further work on modprobe
function old new delta gather_options_str - 75 +75 config_file_action 388 413 +25 load_modules_dep 175 192 +17 add_probe 67 72 +5 modprobe_main 494 488 -6 gather_options 89 - -89 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 3/1 up/down: 122/-95) Total: 27 bytes
This commit is contained in:
Denis Vlasenko
parent
8517d6fc1f
commit
a6b6f05379
@ -13,18 +13,23 @@
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#include <sys/utsname.h>
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#include <fnmatch.h>
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//#define DBG(...) bb_error_msg(__VA_ARGS__)
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#define DBG(...) ((void)0)
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#define MODULE_FLAG_LOADED 0x0001
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#define MODULE_FLAG_NEED_DEPS 0x0002
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//Misnomer? Seems to mean "was seen in modules.dep":
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#define MODULE_FLAG_EXISTS 0x0004
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/* "was seen in modules.dep": */
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#define MODULE_FLAG_FOUND_IN_MODDEP 0x0004
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#define MODULE_FLAG_BLACKLISTED 0x0008
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struct module_entry { /* I'll call it ME. */
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unsigned flags;
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char *modname; /* stripped of /path/, .ext and s/-/_/g */
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const char *probed_name; /* verbatim as seen on cmdline */
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llist_t *aliases; /* strings. aliases from config files */
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llist_t *options; /* strings. options from config files */
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char *options; /* options from config files */
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llist_t *realnames; /* strings. if this module is an alias, */
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/* real module name is one of these. */
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//Can there really be more than one? Example from real kernel?
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llist_t *deps; /* strings. modules we depend on */
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};
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@ -45,8 +50,8 @@ enum {
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struct globals {
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llist_t *db; /* MEs of all modules ever seen (caching for speed) */
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llist_t *probes; /* MEs of module(s) requested on cmdline */
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llist_t *cmdline_mopts; /* strings. module options (from cmdline) */
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int num_deps; /* what is this? */
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char *cmdline_mopts; /* module options from cmdline */
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int num_unresolved_deps;
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/* bool. "Did we have 'symbol:FOO' requested on cmdline?" */
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smallint need_symbols;
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};
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@ -56,6 +61,19 @@ struct globals {
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static int read_config(const char *path);
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static char *gather_options_str(char *opts, const char *append)
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{
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/* Speed-optimized. We call gather_options_str many times. */
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if (opts == NULL) {
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opts = xstrdup(append);
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} else {
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int optlen = strlen(opts);
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opts = xrealloc(opts, optlen + strlen(append) + 2);
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sprintf(opts + optlen, " %s", append);
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}
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return opts;
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}
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static struct module_entry *helper_get_module(const char *module, int create)
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{
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char modname[MODULE_NAME_LEN];
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@ -91,14 +109,20 @@ static void add_probe(const char *name)
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struct module_entry *m;
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m = get_or_add_modentry(name);
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if (m->flags & MODULE_FLAG_LOADED) {
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DBG("skipping %s, it is already loaded", name);
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return;
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}
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m->probed_name = name;
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m->flags |= MODULE_FLAG_NEED_DEPS;
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llist_add_to(&G.probes, m);
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G.num_deps++;
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llist_add_to_end(&G.probes, m);
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G.num_unresolved_deps++;
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if (ENABLE_FEATURE_MODUTILS_SYMBOLS
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&& strncmp(m->modname, "symbol:", 7) == 0)
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&& strncmp(m->modname, "symbol:", 7) == 0
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) {
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G.need_symbols = 1;
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}
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}
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static int FAST_FUNC config_file_action(const char *filename,
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@ -106,10 +130,8 @@ static int FAST_FUNC config_file_action(const char *filename,
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void *userdata UNUSED_PARAM,
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int depth UNUSED_PARAM)
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{
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RESERVE_CONFIG_BUFFER(modname, MODULE_NAME_LEN);
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char *tokens[3], *rmod;
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char *tokens[3];
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parser_t *p;
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llist_t *l;
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struct module_entry *m;
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int rc = TRUE;
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@ -125,42 +147,51 @@ static int FAST_FUNC config_file_action(const char *filename,
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while (config_read(p, tokens, 3, 2, "# \t", PARSE_NORMAL)) {
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//Use index_in_strings?
