modprobe-small: preparatory patch for modprobe.dep.bb creation patches,
Code size impact ~0.
This commit is contained in:
Denis Vlasenko
parent
f62ab2d774
commit
24a131ea4d
@ -14,14 +14,17 @@
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#include <sys/utsname.h> /* uname() */
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#include <fnmatch.h>
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extern int init_module(void *module, unsigned long len, const char *options);
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extern int delete_module(const char *module, unsigned flags);
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extern int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret);
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#define dbg1_error_msg(...) ((void)0)
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#define dbg2_error_msg(...) ((void)0)
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//#define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
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//#define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
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extern int init_module(void *module, unsigned long len, const char *options);
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extern int delete_module(const char *module, unsigned flags);
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extern int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret);
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#define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb"
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enum {
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OPT_q = (1 << 0), /* be quiet */
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@ -63,6 +66,12 @@ static void appendc(char c)
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stringbuf[stringbuf_idx++] = c;
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}
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static void bksp(void)
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{
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if (stringbuf_idx)
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stringbuf_idx--;
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}
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static void append(const char *s)
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{
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size_t len = strlen(s);
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@ -115,6 +124,19 @@ static void replace(char *s, char what, char with)
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}
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}
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/* Take "word word", return malloced "word",NUL,"word",NUL,NUL */
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static char* str_2_list(const char *str)
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{
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int len = strlen(str) + 1;
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char *dst = xmalloc(len + 1);
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dst[len] = '\0';
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memcpy(dst, str, len);
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//TODO: protect against 2+ spaces: "word word"
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replace(dst, ' ', '\0');
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return dst;
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}
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#if ENABLE_FEATURE_MODPROBE_SMALL_ZIPPED
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static char *xmalloc_open_zipped_read_close(const char *fname, size_t *sizep)
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{
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@ -187,13 +209,13 @@ static int load_module(const char *fname, const char *options)
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#endif
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}
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static char* parse_module(const char *pathname, const char *name)
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static char* parse_module(const char *pathname)
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{
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char *module_image;
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char *ptr;
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size_t len;
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size_t pos;
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dbg1_error_msg("parse_module('%s','%s')", pathname, name);
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dbg1_error_msg("parse_module('%s')", pathname);
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/* Read (possibly compressed) module */
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len = 64 * 1024 * 1024; /* 64 Mb at most */
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@ -202,11 +224,7 @@ static char* parse_module(const char *pathname, const char *name)
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reset_stringbuf();
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/* First desc line's format is
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* "modname alias1 symbol:sym1 alias2 symbol:sym2 " (note trailing ' ')
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*/
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append(name);
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appendc(' ');
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/* Aliases */
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* "alias1 symbol:sym1 alias2 symbol:sym2" */
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pos = 0;
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while (1) {
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ptr = find_keyword(module_image + pos, len - pos, "alias=");
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@ -217,19 +235,20 @@ static char* parse_module(const char *pathname, const char *name)
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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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dbg2_error_msg("alias: 'symbol:%s'", ptr);
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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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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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pos = (ptr - module_image);
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}
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bksp(); /* remove last ' ' */
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appendc('\0');
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/* Second line: "dependency1 depandency2 " (note trailing ' ') */
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/* Second line: "dependency1 depandency2" */
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ptr = find_keyword(module_image, len, "depends=");
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if (ptr && *ptr) {
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replace(ptr, ',', ' ');
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@ -237,28 +256,31 @@ static char* parse_module(const char *pathname, const char *name)
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dbg2_error_msg("dep:'%s'", ptr);
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append(ptr);
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}
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appendc(' '); appendc('\0');
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appendc('\0');
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free(module_image);
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return copy_stringbuf();
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}
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static char* pathname_2_modname(const char *pathname)
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static int pathname_matches_modname(const char *pathname, const char *modname)
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{
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const char *fname = bb_get_last_path_component_nostrip(pathname);
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const char *suffix = strrstr(fname, ".ko");
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//TODO: can do without malloc?
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char *name = xstrndup(fname, suffix - fname);
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int r;
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replace(name, '-', '_');
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return name;
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r = (strcmp(name, modname) == 0);
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free(name);
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return r;
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}
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static FAST_FUNC int fileAction(const char *pathname,
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struct stat *sb UNUSED_PARAM,
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void *data,
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void *modname_to_match,
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int depth UNUSED_PARAM)
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{
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int cur;
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char *name;
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const char *fname;
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pathname += 2; /* skip "./" */
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@ -270,21 +292,20 @@ static FAST_FUNC int fileAction(const char *pathname,
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cur = module_count++;
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modinfo = xrealloc_vector(modinfo, 12, cur);
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//TODO: use zeroing version of xrealloc_vector?
