From 11d4f1d2feae160caa35c4eb8565c969dc16a24d Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Wed, 12 Dec 2012 10:31:06 -0500 Subject: [PATCH] mountd: Report the absolute path used to load the junction plug-in As a debugging feature, report the absolute pathname of the plug-in library that mountd loads to resolve junctions. Since mountd passes a relative path to dlopen(3), dlopen(3) must search for the right library. Displaying the absolute pathname of the object that it found verifies that mountd loaded the correct plug-in. Note: dlinfo(3) is provided by libdl, but there doesn't seem to be a man page on Fedora 16 for dlinfo(3). Instead, see: http://www.unix.com/man-page/all/3/dlinfo/ Signed-off-by: Chuck Lever Signed-off-by: Steve Dickson --- utils/mountd/cache.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c index c264e14..3853bb6 100644 --- a/utils/mountd/cache.c +++ b/utils/mountd/cache.c @@ -826,6 +826,7 @@ lookup_export(char *dom, char *path, struct addrinfo *ai) #ifdef HAVE_NFS_PLUGIN_H #include +#include #include /* @@ -1090,6 +1091,7 @@ static struct exportent *lookup_junction(char *dom, const char *pathname, struct addrinfo *ai) { struct exportent *exp; + struct link_map *map; void *handle; handle = dlopen("libnfsjunct.so", RTLD_NOW); @@ -1097,6 +1099,11 @@ static struct exportent *lookup_junction(char *dom, const char *pathname, xlog(D_GENERAL, "%s: dlopen: %s", __func__, dlerror()); return NULL; } + + if (dlinfo(handle, RTLD_DI_LINKMAP, &map) == 0) + xlog(D_GENERAL, "%s: loaded plug-in %s", + __func__, map->l_name); + (void)dlerror(); /* Clear any error */ exp = invoke_junction_ops(handle, dom, pathname, ai); -- 2.39.5