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modprobe-small: make depmod compatible with kernel build.
three last commits' sizes combined: function old new delta find_alias 218 612 +394 load_dep_bb - 310 +310 modprobe_main 289 380 +91 copy_stringbuf - 40 +40 process_module 637 655 +18 reset_stringbuf - 15 +15 parse_module 333 334 +1 append 84 85 +1 fileAction 832 819 -13 ------------------------------------------------------------------------------ (add/remove: 3/0 grow/shrink: 5/1 up/down: 870/-13) Total: 857 bytes
This commit is contained in:
Denis Vlasenko
parent
7f950a93ff
commit
0e2c93fc0b
@ -11,23 +11,31 @@ config MODPROBE_SMALL
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help
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Simplified modutils.
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With this option modprobe does not use or require
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modules.dep or /etc/modules.conf files.
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With this option modprobe does not require modules.dep file
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and does not use /etc/modules.conf file.
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It scans module files in /lib/modules/`uname -r` and
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determines dependencies and module alias names on the fly.
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This may make module loading slower, most notably
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when one needs to load module by alias (this requires
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scanning through module _bodies_).
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At the first attempt to load a module by alias modprobe
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will try to generate modules.dep.bb file in order to speed up
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future loads by alias. Failure to do so (read-only /lib/modules,
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etc) is not reported, and future modprobes will be slow too.
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NB: modules.dep.bb file format is not compatible
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with modules.dep file as created/used by standard module tools.
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Additional module parameters can be stored in
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/etc/modules/$module_name files.
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Apart from modprobe, other utilities are also provided:
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- insmod is an alias to modprobe
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- rmmod is an alias to modprobe -r
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- depmod is provided but does nothing
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- depmod generates modules.dep.bb
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As of 2008-07, this code is experimental. It it 15kb smaller
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As of 2008-07, this code is experimental. It it 14kb smaller
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than "non-small" modutils.
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config FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
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@ -44,6 +44,7 @@ struct globals {
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module_info *modinfo;
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char *module_load_options;
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smallint dep_bb_seen;
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smallint wrote_dep_bb_ok;
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int module_count;
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int module_found_idx;
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int stringbuf_idx;
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@ -53,6 +54,7 @@ struct globals {
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#define G (*ptr_to_globals)
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#define modinfo (G.modinfo )
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#define dep_bb_seen (G.dep_bb_seen )
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#define wrote_dep_bb_ok (G.wrote_dep_bb_ok )
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#define module_count (G.module_count )
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#define module_found_idx (G.module_found_idx )
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#define module_load_options (G.module_load_options)
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@ -236,15 +238,16 @@ static void parse_module(module_info *info, const char *pathname)
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break;
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/* DOCME: __ksymtab_gpl and __ksymtab_strings occur
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* in many modules. What do they mean? */
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if (strcmp(ptr, "gpl") != 0 && strcmp(ptr, "strings") != 0) {
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if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0)
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goto skip;
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dbg2_error_msg("alias:'symbol:%s'", ptr);
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append("symbol:");
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}
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} else {
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dbg2_error_msg("alias:'%s'", ptr);
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}
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append(ptr);
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appendc(' ');
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skip:
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pos = (ptr - module_image);
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}
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bksp(); /* remove last ' ' */
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@ -379,6 +382,10 @@ static int start_dep_bb_writeout(void)
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{
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int fd;
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/* depmod -n: write result to stdout */
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if (applet_name[0] == 'd' && (option_mask32 & 1))
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return STDOUT_FILENO;
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fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644);
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if (fd < 0) {
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if (errno == EEXIST) {
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@ -421,13 +428,19 @@ static void write_out_dep_bb(int fd)
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}
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/* Badly formatted depfile is a no-no. Be paranoid. */
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errno = 0;
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if (ferror(fp) | fclose(fp))
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if (ferror(fp) | fclose(fp)) /* | instead of || is intended */
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goto err;
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if (fd == STDOUT_FILENO) /* it was depmod -n */
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goto ok;
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if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) {
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err:
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bb_perror_msg("can't create %s", DEPFILE_BB);
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unlink(DEPFILE_BB".new");
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} else {
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ok:
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wrote_dep_bb_ok = 1;
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dbg1_error_msg("created "DEPFILE_BB);
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}
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}
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@ -525,8 +538,10 @@ static int already_loaded(const char *name)
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#endif
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/*
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Given modules definition and module name (or alias, or symbol)
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load/remove the module respecting dependencies
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* Given modules definition and module name (or alias, or symbol)
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* load/remove the module respecting dependencies.
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* NB: also called by depmod with bogus name "/",
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* just in order to force modprobe.dep.bb creation.
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*/
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#if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
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#define process_module(a,b) process_module(a)
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@ -605,7 +620,9 @@ static void process_module(char *name, const char *cmdline_options)
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* will try to remove them, too." */
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}
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if (!info) { /* both dirscan and find_alias found nothing */
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if (!info) {
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/* both dirscan and find_alias found nothing */
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if (applet_name[0] != 'd') /* it wasn't depmod */
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bb_error_msg("module '%s' not found", name);
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//TODO: _and_die()?
