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save time when creating a slab from another slab

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the dns_rdataslab_fromrdataset() function creates a slab
from an rdataset. if the source rdataset already uses a slab,
then no processing is necessary; we can just copy the existing
slab to a new location.
This commit is contained in:
Evan Hunt
2025-02-24 21:30:10 -08:00
parent 796b662b92
commit 94a96a7a0e
1 changed files with 38 additions and 27 deletions
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65
lib/dns/rdataslab.c
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@@ -119,6 +119,24 @@ static bool
rdataset_equals(const dns_rdataset_t *rdataset1,
const dns_rdataset_t *rdataset2);
dns_rdatasetmethods_t dns_rdataslab_rdatasetmethods = {
.disassociate = rdataset_disassociate,
.first = rdataset_first,
.next = rdataset_next,
.current = rdataset_current,
.clone = rdataset_clone,
.count = rdataset_count,
.getnoqname = rdataset_getnoqname,
.getclosest = rdataset_getclosest,
.settrust = rdataset_settrust,
.expire = rdataset_expire,
.clearprefetch = rdataset_clearprefetch,
.setownercase = rdataset_setownercase,
.getownercase = rdataset_getownercase,
.getheader = rdataset_getheader,
.equals = rdataset_equals,
};
/*% Note: the "const void *" are just to make qsort happy. */
static int
compare_rdata(const void *p1, const void *p2) {
@@ -136,7 +154,7 @@ makeslab(dns_rdataset_t *rdataset, isc_mem_t *mctx, isc_region_t *region,
dns_rdata_t *rdata = NULL;
unsigned char *rawbuf = NULL;
unsigned int headerlen = sizeof(dns_slabheader_t);
unsigned int buflen;
unsigned int buflen = headerlen + 2;
isc_result_t result;
unsigned int nitems;
unsigned int nalloc;
@@ -144,14 +162,28 @@ makeslab(dns_rdataset_t *rdataset, isc_mem_t *mctx, isc_region_t *region,
size_t i;
size_t rdatasize;
buflen = headerlen + 2;
/*
* If the source rdataset is also a slab, we don't need
* to do anything special, just copy the whole slab to a
* new buffer.
*/
if (rdataset->methods == &dns_rdataslab_rdatasetmethods) {
dns_slabheader_t *header = dns_rdataset_getheader(rdataset);
buflen = dns_rdataslab_size(header);
nitems = dns_rdataset_count(rdataset);
rawbuf = isc_mem_get(mctx, buflen);
region->base = rawbuf;
region->length = buflen;
memmove(rawbuf, header, buflen);
return ISC_R_SUCCESS;
}
/*
* If there are no rdata then we can just need to allocate a header
* with zero a record count.
* If there are no rdata then we just need to allocate a header
* with a zero record count.
*/
nitems = dns_rdataset_count(rdataset);
if (nitems == 0) {
if (rdataset->type != 0) {
return ISC_R_FAILURE;
@@ -160,8 +192,7 @@ makeslab(dns_rdataset_t *rdataset, isc_mem_t *mctx, isc_region_t *region,
region->base = rawbuf;
region->length = buflen;
rawbuf += headerlen;
*rawbuf++ = 0;
*rawbuf = 0;
put_uint16(rawbuf, 0);
return ISC_R_SUCCESS;
}
@@ -269,9 +300,7 @@ makeslab(dns_rdataset_t *rdataset, isc_mem_t *mctx, isc_region_t *region,
region->base = rawbuf;
region->length = buflen;
rawbuf += headerlen;
put_uint16(rawbuf, nitems);
for (i = 0; i < nalloc; i++) {
@@ -931,24 +960,6 @@ dns_slabheader_top(dns_slabheader_t *header) {
return header;
}
dns_rdatasetmethods_t dns_rdataslab_rdatasetmethods = {
.disassociate = rdataset_disassociate,
.first = rdataset_first,
.next = rdataset_next,
.current = rdataset_current,
.clone = rdataset_clone,
.count = rdataset_count,
.getnoqname = rdataset_getnoqname,
.getclosest = rdataset_getclosest,
.settrust = rdataset_settrust,
.expire = rdataset_expire,
.clearprefetch = rdataset_clearprefetch,
.setownercase = rdataset_setownercase,
.getownercase = rdataset_getownercase,
.getheader = rdataset_getheader,
.equals = rdataset_equals,
};
/* Fixed RRSet helper macros */
#define DNS_RDATASET_LENGTH 2;