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Add txnID to page header

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incre
Howard Chu 10 years ago
parent 61f7ec9bfa
commit 27d69186c1
1 changed files with 50 additions and 38 deletions
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  1. 88
      libraries/liblmdb/mdb.c

88
libraries/liblmdb/mdb.c
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@ -408,7 +408,7 @@ static txnid_t mdb_debug_start;
#define MDB_MAGIC 0xBEEFC0DE
/** The version number for a database's datafile format. */
#define MDB_DATA_VERSION 1
#define MDB_DATA_VERSION 2
/** The version number for a database's lockfile format. */
#define MDB_LOCK_VERSION 1
@ -684,6 +684,7 @@ typedef struct MDB_page {
} pb;
uint32_t pb_pages; /**< number of overflow pages */
} mp_pb;
txnid_t mp_txnid; /**< ID of txn that wrote this page */
indx_t mp_ptrs[1]; /**< dynamic size */
} MDB_page;
@ -868,7 +869,7 @@ typedef struct MDB_meta {
/** Stamp identifying this as an LMDB file. It must be set
* to #MDB_MAGIC. */
uint32_t mm_magic;
/** Version number of this lock file. Must be set to #MDB_DATA_VERSION. */
/** Version number of this data file. Must be set to #MDB_DATA_VERSION. */
uint32_t mm_version;
void *mm_address; /**< address for fixed mapping */
size_t mm_mapsize; /**< size of mmap region */
@ -878,7 +879,6 @@ typedef struct MDB_meta {
/** 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 */
txnid_t mm_txnid; /**< txnid that committed this page */
} MDB_meta;
/** Buffer for a stack-allocated meta page.
@ -1074,6 +1074,7 @@ struct MDB_env {
char *me_map; /**< the memory map of the data file */
MDB_txninfo *me_txns; /**< the memory map of the lock file or NULL */
MDB_meta *me_metas[2]; /**< pointers to the two meta pages */
MDB_page *me_mpage[2]; /**< pointers to the two meta pages */
void *me_pbuf; /**< scratch area for DUPSORT put() */
MDB_txn *me_txn; /**< current write transaction */
size_t me_mapsize; /**< size of the data memory map */
@ -1346,7 +1347,7 @@ mdb_page_list(MDB_page *mp)
return;
case P_META:
fprintf(stderr, "Meta-page %"Z"u txnid %"Z"u\n",
pgno, ((MDB_meta *)METADATA(mp))->mm_txnid);
pgno, mp->mp_txnid);
return;
default:
fprintf(stderr, "Bad page %"Z"u flags 0x%u\n", pgno, mp->mp_flags);
@ -2014,6 +2015,7 @@ search_done:
txn->mt_next_pgno = pgno + num;
}
np->mp_pgno = pgno;
np->mp_txnid = txn->mt_txnid;
mdb_page_dirty(txn, np);
*mp = np;
@ -2180,6 +2182,7 @@ mdb_page_touch(MDB_cursor *mc)
mdb_page_copy(np, mp, txn->mt_env->me_psize);
np->mp_pgno = pgno;
np->mp_txnid = txn->mt_txnid;
np->mp_flags |= P_DIRTY;
done:
@ -2388,7 +2391,7 @@ mdb_txn_renew0(MDB_txn *txn)
MDB_meta *meta;
unsigned int i, nr;
uint16_t x;
int rc, new_notls = 0;
int rc, new_notls = 0, mtoggle;
/* Setup db info */
txn->mt_numdbs = env->me_numdbs;
@ -2396,8 +2399,9 @@ mdb_txn_renew0(MDB_txn *txn)
if (txn->mt_flags & MDB_TXN_RDONLY) {
if (!ti) {
meta = env->me_metas[ mdb_env_pick_meta(env) ];
txn->mt_txnid = meta->mm_txnid;
mtoggle = mdb_env_pick_meta(env);
meta = env->me_metas[mtoggle];
txn->mt_txnid = env->me_mpage[mtoggle]->mp_txnid;
txn->mt_u.reader = NULL;
} else {