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if (strcmp(tokens[0], "alias") == 0) {
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filename2modname(tokens[1], modname);
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/* alias <wildcard> <modulename> */
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llist_t *l;
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char wildcard[MODULE_NAME_LEN];
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char *rmod;
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if (tokens[2] == NULL)
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continue;
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filename2modname(tokens[1], wildcard);
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for (l = G.probes; l != NULL; l = l->link) {
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m = (struct module_entry *) l->data;
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if (fnmatch(modname, m->modname, 0) != 0)
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if (fnmatch(wildcard, m->modname, 0) != 0)
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continue;
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rmod = filename2modname(tokens[2], NULL);
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llist_add_to(&m->aliases, rmod);
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llist_add_to(&m->realnames, rmod);
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if (m->flags & MODULE_FLAG_NEED_DEPS) {
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m->flags &= ~MODULE_FLAG_NEED_DEPS;
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G.num_deps--;
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G.num_unresolved_deps--;
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}
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m = get_or_add_modentry(rmod);
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if (!(m->flags & MODULE_FLAG_NEED_DEPS)) {
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m->flags |= MODULE_FLAG_NEED_DEPS;
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G.num_deps++;
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G.num_unresolved_deps++;
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}
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}
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} else if (strcmp(tokens[0], "options") == 0) {
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/* options <modulename> <option...> */
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if (tokens[2] == NULL)
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continue;
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m = get_or_add_modentry(tokens[1]);
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llist_add_to(&m->options, xstrdup(tokens[2]));
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m->options = gather_options_str(m->options, tokens[2]);
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} else if (strcmp(tokens[0], "include") == 0) {
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/* include <filename> */
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read_config(tokens[1]);
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} else if (ENABLE_FEATURE_MODPROBE_BLACKLIST
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&& strcmp(tokens[0], "blacklist") == 0
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) {
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/* blacklist <modulename> */
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get_or_add_modentry(tokens[1])->flags |= MODULE_FLAG_BLACKLISTED;
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}
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}
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config_close(p);
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error:
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RELEASE_CONFIG_BUFFER(modname);
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return rc;
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}
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@ -170,29 +201,17 @@ static int read_config(const char *path)
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config_file_action, NULL, NULL, 1);
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}
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static char *gather_options(char *opts, llist_t *o)
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{
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int optlen;
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if (opts == NULL)
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opts = xstrdup("");
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optlen = strlen(opts);
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for (; o != NULL; o = o->link) {
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opts = xrealloc(opts, optlen + strlen(o->data) + 2);
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optlen += sprintf(opts + optlen, "%s ", o->data);
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}
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return opts;
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}
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static int do_modprobe(struct module_entry *m)
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{
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struct module_entry *m2;
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char *fn, *options;
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int rc = -1;
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if (!(m->flags & MODULE_FLAG_EXISTS))
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if (!(m->flags & MODULE_FLAG_FOUND_IN_MODDEP)) {
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DBG("skipping %s, not found in modules.dep", m->modname);
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return -ENOENT;
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}
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DBG("do_modprob'ing %s", m->modname);
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if (!(option_mask32 & MODPROBE_OPT_REMOVE))
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m->deps = llist_rev(m->deps);
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@ -205,19 +224,23 @@ static int do_modprobe(struct module_entry *m)
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if (bb_delete_module(m->modname, O_EXCL) != 0)
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rc = errno;
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} else if (!(m2->flags & MODULE_FLAG_LOADED)) {
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options = gather_options(NULL, m2->options);
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options = m2->options;
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m2->options = NULL;
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if (m == m2)
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options = gather_options(options, G.cmdline_mopts);
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//TODO: looks like G.cmdline_mopts can contain either NULL or just one string, not more?
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options = gather_options_str(options, G.cmdline_mopts);
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rc = bb_init_module(fn, options);
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DBG("loaded %s '%s', rc:%d", fn, options, rc);
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if (rc == 0)
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m2->flags |= MODULE_FLAG_LOADED;
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free(options);
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} else {
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DBG("%s is already loaded, skipping", fn);
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}
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free(fn);
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}
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//FIXME: what if rc < 0?
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if (rc > 0 && !(option_mask32 & INSMOD_OPT_SILENT)) {
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bb_error_msg("failed to %sload module %s: %s",
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(option_mask32 & MODPROBE_OPT_REMOVE) ? "un" : "",
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@ -235,17 +258,15 @@ static void load_modules_dep(void)
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char *colon, *tokens[2];
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parser_t *p;
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p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, xfopen_for_read);
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//Still true?
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/* Modprobe does not work at all without modprobe.dep,
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* even if the full module name is given. Returning error here
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* was making us later confuse user with this message:
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* "module /full/path/to/existing/file/module.ko not found".
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* It's better to die immediately, with good message: */
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// if (p == NULL)
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// bb_perror_msg_and_die("can't open '%s'", CONFIG_DEFAULT_DEPMOD_FILE);
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* It's better to die immediately, with good message.
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* xfopen_for_read provides that. */
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p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, xfopen_for_read);
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while (G.num_deps
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while (G.num_unresolved_deps
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&& config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)
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) {
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colon = last_char_is(tokens[0], ':');
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@ -256,11 +277,18 @@ static void load_modules_dep(void)
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m = get_modentry(tokens[0]);
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if (m == NULL)
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continue;
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//Can we skip it too if it is MODULE_FLAG_LOADED?
