From: Kay Sievers <kay.sievers@vrfy.org>
Date: Mon, 16 May 2011 17:13:42 +0000 (+0200)
Subject: libudev: queue - always rebuild queue file when nothing is queued anymore
X-Git-Tag: 174~142
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=4b718be86db37a37c83793ca410e8d9968e615f2;ds=sidebyside

libudev: queue - always rebuild queue file when nothing is queued anymore
---

diff --git a/Makefile.am b/Makefile.am
index 651a15455..0a340aa39 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -36,7 +36,7 @@ dist_libexec_SCRIPTS =
 # libudev
 # ------------------------------------------------------------------------------
 LIBUDEV_CURRENT=11
-LIBUDEV_REVISION=3
+LIBUDEV_REVISION=4
 LIBUDEV_AGE=11
 
 SUBDIRS += libudev/docs
diff --git a/libudev/libudev-queue-private.c b/libudev/libudev-queue-private.c
index a799be062..0dcf9b002 100644
--- a/libudev/libudev-queue-private.c
+++ b/libudev/libudev-queue-private.c
@@ -164,7 +164,7 @@ static struct queue_devpaths *build_index(struct udev_queue_export *udev_queue_e
 	devpaths->devpaths_size = range + 1;
 
 	/* read all records and populate the table */
-	while(1) {
+	for (;;) {
 		if (udev_queue_read_seqnum(udev_queue_export->queue_file, &seqnum) < 0)
 			break;
 		n = seqnum - udev_queue_export->seqnum_max;
@@ -303,8 +303,10 @@ static int write_queue_record(struct udev_queue_export *udev_queue_export,
 	len = (devpath_len < USHRT_MAX) ? devpath_len : USHRT_MAX;
 	if (fwrite(&len, sizeof(unsigned short), 1, udev_queue_export->queue_file) != 1)
 		goto write_error;
-	if (fwrite(devpath, 1, len, udev_queue_export->queue_file) != len)
-		goto write_error;
+	if (len > 0) {
+		if (fwrite(devpath, 1, len, udev_queue_export->queue_file) != len)
+			goto write_error;
+	}
 
 	/* *must* flush output; caller may fork */
 	if (fflush(udev_queue_export->queue_file) != 0)
@@ -342,6 +344,7 @@ static int update_queue(struct udev_queue_export *udev_queue_export,
 	int bytes;
 	int err;
 
+	/* FINISHED records have a zero length devpath */
 	if (state == DEVICE_QUEUED) {
 		devpath = udev_device_get_devpath(udev_device);
 		devpath_len = strlen(devpath);
@@ -353,12 +356,9 @@ static int update_queue(struct udev_queue_export *udev_queue_export,
 			return -1;
 	}
 
-	/* when the queue file grows too large, garbage-collect and rebuild it */
-	bytes = ftell(udev_queue_export->queue_file) + queue_record_size(devpath_len);
-
 	/* if we're removing the last event from the queue, that's the best time to rebuild it */
-	if (state != DEVICE_QUEUED && udev_queue_export->queued_count == 1 && bytes > 2048) {
-		/* because we don't need to read the old queue file */
+	if (state != DEVICE_QUEUED && udev_queue_export->queued_count == 1) {
+		/* we don't need to read the old queue file */
 		fclose(udev_queue_export->queue_file);
 		udev_queue_export->queue_file = NULL;
 		rebuild_queue_file(udev_queue_export);
@@ -366,6 +366,7 @@ static int update_queue(struct udev_queue_export *udev_queue_export,
 	}
 
 	/* try to rebuild the queue files before they grow larger than one page. */
+	bytes = ftell(udev_queue_export->queue_file) + queue_record_size(devpath_len);
 	if ((udev_queue_export->waste_bytes > bytes / 2) && bytes > 4096)
 		rebuild_queue_file(udev_queue_export);
 
diff --git a/udev/udevadm-settle.c b/udev/udevadm-settle.c
index 9492abd40..b717ae60d 100644
--- a/udev/udevadm-settle.c
+++ b/udev/udevadm-settle.c
@@ -153,7 +153,7 @@ int udevadm_settle(struct udev *udev, int argc, char *argv[])
 	if (pfd[0].fd < 0) {
 		err(udev, "inotify_init failed: %m\n");
 	} else {
-		if (inotify_add_watch(pfd[0].fd, udev_get_run_path(udev), IN_CLOSE_WRITE) < 0) {
+		if (inotify_add_watch(pfd[0].fd, udev_get_run_path(udev), IN_MOVED_TO) < 0) {
 			err(udev, "watching '%s' failed\n", udev_get_run_path(udev));
 			close(pfd[0].fd);
 			pfd[0].fd = -1;