MDB_reader *r = (env->me_flags & MDB_NOTLS) ? txn->mt_u.reader :
@ -2442,17 +2446,20 @@ mdb_txn_renew0(MDB_txn *txn)
}
txn->mt_txnid = r->mr_txnid = ti->mti_txnid;
txn->mt_u.reader = r;
meta = env->me_metas[txn->mt_txnid & 1];
mtoggle = txn->mt_txnid & 1;
meta = env->me_metas[mtoggle];
}
} else {
if (ti) {
LOCK_MUTEX_W(env);
txn->mt_txnid = ti->mti_txnid;
meta = env->me_metas[txn->mt_txnid & 1];
mtoggle = txn->mt_txnid & 1;
meta = env->me_metas[mtoggle];
} else {
meta = env->me_metas[ mdb_env_pick_meta(env) ];
txn->mt_txnid = meta->mm_txnid;
mtoggle = mdb_env_pick_meta(env);
meta = env->me_metas[mtoggle];
txn->mt_txnid = env->me_mpage[mtoggle]->mp_txnid;
}
txn->mt_txnid++;
#if MDB_DEBUG
@ -3271,6 +3278,7 @@ mdb_env_read_header(MDB_env *env, MDB_meta *meta)
MDB_meta *m;
int i, rc, off;
enum { Size = sizeof(pbuf) };
txnid_t txnid = 0;
/* We don't know the page size yet, so use a minimum value.
* Read both meta pages so we can use the latest one.
@ -3315,8 +3323,10 @@ mdb_env_read_header(MDB_env *env, MDB_meta *meta)
return MDB_VERSION_MISMATCH;
}
if (off == 0 || m->mm_txnid > meta->mm_txnid)
if (off == 0 || p->mp_txnid > txnid) {
*meta = *m;
txnid = p->mp_txnid;
}
}
return 0;
}
@ -3395,7 +3405,9 @@ static int
mdb_env_write_meta(MDB_txn *txn)
{
MDB_env *env;
MDB_meta meta, metab, *mp;
char pbuf0[PAGEHDRSZ + sizeof(MDB_meta)], pbuf1[PAGEHDRSZ + sizeof(MDB_meta)];
MDB_meta *meta, *metab, *mp;
MDB_page *mmp, *mb0, *mb1;
off_t off;
int rc, len, toggle;
char *ptr;
@ -3412,6 +3424,7 @@ mdb_env_write_meta(MDB_txn *txn)
env = txn->mt_env;
mp = env->me_metas[toggle];
mmp = env->me_mpage[toggle];
if (env->me_flags & MDB_WRITEMAP) {
/* Persist any increases of mapsize config */
@ -3420,7 +3433,7 @@ mdb_env_write_meta(MDB_txn *txn)
mp->mm_dbs[0] = txn->mt_dbs[0];
mp->mm_dbs[1] = txn->mt_dbs[1];
mp->mm_last_pg = txn->mt_next_pgno - 1;
mp->mm_txnid = txn->mt_txnid;
mmp->mp_txnid = txn->mt_txnid;
if (!(env->me_flags & (MDB_NOMETASYNC|MDB_NOSYNC))) {
unsigned meta_size = env->me_psize;
rc = (env->me_flags & MDB_MAPASYNC) ? MS_ASYNC : MS_SYNC;
@ -3440,28 +3453,25 @@ mdb_env_write_meta(MDB_txn *txn)
}
goto done;
}
metab.mm_txnid = env->me_metas[toggle]->mm_txnid;
metab.mm_last_pg = env->me_metas[toggle]->mm_last_pg;
mb0 = (MDB_page *)pbuf0;
mb1 = (MDB_page *)pbuf1;
metab = METADATA(mb0);
meta = METADATA(mb1);
mb0->mp_txnid = mmp->mp_txnid;
*metab = *mp;
*meta = *mp;
ptr = (char *)&meta;
if (env->me_mapsize > mp->mm_mapsize) {
/* Persist any increases of mapsize config */
meta.mm_mapsize = env->me_mapsize;
off = offsetof(MDB_meta, mm_mapsize);
} else {
off = offsetof(MDB_meta, mm_dbs[0].md_depth);
}
len = sizeof(MDB_meta) - off;
len = sizeof(MDB_meta) + sizeof(txnid_t);
off = offsetof(MDB_page, mp_txnid);
ptr = pbuf1 + off;
ptr += off;
meta.mm_dbs[0] = txn->mt_dbs[0];
meta.mm_dbs[1] = txn->mt_dbs[1];
meta.mm_last_pg = txn->mt_next_pgno - 1;
meta.mm_txnid = txn->mt_txnid;
meta->mm_dbs[0] = txn->mt_dbs[0];
meta->mm_dbs[1] = txn->mt_dbs[1];
meta->mm_last_pg = txn->mt_next_pgno - 1;
mb1->mp_txnid = txn->mt_txnid;
if (toggle)
off += env->me_psize;
off += PAGEHDRSZ;
/* Write to the SYNC fd */
mfd = env->me_flags & (MDB_NOSYNC|MDB_NOMETASYNC) ?
