pg[mx->mc_top]);
mx->mc_ki[mx->mc_top] = NUMKEYS(mx->mc_pg[mx->mc_top])-1;
} else {
break;
case MDB_FIRST_DUP:
if (data == NULL ||
- !(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPSORT) ||
+ !(mc->mc_db->md_flags & MDB_DUPSORT) ||
!(mc->mc_flags & C_INITIALIZED) ||
!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED)) {
rc = EINVAL;
break;
case MDB_LAST_DUP:
if (data == NULL ||
- !(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPSORT) ||
+ !(mc->mc_db->md_flags & MDB_DUPSORT) ||
!(mc->mc_flags & C_INITIALIZED) ||
!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED)) {
rc = EINVAL;
return rc;
}
+/** Touch all the pages in the cursor stack.
+ * Makes sure all the pages are writable, before attempting a write operation.
+ * @param[in] mc The cursor to operate on.
+ */
static int
mdb_cursor_touch(MDB_cursor *mc)
{
int rc;
- if (mc->mc_dbi > MAIN_DBI && !mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty) {
+ if (mc->mc_dbi > MAIN_DBI && !(*mc->mc_dbflag & DB_DIRTY)) {
MDB_cursor mc2;
- mc2.mc_txn = mc->mc_txn;
- mc2.mc_dbi = MAIN_DBI;
- rc = mdb_search_page(&mc2, &mc->mc_txn->mt_dbxs[mc->mc_dbi].md_name, 1);
- if (rc) return rc;
- mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty = 1;
+ mdb_cursor_init(&mc2, mc->mc_txn, MAIN_DBI, NULL);
+ rc = mdb_page_search(&mc2, &mc->mc_dbx->md_name, 1);
+ if (rc)
+ return rc;
+ *mc->mc_dbflag = DB_DIRTY;
}
for (mc->mc_top = 0; mc->mc_top < mc->mc_snum; mc->mc_top++) {
- if (!F_ISSET(mc->mc_pg[mc->mc_top]->mp_flags, P_DIRTY)) {
- rc = mdb_touch(mc);
- if (rc) return rc;
- if (!mc->mc_top) {
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_root =
- mc->mc_pg[mc->mc_top]->mp_pgno;
- }
- }
+ rc = mdb_page_touch(mc);
+ if (rc)
+ return rc;
}
mc->mc_top = mc->mc_snum-1;
return MDB_SUCCESS;
mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
unsigned int flags)
{
- MDB_node *leaf;
+ MDB_node *leaf = NULL;
MDB_val xdata, *rdata, dkey;
+ MDB_page *fp;
MDB_db dummy;
- char dbuf[PAGESIZE];
int do_sub = 0;
+ unsigned int mcount = 0;
size_t nsize;
- DKBUF;
int rc, rc2;
+ MDB_pagebuf pbuf;
+ char dbuf[MAXKEYSIZE+1];
+ unsigned int nflags;
+ DKBUF;
if (F_ISSET(mc->mc_txn->mt_flags, MDB_TXN_RDONLY))
return EACCES;
DPRINTF("==> put db %u key [%s], size %zu, data size %zu",
- mc->mc_dbi, DKEY(key), key->mv_size, data->mv_size);
+ mc->mc_dbi, DKEY(key), key ? key->mv_size:0, data->mv_size);
dkey.mv_size = 0;
if (!(mc->mc_flags & C_INITIALIZED))
return EINVAL;
rc = MDB_SUCCESS;
- } else if (mc->mc_txn->mt_dbs[mc->mc_dbi].md_root == P_INVALID) {
+ } else if (mc->mc_db->md_root == P_INVALID) {
MDB_page *np;
/* new database, write a root leaf page */
DPUTS("allocating new root leaf page");
- if ((np = mdb_new_page(mc, P_LEAF, 1)) == NULL) {
+ if ((np = mdb_page_new(mc, P_LEAF, 1)) == NULL) {
return ENOMEM;
}
mc->mc_snum = 0;
- cursor_push_page(mc, np);
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = np->mp_pgno;
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_depth++;
- mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty = 1;
- if ((mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & (MDB_DUPSORT|MDB_DUPFIXED))
+ mdb_cursor_push(mc, np);
+ mc->mc_db->md_root = np->mp_pgno;
+ mc->mc_db->md_depth++;
+ *mc->mc_dbflag = DB_DIRTY;
+ if ((mc->mc_db->md_flags & (MDB_DUPSORT|MDB_DUPFIXED))
== MDB_DUPFIXED)
np->mp_flags |= P_LEAF2;
mc->mc_flags |= C_INITIALIZED;
int exact = 0;
MDB_val d2;
rc = mdb_cursor_set(mc, key, &d2, MDB_SET, &exact);
- if (flags == MDB_NOOVERWRITE && rc == 0) {
+ if ((flags & MDB_NOOVERWRITE) && rc == 0) {
DPRINTF("duplicate key [%s]", DKEY(key));
*data = d2;
return MDB_KEYEXIST;
/* Cursor is positioned, now make sure all pages are writable */
rc2 = mdb_cursor_touch(mc);
- if (rc2) return rc2;
+ if (rc2)
+ return rc2;
top:
/* The key already exists */
if (rc == MDB_SUCCESS) {
/* there's only a key anyway, so this is a no-op */
if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
- unsigned int ksize = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
+ unsigned int ksize = mc->mc_db->md_pad;
if (key->mv_size != ksize)
return EINVAL;
if (flags == MDB_CURRENT) {
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
/* DB has dups? */
- if (F_ISSET(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags, MDB_DUPSORT)) {
+ if (F_ISSET(mc->mc_db->md_flags, MDB_DUPSORT)) {
/* Was a single item before, must convert now */
+more:
if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) {
+ /* Just overwrite the current item */
+ if (flags == MDB_CURRENT)
+ goto current;
+
dkey.mv_size = NODEDSZ(leaf);
- dkey.mv_data = dbuf;
- memcpy(dbuf, NODEDATA(leaf), dkey.mv_size);
- /* data matches, ignore it */
- if (!mdb_dcmp(mc->mc_txn, mc->mc_dbi, data, &dkey))
+ dkey.mv_data = NODEDATA(leaf);
+#if UINT_MAX < SIZE_MAX
+ if (mc->mc_dbx->md_dcmp == mdb_cmp_int && dkey.mv_size == sizeof(size_t))
+#ifdef MISALIGNED_OK
+ mc->mc_dbx->md_dcmp = mdb_cmp_long;
+#else
+ mc->mc_dbx->md_dcmp = mdb_cmp_cint;
+#endif
+#endif
+ /* if data matches, ignore it */
+ if (!mc->mc_dbx->md_dcmp(data, &dkey))
return (flags == MDB_NODUPDATA) ? MDB_KEYEXIST : MDB_SUCCESS;
- memset(&dummy, 0, sizeof(dummy));
- if (mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPFIXED) {
- dummy.md_pad = data->mv_size;
- dummy.md_flags = MDB_DUPFIXED;
- if (mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_INTEGERDUP)
- dummy.md_flags |= MDB_INTEGERKEY;
+
+ /* create a fake page for the dup items */
+ memcpy(dbuf, dkey.mv_data, dkey.mv_size);
+ dkey.mv_data = dbuf;
+ fp = (MDB_page *)&pbuf;
+ fp->mp_pgno = mc->mc_pg[mc->mc_top]->mp_pgno;
+ fp->mp_flags = P_LEAF|P_DIRTY|P_SUBP;
+ fp->mp_lower = PAGEHDRSZ;
+ fp->mp_upper = PAGEHDRSZ + dkey.mv_size + data->mv_size;
+ if (mc->mc_db->md_flags & MDB_DUPFIXED) {
+ fp->mp_flags |= P_LEAF2;
+ fp->mp_pad = data->mv_size;
+ } else {
+ fp->mp_upper += 2 * sizeof(indx_t) + 2 * NODESIZE +
+ (dkey.mv_size & 1) + (data->mv_size & 1);
}
- dummy.md_root = P_INVALID;
- if (dkey.mv_size == sizeof(MDB_db)) {
- memcpy(NODEDATA(leaf), &dummy, sizeof(dummy));
+ mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
+ do_sub = 1;
+ rdata = &xdata;
+ xdata.mv_size = fp->mp_upper;
+ xdata.mv_data = fp;
+ flags |= F_DUPDATA;
+ goto new_sub;
+ }
+ if (!F_ISSET(leaf->mn_flags, F_SUBDATA)) {
+ /* See if we need to convert from fake page to subDB */
+ MDB_page *mp;
+ unsigned int offset;
+ unsigned int i;
+
+ fp = NODEDATA(leaf);
+ if (flags == MDB_CURRENT) {
+ fp->mp_flags |= P_DIRTY;
+ COPY_PGNO(fp->mp_pgno, mc->mc_pg[mc->mc_top]->mp_pgno);
+ mc->mc_xcursor->mx_cursor.mc_pg[0] = fp;
+ flags |= F_DUPDATA;
goto put_sub;
}
- mdb_del_node(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
+ if (mc->mc_db->md_flags & MDB_DUPFIXED) {
+ offset = fp->mp_pad;
+ } else {
+ offset = NODESIZE + sizeof(indx_t) + data->mv_size;
+ }
+ offset += offset & 1;
+ if (NODESIZE + sizeof(indx_t) + NODEKSZ(leaf) + NODEDSZ(leaf) +
+ offset >= (mc->mc_txn->mt_env->me_psize - PAGEHDRSZ) /
+ MDB_MINKEYS) {
+ /* yes, convert it */
+ dummy.md_flags = 0;
+ if (mc->mc_db->md_flags & MDB_DUPFIXED) {
+ dummy.md_pad = fp->mp_pad;
+ dummy.md_flags = MDB_DUPFIXED;
+ if (mc->mc_db->md_flags & MDB_INTEGERDUP)
+ dummy.md_flags |= MDB_INTEGERKEY;
+ }
+ dummy.md_depth = 1;
+ dummy.md_branch_pages = 0;
+ dummy.md_leaf_pages = 1;
+ dummy.md_overflow_pages = 0;
+ dummy.md_entries = NUMKEYS(fp);
+ rdata = &xdata;
+ xdata.mv_size = sizeof(MDB_db);
+ xdata.mv_data = &dummy;
+ mp = mdb_page_alloc(mc, 1);
+ if (!mp)
+ return ENOMEM;
+ offset = mc->mc_txn->mt_env->me_psize - NODEDSZ(leaf);
+ flags |= F_DUPDATA|F_SUBDATA;
+ dummy.md_root = mp->mp_pgno;
+ } else {
+ /* no, just grow it */
+ rdata = &xdata;
+ xdata.mv_size = NODEDSZ(leaf) + offset;
+ xdata.mv_data = &pbuf;
+ mp = (MDB_page *)&pbuf;
+ mp->mp_pgno = mc->mc_pg[mc->mc_top]->mp_pgno;
+ flags |= F_DUPDATA;
+ }
+ mp->mp_flags = fp->mp_flags | P_DIRTY;
+ mp->mp_pad = fp->mp_pad;
+ mp->mp_lower = fp->mp_lower;
+ mp->mp_upper = fp->mp_upper + offset;
+ if (IS_LEAF2(fp)) {
+ memcpy(METADATA(mp), METADATA(fp), NUMKEYS(fp) * fp->mp_pad);
+ } else {
+ nsize = NODEDSZ(leaf) - fp->mp_upper;
+ memcpy((char *)mp + mp->mp_upper, (char *)fp + fp->mp_upper, nsize);
+ for (i=0; i<NUMKEYS(fp); i++)
+ mp->mp_ptrs[i] = fp->mp_ptrs[i] + offset;
+ }
+ mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
do_sub = 1;
- rdata = &xdata;
- xdata.mv_size = sizeof(MDB_db);
- xdata.mv_data = &dummy;
- /* new sub-DB, must fully init xcursor */
- if (flags == MDB_CURRENT)
- flags = 0;
goto new_sub;
}
+ /* data is on sub-DB, just store it */
+ flags |= F_DUPDATA|F_SUBDATA;
goto put_sub;
}
- /* same size, just replace it */
- if (!F_ISSET(leaf->mn_flags, F_BIGDATA) &&
- NODEDSZ(leaf) == data->mv_size) {
- memcpy(NODEDATA(leaf), data->mv_data, data->mv_size);
+current:
+ /* overflow page overwrites need special handling */
+ if (F_ISSET(leaf->mn_flags, F_BIGDATA)) {
+ MDB_page *omp;
+ pgno_t pg;
+ int ovpages, dpages;
+
+ ovpages = OVPAGES(NODEDSZ(leaf), mc->mc_txn->mt_env->me_psize);
+ dpages = OVPAGES(data->mv_size, mc->mc_txn->mt_env->me_psize);
+ memcpy(&pg, NODEDATA(leaf), sizeof(pg));
+ mdb_page_get(mc->mc_txn, pg, &omp);
+ /* Is the ov page writable and large enough? */
+ if ((omp->mp_flags & P_DIRTY) && ovpages >= dpages) {
+ /* yes, overwrite it. Note in this case we don't
+ * bother to try shrinking the node if the new data
+ * is smaller than the overflow threshold.