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goto ret;
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@ -644,34 +661,46 @@ static void process_module(char *name, const char *cmdline_options)
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#undef cmdline_options
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/* For reference, module-init-tools-0.9.15-pre2 options:
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/* For reference, module-init-tools v3.4 options:
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# insmod
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Usage: insmod filename [args]
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# rmmod --help
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Usage: rmmod [-fhswvV] modulename ...
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-f (or --force) forces a module unload, and may crash your machine.
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-f (or --force) forces a module unload, and may crash your
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machine. This requires the Forced Module Removal option
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when the kernel was compiled.
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-h (or --help) prints this help text
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-s (or --syslog) says use syslog, not stderr
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-v (or --verbose) enables more messages
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-V (or --version) prints the version code
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-w (or --wait) begins a module removal even if it is used
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and will stop new users from accessing the module (so it
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should eventually fall to zero).
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# modprobe
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Usage: modprobe [--verbose|--version|--config|--remove] filename [options]
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Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b]
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[-o <modname>] [ --dump-modversions ] <modname> [parameters...]
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modprobe -r [-n] [-i] [-v] <modulename> ...
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modprobe -l -t <dirname> [ -a <modulename> ...]
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# depmod --help
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depmod 0.9.15-pre2 -- part of module-init-tools
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depmod -[aA] [-n -e -v -q -V -r -u] [-b basedirectory] [forced_version]
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depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.o module2.o ...
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If no arguments (except options) are given, "depmod -a" is assumed
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depmod 3.4 -- part of module-init-tools
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depmod -[aA] [-n -e -v -q -V -r -u]
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[-b basedirectory] [forced_version]
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depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ...
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If no arguments (except options) are given, "depmod -a" is assumed.
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depmod will output a dependancy list suitable for the modprobe utility.
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Options:
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-a, --all Probe all modules
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-A, --quick Only does the work if there's a new module
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-n, --show Write the dependency file on stdout only
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-e, --errsyms Report not supplied symbols
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-V, --version Print the release version
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-v, --verbose Enable verbose mode
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-h, --help Print this usage message
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The following options are useful for people managing distributions:
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-b basedirectory
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--basedir basedirectory Use an image of a module tree.
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-F kernelsyms
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@ -686,10 +715,6 @@ int modprobe_main(int argc UNUSED_PARAM, char **argv)
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char applet0 = applet_name[0];
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USE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;)
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/* depmod is a stub */
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if ('d' == applet0)
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return EXIT_SUCCESS;
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/* are we lsmod? -> just dump /proc/modules */
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if ('l' == applet0) {
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xprint_and_close_file(xfopen("/proc/modules", "r"));
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@ -698,6 +723,45 @@ int modprobe_main(int argc UNUSED_PARAM, char **argv)
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INIT_G();
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/* Prevent ugly corner cases with no modules at all */
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modinfo = xzalloc(sizeof(modinfo[0]));
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/* Goto modules directory */
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xchdir(CONFIG_DEFAULT_MODULES_DIR);
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uname(&uts); /* never fails */
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/* depmod? */
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if ('d' == applet0) {
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/* Supported:
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* -n: print result to stdout
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* -a: process all modules (default)
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* optional VERSION parameter
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* Ignored:
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* -A: do work only if a module is newer than depfile
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* -e: report any symbols which a module needs
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* which are not supplied by other modules or the kernel
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* -F FILE: System.map (symbols for -e)
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* -q, -r, -u: noop?
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* Not supported:
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* -b BASEDIR: (TODO!) modules are in
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* $BASEDIR/lib/modules/$VERSION
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* -v: human readable deps to stdout
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* -V: version (don't want to support it - people may depend
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* on it as an indicator of "standard" depmod)
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* -h: help (well duh)
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* module1.o module2.o parameters (just ignored for now)
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*/
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getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL);
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argv += optind;
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/* if (argv[0] && argv[1]) bb_show_usage(); */
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/* Goto $VERSION directory */
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xchdir(argv[0] ? argv[0] : uts.release);
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/* Force full module scan by asking to find a bogus module.
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* This will generate modules.dep.bb as a side effect. */
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process_module((char*)"/", NULL);
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return !wrote_dep_bb_ok;
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}
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/* insmod, modprobe, rmmod require at least one argument */
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opt_complementary = "-1";
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/* only -q (quiet) and -r (rmmod),
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@ -710,9 +774,7 @@ int modprobe_main(int argc UNUSED_PARAM, char **argv)
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option_mask32 |= OPT_r;
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}
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/* goto modules directory */
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xchdir(CONFIG_DEFAULT_MODULES_DIR);
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uname(&uts); /* never fails */
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/* Goto $VERSION directory */
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xchdir(uts.release);
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#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
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@ -734,9 +796,6 @@ int modprobe_main(int argc UNUSED_PARAM, char **argv)
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argv[1] = NULL;
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#endif
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/* Prevent ugly corner cases with no modules at all */
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modinfo = xzalloc(sizeof(modinfo[0]));
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/* Try to load modprobe.dep.bb */
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load_dep_bb();
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