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modinfo[cur].pathname = xstrdup(pathname);
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modinfo[cur].desc = NULL;
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modinfo[cur+1].pathname = NULL;
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modinfo[cur+1].desc = NULL;
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name = pathname_2_modname(fname);
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if (strcmp(name, data) != 0) {
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free(name);
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if (!pathname_matches_modname(fname, modname_to_match)) {
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dbg1_error_msg("'%s' module name doesn't match", pathname);
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return TRUE; /* module name doesn't match, continue search */
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}
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dbg1_error_msg("'%s' module name matches", pathname);
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module_found_idx = cur;
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modinfo[cur].desc = parse_module(pathname, name);
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modinfo[cur].desc = parse_module(pathname);
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if (!(option_mask32 & OPT_r)) {
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if (load_module(pathname, module_load_options) == 0) {
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@ -292,11 +313,9 @@ static FAST_FUNC int fileAction(const char *pathname,
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* This can happen ONLY for "top-level" module load,
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* not a dep, because deps dont do dirscan. */
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exit(EXIT_SUCCESS);
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/*free(name);return RECURSE_RESULT_ABORT;*/
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}
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}
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free(name);
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return TRUE;
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}
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@ -308,16 +327,13 @@ static module_info* find_alias(const char *alias)
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/* First try to find by name (cheaper) */
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i = 0;
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while (modinfo[i].pathname) {
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char *name = pathname_2_modname(modinfo[i].pathname);
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if (strcmp(name, alias) == 0) {
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if (pathname_matches_modname(modinfo[i].pathname, alias)) {
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dbg1_error_msg("found '%s' in module '%s'",
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alias, modinfo[i].pathname);
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if (!modinfo[i].desc)
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modinfo[i].desc = parse_module(modinfo[i].pathname, name);
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free(name);
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modinfo[i].desc = parse_module(modinfo[i].pathname);
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return &modinfo[i];
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}
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free(name);
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i++;
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}
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@ -326,16 +342,13 @@ static module_info* find_alias(const char *alias)
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while (modinfo[i].pathname) {
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char *desc, *s;
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if (!modinfo[i].desc) {
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char *name = pathname_2_modname(modinfo[i].pathname);
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modinfo[i].desc = parse_module(modinfo[i].pathname, name);
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free(name);
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modinfo[i].desc = parse_module(modinfo[i].pathname);
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}
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/* "modname alias1 symbol:sym1 alias2 symbol:sym2 " */
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desc = xstrdup(modinfo[i].desc);
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/* "alias1 symbol:sym1 alias2 symbol:sym2" */
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desc = str_2_list(modinfo[i].desc);
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/* Does matching substring exist? */
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replace(desc, ' ', '\0');
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for (s = desc; *s; s += strlen(s) + 1) {
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/* aliases in module bodies can be defined with
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/* Aliases in module bodies can be defined with
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* shell patterns. Example:
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* "pci:v000010DEd000000D9sv*sd*bc*sc*i*".
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* Plain strcmp() won't catch that */
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@ -463,10 +476,8 @@ static void process_module(char *name, const char *cmdline_options)
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}
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/* Second line of desc contains dependencies */
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deps = xstrdup(info->desc + strlen(info->desc) + 1);
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deps = str_2_list(info->desc + strlen(info->desc) + 1);
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/* Transform deps to string list */
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replace(deps, ' ', '\0');
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/* Iterate thru dependencies, trying to (un)load them */
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for (s = deps; *s; s += strlen(s) + 1) {
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//if (strcmp(name, s) != 0) // N.B. do loops exist?
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@ -481,12 +492,12 @@ static void process_module(char *name, const char *cmdline_options)
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errno = 0;
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if (load_module(info->pathname, options) != 0) {
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if (EEXIST != errno) {
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bb_error_msg("insert '%s' %s: %s",
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info->pathname, options,
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bb_error_msg("'%s': %s",
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info->pathname,
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moderror(errno));
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} else {
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dbg1_error_msg("insert '%s' %s: %s",
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info->pathname, options,
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dbg1_error_msg("'%s': %s",
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info->pathname,
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moderror(errno));
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}
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}
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