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Tweaks for MDB_MULTIPLE

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Terminate loop on intermediate failures, return count of written items,
document usage.
This commit is contained in:
Howard Chu 2013-07-02 02:19:17 -07:00
parent fb674c1cf5
commit 589370d880
2 changed files with 33 additions and 9 deletions
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12
libraries/liblmdb/lmdb.h
View file

@ -309,7 +309,7 @@ typedef void (MDB_rel_func)(MDB_val *item, void *oldptr, void *newptr, void *rel
#define MDB_APPEND 0x20000
/** Duplicate data is being appended, don't split full pages. */
#define MDB_APPENDDUP 0x40000
/** Store multiple data items in one call. */
/** Store multiple data items in one call. Only for #MDB_DUPFIXED. */
#define MDB_MULTIPLE 0x80000
/* @} */
@ -1210,6 +1210,16 @@ int mdb_cursor_get(MDB_cursor *cursor, MDB_val *key, MDB_val *data,
* correct order. Loading unsorted keys with this flag will cause
* data corruption.
* <li>#MDB_APPENDDUP - as above, but for sorted dup data.
* <li>#MDB_MULTIPLE - store multiple contiguous data elements in a
* single request. This flag may only be specified if the database
* was opened with #MDB_DUPFIXED. The \b data argument must be an
* array of two MDB_vals. The mv_size of the first MDB_val must be
* the size of a single data element. The mv_data of the first MDB_val
* must point to the beginning of the array of contiguous data elements.
* The mv_size of the second MDB_val must be the count of the number
* of data elements to store. On return this field will be set to
* the count of the number of elements actually written. The mv_data
* of the second MDB_val is unused.
* </ul>
* @return A non-zero error value on failure and 0 on success. Some possible
* errors are:

18
libraries/liblmdb/mdb.c
View file

@ -4969,7 +4969,7 @@ mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
MDB_page *fp;
MDB_db dummy;
int do_sub = 0, insert = 0;
unsigned int mcount = 0;
unsigned int mcount = 0, dcount;
size_t nsize;
int rc, rc2;
MDB_pagebuf pbuf;
@ -4977,6 +4977,16 @@ mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
unsigned int nflags;
DKBUF;
/* Check this first so counter will always be zero on any
* early failures.
*/
if (flags & MDB_MULTIPLE) {
dcount = data[1].mv_size;
data[1].mv_size = 0;
if (!F_ISSET(mc->mc_db->md_flags, MDB_DUPFIXED))
return EINVAL;
}
if (F_ISSET(mc->mc_txn->mt_flags, MDB_TXN_RDONLY))
return EACCES;
@ -5357,13 +5367,17 @@ put_sub:
if (!rc && !(flags & MDB_CURRENT))
mc->mc_db->md_entries++;
if (flags & MDB_MULTIPLE) {
if (!rc) {
mcount++;
if (mcount < data[1].mv_size) {
if (mcount < dcount) {
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;
}
}
/* let caller know how many succeeded, if any */
data[1].mv_size = mcount;
}
}
done:
/* If we succeeded and the key didn't exist before, make sure