mirror/openldap
2
0
Fork 0
mirror of https://git.openldap.org/openldap/openldap.git synced 2025-01-06 10:46:21 +08:00
Code Issues Packages Projects Releases Wiki Activity

More pgno alignment tweaks

Browse Source
This commit is contained in:
Howard Chu 2011-11-09 00:36:50 -08:00
parent 690792c170
commit 68143e4532
1 changed files with 27 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
libraries/libmdb/mdb.c
View File

@ -669,6 +669,30 @@ typedef struct MDB_node {
/** 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.
@ -4015,18 +4039,7 @@ more:
fp = NODEDATA(leaf);
if (flags == MDB_CURRENT) {
fp->mp_flags |= P_DIRTY;
#ifdef MISALIGNED_OK
fp->mp_pgno = mc->mc_pg[mc->mc_top]->mp_pgno;
#else
{
unsigned short *src, *dst;
int i;
dst = (unsigned short *)&fp->mp_pgno;
src = (unsigned short *)&mc->mc_pg[mc->mc_top]->mp_pgno;
for (i=0; i<sizeof(fp->mp_pgno)/sizeof(unsigned short); i++)
*dst++ = *src++;
}
#endif
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;
@ -4566,7 +4579,7 @@ mdb_node_shrink(MDB_page *mp, indx_t indx)
xp->mp_lower = sp->mp_lower;
xp->mp_flags = sp->mp_flags;
xp->mp_pad = sp->mp_pad;
xp->mp_pgno = mp->mp_pgno;
COPY_PGNO(xp->mp_pgno, mp->mp_pgno);
/* shift lower nodes upward */
ptr = mp->mp_ptrs[indx];
@ -4633,18 +4646,7 @@ mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
mx->mx_db.md_leaf_pages = 1;
mx->mx_db.md_overflow_pages = 0;
mx->mx_db.md_entries = NUMKEYS(fp);
#ifdef MISALIGNED_OK
mx->mx_db.md_root = fp->mp_pgno;
#else
{
unsigned short *src, *dst;
int i;
dst = (unsigned short *)&mx->mx_db.md_root;
src = (unsigned short *)&fp->mp_pgno;
for (i=0; i<sizeof(fp->mp_pgno)/sizeof(unsigned short); i++)
*dst++ = *src++;
}
#endif
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;