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-rw-r--r--tools/modprobe.c144
1 files changed, 104 insertions, 40 deletions
diff --git a/tools/modprobe.c b/tools/modprobe.c
index 9387537..2a2ae21 100644
--- a/tools/modprobe.c
+++ b/tools/modprobe.c
@@ -32,6 +32,7 @@
#include <sys/wait.h>
#include <shared/array.h>
+#include <shared/util.h>
#include <shared/macro.h>
#include <libkmod/libkmod.h>
@@ -54,14 +55,19 @@ static int use_blacklist = 0;
static int force = 0;
static int strip_modversion = 0;
static int strip_vermagic = 0;
-static int remove_dependencies = 0;
+static int remove_holders = 0;
+static unsigned long long wait_msec = 0;
static int quiet_inuse = 0;
-static const char cmdopts_s[] = "arRibfDcnC:d:S:sqvVh";
+static const char cmdopts_s[] = "arw:RibfDcnC:d:S:sqvVh";
static const struct option cmdopts[] = {
{"all", no_argument, 0, 'a'},
+
{"remove", no_argument, 0, 'r'},
{"remove-dependencies", no_argument, 0, 5},
+ {"remove-holders", no_argument, 0, 5},
+ {"wait", required_argument, 0, 'w'},
+
{"resolve-alias", no_argument, 0, 'R'},
{"first-time", no_argument, 0, 3},
{"ignore-install", no_argument, 0, 'i'},
@@ -107,8 +113,11 @@ static void help(void)
"\t be a module name to be inserted\n"
"\t or removed (-r)\n"
"\t-r, --remove Remove modules instead of inserting\n"
- "\t --remove-dependencies Also remove modules depending on it\n"
- "\t-R, --resolve-alias Only lookup and print alias and exit\n"
+ "\t --remove-dependencies Deprecated: use --remove-holders\n"
+ "\t --remove-holders Also remove module holders (use together with -r)\n"
+ "\t-w, --wait <MSEC> When removing a module, wait up to MSEC for\n"
+ "\t module's refcount to become 0 so it can be\n"
+ "\t removed (use together with -r)\n"
"\t --first-time Fail if module already inserted or removed\n"
"\t-i, --ignore-install Ignore install commands\n"
"\t-i, --ignore-remove Ignore remove commands\n"
@@ -120,6 +129,7 @@ static void help(void)
"\t --force-vermagic Ignore module's version magic\n"
"\n"
"Query Options:\n"
+ "\t-R, --resolve-alias Only lookup and print alias and exit\n"
"\t-D, --show-depends Only print module dependencies and exit\n"
"\t-c, --showconfig Print out known configuration and exit\n"
"\t-c, --show-config Same as --showconfig\n"
@@ -320,10 +330,11 @@ end:
static int rmmod_do_remove_module(struct kmod_module *mod)
{
const char *modname = kmod_module_get_name(mod);
- struct kmod_list *deps, *itr;
+ unsigned long long interval_msec = 0, t0_msec = 0,
+ tend_msec = 0;
int flags = 0, err;
- SHOW("rmmod %s\n", kmod_module_get_name(mod));
+ SHOW("rmmod %s\n", modname);
if (dry_run)
return 0;
@@ -331,33 +342,55 @@ static int rmmod_do_remove_module(struct kmod_module *mod)
if (force)
flags |= KMOD_REMOVE_FORCE;
- err = kmod_module_remove_module(mod, flags);
- if (err == -EEXIST) {
- if (!first_time)
- err = 0;
- else
- LOG("Module %s is not in kernel.\n", modname);
- }
+ if (wait_msec)
+ flags |= KMOD_REMOVE_NOLOG;
- deps = kmod_module_get_dependencies(mod);
- if (deps != NULL) {
- kmod_list_foreach(itr, deps) {
- struct kmod_module *dep = kmod_module_get_module(itr);
- if (kmod_module_get_refcnt(dep) == 0)
- rmmod_do_remove_module(dep);
- kmod_module_unref(dep);
+ do {
+ err = kmod_module_remove_module(mod, flags);
+ if (err == -EEXIST) {
+ if (!first_time)
+ err = 0;
+ else
+ LOG("Module %s is not in kernel.\n", modname);
+ break;
+ } else if (err == -EAGAIN && wait_msec) {
+ unsigned long long until_msec;
+
+ if (!t0_msec) {
+ t0_msec = now_msec();
+ tend_msec = t0_msec + wait_msec;
+ interval_msec = 1;
+ }
+
+ until_msec = get_backoff_delta_msec(t0_msec, tend_msec,
+ &interval_msec);
+ err = sleep_until_msec(until_msec);
+
+ if (!t0_msec)
+ err = -ENOTSUP;
+
+ if (err < 0) {
+ ERR("Failed to sleep: %s\n", strerror(-err));
+ err = -EAGAIN;
+ break;
+ }
+ } else {
+ break;
}
- kmod_module_unref_list(deps);
- }
+ } while (interval_msec);
+
+ if (err < 0 && wait_msec)
+ ERR("could not remove '%s': %s\n", modname, strerror(-err));
return err;
}
-#define RMMOD_FLAG_DO_DEPENDENCIES 0x1
+#define RMMOD_FLAG_REMOVE_HOLDERS 0x1
#define RMMOD_FLAG_IGNORE_BUILTIN 0x2
static int rmmod_do_module(struct kmod_module *mod, int flags);