+ */
+ if (F_ISSET(flags, MDB_RESERVE))
+ data->mv_data = METADATA(omp);
+ else
+ memcpy(METADATA(omp), data->mv_data, data->mv_size);
+ goto done;
+ } else {
+ /* no, free ovpages */
+ int i;
+ mc->mc_db->md_overflow_pages -= ovpages;
+ for (i=0; i<ovpages; i++) {
+ DPRINTF("freed ov page %zu", pg);
+ mdb_midl_append(&mc->mc_txn->mt_free_pgs, pg);
+ pg++;
+ }
+ }
+ } else if (NODEDSZ(leaf) == data->mv_size) {
+ /* same size, just replace it. Note that we could
+ * also reuse this node if the new data is smaller,
+ * but instead we opt to shrink the node in that case.
+ */
+ if (F_ISSET(flags, MDB_RESERVE))
+ data->mv_data = NODEDATA(leaf);
+ else
+ memcpy(NODEDATA(leaf), data->mv_data, data->mv_size);
goto done;
}
- mdb_del_node(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
+ mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
+ mc->mc_db->md_entries--;
} else {
DPRINTF("inserting key at index %i", mc->mc_ki[mc->mc_top]);
}
rdata = data;
new_sub:
+ nflags = flags & NODE_ADD_FLAGS;
nsize = IS_LEAF2(mc->mc_pg[mc->mc_top]) ? key->mv_size : mdb_leaf_size(mc->mc_txn->mt_env, key, rdata);
if (SIZELEFT(mc->mc_pg[mc->mc_top]) < nsize) {
- rc = mdb_split(mc, key, rdata, P_INVALID);
+ if (( flags & (F_DUPDATA|F_SUBDATA)) == F_DUPDATA )
+ nflags &= ~MDB_APPEND;
+ rc = mdb_page_split(mc, key, rdata, P_INVALID, nflags);
} else {
/* There is room already in this leaf page. */
- rc = mdb_add_node(mc, mc->mc_ki[mc->mc_top], key, rdata, 0, 0);
+ rc = mdb_node_add(mc, mc->mc_ki[mc->mc_top], key, rdata, 0, nflags);
+ if (rc == 0 && !do_sub) {
+ /* Adjust other cursors pointing to mp */
+ MDB_cursor *m2, *m3;
+ MDB_dbi dbi = mc->mc_dbi;
+ unsigned i = mc->mc_top;
+ MDB_page *mp = mc->mc_pg[i];
+
+ if (mc->mc_flags & C_SUB)
+ dbi--;
+
+ for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
+ if (mc->mc_flags & C_SUB)
+ m3 = &m2->mc_xcursor->mx_cursor;
+ else
+ m3 = m2;
+ if (m3 == mc || m3->mc_snum < mc->mc_snum) continue;
+ if (m3->mc_pg[i] == mp && m3->mc_ki[i] >= mc->mc_ki[i]) {
+ m3->mc_ki[i]++;
+ }
+ }
+ }
}
if (rc != MDB_SUCCESS)
mc->mc_txn->mt_flags |= MDB_TXN_ERROR;
else {
- /* Remember if we just added a subdatabase */
- if (flags & F_SUBDATA) {
- leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
- leaf->mn_flags |= F_SUBDATA;
- }
-
/* Now store the actual data in the child DB. Note that we're
* storing the user data in the keys field, so there are strict
* size limits on dupdata. The actual data fields of the child
* DB are all zero size.
*/
if (do_sub) {
- leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
+ int xflags;
put_sub:
- if (flags == MDB_CURRENT)
- mdb_xcursor_init2(mc);
- else
- mdb_xcursor_init1(mc, leaf);
xdata.mv_size = 0;
xdata.mv_data = "";
- if (flags == MDB_NODUPDATA)
- flags = MDB_NOOVERWRITE;
+ leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
+ if (flags & MDB_CURRENT) {
+ xflags = MDB_CURRENT;
+ } else {
+ mdb_xcursor_init1(mc, leaf);
+ xflags = (flags & MDB_NODUPDATA) ? MDB_NOOVERWRITE : 0;
+ }
/* converted, write the original data first */
if (dkey.mv_size) {
- rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, &dkey, &xdata, flags);
- if (rc) return rc;
- leaf->mn_flags |= F_DUPDATA;
+ rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, &dkey, &xdata, xflags);
+ if (rc)
+ return rc;
+ {
+ /* Adjust other cursors pointing to mp */
+ MDB_cursor *m2;
+ unsigned i = mc->mc_top;
+ MDB_page *mp = mc->mc_pg[i];
+
+ for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
+ if (m2 == mc || m2->mc_snum < mc->mc_snum) continue;
+ if (m2->mc_pg[i] == mp && m2->mc_ki[i] == mc->mc_ki[i]) {
+ mdb_xcursor_init1(m2, leaf);
+ }
+ }
+ }
+ }
+ xflags |= (flags & MDB_APPEND);
+ rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, data, &xdata, xflags);
+ if (flags & F_SUBDATA) {
+ void *db = NODEDATA(leaf);
+ memcpy(db, &mc->mc_xcursor->mx_db, sizeof(MDB_db));
+ }
+ }
+ /* sub-writes might have failed so check rc again.
+ * Don't increment count if we just replaced an existing item.
+ */
+ if (!rc && !(flags & MDB_CURRENT))
+ mc->mc_db->md_entries++;
+ if (flags & MDB_MULTIPLE) {
+ mcount++;
+ if (mcount < data[1].mv_size) {
+ data[0].mv_data = (char *)data[0].mv_data + data[0].mv_size;
+ leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
+ goto more;
}
- rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, data, &xdata, flags);
- mdb_xcursor_fini(mc);
- memcpy(NODEDATA(leaf),
- &mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi],
- sizeof(MDB_db));
}
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries++;
}
done:
return rc;
return EINVAL;
rc = mdb_cursor_touch(mc);
- if (rc) return rc;
+ if (rc)
+ return rc;
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
if (!IS_LEAF2(mc->mc_pg[mc->mc_top]) && F_ISSET(leaf->mn_flags, F_DUPDATA)) {
if (flags != MDB_NODUPDATA) {
- mdb_xcursor_init2(mc);
+ if (!F_ISSET(leaf->mn_flags, F_SUBDATA)) {
+ mc->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf);
+ }
rc = mdb_cursor_del(&mc->mc_xcursor->mx_cursor, 0);
- mdb_xcursor_fini(mc);
/* If sub-DB still has entries, we're done */
- if (mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi].md_root
- != P_INVALID) {
- memcpy(NODEDATA(leaf),
- &mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi],
- sizeof(MDB_db));
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries--;
+ if (mc->mc_xcursor->mx_db.md_entries) {
+ if (leaf->mn_flags & F_SUBDATA) {
+ /* update subDB info */
+ void *db = NODEDATA(leaf);
+ memcpy(db, &mc->mc_xcursor->mx_db, sizeof(MDB_db));
+ } else {
+ /* shrink fake page */
+ mdb_node_shrink(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
+ }
+ mc->mc_db->md_entries--;
return rc;
}
/* otherwise fall thru and delete the sub-DB */
}
- /* add all the child DB's pages to the free list */
- rc = mdb_search_page(&mc->mc_xcursor->mx_cursor, NULL, 0);
- if (rc == MDB_SUCCESS) {
- MDB_node *ni;
- MDB_cursor *mx;
- unsigned int i;
-
- mx = &mc->mc_xcursor->mx_cursor;
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries -=
- mx->mc_txn->mt_dbs[mx->mc_dbi].md_entries;
-
- cursor_pop_page(mx);
- if (mx->mc_snum) {
- while (mx->mc_snum > 1) {
- for (i=0; i<NUMKEYS(mx->mc_pg[mx->mc_top]); i++) {
- pgno_t pg;
- ni = NODEPTR(mx->mc_pg[mx->mc_top], i);
- pg = NODEPGNO(ni);
- /* free it */
- mdb_midl_append(mc->mc_txn->mt_free_pgs, pg);
- }
- rc = mdb_sibling(mx, 1);
- if (rc) break;
- }
+ if (leaf->mn_flags & F_SUBDATA) {
+ /* add all the child DB's pages to the free list */
+ rc = mdb_drop0(&mc->mc_xcursor->mx_cursor, 0);
+ if (rc == MDB_SUCCESS) {
+ mc->mc_db->md_entries -=
+ mc->mc_xcursor->mx_db.md_entries;
}
- /* free it */
- mdb_midl_append(mc->mc_txn->mt_free_pgs,
- mx->mc_txn->mt_dbs[mx->mc_dbi].md_root);
}
}
- return mdb_del0(mc, leaf);
+ return mdb_cursor_del0(mc, leaf);
}
-/* Allocate a page and initialize it
+/** Allocate and initialize new pages for a database.
+ * @param[in] mc a cursor on the database being added to.
+ * @param[in] flags flags defining what type of page is being allocated.
+ * @param[in] num the number of pages to allocate. This is usually 1,
+ * unless allocating overflow pages for a large record.
+ * @return Address of a page, or NULL on failure.
*/
static MDB_page *
-mdb_new_page(MDB_cursor *mc, uint32_t flags, int num)
+mdb_page_new(MDB_cursor *mc, uint32_t flags, int num)
{
MDB_page *np;
- if ((np = mdb_alloc_page(mc, num)) == NULL)
+ if ((np = mdb_page_alloc(mc, num)) == NULL)
return NULL;
- DPRINTF("allocated new mpage %lu, page size %u",
+ DPRINTF("allocated new mpage %zu, page size %u",
np->mp_pgno, mc->mc_txn->mt_env->me_psize);
np->mp_flags = flags | P_DIRTY;
np->mp_lower = PAGEHDRSZ;
np->mp_upper = mc->mc_txn->mt_env->me_psize;
if (IS_BRANCH(np))
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_branch_pages++;
+ mc->mc_db->md_branch_pages++;
else if (IS_LEAF(np))
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_leaf_pages++;
+ mc->mc_db->md_leaf_pages++;
else if (IS_OVERFLOW(np)) {
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_overflow_pages += num;
+ mc->mc_db->md_overflow_pages += num;
np->mp_pages = num;
}
return np;
}
+/** Calculate the size of a leaf node.