@ -3483,8 +3493,7 @@ mdb_env_write_meta(MDB_txn *txn)
* Write some old data back, to prevent it from being used.
* Use the non-SYNC fd; we know it will fail anyway.
*/
meta.mm_last_pg = metab.mm_last_pg;
meta.mm_txnid = metab.mm_txnid;
ptr = pbuf0 + off;
#ifdef _WIN32
memset(&ov, 0, sizeof(ov));
ov.Offset = off;
@ -3517,7 +3526,7 @@ done:
static int
mdb_env_pick_meta(const MDB_env *env)
{
return (env->me_metas[0]->mm_txnid < env->me_metas[1]->mm_txnid);
return (env->me_mpage[0]->mp_txnid < env->me_mpage[1]->mp_txnid);
}
int ESECT
@ -3622,8 +3631,10 @@ mdb_env_map(MDB_env *env, void *addr, int newsize)
return EBUSY; /* TODO: Make a new MDB_* error code? */
p = (MDB_page *)env->me_map;
env->me_mpage[0] = p;
env->me_mpage[1] = (MDB_page *)((char *)p + env->me_psize);
env->me_metas[0] = METADATA(p);
env->me_metas[1] = (MDB_meta *)((char *)env->me_metas[0] + env->me_psize);
env->me_metas[1] = METADATA(env->me_mpage[1]);
return MDB_SUCCESS;
}
@ -3853,7 +3864,7 @@ mdb_env_share_locks(MDB_env *env, int *excl)
{
int rc = 0, toggle = mdb_env_pick_meta(env);
env->me_txns->mti_txnid = env->me_metas[toggle]->mm_txnid;
env->me_txns->mti_txnid = env->me_mpage[toggle]->mp_txnid;
#ifdef _WIN32
{
@ -8286,6 +8297,7 @@ again:
mo = (MDB_page *)(my->mc_wbuf[toggle] + my->mc_wlen[toggle]);
mdb_page_copy(mo, mp, my->mc_env->me_psize);
mo->mp_pgno = my->mc_next_pgno++;
mo->mp_txnid = 1;
my->mc_wlen[toggle] += my->mc_env->me_psize;
if (mc.mc_top) {
/* Update parent if there is one */
@ -8393,7 +8405,7 @@ mdb_env_copyfd1(MDB_env *env, HANDLE fd)
mm->mm_last_pg = txn->mt_next_pgno - freecount - 1;
mm->mm_dbs[1] = txn->mt_dbs[1];
mm->mm_dbs[1].md_root = mm->mm_last_pg;
mm->mm_txnid = 1;
mp->mp_txnid = 1;
}
my.mc_wlen[0] = env->me_psize * 2;
my.mc_txn = txn;
@ -8727,7 +8739,7 @@ mdb_env_info(MDB_env *env, MDB_envinfo *arg)
arg->me_numreaders = env->me_txns ? env->me_txns->mti_numreaders : env->me_numreaders;
arg->me_last_pgno = env->me_metas[toggle]->mm_last_pg;
arg->me_last_txnid = env->me_metas[toggle]->mm_txnid;
arg->me_last_txnid = env->me_mpage[toggle]->mp_txnid;
return MDB_SUCCESS;
}

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