-static int rmmod_do_deps_list(struct kmod_list *list, bool stop_on_errors)
+/* Remove modules in reverse order */
+static int rmmod_do_modlist(struct kmod_list *list, bool stop_on_errors)
{
struct kmod_list *l;
@@ -391,7 +424,8 @@ static int rmmod_do_module(struct kmod_module *mod, int flags)
cmd = kmod_module_get_remove_commands(mod);
}
- if (cmd == NULL && !ignore_loaded) {
+ /* Quick check if module is loaded, otherwise there's nothing to do */
+ if (!cmd && !ignore_loaded) {
int state = kmod_module_get_initstate(mod);
if (state < 0) {
@@ -413,17 +447,20 @@ static int rmmod_do_module(struct kmod_module *mod, int flags)
}
}
- rmmod_do_deps_list(post, false);
+ /* 1. @mod's post-softdeps in reverse order */
+ rmmod_do_modlist(post, false);
- if ((flags & RMMOD_FLAG_DO_DEPENDENCIES) && remove_dependencies) {
- struct kmod_list *deps = kmod_module_get_dependencies(mod);
+ /* 2. Other modules holding @mod */
+ if (flags & RMMOD_FLAG_REMOVE_HOLDERS) {
+ struct kmod_list *holders = kmod_module_get_holders(mod);
- err = rmmod_do_deps_list(deps, true);
+ err = rmmod_do_modlist(holders, true);
if (err < 0)
goto error;
}
- if (!ignore_loaded && !cmd) {
+ /* 3. @mod itself, but check for refcnt first */
+ if (!cmd && !ignore_loaded && !wait_msec) {
int usage = kmod_module_get_refcnt(mod);
if (usage > 0) {
@@ -435,7 +472,7 @@ static int rmmod_do_module(struct kmod_module *mod, int flags)
}
}
- if (cmd == NULL)
+ if (!cmd)
err = rmmod_do_remove_module(mod);
else
err = command_do(mod, "remove", cmd, NULL);
@@ -443,7 +480,22 @@ static int rmmod_do_module(struct kmod_module *mod, int flags)
if (err < 0)
goto error;
- rmmod_do_deps_list(pre, false);
+ /* 4. Other modules that became unused: errors are non-fatal */
+ if (!cmd) {
+ struct kmod_list *deps, *itr;
+
+ deps = kmod_module_get_dependencies(mod);
+ kmod_list_foreach(itr, deps) {
+ struct kmod_module *dep = kmod_module_get_module(itr);
+ if (kmod_module_get_refcnt(dep) == 0)
+ rmmod_do_remove_module(dep);
+ kmod_module_unref(dep);
+ }
+ kmod_module_unref_list(deps);
+ }
+
+ /* 5. @mod's pre-softdeps in reverse order: errors are non-fatal */
+ rmmod_do_modlist(pre, false);
error:
kmod_module_unref_list(pre);
@@ -468,7 +520,9 @@ static int rmmod(struct kmod_ctx *ctx, const char *alias)
kmod_list_foreach(l, list) {
struct kmod_module *mod = kmod_module_get_module(l);
- err = rmmod_do_module(mod, RMMOD_FLAG_DO_DEPENDENCIES);
+ int flags = remove_holders ? RMMOD_FLAG_REMOVE_HOLDERS : 0;
+
+ err = rmmod_do_module(mod, flags);
kmod_module_unref(mod);
if (err < 0)
break;
@@ -683,7 +737,7 @@ static int options_from_array(char **args, int nargs, char **output)
static char **prepend_options_from_env(int *p_argc, char **orig_argv)
{
const char *p, *env = getenv("MODPROBE_OPTIONS");
- char **new_argv, *str_start, *str_end, *str, *s, *quote;
+ char **new_argv, *str_end, *str, *s, *quote;
int i, argc = *p_argc;
size_t envlen, space_count = 0;
@@ -701,10 +755,10 @@ static char **prepend_options_from_env(int *p_argc, char **orig_argv)
return NULL;
new_argv[0] = orig_argv[0];
- str_start = str = (char *) (new_argv + argc + space_count + 3);
+ str = (char *) (new_argv + argc + space_count + 3);
memcpy(str, env, envlen + 1);
- str_end = str_start + envlen;
+ str_end = str + envlen;
quote = NULL;
for (i = 1, s = str; *s != '\0'; s++) {
@@ -743,7 +797,7 @@ static char **prepend_options_from_env(int *p_argc, char **orig_argv)
}
memcpy(new_argv + i, orig_argv + 1, sizeof(char *) * (argc - 1));
- new_argv[i + argc] = NULL;
+ new_argv[i + argc - 1] = NULL;
*p_argc = i + argc - 1;
return new_argv;
@@ -786,11 +840,18 @@ static int do_modprobe(int argc, char **orig_argv)
do_remove = 1;
break;
case 5:
- remove_dependencies = 1;
+ remove_holders = 1;
break;
- case 'R':
- lookup_only = 1;
+ case 'w': {
+ char *endptr = NULL;
+ wait_msec = strtoul(optarg, &endptr, 0);
+ if (!*optarg || *endptr) {
+ ERR("unexpected wait value '%s'.\n", optarg);
+ err = -1;
+ goto done;
+ }
break;
+ }
case 3:
first_time = 1;
break;
@@ -814,6 +875,9 @@ static int do_modprobe(int argc, char **orig_argv)
dry_run = 1;
do_show = 1;
break;
+ case 'R':
+ lookup_only = 1;
+ break;
case 'c':
do_show_config = 1;
break;
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-23 22:06:53 +0000