+ * The size depends on the environment's page size; if a data item
+ * is too large it will be put onto an overflow page and the node
+ * size will only include the key and not the data. Sizes are always
+ * rounded up to an even number of bytes, to guarantee 2-byte alignment
+ * of the #MDB_node headers.
+ * @param[in] env The environment handle.
+ * @param[in] key The key for the node.
+ * @param[in] data The data for the node.
+ * @return The number of bytes needed to store the node.
+ */
static size_t
mdb_leaf_size(MDB_env *env, MDB_val *key, MDB_val *data)
{
size_t sz;
sz = LEAFSIZE(key, data);
- if (data->mv_size >= env->me_psize / MDB_MINKEYS) {
+ if (sz >= env->me_psize / MDB_MINKEYS) {
/* put on overflow page */
sz -= data->mv_size - sizeof(pgno_t);
}
return sz + sizeof(indx_t);
}
+/** Calculate the size of a branch node.
+ * The size should depend on the environment's page size but since
+ * we currently don't support spilling large keys onto overflow
+ * pages, it's simply the size of the #MDB_node header plus the
+ * size of the key. Sizes are always rounded up to an even number
+ * of bytes, to guarantee 2-byte alignment of the #MDB_node headers.
+ * @param[in] env The environment handle.
+ * @param[in] key The key for the node.
+ * @return The number of bytes needed to store the node.
+ */
static size_t
mdb_branch_size(MDB_env *env, MDB_val *key)
{
return sz + sizeof(indx_t);
}
+/** Add a node to the page pointed to by the cursor.
+ * @param[in] mc The cursor for this operation.
+ * @param[in] indx The index on the page where the new node should be added.
+ * @param[in] key The key for the new node.
+ * @param[in] data The data for the new node, if any.
+ * @param[in] pgno The page number, if adding a branch node.
+ * @param[in] flags Flags for the node.
+ * @return 0 on success, non-zero on failure. Possible errors are:
+ * <ul>
+ * <li>ENOMEM - failed to allocate overflow pages for the node.
+ * <li>ENOSPC - there is insufficient room in the page. This error
+ * should never happen since all callers already calculate the
+ * page's free space before calling this function.
+ * </ul>
+ */
static int
-mdb_add_node(MDB_cursor *mc, indx_t indx,
- MDB_val *key, MDB_val *data, pgno_t pgno, uint8_t flags)
+mdb_node_add(MDB_cursor *mc, indx_t indx,
+ MDB_val *key, MDB_val *data, pgno_t pgno, unsigned int flags)
{
unsigned int i;
size_t node_size = NODESIZE;
assert(mp->mp_upper >= mp->mp_lower);
- DPRINTF("add to %s page %lu index %i, data size %zu key size %zu [%s]",
+ DPRINTF("add to %s %spage %zu index %i, data size %zu key size %zu [%s]",
IS_LEAF(mp) ? "leaf" : "branch",
+ IS_SUBP(mp) ? "sub-" : "",
mp->mp_pgno, indx, data ? data->mv_size : 0,
key ? key->mv_size : 0, key ? DKEY(key) : NULL);
if (IS_LEAF2(mp)) {
/* Move higher keys up one slot. */
- int ksize = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad, dif;
+ int ksize = mc->mc_db->md_pad, dif;
char *ptr = LEAF2KEY(mp, indx, ksize);
dif = NUMKEYS(mp) - indx;
if (dif > 0)
if (F_ISSET(flags, F_BIGDATA)) {
/* Data already on overflow page. */
node_size += sizeof(pgno_t);
- } else if (data->mv_size >= mc->mc_txn->mt_env->me_psize / MDB_MINKEYS) {
+ } else if (node_size + data->mv_size >= mc->mc_txn->mt_env->me_psize / MDB_MINKEYS) {
int ovpages = OVPAGES(data->mv_size, mc->mc_txn->mt_env->me_psize);
/* Put data on overflow page. */
- DPRINTF("data size is %zu, put on overflow page",
- data->mv_size);
+ DPRINTF("data size is %zu, node would be %zu, put data on overflow page",
+ data->mv_size, node_size+data->mv_size);
node_size += sizeof(pgno_t);
- if ((ofp = mdb_new_page(mc, P_OVERFLOW, ovpages)) == NULL)
+ if ((ofp = mdb_page_new(mc, P_OVERFLOW, ovpages)) == NULL)
return ENOMEM;
- DPRINTF("allocated overflow page %lu", ofp->mp_pgno);
+ DPRINTF("allocated overflow page %zu", ofp->mp_pgno);
flags |= F_BIGDATA;
} else {
node_size += data->mv_size;
node_size += node_size & 1;
if (node_size + sizeof(indx_t) > SIZELEFT(mp)) {
- DPRINTF("not enough room in page %lu, got %u ptrs",
+ DPRINTF("not enough room in page %zu, got %u ptrs",
mp->mp_pgno, NUMKEYS(mp));
DPRINTF("upper - lower = %u - %u = %u", mp->mp_upper, mp->mp_lower,
mp->mp_upper - mp->mp_lower);
if (F_ISSET(flags, F_BIGDATA))
memcpy(node->mn_data + key->mv_size, data->mv_data,
sizeof(pgno_t));
+ else if (F_ISSET(flags, MDB_RESERVE))
+ data->mv_data = node->mn_data + key->mv_size;
else
memcpy(node->mn_data + key->mv_size, data->mv_data,
data->mv_size);
} else {
memcpy(node->mn_data + key->mv_size, &ofp->mp_pgno,
sizeof(pgno_t));
- memcpy(METADATA(ofp), data->mv_data, data->mv_size);
+ if (F_ISSET(flags, MDB_RESERVE))
+ data->mv_data = METADATA(ofp);
+ else
+ memcpy(METADATA(ofp), data->mv_data, data->mv_size);
}
}
return MDB_SUCCESS;
}
+/** 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] ksize The size of a node. Only used if the page is
+ * part of a #MDB_DUPFIXED database.
+ */
static void
-mdb_del_node(MDB_page *mp, indx_t indx, int ksize)
+mdb_node_del(MDB_page *mp, indx_t indx, int ksize)
{
unsigned int sz;
indx_t i, j, numkeys, ptr;
MDB_node *node;
char *base;
- DPRINTF("delete node %u on %s page %lu", indx,
- IS_LEAF(mp) ? "leaf" : "branch", mp->mp_pgno);
+#if MDB_DEBUG
+ {
+ pgno_t pgno;
+ COPY_PGNO(pgno, mp->mp_pgno);
+ DPRINTF("delete node %u on %s page %zu", indx,
+ IS_LEAF(mp) ? "leaf" : "branch", pgno);
+ }
+#endif
assert(indx < NUMKEYS(mp));
if (IS_LEAF2(mp)) {
mp->mp_upper += sz;
}
+/** Compact the main page after deleting a node on a subpage.
+ * @param[in] mp The main page to operate on.
+ * @param[in] indx The index of the subpage on the main page.
+ */
static void
-mdb_xcursor_init0(MDB_cursor *mc)
+mdb_node_shrink(MDB_page *mp, indx_t indx)
{
- MDB_xcursor *mx = mc->mc_xcursor;
- MDB_dbi dbn;
-
- mx->mx_txn = *mc->mc_txn;
- mx->mx_txn.mt_dbxs = mx->mx_dbxs;
- mx->mx_txn.mt_dbs = mx->mx_dbs;
- mx->mx_dbxs[0] = mc->mc_txn->mt_dbxs[0];
- mx->mx_dbxs[1] = mc->mc_txn->mt_dbxs[1];
- if (mc->mc_dbi > 1) {
- mx->mx_dbxs[2] = mc->mc_txn->mt_dbxs[mc->mc_dbi];
- dbn = 2;
+ MDB_node *node;
+ MDB_page *sp, *xp;
+ char *base;
+ int osize, nsize;
+ int delta;
+ indx_t i, numkeys, ptr;
+
+ node = NODEPTR(mp, indx);
+ sp = (MDB_page *)NODEDATA(node);
+ osize = NODEDSZ(node);
+
+ delta = sp->mp_upper - sp->mp_lower;
+ SETDSZ(node, osize - delta);
+ xp = (MDB_page *)((char *)sp + delta);
+
+ /* shift subpage upward */
+ if (IS_LEAF2(sp)) {
+ nsize = NUMKEYS(sp) * sp->mp_pad;
+ memmove(METADATA(xp), METADATA(sp), nsize);
} else {
- dbn = 1;
+ int i;
+ nsize = osize - sp->mp_upper;
+ numkeys = NUMKEYS(sp);
+ for (i=numkeys-1; i>=0; i--)
+ xp->mp_ptrs[i] = sp->mp_ptrs[i] - delta;
+ }
+ xp->mp_upper = sp->mp_lower;
+ xp->mp_lower = sp->mp_lower;
+ xp->mp_flags = sp->mp_flags;
+ xp->mp_pad = sp->mp_pad;
+ COPY_PGNO(xp->mp_pgno, mp->mp_pgno);
+
+ /* shift lower nodes upward */
+ ptr = mp->mp_ptrs[indx];
+ numkeys = NUMKEYS(mp);
+ for (i = 0; i < numkeys; i++) {
+ if (mp->mp_ptrs[i] <= ptr)
+ mp->mp_ptrs[i] += delta;
}
- mx->mx_dbxs[dbn+1].md_parent = dbn;
- mx->mx_dbxs[dbn+1].md_cmp = mx->mx_dbxs[dbn].md_dcmp;
- mx->mx_dbxs[dbn+1].md_rel = mx->mx_dbxs[dbn].md_rel;
- mx->mx_dbxs[dbn+1].md_dirty = 0;
- mx->mx_txn.mt_numdbs = dbn+2;
- mx->mx_txn.mt_u = mc->mc_txn->mt_u;
- mx->mx_cursor.mc_xcursor = NULL;
- mx->mx_cursor.mc_txn = &mx->mx_txn;
- mx->mx_cursor.mc_dbi = dbn+1;
+ base = (char *)mp + mp->mp_upper;
+ memmove(base + delta, base, ptr - mp->mp_upper + NODESIZE + NODEKSZ(node));
+ mp->mp_upper += delta;
}
+/** Initial setup of a sorted-dups cursor.
+ * Sorted duplicates are implemented as a sub-database for the given key.
+ * The duplicate data items are actually keys of the sub-database.
+ * Operations on the duplicate data items are performed using a sub-cursor
+ * initialized when the sub-database is first accessed. This function does
+ * the preliminary setup of the sub-cursor, filling in the fields that
+ * depend only on the parent DB.
+ * @param[in] mc The main cursor whose sorted-dups cursor is to be initialized.
