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tdb: add utility function check_merge_with_left_record()

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Check whether the record left of a given freelist record is
also a freelist record, and if so, merge the two records.

Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
This commit is contained in:
Michael Adam 2014-06-11 12:00:48 +02:00 committed by Volker Lendecke
parent 66f3330be8
commit 117807cd2d
1 changed files with 50 additions and 0 deletions
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50
lib/tdb/common/freelist.c
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@ -190,6 +190,56 @@ static int merge_with_left_record(struct tdb_context *tdb,
return 0;
}
/**
* Check whether the record left of a given freelist record is
* also a freelist record, and if so, merge the two records.
*
* Return code:
* -1 upon error
* 0 if left was not a free record
* 1 if left was free and successfully merged.
*
* The currend record is handed in with pointer and fully read record.
*
* The left record pointer and struct can be retrieved as result
* in lp and lr;
*/
static int check_merge_with_left_record(struct tdb_context *tdb,
tdb_off_t rec_ptr,
struct tdb_record *rec,
tdb_off_t *lp,
struct tdb_record *lr)
{
tdb_off_t left_ptr;
struct tdb_record left_rec;
int ret;
ret = read_record_on_left(tdb, rec_ptr, &left_ptr, &left_rec);
if (ret != 0) {
return 0;
}
if (left_rec.magic != TDB_FREE_MAGIC) {
return 0;
}
/* It's free - expand to include it. */
ret = merge_with_left_record(tdb, left_ptr, &left_rec, rec);
if (ret != 0) {
return -1;
}
if (lp != NULL) {
*lp = left_ptr;
}
if (lr != NULL) {
*lr = left_rec;
}
return 1;
}
/**
* Add an element into the freelist.
*