|
 |
beb904 |
autofs-5.1.7 - dont use realloc in host exports list processing
|
|
|
beb904 |
|
|
|
beb904 |
From: Ian Kent <raven@themaw.net>
|
|
|
beb904 |
|
|
|
beb904 |
If a server exports list is very large calling realloc(3) for each
|
|
|
beb904 |
export is slow. It's better to traverse the exports list twice, once
|
|
|
beb904 |
to calculate the length of the mapent then allocate the memory and
|
|
|
beb904 |
traverse the exports list again to construct the mapent.
|
|
|
beb904 |
|
|
|
beb904 |
Signed-off-by: Ian Kent <raven@themaw.net>
|
|
|
beb904 |
---
|
|
|
beb904 |
CHANGELOG | 1 +
|
|
|
beb904 |
modules/lookup_hosts.c | 59 +++++++++++++++++++++---------------------------
|
|
|
beb904 |
2 files changed, 27 insertions(+), 33 deletions(-)
|
|
|
beb904 |
|
|
|
beb904 |
--- autofs-5.1.4.orig/CHANGELOG
|
|
|
beb904 |
+++ autofs-5.1.4/CHANGELOG
|
|
|
beb904 |
@@ -1,6 +1,7 @@
|
|
|
beb904 |
|
|
|
beb904 |
- add xdr_exports().
|
|
|
beb904 |
- remove mount.x and rpcgen dependencies.
|
|
|
beb904 |
+- dont use realloc in host exports list processing.
|
|
|
beb904 |
|
|
|
beb904 |
xx/xx/2018 autofs-5.1.5
|
|
|
beb904 |
- fix flag file permission.
|
|
|
beb904 |
--- autofs-5.1.4.orig/modules/lookup_hosts.c
|
|
|
beb904 |
+++ autofs-5.1.4/modules/lookup_hosts.c
|
|
|
beb904 |
@@ -89,44 +89,40 @@ static char *get_exports(struct autofs_p
|
|
|
beb904 |
char buf[MAX_ERR_BUF];
|
|
|
beb904 |
char *mapent;
|
|
|
beb904 |
struct exportinfo *exp, *this;
|
|
|
beb904 |
+ size_t hostlen = strlen(host);
|
|
|
beb904 |
+ size_t mapent_len;
|
|
|
beb904 |
|
|
|
beb904 |
debug(ap->logopt, MODPREFIX "fetchng export list for %s", host);
|
|
|
beb904 |
|
|
|
beb904 |
exp = rpc_get_exports(host, 10, 0, RPC_CLOSE_NOLINGER);
|
|
|
beb904 |
|
|
|
beb904 |
- mapent = NULL;
|
|
|
beb904 |
this = exp;
|
|
|
beb904 |
+ mapent_len = 0;
|
|
|
beb904 |
while (this) {
|
|
|
beb904 |
- if (mapent) {
|
|
|
beb904 |
- int len = strlen(mapent) + 1;
|
|
|
beb904 |
+ mapent_len += hostlen + 2*(strlen(this->dir) + 2) + 3;
|
|
|
beb904 |
+ this = this->next;
|
|
|
beb904 |
+ }
|
|
|
beb904 |
|
|
|
beb904 |
- len += strlen(host) + 2*(strlen(this->dir) + 2) + 3;
|
|
|
beb904 |
- mapent = realloc(mapent, len);
|
|
|
beb904 |
- if (!mapent) {
|
|
|
beb904 |
- char *estr;
|
|
|
beb904 |
- estr = strerror_r(errno, buf, MAX_ERR_BUF);
|
|
|
beb904 |
- error(ap->logopt, MODPREFIX "malloc: %s", estr);
|
|
|
beb904 |
- rpc_exports_free(exp);
|
|
|
beb904 |
- return NULL;
|
|
|
beb904 |
- }
|
|
|
beb904 |
- strcat(mapent, " \"");
|
|
|
beb904 |
- strcat(mapent, this->dir);
|
|
|
beb904 |
- strcat(mapent, "\"");
|
|
|
beb904 |
- } else {
|
|
|
beb904 |
- int len = 2*(strlen(this->dir) + 2) + strlen(host) + 3;
|
|
|
beb904 |
-
|
|
|
beb904 |
- mapent = malloc(len);
|
|
|
beb904 |
- if (!mapent) {
|
|
|
beb904 |
- char *estr;
|
|
|
beb904 |
- estr = strerror_r(errno, buf, MAX_ERR_BUF);
|
|
|
beb904 |
- error(ap->logopt, MODPREFIX "malloc: %s", estr);
|
|
|
beb904 |
- rpc_exports_free(exp);
|
|
|
beb904 |
- return NULL;
|
|
|
beb904 |
- }
|
|
|
beb904 |
+ mapent = malloc(mapent_len + 1);
|
|
|
beb904 |
+ if (!mapent) {
|
|
|
beb904 |
+ char *estr;
|
|
|
beb904 |
+ estr = strerror_r(errno, buf, MAX_ERR_BUF);
|
|
|
beb904 |
+ error(ap->logopt, MODPREFIX "malloc: %s", estr);
|
|
|
beb904 |
+ error(ap->logopt, MODPREFIX "exports lookup failed for %s", host);
|
|
|
beb904 |
+ rpc_exports_free(exp);
|
|
|
beb904 |
+ return NULL;
|
|
|
beb904 |
+ }
|
|
|
beb904 |
+ *mapent = 0;
|
|
|
beb904 |
+
|
|
|
beb904 |
+ this = exp;
|
|
|
beb904 |
+ while (this) {
|
|
|
beb904 |
+ if (!*mapent)
|
|
|
beb904 |
strcpy(mapent, "\"");
|
|
|
beb904 |
- strcat(mapent, this->dir);
|
|
|
beb904 |
- strcat(mapent, "\"");
|
|
|
beb904 |
- }
|
|
|
beb904 |
+ else
|
|
|
beb904 |
+ strcat(mapent, " \"");
|
|
|
beb904 |
+ strcat(mapent, this->dir);
|
|
|
beb904 |
+ strcat(mapent, "\"");
|
|
|
beb904 |
+
|
|
|
beb904 |
strcat(mapent, " \"");
|
|
|
beb904 |
strcat(mapent, host);
|
|
|
beb904 |
strcat(mapent, ":");
|
|
|
beb904 |
@@ -137,9 +133,6 @@ static char *get_exports(struct autofs_p
|
|
|
beb904 |
}
|
|
|
beb904 |
rpc_exports_free(exp);
|
|
|
beb904 |
|
|
|
beb904 |
- if (!mapent)
|
|
|
beb904 |
- error(ap->logopt, MODPREFIX "exports lookup failed for %s", host);
|
|
|
beb904 |
-
|
|
|
beb904 |
return mapent;
|
|
|
beb904 |
}
|
|
|
beb904 |
|