+ */
static void
-mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
+mdb_xcursor_init0(MDB_cursor *mc)
{
- MDB_db *db = NODEDATA(node);
MDB_xcursor *mx = mc->mc_xcursor;
- MDB_dbi dbn;
- mx->mx_dbs[0] = mc->mc_txn->mt_dbs[0];
- mx->mx_dbs[1] = mc->mc_txn->mt_dbs[1];
- if (mc->mc_dbi > 1) {
- mx->mx_dbs[2] = mc->mc_txn->mt_dbs[mc->mc_dbi];
- mx->mx_dbxs[2].md_dirty = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty;
- dbn = 3;
- } else {
- dbn = 2;
- }
- DPRINTF("Sub-db %u for db %u root page %lu", dbn, mc->mc_dbi, db->md_root);
- mx->mx_dbs[dbn] = *db;
- if (F_ISSET(mc->mc_pg[mc->mc_top]->mp_flags, P_DIRTY))
- mx->mx_dbxs[dbn].md_dirty = 1;
- mx->mx_dbxs[dbn].md_name.mv_data = NODEKEY(node);
- mx->mx_dbxs[dbn].md_name.mv_size = node->mn_ksize;
- mx->mx_txn.mt_next_pgno = mc->mc_txn->mt_next_pgno;
+
+ mx->mx_cursor.mc_xcursor = NULL;
+ mx->mx_cursor.mc_txn = mc->mc_txn;
+ mx->mx_cursor.mc_db = &mx->mx_db;
+ mx->mx_cursor.mc_dbx = &mx->mx_dbx;
+ mx->mx_cursor.mc_dbi = mc->mc_dbi+1;
+ mx->mx_cursor.mc_dbflag = &mx->mx_dbflag;
mx->mx_cursor.mc_snum = 0;
- mx->mx_cursor.mc_flags = 0;
+ mx->mx_cursor.mc_top = 0;
+ mx->mx_cursor.mc_flags = C_SUB;
+ mx->mx_dbx.md_cmp = mc->mc_dbx->md_dcmp;
+ mx->mx_dbx.md_dcmp = NULL;
+ mx->mx_dbx.md_rel = mc->mc_dbx->md_rel;
}
+/** Final setup of a sorted-dups cursor.
+ * Sets up the fields that depend on the data from the main cursor.
+ * @param[in] mc The main cursor whose sorted-dups cursor is to be initialized.
+ * @param[in] node The data containing the #MDB_db record for the
+ * sorted-dup database.
+ */
static void
-mdb_xcursor_init2(MDB_cursor *mc)
+mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
{
MDB_xcursor *mx = mc->mc_xcursor;
- MDB_dbi dbn;
- mx->mx_dbs[0] = mc->mc_txn->mt_dbs[0];
- mx->mx_dbs[1] = mc->mc_txn->mt_dbs[1];
- if (mc->mc_dbi > 1) {
- mx->mx_dbs[2] = mc->mc_txn->mt_dbs[mc->mc_dbi];
- mx->mx_dbxs[2].md_dirty = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty;
- dbn = 3;
+
+ if (node->mn_flags & F_SUBDATA) {
+ memcpy(&mx->mx_db, NODEDATA(node), sizeof(MDB_db));
+ mx->mx_cursor.mc_snum = 0;
+ mx->mx_cursor.mc_flags = C_SUB;
} else {
- dbn = 2;
+ MDB_page *fp = NODEDATA(node);
+ mx->mx_db.md_pad = mc->mc_pg[mc->mc_top]->mp_pad;
+ mx->mx_db.md_flags = 0;
+ mx->mx_db.md_depth = 1;
+ mx->mx_db.md_branch_pages = 0;
+ mx->mx_db.md_leaf_pages = 1;
+ mx->mx_db.md_overflow_pages = 0;
+ mx->mx_db.md_entries = NUMKEYS(fp);
+ COPY_PGNO(mx->mx_db.md_root, fp->mp_pgno);
+ mx->mx_cursor.mc_snum = 1;
+ mx->mx_cursor.mc_flags = C_INITIALIZED|C_SUB;
+ mx->mx_cursor.mc_top = 0;
+ mx->mx_cursor.mc_pg[0] = fp;
+ mx->mx_cursor.mc_ki[0] = 0;
+ if (mc->mc_db->md_flags & MDB_DUPFIXED) {
+ mx->mx_db.md_flags = MDB_DUPFIXED;
+ mx->mx_db.md_pad = fp->mp_pad;
+ if (mc->mc_db->md_flags & MDB_INTEGERDUP)
+ mx->mx_db.md_flags |= MDB_INTEGERKEY;
+ }
}
- DPRINTF("Sub-db %u for db %u root page %lu", dbn, mc->mc_dbi,
- mx->mx_dbs[dbn].md_root);
- mx->mx_txn.mt_next_pgno = mc->mc_txn->mt_next_pgno;
+ DPRINTF("Sub-db %u for db %u root page %zu", mx->mx_cursor.mc_dbi, mc->mc_dbi,
+ mx->mx_db.md_root);
+ mx->mx_dbflag = (F_ISSET(mc->mc_pg[mc->mc_top]->mp_flags, P_DIRTY)) ?
+ DB_DIRTY : 0;
+ mx->mx_dbx.md_name.mv_data = NODEKEY(node);
+ mx->mx_dbx.md_name.mv_size = node->mn_ksize;
+#if UINT_MAX < SIZE_MAX
+ if (mx->mx_dbx.md_cmp == mdb_cmp_int && mx->mx_db.md_pad == sizeof(size_t))
+#ifdef MISALIGNED_OK
+ mx->mx_dbx.md_cmp = mdb_cmp_long;
+#else
+ mx->mx_dbx.md_cmp = mdb_cmp_cint;
+#endif
+#endif
}
+/** Initialize a cursor for a given transaction and database. */
static void
-mdb_xcursor_fini(MDB_cursor *mc)
+mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx)
{
- MDB_xcursor *mx = mc->mc_xcursor;
- mc->mc_txn->mt_next_pgno = mx->mx_txn.mt_next_pgno;
- mc->mc_txn->mt_dbs[0] = mx->mx_dbs[0];
- mc->mc_txn->mt_dbs[1] = mx->mx_dbs[1];
- if (mc->mc_dbi > 1) {
- mc->mc_txn->mt_dbs[mc->mc_dbi] = mx->mx_dbs[2];
- mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty = mx->mx_dbxs[2].md_dirty;
+ mc->mc_orig = NULL;
+ mc->mc_dbi = dbi;
+ mc->mc_txn = txn;
+ mc->mc_db = &txn->mt_dbs[dbi];
+ mc->mc_dbx = &txn->mt_dbxs[dbi];
+ mc->mc_dbflag = &txn->mt_dbflags[dbi];
+ mc->mc_snum = 0;
+ mc->mc_top = 0;
+ mc->mc_flags = 0;
+ if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
+ assert(mx != NULL);
+ mc->mc_xcursor = mx;
+ mdb_xcursor_init0(mc);
+ } else {
+ mc->mc_xcursor = NULL;
}
}
mdb_cursor_open(MDB_txn *txn, MDB_dbi dbi, MDB_cursor **ret)
{
MDB_cursor *mc;
+ MDB_xcursor *mx = NULL;
size_t size = sizeof(MDB_cursor);
- if (txn == NULL || ret == NULL || !dbi || dbi >= txn->mt_numdbs)
+ if (txn == NULL || ret == NULL || dbi >= txn->mt_numdbs)
+ return EINVAL;
+
+ /* Allow read access to the freelist */
+ if (!dbi && !F_ISSET(txn->mt_flags, MDB_TXN_RDONLY))
return EINVAL;
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT)
size += sizeof(MDB_xcursor);
- if ((mc = calloc(1, size)) != NULL) {
- mc->mc_dbi = dbi;
- mc->mc_txn = txn;
+ if ((mc = malloc(size)) != NULL) {
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
- MDB_xcursor *mx = (MDB_xcursor *)(mc + 1);
- mc->mc_xcursor = mx;
- mdb_xcursor_init0(mc);
+ mx = (MDB_xcursor *)(mc + 1);
+ }
+ mdb_cursor_init(mc, txn, dbi, mx);
+ if (txn->mt_cursors) {
+ mc->mc_next = txn->mt_cursors[dbi];
+ txn->mt_cursors[dbi] = mc;
}
+ mc->mc_flags |= C_ALLOCD;
} else {
return ENOMEM;
}
/* Return the count of duplicate data items for the current key */
int
-mdb_cursor_count(MDB_cursor *mc, unsigned long *countp)
+mdb_cursor_count(MDB_cursor *mc, size_t *countp)
{
MDB_node *leaf;
if (mc == NULL || countp == NULL)
return EINVAL;
- if (!(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPSORT))
+ if (!(mc->mc_db->md_flags & MDB_DUPSORT))
return EINVAL;
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
if (!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED))
return EINVAL;
- *countp = mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi].md_entries;
+ *countp = mc->mc_xcursor->mx_db.md_entries;
}
return MDB_SUCCESS;
}
mdb_cursor_close(MDB_cursor *mc)
{
if (mc != NULL) {
- free(mc);
+ /* remove from txn, if tracked */
+ if (mc->mc_txn->mt_cursors) {
+ MDB_cursor **prev = &mc->mc_txn->mt_cursors[mc->mc_dbi];
+ while (*prev && *prev != mc) prev = &(*prev)->mc_next;
+ if (*prev == mc)
+ *prev = mc->mc_next;
+ }
+ if (mc->mc_flags & C_ALLOCD)
+ free(mc);
}
}
+MDB_txn *
+mdb_cursor_txn(MDB_cursor *mc)
+{
+ if (!mc) return NULL;
+ return mc->mc_txn;
+}
+
+MDB_dbi
+mdb_cursor_dbi(MDB_cursor *mc)
+{
+ if (!mc) return 0;
+ return mc->mc_dbi;
+}
+
+/** Replace the key for a node with a new key.
+ * @param[in] mp The page containing the node to operate on.
+ * @param[in] indx The index of the node to operate on.
+ * @param[in] key The new key to use.
+ * @return 0 on success, non-zero on failure.
+ */
static int
mdb_update_key(MDB_page *mp, indx_t indx, MDB_val *key)
{
- indx_t ptr, i, numkeys;
- int delta;
- size_t len;
MDB_node *node;
char *base;
+ size_t len;
+ int delta, delta0;
+ indx_t ptr, i, numkeys;
DKBUF;
node = NODEPTR(mp, indx);
ptr = mp->mp_ptrs[indx];
- DPRINTF("update key %u (ofs %u) [%.*s] to [%s] on page %lu",
- indx, ptr,
- (int)node->mn_ksize, (char *)NODEKEY(node),
- DKEY(key),
- mp->mp_pgno);
+#if MDB_DEBUG
+ {
+ MDB_val k2;
+ char kbuf2[(MAXKEYSIZE*2+1)];
+ k2.mv_data = NODEKEY(node);
+ k2.mv_size = node->mn_ksize;
+ DPRINTF("update key %u (ofs %u) [%s] to [%s] on page %zu",
+ indx, ptr,
+ mdb_dkey(&k2, kbuf2),
+ DKEY(key),
+ mp->mp_pgno);
+ }
+#endif
+
+ delta0 = delta = key->mv_size - node->mn_ksize;
- delta = key->mv_size - node->mn_ksize;
+ /* Must be 2-byte aligned. If new key is
+ * shorter by 1, the shift will be skipped.
+ */
+ delta += (delta & 1);
if (delta) {
if (delta > 0 && SIZELEFT(mp) < delta) {
DPRINTF("OUCH! Not enough room, delta = %d", delta);
mp->mp_upper -= delta;
node = NODEPTR(mp, indx);
- node->mn_ksize = key->mv_size;
}
- memcpy(NODEKEY(node), key->mv_data, key->mv_size);
+ /* But even if no shift was needed, update ksize */
+ if (delta0)
+ node->mn_ksize = key->mv_size;
+
+ if (key->mv_size)
+ memcpy(NODEKEY(node), key->mv_data, key->mv_size);
return MDB_SUCCESS;
}
-/* Move a node from csrc to cdst.
