udevtrigger: trigger devices sorted by their dependency
Resolve the links to the real device location in the tree, and sort the list, to make sure that parent devices are triggered before their childs.
This commit is contained in:
Kay Sievers
+64
-93
@@ -34,6 +34,14 @@
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#include "udev.h"
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#include "udevd.h"
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static int verbose;
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static int dry_run;
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LIST_HEAD(device_list);
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LIST_HEAD(filter_subsystem_match_list);
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LIST_HEAD(filter_subsystem_nomatch_list);
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LIST_HEAD(filter_attr_match_list);
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LIST_HEAD(filter_attr_nomatch_list);
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#ifdef USE_LOG
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void log_message(int priority, const char *format, ...)
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{
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@@ -48,69 +56,62 @@ void log_message(int priority, const char *format, ...)
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}
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#endif
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static int verbose;
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static int dry_run;
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/* list of devices that we should run last due to any one of a number of reasons */
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static char *last_list[] = {
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"/class/block/md",
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"/class/block/dm-",
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"/block/md",
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"/block/dm-",
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NULL
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};
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/* list of devices that we should run first due to any one of a number of reasons */
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static char *first_list[] = {
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"/class/mem",
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"/class/tty",
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NULL
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};
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LIST_HEAD(device_first_list);
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LIST_HEAD(device_default_list);
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LIST_HEAD(device_last_list);
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LIST_HEAD(filter_subsystem_match_list);
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LIST_HEAD(filter_subsystem_nomatch_list);
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LIST_HEAD(filter_attr_match_list);
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LIST_HEAD(filter_attr_nomatch_list);
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static int device_list_insert(const char *path)
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/* devices that should run last cause of their dependencies */
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static int delay_device(const char *devpath)
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{
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struct list_head *device_list = &device_default_list;
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const char *devpath = &path[strlen(sysfs_path)];
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static const char *delay_device_list[] = {
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"*/md*",
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"*/dm-*",
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NULL
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};
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int i;
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for (i = 0; first_list[i] != NULL; i++) {
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if (strncmp(devpath, first_list[i], strlen(first_list[i])) == 0) {
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device_list = &device_first_list;
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break;
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}
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}
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for (i = 0; last_list[i] != NULL; i++) {
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if (strncmp(devpath, last_list[i], strlen(last_list[i])) == 0) {
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device_list = &device_last_list;
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break;
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}
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}
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dbg("add '%s'" , path);
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/* double entries will be ignored */
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name_list_add(device_list, path, 0);
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for (i = 0; delay_device_list[i] != NULL; i++)
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if (fnmatch(delay_device_list[i], devpath, 0) == 0)
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return 1;
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return 0;
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}
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static void trigger_uevent(const char *path)
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static int device_list_insert(const char *path)
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{
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char filename[PATH_SIZE];
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char devpath[PATH_SIZE];
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struct stat statbuf;
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dbg("add '%s'" , path);
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/* we only have a device, if we have an uevent file */
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strlcpy(filename, path, sizeof(filename));
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strlcat(filename, "/uevent", sizeof(filename));
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if (stat(filename, &statbuf) < 0)
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return -1;
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if (!(statbuf.st_mode & S_IWUSR))
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return -1;
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strlcpy(devpath, &path[strlen(sysfs_path)], sizeof(devpath));
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/* resolve possible link to real target */
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if (lstat(path, &statbuf) < 0)
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return -1;
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if (S_ISLNK(statbuf.st_mode))
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if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
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return -1;
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name_list_add(&device_list, devpath, 1);
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return 0;
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}
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static void trigger_uevent(const char *devpath)
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{
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char filename[PATH_SIZE];
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int fd;
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strlcpy(filename, path, sizeof(filename));
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strlcpy(filename, sysfs_path, sizeof(filename));
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strlcat(filename, devpath, sizeof(filename));
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strlcat(filename, "/uevent", sizeof(filename));
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if (verbose)
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printf("%s\n", path);
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printf("%s\n", devpath);
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if (dry_run)
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return;
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@@ -127,48 +128,26 @@ static void trigger_uevent(const char *path)
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close(fd);
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}
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static void exec_lists(void)
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static void exec_list(void)
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{
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struct name_entry *loop_device;
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struct name_entry *tmp_device;
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/* handle the devices on the "first" list first */
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list_for_each_entry_safe(loop_device, tmp_device, &device_first_list, node) {
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list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
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if (delay_device(loop_device->name))
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continue;
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trigger_uevent(loop_device->name);
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list_del(&loop_device->node);
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free(loop_device);
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}
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/* handle the devices on the "default" list next */
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list_for_each_entry_safe(loop_device, tmp_device, &device_default_list, node) {
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/* trigger remaining delayed devices */
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list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
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trigger_uevent(loop_device->name);
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list_del(&loop_device->node);
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free(loop_device);
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}
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/* handle devices on the "last" list, if any */
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list_for_each_entry_safe(loop_device, tmp_device, &device_last_list, node) {
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trigger_uevent(loop_device->name);
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list_del(&loop_device->node);
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free(loop_device);
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}
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}
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static int is_device(const char *path)
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{
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char filename[PATH_SIZE];
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struct stat statbuf;
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/* look for the uevent file of the kobject */
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strlcpy(filename, path, sizeof(filename));
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strlcat(filename, "/uevent", sizeof(filename));
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if (stat(filename, &statbuf) < 0)
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return 0;
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if (!(statbuf.st_mode & S_IWUSR))
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return 0;
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return 1;
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}
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static int subsystem_filtered(const char *subsystem)
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@@ -299,8 +278,7 @@ static void scan_bus(void)
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strlcat(dirname2, dent2->d_name, sizeof(dirname2));
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if (attr_filtered(dirname2))
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continue;
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if (is_device(dirname2))
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device_list_insert(dirname2);
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device_list_insert(dirname2);
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}
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closedir(dir2);
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}
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@@ -343,9 +321,7 @@ static void scan_block(void)
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strlcat(dirname, dent->d_name, sizeof(dirname));
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if (attr_filtered(dirname))
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continue;
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if (is_device(dirname))
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device_list_insert(dirname);
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else
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if (device_list_insert(dirname) != 0);
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continue;
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/* look for partitions */
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@@ -365,8 +341,7 @@ static void scan_block(void)
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strlcat(dirname2, dent2->d_name, sizeof(dirname2));
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if (attr_filtered(dirname2))
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continue;
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if (is_device(dirname2))
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device_list_insert(dirname2);
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device_list_insert(dirname2);
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}
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closedir(dir2);
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}
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@@ -416,8 +391,7 @@ static void scan_class(void)
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strlcat(dirname2, dent2->d_name, sizeof(dirname2));
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if (attr_filtered(dirname2))
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continue;
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if (is_device(dirname2))
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device_list_insert(dirname2);
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device_list_insert(dirname2);
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}
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closedir(dir2);
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}
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@@ -455,10 +429,7 @@ static void scan_failed(void)
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if (device[i] == PATH_TO_NAME_CHAR)
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device[i] = '/';
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if (is_device(device))
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device_list_insert(device);
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else
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continue;
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device_list_insert(device);
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}
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closedir(dir);
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}
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@@ -539,7 +510,7 @@ int main(int argc, char *argv[], char *envp[])
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scan_class();
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scan_block();
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}
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exec_lists();
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exec_list();
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exit:
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name_list_cleanup(&filter_subsystem_match_list);
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