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create udevdb files only if somehting interesting happened

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Device nodes created with the default rule, without any symlink or option
are no longer saved to the udevdb. This saves us ~3 MB RAM for pretty much
useless files on tmpfs.
Note: HAL needs a fix to handle this correctly. It's already available on
the list.

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
This commit is contained in:
Kay Sievers 2005-07-05 22:40:42 +02:00
parent 8bd41f36f7
commit 25103c4849
2 changed files with 25 additions and 15 deletions
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19
udev_db.c
View File

@ -68,10 +68,18 @@ int udev_db_add_device(struct udevice *udev)
if (udev->test_run)
return 0;
/* don't write anything if udev created only the node with the
* kernel name without any interesting data to remember
*/
if (strcmp(udev->name, udev->kernel_name) == 0 &&
list_empty(&udev->symlink_list) && list_empty(&udev->env_list) &&
!udev->partitions && !udev->ignore_remove) {
dbg("nothing interesting to store in udevdb, skip");
goto exit;
}
get_db_filename(udev->devpath, filename, sizeof(filename));
create_path(filename);
f = fopen(filename, "w");
if (f == NULL) {
err("unable to create db file '%s'", filename);
@ -84,12 +92,15 @@ int udev_db_add_device(struct udevice *udev)
list_for_each_entry(name_loop, &udev->symlink_list, node)
fprintf(f, "S:%s\n", name_loop->name);
fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt));
fprintf(f, "A:%u\n", udev->partitions);
fprintf(f, "R:%u\n", udev->ignore_remove);
if (udev->partitions)
fprintf(f, "A:%u\n", udev->partitions);
if (udev->ignore_remove)
fprintf(f, "R:%u\n", udev->ignore_remove);
list_for_each_entry(name_loop, &udev->env_list, node)
fprintf(f, "E:%s\n", name_loop->name);
fclose(f);
exit:
return 0;
}

21
udev_remove.c
View File

@ -143,18 +143,17 @@ int udev_remove_device(struct udevice *udev)
if (udev->type != DEV_BLOCK && udev->type != DEV_CLASS)
return 0;
/* remove node only if we can find it in our database */
if (udev_db_get_device(udev, udev->devpath) != 0) {
dbg("'%s' not found in database, ignore event", udev->name);
return -1;
if (udev_db_get_device(udev, udev->devpath) == 0) {
if (udev->ignore_remove) {
dbg("remove event for '%s' requested to be ignored by rule", udev->name);
return 0;
}
dbg("remove name='%s'", udev->name);
udev_db_delete_device(udev);
} else {
dbg("'%s' not found in database, using kernel name '%s'", udev->devpath, udev->kernel_name);
strlcpy(udev->name, udev->kernel_name, sizeof(udev->name));
}
if (udev->ignore_remove) {
dbg("remove event for '%s' requested to be ignored by rule", udev->name);
return 0;
}
dbg("remove name='%s'", udev->name);
udev_db_delete_device(udev);
/* use full path to the environment */
snprintf(udev->devname, sizeof(udev->devname), "%s/%s", udev_root, udev->name);
udev->devname[sizeof(udev->devname)-1] = '\0';