+/** Move a node from csrc to cdst.
*/
static int
-mdb_move_node(MDB_cursor *csrc, MDB_cursor *cdst)
+mdb_node_move(MDB_cursor *csrc, MDB_cursor *cdst)
{
int rc;
MDB_node *srcnode;
MDB_val key, data;
+ pgno_t srcpg;
+ unsigned short flags;
+
DKBUF;
/* Mark src and dst as dirty. */
- if ((rc = mdb_touch(csrc)) ||
- (rc = mdb_touch(cdst)))
- return rc;;
+ if ((rc = mdb_page_touch(csrc)) ||
+ (rc = mdb_page_touch(cdst)))
+ return rc;
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], 0); /* fake */
- key.mv_size = csrc->mc_txn->mt_dbs[csrc->mc_dbi].md_pad;
+ key.mv_size = csrc->mc_db->md_pad;
key.mv_data = LEAF2KEY(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top], key.mv_size);
data.mv_size = 0;
data.mv_data = NULL;
+ srcpg = 0;
+ flags = 0;
} else {
+ srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top]);
+ assert(!((long)srcnode&1));
+ srcpg = NODEPGNO(srcnode);
+ flags = srcnode->mn_flags;
if (csrc->mc_ki[csrc->mc_top] == 0 && IS_BRANCH(csrc->mc_pg[csrc->mc_top])) {
unsigned int snum = csrc->mc_snum;
+ MDB_node *s2;
/* must find the lowest key below src */
- mdb_search_page_root(csrc, NULL, 0);
- srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], 0);
+ mdb_page_search_root(csrc, NULL, 0);
+ s2 = NODEPTR(csrc->mc_pg[csrc->mc_top], 0);
+ key.mv_size = NODEKSZ(s2);
+ key.mv_data = NODEKEY(s2);
csrc->mc_snum = snum--;
csrc->mc_top = snum;
} else {
- srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top]);
+ key.mv_size = NODEKSZ(srcnode);
+ key.mv_data = NODEKEY(srcnode);
}
- key.mv_size = NODEKSZ(srcnode);
- key.mv_data = NODEKEY(srcnode);
data.mv_size = NODEDSZ(srcnode);
data.mv_data = NODEDATA(srcnode);
}
- DPRINTF("moving %s node %u [%s] on page %lu to node %u on page %lu",
+ if (IS_BRANCH(cdst->mc_pg[cdst->mc_top]) && cdst->mc_ki[cdst->mc_top] == 0) {
+ unsigned int snum = cdst->mc_snum;
+ MDB_node *s2;
+ MDB_val bkey;
+ /* must find the lowest key below dst */
+ mdb_page_search_root(cdst, NULL, 0);
+ s2 = NODEPTR(cdst->mc_pg[cdst->mc_top], 0);
+ bkey.mv_size = NODEKSZ(s2);
+ bkey.mv_data = NODEKEY(s2);
+ cdst->mc_snum = snum--;
+ cdst->mc_top = snum;
+ rc = mdb_update_key(cdst->mc_pg[cdst->mc_top], 0, &bkey);
+ }
+
+ DPRINTF("moving %s node %u [%s] on page %zu to node %u on page %zu",
IS_LEAF(csrc->mc_pg[csrc->mc_top]) ? "leaf" : "branch",
csrc->mc_ki[csrc->mc_top],
DKEY(&key),
/* Add the node to the destination page.
*/
- rc = mdb_add_node(cdst, cdst->mc_ki[cdst->mc_top], &key, &data, NODEPGNO(srcnode),
- srcnode->mn_flags);
+ rc = mdb_node_add(cdst, cdst->mc_ki[cdst->mc_top], &key, &data, srcpg, flags);
if (rc != MDB_SUCCESS)
return rc;
/* Delete the node from the source page.
*/
- mdb_del_node(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top], key.mv_size);
+ mdb_node_del(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top], key.mv_size);
+
+ {
+ /* Adjust other cursors pointing to mp */
+ MDB_cursor *m2, *m3;
+ MDB_dbi dbi = csrc->mc_dbi;
+ MDB_page *mp = csrc->mc_pg[csrc->mc_top];
+
+ if (csrc->mc_flags & C_SUB)
+ dbi--;
+
+ for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
+ if (m2 == csrc) continue;
+ if (csrc->mc_flags & C_SUB)
+ m3 = &m2->mc_xcursor->mx_cursor;
+ else
+ m3 = m2;
+ if (m3->mc_pg[csrc->mc_top] == mp && m3->mc_ki[csrc->mc_top] ==
+ csrc->mc_ki[csrc->mc_top]) {
+ m3->mc_pg[csrc->mc_top] = cdst->mc_pg[cdst->mc_top];
+ m3->mc_ki[csrc->mc_top] = cdst->mc_ki[cdst->mc_top];
+ }
+ }
+ }
/* Update the parent separators.
*/
if (csrc->mc_ki[csrc->mc_top] == 0) {
if (csrc->mc_ki[csrc->mc_top-1] != 0) {
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
- key.mv_data = LEAF2KEY(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top], key.mv_size);
+ key.mv_data = LEAF2KEY(csrc->mc_pg[csrc->mc_top], 0, key.mv_size);
} else {
- srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top]);
+ srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], 0);
key.mv_size = NODEKSZ(srcnode);
key.mv_data = NODEKEY(srcnode);
}
- DPRINTF("update separator for source page %lu to [%s]",
+ DPRINTF("update separator for source page %zu to [%s]",
csrc->mc_pg[csrc->mc_top]->mp_pgno, DKEY(&key));
if ((rc = mdb_update_key(csrc->mc_pg[csrc->mc_top-1], csrc->mc_ki[csrc->mc_top-1],
&key)) != MDB_SUCCESS)
if (IS_BRANCH(csrc->mc_pg[csrc->mc_top])) {
MDB_val nullkey;
nullkey.mv_size = 0;
- assert(mdb_update_key(csrc->mc_pg[csrc->mc_top], 0, &nullkey) == MDB_SUCCESS);
+ rc = mdb_update_key(csrc->mc_pg[csrc->mc_top], 0, &nullkey);
+ assert(rc == MDB_SUCCESS);
}
}
key.mv_size = NODEKSZ(srcnode);
key.mv_data = NODEKEY(srcnode);
}
- DPRINTF("update separator for destination page %lu to [%s]",
+ DPRINTF("update separator for destination page %zu to [%s]",
cdst->mc_pg[cdst->mc_top]->mp_pgno, DKEY(&key));
if ((rc = mdb_update_key(cdst->mc_pg[cdst->mc_top-1], cdst->mc_ki[cdst->mc_top-1],
&key)) != MDB_SUCCESS)
if (IS_BRANCH(cdst->mc_pg[cdst->mc_top])) {
MDB_val nullkey;
nullkey.mv_size = 0;
- assert(mdb_update_key(cdst->mc_pg[cdst->mc_top], 0, &nullkey) == MDB_SUCCESS);
+ rc = mdb_update_key(cdst->mc_pg[cdst->mc_top], 0, &nullkey);
+ assert(rc == MDB_SUCCESS);
}
}
return MDB_SUCCESS;
}
+/** Merge one page into another.
+ * The nodes from the page pointed to by \b csrc will
+ * be copied to the page pointed to by \b cdst and then
+ * 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.
+ */
static int
-mdb_merge(MDB_cursor *csrc, MDB_cursor *cdst)
+mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst)
{
int rc;
indx_t i, j;
MDB_node *srcnode;
MDB_val key, data;
+ unsigned nkeys;
- DPRINTF("merging page %lu into %lu", csrc->mc_pg[csrc->mc_top]->mp_pgno, cdst->mc_pg[cdst->mc_top]->mp_pgno);
+ DPRINTF("merging page %zu into %zu", csrc->mc_pg[csrc->mc_top]->mp_pgno,
+ cdst->mc_pg[cdst->mc_top]->mp_pgno);
assert(csrc->mc_snum > 1); /* can't merge root page */
assert(cdst->mc_snum > 1);
/* Mark dst as dirty. */
- if ((rc = mdb_touch(cdst)))
+ if ((rc = mdb_page_touch(cdst)))
return rc;
/* Move all nodes from src to dst.
*/
- j = NUMKEYS(cdst->mc_pg[cdst->mc_top]);
+ j = nkeys = NUMKEYS(cdst->mc_pg[cdst->mc_top]);
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
- key.mv_size = csrc->mc_txn->mt_dbs[csrc->mc_dbi].md_pad;
+ key.mv_size = csrc->mc_db->md_pad;
key.mv_data = METADATA(csrc->mc_pg[csrc->mc_top]);
for (i = 0; i < NUMKEYS(csrc->mc_pg[csrc->mc_top]); i++, j++) {
- rc = mdb_add_node(cdst, j, &key, NULL, 0, 0);
+ rc = mdb_node_add(cdst, j, &key, NULL, 0, 0);
if (rc != MDB_SUCCESS)
return rc;
key.mv_data = (char *)key.mv_data + key.mv_size;
} else {
for (i = 0; i < NUMKEYS(csrc->mc_pg[csrc->mc_top]); i++, j++) {
srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], i);
+ if (i == 0 && IS_BRANCH(csrc->mc_pg[csrc->mc_top])) {
+ unsigned int snum = csrc->mc_snum;
+ MDB_node *s2;
+ /* must find the lowest key below src */
+ mdb_page_search_root(csrc, NULL, 0);
+ s2 = NODEPTR(csrc->mc_pg[csrc->mc_top], 0);
+ key.mv_size = NODEKSZ(s2);
+ key.mv_data = NODEKEY(s2);
+ csrc->mc_snum = snum--;
+ csrc->mc_top = snum;
+ } else {
+ key.mv_size = srcnode->mn_ksize;
+ key.mv_data = NODEKEY(srcnode);
+ }
- key.mv_size = srcnode->mn_ksize;
- key.mv_data = NODEKEY(srcnode);
data.mv_size = NODEDSZ(srcnode);
data.mv_data = NODEDATA(srcnode);
- rc = mdb_add_node(cdst, j, &key, &data, NODEPGNO(srcnode), srcnode->mn_flags);
+ rc = mdb_node_add(cdst, j, &key, &data, NODEPGNO(srcnode), srcnode->mn_flags);
if (rc != MDB_SUCCESS)
return rc;
}
}
- DPRINTF("dst page %lu now has %u keys (%.1f%% filled)",
+ DPRINTF("dst page %zu now has %u keys (%.1f%% filled)",
cdst->mc_pg[cdst->mc_top]->mp_pgno, NUMKEYS(cdst->mc_pg[cdst->mc_top]), (float)PAGEFILL(cdst->mc_txn->mt_env, cdst->mc_pg[cdst->mc_top]) / 10);
/* Unlink the src page from parent and add to free list.