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m->flags |= MODULE_FLAG_EXISTS;
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/* Optimization... */
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if ((m->flags & MODULE_FLAG_LOADED)
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&& !(option_mask32 & MODPROBE_OPT_REMOVE)
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) {
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DBG("skip deps of %s, it's already loaded", tokens[0]);
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continue;
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}
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m->flags |= MODULE_FLAG_FOUND_IN_MODDEP;
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if ((m->flags & MODULE_FLAG_NEED_DEPS) && (m->deps == NULL)) {
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G.num_deps--;
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G.num_unresolved_deps--;
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llist_add_to(&m->deps, xstrdup(tokens[0]));
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if (tokens[1])
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string_to_llist(tokens[1], &m->deps, " ");
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@ -285,33 +313,22 @@ int modprobe_main(int argc UNUSED_PARAM, char **argv)
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MODPROBE_OPT_SHOW_ONLY))
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bb_error_msg_and_die("not supported");
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/* Goto modules location */
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xchdir(CONFIG_DEFAULT_MODULES_DIR);
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uname(&uts);
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xchdir(uts.release);
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if (!argv[0]) {
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if (opt & MODPROBE_OPT_REMOVE) {
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/* TODO: comment here */
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/* "modprobe -r" (w/o params).
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* "If name is NULL, all unused modules marked
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* autoclean will be removed".
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*/
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if (bb_delete_module(NULL, O_NONBLOCK|O_EXCL) != 0)
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bb_perror_msg_and_die("rmmod");
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}
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return EXIT_SUCCESS;
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}
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if (opt & MODPROBE_OPT_INSERT_ALL) {
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/* Each argument is a module name */
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do {
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add_probe(*argv++);
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} while (*argv);
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G.probes = llist_rev(G.probes);
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} else {
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/* First argument is module name, rest are parameters */
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add_probe(argv[0]);
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//TODO: looks like G.cmdline_mopts can contain either NULL or just one string, not more?
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//optimize it them
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llist_add_to(&G.cmdline_mopts, parse_cmdline_module_options(argv));
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}
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/* Goto modules location */
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xchdir(CONFIG_DEFAULT_MODULES_DIR);
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uname(&uts);
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xchdir(uts.release);
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/* Retrieve module names of already loaded modules */
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{
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@ -322,39 +339,58 @@ int modprobe_main(int argc UNUSED_PARAM, char **argv)
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config_close(parser);
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}
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if (opt & MODPROBE_OPT_INSERT_ALL) {
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/* Each argument is a module name */
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do {
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add_probe(*argv++);
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} while (*argv);
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} else {
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/* First argument is module name, rest are parameters */
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add_probe(argv[0]);
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G.cmdline_mopts = parse_cmdline_module_options(argv);
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}
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/* Happens if all requested modules are already loaded */
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if (G.probes == NULL)
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return EXIT_SUCCESS;
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read_config("/etc/modprobe.conf");
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read_config("/etc/modprobe.d");
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if (ENABLE_FEATURE_MODUTILS_SYMBOLS && G.need_symbols)
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read_config("modules.symbols");
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load_modules_dep();
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if (ENABLE_FEATURE_MODUTILS_ALIAS && G.num_deps) {
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if (ENABLE_FEATURE_MODUTILS_ALIAS && G.num_unresolved_deps) {
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read_config("modules.alias");
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load_modules_dep();
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}
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while ((me = llist_pop(&G.probes)) != NULL) {
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if (me->aliases == NULL) {
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/* Try if module by literal name is found; literal
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* names are blacklisted only if '-b' is given. */
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if (me->realnames == NULL) {
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/* This is not an alias. Literal names are blacklisted
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* only if '-b' is given.
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*/
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if (!(opt & MODPROBE_OPT_BLACKLIST)
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|| !(me->flags & MODULE_FLAG_BLACKLISTED)
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) {
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rc = do_modprobe(me);
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//FIXME: what if rc > 0?
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if (rc < 0 && !(opt & INSMOD_OPT_SILENT))
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bb_error_msg("module %s not found",
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me->probed_name);
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}
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} else {
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/* Probe all aliases */
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/* Probe all realnames */
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do {
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char *realname = llist_pop(&me->aliases);
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char *realname = llist_pop(&me->realnames);
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struct module_entry *m2;
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DBG("probing %s by realname %s", me->modname, realname);
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m2 = get_or_add_modentry(realname);
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if (!(m2->flags & MODULE_FLAG_BLACKLISTED))
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do_modprobe(m2);
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//FIXME: error check?
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free(realname);
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} while (me->aliases != NULL);
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} while (me->realnames != NULL);
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}
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}
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Reference in New Issue
Block a user