*/
- mdb_del_node(csrc->mc_pg[csrc->mc_top-1], csrc->mc_ki[csrc->mc_top-1], 0);
+ 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) {
key.mv_size = 0;
if ((rc = mdb_update_key(csrc->mc_pg[csrc->mc_top-1], 0, &key)) != MDB_SUCCESS)
return rc;
}
- mdb_midl_append(csrc->mc_txn->mt_free_pgs, csrc->mc_pg[csrc->mc_top]->mp_pgno);
+ mdb_midl_append(&csrc->mc_txn->mt_free_pgs, csrc->mc_pg[csrc->mc_top]->mp_pgno);
if (IS_LEAF(csrc->mc_pg[csrc->mc_top]))
- csrc->mc_txn->mt_dbs[csrc->mc_dbi].md_leaf_pages--;
+ csrc->mc_db->md_leaf_pages--;
else
- csrc->mc_txn->mt_dbs[csrc->mc_dbi].md_branch_pages--;
- cursor_pop_page(csrc);
+ csrc->mc_db->md_branch_pages--;
+ {
+ /* Adjust other cursors pointing to mp */
+ MDB_cursor *m2, *m3;
+ MDB_dbi dbi = csrc->mc_dbi;
+ MDB_page *mp = cdst->mc_pg[cdst->mc_top];
+
+ if (csrc->mc_flags & C_SUB)
+ dbi--;
+
+ for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
+ if (csrc->mc_flags & C_SUB)
+ m3 = &m2->mc_xcursor->mx_cursor;
+ else
+ m3 = m2;
+ if (m3 == csrc) continue;
+ if (m3->mc_snum < csrc->mc_snum) continue;
+ if (m3->mc_pg[csrc->mc_top] == csrc->mc_pg[csrc->mc_top]) {
+ m3->mc_pg[csrc->mc_top] = mp;
+ m3->mc_ki[csrc->mc_top] += nkeys;
+ }
+ }
+ }
+ mdb_cursor_pop(csrc);
return mdb_rebalance(csrc);
}
+/** Copy the contents of a cursor.
+ * @param[in] csrc The cursor to copy from.
+ * @param[out] cdst The cursor to copy to.
+ */
static void
mdb_cursor_copy(const MDB_cursor *csrc, MDB_cursor *cdst)
{
cdst->mc_txn = csrc->mc_txn;
cdst->mc_dbi = csrc->mc_dbi;
+ cdst->mc_db = csrc->mc_db;
+ cdst->mc_dbx = csrc->mc_dbx;
cdst->mc_snum = csrc->mc_snum;
cdst->mc_top = csrc->mc_top;
cdst->mc_flags = csrc->mc_flags;
}
}
+/** Rebalance the tree after a delete operation.
+ * @param[in] mc Cursor pointing to the page where rebalancing
+ * should begin.
+ * @return 0 on success, non-zero on failure.
+ */
static int
mdb_rebalance(MDB_cursor *mc)
{
MDB_node *node;
- MDB_page *root;
int rc;
unsigned int ptop;
MDB_cursor mn;
- DPRINTF("rebalancing %s page %lu (has %u keys, %.1f%% full)",
+#if MDB_DEBUG
+ {
+ pgno_t pgno;
+ COPY_PGNO(pgno, mc->mc_pg[mc->mc_top]->mp_pgno);
+ DPRINTF("rebalancing %s page %zu (has %u keys, %.1f%% full)",
IS_LEAF(mc->mc_pg[mc->mc_top]) ? "leaf" : "branch",
- mc->mc_pg[mc->mc_top]->mp_pgno, NUMKEYS(mc->mc_pg[mc->mc_top]), (float)PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) / 10);
+ pgno, NUMKEYS(mc->mc_pg[mc->mc_top]), (float)PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) / 10);
+ }
+#endif
if (PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) >= FILL_THRESHOLD) {
- DPRINTF("no need to rebalance page %lu, above fill threshold",
- mc->mc_pg[mc->mc_top]->mp_pgno);
+#if MDB_DEBUG
+ pgno_t pgno;
+ COPY_PGNO(pgno, mc->mc_pg[mc->mc_top]->mp_pgno);
+ DPRINTF("no need to rebalance page %zu, above fill threshold",
+ pgno);
+#endif
return MDB_SUCCESS;
}
if (mc->mc_snum < 2) {
- if (NUMKEYS(mc->mc_pg[mc->mc_top]) == 0) {
+ MDB_page *mp = mc->mc_pg[0];
+ if (NUMKEYS(mp) == 0) {
DPUTS("tree is completely empty");
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = P_INVALID;
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_depth = 0;
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_leaf_pages = 0;
- mdb_midl_append(mc->mc_txn->mt_free_pgs, mc->mc_pg[mc->mc_top]->mp_pgno);
- } else if (IS_BRANCH(mc->mc_pg[mc->mc_top]) && NUMKEYS(mc->mc_pg[mc->mc_top]) == 1) {
+ mc->mc_db->md_root = P_INVALID;
+ mc->mc_db->md_depth = 0;
+ mc->mc_db->md_leaf_pages = 0;
+ mdb_midl_append(&mc->mc_txn->mt_free_pgs, mp->mp_pgno);
+ mc->mc_snum = 0;
+ mc->mc_top = 0;
+ {
+ /* Adjust other cursors pointing to mp */
+ MDB_cursor *m2, *m3;
+ MDB_dbi dbi = mc->mc_dbi;
+
+ if (mc->mc_flags & C_SUB)
+ dbi--;
+
+ for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
+ if (m2 == mc) continue;
+ if (mc->mc_flags & C_SUB)
+ m3 = &m2->mc_xcursor->mx_cursor;
+ else
+ m3 = m2;
+ if (m3->mc_snum < mc->mc_snum) continue;
+ if (m3->mc_pg[0] == mp) {
+ m3->mc_snum = 0;
+ m3->mc_top = 0;
+ }
+ }
+ }
+ } else if (IS_BRANCH(mp) && NUMKEYS(mp) == 1) {
DPUTS("collapsing root page!");
- mdb_midl_append(mc->mc_txn->mt_free_pgs, mc->mc_pg[mc->mc_top]->mp_pgno);
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = NODEPGNO(NODEPTR(mc->mc_pg[mc->mc_top], 0));
- if ((rc = mdb_get_page(mc->mc_txn, mc->mc_txn->mt_dbs[mc->mc_dbi].md_root, &root)))
+ mdb_midl_append(&mc->mc_txn->mt_free_pgs, mp->mp_pgno);
+ mc->mc_db->md_root = NODEPGNO(NODEPTR(mp, 0));
+ if ((rc = mdb_page_get(mc->mc_txn, mc->mc_db->md_root,
+ &mc->mc_pg[0])))
return rc;
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_depth--;
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_branch_pages--;
+ mc->mc_db->md_depth--;
+ mc->mc_db->md_branch_pages--;
+ {
+ /* Adjust other cursors pointing to mp */
+ MDB_cursor *m2, *m3;
+ MDB_dbi dbi = mc->mc_dbi;
+
+ if (mc->mc_flags & C_SUB)
+ dbi--;
+
+ for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
+ if (m2 == mc) continue;
+ if (mc->mc_flags & C_SUB)
+ m3 = &m2->mc_xcursor->mx_cursor;
+ else
+ m3 = m2;
+ if (m3->mc_snum < mc->mc_snum) continue;
+ if (m3->mc_pg[0] == mp) {
+ m3->mc_pg[0] = mc->mc_pg[0];
+ }
+ }
+ }
} else
DPUTS("root page doesn't need rebalancing");
return MDB_SUCCESS;
DPUTS("reading right neighbor");
mn.mc_ki[ptop]++;
node = NODEPTR(mc->mc_pg[ptop], mn.mc_ki[ptop]);
- if ((rc = mdb_get_page(mc->mc_txn, NODEPGNO(node), &mn.mc_pg[mn.mc_top])))
+ if ((rc = mdb_page_get(mc->mc_txn, NODEPGNO(node), &mn.mc_pg[mn.mc_top])))
return rc;
mn.mc_ki[mn.mc_top] = 0;
mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top]);
DPUTS("reading left neighbor");
mn.mc_ki[ptop]--;
node = NODEPTR(mc->mc_pg[ptop], mn.mc_ki[ptop]);
- if ((rc = mdb_get_page(mc->mc_txn, NODEPGNO(node), &mn.mc_pg[mn.mc_top])))
+ if ((rc = mdb_page_get(mc->mc_txn, NODEPGNO(node), &mn.mc_pg[mn.mc_top])))
return rc;
mn.mc_ki[mn.mc_top] = NUMKEYS(mn.mc_pg[mn.mc_top]) - 1;
mc->mc_ki[mc->mc_top] = 0;
}
- DPRINTF("found neighbor page %lu (%u keys, %.1f%% full)",
+ DPRINTF("found neighbor page %zu (%u keys, %.1f%% full)",
mn.mc_pg[mn.mc_top]->mp_pgno, NUMKEYS(mn.mc_pg[mn.mc_top]), (float)PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) / 10);
/* If the neighbor page is above threshold and has at least two
* Otherwise we should try to merge them.
*/
if (PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) >= FILL_THRESHOLD && NUMKEYS(mn.mc_pg[mn.mc_top]) >= 2)
- return mdb_move_node(&mn, mc);
+ return mdb_node_move(&mn, mc);
else { /* FIXME: if (has_enough_room()) */
+ mc->mc_flags &= ~C_INITIALIZED;
if (mc->mc_ki[ptop] == 0)
- return mdb_merge(&mn, mc);
+ return mdb_page_merge(&mn, mc);
else
- return mdb_merge(mc, &mn);
+ return mdb_page_merge(mc, &mn);
}
}
+/** Complete a delete operation started by #mdb_cursor_del(). */
static int
-mdb_del0(MDB_cursor *mc, MDB_node *leaf)
+mdb_cursor_del0(MDB_cursor *mc, MDB_node *leaf)
{
int rc;
memcpy(&pg, NODEDATA(leaf), sizeof(pg));
ovpages = OVPAGES(NODEDSZ(leaf), mc->mc_txn->mt_env->me_psize);
+ mc->mc_db->md_overflow_pages -= ovpages;
for (i=0; i<ovpages; i++) {
- DPRINTF("freed ov page %lu", pg);
- mdb_midl_append(mc->mc_txn->mt_free_pgs, pg);
+ DPRINTF("freed ov page %zu", pg);
+ mdb_midl_append(&mc->mc_txn->mt_free_pgs, pg);
pg++;
}
}
- mdb_del_node(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad);
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries--;
+ mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], mc->mc_db->md_pad);
+ mc->mc_db->md_entries--;
rc = mdb_rebalance(mc);
if (rc != MDB_SUCCESS)
mc->mc_txn->mt_flags |= MDB_TXN_ERROR;
return EINVAL;
}
- mc.mc_txn = txn;
- mc.mc_dbi = dbi;
- mc.mc_flags = 0;
- if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
- mc.mc_xcursor = &mx;
- mdb_xcursor_init0(&mc);
- } else {
- mc.mc_xcursor = NULL;
- }
+ mdb_cursor_init(&mc, txn, dbi, &mx);
exact = 0;
if (data) {
return rc;
}
-/* Split page <mc->top>, and insert <key,(data|newpgno)> in either left or
- * right sibling, at index <mc->ki> (as if unsplit). Updates mc->top and
- * mc->ki with the actual values after split, ie if mc->top and mc->ki
- * refer to a node in the new right sibling page.
+/** Split a page and insert a new node.
+ * @param[in,out] mc Cursor pointing to the page and desired insertion index.
+ * The cursor will be updated to point to the actual page and index where
+ * the node got inserted after the split.
+ * @param[in] newkey The key for the newly inserted node.
+ * @param[in] newdata The data for the newly inserted node.
+ * @param[in] newpgno The page number, if the new node is a branch node.
+ * @return 0 on success, non-zero on failure.
*/
static int
-mdb_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno)
+mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno,
+ unsigned int nflags)
{
- uint8_t flags;
- int rc = MDB_SUCCESS, ins_new = 0;
+ unsigned int flags;
+ int rc = MDB_SUCCESS, ins_new = 0, new_root = 0, newpos = 1;
indx_t newindx;
pgno_t pgno = 0;
unsigned int i, j, split_indx, nkeys, pmax;
MDB_node *node;
- MDB_val sepkey, rkey, rdata;
+ MDB_val sepkey, rkey, xdata, *rdata = &xdata;
MDB_page *copy;
MDB_page *mp, *rp, *pp;
unsigned int ptop;
mp = mc->mc_pg[mc->mc_top];
newindx = mc->mc_ki[mc->mc_top];
- DPRINTF("-----> splitting %s page %lu and adding [%s] at index %i",
+ DPRINTF("-----> splitting %s page %zu and adding [%s] at index %i",
IS_LEAF(mp) ? "leaf" : "branch", mp->mp_pgno,
DKEY(newkey), mc->mc_ki[mc->mc_top]);
+ /* Create a right sibling. */
+ if ((rp = mdb_page_new(mc, mp->mp_flags, 1)) == NULL)
+ return ENOMEM;
+ DPRINTF("new right sibling: page %zu", rp->mp_pgno);
+
if (mc->mc_snum < 2) {
- if ((pp = mdb_new_page(mc, P_BRANCH, 1)) == NULL)
+ if ((pp = mdb_page_new(mc, P_BRANCH, 1)) == NULL)
return ENOMEM;
/* shift current top to make room for new parent */
mc->mc_pg[1] = mc->mc_pg[0];
mc->mc_ki[1] = mc->mc_ki[0];
mc->mc_pg[0] = pp;
mc->mc_ki[0] = 0;
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = pp->mp_pgno;
- DPRINTF("root split! new root = %lu", pp->mp_pgno);
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_depth++;
+ mc->mc_db->md_root = pp->mp_pgno;
+ DPRINTF("root split! new root = %zu", pp->mp_pgno);
+ mc->mc_db->md_depth++;
+ new_root = 1;
/* Add left (implicit) pointer. */
- if ((rc = mdb_add_node(mc, 0, NULL, NULL, mp->mp_pgno, 0)) != MDB_SUCCESS) {
+ if ((rc = mdb_node_add(mc, 0, NULL, NULL, mp->mp_pgno, 0)) != MDB_SUCCESS) {
/* undo the pre-push */
mc->mc_pg[0] = mc->mc_pg[1];
mc->mc_ki[0] = mc->mc_ki[1];
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = mp->mp_pgno;
- mc->mc_txn->mt_dbs[mc->mc_dbi].md_depth--;
+ mc->mc_db->md_root = mp->mp_pgno;
+ mc->mc_db->md_depth--;
return rc;
}
mc->mc_snum = 2;
ptop = 0;
} else {
ptop = mc->mc_top-1;
- DPRINTF("parent branch page is %lu", mc->mc_pg[ptop]->mp_pgno);
+ DPRINTF("parent branch page is %zu", mc->mc_pg[ptop]->mp_pgno);
}
- /* Create a right sibling. */
- if ((rp = mdb_new_page(mc, mp->mp_flags, 1)) == NULL)
- return ENOMEM;
mdb_cursor_copy(mc, &mn);
mn.mc_pg[mn.mc_top] = rp;
mn.mc_ki[ptop] = mc->mc_ki[ptop]+1;
- DPRINTF("new right sibling: page %lu", rp->mp_pgno);
+
+ if (nflags & MDB_APPEND) {
+ mn.mc_ki[mn.mc_top] = 0;
+ sepkey = *newkey;
+ nkeys = 0;
+ split_indx = 0;
+ goto newsep;
+ }
nkeys = NUMKEYS(mp);
- split_indx = nkeys / 2 + 1;
+ split_indx = (nkeys + 1) / 2;
if (IS_LEAF2(rp)) {
char *split, *ins;
/* Move half of the keys to the right sibling */
copy = NULL;
x = mc->mc_ki[mc->mc_top] - split_indx;
- ksize = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
+ ksize = mc->mc_db->md_pad;
split = LEAF2KEY(mp, split_indx, ksize);
rsize = (nkeys - split_indx) * ksize;
lsize = (nkeys - split_indx) * sizeof(indx_t);
}
/* For leaf pages, check the split point based on what
- * fits where, since otherwise add_node can fail.
+ * fits where, since otherwise mdb_node_add can fail.
+ *
+ * This check is only needed when the data items are
+ * relatively large, such that being off by one will
+ * make the difference between success or failure.
+ * When the size of the data items is much smaller than
+ * one-half of a page, this check is irrelevant.
*/
- if (IS_LEAF(mp)) {
+ if (IS_LEAF(mp) && nkeys < 16) {
unsigned int psize, nsize;
/* Maximum free space in an empty page */
pmax = mc->mc_txn->mt_env->me_psize - PAGEHDRSZ;
nsize = mdb_leaf_size(mc->mc_txn->mt_env, newkey, newdata);
- if (newindx < split_indx) {
+ if (newindx <= split_indx) {
psize = nsize;
+ newpos = 0;
for (i=0; i<split_indx; i++) {
node = NODEPTR(mp, i);
psize += NODESIZE + NODEKSZ(node) + sizeof(indx_t);
psize += NODEDSZ(node);
psize += psize & 1;
if (psize > pmax) {
- split_indx = i;
+ if (i == split_indx - 1 && newindx == split_indx)
+ newpos = 1;
+ else
+ split_indx = i;
break;
}
}
}
/* First find the separating key between the split pages.
+ * The case where newindx == split_indx is ambiguous; the
+ * new item could go to the new page or stay on the original
+ * page. If newpos == 1 it goes to the new page.
*/
- if (newindx == split_indx) {
+ if (newindx == split_indx && newpos) {
sepkey.mv_size = newkey->mv_size;
sepkey.mv_data = newkey->mv_data;
} else {
if (SIZELEFT(mn.mc_pg[ptop]) < mdb_branch_size(mc->mc_txn->mt_env, &sepkey)) {
mn.mc_snum--;
mn.mc_top--;
- rc = mdb_split(&mn, &sepkey, NULL, rp->mp_pgno);
+ rc = mdb_page_split(&mn, &sepkey, NULL, rp->mp_pgno, 0);
/* Right page might now have changed parent.
* Check if left page also changed parent.
}
} else {
mn.mc_top--;
- rc = mdb_add_node(&mn, mn.mc_ki[ptop], &sepkey, NULL, rp->mp_pgno, 0);
+ rc = mdb_node_add(&mn, mn.mc_ki[ptop], &sepkey, NULL, rp->mp_pgno, 0);
mn.mc_top++;
}
- if (IS_LEAF2(rp)) {
- return rc;
- }
if (rc != MDB_SUCCESS) {
return rc;
}
+ if (nflags & MDB_APPEND) {
+ mc->mc_pg[mc->mc_top] = rp;
+ mc->mc_ki[mc->mc_top] = 0;
+ rc = mdb_node_add(mc, 0, newkey, newdata, newpgno, nflags);
+ if (rc)
+ return rc;
+ goto done;
+ }
+ if (IS_LEAF2(rp)) {
+ goto done;
+ }
/* Move half of the keys to the right sibling. */
/* grab a page to hold a temporary copy */
- if (mc->mc_txn->mt_env->me_dpages) {
- copy = mc->mc_txn->mt_env->me_dpages;
- mc->mc_txn->mt_env->me_dpages = copy->mp_next;
- } else {
- if ((copy = malloc(mc->mc_txn->mt_env->me_psize)) == NULL)
- return ENOMEM;
- }
+ copy = mdb_page_malloc(mc);
+ if (copy == NULL)
+ return ENOMEM;
copy->mp_pgno = mp->mp_pgno;
copy->mp_flags = mp->mp_flags;
if (i == split_indx) {
/* Insert in right sibling. */
/* Reset insert index for right sibling. */
- j = (i == newindx && ins_new);
- mc->mc_pg[mc->mc_top] = rp;
+ if (i != newindx || (newpos ^ ins_new)) {
+ j = 0;
+ mc->mc_pg[mc->mc_top] = rp;
+ }
}
if (i == newindx && !ins_new) {
rkey.mv_data = newkey->mv_data;
rkey.mv_size = newkey->mv_size;
if (IS_LEAF(mp)) {
- rdata.mv_data = newdata->mv_data;
- rdata.mv_size = newdata->mv_size;
+ rdata = newdata;
} else
pgno = newpgno;
- flags = 0;
+ flags = nflags;
ins_new = 1;
- /* Update page and index for the new key. */
+ /* Update index for the new key. */
mc->mc_ki[mc->mc_top] = j;
} else if (i == nkeys) {
break;
rkey.mv_data = NODEKEY(node);
rkey.mv_size = node->mn_ksize;
if (IS_LEAF(mp)) {
- rdata.mv_data = NODEDATA(node);
- rdata.mv_size = NODEDSZ(node);
+ xdata.mv_data = NODEDATA(node);
+ xdata.mv_size = NODEDSZ(node);
+ rdata = &xdata;
} else
pgno = NODEPGNO(node);
flags = node->mn_flags;
rkey.mv_size = 0;
}
- rc = mdb_add_node(mc, j, &rkey, &rdata, pgno, flags);
+ rc = mdb_node_add(mc, j, &rkey, rdata, pgno, flags);
}
- /* reset back to original page */
- if (newindx < split_indx)
- mc->mc_pg[mc->mc_top] = mp;
-
nkeys = NUMKEYS(copy);
for (i=0; i<nkeys; i++)
mp->mp_ptrs[i] = copy->mp_ptrs[i];
memcpy(NODEPTR(mp, nkeys-1), NODEPTR(copy, nkeys-1),
mc->mc_txn->mt_env->me_psize - copy->mp_upper);
+ /* reset back to original page */
+ if (newindx < split_indx || (!newpos && newindx == split_indx)) {
+ mc->mc_pg[mc->mc_top] = mp;
+ if (nflags & MDB_RESERVE) {
+ node = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
+ if (!(node->mn_flags & F_BIGDATA))
+ newdata->mv_data = NODEDATA(node);
+ }
+ }
+
/* return tmp page to freelist */
copy->mp_next = mc->mc_txn->mt_env->me_dpages;
+ VGMEMP_FREE(mc->mc_txn->mt_env, copy);
mc->mc_txn->mt_env->me_dpages = copy;
+done:
+ {
+ /* Adjust other cursors pointing to mp */
+ MDB_cursor *m2, *m3;
+ MDB_dbi dbi = mc->mc_dbi;
+
+ if (mc->mc_flags & C_SUB)
+ dbi--;
+
+ for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
+ if (m2 == mc) continue;
+ if (mc->mc_flags & C_SUB)
+ m3 = &m2->mc_xcursor->mx_cursor;
+ else
+ m3 = m2;
+ if (!(m3->mc_flags & C_INITIALIZED))
+ continue;
+ if (new_root) {
+ int k;
+ /* root split */
+ for (k=m3->mc_top; k>=0; k--) {
+ m3->mc_ki[k+1] = m3->mc_ki[k];
+ m3->mc_pg[k+1] = m3->mc_pg[k];
+ }
+ m3->mc_ki[0] = mc->mc_ki[0];
+ m3->mc_pg[0] = mc->mc_pg[0];
+ m3->mc_snum++;
+ m3->mc_top++;
+ }
+ if (m3->mc_pg[mc->mc_top] == mp) {
+ if (m3->mc_ki[m3->mc_top] >= split_indx) {
+ m3->mc_pg[m3->mc_top] = rp;
+ m3->mc_ki[m3->mc_top] -= split_indx;
+ }
+ }
+ }
+ }
return rc;
}
return EINVAL;
}
- if ((flags & (MDB_NOOVERWRITE|MDB_NODUPDATA)) != flags)
+ if ((flags & (MDB_NOOVERWRITE|MDB_NODUPDATA|MDB_RESERVE|MDB_APPEND)) != flags)
return EINVAL;
- mc.mc_txn = txn;
- mc.mc_dbi = dbi;
- mc.mc_snum = 0;
- mc.mc_flags = 0;
- if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
- mc.mc_xcursor = &mx;
- mdb_xcursor_init0(&mc);
- } else {
- mc.mc_xcursor = NULL;
- }
+ mdb_cursor_init(&mc, txn, dbi, &mx);
return mdb_cursor_put(&mc, key, data, flags);
}
+/** Only a subset of the @ref mdb_env flags can be changed
+ * at runtime. Changing other flags requires closing the environment
+ * and re-opening it with the new flags.
+ */
+#define CHANGEABLE (MDB_NOSYNC)
int
mdb_env_set_flags(MDB_env *env, unsigned int flag, int onoff)
{
- /** Only a subset of the @ref mdb_env flags can be changed
- * at runtime. Changing other flags requires closing the environment
- * and re-opening it with the new flags.
- */
-#define CHANGEABLE (MDB_NOSYNC)
if ((flag & CHANGEABLE) != flag)
return EINVAL;
if (onoff)
return MDB_SUCCESS;
}
+/** Common code for #mdb_stat() and #mdb_env_stat().
+ * @param[in] env the environment to operate in.
+ * @param[in] db the #MDB_db record containing the stats to return.
+ * @param[out] arg the address of an #MDB_stat structure to receive the stats.
+ * @return 0, this function always succeeds.
+ */
static int
mdb_stat0(MDB_env *env, MDB_db *db, MDB_stat *arg)
{
return mdb_stat0(env, &env->me_metas[toggle]->mm_dbs[MAIN_DBI], arg);
}
+/** Set the default comparison functions for a database.
+ * Called immediately after a database is opened to set the defaults.
+ * The user can then override them with #mdb_set_compare() or
+ * #mdb_set_dupsort().
+ * @param[in] txn A transaction handle returned by #mdb_txn_begin()
+ * @param[in] dbi A database handle returned by #mdb_open()
+ */
static void
mdb_default_cmp(MDB_txn *txn, MDB_dbi dbi)
{
if (txn->mt_dbs[dbi].md_flags & MDB_REVERSEKEY)
- txn->mt_dbxs[dbi].md_cmp = memnrcmp;
+ txn->mt_dbxs[dbi].md_cmp = mdb_cmp_memnr;
else if (txn->mt_dbs[dbi].md_flags & MDB_INTEGERKEY)
- txn->mt_dbxs[dbi].md_cmp = cintcmp;
+ txn->mt_dbxs[dbi].md_cmp = mdb_cmp_cint;
else
- txn->mt_dbxs[dbi].md_cmp = memncmp;
+ txn->mt_dbxs[dbi].md_cmp = mdb_cmp_memn;
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
if (txn->mt_dbs[dbi].md_flags & MDB_INTEGERDUP) {
if (txn->mt_dbs[dbi].md_flags & MDB_DUPFIXED)
- txn->mt_dbxs[dbi].md_dcmp = intcmp;
+ txn->mt_dbxs[dbi].md_dcmp = mdb_cmp_int;
else
- txn->mt_dbxs[dbi].md_dcmp = cintcmp;
+ txn->mt_dbxs[dbi].md_dcmp = mdb_cmp_cint;
} else if (txn->mt_dbs[dbi].md_flags & MDB_REVERSEDUP) {
- txn->mt_dbxs[dbi].md_dcmp = memnrcmp;
+ txn->mt_dbxs[dbi].md_dcmp = mdb_cmp_memnr;
} else {
- txn->mt_dbxs[dbi].md_dcmp = memncmp;
+ txn->mt_dbxs[dbi].md_dcmp = mdb_cmp_memn;
}
} else {
txn->mt_dbxs[dbi].md_dcmp = NULL;
{
MDB_val key, data;
MDB_dbi i;
- int rc, dirty = 0;
+ MDB_cursor mc;
+ int rc, dbflag, exact;
size_t len;
if (txn->mt_dbxs[FREE_DBI].md_cmp == NULL) {
return ENFILE;
/* Find the DB info */
+ dbflag = 0;
+ exact = 0;
key.mv_size = len;
key.mv_data = (void *)name;
- rc = mdb_get(txn, MAIN_DBI, &key, &data);
-
- /* Create if requested */
- if (rc == MDB_NOTFOUND && (flags & MDB_CREATE)) {
- MDB_cursor mc;
+ mdb_cursor_init(&mc, txn, MAIN_DBI, NULL);
+ rc = mdb_cursor_set(&mc, &key, &data, MDB_SET, &exact);
+ if (rc == MDB_SUCCESS) {
+ /* make sure this is actually a DB */
+ MDB_node *node = NODEPTR(mc.mc_pg[mc.mc_top], mc.mc_ki[mc.mc_top]);
+ if (!(node->mn_flags & F_SUBDATA))
+ return EINVAL;
+ } else if (rc == MDB_NOTFOUND && (flags & MDB_CREATE)) {
+ /* Create if requested */
MDB_db dummy;
data.mv_size = sizeof(MDB_db);
data.mv_data = &dummy;
memset(&dummy, 0, sizeof(dummy));
dummy.md_root = P_INVALID;
dummy.md_flags = flags & 0xffff;
- mc.mc_txn = txn;
- mc.mc_dbi = MAIN_DBI;
- mc.mc_flags = 0;
rc = mdb_cursor_put(&mc, &key, &data, F_SUBDATA);
- dirty = 1;
+ dbflag = DB_DIRTY;
}
/* OK, got info, add to table */
txn->mt_dbxs[txn->mt_numdbs].md_name.mv_data = strdup(name);
txn->mt_dbxs[txn->mt_numdbs].md_name.mv_size = len;
txn->mt_dbxs[txn->mt_numdbs].md_rel = NULL;
- txn->mt_dbxs[txn->mt_numdbs].md_parent = MAIN_DBI;
- txn->mt_dbxs[txn->mt_numdbs].md_dirty = dirty;
+ txn->mt_dbflags[txn->mt_numdbs] = dbflag;
memcpy(&txn->mt_dbs[txn->mt_numdbs], data.mv_data, sizeof(MDB_db));
*dbi = txn->mt_numdbs;
txn->mt_env->me_dbs[0][txn->mt_numdbs] = txn->mt_dbs[txn->mt_numdbs];
return mdb_stat0(txn->mt_env, &txn->mt_dbs[dbi], arg);
}
-void mdb_close(MDB_txn *txn, MDB_dbi dbi)
+void mdb_close(MDB_env *env, MDB_dbi dbi)
{
char *ptr;
- if (dbi <= MAIN_DBI || dbi >= txn->mt_numdbs)
+ if (dbi <= MAIN_DBI || dbi >= env->me_numdbs)
return;
- ptr = txn->mt_dbxs[dbi].md_name.mv_data;
- txn->mt_dbxs[dbi].md_name.mv_data = NULL;
- txn->mt_dbxs[dbi].md_name.mv_size = 0;
+ ptr = env->me_dbxs[dbi].md_name.mv_data;
+ env->me_dbxs[dbi].md_name.mv_data = NULL;
+ env->me_dbxs[dbi].md_name.mv_size = 0;
free(ptr);
}
+/** Add all the DB's pages to the free list.
+ * @param[in] mc Cursor on the DB to free.
+ * @param[in] subs non-Zero to check for sub-DBs in this DB.
+ * @return 0 on success, non-zero on failure.
+ */
+static int
+mdb_drop0(MDB_cursor *mc, int subs)
+{
+ int rc;
+
+ rc = mdb_page_search(mc, NULL, 0);
+ if (rc == MDB_SUCCESS) {
+ MDB_node *ni;
+ MDB_cursor mx;
+ unsigned int i;
+
+ /* LEAF2 pages have no nodes, cannot have sub-DBs */
+ if (!subs || IS_LEAF2(mc->mc_pg[mc->mc_top]))
+ mdb_cursor_pop(mc);
+
+ mdb_cursor_copy(mc, &mx);
+ while (mc->mc_snum > 0) {
+ if (IS_LEAF(mc->mc_pg[mc->mc_top])) {
+ for (i=0; i<NUMKEYS(mc->mc_pg[mc->mc_top]); i++) {
+ ni = NODEPTR(mc->mc_pg[mc->mc_top], i);
+ if (ni->mn_flags & F_SUBDATA) {
+ mdb_xcursor_init1(mc, ni);
+ rc = mdb_drop0(&mc->mc_xcursor->mx_cursor, 0);
+ if (rc)
+ return rc;
+ }
+ }
+ } else {
+ for (i=0; i<NUMKEYS(mc->mc_pg[mc->mc_top]); i++) {
+ pgno_t pg;
+ ni = NODEPTR(mc->mc_pg[mc->mc_top], i);
+ pg = NODEPGNO(ni);
+ /* free it */
+ mdb_midl_append(&mc->mc_txn->mt_free_pgs, pg);
+ }
+ }
+ if (!mc->mc_top)
+ break;
+ rc = mdb_cursor_sibling(mc, 1);
+ if (rc) {
+ /* no more siblings, go back to beginning
+ * of previous level. (stack was already popped
+ * by mdb_cursor_sibling)
+ */
+ for (i=1; i<mc->mc_top; i++)
+ mc->mc_pg[i] = mx.mc_pg[i];
+ }
+ }
+ /* free it */
+ mdb_midl_append(&mc->mc_txn->mt_free_pgs,
+ mc->mc_db->md_root);
+ }
+ return 0;
+}
+
+int mdb_drop(MDB_txn *txn, MDB_dbi dbi, int del)
+{
+ MDB_cursor *mc;
+ int rc;
+
+ if (!txn || !dbi || dbi >= txn->mt_numdbs)
+ return EINVAL;
+
+ if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY))
+ return EACCES;
+
+ rc = mdb_cursor_open(txn, dbi, &mc);
+ if (rc)
+ return rc;
+
+ rc = mdb_drop0(mc, mc->mc_db->md_flags & MDB_DUPSORT);
+ if (rc)
+ goto leave;
+
+ /* Can't delete the main DB */
+ if (del && dbi > MAIN_DBI) {
+ rc = mdb_del(txn, MAIN_DBI, &mc->mc_dbx->md_name, NULL);
+ if (!rc)
+ mdb_close(txn->mt_env, dbi);
+ } else {
+ txn->mt_dbflags[dbi] |= DB_DIRTY;
+ txn->mt_dbs[dbi].md_depth = 0;
+ txn->mt_dbs[dbi].md_branch_pages = 0;
+ txn->mt_dbs[dbi].md_leaf_pages = 0;
+ txn->mt_dbs[dbi].md_overflow_pages = 0;
+ txn->mt_dbs[dbi].md_entries = 0;
+ txn->mt_dbs[dbi].md_root = P_INVALID;
+ }
+leave:
+ mdb_cursor_close(mc);
+ return rc;
+}
+
int mdb_set_compare(MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp)
{
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs)
return MDB_SUCCESS;
}
+int mdb_set_relctx(MDB_txn *txn, MDB_dbi dbi, void *ctx)
+{
+ if (txn == NULL || !dbi || dbi >= txn->mt_numdbs)
+ return EINVAL;
+
+ txn->mt_dbxs[dbi].md_relctx = ctx;
+ return MDB_SUCCESS;
+}
+
/** @} */
projects / openldap / blobdiff